Bolt thread defect automatic detection equipment and method

Abstract

The invention relates to the technical field of thread visual inspection, and provides an automatic bolt thread defect detection device and method.The detection device comprises a machine box and further comprises a feeding mechanism installed on the machine box, and after being placed, bolts are sequentially conveyed to a detection station and a discharging station through rotation of the feeding mechanism; the feeding mechanism comprises a rotating base fixed to the machine box and a rotating disc rotationally arranged on the rotating base and used for placing bolts. It can be understood that through driving cooperation of the positioning mechanism and the feeding mechanism, automatic loosening of the bolts at the feeding and discharging station and automatic clamping of the bolts at the detection station are achieved, feeding and discharging are facilitated, and the situation that vibration influences the shooting definition can be avoided; meanwhile, the rotating mechanism is used for driving the multiple cameras to rotate synchronously, so that the single camera can complete all-directional thread shooting of the bolt, and the cost is reduced while the detection comprehensiveness is guaranteed; in addition, the rejecting mechanism can directly reject unqualified bolts, the clamping state does not need to be relieved, and the overall structure is efficient in cooperation, simple and easy to operate.

Description

Technical Field

[0001] The present invention relates to the field of thread vision detection, and more specifically, to an automatic detection device and method for bolt thread defects. Background Art

[0002] The detection of bolt thread defects is an important link to ensure the reliability and safety of fasteners. Appropriate detection methods need to be selected according to factors such as application scenarios, precision requirements, and costs; thread defects mainly include cracks, wear, deformation, tooth missing, and thread disorder. Cracks are usually caused by stress concentration or material fatigue, which may pose a risk of fracture; wear will cause the loosening of thread fit; deformation and tooth missing are mostly caused by improper processing; thread disorder is manifested as thread misalignment or irregular tooth profile. These defects will directly affect the connection strength and sealing performance of bolts, and unqualified products need to be removed in time through detection; The existing detection methods include manual visual inspection and machine vision inspection. Manual visual inspection relies on operators to use magnifying glasses or thread go-no-go gauges for judgment. It has low cost but limited efficiency, and is suitable for small-batch or temporary detection scenarios, but has a low detection rate for tiny defects (such as micro-cracks); Machine vision inspection collects thread images through a high-resolution industrial camera, and analyzes defects by combining edge detection algorithms (such as Canny) or deep learning models (such as YOLOv5). An annular light source needs to be configured to reduce the interference of reflection. The detection speed can reach hundreds of pieces per minute, which is suitable for automated production lines. However, the algorithm needs to be trained for different thread specifications, and the initial data annotation cost is relatively high; in the existing automated thread vision detection equipment, bolts are fed by a bolt vibrating feeder. The feeder places the bolts on the detection table and transports them to the vision detection area. Cameras at multiple angles take pictures, and then it is determined whether they are qualified through the image information. Unqualified products will be marked and then separated; However, the procurement cost of automated vision detection equipment is too high for the initial cost of small-batch manufacturers, while the efficiency and reliability of manual visual inspection are relatively low. At the same time, after the bolts are placed on the automated vision detection equipment, there is a lack of positioning. The operation of equipment such as detection equipment and feeders will generate certain vibrations. Without positioning, the bolts will produce errors during shooting, easily resulting in double images and blurring, affecting the image judgment efficiency and accuracy; and after vision detection, an additional blanking mechanism is required to distinguish qualified and unqualified products, and the overall investment in equipment is relatively large; To solve the above problems, an automatic detection device and method for bolt thread defects are proposed in this application. Summary of the Invention

[0003] The purpose of the present invention is to provide an automatic detection device and method for bolt thread defects to solve the problems in the prior art.

[0004] The purpose of the present invention can be achieved through the following technical solutions: An automatic detection device for bolt thread defects, including a chassis, further comprising: A feeding mechanism installed on the chassis. After the bolts are placed, they are sequentially conveyed to the detection station and the blanking station through the rotation of the feeding mechanism. The feeding mechanism includes a rotating seat fixed on the chassis and a turntable rotatably arranged on the rotating seat and used for placing bolts. The rotating seat is fixed to the chassis through a bracket. The rotation between the turntable and the rotating seat adopts a ball connection. The balls are located on the side where the two contact, providing clearance for the blanking of the bolts. A positioning mechanism installed between the rotating seat and the turntable. The positioning mechanism automatically clamps or loosens the bolts through the rotation of the turntable on the rotating seat. The positioning mechanism is divided into two parts. One part is synchronized with the rotation of the turntable, and the other part is fixed on the rotating seat. This part is located below the detection station. When the two parts cooperate, the bolts are in a clamped state, ensuring the stability of the bolts during detection. A support extending upward from the middle of the feeding mechanism and fixed to the upper end of the chassis. A rotating mechanism for driving the camera to rotate is provided on the support. There are multiple detection stations in the rotating mechanism, and a camera is installed at each station. Through the rotation of the rotating mechanism, the camera is driven to photograph the external thread of the bolt. In order to improve the brightness of the shooting environment, a light source can be installed on the camera to provide supplementary lighting. An ejection mechanism arranged between the support and the feeding mechanism. The ejection mechanism can take out the bolts at the detection station. The ejection mechanism disengages the bolts from the positioning mechanism in the pressed state from top to bottom. A control panel fixed to the top of the chassis and located in the middle of the feeding mechanism. An industrial control computer electrically connected to the control panel is installed inside the chassis.

[0005] The feeding mechanism further includes a toothed ring arranged on the inner ring of the turntable. A feeding motor is installed inside the rotating seat through a bracket. A feeding gear meshing with the toothed ring is fixed to the output end of the feeding motor. The connection relationship between the feeding gear and the feeding motor can provide sufficient space for the installation of the support and the control panel while ensuring reliable power transmission, making the equipment structure more compact.

[0006] The positioning mechanism includes a part slot penetrating through the turntable and through holes opened on the inner and outer sides of the part slot. The width of the part slot is slightly larger than the minimum diameter of the bolt end cap and slightly smaller than the maximum diameter of the end cap, serving the purpose of preventing misoperation during placement and facilitating placement. The through holes are opened radially. Symmetrically sliding clamping plates are provided in the part slot. One end of the two clamping plates close to each other is V-shaped. One end of the clamping plate is fixed with a driving rod sliding in the through hole. The end of the driving rod away from the clamping plate extends out of the outside of the part slot. A return spring sleeved on the outside of the driving rod and abutting against each other is provided between the clamping plate and the inner side of the part slot.

[0007] The positioning mechanism further includes an inner driving plate and an outer driving plate that squeeze the driving rod from the inner and outer sides. The contact ends of the driving rod with the inner driving plate and the outer driving plate are point contacts. In order to reduce friction, lubricating oil can also be applied at the connection. The inner driving plate and the outer driving plate are located directly below the detection station and are used to clamp the bolt in the detection state. A guiding plate is fixed at one end close to the entry of the bolt, and the guiding plate is used for guiding the driving rod into the driving plate. The inner driving plate and the outer driving plate are fixedly installed on the rotating seat through a connecting frame.

[0008] The rotating mechanism includes a plurality of circular rings rotatably installed on the support. The circular rings are located directly above the conveying path of the turntable. The camera is fixed inside the circular ring in an inclined state and the shooting end faces the threaded part of the bolt. Rotating settings enable a single camera to achieve full-round shooting of the thread, ensuring the shooting effect while controlling costs. The camera transmits images through an electric slip ring.

[0009] The rotating mechanism further includes a rotating gear provided on the support. Tooth grooves are formed on the outside of the plurality of circular rings and are engaged with the rotating gear. The rotating gear and the circular rings are synchronously driven through the tooth grooves and a synchronous belt. A rotating motor for driving the rotating gear is fixed on the top of the support. The synchronous belt can drive a plurality of circular rings to rotate synchronously at the same time, realizing the synchronous rotation of a plurality of cameras, so that a plurality of bolts can be detected simultaneously.

[0010] The rejection mechanism includes a blanking box located directly below the detection station and fixed to the bottom of the rotating seat. A first blanking hole communicating with the blanking box is formed through the rotating seat. The upper end of the blanking box covers a plurality of first blanking holes at the same time, and the lower end is open. A pushing cylinder is fixed on the top of the support. The output end of the pushing cylinder faces downward and is fixed with a push rod passing through the support. The push rod is coaxial with the bolt in the detection state, and the push rod is also concentric with the first blanking hole. The diameter of the push rod is smaller than the diameter of the bolt to avoid being clamped by the positioning mechanism when pushing down.

[0011] A blanking groove is fixed to the bottom of the rotating seat. The position where the feeding mechanism is installed in the blanking groove is the blanking station. A second blanking hole communicating with the blanking groove is formed through the rotating seat. When the part groove conveys the bolt above the blanking groove, it can be automatically blanked through the second blanking hole.

[0012] The object of the present invention can also be achieved by the following technical solution: An automatic detection method for bolt thread defects. According to the above-mentioned automatic detection equipment for bolt thread defects, the steps of the detection method are as follows: S1. Place the bolt on the inner side of the part groove and at the upper end of the rotating seat from the loading station. The bolt end cap is located between the two clamping plates; S2. Start the feeding motor through the operation button on the control panel to drive the feeding gear to engage with the gear ring. The gear ring drives the turntable to rotate on the rotating seat, and at the same time drives the screw to move. The driving rods on the inner and outer sides contact the inner driving plate and the outer driving plate at the same time, and the return spring is stretched. The two clamping plates apply pressure at the same time to clamp the bolt. As the feeding mechanism conveys, the bolt is rotated into the detection station. At this time, the bolt is directly above the first blanking hole; S3. Start the rotating motor to drive the circular ring and the camera to rotate on the support through the rotating gear and the synchronous belt. The single rotation angle of the rotating motor enables the camera to take pictures of the bolt from multiple angles, and then transmits the data to the industrial control computer; S401. When the industrial control computer detects that the bolt is unqualified, start the pushing cylinder to drive the push rod to move down, separate the unqualified bolt from the lower end of the positioning mechanism and pass through the first blanking hole into the blanking box, and collect it through the basket placed at the outlet of the blanking box. Then the pushing cylinder drives the push rod to move up and reset; S402. When the bolt is detected to be qualified, it is continuously conveyed through the feeding mechanism. The driving rod is separated from the inner driving plate and the outer driving plate. Under the action of the return spring, the bolt is loosened. When the feeding mechanism moves the bolt to the second blanking hole, it is discharged through the blanking groove; The detection method in the above technical solution has the advantages of low cost and high efficiency. At the same time, the bolt can be stably clamped during the detection process to ensure the shooting clarity.

[0013] In step 3, when the camera 6 takes a single shot of the thread, it rotates one circle. The rotation of the camera 6 by one circle ensures the complete acquisition of the thread. The camera 6 is a high-resolution industrial camera.

[0014] Advantages of the present invention: Through the driving cooperation between the positioning mechanism and the feeding mechanism provided by the present invention, the positioning mechanism automatically loosens the bolt at the loading and unloading stations and automatically clamps it at the detection station. The automatic loosening facilitates loading and unloading, and the automatic clamping prevents the bolt from shaking due to equipment vibration, thus ensuring the shooting clarity; By installing the camera on the rotating mechanism, the rotating mechanism can drive multiple cameras to rotate at the same time, realizing the simultaneous detection of multiple bolts. And when each bolt is detected, only one camera is needed to achieve the shooting of the full-range thread, ensuring full shooting while reducing the cost of multiple cameras; The rejection mechanism provided by the present invention can directly reject the bolt when it is detected to be unqualified, without separately disengaging the positioning mechanism from the clamping, and has the advantages of high structural cooperation, simple structure and convenient operation. Description of the drawings

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required in the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0016] Figure 1 is a schematic structural diagram of the present invention; Figure 2 is Figure 1 a schematic structural diagram of the rear side in a perspective view from below; Figure 3 is a schematic front view structural diagram of the present invention; Figure 4 is a schematic structural diagram of the bracket and its connecting parts in a perspective view from below; Figure 5 is a schematic structural diagram of the feeding mechanism and its connecting parts with partial disassembly; Figure 6 is a schematic structural diagram of the partial disassembly at the connection between the positioning mechanism and the turntable; Figure 7 is a schematic structural diagram of the connection part between the positioning mechanism and the rotating seat; Figure 8 is a schematic structural diagram of the interior of the chassis; In the drawings, the list of components represented by each reference numeral is as follows: In the figure: 1, chassis; 2, feeding mechanism; 21, rotating seat; 22, turntable; 23, gear ring; 24, feeding gear; 25, feeding motor; 3, positioning mechanism; 31, part slot; 32, through hole; 33, clamping plate; 34, driving rod; 35, return spring; 36, inner driving plate; 37, outer driving plate; 38, guiding plate; 39, connecting frame; 4, support; 5, rotating mechanism; 51, circular ring; 52, rotating gear; 53, synchronous belt; 54, rotating motor; 6, camera; 7, rejection mechanism; 71, first blanking hole; 72, blanking box; 73, pushing cylinder; 74, push rod; 8, blanking groove; 81, second blanking hole; 9, control panel; 10, industrial control computer. Detailed Embodiments

[0017] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the following will further elaborate on the present invention in combination with specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0018] Such as Figure 1 - Figure 8As shown in the figure: This embodiment provides an automatic detection device for bolt thread defects, including a chassis 1, and further including: a feeding mechanism 2, which successively forms a feeding station, a detection station, and a discharging station in the counterclockwise direction. Bolts are placed on the feeding mechanism 2 at the feeding station. When the feeding mechanism 2 moves the bolts to the detection station, the positioning mechanism 3 automatically clamps the bolts. Subsequently, the rotating mechanism 5 drives the camera 6 to rotate to detect the bolts. Unqualified bolts are first removed by the rejection mechanism 7, and qualified bolts are continuously conveyed by the feeding mechanism 2. Subsequently, the positioning mechanism 3 automatically releases the pressing on the bolts and automatically discharges them when moving to the discharging chute 8; the control panel 9 is fixed on the top of the chassis 1 and is located in the middle of the feeding mechanism 2. An industrial control computer 10 electrically connected to the control panel 9 is installed inside the chassis 1. The camera 6 is also electrically connected to the industrial control computer 10. The camera 6 is the core component for image acquisition and is responsible for obtaining high-quality thread images. When the bolts are conveyed to the detection station, the control panel uses a PLC to sense the arrival of the bolts through a photoelectric sensor and then sends a trigger signal to the camera 6; after receiving the trigger signal, the camera 6 takes a photo and transmits the image data to the industrial control computer through a high-speed interface. The industrial control computer is the intelligent processing center of the system and runs professional image processing software and algorithms; after receiving the images transmitted by the camera, the industrial control computer immediately starts a preset detection program, which may include edge detection algorithms to identify thread contours, template matching techniques to check tooth profile standards, or deep learning models to classify defect types.

[0019] As an implementation manner of the present invention, the feeding mechanism 2 is installed on the chassis 1. After the bolts are placed at the feeding station, they are successively conveyed to the detection station and the discharging station through the rotation of the feeding mechanism 2. The feeding mechanism 2 includes a rotating seat 21 fixed on the chassis 1 and a turntable 22 rotatably arranged on the rotating seat 21 and used for placing bolts. The feeding mechanism 2 further includes a toothed ring 23 arranged on the inner ring of the turntable 22. A feeding motor 25 is installed inside the rotating seat 21 through a bracket. A feeding gear 24 meshing with the toothed ring 23 is fixed at the output end of the feeding motor 25. Specifically, the output of the feeding motor 25 drives the feeding gear 24 to mesh with the toothed ring 23, driving the turntable 22 to rotate on the rotating seat 21, and the rotating turntable 22 drives the bolts to rotate synchronously.

[0020] As an implementation manner of the present invention, the positioning mechanism 3 is installed between the rotating base 21 and the turntable 22. The positioning mechanism 3 automatically clamps or loosens the bolt through the rotation of the turntable 22 on the rotating base 21. The positioning mechanism 3 includes a part groove 31 penetrating through the turntable 22 and through holes 32 opened on the inner and outer sides of the part groove 31. Symmetrically sliding clamping plates 33 are arranged in the part groove 31. A driving rod 34 sliding in the through hole 32 is fixed at one end of the clamping plate 33. A return spring 35 sleeved on the outside of the driving rod 34 and abutting against each other is arranged between the clamping plate 33 and the inner side of the part groove 31. The positioning mechanism 3 further includes an inner driving plate 36 and an outer driving plate 37 that squeeze the driving rod 34 from the inner and outer sides. The inner driving plate 36 and the outer driving plate 37 are located directly below the detection station, and a guiding plate 38 is fixed at one end close to the entry of the bolt. The inner driving plate 36 and the outer driving plate 37 are fixedly installed on the rotating base 21 through a connecting frame 39. Specifically, when the driving rod 34 is not squeezed by the inner driving plate 36 and the outer driving plate 37, the return spring 35 drives the clamping plate 33 to move outward to disengage from clamping the bolt. When the driving rod 34 contacts the inner driving plate 36 and the outer driving plate 37, the driving rod 34 and the clamping plate 33 squeeze inward to clamp the bolt. At this time, the return spring 35 is in a stretched state. The driving rod 34 in this clamped state can still move on the inner driving plate 36 and the outer driving plate 37 to convey the bolt in a clamped state.

[0021] As an implementation manner of the present invention, the support 4 extends upward from the middle of the feeding mechanism 2 and is fixed to the upper end of the chassis 1. A rotating mechanism 5 for driving the camera 6 to rotate is arranged on the support 4. The rotating mechanism 5 includes a plurality of circular rings 51 rotatably installed on the support 4. The circular rings 51 are located directly above the conveying path of the turntable 22. The camera 6 is fixed inside the circular ring 51 in an inclined state and the shooting end faces the threaded part of the bolt. After each single shooting by the camera 6, it avoids the conveying path of the bolt through the rotating mechanism 5. There are multiple detection stations in the rotating mechanism 5, and a camera 6 is installed at each station. The rotation of the rotating mechanism 5 drives the camera 6 to photograph along the external thread of the bolt. The rotating mechanism 5 further includes a rotating gear 52 arranged on the support 4. Tooth grooves cooperating with the rotating gear 52 are formed on the outside of the plurality of circular rings 51. The rotating gear 52 and the circular rings 51 are synchronously driven through the tooth grooves and a synchronous belt 53. A rotating motor 54 for driving the rotating gear 52 is fixed to the top of the support 4. Specifically, the rotating motor 54 drives the rotating gear 52 to engage with the synchronous belt 53. The synchronous belt 53 drives the plurality of circular rings 51 to rotate synchronously through engagement. The circular rings 51 then drive the camera 6 inside to rotate. The rotation of the camera 6 can be carried out in multiple times. After each rotation of a certain angle, the rotating motor 54 stops. At this time, the camera 6 takes a picture, and the rotating motor 54 continues to work, so as to collect the threads from multiple positions in the circumferential direction.

[0022] As an implementation manner of the present invention, the rejection mechanism 7 is arranged between the support 4 and the feeding mechanism 2. The rejection mechanism 7 can take out the bolts at the detection station. The rejection mechanism 7 disengages the bolts from the positioning mechanism 3 in the pressed state from top to bottom. The rejection mechanism 7 includes a blanking box 72 located directly below the detection station and fixed to the bottom of the rotating seat 21. A first blanking hole 71 communicating with the blanking box 72 is formed through the rotating seat 21. A pushing cylinder 73 is fixed to the top of the support 4. The output end of the pushing cylinder 73 faces downward and is fixed with a push rod 74 penetrating through the support 4. The push rod 74 is coaxial with the bolts in the detection state, and the push rod 74 is also concentric with the first blanking hole 71. Specifically, when the industrial control computer 10 detects that the corresponding bolts are unqualified, the pushing cylinder 73 is started to drive the push rod 74 to move downward. The push rod 74 further pushes the bolts in the clamped state downward and then enters the blanking box 72 through the first blanking hole 71, and is collected by the basket at the opening of the blanking box 72.

[0023] A blanking groove 8 is fixed to the bottom of the rotating seat 21. The position where the feeding mechanism 2 is installed on the blanking groove 8 is the blanking station. A second blanking hole 81 communicating with the blanking groove 8 is formed through the rotating seat 21. When the bolt moves above the blanking groove 8, the positioning mechanism 3 is in the loosened state. When the part groove 31 coincides with the second blanking hole 81, the bolt automatically discharges through the blanking groove 8 and is collected by the basket placed below the blanking groove 8.

[0024] This embodiment also provides: an automatic detection method for bolt thread defects. According to the above automatic detection equipment for bolt thread defects, the steps of the detection method are as follows: S1. Place the bolts on the inner side of the part groove 31 and at the upper end of the rotating seat 21 from the loading station, and the bolt end caps are located between the two clamping plates 33; S2. Start the feeding motor 25 through the operation button on the control panel 9 to drive the feeding gear 24 to mesh with the toothed ring 23. The toothed ring 23 drives the turntable 22 to rotate on the rotating seat 21, and at the same time drives the spiral movement. The driving rods 34 on the inner and outer sides are simultaneously in contact with the inner driving plate 36 and the outer driving plate 37, and the return spring 35 is stretched. The two clamping plates 33 simultaneously apply pressure to clamp the bolts. As the feeding mechanism 2 conveys, the bolts are rotated into the detection station, and at this time the bolts are directly above the first blanking hole 71; S3. Start the rotating motor 54 to drive the circular ring 51 and the camera 6 to rotate on the support 4 through the rotating gear 52 and the synchronous belt 53. The camera 6 takes pictures of the bolts from multiple angles through the single rotation angle of the rotating motor 54. The camera 6 rotates one circle when taking pictures of the bolts each time to ensure that the entire thread of the bolts is completely collected, and then transmits the data to the industrial control computer 10; S401. When the industrial control computer 10 detects that the bolt is unqualified, start the pushing cylinder 73 to drive the push rod 74 to move downward, separate the unqualified bolt from the lower end of the positioning mechanism 3 and pass through the first blanking hole 71 into the blanking box 72, and collect it through the basket placed at the outlet of the blanking box 72. Subsequently, the pushing cylinder 73 drives the push rod 74 to move upward and reset. S402. When the bolt is detected to be qualified, it is continuously conveyed by the feeding mechanism 2. The driving rod 34 is separated from the inner driving plate 36 and the outer driving plate 37, and the bolt is released under the action of the return spring 35. When the feeding mechanism 2 moves the bolt to the second blanking hole 81, it is discharged through the blanking groove 8.

[0025] It can be understood that through the driving cooperation between the positioning mechanism and the feeding mechanism of the present invention, the bolt is automatically loosened at the loading and unloading station and automatically clamped at the detection station, which is convenient for loading and unloading and can avoid the vibration from affecting the shooting clarity. At the same time, the rotating mechanism drives multiple cameras to rotate synchronously, enabling a single camera to complete the all-round thread shooting of the bolt, reducing the cost while ensuring the comprehensiveness of detection. In addition, the rejection mechanism can directly reject unqualified bolts without releasing the clamping state, and the overall structure is efficiently coordinated and simple to operate.

[0026] In the description of the present invention, unless otherwise specified, the meaning of "a plurality of" is two or more. It should be understood that the terms "open hole", "upper", "lower", "thickness", "top", "middle", "length", "inner", "periphery", etc. indicating the orientation or position relationship are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the components or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the present invention.

[0027] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An automatic detection device for bolt thread defects, comprising a chassis, characterized in that: Also includes: A feeding mechanism installed on the chassis, after the bolts are placed, is transported to the inspection station and the unloading station in sequence through the rotation of the feeding mechanism, the feeding mechanism comprising a rotating seat fixed on the chassis and a turntable rotatably arranged on the rotating seat and used to place the bolts; A positioning mechanism installed between the rotating seat and the rotating disk, wherein the positioning mechanism automatically tightens or loosens the bolts by the rotation of the rotating disk on the rotating seat; A support extending upward from the middle of the feeding mechanism and fixed to the upper end of the chassis, the support is provided with a rotating mechanism for driving the camera to rotate, the rotating mechanism has a plurality of inspection stations, each station is equipped with a camera, and the rotation of the rotating mechanism drives the camera to shoot along the outer thread of the bolt; A rejecting mechanism is arranged between the support and the feeding mechanism, and the rejecting mechanism can take out the bolt at the detection station, and the rejecting mechanism disengages the bolt from the positioning mechanism in a compressed state from top to bottom; A control panel is fixed on the top of the chassis and located in the middle of the feeding mechanism, and an industrial computer electrically connected to the control panel is installed inside the chassis.

2. The automatic detection device for bolt thread defects according to claim 1 is characterized in that: The feeding mechanism also includes a gear ring arranged on the inner ring of the turntable, a feeding motor is installed on the inner side of the rotating seat through a bracket, and a feeding gear () meshing with the gear ring is fixed at the output end of the feeding motor.

3. The automatic detection device for bolt thread defects according to claim 1 is characterized in that: The positioning mechanism includes a parts slot that passes through the turntable and through holes that are provided inside and outside the parts slot. A symmetrical sliding clamp is provided in the parts slot, and a driving rod that slides in the through hole is fixed to one end of the clamp. A return spring that is sleeved on the outside of the driving rod and presses against each other is provided between the clamp and the inner side of the parts slot.

4. The automatic detection device for bolt thread defects according to claim 3 is characterized in that: The positioning mechanism also includes an inner drive plate and an outer drive plate that squeeze the drive rod from the inside and outside. The inner drive plate and the outer drive plate are located directly below the detection station, and a guide plate is fixed to the end close to the bolt entry. The inner drive plate and the outer drive plate are fixedly installed on the rotating seat through a connecting frame.

5. The automatic detection device for bolt thread defects according to claim 1 is characterized in that: The rotating mechanism includes a plurality of circular rings rotatably mounted on a support, wherein the circular rings are located directly above the turntable conveying path, and the camera is fixed inside the circular rings in an inclined state with the shooting end facing the threaded portion of the bolt.

6. The automatic detection device for bolt thread defects according to claim 5 is characterized in that: The rotating mechanism also includes a rotating gear arranged on a support, and multiple circular rings are formed with tooth grooves that cooperate with the rotating gears on the outside. The rotating gears and the circular rings are synchronously transmitted through the tooth grooves and a synchronous belt. A rotating motor that drives the rotating gears is fixed on the top of the support.

7. The automatic detection device for bolt thread defects according to claim 1 is characterized in that: The rejection mechanism includes a material discharge box located directly below the detection station and fixed to the bottom of the rotating seat, a first material discharge hole communicating with the material discharge box is opened through the rotating seat, a pushing cylinder is fixed to the top of the support, the output end of the pushing cylinder is downward and a push rod is fixed that passes through the support, the push rod is coaxial with the bolt in the detection state, and the push rod is also cocentric with the first material discharge hole.

8. The automatic detection device for bolt thread defects according to claim 1 is characterized by: A material discharge trough is fixed at the bottom of the rotating seat, and the position where the material discharge trough is installed in the feeding mechanism is the material discharge station. A second material discharge hole communicating with the material discharge trough is opened through the rotating seat.

9. A method for automatically detecting bolt thread defects, according to the automatic detection device for bolt thread defects according to any one of claims 1 to 8, characterized in that: The detection method steps are as follows: S1. Place the bolts on the inner side of the parts slot and on the upper end of the rotating seat from the loading station, with the bolt caps located between the two clamping plates; S2. Start the feeding motor through the operation button on the control panel to drive the feeding gear to mesh with the gear ring. The gear ring drives the turntable to rotate on the rotating seat and drives the spiral to move. The inner and outer driving rods are in contact with the inner drive plate and the outer drive plate at the same time. The return spring is stretched, and the two clamping plates apply pressure to clamp the bolt at the same time. With the conveying of the feeding mechanism, the bolt is rotated to the detection station. At this time, the bolt is located directly above the first feeding hole. S3, start the rotating motor to drive the circular ring and the camera to rotate on the support through the rotating gear and the synchronous belt, use the camera to shoot the bolts from multiple angles through the single rotation angle of the rotating motor, and then transmit the data to the industrial computer; S401, when the industrial computer detects that the bolt is unqualified, the push cylinder is started to drive the push rod to move downward, so that the unqualified bolt is separated from the lower end of the positioning mechanism and passes through the first discharge hole into the discharge box, and is collected by a basket placed at the discharge box outlet, and then the push cylinder drives the push rod to move upward and reset; S402, when the bolts are qualified after inspection, they are continuously conveyed by the feeding mechanism, the driving rod is out of contact with the inner driving plate and the outer driving plate, the bolts are loosened under the action of the return spring, and when the feeding mechanism moves the bolts to the second discharge hole, they are discharged through the discharge chute.

10. The method for automatically detecting bolt thread defects according to claim 9, characterized in that: In step 3, the camera rotates one circle when taking a single shot of the bolt.

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