Engine connecting rod small head oval trumpet hole detection device and method

Abstract

The application discloses an engine connecting rod small head elliptical horn hole detection device and method, which comprises a supporting plate and a detection assembly; the detection assembly comprises a small hole detection head, the bottom of the small hole detection head is installed at the upper end of a first lifting assembly; a profile gauge needle in an L shape with a profile gauge is installed in the inner cavity of the small hole detection head, one end of the profile gauge needle is installed at the upper end of the first lifting assembly, and the other end penetrates through the small hole detection head and elastically abuts against the inner wall of the elliptical horn hole of the connecting rod to be detected; four air channels are arranged in the small hole detection head, one end of the air channels extends to the bottom of the small hole detection head; one end of the two air channels opposite in the radial direction is connected with the air outlet pipe of the gas-electricity meter through a tee joint, and the other end extends to the side surface of the small hole detection head respectively. The application has the advantages that the long and short axis sizes of the elliptical hole and the accurate measurement of the horn hole profile line can be simultaneously detected through one-time clamping, and the detection precision and the detection efficiency are greatly improved.

Description

Technical Field

[0001] This invention relates to the field of engine connecting rod inspection technology, and in particular to a device and method for detecting the elliptical horn hole at the small end of an engine connecting rod. Background Technology

[0002] The connecting rod is a core transmission component of the engine. Its small bore mates with the piston pin, playing a crucial role in transmitting alternating tensile and compressive loads and guiding piston movement. The connecting rod bore employs a composite design of "elliptical + flared bore" to accommodate the piston pin's movement and deformation during engine operation, increasing the contact area and preventing abnormal wear of the connecting rod bore or piston pin damage due to excessive local stress. Simultaneously, the increased area between the connecting rod bore and piston pin effectively reduces the load-bearing specific pressure on the mating surface, preventing lubrication failure due to excessive specific pressure. Therefore, the dimensional accuracy of the elliptical bore and flared profile of the connecting rod bore directly affects the lubrication performance between the connecting rod bore and piston pin, making them key parameters of the connecting rod.

[0003] The inspection methods for elliptical and flared holes in connecting rods differ significantly from those for conventional straight holes. Furthermore, the high precision required for both elliptical and flared holes necessitates higher standards for inspection accuracy and efficiency. Existing measurement solutions for elliptical and flared holes mostly involve separate inspections, necessitating the use of multiple inspection tools. Specifically: elliptical hole inspection often uses an inside micrometer, which struggles to ensure the measurement position aligns with the major and minor axes of the ellipse, easily leading to positional deviations and significant inspection errors; flared holes are inspected using a laboratory profilometer, but this often results in low accuracy and inefficiency due to the difficulty in ensuring the measured curve corresponds to the generatrix. While coordinate measuring machines (CMMs) can also be used to inspect elliptical and flared holes, this requires laboratory testing, resulting in extremely low efficiency and failing to meet the demands of rapid on-site inspection.

[0004] Therefore, the traditional inspection of elliptical horn holes cannot simultaneously detect the contour parameters of the small end elliptical hole and horn hole of the connecting rod through a single inspection process. The process is cumbersome, inefficient, and the results are inconsistent, making it difficult to meet the dual requirements of inspection accuracy and efficiency for mass production of connecting rods. Summary of the Invention

[0005] The technical problem to be solved by this invention is to provide a method capable of simultaneously detecting the major and minor axes of an elliptical hole and the profile of a trumpet-shaped hole. Device and method for detecting the elliptical flared hole at the small end of an engine connecting rod.

[0006] To address the aforementioned technical problems, this invention provides a device for detecting the elliptical horn hole at the small end of an engine connecting rod, comprising a support plate for placing the connecting rod and a detection assembly for detecting the elliptical horn hole at the small end. The detection assembly includes a small hole detection head, the bottom of which is mounted on the upper end of a first lifting assembly. An L-shaped contour probe, similar to a contour measuring instrument, is installed inside the small hole detection head. One end of the contour probe is mounted on the upper end of the first lifting assembly, and the other end passes through the small hole detection head and elastically abuts against the inner wall of the elliptical horn hole of the connecting rod to be tested. The small hole detection head has four air passages inside, all at the same horizontal level and evenly spaced. One end of each air passage extends to the bottom of the small hole detection head. Two radially opposite air passages are connected at one end via a T-junction to the outlet pipe of a gas-electric meter, and their other ends extend to the side of the small hole detection head. The first lifting assembly, the contour measuring instrument, and the gas-electric meter are all connected to a controller.

[0007] Furthermore, two limiting blocks are installed on one side of the upper end face of the pallet, and several circumferentially distributed limiting pins are installed on the other side.

[0008] Furthermore, it also includes a display for displaying the data of the major and minor axes of the detected elliptical hole, and for displaying the generatrix contour curve of the detected flared opening; the display is electrically connected to the controller.

[0009] Furthermore, a first displacement sensor is installed on the small hole detection head or the telescopic end of the first lifting assembly, and the first displacement sensor is electrically connected to the controller.

[0010] Furthermore, a second lifting assembly is connected to the bottom of the tray; a fixing frame is installed below the tray; and a large-head positioning core that mates with the large hole of the connecting rod to be tested is installed on the fixing frame.

[0011] Furthermore, a laser rangefinder is installed at the upper end of the mounting bracket; the laser rangefinder is connected to the controller.

[0012] Furthermore, it also includes a pressure plate; a plurality of pressure heads are installed on the lower end face of the pressure plate; and a rotating pressing assembly is installed on the lower end of the pressure plate.

[0013] Furthermore, a second displacement sensor is installed on the pressure plate; a pressure sensor is installed at the bottom of each pressure head; a magnetic limit switch is installed at the upper end of the fixing frame; the second displacement sensor, the pressure sensor, and the magnetic limit switch are all electrically connected to the controller.

[0014] The present invention also provides a method for detecting the elliptical flared hole of the small end of an engine connecting rod, comprising the following steps: S1. Pre-positioning: Place the connecting rod to be tested onto the support plate, so that the connecting rod to be tested is positioned between two limiting blocks, and the large hole of the connecting rod to be tested is fitted outside several circumferentially distributed limiting pins; S2, Lowering: Press the start button, the second lifting component retracts, driving the tray and the test rod to move downwards. During the downward movement, the small end hole of the test rod is gradually inserted by the small hole detection head from bottom to top until it descends to the predetermined height, and the inner wall of the large hole of the test rod contacts the large end positioning core. S3. Clamping: After the pallet descends to the predetermined height, the rotating pressing component is activated, driving the pressure plate to rotate and press down to clamp the large end of the connecting rod to be tested. S4. Detection: S41. Detect the elliptical hole: Turn on the gas-electric meter to detect the major and minor axes of the elliptical hole and send the detection results to the controller. S42. Detecting the horn hole: Turn off the gas-electric meter, turn on the first lifting assembly and the profile measuring instrument. The first lifting assembly drives the profile probe and the small hole detection head to descend synchronously. The profile probe detects the generatrix profile of the horn hole and sends the detection result to the controller. After the detection is completed, turn off the profile measuring instrument. The travel of the profile probe can cover the entire area of ​​the horn hole. The generatrix profile of the horn hole is fitted based on the displacement changes of the profile probe in the X and Y directions. S5. Result Display: The monitor displays the detected data of the major and minor axes of the elliptical hole and the generatrix contour curve of the flared opening; the contour value of the flared opening is calculated using the minimum region method and compared with a preset threshold range, which is the contour range fitted by the theoretical coordinates of the flared opening; when the major and minor axes of the elliptical hole, the difference between the major and minor axes, or the contour value exceed the corresponding threshold range, a corresponding warning is issued; S6. Reset: The first lifting assembly, the second lifting assembly, and the rotating pressing assembly are reset. The connecting rod is removed, and the test is completed.

[0015] Furthermore, step S4 also includes detecting the thickness of the connecting rod big end: a second displacement sensor installed on the pressure plate detects the displacement of the pressure plate in real time, and the thickness of the connecting rod big end can be calculated by comparing it with the displacement value when loading the standard part; the number of pressure heads is 3.

[0016] Furthermore, when the pallet descends close to the magnetic limit switch, the magnetic limit switch sends a signal to the controller, which then controls the second lifting assembly to close and the rotating pressing assembly to open. When the pressure plate and pressure head rotate and press down, the pressure sensor sends the detected data to the controller. When a preset pressure threshold is reached, the controller controls the rotating pressing assembly to close and the gas-electric meter to open. The gas-electric meter detects the major and minor axes of the elliptical hole. After detecting the major and minor axes of the elliptical hole, the controller controls the gas-electric meter to close, the contour measuring instrument to open, and controls the first lifting assembly to retract. The first lifting assembly drives the contour measuring stylus and the small hole detection head to descend synchronously. The contour measuring stylus detects the contour of the horn hole generatrix, and the first displacement sensor detects its descent stroke and sends the data to the controller. When a preset value is reached, the controller controls the first lifting assembly and the contour measuring instrument to close.

[0017] Beneficial effects of this invention: This invention only requires one clamping and one testing process for the connecting rod to be tested, which can simultaneously measure the major and minor axes of the elliptical hole and the contour of the horn hole with precision. The process is simple, the testing position is accurate, the testing results are consistent, and the testing accuracy and efficiency are greatly improved, which can meet the dual requirements of testing accuracy and efficiency for mass production. Attached Figure Description

[0018] Figure 1 This is a cross-sectional view of Example 1 in the clamping state; Figure 2 This is a perspective view of the clamped state in Example 2; Figure 3 This is a perspective view of Example 2 after removing the pressure plate and rotating the pressing assembly; Figure 4 This is a cross-sectional view of Example 2 in the clamping state; Figure 5 for Figure 4 A magnified view of a portion of the image; Figure 6 This is a cross-sectional view of Example 3 in the clamping state.

[0019] In the figure, 1-contour probe, 2-small hole detection head, 3-air passage, 4-support plate, 5-fixed frame, 6-large head positioning core, 7-limit block, 8-limit pin, 9-first lifting assembly, 10-second lifting assembly, 11-pressure plate, 12-rotation pressing assembly, 13-laser rangefinder sensor, 14-second displacement sensor, 15-pressure head, 16-magnetic limit switch. Detailed Implementation

[0020] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings. It should be noted that these descriptions are for the purpose of aiding understanding the present invention, but do not constitute a limitation thereof. Furthermore, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0021] Example 1 A device for detecting the elliptical flared hole at the small end of an engine connecting rod, such as... Figure 1 As shown, the device includes a support plate 4 for placing the connecting rod and a detection assembly for detecting the small-head elliptical horn hole. The detection assembly includes a small hole detection head 2, the bottom of which is mounted on the upper end of the first lifting assembly 9. An L-shaped contour probe 1, which is the same as that of the contour measuring instrument, is installed in the inner cavity of the small hole detection head 2. One end of the contour probe 1 is mounted on the upper end of the first lifting assembly 9, and the other end passes through the small hole detection head 2 and elastically abuts against the inner wall of the elliptical horn hole of the connecting rod to be tested. Four air passages 3 are opened inside the small hole detection head 2. The four air passages are at the same horizontal height and are evenly distributed. One end of the air passage 3 extends to the bottom of the small hole detection head 2. One end of two radially opposite air passages 3 is connected to the air outlet pipe of the gas-electric meter through a T-junction, and the other end extends to the side of the small hole detection head 2 respectively. The first lifting assembly 9, the contour measuring instrument, and the gas-electric meter are all connected to the controller.

[0022] In this embodiment, the lower end of the contour probe 1 is located at the center of the orifice detection head 2, and four air channels 3 are evenly distributed around it. To facilitate the installation of the contour probe 1, the orifice detection head 2 can be designed as a split structure, that is, designed as two detachable parts (left and right or upper and lower) along the holes used to install the contour probe 1. The horizontal height of the four air channels 3 is located at the middle height of the elliptical horn hole, that is, the middle section of the horn hole, ensuring that this detection position corresponds to an ellipse.

[0023] Specifically, two limiting blocks 7 are installed on one side of the upper end face of the pallet 4, and several circumferentially distributed limiting pins 8 are installed on the other side.

[0024] Since the position and angle of the connecting rod loading are fixed, i.e., the position and angle of the elliptical hole are fixed, the four air passages 3 are at the same horizontal level and equally spaced, and their outlet positions are precisely designed to align with the two ends of the major axis and the two ends of the minor axis of the elliptical hole at the small end of the connecting rod, respectively. Measuring the hole diameter using a gas-electric meter is existing technology. In this embodiment, a dual-channel gas-electric meter can be used, with the two channels used to measure the major and minor axes respectively; alternatively, two independent single-channel gas-electric meters can be used, each measuring the major and minor axes respectively. Compressed air passes through the outlet pipe of the gas-electric meter and connects to two radially opposite air passages 3 inside the small hole detection head 2 via a T-junction to perform dimensional detection on the corresponding major or minor axis.

[0025] When compressed air flows out from the side opening of air passage 3, the airflow is discharged through the gap between the outer wall of the small-hole detection head 2 and the inner wall of the connecting rod small-end hole. The size of the gap has a definite functional relationship with the air path back pressure or flow rate. The pneumatic power meter measures this pneumatic parameter and converts it into an orifice diameter value. Due to the use of dual-path or two single-path pneumatic power meters, the dimensional data of the major and minor axes can be obtained simultaneously and sent to the controller.

[0026] Specifically, a large-head positioning core 6 is installed on the support plate 4 to mate with the large hole of the connecting rod to be tested.

[0027] Specifically, it also includes a pressure plate 11; a number of pressure heads 15 are installed on the lower end face of the pressure plate 11; and a rotating pressing assembly is installed on the lower end of the pressure plate 11.

[0028] Specifically, it also includes a display for showing the data of the major and minor axes of the detected elliptical hole, and for showing the generatrix contour curve of the detected flared opening; the display is electrically connected to the controller.

[0029] Example 2 Compared to Embodiment 1, a second lifting assembly 10 and a fixing frame 5 are added, and the large-head positioning core 6 is modified to be installed on the fixing frame 5, as follows. Figure 2-5 As shown.

[0030] Specifically, the bottom of the support plate 4 is connected to the second lifting component 10; a fixing frame 5 is installed below the support plate 4; and a large-head positioning core 6 that mates with the large hole of the connecting rod to be tested is installed on the fixing frame 5.

[0031] Example 3 Compared to Embodiment 2, in order to achieve automatic control of the contour measuring instrument, the pneumatic and electrical meter, the first lifting assembly 9, the second lifting assembly 10, and the rotary pressing assembly 12, a first displacement sensor, a laser rangefinder 13, a second displacement sensor 14, a pressure sensor, and a magnetic limit switch 16 are added, such as... Figure 6 As shown.

[0032] Specifically, a first displacement sensor is installed on the small hole detection head 2 or on the telescopic end of the first lifting assembly 9, and the first displacement sensor is electrically connected to the controller.

[0033] Specifically, a laser rangefinder 13 is installed on the upper end of the mounting bracket 5; the laser rangefinder 13 is connected to the controller.

[0034] Specifically, a second displacement sensor 14 is installed on the pressure plate 11; a pressure sensor is installed at the bottom of each pressure head 15; a magnetic limit switch 16 is installed at the upper end of the fixing frame 5; the second displacement sensor 14, the pressure sensor, and the magnetic limit switch 16 are all electrically connected to the controller.

[0035] In the above embodiments, the first lifting component 9 and the second lifting component 10 are both telescopic hydraulic cylinders, and the rotating pressing component 12 is a rotating pressing hydraulic cylinder.

[0036] Example 4 A method for detecting the elliptical flared hole at the small end of an engine connecting rod includes the following steps: S1. Pre-positioning: Place the connecting rod to be tested on the support plate 4, so that the connecting rod to be tested is placed between two limiting blocks 7, and the large hole of the connecting rod to be tested is fitted outside several circumferentially distributed limiting pins 8. S2, Lowering: Press the start button, the second lifting component 10 retracts, driving the support plate 4 and the test rod to move downward. During the downward movement, the small end hole of the test rod is gradually inserted by the small hole detection head 2 from bottom to top until it descends to the predetermined height, and the inner wall of the large hole of the test rod contacts the large end positioning core 6. S3. Clamping: After the support plate 4 descends to the predetermined height, the rotating pressing component 12 is activated, driving the pressure plate 11 to rotate and press down, pressing the large end of the connecting rod to be tested. S4. Detection: S41. Detect the elliptical hole: Turn on the gas-electric meter to detect the major and minor axes of the elliptical hole and send the detection results to the controller. S42. Detecting the horn hole: Turn off the gas-electric meter, turn on the first lifting component 9 and the profile measuring instrument. The first lifting component 9 drives the profile measuring stylus 1 and the small hole detection head 2 to descend synchronously. The profile measuring stylus 1 detects the generatrix profile of the horn hole and sends the detection result to the controller. After the detection is completed, turn off the profile measuring instrument. The contour measuring stylus 1 can cover the entire area of ​​the horn hole by its travel distance; the contour measuring stylus 1 has a certain degree of elasticity, and the stylus tip is in contact with the wall of the horn hole; as the first lifting component 9 moves the stylus from top to bottom, the contour measuring stylus 1 slides along the generatrix of the inner wall of the horn hole. The contour measuring instrument records the displacement changes of the contour measuring stylus 1 in the X and Y directions in real time and fits the generatrix contour of the horn hole; S5. Result Display: The monitor displays the detected data of the major and minor axes of the elliptical hole and the generatrix contour curve of the flared opening; the contour value of the flared opening is calculated using the minimum region method and compared with a preset threshold range, which is the contour range fitted by the theoretical coordinates of the flared opening; when the major and minor axes of the elliptical hole, the difference between the major and minor axes, or the contour value exceed the corresponding threshold range, a corresponding warning is issued; S6. Reset: The first lifting assembly 9, the second lifting assembly 10, and the rotating pressing assembly 12 are reset. The connecting rod is removed, and the test is completed.

[0037] Specifically, step S4 also includes detecting the thickness of the connecting rod big end: the second displacement sensor 14 installed on the pressure plate 11 detects the displacement of the pressure plate 11 in real time, and the thickness of the connecting rod big end can be calculated by comparing it with the displacement value when loading the standard part; the number of pressure heads 15 is 3.

[0038] Specifically, when the pallet 4 descends close to the magnetic limit switch 16, the magnetic limit switch 16 sends a signal to the controller, which then controls the second lifting assembly 10 to close and the rotating pressing assembly 12 to open. When the pressure plate 11 and the pressure head 15 rotate and press down, the pressure sensor sends the detected data to the controller. When the preset pressure threshold is reached, the controller controls the rotating pressing assembly 12 to close and the gas-electric meter to open. The gas-electric meter detects the major and minor axes of the elliptical hole. After detecting the major and minor axes of the elliptical hole, the controller controls the gas-electric meter to close, the contour measuring instrument to open, and controls the first lifting assembly 9 to retract. The first lifting assembly 9 drives the contour probe 1 and the small hole detection head 2 to descend synchronously. The contour probe 1 detects the contour of the horn hole generatrix, and the first displacement sensor detects its descent stroke and sends the data to the controller. When the preset value is reached (the descent stroke covers the entire area of ​​the horn hole), the controller controls the first lifting assembly 9 and the contour measuring instrument to close.

[0039] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited to the described embodiments. For those skilled in the art, various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and these variations still fall within the protection scope of the present invention.

Claims

1. A device for detecting the elliptical flared hole at the small end of an engine connecting rod, characterized in that: The device includes a support plate (4) for placing the connecting rod and a detection assembly for detecting the small-head elliptical horn hole; the detection assembly includes a small hole detection head (2), the bottom of which is installed on the upper end of the first lifting assembly (9); an L-shaped contour probe (1) is installed in the inner cavity of the small hole detection head (2), one end of which is installed on the upper end of the first lifting assembly (9), and the other end passes through the small hole detection head (2) and elastically abuts against the inner wall of the elliptical horn hole of the connecting rod to be tested; the interior of the small hole detection head (2) Four air passages (3) are provided, which are at the same horizontal level and are evenly distributed. One end of the air passage (3) extends to the bottom of the small hole detection head (2). One end of the two radially opposite air passages (3) is connected to the air outlet pipe of the gas-electric meter through a three-way connection, and the other end extends to the side of the small hole detection head (2). The first lifting assembly (9), the contour measuring instrument, and the gas-electric meter are all connected to the controller. Two limit blocks (7) are installed on one side of the upper end face of the tray (4), and several circumferentially distributed limit pins (8) are installed on the other side.

2. The engine connecting rod small end elliptical horn hole detection device according to claim 1, characterized in that: It also includes a pressure plate (11); a plurality of pressure heads (15) are installed on the lower end face of the pressure plate (11); a rotating pressing assembly (12) is installed on the lower end of the pressure plate (11).

3. The engine connecting rod small end elliptical flared hole detection device according to claim 2, characterized in that: It also includes a display for showing the data of the major and minor axes of the detected elliptical hole, and for showing the generatrix contour curve of the detected flared opening; the display is electrically connected to the controller.

4. The engine connecting rod small end elliptical flared hole detection device according to claim 2, characterized in that: A first displacement sensor is installed on the small hole detection head (2) or on the telescopic end of the first lifting assembly (9), and the first displacement sensor is electrically connected to the controller.

5. The engine connecting rod small end elliptical flared hole detection device according to claim 4, characterized in that: The bottom of the tray (4) is connected to a second lifting assembly (10); a fixing frame (5) is installed below the tray (4); a large-head positioning core (6) that mates with the large hole of the connecting rod to be tested is installed on the fixing frame (5).

6. The engine connecting rod small end elliptical flared hole detection device according to claim 5, characterized in that: A laser rangefinder (13) is installed on the upper end of the mounting bracket (5); the laser rangefinder (13) is connected to the controller.

7. The engine connecting rod small end elliptical flared hole detection device according to claim 6, characterized in that: A second displacement sensor (14) is installed on the pressure plate (11); a pressure sensor is installed at the bottom of each pressure head (15); a magnetic limit switch (16) is installed at the upper end of the fixing frame (5); the second displacement sensor (14), the pressure sensor, and the magnetic limit switch (16) are all electrically connected to the controller.

8. A detection method applicable to the elliptical flared hole detection device for the small end of the engine connecting rod as described in any one of claims 5-7, characterized in that: Includes the following steps: S1, Pre-positioning: Place the connecting rod to be tested on the tray (4) so ​​that the connecting rod to be tested is placed between two limiting blocks (7), and the large hole of the connecting rod to be tested is fitted outside several circumferentially distributed limiting pins (8); S2, Lowering: Press the start button, the second lifting component (10) retracts, driving the tray (4) and the test rod to move downward. During the downward movement, the small end hole of the test rod is gradually inserted from bottom to top by the small hole detection head (2) until it descends to the predetermined height, and the inner wall of the large hole of the test rod contacts the large end positioning core (6). S3, Clamping: After the pallet (4) descends to the predetermined height, the rotating pressing assembly (12) is activated, driving the pressure plate (11) to rotate and press down, pressing the large end of the connecting rod to be tested; S4. Detection: S41. Detect the elliptical hole: Turn on the gas-electric meter to detect the major and minor axes of the elliptical hole and send the detection results to the controller. S42. Detecting the horn hole: Turn off the gas-electric meter, turn on the first lifting component (9) and the contour measuring instrument. The first lifting component (9) drives the contour measuring stylus (1) and the small hole detection head (2) to descend synchronously. The contour measuring stylus (1) detects the busbar contour of the horn hole and sends the detection result to the controller. After the detection is completed, turn off the contour measuring instrument. S5. Result Display: The monitor displays the detected data of the major and minor axes of the elliptical hole and the generatrix contour curve of the flared opening; the contour value of the flared opening is calculated using the minimum region method and compared with a preset threshold range, which is the contour range fitted by the theoretical coordinates of the flared opening; when the major and minor axes of the elliptical hole, the difference between the major and minor axes, or the contour value exceed the corresponding threshold range, a corresponding warning is issued; S6. Reset: The first lifting assembly (9), the second lifting assembly (10), and the rotating pressing assembly (12) are reset. The connecting rod is removed, and the test is completed.

9. The detection method according to claim 8, characterized in that: Step S4 also includes detecting the thickness of the connecting rod big end: the second displacement sensor (14) installed on the pressure plate (11) detects the displacement of the pressure plate (11) in real time, and the thickness of the connecting rod big end can be calculated by comparing it with the displacement value when loading standard parts.

10. The detection method according to claim 9, characterized in that: When the pallet (4) descends to near the magnetic limit switch (16), the magnetic limit switch (16) sends a signal to the controller, which controls the second lifting assembly (10) to close and controls the rotating pressing assembly (12) to open. When the pressure plate (11) and the pressure head (15) rotate and press down, the pressure sensor sends the detected data to the controller. When the preset pressure threshold is reached, the controller controls the rotating pressing assembly (12) to close and controls the gas-electric meter to open. The gas-electric meter detects the major and minor axes of the elliptical hole. After the major and minor axes of the elliptical hole are detected, the controller controls the gas-electric meter to close, the contour measuring instrument to open, and controls the first lifting assembly (9) to retract. The first lifting assembly (9) drives the contour probe (1) and the small hole detection head (2) to descend synchronously. The contour probe (1) detects the contour of the horn hole busbar. The first displacement sensor detects its descent stroke and sends the data to the controller. When the preset value is reached, the controller controls the first lifting assembly (9) and the contour measuring instrument to close.

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