A device and method for measuring the leg thickness of a profiled steel

Abstract

The application provides a kind of section steel leg thick measuring device and measuring method, including main ruler, fixed ruler and vice ruler, wherein, the fixed ruler is connected with one end of the main ruler, the vice ruler is slidingly connected with the main ruler, and the main ruler is provided with a scale. The device can accurately measure the middle thickness of the leg of I-beam, channel steel and the like under different standards, and the accuracy can meet the standard requirements. The device has the advantages of simple structure, easy to use and reusable. It is easy to operate and beneficial to popularization.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of metallurgical machinery, in particular to a profile steel leg thickness measuring device and a measuring method. BACKGROUND

[0002] In GB_T 706-2016 standard, it is clearly stipulated that the allowable deviation of the leg middle thickness t of I-beam and channel steel is ±0.06t, which indicates that the leg middle thickness t is required as the delivery condition of I-beam and channel steel and has a clear tolerance requirement, Figure 1 is a sectional view of I-beam, and the leg middle thickness t of I-beam is the thickness at (b-d) / 4. Since the inner side wall of the leg of I-beam has a certain slope and the leg height b and the web thickness d fluctuate within a certain tolerance range, it is difficult to accurately position the (b-d) / 4 position during production and use. However, there is currently no device that can accurately measure the leg middle thickness t, and only estimation can be performed. Similarly, channel steel also has the above-mentioned problems. There is currently no device that can accurately measure the leg middle thickness t of I-beam and channel steel.

[0003] Therefore, there is a need for a profile steel leg thickness measuring device and a measuring method. SUMMARY

[0004] The present application aims to provide a profile steel leg thickness measuring device and a measuring method, which can accurately measure the leg middle thickness of profile steel, and the measuring accuracy can reach 0.02mm. Moreover, the device has the advantages of simple operation, easy learning and low cost.

[0005] In order to achieve the above-mentioned purpose, the present application provides the following technical solutions:

[0006] A profile steel leg thickness measuring device, comprising a main ruler, a fixed ruler and a secondary ruler, wherein the fixed ruler is connected with one end of the main ruler, the secondary ruler is in sliding connection with the main ruler, and the main ruler is provided with a scale.

[0007] Further, in the profile steel leg thickness measuring device, the secondary ruler comprises a sliding block, the sliding block is provided with a sliding groove, the main ruler can slide in the sliding groove, and the secondary ruler can freely slide on the main ruler through the sliding block; the sliding block is provided with a scale, and the zero scale of the sliding block can be aligned with the zero scale of the main ruler.

[0008] Further, in the above-mentioned profile steel leg thickness measuring device, the fixed ruler comprises a first fixed claw and a second fixed claw, one end of the first fixed claw is connected with the main ruler, the other end of the first fixed claw extends away from the main ruler, one end of the second fixed claw is connected with the main ruler, the other end of the second fixed claw extends away from the main ruler; the first fixed claw and the second fixed claw are respectively located on opposite sides of the main ruler, the auxiliary ruler further comprises a first moving claw and a second moving claw, one end of the first moving claw is connected with the sliding block, the other end of the first moving claw extends away from the main ruler, one end of the second moving claw is connected with the sliding block, the other end of the second moving claw extends away from the main ruler, the first moving claw and the second moving claw are respectively located on opposite sides of the main ruler.

[0009] Further, in the above-mentioned profile steel leg thickness measuring device, the first fixed claw and the first moving claw cooperate to measure the thickness of the root of the leg of the profile steel, the second fixed claw and the second moving claw cooperate to measure the thickness of the tip of the leg of the profile steel, and the thickness of the root of the leg and the thickness of the tip of the leg of the profile steel can be used to calculate the intermediate thickness of the leg of the profile steel; the profile steel comprises an I-beam and a channel steel.

[0010] Further, in the above-mentioned profile steel leg thickness measuring device, the inner side surface of the first fixed claw is perpendicular to the axis of the main ruler, and the inner side surface of the first moving claw is inclinedly arranged away from the first fixed claw; a plurality of first grooves are sequentially arranged on the inner side surface of the first fixed claw from one end to the other end of the first fixed claw, the depth of the plurality of first grooves from one end to the other end of the first fixed claw gradually decreases, and the plurality of first grooves form a sawtooth structure for the first fixed claw; a plurality of second grooves are sequentially arranged on the inner side surface of the first moving claw from one end to the other end of the first moving claw, the depth of the plurality of second grooves from one end to the other end of the first moving claw gradually decreases, and the plurality of second grooves form a sawtooth structure for the first moving claw; the sawtooth-shaped first fixed claw can be engaged with the sawtooth-shaped first moving claw, and after the first fixed claw and the first moving claw are engaged with each other, the zero scale on the sliding block can be aligned with the zero scale on the main ruler.

[0011] Further, in the above-mentioned profile steel leg thickness measuring device, the inner side surface of the second fixed claw is perpendicular to the axis of the main ruler, the inner side surface of the second moving claw is inclinedly arranged away from the second fixed claw, and the inner side surface of the second moving claw is consistent with the slope of the inner side surface of the first moving claw.

[0012] Further, in the profile steel leg thickness measuring device, the slope of the inner side surface of the first moving claw is one of 1:6, 1:10, 5:100 and 8:100; and the slope of the inner side surface of the second moving claw is one of 1:6, 1:10, 5:100 and 8:100.

[0013] Further, in the profile steel leg thickness measuring device, the other end of the first moving claw is designed with a round corner.

[0014] Further, in the profile steel leg thickness measuring device, the other end of the first moving claw is designed with a round corner.

[0015] On the other hand, a method for measuring the profile steel leg thickness by using the profile steel leg thickness measuring device is provided, comprising the following steps:

[0016] 1) Check the zero position of the device, slide the secondary ruler to the end of the primary ruler close to the fixed ruler, make the secondary ruler and the primary ruler engage with each other, check whether the zero scale on the primary ruler is aligned with the zero scale on the sliding block, if yes, proceed to the measurement work, if not, proceed to the calibration;

[0017] 2) Measure the thickness t1 of the leg root of the profile steel, place the leg of the profile steel between the first moving claw and the first fixed claw, position the leg root of the profile steel by using the plane of the first moving claw, position the inclined surface of the inner side of the leg of the profile steel by using the inner side surface of the first moving claw, translate the primary ruler to make the first fixed claw of the primary ruler adhere to the outer side surface of the leg of the profile steel, and the reading on the primary ruler is the thickness t1 of the leg root position of the profile steel;

[0018] 3) Measure the thickness t2 of the leg tip of the profile steel, place the leg of the profile steel between the second moving claw and the second fixed claw, adhere the leg tip of the profile steel to the primary ruler, adhere the inner side surface of the second fixed claw to the outer side surface of the leg of the profile steel, translate the secondary ruler to make the inner side surface of the second moving claw adhere to the inclined surface of the inner side of the leg tip of the profile steel, and the reading on the primary ruler is the thickness t2 of the leg tip position of the profile steel;

[0019] 4) Calculate the middle thickness t of the leg of the profile steel, the middle thickness t of the leg of the profile steel = (t1+t1) / 2.

[0020] It can be seen that the profile steel leg thickness measuring device and the measuring method can accurately measure the middle thickness of the leg of the I-shaped steel, channel steel and the like with non-parallel outer side surface and inner side surface under different standards, and the accuracy can meet the standard requirements; the device has the advantages of simple structure, convenient use and reusability; the operation is simple and easy to implement, and is beneficial to popularization. BRIEF DESCRIPTION OF DRAWINGS

[0021] The accompanying drawings, which form a part of this specification, are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification. The drawings illustrate one illustrative embodiment of the application and, together with the description, serve to explain the application.

[0022] Figure 1 Fig. 1 is a schematic view of a I-beam cross-section structure.

[0023] Figure 2 Fig. 2 is a schematic view of a structure of an embodiment of the present application.

[0024] Figure 3 Fig. 3 is a schematic view of a structure of a main ruler and a fixed ruler of an embodiment of the present application;

[0025] Figure 4 Fig. 4 is a schematic view of a structure of a sub ruler of an embodiment of the present application;

[0026] Figure 5 Fig. 5 is a schematic view of a structure of measuring the position of a root of a leg of a I-beam of an embodiment of the present application;

[0027] Figure 6 Fig. 6 is a schematic view of a structure of measuring the position of a tip of a leg of a I-beam of an embodiment of the present application;

[0028] BRIEF DESCRIPTION OF DRAWINGS 1 steel; 11 web; 12 leg; 2 main ruler; 3 fixed ruler; 31 first fixed claw; 32 second fixed claw; 33 first recess; 4 sub ruler; 41 sliding block; 42 first moving claw; 43 second moving claw; 44 second recess; 45 third recess; 46 sliding groove. DETAILED DESCRIPTION

[0029] The application will be described in detail with reference to the drawings, wherein the following examples are provided as illustrative embodiments of the application. It will be apparent, however, that modifications and variations can be made to the application without departing from the scope or spirit of the application. For example, features that are shown or described as part of one embodiment can be used on another embodiment to produce still a further embodiment. It is, therefore, desired to be secured to the proper scope of the application as encompassed by the appended claims and their equivalents.

[0030] In the description of the present application, the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and do not require the present application to be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. The terms "connected", "connected", "provided" used in the present application should be understood broadly, for example, it can be fixedly connected or detachably connected; it can be directly connected or indirectly connected through an intermediate part; it can be wired electrical connection, wireless electrical connection or wireless communication signal connection, and the specific meaning of the above terms can be understood by those skilled in the art according to the specific circumstances.

[0031] One or more examples of the present application are shown in the accompanying drawings. The detailed description uses numerical and letter designations to refer to features in the drawings. Like or similar designations in the drawings and description have been used to label like or similar parts of the present application. As used herein, the terms "first", "second", and "third", etc. are used interchangeably to distinguish one component from another and are not intended to signify location or importance of the individual components.

[0032] As shown in Figures 1 to 6 According to an embodiment of the present application, a profile steel leg thickness measuring device is provided, as shown in Figure 2 including a main ruler 2, a fixed ruler 3 and a secondary ruler 4, wherein the fixed ruler 3 is connected with one end of the main ruler 2, the secondary ruler 4 is slidingly connected with the main ruler 2, and the main ruler 2 is provided with a scale 5. As shown in Figure 1 The profile steel 1 is composed of a web 11 and two legs 12, the two legs 12 are respectively located on both sides of the web 11 and are connected with the web 11, the outer side of the leg 12 of the profile steel 1 is a plane, and the inner side has a certain slope. The device can measure the thickness of the leg root position and the leg tip position of the profile steel 1 respectively, and further can obtain the middle thickness of the leg 12 of the profile steel 1 by calculation. The device has the advantages of simple operation, easy learning and low cost.

[0033] Further, as shown in Figure 4 The secondary ruler 4 includes a sliding block 41, the sliding block 41 is provided with a sliding groove 46, the main ruler 2 can slide in the sliding groove 46, and the secondary ruler 4 can freely slide on the main ruler 2 through the sliding block 41; the sliding block 41 is provided with a scale 5, and the zero scale of the sliding block 41 can be aligned with the zero scale of the main ruler 2. Such arrangement can facilitate the measurement of the thickness of the leg root position and the leg tip position of the profile steel 1.

[0034] Further, as shown in Figure 3As shown, the fixed ruler 3 comprises a first fixed claw 31 and a second fixed claw 32, the first fixed claw 31, the second fixed claw 32 and the main ruler 2 are of an integral structure, one end of the first fixed claw 31 is connected with the main ruler 2, the other end of the first fixed claw 31 extends away from the main ruler 2, one end of the second fixed claw 32 is connected with the main ruler 2, the other end of the second fixed claw 32 extends away from the main ruler 2; the first fixed claw 31 and the second fixed claw 32 are respectively located at opposite sides of the main ruler 2. Figure 4 As shown, the sub ruler 4 further comprises a first moving claw 42 and a second moving claw 43, the sliding block 41, the first moving claw 42 and the second moving claw 43 are of an integral structure, one end of the first moving claw 42 is connected with the sliding block 41, the other end of the first moving claw 42 extends away from the main ruler 2, one end of the second moving claw 43 is connected with the sliding block 41, the other end of the second moving claw 43 extends away from the main ruler 2, the first moving claw 42 and the second moving claw 43 are respectively located at opposite sides of the main ruler 2. The first fixed claw 31 and the first moving claw 42 can cooperate to measure the thickness t1 of the leg root position of the profile steel 1, the leg root of the profile steel 1 refers to the position of the connection between the web plate 11 and the leg 12, the second fixed claw 32 and the second moving claw 43 can cooperate to measure the thickness t2 of the leg tip position of the profile steel 1, the leg tip of the profile steel 1 refers to the end of the leg 12 away from the web plate 11, the thickness of the leg root position and the thickness of the leg tip position of the profile steel 1 can be used to calculate the middle thickness of the leg 12 of the profile steel 1, the middle thickness t of the leg of the profile steel 1 is (t1+t1) / 2; the profile steel 1 comprises I-beams and channel steels and other double-side non-parallel profile steels.

[0035] Further, the inner side surface of the first fixed claw 31 is perpendicular to the axis of the main ruler 2, and the inner side surface of the first fixed claw 31 refers to the surface adjacent to the first moving claw 42, and such arrangement can ensure that the first fixed claw 31 and the outer side surface of the leg of the profile steel 1 are fitted, and the measurement accuracy is ensured. The inner side surface of the first moving claw 42 is arranged to be inclined away from the first fixed claw 31, and the inner side surface of the first moving claw 42 refers to the surface adjacent to the first fixed claw 31, and such arrangement can make the inner side surface of the first moving claw 42 with the slope of the profile steel 1 fitted, and the measurement accuracy is ensured. A plurality of first grooves 33 are arranged on the inner side surface of the first fixed claw 31 from one end to the other end of the first fixed claw 31, and the depth of the plurality of first grooves 33 from one end to the other end of the first fixed claw 31 gradually decreases, and the plurality of first grooves 33 make the first fixed claw 31 form a sawtooth structure; a plurality of second grooves 44 are arranged on the inner side surface of the first moving claw 42 from one end to the other end of the first moving claw 42, and the depth of the plurality of second grooves 44 from one end to the other end of the first moving claw 42 gradually decreases, and the plurality of second grooves 44 make the first moving claw 42 form a sawtooth structure; the sawtooth first fixed claw 31 can be engaged with the sawtooth first moving claw 42, and when the first fixed claw 31 and the first moving claw 42 are engaged with each other, the zero scale on the sliding block 41 can be aligned with the zero scale on the main ruler 2. The first fixed claw 31 and the first moving claw 42 are both sawtooth structures, which ensures that the first moving claw 42 has the required slope, and at the same time ensures that the measurement of the thickness t1 of the leg root of the profile steel 1 starts from the zero scale of the main ruler 2. When measuring the thickness of the leg root position of the profile steel 1, the leg 12 of the profile steel 1 is placed between the first fixed claw 31 and the first moving claw 42, the other end of the first moving claw 42 is fitted with the web 11 of the profile steel 1, the outer side surface of the leg 12 of the profile steel 1 is fitted with the inner side surface of the first fixed claw 31, and the inner side surface of the leg 12 of the profile steel 1 is fitted with the inner side surface of the first moving claw 42, at this time, the reading on the main ruler 2 corresponding to the zero scale 5 on the sliding block 41 is the thickness of the leg tip position of the profile steel 1.

[0036] Further, the inner side surface of the second fixed claw 32 is perpendicular to the axis of the main ruler 2, the inner side surface of the second fixed claw 32 refers to the surface close to the second moving claw 43, the inner side surface of the second moving claw 43 is arranged in a direction away from the second fixed claw 32, the inner side surface of the second moving claw 43 refers to the surface close to the second fixed claw 32, and the inner side surface of the second moving claw 43 is consistent with the slope of the inner side surface of the first moving claw 42. When measuring the thickness of the leg tip position of the profile steel 1, the leg 12 of the profile steel 1 is placed between the second fixed claw 32 and the second moving claw 43, the leg tip of the profile steel 1 is attached to the main ruler 2, the outer side surface of the leg 12 of the profile steel 1 is attached to the inner side surface of the second fixed claw 32, and the inner side surface of the leg 12 of the profile steel 1 is attached to the inner side surface of the second moving claw 43. At this time, the reading on the main ruler 2 corresponding to the zero scale on the sliding block 41 is the thickness of the leg tip position of the profile steel 1.

[0037] Further, the device includes a plurality of main rulers 2 and a plurality of auxiliary rulers 4, the lengths of the plurality of main rulers 2 are all different, and different lengths of the main rulers 2 are selected according to the length of the measured profile steel 1; the slopes of the first moving claw 42 and the second moving claw 43 of each auxiliary ruler 4 correspond to the slope of one type of profile steel respectively. The slopes of the inner side surfaces of the first moving claw 42 and the second moving claw 43 of the auxiliary ruler 4 meet the slopes of I-shaped steel and channel steel of various standards such as national standard, British standard, European standard, American standard and Russian standard, the auxiliary ruler 4 is selected according to the slope of the measured profile steel, preferably, the slope of the inner side surface of the first moving claw 42 of the auxiliary ruler 4 is one of 1:6, 1:10, 5:100 and 8:100, and the slope of the inner side surface of the second moving claw 43 is one of 1:6, 1:10, 5:100 and 8:100, and when measuring, the first moving claw 42 and the second moving claw 43 with the same slope of the auxiliary ruler 4 are selected according to the slope of the leg 12 of the measured profile steel 1. Such arrangement can measure the middle thickness of the leg 12 of I-shaped steel or channel steel meeting various standards such as national standard, British standard, European standard, American standard and Russian standard by using the device, and the model of the measured profile steel 1 can cover all types of I-shaped steel or channel steel in GB_T 706-2016 standard. For example, the 1:6 slope is selected for measuring national standard I-shaped steel, the 1:10 slope is selected for measuring national standard channel steel, and the 5:100 or 8:100 slope is selected for measuring European standard channel steel.

[0038] Further, the other end of the first moving claw 42 is designed with a rounded corner, which can prevent interference with the measured profile steel 1 during measurement.

[0039] Furthermore, the other end of the first moving claw 42 is a flat surface. When measuring the thickness of the 12 legs of the steel section 1, the flat surface of the other end of the first moving claw 42 fits against the web 11 of the steel section 1, making the measurement more accurate. A third groove 45 is provided on the other end of the first moving claw 42. When there is unevenness on the surface of the web 11, the two side walls forming the third groove 45 fit against the web 11, which can improve the measurement accuracy.

[0040] The present invention also discloses a method for measuring the thickness of steel leg using the above-mentioned steel leg thickness measuring device, comprising the following steps:

[0041] 1) Check the zero position of the device. Slide the auxiliary scale 4 to the end of the main scale 2 that is close to the fixed scale 3 so that the auxiliary scale 4 and the main scale 2 mesh with each other. Check whether the zero mark on the main scale 2 is aligned with the zero mark on the slider 41. If they are aligned, perform the measurement work. If they are not aligned, perform the calibration.

[0042] 2) such as Figure 5 As shown, to measure the thickness t1 at the leg root position of the steel profile 1, the leg 12 of the steel profile 1 is placed between the first moving claw 42 and the first fixed claw 31. The plane of the first moving claw 42 is used to position the leg root position of the steel profile 1, that is, the other end of the first moving claw 42 (the free end of the first moving claw 42) is in contact with the web 11 of the steel profile 1. The inner side of the first moving claw 42 is used to position the inclined surface of the inner side of the leg 12 of the steel profile 1, that is, the inner side of the first moving claw 42 is in contact with the inner side of the leg 12 of the steel profile 1. The main scale 2 is translated so that the first fixed claw 31 of the main scale 2 is in contact with the outer side of the leg 12 of the steel profile 1. The reading on the main scale 2 corresponding to the zero mark 5 of the slider 41 is the thickness t1 at the leg root position of the steel profile 1.

[0043] 3) such as Figure 6 As shown, to measure the thickness t2 of the leg tip of the steel profile 1, place the leg 12 of the steel profile 1 between the second moving claw 43 and the second fixed claw 32, align the leg tip of the steel profile 1 with the main scale 2, align the inner side of the second fixed claw 32 with the outer side of the leg 12 of the steel profile 1, and translate the auxiliary scale 4 so that the inner side of the second moving claw 43 aligns with the inner side of the leg tip of the steel profile 1. The reading on the main scale 2 corresponding to the zero mark of the slider 41 is the thickness t2 at the leg tip position of the steel profile 1.

[0044] 4) Calculate the intermediate thickness t of leg 12 of section steel 1. The intermediate thickness t of leg 12 of section steel 1 is (t1+t1) / 2.

[0045] As can be seen from the above description, the embodiments of the present invention achieve the following technical effects:

[0046] The present application discloses a kind of steel leg thickness measuring device and measuring method, using the device can accurately measure the middle thickness of the leg 12 of I-beam, channel steel etc.

[0047] The above description is only preferred embodiments of the present application and is not intended to limit the present application. Those skilled in the art can make various modifications and changes to the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A device for measuring the leg thickness of a section bar, characterized by The device comprises a main ruler, a fixed ruler and a sub-ruler, wherein, the fixed ruler is connected with one end of the main ruler, and the sub-ruler is slidingly connected with the main ruler, and the main ruler is provided with a scale, the sub-ruler comprises a sliding block, and the sub-ruler can freely slide on the main ruler through the sliding block; the sliding block is provided with a scale, and the zero scale of the sliding block can be aligned with the zero scale of the main ruler, the fixed ruler comprises a first fixed claw and a second fixed claw, and the first fixed claw and the second fixed claw are respectively located on opposite sides of the main ruler, the sub-ruler further comprises a first moving claw and a second moving claw, and the first moving claw and the second moving claw are respectively located on opposite sides of the main ruler, the first fixed claw and the first moving claw cooperate to measure the thickness of the leg root of the profile steel, the second fixed claw and the second moving claw cooperate to measure the thickness of the leg tip of the profile steel, the intermediate thickness of the leg of the profile steel can be calculated through the thickness t1 of the leg root and the thickness t2 of the leg tip of the profile steel, i.e. t=(t1+t2) / 2; the inner side surface of the first fixed claw is perpendicular to the axis of the main ruler, and the inner side surface of the first moving claw is obliquely arranged away from the first fixed claw; a plurality of first grooves are sequentially arranged on the inner side surface of the first fixed claw from one end to the other end of the first fixed claw, the depth of the plurality of first grooves from one end to the other end of the first fixed claw gradually decreases, and the plurality of first grooves form a sawtooth structure for the first fixed claw; a plurality of second grooves are sequentially arranged on the inner side surface of the first moving claw from one end to the other end of the first moving claw, the depth of the plurality of second grooves from one end to the other end of the first moving claw gradually decreases, and the plurality of second grooves form a sawtooth structure for the first moving claw; the sawtooth-shaped first fixed claw can be engaged with the sawtooth-shaped first moving claw, and when the first fixed claw and the first moving claw are engaged with each other, the zero scale on the sliding block can be aligned with the zero scale on the main ruler, the inner side surface of the second fixed claw is perpendicular to the axis of the main ruler, and the inner side surface of the second moving claw is obliquely arranged away from the second fixed claw, the slope of the inner side surface of the second moving claw is consistent with that of the inner side surface of the first moving claw.

2. The profile steel leg thickness measuring device according to claim 1, wherein, a sliding groove is arranged on the sliding block, and the main ruler can slide in the sliding groove.

3. The profile steel leg thickness measuring device according to claim 1, wherein, one end of the first fixed claw is connected with the main ruler, and the other end of the first fixed claw extends away from the main ruler, one end of the second fixed claw is connected with the main ruler, and the other end of the second fixed claw extends away from the main ruler.

4. The profile steel leg thickness measuring device according to claim 1, wherein, One end of the first mobile claw is connected with the slider, the other end of the first mobile claw extends away from the main ruler, one end of the second mobile claw is connected with the slider, the other end of the second mobile claw extends away from the main ruler.

5. The profile steel leg thickness measuring device according to claim 1, wherein, The profile steel comprises an I-beam or a channel steel.

6. The profile steel leg thickness measuring device according to claim 1, wherein, The slope of the inner side surface of the first mobile claw and the slope of the inner side surface of the second mobile claw are one of 1:6, 1:10, 5:100 and 8:

100.

7. The profile steel leg thickness measuring device according to claim 1, wherein, The other end of the first mobile claw is designed with a round corner.

8. The profile steel leg thickness measuring device according to claim 7, wherein, The other end of the first mobile claw is a flat surface, and the other end of the first mobile claw is provided with a third groove.

9. A method of measuring the leg thickness of a profiled steel sheet using the profiled steel sheet leg thickness measuring device according to claim 8, characterized by, The method comprises the following steps: 1) checking the zero position of the device, sliding the secondary ruler to the end of the main ruler close to the fixed ruler, making the secondary ruler and the main ruler engage with each other, checking whether the zero scale on the main ruler is aligned with the zero scale on the slider, if so, performing the measurement work, if not, performing the calibration; 2) measuring the thickness t1 of the leg root of the profile steel, placing the leg of the profile steel between the first mobile claw and the first fixed claw, positioning the leg root position of the profile steel with the flat surface of the first mobile claw, positioning the inclined surface of the inner side of the leg of the profile steel with the inner side surface of the first mobile claw, making the first fixed claw of the main ruler fit the outer side surface of the leg of the profile steel, and the reading on the main ruler is the thickness t1 of the leg root position of the profile steel; 3) measuring the thickness t2 of the leg tip of the profile steel, placing the leg of the profile steel between the second mobile claw and the second fixed claw, fitting the leg tip of the profile steel with the main ruler, fitting the inner side surface of the second fixed claw with the outer side surface of the leg of the profile steel, making the inner side surface of the second mobile claw fit the inclined surface of the inner side of the leg tip of the profile steel, and the reading on the main ruler is the thickness t2 of the leg tip position of the profile steel; 4) calculating the middle thickness t of the leg of the profile steel, the middle thickness t of the leg of the profile steel = (t1 + t2) / 2.

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