Concave-convex deformation measuring instrument and measuring method thereof

Abstract

The invention belongs to the technical field of measuring instruments, and particularly relates to a concave-convex deformation measuring instrument and a measuring method thereof.The concave-convex deformation measuring instrument comprises a bump outer diameter measuring unit, a bump height measuring unit, a concave depth measuring unit, a base, a control mainboard, a touch screen and a shell unit, the bump outer diameter measuring unit, the bump height measuring unit, the recess depth measuring unit and the control mainboard are all arranged on the base, and the bump outer diameter measuring unit, the bump height measuring unit, the recess depth measuring unit and the touch screen are all electrically connected with the control mainboard. The invention provides a structure, a principle and a method for measuring the bump size, the height, the recess size, the depth, the pipeline diameter, the circumference, the radian and the like of the special equipment, various sizes of surface deformation of the special equipment can be accurately and conveniently measured, and the production and inspection efficiency of the special equipment is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of measuring instruments, and particularly relates to a concave-convex deformation measuring instrument and a measuring method thereof. Background Art

[0002] Special equipment includes eight categories such as boilers, pressure vessels, pressure pipelines, elevators, and lifting machinery. Special equipment is closely related to the safety of people's production and life. All links of the design, manufacture, use, repair, and transformation of special equipment are supervised, and supervision and inspection and regular inspection are carried out. During the operation of special equipment, defects such as bulging, denting, and swelling may occur, and these defects are usually caused by various factors. First, improper operating conditions may cause the equipment to be overloaded or unevenly stressed, resulting in surface protrusions or depressions. For example, thermal expansion in a high-temperature environment or uneven distribution of medium pressure may cause deformation of the equipment surface. Second, the quality of the material itself and the processing technology are crucial for the formation of surface defects of the equipment. For example, insufficient heat treatment of the material or errors during the processing may cause swelling or depression on the equipment surface. In addition, the design structure and manufacturing quality of the equipment directly affect its pressure resistance and stability. Unreasonable design or manufacturing defects may lead to bulging or denting problems on the equipment surface.

[0003] For these defects, accurate measurement and analysis are the key. Using high-precision measuring equipment can quickly and accurately detect and record the bulging, denting, and swelling conditions on the equipment surface, helping operators identify problems in a timely manner and take repair measures to ensure the safe operation and long-term reliability of the equipment. By deeply analyzing the occurrence of these defects in special equipment, the material selection, processing technology, and equipment design can be optimized, thereby improving the compressive capacity and service life of the equipment and ensuring its stable operation under various working conditions.

[0004] For example, a bulging measuring instrument proposed in Application No. CN204694207U needs to fix a guide rail on the surface to be measured, and the bracket needs to be manually moved during the measurement process, which greatly affects the operation process and operation efficiency.

[0005] Application No. CN216954323U proposes a bulging deformation size measuring instrument for pressure-bearing special equipment, which does not have the function of limiting the limiting rod. When measuring the height of the bulging of the equipment, if the hand shakes when the staff views the data, there will be errors when viewing the measurement data.

[0006] Application No. CN220366782U provides a bulging deformation size measuring instrument for pressure-bearing special equipment, with a relatively complex structure. Users need to be familiar with the operation of each component. Operating the limiting components may require a certain amount of force, which may affect the measurement efficiency. It may be difficult to achieve precise measurement for irregularly shaped bulges.

[0007] Moreover, the above-mentioned defect measuring instrument in the prior art needs to be manually moved and read by the naked eye, which is troublesome to operate and has low accuracy. In actual use, due to human error, the position, height or depth distribution of the bulge or depression does not conform to the actual situation.

[0008] Therefore, how to provide a concave-convex deformation measuring instrument with high accuracy and convenient operation and its measuring method has become a problem that needs to be considered by those skilled in the art. Summary of the Invention

[0009] In view of the problems existing in the above-mentioned prior art, the present invention discloses a concave-convex deformation measuring instrument and its measuring method. The present invention can accurately measure the size and shape of the surface defects of pressure-bearing equipment, display and record real-time data. At the same time, the present invention is easy to operate and maintain, and is suitable for the complex environment of industrial production sites.

[0010] Specifically, the present application discloses the following technical solutions:

[0011] A concave-convex deformation measuring instrument includes a bulge outer diameter measuring unit, a bulge height measuring unit, a depression depth measuring unit, a base, a control main board, a touch screen and a housing unit. The base is fixed in the housing unit, the touch screen is arranged on the surface of the housing unit, the bulge outer diameter measuring unit, the bulge height measuring unit, the depression depth measuring unit and the control main board are all arranged on the base, and the bulge outer diameter measuring unit, the bulge height measuring unit, the depression depth measuring unit and the touch screen are all electrically connected to the control main board;

[0012] The bulging outer diameter measuring unit includes a bulging outer diameter measuring unit guide rail, a bulging outer diameter measuring unit slider, a bulging outer diameter sensing and measuring mechanism, a bulging outer diameter measuring unit jaw pusher, a bulging outer diameter measuring unit sensor fixing plate, a first bulging outer diameter measuring unit fork-shaped connecting rod, a second bulging outer diameter measuring unit fork-shaped connecting rod, a first bulging outer diameter measuring unit jaw, a second bulging outer diameter measuring unit jaw, and a bulging outer diameter measuring unit fixing plate. On one side of the surface of the base, a bulging outer diameter measuring unit guide rail fixing plate is vertically arranged. The bulging outer diameter measuring unit guide rail is arranged on the bulging outer diameter measuring unit guide rail fixing plate. The bulging outer diameter measuring unit slider is slidably arranged in the bulging outer diameter measuring unit guide rail. The bulging outer diameter measuring unit sensor fixing plate is arranged on the bulging outer diameter measuring unit slider. The bulging outer diameter sensing and measuring mechanism is respectively arranged on the bulging outer diameter measuring unit sensor fixing plate and the base. The bulging outer diameter measuring unit jaw pusher passes through the long hole on the right side of the housing unit and is arranged on the side of the bulging outer diameter measuring unit sensor fixing plate. The end of the bulging outer diameter measuring unit jaw pusher is provided with a bulging outer diameter measuring unit pusher module. One ends of the first bulging outer diameter measuring unit fork-shaped connecting rod and the second bulging outer diameter measuring unit fork-shaped connecting rod are hinged to the bulging outer diameter measuring unit sensor fixing plate through a first pin shaft. The other end of the first bulging outer diameter measuring unit fork-shaped connecting rod is hinged to the top of the first bulging outer diameter measuring unit jaw through a second pin shaft. The other end of the second bulging outer diameter measuring unit fork-shaped connecting rod is hinged to the top of the second bulging outer diameter measuring unit jaw through a third pin shaft. The bulging outer diameter measuring unit fixing plate is horizontally arranged at the tail end of the base. The middle parts of the first bulging outer diameter measuring unit jaw and the second bulging outer diameter measuring unit jaw are hinged to the bulging outer diameter measuring unit fixing plate through a fourth pin shaft. The clamping ends of the first bulging outer diameter measuring unit jaw and the second bulging outer diameter measuring unit jaw are both in a circular arc shape bent inward.

[0013] Further, the first bulging outer diameter measuring unit fork-shaped connecting rod and the second bulging outer diameter measuring unit fork-shaped connecting rod have the same length. The length of the first bulging outer diameter measuring unit jaw between the second pin shaft and the fourth pin shaft is the same as the length of the second bulging outer diameter measuring unit jaw between the third pin shaft and the fourth pin shaft.

[0014] Further, the bulging outer diameter sensing and measuring mechanism includes a bulging outer diameter measuring unit fixed grating, a bulging outer diameter measuring unit fixed grating fixing plate, and a bulging outer diameter measuring unit moving grating. The bulging outer diameter measuring unit fixed grating fixing plate is installed on the base along the direction of the guide rail. The bulging outer diameter measuring unit fixed grating is installed in the bulging outer diameter measuring unit fixed grating fixing plate. The bulging outer diameter measuring unit moving grating is correspondingly installed on the bulging outer diameter measuring unit sensor fixing plate opposite to the bulging outer diameter measuring unit fixed grating.

[0015] Furthermore, the housing unit includes an upper housing and a lower housing. The upper housing is covered on the lower housing. Long holes for adjustment are provided on both sides and the bottom of the housing unit. A relief hole for the protrusion outer diameter measuring unit, the protrusion height measuring unit, and the depression depth measuring unit to extend is provided at the front end of the housing.

[0016] Furthermore, the protrusion height measuring unit includes a protrusion height measuring scale, a protrusion height measuring scale connecting block, a protrusion height measuring scale sliding connecting block, a protrusion height measuring scale dial connecting block, a protrusion height measuring scale dial, a protrusion height sensing and measuring mechanism, a protrusion height measuring scale guide rail, and a protrusion height measuring scale slider. On the other side of the surface of the base, a protrusion height measuring unit guide rail fixing plate is vertically provided. The protrusion height measuring scale guide rail is fixed on the protrusion height measuring unit guide rail fixing plate. The protrusion height measuring scale slider is slidably arranged on the protrusion height measuring scale guide rail. The protrusion height measuring scale sliding connecting block is fixed on the protrusion height measuring scale slider. The protrusion height measuring scale connecting block is fixed on the protrusion height measuring scale sliding connecting block. The protrusion height measuring scale is fixed on the protrusion height measuring scale connecting block. The protrusion height measuring scale is in a T shape. The protrusion height measuring scale dial connecting block is fixed on one side of the protrusion height measuring scale sliding connecting block. The protrusion height measuring scale dial passes through the long hole on the left side of the housing unit and is fixed on the protrusion height measuring scale dial connecting block.

[0017] Furthermore, the protrusion height sensing and measuring mechanism includes a protrusion height measuring scale moving grating, a protrusion height measuring scale fixed grating mounting plate, and a protrusion height measuring scale fixed grating. The protrusion height measuring scale fixed grating mounting plate is installed on the base along the direction of the guide rail. The protrusion height measuring scale fixed grating is installed in the protrusion height measuring scale fixed grating mounting plate. The protrusion height measuring scale moving grating is correspondingly installed on the protrusion height measuring scale sliding connecting block opposite to the protrusion height measuring scale fixed grating.

[0018] Furthermore, the depression depth measuring unit includes a depth measuring scale U-shaped slider, a depth measuring scale clamping plate, a depth measuring rod, a depth sensing and measuring mechanism, and a depth measuring scale dial. The protrusion height measuring scale is provided with a limiting through groove with one end open. The depth measuring rod is slidably arranged in the limiting through groove. The end of the depth measuring rod is fixed on the depth measuring scale clamping plate. The depth sensing and measuring mechanism is arranged in the depth measuring scale U-shaped slider and the protrusion height measuring scale. The depth measuring scale U-shaped slider is covered on the depth measuring scale clamping plate. A chute is formed between the depth measuring scale clamping plate and the depth measuring scale U-shaped slider to enable the protrusion height measuring scale to move relatively between the two. A depression depth measuring unit groove is provided in the middle of the base. The depth measuring scale dial passes through the long hole at the bottom of the housing unit and the depression depth measuring unit groove and is fixed on the depth measuring scale U-shaped slider.

[0019] Further, the depth sensing measurement mechanism includes a depth measurement scale fixed grating, a depth measurement scale moving grating, and a depth measurement scale moving grating adjusting plate. The depth measurement scale fixed grating is fixed on the bulge height measurement scale. The depth measurement scale moving grating adjusting plate is fixed in the depth measurement scale U-shaped slider. The depth measurement scale moving grating is fixed on the depth measurement scale moving grating adjusting plate.

[0020] A measurement method for a concave-convex deformation measuring instrument includes the following measurement steps:

[0021] Realization of outer length measurement: First step, align the two bulge outer diameter measurement jaws, press the "Power On Button" on the touch screen to turn on the machine, and press the "Reset" button to zero. Second step, place the two bulge outer diameter measurement jaws at both ends of the object to be measured respectively, press the "Save Data" button to lock the screen value, and press the "Outer Length" button and the "Save Data" button to separately lock and display the outer length value;

[0022] Realization of inner length measurement: First step, align the two bulge outer diameter measurement jaws, press the "Power On Button" on the touch screen to turn on the machine, and press the "Reset" button to zero. Second step, place the two bulge outer diameter measurement jaws at both ends inside the object to be measured respectively, press the "Save Data" button to lock the screen value, or press the "Inner Length" button and the "Save Data" button to separately lock and display the inner length value;

[0023] Realization of height measurement: First step, align the bottoms of the two bulge outer diameter measurement jaws and the bulge height measurement scale, press the "Power On Button" on the touch screen to turn on the machine, and press the "Reset" button to zero. Second step, open the two bulge outer diameter measurement jaws and fix the jaws through the jaw dial of the bulge outer diameter measurement unit, so that the two bulge outer diameter measurement jaws are respectively placed on both sides of the object to be measured. Place the bottom of the bulge height measurement scale at the highest point of the object to be measured, press the "Save Data" button to lock the screen value, or press the "Height" button and the "Save Data" button to separately lock and display the height value;

[0024] Realization of depth measurement: First step, extend the bulge height measurement scale, turn the depth measurement scale dial to make the bottom end of the depth measurement rod flush with the bottom end of the bulge height measurement scale, press the "Power On Button" on the touch screen to turn on the machine, and press the "Reset" button to zero. Second step, open the two bulge outer diameter measurement jaws and fix the jaws through the jaw dial of the bulge outer diameter measurement unit, so that the two bulge outer diameter measurement jaws are respectively placed on both sides of the object to be measured. Place the bottom end of the depth measurement rod at the lowest point of the object to be measured, press the "Save Data" button to lock the screen value, or press the "Depth" button and the "Save Data" button to separately lock and display the depth value;

[0025] Realization of outer diameter measurement: First step, align the bottoms of the two outer diameter measurement jaws for bulges and the bulge height measurement ruler, press the "Power On Button" on the touch screen to turn on the machine, and press the "Reset" button to zero; Second step, open the two outer diameter measurement jaws for bulges and fix the jaws through the jaw dial of the outer diameter measurement unit for bulges, place the two outer diameter measurement jaws for bulges on both sides of the circle to be measured respectively, place the bottom end of the bulge height measurement ruler on the circle to be measured, press the "Save Data" button to lock the screen value, or press the "Outer Diameter" button and the "Save Data" button to lock the displayed outer diameter value separately;

[0026] Realization of inner diameter measurement: First step, extend the bulge height measurement ruler, turn the depth measurement ruler dial to make the bottom end of the depth measurement rod flush with the bottom end of the bulge height measurement ruler, press the "Power On Button" on the touch screen to turn on the machine, and press the "Reset" button to zero; Second step, open the two outer diameter measurement jaws for bulges and fix the jaws through the jaw dial of the outer diameter measurement unit for bulges, place the two outer diameter measurement jaws for bulges on both sides of the circle to be measured respectively, place the bottom end of the depth measurement rod on the circle to be measured, press the "Save Data" button to lock the screen value, or press the "Inner Diameter" button and the "Save Data" button to lock the displayed inner diameter value separately.

[0027] The beneficial effects of the present invention are as follows:

[0028] 1. The present invention takes the most basic bulges, depressions, bulging thickening, etc. in the deformation of special equipment as the measurement objects, integrates functions such as outer diameter measurement of bulges, bulge height measurement, and depression depth measurement, which not only reduces the cumbersome operations of multi - ruler measurement by measurement personnel, but also increases portability;

[0029] 2. The core functions of the present invention, such as outer diameter measurement of bulges, bulge height measurement, and depression depth measurement, all adopt mechanical structure design. By adopting high - precision mechanical processing methods and assembly methods, it can ensure the accuracy during long - term measurement, guarantee the correctness of measurement results, and provide a scientific analysis basis for subsequent operations of operation and maintenance personnel on related equipment;

[0030] 3. The operations of outer diameter measurement of bulges, bulge height measurement, and depression depth measurement of the present invention are independent of each other, which greatly facilitates the standardized measurement operations in different scenarios. At the same time, this device can withstand the use and wear in the manufacturing environment, ensuring the service life. Description of the Drawings

[0031] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0032] Figure 2 It is a schematic diagram of the base of the present invention;

[0033] Figure 3 It is a schematic diagram of the outer diameter measurement unit for bulges of the present invention Figure 1 ;

[0034] Figure 4 Schematic diagram of the bulging outer diameter measurement unit of the present invention Figure 2 ;

[0035] Figure 5 Schematic diagram of the bulging height measurement unit of the present invention;

[0036] Figure 6 Front structural schematic diagram of the recess depth measurement unit of the present invention;

[0037] Figure 7 Back structural schematic diagram of the recess depth measurement unit of the present invention;

[0038] Figure 8 Schematic diagram of the housing unit of the present invention;

[0039] Figure 9 Schematic diagram of the bulging height measurement of the present invention;

[0040] Figure 10 Schematic diagram of the recess depth measurement of the present invention;

[0041] Figure 11 Operation flowchart of the measurement method in Embodiment 2 of the present invention;

[0042] Among them, 1 - base; 2 - bulge outer diameter measurement unit; 3 - bulge height measurement unit; 4 - depression depth measurement unit; 5 - housing unit; 6 - touch screen; 11 - guide hole for bulge height measurement unit; 12 - set screw hole for bulge height measurement unit; 13 - guide groove for bulge height measurement unit; 15 - fixing plate positioning member; 16 - slider positioning block for bulge height measurement unit; 17 - guide rail fixing plate for bulge height measurement unit; 18 - groove for depression depth measurement unit; 19 - slider positioning block for bulge outer diameter measurement unit; 110 - guide rail fixing plate for bulge outer diameter measurement unit; 111 - guide groove for bulge outer diameter measurement unit; 112 - guide hole for bulge outer diameter measurement unit; 113 - set screw hole for bulge outer diameter measurement unit; 21 - bulge outer diameter measurement guide rail; 22 - bulge outer diameter measurement slider; 23 - fixed grating for bulge outer diameter measurement unit; 24 - fixed grating fixing plate for bulge outer diameter measurement unit; 25 - moving grating for bulge outer diameter measurement unit; 26 - jaw dial for bulge outer diameter measurement; 27 - dial module for bulge outer diameter measurement; 28 - sensor fixing plate for bulge outer diameter measurement; 29 - first fork-shaped connecting rod for bulge outer diameter measurement; 210 - second fork-shaped connecting rod for bulge outer diameter measurement; 211 - first jaw for bulge outer diameter measurement unit; 212 - second jaw for bulge outer diameter measurement; 213 - fixing plate for bulge outer diameter measurement unit; 214 - first pin; 215 - second pin; 216 - third pin; 217 - fourth pin; 31 - bulge height measurement scale; 32 - connecting block for bulge height measurement scale; 33 - sliding connecting block for bulge height measurement scale; 34 - dial connecting block for bulge height measurement scale; 35 - dial for bulge height measurement scale; 36 - moving grating for bulge height measurement scale; 37 - fixed grating mounting plate for bulge height measurement scale; 38 - fixed grating for bulge height measurement scale; 39 - guide rail for bulge height measurement scale; 310 - slider for bulge height measurement scale; 41 - U-shaped slider for depth measurement scale; 42 - clamping plate for depth measurement scale; 43 - depth measurement rod; 44 - fixed grating for depth measurement scale; 45 - moving grating for depth measurement scale; 46 - moving grating adjusting plate for depth measurement scale; 47 - dial for depth measurement scale; 51 - lower part of the housing; 52 - upper part of the housing. Specific implementation mode

[0043] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0044] Embodiment 1

[0045] Referring to the attached Figures 1-10 , this embodiment provides a concave-convex deformation measuring instrument for detecting the deformation amount of special equipment, as Figure 1As shown in the figure, it includes a base 1, a bulge outer diameter measurement unit 2, a bulge height measurement unit 3, a depression depth measurement unit 4, a housing unit 5, a control main board, and a touch screen 6.

[0046] The bulge outer diameter measurement unit 2, the bulge height measurement unit 3, the depression depth measurement unit 4, and the control main board are all fixed on the base 1. As Figure 8 shown, the housing unit 5 includes an upper housing 51 and a lower housing 52. The upper housing 51 and the lower housing 52 of the housing unit 5 are fixedly connected together. The base 1 is fixedly connected to the lower housing 52. The touch screen 6 is installed on the surface of the upper housing 51. The bulge outer diameter measurement unit 2, the bulge height measurement unit 3, the depression depth measurement unit 4, and the touch screen 6 are all electrically connected to the control main board. In this embodiment, long holes for adjustment are provided on both sides and the bottom of the housing unit 5, and a relief hole for the bulge outer diameter measurement unit 2, the bulge height measurement unit 3, and the depression depth measurement unit 4 to extend out is provided at the front end of the housing.

[0047] As Figure 2 shown, the base 1 is provided with a bulge height measurement unit guide hole 11, a bulge height measurement unit set screw hole 12, a bulge height measurement unit guide groove 13 for the installation of the bulge height measurement unit 3, a fixing plate positioning member 15 for the positioning of the bulge outer diameter measurement unit 2, a bulge height measurement unit slider positioning block 16, a bulge height measurement unit guide rail fixing plate 17 for the installation and positioning of the bulge height measurement unit 3. A depression depth measurement unit groove 18 is provided in the middle of the base 1. A bulge outer diameter measurement unit slider positioning block 19, a bulge outer diameter measurement unit guide rail fixing plate 110, a bulge outer diameter measurement unit guide groove 111, a bulge outer diameter measurement unit guide hole 112, and a bulge outer diameter measurement unit set screw hole 113 are provided for the installation of the bulge outer diameter measurement unit 2.

[0048] Specifically, as Figures 3-4 shown, the bulge outer diameter measurement unit 2 includes a bulge outer diameter measurement guide rail 21, a bulge outer diameter measurement slider 22, a bulge outer diameter measurement unit fixed grating 23, a bulge outer diameter measurement unit fixed grating fixing plate 24, a bulge outer diameter measurement unit moving grating 25, a bulge outer diameter measurement jaw dial 26, a bulge outer diameter measurement dial module 27, a bulge outer diameter measurement unit sensor fixing plate 28, a bulge outer diameter measurement fork-shaped link one 29, a bulge outer diameter measurement fork-shaped link two 210, a bulge outer diameter measurement jaw one 211, a bulge outer diameter measurement jaw two 212, a bulge outer diameter measurement fixing plate 213, a pin one 214, a pin two 215, a pin three 216, and a pin four 217.

[0049] The outer diameter measurement guide rail 21 of the bulge is fixed on the guide rail fixing plate 110 of the outer diameter measurement unit of the bulge. The outer diameter measurement slider 22 of the bulge is slidably installed on the outer diameter measurement guide rail 21 of the bulge and moves along the outer diameter measurement guide rail 21 of the bulge. The fixed grating fixing plate 24 of the outer diameter measurement unit of the bulge is fixed on the base 1. The sensor fixing plate 28 of the outer diameter measurement unit of the bulge is L-shaped and fixed on the outer diameter measurement slider 22 of the bulge. The jaw dial 26 for measuring the outer diameter of the bulge passes through the long hole on one side of the housing unit 5 and is fixed on the outside of the sensor fixing plate 28 of the outer diameter measurement unit of the bulge. The dial module 27 for measuring the outer diameter of the bulge is fixed at the end of the jaw dial 26 for measuring the outer diameter of the bulge. The pin four 217 is fixed on the fixing plate 213 for measuring the outer diameter of the bulge. The first forked link 29 for measuring the outer diameter of the bulge and the second forked link 210 for measuring the outer diameter of the bulge rotate relative to the pin one 214. The first forked link 29 for measuring the outer diameter of the bulge and the first jaw 211 for measuring the outer diameter of the bulge rotate relative to the pin two 215. The first forked link 29 of the outer diameter measurement unit of the bulge and the second jaw 212 for measuring the outer diameter of the bulge rotate relative to the pin three 216. The first jaw 211 for measuring the outer diameter of the bulge and the second jaw 212 for measuring the outer diameter of the bulge rotate relative to the pin four 217. The clamping ends of the first jaw 211 for measuring the outer diameter of the bulge and the second jaw 212 for measuring the outer diameter of the bulge are both circular arcs bent inward. And the distance between the pin one 214 and the pin two 215 on the first forked link 29 for measuring the outer diameter of the bulge is equal to the distance between the pin one 214 and the pin three 216 on the second forked link 210 for measuring the outer diameter of the bulge. The distance between the pin two 215 and the pin four 217 on the first jaw 211 for measuring the outer diameter of the bulge is equal to the distance between the pin three 216 and the pin four 217 on the second jaw 212 for measuring the outer diameter of the bulge. The pin one 214, the pin two 215, the pin three 216, and the pin four 217 are parallel to each other. And the pin four 217 is fixed on the fixing plate 213 for measuring the outer diameter of the bulge. During the movement of the link mechanism formed by the first forked link 29 for measuring the outer diameter of the bulge, the second forked link 210 for measuring the outer diameter of the bulge, the first jaw 211 for measuring the outer diameter of the bulge, and the second jaw 212 for measuring the outer diameter of the bulge, the plane formed by the pin one 214 and the pin four 217 is parallel to the direction of the outer diameter measurement guide rail 21 of the bulge. At the same time, the direction of the fixed grating fixing plate 24 of the outer diameter measurement unit of the bulge is parallel to the direction of the outer diameter measurement guide rail 21 of the bulge.

[0050] The distance between the pin four 217 on the first jaw 211 for measuring the outer diameter of the bulge and the lowermost end on the first jaw 211 for measuring the outer diameter of the bulge is equal to the distance between the pin four 217 on the second jaw 212 for measuring the outer diameter of the bulge of the outer diameter measurement unit of the bulge and the lowermost end on the second jaw 212 for measuring the outer diameter of the bulge of the outer diameter measurement unit of the bulge.

[0051] Such as Figure 5As shown, the bulge height measurement unit 3 includes a bulge height measuring ruler 31, a bulge height measuring ruler connecting block 32, a bulge height measuring ruler sliding connecting block 33, a bulge height measuring ruler dial connecting block 34, a bulge height measuring ruler dial 35, a bulge height measuring ruler moving grating 36, a bulge height measuring ruler fixed grating mounting plate 37, a bulge height measuring ruler fixed grating 38, a bulge height measuring ruler guide rail 39, and a bulge height measuring ruler slider 310.

[0052] The bulge height measuring ruler guide rail 39 is fixed on the bulge height measurement unit guide rail fixing plate 17. The bulge height measuring ruler slider 310 is slidably limited on the bulge height measuring ruler guide rail 39. The bulge height measuring ruler sliding connecting block 33 is fixed on the bulge height measuring ruler slider 310. The bulge height measuring ruler dial connecting block 34 is fixed on the bulge height measuring ruler sliding connecting block 33. The bulge height measuring ruler dial 35 passes through the long hole on the left side of the housing unit 5 and is fixed on the bulge height measuring ruler dial connecting block 34. The bulge height measuring ruler connecting block 32 is fixed on the bulge height measuring ruler sliding connecting block 33. The bulge height measuring ruler 31 is fixed on the bulge height measuring ruler connecting block 32. The bulge height measuring ruler moving grating 36 is fixed on the bulge height measuring ruler sliding connecting block 33. The bulge height measuring ruler fixed grating mounting plate 37 is fixed on the base 1. The bulge height measuring ruler fixed grating 38 is fixed on the bulge height measuring ruler fixed grating mounting plate 37.

[0053] As Figure 6 shown, the depression depth measurement unit 4 includes a depth measuring ruler U-shaped slider 41, a depth measuring ruler clamping plate 42, a depth measuring rod 43, a depth measuring ruler fixed grating 44, a depth measuring ruler moving grating 45, a depth measuring ruler moving grating adjusting plate 46, and a depth measuring ruler dial 47.

[0054] The bulge height measuring ruler 31 is provided with a limiting through groove with one end open. The depth measuring rod 43 is slidably arranged in the limiting through groove. The depth measuring ruler clamping plate 42 is fixed on the depth measuring ruler U-shaped slider 41. The depth measuring rod 43 is fixed on the depth measuring ruler clamping plate 42. The depth measuring ruler fixed grating 44 is fixed on the bulge height measuring ruler 31. The depth measuring ruler moving grating adjusting plate 46 is fixed on the depth measuring ruler U-shaped slider 41. The depth measuring ruler moving grating 45 is fixed on the depth measuring ruler moving grating adjusting plate 46. The distance between the depth measuring ruler clamping plate 42 and the depth measuring ruler U-shaped slider 41 can enable the bulge height measuring ruler 31 to move relatively between the two. A depression depth measurement unit groove 18 is provided in the middle of the base 1. The depth measuring ruler dial 47 passes through the long hole at the bottom of the housing unit 5 and the depression depth measurement unit groove 18 and is fixed on the depth measuring ruler U-shaped slider 41.

[0055] It should be noted that each of the dials in this embodiment can adopt a fastening bolt capable of adjusting the slider stop.

[0056] The specific embodiments of the present invention are further described below:

[0057] like Figure 3 As shown, since the bulge outer diameter measuring handle module 27, the bulge outer diameter measuring claw handle 26, the bulge outer diameter measuring unit sensor fixing plate 28, the bulge outer diameter measuring slider 22, and the pin shaft 214 are fixedly connected together, the bulge outer diameter measuring handle module 27 can be moved to make the bulge outer diameter measuring slider 22 move along the bulge outer diameter measuring guide rail 21, thereby driving the pin shaft 214 to move along the direction of the bulge outer diameter measuring guide rail 21. Due to the geometric relationship among the bulge outer diameter measuring fork-shaped link 29, the bulge outer diameter measuring fork-shaped link 210, the bulge outer diameter measuring jaw 1 211 and the bulge outer diameter measuring jaw 2 212, the movement of the pin 214 will cause the lowermost parts of the bulge outer diameter measuring jaw 1 211 and the bulge outer diameter measuring jaw 2 212 to open and close. When the opening and closing distance of the lowermost parts of the bulge outer diameter measuring jaw 1 211 and the bulge outer diameter measuring jaw 2 212 is exactly the size of the bulge outer diameter, the distance moved by the pin 214, that is, the distance moved by the bulge outer diameter measuring dial module 27 can also be determined by the geometric relationship between the mechanisms, so that the size of the bulge outer diameter is measured.

[0058] like Figure 9 As shown, the pin 1 214, the pin 215, the pin 3 216, and the pin 4 217 are located at positions A, B, C, and D respectively, and the distance between AB is L 1 , the distance between AC is L 1 The distance between BD is L 2 , the distance between CD is L 2 The distance from position D to the lowermost end of the bulge outer diameter measuring clamp 1 211 and the distance from position D to the lowermost end of the bulge outer diameter measuring clamp 212 are both L 30 In the initial state of the bulge height measurement, the distance between the bulge height measuring ruler 31 and the lowermost part of the bulge outer diameter measuring clamp 1 211 is L 40 The lower end of the bulge outer diameter measuring jaw 1 211 and the lower end of the bulge outer diameter measuring jaw 212 are overlapped, and the distance between AD is L 5 Therefore, according to the cosine theorem, we can get

[0059]

[0060] When measuring the height of the bulge, the lower end of the bulge outer diameter measuring jaw 1 211 and the lower end of the bulge outer diameter measuring jaw 2 212 will measure the bulge diameter, and the bulge height measuring ruler 31 will move downward by a distance L. 41 When the bulge reaches the highest point, the bulge outer diameter measuring dial module 27 will move downward by a distance L.32 such that the opening distance L between the lowermost part of the first bulging outer diameter measuring jaw 211 and the lowermost part of the second bulging outer diameter measuring jaw 212 6 This distance L 6 is also the diameter of the bulging measuring ruler. Next, the bulging outer diameter measuring pusher module 27 is moved downward by a distance L 32 and the diameter L of the bulging measuring ruler 6 The analysis process is as follows. When measuring the height of the bulge, the bulging outer diameter measuring pusher module 27 will move downward by a distance L 32 At this time, the first pin shaft 214 at position A will also move downward by a distance L 32 The distance between A and D is L 5 -L 32 According to the cosine theorem, we can obtain

[0061]

[0062] Therefore, θ can be obtained 1 = θ - θ 0 .

[0063] Furthermore, L can be obtained 31 = L 30 -L 30 cosθ 1 . Then the height of the bulge can be calculated by the following formula

[0064]

[0065] As Figure 10 shown, when measuring the depression depth, the lowermost parts of the first bulging outer diameter measuring jaw 211 and the second bulging outer diameter measuring jaw 212 need to be opened until the lowermost end of the bulge height measuring ruler 31 is placed on the top of the depression. At this time, the lowermost end of the depth measuring rod 43 touches the deepest part of the depression, and the moving distance of the depth measuring rod 43 is the depression depth L h .

[0066] Embodiment 2

[0067] As Figure 11 shown, this embodiment discloses a measurement method based on the uneven deformation measuring instrument in Embodiment 1, including the following measurement steps:

[0068] Realization of outer length measurement: First step, align the two bulging outer diameter measuring jaws. Press the "Power On Button" on the touch screen 6 to turn on the machine, and press the "Reset" button to zero; Second step, place the two bulging outer diameter measuring jaws at both ends of the object to be measured respectively, press the "Save Data" button to lock the screen value, and press the "Outer Length" button and the "Save Data" button to lock and display the outer length value separately;

[0069] Inner length measurement implementation: First step, align the outer diameter measurement jaws of the two bulges. Press the "Power On Button" on the touch screen 6 to turn on the machine, and press the "Reset" button to zero; Second step, place the outer diameter measurement jaws of the two bulges at both ends inside the object to be measured. Press the "Save Data" button to lock the screen value, or press the "Inner Length" button and the "Save Data" button to separately lock and display the inner length value;

[0070] Height measurement implementation: First step, align the bottom ends of the outer diameter measurement jaws of the two bulges and the bulge height measurement ruler 31. Press the "Power On Button" on the touch screen 6 to turn on the machine, and press the "Reset" button to zero; Second step, open the outer diameter measurement jaws of the two bulges and fix the jaws through the jaw dial 35 of the outer diameter measurement unit of the bulge, so that the outer diameter measurement jaws of the two bulges are respectively placed on both sides of the object to be measured, and place the bottom end of the bulge height measurement ruler 31 at the highest point of the object to be measured. Press the "Save Data" button to lock the screen value, or press the "Height" button and the "Save Data" button to separately lock and display the height value;

[0071] Depth measurement implementation: First step, extend the bulge height measurement ruler 31, turn the depth measurement ruler dial 47 to make the bottom end of the depth measurement rod 43 flush with the bottom end of the bulge height measurement ruler 31. Press the "Power On Button" on the touch screen 6 to turn on the machine, and press the "Reset" button to zero; Second step, open the outer diameter measurement jaws of the two bulges and fix the jaws through the jaw dial 35 of the outer diameter measurement unit of the bulge, so that the outer diameter measurement jaws of the two bulges are respectively placed on both sides of the object to be measured, and place the bottom end of the depth measurement rod 43 at the lowest point of the object to be measured. Press the "Save Data" button to lock the screen value, or press the "Depth" button and the "Save Data" button to separately lock and display the depth value;

[0072] Outer diameter measurement implementation: First step, align the bottom ends of the outer diameter measurement jaws of the two bulges and the bulge height measurement ruler 31. Press the "Power On Button" on the touch screen 6 to turn on the machine, and press the "Reset" button to zero; Second step, open the outer diameter measurement jaws of the two bulges and fix the jaws through the jaw dial 35 of the outer diameter measurement unit of the bulge, so that the outer diameter measurement jaws of the two bulges are respectively placed on both sides of the circle to be measured, and place the bottom end of the bulge height measurement ruler 31 on the circle to be measured. Press the "Save Data" button to lock the screen value, or press the "Outer Diameter" button and the "Save Data" button to separately lock and display the outer diameter value;

[0073] Inner diameter measurement implementation: First step, extend the bulge height measuring ruler 31, turn the depth measuring ruler dial 47 to make the bottom end of the depth measuring rod 43 flush with the bottom end of the bulge height measuring ruler 31, press the "Power On Button" on the touch screen 6 to power on, and press the "Reset" button to zero. Second step, open the two bulge outer diameter measuring jaws and fix the jaws through the bulge outer diameter measuring unit jaw dial 35, place the two bulge outer diameter measuring jaws on both sides of the circle to be measured respectively, and place the bottom end of the depth measuring rod 43 on the circle to be measured. Press the "Save Data" button to lock the screen value, or press the "Inner Diameter" button and the "Save Data" button to lock the displayed inner diameter value alone.

[0074] Circumference measurement implementation: The same method as for outer diameter and inner diameter measurement with the same diameter.

[0075] Inner arc length measurement implementation: The same method as for inner diameter measurement of the inner diameter.

[0076] Outer arc length measurement implementation: The same method as for outer diameter measurement of the inner diameter.

[0077] The above is only a preferred embodiment of the present invention, and does not impose any limitation on the technical scope of the present invention. Therefore, any minor modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A concave-convex deformation measuring instrument, characterized in that: The device comprises a bulge outer diameter measuring unit (2), a bulge height measuring unit (3), a depression depth measuring unit (4), a base (1), a control mainboard, a touch screen (6) and a housing unit (5), wherein the base (1) is fixed in the housing unit (5), the touch screen (6) is arranged on the surface of the housing unit (5), the bulge outer diameter measuring unit (2), the bulge height measuring unit (3), the depression depth measuring unit (4) and the control mainboard are all arranged on the base (1), and the bulge outer diameter measuring unit (2), the bulge height measuring unit (3), the depression depth measuring unit (4) and the touch screen (6) are all electrically connected to the control mainboard; The bulge outer diameter measuring unit (2) comprises a bulge outer diameter measuring guide rail (21), a bulge outer diameter measuring slider (22), a bulge outer diameter sensing and measuring mechanism, a bulge outer diameter measuring clamping claw (26), a bulge outer diameter measuring sensor fixing plate (28), a bulge outer diameter measuring fork-shaped connecting rod 1 (29), a bulge outer diameter measuring fork-shaped connecting rod 2 (210), a bulge outer diameter measuring clamping claw 1 (211), a bulge outer diameter measuring clamping claw 2 (212), and a bulge outer diameter measuring fixing plate (213). A bulge outer diameter measuring guide rail (21) is vertically arranged on one side of the surface of the base (1). The bulge outer diameter measuring guide rail (21) is arranged on the bulge outer diameter measuring guide rail fixing plate (110), the bulge outer diameter measuring slider (22) is slidably arranged in the bulge outer diameter measuring guide rail (21), the bulge outer diameter measuring sensor fixing plate (28) is arranged on the bulge outer diameter measuring slider (22), the bulge outer diameter sensing measuring mechanism is respectively arranged on the bulge outer diameter measuring sensor fixing plate (28) and the base (1), and the bulge outer diameter measuring clamping claw (26) is arranged through the long hole on the right side of the housing unit (5) The bulge outer diameter measuring sensor is arranged on the side of the bulge outer diameter measuring sensor fixing plate (28), and the end of the bulge outer diameter measuring clamping claw hand (26) is provided with a bulge outer diameter measuring clamping claw hand module (27). One end of the bulge outer diameter measuring fork-shaped connecting rod 1 (29) and the bulge outer diameter measuring fork-shaped connecting rod 2 (210) are hinged on the bulge outer diameter measuring sensor fixing plate (28) through a pin shaft 1 (214), and the other end of the bulge outer diameter measuring fork-shaped connecting rod 1 (29) is hinged to the top end of the bulge outer diameter measuring clamping claw 1 (211) through a pin shaft 2 (215). The other end of the diameter measuring fork-shaped connecting rod 2 (210) is hinged to the top end of the bulge outer diameter measuring clamp 2 (212) through a pin 3 (216); the bulge outer diameter measuring fixing plate (213) is transversely arranged at the rear end of the base (1); the middle parts of the bulge outer diameter measuring clamp 1 (211) and the bulge outer diameter measuring clamp 2 (212) are hinged to the bulge outer diameter measuring fixing plate (213) through a pin 4 (217); the clamping ends of the bulge outer diameter measuring clamp 1 (211) and the bulge outer diameter measuring clamp 2 (212) are both in the shape of an arc bent inwards.

2. The concavo-convex deformation measuring instrument according to claim 1, characterized in that: The bulge outer diameter measuring fork-shaped connecting rod 1 (29) is the same length as the bulge outer diameter measuring fork-shaped connecting rod 2 (210), and the bulge outer diameter measuring jaw 1 (211) between the pin shaft 2 (215) and the pin shaft 4 (217) is the same length as the bulge outer diameter measuring jaw 2 (212) between the pin shaft 3 (216) and the pin shaft 4 (217).

3. The concavo-convex deformation measuring instrument according to claim 1, characterized in that: The bulge outer diameter sensing and measuring mechanism comprises a bulge outer diameter measuring unit fixed grid (23), a bulge outer diameter measuring unit fixed grid fixing plate (24) and a bulge outer diameter measuring unit movable grid (25); the bulge outer diameter measuring unit fixed grid fixing plate (24) is mounted on the base (1) along the guide rail direction; the bulge outer diameter measuring unit fixed grid (23) is mounted in the bulge outer diameter measuring unit fixed grid fixing plate (24); and the bulge outer diameter measuring unit movable grid (25) is mounted on the bulge outer diameter measuring sensor fixing plate (28) corresponding to the bulge outer diameter measuring unit fixed grid (23).

4. The concavo-convex deformation measuring instrument according to claim 1, characterized in that: The shell unit (5) comprises an upper shell part (52) and a lower shell part (51), wherein the upper shell part (52) is covered on the lower shell part (51), and both sides and the bottom of the shell unit (5) are provided with long holes for adjustment, and the front end of the shell is provided with a clearance hole for the bulge outer diameter measuring unit (2), the bulge height measuring unit (3), and the depression depth measuring unit (4) to extend out.

5. The concavo-convex deformation measuring instrument according to claim 1, characterized in that: The bulge height measuring unit (3) comprises a bulge height measuring ruler (31), a bulge height measuring ruler connecting block (32), a bulge height measuring ruler sliding connecting block (33), a bulge height measuring ruler dialing hand connecting block (34), a bulge height measuring ruler dialing hand (35), a bulge height sensing and measuring mechanism, a bulge height measuring ruler guide rail (39), and a bulge height measuring ruler slider (310); a bulge height measuring unit guide rail fixing plate (17) is vertically arranged on the other side of the surface of the base (1); the bulge height measuring ruler guide rail (39) is fixed on the bulge height measuring unit guide rail fixing plate (17); and the bulge height measuring ruler slider (310) is slidably arranged on the bulge height measuring ruler. The bulge height measuring ruler is mounted on a height measuring ruler guide rail (39), the bulge height measuring ruler sliding connection block (33) is fixed on a bulge height measuring ruler slider (310), the bulge height measuring ruler connection block (32) is fixed on the bulge height measuring ruler sliding connection block (33), the bulge height measuring ruler (31) is fixed on the bulge height measuring ruler connection block (32), the bulge height measuring ruler (31) is T-shaped, the bulge height measuring ruler dialing hand connection block (34) is fixed on one side of the bulge height measuring ruler sliding connection block (33), and the bulge height measuring ruler dialing hand (35) passes through a long hole on the left side of the housing unit (5) and is fixed on the bulge height measuring ruler dialing hand connection block (34).

6. The concavo-convex deformation measuring instrument according to claim 5, characterized in that: The bulge height sensing and measuring mechanism comprises a bulge height measuring ruler moving grid (36), a bulge height measuring ruler fixed grid mounting plate (37), and a bulge height measuring ruler fixed grid (38); the bulge height measuring ruler fixed grid mounting plate (37) is mounted on the base (1) along the guide rail direction; the bulge height measuring ruler fixed grid (38) is mounted in the bulge height measuring ruler fixed grid mounting plate (37); and the bulge height measuring ruler moving grid (36) is mounted on the bulge height measuring ruler sliding connection block (33) corresponding to the bulge height measuring ruler fixed grid (38).

7. The concavo-convex deformation measuring instrument according to claim 5, characterized in that: The recess depth measuring unit (4) comprises a depth measuring ruler U-shaped slider (41), a depth measuring ruler clamp (42), a depth measuring rod (43), a depth sensing measuring mechanism and a depth measuring ruler dial (47); the bulge height measuring ruler (31) is provided with a limit slot with one end open; the depth measuring rod (43) is slidably arranged in the limit slot; the end of the depth measuring rod (43) is fixed on the depth measuring ruler clamp (42); the depth sensing measuring mechanism is arranged between the depth measuring ruler U-shaped slider (41) and the bulge height measuring ruler In the ruler (31), the depth measuring ruler U-shaped slider (41) is covered on the depth measuring ruler clamping plate (42), a slide groove is formed between the depth measuring ruler clamping plate (42) and the depth measuring ruler U-shaped slider (41), so that the bulge height measuring ruler (31) can move relatively between the two, a recessed depth measuring unit groove (18) is opened in the middle of the base (1), and the depth measuring ruler dial (47) passes through the long hole at the bottom of the housing unit (5) and the recessed depth measuring unit groove (18) and is fixed on the depth measuring ruler U-shaped slider (41).

8. The concavo-convex deformation measuring instrument according to claim 7, characterized in that: The depth sensing measuring mechanism comprises a fixed grid (44) of a depth measuring ruler, a moving grid (45) of the depth measuring ruler and an adjusting plate (46) of the moving grid of the depth measuring ruler. The fixed grid (44) of the depth measuring ruler is fixed on a bulge height measuring ruler (31), the moving grid adjusting plate (46) of the depth measuring ruler is fixed in a U-shaped slider (41) of the depth measuring ruler, and the moving grid (45) of the depth measuring ruler is fixed on the moving grid adjusting plate (46) of the depth measuring ruler.

9. A measuring method of a concavo-convex deformation measuring instrument according to any one of claims 1 to 8, characterized in that: The measurement steps include: The outer length measurement is realized as follows: the first step is to align the two bulge outer diameter measuring jaws, press the "power button" key on the touch screen (6) to turn on the machine, and press the "reset" key to reset to zero; the second step is to place the two bulge outer diameter measuring jaws at the two ends of the object to be measured, press the "save data" key to lock the screen value, and press the "outer length" key and the "save data" key to lock the displayed outer length value separately; Inner length measurement is achieved as follows: first, align the two bulge outer diameter measuring jaws, press the "power button" key on the touch screen (6) to turn on the machine, and press the "reset" key to reset to zero; second, place the two bulge outer diameter measuring jaws at the two ends of the inside of the object to be measured, press the "save data" key to lock the screen value, or press the "inner length" key and the "save data" key to lock the displayed inner length value separately; Height measurement is achieved as follows: in the first step, two bulge outer diameter measuring jaws are aligned with the bottom ends of the bulge height measuring ruler (31), the power button of the touch screen (6) is pressed to turn on the machine, and the reset button is pressed to return to zero; in the second step, the two bulge outer diameter measuring jaws are opened and the jaws are fixed by the bulge outer diameter measuring unit jaw puller (35), so that the two bulge outer diameter measuring jaws are respectively placed on both sides of the object to be measured, and the bottom end of the bulge height measuring ruler (31) is placed on the highest point of the object to be measured, and the "save data" button is pressed to lock the screen value, or the "height" button and the "save data" button are pressed to lock the displayed height value separately; Depth measurement is achieved as follows: first, extend the bulge height measuring ruler (31), turn the depth measuring ruler dial handle (47) to align the bottom end of the depth measuring rod (43) with the bottom end of the bulge height measuring ruler (31), press the "power on button" key on the touch screen (6) to turn on the device, and press the "reset" key to reset to zero; second, open the two bulge outer diameter measuring jaws and fix the jaws through the bulge outer diameter measuring unit jaw dial handle (35), so that the two bulge outer diameter measuring jaws are respectively placed on both sides of the object to be measured, and place the bottom end of the depth measuring rod (43) at the lowest point of the object to be measured, and press the "save data" key to lock the screen value, or press the "depth" key and the "save data" key to lock the displayed depth value separately; The outer diameter measurement is realized as follows: the first step is to align the two bulge outer diameter measuring jaws and the bottom end of the bulge height measuring ruler (31), press the "power on button" key on the touch screen (6) to turn on the machine, and press the "reset" key to reset to zero; the second step is to open the two bulge outer diameter measuring jaws and fix the jaws through the bulge outer diameter measuring unit jaw puller (35), so that the two bulge outer diameter measuring jaws are respectively placed on both sides of the circle to be measured, and the bottom end of the bulge height measuring ruler (31) is placed on the circle to be measured, and the "save data" key is pressed to lock the screen value, or the "outer diameter" key and the "save data" key are pressed to lock the displayed outer diameter value separately; The inner diameter measurement is realized as follows: the first step is to extend the bulge height measuring ruler (31), turn the depth measuring ruler dial (47) to make the bottom end of the depth measuring rod (43) flush with the bottom end of the bulge height measuring ruler (31), press the "power on button" key of the touch screen (6) to turn on the device, and press the "reset" key to reset to zero; the second step is to open the two bulge outer diameter measuring jaws and fix the jaws through the bulge outer diameter measuring unit jaw dial (35), so that the two bulge outer diameter measuring jaws are respectively placed on both sides of the circle to be measured, and the bottom end of the depth measuring rod (43) is placed on the circle to be measured, and the "save data" key is pressed to lock the screen value, or the "inner diameter" key and the "save data" key are pressed to lock the displayed inner diameter value separately.

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