Workpiece crack detection device for machining

Abstract

The invention discloses a workpiece crack detection device for machining, and relates to the technical field of workpiece crack detection, the workpiece crack detection device further comprises two groups of turnover assemblies corresponding to two portal frames respectively, each turnover assembly comprises two turnover groups which are located on two positioning frames respectively and are symmetrically arranged, and clamping assemblies are arranged on the turnover groups. The two sets of overturning assemblies drive the clamping assemblies to swing in the opposite directions correspondingly. Traditional detection equipment can realize full-surface coverage detection of a workpiece only by relying on multiple manual clamping, so that the efficiency is low, and positioning accumulative errors are easily caused by repeated clamping. According to the invention, the double overturning assemblies are innovatively adopted to cooperate with the industrial camera arrays on the two portal frames, so that full-surface detection can be completed only through two times of overturning. Specifically, the two groups of overturning assemblies adopt a reverse swinging strategy, so that different surfaces of a workpiece are exposed in stages in the detection process, and a multi-view image fusion algorithm is matched, so that a detection blind area can be thoroughly eliminated, and full-coverage detection of surface cracks is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of workpiece crack detection, and particularly to a workpiece crack detection device for mechanical processing. Background Art

[0002] As one of the most serious machining defects, surface cracks with a critical size exceeding 50 μm will cause a 30 - 50% decrease in the fatigue strength of workpieces. Especially for key components such as automotive braking systems, the existence of surface cracks may lead to catastrophic failures. Therefore, it is necessary to detect surface cracks of machined workpieces. Existing detection equipment mainly has the following problems: 1. Traditional detection equipment adopts a fixed detection table design. For hexahedron workpieces, at least 6 clamping operations are required to complete the full - surface detection. Each re - clamping will introduce a certain positioning deviation, which will affect the consistency of detection results; 2. For special - shaped curved - surface workpieces, existing detection equipment lacks a suitable positioning structure during clamping, which is extremely likely to cause accidental displacement of the workpiece during detection, thus affecting the accuracy of detection results. Summary of the Invention

[0003] The purpose of the present invention is to provide a workpiece crack detection device for mechanical processing to solve the problems raised in the above - mentioned background art.

[0004] To achieve the above - mentioned purpose, the present invention provides the following technical solution: A workpiece crack detection device for mechanical processing, comprising: a workbench, on which a conveyor belt is arranged; two gantry frames arranged in a front - to - back arrangement are also provided on the workbench; a plurality of industrial cameras are arranged on each gantry frame; a positioning unit is also provided on the workbench, the positioning unit includes two positioning frames symmetrically arranged on both sides of the conveyor belt respectively, and the positioning unit further includes a lifting drive device for driving the positioning frames to move up and down. It is characterized in that it further includes two groups of flipping assemblies corresponding to the two gantry frames respectively. Each flipping assembly includes two flipping groups symmetrically arranged on the two positioning frames respectively. A clamping assembly is arranged on the flipping group, and the two groups of flipping assemblies drive the clamping assemblies to swing in opposite directions.

[0005] Further, the flipping group includes a flipping drive device installed on the positioning frame. The output end of the flipping drive device is connected with a flipping turntable that can rotate relative to the positioning frame through a flipping rotating shaft. The centroid of the flipping turntable does not coincide with the axis of the flipping rotating shaft.

[0006] The clamping assembly is eccentrically arranged on the flipping turntable.

[0007] Further, the clamping assembly includes a clamping drive device installed on the flipping turntable, and the output end of the clamping drive device is connected with a clamping plate.

[0008] Further, an installation plate is provided on the clamping plate, and the inner end face of the installation plate is flush with the inner end face of the clamping plate. Two storage grooves are provided at the inner end of the installation plate, and two compensation driving devices corresponding to the two storage grooves are provided at the outer end of the installation plate. The output end of the compensation driving device is connected to an angle adjustment driving device that can telescopically move relative to the installation plate, and the output end of the angle adjustment driving device is connected to a special-shaped positioning rotating plate that can rotate relative to the installation plate;

[0009] The compensation driving device acts on the special-shaped positioning rotating plate so that the special-shaped positioning rotating plate can be stored in the storage groove; the angle adjustment driving device acts on the special-shaped positioning rotating plate so that the special-shaped positioning rotating plate can rotate relative to the installation plate.

[0010] Further, a plurality of length adjustment driving devices are provided at the inner end of the special-shaped positioning rotating plate, and the plurality of length adjustment driving devices are equidistantly distributed along the length direction of the special-shaped positioning rotating plate;

[0011] The output end of the length adjustment driving device is connected to a clamping block, and the clamping block is spherical.

[0012] Further, a pressure sensor is connected to the output end of the length adjustment driving device, and the clamping block is connected to the pressure sensor.

[0013] Further, a flexible strip is further included, and a limiting groove is provided on the flexible strip;

[0014] A plurality of the clamping blocks of the same special-shaped positioning rotating plate are movably inserted into the limiting groove.

[0015] Further, fixing components are detachably connected to both ends of the flexible strip;

[0016] The fixing component includes a first fixing plate. A connecting rod connected to the special-shaped positioning rotating plate is provided at the outer end of the first fixing plate, and a second fixing plate is connected to the inner end of the first fixing plate through a buckling mechanism;

[0017] An installation cavity is provided at the inner end of the first fixing plate. A pressing plate located in the installation cavity is rotatably connected to the first fixing plate through a rotating rod, and a torsion spring for resetting the rotation angle of the pressing plate is further provided on the rotating rod;

[0018] The end of the flexible strip is placed in the area between the first fixing plate and the second fixing plate, and the torsion spring acts on the pressing plate so that the free end of the pressing plate has a tendency to extend out of the installation cavity and press against the flexible strip.

[0019] Further, a plurality of teeth are provided at the free end of the pressing plate.

[0020] Furthermore, two sets of support components are arranged on the clamping plate, which are respectively located on both sides of the mounting plate, and the two sets of support components respectively correspond to the two special-shaped positioning rotating plates on the same clamping plate;

[0021] The support component includes a support driving device, the output end of the support driving device is connected with a support bar adapted to the outer surface of the mounting plate, and the inner end face of the support bar can support on the outer end face of the special-shaped positioning rotating plate.

[0022] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0023] 1. Traditional detection equipment needs to rely on multiple manual clamping to achieve full-surface coverage detection of workpieces, which is not only inefficient, but also repeated clamping is likely to introduce cumulative positioning errors. The present invention innovatively adopts two flipping components to cooperate with the industrial camera arrays on the two gantry frames, and only two flips are required to complete full-surface detection. Specifically, the two sets of flipping components adopt a reverse swing strategy (such as the rear group flips clockwise and the front group flips counterclockwise), so that different surfaces of the workpiece are exposed in stages during the detection process. Combined with the multi-view image fusion algorithm, the detection blind area can be completely eliminated to ensure the full coverage rate detection of surface cracks;

[0024] 2. In the clamping component of the present invention, when the workpiece is large in size and regular in shape, the clamping plate can directly clamp the workpiece; when the workpiece is small in size, the compensation driving device needs to be started to extend the special-shaped positioning rotating plate, and the special-shaped positioning rotating plate is used to clamp the workpiece. Among them, if the shape of the workpiece is special and has a certain special shape, the angle adjustment driving device also needs to be started to adjust the angle of the special-shaped positioning rotating plate to clamp the workpiece; when the workpiece is a special-shaped part with a complex curved surface, the specific length adjustment driving device also needs to be adjusted to extend the clamping block so that the clamping block fits tightly against the surface of the workpiece with appropriate force to ensure the clamping reliability of the workpiece. In this way, the surface of the workpiece can be prevented from being scratched while ensuring the clamping reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is the first structural schematic diagram of the present invention;

[0026] Figure 2 is the second structural schematic diagram of the present invention;

[0027] Figure 3 is the first sectional structural schematic diagram of the present invention;

[0028] Figure 4 is the second sectional structural schematic diagram of the present invention;

[0029] Figure 5 is the first partial structural schematic diagram of the clamping component in the present invention;

[0030] Figure 6This is the second partial structural schematic diagram of the clamping component in the present invention;

[0031] Figure 7 This is the structural schematic diagram of the fixing component in the present invention;

[0032] Figure 8 In the present invention Figure 4 The enlarged schematic diagram at position B in

[0033] In the figure: 1, workbench; 2, conveyor belt; 3, gantry; 4, industrial camera; 5, lifting drive device; 51, positioning frame; 6, flipping component; 61, flipping drive device; 62, flipping rotating shaft; 63, flipping rotating plate; 7, clamping component; 71, clamping drive device; 72, clamping plate; 73, mounting plate; 74, storage groove; 75, compensation drive device; 76, angle adjustment drive device; 77, special-shaped positioning rotating plate; 78, length adjustment drive device; 79, clamping block; 710, pressure sensor; 711, flexible strip; 712, limiting groove; 8, fixing component; 81, connecting rod; 82, first fixing plate; 83, buckling mechanism; 831, inserting rod; 84, second fixing plate; 85, mounting cavity; 86, pressing plate; 87, locking teeth; 9, support component; 91, support drive device; 92, support strip. Detailed implementation manners

[0034] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0035] Please refer to Figures 1-8 , the workpiece crack detection device for machining shown in the figure, including: a workbench 1, a conveyor belt 2 is arranged on the workbench 1, two gantries 3 arranged in the front-rear direction are further arranged on the workbench 1, a plurality of industrial cameras 4 are arranged on each gantry 3, a positioning unit is further arranged on the workbench 1, the positioning unit includes two positioning frames 51 respectively located on both sides of the conveyor belt 2 and symmetrically arranged, and the positioning unit further includes a lifting drive device 5 for driving the positioning frame 51 to move up and down. It is characterized in that it further includes two sets of flipping components 6 respectively corresponding to the two gantries 3, each flipping component 6 includes two flipping groups respectively located on the two positioning frames 51 and symmetrically arranged, a clamping component 7 is arranged on the flipping group, and the two sets of flipping components 6 respectively drive the clamping component 7 to swing in opposite directions.

[0036] In this embodiment, the coordinated cooperation of a double gantry multi-camera detection system and a symmetric flipping and positioning mechanism is adopted to achieve automatic detection of the entire surface of the workpiece. During application, the workpiece to be inspected is transported to the detection station by the conveyor belt 2, and the lifting drive device 5 drives the positioning frames 51 on both sides to rise synchronously, so that the workpiece is separated from the conveyor belt and enters the stable detection position. The positioning frames 51 are symmetrically arranged to ensure that the workpiece remains horizontal during the lifting process and avoid offset or tilt caused by unilateral force. The clamping assembly 7 automatically clamps the workpiece after positioning to ensure that it does not displace during the subsequent flipping process. The two flipping assemblies 6 cooperate with the industrial cameras 4 on the two gantries 3 respectively, and adopt a swinging strategy in opposite directions (for example, one group flips clockwise and the other group flips counterclockwise), so that different surfaces of the workpiece are exposed in stages during the detection process. Specifically, in the first detection stage: the first group of flipping assemblies (the flipping assembly located at the rear with the conveying direction of the conveyor belt 2 as the front) drives the workpiece to rotate a certain angle, so that the initially hidden side faces the industrial camera 4, and the crack scanning of this surface is completed; in the second detection stage: the second group of flipping assemblies continues to rotate the workpiece in the reverse direction, so that the other side enters the camera's field of view, realizing multi-angle and dead-angle-free detection. After the full-surface detection is completed, the flipping assembly 6 resets the workpiece to the initial horizontal position, and the lifting drive device 5 lowers the positioning frame 51, so that the workpiece falls back onto the conveyor belt 2 again and enters the next process.

[0037] Among them, the industrial cameras 4 are arranged in an array on the gantry 3, which can cover the surfaces of different regions of the workpiece, and improve the crack recognition accuracy through multi-view image fusion technology. The lifting drive device 5 can be selected as a cylinder or the like.

[0038] Traditional detection equipment requires multiple manual clamps (such as 6 times for a hexahedron workpiece), while in this embodiment, through the coordinated swinging of the double flipping assemblies, the full-surface detection can be completed within 2 flips, which can effectively improve the detection efficiency.

[0039] Preferably, the flipping group includes a flipping drive device 61 installed on the positioning frame 51. The output end of the flipping drive device 61 is connected with a flipping turntable 63 that can rotate relative to the positioning frame 51 through a flipping rotating shaft 62. The centroid of the flipping turntable 63 does not coincide with the axis of the flipping rotating shaft 62;

[0040] The clamping assembly 7 is eccentrically arranged on the flipping turntable 63.

[0041] In this embodiment, the eccentric setting of the flipping group on the positioning frame 51 can increase the rotation range of the flipping turntable 63. In this way, when the flipping assembly 6 drives the workpiece to swing through the clamping assembly 7, the outer surface of the workpiece can be fully exposed within the photographing fields of each industrial camera. In this way, the industrial camera can fully and thoroughly photograph and detect the outer surface of the workpiece, thereby avoiding missed detection and improving the reliability of the scratch detection on the workpiece surface.

[0042] Among them, the flipping drive device 61 can be a reduction motor.

[0043] Preferably, the clamping assembly 7 includes a clamping drive device 71 installed on the flipping turntable 63, and the output end of the clamping drive device 71 is connected to a clamping plate 72.

[0044] In this embodiment, the clamping drive device 71 can be a cylinder. When it is necessary to clamp the workpiece by the clamping plate 72, the telescoping of the clamping plate 72 can be started through the clamping drive device 71.

[0045] Preferably, an installation plate 73 with an inner end face flush with the inner end face of the clamping plate 72 is provided on the clamping plate 72. Two storage grooves 74 are provided at the inner end of the installation plate 73. Two compensation drive devices 75 corresponding to the two storage grooves 74 are provided at the outer end of the installation plate 73. The output end of the compensation drive device 75 is connected to an angle adjustment drive device 76 that can telescopically move relative to the installation plate 73. The output end of the angle adjustment drive device 76 is connected to a special-shaped positioning turntable 77 that can rotate relative to the installation plate 73;

[0046] The compensation drive device 75 acts on the special-shaped positioning turntable 77 so that the special-shaped positioning turntable 77 can be received in the storage groove 74; the angle adjustment drive device 76 acts on the special-shaped positioning turntable 77 so that the special-shaped positioning turntable 77 can rotate relative to the installation plate 73.

[0047] In this embodiment, when the workpiece is large in size and regular in shape, the workpiece can be directly clamped by the clamping plate 72; when the workpiece is small in size, the compensation drive device 75 needs to be started to extend the special-shaped positioning turntable 77, and the workpiece is clamped by the special-shaped positioning turntable 77. Among them, if the shape of the workpiece is special and has a certain special shape, the angle adjustment drive device 76 also needs to be started to adjust the angle of the special-shaped positioning turntable 77 to clamp the workpiece.

[0048] Among them, the compensation drive device 75 can be a cylinder; the angle adjustment drive device 76 can be a reduction motor.

[0049] Preferably, a plurality of length adjustment drive devices 78 are provided at the inner end of the special-shaped positioning turntable 77, and the plurality of length adjustment drive devices 78 are equidistantly distributed along the length direction of the special-shaped positioning turntable 77;

[0050] The output end of the length adjustment drive device 78 is connected to a clamping block 79, and the clamping block 79 is spherical.

[0051] In this embodiment, when the workpiece is a special-shaped part with a complex curved surface, first, the compensation driving device 75 pushes the special-shaped positioning rotating plate 77 to extend from the storage groove 74, and then the angle adjustment driving device 76 is started to drive the special-shaped positioning rotating plate 77 to rotate so that the clamping block 79 can align with a suitable position on the side surface of the workpiece. When the clamping block 79 abuts against the side surface of the workpiece, the specific length adjustment driving device 78 can be adjusted to extend and retract the clamping block 79 so that the clamping block 79 fits tightly against the surface of the workpiece with a suitable force, thereby ensuring the clamping reliability of the workpiece. In this way, the surface of the workpiece can be prevented from being scratched while ensuring the clamping reliability.

[0052] Among them, the length adjustment driving device 78 can be selected as an electric push rod.

[0053] Preferably, a pressure sensor 710 is connected to the output end of the length adjustment driving device 78, and the clamping block 79 is connected to the pressure sensor 710.

[0054] Through the pressure sensor 710, the clamping force between the clamping block 79 and the side surface of the workpiece can be accurately controlled, thereby better avoiding the surface of the workpiece from being scratched and improving the reliability of the detection device.

[0055] Preferably, it further includes a flexible strip 711, and a limiting groove 712 is formed in the flexible strip 711;

[0056] A plurality of the clamping blocks 79 on the same special-shaped positioning rotating plate 77 are movably inserted into the limiting groove 712.

[0057] In this embodiment, by placing the flexible strip 711 between the clamping block 79 and the surface of the workpiece, direct contact between the clamping block 79 and the surface of the workpiece can be avoided, and the surface of the workpiece can be maximally prevented from being scratched by the clamping block 79, further improving the reliability of the detection device. In addition, the flexible strip 711 can be made of rubber or silica gel materials. The flexible strip 711 can better adapt to various curves or curved surfaces of the workpiece surface, so that it can more reliably abut against the workpiece surface and improve the clamping reliability of the clamping assembly 7 for the workpiece.

[0058] Preferably, both ends of the flexible strip 711 are detachably connected with a fixing component 8;

[0059] The fixing component 8 includes a first fixing plate 82. A connecting rod 81 connected to the special-shaped positioning rotating plate 77 is arranged at the outer side end of the first fixing plate 82, and a second fixing plate 84 is connected to the inner side end of the first fixing plate 82 through a buckling mechanism 83;

[0060] An installation cavity 85 is formed at the inner side end of the first fixing plate 82. A pressing plate 86 located in the installation cavity 85 is rotatably connected to the first fixing plate 82 through a rotating rod, and a torsion spring for resetting the rotation angle of the pressing plate 86 is further arranged on the rotating rod;

[0061] The end portion of the flexible strip 711 is placed in the area between the first fixing plate 82 and the second fixing plate 84. The torsion spring acts on the pressing plate 86, so that the free end of the pressing plate 86 has a tendency to extend out of the installation cavity 85 and press against the flexible strip 711.

[0062] In this embodiment, the fastening mechanism 83 may include a plug rod 831 connected to the second fixing plate 84 and a jack formed on the first fixing plate 82. Through the cooperation of the plug rod 831 and the jack, the clamping and fixing of the fastening mechanism 83 can be achieved. During application, only need to place the end portion of the flexible strip 711 in the area between the first fixing plate 82 and the second fixing plate 84, and then insert the plug rod 831 into the jack until the plug rod 831 is clamped and fixed. At this time, the torsion spring will make the pressing plate 86 apply a pressing force to the flexible strip 711. In this way, the fixing work of the flexible strip 711 can be conveniently completed, so as to facilitate the replacement of the flexible strip 711, and effectively improve the practicability of the detection device.

[0063] Preferably, a plurality of teeth 87 are provided at the free end of the pressing plate 86.

[0064] In this embodiment, the teeth 87 can enhance the clamping force on the flexible strip 711, so as to further improve the fixing reliability of the flexible strip 711 and ensure that the flexible strip 711 can be stably and reliably clamped.

[0065] Preferably, two sets of support components 9 are provided on the clamping plate 72 and are respectively located on both sides of the mounting plate 73. The two sets of support components 9 respectively correspond to the two special-shaped positioning rotating plates 77 on the same clamping plate 72;

[0066] The support component 9 includes a support driving device 91. The output end of the support driving device 91 is connected with a support strip 92 adapted to the outer surface of the mounting plate 73. The inner end face of the support strip 92 can support on the outer end face of the special-shaped positioning rotating plate 77.

[0067] In this embodiment, the support driving device 91 can be selected as a cylinder. During application, when the special-shaped positioning rotating plate 77 extends under the drive of the compensation driving device 75 and rotates under the drive of the angle adjustment driving device 76, the support driving device 91 can be started to extend the support strip 92 to support on the end face of the special-shaped positioning rotating plate 77 to improve the clamping stability of the special-shaped positioning rotating plate 77.

[0068] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. Workpiece crack detection device for machining, comprising: Workbench (1), a conveyor belt (2) is arranged on the workbench (1), two gantry frames (3) arranged front and back are also arranged on the workbench (1), a plurality of industrial cameras (4) are arranged on each gantry frame (3), a positioning unit is also arranged on the workbench (1), the positioning unit includes two positioning frames (51) symmetrically arranged on both sides of the conveyor belt (2), the positioning unit further includes a lifting drive device (5) for driving the positioning frames (51) to move up and down, and is characterized in that it further includes two groups of flipping assemblies (6) corresponding to the two gantry frames (3) respectively, each flipping assembly (6) includes two flipping groups symmetrically arranged on the two positioning frames (51), a clamping assembly (7) is arranged on the flipping group, and the two groups of flipping assemblies (6) drive the clamping assemblies (7) to swing in opposite directions.

2. The workpiece crack detection device for machining according to claim 1, characterized in that: The flipping group includes a flipping drive device (61) installed on the positioning frame (51), the output end of the flipping drive device (61) is connected with a flipping rotating plate (63) that can rotate relative to the positioning frame (51) through a flipping rotating shaft (62), and the centroid of the flipping rotating plate (63) does not coincide with the axis line of the flipping rotating shaft (62); The clamping assembly (7) is eccentrically arranged on the flipping rotating plate (63).

3. The workpiece crack detection device for machining according to claim 1, characterized in that: The clamping assembly (7) includes a clamping drive device (71) installed on the flipping rotating plate (63), and the output end of the clamping drive device (71) is connected with a clamping plate (72).

4. The workpiece crack detection device for machining according to claim 3, wherein: An installation plate (73) with an inner end face flush with the inner end face of the clamping plate (72) is arranged on the clamping plate (72), two storage grooves (74) are opened at the inner end of the installation plate (73), two compensation drive devices (75) corresponding to the two storage grooves (74) respectively are arranged at the outer end of the installation plate (73), the output end of the compensation drive device (75) is connected with an angle adjustment drive device (76) that can stretch relative to the installation plate (73), and the output end of the angle adjustment drive device (76) is connected with a special-shaped positioning rotating plate (77) that can rotate relative to the installation plate (73); The compensation drive device (75) acts on the special-shaped positioning rotating plate (77) so that the special-shaped positioning rotating plate (77) can be stored in the storage groove (74); the angle adjustment drive device (76) acts on the special-shaped positioning rotating plate (77) so that the special-shaped positioning rotating plate (77) can rotate relative to the installation plate (73).

5. The workpiece crack detection device for machining according to claim 4, characterized in that: A plurality of length adjustment drive devices (78) are arranged at the inner end of the special-shaped positioning rotating plate (77), and the plurality of length adjustment drive devices (78) are equidistantly distributed along the length direction of the special-shaped positioning rotating plate (77); The output end of the length adjustment drive device (78) is connected with a clamping block (79), and the clamping block (79) is spherical.

6. The workpiece crack detection device for machining according to claim 5, characterized in that: A pressure sensor (710) is connected to the output end of the length adjustment drive device (78), and the clamping block (79) is connected to the pressure sensor (710).

7. The workpiece crack detection device for machining according to claim 5, characterized in that: A flexible strip (711) is further included, and a limiting groove (712) is opened on the flexible strip (711); A plurality of the clamping blocks (79) on the same special-shaped positioning rotating plate (77) are movably inserted into the limiting groove (712).

8. The workpiece crack detection device for machining according to claim 7, characterized in that: Both ends of the flexible strip (711) are detachably connected with fixing components (8); The fixing component (8) includes a first fixing plate (82). A connecting rod (81) connected to the special-shaped positioning rotating plate (77) is arranged at the outer side end of the first fixing plate (82). The inner side end of the first fixing plate (82) is connected with a second fixing plate (84) through a buckling mechanism (83); An installation cavity (85) is formed at the inner side end of the first fixing plate (82). A pressing plate (86) located in the installation cavity (85) is rotatably connected to the first fixing plate (82) through a rotating rod. A torsion spring for resetting the rotation angle of the pressing plate (86) is further arranged on the rotating rod; The end of the flexible strip (711) is placed in the area between the first fixing plate (82) and the second fixing plate (84). The torsion spring acts on the pressing plate (86), so that the free end of the pressing plate (86) has a tendency to extend out of the installation cavity (85) and press against the flexible strip (711).

9. The workpiece crack detection device for machining according to claim 8, wherein: A plurality of teeth (87) are arranged at the free end of the pressing plate (86).

10. The workpiece crack detection device for machining according to claim 5, wherein: Two groups of supporting components (9) are arranged on the clamping plate (72) and are respectively located on both sides of the mounting plate (73). The two groups of supporting components (9) respectively correspond to the two special-shaped positioning rotating plates (77) on the same clamping plate (72); The supporting component (9) includes a supporting driving device (91). The output end of the supporting driving device (91) is connected with a supporting strip (92) adapted to the outer surface of the mounting plate (73). The inner end face of the supporting strip (92) can support on the outer end face of the special-shaped positioning rotating plate (77).

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