A piston profile detection device

Abstract

The present invention provides a piston profile detection device, which mainly relates to the field of dimension detection. A piston profile detection device includes a frame, a reference turntable and an inspection turntable are set on the top surface of the frame, a reference profile model is set on the reference turntable, a three-dimensional profile groove is set on the reference profile model, a fine-tuning table is set on the inspection turntable, a clamp assembly is set on the top of the fine-tuning table, an inspection frame is set on the top of the frame, a parallel telescopic frame is set on the inspection frame, a sliding seat is slidably set on the vertical sliding frame, a rigid connecting rod is horizontally set on the sliding seat, a tracking probe is set at one end of the connecting rod close to the reference turntable, and a profile probe is set at the other end of the connecting rod. The beneficial effect of the present invention is that the present invention converts the piston profile data into a comparison with the standard curve, and intuitively displays the piston skirt profile data by detecting its error with the standard curve, so that the piston profile data can be detected in a more standardized manner.

Description

Technical Field

[0001] The present invention mainly relates to the field of dimension detection, and in particular to a piston profile detection device. Background Art

[0002] The piston is a reciprocating component in the cylinder block of an automobile engine. Its basic structure consists of a crown, head, and skirt. Due to the high-speed movement of the piston within the cylinder block and the accompanying combustion of gasoline, diesel, or natural gas, the piston reaches high temperatures during operation. The piston skirt guides the piston's reciprocating motion within the cylinder and withstands lateral pressure. During engine operation, the piston bends and deforms due to the in-cylinder gas pressure. As the piston heats up, the piston pin expands more than other areas due to the greater amount of metal. Simultaneously, the piston undergoes compression deformation under lateral pressure. The combined effect of these deformations results in the piston skirt's cross-section becoming an ellipse with its long axis perpendicular to the piston pin. Therefore, to compensate for this deformation during operation, current piston manufacturing processes typically create an elliptical outer diameter for the piston skirt. This elliptical shape makes the piston closer to a circular shape after deformation, ensuring better contact and sealing with the cylinder block, reducing piston wear, and improving energy conversion efficiency.

[0003] Since the outer circle of the piston skirt is a specially designed ellipse, it is necessary to conduct necessary inspections on the piston skirt profile during product quality inspection to ensure that the piston skirt size is qualified. Existing inspection equipment directly detects specific locations, such as patent application number CN202122978035.0, a patent document for a piston profile detection tool, which directly measures the profile at different heights of the piston skirt. The entire measurement process is relatively cumbersome and requires constant adjustment and trial and error, resulting in low inspection efficiency. At the same time, the data from each part obtained by this measurement method cannot be well integrated, making it difficult to intuitively display the inspection data. Summary of the Invention

[0004] In order to address the shortcomings of the existing technology, the present invention provides a piston profile detection device, which can convert piston profile data into a comparison with a standard curve, and intuitively display the piston skirt profile data by detecting its error with the standard curve, so that the piston profile data can be detected more standardized, reducing the difficulty of judging whether the piston profile detection is qualified or not.

[0005] To achieve the above-mentioned purpose, the present invention is implemented through the following technical solutions:

[0006] A piston profile detection device comprises a frame, a central control machine is arranged on the top of the frame, a reference turntable and an inspection turntable are arranged on the top surface of the frame, a servo drive device is arranged at the bottom of the frame, the servo drive device is used to drive the reference turntable and the inspection turntable to rotate synchronously, a reference profile model is detachably arranged on the reference turntable, a three-dimensional profile groove is arranged on the reference profile model, a fine-tuning platform is coaxially arranged on the inspection turntable, a fine-tuning servo motor for driving the fine-tuning platform to rotate is arranged on one side of the fine-tuning platform, a clamp assembly is arranged on the top of the fine-tuning platform, and the The clamp assembly is used to fix the piston workpiece, and an inspection frame is vertically arranged on one side of the top of the frame body, and a parallel telescopic frame is arranged on the inspection frame, a vertical sliding frame is slidingly arranged at the front end of the parallel telescopic frame, and a sliding seat is slidingly arranged on the vertical sliding frame, and a rigid connecting rod is horizontally arranged on the sliding seat, and a tracking probe is arranged at one end of the connecting rod close to the reference turntable, and the tracking probe is adapted to the profile groove, and a profile probe is arranged at the other end of the connecting rod, and the distance between the profile probe and the tracking probe is equal to the distance between the axis of the reference turntable and the axis of the inspection turntable.

[0007] The fixture assembly includes an electric chuck arranged on the top surface of the fine-tuning table and clamping frames arranged on both sides. A pair of electromagnetic pins are installed on the top of the clamping frames. The two electromagnetic pins are coaxially arranged and matched with the piston pin holes.

[0008] The front end of the electromagnetic pin shaft is tapered.

[0009] The servo drive device includes a servo motor and a gear transmission device. The gear transmission device is arranged between the reference turntable and the inspection turntable. The motor shaft of the servo motor is connected to the rotating shaft of the reference turntable through a coupling.

[0010] The fine-tuning servo motor is fixedly connected to one side of the inspection turntable, a conductive slip ring is installed in the rotating shaft of the inspection turntable to power the fine-tuning servo motor, fine-tuning teeth are provided on the side wall of the fine-tuning platform, the fine-tuning servo motor is driven by meshing with the fine-tuning teeth through a reduction gear box, and the fine-tuning servo motor is used to drive the fine-tuning platform to rotate relative to the inspection turntable.

[0011] The parallel telescopic frame includes a support frame fixedly connected to the inspection frame, and the front end of the support frame is provided with a pair of telescopic linear guide rails arranged in parallel. A vertical mounting seat is slidingly provided on the telescopic linear guide rails, and the vertical sliding frame is installed on the vertical mounting seat. A limit block is provided in the middle of the telescopic linear guide rail, and a buffer spring is provided between the vertical mounting seat and the limit block.

[0012] A pair of vertical linear guide rails are arranged in parallel in a vertical state in the vertical sliding frame, the sliding seat is slidably connected to the vertical linear guide rails, and an adjustment spring is arranged between the top of the vertical linear guide rail and the sliding seat.

[0013] A magnetic seat is provided at the rear side of the support frame, and a magnetic suction cup is provided at the end of the vertical mounting seat, and the magnetic seat is adapted to the magnetic suction cup.

[0014] The connecting rod has a scale at one end of the profile probe, and fixing nuts threadedly connected to the connecting rod are provided on both sides of the profile probe, and the position of the profile probe can be adjusted by the fixing nuts.

[0015] The front end of the tracking probe is a ball head.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] The present invention uses a reference profile model as a standard. A tracking probe moves along the profile grooves on the reference profile model, driving the profile probe to operate synchronously. This allows the profile probe to follow the same trajectory as the profile groove on the piston under test, detecting profile data along the piston's spiral trajectory. Since the profile of the profile groove serves as the standard line, the data detected by the profile probe represents the error from the standard line. The central control unit should display a curve that jumps up and down the reference line. By setting the upper and lower errors of the reference line, the piston profile can be intuitively determined to determine if it is acceptable.

[0018] This device converts the piston profile data into error data compared with the standard line. By comparing with the standard data, the processing error of the piston profile can be intuitively displayed, thereby making it easier to judge whether the piston profile processing is qualified, reducing the difficulty of piston skirt profile detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the first stereoscopic structural perspective of the present invention;

[0020] Figure 2 This is a schematic diagram of the second stereoscopic viewing angle structure of the present invention;

[0021] Figure 3 This is a schematic diagram of the structure of the present invention from a top view;

[0022] Figure 4 This is a schematic diagram of a partial cross-sectional structure of the present invention from a main viewing angle;

[0023] Figure 5 It is a schematic diagram of the structure of the parallel telescopic frame of the present invention;

[0024] Figure 6 This invention Figure 1 Schematic diagram of the local enlarged structure of part A.

[0025] The numbers shown in the accompanying drawings are: 1. frame; 2. central control machine; 3. reference turntable; 4. inspection turntable; 5. servo drive device; 6. reference profile model; 7. inspection frame; 8. magnetic seat; 41. fine-tuning table; 42. fine-tuning servo motor; 43. fixture assembly; 44. electric chuck; 45. clamping frame; 46. electromagnetic pin; 47. fine-tuning tooth; 61. profile groove; 71. parallel telescopic frame; 72. vertical sliding frame; 73. sliding seat; 74. connecting rod; 75. tracking probe; 76. profile probe; 81. magnetic suction cup; 711. support frame; 712. telescopic linear guide; 713. limit block; 714. vertical mounting seat; 715. buffer spring; 721. vertical linear guide; 722. adjustment spring. DETAILED DESCRIPTION

[0026] The present invention will be further described with reference to the accompanying drawings and specific embodiments. It should be understood that these embodiments are intended only to illustrate the present invention and are not intended to limit the scope of the present invention. In addition, it should be understood that after reading the contents of the present invention, those skilled in the art may make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the present application.

[0027] Example:

[0028] like Figure 1-6 As shown, the piston profile detection device of the present invention comprises a frame 1, which is constructed by welding a bracket from tubing and externally covered with a welded plate. Adjustable feet are mounted on the bottom of frame 1 for leveling. A horizontal plate is mounted on the top of frame 1, which serves as the mounting and positioning for the reference turntable 3 and the inspection turntable 4 described below.

[0029] A central control machine 2 is installed on the top of the frame 1. The central control machine 2 serves as the control center of each action component of the device and also serves as the input, output and processing unit of monitoring data.

[0030] The top surface of the frame 1 is mounted with a reference turntable 3 and a test turntable 4. Both are rotatably mounted to the horizontal plate at the top of the frame 1 via planar bearings. In this embodiment, the top surface of the horizontal plate has two mounting countersunk holes, into which the reference turntable 3 and the test turntable 4 are mounted, respectively. A driving shaft is coaxially mounted at the bottom of the reference turntable 3, and a driven shaft is coaxially mounted at the bottom of the test turntable 4. Both the driving and driven shafts are mounted to the frame 1 via bearings. A servo drive 5 is mounted at the bottom of the frame 1, which is used to drive the reference turntable 3 and the test turntable 4 to rotate synchronously. Specifically, the servo drive 5 includes a servo motor and a gear transmission. The gear transmission is mounted between the reference turntable 3 and the test turntable 4, and the gear transmission is a three-stage transmission. The motor shaft of the servo motor is connected to the driving shaft via a coupling. Driven by the servo motor, the reference turntable 3 and the test turntable 4 can rotate synchronously.

[0031] A reference profile model 6 is removably mounted on the reference turntable 3. This model is designed to simulate the outer contour of a piston skirt, a standard piston skirt profile. The reference profile model 6 includes a three-dimensional profile groove 61, the bottom contour of which corresponds to the outer contour of the reference profile model 6. The groove 61 rises in a spiral and covers the deformation area of ​​the reference profile model 6.

[0032] A fine-tuning stage 41 is coaxially mounted on the inspection turntable 4. The fine-tuning stage 41 is rotatable relative to the inspection turntable 4. By adjusting the fine-tuning stage 41, the initial position of the inspection cut-in of the piston to be inspected can be adjusted, so that the initial position of the profile probe 76 at the piston to be inspected is consistent with the initial position of the tracking probe 75 in the profile groove 61, thereby ensuring that the profile detection trajectory of the piston to be inspected is consistent with the trajectory of the profile groove 61, thereby obtaining accurate piston profile data. When inspecting the piston profile, the reference turntable 3 and the inspection turntable 4 are driven to rotate synchronously by the servo drive device 5. The tracking probe 75 traverses a spiral trajectory along the profile groove 61 on the outer wall of the reference profile model 6. The profile probe 76 follows the trajectory of the tracking probe 75 and traverses the same trajectory on the outer wall of the piston. The profile probe 76 transmits the detection data to the central control machine 2. The data obtained by the central control machine 2 is the error between the piston and the standard profile. The central control machine can draw an error curve, which should be a curve that floats up and down on the reference straight line. The maximum error lines above and below the reference straight line can clearly and intuitively reflect whether the piston's profile exceeds the standard area, thereby intuitively judging whether the piston's outer contour has been processed properly.

[0033] A fine-tuning servo motor 42 for driving the fine-tuning platform 41 to rotate is installed on one side of the fine-tuning platform 41. Specifically, the fine-tuning servo motor 42 is fixedly installed on one side of the inspection turntable 4, and a conductive slip ring is installed in the rotating shaft of the inspection turntable 4 to power the fine-tuning servo motor 42. Fine-tuning teeth 47 are machined on the side wall of the fine-tuning platform 41. The fine-tuning servo motor 42 is driven by meshing with the fine-tuning teeth 47 through a reduction gear box. The fine-tuning servo motor 42 is used to drive the fine-tuning platform 41 to rotate relative to the inspection turntable 4. The fine-tuning servo motor 42 can be used to accurately adjust the angle of the fine-tuning platform 41, thereby accurately adjusting the cutting angle during the inspection of the piston to be tested.

[0034] A fixture assembly 43 is mounted on the top of the fine-tuning platform 41, and is used to secure the piston workpiece. The fixture assembly 43 includes an electric chuck 44 for securing the piston and positioning clamping mechanisms on both sides. The top surface of the fine-tuning platform 41 is coaxial with the electric chuck 44, and is used to secure the piston. A support platform is located at the center of the electric chuck 44, which positions the piston's head end face so that the starting height of the piston profile inspection is consistent with the profile starting height of the profile groove 61. Clamping frames 45 are mounted on the horizontal surfaces on both sides of the inspection turntable 4. A pair of electromagnetic pins 46 are mounted on the top of the clamping frames 45. The two electromagnetic pins 46 are coaxially arranged and mate with the piston pin holes. When the piston needs to be secured, the piston is first placed at the center of the electric chuck 44. The central control machine 2 then controls the extension of the two electromagnetic pins 46, which are then inserted into the two pin holes of the piston. The electromagnetic pin 46 limits the piston, and then the central control machine 2 controls the electric chuck 44 to clamp the piston, and then the electromagnetic pin 46 contracts and releases the fixation on the piston. At this time, the positioning of the piston initial detection position is completed.

[0035] More specifically, the front end of the electromagnetic pin 46 is tapered, and the rear end of the electromagnetic pin 46 is the same size as the pin hole of the piston. By setting the tapered electromagnetic pin 46, the insertion of the electromagnetic pin 46 into the pin hole can be guided, ensuring that the electromagnetic pin 46 can be accurately inserted into the pin hole. This fixture assembly first limits the piston through the electromagnetic pin 46 to determine the clamping angle of the piston, thereby ensuring the entry position of the profile probe 76 for piston profile detection. Subsequently, the piston is fixed by clamping and positioning the electric chuck 44, so that the piston can be well positioned to ensure that the piston does not move during profile detection, thereby ensuring the accuracy of piston profile detection.

[0036] A test frame 7 is vertically mounted on one side of the top of the frame 1. The test frame 7 is a mounting frame for the detection device. In this embodiment, the test frame 7 and a series of structures mounted thereon are all made of rigid materials to reduce deformation during the detection process that may affect the detection results.

[0037] The inspection frame 7 is provided with a parallel telescopic frame 71 in the vertical direction, and the parallel telescopic frame 71 is perpendicular to the inspection frame 7. Specifically, the parallel telescopic frame 71 includes a support frame 711 that is detachably fixedly connected to the inspection frame 7, and the middle part of the support frame 711 is fixed to the inspection frame 7 by bolts. The front end of the support frame 711 has a pair of telescopic linear guide rails 712 installed in parallel, and a vertical mounting seat 714 is slidably installed on the telescopic linear guide rails 712, and the vertical sliding frame 72 is fixedly installed on the vertical mounting seat 714 by bolts. A limit block 713 is installed in the middle of the telescopic linear guide rail 712, and a buffer spring 715 is provided between the vertical mounting seat 714 and the limit block 713. The buffer spring 715 is in a compressed state, so that it can push the tracking probe 75 to make close contact with the profile groove 61.

[0038] More specifically, the sliding component between the vertical mounting seat 714 and the telescopic linear guide rail 712 is a sleeve, and the sleeve and the telescopic linear guide rail 712 constitute a telescopic rod, so that the telescopic linear guide rail 712 will not exceed the vertical mounting seat 714 and be exposed to the outside of the vertical mounting seat 714, thereby not interfering with the vertical sliding frame 72 installed on the vertical mounting seat 714.

[0039] A magnetic base 8 is mounted on the rear side of the support frame 711. The on / off state of the magnetic base 8 is controlled by the central control unit 2. A magnetic cup 81 is mounted on the end of the vertical mounting base 714. The magnetic base 8 cooperates with the cup 81. When the magnetic base 8 is powered, the magnetic base 8 attracts the cup 81, causing the vertical mounting base 714 to slide toward the magnetic base 8, thereby separating the tracking probe 75 from the profile groove 61.

[0040] A pair of vertical linear guide rails 721 are disposed vertically and parallel to the vertical slide frame 72, and the slide seat 73 is slidably connected to the vertical linear guide rails 721. When the tracking probe 75 moves along the profile groove 61, the slide seat 73 moves linearly in accordance with its trajectory, limited by the vertical linear guide rails 721.

[0041] Furthermore, an adjustment spring 722 is installed between the top of the vertical linear guide 721 and the sliding seat 73. The setting of the adjustment spring 722 enables the sliding seat 73 to obtain a certain support on the vertical linear guide 721, so that when the sliding seat 73 performs linear reciprocating linear motion, the friction between the tracking probe 75 and the side wall of the profile groove 61 can be reduced, so that the tracking probe 75 can run more smoothly along the profile groove 61, thereby making the detection result of the piston by the profile probe 76 more accurate. More specifically, a positioning plate is installed in the middle of the vertical linear guide 721. When the tracking probe 75 loosens the contact with the profile groove 61, the adjustment spring 722 will press the sliding seat 721, so that the sliding seat 721 moves to the limit position of the positioning plate. At this time, the profile probe 76 is just in the initial position of the piston profile detection.

[0042] A rigid connecting rod 74 is horizontally mounted on the sliding seat 73 . The connecting rod 74 is made of an alloy material with higher rigidity. When an external force is applied to the connecting rod 74 , the deformation of the connecting rod 74 becomes smaller, thereby reducing the data detection error of the piston profile.

[0043] The tracking probe 75 is installed at one end of the connecting rod 74 close to the reference turntable 3, and the front end of the tracking probe 75 is a ball head. The setting of the ball head makes the friction between the tracking probe 75 and the profile groove 61 smaller, which can reduce the vibration of the tracking probe 75, thereby reducing the error of the profile probe 76 in detecting the piston profile. The profile probe 76 is installed at the other end of the connecting rod 74, and the distance between the profile probe 76 and the tracking probe 75 is equal to the distance between the axis of the reference turntable 3 and the axis of the inspection turntable 4. More specifically, the connecting rod 74 has a scale at one end of the profile probe 76, and the fixing nuts threadedly connected to the connecting rod 74 are threadedly installed on both sides of the profile probe 76. The position of the profile probe 76 can be adjusted by the fixing nut, so that the distance between the profile probe 76 and the tracking probe 75 is equal to the distance between the axis of the reference turntable 3 and the axis of the inspection turntable 4.

[0044] In this embodiment, the servo drive device 5 , the fine-tuning servo motor 42 , the electric chuck 44 , the electromagnetic pin 46 , the profile probe 76 and the magnetic base 8 are all electrically connected to the central control machine 2 .

[0045] More specifically, using the structure of the embodiment as an example, the control process of this device is as follows, based on a chronological sequence: When the piston is placed at the center of the electric chuck 44, the central control unit 2 controls the electromagnetic pin 46 to extend and insert into the piston's pin hole to complete the piston's positioning. The central control unit 2 then controls the electric chuck 44 to clamp the piston head, while the electromagnetic pin 46 retracts to release the clamp on the piston. The central control unit 2 then controls the magnetic base 8 to release the magnetic chuck 81, causing the vertical mounting base 714 to move toward the reference profile model 6 under the elastic force of the buffer spring 715, so that the tracking probe 75 contacts the starting position of the profile groove 61 of the reference profile model 6, and the profile probe 76 correspondingly contacts the outer wall of the piston. The central control unit 2 then controls the servo drive 5 to synchronously rotate the reference turntable 3 and the inspection turntable 4. The reference profile model 6 on the reference turntable 3 rotates accordingly. The spiral profile groove 61 drives the tracking probe 75 along a spiral path on the reference profile model 6. Correspondingly, the profile probe 76 follows a spiral path on the piston skirt. At this point, the sliding seat 73 slides upward along the vertical linear guide 721, guided by the profile groove 61. Simultaneously, the vertical mounting seat 714 slides along the telescopic linear guide 712 as the tracking probe 75 moves along the irregular circular surface within the profile groove 61. When the profile probe 76 completes the profile detection of the piston, the central control machine 2 controls the servo drive device 5 to drive in reverse, so that the tracking probe 75 is reset on the reference profile model 6. Then the central control machine 2 controls the magnetic seat 8 to energize the magnetic suction cup 81 to loosen the contact of the tracking probe 75 with the reference profile model 6. Then the electric chuck 44 releases the clamping of the piston and removes the piston.

[0046] When detecting the piston profile, the profile probe 76 will pass through the pin hole position on the piston. At this time, the profile probe 76 will be separated from the outer side of the piston skirt and will not contact the piston. This part of the data does not need to be detected, and the central control machine 2 ignores this part of the data.

[0047] Specifically, after the reference profile model 6 is installed, there is a certain error difference in the installation of the reference profile model 6, and there is also a certain virtual position error in the drive of the servo drive device 5, which causes a certain offset between the profile starting point of the tracking probe 75 on the reference profile model 6 and the initial position of the piston profile detection. If it is found that the detection data error is large during the profile detection, the fine-tuning servo motor 42 can be used to drive the fine-tuning stage 41 to rotate clockwise and counterclockwise at multiple angles, and a profile detection is performed after each rotation. After multiple detections, the angle closest to the standard data is used as the reference angle to adjust the fine-tuning stage 41. At this time, the contact position of the profile probe 76 on the piston is closest to the starting position of the tracking probe 75 on the reference profile model 6.

Claims

1. A piston profile detection device, comprising a frame (1), a central control machine (2) being arranged on the top of the frame (1), characterized in that: The top surface of the frame (1) is provided with a reference turntable (3) and an inspection turntable (4); the bottom surface of the frame (1) is provided with a servo drive device (5); the servo drive device (5) is used to drive the reference turntable (3) and the inspection turntable (4) to rotate synchronously; a reference profile model (6) is detachably provided on the reference turntable (3); a three-dimensional profile groove (61) is provided on the reference profile model (6); a fine adjustment table (41) is coaxially provided on the inspection turntable (4); a fine adjustment servo motor (42) for driving the fine adjustment table (41) to rotate is provided on one side of the fine adjustment table (41); the top surface of the fine adjustment table (41) is provided with a servo drive device (5); the servo drive device (5) is used to drive the reference turntable (3) and the inspection turntable (41) to rotate synchronously; ... A fixture assembly (43) is provided at the top of the frame (1), and the fixture assembly (43) is used to fix the piston workpiece. A test frame (7) is vertically provided on one side of the top of the frame body (1), and a parallel telescopic frame (71) is provided on the test frame (7). A vertical sliding frame (72) is slidably provided at the front end of the parallel telescopic frame (71), and a sliding seat (73) is slidably provided on the vertical sliding frame (72). A rigid connecting rod (74) is horizontally provided on the sliding seat (73), and a tracking probe (75) is provided at one end of the connecting rod (74) close to the reference turntable (3), and the tracking probe (75) is adapted to the profile groove (61). A profile probe (76) is provided at the other end of the connecting rod (74), and the distance between the profile probe (76) and the tracking probe (75) is equal to the distance between the axis of the reference turntable (3) and the axis of the inspection turntable (4); the fixture assembly (43) includes an electric chuck (44) provided on the top surface of the fine-tuning table (41) and clamping frames (45) provided on both sides, a pair of electromagnetic pins (46) are installed on the top of the clamping frame (45), the two electromagnetic pins (46) are coaxially arranged, and the electromagnetic pins (46) are matched with the piston pin hole; the servo drive device (5) is a servo motor and a gear transmission device, The gear transmission device is arranged between the reference turntable (3) and the inspection turntable (4), and the motor shaft of the servo motor is connected to the rotating shaft of the reference turntable (3) through a coupling; the fine-tuning servo motor (42) is fixedly connected to one side of the inspection turntable (4), and a conductive slip ring is installed in the rotating shaft of the inspection turntable (4) to power the fine-tuning servo motor (42). Fine-tuning teeth (47) are provided on the side wall of the fine-tuning platform (41), and the fine-tuning servo motor (42) is driven by meshing with the fine-tuning teeth (47) through a reduction gear box. The fine-tuning servo motor (42) is used to drive the fine-tuning platform (41) to rotate relative to the inspection turntable (4);The parallel telescopic frame (71) includes a support frame (711) fixedly connected to the inspection frame (7), the front end of the support frame (711) has a pair of parallel telescopic linear guide rails (712), a vertical mounting seat (714) is slidably provided on the telescopic linear guide rails (712), the vertical sliding frame (72) is mounted on the vertical mounting seat (714), a limit block (713) is provided in the middle of the telescopic linear guide rails (712), a buffer spring (715) is provided between the vertical mounting seat (714) and the limit block (713), a pair of vertical linear guide rails (721) are provided in parallel in a vertical state in the vertical sliding frame (72), the sliding seat (73) is slidably connected to the vertical linear guide rails (721), and an adjustment spring (722) is provided between the top of the vertical linear guide rail (721) and the sliding seat (73).

2. A piston profile detection device according to claim 1, characterized in that: The front end of the electromagnetic pin shaft (46) is tapered.

3. The piston profile detection device according to claim 1, characterized in that: A magnetic seat (8) is provided on the rear side of the support frame (711), a magnetic suction cup (81) is provided at the end of the vertical mounting seat (714), and the magnetic seat (8) is adapted to the magnetic suction cup (81).

4. The piston profile detection device according to claim 1, characterized in that: The connecting rod (74) has a scale at one end of the profile probe (76), and fixing nuts threadedly connected to the connecting rod (74) are provided on both sides of the profile probe (76), and the position of the profile probe (76) can be adjusted by the fixing nuts.

5. A piston profile detection device according to any one of claims 1 to 4, characterized in that: The front end of the tracking probe (75) is a ball head.

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