CN102661893A - Camera mounting and regulating mechanism for fatigue crack propagation experiment - Google Patents

Abstract

A fatigue crack growth test camera installation and adjustment mechanism, including a camera light source installation mechanism, a height position adjustment mechanism and a connection mechanism, the main body of the camera light source installation mechanism is a PVC plastic steel door and window profile, and the camera and light source components are installed on the camera light source installation mechanism The height position adjustment mechanism is composed of a horizontal connecting frame and a vertical connecting plate. One end of the camera light source installation mechanism is connected with the horizontal connecting frame. The horizontal connecting frame is slidably installed in the chute guide rail of the vertical connecting plate, and the vertical connecting plate slides Positioning screw holes are processed in the groove guide rail, the vertical connecting plate is connected with one end of the connecting mechanism, and the other end of the connecting mechanism is connected with the camera motion driving mechanism. The invention provides a fatigue crack growth test camera installation and adjustment mechanism with simplified structure, good stability, reduced cost and high installation precision.

Description

Fatigue crack growth test camera installation and adjustment mechanism

technical field

The invention relates to a camera installation mechanism, in particular to designing a camera installation adjustment mechanism used in metal material fatigue crack growth tests.

Background technique

Fatigue crack growth test is a test method to study the fatigue fracture characteristics of metal materials by measuring the length of fatigue cracks produced by the specimen under the action of set alternating load in real time. At present, the main form of fatigue crack growth test is the international standard Specified C(T) compact tension test and three-point bending crack growth test with a pre-crack, in which case the fatigue cracks extend substantially linearly in the direction of the pre-crack under a set alternating load. The core content of the fatigue crack growth test is to accurately measure the fatigue crack length at each moment under the action of the set test load, so as to obtain the change law of the fatigue crack length of the measured material with time, the fatigue crack growth rate, and the fatigue crack growth. Life and other material fracture mechanics data.

The initiation and propagation of fatigue cracks is a complex and slow nonlinear evolution process. The traditional microscope detection is often done manually or most of the links require manual participation. Not only is the work efficiency low, but it is also easily affected by the subjective factors of the inspectors. The efficiency and accuracy of detection cannot be guaranteed, and the requirements of the test can no longer be met. The online crack detection method using machine vision technology can complete crack detection and further analysis and processing intuitively, accurately and in real time.

The machine vision crack detection method uses a camera as a real-time detection mechanism for fatigue cracks. In order to ensure the accuracy of crack test piece image acquisition and crack length calculation and improve the accuracy of crack measurement, there are strict requirements on the position of the camera. It is necessary to ensure that the center line of the camera is Strictly perpendicular to the surface of the crack test piece. In addition, in order to meet the test requirements, there are also strict installation requirements for the light source.

Contents of the invention

In order to overcome the shortcomings of the camera adjustment mechanism in the existing machine vision crack detection method, the mechanism is huge, the stability is reduced, and the cost is increased. The present invention provides a fatigue crack growth test with simplified structure, good stability, reduced cost, and high installation accuracy. Camera installation adjustment mechanism.

The technical solution adopted by the present invention to solve its technical problems is:

A fatigue crack growth test camera installation and adjustment mechanism, including a camera light source installation mechanism, a height position adjustment mechanism and a connection mechanism, the main body of the camera light source installation mechanism is a PVC plastic steel door and window profile, and the camera and light source components are installed on the camera light source installation mechanism The height position adjustment mechanism is composed of a horizontal connecting frame and a vertical connecting plate. One end of the camera light source installation mechanism is connected with the horizontal connecting frame. The horizontal connecting frame is slidably installed in the chute guide rail of the vertical connecting plate, and the vertical connecting plate slides Positioning screw holes are processed in the groove guide rail, the vertical connecting plate is connected with one end of the connecting mechanism, and the other end of the connecting mechanism is connected with the camera motion driving mechanism. The invention provides a fatigue crack growth test camera installation and adjustment mechanism with simplified structure, good stability, reduced cost and high installation precision.

Further, the camera light source is a ring light source, the ring light source is set on the lens of the camera and fixed on the light source support frame through positioning screws, and the other end of the light source support frame is connected with the PVC plastic steel door and window profile through plastic screws

Furthermore, the model of the PVC plastic-steel door and window profile is determined according to the size of the selected camera and lens, and the camera installation positioning groove is processed on the PVC plastic-steel door and window profile according to the size of the CCD camera and lens, and several cameras and lenses are installed. Fixing clip for light source connection wire.

Furthermore, the vertical connecting plate is a chute guide rail mechanism, and the chute guide rail is processed with several rows of positioning bolt holes along the length direction, and the first row or two rows of positioning bolt holes are semi-through holes for connecting with one end of the T-shaped connection mechanism. The other positioning bolt holes are all through holes for connecting with the horizontal connecting frame.

The horizontal connecting frame includes a base and a cover plate. The base includes an installation connection end for installing the camera light source installation mechanism and a connection positioning slide plate connected with the vertical connection plate. The installation connection end and the connection positioning slide plate can be connected by welding, or can be made into Integral structure, the main body of the installation and connection end is a guide groove mechanism, the camera and light source line lead-out holes and several connection positioning bolt holes are processed on the groove wall to connect with the cover plate, and one row or two rows of connection positioning bolts are processed on the connection positioning slide plate The hole is used to connect with the vertical connecting plate, insert the connecting positioning slide plate in the chute guide rail on the vertical connecting plate, adjust the height position and fix it with the vertical connecting plate through the positioning bolt.

The PVC plastic-steel door and window profile connecting rod of the camera light source installation mechanism is inserted into the guide groove of the base of the horizontal connecting frame, and the cover plate is covered to compress it and then fixed by the positioning bolt and the base.

The connecting mechanism is a T-shaped or right-angled connecting plate, which is composed of two parts, a horizontal connecting end and a vertical connecting end. Both ends of the connecting plate are processed with positioning bolt holes, and the vertical connecting end of the connecting plate is connected with the vertical connecting plate. The horizontal connecting end of the connecting plate is inserted in the guide groove of the camera movement driving mechanism.

For the T-shaped or right-angled connecting plate, the positioning bolt holes at the horizontal connecting end and the vertical connecting end of the connecting plate are arranged symmetrically. When installing, the vertical connecting end of the connecting mechanism can be up or down, so as to adapt to fatigue testing machines with different frame heights.

The technical idea of the present invention is: the fatigue crack growth test can be carried out on various types of high-frequency and low-frequency fatigue testing machines. In order to match various models, the camera should be able to adjust the amplitude in the height direction. It is composed of a motion drive mechanism and a camera installation mechanism. The precise adjustment of the camera position in a small range is realized by the drive mechanism driven by a stepping motor, and the large-scale position adjustment, especially the position adjustment in the height direction, is realized by stepping motor control. It will cause problems such as huge mechanism, reduced stability, and increased cost. The present invention realizes this by designing an exquisite installation mechanism

In order to ensure the clear and stable image collection, the camera installation frame and the camera must be insulated. If it is a large-scale professional production, it should be injection molded with plastic materials, but it requires specialized equipment and molds, and the cost is very high. Another way is to use metal materials to add insulating materials between the camera and the metal support frame, but this way has a complex structure and poor insulation. The present invention uses PVC plastic steel door and window profiles as the camera mounting bracket after simple processing, which is simple and insulated. Good performance, low cost, and high precision of camera position installation.

The beneficial effects of the invention are mainly manifested in: simplified structure, good stability and reduced cost.

Description of drawings

Fig. 1 is a schematic diagram of the overall structure of the installation and adjustment mechanism of the fatigue crack growth test camera of the present invention, wherein (a) is a front view of the structure, and (b) is a top view of the structure.

Fig. 2 is a schematic diagram of the connecting rod structure of PVC plastic-steel door and window profiles of the present invention, wherein (a) is a front view of the structure, (c) is a top view of the structure, and (b) is a cross-sectional view of PVC plastic-steel door and window profiles.

Fig. 3 is a schematic diagram of the structure of the light source bracket of the present invention, wherein (a) is a front view of the structure, (c) is a top view of the structure, and (b) is a cross-sectional view of the structure along the direction A.

Fig. 4 is a schematic diagram of the connection of the camera light source assembly of the present invention.

Fig. 5 is a schematic diagram of the structure and connection of the vertical connecting plate and the T-shaped connecting plate of the present invention, wherein (b) is a left view of the structure, (a) is a cross-sectional view of the structure in the direction of B, and (c) is a view of the structure in the direction of C.

Fig. 6 is a schematic structural view of the base of the horizontal connecting frame of the present invention, wherein (a) is a front view of the structure, (b) is a structural view in the direction of A, and (c) is a top view of the structure.

Fig. 7 is a schematic structural view of the cover plate of the horizontal connecting frame of the present invention, wherein (a) is a front view of the structure, (b) is a cross-sectional view along the direction A, and (c) is a top view of the structure.

Fig. 8 is a schematic diagram of the connection between the vertical connecting plate and the horizontal connecting plate base of the present invention, wherein a) is a front view of the structure, (b) is a structural view in the direction of B, and (c) is a top view of the structure.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings.

Referring to Figures 1 to 8, a fatigue crack growth test camera installation and adjustment mechanism, (a) is a front view of the structure, (b) is a top view of the structure, as shown in the figure, the overall structure of the camera installation and adjustment mechanism consists of a camera light source installation mechanism 1, The height position adjustment mechanism 2 and 3 and the connection mechanism 4 are composed. The main body of the camera light source installation mechanism 1 is a certain PVC plastic-steel door and window profile 11. The PVC plastic-steel door and window profile is simply processed, and the camera 12 is installed and positioned. Through the light source support frame 14 and Set screw is installed ring light source 15, and 13 is the lens that matches with camera. The height position adjustment mechanism is composed of a horizontal connecting frame 2 and a vertical connecting plate 3. One end of the camera light source installation mechanism 1 is connected with the horizontal connecting frame 2. The horizontal connecting frame 2 can move in the chute guide rail of the vertical connecting plate 3 to adjust its position and position After being fixed by screws, the vertical connecting plate 3 is connected to one end of the connecting mechanism 4, and the other end of the connecting mechanism 4 is inserted in the guide groove of the camera motion drive mechanism, and positioned by bolts.

Fig. 2 is a schematic diagram of the connecting rod structure of PVC plastic-steel door and window profiles of the present invention, (a) is a front view of the structure, (c) is a top view of the structure, and (b) is a cross-sectional view of PVC plastic-steel door and window profiles. According to the size of the camera and lens, select the PVC plastic-steel door and window profile 11 of a suitable model as shown in Figure 2b in section shape, and process the camera positioning groove 111 according to the size of the CCD camera on the PVC plastic-steel door and window profile 11, and 112 is the bottom surface of the camera positioning groove. 113 is the fixing clip for the camera and the light source connecting wire.

Figure 3: Schematic diagram of the structure of the light source bracket 14 of the present invention, (a) is a front view of the structure, (c) is a top view of the structure, (b) is a cross-sectional view of the structure in the A direction, the light source selected in this patent is a ring light source, and 141 is a light source bracket The connection end with the ring light source is processed with a central circular hole 1412 allowing the lens to pass through and a screw hole 1411 for connecting and positioning the light source. The size of the central circular hole 1412 matches the selected lens, and the screw hole 1411 for connecting the light source to the selected ring light source Size matches. 142 is the connecting end of the light source bracket and the camera and the PVC plastic-steel door and window profiles, and the screw hole 1421 of the location should match the selected camera.

Fig. 4 is the connection schematic diagram of camera light source assembly of the present invention, and camera 12 and matching lens 13 are connected to form camera assembly by standard interface, and camera assembly is put into the camera positioning groove 111 of plastic-steel door and window profile connecting rod 11 as shown in Figure 2, circular The light source 15 and the connecting end 141 of the light source bracket 14 are fixedly connected by positioning screws 1411 to form a light source assembly, and the formed light source assembly is set on the lens through the central hole 1412, and the connecting end 142 of the light source bracket passes through four plastic positioning screws 1421 through PVC plastic steel doors and windows The positioning surface of the profile is connected to the camera.

Figure 5: It is a schematic diagram of the structure and connection of the vertical connecting plate 3 and the T-shaped connecting plate 4 of the present invention, (b) is a left view of the structure, (a) is a cross-sectional view of the structure in the direction of B, (c) is a view of the structure in the direction of C, T-shaped The connecting plate 4 is composed of a horizontal connecting end 41 and a vertical connecting end 42. Several positioning screw holes 411 are processed on the horizontal connecting end 41. The horizontal connecting end 41 of the T-shaped connecting plate is inserted into the guide groove of the camera movement driving mechanism workbench and passed through the bolts. Fixed positioning, one row or two rows of positioning screw holes are processed on the vertical connecting end 42 of the T-shaped connecting plate 4 and the vertical connecting plate 3 is connected and positioned by bolts 421. When installing, the vertical connecting end 42 of the connecting mechanism 4 can be upward or downward , to adapt to fatigue testing machines with different rack heights. The vertical connecting plate 3 is processed with a guiding and positioning chute 31, positioning screw holes 32 and 33, and the positioning screw holes 32 are one row or two rows for connecting with the T-shaped connecting plate 4, which are semi-through holes and positioning screw holes 33 It is several rows, used to be connected with the horizontal connecting frame 2, and is a through hole.

The horizontal connecting frame 2 includes a base 21 as shown in Figure 6, (a) is a structural front view, (b) is a structural view in the direction of A, (c) is a structural top view; the cover plate 22 is as shown in Figure 7, (a) is The front view of the structure, (b) is the cross-sectional view along A direction, and (c) is the top view of the structure. The base 21 includes an installation connecting end 212 and a connecting and positioning slide plate 211 for installing the camera light source installation mechanism. The installing connecting end 212 and the connecting and positioning sliding plate 211 can be connected by welding, and of course it can also be made into an integral structure. The camera and light source line lead-out hole 2121 and several connection positioning bolt holes 2122 are used to be connected with the cover plate 22 , and one or two rows of connection positioning bolt holes 2111 are processed on the connection positioning slide plate 211 to be connected to the vertical connection plate 3 .

The cover plate 22 is designed in order to fix the PVC plastic-steel door and window profile connecting rod inserted in the base chute, and is fixed by the set bolt and the base. Figure 8 is a schematic diagram of the connection between the vertical connecting plate and the base of the horizontal connecting plate, (a) is the front view of the structure, (b) is the structural view in the B direction, (c) is the top view of the structure, and the connecting positioning slide plate 211 of the horizontal connecting frame 2 is inserted in the vertical In the chute guide rail 31 on the connecting plate 3, after adjusting the height position, it is fixed by the positioning bolt 2112 and the vertical connecting plate 3.

The overall structure of the camera installation and adjustment mechanism is composed of a camera light source installation mechanism 1, height position adjustment mechanisms 2 and 3, and a connecting mechanism 4. The main body of the camera light source installation mechanism 1 is a PVC plastic steel door and window profile 11, which is simply processed. , install and position the camera head 12, and install the ring light source 15 through the light source support frame 14 and positioning screws. The height position adjustment mechanism is composed of a horizontal connecting frame 2 and a vertical connecting plate 3. One end of the camera light source installation mechanism 1 is connected with the horizontal connecting frame 2. The horizontal connecting frame 2 can move in the chute guide rail of the vertical connecting plate 3 to adjust its position and position After being fixed by screws, the vertical connecting plate 3 is connected to one end of the connecting mechanism 4, and the other end of the connecting mechanism 4 is inserted in the guide groove of the camera motion drive mechanism, and positioned by bolts.

The invention adopts PVC plastic-steel door and window profiles to be used as the camera mounting bracket after simple processing, which is simple, good in insulation, low in cost, and has high camera position installation accuracy.

Claims (8)

1. fatigue crack propagation test camera installing and adjusting mechanism; It is characterized in that: said camera installing and adjusting mechanism comprises camera light source installing mechanism, height and position adjusting mechanism and bindiny mechanism; The main body of camera light source installing mechanism is the PVC plastics-steel shapes for door and window; Camera and light source assembly are installed on the said camera light source installing mechanism, and the height and position adjusting mechanism is made up of with vertical web joint horizontal link, and an end of camera light source installing mechanism links to each other with horizontal link; Horizontal link is slidably mounted in the chute guide rail of vertical web joint; Be processed with the connection positioning screw hole in the chute guide rail of said vertical web joint, vertical web joint links to each other with bindiny mechanism one end, and the other end of bindiny mechanism is connected with the cam movement driving mechanism.

2. fatigue crack propagation test camera installing and adjusting mechanism as claimed in claim 1; It is characterized in that: said camera light source is an annular light source; Annular light source is enclosed within on the camera lens of camera and through dog screw annular light source is fixed on the light source bracing frame, and the other end of light source bracing frame is connected with the PVC plastics-steel shapes for door and window through plastic screw.

3. according to claim 1 or claim 2 fatigue crack propagation test camera installing and adjusting mechanism; It is characterized in that: the dimensioned according to CCD camera and camera lens on the PVC plastics-steel shapes for door and window goes out the camera mounting positioning groove, and several cameras and light source connecting line geometrical clamp are installed.

4. according to claim 1 or claim 2 fatigue crack propagation test camera installing and adjusting mechanism; It is characterized in that: said vertical web joint is the chute guide rail mechanism; The chute guide rail is processed with several registration bolts hole along its length; Last row of positioning bolt hole or two rows are that half through hole is used for linking to each other with T type bindiny mechanism one end, and other positioning bolt hole is through hole and is used for linking to each other with horizontal link.

5. according to claim 1 or claim 2 fatigue crack propagation test camera installing and adjusting mechanism; It is characterized in that: said horizontal link comprises base and cover plate; Base comprises to be installed link and is connected the location slide plate, link is installed and is connected location slide plate connection, and it is guide groove mechanism that the link main body is installed; Being processed with camera on the cell wall is connected positioning bolt hole with light source line fairlead and is used for linking to each other with cover plate with several; Connect and to be processed with a row on the slide plate of location or two row's bolts hole are used for linking to each other with vertical web joint, slide plate is located in connection be inserted in the chute guide rail on the vertical web joint, fix with vertical web joint through bolt after adjusting height and position.

6. according to claim 1 or claim 2 fatigue crack propagation test camera installing and adjusting mechanism; It is characterized in that: the PVC plastics-steel shapes for door and window connecting link of said camera light source installing mechanism is inserted into horizontal link base and installs in the guide groove of link, covers through bolt cover plate and base to be fixed after cover plate compresses it.

7. according to claim 1 or claim 2 fatigue crack propagation test camera installing and adjusting mechanism; It is characterized in that: said bindiny mechanism is the web joint of T type or perpendicular type; Form with vertical link two parts by horizontal link; The two ends of web joint all are processed with positioning bolt hole, and the vertical link of web joint links to each other with vertical web joint, and the horizontal link of web joint is inserted in the gathering sill of cam movement driving mechanism and links to each other with driving mechanism.

8. fatigue crack propagation test camera installing and adjusting mechanism as claimed in claim 7 is characterized in that: the web joint of said T type or perpendicular type, the positioning bolt hole of horizontal link of web joint and vertical link is symmetric offset spread.

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