Engine accessory nondestructive testing device and method based on intelligent sensor

Abstract

The invention belongs to the technical field of intelligent sensor detection, and discloses an engine accessory nondestructive testing device and method based on an intelligent sensor.The device comprises a rack, and a driving roller rotating assembly and a driven roller rotating assembly are installed at the front position and the rear position of the top end of the rack correspondingly; an opposite clamping assembly is arranged between the driving rolling assembly and the driven rolling assembly, annular grooves are formed in the peripheral face of a roller body of the driving rolling assembly and the peripheral face of a roller body of the driven rolling assembly, a cross plate shaft is connected between the two annular grooves in a clamped mode, and the two ends of the cross plate shaft are each sleeved with a piston to be detected. The opposite clamping assembly is used for exerting acting force on the outer top face of the piston in the axial direction, pneumatic pressing disc assemblies are installed at the positions, on the two sides of the cross disc shaft, of the top end of the machine frame, a rectangular through groove is formed in the position, below the cross disc shaft, of the machine frame, and two terahertz thickness measuring probes are arranged below the rectangular through groove. The top of the rack is provided with two adjustable supports which are used for supporting and installing the terahertz thickness measuring probe and driving the terahertz thickness measuring probe to move axially. According to the invention, the piston can be subjected to nondestructive testing.

Description

Technical Field

[0001] This invention belongs to the field of intelligent sensor detection technology, specifically, it relates to a non-destructive testing device and method for engine parts based on intelligent sensors. Background Technology

[0002] In an engine, the piston is responsible for compressing and igniting the mixture of fuel and air to generate power and propel the car. To improve the wear resistance and service life of the piston, its outer surface is usually coated with a wear-resistant coating, such as chromium, ceramic composite coating, and diamond-like carbon coating. These coatings can effectively reduce friction and wear, ensuring the stable operation of the engine under high temperature and high pressure. The thickness and uniformity of the coating are crucial. Too thin a coating may lead to premature wear, while too thick a coating may affect the assembly clearance or even cause it to fall off. Therefore, precise testing must be carried out during production or maintenance. A portable terahertz thickness gauge is a non-destructive testing tool. Its working principle is to emit extremely short terahertz electromagnetic pulses to the coating surface. These pulses are reflected on the coating surface and at the interface between the coating and the metal substrate. By accurately capturing the tiny time difference between these two reflected signals and combining it with the known propagation speed of terahertz waves in a specific coating material, the instrument can directly calculate the actual thickness of the coating.

[0003] In practice, the operator first needs to clean the piston surface and calibrate the instrument. Then, the probe is non-contactly aligned with the measurement area. After triggering the measurement, the thickness value can be directly read on the screen of the terahertz thickness gauge. The uniformity and integrity of the coating are comprehensively evaluated by performing multi-point measurements in the key areas of the piston. During this operation, the piston is usually placed on the workpiece stage using a fixture, and the operator holds the probe of the terahertz thickness gauge around the workpiece to perform multi-point detection. The terahertz thickness gauge is based on the principle of pulse reflection, and its measurement accuracy depends on the probe being perpendicular to the surface being measured. This requires the operator to keep the probe as perpendicular to the normal of the measured point as possible in multiple measurement points and maintain a constant small hovering distance. Relying on the operator's visual inspection and experience to manually position the preset measurement grid points results in low repeatability of the action position, which can easily lead to a decrease in the comparability of measurement data between different batches of piston workpieces or even between different operators, and the measurement data fluctuates greatly. Summary of the Invention

[0004] The purpose of this invention is to provide a non-destructive testing device and method for engine parts based on intelligent sensors. Two piston workpieces to be measured are mounted on a cross disc shaft with the piston tops facing outwards. The cross disc shaft with two pistons is embedded into the annular grooves of the roller bodies of the active roller assembly and the driven roller assembly. The pneumatic pressure plate assemblies on the left and right sides apply pressure to the cross disc shaft, while the opposing clamping assembly applies axial clamping force to the pistons. After the active roller assembly drives the cross disc shaft and pistons to rotate slowly, the operator adjusts the axial position of the terahertz thickness probe through an adjustable bracket to complete the non-destructive testing of the piston coating, thereby solving the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: A non-destructive testing device for engine parts based on intelligent sensors includes a frame. An active roller assembly and a driven roller assembly are respectively mounted at the front and rear positions of the top of the frame. A counter-clamping assembly is provided between the active and driven roller assemblies. Annular grooves are formed on the outer circumferential surfaces of the rollers of both the active and driven roller assemblies. A cross-shaped disc shaft is engaged between two annular grooves. Test pistons are fitted at both ends of the cross-shaped disc shaft, with the skirts of the two test pistons facing each other. The counter-clamping assembly applies axial force to the outer top surface of the pistons. Pneumatic pressure plate assemblies are mounted on the top of the frame on both sides of the cross-shaped disc shaft. The disc assembly is used to apply load to the cross disc shaft to ensure that the cross disc shaft is pressed between the active roller assembly and the driven roller assembly. A rectangular through slot is opened on the frame below the cross disc shaft. Two terahertz thickness probes are installed below the rectangular through slot. Two adjustable brackets are installed on the top of the frame to support the installation of the terahertz thickness probes and drive the terahertz thickness probes to move axially. An air pump station is installed on one side of the bottom of the frame to supply pneumatic power to the opposing clamping assembly and the pneumatic pressure plate assembly. A control panel is installed on one side of the frame surface. The control output terminal of the control panel is electrically connected to the control input terminal of the active roller assembly and the air pump station.

[0006] The following are further optimizations of the above technical solution by the present invention: The active roller assembly includes a roller frame fixedly installed at the front of the top of the frame. A servo motor is installed on one side of the outer wall of the roller frame. An I-shaped hollow cylinder is fixedly installed on the power output shaft of the servo motor. A rubber-coated roller is provided on the other side of the outer wall of the roller frame, and the end of the rubber-coated roller is bolted to the end of the I-shaped hollow cylinder. An annular groove is formed on the outer circumferential surface of the rubber-coated roller.

[0007] Further optimization: Both ends of the cross disc shaft are designed with arc-shaped walls that mate with the inner top surface of the piston.

[0008] Further optimization: The opposing clamping assembly includes an L-shaped upright frame, which is fixedly installed on the frame and located between the active roller assembly and the driven roller assembly. A pneumatic slide is installed on one outer wall of the L-shaped upright frame, and an L-shaped cross arm is installed on the moving end of the pneumatic slide. Two dual-axis cylinders are mirror-symmetrically installed inside the L-shaped cross arm. A vertically downward extending side plate is fixedly installed on the driving end of the dual-axis cylinder, and a rubber rod is rotatably installed on the outer wall of the side plate near the cross disc shaft.

[0009] Further optimization: The extension and retraction drive direction of the dual-axis cylinder is parallel to the extension direction of the axis of the cross disc shaft, and the two dual-axis cylinders are mirror-symmetrical about the vertical center reference plane of the cross disc shaft.

[0010] Further optimization: One end of the rubber rod is provided with a concave surface that matches the outer top surface of the piston to be tested.

[0011] Further optimization: The pneumatic pressure plate assembly includes a cylinder frame fixedly mounted on the frame and located on both sides of the outer circular surface of the cross disc shaft. A single-axis cylinder is fixedly mounted on one outer wall of the cylinder frame. A U-shaped head is fixedly mounted on the top of the piston rod of the single-axis cylinder. A Z-shaped arm is mounted on the upper end of the cylinder frame through a hinge shaft. A roller is rotatably mounted at the upper end of the Z-shaped arm. The roller is in movable cooperation with the cross disc shaft.

[0012] Further optimization: The cylinder frame has an inclined wall on the side away from the annular groove, and the single-shaft cylinder is installed on the inclined wall; a straight groove is opened on the end of the Z-arm away from the roller, and a pin is fixed inside the U-shaped head, with the pin passing through the straight groove.

[0013] Further optimization: The adjustable bracket includes two rails fixed to the top of the frame, a T-shaped platform is slidably installed below the two rails, and a support frame is slidably installed at the bottom of the T-shaped platform along the width direction of the frame. The terahertz thickness measuring probe is installed in the circumferential frame. The sliding direction of the T-shaped platform is parallel to the axis of the cross disc shaft.

[0014] This invention also provides a non-destructive testing method for engine parts based on intelligent sensors. Using the aforementioned non-destructive testing device for engine parts based on intelligent sensors, the method includes the following steps: S101: The two pistons to be tested are respectively fitted onto the two ends of the cross disc shaft with their skirts facing each other, and the cross disc shaft with the pistons assembled is embedded into the annular groove of the active roller assembly and the driven roller assembly. The pneumatic pressure plate assemblies on the left and right sides are activated through the control panel. Both pneumatic pressure plate assemblies apply load smoothly to the outer circumference of the cross disc shaft from the radial direction, and firmly press the entire shaft system together with the pistons onto the active roller assembly and the driven roller assembly. The clamping parts of the opposing clamping assemblies move synchronously from both sides and abut against the outer surface of the top of the two pistons to provide additional axial constraint. S102: Adjust the two terahertz thickness probes mounted on the adjustable bracket so that the terahertz thickness probes are roughly aligned with the area to be measured on the outer circumference of the piston, and ensure that the detection end of the terahertz thickness probe is aligned with and perpendicular to the tangent of the outer circle of the piston. S103: Set the rotation speed of the active roller assembly to drive the cross disc shaft and piston on the control panel. The piston rotates synchronously and smoothly around its central axis. The terahertz thickness probe works continuously in its fixed position. As the piston rotates, the terahertz thickness probe performs continuous discrete point thickness data acquisition on the entire circumference surface of the piston's outer circumference at the current position. After completing one scan, the operator fine-tunes the adjustable bracket to move the two terahertz thickness probes along the piston axis to the position of the next circumference to be measured. This cycle is repeated to perform the detection operation. S104: After the inspection is completed, stop the drive of the active roller assembly until the cross disc shaft and piston are completely stationary. In the reverse order of clamping, release the limiting positions of each component on the cross disc shaft and piston. During the scanning process, the raw signals and thickness data collected by the two terahertz thickness probes are transmitted in real time to the host of the terahertz thickness gauge via cable. The operator needs to confirm on the host that the data of all planned scanning points have been completely acquired and make a preliminary judgment on the coating thickness.

[0015] The present invention, by adopting the above technical solution, has at least the following beneficial effects: 1. In this invention, the two piston workpieces to be measured are first mounted on the cross disc shaft with the piston top facing outward. Then, the cross disc shaft with two pistons is embedded into the annular groove of the roller body of the active roller assembly and the driven roller assembly. The pneumatic pressure plate assemblies on the left and right sides apply pressure to the cross disc shaft, while the opposing clamping assembly applies axial clamping force to the piston at the piston top. After the active roller assembly drives the cross disc shaft and piston to rotate slowly, the operator adjusts the axial position of the terahertz thickness probe through the adjustable bracket to complete the non-destructive testing of the piston coating. Throughout the scanning process, the geometric relationship between the terahertz thickness probe and the piston workpiece can be maintained stably, eliminating the angle and distance errors introduced by changes in the previous manual surrounding operation posture, ensuring that each measurement data is obtained under the same ideal physical conditions, and ensuring the consistency and comparability of the measurement data.

[0016] 2. In this invention, the piston is mounted on the cross disc shaft and fixed with the top facing outward. Then, the active and driven roller assembly, the pneumatic pressure plate assembly, and the opposing clamping assembly are used for precise centering and clamping, eliminating any slight displacement or vibration of the workpiece during the detection process. This creates a static and stable measurement target for the terahertz thickness probe. Furthermore, the rotational motion of the piston itself allows each point on its cylindrical surface to enter the probe's detection area in a controllable manner. The operator only needs to use the adjustable bracket to precisely adjust the terahertz thickness probe to be perpendicular to the piston surface and maintain a constant optimal detection distance.

[0017] 3. In this invention, the terahertz thickness probe can acquire complete thickness data around the entire circumference at each fixed position along the axial direction as the piston rotates. It can acquire coating information of the entire test area on the outer circumference of the piston without omission. Compared with the previous manual detection, which may result in uneven density of measurement points or omission of key areas due to negligence or subjectivity, the dataset generated by the mechanical scanning method is complete and the spatial position is accurately corresponding, which can reliably construct a more accurate coating thickness distribution map. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of an embodiment of the present invention. Figure 1 ; Figure 2 This is a front view of the overall structure of an embodiment of the present invention; Figure 3 This is a side view of the overall structure of an embodiment of the present invention; Figure 4 This is a three-dimensional structural diagram of an embodiment of the present invention. Figure 2 ; Figure 5 This is a three-dimensional structural diagram of an embodiment of the present invention. Figure 3 ; Figure 6 for Figure 3 A three-dimensional sectional view of the structure along the BB direction; Figure 7 This is a schematic diagram of the structure in the case of the cross disc shaft being removed in an embodiment of the present invention; Figure 8 This is a schematic diagram of the cross-shaped shaft in an embodiment of the present invention; Figure 9 for Figure 2 A three-dimensional sectional view of the structure along the AA direction; Figure 10 for Figure 9 A magnified view of a section at point A in the middle; Figure 11 This is a three-dimensional structural diagram of the adjustable bracket in an embodiment of the present invention.

[0019] In the diagram: 1-Frame; 101-Rectangular groove; 2-Active roller assembly; 21-Roller frame; 22-Servo motor; 23-I-shaped hollow cylinder; 24-Glue-coated roller; 3-Driven roller assembly; 4-Annular groove; 5-Cross disc shaft; 6-Opposing clamping assembly; 61-L-shaped upright; 62-Pneumatic slide; 63-L-shaped cross arm; 64-Side plate; 65-Glue rod; 66-Dual-axis cylinder ; 7-Pneumatic pressure plate assembly; 71-Cylinder frame; 711-Sloping wall; 72-Single-axis cylinder; 73-U-shaped head; 74-Pin rod; 75-Z-shaped arm; 76-Straight groove; 77-Roller; 8-Air pump station; 9-Control panel; 10-Adjustable bracket; 1001-Railway; 1002-T-shaped platform; 1003-Support; 1004-U-shaped frame; 11-Terahertz thickness probe. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0021] like Figures 1 to 5 As shown, a non-destructive testing device for engine parts based on intelligent sensors includes a frame 1. An active roller assembly 2 and a driven roller assembly 3 are respectively installed at the front and rear positions of the top of the frame 1. A counter-clamping assembly 6 is provided between the active roller assembly 2 and the driven roller assembly 3. Annular grooves 4 are formed on the outer peripheral surfaces of the rollers of both the active roller assembly 2 and the driven roller assembly 3. A cross disc shaft 5 is engaged between two annular grooves 4. Test pistons are fitted at both ends of the cross disc shaft 5, with the skirts of the two test pistons facing each other. The counter-clamping assembly 6 applies a force to the outer top surface of the pistons in the axial direction. Pneumatic pressure plate assemblies 7 are installed at the top of the frame 1 on both sides of the cross disc shaft 5. The pneumatic pressure plate assemblies 7 apply a load to the cross disc shaft 5 to ensure that the cross disc shaft 5 is pressed tightly between the active roller assembly 2 and the driven roller assembly 3.

[0022] A rectangular through slot 101 is provided at the top of the frame 1 below the cross disc shaft 5. Two terahertz thickness probes 11 are arranged below the rectangular through slot 101. Two adjustable brackets 10 are installed on the top of the frame 1 to support the terahertz thickness probes 11 and drive the terahertz thickness probes 11 to move axially.

[0023] An air pump station 8 is installed on one side of the bottom of the frame 1. The air pump station 8 is used to supply pneumatic power to the opposing clamping assembly 6 and the pneumatic pressure plate assembly 7. The air outlet of the air pump station 8 is connected to the opposing clamping assembly 6 and the pneumatic pressure plate assembly 7 through a control pipeline.

[0024] In this embodiment, the control pipeline is existing technology and will not be described in detail here. Its main function is to guide the air source output by the air pump station 8 to the opposing clamping assembly 6 and the pneumatic pressure plate assembly 7 after being guided by the control pipeline, and to adjust and control the air pressure and airflow direction through the control valve assembly, thereby realizing the independent operation of the opposing clamping assembly 6 and the pneumatic pressure plate assembly 7.

[0025] A control panel 9 is installed on one side of the frame 1. The control output terminal of the control panel 9 is electrically connected to the control input terminal of the active roller assembly 2 and the air pump station 8. The control panel 9 outputs control signals to independently control the operation of the active roller assembly 2 and the air pump station 8. The air pump station 8 outputs a high-pressure air source and supplies pneumatic power to the opposing clamping assembly 6 and the pneumatic pressure plate assembly 7 through the control pipeline. The control pipeline can also automatically control the opposing clamping assembly 6 and the pneumatic pressure plate assembly 7 to work independently according to the actual working conditions.

[0026] like Figure 6 , Figure 7 and Figure 8 As shown, the active roller assembly 2 includes a roller frame 21, a servo motor 22, an I-shaped hollow cylinder 23, and a rubber-coated roller 24. The roller frame 21 is fixedly installed at the front of the top of the frame 1. The servo motor 22 is installed on one side of the outer wall of the roller frame 21. The I-shaped hollow cylinder 23 is fixedly installed on the power output shaft of the servo motor 22. The rubber-coated roller 24 is provided on the other side of the outer wall of the roller frame 21, and the end of the rubber-coated roller 24 is bolted to the end of the I-shaped hollow cylinder 23.

[0027] In this embodiment, the annular groove 4 is formed on the outer peripheral surface of the rubber-coated roller 24.

[0028] In this embodiment, the active roller assembly 2 and the driven roller assembly 3 have roughly the same structure, the difference being that the active roller assembly 2 has a servo motor 22, while the driven roller assembly 3 does not need to be equipped with a servo motor 22.

[0029] The servo motor 22 operates according to the direction, speed, angle, and response time set by the control panel 9 to drive the I-shaped hollow cylinder 23 and the rubber-coated roller 24 to rotate. Since the cross disc shaft 5 is embedded in the annular groove 4 and contacts the rubber-coated roller 24, and the cross disc shaft 5 can rotate under the pressure load of the pneumatic pressure plate assembly 7 by relying on the friction between it and the rubber-coated roller 24, the driven roller assembly 3 provides symmetrical auxiliary support and correction during this process, limiting the left and right and up and down sway of the cross disc shaft 5 on the horizontal plane, while allowing it to rotate freely, ensuring that the piston rotates around a stable and definite axis to achieve uniform scanning in the subsequent circumferential direction.

[0030] Both ends of the cross-shaped shaft 5 are designed with arc-shaped walls that mate with the inner top surface of the piston. The arc-shaped walls allow the central axis of the cross-shaped shaft 5 to coincide with the central axis of the piston, making it convenient to place the piston on the cross-shaped shaft 5.

[0031] The opposing clamping assembly 6 includes an L-shaped upright 61, which is fixedly installed on the frame 1 and located between the active roller assembly 2 and the driven roller assembly 3. A pneumatic slide 62 is installed on one outer wall of the L-shaped upright 61. An L-shaped cross arm 63 is installed on the moving end of the pneumatic slide 62. Two dual-axis cylinders 66 are mirror-symmetrically installed inside the L-shaped cross arm 63. A vertically downward extending side plate 64 is fixedly installed on the driving end of the dual-axis cylinder 66. A rubber rod 65 is rotatably installed on the outer wall of the side plate 64 near the cross disc shaft 5.

[0032] In this embodiment, the extension and retraction drive direction of the dual-axis cylinder 66 is parallel to the axial extension direction of the cross disc shaft 5, and the two dual-axis cylinders 66 are mirror-symmetrical about the vertical center reference plane of the cross disc shaft 5.

[0033] In this embodiment, one end of the glue rod 65 is provided with a concave surface that matches the outer top surface of the piston to be tested.

[0034] With this design, when using the opposing clamping assembly 6, the pneumatic slide 62 on the outer wall of the L-shaped stand 61 controls the vertical lifting and lowering movement of the L-shaped cross arm 63 and the dual-axis cylinder 66, adjusting the vertical height of the rubber rod 65 until the central axis of the rubber rod 65 coincides with the central axis of the cross disc shaft 5 and the piston. The dual-axis cylinder 66 drives the side plate 64 and the rubber rod 65 to move closer to the outer top surface of the piston until the end of the rubber rod 65 contacts the outer top surface of the piston, thereby providing axial auxiliary fixation and counteracting the tilt or slight movement of the piston relative to the cross disc shaft 5 that may occur under its own weight or small unbalanced force.

[0035] like Figure 9 , Figure 10 and Figure 11 As shown, the pneumatic pressure plate assembly 7 includes a cylinder frame 71 fixedly mounted on the frame 1 and located on both sides of the outer circular surface of the cross disc shaft 5. A single-shaft cylinder 72 is fixedly mounted on one outer wall of the cylinder frame 71. A U-shaped head 73 is fixedly mounted on the top of the piston rod of the single-shaft cylinder 72. A Z-shaped arm 75 is mounted on the upper end of the cylinder frame 71 through a hinge shaft. A roller 77 is rotatably mounted at the upper end of the Z-shaped arm 75. The roller 77 is in movable cooperation with the cross disc shaft 5.

[0036] The cylinder frame 71 has an inclined wall 711 on the side away from the annular groove 4, and the single-shaft cylinder 72 is mounted on the inclined wall 711; the Z-arm 75 has a straight groove 76 on the end away from the roller 77, and a pin 74 is fixed inside the U-shaped head 73. The pin 74 passes through the straight groove 76 and is movably engaged with the straight groove 76.

[0037] With this design, when the operator uses the pneumatic pressure plate assembly 7 to limit the cross disc shaft 5, the single-axis cylinder 72 pushes the U-head 73 to move. Since the pin 74 is located in the straight groove 76 of the Z-arm 75, the U-head 73 and the pin 74 force the Z-arm 75 to flip down around the hinge axis, thereby using the roller 77 to apply force to the cross disc shaft 5 to eliminate the possible axial movement of the cross disc shaft 5 and firmly press the cross disc shaft 5 between the active roller assembly 2 and the driven roller assembly 3 to ensure that the driving friction is sufficient and stable.

[0038] The adjustable bracket 10 includes two rails 1001 fixed to the top of the frame 1. A T-shaped platform 1002 is slidably installed below the two rails 1001. A support 1003 is slidably installed at the bottom of the T-shaped platform 1002 along the width direction of the frame 1. A U-shaped frame 1004 is hinged inside the support 1003. The terahertz thickness measuring probe 11 is installed in the U-shaped frame 1004.

[0039] In this embodiment, the sliding direction of the T-shaped stage 1002 is parallel to the axial direction of the cross disc shaft 5.

[0040] With this design, when using the adjustable bracket 10, the operator first adjusts the sway angle of the terahertz thickness probe 11 by rotating the U-shaped frame 1004, so that the detection end of the terahertz thickness probe 11 is precisely perpendicular to the tangential plane of the piston skirt being measured. During the test, the axial position of the terahertz thickness probe 11 can be changed by sliding it on the track 1001 via the T-shaped stage 1002, thereby improving the detection range.

[0041] This invention also provides a non-destructive testing method for engine parts based on intelligent sensors. Using the aforementioned non-destructive testing device for engine parts based on intelligent sensors, the method includes the following steps: S101: The two pistons to be tested are respectively fitted onto the two ends of the cross disc shaft 5 with their skirts facing each other, and the cross disc shaft 5 with the pistons assembled is embedded into the annular groove 4 of the active roller assembly 2 and the driven roller assembly 3. The pneumatic pressure plate assemblies 7 on the left and right sides are started through the control panel 9. Both pneumatic pressure plate assemblies 7 apply load smoothly to the outer circumference of the cross disc shaft 5 from the radial direction, and firmly press the entire shaft system together with the pistons onto the active roller assembly 2 and the driven roller assembly 3. The clamping parts of the opposing clamping assembly 6 move synchronously from both sides and abut against the outer surface of the top of the two pistons to provide additional axial constraint.

[0042] In step S101, the working principle of the pneumatic pressure plate assembly 7 is as follows: the single-axis cylinder 72 pushes the U-head 73 to move. Since the pin 74 is located in the straight groove 76 of the Z-arm 75, the U-head 73 and the pin 74 force the Z-arm 75 to flip down around the hinge axis, thereby using the roller 77 to apply force to the cross disc shaft 5, so as to firmly press the cross disc shaft 5 between the active roller assembly 2 and the driven roller assembly 3, ensuring that the driving friction is sufficient and stable.

[0043] In step S101, the working principle of the opposing clamping assembly 6 is as follows: First, the pneumatic slide 62 controls the L-shaped horizontal arm 63 and the dual-axis cylinder 66 to move vertically up and down until the central axis of the rubber rod 65 coincides with the central axis of the cross disc shaft 5 and the piston. Then, the dual-axis cylinder 66 drives the side plate 64 and the rubber rod 65 to move closer to the outer top surface of the piston until the end of the rubber rod 65 contacts the outer top surface of the piston, thereby achieving auxiliary fixation of the piston and improving the positioning effect.

[0044] S102: Adjust the two terahertz thickness probes 11 mounted on the adjustable bracket 10 so that the terahertz thickness probes 11 are roughly aligned with the area to be measured on the outer circumference of the piston, and ensure that the detection end of the terahertz thickness probe 11 is aligned with and perpendicular to the tangent of the outer circle of the piston.

[0045] S103: Set the rotation speed of the active roller assembly 2 to drive the cross disc shaft 5 and piston on the control panel 9. The piston rotates synchronously and smoothly around its central axis. The terahertz thickness probe 11 works continuously in its fixed position. As the piston rotates, the terahertz thickness probe 11 performs continuous discrete point thickness data acquisition on the entire circumference surface of the piston's outer circumference at the current position. After completing one scan, the operator fine-tunes the adjustable bracket 10 to move the two terahertz thickness probes 11 along the piston axis to the position of the next circumference to be measured. This process is repeated cyclically to perform the detection operation.

[0046] In step S103, the working principle of the active roller assembly 2 is as follows: the servo motor 22 works according to the direction, speed, angle and response time set by the control panel 9 to drive the I-shaped hollow cylinder 23 and the rubber-coated roller 24 to rotate. At this time, with the assistance of the driven roller assembly 3, the rubber-coated roller 24 can drive the cross disc shaft 5 and the piston to rotate on a stable and definite axis, which is convenient to use.

[0047] In steps S102 and S103, the working principle of the adjustable bracket 10 is as follows: by rotating the U-shaped frame 1004, the sway angle of the detection end of the terahertz thickness probe 11 can be adjusted so that the detection end of the terahertz thickness probe 11 is precisely perpendicular to the tangential plane of the piston skirt to be measured. During the detection process, the axial position of the terahertz thickness probe 11 can be changed by sliding on the track 1001 through the T-shaped stage 1002, thereby improving the detection range.

[0048] S104: After the test is completed, stop the drive of the active roller assembly 2 until the cross disc shaft 5 and the piston are completely stationary. In the reverse order of clamping, release the limiting position of each assembly on the cross disc shaft 5 and the piston. During the scanning process, the raw signals and thickness data collected by the two terahertz thickness probes 11 are transmitted to the host of the terahertz thickness gauge in real time through the cable. The staff needs to confirm on the host that the data of all planned scanning points have been completely acquired and make a preliminary judgment on the coating thickness.

[0049] In addition to this embodiment, the terahertz thickness probe 11 can also be replaced by other smart sensors, including distance sensors, image sensors, ultrasonic detection probes, etc. The distance sensor can be used to detect the geometric dimensions such as the diameter and coaxiality of the piston's outer surface; the image sensor is used to collect the microstructure of the piston's outer surface, which facilitates the subsequent analysis of the microstructure of the piston's outer surface; and the ultrasonic detection probe is used to detect whether there are defects such as cracks inside the piston.

[0050] The distance sensor, image sensor, ultrasonic detection probe, and other intelligent sensors can all be mounted on the U-shaped frame 1004 of the adjustable bracket 10.

[0051] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A non-destructive testing device for engine parts based on intelligent sensors, characterized in that: The machine includes a frame (1), with a driving roller assembly (2) and a driven roller assembly (3) installed at the front and rear positions of the top of the frame (1), respectively. A counter-clamping assembly (6) is provided between the driving roller assembly (2) and the driven roller assembly (3). Annular grooves (4) are provided on the outer circumferential surfaces of the rollers of both the driving roller assembly (2) and the driven roller assembly (3). A cross disc shaft (5) is clamped between the two annular grooves (4). Test pistons are fitted at both ends of the cross disc shaft (5), with the skirts of the two test pistons facing each other. The counter-clamping assembly (6) is used to apply force to the outer top surface of the piston in the axial direction. Pneumatic pressure plate assemblies (7) are installed at the top of the frame (1) on both sides of the cross disc shaft (5). The pneumatic pressure plate assemblies (7) are used to apply load to the cross disc shaft (5) to ensure the cross disc shaft (5). The disc shaft (5) is pressed between the active roller assembly (2) and the driven roller assembly (3). A rectangular through slot (101) is provided on the frame (1) below the cross disc shaft (5). Two terahertz thickness probes (11) are provided below the rectangular through slot (101). Two adjustable brackets (10) are installed on the top of the frame (1) to support the installation of the terahertz thickness probes (11) and drive the terahertz thickness probes (11) to move axially. An air pump station (8) is installed on one side of the bottom of the frame (1) to supply pneumatic power to the opposing clamping assembly (6) and the pneumatic pressure plate assembly (7). A control panel (9) is installed on one side of the surface of the frame (1). The control output terminal of the control panel (9) is electrically connected to the control input terminal of the active roller assembly (2) and the air pump station (8).

2. The non-destructive testing device for engine parts based on intelligent sensors according to claim 1, characterized in that: The active roller assembly (2) includes a roller frame (21) fixedly installed at the front position of the top of the frame (1). A servo motor (22) is installed on one side of the outer wall of the roller frame (21). An I-shaped hollow cylinder (23) is fixedly installed on the power output shaft of the servo motor (22). A rubber-coated roller (24) is provided on the other side of the outer wall of the roller frame (21). The end of the rubber-coated roller (24) is bolted to the end of the I-shaped hollow cylinder (23). An annular groove (4) is formed on the outer circumferential surface of the rubber-coated roller (24).

3. The non-destructive testing device for engine parts based on intelligent sensors according to claim 2, characterized in that: Both ends of the cross disc shaft (5) are designed with arc-shaped walls that mate with the inner top surface of the piston.

4. The non-destructive testing device for engine parts based on intelligent sensors according to claim 3, characterized in that: The opposing clamping assembly (6) includes an L-shaped stand (61), which is fixedly installed on the frame (1) and located between the active roller assembly (2) and the driven roller assembly (3). A pneumatic slide (62) is installed on one side of the outer wall of the L-shaped stand (61), and an L-shaped cross arm (63) is installed on the moving end of the pneumatic slide (62). Two dual-axis cylinders (66) are mirror-symmetrically installed inside the L-shaped cross arm (63). A vertically downward extending side plate (64) is fixedly installed on the driving end of the dual-axis cylinder (66), and a rubber rod (65) is rotatably installed on the outer wall of the side plate (64) near the cross disc shaft (5).

5. The non-destructive testing device for engine parts based on intelligent sensors according to claim 4, characterized in that: The extension and retraction drive direction of the dual-axis cylinder (66) is parallel to the axial extension direction of the cross disc shaft (5), and the two dual-axis cylinders (66) are mirror-symmetrical about the vertical center reference plane of the cross disc shaft (5).

6. The non-destructive testing device for engine parts based on intelligent sensors according to claim 5, characterized in that: One end of the rubber rod (65) is provided with an inner concave surface that matches the outer top surface of the piston to be tested.

7. The non-destructive testing device for engine parts based on intelligent sensors according to claim 6, characterized in that: The pneumatic pressure plate assembly (7) includes a cylinder frame (71) fixedly mounted on the frame (1) and located on both sides of the outer circular surface of the cross disc shaft (5). A single-shaft cylinder (72) is fixedly mounted on one side of the outer wall of the cylinder frame (71). A U-shaped head (73) is fixedly mounted on the top of the piston rod of the single-shaft cylinder (72). A Z-shaped arm (75) is mounted on the upper end of the cylinder frame (71) through a hinge shaft. A roller (77) is rotatably mounted at the upper end of the Z-shaped arm (75). The roller (77) is in movable cooperation with the cross disc shaft (5).

8. The non-destructive testing device for engine parts based on intelligent sensors according to claim 7, characterized in that: The cylinder frame (71) has an inclined wall (711) on the side away from the annular groove (4), and the single-shaft cylinder (72) is mounted on the inclined wall (711); the Z-arm (75) has a straight slot (76) on the end away from the roller (77), and a pin (74) is fixed inside the U-shaped head (73), and the pin (74) passes through the straight slot (76).

9. The non-destructive testing device for engine parts based on intelligent sensors according to claim 8, characterized in that: The adjustable bracket (10) includes two rails (1001) fixed to the top of the frame (1), a T-shaped platform (1002) is slidably installed below the two rails (1001), a support (1003) is slidably installed at the bottom of the T-shaped platform (1002) along the width direction of the frame (1), and a U-shaped frame (1004) is hinged inside the support (1003). The terahertz thickness probe (11) is installed in the U-shaped frame (1004), and the sliding direction of the T-shaped platform (1002) is parallel to the axis direction of the cross disc shaft (5).

10. A method for non-destructive testing of engine parts based on intelligent sensors, using the engine parts non-destructive testing device based on intelligent sensors as described in any one of claims 1-9, characterized in that: Includes the following steps: S101: The two pistons to be tested are respectively fitted onto the two ends of the cross disc shaft (5) with their skirts facing each other, and the cross disc shaft (5) with the pistons assembled is embedded into the annular groove (4) of the active roller assembly (2) and the driven roller assembly (3). The pneumatic pressure plate assemblies (7) on the left and right sides are started through the control panel (9). Both pneumatic pressure plate assemblies (7) apply load smoothly to the outer circumference of the cross disc shaft (5) from the radial direction, and firmly press the entire shaft system together with the pistons onto the active roller assembly (2) and the driven roller assembly (3). The clamping parts of the opposing clamping assembly (6) move synchronously from both sides and abut against the top outer surface of the two pistons to provide additional axial constraint. S102: Adjust the two terahertz thickness probes (11) mounted on the adjustable bracket (10) so that the terahertz thickness probes (11) are roughly aligned with the area to be measured on the outer circumference of the piston, and ensure that the detection end of the terahertz thickness probes (11) is aligned with and perpendicular to the tangent of the outer circle of the piston. S103: Set the rotation speed of the active roller assembly (2) driving the cross disk shaft (5) and piston on the control panel (9). The piston rotates synchronously and smoothly around its central axis. The terahertz thickness probe (11) works continuously in its fixed position. As the piston rotates, the terahertz thickness probe (11) performs continuous discrete point thickness data acquisition on the entire circumference surface of the piston's outer circumference at the current position. After completing one scan, the operator fine-tunes the adjustable bracket (10) so that the two terahertz thickness probes (11) move along the piston axis to the position of the next circumference to be measured. This cycle is repeated to perform the detection operation. S104: After the test is completed, stop the drive of the active roller assembly (2) until the cross disc shaft (5) and the piston are completely stationary. In the reverse order of clamping, release the limit of each component on the cross disc shaft (5) and the piston. During the scanning process, the original signals and thickness data collected by the two terahertz thickness probes (11) are transmitted to the host of the terahertz thickness gauge in real time through the cable. The staff needs to confirm on the host that the data of all planned scanning points have been completely acquired and make a preliminary judgment on the coating thickness.

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