A fastener detection apparatus and method based on laser measurement

Abstract

The application relates to the technical field of fastener quality inspection, and provides a fastener detection device and method based on laser measurement, which comprises a rack, an upper support is fixed on the rack, a U-shaped groove for bolt movement is formed in the upper support, a walking driving mechanism for driving the bolt to move horizontally is installed on the upper support, a walking plate is slidably connected to the walking driving mechanism through a threaded structure, and sliding sliding seats are symmetrically arranged on the walking plate. It can be understood that the laser transmission sensor and the arc-shaped detection block can automatically identify the internal and external thread defects of the bolt, the additional analysis equipment is not needed, the cost is low, and the precision is high. During the detection process, the walking driving mechanism drives the bolt to move, the defective bolt is marked and then falls into a first material box through the action of a double-shaft air cylinder, the qualified bolt enters a second material box, and automatic sorting is realized. Meanwhile, the equipment supports the simultaneous feeding and discharging, and the detection efficiency is effectively improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of fastener quality inspection, and more particularly, to a fastener detection device and method based on laser measurement. BACKGROUND

[0002] Fastener production generally includes raw material selection, cold upsetting forming, wire drawing (or thread rolling) forming, heat treatment and surface treatment processes. During production, the metal wire is cut and stamped into basic shapes such as bolts and nuts by a cold upsetting machine, then a thread structure is formed on the surface of the fastener using a wire drawing machine, followed by heat treatment to improve strength and hardness, and finally corrosion protection treatment such as galvanizing and phosphating to ensure that the fastener has good mechanical properties and durability.

[0003] Thread detection on the surface of the fastener is mainly used to check the precision and integrity of the thread. Detection can be performed using optical imaging, laser scanning or contact gauges, etc. to measure and compare the thread angle, pitch, outer diameter, intermediate diameter and surface defects. Automatic detection equipment can achieve online rapid detection, combined with image recognition algorithms or three-dimensional measurement systems, which can accurately identify thread burrs, broken teeth, misaligned teeth and other defects, ensuring the assembly reliability and consistency of each fastener.

[0004] The above-mentioned equipment has the following disadvantages:

[0005] 1. Optical imaging can be affected by light reflection, and a complete set of comparison and identification system is required after shooting, which has a high overall cost.

[0006] 2. The overall cost of the laser scanning equipment is also very high, requiring expensive scanners, data processing and analysis instruments, etc.

[0007] 3. The contact gauge method is low in efficiency and needs to be in direct contact with the thread surface, which can cause unnecessary wear and tear.

[0008] To solve the above problems, there is an urgent need for an equipment that can accurately detect the thread on the surface of the fastener, has low cost and high efficiency. SUMMARY

[0009] The present application aims to provide a fastener detection device and method based on laser measurement, which can accurately, non-contact and low-cost solve the problems in the prior art.

[0010] The purpose of the application can be realized by the following technical scheme: a fastener detection device based on laser measurement, comprising a rack, an upper support fixed on the rack, a U-shaped groove for bolt movement formed in the upper support, a walking driving mechanism for driving the bolt to move horizontally installed on the upper support, a walking plate slidably connected to the walking driving mechanism through a threaded structure, the walking plate being symmetrically provided with sliding sliding seats, a double-shaft air cylinder fixed on the sliding seat, an arc-shaped detection block fixed to the output end of the double-shaft air cylinder, two arc-shaped detection blocks abutting to form an internal thread sleeve structure for the bolt to be screwed into, and a laser emitter-receiver sensor fixed on each of the two arc-shaped detection blocks corresponding to the internal and external threads of the bolt, and a screw pushing mechanism fixed on one side of the rack for screwing the bolt between the two arc-shaped detection blocks.

[0011] A thread rib and a thread groove corresponding to the bolt are formed on the inner side of the arc-shaped detection block, and a detection port is further provided in the thread rib and the thread groove in the radial direction, and the laser emitter-receiver sensor is installed on the outer side of the arc-shaped detection block and corresponds to the detection port.

[0012] The laser emitter-receiver sensor comprises an emitter and a receiver, and the light of the emitter is incident on the thread surface and then refracted to the receiver.

[0013] Preferably, a guide groove is provided on the walking plate, a guide block is fixed to the bottom of the sliding seat and slidably matched with the guide groove, a driving pin is fixed to the bottom of the guide block, and a guide frame is fixed on the upper support and slidably matched with the driving pin.

[0014] Preferably, the guide frame comprises parallel and symmetric compression portions and flat portions, one end of the flat portion is connected with a guide portion, one end of the guide portion is fixed with a release portion, one end of the release portion is fixed with a stop head, and the compression portions and the flat portions are located directly above the screw pushing mechanism and the first bin, and the guide portion and the release portion are located directly above the second bin.

[0015] Preferably, the guide frame is provided with two symmetric guide frames corresponding to the two sliding seats respectively.

[0016] Preferably, the walking driving mechanism comprises symmetrically arranged screw rods, a threaded cylinder is fixed to the bottom of the walking plate and screwedly matched with the screw rods, and the two screw rods are linked through a transmission box, and a walking motor is arranged outside the transmission box to drive the screw rods.

[0017] Preferably, the screw pushing mechanism comprises a long air cylinder fixed to the rack through a side support plate and a lifting seat fixed to the output end of the long air cylinder, a rotating motor is fixed to the lifting seat, and a sleeve is fixed to the output end of the rotating motor.

[0018] Preferably, two positioning frames are formed in the rack to respectively place the first material box and the second material box, and the walking driving mechanism drives the bolt to move horizontally above the screw pushing mechanism, the first material box and the second material box.

[0019] Preferably, a detection hole is formed in the walking plate, and the two arc-shaped detection blocks are located above the detection hole.

[0020] Preferably, a vertical plate is fixed on the rack, an adapter plate is fixed on the vertical plate, and the upper end of the adapter plate is fixedly installed with the upper support.

[0021] The application also provides a fastener detection device based on laser measurement and a use method thereof.

[0022] S1, the bolt to be detected is placed in the sleeve, and the two arc-shaped detection blocks are combined to form an internal thread sleeve above the screw pushing mechanism through the walking driving mechanism and the double-shaft cylinder.

[0023] S2, the sleeve is rotated by the rotary motor, and the long cylinder drives the rotary motor to move upwards, so as to screw the bolt into the internal thread sleeve, at this time, the laser emitting and receiving sensor is in a reaction state, and the sensing signal is divided into two kinds, one is that the laser emitted by the transmitter is directly reflected to the receiver in the standard thread area, and the other is that when part of the thread is defective, the laser emitted by the transmitter cannot be reflected to the receiver.

[0024] S3, the bolt is completely screwed into the internal thread sleeve, which represents that the detection is completed, at this time, the rotary motor is stopped, the long cylinder is moved downwards, the bolt is retained between the two arc-shaped detection blocks, and the walking driving mechanism works to drive the bolt to move horizontally.

[0025] S4, when the bolt moves to above the first material box, the driving pin is still between the pressing part and the flattening part at this time, when the bolt is detected to be defective, the double-shaft cylinder will actively release the bolt at this position, and the defective bolt falls into the first material box.

[0026] S5, when the bolt is standard, the double-shaft cylinder does not work, and the walking driving mechanism directly moves the bolt to above the second material box, in the moving process, the driving pin slides to the outside of the release part through the guide part, the guide block slides in the guide groove, so as to drive the double-shaft cylinder and the arc-shaped detection block on the sliding seat to slide at the same time, at this time, the arc-shaped detection block is released, and the standard bolt is collected in the second material box.

[0027] The application has the following beneficial effects:

[0028] The application is used for bolt surface thread detection by setting two groups of arc-shaped detection blocks and laser transmission sensors, two groups of laser transmission sensors detect internal threads and external threads respectively, the detection method of the laser transmission sensor does not need contact and does not need additional analysis processing equipment, and only the function of the laser transmission sensor itself can realize thread surface detection, and has the advantages of low cost, high precision and the like;

[0029] The application can drive the detected bolt displacement under the driving of the walking driving mechanism, during the displacement process, the bolt marked with defects is collected in the first bin when moving above the first bin, the double-shaft air cylinder drives the arc-shaped detection block to separate from the bolt limit, so that the defective bolt is collected in the first bin; the standard bolt is not marked, the double-shaft air cylinder does not need to work, but under the cooperation of the walking driving mechanism, the guide frame and the driving pin, the standard bolt can be collected in the second bin.

[0030] In the bolt discharging process, the staff can place the bolt to be detected on the screw pushing mechanism again, so that the discharging and feeding are synchronized, and the detection efficiency is improved. BRIEF DESCRIPTION OF DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, for those skilled in the art, other drawings can also be obtained based on these drawings without any creative effort.

[0032] Figure 1 The structure schematic diagram of the pre-detection of the application is shown in the figure.

[0033] Figure 2 The structure schematic diagram of the screw pushing mechanism in the application is shown in the figure. Figure 1 The structure schematic diagram of the screw pushing mechanism in the application is shown in the figure.

[0034] Figure 3 The structure schematic diagram of the walking driving mechanism in the application is shown in the figure. Figure 2 The structure schematic diagram of the walking driving mechanism in the application is shown in the figure.

[0035] Figure 4 The structure schematic diagram of the walking driving mechanism in the application is shown in the figure. Figure 3 The structure schematic diagram of the walking driving mechanism in the application is shown in the figure.

[0036] Figure 5 The structure schematic diagram of the local split of the application is shown in the figure.

[0037] Figure 6 The structure schematic diagram of the split of the upper support, the walking driving mechanism and the walking plate is shown in the figure.

[0038] Figure 7 The structure schematic diagram of the split of the walking plate, the slide and the double-shaft air cylinder is shown in the figure.

[0039] Figure 8 Structure diagram of the main view half section of the two laser transmission sensors installed on the two arc-shaped detection blocks;

[0040] Figure 9 Structure diagram of the oblique section of the arc-shaped detection block;

[0041] Figure 10 Structure diagram of the cooperation of the guide frame and the driving pin;

[0042] Figure 11 Structure diagram of the guide frame;

[0043] In the drawings, the components represented by the respective reference numbers are listed as follows:

[0044] In the drawings:

[0045] 1, rack; 11, positioning frame; 12, first material box; 13, second material box; 14, vertical plate; 15, adapter plate; 16, side support plate;

[0046] 2, upper support; 21, U-shaped groove; 22, guide frame; 221, pressing part; 222, flattening part; 223, guide part; 224, releasing part; 225, stop head;

[0047] 3, walking driving mechanism; 31, screw rod; 32, transmission box; 33, walking motor;

[0048] 4, walking plate; 41, threaded cylinder; 42, detection hole; 43, guide groove;

[0049] 5, sliding seat; 51, guide block; 52, driving pin;

[0050] 6, double-shaft air cylinder;

[0051] 7, arc-shaped detection block; 71, threaded rib; 72, threaded groove; 73, detection port;

[0052] 8, laser transmission sensor; 81, transmitter; 82, receiver;

[0053] 9, screw pushing mechanism; 91, long air cylinder; 911, lifting seat; 92, rotary motor; 921, sleeve. DETAILED DESCRIPTION

[0054] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application is further described in detail below in combination with specific examples. It should be understood that the specific examples described herein are only used to explain the present application, and are not used to limit the present application. Based on the examples in the present application, all other examples obtained by those skilled in the art without making creative efforts fall within the scope of protection of the present application.

[0055] As shown in Figure 1 - Figure 11 The embodiment provides a fastener detection device based on laser measurement, which comprises a rack 1, an upper support 2 fixed on the rack 1, a U-shaped groove 21 formed in the upper support 2 for bolt movement, a walking driving mechanism 3 installed on the upper support 2 and used for driving the bolt to move horizontally, a walking plate 4 slidably connected to the walking driving mechanism 3 through a threaded structure, symmetrical sliding sliding seats 5 arranged on the walking plate 4, double-shaft air cylinders 6 fixed on the sliding seats 5, arc-shaped detection blocks 7 fixed to output ends of the double-shaft air cylinders 6, two arc-shaped detection blocks 7 being butted to form an internal thread sleeve structure for bolt rotation, laser emitting-receiving sensors 8 fixed on the two arc-shaped detection blocks 7 and corresponding to inner and outer threads of the bolt respectively, and a screw pushing mechanism 9 fixed on one side of the rack 1 and used for screwing the bolt into the two arc-shaped detection blocks 7.

[0056] Threaded ribs 71 and threaded grooves 72 corresponding to the bolt are formed on the inner side of the arc-shaped detection block 7, and a detection opening 73 is further formed in the threaded ribs 71 and the threaded grooves 72 along the radial direction, the laser emitting-receiving sensor 8 is installed on the outer side of the arc-shaped detection block 7 and corresponds to the detection opening 73, and the detection opening 73 forms a laser emitting-receiving sensor 8 and bolt surface thread cooperation channel.

[0057] The laser emitting-receiving sensor 8 comprises an emitter 81 and a receiver 82, light rays of the emitter 81 are irradiated on a threaded surface and then refracted to the receiver 82; in actual use, the emitting path of the emitter 81 and the receiving path of the receiver 82 are triangular, and the refraction point is the threaded surface of a standard bolt; when the threaded surface profile is standard, the screw rotates at this time, the refraction point is always unchanged, the screw of the bolt can scan the surface in a spiral manner, when the surface is complete, the laser of the emitter 81 can always be received by the receiver 82, so the bolt is a standard part; when the threaded surface has defects, the emitter 81 refraction path changes, the receiver 82 cannot receive the light rays, and whether there is a defect can be known through the induction of the laser emitting-receiving sensor 8.

[0058] Further, a guide groove 43 is formed on the walking plate 4, a guide block 51 is fixed to the bottom of the sliding seat 5 and slidably matched with the guide groove 43, a driving pin 52 is fixed to the bottom of the guide block 51, and a guide frame 22 slidably matched with the driving pin 52 is fixed to the upper support 2; the guide groove 43 and the guide block 51 in the embodiment are in a strip shape, so as to ensure stable sliding of the sliding seat 5 on the walking plate 4, the driving pin 52 is connected with the guide block 51 and has a non-circular (one-word, triangular, cross-shaped, rectangular, polygonal) plug connector, then is fixed through a bolt, the diameter of the driving pin 52 is greater than the width of the guide groove 43, so as to ensure stable sliding of the sliding seat 5 on the walking plate 4.

[0059] Further, the guide frame 22 includes a parallel symmetrical compression part 221 and a flat part 222, one end of the flat part 222 is connected with a guide part 223, one end of the guide part 223 is fixed with a release part 224, one end of the release part 224 is fixed with a stop head 225, the compression part 221 and the flat part 222 are located above the spiral pushing mechanism 9 and the first material box 12, the guide part 223 and the release part 224 are located above the second material box 13; the biaxial cylinder 6 drives the arc-shaped detection block 7 to be in the extended state during use, the two arc-shaped detection blocks 7 are connected to form an internal thread sleeve, at this time the compression part 221 is pressed against the rear end of the drive pin 52, so as to ensure the adhesion of the two arc-shaped detection blocks 7.

[0060] Further, the guide frame 22 is provided with two symmetrical slide seats 5 corresponding to the two slide blocks 5 respectively, and the two biaxial cylinders 6 and the arc-shaped detection blocks 7 are installed on the slide seats 5, so that the guide frame 22 can drive the two arc-shaped detection blocks 7 to open and close simultaneously under the sliding action of the drive pin 52 at the bottom of the slide seat 5.

[0061] Further, the walking driving mechanism 3 includes two symmetrical screw rods 31, the bottom of the walking plate 4 is fixed with a threaded barrel 41 which is screw-connected with the screw rod 31, the two screw rods 31 are connected through a transmission box 32, and the transmission box 32 is externally provided with a walking motor 33 for driving the screw rod 31; during use, the walking motor 33 is started to drive the two screw rods 31 to rotate synchronously through a conical gear set or a synchronous belt transmission, and the threaded barrel 41 drives the walking plate 4 and the upper end connecting piece thereof to translate on the upper support 2 through the screw connection with the screw rod 31.

[0062] Further, the spiral pushing mechanism 9 includes a long cylinder 91 fixed on the rack 1 through the side support plate 16 and a lifting seat 911 fixed on the output end of the long cylinder 91, the lifting seat 911 is fixed with a rotating motor 92, and the output end of the rotating motor 92 is fixed with a sleeve 921; the long cylinder 91 and the rotating motor 92 in the embodiment work simultaneously to drive the screw to rotate and move upward, so that the screw is screw-connected with the arc-shaped detection block 7, cooperates with the laser transmission sensor 8, and plays a role of scanning the surface of the screw in all directions, so that the thread surface of the screw can be fully detected.

[0063] Further, two positioning frames 11 are formed in the rack 1 to respectively place the first material box 12 and the second material box 13, and the walking driving mechanism 3 drives the screw to move horizontally above the spiral pushing mechanism 9, the first material box 12 and the second material box 13; the spiral pushing mechanism 9 in the embodiment drives the screw to perform spiral detection, the first material box 12 is used to collect defective screws, and the second material box 13 is used to collect standard screws.

[0064] Further, the walking plate 4 is provided with a detection hole 42 penetrating through, and the two arc-shaped detection blocks 7 are located above the detection hole 42, the detection hole 42 provides a spiral space for the screw and the arc-shaped detection block 7, and forms a falling space for the arc-shaped detection block 7 to collect after detection.

[0065] Further, the vertical plate 14 is fixed on the rack 1, the adapter plate 15 is fixed on the vertical plate 14, the upper end of the adapter plate 15 is fixedly installed with the upper support 2, the upper support 2 is stably installed on the rack 1 through the vertical plate 14 and the adapter plate 15, the vertical plate 14 is welded and fixed with the upper end of the positioning frame 11, and the adapter plate 15 is fixedly connected between the vertical plate 14 and the upper support 2.

[0066] It should be noted that the walking motor 33, the double-shaft air cylinder 6, the laser transmission sensor 8, the long air cylinder 91 and the rotating motor 92 in the embodiment can be connected with a controller (not shown) at the same time, and cooperation between them is realized through the controller.

[0067] The application further provides a fastener detection device based on laser measurement.

[0068] S1, the bolt to be detected is placed in the sleeve 921, and the two arc-shaped detection blocks 7 are combined to form an internal thread sleeve above the spiral pushing mechanism 9 through the walking driving mechanism 3 and the double-shaft air cylinder 6;

[0069] S2, the sleeve 921 is rotated by the rotating motor 92, and the long air cylinder 91 drives the rotating motor 92 to move upwards, so that the bolt is screwed into the internal thread sleeve, and the laser transmission sensor 8 is in a reaction state at this time, and the sensing signal is divided into two kinds, one is that the laser emitted by the emitter 81 is directly reflected to the receiver 82 in the standard thread area, and the other is that the laser emitted by the emitter 81 cannot be reflected to the receiver 82 when part of the thread is defective;

[0070] S3, the bolt is completely screwed into the internal thread sleeve, which represents that the detection is completed, at this time, the rotating motor 92 stops, the long air cylinder 91 moves downwards, and the bolt is retained between the two arc-shaped detection blocks 7, and the walking driving mechanism 3 drives the bolt to move horizontally;

[0071] S4, when the bolt moves to the position above the first bin 12, the driving pin 52 is still between the pressing part 221 and the flattening part 222 at this time, when the bolt is detected to be defective, the double-shaft air cylinder 6 at this position will actively release the bolt, and the defective bolt falls into the first bin 12;

[0072] S5, when the bolt is standard, the double-shaft air cylinder 6 does not work, and the bolt is directly moved to the position above the second bin 13 by the walking driving mechanism 3, in the moving process, the driving pin 52 slides to the outside of the release part 224 through the guide part 223, the guide block 51 slides in the guide groove 43, so that the double-shaft air cylinder 6 and the arc-shaped detection block 7 on the sliding seat 5 slide at the same time, at this time, the arc-shaped detection block 7 is released, and the standard bolt is collected in the second bin 13.

[0073] It can be understood that the application can automatically identify the internal and external thread defects of the bolt by the non-contact laser sensor cooperating with the arc-shaped detection block, without additional analysis equipment, and has low cost and high precision; during the detection process, the walking driving mechanism drives the bolt to move, the defective bolt is marked and then falls into the first material box by the action of the double-shaft cylinder, and the qualified bolt enters the second material box, so that automatic sorting is realized; meanwhile, the device supports the feeding and discharging to be synchronized, and the detection efficiency is effectively improved.

[0074] In the description of the application, unless otherwise specified, the meaning of "a plurality of" is two or more; it should be understood that the terms "opening", "upper", "lower", "thickness", "top", "middle", "length", "inner", "periphery" and the like indicate the orientation or positional relationship, and are only used to facilitate the description of the application and simplify the description, and do not indicate or imply that the components or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the application.

[0075] Finally, it should be pointed out that: the above only describes the preferred embodiments of the application, and is not used to limit the application, although the application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part of the technical features, any modification, equivalent replacement, improvement, etc. within the spirit and principles of the application should be included in the protection scope of the application.

Claims

1. A fastener detection apparatus based on laser measurement, comprising a frame (1), characterized in that: The frame (1) is fixed with an upper support (2), and the upper support (2) has a U-shaped groove (21) for bolt movement. The upper support (2) is equipped with a walking drive mechanism (3) that drives the bolt to move horizontally. The walking drive mechanism (3) is slidably connected to a walking plate (4) through a threaded structure. The walking plate (4) is symmetrically provided with sliding slides (5). The slides (5) are fixed with a dual-axis cylinder (6). The output end of the dual-axis cylinder (6) is fixed with an arc-shaped detection block (7). The two arc-shaped detection blocks (7) are joined to form an internal threaded sleeve structure for the bolt to be screwed in. Both arc-shaped detection blocks (7) are fixed with laser beam sensors (8), which correspond to the internal and external threads of the bolt respectively. A spiral pushing mechanism (9) that screws the bolt into the two arc-shaped detection blocks (7) is fixedly installed on one side of the frame (1). The inner side of the arc-shaped detection block (7) is formed with threaded ribs (71) and threaded grooves (72) corresponding to the bolts. Detection ports (73) are also provided radially in the threaded ribs (71) and threaded grooves (72). The laser beam sensor (8) is installed on the outer side of the arc-shaped detection block (7) and corresponds to the detection port (73). The laser beam sensor (8) includes a transmitter (81) and a receiver (82), wherein the light emitted by the transmitter (81) is irradiated on the threaded surface and then refracted to the receiver (82).

2. A fastener detection apparatus based on laser measurement according to claim 1, characterized in that: The walking plate (4) has a through guide groove (43), the bottom of the slide block (5) is fixed with a guide block (51) which slides in cooperation with the guide groove (43), the bottom of the guide block (51) is fixed with a drive pin (52), and the upper bracket (2) is fixed with a guide frame (22) that slides in contact with the drive pin (52).

3. A fastener detection apparatus based on laser measurement according to claim 2, characterized in that: The guide frame (22) includes a parallel and symmetrical pressing part (221) and a leveling part (222). One end of the leveling part (222) is connected to a guide part (223). One end of the guide part (223) is fixed with a release part (224). One end of the release part (224) is fixed with a stop (225). The pressing part (221) and the leveling part (222) are located directly above the spiral pushing mechanism (9) and the first material box (12). The guide part (223) and the release part (224) are located directly above the second material box (13).

4. A fastener detection apparatus based on laser measurement according to claim 2, characterized in that: The guide frame (22) is provided with two symmetrical sliding blocks (5) respectively.

5. The laser measurement based fastener detection apparatus of claim 1, wherein: The walking drive mechanism (3) includes symmetrically arranged screws (31). The bottom of the walking plate (4) is fixed with a threaded cylinder (41) that is screwed to the screws (31). The two screws (31) are linked together through a transmission box (32). The transmission box (32) is equipped with a walking motor (33) that drives the screws (31).

6. A fastener detection apparatus based on laser measurement according to claim 1, characterized in that: The spiral pushing mechanism (9) includes a long cylinder (91) fixed to the frame (1) by a side support plate (16) and a lifting seat (911) fixed to the output end of the long cylinder (91). A rotary motor (92) is fixed on the lifting seat (911), and a sleeve (921) is fixed to the output end of the rotary motor (92).

7. The laser measurement based fastener detection apparatus of claim 1, wherein: The rack (1) is formed with two positioning frames (11) respectively placing a first material box (12) and a second material box (13), and the walking driving mechanism (3) drives the bolt to move horizontally above the screw pushing mechanism (9), the first material box (12) and the second material box (13).

8. The laser measurement based fastener detection apparatus of claim 1, wherein: The walking plate (4) is provided with a through detection hole (42), and the two arc-shaped detection blocks (7) are located above the detection hole (42).

9. The laser measurement based fastener detection apparatus of claim 1, wherein: The rack (1) is fixed with a vertical plate (14), the vertical plate (14) is fixed with an adapter plate (15), and the upper end of the adapter plate (15) is fixedly installed with the upper support (2).

10. A method of using a laser-based fastener detection apparatus according to any one of claims 1-9, wherein, The method comprises the following steps: S1, the bolt to be detected is placed in the sleeve (921), and the two arc-shaped detection blocks (7) are combined to form an internal thread sleeve above the screw pushing mechanism (9) through the walking driving mechanism (3) and the double-shaft cylinder (6); S2, the sleeve (921) is rotated by the rotary motor (92), and the rotary motor (92) is moved upward by the long cylinder (91), so that the bolt is screwed into the internal thread sleeve, at this time, the laser emitting sensor (8) is in a reaction state, and the sensing signal is divided into two kinds, one is that the laser emitted by the emitter (81) is directly reflected to the receiver (82) in the standard thread area; the other is that when part of the thread is defective, the laser emitted by the emitter (81) cannot be reflected to the receiver (82); S3, the bolt is completely screwed into the internal thread sleeve, which represents that the detection is completed, at this time, the rotary motor (92) is stopped, the long cylinder (91) is moved downward, the bolt is retained between the two arc-shaped detection blocks (7), and the walking driving mechanism (3) works to drive the bolt to move horizontally; S4, when the bolt moves to above the first material box (12), the driving pin (52) is still between the pressing part (221) and the flat part (222) at this time, when the bolt is detected to be defective, the double-shaft cylinder (6) will actively release the bolt at this position, and the defective bolt falls into the first material box (12); S5, when the bolt is standard, the double-shaft cylinder (6) does not work, and the bolt is directly moved to above the second material box (13) by the walking driving mechanism (3), in the moving process, the driving pin (52) slides to the outside of the release part (224) through the guide part (223), the guide block (51) slides in the guide groove (43), so as to drive the double-shaft cylinder (6) and the arc-shaped detection block (7) on the sliding seat (5) to slide at the same time, at this time, the arc-shaped detection block (7) is released, and the standard bolt is collected in the second material box (13).

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