A rail web thickness gauge

Abstract

This invention discloses a rail limb thickness measuring ruler, comprising a main scale, a secondary scale, a measuring vernier caliper, and a positioning vernier caliper arranged perpendicularly to each other. A measuring arm is located below the measuring vernier caliper, with its horizontal bottom edge aligned with the 0 position of the measuring vernier caliper. Initially, the horizontal bottom edge is in close contact with the top of the positioning vernier caliper, and the end of the measuring arm, the 0 position of the positioning vernier caliper, and the 0 position of the secondary scale are aligned. The rail limb thickness is measured by using the secondary scale and the positioning vernier caliper in conjunction with the positioning transverse measuring position of the rail limb, and by using the measuring arm, the measuring vernier caliper, and the main scale in conjunction with the measuring position. This measuring ruler can be directly used for rail limb thickness detection at frog welds, effectively solving the detection deviations and human errors caused by qualitative detection of rail limb thickness. It addresses the pain points of low efficiency, strong reliance on experience, and non-quantitative expression of detection results in the detection process, achieving quantitative monitoring and measurement of rail limb thickness at international railway flash welding frog welds.

Description

Technical Field

[0001] This invention relates to the field of rail geometry measurement, and more particularly to a rail limb thickness measuring ruler. Background Technology

[0002] Flash welding technology has changed the previous practice of leaving gaps on the top of bolted frog rails, achieving the requirements of safe, smooth, and comfortable train passage through the frog. However, quality control of flash welding operations at frogs is a special process, and the geometric dimension inspection of the welded rail section is a crucial parameter for verifying the quality control level of flash welding operations, directly impacting train operation safety. International railway flash-welded frogs generally adhere to EU standards, which have high requirements for the geometric dimension inspection of the flash-welded parts and stringent quality control standards. In actual production, due to limitations in design requirements, inspection levels, manufacturing processes, and load-bearing structures, the thickness dimension inspection of the welded rail section is a weak point in quality control, leading to high potential safety risks for train operation. Therefore, the inspection of the rail section thickness dimension of flash-welded frogs in international railways is crucial. Currently, there are no dedicated measuring tools for this geometric dimension inspection, resulting in limitations in geometric dimension inspection and quality control.

[0003] The closest existing technology to this invention is the specialized measuring tool CN203881262U for measuring rail leg thickness. This tool adjusts the inclination of the measuring jaws on the main scale according to the slope of the upper surface of the rail leg for different rail types, thus achieving a rail leg thickness measurement tool applicable to various rail types. However, this tool can only measure the rail leg thickness at specific locations and cannot measure the thickness at different locations of the rail leg according to measurement requirements. It also cannot meet the international requirements for inspecting the rail leg thickness of welded sections of flash-welded frogs in railways. Summary of the Invention

[0004] To address the aforementioned problems, this invention aims to provide a rail limb thickness measuring ruler that can accurately measure the thickness of welded rail limb sections at specific measurement locations, avoiding the influence of subjective qualitative judgments or non-standard measurement methods on the test results.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows: a rail limb thickness measuring ruler includes a main scale, a secondary scale, a measuring vernier caliper, and a positioning vernier caliper, which are arranged perpendicularly to each other. The measuring vernier caliper is slidably connected to the main scale, and the positioning vernier caliper is slidably connected to the secondary scale. The positioning vernier caliper protrudes from the side of the secondary scale at a height less than the minimum thickness of the rail limb. The 0 position of the main scale is flush with the top edge of the secondary scale, and the 0 position of the secondary scale is far from the 0 position of the main scale, while the maximum reading scale line is close to the 0 position of the main scale. A measuring arm is provided below the measuring vernier caliper block, and the horizontal bottom edge of the measuring arm is flush with the 0 position of the measuring vernier caliper block. In the initial state, the horizontal bottom edge is in close contact with the top of the positioning vernier caliper block, and the end of the measuring arm, the 0 position of the positioning vernier caliper block, and the 0 position of the secondary scale are aligned. The secondary scale and the positioning vernier caliper block are used to locate the transverse measurement position of the rail limb, and the measuring arm, the measuring vernier caliper block, and the main scale are used to measure the rail limb thickness at the measurement position.

[0006] Preferably, the measuring vernier caliper and the positioning vernier caliper are respectively mounted on the main scale and the secondary scale, and positioning bolts are provided on the outer side of the measuring vernier caliper and the positioning vernier caliper, so that the positions of the measuring vernier caliper and the positioning vernier caliper on the main scale and the secondary scale can be fixed by the positioning bolts.

[0007] Preferably, the distance from the 0 position of the secondary scale to its outer end is greater than 1 / 2 of the width of the rail base.

[0008] Preferably, both the main scale and the secondary scale are provided with anti-detachment blocks at their outer ends.

[0009] Preferably, the 0 position of the measuring vernier caliper is aligned with the 5mm graduation line of the main scale, and the positioning vernier caliper protrudes 5mm from the side of the secondary scale.

[0010] Preferably, the main scale and the secondary scale are an integral structure, and the measuring arm is a right-angled triangular structure.

[0011] The beneficial effects of this invention are: 1. This invention enables direct measurement of the rail thickness of the welded section of the railway flash welding frog. It is easy to operate, has a stable structure, strong repeatability and applicability, high measurement accuracy, and good convenience.

[0012] 2. This invention can achieve arbitrary selection of the measurement depth direction through a sliding positioning vernier caliper block, enabling direct measurement of the thickness of different detection parts of the rail.

[0013] 3. This invention can directly read the test data, solving the problems of existing qualitative comparison tests, such as the inability to quantify and export test data, large test deviations, low test accuracy, high test error rate, and potential hazards to product quality and train operation safety.

[0014] 4. This invention enables a single measuring ruler to be used for measuring rail limb thickness at different types of frogs and different weld locations, significantly improving the efficiency of the inspection tool and the universality of the measurement objects, and adapting to the inspection needs of large-scale production scenarios.

[0015] 5. This invention is also applicable to the measurement of the thickness of ordinary rails, special rails, and rail limbs in any scenario. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the present invention.

[0017] Figure 2 For the present invention Figure 1 AA section diagram.

[0018] Figure 3 For the present invention Figure 1 BB cross-sectional view.

[0019] Figure 4 This is a schematic diagram of the measurement state of the present invention.

[0020] In the diagram: 11-Main scale; 12-Secondary scale; 21-Measuring vernier caliper; 211-Measuring arm; 22-Positioning vernier caliper; 3-Positioning bolt; 4-Anti-disengagement caliper. Detailed Implementation

[0021] To enable those skilled in the art to better understand the technical solutions of the present invention, the technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0022] See attached document Figures 1-4 The illustrated rail limb thickness measuring ruler includes a main scale 11, a secondary scale 12, a measuring vernier caliper block 21, and a positioning vernier caliper block 22, all perpendicular to each other. The measuring vernier caliper block 21 is slidably connected to the main scale 11, and the positioning vernier caliper block 22 is slidably connected to the positioning vernier caliper block 22. The main scale 11 and the secondary scale 12 are a single integrated structure. Figure 1 As shown, the height of the positioning vernier caliper block 22 protruding from the side of the secondary scale 12 is less than the minimum thickness of the rail limb, so as to prevent the measuring arm 211 from contacting the measuring vernier caliper block 21 without contacting the rail limb.

[0023] A measuring arm 211, preferably a right-angled triangular structure, is provided below the measuring vernier caliper block 21, and the horizontal base of the measuring arm 211 is aligned with the 0 position of the measuring vernier caliper block. Initially, this horizontal base is in close contact with the top of the positioning vernier caliper block, and the end of the measuring arm 211, the 0 position of the positioning vernier caliper block 22, and the 0 position of the secondary scale 12 are aligned. The secondary scale 12, in conjunction with the positioning vernier caliper block 22, positions the transverse measurement position of the rail limb. The measuring arm 211, the measuring vernier caliper block 21, and the main scale 11 work together to measure the rail limb thickness at the measurement position. The reading accuracy of the measuring vernier caliper block 21 with the main scale 11 and the positioning vernier caliper block 22 with the secondary scale 12 disclosed in this invention is 0.02 mm.

[0024] The measuring vernier caliper block 21 and the positioning vernier caliper block 22 are respectively mounted on the main scale 11 and the secondary scale 12, as follows: Figures 2-3 As shown, both the measuring vernier caliper block 21 and the positioning vernier caliper block 22 are preferably dovetail groove structures, which expose the scale lines of the main scale 11 and the secondary scale 12 to facilitate measurement, observation, and reading.

[0025] like Figure 1 , 4 As shown, positioning bolts 3 are provided on the outer sides of both the measuring vernier caliper block 21 and the positioning vernier caliper block 22. The positions of the measuring vernier caliper block 21 and the positioning vernier caliper block 22 on the main scale 11 and the secondary scale 12 can be fixed by the positioning bolts 3.

[0026] like Figure 4 As shown, during the measurement process, the secondary scale 12 is flat against the bottom surface of the rail leg. A longer flat mounting length increases the stability of the measurement. Therefore, as shown... Figure 1 , 4 As shown, the distance from the 0 position of the secondary scale 12 to its outer end is greater than 1 / 2 of the width of the rail bottom, so that the secondary scale 12 is basically flush with the bottom surface of the rail, improving the stability during measurement.

[0027] To prevent the measuring vernier caliper block 21 and the positioning vernier caliper block 22 from slipping, such as Figure 1 As shown, both the main scale 11 and the secondary scale 12 are provided with anti-detachment blocks 4 near their outer ends. These blocks pass through the tail ends of the main scale 11 and the secondary scale 12 and extend out of the surfaces on both sides of the main scale 11 and the secondary scale 12.

[0028] like Figure 4 As shown, during measurement, the positioning vernier caliper block 22 is located inside the end of the measuring arm 211. During multiple measurements along the length of the rail, positioning the vernier caliper block 22 inside the end of the measuring arm 211 enables rapid positioning and measurement. However, when the positioning vernier caliper block 22 is located inside the end of the measuring arm 211, the measuring arm 211 is obstructed, making it difficult to return the vernier caliper block 21 to its original position and reassemble it. Therefore, as... Figure 1 , 4As shown, the 0 position of the measuring vernier caliper is aligned with the 5mm graduation line of the main scale 11, and the positioning vernier caliper protrudes 5mm from the side of the secondary scale 12. This alignment structure ensures that during continuous measurement, the positioning vernier caliper 22 remains at approximately the approximate measurement position for the transverse width of the rail limb, eliminating the need for frequent movement of the positioning vernier caliper 22 from the 0 position on the secondary scale 12, thus improving continuous measurement efficiency. The measuring arm 211 rests against the positioning vernier caliper 22, and slides upwards when measuring the rail limb thickness. This structure also ensures that when the measuring scale is being retracted, the positioning vernier caliper 22 remains inside the end of the measuring arm 211. After the measuring arm 211 and the bottom surface of the positioning vernier caliper 22 are in contact, the measuring vernier caliper 21 can simultaneously be in contact with the secondary scale 12, facilitating measurement operations and the retraction of the measuring scale.

[0029] Similarly, for easy storage and handling of the measuring ruler, such as Figure 1 , 4 As shown, the main scale 11 is lower than the top of the secondary scale 12, so that the measuring vernier caliper block 21 is flush with the top of the secondary scale 12.

[0030] The manufacturing specifications of the measuring ruler disclosed in this invention are as follows: 1. Main scale 11: It is integrally formed with the secondary scale 12 at a 90° perpendicularity. It has a total length of 300mm, a total width of 18mm, and a thickness of 5mm. It is made of 4Cr13 stainless steel with a minimum hardness of 450HV. Its measuring surface is made by scraping or precision grinding. The surface is laser-etched with scales. The maximum surface roughness is Ra0.5μm. The zero position is marked from the plane perpendicular to the secondary scale 12. The measuring range is 0-250mm. 2. Secondary scale 12: The total length is 200mm, the total width is 18mm, and the thickness is 5mm. It is made of 4Cr13 stainless steel. Its measuring surface is made by scraping or precision grinding. The surface is laser-etched with scales. The minimum hardness is 450HV, and the maximum surface roughness is Ra0.5μm. The zero position is marked 140mm from the tip of the secondary scale 12. The measuring range is 0-100mm.

[0031] 3. Measuring vernier caliper block 21 (including positioning adjustment bolt): The total length is 60mm, the total width is 30mm, the thickness is 5mm, and it is made of 4Cr13 stainless steel. Its measuring surface is made by scraping or precision grinding process, and the surface is laser-etched with scale. The minimum hardness is 450HV and the maximum surface roughness is Ra0.5μm.

[0032] 4. Positioning Vernier Caliper Block 22 (including positioning adjustment bolt): The positioning reading sliding vernier caliper block is nested on the secondary scale 12 with a dovetail groove structure, and can slide freely on the secondary scale 12. It has a total length of 20mm, a total width of 30mm, and a thickness of 5mm. It is made of 4Cr13 stainless steel, and its measuring surface is made by scraping or precision grinding. The surface is laser-etched with scales, with a minimum hardness of 450HV and a maximum surface roughness of Ra0.5μm.

[0033] 5. The anti-slip block 4 is assembled at the ends of the main and auxiliary scales 12 by riveting or welding to prevent the measuring reading sliding vernier caliper and the positioning reading sliding vernier caliper from slipping off the main and auxiliary scales 12. The anti-slip block 4 has a total length of 12mm, a total width of 5mm, and a thickness of 1mm, and is made of 4Cr13 stainless steel.

[0034] How to use a measuring ruler: Figure 4 As shown, first open the measuring vernier caliper block 21, slide the positioning vernier caliper block 22 until its zero mark is aligned with the 14mm mark of the secondary scale 12 (taking the 14mm section of the rail limb thickness detection at the European standard flash welded frog weld as an example), tighten the positioning bolt 3, flatten the secondary scale 12 against the bottom of the rail limb, and make the side of the rail limb closely fit with the positioning vernier caliper block 22, slide the measuring vernier caliper block 21 so that its measuring tip is closely fitted against the upper surface of the rail limb, tighten the positioning bolt 3, remove the measuring scale, and read the rail limb thickness measurement data.

[0035] The reading method is the same as that of conventional vernier caliper reading. First, read the main scale 11. If the 0 position of the measuring vernier caliper 21 is between adjacent scale lines on the main scale 11, then read the lower scale line value as an integer. Then, determine a line on the measuring vernier caliper 21 that is completely aligned with the scale line of the main scale 11. The reading accuracy of the measuring scale of this invention is 0.02mm. Then, measure the number of the aligned line on the measuring vernier caliper 21 × 0.02mm, which is the decimal value after the integer.

[0036] For example, if the integer reading on the main scale 11 is 14mm and the aligned line number on the measuring vernier caliper block 21 is 20, then the decimal value is 20 × 0.02mm = 0.4mm, and the measurement reading of the main scale 11 is 14 + 0.4 = 14.4mm.

[0037] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Various changes and modifications can be made to the present invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of protection claimed by the present invention.

Claims

1. A gauge for measuring the thickness of rail legs, characterized in that: It includes a main scale, a secondary scale, a measuring vernier caliper, and a positioning vernier caliper, all arranged perpendicularly to each other. The measuring vernier caliper is slidably connected to the main scale, and the positioning vernier caliper is slidably connected to the secondary scale. The positioning vernier caliper protrudes from the side of the secondary scale at a height less than the minimum thickness of the rail. The 0 position of the main scale is flush with the top edge of the secondary scale, and the 0 position of the secondary scale is far from the 0 position of the main scale, while the maximum reading scale line is close to the 0 position of the main scale. A measuring arm is provided below the measuring vernier caliper block, and the horizontal bottom edge of the measuring arm is flush with the 0 position of the measuring vernier caliper block. In the initial state, the horizontal bottom edge is in close contact with the top of the positioning vernier caliper block, and the end of the measuring arm, the 0 position of the positioning vernier caliper block, and the 0 position of the secondary scale are aligned. The secondary scale and the positioning vernier caliper block are used to locate the transverse measurement position of the rail limb, and the measuring arm, the measuring vernier caliper block, and the main scale are used to measure the rail limb thickness at the measurement position.

2. The measuring ruler according to claim 1, characterized in that: The measuring vernier caliper and the positioning vernier caliper are respectively mounted on the main scale and the secondary scale, and positioning bolts are provided on the outer side of the measuring vernier caliper and the positioning vernier caliper. The positions of the measuring vernier caliper and the positioning vernier caliper on the main scale and the secondary scale can be fixed by the positioning bolts.

3. The measuring ruler according to claim 1, characterized in that: The distance from the 0 position of the secondary scale to its outer end is greater than 1 / 2 of the width of the rail base.

4. The measuring ruler according to claim 1, characterized in that: Both the main scale and the auxiliary scale are equipped with anti-detachment blocks at their outer ends.

5. The measuring ruler according to claim 1, characterized in that: The measuring vernier caliper block at position 0 is aligned with the 5mm graduation line of the main scale, and the positioning vernier caliper block protrudes 5mm from the side of the secondary scale.

6. The measuring ruler according to claim 1, characterized in that: The main scale and the secondary scale are integrated into one unit, and the measuring arm is a right-angled triangular structure.

Images