CN113171998B - Automatic detection method and device for workpiece surface flaws - Google Patents

Abstract

The invention belongs to the field of flaw automatic detection, and provides a workpiece surface flaw automatic detection method and a device aiming at the problems that workpiece flaw detection requires a plurality of devices to be matched with each other, workpieces are conveyed on the same horizontal plane, and the occupied area is large, wherein the device comprises: the feeding mechanism is used for vibrating and feeding and placing the workpiece to the conveying starting end on the conveying mechanism; the conveying mechanism comprises a spiral upward conveying belt, the conveying tail end is positioned above the outer side of the conveying starting end and used for conveying the workpiece placed on the feeding mechanism from the conveying starting end to the conveying tail end of the conveying belt and passing through a preset area corresponding to the automatic detection mechanism; the automatic detection mechanism is used for automatically detecting the surface flaws of the workpiece when the workpiece conveyed on the conveying mechanism reaches a preset area, and outputting flaw detection result information; and the sorting mechanism is positioned at the conveying tail end of the conveying mechanism and used for correspondingly sorting and conveying the workpieces positioned at the tail end of the conveying mechanism according to the flaw detection result information output by the automatic detection mechanism.

Description

Automatic detection method and device for workpiece surface flaws

Technical Field

The invention belongs to the field of automatic flaw detection, and particularly relates to a method and a device for automatically detecting flaws on the surface of a workpiece.

Background

With the increasing requirements of people on the performance and appearance of mechanical processing products such as automobiles and the like, the quality inspection of workpieces of the mechanical processing products is more and more strict. For workpiece detection in a production line, defects are generally detected by a plurality of workers, the work requires abundant working experience of detection personnel, the detection workers are required to keep high-intensity attention all the time, visual fatigue is easily generated for the workers working continuously in the production line, so that the detection efficiency and the detection accuracy are easily reduced, and the phenomenon of false detection and missed detection is inevitably generated. How to improve the automation level of flaw detection and ensure the detection efficiency and accuracy is an urgent problem faced by the automobile industry in China.

Meanwhile, a plurality of devices are generally required to be matched with each other for the surface of the workpiece in the production line at present, and the workpiece is generally transported in a plane from one device to another device; the whole process for detecting the surface flaws of the workpiece occupies a large area and is complex in process.

Disclosure of Invention

The invention provides a method and a device for automatically detecting surface flaws of workpieces, which solve the problems that in the prior art, a plurality of devices are required to be matched with each other, workpieces are conveyed on the same horizontal plane, and the occupied area is large.

The basic scheme of the invention is as follows: workpiece surface flaw automatic checkout device, its characterized in that includes:

the feeding mechanism is used for vibrating and feeding and placing the workpiece to the conveying starting end on the conveying mechanism;

the conveying mechanism comprises an upward spiral conveying belt; the conveying starting end of the conveying belt is positioned below the conveying tail end, and the conveying tail end is positioned outside the conveying starting end; the automatic detection mechanism is used for conveying workpieces placed on the feeding mechanism from a conveying starting end to a conveying tail end of the conveying belt and passing through a preset area corresponding to the automatic detection mechanism, and the preset area is a preset fixed area on the conveying mechanism;

the automatic detection mechanism is used for automatically detecting the surface flaws of the workpiece when the workpiece conveyed on the conveying mechanism reaches a preset area, and outputting flaw detection result information;

and the sorting mechanism is positioned at the conveying tail end of the conveying mechanism and used for correspondingly sorting and conveying the workpieces positioned at the tail end of the conveying mechanism according to the flaw detection result information output by the automatic detection mechanism.

The basic scheme has the beneficial effects that: in the scheme, a workpiece is fed to the conveying starting end of the conveying mechanism through the feeding mechanism, and then the workpiece gradually reaches the conveying tail end along with the spiral upward conveying belt; in the process, when a workpiece passes through a preset area on the conveyor belt, the automatic detection mechanism automatically detects the surface flaws of the workpiece on the surface of the workpiece, and sends flaw detection result information to the sorting mechanism; after reaching the conveying tail end, the workpieces reach a sorting mechanism under the action of inertia, and the sorting mechanism sorts the workpieces according to the flaw detection result information; the automatic flaw detection of the workpiece is realized, the subjective error which can occur during manual detection is avoided, and the problem of accuracy reduction caused by fatigue is reduced. Simultaneously, this scheme adopts the ascending conveyer belt of spiral, when more conveying work pieces, reduces shared space.

Further, the automatic workpiece surface flaw detection device comprises a shell, wherein the shell is bowl-shaped and comprises a flat bottom part and a slope part; the feeding mechanism is arranged at the flat bottom of the shell, and the conveying mechanism is arranged at the slope of the shell; the shell is provided with a fixing mechanism, the free end of the fixing mechanism is connected with the automatic detection mechanism, and the automatic detection mechanism is over against the preset area of the conveying mechanism; the top end of the shell is provided with the sorting mechanism.

Further, the sorting mechanism includes a control member and a pushing member;

the pushing piece is positioned between the delivery tail end of the delivery mechanism and the qualified piece outlet of the workpiece flaw automatic detection mechanism, the fixed end of the pushing piece is fixed with the shell, and the free end of the pushing piece and the delivery tail end can be spliced;

the control piece is arranged on the shell and used for controlling the push rod of the pushing piece to be pushed out according to the flaw detection result information, so that the workpiece contacted with the push rod can fall to the front of the conveying direction of the preset area or the feeding mechanism along the inner wall of the shell.

Has the beneficial effects that: in the scheme, after the workpiece reaches the conveying tail end, the workpiece reaches the free end of the pushing piece under the action of inertia; the control piece controls the pushing piece to be pushed out and retracted according to the flaw detection result information, and the workpiece is shunted according to the flaw detection result. The pushing piece is in a pushing state, the pushing piece can just hit and drop the workpiece sliding to the pushing piece in the front of the conveying direction of the preset area or at the feeding mechanism, so that the workpiece is detected again through the detection of the automatic detection mechanism, and the condition that the qualified workpiece is mistakenly detected as the unqualified workpiece by single detection is avoided. And, after the screening of letter sorting mechanism, qualified work piece is located the top, and unqualified work piece falls into the shell bottom again, utilizes the difference in height to part qualified work piece and unqualified work piece, compares in qualified export and unqualified export when being located similar position, and qualified work piece and unqualified work piece behind the letter sorting mechanism can be mixed the condition wrong each other, and this scheme is more outstanding with the letter sorting effect performance of letter sorting mechanism.

Furthermore, the pushing piece is an air cylinder, one end of the air cylinder is fixedly connected with the shell, the free end of a push rod of the air cylinder is connected with a pushing block, and one end face, far away from the air cylinder, of the pushing block can be spliced with the conveying tail end of the conveying mechanism;

the control piece comprises a power supply and a controller, the controller is used for controlling the power supply to supply power to the air cylinder, and the controller controls the push rod of the air cylinder to be pushed out or retracted according to the flaw detection result information.

Further, the sorting mechanism controls to sort the workpieces to qualified piece outlets when the received flaw detection result information is qualified; and when the received flaw detection result information is unqualified, the workpiece is pushed out under control, so that the workpiece reaches the feeding mechanism.

Further, the automatic detection mechanism includes:

the position detection module is used for detecting the position of a workpiece on the conveyor belt, sending a starting signal to the control module when the workpiece is in a preset area, and sending a closing signal to the first control module when the workpiece leaves the preset area;

the control module is used for simultaneously starting the lighting module and the image acquisition module according to the starting signal; according to the closing signal, closing the image acquisition module;

the lighting module is used for irradiating light rays to a preset area according to the starting signal;

the image acquisition module is used for acquiring primary image information of a preset area according to the starting signal and sending the primary image information to the storage module;

the storage module is used for storing the primary image information acquired by the image acquisition module and a pre-stored workpiece surface image;

the image processing module is used for screening primary image information of the workpiece from the storage module, synthesizing intermediate image information, performing noise reduction and burr removal on the intermediate image information to obtain a workpiece surface image, and sending the workpiece surface image to the image recognition module;

the image recognition module is used for obtaining flaw detection result information according to a comparison result between the standard image and the workpiece surface image and sending the flaw detection result information to the output module;

and the output module is used for sending the flaw detection result information sent by the image recognition module to the sorting mechanism.

Has the advantages that: for the acquired images, multi-image synthesis can be carried out, and the problem that the corresponding images of the whole workpiece are wrong when subsequent analysis processing is carried out due to the fact that single image acquisition is wrong is avoided. By adopting the operation of noise reduction and burr removal, the image edge blur acquired by the image acquisition module when the workpiece moves in the preset area is reduced, the influence on the analysis of the whole image is reduced, and the final flaw detection result is more accurate.

Furthermore, the conveying mechanism comprises foldable conveying blades, the front end and the rear end of each conveying blade are connected with each other, two adjacent conveying blades can be opened and closed, and the conveying blades can support workpieces.

Has the beneficial effects that: considering that the conveying mechanism is upwards screwed, the conveying belt is required to deform in the moving process, and for convenience of implementation, a front-back connection mode that a plurality of conveying blades can be opened and closed is adopted to ensure the stable operation of the conveying belt.

Further, the transfer blade has magnetism.

Has the advantages that: considering that most of the workpieces are iron, the conveying blades support the workpieces to drive the workpieces to move along the conveying direction after the workpieces reach the conveying blades through the principle of magnetic attraction.

Further, the automatic detection device for the workpiece surface flaws comprises a plurality of automatic detection mechanisms; each automatic detection mechanism corresponds to different preset areas on the conveying mechanism;

and the control piece of the sorting mechanism sets the workpiece detection result of the workpiece to be qualified when all the flaw detection result information of the same workpiece is qualified according to all the flaw detection result information.

Further, the image processing module is used for screening primary image information of the same workpiece in the same posture from the storage module, synthesizing intermediate image information, performing noise reduction and burr removal on the intermediate image information to obtain a workpiece surface image, and sending the workpiece surface image to the image recognition module.

The automatic detection method of the surface flaw of the workpiece is applied to the automatic detection mechanism; the method comprises the following steps:

detecting the position of a workpiece on a conveyor belt;

when the workpiece is in the preset area, irradiating light rays to the preset area, and collecting primary image information of the preset area;

synthesizing intermediate image information according to the primary image information of the same workpiece; performing noise reduction and burr removal on the intermediate image information to obtain a workpiece surface image;

obtaining flaw detection result information according to a comparison result between a preset standard image and the workpiece surface image;

and outputting the flaw detection result information outwards.

Drawings

FIG. 1 is a top view of an exemplary apparatus for automatically detecting surface defects of a workpiece according to a first embodiment of the present invention;

FIG. 2 isbase:Sub>A cross-sectional view taken along section A-A' of FIG. 1;

FIG. 3 is a cross-sectional view of area B of FIG. 1;

fig. 4 is a schematic block diagram of the automatic detection mechanism and the sorting mechanism of fig. 1.

Detailed Description

The following is further detailed by way of specific embodiments:

the first embodiment:

reference numerals in the drawings of the specification include: the automatic sorting machine comprises a shell 1, an outer wall 11, a cavity 12, an inner wall 13, a mounting hole 14, a feeding mechanism 2, a conveying mechanism 3, a conveying starting end 31, a conveying tail end 32, a fixing mechanism 4, an automatic detection mechanism 5, a position detection module 51, a control module 52, an illumination module 53, an image acquisition module 54, a storage module 55, an image processing module 56, an image recognition module 57, an output module 58, a sorting mechanism 6, a control part 61 and a pushing part 62.

The automatic detection device for the surface flaws of the workpiece, as shown in fig. 1 and 2, comprises:

the shell 1 is bowl-shaped, and the shell 1 comprises a flat bottom part and a slope part;

the feeding mechanism 2 is arranged at the flat bottom part of the shell 1; a conveying starting end 31 for vibrating and feeding to realize the placing of the workpieces on the conveying mechanism 3 through vibration;

a transfer mechanism 3 mounted on the slope portion of the housing 1; comprises a spiral upward conveying belt; the conveying starting end 31 of the conveyor belt is positioned below the conveying tail end 32, and the conveying tail end 32 is positioned outside the conveying starting end 31; the automatic detection device is used for conveying workpieces placed on the feeding mechanism 2 from a conveying starting end 31 to a conveying tail end 32 of a conveyor belt and passing through a preset area corresponding to the automatic detection mechanism 5, wherein the preset area is a preset fixed area on the conveying mechanism 3;

the fixing mechanism 4 is fixedly connected with the upper end surface of the right side of the shell 1, and the free end of the fixing mechanism 4 faces the shell 1;

an automatic detection mechanism 5 which is arranged at the free end of the fixing mechanism 4 and faces towards the fixing area on the conveying mechanism 3; the automatic flaw detection device is used for automatically detecting surface flaws of the workpiece when the workpiece conveyed on the conveying mechanism 3 reaches a preset area, and outputting flaw detection result information;

the sorting mechanism 6, as shown in fig. 1, is installed on the upper end surface of the left side of the housing 1, is located at the conveying end 32 of the conveying mechanism 3, and is configured to correspondingly sort and convey the workpieces located at the end of the conveying mechanism 3 according to the flaw detection result information output by the automatic detection mechanism 5.

In the scheme, workpieces are fed to the conveying starting end 31 of the conveying mechanism 3 through the feeding mechanism 2, and then the workpieces gradually reach the conveying tail end 32 along with the spiral upward conveying belt; in the process, when the workpiece passes through a preset area on the conveyor belt, the automatic detection mechanism 5 automatically detects the surface flaws of the workpiece on the surface of the workpiece, and sends flaw detection result information to the sorting mechanism 6; after the workpieces reach the conveying tail end, the workpieces reach the sorting mechanism 6 under the inertia effect, and the sorting mechanism 6 sorts the workpieces according to the flaw detection result information.

The following is a detailed description of the implementation details of the automatic workpiece surface flaw detection apparatus according to the present invention, and the following is only provided for the convenience of understanding and is not necessary for implementing the present invention.

As shown in fig. 2 and 3, the housing 1 includes an inner wall 13, a cavity 12 and an outer wall 11, the cavity 12 is located between the inner wall 13 and the outer wall 11, and a portion of the inner wall 13 is fixed to the outer wall 11. In some embodiments, the housing is integrally formed.

The inner wall 13 is provided with a groove for installing the conveying mechanism 3, a gap is formed between the conveying starting end 31 and the conveying tail end 32 of the conveying mechanism 3 and the side wall of the groove, the gap is used for facilitating conveying of the conveying belt in the conveying mechanism 3, and a driving part of the conveying mechanism 3 is installed in the cavity 12 and used for driving the conveying belt to move.

The conveying belt of the conveying mechanism 3 comprises a plurality of foldable conveying blades, the front end and the rear end of each conveying blade are connected with each other, two adjacent conveying blades can be opened and closed, and the conveying blades can support workpieces. The folding before the transfer blade is here for the convenience of storage and, further, for the convenience of hiding the transfer blade into the cavity 12 from the space between the transfer tip 32 and the recess after the transfer blade has reached the transfer tip 32. The transport blade, which is recessed at the transport end 32 in the cavity 12, can be moved back to the transport start 31 by the drive and then back to the groove surface of the inner wall 13 through the gap between the transport start 31 and the groove. The drive particularly drives the movement of the transfer blade and the return of the transfer blade through the gap between the transfer start 31 and transfer end 32 and the groove can be done with reference to the structure of the conventional ramp elevator. The shape of the conveying blade is changed, and the fan-shaped conveying blade is beneficial to spiral lifting along the inner wall 13 and is adaptive to the position to be placed.

In some embodiments, a transfer plate may be further disposed in the cavity 12, the transfer blades enter the cavity 12 from the gap between the transfer end 32 and the groove, and then reach the transfer plate, and then the transfer blades on the transfer plate are folded by two-two combination, when the number of the transfer blades on the transfer plate reaches a preset value, the transfer plate carries the transfer blades from the transfer end 32 to the transfer beginning 31; the transport of a large number of conveyor blades back to the conveyor start 31 is effected by a plurality of conveyor plates, so that a rational operation of the conveyor belt is ensured.

The application provides the following embodiments for the problem of how the conveying blade supports the workpiece and avoids the workpiece from falling off the conveying blade: firstly, a cavity is arranged in a conveying blade, a magnet is arranged in the cavity, and the position of a workpiece on the conveying blade is limited by the magnetic force between the magnet and an iron workpiece; secondly, the surface of the conveying blade is frosted or uneven elastic coating is paved to improve the friction force between the workpiece and the conveying blade and realize the position limitation of the workpiece on the conveying blade.

In some embodiments, the feeding mechanism 1 performs feeding by using a vibration feeding method, such as a vibration feeding machine, to transport the workpieces from the upper surface of the feeding mechanism to the transmission starting end 31 of the conveying mechanism 3, the transmission starting point of the conveying mechanism 12 in fig. 1 is at the left end, and the vibration feeding machine provides kinetic energy to the workpieces on the upper surface thereof by vibration, so that the workpieces can move to the transmission starting end 31 of the conveying mechanism 3 on the left side, and then the workpieces are driven by the conveying mechanism 3 under the magnetic force of the conveying blades of the conveying mechanism to move from the transmission starting end 31 to the transmission end 32 of the conveying mechanism. The vibration feeding mechanism adopts the existing vibration feeding machine, and the scheme is not substantially changed, so that the description is not repeated. The vibration feeder is installed at the bottom of the housing 1, and the left edge of the vibration feeder is close to the conveyance starting end 31 of the conveyance mechanism 3.

In some embodiments, the fixing mechanism may be a bent fixing rod, one end of which is fixedly connected with the upper surface of the housing 1; the fixed connection mode can be welding, also can be the mode of connection that the cementing, tenon fourth of twelve earthly branches connection etc. can be used for fixing the dead lever on shell 1. The fixing mechanism can also be a bendable telescopic component, for example, the fixing mechanism comprises a stabilizer bar with one end welded with the upper surface of the shell 1, a chute is formed in the free end of the stabilizer bar, a sliding rod capable of sliding along the chute is arranged in the chute, one end of the sliding rod, extending out of the chute, is connected with the automatic detection mechanism 5, a positioning hole is formed in the sliding rod, an auxiliary hole is formed in the chute, the same internal thread is arranged in the positioning hole and the auxiliary hole, and when the fixing mechanism is used, a user can simultaneously penetrate through the positioning hole of the sliding rod by using a nut to stretch into the auxiliary hole in the chute to realize the limiting of the sliding rod.

In some embodiments, as shown in fig. 4, the automatic detection mechanism 5 includes:

the position detection module 51 is used for detecting the position of a workpiece on the conveyor belt, sending a starting signal to the control module when the workpiece is in a preset area, and sending a closing signal to the first control module when the workpiece leaves the preset area; here, each automatic detection mechanism 5 corresponds to a unique preset area;

a control module 52 for simultaneously activating the illumination module 53 and the image acquisition module 54 according to the activation signal; turning off the image acquisition module 54 according to the turn-off signal;

an illumination module 53 for irradiating light to a preset area according to the start signal;

the image acquisition module 54 is used for acquiring primary image information of a preset area according to the starting signal and sending the primary image information to the storage module 55;

a storage module 55, configured to store the primary image information acquired by the image acquisition module 54 and a pre-stored workpiece surface image;

the image processing module 56 is configured to screen out primary image information of the workpiece from the storage module 55, synthesize intermediate-level image information, perform noise reduction and burr removal on the intermediate-level image information to obtain a workpiece surface image, and send the workpiece surface image to the image recognition module 57;

an image recognition module 57, configured to obtain defect detection result information according to a comparison result between the standard image and the workpiece surface image, and send the defect detection result information to an output module 58;

an output module 58, configured to send the defect detection result information sent by the image recognition module 57 to the sorting mechanism 6.

Further, the automatic detection mechanism may further include a plurality of image acquisition modules 54, and all the image acquisition modules 54 may send the acquired primary image information to the storage module 55; the image processing module 56 will screen all the primary image information of the same workpiece from the storage module 55, and synthesize the intermediate image information of the same workpiece by using the primary image information of the same workpiece, and then perform noise reduction and burr removal on the obtained intermediate image information to obtain a workpiece surface image, and send the workpiece surface image to the image recognition module 57.

Further, it is contemplated that the pose of the primary image information of the workpiece surface acquired by the different image acquisition modules 54 may be different; all image acquisition modules 54 send the acquired primary image information and the current posture to the storage module 55 for storage; the image processing module 56 will screen out all the primary image information of the same workpiece in the same posture from the storage module 55, and the primary image information of the same workpiece in the same posture is synthesized into the intermediate image information of the workpiece in the aforementioned posture, and then the obtained intermediate image information is subjected to noise reduction and burr removal to obtain the workpiece surface image of the workpiece in the aforementioned posture, and is sent to the image recognition module 57.

For the acquired images, multi-image synthesis can be carried out, and the problem that the corresponding images of the whole workpiece are wrong when subsequent analysis processing is carried out due to the fact that single image acquisition is wrong is avoided. By adopting the operation of noise reduction and burr removal, the image edge blur acquired by the image acquisition module when the workpiece moves in the preset area is reduced, the influence on the analysis of the whole image is reduced, and the final flaw detection result is more accurate.

In some embodiments, as shown in fig. 1, the housing 1 is divided on the inner wall 13 into a qualified screening area and a qualified discharge area, the qualified screening area and the qualified discharge area are located on the same height plane with the conveying end 32 of the conveying mechanism 3, and the qualified screening area is located between the conveying end 32 and the qualified discharge area. The workpieces move from the conveying starting end 31 to the conveying tail end 32 along with the transportation of the conveying mechanism 3, the conveying belt is sunk into the cavity 12 from a gap between the conveying tail end 32 and the groove, the gap is smaller than the workpieces, the workpieces cannot leak into the cavity 12 from the gap, and the workpieces can pass through the gap to reach the qualified screening area and the qualified discharging area due to inertia of the workpieces.

When the workpiece reaches the qualified screening area, the workpiece can be sorted by the sorting mechanism 6 according to the received flaw detection result information sent by the automatic detection mechanism 5, and the sorting method specifically comprises the following steps: when the received flaw detection result information is qualified, controlling to sort the workpieces to qualified outlet, namely, enabling the workpieces to reach a qualified discharge area; when the received flaw detection result information is not qualified, the workpiece is pushed out by control so that the workpiece reaches the front part of the feeding mechanism 1 or the conveying direction of the preset area.

Specifically, the sorting mechanism 6 includes a control member 61 and a pushing member 62. As shown in fig. 1, the housing 1 is provided with a mounting hole 14 at a qualified screening area of the inner wall 13, as shown in fig. 3, the mounting hole 14 is communicated with the cavity 12, a pushing member 62 is mounted on the left inner wall of the cavity 12, and a push rod of the pushing member 62 can extend out of the mounting hole 14 to contact with a workpiece; the control member 61 is also installed in the cavity 12, and is used for controlling the push rod in the pushing member 62 to be pushed out of the installation hole 14, so that the workpiece contacted with the push rod is knocked down, the workpiece falls to the front of the conveying direction of the preset area or the upper surface of the feeding mechanism 2 along the inner wall 13 of the shell 1, and the workpiece passes through the preset area corresponding to the automatic detection mechanism 5 again to be detected for two times or n times (n is more than or equal to 2).

Further, as shown in fig. 3, the left end of the pushing member 62 is fixed to the inner wall 13 of the housing 1, and the free end of the pushing member 62 (the end of the push rod) is spliced with the transfer end 32 so that the workpiece can be moved from the transfer end 32 to the free end of the pushing member 62 under the action of inertia.

Further, the pushing member 62 is a cylinder, the left end of the cylinder is fixedly connected with the housing 1, the free end of the push rod of the cylinder is connected with a pushing block, and one end face of the pushing block, which is far away from the cylinder, can be spliced with the conveying tail end 32 of the conveying mechanism 3; the control part 61 comprises a power supply and a controller, the controller is used for controlling the power supply to supply power to the air cylinder, and the controller controls the push rod of the air cylinder to be pushed out or retracted according to the flaw detection result information.

After the workpiece reaches the delivery end 32, it reaches the free end of the pusher under the action of inertia; the control part 61 controls the pushing part 62 to push out and retract according to the flaw detection result information, and the workpiece is shunted according to the flaw detection result. When the pushing piece is in a pushing state, the pushing piece 62 can just hit the workpiece sliding to the pushing piece to the front of the conveying direction of the preset area or the feeding mechanism 1, so that the workpiece is detected again through the detection of the automatic detection mechanism, and the condition that the qualified workpiece is mistakenly detected as the unqualified workpiece by single detection is avoided.

In some embodiments, the sorting mechanism 6 further comprises a robot for grasping the workpiece from the acceptable outfeed area in fig. 1 to the acceptable piece and placing it on a transfer cart, a next process storage bin, a next process infeed, or the like.

In some embodiments, the automatic workpiece surface flaw detection apparatus includes a plurality of automatic detection mechanisms 5; each automatic detection mechanism 5 corresponds to a different preset area on the conveying mechanism 3; and the control part 61 of the sorting mechanism 6 sets the workpiece detection result of the workpiece to be qualified when all the defect detection result information of the same workpiece is qualified according to all the defect detection result information, and further controls the free end of the pushing part 62 to retract into the mounting hole 14 of the inner wall 13 of the shell 1 so as to ensure that the workpiece can reach a qualified discharging area through a qualified screening area, thereby realizing the separation of qualified workpieces in the workpiece.

In some embodiments, the automatic workpiece surface flaw detection device further comprises a controller, a timer and an alarm; the timer counts time when the device is started and sends the current time information T to the controller; the controller is internally provided with a preset maximum time T0, and when the T is more than or equal to the T0, the controller controls the alarm to start, and the whole device stops running.

Considering that unqualified work piece can be frequent carry out work piece surface flaw automated inspection many times, along with qualified work piece is separated by sorting mechanism, the percentage of the unqualified work piece of work piece in the shell is more and more heavier, in order to avoid the waste of resource, this scheme breaks off the detection along with the time, reports to the police and reminds the staff to need to change all work pieces that wait in this device. Consequently, the staff can distinguish which workpiece is qualified through naked eyes, so that the waste of resources is avoided, or all workpieces which are unqualified with high probability are directly put into a subsequent recycling system.

Each module referred to in this embodiment is a logical module, and in practical applications, one logical unit may be one physical unit, may be a part of one physical unit, and may be implemented by a combination of multiple physical units. In addition, in order to highlight the innovative part of the present invention, elements that are not so closely related to solving the technical problems proposed by the present invention are not introduced in the present embodiment, but this does not indicate that other elements are not present in the present embodiment.

The second embodiment:

the invention also provides a method for automatically detecting the surface flaws of the workpiece, which is applied to an automatic detection mechanism in the device for automatically detecting the surface flaws of the workpiece; the method comprises the following steps:

s1, detecting the position of a workpiece on a spiral upward conveying belt;

s2, when the workpiece is in the preset area, irradiating light rays to the preset area, and collecting primary image information of the preset area;

s3, synthesizing intermediate image information according to the primary image information of the same workpiece; performing noise reduction and burr removal on the intermediate image information to obtain a workpiece surface image;

s4, obtaining flaw detection result information according to a comparison result between a preset standard image and the workpiece surface image;

s5, controlling to sort the workpieces to qualified workpiece outlets when all the flaw detection result information of the same workpiece is qualified according to the flaw automatic detection result information; when the defect detection result information of the same workpiece is unqualified, pushing the workpiece out of the shell to enable the workpiece to reach the front part of the feeding mechanism or the conveying direction of a preset area;

and S6, stopping the operation of the automatic detection device for the surface flaws of the workpiece when the operation time reaches the preset maximum time, and giving an alarm.

Wherein, steps S1 to S4 are executed by the automatic detection mechanism in the first embodiment; step S5 is executed in accordance with the sorting mechanism in the first embodiment, and step S6 is executed in accordance with the controller, timer, and alarm in the first embodiment.

That is, this embodiment is a method example corresponding to the first embodiment, and this embodiment can be implemented in cooperation with the first embodiment. The related technical details mentioned in the first embodiment are still valid in this embodiment, and are not described herein again in order to reduce repetition. Accordingly, the related-art details mentioned in the present embodiment can also be applied to the first embodiment.

The foregoing are embodiments of the present invention and are not intended to limit the scope of the invention to the particular forms set forth in the specification, which are set forth in the claims below, but rather are to be construed as the full breadth and scope of the claims, as defined by the appended claims, as defined in the appended claims, in order to provide a thorough understanding of the present invention. It should be noted that, for those skilled in the art, without departing from the structure of the present invention, several changes and modifications can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicability of the patent. The scope of the claims of the present application shall be defined by the claims, and the description of the embodiments and the like in the specification shall be used to explain the contents of the claims.

Claims (6)

1. Workpiece surface flaw automatic checkout device, its characterized in that includes:

the feeding mechanism is used for vibrating and feeding and placing the workpiece to the conveying starting end on the conveying mechanism;

the conveying mechanism comprises an upward spiral conveying belt, the conveying starting end of the conveying belt is positioned below the conveying tail end, and the conveying tail end is positioned on the outer side of the conveying starting end; the automatic detection mechanism is used for conveying workpieces placed on the feeding mechanism from a conveying starting end to a conveying tail end of the conveying belt and passing through a preset area corresponding to the automatic detection mechanism, and the preset area is a preset fixed area on the conveying mechanism;

the automatic detection mechanism is used for automatically detecting the surface flaws of the workpiece when the workpiece conveyed on the conveying mechanism reaches a preset area, and outputting flaw detection result information;

the sorting mechanism is positioned at the conveying tail end of the conveying mechanism and used for correspondingly sorting and conveying the workpieces positioned at the tail end of the conveying mechanism according to the flaw detection result information output by the automatic detection mechanism;

the automatic detection mechanism includes:

the position detection module is used for detecting the position of a workpiece on the conveyor belt, sending a starting signal to the control module when the workpiece is in a preset area, and sending a closing signal to the control module when the workpiece leaves the preset area;

the control module is used for simultaneously starting the lighting module and the image acquisition module according to the starting signal; according to the closing signal, closing the image acquisition module;

the lighting module is used for irradiating light rays to the preset area according to the starting signal;

the image acquisition modules are used for acquiring primary image information of a preset area according to the starting signal and sending the primary image information to the storage module, and the number of the image acquisition modules is multiple;

the storage module is used for storing the primary image information acquired by the image acquisition module and a pre-stored workpiece surface image;

the image processing module is used for screening primary image information of the workpiece from the storage module, synthesizing intermediate image information, performing noise reduction and burr removal on the intermediate image information to obtain a workpiece surface image, and sending the workpiece surface image to the image recognition module; the method comprises the steps that primary image information of a workpiece is screened out from a storage module, and the intermediate-level image information is synthesized, wherein all primary image information of the same workpiece in the same posture is screened out from the storage module, and a plurality of pieces of primary image information of the same workpiece in the same posture are synthesized to form the intermediate-level image information of the workpiece in the posture;

the image recognition module is used for obtaining flaw detection result information according to a comparison result between the workpiece surface image prestored in the storage module and the workpiece surface image sent by the image processing module and sending the flaw detection result information to the output module;

the output module is used for sending the flaw detection result information sent by the image recognition module to the sorting mechanism;

the automatic workpiece surface flaw detection device comprises a shell, wherein the shell is bowl-shaped and comprises a flat bottom part and a slope part; the feeding mechanism is arranged at the flat bottom of the shell, and the conveying mechanism is arranged at the slope of the shell; the shell is provided with a fixing mechanism, the free end of the fixing mechanism is connected with the automatic detection mechanism, and the automatic detection mechanism is over against the preset area of the conveying mechanism; the top end of the shell is provided with the sorting mechanism;

the sorting mechanism comprises a control piece and a pushing piece;

the pushing piece is positioned between the delivery tail end of the delivery mechanism and the qualified piece outlet of the workpiece flaw automatic detection mechanism, the fixed end of the pushing piece is fixed with the shell, and the free end of the pushing piece and the delivery tail end can be spliced;

the control piece is arranged on the shell and used for controlling the push rod of the pushing piece to push out, so that the workpiece contacted with the push rod falls to the feeding mechanism of the preset area along the inner wall of the shell.

2. The apparatus of claim 1, wherein the apparatus comprises: the pushing piece is an air cylinder, one end of the air cylinder is fixedly connected with the shell, the free end of a push rod of the air cylinder is connected with a pushing block, and one end face, far away from the air cylinder, of the pushing block can be spliced with the conveying tail end of the conveying mechanism;

the control part comprises a power supply and a controller, the controller is used for controlling the power supply to supply power to the air cylinder, and the controller controls the push rod of the air cylinder to be pushed out or retracted according to the flaw detection result information.

3. The apparatus according to any one of claims 1 or 2, wherein: the sorting mechanism is used for controlling the workpieces to be sorted to qualified piece outlets when the received flaw detection result information is qualified; and when the received flaw detection result information is unqualified, the workpiece is pushed out under control, so that the workpiece reaches the feeding mechanism.

4. The apparatus of claim 1, wherein the conveying mechanism comprises foldable conveying blades, the conveying blades are connected to each other at front and rear ends, two adjacent conveying blades can be opened and closed, and the conveying blades can support the workpiece; the transfer blade has magnetism.

5. The apparatus of claim 2, wherein: the automatic detection device for the workpiece surface flaws comprises a plurality of automatic detection mechanisms; each automatic detection mechanism corresponds to different preset areas on the conveying mechanism;

the control piece is further used for setting the workpiece detection result of the workpiece to be qualified when all the flaw detection result information of the same workpiece is qualified according to all the flaw detection result information.

6. The automatic detection method for the workpiece surface flaws is characterized by being applied to an automatic detection mechanism in the automatic flaw detection device for the workpiece surface according to any one of claims 1-5; the method comprises the following steps:

detecting the position of a workpiece on a conveyor belt;

when the workpiece is in the preset area, irradiating light rays to the preset area, and collecting primary image information of the preset area;

synthesizing intermediate image information according to the primary image information of the same workpiece; performing noise reduction and burr removal on the intermediate image information to obtain a workpiece surface image;

obtaining flaw detection result information according to a comparison result between a preset standard image and the workpiece surface image;

and outputting the flaw detection result information outwards.

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