Calibration tool for small-radius large-superelevation curve

Abstract

The utility model relates to the technical field of track measurement, in particular to a calibration tool for a small-radius large-superelevation curve, which comprises a measurement cushion block, a tilt angle sensor, a measurement display module and a mounting seat capable of being clamped on the outer side of the upper part of a steel rail, and the mounting seat comprises a fixed block, a movable block and an elastic screw rod. The device is reasonable and compact in structure, the measuring display module and the adjusting mechanism for adjusting the inclination angle of the measuring cushion block can eliminate the influence of the factor that the accuracy difference value is too large after the measuring trolley is calibrated on a large superelevation curve, and the upper portion of the measuring cushion block is the same as the section of the 60-type steel rail. The mounting seat can fix the measuring cushion block on the calibration rail surface of the linear steel rail, and the inclination angle of the measuring cushion block is adjusted through the adjusting mechanism according to the designed inclination angle, so that the inclination angle of the measuring cushion block is the same as the designed inclination angle, and the actual field operation state can be simulated. After the measuring trolley is calibrated by the measuring cushion block, the operation efficiency and the operation quality of the large road maintenance machine in a large ultrahigh curve section can be greatly improved.

Description

Technical Field

[0001] This utility model relates to the field of track measurement technology and is a calibration tool for small-radius, large-superelevation curves. Background Technology

[0002] Despite multiple speed increases on railway lines, a large number of superelevation curves still exist. In the daily operation of large track maintenance machinery, superelevation curves mainly refer to those with a superelevation between 80 and 125 mm. Since there are a significant number of 100 mm superelevation curves, if the operational accuracy for these curves can be guaranteed, the required accuracy can be achieved within a superelevation range of ±25%. However, when large track maintenance machinery operates on superelevation curves, it is frequently observed that the vehicle's calibrated superelevation differs significantly from the actual value. This is primarily due to inaccurate measurements by the electronic pendulum sensor (lateral level sensor) of the tamping machine's detection system when encountering superelevation curves.

[0003] When calibrating vehicles using a standard calibration pad, it is a 30 mm × 50 mm × 100 mm metal cuboid. This standard cuboid calibration pad is suitable for vehicles with a superelevation below 60 mm. Even with slight errors within this range, it meets the accuracy requirements for actual on-site operations. However, when the superelevation exceeds 100 mm, a more precise magnification ratio is required. The detection of superelevation is significantly affected by two main factors:

[0004] Firstly, during actual operation, the detection system of large track maintenance machinery is affected by lateral loading force. The measuring wheel on one side runs in close contact with the ultra-high-strength rail, but during calibration, it is on a straight line and loading force cannot be applied to the calibration pad, resulting in a difference in the contact position between the wheel and the rail.

[0005] Secondly, the wear of the measuring wheels affects the accuracy of calibration for each vehicle model. Different operating conditions and usage times result in varying wear on the tread and wheel flange, leading to excessive errors after vehicle calibration. Observation and analysis reveal that superelevation measurement is typically performed using electronic pendulum sensors connected to measuring trolleys of different models at points B / C / D. When the measuring trolley is on a large superelevation curve, the contact relationship between the measuring wheels and the rail surface differs from that when calibrating on a straight line.

[0006] In addition, the shape of the measuring trolley varies depending on the vehicle model. For example, the contact method of the measuring trolley is different when measuring superelevation at point C for DC-32 and DCL-32 tamping machines. The actual position of the wheel tread and rail tread on a curve with large superelevation under lateral loading is also different from that on a straight line. This results in different test values ​​when the measuring trolley is loaded and unloaded during the actual testing process. The change in the actual contact surface of the measuring trolley will also cause differences in the test values ​​after calibration.

[0007] As the superelevation value increases, the impact becomes increasingly significant. Based on routine calibration results, vehicles calibrated using ordinary calibration pads exhibit errors of 3mm to 5mm on large superelevation curves, severely affecting the tamping machine's operational accuracy. To achieve more precise calibration of the tamping machine's inspection system, the calibration pads need to be redesigned and modified. Contouring pads should be created based on the actual cross-sectional shape of the rails, and angle gauges should be designed on the pads according to the actual angle position of the rails on large superelevation curves. The calibration pads should be designed to most closely approximate the actual field conditions and fixed at a specific angle to the superelevation rails to be calibrated on straight roads, minimizing factors affecting accuracy during calibration. Summary of the Invention

[0008] This invention provides a calibration fixture for small-radius, large-superelevation curves, overcoming the shortcomings of the prior art. It can effectively solve the problem of low detection accuracy of existing large-scale road maintenance machinery's measuring trolleys when encountering large-superelevation curves.

[0009] The technical solution of this utility model is achieved through the following measures: a calibration fixture for a small radius, large superelevation curve, including a measuring pad, an inclination sensor, a measuring display module, and a mounting base that can be clamped onto the outer side of the upper part of the rail. The mounting base includes a fixed block, a movable block, and a tensioning screw. The front end of the fixed block has a clamping groove that opens downwards and runs through the front and back. The inner wall of the left part of the clamping groove matches the outer side of the upper part of the rail. The upper right side of the fixed block has a sliding groove that runs vertically through the rail. The sliding groove is T-shaped, wider at the top and narrower at the bottom. A T-shaped slider with its lower side located in the clamping groove is slidably installed in the sliding groove. The lower side of the slider is aligned with the inner wall of the rail. The movable block is fixedly installed on the upper side of the clamping groove. The left side of the movable block matches the upper right side of the rail. The right side of the fixed block has a through-hole for adjusting tension. A tension screw with its left end rotatably installed with the right side of the movable block is screwed into the tension screw hole. The upper side of the fixed block has a measuring pad with the same cross section as the rail. The right side of the measuring pad and the fixed block have an adjustment mechanism that can adjust the tilt angle of the measuring pad. The upper front side of the measuring pad has a front mounting groove with an opening facing forward. An inclination sensor is fixedly installed in the front mounting groove. The inclination sensor is connected to the measurement display module.

[0010] The following are further optimizations and / or improvements to the above-mentioned utility model technical solution:

[0011] The aforementioned adjustment mechanism may include a front fixed plate, a rear fixed plate, an adjusting screw, an adjusting rod, and a hinge seat. The front fixed plate and the rear fixed plate are fixedly installed on the front left side and the rear left side of the fixed block, respectively. The front side of the front fixed plate and the front side of the rear fixed plate are provided with hinge holes that pass through from front to back. A connecting pin that is fixedly installed together with the left side of the measuring pad is rotatably installed in each hinge hole. The right side of the measuring pad is provided with an adjustment groove that opens to the right and passes through from top to bottom. An adjusting rod is rotatably installed in the adjustment groove. An adjusting screw hole that passes through from the middle of the adjusting rod is provided in the middle. A hinge seat is fixedly installed on the upper side of the fixed block corresponding to the lower left position of the adjusting rod. A connecting rod is hingedly installed in the hinge seat. A connecting block is fixedly installed on the outer side of the middle part of the connecting rod. An adjusting screw with its lower end rotatably installed together with the connecting block is screwed into the adjusting screw hole.

[0012] A front guide plate can be fixedly installed on the right front side of the fixing block corresponding to the front position of the measuring pad. The front guide plate has a front guide hole with an arc shape that opens to the left and is coaxial with the connecting pin. A front guide pin with its rear end fixedly installed together with the front side of the measuring pad is provided in the front guide hole. A rear guide plate is fixedly installed on the right rear side of the fixing block corresponding to the rear position of the measuring pad. A rear guide hole with an arc shape that opens to the left and is coaxial with the connecting pin is provided on the front side of the rear guide hole. A rear guide pin with its front end fixedly installed together with the rear side of the measuring pad is provided in the rear guide hole.

[0013] The upper right side of the aforementioned measuring pad may be provided with an upper mounting groove with an opening to the right. A first pressure sensor is fixedly installed in the upper mounting groove. The upper side of the first pressure sensor is higher than the upper surface of the measuring pad. The first pressure sensor is connected to the measuring display module.

[0014] The upper right side of the measuring pad corresponding to the above mounting slot position may be provided with an upward-facing right mounting slot. The upper part of the right mounting slot is connected to the right side of the upper mounting slot. A second pressure sensor is fixedly installed in the right mounting slot, and the second pressure sensor is connected to the measurement display module.

[0015] The distance between the right side of the second pressure sensor and the upper left side of the measuring pad can be 1 to 3 mm.

[0016] This utility model has a reasonable and compact structure. The measurement display module and the adjustment mechanism for adjusting the tilt angle of the measuring pad can eliminate the influence of excessive accuracy difference after the measuring trolley is calibrated on superelevation curves. The upper part of the measuring pad has the same cross-section as the 60-type rail (or 50-type rail, the measuring pad is made according to the actual rail cross-section). The mounting base can fix the measuring pad on the calibration rail surface of the straight rail. Since the rail of the superelevation curve has a certain design tilt angle, the tilt angle sensor is installed on the side of the measuring pad. The tilt angle of the measuring pad is adjusted according to the design tilt angle by the adjustment mechanism, so that the tilt angle of the measuring pad is the same as the design tilt angle. It can simulate the actual working state of the vehicle on the small radius superelevation curve. It can accurately realize the real state of wheel-rail contact when the superelevation is between 100mm and 125mm. After the measuring trolley is calibrated by the measuring pad, it will greatly improve the working efficiency and quality of large track maintenance machinery in the superelevation curve section, and completely solve the problem of poor leveling of large track maintenance machinery vehicles after operation in this section. Attached Figure Description

[0017] Appendix Figure 1 This is a schematic diagram of the main structure of Embodiments 1 to 4 of this utility model when in use.

[0018] Appendix Figure 2 This is a right-side view of the structure when the present utility model is in use according to embodiments one to four.

[0019] Appendix Figure 3 These are schematic diagrams of the main cross-sectional structure of embodiments one to four of this utility model.

[0020] Appendix Figure 4 This is a top view of the structure of embodiments one to four of this utility model.

[0021] Appendix Figure 5 For the appendix Figure 4 A magnified structural diagram of point A in the middle.

[0022] Appendix Figure 6 The diagram shows the circuit structure of embodiments one to four of this utility model.

[0023] The codes in the attached diagram are as follows: 1 is the rail, 2 is the measuring pad, 3 is the tilt sensor, 4 is the fixed block, 5 is the movable block, 6 is the tension screw, 7 is the slide groove, 8 is the slider, 9 is the front fixed plate, 10 is the rear fixed plate, 11 is the adjusting screw, 12 is the adjusting rod, 13 is the hinge seat, 14 is the connecting pin, 15 is the adjusting groove, 16 is the connecting rod, 17 is the connecting block, 18 is the front guide plate, 19 is the front guide hole, 20 is the front guide pin, 21 is the rear guide plate, 22 is the rear guide hole, 23 is the rear guide pin, 24 is the first pressure sensor, and 25 is the second pressure sensor. Detailed Implementation

[0024] This utility model is not limited to the following embodiments, and the specific implementation method can be determined according to the technical solution of this utility model and the actual situation.

[0025] In this utility model, for ease of description, the description of the relative positions of the components is based on the appendix to the specification. Figure 1 The layout is described using a diagrammatic method, such as the positional relationships of front, back, top, bottom, left, and right, which are based on the instructions attached. Figure 1 The orientation of the layout is determined by the direction of the map.

[0026] The present invention will be further described below with reference to the embodiments and accompanying drawings:

[0027] Example 1: As shown in the attached document Figures 1 to 6 As shown, the calibration fixture for the small radius, large superelevation curve includes a measuring pad 2, an inclination sensor 3, a measuring display module, and a mounting base that can be clamped onto the upper outer side of the rail 1. The mounting base includes a fixed block 4, a movable block 5, and a tensioning screw 6. The front end of the fixed block 4 has a clamping groove that opens downwards and runs through the front and back. The inner wall of the left part of the clamping groove matches the upper outer side of the rail 1. The upper right side of the fixed block 4 has a vertically extending sliding groove 7. The sliding groove 7 is T-shaped, wider at the top and narrower at the bottom. A T-shaped slider 8, whose lower side is located in the clamping groove, is slidably installed in the sliding groove 7. The lower side of the slider 8 is connected to the movable block 5 located in the clamping groove. The upper sides are fixed together. The left side of the movable block 5 matches the upper right side of the rail 1. The right side of the fixed block 4 is provided with a tensioning screw hole that runs through the left and right sides. The tensioning screw hole is screwed with a tensioning screw rod 6 whose left end is rotatably installed with the right side of the movable block 5. The upper side of the fixed block 4 is provided with a measuring pad 2 with the same cross section as the rail 1. The right side of the measuring pad 2 and the fixed block 4 are provided with an adjustment mechanism that can adjust the tilt angle of the measuring pad 2. The upper front side of the measuring pad 2 is provided with a front mounting groove that opens forward. The tilt sensor 3 is fixedly installed in the front mounting groove and is connected to the measurement display module.

[0028] Depending on the requirements, a handle is fixedly installed on the outer side of the right end of the tensioning screw 6, making the rotation of the tensioning screw 6 easier. The adjustment structure can be a known angle adjustment mechanism, such as the WN03GM10 manual angle positioner, or the adjustable angle pad mechanism described in the patent document CN209319266U entitled "An Adjustable Angle Pad Mechanism". The tilt sensor 3 is a known technology, such as an inclinometer or XK260D tilt sensor. The measurement display module is a known technology, such as the interactive screen and processor described in the patent document CN117492476B entitled "An Automated Attitude Adjustment System and Method for a Beam Transport Vehicle", or the monitoring system disclosed in the publication CN114509112A entitled "A Wireless Bridge Health Remote Multi-Parameter Monitoring System" (a bridge health monitoring system based on LoRa).

[0029] During use, the measurement display module and the adjustment mechanism for adjusting the tilt angle of the measuring pad 2 can eliminate the influence of excessive accuracy difference after the measuring trolley is calibrated on the superelevation curve. The upper part of the measuring pad 2 has the same cross-section as the 60-type rail (or 50-type rail, the measuring pad 2 is made according to the actual rail 1 cross-section). The mounting base can fix the measuring pad 2 on the calibration rail surface of the straight rail 1. Since the rail 1 of the superelevation curve has a certain design tilt angle, the tilt angle sensor 3 is installed on the side of the measuring pad 2. The tilt angle of the measuring pad 2 is adjusted according to the design tilt angle through the adjustment mechanism, so that the tilt angle of the measuring pad 2 is the same as the design tilt angle. This can simulate the actual working state of the vehicle on the small radius superelevation curve. It can accurately realize the real state of wheel-rail contact when there is a superelevation of (between 100mm and 125mm). After the measuring trolley is calibrated by the measuring pad 2, the working efficiency and quality of large track maintenance machinery in the superelevation curve section will be greatly improved, and the problem of poor leveling after operation of large track maintenance machinery vehicles in this section will be completely solved.

[0030] The calibration fixture for the above-mentioned small-radius, large-superelevation curve can be further optimized and / or improved according to actual needs:

[0031] Example 2: As an optimization of the above examples, as shown in the appendix. Figures 1 to 5 As shown, the adjustment mechanism includes a front fixed plate 9, a rear fixed plate 10, an adjusting screw 11, an adjusting rod 12, and a hinge seat 13. The front fixed plate 9 and the rear fixed plate 10 are fixedly installed on the left front side and the left rear side of the fixed block 4, respectively. The front side of the front fixed plate 9 and the front side of the rear fixed plate 10 are provided with hinge holes that pass through from front to back. A connecting pin 14 that is fixedly installed together with the left side of the measuring pad 2 is rotatably installed in each hinge hole. The right side of the measuring pad 2 is provided with an adjustment groove 15 that opens to the right and passes through from top to bottom. An adjusting rod 12 is rotatably installed in the adjustment groove 15. An adjusting screw hole that passes through radially is provided in the middle of the adjusting rod 12. A hinge seat 13 is fixedly installed on the upper side of the fixed block 4 corresponding to the lower left position of the adjusting rod 12. A connecting rod 16 is hingedly installed in the hinge seat 13. A connecting block 17 is fixedly installed on the outer side of the middle part of the connecting rod 16. An adjusting screw 11 with its lower end rotatably installed together with the connecting block 17 is screwed into the adjusting screw hole.

[0032] A front guide plate 18 is fixedly installed on the right front side of the fixing block 4 corresponding to the front position of the measuring pad 2. The front guide plate 18 has a front guide hole 19 with an arc shape that opens to the left and is coaxial with the connecting pin 14. A front guide pin 20 with its rear end fixedly installed together with the front side of the measuring pad 2 is provided in the front guide hole 19. A rear guide plate 21 is fixedly installed on the right rear side of the fixing block 4 corresponding to the rear position of the measuring pad 2. A rear guide hole 22 with an arc shape that opens to the left and is coaxial with the connecting pin 14 is provided on the front side of the rear guide plate 21. A rear guide pin 23 with its front end fixedly installed together with the rear side of the measuring pad 2 is provided in the rear guide hole 22.

[0033] According to the requirements, each hinge hole is rotatably installed with a connecting pin 14 that is fixedly installed together with the left side of the measuring pad 2. The rear end of the front connecting pin 14 is fixedly installed together with the front left side of the measuring pad 2, and the front end of the rear connecting pin 14 is fixedly installed together with the rear left side of the measuring pad 2. The hinge seat 13 is a known technology and can also be composed of two ear plates fixedly installed at intervals on the upper right side of the fixing block 4. The diameter of the middle part of the adjusting rod 12 is larger than the diameter of the front and rear ends, which can increase the length of the adjusting screw hole and make the adjusting screw 11 more stable when rotating. A handwheel is fixedly installed on the outer side of the upper end of the adjusting screw 11 to facilitate the rotation of the adjusting screw 11. During use, rotating the adjusting screw 11 increases or decreases the distance between the connecting rod 16 and the adjusting rod 12, thereby adjusting the tilt angle of the measuring pad 2. The tilt angle is set according to the actual superelevation, simulating the actual working conditions on site, improving the working efficiency and quality of large road maintenance machinery in sections with large superelevation curves. The setting of the front guide pin 20 and the rear guide pin 23 makes the measuring pad 2 more stable during rotation, improving the accuracy of the measurement process.

[0034] Example 3: As an optimization of the above examples, as shown in the appendix. Figure 1 , 2 As shown in Figures 3, 4, and 6, the upper right side of the measuring pad 2 is provided with an upper mounting groove with an opening to the right. The first pressure sensor 24 is fixedly installed in the upper mounting groove and is connected to the measuring display module.

[0035] According to the requirements, the first pressure sensor 24 is a known technology, such as the LZ-FH planar membrane micro-weighing sensor. The upper side of the first pressure sensor 24 is flush with the upper surface of the measuring pad 2, or the upper side of the first pressure sensor 24 is located 1mm below the upper surface of the measuring pad 2. During use, the setting of the first pressure sensor 24 can detect whether the vertical loading force of the measuring trolley is within the standard range, reducing the impact on the accuracy of the operation after actual operation. It avoids the situation where the wheels of the measuring trolley are prone to derailment when operating on the rail 1 if the vertical pressure of the measuring trolley is too small, and the wheels of the measuring trolley will cause abnormal wear when the pressure is too large.

[0036] Example 4: As an optimization of the above examples, as shown in the appendix. Figure 1 , 2 As shown in Figures 3, 4, and 6, the upper left side of the measuring pad 2 corresponding to the position of the upper mounting slot is provided with an upward-facing left mounting slot. The upper part of the left mounting slot is connected to the left part of the upper mounting slot. A second pressure sensor 25 is fixedly installed in the left mounting slot. The right side of the second pressure sensor 25 protrudes from the upper right side of the measuring pad 2. The distance between the right side of the second pressure sensor 25 and the upper left side of the measuring pad 2 is 1 to 3 mm. The second pressure sensor 25 is connected to the measurement display module.

[0037] Based on the requirements, the second pressure sensor 25 utilizes existing known technology, such as the CPR12 pressure sensor. During use, the second pressure sensor 25 detects whether the lateral loading force on the wheels of the measuring trolley is within the standard range, reducing the impact on operational accuracy after actual operation. During curved operations, it prevents the measuring trolley wheels from not adhering properly to the side of the rail 1 when the lateral loading pressure is too low, which could lead to decreased detection accuracy or even damage to the track due to excessive errors. It also prevents abnormal wear on the wheel flanges and bearings of the measuring trolley when the lateral loading pressure is too high, which could cause the trolley to climb onto the rail 1 when passing through the rail 1 joint. The first pressure sensor 24 and the second pressure sensor 25 monitor the force on the measuring pad 2, helping to promptly identify potential safety hazards.

[0038] Installing a first pressure sensor 24 and a second pressure sensor 25 on the top and side working edges of the measuring pad 2 respectively allows for a better understanding of the force on the measuring pad 2. This enables monitoring of whether the vertical and lateral loading forces of the large road maintenance machinery testing system meet the standards. If the loading force does not meet the standards, timely adjustments can be made to eliminate the adverse effects of excessive or insufficient loading force on the testing system.

[0039] By designing corresponding measuring pads 2 for different track types and applicable scenarios, the pressure values ​​of the wheels of the measuring trolley on the top and side surfaces of the measuring pads 2 are detected, enabling the detection device to operate in a more stable state. Through testing and comparison of the operational accuracy of various types of measuring pads, a measuring pad 2 that is more suitable for small-radius, high-superelevation curve sections is designed, providing strong assurance for the safe operation and work quality of large road maintenance machinery after operation.

[0040] The above technical features constitute various embodiments of the present invention, which have strong adaptability and implementation effect. Unnecessary technical features can be added or removed according to actual needs to meet the needs of different situations.

Claims

1. A calibration fixture for small-radius, large-superelevation curves, characterized in that... The system includes a measuring pad, an inclination sensor, a measuring display module, and a mounting base that can be clamped onto the outer side of the upper part of the rail. The mounting base includes a fixed block, a movable block, and a tensioning screw. The front end of the fixed block has a clamping groove that opens downwards and runs through the front and back. The inner wall of the left part of the clamping groove matches the outer side of the upper part of the rail. The upper right side of the fixed block has a sliding groove that runs vertically through the rear. The sliding groove is T-shaped, wider at the top and narrower at the bottom. A T-shaped slider, whose lower side is located in the clamping groove, is slidably installed in the sliding groove. The lower side of the slider is fixedly installed together with the upper side of the movable block, which is located in the clamping groove. The left side of the movable block matches the upper right side of the rail. The right side of the fixed block has a through-hole for adjusting tension. A tension screw with its left end rotatably mounted together with the right side of the movable block is screwed into the tension screw hole. The upper side of the fixed block has a measuring pad with the same cross section as the rail. The right side of the measuring pad and the fixed block have an adjustment mechanism that can adjust the tilt angle of the measuring pad. The upper front side of the measuring pad has a front mounting groove with an opening facing forward. An inclination sensor is fixedly installed in the front mounting groove. The inclination sensor is connected to the measurement display module.

2. The calibration fixture for small-radius, large-superelevation curves according to claim 1, characterized in that... The adjustment mechanism includes a front fixed plate, a rear fixed plate, an adjusting screw, an adjusting rod, and a hinge seat. The front fixed plate and the rear fixed plate are fixedly installed on the front left side and the rear left side of the fixed block, respectively. The front fixed plate and the front of the rear fixed plate are provided with hinge holes that run through the front and rear. A connecting pin that is fixedly installed together with the left side of the measuring pad is rotatably installed in each hinge hole. The right side of the measuring pad is provided with an adjustment groove that opens to the right and runs through the top and bottom. An adjusting rod is rotatably installed in the adjustment groove. An adjusting screw hole that runs through the center of the adjusting rod is provided. A hinge seat is fixedly installed on the upper side of the fixed block corresponding to the lower left position of the adjusting rod. A connecting rod is hingedly installed in the hinge seat. A connecting block is fixedly installed on the outer side of the middle part of the connecting rod. An adjusting screw with its lower end rotatably installed together with the connecting block is screwed into the adjusting screw hole.

3. The calibration fixture for small-radius, large-superelevation curves according to claim 2, characterized in that... A front guide plate is fixedly installed on the right front side of the fixing block corresponding to the front position of the measuring pad. The front guide plate has a front guide hole with an arc shape that opens to the left and is coaxial with the connecting pin. A front guide pin with its rear end fixedly installed together with the front side of the measuring pad is provided in the front guide hole. A rear guide plate is fixedly installed on the right rear side of the fixing block corresponding to the rear position of the measuring pad. The rear guide plate has a rear guide hole with an arc shape that opens to the left and is coaxial with the connecting pin. A rear guide pin with its front end fixedly installed together with the rear side of the measuring pad is provided in the rear guide hole.

4. The calibration fixture for small-radius, large-superelevation curves according to claim 1, 2, or 3, characterized in that... The upper right side of the measuring pad is provided with an upper mounting groove with an opening to the right. A first pressure sensor is fixedly installed in the upper mounting groove and is connected to the measuring display module.

5. The calibration fixture for small-radius, large-superelevation curves according to claim 4, characterized in that... The measuring pad at the position of the upper mounting slot has an upward-facing left mounting slot on the upper left side. The upper part of the left mounting slot is connected to the left part of the upper mounting slot. A second pressure sensor is fixedly installed in the left mounting slot. The right side of the second pressure sensor protrudes from the upper right side of the measuring pad. The second pressure sensor is connected to the measurement display module.

6. The calibration fixture for small-radius, large-superelevation curves according to claim 5, characterized in that... The distance between the right side of the second pressure sensor and the upper left side of the measuring pad is 1 to 3 mm.

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