Special vernier caliper for guard rail installation size measurement and measurement method thereof

Abstract

The invention provides a vernier caliper special for guard rail installation size measurement and a measurement method thereof. The vernier caliper comprises a main ruler, an auxiliary ruler, a main ruler vernier and an auxiliary ruler vernier. The main ruler vernier scale is provided with a measuring jaw I of which the increasing height is consistent with the height of the guard rail; the horizontal length of the measuring jaw I and the guard rail is equal to the horizontal length of the main ruler vernier scale; the main vernier scale is provided with a horizontal bubble instrument; the main ruler and the auxiliary ruler are connected in a sliding fit mode, the auxiliary ruler vernier scale is connected with the auxiliary ruler in a sliding fit mode, the bottom end of the auxiliary ruler is provided with a zero scale line, the zero scale line of the auxiliary ruler is aligned with the lowermost end of the auxiliary ruler vernier scale to serve as a starting zero position, and the thickness between the zero scale line of the auxiliary ruler and the lower edge of the auxiliary ruler is equal to the gap between the main ruler and the upper end face of the guard rail. The main scale zero scale is aligned with the edge of the auxiliary scale vernier scale to serve as a starting zero position, and the width of the left side of the measuring jaw extending out of the main scale vernier scale is equal to the gap between the right end face of the auxiliary scale and the main scale zero scale. A measuring jaw II is integrally formed at the bottom of the auxiliary ruler. According to the invention, accurate measurement of the dimension A of the guard rail rim groove and the relative height difference dimension B of the guard rail and the stock rail can be realized.

Description

Technical Field

[0001] The invention belongs to the technical field of railway frogs, and specifically relates to a special vernier caliper for measuring the installation dimensions of a guardrail and a measuring method thereof, in particular to a special customized vernier caliper for measuring the installation dimensions of a frog guardrail. Background Art

[0002] (like Figure 1 (As shown in the figure) In the manufacture of railway turnouts, the guardrail wheel flange groove size A and the relative height difference size B between the guardrail and the base rail are important control dimensions in the assembly process of the turnout. However, there has been no accurate measurement tool. The length of the ordinary vernier caliper jaw is limited, and it is impossible to complete accurate measurement. The measurement error is large and the product quality cannot be effectively guaranteed. In this regard, the following technical solution is proposed. Summary of the invention

[0003] The technical problem solved by the present invention is to provide a special vernier caliper for measuring the installation dimensions of a guardrail and a measuring method thereof, so as to solve the technical problem that the measuring jaw length of an ordinary vernier caliper is limited, the accurate measurement of the guardrail wheel rim groove dimension A and the relative height difference dimension B between the guardrail and the base rail cannot be completed, and the measuring error is large, so the product quality cannot be effectively guaranteed.

[0004] The technical solution adopted by the present invention is as follows: a vernier caliper specially used for measuring the installation dimensions of a guardrail, comprising a main scale, a secondary scale, a main scale vernier scale, and a secondary scale vernier scale; a measuring claw I is vertically formed at the end of the main scale vernier scale, and the vertical height of the measuring claw I is consistent with the height of the left side of the guardrail, and the right side of the measuring claw I is measured in contact with the left edge of the guardrail, and the horizontal length of the measuring claw I and the guardrail is equal to the horizontal length of the main scale vernier scale; a horizontal bubble meter is provided on the main scale vernier scale, and the horizontal bubble meter is used for horizontal positioning of the main scale and the main scale vernier scale; the main scale is slidably adapted to be connected; and the main scale is slidably adapted to be connected At the same time, the secondary scale vernier is also connected with the secondary scale in a sliding manner; a secondary scale zero mark is formed at the bottom end of the secondary scale, and the secondary scale zero mark is aligned with the lowest end of the secondary scale vernier as the starting zero position; at the same time, the thickness of the secondary scale zero mark from the lower edge of the secondary scale is equal to the gap between the main scale and the upper end face of the guardrail; and the zero mark of the main scale is aligned with the edge of the secondary scale vernier as the starting zero position of the main scale, and the width of the left side of the measuring claw extending out of the main scale vernier is the same as the gap between the right end face of the secondary scale and the zero mark of the main scale; the bottom of the scale body of the secondary scale is its measuring claw II, and the measuring claw II is integrally formed with the secondary scale.

[0005] Based on the above technical solution, it is preferred that the bottoms of the measuring claws I and II are both long rectangular structures.

[0006] On the basis of the above technical solution, further: it also includes fasteners for the main scale vernier scale and the auxiliary scale vernier scale.

[0007] Based on the above technical solution, preferably: the level bubble meter is assembled on the main scale vernier scale by using a bracket or bolts.

[0008] Based on the above technical solution, preferably: the vernier caliper is a vernier caliper made of stainless steel or a special alloy, or the vernier caliper is a vernier caliper made of titanium alloy or aluminum alloy.

[0009] Based on the above technical solution, preferably, the special alloy is one of a nickel-based alloy and a cobalt-based alloy.

[0010] Based on the above technical solution: the main scale, auxiliary scale, main scale vernier scale and auxiliary scale vernier scale are all in millimeters.

[0011] On the basis of the above technical solution: the main scale vernier scale and the auxiliary scale vernier scale are made with 50 divisions, so that the measurement accuracy of the vernier caliper is 0.02mm.

[0012] The present invention also claims protection for a method for measuring the guardrail installation dimension using a special vernier caliper, which uses any special vernier caliper for measuring the guardrail installation dimension to measure the wheel flange groove dimension A of the frog guardrail and the relative height difference dimension B between the guardrail and the base rail in railway turnout manufacturing; the method comprises the following steps:

[0013] Step 1: Measure the size A of the guardrail wheel flange groove;

[0014] Step 2: Measure the relative height difference B between the guard rail and the base rail.

[0015] Based on the above technical solution: wherein, step 1 and step 2 can complete the measurement by only two steps, namely, the adjustment step and the measurement step;

[0016] Among them, the steps of step 1 are:

[0017] Step 101, taking the point where the end face of the secondary scale is perpendicular to the plane of the primary scale as the origin of the primary caliper;

[0018] Step 102, during measurement, ensure that the right side of the measuring jaw I of the main scale vernier is in contact with the left working surface of the guardrail, the lower end of the measuring jaw II of the auxiliary scale is in contact with the position of the "gauge line" of the base rail, the bubble of the bubble level on the main scale vernier is in the middle position, and the lower plane of the main scale vernier is in contact with the upper surface of the guardrail. The value read on the main scale vernier is the wheel flange groove size A of the frog guardrail;

[0019] Among them, the steps of step 2 are:

[0020] Step 201, taking the point where the plane of the main scale is perpendicular to the plane of the secondary scale as the origin of the secondary scale;

[0021] Step 202, during measurement, ensure that the lower plane of the main scale vernier on the main scale fits the upper surface of the guard rail, the bubble of the bubble level on the main scale vernier is located in the middle, the lower end surface of the measuring claw II of the auxiliary scale fits the highest point of the base rail, and the value read on the auxiliary scale vernier is the relative height difference B between the guard rail and the base rail.

[0022] The advantages of the present invention compared with the prior art are:

[0023] 1. The present invention can accurately measure the guardrail wheel flange groove size A and the relative height difference size B between the guardrail and the base rail through the three-sided positioning of the main scale, the auxiliary scale and the vernier scale; the measurement accuracy can reach 0.02mm.

[0024] 2. According to the structural technical scheme, the present invention can manufacture corresponding measuring tools for various types of turnout guardrails to meet the needs of measuring the wheel flange groove dimensions of various guardrails and the relative height difference dimensions between the guardrail and the base rail.

[0025] 3. All parts of the present invention are easy to purchase and produce, and no new environmental hazards and safety risks are added during the production process, so it can be widely used.

[0026] 4. The steps of the method of the present invention are relatively simple. After being used proficiently, it can effectively improve the detection efficiency and ensure the quality of product delivery while ensuring the detection accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the installation dimensions A and B to be measured of the frog guard rail described in the background technology of the present invention;

[0028] Figure 2 It is a front view of the special vernier caliper of the present invention;

[0029] Figure 3 It is a state diagram of the measurement results of the measurement of the guardrail wheel flange groove dimension A in the measurement method of the present invention;

[0030] Figure 4 It is a state diagram of the measurement result of measuring the relative height difference B between the guard rail and the base rail in the measurement method of the present invention;

[0031] In the figure: 1-main scale, 2-guard rail, 3-level bubble gauge, 4-main scale vernier, 5-measuring jaws I, 6-secondary scale, 601-secondary scale zero mark, 7-secondary scale vernier, 8-measuring jaws II, 9-basic rail, 901-gauge line, 10-fasteners. DETAILED DESCRIPTION

[0032] The following will be combined with the attached embodiment of the present invention Figure 1-4, the technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] To achieve the above-described background technology Figure 1 The following technical solutions are proposed for the measurement of the installation dimensions A and B of the frog guardrail shown in the figure:

[0034] (like Figure 2 A vernier caliper specially used for measuring the installation dimensions of a guardrail is disclosed herein, comprising a main scale 1, a secondary scale 6, a main scale vernier scale 4, and a secondary scale vernier scale 7. As a vernier caliper, first of all, it should be noted that: the present invention should be understood as a vernier ruler, and the only difference between the present invention and a conventional vernier caliper is that: the assembly connection relationship between the main scale 1 and the main scale vernier scale 4 is the same as the assembly connection relationship of the existing vernier scale; the assembly connection relationship between the secondary scale 6 and the secondary scale vernier scale 7 is the same as the assembly connection relationship of the existing vernier scale.

[0035] The present invention is different from the existing vernier caliper in that: Figure 2 As shown, and see Figure 3 , Figure 4 ) The end of the main scale vernier ruler 4 is vertically provided with an increased measuring claw Ⅰ5, and the increased vertical height of the measuring claw Ⅰ5 is consistent with the height of the left side of the guardrail 2, and the right side of the measuring claw Ⅰ5 is measured in contact with the left edge of the guardrail 2, and the horizontal length of the measuring claw Ⅰ5 and the guardrail 2 is equal to the horizontal length of the main scale vernier ruler 4; the main scale vernier ruler 4 is provided with a horizontal bubble meter 3, and the horizontal bubble meter 3 is used for horizontal positioning of the main scale 1 and the main scale vernier ruler 4; the main scale 1 is slidably connected to the secondary scale 6; and while the main scale 1 is slidably connected to the secondary scale 6, the secondary scale vernier ruler 7 is also slidably connected to the secondary scale 6 ; A secondary scale zero mark 601 is formed at the bottom end of the secondary scale 6, and the secondary scale zero mark 601 is aligned with the lowest end of the secondary scale vernier scale 7 as the starting zero position; at the same time, the thickness of the secondary scale zero mark 601 from the lower edge of the secondary scale 6 is equal to the gap between the main scale 1 and the upper end surface of the guardrail 2; and the zero mark of the main scale 1 is aligned with the edge of the secondary scale vernier scale 7 as the starting zero position of the main scale 1, and the width of the left side of the measuring claw 5 extending out of the main scale vernier scale 4 is the same as the gap between the right end surface of the secondary scale 6 and the zero mark of the main scale 1; the bottom of the scale body of the secondary scale 6 is its measuring claw Ⅱ8, and the measuring claw Ⅱ8 is integrally formed with the secondary scale 6.

[0036] It can be found from the above description that after the present invention is skillfully operated according to the measuring method steps described below, the measurement of the guardrail wheel flange groove size A and the relative height difference size B between the guardrail and the base rail can be achieved.

[0037] Based on the above embodiments, it is preferred that: different from the existing vernier caliper jaw structure, the bottom of the jaws I5 and II8 are both long rectangular structures with a "certain horizontal width". The "certain horizontal width" is determined according to the turnout standard. The purpose of adopting the "long rectangular structure" is to facilitate the reference positioning of the "jaws I5 and II8" when used as a "ruler".

[0038] Based on the above embodiment, further: in order to avoid the measurement result from changing due to accidental touch, the present invention may also include a fastener 10 (such as Figure 2 The fastener 10 is used to lock the positions of the main scale vernier 4 and the secondary scale vernier 7, and the locking method thereof is the same as the locking method of the vernier caliper in the prior art, which will not be described in detail.

[0039] Based on the above embodiment, preferably, in order to ensure the assembly and use accuracy of the level bubble meter 3 and the measurement accuracy of the vernier caliper, the level bubble meter 3 is assembled on the main scale vernier scale 4 by a bracket or bolts. The bracket is a customized bracket; the bolt is a conventional bolt.

[0040] The technical advantage of the improved embodiment of the customized "bracket" is that the customized bracket is designed and produced according to the specific size, weight and assembly requirements of the bubble level 3 and the main scale vernier scale 4, so it can accurately adapt to the assembly requirements of the two, ensuring the stability and accuracy of the assembly. The customized bracket can be optimized according to the characteristics and usage requirements of the bubble level 3, reducing errors and deformations during the assembly process, thereby improving the assembly accuracy and usage accuracy of the bubble level 3. The customized bracket can be designed and adjusted according to the actual usage scenario, enhancing the stability of the bubble level 3 during assembly and use, and avoiding the influence of vibration or external force interference on the measurement accuracy. The customized bracket can be designed and produced according to actual needs, avoiding unnecessary waste, thereby reducing production costs and assembly costs.

[0041] The technical advantage of the improvement of the conventional "bolt" embodiment is that conventional bolts, as commonly used fasteners in mechanical connections, have wide versatility and can be applied to assembly requirements of various sizes and types. Conventional bolts can provide reliable connection force through threaded connection to ensure a stable connection between the level bubble meter 3 and the main scale vernier scale 4. The installation process of conventional bolts is relatively simple and does not require complex tools and equipment, which can save installation time and cost. The maintenance and replacement of conventional bolts are relatively easy and can be replaced or repaired without disassembling the entire assembly structure.

[0042] Based on the above embodiments, preferably: the vernier caliper is a vernier caliper made of stainless steel or special alloy.

[0043] Regarding this embodiment, it should be noted that: when the vernier caliper is made of stainless steel or special alloy, its technical advantage is that stainless steel or special alloy has excellent wear resistance and corrosion resistance, can maintain accuracy for a long time in a harsh working environment, and thus has a long service life, reducing the cost and time of frequent tool replacement. Among them, it is necessary to clarify the definition of "special alloy": special alloys generally refer to high-temperature alloys, precision alloys, corrosion-resistant alloys, high-resistance electric heating alloys and special functional alloys. These alloys can be further classified according to their basic characteristics and basic constituent elements, such as iron-based alloys, nickel-based alloys, cobalt-based alloys, etc. according to the basic constituent elements.

[0044] Based on the above embodiments, preferably, the vernier caliper is a vernier caliper made of titanium alloy or aluminum alloy.

[0045] Regarding this embodiment, it should be noted that: when the vernier caliper is a vernier caliper made of titanium alloy or aluminum alloy, its greatest technical advantage is that it is corrosion-resistant and lightweight. In addition, due to the low density but high strength of titanium alloy, the titanium alloy vernier caliper is both light and durable, reducing fatigue during use and extending the service life of the tool. Furthermore, titanium alloy has excellent corrosion resistance, can maintain accuracy for a long time in a humid and corrosive environment, and is suitable for measurement tasks in harsh working environments. Compared with titanium alloy, the raw material cost of aluminum alloy is lower, which makes the aluminum alloy vernier caliper more competitive in price while still providing high measurement accuracy and durability. In addition, the aluminum alloy vernier caliper also has good corrosion resistance and can resist the erosion of high temperature and corrosive environment within a certain range.

[0046] Based on the above embodiments, it is further preferred that: the special alloy is one of a nickel-based alloy and a cobalt-based alloy.

[0047] When the material of the vernier caliper is a nickel-based alloy or a cobalt-based alloy in a special alloy, each of them exhibits unique technical advantages: these advantages make the vernier caliper significantly improved in terms of measurement accuracy, durability, and applicable environment. The specific analysis is as follows: Nickel-based alloys have excellent mechanical and physical properties, including high strength, high toughness, and good deformation resistance. These characteristics enable the nickel-based alloy vernier caliper to maintain high precision and stability during the measurement process, ensuring the accuracy of the measurement results. Nickel-based alloys have excellent high temperature resistance and corrosion resistance, and can maintain accuracy and performance for a long time in high temperature, high pressure, and highly corrosive environments. This makes the nickel-based alloy vernier caliper suitable for measurement tasks in various harsh working environments, such as chemical, petroleum, and other fields. Nickel-based alloys have good processability and weldability, and are easy to manufacture and repair; this enables the nickel-based alloy vernier caliper to maintain high precision during the manufacturing process, and is also easy to repair or replace when damaged. Cobalt-based alloys have extremely high strength and hardness, as well as good wear resistance. These properties enable cobalt-based alloy vernier calipers to resist wear and deformation during measurement and maintain high-precision measurement capabilities. Cobalt-based alloys also have excellent high-temperature resistance and oxidation resistance, and can maintain stable performance in high-temperature environments. This makes cobalt-based alloy vernier calipers suitable for measurement tasks in high-temperature environments, such as engine manufacturing, nuclear industry and other fields. Cobalt-based alloys also have good corrosion resistance and can resist erosion by a variety of chemical substances; this allows cobalt-based alloy vernier calipers to maintain accuracy and performance in corrosive environments.

[0048] When the present invention is only applied to the above-described background art Figure 1 In the measurement field of the installation dimensions A and B of the frog guard rail to be measured as shown: the main scale 1, the auxiliary scale 6, the main scale vernier scale 4, and the auxiliary scale vernier scale 7 are all in millimeters to meet the use requirements.

[0049] When the present invention is expanded to be applied to approximation and other fields, further: the main scale vernier scale 4 and the auxiliary scale vernier scale 7 are made with 50 grids, so that the measurement accuracy of the vernier caliper is 0.02mm.

[0050] (like Figure 3 , Figure 4 The present invention also claims a method for measuring the guardrail installation dimension using a special vernier caliper, which is used to measure the wheel flange groove dimension A of the frog guardrail and the relative height difference dimension B between the guardrail and the base rail in railway turnout manufacturing; comprising the following steps:

[0051] Step 1: Measure the guardrail wheel flange groove size A first.

[0052] Step 2: Measure the relative height difference B between the guard rail and the base rail 9.

[0053] Among them, step 1 and step 2 can complete the measurement through only two steps, adjustment step and measurement step respectively. After mastering the technology, the detection efficiency can be effectively improved and guaranteed.

[0054] The specific steps of step 1 are:

[0055] Step 101, the point where the end surface of the secondary scale 6 is perpendicular to the plane of the main scale 1 is taken as the origin of the main caliper. That is, the first step is to determine the origin.

[0056] Step 102, during measurement, ensure that the right side surface of the measuring claw I5 of the main scale vernier ruler 4 is in contact with the left working surface of the guardrail 2, the lower end surface of the measuring claw II8 of the auxiliary ruler 6 is in contact with the position of the "gauge line" 901 of the base rail 9, the bubble of the bubble level 3 on the main scale vernier ruler 4 is located in the middle position, and the lower plane of the main scale vernier ruler 4 is in contact with the upper surface of the guardrail 2. The value read on the main scale vernier ruler 4 is the wheel flange groove size A of the frog guardrail;

[0057] The specific steps of step 2 are:

[0058] Step 201, take the point where the plane of the main ruler 1 is perpendicular to the plane of the secondary ruler 6 as the origin of the secondary ruler 6. That is, the first step is to determine the origin.

[0059] Step 202, during measurement, ensure that the lower plane of the main scale vernier scale 4 on the main scale 1 fits with the upper surface of the guard rail 2, the bubble of the bubble level 3 on the main scale vernier scale 4 is located in the middle position, the lower end surface of the measuring claw II 8 of the auxiliary scale 6 fits with the highest point of the base rail 9, and the value read on the auxiliary scale vernier scale 7 is the relative height difference B between the guard rail 2 and the base rail.

[0060] From the above description, it can be found that the measuring method of the present invention can realize accurate and rapid measurement of the guardrail wheel flange groove size A and the relative height difference size B between the guardrail and the base rail through the three-sided positioning of the main scale, the auxiliary scale and the vernier scale; the measurement accuracy can even reach 0.02mm. Furthermore, the measuring method of the present invention has relatively simple steps. After being used proficiently, it can effectively improve the detection efficiency and ensure the quality of product delivery while ensuring the detection accuracy.

[0061] Moreover, according to the structural technical scheme, the present invention can manufacture corresponding measuring tools for various types of turnout guardrails to meet the needs of measuring the wheel flange groove dimensions of various guardrails and the relative height difference dimensions between the guardrail and the base rail.

[0062] In addition, all parts of the present invention are easy to purchase and produce, and no new environmental hazard factors and safety risk factors are added during the production process, so the present invention can be widely used.

[0063] It should be understood that although this specification is mainly described according to one implementation method, this implementation method does not only include an independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in this embodiment can also be appropriately arranged and combined to form other implementation methods that can be understood by those skilled in the art.

[0064] The above preferred embodiments are not intended to limit the scope of implementation of the present invention, so all equivalent changes made to the contents described in the claims of the present invention should be included in the scope of the claims of the present invention; it should be noted that the components and materials used in the above embodiments are commercially available unless otherwise specified.

Claims

1. A vernier caliper for measuring the installation dimensions of a guardrail, comprising a main scale (1), a secondary scale (6), a main scale vernier scale (4), and a secondary scale vernier scale (7); characterized in that: The end of the main scale vernier scale (4) is vertically provided with an increased measuring claw I (5), and the increased vertical height of the measuring claw I (5) is consistent with the height of the left side of the guard rail (2), and the right side of the measuring claw I (5) is measured in contact with the left edge of the guard rail (2), and the horizontal length of the measuring claw I (5) and the guard rail (2) is equal to the horizontal length of the main scale vernier scale (4); the main scale vernier scale (4) is provided with a horizontal bubble meter (3), and the horizontal bubble meter (3) is used for horizontal positioning of the main scale (1) and the main scale vernier scale (4); the main scale (1) is slidably connected to the secondary scale (6); and while the main scale (1) is slidably connected to the secondary scale (6), the secondary scale vernier scale (7) is also slidably connected to the secondary scale (6); the bottom end of the secondary scale (6) is provided with a secondary scale zero mark (601), and the secondary scale zero mark (601) is aligned with the lowest end of the secondary scale vernier scale (7) as the starting zero position; At the same time, the thickness of the secondary scale zero mark (601) from the lower edge of the secondary scale (6) is equal to the gap between the main scale (1) and the upper end surface of the guard rail (2); the zero mark of the main scale (1) is aligned with the edge of the secondary scale vernier scale (7) as the starting zero position of the main scale (1), and the width of the left side of the measuring claw (5) extending from the main scale vernier scale (4) is the same as the gap between the right end surface of the secondary scale (6) and the zero mark of the main scale (1); the bottom of the scale body of the secondary scale (6) is its measuring claw II (8), and the measuring claw II (8) and the secondary scale (6) are integrally formed.

2. The special vernier caliper for measuring the guardrail installation dimensions according to claim 1, characterized in that: The bottoms of the measuring claws I (5) and II (8) are both long rectangular structures.

3. The special vernier caliper for measuring the guardrail installation dimensions according to claim 1, characterized in that: It also includes fasteners (10) for the main scale vernier scale (4) and the auxiliary scale vernier scale (7).

4. The special vernier caliper for measuring the guardrail installation dimensions according to claim 1, characterized in that: The horizontal bubble meter (3) is assembled on the main scale vernier scale (4) by using a bracket or bolts.

5. The special vernier caliper for measuring the guardrail installation dimensions according to claim 1, characterized in that: The vernier caliper is a vernier caliper made of stainless steel or a special alloy, or the vernier caliper is a vernier caliper made of titanium alloy or aluminum alloy.

6. The special vernier caliper for measuring the guardrail installation dimensions according to claim 5, characterized in that: The special alloy is one of a nickel-based alloy and a cobalt-based alloy.

7. The special vernier caliper for measuring the guardrail installation dimensions according to claim 1, characterized in that: The main scale (1), the auxiliary scale (6), the main scale vernier scale (4) and the auxiliary scale vernier scale (7) are all in millimeters.

8. The special vernier caliper for measuring the guardrail installation dimensions according to claim 7, characterized in that: The main scale vernier scale (4) and the auxiliary scale vernier scale (7) are formed with 50 grids, so that the measurement accuracy of the vernier caliper is 0.02 mm.

9. A method for measuring the installation dimensions of a guardrail using a special vernier caliper, characterized in that: Using any one of the vernier calipers for measuring the guardrail installation dimensions as claimed in claims 1 to 8, for measuring the wheel flange groove dimension A of the frog guardrail and the relative height difference dimension B between the guardrail and the base rail (9) in railway turnout manufacturing; comprising the following steps: Step 1: Measure the size A of the guardrail wheel flange groove; Step 2: Measure the relative height difference B between the guard rail and the base rail (9).

10. The measuring method according to claim 9, characterized in that: Step 1 and step 2 can complete the measurement by only two steps, namely, the adjustment step and the measurement step; Among them, the steps of step 1 are: Step 101, taking the point where the end surface of the secondary scale (6) is perpendicular to the plane of the main scale (1) as the origin of the main caliper; Step 102, during measurement, ensure that the right side surface of the measuring claw I (5) of the main scale vernier ruler (4) is in contact with the left working surface of the guardrail (2), the lower end surface of the measuring claw II (8) of the auxiliary ruler (6) is in contact with the position of the "gauge line" (901) of the base rail (9), the bubble of the bubble level (3) on the main scale vernier ruler (4) is located in the middle position, and the lower plane of the main scale vernier ruler (4) is in contact with the upper surface of the guardrail (2). The value read on the main scale vernier ruler (4) is the wheel flange groove size A of the frog guardrail; Among them, the steps of step 2 are: Step 201, taking the point where the plane of the main scale (1) and the plane of the secondary scale (6) are perpendicular as the origin of the secondary scale (6); Step 202, during measurement, ensure that the lower plane of the main scale vernier scale (4) on the main scale (1) is in contact with the upper surface of the guard rail (2), the bubble of the bubble level (3) on the main scale vernier scale (4) is located in the middle, the lower end surface of the measuring claw II (8) of the auxiliary scale (6) is in contact with the highest point of the base rail (9), and the value read on the auxiliary scale vernier scale (7) is the relative height difference B between the guard rail (2) and the base rail.

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