Fastener detection system and detection method

Abstract

The invention relates to a fastener detection system and method, and the system comprises a detection fixture which is provided with a first roller, a second roller and a third roller, the third roller is movably disposed, and the distance between the third roller and the first roller and the distance between the third roller and the second roller are adjusted by moving the third roller. The three rollers are used for clamping at least part of the fastener among the three rollers; the output end of the driving device is connected with the first roller or the second roller so as to drive the first roller or the second roller to rotate by a preset angle; the image acquisition device is used for acquiring image information of the detection position of the fastener; and the display is electrically connected with the image acquisition device. According to the invention, a detection mode of manually rotating the fastener can be replaced, the cost is reduced, the detection efficiency is improved, and the detection automation degree and the detection accuracy are improved.

Description

Technical Field

[0001] The present invention relates to the field of aviation technology, and further to a fastener detection system and detection method, and in particular to a detection system and detection method for an external thread forming blank and external thread of an aviation fastener. Background Art

[0002] At present, the detection of the outer contour of aviation fasteners (such as the detection of the diameter, coaxiality and roundness of the external thread forming blanks in aviation fasteners, the major diameter, middle diameter and minor diameter dimensions, tooth shape dimensions, etc. of the external threads in aviation fasteners) is more and more widely used in thread processing systems, and the actual demand is also increasing. It is very difficult to objectively evaluate the overall diameter, coaxiality and roundness of the fastener thread blanks through conventional measurements. At the same time, when the major diameter, middle diameter and minor diameter dimensions, tooth shape dimensions, pitch, etc. of the external threads of the fasteners in the circumferential direction are manually detected, multiple measurements are required at the same position. Only by handheld circular rotation measurement can a relatively reasonable range be measured. However, the handheld measurement method has the disadvantages of large errors, time-consuming and labor-intensive. Once the detection error is large or the detection is inaccurate, and the product quality problem is not detected in the production process, resulting in delayed discovery of the above defects, it is necessary to add rework or repair processes in the subsequent processes to eliminate the above defects, which will directly or indirectly increase the time and labor costs for fastener production; if the above defects of the fasteners are not discovered in time during the entire manufacturing process, the fasteners after molding will be scrapped in batches; if the defective fasteners are circulated and used on aircraft, there is a risk that the fatigue fracture limit of the fasteners will be greatly reduced, which will have a great impact on the service life of the fasteners, and will pose a safety hazard, which may cause immeasurable losses.

[0003] The existing inspection method is that the operator places the fastener in the V-groove of a simple positioning tool, and the operator rotates the head of the fastener with his fingers. The fastener is easy to fall from the V-groove during the rotation process. The image of the fastener is collected by the imager during the rotation of the fastener, but the image display is not clear and the image is discontinuous. Therefore, the focus needs to be adjusted frequently, the operation is cumbersome, and the workload is large. In addition, there are problems such as large deviations between the inspection results and the actual values ​​and low inspection efficiency. If a defect on the fastener cannot be discovered in time during the inspection process, it will lead to defects in the fastener during batch processing, which is easy to cause batch scrapping.

[0004] In the related art, the outer contour of fasteners is mostly detected manually, which is not only time-consuming and labor-intensive, but also has low detection efficiency and the problem of low accuracy of detection results.

[0005] Therefore, the present invention provides a fastener detection system and a detection method to overcome the defects of the prior art. Summary of the invention

[0006] The object of the present invention is to provide a fastener detection system and detection method, which replaces the detection method of manually rotating fasteners, reduces costs, improves detection efficiency, and improves the degree of automation and detection accuracy.

[0007] The purpose of the present invention can be achieved by adopting the following scheme:

[0008] The present invention provides a fastener detection system, the fastener detection system comprising:

[0009] A detection fixture, wherein the detection fixture comprises a first roller, a second roller and a third roller, wherein the third roller is movably arranged relative to the first roller and the second roller, and the spacing between the third roller and the first roller and the second roller is adjusted by moving the third roller, so as to clamp at least a part of the fastener between the first roller, the second roller and the third roller;

[0010] A driving device, wherein an output end of the driving device is connected to the first roller or the second roller to drive the first roller or the second roller to rotate a preset angle;

[0011] An image acquisition device, the image acquisition device is arranged toward the detection position of the fastener to acquire image information of the detection position of the fastener;

[0012] A display, wherein a signal receiving end of the display is electrically connected to a signal output end of the image acquisition device to display the image information.

[0013] In a preferred embodiment of the present invention, the detection fixture includes a shell, the shell has a accommodating cavity, the shell has a mounting hole connected to the accommodating cavity, the first roller, the second roller and the third roller are all rotatably arranged in the accommodating cavity, and the positions between the first roller, the second roller and the third roller are opposite to the mounting hole, so that the detection position of the fastener clamped between the first roller, the second roller and the third roller extends from the mounting hole to the outside of the shell.

[0014] In a preferred embodiment of the present invention, the detection fixture also includes a first rotating shaft, a second rotating shaft and a third rotating shaft arranged in parallel, the first rotating shaft, the second rotating shaft and the third rotating shaft are respectively located at the three vertices of a triangle and are respectively rotatably connected to the housing, the first roller, the second roller and the third roller are respectively arranged on the first rotating shaft, the second rotating shaft and the third rotating shaft, and the output end of the driving device is connected to the first rotating shaft or the second rotating shaft to drive the fastener to rotate the preset angle with the first roller or the second roller.

[0015] In a preferred embodiment of the present invention, the shell also has a guide hole connected to the accommodating cavity, the guide hole is a long hole, one end of the guide hole is connected to the mounting hole, and the other end of the guide hole extends away from the first roller and the second roller, and the third rotating shaft can be movably embedded in the guide hole to adjust the distance between the third roller and the first roller and the second roller.

[0016] In a preferred embodiment of the present invention, a limit bolt is provided on the housing, the screw of the limit bolt extends into the accommodating cavity, and the third rotating shaft can abut against the screw of the limit bolt when moving along the guide hole;

[0017] A return spring is sleeved on the screw rod of the limiting bolt, one end of the return spring is connected to the inner wall of the shell, and the other end of the return spring can be against the third rotating shaft.

[0018] In a preferred embodiment of the present invention, a positioning plate is provided on the outside of the housing and on the same side as the detection position of the fastener, and the end of the fastener can abut against the positioning plate, and the positioning plate is used to locate the position of the fastener.

[0019] In a preferred embodiment of the present invention, the detection fixture also includes a long strip of position adjustment block, which is movably arranged on the shell along its length direction, and the positioning plate is connected to the position adjustment block. The position adjustment block is provided with a plurality of plug holes spaced apart along its length direction, and the shell is provided with a locking bolt, which is inserted into the plug hole corresponding to it to position the position adjustment block.

[0020] In a preferred embodiment of the present invention, the detection fixture further comprises a bottom plate arranged in a horizontal direction, and the bottom of the housing is fixed to the top surface of the bottom plate.

[0021] In a preferred embodiment of the present invention, the driving device is a driving motor.

[0022] In a preferred embodiment of the present invention, the image acquisition device is an imager.

[0023] The present invention provides a fastener detection method, which uses the above-mentioned fastener detection system to detect fasteners. The fastener detection method comprises the following steps:

[0024] Preset multiple sets of standard parameters of the detection position of the fastener in the circumferential direction;

[0025] The fastener is mounted on a detection fixture, and the detection position of the fastener is aligned with an image acquisition device;

[0026] Presetting a single rotation angle of the fastener;

[0027] The fastener rotates multiple times in one direction according to the preset rotation angle, and the fastener stops rotating in a time period between two adjacent rotations. When the fastener stops rotating, the image acquisition device acquires images of the detection position of the fastener to obtain multiple sets of image information;

[0028] Acquiring multiple groups of actual parameters of the fastener according to the multiple groups of image information;

[0029] The multiple groups of actual parameters are compared with the corresponding multiple groups of standard parameters to determine whether the dimensional parameters of the detection position of the fastener meet the requirements.

[0030] In a preferred embodiment of the present invention, after the image information is obtained, the image information is magnified.

[0031] In a preferred embodiment of the present invention, the fastener comprises a blank without threads and a formed fastener with threads formed;

[0032] When the fastener is a blank without forming threads, the standard parameters and the actual parameters include the diameter, coaxiality and / or roundness of the detection position;

[0033] When the fastener is a formed fastener with formed threads, the standard parameters and the actual parameters include the major diameter size, the middle diameter size, the minor diameter size and / or the thread shape size of the external thread.

[0034] In a preferred embodiment of the present invention, when the fastener is a blank without thread forming,

[0035] Pre-drawing a standard drawing of the fastener, and determining at least a standard center line and a standard outer contour line of the fastener on the standard drawing;

[0036] The image acquisition device acquires a plurality of sets of image information of the fastener, and generates an actual center line and an actual contour line of the fastener from the image information;

[0037] The actual center line is compared with the standard center line to determine whether the coaxiality of the fastener meets the requirements; and / or the actual contour line is compared with the standard contour line to determine whether the roundness of the fastener meets the requirements.

[0038] In a preferred embodiment of the present invention, the fastener is divided into multiple sections along the length direction of the fastener, and the diameter size of the fastener at each dividing line position is obtained.

[0039] In a preferred embodiment of the present invention, when the fastener is a threaded molded fastener,

[0040] Pre-drawing a standard drawing of the fastener, and determining at least the standard major diameter marking line, the standard middle diameter marking line, the standard minor diameter marking line and the standard thread shape size value of the fastener on the standard drawing;

[0041] The image acquisition device acquires a plurality of sets of image information of the fastener, and generates an actual major diameter marking line, an actual middle diameter marking line, an actual minor diameter marking line and an actual thread shape dimension value of the fastener from the image information;

[0042] The standard major diameter marking is compared with the actual major diameter marking to determine whether the major diameter of the fastener meets the requirements; and / or, the standard middle diameter marking is compared with the actual middle diameter marking to determine whether the middle diameter of the fastener meets the requirements; and / or, the standard minor diameter marking is compared with the actual minor diameter marking to determine whether the minor diameter of the fastener meets the requirements; and / or, the standard tooth shape size value is compared with the actual tooth shape size value to determine whether the tooth shape size of the fastener meets the requirements.

[0043] As described above, the features and advantages of the fastener detection system and detection method of the present invention are:

[0044] A detection fixture having a first roller, a second roller and a third roller is provided. By moving the position of the third roller, the spacing between the third roller and the first roller and the second roller can be adjusted, so as to adapt to fasteners of different radial sizes, so as to ensure that the fastener to be detected can be stably clamped between the first roller, the second roller and the third roller, so as to ensure that the fastener maintains good stability when the image of the fastener is collected, thereby ensuring the accuracy of the image information of the collected fastener, and minimizing the detection error; during the detection process, the first roller or the second roller can be driven by the driving device to rotate a preset angle, so as to provide a driving force for the rotation of the fastener, and the image information of the fastener at different rotation angles can be respectively collected by the image acquisition device to obtain image information of different positions of the fastener in the circumferential direction, and finally displayed on the display. The whole process does not require manual rotation of the fastener, which effectively reduces time cost and labor cost and improves detection efficiency;

[0045] The image information of the fastener is collected by the image acquisition device, and the actual information collected is compared with the standard information. The fastener can be driven by the driving device to rotate accurately at a preset angle, thereby improving the degree of automation of detection, the accuracy of detection and the comparison and recognition effect of the image, and can effectively avoid rework or repair or even scrapping of fasteners during mass production, avoid unnecessary losses, ensure the quality and service life of fasteners, and ensure safety in use. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] The following drawings are only intended to illustrate and explain the present invention, and are not intended to limit the scope of the present invention.

[0047] in:

[0048] Figure 1 It is a structural schematic diagram of the fastener detection system of the present invention;

[0049] Figure 2 A three-dimensional diagram of a detection fixture in the fastener detection system of the present invention;

[0050] Figure 3 It is a front cross-sectional view of the detection fixture in the fastener detection system of the present invention;

[0051] Figure 4 A top view of a detection fixture in the fastener detection system of the present invention;

[0052] Figure 5 This is one of the structural schematic diagrams of the fastener in the fastener detection system of the present invention;

[0053] Figure 6 This is the second structural schematic diagram of the fastener in the fastener detection system of the present invention;

[0054] Figure 7 One of the top views of a fastener installed on a detection fixture in the fastener detection system of the present invention;

[0055] Figure 8 for Figure 7 A partial enlarged view of the location of the inspection fixture;

[0056] Fig. 9 The second top view of the fastener installed on the detection fixture in the fastener detection system of the present invention;

[0057] Fig.10 for Fig. 9 A partial enlarged view of the location of the inspection fixture;

[0058] Fig.11 for Figure 7 A partial enlarged view of the location of the fastener;

[0059] Fig.12 for Fig. 9 A partial enlarged view of the location of the fasteners.

[0060] The accompanying drawings in the present invention are:

[0061] 1. Detection fixture; 101. Shell;

[0062] 1011, mounting hole; 1012, guide hole;

[0063] 1013, accommodating cavity; 102, positioning plate;

[0064] 103. Position adjustment block; 104. Locking bolt;

[0065] 105. bottom plate; 106. first roller;

[0066] 1061, first rotating shaft; 107, second roller;

[0067] 1071, second rotating shaft; 108, third roller;

[0068] 1081, third rotating shaft; 109, limiting bolt;

[0069] 110. Return spring; 2. Driving device;

[0070] 3. Fastener; 4. Image acquisition device;

[0071] 5. Display; 6. Testing platform. DETAILED DESCRIPTION

[0072] The technical solution of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention. After reading the present invention, various equivalent forms of modifications to the present invention by those skilled in the art all fall within the scope defined by the claims attached to this application.

[0073] It should be noted that when an element is referred to as being "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0074] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0075] The present invention is mainly applied to the detection of diameter, coaxiality and roundness of blanks of aviation fasteners (such as bolts for aircraft) in the state where external threads are not formed; in addition, it can also be applied to the detection of radial dimensions (major diameter, middle diameter and minor diameter dimensions) and tooth shape dimensions of external threads of aviation fasteners (such as bolts for aircraft) in the state where external threads are formed.

[0076] Implementation Method 1

[0077] like Figures 1 to 10As shown, the present invention provides a fastener detection system, which includes a detection fixture 1, a driving device 2, an image acquisition device 4 and a display 5. The detection fixture 1 has a first roller 106, a second roller 107 and a third roller 108. The first roller 106, the second roller 107 and the third roller 108 are respectively located at three vertices of a triangle, and the third roller 108 is movably arranged relative to the first roller 106 and the second roller 107. The spacing between the third roller 108 and the first roller 106 and the second roller 107 is adjusted by moving the third roller 108, so as to clamp at least part of the position of the fastener 3 between the first roller 106, the second roller 107 and the third roller 108; the output end of the driving device 2 is connected to the first roller 106 or the second roller 107, and the first roller 106 or the second roller 107 is driven by the driving device 2 to rotate a preset angle; the image acquisition device 4 is arranged toward the detection position of the fastener 3 to collect image information of the detection position of the fastener 3. During the detection process, since the first roller 106 and the second roller 107 are both in contact with the fastener 3, when the first roller 106 or the second roller 107 rotates, the friction force on the contact surface will drive the fastener 3 to synchronously rotate by a preset angle, thereby realizing automatic control of the rotation angle of the fastener 3, and then the image information of different circumferential positions of the fastener 3 can be collected by the image acquisition device 4, and then the signal output end of the image acquisition device 4 is electrically connected to the signal receiving end of the display 5, and the image acquisition device 4 transmits the collected image information to the display 5, and the collected image information is displayed by the display 5.

[0078] In the present invention, by providing a detection fixture 1 having a first roller 106, a second roller 107 and a third roller 108, the spacing between the third roller 108 and the first roller 106 and the second roller 107 can be adjusted by moving the position of the third roller 108, so as to adapt to fasteners 3 of different radial sizes, so as to ensure that the fastener 3 to be detected can be stably clamped between the first roller 106, the second roller 107 and the third roller 108, so as to ensure that the fastener 3 has good stability when the image of the fastener 3 is collected, thereby ensuring the accuracy of the image information of the fastener 3 collected, and minimizing the detection error; during the detection process, the first roller 106 or the second roller 107 can be driven by the driving device 2 to rotate a preset angle, thereby providing a driving force for the rotation of the fastener 3, and the image information of the fastener 3 at different rotation angles can be collected by the image acquisition device 4 respectively, so as to obtain image information of the fastener 3 at different positions in the circumferential direction, and finally displayed by the display 5, and the whole process does not require manual rotation of the fastener 3, effectively reducing time cost and labor cost, and improving detection efficiency.

[0079] During the inspection of the fastener 3, the image information of the fastener 3 is collected by the image acquisition device 4, and the actual information collected is compared with the preset standard information of the fastener 3. In addition, the fastener 3 can be driven by the driving device 2 to rotate accurately at a preset angle, thereby improving the degree of automation of the inspection, the accuracy of the inspection and the comparison and recognition effect of the image, thereby effectively avoiding rework or repair or even scrapping of the fastener 3 during the mass production process, avoiding unnecessary losses, ensuring the quality and service life of the fastener 3, and especially ensuring the safety of the fastener 3 when installed on the aircraft.

[0080] In an optional embodiment of the present invention, Figures 2 to 4 As shown, the detection fixture 1 includes a shell 101, the shell 101 is a vertically arranged rectangular frame structure, the shell 101 has a receiving cavity 1013, the shell 101 has a mounting hole 1011 connected to the receiving cavity 1013, the first roller 106, the second roller 107 and the third roller 108 are rotatably arranged in the receiving cavity 1013, the wheel surface of the first roller 106, the wheel surface of the second roller 107 and the wheel surface of the third roller 108 can respectively contact the outer wall surface of the fastener 3 clamped therebetween, and each The contact between the roller and the outer wall surface of the fastener 3 is line contact; the position between the first roller 106, the second roller 107 and the third roller 108 is opposite to the mounting hole 1011, so that the fastener 3 clamped between the first roller 106, the second roller 107 and the third roller 108 can extend from the mounting hole 1011 to the outside of the shell 101 along its length direction, and then the detection position of the fastener 3 can extend from the mounting hole 1011 to the outside of the shell 101, so as to collect graphic information of the detection position of the fastener 3.

[0081] Further, such as Figure 2 and Figure 3As shown, the detection fixture 1 also includes a first rotating shaft 1061, a second rotating shaft 1071 and a third rotating shaft 1081 which are arranged in parallel. The first rotating shaft 1061, the second rotating shaft 1071 and the third rotating shaft 1081 are respectively located at the three vertices of the triangle, and both ends of the first rotating shaft 1061, the second rotating shaft 1071 and the third rotating shaft 1081 are respectively rotatably connected to the housing 101. The first roller 106 is arranged on the first rotating shaft 1061, and the first rotating shaft 1061 is the central rotating shaft of the first roller 106. The second roller 107 is arranged on the second rotating shaft 1071. The second rotating shaft 1071 is the central axis of the second roller 107, and the third roller 108 is arranged on the third rotating shaft 1081. The third rotating shaft 1081 is the central axis of the third roller 108. The driving device 2 is located outside the shell 101, and the output end of the driving device 2 is connected to the end of the second rotating shaft 1071, so as to drive the second rotating shaft 1071 to rotate through the output end of the driving device 2, so as to drive the second roller 107 to rotate, thereby achieving the purpose of driving the fastener 3 to rotate a preset angle with the second roller 107, and realizing the fixed-angle rotation, indexing rotation and the control of the number of rotations of the fastener 3. When the output end of the driving device 2 is connected to the end of the second rotating shaft 1071, the second roller 107 is the driving wheel, and the first roller 106 and the third roller 108 are driven wheels; of course, the output end of the driving device 2 can also be connected to the end of the first rotating shaft 1061, so as to drive the first rotating shaft 1061 to rotate through the output end of the driving device 2, so as to drive the first roller 106 to rotate, and then achieve the purpose of driving the fastener 3 to rotate with the first roller 106 at a preset angle. At this time, the first roller 106 is the driving wheel, and the second roller 107 and the third roller 108 are driven wheels. In the present invention, one driving wheel and two driven wheels clamp the fastener 3, and the contact between each roller and the fastener 3 is line contact, which can ensure the stability of the fastener 3 in the clamping state and the accuracy of positioning.

[0082] The driving device 2 may be a driving motor, and an output shaft of the driving motor is connected to an end of the second rotating shaft 1071 or the third rotating shaft 1081 .

[0083] In a specific embodiment of the present invention, Figure 2As shown, the first rotating shaft 1061 and the second rotating shaft 1071 are distributed on the left and right, and the third rotating shaft 1081 is located above the first rotating shaft 1061 and the second rotating shaft 1071 and in the middle of the first rotating shaft 1061 and the second rotating shaft 1071, that is, the first roller 106 and the second roller 107 are distributed on the left and right, and the third roller 108 is located above the first roller 106 and the second roller 107 and in the middle of the first roller 106 and the second roller 107. The housing 101 also has a guide hole 1012 connected to the accommodating cavity 1013. The guide hole 1012 is a vertically extending long hole. The guide hole 1012 is located above the mounting hole 1011. The bottom end of the guide hole 1012 is connected to the middle position of the top of the mounting hole 1011. The top end of the guide hole 1012 extends vertically away from the first roller 106 and the second roller 107 (i.e., extends vertically upward). The third rotating shaft 1081 can be vertically movably embedded in the guide hole 1012. By adjusting the position of the third rotating shaft 1081 in the guide hole 1012, the spacing between the third roller 108 and the first roller 106 and the second roller 107 can be adjusted to achieve the purpose of adapting to fasteners 3 of different radial sizes.

[0084] Further, such as Figures 2 to 4 As shown, a limiting bolt 109 is provided at the middle position of the top of the housing 101, and the screw of the limiting bolt 109 extends vertically into the accommodating cavity 1013. When the third rotating shaft 1081 moves upward along the guide hole 1012, the third rotating shaft 1081 can move to a position where it abuts against the screw of the limiting bolt 109, thereby limiting the third rotating shaft 1081 through the limiting bolt 109.

[0085] Further, such as Figure 3 As shown, a reset spring 110 is sleeved on the screw rod of the limiting bolt 109, and the top of the reset spring 110 is connected to the top inner wall of the shell 101. When the fastener 3 is set, the third rotating shaft 1081 moves upward, so that the bottom end of the reset spring 110 can be against the top of the third rotating shaft 1081 to provide a certain downward elastic force to the third rotating shaft 1081, so as to ensure that the fastener 3 can be firmly clamped between the first roller 106, the second roller 107 and the third roller 108; when the fastener 3 is removed, the reset spring 110 presses down the third rotating shaft 1081, so that the third roller 108 can return to its original position.

[0086] In an optional embodiment of the present invention, Figure 2 and Figure 4As shown, a positioning plate 102 extending vertically is arranged on the outside of the housing 101 and on the same side as the detection position of the fastener 3. After the fastener 3 is placed between the first roller 106, the second roller 107 and the third roller 108, the end of the fastener 3 can abut against the positioning plate 102, and the position of the fastener 3 is positioned by the positioning plate 102, so as to achieve an accurate, stable and controllable axial positioning of the fastener 3. That is, after the detection positions of different fasteners 3 are set below the image acquisition device 4, after the detection position of the fastener 3 is positioned, it is not necessary to adjust the focus of the image acquisition device 4 to ensure clear and accurate image information acquisition, and it is more convenient and quick to replace the fastener 3.

[0087] Further, such as Figures 2 to 4 As shown, the detection fixture 1 also includes a long strip position adjustment block 103, which extends in the horizontal direction. The position adjustment block 103 is movably arranged on the housing 101 along its length direction. The position adjustment block 103 is located below the positioning plate 102, and the bottom of the positioning plate 102 is connected to the top of the position adjustment block 103. The position adjustment block 103 is provided with a plurality of plug holes at intervals along its length direction. The housing 101 is provided with a locking bolt 104. Before the detection, the position of the position adjustment block 103 relative to the housing 101 can be adjusted, and then the locking bolt 104 is inserted into the plug hole aligned with it to position the position adjustment block 103. The position of the positioning plate 102 can be adjusted by moving the position adjustment block 103, so as to realize the positioning of the fasteners 3 with different axial lengths.

[0088] In an optional implementation of the present invention, Figures 1 to 4 As shown, the detection fixture 1 also includes a bottom plate 105 arranged in the horizontal direction, and the bottom of the housing 101 is fixed on the top surface of the bottom plate 105. The fastener detection system also includes a detection platform 6 arranged in the horizontal direction, and the detection fixture 1 and the drive device 2 are both arranged on the top surface of the detection platform 6. Through the arrangement of the bottom plate 105 and the detection platform 6, the stable placement of the detection fixture is guaranteed, thereby ensuring the accuracy of the detection data. Among them, the bottom plate 105 must meet the gravity requirements, ensure the stability of the detection fixture 1, and it is not easy to move easily after being placed in place.

[0089] In an optional embodiment of the present invention, the image acquisition device 4 may be but is not limited to an imager, which is arranged above the detection fixture 1, and the image acquisition head of the imager is aligned with the detection position of the fastener 3. The imager can achieve focusing during the image acquisition process to ensure that the acquired image information can clearly display the fastener 3.

[0090] The features and advantages of the fastener detection system of the present invention are:

[0091] 1. The fastener detection system can ensure that the fastener 3 can maintain good stability when the image of the fastener 3 is captured, thereby ensuring the accuracy of the captured image information of the fastener 3 and minimizing the detection error.

[0092] 1. During the detection process, the fastener detection system can collect image information of the fastener 3 at different rotation angles to obtain image information of different circumferential positions of the fastener 3, and display it through the display 5. The entire process does not require manual rotation of the fastener 3, effectively reducing time and labor costs and improving detection efficiency.

[0093] 3. The fastener detection system collects image information of the fastener 3 through the image acquisition device 4, and compares the actual information collected with the standard information. The fastener 3 can be driven by the driving device 2 to rotate accurately at a preset angle, thereby improving the degree of automation of detection, the accuracy of detection and the comparison and recognition effect of the image, and can effectively avoid rework or repair or even scrapping of the fastener 3 during the mass production process, avoid unnecessary losses, ensure the quality and service life of the fastener 3, and ensure the safety of use.

[0094] Implementation Method 2

[0095] The present invention provides a fastener detection method, which uses the above-mentioned fastener detection system to detect the fastener 3, and the fastener detection method includes the following steps:

[0096] Step S1: presetting multiple sets of standard parameters of the detection position of the fastener 3 in the circumferential direction;

[0097] Step S2: Figures 7 to 10 , install the fastener 3 on the detection fixture 1, and align the detection position of the fastener 3 with the image acquisition device 4;

[0098] Specifically, in step S2, the position of the positioning plate 102 is adjusted according to the axial length of the fastener 3, so that the distance from the position of the fastener 3 clamped on the detection fixture 1 to the positioning plate 102 is adapted to the axial length of the fastener 3, so as to achieve the purpose of positioning the fastener 3. Afterwards, the position adjustment block 103 is locked by the locking bolt 104 to ensure that the position of the positioning plate 102 does not change.

[0099] Step S3: presetting a single rotation angle of the fastener 3;

[0100] Step S4: The fastener 3 rotates multiple times in one direction according to a preset rotation angle, and the fastener 3 stops rotating during the time period between two adjacent rotations. When the fastener 3 stops rotating, the image acquisition device 4 acquires an image of the detection position of the fastener 3 to obtain Fig.11 and Fig.12Multiple sets of image information shown;

[0101] Specifically, in step S3 and step S4, the single rotation angle of the fastener 3 can be set to 60°, that is, when the fastener 3 is detected, the rotation angle of the fastener 3 relative to the initial position is 60°, 120°, 180°, 240°, 300° and 360°, respectively, to ensure that each circumferential position of the fastener 3 is captured, and after each rotation to an angle, the driving device 2 stops rotating for an interval time (the interval time can be set by itself to ensure that the image information of the fastener 3 can be clearly captured when it stops rotating). During the time when the driving device 2 stops rotating, the image acquisition device 4 captures the image of the detection position of the fastener 3.

[0102] Among them, in step S4, after acquiring the image information, the image information can be magnified. Since the diameter size of the fastener 3 is generally in the range of 3mm-20mm, and the thread pitch is generally in the range of 0.5mm-2mm, the image information can be automatically focused and magnified (such as 5 times, 10 times, 20 times, 50 times, 100 times, 200 times or 500 times, etc.) by the image acquisition device 4 according to the size of the fastener 3, so as to achieve the purpose of accurately identifying and capturing the image information of the fastener 3.

[0103] Step S5: acquiring multiple sets of actual parameters of the fastener according to the multiple sets of image information;

[0104] Step S6: Compare the multiple sets of actual parameters with the corresponding multiple sets of standard parameters to determine whether the dimensional parameters of the detection position of the fastener 3 meet the requirements.

[0105] As shown in Table 1 below, a threshold range of a standard parameter can be preset, and the detected actual parameter can be compared with the standard parameter. If the actual parameter exceeds the threshold range of the standard parameter, it is determined that the detected fastener 3 does not meet the requirements (i.e., it is an unqualified product); if the actual parameter is within the threshold range of the standard parameter or is equal to the two end points of the threshold range, it is determined that the detected fastener 3 meets the requirements (i.e., it is a qualified product).

[0106]

[0107] Table 1

[0108] In an optional embodiment of the present invention, the fastener 3 includes a blank without threads and a formed fastener with threads. The formed fastener with threads can be, but is not limited to, a hexagonal head bolt, a pan head bolt, a countersunk bolt, and a flat head bolt; in addition, the material of the fastener 3 can be metal or non-metal.

[0109] In an optional embodiment of the present invention, Figure 5 As shown, when the fastener 3 is a blank without threads formed therein, the standard parameters and the actual parameters include the diameter, coaxiality and / or roundness of the detection position.

[0110] The detection process includes: pre-drawing a standard graphic of the fastener 3 (the standard image can be drawn by existing image software), and determining at least the standard center line and standard outer contour line of the fastener 3 on the standard graphic; then, collecting multiple sets of image information of the fastener 3 by the image acquisition device 4, and generating the actual center line and actual contour line of the fastener 3 in the image information; finally, comparing the obtained actual center line with the drawn standard center line to determine whether the coaxiality of the fastener 3 meets the requirements; and / or, comparing the obtained actual contour line with the drawn standard contour line to determine whether the roundness of the fastener 3 meets the requirements. The above detection process is only the collection of image information and data comparison of the fastener 3 at one angle. In the whole detection process, the fastener 3 needs to be rotated multiple times as in the above step S4, and the image information is collected and compared for each position of the fastener 3 in the circumferential direction, so as to obtain the overall detection data of the fastener 3, so as to determine whether the detection position of the fastener 3 meets the requirements as a whole.

[0111] Furthermore, before obtaining image information, the fastener 3 can be divided into multiple sections along the length direction of the fastener 3, and the diameter size of the fastener 3 at each dividing line position is obtained, and the obtained diameter size of the fastener 3 at each dividing line position is recorded in a table in sequence. The diameter size of the fastener 3 at each dividing line position can truly reflect the fluctuation amplitude and fluctuation amount of the diameter of the fastener 3 in the axial direction.

[0112] In another optional embodiment of the present invention, Figure 6 As shown, when the fastener 3 is a formed fastener with formed threads, the standard parameters and actual parameters include the major diameter size, the middle diameter size, the minor diameter size and / or the tooth shape size of the external thread.

[0113] The detection process includes: first, pre-drawing a standard graphic of the fastener 3 (the standard image can be drawn by existing image software), and at least determining the standard major diameter marking line, standard middle diameter marking line, standard minor diameter marking line and standard tooth shape size value of the fastener 3 on the standard graphic; then, collecting multiple groups of image information of the fastener 3 by the image acquisition device 4, and generating the actual major diameter marking line, actual middle diameter marking line, actual minor diameter marking line and actual tooth shape size value of the fastener 3 in the image information; finally, comparing the standard major diameter marking line with the actual major diameter marking line to determine whether the major diameter size of the fastener 3 meets the requirements; and / or, comparing the standard middle diameter marking line with the actual middle diameter marking line to determine whether the middle diameter size of the fastener 3 meets the requirements; and / or, comparing the standard minor diameter marking line with the actual minor diameter marking line to determine whether the minor diameter size of the fastener 3 meets the requirements; and / or, comparing the standard tooth shape size value with the actual tooth shape size value to determine whether the tooth shape size of the fastener 3 meets the requirements. The above detection process is only the collection of image information and data comparison of the fastener 3 at one angle. During the entire detection process, the fastener 3 needs to be rotated multiple times as in the above step S4, and image information is collected and compared for each circumferential position of the fastener 3 to obtain the overall detection data of the fastener 3, so as to determine whether the detection position of the fastener 3 meets the requirements as a whole.

[0114] The characteristics and advantages of the fastener detection method of the present invention are:

[0115] The fastener detection method can replace the detection method of manually rotating the fastener, reduce costs, improve detection efficiency, and improve the degree of automation and accuracy of detection.

[0116] In addition, the fastener detection method has the characteristics and advantages of the above-mentioned fastener detection system, which will not be repeated here.

[0117] It should be noted that, in the description of this application, the terms "first", "second", etc. are only used for descriptive purposes and to distinguish similar objects. There is no order of precedence between the two, and they cannot be understood as indicating or implying relative importance. In addition, in the description of this application, unless otherwise specified, the meaning of "plurality" is two or more.

[0118] The above-mentioned various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referenced to each other. Each embodiment focuses on the differences from other embodiments.

[0119] The above are only a few embodiments of the present invention. Although the embodiments disclosed by the present invention are as above, the contents are only embodiments adopted for facilitating the understanding of the present invention and are not used to limit the present invention. Any technician in the technical field to which the present invention belongs can make any modification and change in the form and details of the embodiments without departing from the spirit and scope disclosed by the present invention, but the patent protection scope of the present invention shall still be subject to the scope defined by the attached claims.

Claims

1. A fastener detection system, characterized in that: The fastener detection system comprises: A detection fixture, wherein the detection fixture comprises a first roller, a second roller and a third roller, wherein the third roller is movably arranged relative to the first roller and the second roller, and the spacing between the third roller and the first roller and the second roller is adjusted by moving the third roller, so as to clamp at least a part of the fastener between the first roller, the second roller and the third roller; A driving device, wherein an output end of the driving device is connected to the first roller or the second roller to drive the first roller or the second roller to rotate a preset angle; An image acquisition device, the image acquisition device is arranged toward the detection position of the fastener to acquire image information of the detection position of the fastener; A display, wherein a signal receiving end of the display is electrically connected to a signal output end of the image acquisition device to display the image information.

2. The fastener detection system according to claim 1, characterized in that: The detection fixture includes a shell having a accommodating cavity therein, and the shell has a mounting hole connected to the accommodating cavity. The first roller, the second roller and the third roller are all rotatably arranged in the accommodating cavity, and the positions between the first roller, the second roller and the third roller are opposite to the mounting hole, so that the detection position of the fastener clamped between the first roller, the second roller and the third roller extends from the mounting hole to the outside of the shell.

3. The fastener detection system according to claim 2, characterized in that: The detection fixture also includes a first rotating shaft, a second rotating shaft and a third rotating shaft arranged in parallel, the first rotating shaft, the second rotating shaft and the third rotating shaft are respectively located at the three vertices of a triangle and are respectively rotatably connected to the housing, the first roller, the second roller and the third roller are respectively arranged on the first rotating shaft, the second rotating shaft and the third rotating shaft, and the output end of the driving device is connected to the first rotating shaft or the second rotating shaft to drive the fastener to rotate the preset angle with the first roller or the second roller.

4. The fastener detection system according to claim 3, characterized in that: The shell also has a guide hole connected to the accommodating cavity, and the guide hole is a long hole. One end of the guide hole is connected to the mounting hole, and the other end of the guide hole extends away from the first roller and the second roller. The third rotating shaft can be movably embedded in the guide hole to adjust the distance between the third roller and the first roller and the second roller.

5. The fastener detection system according to claim 4, characterized in that: A limit bolt is arranged on the housing, the screw rod of the limit bolt extends into the accommodating cavity, and the third rotating shaft can abut against the screw rod of the limit bolt when the third rotating shaft moves along the guide hole; A return spring is sleeved on the screw rod of the limiting bolt, one end of the return spring is connected to the inner wall of the shell, and the other end of the return spring can be against the third rotating shaft.

6. The fastener detection system according to claim 4, characterized in that: A positioning plate is arranged outside the housing and on the same side as the detection position of the fastener. The end of the fastener can abut against the positioning plate, and the positioning plate is used to locate the position of the fastener.

7. The fastener detection system according to claim 6, characterized in that: The detection fixture also includes a long strip of position adjustment block, which is movably arranged on the shell along its length direction, and the positioning plate is connected to the position adjustment block. The position adjustment block is provided with a plurality of plug holes spaced apart along its length direction, and the shell is provided with a locking bolt, which is inserted into the plug hole corresponding to it to position the position adjustment block.

8. The fastener detection system according to any one of claims 2 to 7, characterized in that: The detection fixture also includes a bottom plate arranged in a horizontal direction, and the bottom of the shell is fixed to the top surface of the bottom plate.

9. The fastener detection system according to claim 2, characterized in that: The driving device is a driving motor.

10. The fastener detection system according to claim 1, characterized in that: The image acquisition device is an imager.

11. A fastener detection method, which uses the fastener detection system according to any one of claims 1 to 10 to detect the fastener, characterized in that: The fastener detection method comprises the following steps: Preset multiple sets of standard parameters of the detection position of the fastener in the circumferential direction; The fastener is mounted on a detection fixture, and the detection position of the fastener is aligned with an image acquisition device; Presetting a single rotation angle of the fastener; The fastener rotates multiple times in one direction according to the preset rotation angle, and the fastener stops rotating in a time period between two adjacent rotations. When the fastener stops rotating, the image acquisition device acquires images of the detection position of the fastener to obtain multiple sets of image information; Acquiring multiple groups of actual parameters of the fastener according to the multiple groups of image information; The multiple groups of actual parameters are compared with the corresponding multiple groups of standard parameters to determine whether the dimensional parameters of the detection position of the fastener meet the requirements.

12. The fastener detection method according to claim 11, characterized in that: After the image information is obtained, the image information is magnified.

13. The fastener detection method according to claim 11, characterized in that: The fasteners include a blank without threads and a formed fastener with threads formed; When the fastener is a blank without forming threads, the standard parameters and the actual parameters include the diameter, coaxiality and / or roundness of the detection position; When the fastener is a formed fastener with formed threads, the standard parameters and the actual parameters include the major diameter size, the middle diameter size, the minor diameter size and / or the thread shape size of the external thread.

14. The fastener detection method according to claim 13, characterized in that: When the fastener is a blank without forming threads, Pre-drawing a standard drawing of the fastener, and determining at least a standard center line and a standard outer contour line of the fastener on the standard drawing; The image acquisition device acquires a plurality of sets of image information of the fastener, and generates an actual center line and an actual contour line of the fastener from the image information; The actual center line is compared with the standard center line to determine whether the coaxiality of the fastener meets the requirements; and / or the actual contour line is compared with the standard contour line to determine whether the roundness of the fastener meets the requirements.

15. The fastener detection method according to claim 14, characterized in that: The fastener is divided into a plurality of sections along the length direction of the fastener, and the diameter size of the fastener at each dividing line position is obtained.

16. The fastener detection method according to claim 13, characterized in that: When the fastener is a threaded fastener, Pre-drawing a standard drawing of the fastener, and determining at least the standard major diameter marking line, the standard middle diameter marking line, the standard minor diameter marking line and the standard thread shape size value of the fastener on the standard drawing; The image acquisition device acquires a plurality of sets of image information of the fastener, and generates an actual major diameter marking line, an actual middle diameter marking line, an actual minor diameter marking line and an actual thread shape dimension value of the fastener from the image information; The standard major diameter marking is compared with the actual major diameter marking to determine whether the major diameter of the fastener meets the requirements; and / or, the standard middle diameter marking is compared with the actual middle diameter marking to determine whether the middle diameter of the fastener meets the requirements; and / or, the standard minor diameter marking is compared with the actual minor diameter marking to determine whether the minor diameter of the fastener meets the requirements; and / or, the standard tooth shape size value is compared with the actual tooth shape size value to determine whether the tooth shape size of the fastener meets the requirements.

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