An overlayable field-of-view device for measuring fatigue cracks at the center of a sheet metal plate.

Abstract

The present invention relates to an overlapping field of view device for measuring fatigue cracks in the center of a plate, comprising a left field of view component and a right field of view component; a lateral reciprocating drive mechanism is perpendicular to the driving direction of a longitudinal reciprocating drive mechanism; the lateral reciprocating drive mechanism drives the angle adjustment mechanism to move back and forth in the lateral direction, the longitudinal reciprocating drive mechanism is arranged on the angle adjustment mechanism, the angle adjustment mechanism can adjust the horizontal angle of the longitudinal reciprocating drive mechanism, a camera is arranged on the longitudinal reciprocating drive mechanism, and the longitudinal reciprocating drive mechanism drives the camera to move back and forth in the longitudinal direction. The present invention cleverly connects an oblique square prism with a lens, and the installation position of a camera on one side is higher than that of a camera on the other side. When the cameras are close to each other, one side prism is located above the other side prism, so that the left and right camera fields of view overlap in the horizontal direction, and the collision of the lenses during movement is effectively avoided.

Description

Technical Field

[0001] The invention relates to the technical field of fatigue performance detection of metal materials, and in particular to an overlapping field of view device for measuring fatigue cracks in the center of a plate. Background Art

[0002] Fatigue fracture of metal materials is one of the main ways of failure of aviation materials. In the history of modern aviation, there are countless air crashes caused by fatigue fracture failure of materials. Therefore, in the field of aircraft engine design and manufacturing, special attention is paid to the fatigue fracture performance of materials. As key components of the engine, turbine disks, impellers and blades need to withstand high temperatures, multi-axial stress-strain states, corrosive environments and long life expectancy. However, no matter what kind of metal material, it is inevitable that internal defects will be introduced during the smelting preparation, processing and forming, and corrosion service. The existence of such defects will cause fatigue cracks in the components during long-term service, and as the cracks continue to expand, they will eventually lead to component failure. In the development of engine materials, the growth rate and threshold value of fatigue cracks are key mechanical performance indicators, and the size of this value directly affects the service life of engine materials. Therefore, the accurate measurement of crack extension size is a very critical technical task and has extremely important engineering application value.

[0003] At present, fatigue crack measurement methods are mainly divided into two categories: one is direct measurement method, such as ordinary reading method, in-situ measurement method, strain gauge method; the other is indirect measurement method, which uses other physical signals to measure crack length, such as acoustic emission method, equivalent potential method, etc. Among them, the ordinary reading method is widely used due to its high measurement accuracy and convenient operation. However, for fatigue cracks in the center of the plate, the crack will extend to both sides along the central opening. If a single microscope is used, it is necessary to constantly adjust the position of the microscope to measure the crack size at both ends respectively. This method is inefficient, cumbersome to operate, and prone to errors. If two microscopes are installed on the track, the cracks at both ends can be measured simultaneously. However, in the initial stage of the crack, the shorter crack makes it impossible for the two optical microscopes to observe the center part at the same time, resulting in interference between the two microscopes occupying the same track, which in turn affects the test efficiency.

[0004] Patents CN 209606222U and CN 113252480A disclose a common reading method for real-time monitoring of the crack size on the front and rear surfaces of a specimen, but both are only applicable to the observation of crack extension with a single microscope on the same side. In addition, patents CN 114998717A and CN114486510A disclose a digital image processing technology identification method for crack characteristics, which can realize dynamic real-time monitoring of cracks. Although it avoids the mutual interference between two microscopes on the same side, the data collection volume is large and the cost is high. Summary of the invention

[0005] The purpose of the present invention is: in view of this, the present invention provides an overlapping field of view device for measuring fatigue cracks in the center of a plate, which adopts a symmetrical arrangement of left and right industrial cameras and a unique optical path design of an oblique square prism, so that the left and right cameras can achieve overlapping fields of view when they are close to each other, thereby efficiently measuring the initial crack sizes on both sides.

[0006] The technical solution of the present invention is:

[0007] Provided is an overlapping field of view device for measuring fatigue cracks in the center of a plate, comprising a left field of view component and a right field of view component;

[0008] The left field of view assembly and the right field of view assembly both include a transverse reciprocating drive mechanism, an angle adjustment mechanism 5, a longitudinal reciprocating drive mechanism, a camera 9, a lens 10 and an rhombus prism 11; the transverse reciprocating drive mechanism is perpendicular to the driving direction of the longitudinal reciprocating drive mechanism; the transverse reciprocating drive mechanism drives the angle adjustment mechanism 5 to move transversely, the longitudinal reciprocating drive mechanism is arranged on the angle adjustment mechanism 5, the angle adjustment mechanism can adjust the horizontal angle of the longitudinal reciprocating drive mechanism, the camera 9 is arranged on the longitudinal reciprocating drive mechanism, the longitudinal reciprocating drive mechanism drives the camera to move longitudinally, the lens is installed on the camera, the rhombus prism 11 is installed on the front side of the lens, the rhombus prism is arranged in parallel with the transverse reciprocating drive mechanism, and the rhombus prism forms a Z-shaped refraction light path;

[0009] The camera in the left field of view assembly and the camera in the right field of view assembly have a height difference in the vertical direction, so that the rhombic prism in the left field of view assembly and the rhombic prism in the right field of view assembly will not interfere with each other in motion;

[0010] When the transverse reciprocating driving mechanism in the left field of view assembly and the transverse reciprocating driving mechanism in the right field of view assembly are driven toward each other to the extreme position, the projections of the rhombus prism in the left field of view assembly and the rhombus prism in the right field of view assembly in the vertical direction overlap.

[0011] Furthermore, the transverse reciprocating drive mechanism includes a transverse servo motor 1, a coupling 2, a transverse screw 3 and a transverse screw slide 4; the angle adjustment mechanism is installed on the transverse screw slide 4. Furthermore, one end of the transverse servo motor 1 is provided with a coupling 2, and the other end of the coupling 2 is provided with a transverse screw 3, and the transverse screw 3 passes through the transverse screw slide 4 to form a threaded fit.

[0012] Furthermore, the longitudinal reciprocating drive mechanism includes a longitudinal stepping motor 6 , a longitudinal lead screw slide 7 and a longitudinal lead screw 8 ; the camera is mounted on the longitudinal lead screw slide 7 .

[0013] Furthermore, the angle adjustment mechanism includes a U-shaped elastic block and a screw; the screw passes through the open end of the U-shaped elastic block 51, and the screw is threadedly matched with the upper and lower plates at the open end. The forward and reverse rotation of the screw can make the upper and lower plates swing toward or away from each other, thereby changing the opening of the open end, resulting in a change in the pitch angle of the longitudinal reciprocating drive mechanism. Furthermore, the threads at both ends of the screw are respectively positive threads 53 and negative threads 55, which respectively match the positive thread screw hole 52 of the upper plate and the negative thread screw hole of the lower plate. Furthermore, an adjustment wheel is provided in the middle of the screw, and the adjustment wheel rotates integrally with the screw.

[0014] Furthermore, both ends of the transverse screw and the longitudinal screw form limit positions.

[0015] Furthermore, the two ends of the screw of the angle adjustment mechanism form axial limiters to ensure a certain range of opening width of the U-shaped elastic block, so that the industrial camera can be slightly displaced in the upper and lower axial directions.

[0016] Furthermore, the cross section of the rhombus prism is a parallelogram, which can translate the light for a certain distance and keep the incident light parallel to the outgoing light.

[0017] Furthermore, the rhombic prisms in the left field of view assembly and the right field of view assembly both form a certain angle with the horizontal line, and the rhombic prisms in the left field of view assembly and the right field of view assembly both extend toward each other. When the two rhombic prisms are both located at the opposite extreme positions, the prism on one side is located above the prism on the other side, so that the fields of view of the cameras on both sides overlap in the horizontal direction.

[0018] Furthermore, the installation position of the camera on one side is higher than that of the camera on the other side, and the cameras on both sides are tilted toward the horizontal line at the same time to form a pitch angle.

[0019] The advantages of the present invention are as follows: (1) The present invention skillfully connects the rhombus prism to the lens, and the installation position of the camera on one side is higher than that of the camera on the other side. When the cameras are close to each other, the prism on one side is located above the prism on the other side, so that the field of view of the left and right cameras overlaps in the horizontal direction, effectively avoiding collision of the lenses during movement.

[0020] (2) In order to fine-tune the pitch angle of the camera, the present invention designs a pitch angle adjustment mechanism. The pitch fine-tuning screw is turned to adjust the width of the opening of the U-shaped elastic block, so that the angle between the upper and lower surfaces of the U-shaped elastic block changes, thereby changing the pitch angle of the camera.

[0021] (3) A servo motor-driven lead screw slide is used to achieve lateral movement of the camera when measuring crack size. Different from the traditional sliding guide rail, the present invention is more convenient to operate and more efficient. At the same time, the lead screw design makes the camera more stable during mobile measurement and the measurement data more accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of the present invention;

[0023] Figure 2 It is a front view of the overlapping field of view device;

[0024] Figure 3 is a side view of the angle adjustment mechanism;

[0025] Figure 4 is a side view of the camera assembly;

[0026] Figure 5 Schematic diagram of light translation;

[0027] Among them: 1. lateral servo motor, 2. coupling, 3. lateral screw, 4. lateral screw slide, 5. angle adjustment mechanism, 6. longitudinal stepping motor, 7. longitudinal screw slide, 8. longitudinal screw, 9. camera, 10. lens, 11. rhombus prism, 51. U-shaped elastic block, 52. positive thread screw hole, 53. positive thread, 54. rotating wheel, 55. negative thread, 56. negative thread screw hole. DETAILED DESCRIPTION

[0028] The disclosed examples will be more fully described with reference to the accompanying drawings, in which some (but not all) of the disclosed examples are shown. In fact, many different examples may be described and these examples should not be construed as limited to the examples set forth herein. Instead, these examples are described so that the present invention will be thorough and complete and will fully convey the scope of the present invention to those skilled in the art.

[0029] Provided is an overlapping field of view device for measuring fatigue cracks in the center of a plate, comprising a left field of view component and a right field of view component;

[0030] The left field of view assembly and the right field of view assembly both include a transverse reciprocating drive mechanism, an angle adjustment mechanism 5, a longitudinal reciprocating drive mechanism, a camera 9, a lens 10 and an rhombus prism 11; the transverse reciprocating drive mechanism is perpendicular to the driving direction of the longitudinal reciprocating drive mechanism; the transverse reciprocating drive mechanism drives the angle adjustment mechanism 5 to move transversely, the longitudinal reciprocating drive mechanism is arranged on the angle adjustment mechanism 5, the angle adjustment mechanism can adjust the horizontal angle of the longitudinal reciprocating drive mechanism, the camera 9 is arranged on the longitudinal reciprocating drive mechanism, the longitudinal reciprocating drive mechanism drives the camera to move longitudinally, the lens is installed on the camera, the rhombus prism 11 is installed on the front side of the lens, the rhombus prism is arranged in parallel with the transverse reciprocating drive mechanism, and the rhombus prism forms a Z-shaped refraction light path;

[0031] The camera in the left field of view assembly and the camera in the right field of view assembly have a height difference in the vertical direction, so that the rhombic prism in the left field of view assembly and the rhombic prism in the right field of view assembly will not interfere with each other in motion;

[0032] When the transverse reciprocating driving mechanism in the left field of view assembly and the transverse reciprocating driving mechanism in the right field of view assembly are driven toward each other to the extreme position, the projections of the rhombus prism in the left field of view assembly and the rhombus prism in the right field of view assembly in the vertical direction overlap.

[0033] The transverse reciprocating drive mechanism includes a transverse servo motor 1, a coupling 2, a transverse screw 3 and a transverse screw slide 4; the angle adjustment mechanism is installed on the transverse screw slide 4. Furthermore, one end of the transverse servo motor 1 is provided with a coupling 2, and the other end of the coupling 2 is provided with a transverse screw 3, and the transverse screw 3 passes through the transverse screw slide 4 to form a threaded fit.

[0034] The longitudinal reciprocating drive mechanism comprises a longitudinal stepping motor 6 , a longitudinal lead screw slide 7 and a longitudinal lead screw 8 ; the camera is mounted on the longitudinal lead screw slide 7 .

[0035] The angle adjustment mechanism includes a U-shaped elastic block and a screw; the screw passes through the open end of the U-shaped elastic block 51, and the screw is threadedly matched with the upper and lower plates at the open end. The forward and reverse rotation of the screw can make the upper and lower plates swing toward or away from each other, thereby changing the opening of the open end, resulting in a change in the pitch angle of the longitudinal reciprocating drive mechanism. Furthermore, the threads at both ends of the screw are respectively positive threads 53 and negative threads 55, which respectively match the positive thread screw hole 52 of the upper plate and the negative thread screw hole of the lower plate. Furthermore, an adjustment wheel is provided in the middle of the screw, and the adjustment wheel rotates integrally with the screw.

[0036] Both ends of the transverse lead screw and the longitudinal lead screw form limited positions.

[0037] The two ends of the screw of the angle adjustment mechanism form axial limiters to ensure a certain range of opening width of the U-shaped elastic block, so that the industrial camera can be slightly displaced in the upward and downward axial directions.

[0038] The cross section of the rhombus prism is a parallelogram, which can translate the light for a certain distance and keep the incident light parallel to the outgoing light.

[0039] The rhombic prisms in the left field of view assembly and the right field of view assembly both form a certain angle with the horizontal line, and the rhombic prisms in the left field of view assembly and the right field of view assembly both extend toward each other. When the two rhombic prisms are both located at the opposite extreme positions, one side prism is located above the other side prism, so that the fields of view of the cameras on both sides overlap in the horizontal direction.

[0040] The installation position of the camera on one side is higher than that of the camera on the other side, and the cameras on both sides are tilted toward the horizontal line at the same time to form a pitch angle.

[0041] The description of different advantageous arrangements has been presented for purposes of illustration and description, but the description is not intended to be exclusive or limited to examples of the disclosed form. Many modifications and variations will be apparent to those of ordinary skill in the art. In addition, different advantageous examples may describe different advantages compared to other advantageous examples. The selected example or examples are selected and described in order to best illustrate the principles of the examples, practical applications, and to enable those of ordinary skill in the art to understand that the invention is provided with various examples with various modifications suitable for the particular use contemplated.

Claims

1. An overlapping field of view device for measuring fatigue cracks in the center of a plate, characterized in that: Includes a left field of view component and a right field of view component; The left field of view assembly and the right field of view assembly both comprise a transverse reciprocating drive mechanism, an angle adjustment mechanism (5), a longitudinal reciprocating drive mechanism, a camera (9), a lens (10) and an rhombus prism (11); the transverse reciprocating drive mechanism is perpendicular to the driving direction of the longitudinal reciprocating drive mechanism; the transverse reciprocating drive mechanism drives the angle adjustment mechanism (5) to move transversely and reciprocally, the longitudinal reciprocating drive mechanism is arranged on the angle adjustment mechanism (5), the angle adjustment mechanism can adjust the horizontal angle of the longitudinal reciprocating drive mechanism, the camera (9) is arranged on the longitudinal reciprocating drive mechanism, the longitudinal reciprocating drive mechanism drives the camera to move longitudinally and reciprocally, the lens is mounted on the camera, the rhombus prism (11) is mounted on the front side of the lens, the rhombus prism is arranged in parallel with the transverse reciprocating drive mechanism, and the rhombus prism forms a Z-shaped refractive light path; The camera in the left field of view assembly and the camera in the right field of view assembly have a height difference in the vertical direction, so that the rhombic prism in the left field of view assembly and the rhombic prism in the right field of view assembly will not interfere with each other in motion; When the transverse reciprocating driving mechanism in the left field of view assembly and the transverse reciprocating driving mechanism in the right field of view assembly are driven toward each other to the extreme position, the projections of the rhombus prism in the left field of view assembly and the rhombus prism in the right field of view assembly in the vertical direction overlap.

2. The overlapping field of view device for measuring fatigue cracks in the center of a plate according to claim 1, characterized in that: The transverse reciprocating drive mechanism comprises a transverse servo motor (1), a coupling (2), a transverse lead screw (3) and a transverse lead screw slide (4); the angle adjustment mechanism is mounted on the transverse lead screw slide (4).

3. The overlapping field of view device for measuring fatigue cracks in the center of a plate according to claim 2, characterized in that: A coupling (2) is provided at one end of the transverse servo motor (1), and a transverse lead screw (3) is provided at the other end of the coupling (2). The transverse lead screw (3) passes through a transverse lead screw slide (4) to form a threaded fit.

4. The overlapping field of view device for measuring fatigue cracks in the center of a plate according to claim 3, characterized in that: The longitudinal reciprocating drive mechanism comprises a longitudinal stepping motor (6), a longitudinal lead screw slide (7) and a longitudinal lead screw (8); the camera is mounted on the longitudinal lead screw slide (7).

5. The overlapping field of view device for measuring fatigue cracks in the center of a plate according to claim 4, characterized in that: The angle adjustment mechanism includes a U-shaped elastic block and a screw; the screw passes through the open end of the U-shaped elastic block, and the screw is threadedly matched with the upper and lower plates at the open end. The forward and reverse rotation of the screw can make the upper and lower plates swing towards or away from each other, thereby changing the opening of the open end, resulting in a change in the pitch angle of the longitudinal reciprocating drive mechanism.

6. The overlapping field of view device for measuring fatigue cracks in the center of a plate according to claim 5, characterized in that: The threads at both ends of the screw are respectively positive and negative, which are matched with the positive screw hole of the upper plate and the negative screw hole of the lower plate respectively. An adjusting wheel is arranged in the middle of the screw, and the adjusting wheel rotates integrally with the screw.

7. The overlapping field of view device for measuring fatigue cracks in the center of a plate according to claim 5, characterized in that: Both ends of the transverse lead screw and the longitudinal lead screw form limited positions.

8. The overlapping field of view device for measuring fatigue cracks in the center of a plate according to claim 5, characterized in that: Both ends of the screw of the angle adjustment mechanism form axial limits.

9. The overlapping field of view device for measuring fatigue cracks in the center of a plate according to claim 1, characterized in that: The cross section of the rhombus prism is a parallelogram, which can translate the light for a certain distance and keep the incident light parallel to the outgoing light.

10. The overlapping field of view device for measuring fatigue cracks in the center of a plate according to claim 1, characterized in that: The rhombic prisms in the left field of view assembly and the right field of view assembly both form a certain angle with the horizontal line, and the rhombic prisms in the left field of view assembly and the right field of view assembly both extend toward each other. When the two rhombic prisms are both located at the opposite extreme positions, one side of the prism is located above the other side of the prism, so that the fields of view of the cameras on both sides overlap in the horizontal direction.

Images