Excircle detection micrometer caliper

Abstract

The utility model discloses a outside circle detects dial gauge, specifically relates to outside circle detection tool technical field, including the dial gauge spare, the dial gauge spare is first dial gauge board, install first detection subassembly with the gauge body cooperation of first dial gauge board on first dial gauge board, is used for carrying out contact type measurement to product outside circle surface, the utility model discloses a dial gauge dial gauge, when outside circle detection, utilize the numerical value appearance of dial gauge probe to object surface change, combine the appearance structure of outside diameter dial gauge, when measuring outside diameter value, only need to let outside diameter dial gauge contact product outside diameter surface a point, and the corresponding contact point of outside diameter surface symmetry of dial gauge probe, when dial gauge shows the maximum value Dmax, can directly obtain the actual value of product outside diameter, this process not only smooth operation, need not complex adjustment step, let the operator can quickly get started, greatly shorten the preparation time before measurement, significantly improve the detection efficiency.

Description

Technical Field

[0001] This utility model relates to the technical field of external diameter inspection tools, specifically to dial gauge calipers for external diameter inspection. Background Technology

[0002] In high-precision external diameter inspection, a wide variety of methods and measuring tools are used. For measurement with a precision of level 6, commonly used tools include outside micrometers, outside dial indicators, outside calipers, and digital high-precision vernier calipers. Each of these measuring tools plays a role in the inspection work due to its different characteristics. Among them, outside calipers are widely used in mass production and other scenarios due to their outstanding inspection efficiency. They are used in pairs, such as go gauges (DT) and no-go gauges (DZ), to quickly screen the external diameter of parts.

[0003] However, existing inspection tools have certain shortcomings in practical applications. Taking the outer diameter caliper, which has the highest inspection efficiency, as an example, although the GO gauge (DT) is mainly used to control the lower deviation of dimensions and the NO-GO gauge (DZ) is mainly used to control the upper deviation of dimensions, it can quickly determine whether the outer diameter of a part is within the acceptable range. However, it cannot display the current actual value of the high-precision outer diameter, which means that the machining operator cannot directly obtain specific measured data. During the machining process, the operator can only rely on their own experience and intuition to operate the feed to achieve the required dimensions. This not only increases the difficulty of operation but also makes it difficult to accurately control the machining accuracy. It is easy to cause the part dimensions to exceed the tolerance due to misjudgment, which affects the stability of product quality. Other tools, such as the outer micrometer, can provide actual measurement values, but their inspection efficiency is relatively low and it is difficult to meet the rapid inspection needs of mass production. Therefore, an outer diameter inspection dial gauge caliper is proposed. Utility Model Content

[0004] The purpose of this invention is to provide a dial indicator caliper for external diameter inspection, in order to address the aforementioned shortcomings in the technology.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a dial indicator caliper for measuring the outer diameter of a product, including a caliper component, wherein the caliper component is a first caliper plate, and a first detection component is installed on the first caliper plate to cooperate with the gauge body of the first caliper plate for contact measurement of the outer diameter surface of the product to obtain the actual dimensional parameters of the outer diameter of the product.

[0006] Preferably, the detection component includes a first dial indicator bushing vertically mounted on a first gauge plate, one end of the first dial indicator bushing being connected to a dial indicator, and the other end of the first dial indicator bushing being connected to a first dial indicator probe.

[0007] Preferably, the first gauge plate has a first shaft hole that matches the first gauge sleeve, and the outer wall of the first gauge plate has a first screw hole on one side of the first shaft hole, and the first screw hole is internally threaded with a first clamping screw.

[0008] Through the above technical solution:

[0009] In use, first, vertically install the first dial indicator probe into the first shaft hole of the first gauge plate through the first gauge sleeve. After installation, screw the first clamping screw into the first screw hole and gently press the first gauge sleeve to ensure a stable installation. Then, use the first inside micrometer to adjust the basic outer diameter φD of the product. Subsequently, adjust the dial indicator (GB6309) to "0". This process completes the "calibration" of the measuring instrument. After the outer diameter of the product is machined, let the first gauge plate contact a point on the outer diameter surface of the product, and simultaneously let the first dial indicator probe contact another symmetrical point on the outer diameter surface of the product at that point. If the dial indicator does not change at this time, it indicates that the current dimension is equal to the basic outer diameter φD of the product. When the dial indicator value deviates negatively, it means that the outer diameter value of the product is less than the basic dimension φD. Conversely, when the dial indicator value deviates positively, the outer diameter value of the product is greater than the basic dimension. φD, the actual outer diameter value, can be directly calculated from the value displayed by the dial indicator. This outer diameter inspection dial indicator caliper utilizes the precise display of the surface change values ​​of the object by the first dial indicator probe. Combined with the reasonable shape design of the outer diameter caliper, when measuring the outer diameter value, the outer diameter caliper and the first dial indicator probe respectively contact symmetrical points on the outer diameter surface of the product. When the dial indicator displays the maximum value Dmax, this value is the actual outer diameter value of the product. This outer diameter inspection dial indicator caliper is not only convenient to use and simple to operate, and operators can master it after simple training, but also has low manufacturing cost. It can reduce the equipment investment cost of enterprises while ensuring the detection accuracy. It can also be widely adapted to the measurement work of outer diameter grinding, high-precision turning, and rolling outer diameter machining with a precision of grade 6 or above. It can also meet the high-precision outer diameter dimension inspection requirements, providing an efficient and accurate detection method for the quality control of parts processing.

[0010] Preferably, a locking assembly is provided at the connection between the first shaft hole and the first watch bushing to enhance the installation stability of the first watch bushing in the first shaft hole after it is inserted into the first shaft hole. The locking assembly includes an insertion hole opened on the surface of the first gauge plate and located at one end of the first watch bushing. A sleeve block is sleeved on the outside of the first watch bushing. The sleeve block is embedded in the inside of the insertion hole, and a plurality of first toothed blocks are connected to the outer wall of the sleeve block.

[0011] Preferably, the locking assembly further includes a slot formed on the inner wall of the first locking plate and located outside the insertion hole, an elastic side plate is connected inside the slot, and a second tooth block that meshes with the first tooth block is fixedly connected to the elastic side plate.

[0012] Preferably, a vertical rod is connected to the upper end face of the elastic side plate, an elastic connecting rod is connected to the movable groove reserved inside the vertical rod, and an insert is connected to the free end of the elastic connecting rod. A block groove is opened on the surface of the first gauge plate at the upper end of the empty groove, and an insert groove for cooperating with the insert is opened on the outer side of the block groove.

[0013] Specifically, when installing the detection component, firstly, the sleeve block, which is fitted outside the first gauge sleeve, is inserted into the insertion hole. Then, a tool is used to hook the groove on the upper end face of the insert and pull it outward. At this time, using the elastic force of the elastic connecting rod, the insert moves out of one of the grooves. Next, the insert is rotated 90 degrees and placed in the slot. Then, the insert is pushed until the second toothed block on the elastic side plate engages with the first toothed block of the sleeve block. Finally, the insert is pulled outward and rotated 90 degrees, and then released. The insert is then inserted into the other groove. This operation can enhance the stability of the first detection component after installation, avoid the loosening risk of relying solely on screw fixation, cope with connection failures caused by vibration and collision, and ensure that the detection component works reliably in complex environments.

[0014] Example 2

[0015] The difference between this embodiment and Embodiment 1 is that the second gauge plate in this embodiment has a different shape than the first gauge plate. The shape of the second gauge plate has been specifically optimized, which may allow it to better fit the surface when in contact with the outer circle of a product of a specific shape or size, reducing measurement errors caused by unstable contact. It is especially suitable for the inspection of some irregularly shaped outer circles or outer circles with special structures. Secondly, the installation position of the lever dial indicator is different from that of the dial indicator. The installation position of the lever dial indicator has been adjusted, and with the flexibility of its lever structure, it can more easily contact some symmetrical points on the outer circle of the product that are difficult to reach in conventional installation positions. This improves its adaptability in complex measurement environments and makes the measurement operation more flexible and efficient.

[0016] Specifically, the gauge component is a second gauge plate, on which a second detection component is mounted to cooperate with the gauge body of the second gauge plate. The second detection component includes a second gauge bushing that is horizontally mounted on the second gauge plate. One end of the second gauge bushing is connected to a lever micrometer, and the end of the lever micrometer away from the second gauge bushing is connected to a second micrometer probe by a screw.

[0017] Preferably, the second gauge plate has a second shaft hole that matches the second gauge bushing, and a second threaded hole on the outer wall of the second gauge plate located outside the second shaft hole, with a second clamping screw connected to the internal thread of the second threaded hole.

[0018] Through the above technical solution:

[0019] In use, first install the second dial indicator probe laterally into the second shaft hole of the second gauge plate through the second gauge bushing. After installation, screw the second clamping screw into the second screw hole and gently press the second gauge bushing to ensure a stable installation. Next, use the second inside micrometer to adjust the basic outer diameter φD of the product. Then, adjust the lever micrometer (GB8123) to "0". This process completes the "calibration" of the measuring instrument. After the outer diameter of the product is machined, let the second gauge plate contact a point on the outer diameter surface of the product, and simultaneously let the second dial indicator probe contact another symmetrical point on the outer diameter surface of the product at that point. If the lever micrometer does not change at this time, it indicates that the current dimension is equal to the basic outer diameter φD of the product. When the dial indicator value deviates negatively, it means that the outer diameter value of the product is less than the basic dimension φD. Conversely, when the dial indicator value deviates positively, the outer diameter value of the product is greater than the basic dimension φD. The actual outer diameter value φD can be directly calculated from the value displayed by the dial indicator. This outer diameter inspection dial indicator caliper utilizes the precise display of surface changes on the object by the second dial indicator probe. Combined with the reasonable design of the outer diameter caliper's shape, when measuring the outer diameter value, the outer diameter caliper and the second dial indicator probe respectively contact symmetrical points on the outer diameter surface of the product. When the lever dial indicator displays the maximum value Dmax, this value is the actual outer diameter value of the product. This outer diameter inspection dial indicator caliper is not only convenient to use and simple to operate, allowing operators to master it after simple training, but also has low manufacturing costs. It can reduce the equipment investment cost of enterprises while ensuring inspection accuracy. It can also be widely adapted to the measurement work of outer diameter grinding, high-precision turning, and rolling outer diameter machining with a precision of grade 6 or above. It can also meet the high-precision outer diameter dimension inspection requirements, providing an efficient and accurate inspection method for the quality control of parts processing.

[0020] Note: The locking assembly described above can also be used for the installation of the second detection assembly on the second gauge plate.

[0021] The technical effects and advantages provided by this utility model in the above technical solution are as follows:

[0022] 1. By setting up a dial indicator caliper, when inspecting the outer diameter, the dial indicator probe displays the numerical value of the changes on the object's surface. Combined with the shape and structure of the outer diameter caliper, when measuring the outer diameter value, simply place the outer diameter caliper in contact with a point on the product's outer diameter surface, and the dial indicator probe correspondingly contacts the symmetrical point on the outer diameter surface at that point. When the dial indicator displays the maximum value Dmax, the actual value of the product's outer diameter can be directly obtained. This process is not only smooth to operate, requiring no complex adjustment steps, allowing operators to quickly get started, but also greatly shortens the preparation time before measurement and significantly improves inspection efficiency. Especially in mass production, it can significantly reduce the impact of the inspection process on the overall production schedule. Furthermore, it overcomes the limitation of traditional outer diameter calipers that can only determine whether something is qualified or not, providing operators with more convenient and efficient measurement methods. It provides specific and accurate measured data, allowing operators to clearly understand the current dimensional status of the parts, thereby scientifically adjusting the feed rate. This eliminates the need for operation modes that rely solely on experience and intuition, effectively reducing the scrap rate caused by inaccurate dimensional control and improving the consistency and pass rate of part processing. In addition, this caliper has a low manufacturing cost, requiring no high investment in research and development and production, yet it can achieve high-precision detection results, making it extremely cost-effective. Furthermore, its application range is also very wide. Whether it is dynamic measurement in external cylindrical machining processes with a precision of 6 or above, such as external cylindrical grinding, high-precision turning, and rolling, or high-precision external cylindrical dimension inspection of finished products, it can play a stable role and provide reliable dimensional basis for different processing stages and inspection scenarios.

[0023] 2. By setting up a locking component, a dual fixing function is added to the detection component in addition to screw fixing. The two work together to greatly enhance the overall stability of the detection component after installation, avoiding the risk of loosening caused by relying solely on screw fixing. It can effectively deal with connection failure problems caused by vibration, collision and other factors during long-term use, ensuring that the detection component can maintain a reliable working state in complex working environments. It not only reduces the measurement error caused by loose installation and ensures the accuracy and consistency of the outer circle detection data, but also reduces the probability of equipment failure caused by loose components and extends the service life of the detection tool. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of the two types of calipers of this utility model;

[0025] Figure 2 This is a schematic diagram showing the maximum value Dmax of the dial indicator for the two types of calipers of this utility model.

[0026] Figure 3 This is a schematic diagram of the first gauge plate structure of this utility model;

[0027] Figure 4 This is a schematic diagram of the second gauge plate structure of this utility model;

[0028] Figure 5 This is a schematic diagram illustrating the adjustment of a dial indicator to "0" using two different caliper gauges according to this utility model.

[0029] Figure 6 This is a schematic diagram showing the dimensions of the dial indicator of this utility model;

[0030] Figure 7 This is a schematic diagram of the prior art of this utility model;

[0031] Figure 8 A schematic diagram of a locking assembly for the first dial bushing of this utility model;

[0032] Figure 9 This is an enlarged schematic diagram of the locking assembly of this utility model;

[0033] Figure 10 This is a schematic diagram of the connection between the insert and the vertical rod of this utility model.

[0034] Explanation of reference numerals in the attached figures:

[0035] 1. First caliper plate; 2. Dial indicator; 3. First indicator bushing; 4. First dial indicator probe; 5. First shaft hole; 6. First screw hole; 7. First clamping screw; 8. First inside micrometer; 9. Second caliper plate; 10. Lever dial indicator; 11. Second indicator bushing; 12. Second dial indicator probe; 13. Second shaft hole; 14. Second screw hole; 15. Second clamping screw; 16. Second inside micrometer; 17. Locking assembly; 171. Insertion hole; 172. Sleeve block; 173. First toothed block; 174. Hollow slot; 175. Elastic side plate; 176. Second toothed block; 1711. Vertical rod; 1712. Insert block; 1713. Block groove; 1714. Elastic connecting rod; 1715. Insert groove. Detailed Implementation

[0036] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings.

[0037] Example 1

[0038] This utility model provides, for example Figures 1-3 and Figures 5-7 The dial indicator caliper shown includes:

[0039] The caliper is a first caliper plate 1. A first detection component is installed on the first caliper plate 1 to cooperate with the gauge body of the first caliper plate 1. It is used to perform contact measurement on the outer circle surface of the product to obtain the actual size parameters of the outer circle of the product.

[0040] The testing assembly includes a first dial indicator bushing 3 vertically mounted on a first gauge plate 1, with a dial indicator 2 connected to one end of the first dial indicator bushing 3 and a first dial indicator probe 4 connected to the other end of the first dial indicator bushing 3.

[0041] The first gauge plate 1 has a first shaft hole 5 that is adapted to the first gauge sleeve 3. The outer wall of the first gauge plate 1 and the side of the first shaft hole 5 have a first screw hole 6. The first screw hole 6 is internally threaded with a first clamping screw 7.

[0042] Through the above technical solution:

[0043] In use, first, vertically install the first dial indicator probe 4 through the first indicator bushing 3 into the first shaft hole 5 of the first caliper plate 1. After installation, screw the first clamping screw 7 into the first screw hole 6 and gently press the first indicator bushing 3 to ensure a stable installation. Next, use the first inside micrometer 8 to adjust the basic outer diameter φD of the product, and then adjust the dial indicator 2 (GB6309) to "0". This process completes the "calibration" procedure of the measuring instrument. After the outer diameter of the product is machined, let the first caliper plate 1 contact a point on the outer diameter surface of the product, and at the same time, let the first dial indicator probe 4 contact another symmetrical point on the outer diameter surface of the product at that point. If the dial indicator 2 does not change at this time, it indicates that the current dimension is equal to the basic outer diameter φD of the product. When the dial indicator value deviates negatively, it means that the outer diameter value of the product is less than the basic diameter φD. Conversely, when the dial indicator value deviates positively, the outer diameter value of the product is greater than the basic diameter φD. The outer diameter value can be directly calculated from the value displayed by the dial indicator. This outer diameter inspection dial indicator caliper utilizes the precise display of the surface change value of the object by the first dial indicator probe 4. Combined with the reasonable shape structure design of the outer diameter caliper, when measuring the outer diameter value, the outer diameter caliper and the first dial indicator probe 4 respectively contact the symmetrical points on the outer diameter surface of the product. When the dial indicator 2 displays the maximum value Dmax, this value is the actual outer diameter value of the product. This outer diameter inspection dial indicator caliper is not only convenient to use and simple to operate, and operators can master it after simple training, but also has low manufacturing cost. It can reduce the equipment investment cost of enterprises while ensuring the detection accuracy. It can also be widely adapted to the measurement work of outer diameter machining with a precision of 6 or above, such as outer diameter grinding, high precision turning, and outer diameter rolling. It can also meet the high-precision outer diameter dimension inspection requirements and provide an efficient and accurate detection method for the quality control of parts processing.

[0044] Further, see Figures 8-10As shown, a locking assembly 17 is provided at the connection between the first shaft hole 5 and the first watch bushing 3. This assembly is used to enhance the stability of the first watch bushing 3 in the first shaft hole 5 after it is inserted into the first shaft hole 5. The locking assembly 17 includes an insertion hole 171 opened on the surface of the first gauge plate 1 and located at one end of the first watch bushing 3. A sleeve block 172 is sleeved on the outside of the first watch bushing 3. The sleeve block 172 is embedded in the inside of the insertion hole 171, and a plurality of first tooth blocks 173 are connected to the outer wall of the sleeve block 172.

[0045] The locking assembly 17 also includes a slot 174 formed on the inner wall of the first locking plate 1 and located outside the insertion hole 171. An elastic side plate 175 is connected inside the slot 174, and a second tooth block 176 that meshes with the first tooth block 173 is fixedly connected to the elastic side plate 175.

[0046] A vertical rod 1711 is connected to the upper end of the elastic side plate 175. An elastic connecting rod 1714 is connected to the movable groove reserved inside the vertical rod 1711. An insert 1712 is connected to the free end of the elastic connecting rod 1714. A block groove 1713 is opened on the surface of the first gauge plate 1 at the upper end of the empty groove 174. An insert groove 1715 is opened on the outer side of the block groove 1713 to cooperate with the insert 1712.

[0047] Specifically, when installing the detection component, firstly, insert the sleeve block 172, which is fitted outside the first instrument shaft sleeve 3, into the insertion hole 171. Then, take a tool, hook the groove on the upper end face of the insert block 1712, and pull it outward. At this time, using the elastic force of the elastic connecting rod 1714, the insert block 1712 moves out of one of the grooves 1715. Next, rotate the insert block 1712 ninety degrees, and place the insert block 1712 in the block groove 1713. Then push the insert block 1712 until the second tooth block 176 on the elastic side plate 175 engages with the first tooth block 173 of the sleeve block 172. Finally, pull it outward and rotate the insert block 1712 ninety degrees. Finally, release the insert block 1712, and the insert block 1712 is inserted into the other groove 1715. This operation can enhance the stability of the first detection component after installation, avoid the loosening risk of relying solely on screw fixation, cope with connection failures caused by vibration and collision, and ensure that the detection component works reliably in complex environments.

[0048] Example 2

[0049] like Figure 1 , Figure 2 , Figures 4-7As shown, the difference between this embodiment and Embodiment 1 is that the second gauge plate 9 in this embodiment has a different shape than the first gauge plate 1. The shape of the second gauge plate 9 has been specifically optimized, which may allow it to better fit the surface when in contact with the outer circle of a product of a specific shape or size, reducing measurement errors caused by unstable contact. It is especially suitable for the detection of some irregular outer circles or outer circles with special structures. Secondly, the installation positions of the lever micrometer 10 and the micrometer 2 are different. The installation position of the lever micrometer 10 has been adjusted. With the flexibility of its lever structure, it can more easily contact some symmetrical points on the outer circle of the product that are difficult to reach in conventional installation positions, improving adaptability in complex measurement environments and making the measurement operation more flexible and efficient.

[0050] Specifically, the gauge component is a second gauge plate 9. A second inspection component is installed on the second gauge plate 9 to cooperate with the gauge body of the second gauge plate 9. The second inspection component includes a second gauge bushing 11 that is horizontally installed on the second gauge plate 9. One end of the second gauge bushing 11 is connected to a lever micrometer 10. The end of the lever micrometer 10 away from the second gauge bushing 11 is connected to a second micrometer probe 12 by screws.

[0051] The second gauge plate 9 has a second shaft hole 13 that is adapted to the second gauge bushing 11. The outer wall of the second gauge plate 9 has a second screw hole 14 located outside the second shaft hole 13. The second screw hole 14 is internally threaded with a second clamping screw 15.

[0052] Through the above technical solution:

[0053] In use, first install the second dial indicator probe 12 laterally into the second shaft hole 13 of the second gauge plate 9 through the second gauge bushing 11. After installation, screw the second clamping screw 15 into the second screw hole 14 and gently press the second gauge bushing 11 to ensure a stable installation. Then, use the second inside micrometer 16 to adjust the basic outer diameter φD of the product. Subsequently, adjust the lever micrometer 10 (GB8123) to "0". This process completes the "calibration" procedure of the measuring instrument. After the outer diameter of the product is machined, let the second gauge plate 9 contact a point on the outer diameter surface of the product, and at the same time, let the second dial indicator probe 12 contact another symmetrical point on the outer diameter surface of the product at that point. If the lever micrometer 10 does not change at this time, it indicates that the current dimension is equal to the basic outer diameter φD of the product. When the gauge value deviates negatively, it means that the outer diameter value of the product is less than the basic dimension φD. Conversely, when the gauge value deviates positively, the outer diameter value of the product is greater than the basic dimension. The actual outer diameter value φD can be directly calculated from the value displayed by the dial indicator. This outer diameter inspection dial indicator caliper utilizes the precise display of surface changes on the object by the second dial indicator probe 12. Combined with the reasonable shape design of the outer diameter caliper, when measuring the outer diameter value, the outer diameter caliper and the second dial indicator probe 12 respectively contact symmetrical points on the outer diameter surface of the product. When the lever dial indicator 10 displays the maximum value Dmax, this value is the actual outer diameter value of the product. This outer diameter inspection dial indicator caliper is not only convenient to use and simple to operate, but also easy for operators to master after simple training. Moreover, it has low manufacturing cost, which can reduce the equipment investment cost of enterprises while ensuring the detection accuracy. It can also be widely adapted to the measurement work of outer diameter machining with a precision of 6 or above, such as outer diameter grinding, high precision turning, and outer diameter rolling. It can also meet the high-precision outer diameter dimension inspection requirements and provide an efficient and accurate detection method for the quality control of parts processing.

[0054] Note: The locking component 17 described above can also be used for the installation of the second detection component on the second caliper plate 9.

Claims

1. A dial indicator caliper for external diameter measurement, characterized in that, include: The caliper is a first caliper plate (1), and a first detection component is installed on the first caliper plate (1) to cooperate with the gauge body of the first caliper plate (1) for contact measurement of the outer circle surface of the product to obtain the actual size parameters of the outer circle of the product. The detection component includes a first dial indicator bushing (3) vertically mounted on a first gauge plate (1), one end of the first dial indicator bushing (3) is connected to a dial indicator (2), and the other end of the first dial indicator bushing (3) is connected to a first dial indicator probe (4).

2. The dial indicator caliper for external diameter inspection according to claim 1, characterized in that: The first gauge plate (1) has a first shaft hole (5) that is compatible with the first gauge bushing (3). The outer wall of the first gauge plate (1) and the side of the first shaft hole (5) have a first screw hole (6). The first screw hole (6) is internally threaded with a first clamping screw (7).

3. The dial indicator caliper for external diameter inspection according to claim 1, characterized in that: The gauge component is a second gauge plate (9). A second detection component is installed on the second gauge plate (9) to cooperate with the gauge body of the second gauge plate (9). The second detection component includes a second gauge bushing (11) that is horizontally installed on the second gauge plate (9). One end of the second gauge bushing (11) is connected to a lever micrometer (10). The end of the lever micrometer (10) away from the second gauge bushing (11) is connected to a second micrometer probe (12) by a screw.

4. The dial indicator caliper for external diameter inspection according to claim 3, characterized in that: The second gauge plate (9) has a second shaft hole (13) that is compatible with the second gauge bushing (11). The outer wall of the second gauge plate (9) and the second screw hole (14) located outside the second shaft hole (13) are connected to the second screw hole (14) by a second clamping screw (15).

5. The dial indicator caliper for external diameter inspection according to claim 2, characterized in that: A locking assembly (17) is provided at the connection between the first shaft hole (5) and the first watch bushing (3) to enhance the installation stability of the first watch bushing (3) in the first shaft hole (5) after the first watch bushing (3) passes through the first shaft hole (5). The locking assembly (17) includes an insertion hole (171) opened on the surface of the first gauge plate (1) and located at one end of the first watch bushing (3). A sleeve block (172) is sleeved on the outside of the first watch bushing (3). The sleeve block (172) is embedded in the interior of the insertion hole (171), and a plurality of first tooth blocks (173) are connected to the outer wall of the sleeve block (172).

6. The dial indicator caliper for external diameter inspection according to claim 5, characterized in that: The locking assembly (17) further includes a slot (174) formed on the inner wall of the first locking plate (1) and located outside the insertion hole (171). An elastic side plate (175) is connected inside the slot (174), and a second tooth block (176) that meshes with the first tooth block (173) is fixedly connected to the elastic side plate (175).

7. The dial indicator caliper for external diameter inspection according to claim 6, characterized in that: The upper end face of the elastic side plate (175) is connected to a vertical rod (1711). An elastic connecting rod (1714) is connected in the movable groove reserved inside the vertical rod (1711). An insert (1712) is connected to the free end of the elastic connecting rod (1714). A block groove (1713) is opened on the surface of the first gauge plate (1) and at the upper end of the empty groove (174). An insert groove (1715) for use with the insert (1712) is opened on the outside of the block groove (1713).

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