Device for measuring inner diameter and outer diameter of large-diameter part

Abstract

The utility model discloses a device for measuring the inner and outer diameters of a large-diameter part, relates to the technical field of measurement, and aims to solve the problems of low measurement precision and low measurement efficiency of the inner and outer diameters of the large-diameter part, and the device comprises a measuring rod main body, a supporting and positioning structure and an adjustable measuring structure, the positioning part is detachably arranged outside the measuring rod main body in a sleeving manner and is movably arranged along the extension direction of the measuring rod main body, so that the measuring rod main body is always parallel to the end surface of a to-be-measured part, the positioning part can be fixed with the measuring rod main body, and the adjustable measuring structure is detachably arranged on the measuring rod main body in a sleeving manner and is movably arranged along the extension direction of the measuring rod main body. The adjustable measuring structure comprises a measuring top and an inner diameter measuring meter which are movably arranged on the measuring rod body, the zero position of the inner diameter measuring meter is adjusted through a calibration plate consistent with the size of the part to be measured, a measuring meter rod and the measuring top of the inner diameter measuring meter are both in contact with the part to be measured, and the measuring meter rod is arranged on the inner diameter measuring meter in a telescopic mode.

Description

Technical Field

[0001] The utility model relates to the technical field of measurement, and more specifically to a device for measuring the inner and outer diameters of large-diameter parts. Background Art

[0002] Generally, calipers, outside micrometers, inside micrometers, etc. can be used to measure cylindrical parts. For example, the maximum measuring size of the outside micrometer is 600mm, and the maximum measuring size of the inside micrometer is 120mm. If the size exceeds this, a larger range of inside and outside micrometers must be used. However, such large-range measuring tools are expensive, easy to damage, and have high maintenance costs, which increases costs.

[0003] At present, the measurement method for large-diameter cylindrical parts is the trial-fitting method, that is, first machine an inner hole that matches the outer diameter of the part, that is, a standard hole, and put the part into the standard hole. If it cannot be put in, the part needs to be reprocessed, and this process is repeated until the part is put into the standard hole. The outer diameter of the part is estimated based on the fitting clearance between the part and the standard hole. The same is true for measuring the inner diameter of the part. This method is highly dependent on the workers' experience, has low measurement accuracy, and is also inefficient.

[0004] Therefore, how to solve the problem of low measurement accuracy and low measurement efficiency of the inner and outer diameters of large-diameter parts is an urgent problem to be solved by technical personnel in this field. Utility Model Content

[0005] In view of this, the purpose of the utility model is to provide a device for measuring the inner and outer diameters of large-diameter parts, which has a simple structure, low cost, easy operation, high measurement efficiency and high precision.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] A device for measuring inner and outer diameters of large-diameter parts, comprising:

[0008] Measuring rod body;

[0009] The support positioning structure comprises a positioning part, which is detachably sleeved on the outside of the measuring rod body and movably arranged along the extension direction of the measuring rod body, so that the measuring rod body is always parallel to the end face of the part to be measured, and the positioning part can be fixed to the measuring rod body;

[0010] The adjustable measuring structure is detachably mounted on the measuring rod body. The adjustable measuring structure includes a measuring head and an inner diameter gauge movably mounted on the measuring rod body. The inner diameter gauge is zeroed by a calibration plate having the same size as the part to be measured. The measuring rod and the measuring head of the inner diameter gauge are in contact with the part to be measured. The measuring rod is retractably mounted on the inner diameter gauge.

[0011] Preferably, the calibration plate is a step structure, the calibration plate includes a first step surface and a second step surface, the length of the first step surface is equal to the standard value of the inner diameter of the part to be measured, and the length of the second step surface is equal to the standard value of the outer diameter of the part to be measured.

[0012] Preferably, the adjustable measuring structure also includes a fixing ring for fixing the inner diameter gauge and the measuring head, the bottom of the fixing ring is provided with a through hole and a first threaded hole connected to the through hole, the screw and the first threaded hole are cooperated to fix the measuring gauge rod and the measuring head to the corresponding fixing ring, and the measuring gauge rod and the measuring head are both arranged along the extension direction of the measuring rod body.

[0013] Preferably, the fixing ring is further provided with a mounting hole for mounting the measuring rod body and a second threaded hole connected to the mounting hole, and the fixing ring is locked to the measuring rod body by cooperation of a locking bolt and the second threaded hole.

[0014] Preferably, the supporting positioning structure includes at least two horizontal fixing frames, and at least two horizontal fixing frames are provided with a mounting hole for mounting the measuring rod body and a second threaded hole connected to the mounting hole. The horizontal fixing frame is locked to the measuring rod body by means of a locking bolt and the second threaded hole. The bottom of the horizontal fixing frame is a positioning portion, and the positioning portion is a horizontal end surface.

[0015] Preferably, the measuring rod body is provided with a key slot cooperating with the locking bolt, and the key slot is arranged along the extension direction of the measuring rod body.

[0016] Preferably, the measuring rod body is a cylindrical structure, a rectangular structure or a semi-cylindrical structure.

[0017] The utility model provides a device for measuring the inner and outer diameters of large-diameter parts, comprising a measuring rod main body, a supporting positioning structure and an adjustable measuring structure. Specifically, the supporting positioning structure has a positioning portion, and the positioning portion of the supporting positioning structure and the adjustable measuring structure are both detachably mounted on the measuring rod main body. The relative positions of the supporting positioning structure and the adjustable measuring structure on the measuring rod main body are adjusted by disassembly, so that the adjustable measuring structure can measure the outer diameter and inner diameter of the part to be measured. When the outer diameter of the part to be measured needs to be measured, the adjustable measuring structure is installed on the outer side of the supporting positioning structure, and when the inner diameter of the part to be measured needs to be measured, the adjustable measuring structure is installed on the inner side of the supporting positioning structure.

[0018] The positioning part of the support positioning structure can be movably arranged along the extension direction of the measuring rod body so that the measuring rod body is always parallel to the end face of the part to be measured, and the positioning part can be fixed to the measuring rod body. The position of the support positioning structure on the measuring rod body is manually adjusted. After adjusting until the positioning part of the support positioning structure is in complete contact with the upper end face of the part to be measured, the measuring rod body and the positioning part are fixed so that the measuring rod body installed on the support positioning structure is always parallel to the end face of the part to be measured, thereby ensuring the accuracy of measuring the part to be measured.

[0019] The adjustable measuring structure includes a measuring head and an inner diameter gauge movably arranged on the measuring rod body. The inner diameter gauge is adjusted to zero position through a calibration plate that is consistent with the size of the part to be measured. First, the positioning portion of the supporting positioning structure is adjusted to be completely in contact with the upper end surface of the calibration plate, and the supporting positioning structure is fixed to the measuring rod body. Then, the positions of the measuring head and the inner diameter gauge on the measuring rod body are manually adjusted until the measuring rod and the measuring head of the inner diameter gauge are in contact with the position to be measured (i.e., the outer end surface or the inner end surface) of the calibration plate. The measuring head and the inner diameter gauge are set as an adjustable structure along the measuring rod body to be suitable for measuring the outer diameter and inner diameter of parts to be measured of different sizes. When the measuring rod and the measuring head are in contact with the calibration plate, the measuring head is first fixed on the measuring rod body. The measuring rod is retractably arranged on the inner diameter gauge, and then the measuring rod is continued to be adjusted to move to a position close to the calibration plate so that the measuring rod is subjected to pressure. After the measuring rod is subjected to pressure, the pointer of the inner diameter gauge will rotate, and the size of the pointer rotation range is the size of the pressure on the measuring rod. When the measuring rod is subjected to a certain pressure, the position of the measuring rod on the measuring rod body is fixed, and then the pointer is manually adjusted to point to the zero scale line position of the inner diameter gauge. Finally, the entire measuring device is removed, and the measuring device is placed as a whole on the part to be measured, so that the positioning part of the supporting positioning structure is completely in contact with the upper end surface of the part to be measured, and then the measuring rod body is swung back and forth within a small range, and the range of rotation of the pointer of the inner diameter gauge is observed to obtain the actual size of the part to be measured.

[0020] The device for measuring the inner and outer diameters of large-diameter parts set up in the above manner uses an inner diameter gauge to measure the size of the part to be measured. The scale of the inner diameter gauge is 0.01mm, so the measurement accuracy of the part to be measured can be improved. The device has a simple structure, is easy to operate, saves measurement time, and improves measurement efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0022] Figure 1 This is a schematic diagram of the structure of the device for measuring the inner and outer diameters of large-diameter parts provided by the utility model;

[0023] Figure 2 A top view of the device for measuring inner and outer diameters of large-diameter parts provided by the utility model;

[0024] Figure 3 A schematic diagram of the structure of the calibration plate provided by the utility model;

[0025] Figure 4 This is a schematic diagram of the structure of the large-diameter part inner and outer diameter measuring device provided by the utility model during calibration;

[0026] Figure 5 A schematic diagram of the structure of the device for measuring inner and outer diameters of large-diameter parts provided by the utility model for measuring inner diameters;

[0027] Figure 6 The utility model is a schematic diagram of the structure of the device for measuring the inner and outer diameters of large-diameter parts provided by the utility model for measuring the outer diameter.

[0028] Reference numerals:

[0029] 01-Parts to be tested;

[0030] 1- measuring rod body, 11- keyway;

[0031] 2-support positioning structure, 21-positioning part, 22-horizontal fixing frame;

[0032] 3-adjustable measuring structure, 31-measuring head, 32-inner diameter gauge, 33-measuring gauge rod, 34-fixing ring;

[0033] 4-calibration plate, 41-first step surface, 42-second step surface;

[0034] 5- screws;

[0035] 6-Tighten the bolt. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0037] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] It should be noted that the directional words such as "inside" and "outside" below are defined based on the drawings in the specification.

[0039] The core of the utility model is to provide a device for measuring the inner and outer diameters of large-diameter parts, which has the advantages of simple structure, low cost, easy operation, high measuring efficiency and high precision.

[0040] Please refer to Figure 1 , Figure 2 , Figure 3 and Figure 4 A device for measuring the inner and outer diameters of large-diameter parts includes a measuring rod body 1, a supporting and positioning structure 2 and an adjustable measuring structure 3.

[0041] Specifically, the supporting positioning structure 2 has a positioning portion 21, and the positioning portion 21 of the supporting positioning structure 2 and the adjustable measuring structure 3 can be detachably mounted on the measuring rod body 1. The relative positions of the supporting positioning structure 2 and the adjustable measuring structure 3 on the measuring rod body 1 are adjusted by disassembly, so that the adjustable measuring structure 3 can measure the outer diameter and inner diameter of the part 01 to be measured. When the outer diameter of the part 01 to be measured needs to be measured, the adjustable measuring structure 3 is installed on the outer side of the supporting positioning structure 2. When the inner diameter of the part 01 to be measured needs to be measured, the adjustable measuring structure 3 is installed on the inner side of the supporting positioning structure 2.

[0042] The positioning portion 21 of the support positioning structure 2 can be movably arranged along the extension direction of the measuring rod body 1 so that the measuring rod body 1 is always parallel to the end face of the part to be measured 01, and the positioning portion 21 can be fixed to the measuring rod body 1. The position of the support positioning structure 2 on the measuring rod body 1 is manually adjusted. After the positioning portion 21 of the support positioning structure 2 is adjusted to completely contact the upper end face of the part to be measured 01, the measuring rod body 1 and the positioning portion 21 are fixed so that the measuring rod body 1 installed on the support positioning structure 2 is always parallel to the end face of the part to be measured 01, thereby ensuring the accuracy of measuring the part to be measured.

[0043] The adjustable measuring structure 3 includes a measuring pin 31 and an inner diameter gauge 32 movably arranged on the measuring rod body 1. The inner diameter gauge 32 is adjusted to zero position through a calibration plate 4 that is consistent with the size of the part 01 to be measured. First, the positioning portion 21 of the supporting positioning structure 2 is adjusted to be completely in contact with the upper end surface of the calibration plate 4, and the supporting positioning structure 2 is fixed on the measuring rod body 1. Then, the positions of the measuring pin 31 and the inner diameter gauge 32 on the measuring rod body 1 are manually adjusted until the measuring rod 33 of the inner diameter gauge 32 and the measuring pin 31 are both in contact with the position to be measured (i.e., the outer end surface or the inner end surface) of the calibration plate 4. The measuring pin 31 and the inner diameter gauge 32 are set as an adjustable structure along the measuring rod body 1 to be suitable for measuring the outer diameter and inner diameter of the part 01 to be measured of different sizes. When the measuring rod 33 and the measuring pin 31 are both in contact with the calibration plate 4, the measuring pin 31 is first fixed in the measuring position. The measuring rod 33 is retractably arranged on the inner diameter gauge 32, and then the measuring rod 33 is continuously adjusted to move to a position close to the calibration plate 4, so that the measuring rod 33 is subjected to pressure. After the measuring rod 33 is subjected to pressure, the pointer of the inner diameter gauge 32 will rotate, and the size of the pointer rotation range is the size of the pressure on the measuring rod 33. When the measuring rod 33 is subjected to a certain pressure, the position of the measuring rod 33 on the measuring rod body 1 is fixed, and then the pointer is manually adjusted to point to the zero scale line position of the inner diameter gauge 32. Finally, the entire measuring device is removed, and the measuring device is placed as a whole on the part to be measured 01, so that the positioning portion 21 of the supporting positioning structure 2 is completely in contact with the upper end surface of the part to be measured 01, and then the measuring rod body 1 is swung back and forth within a small range, and the range of rotation of the pointer of the inner diameter gauge 32 is observed to obtain the actual size of the part to be measured 01.

[0044] The inner diameter gauge 32 is used to quickly and accurately measure the outer diameter and inner diameter of large diameter parts (it can also be the shape and inner groove of rectangular parts) through the calibration plate 4. The pointer of the inner diameter gauge 32 is adjusted to zero using the calibration plate 4. The two supporting positioning structures 2 are adjusted so that the positioning portion 21 of the supporting positioning structure 2 contacts the end face of the part 01 to be measured, ensuring that it is perpendicular to the measuring direction and the measured value is stable. The directions of the measuring head 31 and the measuring gauge rod 33 are adjusted to measure both the outer diameter and the inner diameter of the part 01 to be measured.

[0045] The device for measuring the inner and outer diameters of large-diameter parts set up in the above manner uses an inner diameter gauge 32 to measure the size of the part 01 to be measured. The scale of the inner diameter gauge 32 is 0.01mm, so the measurement accuracy of the part 01 to be measured can be improved. The device has a simple structure, is easy to operate, saves measurement time, and improves measurement efficiency.

[0046] Please refer to Figure 3The calibration plate 4 is a step structure, and the calibration plate 4 includes a first step surface 41 and a second step surface 42. The length of the first step surface 41 is equal to the standard value of the inner diameter of the part 01 to be measured, and the length of the second step surface 42 is equal to the standard value of the outer diameter of the part 01 to be measured.

[0047] It should be noted that each time the calibration plate 4 is made according to the standard value of the part to be measured 01 actually measured, the length of the narrow step surface is equal to the size of the inner hole of the part to be measured 01, and the length of the wide step surface is equal to the size of the outer diameter of the part to be measured 01, wherein the standard value of the inner diameter of the part to be measured 01 is the standard value of the inner hole diameter of the part to be measured 01 actually made, and the standard value of the outer diameter of the part to be measured 01 is the standard value of the outer circumferential diameter of the part to be measured 01 actually made. The part to be measured 01 and the calibration plate 4 are processed according to the standard values, but the size of the manufactured part to be measured 01 will have deviations. Therefore, the zero position calibration of the device is completed by the calibration plate 4, and then the part to be measured 01 is accurately measured. When the measured size of the part to be measured 01 does not meet the requirements, the part to be measured 01 is processed again until the requirements are met.

[0048] Before measuring the inner diameter size of the part 01 to be measured, install the supporting positioning structure 2 on the outside of the adjustable measuring structure 3, first adjust the positioning portion 21 of the supporting positioning structure 2 to be completely in contact with the upper end surface of the calibration plate 4, and fix the supporting positioning structure 2 on the measuring rod body 1, and then manually adjust the positions of the measuring head 31 and the inner diameter gauge 32 on the measuring rod body 1 until the measuring rod 33 and the measuring head 31 of the inner diameter gauge 32 are in contact with the first step surface 41 of the calibration plate 4, fix the measuring head 31 on the measuring rod body 1, adjust the inner diameter gauge 32 to generate a certain pressure, fix the inner diameter gauge 32 on the measuring rod body 1, adjust the inner diameter gauge 32 so that the pointer of the inner diameter gauge 32 is aligned with the 0 scale line, and complete the calibration of the measuring device.

[0049] Please refer to Figure 4 Before measuring the outer diameter of the part 01 to be measured, install the supporting positioning structure 2 on the inner side of the adjustable measuring structure 3, first adjust the positioning portion 21 of the supporting positioning structure 2 to be completely in contact with the upper end surface of the calibration plate 4, and fix the supporting positioning structure 2 on the measuring rod body 1, and then manually adjust the positions of the measuring head 31 and the inner diameter gauge 32 on the measuring rod body 1 until the measuring gauge rod 33 and the measuring head 31 of the inner diameter gauge 32 are in contact with the second step surface 42 of the calibration plate 4, fix the measuring head 31 on the measuring rod body 1, adjust the inner diameter gauge 32 to generate a certain pressure, fix the inner diameter gauge 32 on the measuring rod body 1, adjust the inner diameter gauge 32 so that the pointer of the inner diameter gauge 32 is aligned with the 0 scale line, and complete the calibration of the measuring device.

[0050] The operation of the measuring device during calibration on the calibration plate 4 is substantially the same as the measurement operation on the part 01 to be measured.

[0051] In the above case, the adjustable measuring structure 3 also includes a fixing ring 34 for fixing the inner diameter gauge 32 and the measuring head 31. The bottom of the fixing ring 34 is provided with a through hole and a first threaded hole connected to the through hole. The screw 5 and the first threaded hole are used to fix the measuring gauge rod 33 and the measuring head 31 to the corresponding fixing ring 34. The measuring gauge rod 33 and the measuring head 31 are both arranged along the extension direction of the measuring rod body 1.

[0052] It can be understood that when in use, the inner diameter gauge 32 and the measuring head 31 are respectively installed in the through holes of the corresponding fixing ring 34, and the measuring gauge rod 33 and the measuring head 31 are tightened to the corresponding fixing ring 34 through the first threaded hole connected to the through hole and the screw 5. The measuring gauge rod 33 and the measuring head 31 are both arranged parallel to the measuring rod body 1.

[0053] Furthermore, the fixing ring 34 is also provided with a mounting hole for mounting the measuring rod body 1 and a second threaded hole connected to the mounting hole, and the fixing ring 34 is locked to the measuring rod body 1 by the locking bolt 6 and the second threaded hole.

[0054] It should be noted that the measuring rod body 1 is installed in the installation hole of the fixing ring 34 , and the locking bolt 6 is passed through the second threaded hole and tightened to tighten the fixing ring 34 to the measuring rod body 1 .

[0055] In the above embodiment, the supporting positioning structure 2 includes at least two horizontal fixing frames 22, and at least two horizontal fixing frames 22 are provided with a mounting hole for mounting the measuring rod body 1 and a second threaded hole connected to the mounting hole. The locking bolt 6 and the second threaded hole cooperate to lock the horizontal fixing frame 22 to the measuring rod body 1. The bottom of the horizontal fixing frame 22 is the positioning portion 21, and the positioning portion 21 is a horizontal end surface.

[0056] It can be understood that the measuring rod body 1 is installed in the mounting hole of the horizontal fixing frame 22, and the locking bolt 6 is passed through the second threaded hole and tightened to tighten the horizontal fixing frame 22 to the measuring rod body 1. During actual use, the horizontal end surface of the bottom of the horizontal fixing frame 22 directly abuts against the end surface of the calibration plate 4 or the part to be measured 01 to ensure the horizontality of the measuring rod body 1 and the calibration plate 4 or the part to be measured 01.

[0057] Please refer to Figure 2 The measuring rod body 1 is provided with a key groove 11 which cooperates with the locking bolt 6 , and the key groove 11 is arranged along the extending direction of the measuring rod body 1 .

[0058] It should be noted that a keyway 11 is provided on the measuring rod body 1 , which is clearance-matched with the locking bolt 6 . The locking bolt 6 can slide in the keyway 11 and play a guiding role.

[0059] In the above embodiments, the measuring rod body 1 is a cylindrical structure, a rectangular structure or a semi-cylindrical structure.

[0060] It should be noted that the measuring rod body 1 is preferably a cylindrical structure for ease of use, but in actual applications, there is no limitation on the shape of the measuring rod body 1 as long as the above-mentioned technical effects can be achieved.

[0061] In summary, the device for measuring the inner and outer diameters of large-diameter parts provided by the utility model, before measuring the part 01 to be measured, first adjust the horizontal fixing frame 22 so that the positioning surface at the end of the horizontal fixing frame 22 contacts the end surface of the calibration plate 4 to ensure that the horizontal fixing frame 22 is perpendicular to the measuring direction, and then adjust the fixing ring 34 of the inner diameter gauge 32 and the fixing ring 34 of the measuring head 31 so that the measuring head 31 and the measuring gauge rod 33 are respectively in contact with the calibration plate 4. At this time, tighten the locking bolt 6 of the measuring head 31, and then adjust the measuring gauge rod 33 to move to a position close to the calibration plate 4 so that the measuring gauge rod 33 is subjected to pressure. After the measuring gauge rod 33 is subjected to pressure, the pointer of the inner diameter gauge 32 will rotate, and the size of the pointer rotation range is the size of the pressure on the measuring gauge rod 33. When the measuring gauge rod 33 is subjected to a certain pressure, tighten the locking bolt 6 of the inner diameter gauge 32, and manually adjust the pointer so that the pointer points to the zero scale line position of the inner diameter gauge 32. Finally, remove the entire measuring device and place the measuring device as a whole on the part 01 to be measured.

[0062] When measuring the outer diameter of the part 01 to be measured, the horizontal fixing frame 22 needs to be installed inside the adjustable measuring structure 3, and the whole is firstly calibrated to zero position through the second step surface 42 of the calibration plate 4. Figure 4 The state shown is then removed as a whole and placed on the part to be tested 01 as shown in Figure 6 In the state shown, the measuring rod body 1 is rotated along the circumferential direction of the part 01 to be measured, and the degree of the inner diameter gauge 32 will change. The reading when the pressure is maximum is taken and compared with the zero line during calibration to know the diameter of the part 01 to be measured. When measuring the inner diameter of the part 01 to be measured, it is only necessary to rotate the measuring head 31 and the measuring gauge rod 33 by 180 degrees respectively and then install and fix them. At this time, it is also necessary to remove the horizontal fixing frame 22 and reinstall it as shown in FIG. Figure 5 In the state shown, the whole is calibrated to zero position through the first step surface 41 of the calibration plate 4, and then the whole is taken down and placed on the part to be measured 01, and the inner diameter of the hole of the part to be measured 01 can also be measured.

[0063] The device has a simple structure, low cost and is easy to operate; it is flexible to use, highly efficient, and has stable and high-precision measured values; it can be used during and after the processing of the part 01 to be measured; the inner diameter gauge 32 is a common and commonly used measuring instrument with low cost of use.

[0064] It should be noted that, in this specification, relational terms such as first and second are merely used to distinguish one entity from other entities, but do not necessarily require or imply any actual relationship or order between these entities.

[0065] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0066] The above is a detailed introduction to a device for measuring the inner and outer diameters of large-diameter parts provided by the utility model. This article uses specific examples to illustrate the principles and implementation methods of the utility model. The description of the above embodiments is only used to help understand the method and core idea of ​​the utility model. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the utility model, the utility model can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the claims of the utility model.

Claims

1. A device for measuring inner and outer diameters of large-diameter parts, characterized in that: include: Measuring rod body (1); A support positioning structure (2) having a positioning portion (21), wherein the positioning portion (21) is detachably sleeved on the outside of the measuring rod body (1) and is movably arranged along the extension direction of the measuring rod body (1) so that the measuring rod body (1) is always parallel to the end surface of the part to be measured (01), and the positioning portion (21) can be fixed to the measuring rod body (1); An adjustable measuring structure (3) is detachably mounted on the measuring rod body (1), the adjustable measuring structure (3) comprising a measuring head (31) and an inner diameter gauge (32) movably mounted on the measuring rod body (1), the inner diameter gauge (32) being adjusted to zero position by a calibration plate (4) having the same size as the part to be measured (01), a measuring rod (33) of the inner diameter gauge (32) and the measuring head (31) both being in contact with the part to be measured (01), and the measuring rod (33) being retractably mounted on the inner diameter gauge (32).

2. The device for measuring inner and outer diameters of large-diameter parts according to claim 1, characterized in that: The calibration plate (4) is a step structure, comprising a first step surface (41) and a second step surface (42), the length of the first step surface (41) being equal to the standard value of the inner diameter of the part to be measured (01), and the length of the second step surface (42) being equal to the standard value of the outer diameter of the part to be measured (01).

3. The device for measuring inner and outer diameters of large-diameter parts according to claim 1, characterized in that: The adjustable measuring structure (3) further comprises a fixing ring (34) for fixing the inner diameter gauge (32) and the measuring head (31); a through hole and a first threaded hole communicating with the through hole are provided at the bottom of the fixing ring (34); the measuring gauge rod (33) and the measuring head (31) are fixed to the corresponding fixing ring (34) by means of a screw (5) and the first threaded hole; the measuring gauge rod (33) and the measuring head (31) are both arranged along the extension direction of the measuring rod body (1).

4. The device for measuring inner and outer diameters of large-diameter parts according to claim 3, characterized in that: The fixing ring (34) is also provided with a mounting hole for mounting the measuring rod body (1) and a second threaded hole communicating with the mounting hole, and the fixing ring (34) is locked to the measuring rod body (1) by means of a locking bolt (6) and the second threaded hole.

5. The device for measuring inner and outer diameters of large-diameter parts according to claim 4, characterized in that: The support and positioning structure (2) comprises at least two horizontal fixing frames (22), and at least two of the horizontal fixing frames (22) are provided with the mounting hole for mounting the measuring rod body (1) and the second threaded hole connected to the mounting hole, and the locking bolt (6) and the second threaded hole cooperate to lock the horizontal fixing frame (22) to the measuring rod body (1), and the bottom of the horizontal fixing frame (22) is the positioning portion (21), and the positioning portion (21) is a horizontal end surface.

6. The device for measuring inner and outer diameters of large-diameter parts according to claim 5, characterized in that: The measuring rod body (1) is provided with a key groove (11) that cooperates with the locking bolt (6), and the key groove (11) is arranged along the extension direction of the measuring rod body (1).

7. The device for measuring inner and outer diameters of large-diameter parts according to any one of claims 1 to 6, characterized in that: The measuring rod body (1) is a cylindrical structure, a rectangular structure or a semi-cylindrical structure.

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