A device and method for detecting whether the distance from a through hole to a groove bottom on a cylindrical part is qualified

Abstract

This invention discloses a device and method for detecting whether the distance from a through hole to the bottom of a groove on a cylindrical part is qualified. In the device, a base extension is vertically positioned on one side of the main body. The center height of the oval through hole on the main body is the same as the upper end of the extension. The main body has a positioning groove, and its bottom surface is flush with the upper end of the extension. The side of the main body with the extension matches the outer surface of the part with the through hole and groove. A positioning pin is inserted into the oval through hole and fixed in the through hole. The extension is in the groove, and the distance between the upper and lower ends of the measuring groove at the upper end of the measuring pin and the end of the measuring pin are the upper and lower limits of the distance from the through hole to the bottom of the groove. During testing, the main body is attached to the part, and the end of the positioning pin is fixed in the through hole. The end of the measuring pin is in contact with the bottom of the groove. If the bottom surface of the positioning groove is flush with or between the upper and lower ends of the measuring groove, the distance from the through hole to the bottom of the groove is qualified; otherwise, it is unqualified. Finally, the device is disassembled, and the remaining outer surfaces with through holes and grooves are tested.

Description

Technical Field

[0001] This invention relates to the field of fairing size inspection, specifically to a device and method for detecting whether the distance from the through hole to the bottom of the groove on a cylindrical component is qualified. Background Technology

[0002] The engine intermediate casing cowling is a crucial component of an aero engine, and it includes, for example: Figure 1 The integrated annular base 1 and the double-layer sheet metal welded part at the upper end of the annular base 1 are shown. Figure 1 This is just one section of the fairing; both layers are cylindrical and concentric, with a certain gap between them. The inner cylinder 2 is lower than the outer cylinder 3, and the middle part of the inner cylinder 2 is recessed outwards along its height. Figure 2 As shown, the inner side of the inner cylinder 2 is flush with the inner side of the annular base 1, and the outer side of the outer cylinder 3 is flush with the outer side of the annular base 1. This cylindrical component rectifies and diverts the gas flowing into the intermediate casing during engine operation.

[0003] like Figure 2 As shown, the double-layered cylinder of the engine intermediate casing fairing has eight sets of slotted holes evenly arranged along its circumference. Each set of slotted holes includes a support plate slot 5 and bolt connection holes 6 symmetrically located on both sides of the support plate slot. Figure 3 As shown, the support plate groove 5 includes an integrally structured and coaxially distributed main body and a shrinking part. The main body is rectangular, with its upper end connected to the outside. The shrinking part includes two circular arcs symmetrical along the central axis of the rectangle's width. The upper end of each circular arc is smoothly connected to the lower end of the corresponding length side of the rectangle. The lower end of the shrinking part is a pointed part, and the lower end face of the pointed part is the upper end face of the annular base 1. The shrinking part has the same position and size on the inner and outer cylinders. Since the inner cylinder 2 is lower than the outer cylinder 3, the main body on the inner cylinder 2 is lower than the main body on the outer cylinder 3. The support plate groove 5 can be used to install a support plate. Bolt connection holes 6 are provided on both the inner and outer cylinders. The bolt connection holes on any side of the support plate groove on the inner cylinder 2 are flush with the bolt connection holes on the same side of the support plate groove on the outer cylinder, and the center line is distributed radially along the double-layer cylinder. The bolt connection holes on the inner cylinder 2 are close to the upper end of the inner cylinder 2.

[0004] Figure 3In the engine intermediate casing fairing, the distance L between the center of the bolt connection hole 6 and the bottom of the support plate groove 5 is a crucial dimension. An incorrect dimension will prevent the fairing from being installed into the support plate of the intermediate casing, making it a key area of ​​inspection. Currently, this dimension is measured using calipers or pins in conjunction with a depth gauge or height gauge. However, because the intermediate casing fairing is a ring-shaped part, the bolt connection hole 6 and the support plate groove 5 are not collinear in the axial direction of the part, making it impossible to directly measure this characteristic with calipers. If a pin is inserted into the bolt connection hole to be measured, and a depth gauge is used to measure the distance from the pin to the bottom of the support plate groove, the measurement will be inaccurate because the depth gauge is not collinear with the part's axis, resulting in a larger reading than the actual value. A coordinate measuring machine (CMM) can measure this dimension, but because this part is a welded sheet metal component with high flexibility, it requires tooling for inspection. This means that each part is inspected after machining, which would hinder production during mass production, resulting in a long inspection cycle and high costs. Summary of the Invention

[0005] To address the problems existing in the prior art, the present invention provides a device and method for detecting whether the distance from the through hole to the bottom of the groove on a cylindrical part is qualified. The device and method are compact, easy to operate, and have low manufacturing cost. They enable rapid and accurate detection of whether the axial distance from the through hole on the side of a cylindrical part that is not collinear in the axial direction to the bottom of the groove is qualified.

[0006] This invention is achieved through the following technical solution:

[0007] A device for detecting whether the distance from the through hole to the bottom of the groove on a cylindrical part is qualified includes a base, two positioning pins and a measuring pin;

[0008] The base includes an integral main body and an extension, both of which are elongated. The extension is vertically disposed on one side of the main body in the width direction and is located at the center of the main body in the length direction. The main body has a pair of oval through holes that connect the two sides in the width direction. The center height of the oval through holes is the same as the height of the upper end face of the extension and they are distributed on both sides of the extension. The main body has a positioning groove that connects the two sides and the upper end in the width direction of the main body at the position corresponding to the extension. The bottom surface of the positioning groove is flush with the upper end face of the extension.

[0009] The side of the main body with the extension matches a portion of the outer surface of the cylindrical part to be tested with through holes and through grooves. There are two through holes with the same diameter and symmetrically distributed on both sides of the through groove. The bottom of the through groove is far away from the center of the through hole. Two positioning pins are inserted into the corresponding oval through holes and their ends can be fixedly inserted into the corresponding through holes.

[0010] The extension can be inserted into the through slot. The end of the extension away from the main body is provided with a plug hole. The upper end of the measuring pin is provided with a measuring groove. The measuring groove is distributed around the circumference of the measuring pin. The distance between the upper end of the measuring groove and the end of the measuring pin is the upper limit of the distance from the through hole to the bottom of the through slot. The distance between the lower end of the measuring groove and the end of the measuring pin is the lower limit of the distance from the through hole to the bottom of the through slot. The measuring pin is movably inserted into the plug hole.

[0011] Preferably, the oblong through holes are of the same size and their centers are symmetrical about the extension.

[0012] Preferably, the two positioning pins are identical in shape and size. Each positioning pin includes an integral main body section and a reduced section. The main body section is cylindrical, and the reduced section is located at the end and is shaped like a frustum. The bottom surface of the frustum is smoothly connected to the main body section, and the cross-sectional diameter of the frustum is within the range of the diameter of the through hole.

[0013] Preferably, the lower end of the measuring pin is hemispherical in shape, with a radius smaller than the arc radius of the bottom of the through groove.

[0014] Furthermore, the measuring pin includes a cylindrical section, a hemispherical section, and a cap, all of which are integrally formed. The hemispherical section is located at the lower end of the cylindrical section and is hemispherical in shape. The diameter of the cylindrical section is the same as the diameter of the hemispherical section. The distance between the upper end of the measuring groove and the lower end of the hemispherical section is the upper limit of the distance from the through hole to the bottom of the groove. The distance between the lower end of the measuring groove and the lower end of the hemispherical section is the lower limit of the distance from the through hole to the bottom of the groove. A gap is left between the cylindrical section and the insertion hole.

[0015] The cap is cylindrical and located at the upper end of the cylindrical section. The diameter of the cap is larger than the diameter of the insertion hole and the cylindrical section. The measuring groove is located on the cylindrical section and is set close to the cap.

[0016] Preferably, the longitudinal section of the positioning groove is an isosceles trapezoid, and the plane corresponding to the upper base of the isosceles trapezoid is the bottom surface of the positioning groove.

[0017] Preferably, the width of the bottom surface of the positioning groove is equal to the width of the extension.

[0018] Preferably, the center of the insertion hole is located at the center of the width direction of the extension.

[0019] A method for detecting whether the distance from a through hole to the bottom of a groove in a cylindrical component is qualified, based on the apparatus for detecting whether the distance from a through hole to the bottom of a groove in a cylindrical component is qualified according to any one of the above claims, includes the following steps:

[0020] S1, attach the side of the main body with the extension to a part of the outer surface of the cylindrical part to be tested with through holes and through slots, with the extension in the through slot, insert the two positioning pins first into the corresponding oval through holes, and then fix the ends of the two positioning pins into the corresponding through holes.

[0021] S2, Insert the measuring pin into the insertion hole until the end of the measuring pin is in contact with the bottom of the through groove. If the bottom surface of the positioning groove is flush with the upper end, lower end or between the upper and lower ends of the measuring groove, the distance from the through hole to the bottom of the groove is qualified; otherwise, the distance from the through hole to the bottom of the groove is unqualified.

[0022] S3, remove the measuring pin from the insertion hole, remove the two positioning pins from the corresponding oblong through holes, and remove the extension from the through groove;

[0023] S4. On another cylindrical part of the test piece, where there is a through hole and a through groove, the test is performed according to the process of S1~S2. Then S3 is repeated.

[0024] S5, follow the repeated process described in S1~S4 to inspect the remaining outer surfaces of the cylindrical part to be tested that have through holes and through slots.

[0025] Furthermore, S2 holds the riser of the measuring pin and inserts the hemispherical section of the measuring pin into the insertion hole until the hemispherical section and the bottom of the through groove are in contact.

[0026] Compared with the prior art, the present invention has the following beneficial technical effects:

[0027] This invention discloses a device for detecting whether the distance from the through hole to the bottom of the groove on a cylindrical component is qualified. The base is designed to include an integral main body and an extension, so that one side of the main body fits against a portion of the outer surface of the cylindrical component to be tested, which has a through hole and a through groove. Two positioning pins are then inserted into the corresponding oval through holes, so that the ends of the positioning pins can be fixedly inserted into the corresponding through holes to achieve positioning of the base. The extension is elongated, allowing it to be inserted into the through slot. A connector hole is designed so that the measuring pin can fit against the bottom of the through slot. Furthermore, the upper surface of the extension is flush with the bottom surface of the positioning groove on the main body. Since the center height of the oval through hole is the same as the height of the upper surface of the extension, the distance between the centers of the two through holes and the bottom of the through slot is transferred to the distance between the bottom surface of the positioning groove and the bottom of the through slot. The bottom surface of the positioning groove serves as the observation surface. Finally, a measuring groove is designed on the upper end of the measuring pin according to the tolerance requirements of the distance between the centers of the two through holes and the bottom of the through slot. By controlling the distance between the upper and lower ends of the measuring groove and the end of the measuring pin, the relative position of the observation surface and the measuring groove can be judged to quickly determine whether the distance from the non-collinear side through holes on the cylindrical part to the bottom of the through slot is acceptable, significantly improving the accuracy and efficiency of the inspection.

[0028] This invention provides a method for detecting whether the distance from a through hole to the bottom of a groove on a cylindrical component is qualified. The method involves fitting the main body of a base with a portion of the outer surface of the cylindrical component to be tested, which has through holes and grooves. A positioning pin is inserted into the corresponding through hole to position the base. The upper end face of the extension is flush with the bottom surface of the positioning groove on the main body, and the center height of the through hole is the same as the height of the upper end face of the extension. This transfers the line connecting the centers of the through holes to be tested to the bottom surface of the positioning groove. If the bottom surface of the positioning groove (i.e., the observation surface) is flush with the upper end, lower end, or both ends of the measuring groove, the distance from the through hole to the bottom of the groove is qualified; otherwise, it is unqualified. This method solves the problem of difficulty in quickly determining whether the distance between axially non-collinear side through holes and the bottom of the groove on a cylindrical component is qualified. This invention utilizes the positional relationship between the measuring groove on the measuring pin and the observation surface to achieve rapid and accurate measurement of whether the distance between the non-collinear side through hole and the bottom of the through groove is qualified. It has been practically applied to the shroud of a certain machine's intermediate casing, solving the problems of poor accuracy and low efficiency in detecting whether the distance between the non-collinear side hole and the bottom of the through groove in the cylinder is qualified. It is simple to operate, has high detection accuracy, and significantly improves detection efficiency, and can be promoted and applied in actual production. Attached Figure Description

[0029] Figure 1 This is a structural diagram of a section of the engine intermediate casing cowling described in the background art;

[0030] Figure 2 The engine intermediate casing fairing described in the background art Figure 1 Sectional view at point AA.

[0031] Figure 3 for Figure 2 A section of the main view in the B-direction view.

[0032] Figure 4 This is a schematic diagram of the rapid measurement device described in this invention.

[0033] Figure 5 for Figure 4 The main view.

[0034] Figure 6 for Figure 4 Top view.

[0035] In the figure: 1-ring base, 2-inner cylinder, 3-outer cylinder, 4-observation surface, 5-support plate groove, 6-bolt connection hole, 71-main body, 72-extension, 73-oblong through hole, 74-positioning groove, 8-positioning pin, 9-measuring pin, 10-insertion hole, 11-measuring groove. Detailed Implementation

[0036] The present invention will be further described in detail below with reference to specific embodiments. These descriptions are for explanation purposes only and are not intended to limit the scope of the invention.

[0037] This invention discloses a device for quickly measuring whether the distance L between a through hole and the bottom of a groove on a cylindrical component is within acceptable limits. It is a positioning and measuring device. The through hole is the bolt connection hole 6 described in the background art, and the groove bottom is the support plate groove 5 described in the background art. It can be used to determine whether the distance L between the center of the bolt connection hole 6 and the bottom of the support plate groove 5 is within acceptable limits. Figure 4 As shown, it mainly includes a base, positioning pin 8, and measuring pin 9.

[0038] The base includes a main body 71 and an extension 72, both of which are elongated. The extension 72 is vertically disposed on one side of the main body 71 in the width direction and is located at the center of the length of the main body 71. The main body 71 has a pair of oval through holes 73, which connect the two sides of the main body 71 in the width direction. The center height is the same as the height of the upper end face of the extension 72. The pair of oval through holes 73 are distributed on both sides of the extension 72, have the same size, and are symmetrical about the center of the extension 72. The main body 71 has a positioning groove 74 at the position corresponding to the extension 72. The positioning groove 74 connects the two sides and the upper end of the main body 71 in the width direction. The bottom surface of the positioning groove 74 is the observation surface 4, which can be used as a reference surface and is flush with the upper end face of the extension 72. In this way, the center lines of the two oval through holes 73 are flush with the observation surface 4, thereby transferring the distance between the center of the two bolt connection holes 6 and the bottom of the support plate groove 5 to the distance between the observation surface 4 and the bottom of the support plate groove 5.

[0039] Furthermore, such as Figure 6 As shown, the side of the main body 71 with the extension 72 matches a part of the outer surface of the cylindrical part to be measured with a slotted structure (fitting during measurement). That is, the inner side of the base is an arc surface, and there are two bolt connection holes 6 with the same diameter and symmetrically distributed on both sides of the support plate slot 5. The bottom of the slot is far away from the center of the bolt connection hole 6. Two positioning pins 8 are inserted into the corresponding oval through holes 73, and their ends can be fixedly inserted into the corresponding through holes to facilitate the positioning of the base.

[0040] From the above structural description, it can be concluded that the extension 72 can be inserted into the support plate groove 5, which facilitates the subsequent installation of the measuring pin 9. Specifically, the end of the extension 72 away from the main body 71 has a insertion hole 10, and the center of the insertion hole 10 is located at the center of the width direction of the extension 72. Figure 5As shown, a measuring groove 11 is provided at the upper end of the measuring pin 9, which is the end of the measuring pin 9. The measuring groove 11 is specifically distributed around the circumference of the measuring pin 9. According to the tolerance requirement of the distance L from the bolt connection hole 6 to the bottom of the support plate groove 5, the distance between the upper end of the measuring groove 11 and the end of the measuring pin 9 is the upper limit dimension of the distance from the bolt connection hole 6 to the bottom of the support plate groove 5, and the distance between the lower end of the measuring groove 11 and the end of the measuring pin 9 is the lower limit dimension of the distance from the bolt connection hole 6 to the bottom of the support plate groove 5. The measuring pin 9 is movably inserted into the insertion hole 10, so that it fits against the bottom of the support plate groove 5.

[0041] Specifically, this invention designs the two locating pins 8 as a single integrated structure consisting of a main body segment and a reduction segment, both coaxially arranged. The main body segment is cylindrical, while the reduction segment, located at the end, is shaped like a frustum. This allows the bottom surface of the frustum to smoothly connect with the main body segment, enabling the locating pin 8 to self-center. Generally, the two locating pins 8 are also identical in size; that is, the corresponding dimensions of the main body segment and reduction segment in one locating pin are the same as those in the other. The shape of the frustum ensures that its cross-sectional diameter falls within the tolerance range of the bolt connection hole 6, allowing the locating pin 8 to fit tightly with the measured bolt connection hole 6, ensuring accurate positioning. The lower end of the measuring pin 9 is hemispherical, and its radius is smaller than the radius of the arc at the bottom of the support plate groove 5. The measuring pin 9 is specifically a one-piece structure consisting of a cylindrical section, a hemispherical section, and a riser. The hemispherical section is located at the lower end of the cylindrical section and is hemispherical in shape. The diameter of the cylindrical section is the same as that of the hemispherical section. Thus, the distance between the upper end of the measuring groove 11 and the lower end of the hemispherical section is the upper limit of the distance from the bolt connection hole 6 to the bottom of the support plate groove 5, and the distance between the lower end of the measuring groove 11 and the lower end of the hemispherical section is the lower limit of the distance from the bolt connection hole 6 to the bottom of the support plate groove 5. Therefore, a gap is required between the cylindrical section and the aforementioned insertion hole 10 to facilitate the up-and-down movement of the measuring pin 9. The riser is specifically cylindrical and located at the upper end of the cylindrical section. Its diameter is larger than that of the insertion hole 10 and the cylindrical section. This allows the measuring pin 9 to be secured in the insertion hole 10 through the riser, and also facilitates the operation of the measuring pin 9. Thus, the measuring groove 11 is specifically located on the cylindrical section and close to the riser.

[0042] The longitudinal section of the positioning groove 74 is specifically an isosceles trapezoid, and the plane corresponding to its upper base is the bottom surface of the positioning groove 74. The width of the bottom surface of the positioning groove 74 is equal to the width of the extension 72.

[0043] During measurement, the measuring pin 9 is passed through the insertion hole 10 in the base, so that the lower end of the hemispherical section of the measuring pin 9 is in contact with the bottom of the support plate groove 5. The distance range from the observation surface 4 to the bottom of the support plate groove 5 is directly observed through the measuring pin 9. When the observation surface 4 is flush with the upper end, lower end or between the upper and lower ends of the measuring groove 11, it can be determined that the distance from the bolt connection hole 6 to the bottom of the support plate groove 5 is qualified.

[0044] This invention provides a method for quickly measuring whether the distance from the through hole to the bottom of the groove on a cylindrical component is qualified, comprising the following steps:

[0045] Step (1): The side of the main body 71 with the extension 72 is attached to a part of the outer surface of the cylindrical part to be tested, which has bolt connection holes 6 and support plate grooves 5. The extension 72 is in the support plate groove 5. The two positioning pins 8 are first inserted into the corresponding oval through holes 73, and then the ends of the two positioning pins 8 are fixedly inserted into the corresponding bolt connection holes 6.

[0046] Step (2): Hold the cap of measuring pin 9 and insert the hemispherical section of measuring pin 9 into the insertion hole 10. Gradually push it in until the hemispherical section and the bottom of the support plate groove 5 are tightly fitted. Visually inspect it. The line of sight should be level with the observation surface 4. If the bottom surface of the observation surface 4 is level with the upper end, lower end or between the upper and lower ends of the measuring groove 11, then the distance from the bolt connection hole 6 to the bottom of the support plate groove 5 is qualified. Otherwise, the distance from the bolt connection hole 6 to the bottom of the support plate groove 5 is unqualified.

[0047] Step (3): Remove the measuring pin 9 from the insertion hole 10, remove the two positioning pins 8 from the corresponding oblong through hole 73, and remove the extension 72 from the through groove;

[0048] Step (4): On the outer surface of the cylindrical part to be tested, where there is a bolt connection hole 6 and a support plate groove 5, the process of steps (1) to (2) is followed, and then step (3) is repeated.

[0049] Step (5): Repeat the process described in steps (1) to (4) to inspect the remaining outer surfaces of the cylindrical part to be tested that have through holes and through slots.

Claims

1. A device for detecting whether the distance from a through hole to the bottom of a groove on a cylindrical component is qualified, characterized in that, Includes a base, two positioning pins (8) and a measuring pin (9); The base includes an integral main body (71) and an extension (72). Both the main body (71) and the extension (72) are elongated. The extension (72) is vertically arranged on one side of the width direction of the main body (71). The extension (72) is distributed at the center of the length of the main body (71). The main body (71) is provided with a pair of oval through holes (73) that connect the two sides of its width direction. The center height of the oval through holes (73) is the same as the height of the upper end face of the extension (72) and they are distributed on both sides of the extension (72). The main body (71) is provided with a positioning groove (74) that connects the two sides and the upper end of the width direction of the main body (71) at the position corresponding to the extension (72). The bottom surface of the positioning groove (74) is flush with the upper end face of the extension (72). The side of the main body (71) with the extension (72) matches a portion of the outer surface of the cylindrical part to be tested with through holes and through grooves. There are two through holes with the same diameter and symmetrically distributed on both sides of the through groove. The bottom of the through groove is far away from the center of the through hole. Two positioning pins (8) are inserted into the corresponding oval through holes (73) and their ends can be fixedly inserted into the corresponding through holes. The extension (72) can be inserted into the through slot. The end of the extension (72) away from the main body (71) is provided with a plug hole (10). The upper end of the measuring pin (9) is provided with a measuring groove (11). The measuring groove (11) is distributed around the measuring pin (9). The distance between the upper end of the measuring groove (11) and the end of the measuring pin (9) is the upper limit of the distance from the through hole to the bottom of the through slot. The distance between the lower end of the measuring groove (11) and the end of the measuring pin (9) is the lower limit of the distance from the through hole to the bottom of the through slot. The measuring pin (9) is movably inserted into the plug hole (10). The two positioning pins (8) are identical in shape and size. Each positioning pin (8) includes an integral main body section and a reduction section. The main body section is cylindrical, and the reduction section is located at the end and is shaped like a frustum. The bottom surface of the frustum is smoothly connected to the main body section. The cross-sectional diameter of the frustum is within the range of the diameter of the through hole. The lower end of the measuring pin (9) is hemispherical in shape, with a radius smaller than the radius of the arc at the bottom of the through groove; The measuring pin (9) includes a cylindrical section, a hemispherical section and a cap, which are integrally structured. The hemispherical section is located at the lower end of the cylindrical section and is hemispherical in shape. The diameter of the cylindrical section is the same as the diameter of the hemispherical section. The distance between the upper end of the measuring groove (11) and the lower end of the hemispherical section is the upper limit of the distance from the through hole to the bottom of the groove. The distance between the lower end of the measuring groove (11) and the lower end of the hemispherical section is the lower limit of the distance from the through hole to the bottom of the groove. There is a gap between the cylindrical section and the insertion hole (10). The cap is cylindrical and located at the upper end of the cylindrical section. The diameter of the cap is larger than the diameter of the insertion hole (10) and the cylindrical section. The measuring groove (11) is located on the cylindrical section and is set close to the cap.

2. The device for detecting whether the distance from the through hole to the bottom of the groove on a cylindrical component is qualified according to claim 1, characterized in that, The oblong through holes (73) are of the same size and their centers are symmetrical about the extension (72).

3. The device for detecting whether the distance from the through hole to the bottom of the groove on a cylindrical component is qualified according to claim 1, characterized in that, The longitudinal section of the positioning groove (74) is an isosceles trapezoid, and the plane corresponding to the upper base of the isosceles trapezoid is the bottom surface of the positioning groove (74).

4. The device for detecting whether the distance from the through hole to the bottom of the groove on a cylindrical component is qualified according to claim 1, characterized in that, The width of the bottom surface of the positioning groove (74) is equal to the width of the extension (72).

5. The device for detecting whether the distance from the through hole to the bottom of the groove on a cylindrical component is qualified according to claim 1, characterized in that, The center of the insertion hole (10) is located at the center of the width direction of the extension (72).

6. A method for detecting whether the distance from the through hole to the bottom of the groove on a cylindrical component is qualified, characterized in that, The apparatus for detecting whether the distance from the through hole to the bottom of the groove on a cylindrical component is qualified according to any one of claims 1 to 5 includes the following steps: S1, attach the side of the main body (71) with the extension (72) to a part of the outer surface of the cylindrical part to be tested with through holes and through grooves. The extension (72) is in the through groove. Insert the two positioning pins (8) into the corresponding oval through holes (73) first, and then fix the ends of the two positioning pins (8) into the corresponding through holes. S2, insert the measuring pin (9) into the insertion hole (10) until the end of the measuring pin (9) fits against the bottom of the through groove. If the bottom surface of the positioning groove (74) is flush with the upper end, lower end or between the upper and lower ends of the measuring groove (11), the distance from the through hole to the bottom of the groove is qualified; otherwise, the distance from the through hole to the bottom of the groove is unqualified. S3, remove the measuring pin (9) from the insertion hole (10), remove the two positioning pins (8) from the corresponding oblong through hole (73), and remove the extension (72) from the through groove; S4. On another cylindrical part of the test piece, where there is a through hole and a through groove, the test is performed according to the process of S1~S2. Then S3 is repeated. S5, follow the repeated process described in S1~S4 to inspect the remaining outer surfaces of the cylindrical part to be tested that have through holes and through slots.

7. The method for detecting whether the distance from the through hole to the bottom of the groove on a cylindrical component is qualified according to claim 6, characterized in that, S2 holds the cap of the measuring pin (9) and inserts the hemispherical section of the measuring pin (9) into the insertion hole (10) until the hemispherical section and the bottom of the through groove are in contact.

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