Round needle straightness detection device based on machine vision

Abstract

The utility model discloses a round needle straightness detection device based on machine vision, which comprises a rack, a detection turntable, a visual detection mechanism and a feeding mechanism, the detection turntable is rotatably arranged on the rack, and the feeding mechanism and the visual detection mechanism are circumferentially arranged on the rack around the detection turntable and are positioned above the detection turntable; during detection, the feeding mechanism conveys the round needles to the detection rotating disc, the detection rotating disc rotates to drive the round needles to the position below the visual detection mechanism, and then the round needles are shot and detected through the visual detection mechanism. The round needle straightness detection device has the advantages that automatic detection of round needle straightness can be achieved, detection efficiency is improved, detection precision is high based on machine vision detection, and product quality is effectively guaranteed.

Description

Technical Field

[0001] The utility model relates to a straightness detection device, and more specifically to a round needle straightness detection device based on machine vision. Background Art

[0002] Plastic spectacle temple wires often need to be inserted into metal (copper or stainless steel) round needles to increase strength or facilitate shape adjustment. To ensure that the round needle maintains a linear trajectory when inserted into the plastic part, there are requirements for the straightness of the metal round needle. At present, in the production of round needles, manual visual inspection of their straightness is mainly relied on, which has pain points such as low efficiency, high misjudgment rate, and high labor costs. With the development of China's spectacle industry, the industry urgently needs an automated detection solution to improve production efficiency and quality control capabilities. Content of the Utility Model

[0003] Aiming at the deficiencies of the existing technology, the purpose of the utility model is to provide a round needle straightness detection device based on machine vision with high efficiency.

[0004] To achieve the above purpose, the utility model provides the following technical solution: A round needle straightness detection device based on machine vision, including a frame, a detection turntable, a vision detection mechanism and a feeding mechanism. The detection turntable is rotatably arranged on the frame. The feeding mechanism and the vision detection mechanism are installed on the frame around the detection turntable in a circular shape and are located above the detection turntable, forming a feeding station and a detection station. During detection, the round needle is conveyed to the detection turntable through the feeding mechanism. The detection turntable rotates and drives the round needle to the lower part of the vision detection mechanism, and then is detected by shooting through the vision detection mechanism.

[0005] As a further improvement of the utility model, the feeding mechanism includes a storage bin, a feeding base and a pushing component. The feeding base is fixedly installed on the frame near the detection turntable. The storage bin is fixedly installed on the feeding base and is located above the detection turntable. The pushing component is arranged in the storage bin to send out the round needles in the storage bin one by one and drop them onto the detection turntable.

[0006] As a further improvement of the utility model, the storage bin includes a bin body and a discharge baffle. A slope is provided on the upper side of the bin body. The round needles are placed on the slope. The discharge baffle is fixed on the bin body and is located at the lower end of the slope, forming a feeding channel that only allows a single round needle to pass through with the lower end of the slope. The pushing component is arranged at the lower end of the feeding channel to send out the round needle at the bottom of the feeding channel and drop it onto the detection turntable.

[0007] As a further improvement of the utility model, a visual window is opened on the discharge baffle.

[0008] As a further improvement of the present utility model, the material pushing assembly includes a material pushing plate and a power component for driving the material pushing plate to reciprocate in the material storage bin. A slide rail is provided in the material storage bin, and the material pushing plate is slidably arranged on the slide rail. A material pushing hole adapted to the round needle is formed on the material pushing plate.

[0009] As a further improvement of the present utility model, the power component includes a power motor, a crank and a connecting rod. The crank is fixedly installed on the rotating shaft of the power motor. One end of the connecting rod is hinged to the crank, and the other end is hinged to the material pushing plate.

[0010] As a further improvement of the present utility model, a trigger station is further provided on the frame between the feeding station and the detection station. A trigger sensor is provided at the trigger station. The trigger sensor detects the round needle on the turntable and communicates with the vision detection mechanism, so as to send a signal to the vision detection mechanism when the trigger sensor detects that the round needle is triggered.

[0011] As a further improvement of the present utility model, the detection turntable is of a transparent structure. The vision detection mechanism includes a detection mounting rod, an imaging system and a light compensation plate. The lower end of the detection mounting rod is fixedly installed at the detection station. Both the imaging system and the light compensation plate are fixedly installed on the mounting rod. Among them, the light compensation plate is located below the detection turntable, and the light source direction is upward. The imaging system is located above the detection turntable, and the shooting direction is downward.

[0012] The beneficial effects of the present utility model: Compared with the traditional straightness detection method, the present utility model realizes the feeding of round needles one by one through the setting of the feeding mechanism, improves the detection efficiency, and realizes the effect of automatic round needle feeding. At the same time, the conversion of workstations is realized by rotating the detection turntable. The setting of the trigger station and the trigger sensor ensures that the vision detection mechanism can timely and accurately photograph and detect the round needle. The transparent structure of the detection turntable, combined with the light compensation plate and the imaging system at specific positions, provides good conditions for vision detection, and improves the detection accuracy and reliability. Description of the Drawings

[0013] Figure 1 It is the overall structure diagram of the round needle straightness detection device based on machine vision of the present utility model;

[0014] Figure 2 is Figure 1 the overall structure diagram of the feeding mechanism in

[0015] Figure 3 is Figure 2 the overall structure diagram of the material pushing assembly in

[0016] Figure 4 is Figure 1 the overall structure diagram of the vision detection mechanism in Detailed implementation manners

[0017] The following will further elaborate on the present utility model in combination with the embodiments given in the accompanying drawings.

[0018] Referring to Figure 1 As shown, the circular needle straightness detection device based on machine vision in this embodiment mainly includes a frame 1, a detection turntable 2, a vision detection mechanism 3, and a feeding mechanism 4. The detection turntable 2 is rotatably arranged on the frame 1. The feeding mechanism 4 and the vision detection mechanism 3 are installed around the detection turntable 2 on the frame 1 in a circular shape and are located above the detection turntable 2, forming a feeding station and a detection station respectively. During detection, the feeding mechanism 4 transports the circular needle to the detection turntable 2, the detection turntable 2 rotates to drive the circular needle under the vision detection mechanism 3, and then the vision detection mechanism 3 takes pictures for detection. During the straightness detection process: by using the rotational movement of the detection turntable 2, the automatic transmission of the circular needle from the feeding station to the detection station is realized, avoiding manual intervention and improving the automation degree of detection. Compared with the traditional method of detecting by cooperating with clamping components, there is no need to frequently clamp and release the circular needle. When detecting a large number of circular needles, the detection efficiency is significantly improved, and the problem of insufficient efficiency in the background art is solved.

[0019] Furthermore, referring to Figure 2 As shown, the feeding mechanism 4 includes a storage bin 41, a feeding base 42, and a pushing component 43. The feeding base 42 is fixedly installed on the frame 1 at a position close to the detection turntable 2. The storage bin 41 is fixedly installed on the feeding base 42 and is located above the detection turntable 2. The pushing component 43 is arranged in the storage bin 41 and is used to send out the circular needles in the storage bin 41 one by one and drop them onto the detection turntable 2. The storage bin 41 is used to store the circular needles to be detected. The pushing component 43 makes a reciprocating movement and only pushes one circular needle out of the storage bin 41 each time, ensuring that the circular needles are transported to the detection turntable 2 in an orderly and single-root manner, avoiding problems such as blockage or position deviation caused by the simultaneous transportation of multiple circular needles. This method of feeding one by one makes the position of the circular needle on the detection turntable 2 relatively fixed, facilitating the subsequent accurate shooting by the vision detection mechanism 3 and further improving the detection efficiency and accuracy.

[0020] Furthermore, referring to Figure 2As shown, the stock bin 41 includes a bin body 411 and a discharge baffle 412. A slope 413 is provided on the upper side of the bin body 411. The round needles are placed on the slope 413. The discharge baffle 412 is fixed on the bin body 411 and is located at the lower end of the slope 413, forming a feeding channel that only allows a single round needle to pass through with the lower end of the slope 413. The pushing component 43 is arranged at the lower end of the feeding channel and sends out the single round needle at the bottom of the feeding channel and drops it onto the detection turntable 2. At the same time, a visual window is provided on the discharge baffle 412 to facilitate observing the conveying situation of the round needles in the feeding channel. The round needles are placed on the slope 413 and will automatically slide downward along the slope 413 due to the action of gravity. The feeding channel formed by the discharge baffle 412 and the lower end of the slope 413 can only accommodate a single round needle to pass through, thus ensuring that only one round needle reaches the lower end of the feeding channel each time, and then it is pushed out by the pushing component 43. The setting of the visual window facilitates the operator to monitor the conveying state of the round needles in real time and timely discover possible problems such as blockage. This structure ensures the single and orderly conveying of the round needles, avoids the detection chaos caused by the simultaneous conveying of multiple round needles, improves the stability and reliability of feeding, and further guarantees the efficient progress of the entire detection process.

[0021] Further, referring to Figure 2 and Figure 3 As shown, the pushing component 43 includes a pushing plate 431 and a power component 432 for driving the pushing plate 431 to reciprocate in the stock bin 41. A slide rail is provided in the stock bin 41, and the pushing plate 431 is slidably arranged on the slide rail. A pushing hole adapted to the round needle is provided on the pushing plate 431. The power component 432 includes a power motor 4321, a crank 4322, and a connecting rod 4323. The crank 4322 is fixedly installed on the rotating shaft of the power motor 4321. One end of the connecting rod 4323 is hinged to the crank 4322, and the other end is hinged to the pushing plate 431. The power motor 4321 drives the crank 4322 to rotate. The crank 4322 is driven by the shaft of the power motor 4321 to rotate, driving the connecting rod 4323 to translate, and the connecting rod 4323 then drives the pushing plate 431 to perform a reciprocating linear motion on the slide rail. When the pushing plate 431 moves toward the lower end of the feeding channel, the pushing hole aligns with the round needle at the lower end of the feeding channel, and the round needle drops into the pushing hole. The next round needle slides down from the slope 413 to the lower end of the feeding channel under the action of gravity and is pushed out and dropped onto the detection turntable 2 as the pushing hole moves. Then the pushing plate 431 retracts, making the pushing hole align with the round needle at the lower end of the feeding channel and waiting for the next push. This structure realizes the reciprocating motion of the pushing plate 431 and accurately controls the pushing rhythm of the round needles. The pushing component 43 is driven by an automated power, eliminating the need for manual intervention in the feeding process, improving the automation degree and stability of feeding, and cooperating with the structure of the stock bin 41 to ensure that the round needles are conveyed to the detection turntable 2 one by one and stably, further improving the working efficiency of the entire detector.

[0022] Further, referring toFigure 1 and Figure 4 As shown, a trigger station is provided between the loading station and the detection station on the frame 1, and a trigger sensor 5 is provided on the trigger station. The trigger sensor 5 detects the round needle on the detection turntable 2 and communicates with the visual detection mechanism 3. When the trigger sensor 5 detects that the round needle is triggered, a signal is sent to the visual detection mechanism 3. The detection turntable 2 is a transparent structure, and the visual detection mechanism 3 includes a detection installation rod 31, an imaging system 32 and a fill light plate 33. The lower end of the detection installation rod 31 is fixedly installed on the detection station, and the imaging system 32 and the fill light plate 33 are both fixedly installed on the detection installation rod 31, wherein the fill light plate 33 is located below the detection turntable 2, with the light source facing upward, and the imaging system 32 is located above the detection turntable 2, with the shooting direction facing downward. When the detection turntable 2 rotates and drives the round needle to pass through the trigger station, the trigger sensor 5 detects the round needle, sends a signal to the visual detection mechanism 3, and triggers the imaging system 32 to shoot. Since the detection turntable 2 is a transparent structure, the fill light plate 33 illuminates upward from the bottom, which can provide uniform and sufficient backlight for the circular needle, so that the imaging system 32 can clearly capture the outline of the circular needle when shooting from the top down, which is convenient for the subsequent accurate detection of the straightness of the circular needle. The setting of the trigger sensor 5 ensures that the imaging system 32 takes pictures when the circular needle reaches the accurate position of the detection station, avoiding the detection error caused by inaccurate shooting timing; the transparent detection turntable 2 cooperates with the backlighting of the fill light plate 33, and compared with the traditional detection device, it can obtain the image information of the circular needle more clearly, improve the accuracy and reliability of the detection, and effectively solve the problem of insufficient detection accuracy that may exist in the background technology.

[0023] Correspondingly, the detection machine of this embodiment is also provided with three discharging channels to form a discharging station, and the detected round needles are classified and discharged by blowing. In this way, the loading station, triggering station, detection station and discharging station of the detection machine of this embodiment are arranged in a circle in sequence along the rotation direction of the detection turntable 2.

[0024] In summary, this solution realizes a fully automated process of round needles from automatic feeding, precise positioning to visual inspection through the coordinated work of the detection turntable 2, the feeding mechanism 4, the visual inspection mechanism 3 and the trigger sensor 5. Compared with the detection method of the background technology through the clamping component, the inefficiency caused by frequent clamping and loosening of the round needles is avoided. At the same time, the round needles are transported one by one through the cooperation of the storage bin 41 and the pushing component 43, and the trigger sensor 5 is used to accurately trigger the shooting, and the transparent detection turntable 2 is combined with the backlighting of the fill light plate 33. The detection efficiency and accuracy are significantly improved, and it has the advantages of high degree of automation, stable and reliable detection, etc., which effectively solves the shortcomings of the background technology.

[0025] The above are only the preferred embodiments of the present utility model, and the protection scope of the present utility model is not limited to the above embodiments. All technical solutions falling within the concept of the present utility model belong to the protection scope of the present utility model. It should be noted that for those of ordinary skill in the art, several improvements and refinements made without departing from the principle of the present utility model should also be regarded as within the protection scope of the present utility model.

Claims

1. A circular needle straightness detection device based on machine vision, characterized in that: It includes a frame (1), a detection turntable (2), a vision detection mechanism (3) and a feeding mechanism (4). The detection turntable (2) is rotatably arranged on the frame (1). The feeding mechanism (4) and the vision detection mechanism (3) are installed on the frame (1) in a circular pattern around the detection turntable (2) and are located above the detection turntable (2), forming a feeding station and a detection station. During detection, the round needles are conveyed to the detection turntable (2) by the feeding mechanism (4). The detection turntable (2) rotates and carries the round needles under the vision detection mechanism (3), and then the vision detection mechanism (3) takes pictures for detection.

2. The circular needle straightness detection device based on machine vision according to claim 1, wherein: The feeding mechanism (4) includes a storage bin (41), a feeding base (42) and a pushing component (43). The feeding base (42) is fixedly installed on the frame (1) at a position close to the detection turntable (2). The storage bin (41) is fixedly installed on the feeding base (42) and is located above the detection turntable (2). The pushing component (43) is arranged in the storage bin (41) to send out the round needles in the storage bin (41) one by one and drop them onto the detection turntable (2).

3. The circular needle straightness detection device based on machine vision according to claim 2, wherein: The storage bin (41) includes a bin body (411) and a discharge baffle (412). A slope (413) is provided on the upper side of the bin body (411). The round needles are placed on the slope (413). The discharge baffle (412) is fixed on the bin body (411) and is located at the lower end of the slope (413), forming a feeding channel that only allows a single round needle to pass through with the lower end of the slope (413). The pushing component (43) is arranged at the lower end of the feeding channel to send out the lowermost round needle in the feeding channel and drop it onto the detection turntable (2).

4. The circular needle straightness detection device based on machine vision according to claim 3, characterized in that: A visual window is provided on the discharge baffle (412).

5. The machine vision-based circular needle straightness detection device according to claim 2 or 3, wherein: The pushing component (43) includes a pushing plate (431) and a power component (432) for driving the pushing plate (431) to reciprocate in the storage bin (41). A slide rail is provided in the storage bin (41). The pushing plate (431) is slidably arranged on the slide rail. A pushing hole adapted to the round needle is provided on the pushing plate (431).

6. The circular needle straightness detection device based on machine vision according to claim 5, wherein: The power component (432) includes a power motor (4321), a crank (4322) and a connecting rod (4323). The crank (4322) is fixedly installed on the rotating shaft of the power motor (4321). One end of the connecting rod (4323) is hinged to the crank (4322), and the other end is hinged to the pushing plate (431).

7. The machine vision-based circular needle straightness detection device according to any one of claims 1 to 3, characterized in that: A trigger station is further provided on the frame (1) between the feeding station and the detection station. A trigger sensor (5) is provided at the trigger station. The trigger sensor (5) detects the round needles on the detection turntable (2) and communicates with the vision detection mechanism (3) to send a signal to the vision detection mechanism (3) when the trigger sensor (5) detects that the round needle is triggered.

8. The machine vision-based circular needle straightness detection device according to any one of claims 1 to 3, characterized in that: The detection turntable (2) is of a transparent structure. The vision detection mechanism (3) includes a detection mounting rod (31), an imaging system (32), and a light supplementing plate (33). The lower end of the detection mounting rod (31) is fixedly installed on the detection station. Both the imaging system (32) and the light supplementing plate (33) are fixedly installed on the mounting rod (31). Among them, the light supplementing plate (33) is located below the detection turntable (2) with the light source direction facing upward, and the imaging system (32) is located above the detection turntable (2) with the shooting direction facing downward.

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