A system and method for measuring the thickness of large curved thin-walled alloy workpieces

Abstract

The application discloses a system and method for measuring the thickness of large curved thin-wall alloy workpieces, and the system comprises a measuring device and a supply and cleaning system. The measuring device is used for being attached to the wall of the workpiece to measure the thickness of the workpiece. The supply and cleaning system is used for spraying coupling agent on the specified position of the workpiece before measuring the thickness of the workpiece and cleaning the specified position of the workpiece after the measurement. The supply and cleaning system comprises a plurality of coupling agent nozzles, a coupling agent cylinder, and a jet pipe. The coupling agent nozzles are fixed to the outer wall of the probe barrel and are uniformly arranged. The inlet of the coupling agent cylinder is connected with an external compressed gas system, and the outlet of the coupling agent cylinder is connected with each coupling agent nozzle through a pipeline. The jet pipe is fixed to the periphery of the probe barrel, the inlet of the jet pipe is connected with the external compressed gas system, and the outlet of the jet pipe is a strip-shaped and is close to the specified position of the workpiece. The point position control accuracy of the measuring efficiency is greatly improved. The measuring time can be shortened from several days to several hours or even tens of minutes.

Description

Technical Field

[0001] This invention belongs to the field of measuring large curved thin-walled workpieces, and particularly relates to a system and method for measuring the thickness of large curved thin-walled alloy workpieces. Background Technology

[0002] In the processing, manufacturing, and measurement of large, thin-walled components, the thickness accuracy is a crucial indicator. Taking a certain type of 90° bent high-temperature alloy gas pipe as an example, within the range of 0° to 90°, the wall thickness must be measured every 10°, and the error between each measurement and the standard value must not exceed 0.1mm. This is because the thickness of a large, thin-walled part determines the material distribution of the entire workpiece, which in turn determines its rotational inertia, bending resistance, and torsional resistance, thus affecting the overall performance of the workpiece. Therefore, accurate measurement and control of the wall thickness of large, thin-walled parts is particularly important. Only with sufficiently accurate and rapid measurement methods can the final workpiece meet the dimensional and accuracy requirements.

[0003] With the rapid development of the aerospace industry, higher requirements have been placed on the precision and quality of components. Large, thin-walled parts have numerous measurement points, demanding high measurement accuracy. Traditional manual measurement methods suffer from two main shortcomings: firstly, the measurement point position is primarily controlled manually, making precise control impossible; secondly, the constantly changing pressure during manual sensor pressing causes fluctuations in the measurement results, making accurate readings difficult. Therefore, these methods fail to meet requirements in terms of both measurement efficiency, quality, and accuracy. Summary of the Invention

[0004] The purpose of this invention is to provide a system and method for measuring the thickness of large curved thin-walled alloy workpieces, so as to solve the problems of low automation, low measurement efficiency and large error in existing manual measurement methods.

[0005] The present invention adopts the following technical solution: a system for measuring the thickness of large curved thin-walled alloy workpieces, comprising: a measuring device and a supply and cleaning system. The measuring device is used to attach to the wall surface of the workpiece to measure the thickness of the workpiece. The supply and cleaning system is used to spray a coupling agent on a designated position of the workpiece before measuring the thickness of the workpiece and to clean the designated position of the workpiece after measurement.

[0006] The measuring device includes:

[0007] An ultrasonic probe, the lower end of which is attached to the surface of a workpiece to measure its thickness.

[0008] The probe sleeve is fitted around the ultrasonic probe.

[0009] The supply and removal system includes:

[0010] Multiple coupling agent nozzles, fixed to the outer wall of the probe cylinder and evenly distributed, are used to spray coupling agent onto designated locations on the workpiece to be measured.

[0011] The coupling cylinder has its inlet connected to an external compressed gas system and its outlet connected to each coupling nozzle via a pipeline. It is used to supply coupling agent to the coupling nozzle under the push of compressed gas.

[0012] The jet pipe is fixed to the periphery of the probe cylinder. Its inlet is connected to the external compressed gas system, and its outlet is strip-shaped and located near the designated position on the workpiece.

[0013] Furthermore, it also includes:

[0014] The moving mechanism, located on the upper side of the ultrasonic probe and fixedly connected to the probe cylinder, is used to drive the ultrasonic probe to move radially and axially and reach the designated wall surface of the workpiece.

[0015] Furthermore, the mobile mechanism includes:

[0016] Positioning plate,

[0017] The guide frame is fixedly connected to the probe cylinder.

[0018] The stepper motor is fixed on the positioning plate.

[0019] The first gear is connected to the output shaft of the stepper motor and is used to rotate under the drive of the stepper motor.

[0020] The second gear meshes with the first gear and is used to rotate under the drive of the first gear.

[0021] The screw has its upper end fixedly connected to the center of the second gear and its lower end connected to the guide frame. It is used to move axially relative to the guide frame under the drive of the second gear, thereby driving the ultrasonic probe to move axially closer to or away from the workpiece wall to be tested.

[0022] Furthermore, the guide frame is connected to an industrial robot via a flange, and the industrial robot is used to drive the ultrasonic probe to move radially through the guide frame.

[0023] Furthermore, the guide frame includes:

[0024] Upper guide plate, set horizontally.

[0025] The lower guide plate is horizontally positioned and fixedly connected to the upper guide plate via a vertical plate.

[0026] The fixing plate is located on the upper side of the upper guide plate and the lower side of the second gear. A positioning hole is opened at the center of the plate. The positioning hole is used for the screw to pass through and to position the screw so that the axis of the screw coincides with the axis of the ultrasonic probe.

[0027] Furthermore, the guide frame also includes:

[0028] Multiple guide posts are arranged around the screw rod. Their upper ends pass through the upper guide plate and are fixedly connected to the fixing plate, and their lower ends pass through the lower guide plate and are fixedly connected to the probe cylinder.

[0029] Furthermore, the positioning plate is L-shaped, with its horizontal section located between the fixed plate and the second gear. The stepper motor is fixed on the vertical section of the positioning plate, and the vertical section of the positioning plate abuts against the side wall of the upright plate, thereby ensuring the accuracy of the screw's axial movement.

[0030] Furthermore, the supply and removal system also includes:

[0031] The connecting plate has one end fixedly connected to the coupling agent cylinder and the other end fixedly connected to the guide frame.

[0032] Furthermore, the supply and purging system also includes: a solenoid valve for supplying compressed gas from an external compressed gas system to the coupling agent cylinder, for supplying compressed gas from an external compressed gas system to the jet pipe, and for depressurizing the cylinder when the coupling agent cylinder needs maintenance or the addition of coupling agent.

[0033] A method for measuring the thickness of large curved thin-walled alloy workpieces comprises the following steps:

[0034] The measuring device is moved to a designated position close to the workpiece using a moving mechanism.

[0035] Coupling agent is sprayed onto a designated location on the workpiece under test through the coupling agent nozzle of the supply and removal system.

[0036] Move the measuring device until the ultrasonic probe is pressed against the surface of the point to be measured on the workpiece.

[0037] The thickness of the workpiece to be measured is measured using a measuring device.

[0038] Move the measuring device back to the designated position close to the workpiece to be measured.

[0039] Compressed gas is blown out at a designated location on the workpiece through a jet nozzle to clean the workpiece surface.

[0040] The beneficial effects of this invention are as follows: The measuring device of this invention can be combined with an industrial robot to achieve one-time clamping and positioning of the workpiece, with high measurement accuracy. It can be directly measured after the workpiece is processed, and there is no need to move the workpiece during the measurement process, which improves measurement accuracy, shortens the processing cycle, reduces scrap rate, and lowers raw material costs. By setting a radial protection mechanism, the ultrasonic probe is "suspended" and installed in the probe cylinder, giving the ultrasonic probe a certain angle of automatic alignment with the curved surface normal. By setting an axial protection mechanism, a downward thrust can be generated on the protective elastic element to prevent the ultrasonic probe from being damaged by impact and compression with the workpiece to be measured.

[0041] The present invention greatly improves the accuracy of point control in measuring efficiency; during the working process, it can be adapted to the measurement of different types of workpieces through industrial robot programming, realizing automated online measurement, and the measurement time can be shortened from several days by manual measurement to several hours or even tens of minutes.

[0042] This invention efficiently integrates the measuring device and the supply and removal system into a single end effector, greatly improving the measurement efficiency of the automated measuring system. The overall structure is compact, the working performance is stable, and the production cost is low. Attached Figure Description

[0043] Figure 1 This is a schematic diagram of the structure of the present invention;

[0044] Figure 2 This is a schematic diagram of the structure of the present invention;

[0045] Figure 3 This is a schematic diagram of the measuring device of the present invention;

[0046] Figure 4 This is a schematic diagram of the radial protection mechanism of the measuring device of the present invention.

[0047] The components include: 1. Ultrasonic probe; 11. Probe cylinder; 2. Radial protection mechanism; 21. Supporting elastic element; 22. Arc plate; 3. Axial protection mechanism; 31. Lower protective ring; 32. Upper protective ring; 33. Protective elastic element; 34. Axial elastic element; 41. Coupling agent nozzle; 42. Coupling agent cylinder; 43. Jet pipe; 44. Solenoid valve; 5. Moving mechanism; 51. Guide frame; 52. Stepper motor; 53. First gear; 54. Second gear; 55. Screw; 56. Upper guide plate; 57. Lower guide plate; 58. Fixing plate; 59. Guide column; 6. Connecting plate; 7. Positioning plate. Detailed Implementation

[0048] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0049] It should be noted that the structures, proportions, sizes, etc., shown in the accompanying drawings of this specification are only used to complement the content disclosed in the specification for those skilled in the art to understand and read, and are not intended to limit the conditions under which the present invention can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and objectives that the present invention can produce, should still fall within the scope of the technical content disclosed in the present invention.

[0050] In the description of this invention, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Without substantial changes to the technical content, they should also be considered as within the scope of this invention.

[0051] This invention discloses a system for measuring the thickness of large curved, thin-walled alloy workpieces, such as... Figure 1 and Figure 2 As shown, it includes a measuring device and a supply and cleaning system. The measuring device is used to attach to the wall of the workpiece to measure the thickness of the workpiece. The supply and cleaning system is used to spray a coupling agent on a designated location of the workpiece before measuring the workpiece thickness and to clean the designated location of the workpiece after measurement.

[0052] The measuring device includes an ultrasonic probe 1 and a probe cylinder 11. The lower end of the ultrasonic probe 1 is used to attach to the wall of the workpiece to measure its thickness. The probe cylinder 11 is sleeved around the ultrasonic probe 1.

[0053] like Figure 1 and Figure 2 As shown, the supply and removal system includes: multiple coupling agent nozzles 41, a coupling agent cylinder 42, and an air jet pipe 43. The multiple coupling agent nozzles 41 are fixed to the outer wall of the probe cylinder 11 and are evenly distributed. The multiple coupling agent nozzles 41 are used to spray coupling agent onto designated locations on the workpiece to be measured. The inlet of the coupling agent cylinder 42 is connected to an external compressed gas system, and the outlet of the coupling agent cylinder 42 is connected to each coupling agent nozzle 41 through a pipeline. The coupling agent cylinder 42 is used to push the coupling agent within it towards the coupling agent nozzles 41 under the push of compressed gas, and to supply coupling agent to the coupling agent nozzles 41. The air jet pipe 43 is fixed to the periphery of the probe cylinder 11. The inlet of the air jet pipe 43 is connected to an external compressed gas system, and the outlet of the air jet pipe 43 is strip-shaped and located close to the designated location on the workpiece. Because the outlet of the air jet pipe 43 is strip-shaped, the distance between the outlet of the air jet pipe 43 and the working surface of the ultrasonic probe 1 can be adjusted according to the actual installation position to achieve the best coupling agent removal effect.

[0054] The supply and purging system also includes: a solenoid valve 44, which is used to deliver compressed gas from an external compressed gas system to the coupling agent cylinder 42, and also to deliver compressed gas from the external compressed gas system to the jet pipe 43. The solenoid valve 44 is also used to depressurize the cylinder when the coupling agent cylinder 42 needs maintenance or the addition of coupling agent.

[0055] The supply and removal system also includes a moving mechanism 5, which is located on the upper side of the ultrasonic probe 1 and is fixedly connected to the probe cylinder 11. The moving mechanism 5 is used to drive the ultrasonic probe 1 to move radially and axially and reach the designated wall surface of the workpiece.

[0056] The moving mechanism 5 includes: a positioning plate 7, a guide frame 51, a stepper motor 52, a first gear 53, a second gear 54, and a screw 55. The guide frame 51 is fixedly connected to the probe cylinder 11. The stepper motor 52 is fixed on the positioning plate 7. The first gear 53 is connected to the output shaft of the stepper motor 52 and is used to rotate under the drive of the stepper motor 52. The second gear 54 meshes with the first gear 53 and is used to rotate under the drive of the first gear 53. The number of teeth of the first gear 53 and the second gear 54 are 26 and 11 respectively, and the transmission ratio is 2.36. The upper end of the screw 55 is fixedly connected to the center of the second gear 54, and the lower end of the screw 55 is connected to the guide frame 51. The screw 55 is used to move axially relative to the guide frame 51 under the drive of the second gear 54, thereby driving the ultrasonic probe 1 to move axially closer to or away from the workpiece wall to be tested.

[0057] The second gear 54 engages with the keyway end of the screw 55, achieving axial positioning via the step at the keyway end of the screw 55 and fixation via a flat key. The first gear 53 is positioned and fixed with the power output shaft of the 42-type stepper motor 52 via a flat key. The 42-type stepper motor 52 is fixedly connected to the positioning plate 7. The stepper motor 52 can adjust the center distance of the gear transmission system. During assembly, the center distance between the first gear 53 and the second gear 54 needs to be adjusted to the point where the pitch circles of the two gears are tangent to ensure gear meshing accuracy.

[0058] The guide frame 51 is also connected to the industrial robot via a flange. The industrial robot is used to drive the ultrasonic probe 1 to move radially via the guide frame 51. Although the industrial robot can replace the lead screw system of the stepper motor 52 to complete the action of pressing down the ultrasonic probe, determining the appropriate pressing direction and pressing stroke is cumbersome to program. If an error occurs, the ultrasonic probe 1 will be damaged. Therefore, the industrial robot is used to align with the measurement direction in the axial direction. The lead screw system of the stepper motor 52, in conjunction with the pressure sensor, can effectively avoid this problem when pressing down.

[0059] The guide frame 51 includes an upper guide plate 56, a lower guide plate 57, and a fixing plate 58. The upper guide plate 56 is horizontally arranged, and the lower guide plate 57 is horizontally arranged. The lower guide plate 57 is fixedly connected to the upper guide plate 56 through a vertical plate. The fixing plate 58 is located on the upper side of the upper guide plate 56 and on the lower side of the second gear 54. A positioning hole is opened at the center of the fixing plate 58. The positioning hole is used for the screw 55 to pass through and to position the screw 55 so that the axis of the screw 55 coincides with the axis of the ultrasonic probe 1.

[0060] The guide frame 51 also includes: multiple guide posts 59, which are arranged around the screw 55. The upper ends of the multiple guide posts 59 pass through the upper guide plate 56 and are fixedly connected to the fixing plate 58. The lower ends of the multiple guide posts 59 pass through the lower guide plate 57 and are fixedly connected to the probe cylinder 11.

[0061] The positioning plate 7 is L-shaped. The horizontal section of the positioning plate 7 is located between the fixed plate 58 and the second gear 54. The stepper motor 52 is fixed on the vertical section of the positioning plate 7. The vertical section of the positioning plate 7 abuts against the side wall of the upright plate, thereby ensuring the accuracy of the axial movement of the screw 55.

[0062] The supply and removal system also includes a connecting plate 6, one end of which is fixedly connected to the coupling agent cylinder 42, and the other end of which is fixedly connected to the guide frame 51. The connecting plate 6 and the guide frame 51 are fixed with four M8*35 bolts. The coupling agent cylinder 42 is mounted on the connecting plate 6 with double-ended studs. Note that during installation, the end cap of the coupling agent cylinder 42 must be parallel to the connecting plate 6.

[0063] like Figure 3 and Figure 4 As shown, the lower end of the ultrasonic probe 1 is used to attach to the wall surface of the workpiece to measure the thickness of the workpiece. The probe cylinder 11 is sleeved around the ultrasonic probe 1. The measuring device also includes a radial protection mechanism 2 and an axial protection mechanism 3. The radial protection mechanism 2 is located inside the probe cylinder 11 and outside the ultrasonic probe 1. The radial protection mechanism 2 is used to fix the ultrasonic probe 1 inside the probe cylinder 11. The radial protection mechanism 2 is also used to generate radial displacement to protect the ultrasonic probe 1 when the ultrasonic probe 1 touches the workpiece and causes radial movement.

[0064] The axial protection mechanism 3 is located inside the probe cylinder 11 and on the periphery of the ultrasonic probe 1. The axial protection mechanism 3 is used to support the ultrasonic probe 1. The axial protection mechanism 3 is also used to generate axial displacement to protect the ultrasonic probe 1 when the ultrasonic probe 1 touches the workpiece and generates axial movement.

[0065] like Figure 2As shown, the radial protection mechanism 2 includes: multiple supporting elastic elements 21 and multiple arc-shaped plates 22. The multiple supporting elastic elements 21 are arranged around the inner wall of the probe cylinder 11 and near the lower end of the ultrasonic probe 1. One end of the multiple supporting elastic elements 21 is fixedly connected to the probe cylinder 11. The multiple arc-shaped plates 22 are arranged around the inner wall of the probe cylinder 11 and near the lower end of the ultrasonic probe 1. The multiple arc-shaped plates 22 are arranged corresponding to the multiple supporting elastic elements 21. The outer wall of each arc-shaped plate 22 is fixedly connected to the other end of the corresponding supporting elastic element 21. The arc-shaped openings of the multiple arc-shaped plates 22 are arranged facing the ultrasonic probe 1 and cooperate with the corresponding supporting elastic elements 21 to surround the ultrasonic probe 1, so that the ultrasonic probe 1 is suspended in the inner cavity of the probe cylinder 11.

[0066] The axial protection mechanism 3 includes a lower protection ring 31, an upper protection ring 32, and a protective elastic element 33. The lower protection ring 31 is located in the middle of the inner cavity of the probe cylinder 11, and its outer wall is fixedly connected to the probe cylinder 11. The upper protection ring 32 is located in the upper part of the inner cavity of the probe cylinder 11, and its outer wall is fixedly connected to the probe cylinder 11 and located above the lower protection ring 31. The protective elastic element 33 is sleeved on the upper end of the ultrasonic probe 1, with its two ends abutting against the upper side of the lower protection ring 31 and the lower side of the upper protection ring 32, respectively. The protective elastic element 33 is used to move upward when the ultrasonic probe 1 touches the workpiece and moves axially upward, thereby protecting the ultrasonic probe 1 and preventing it from being damaged by impact and compression. By setting the radial protection mechanism 2 and the axial protection mechanism 3, the ultrasonic probe 1 can be allowed to have multiple degrees of freedom of small displacement within a certain range, enabling the ultrasonic probe 1 to automatically align with the normal of the curved workpiece for thickness measurement.

[0067] The top of the probe cylinder 11 is closed. The axial protection mechanism 3 also includes an axial elastic element 34. The axial elastic element 34 is located in the upper part of the inner cavity of the probe cylinder 11 and is above the upper protective ring 32. One end of the axial elastic element 34 abuts against the upper side of the upper protective ring 32, and the other end of the axial elastic element 34 abuts against the top of the probe cylinder 11. The axial elastic element 34 is used to generate a downward pushing force on the protective elastic element 33 when the ultrasonic probe 1 touches the workpiece and the protective elastic element 33 moves upward axially, so that the ultrasonic probe 1 presses against the wall of the workpiece to be measured and thus measures its thickness.

[0068] During measurement, thanks to the radial protection mechanism 2, the ultrasonic probe 1 can automatically align with the surface normal and get close to the surface of the workpiece. Because the ultrasonic probe 1 is "suspended" in the inner cavity of the probe cylinder 11 by the radial protection mechanism 2, it can swing axially and radially after it is attached to the workpiece. If the moving mechanism 5 does not feed strictly along the surface normal of the workpiece, the ultrasonic probe 1 has a certain angle of automatic alignment with the surface normal.

[0069] This invention also discloses a method for measuring the thickness of large curved thin-walled alloy workpieces, comprising the following steps:

[0070] The measuring device is moved to a designated position close to the workpiece using the moving mechanism 5.

[0071] Coupling agent is sprayed onto a designated location on the workpiece to be tested through the coupling agent nozzle 41 of the supply and removal system.

[0072] Move the measuring device until the ultrasonic probe 1 is pressed against the surface of the test point on the workpiece.

[0073] The thickness of the workpiece to be measured is measured using a measuring device.

[0074] Move the measuring device back to the designated position close to the workpiece to be measured.

[0075] Compressed gas is blown out from a designated location on the workpiece through the jet pipe 43 to clean the surface of the workpiece.

[0076] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A system for measuring the thickness of large curved thin-walled alloy workpieces, characterized in that, include: A measuring device and a supply and cleaning system are provided, wherein the measuring device is attached to the wall of a workpiece to measure the thickness of the workpiece, and the supply and cleaning system is used to spray a coupling agent onto a designated location on the workpiece before measuring the workpiece thickness and to clean the designated location on the workpiece after measurement. The measuring device includes: An ultrasonic probe (1) is used to attach its lower end to the wall surface of a workpiece to measure its thickness. The probe tube (11) is fitted around the ultrasonic probe (1). The supply and removal system includes: Multiple coupling agent nozzles (41), fixed to the outer wall of the probe cylinder (11) and evenly arranged, are used to spray coupling agent at designated locations on the workpiece to be measured. The coupling cylinder (42) has its inlet connected to the external compressed gas system and its outlet connected to each coupling nozzle (41) through a pipeline. It is used to supply coupling agent to the coupling nozzle (41) under the push of compressed gas. The jet pipe (43) is fixed around the probe cylinder (11). Its inlet is connected to the external compressed gas system, and its outlet is strip-shaped and close to the designated position of the workpiece. The measuring device also includes a radial protection mechanism (2) and an axial protection mechanism (3); the radial protection mechanism (2) is located in the inner cavity of the probe cylinder (11) and on the periphery of the ultrasonic probe (1). The radial protection mechanism (2) is used to fix the ultrasonic probe (1) in the inner cavity of the probe cylinder (11). The radial protection mechanism (2) is also used to generate radial displacement to protect the ultrasonic probe (1) when the ultrasonic probe (1) touches the workpiece and generates radial movement. The axial protection mechanism (3) is located inside the probe cylinder (11) and outside the ultrasonic probe (1). The axial protection mechanism (3) is used to support the ultrasonic probe (1). The axial protection mechanism (3) is also used to generate axial displacement to protect the ultrasonic probe (1) when the ultrasonic probe (1) touches the workpiece and generates axial movement. The radial protection mechanism (2) includes: multiple supporting elastic elements (21) and multiple arc plates (22). The multiple supporting elastic elements (21) are arranged around the inner wall of the probe cylinder (11) and near the lower end of the ultrasonic probe (1). One end of the multiple supporting elastic elements (21) is fixedly connected to the probe cylinder (11). The multiple arc plates (22) are arranged around the inner wall of the probe cylinder (11) and near the lower end of the ultrasonic probe (1). The multiple arc plates (22) are arranged corresponding to the multiple supporting elastic elements (21). The outer wall of each arc plate (22) is fixedly connected to the other end of the corresponding supporting elastic element (21). The arc openings of the multiple arc plates (22) are arranged facing the ultrasonic probe (1) and cooperate with the corresponding supporting elastic elements (21) to surround the ultrasonic probe (1), so that the ultrasonic probe (1) is suspended in the inner cavity of the probe cylinder (11).

2. The system for measuring the thickness of large curved thin-walled alloy workpieces according to claim 1, characterized in that, Also includes: The moving mechanism (5) is located on the upper side of the ultrasonic probe (1) and is fixedly connected to the probe cylinder (11). It is used to drive the ultrasonic probe (1) to move radially and axially and reach the designated wall surface of the workpiece.

3. The system for measuring the thickness of large curved thin-walled alloy workpieces according to claim 2, characterized in that, The moving mechanism (5) includes: Positioning plate (7). The guide frame (51) is fixedly connected to the probe cylinder (11). A stepper motor (52) is fixed on the positioning plate (7). The first gear (53) is connected to the output shaft of the stepper motor (52) and is used to rotate under the drive of the stepper motor (52). The second gear (54) meshes with the first gear (53) and is used to rotate under the drive of the first gear (53). The screw (55) is fixedly connected at its upper end to the center of the second gear (54) and at its lower end to the guide frame (51). It is used to move axially relative to the guide frame (51) under the drive of the second gear (54), thereby driving the ultrasonic probe (1) to move axially closer to or away from the workpiece wall to be tested.

4. The system for measuring the thickness of large curved thin-walled alloy workpieces according to claim 3, characterized in that, The guide frame (51) is also connected to an industrial robot via a flange, and the industrial robot is used to drive the ultrasonic probe (1) to move radially via the guide frame (51).

5. A system for measuring the thickness of large curved thin-walled alloy workpieces according to claim 3 or 4, characterized in that, The guide frame (51) includes: Upper guide plate (56), horizontally set. The lower guide plate (57) is horizontally set and fixedly connected to the upper guide plate (56) via a vertical plate. The fixing plate (58) is located on the upper side of the upper guide plate (56) and on the lower side of the second gear (54). A positioning hole is opened at the center of the fixing plate (58). The positioning hole is used for the screw (55) to pass through and to position the screw (55) so that the axis of the screw (55) coincides with the axis of the ultrasonic probe (1).

6. A system for measuring the thickness of large curved thin-walled alloy workpieces according to claim 5, characterized in that, The guide frame (51) also includes: Multiple guide posts (59) are arranged around the screw (55), with their upper ends passing through the upper guide plate (56) and fixedly connected to the fixing plate (58), and their lower ends passing through the lower guide plate (57) and fixedly connected to the probe cylinder (11).

7. A system for measuring the thickness of large curved thin-walled alloy workpieces according to claim 6, characterized in that, The positioning plate (7) is L-shaped, with its horizontal section located between the fixed plate (58) and the second gear (54). The stepper motor (52) is fixed on the vertical section of the positioning plate (7), and the vertical section of the positioning plate (7) abuts against the side wall of the upright plate, thereby ensuring the accuracy of the axial movement of the screw (55).

8. A system for measuring the thickness of large curved thin-walled alloy workpieces according to any one of claims 1-4, characterized in that, The supply and removal system also includes: The connecting plate (6) is fixedly connected at one end to the coupling agent cylinder (42) and at the other end to the guide frame (51).

9. A system for measuring the thickness of large curved thin-walled alloy workpieces according to claim 8, characterized in that, The supply and purging system also includes: a solenoid valve (44) for supplying compressed gas from an external compressed gas system to the coupling agent cylinder (42), for supplying compressed gas from an external compressed gas system to the jet pipe (43), and for depressurizing the cylinder when the coupling agent cylinder (42) needs maintenance or coupling agent addition.

10. A method for measuring the thickness of large curved thin-walled alloy workpieces, applied to any of the systems for measuring the thickness of large curved thin-walled alloy workpieces according to claims 1-9, characterized in that, It consists of the following steps: The measuring device is moved to a designated position close to the workpiece using the moving mechanism (5). Coupling agent is sprayed onto the designated location of the workpiece to be tested through the coupling agent nozzle (41) of the supply and removal system. Move the measuring device until the ultrasonic probe (1) is pressed against the surface of the test point on the workpiece. The thickness of the workpiece to be measured is measured using a measuring device. Move the measuring device back to the designated position close to the workpiece to be measured. Compressed gas is blown out at a designated location on the workpiece through the jet pipe (43) to clean the surface of the workpiece.

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