CN113777042A - Visual detection device for shaft products - Google Patents
Visual detection device for shaft products Download PDFInfo
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
- G01N21/8851—Scan or image signal processing specially adapted therefor, e.g. for scan signal adjustment, for detecting different kinds of defects, for compensating for structures, markings, edges
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
- G01N21/89—Investigating the presence of flaws or contamination in moving material, e.g. running paper or textiles
- G01N21/892—Investigating the presence of flaws or contamination in moving material, e.g. running paper or textiles characterised by the flaw, defect or object feature examined
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Abstract
The embodiment of the disclosure discloses visual detection device of axle type product includes: a guide assembly having a guide channel; a drive assembly including a conveyor belt; the conveyor belt is positioned below the guide channel; the image acquisition assembly comprises a camera fixed above the guide assembly; the guide channel comprises an inclined channel part which is different from the conveying direction of the conveying belt, and the shaft product to be measured is driven by the conveying belt to rotate on the inclined channel part and is imaged by the camera. This technical scheme exposes the full surface outward appearance of axle type product in the field of vision scope of image acquisition subassembly, and then by camera acquisition image, has contained the full surface appearance information of axle type product in the image, can evaluate the outward appearance of axle type product comprehensively through image analysis, has realized the detection to the full surface outward appearance of axle type product, avoids the hourglass of the product of surface defect to examine, has improved the accuracy of detection.
Description
Technical Field
The utility model relates to a machine vision technical field, concretely relates to visual detection device of axle type product.
Background
The shaft products are subjected to nondestructive testing based on machine vision, and the feeding mode commonly used for a detection area is mainly divided into three main types: a robot device, a conveyor device, and a turntable device.
The manipulator device has the advantages of high flexibility, good universality and obvious defects, firstly, the manipulator base is fixed in position, the action range is very limited, secondly, the efficiency is low, the manipulator device is not suitable for the detection field with high speed requirement, and thirdly, the cost is high.
The conveyor belt feeding device has the advantages that the structure is simple, the cost is low, the detection speed can be 3-10 times that of a mechanical arm device, the disadvantages and shortcomings of the conveyor belt feeding device in the traditional sense are as follows, firstly, the type of the transparent conveyor belt is basically adopted, the product is subjected to size detection by placing the backlight below the transparent conveyor belt, the product is subjected to appearance detection by using few conveyor belts, secondly, the product is conveyed by basically selecting the narrower conveyor belt, the product is conveyed in a transverse long-distance conveying mode, the too-narrow and too-long conveyor belts are easy to loosen after long-time movement, the vertical vibration is obvious, the detection precision is influenced, and thirdly, the shaft type products are easy to roll and have instability.
The rotary disc device drives the product rotation detection device in a rotary disc mode, and has the advantages that the servo motor is used for positioning, higher mechanical positioning precision can be achieved, and the speed is higher than that of conveying of a conveying belt. The defects are also obvious, the detection precision is influenced by the position and the depth of the rotary table, the detection precision is influenced by the high-speed movement of a product on the rotary table, the general precision detection requirement cannot be met, and the multi-scale detection requirement cannot be met due to poor structural universality.
For shaft products, in order to realize the detection of the appearance of the whole surface of the product, the condition that the product rotates on a detection area needs to be met firstly. However, the conventional feeding detection device (the above-mentioned manipulator device, the conveyor device and the turntable device) cannot meet the specific condition of detecting the rotation of the product, so that the device manufactured based on the above-mentioned device can only complete the simple size detection of the product, and cannot detect the whole surface appearance of the shaft product.
Disclosure of Invention
In order to solve the problems in the related art, the embodiments of the present disclosure provide a visual inspection device for shaft products.
The embodiment of the disclosure provides a visual detection device for shaft products.
Specifically, the visual inspection device of axle type product includes:
a guide assembly having a guide channel;
a drive assembly including a conveyor belt; the conveyor belt is positioned below the guide channel;
the image acquisition assembly comprises a camera fixed above the guide assembly;
the guide channel comprises an inclined channel part which is different from the conveying direction of the conveying belt, and the shaft product to be measured is driven by the conveying belt to rotate on the inclined channel part and is imaged by the camera.
Optionally, the middle part of the guide channel is an inclined channel part, and at least one of the two end parts is a horizontal channel part which is the same as the conveying direction.
Optionally, the guide assembly comprises: a first guide plate and a second guide plate; a gap is formed between the first guide plate and the second guide plate to form the guide channel.
Optionally, the first guide plate comprises: an inlet width adjusting plate and a fixing plate; the second guide plate includes: an outlet width adjusting plate and a movable plate; the inlet width adjusting plate and the outlet width adjusting plate are respectively positioned at two ends of the guide channel;
wherein the inclined channel part is formed between the fixed plate and the movable plate; and/or
The inlet width adjusting plate and the movable plate form the horizontal channel part; and/or
The outlet width adjusting plate and the fixing plate form the horizontal passage portion.
Optionally, position adjusting holes are arranged on the inlet width adjusting plate, the outlet width adjusting plate and the movable plate, and the hole diameter of each position adjusting hole is larger than a fixing hole arranged on the driving assembly in a matching position.
Optionally, a plurality of protrusions are arranged on the side wall of the inclined channel part.
Optionally, the raised portion is located in the middle of the inclined channel portion.
Optionally, the raised portion is a serration.
Optionally, a chamfer is arranged on one side of the first saw tooth, which is contacted with the shaft product to be detected; the first saw teeth are saw teeth which are firstly contacted by the part, entering the inclined channel, of the shaft product to be detected.
Optionally, the method further comprises:
the sensor is arranged on the guide assembly and used for sending a feedback signal to the controller when detecting that the shaft product to be detected passes through, so that the controller sends an image acquisition instruction to the camera.
The technical scheme provided by the embodiment of the disclosure can have the following beneficial effects:
the visual inspection device of axle type product that this disclosed embodiment provided includes: a guide assembly having a guide channel; a drive assembly including a conveyor belt; the conveyor belt is positioned below the guide channel; the image acquisition assembly comprises a camera fixed above the guide assembly; the guide channel comprises an inclined channel part which is different from the conveying direction of the conveying belt, and the shaft product to be measured is driven by the conveying belt to rotate on the inclined channel part and is imaged by the camera. This technical scheme utilizes the conveyer belt to carry axle type product, axle type product moves in the direction passageway, through the different slope passageway part with the direction of delivery of conveyer belt, axle type product takes place to rotate in slope passageway part place region, thereby expose its full surface outward appearance at the field of vision scope of image acquisition subassembly, and then gather the image by the camera, the full surface outward appearance information of axle type product has been contained in the image, can evaluate the outward appearance of axle type product comprehensively through image analysis, the detection to axle type product full surface outward appearance has been realized, avoid the hourglass of the product of surface defect to examine, the rate of accuracy of detection has been improved.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.
Drawings
Other features, objects, and advantages of the present disclosure will become more apparent from the following detailed description of non-limiting embodiments when taken in conjunction with the accompanying drawings. In the drawings:
fig. 1 shows a schematic structural diagram of a visual inspection apparatus for shaft products according to an embodiment of the present disclosure;
FIG. 2 illustrates a schematic structural view of a steering assembly according to an embodiment of the present disclosure;
fig. 3 shows a schematic structural diagram of a drive assembly according to an embodiment of the present disclosure.
Detailed Description
Hereinafter, exemplary embodiments of the present disclosure will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily implement them. Also, for the sake of clarity, parts not relevant to the description of the exemplary embodiments are omitted in the drawings.
In the present disclosure, it is to be understood that terms such as "including" or "having," etc., are intended to indicate the presence of the disclosed features, numbers, steps, behaviors, components, parts, or combinations thereof, and are not intended to preclude the possibility that one or more other features, numbers, steps, behaviors, components, parts, or combinations thereof may be present or added.
It should be further noted that the embodiments and features of the embodiments in the present disclosure may be combined with each other without conflict. The present disclosure will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
For shaft products, in order to realize the detection of the appearance of the whole surface of the product, the condition that the product rotates on a detection area needs to be met firstly. However, the conventional feeding detection device (the above-mentioned manipulator device, the conveyor device and the turntable device) cannot meet the specific condition of detecting the rotation of the product, so that the device manufactured based on the above-mentioned device can only complete the simple size detection of the product, and cannot detect the whole surface appearance of the shaft product.
In view of the above defects, the visual inspection device for shaft products provided by the embodiment of the disclosure utilizes the conveyor belt to convey the shaft products, the shaft products move in the guide channel, pass through the inclined channel part different from the conveying direction of the conveyor belt, and rotate in the area of the inclined channel part, so that the full-surface appearance of the shaft products is exposed in the visual field range of the image acquisition assembly, and then the images are acquired by the camera, the full-surface appearance information of the shaft products is contained in the images, the appearance of the shaft products can be comprehensively evaluated through image analysis, the full-surface appearance of the shaft products is detected, the missing detection of the products with defective surfaces is avoided, and the accuracy of the detection is improved.
The details of the embodiments of the present disclosure are described in detail below with reference to specific embodiments.
Fig. 1 shows a schematic structural diagram of a visual inspection device for shaft products according to an embodiment of the present disclosure. As shown in fig. 1, the visual inspection apparatus 10 for shaft products includes: a guide assembly 11 having a guide channel a, a drive assembly 12 and an image acquisition assembly 13. Wherein the driving assembly 12 comprises a conveyor belt 121, said conveyor belt 121 being located below said guiding passage a. The image capturing assembly 13 includes a camera 131 fixed above the guide assembly 12. The guide path A includes an inclined path portion A different from the conveying direction of the conveyor belt 1211The shaft product P to be measured is driven by the conveyor belt 121 to be arranged on the inclined channel part a1Rotated and images are captured by the camera 131.
According to the embodiment of the present disclosure, the shaft-like product P to be measured is placed on the conveyor belt 121 and guided in the conveying direction by the guide channel a, and when the shaft-like product P to be measured (or called as product) is placed, the shaft-like product P is placed in a manner that the axial direction of the shaft-like product P is consistent with the conveying direction, and the shaft-like product P is placed in the inclined channel part a1In the region, the conveying direction of the shaft-like product P to be measured deviates from the axial direction, so that the product rotates under the driving force of the conveyor belt 121, and the inclined channel part a1The product is restricted in its range of motion so that it is not thrown off the conveyor 121. The shaft product P to be measured is arranged at the inclined channel part A1The area where the shaft product P to be detected is located rotates to expose the appearance surface of the shaft product P in contact with the conveyor belt 121, a plurality of images are collected through the camera 131, partial appearance of the product is shot through each image, the appearance of the whole surface of the shaft product P to be detected can be obtained by combining the images, and effective detection and identification of various appearance defects such as spots, rusts, scratches, pits, fingerprints and the like are achieved. Wherein, partial surface appearance of the product can be overlapped between different images so as to improve the accuracy of identifying appearance defects.
According to the embodiment of the present disclosure, the camera 131 is a high-resolution area-array camera, which is vertically disposed to face downward perpendicular to the guide member 11 and is located at the inclined passage portion a1Directly above the zone and at a distance from the guide assembly 11, for example p mm, to ensure the distance of the measuring camera 131 from the guide assembly 11 and the level and perpendicularity of the calibration camera 131, transversely parallel to the conveying direction of the conveyor belt 121.
The selected camera 131 satisfies a requirement that the maximum acquisition frame rate fr is greater than the number of images to be continuously acquired, and has a certain range of aperture adjustment capability. The shaft product P to be detected can not be missed excessively in appearance detection of the shot image, and the full-surface appearance recognition capability is stronger.
According to the embodiment of the present disclosure, the camera 131 is configured with the vision lens 132, the vision lens 132 adopts a long-focus, ultra-low distortion FA lens, and it is ensured that the image plane size of the selected lens is greater than or equal to the target plane size of the camera 131, so as to ensure the sufficient field of view.
For example, defining the length L of the shaft product P to be measured, the product is arranged at the inclined channel part A1The distance Lr, the working distance wd, the focal length f, the target surface width W, the target surface height H, the actual visual field width W and the actual visual field height H which advance when the zone rotates for one circle satisfy the formula：
wd/W＝f/w
wd/H＝f/h
On the premise of confirming that the actual view width W is L + Lr + Res (unit: mm), wd is calculated according to the above formula to obtain the proper lens placement height so that the product is within the lens view in the whole detection period. Res represents a redundant part reserved on the edge in the view width direction of the camera to ensure that the product is not close to the edge in the detection area, for example, the redundancy of 10mm on the edges of two sides is respectively, and the Res value is 20mm, so that an ideal detection effect can be achieved under the condition that the actual view width is as small as possible.
Due to the fact that the relation of the area-array camera is selected and the fact that the length of the shaft type product P to be detected is slightly long in the horizontal direction is adopted, the distortion problem of the edge area of the visual field is reduced by using the low-distortion lens, and therefore the product size detection precision is improved.
According to the embodiment of the disclosure, the middle part of the guide channel A is an inclined channel part A1(or ramp area), at least one of the two ends is a horizontal channel section in the same direction as the transport direction.
In the present disclosure, the shaft product P to be measured is conveyed from one side of the guide channel a to the other side, and the starting end of the conveying is a horizontal channel portion (or called an inlet straight rail region) which can ensure that the shaft product P to be measured is not rotated due to the fact that the axial direction of the shaft product P is consistent with the conveying direction when the shaft product P to be measured is placed, so that the risk of being thrown out from the conveyor belt 121 is reduced. Of course, the starting end of the conveying can also be set as an inclined channel by controlling the speed of the conveyor belt 121, the parameters of the camera 131, and other conditions, so that the overall surface appearance of the product can be detected, and the setting of the camera 131 can be more flexible, which is not limited by the disclosure.
In addition, the end point of the conveying can also be set to be a horizontal channel part (or called an outlet straight rail area), so that the shaft products can be collected without rotating and then subjected to subsequent treatment. Of course, the inclined channel may be provided according to practical situations, and the disclosure is not limited thereto.
The following describes in detail an embodiment of the guide passage a composed of an entrance straight track area, a ramp area, and an exit straight track area. It should be understood that this embodiment is illustrative and not limiting of the present disclosure.
Referring to fig. 2, the guiding assembly 11 includes: a first guide plate 111 and a second guide plate 112; the first guide plate 111 and the second guide plate 112 have a gap therebetween to form the guide passage a. Wherein, the first guide plate 111 and the second guide plate 112 have one side with a gap, and the guiding direction of the guide channel A is adjusted by adjusting the shape of the side walls of the two guide plates. As shown in fig. 2, an arrow indicates a conveying direction of the conveyor belt (schematically illustrated in a horizontal direction), the side walls of the first guide plate 111 and the second guide plate 112 are divided into three parts, two ends of the side walls are horizontal planes, and the middle part of the side walls is a curved surface, so that the guide passage a also comprises three parts, and an inlet straight rail area, an inclined rail area and an outlet straight rail area are formed in sequence from left to right.
With continued reference to fig. 2, in accordance with an embodiment of the present disclosure, the first guide plate 111 includes: an inlet width adjusting plate 111-A and a fixing plate 111-B; the second guide plate 112 includes: an outlet width adjusting plate 112-A and a movable plate 112-B; the inlet width adjusting plate 111-A and the outlet width adjusting plate 112-A are respectively positioned at two ends of the guide channel; wherein the inclined channel portion is formed between the fixed plate 111-B and the movable plate 112-B; and/or the horizontal passage portion is formed between the inlet width adjustment plate 111-a and the movable plate 112-B; and/or the horizontal passage portion is formed between the outlet width adjustment plate 112-a and the fixing plate 111-B.
In the present disclosure, the inlet width adjusting plate 111-a and the fixing plate 111-B are provided with mounting holes through which they are fixed to one side of the conveyor belt 121, and the outlet width adjusting plate 112-a is provided with mounting holes through which they are fixed to the other side of the conveyor belt 121. The inlet width adjusting plate 111-a, the outlet width adjusting plate 112-a and the movable plate 112-B are provided with position adjusting holes 113 having a diameter larger than that of fixing holes (not shown) provided at fitting positions on the driving assembly 12. The movable plate 112-B is fixed to the other side of the conveyor belt 121 through the position adjustment hole 113. The adjustment of the width of the straight rail area of the entrance is realized by adjusting the fixing position of the position adjusting hole 113 on the entrance width adjusting plate 111-A and/or the movable plate 112-B. The position of the fixed plate 111-B is kept still, the width of the inclined rail area is adjusted by adjusting the fixing position of the position adjusting hole 113 on the movable plate 112-B, and the width of the outlet straight rail area is adjusted by adjusting the fixing position of the position adjusting hole 113 on the outlet width adjusting plate 112-A.
According to an embodiment of the present disclosure, a straight track region length TL is defined, and a straight track region width TW. In general, the design and adjustment meet the following requirements:
3L<TL<3.5L
1.1L<TW<1.2L
the two pieces ensure that the quantity of the shaft products P to be detected which can be accumulated in the straight rail is proper and the products can move forwards stably at the straight rail.
There is no specific requirement to the turning radius and arc length of the track from the straight rail to the inclined rail or from the inclined rail to the straight rail, but the length of the inclined line after entering the inclined rail is required to be more than one product length, and the condition is used for completing the transition from the straight line to the inclined line of the shaft product P to be measured, namely stabilizing the gravity center and the moving direction of the product and preventing the phenomenon of continuous oscillation after entering the inclined rail area.
Specifically, a connecting line of a straight rail center straight line and a slant rail center straight line is intersected at one point, an intersection angle θ is defined, the speed V of the conveyor belt 121 from left to right, the speed Va of the shaft product P to be detected in the advancing direction of the slant rail, the rotation linear speed Vr and the rotation angular speed Wr of the shaft product P to be detected in the slant rail are obtained, the radius r of the shaft product P to be detected is equal to Dia/2, and Dia is the diameter. The following conditions are required to be satisfied:
Va＝Vcosθ
assuming that the product rotates normally for a full circle, it is satisfied
According to an embodiment of the present disclosure, the inclined channel portion a1The side wall of the bracket is provided with a plurality of convex parts. Through setting up the bellying, axle type product P that awaits measuring contacts with the bellying when rotating, like this in the image that the shooting obtained, the border of axle type product P size that awaits measuring can clearly be defined, has improved the detection precision of product size (for example length, diameter isoparametric). For example, when the camera is controlled to capture a first image, the end of the shaft product P to be detected is located at the concave position between the adjacent convex portions, and subsequently, when the image is processed, the position of the end can be accurately calibrated by using an image processing tool, and the detected dimensional accuracy is 0.01 mm.
According to an embodiment of the present disclosure, the protrusion is located at the inclined passage portion a1In the middle of (a). The shaft product P to be measured can enter the inclined rail area from the inlet straight rail area or enter the outlet straight rail area from the inclined rail area without the lug boss, and only the inclined channel part A is arranged1The middle part of the shaft product P to be detected is provided with the protruding part, the shaft product P to be detected completely enters the inclined rail area at the moment, the area provided with the protruding part can be used as the detection area of the appearance of the whole surface of the shaft product P to be detected, and the size and the appearance of the product can be detected simultaneously in the picture shot by the camera 131.
According to an embodiment of the present disclosure, the protrusions are serrations.
For example, the pitch Dt, the tooth length Lt, the tooth width Wt, and the tooth height Ht of each tooth on the same side of the protrusion setting region are defined, the tooth pitch Dtp on both sides of the protrusion setting region is defined, and the number of teeth of the saw teeth is defined as Nt. According to the product model, the above parameters are different, the follow-up image processing is influenced by considering that the number of teeth is too dense, the smooth transition of the product is influenced by the saw teeth to be easily clamped by considering that the number of the teeth is too sparse, and therefore the number of the saw teeth arranged in the length range of the shaft product P to be measured can be 5.
The following conditions may also be satisfied:
0.8L<Nt×Lt+(Nt-1)×Dt<L<Nt×Lt+(Nt+1)×Dt
the condition ensures that the left end and the right end of the product are just positioned at the tooth gaps, and provides convenience for measuring the total length. Meanwhile, the diameter can be measured in a four-section mode, and the diameter measurement precision is improved.
The following conditions may also be satisfied:
0.2Dt<Lt<0.4Dt
0.4Dia<Wt<0.5Dia
the condition is used for improving the light transmission quantity of incident light of the tooth gaps, so that the image of the detected product collected by the image collecting assembly is clear enough, and the diameter measurement is facilitated.
The following conditions may also be satisfied:
0.4Dia<Ht<0.5Dia
this condition serves to reduce potential interference of the two-sided plurality of teeth with the product surface without causing the product to fall out of the ramp area during rotation.
The following conditions may also be satisfied:
1.1L<Dtp<1.2L
this condition ensures both a steady rotation of the product in the detection zone and a controllability of the range of motion of the product.
According to the embodiment of the disclosure, one side of the first saw tooth, which is in contact with the shaft product to be detected, is provided with a chamfer; the first saw teeth are saw teeth which are firstly contacted by the part, entering the inclined channel, of the shaft product to be detected. The chamfer angle is arranged for weakening repeated impact on the saw teeth caused by a large number of products after bending, and meanwhile, the product vibration is reduced.
According to this disclosed embodiment, the visual inspection device of axle type product still includes: the sensor is arranged on the guide assembly and used for sending a feedback signal to the controller when detecting that the shaft product to be detected passes through, so that the controller sends an image acquisition instruction to the camera. Specifically, the sensor may be disposed at the position of the first sawtooth, and may also be disposed in the inlet straight rail region, which is not limited by this disclosure.
Referring to fig. 3, the driving assembly 12 further includes: stepping motor 122, motor base 123, shaft coupling 124, drive wheel 125, driven wheel 126, rear wall plate 127, front wall plate 128, bottom plate 129 and motor spacer 130. Wherein, motor cabinet 123 is used for fixed step motor 122, step motor 122 transmits the moment of torsion for action wheel 125 through shaft coupling 124, action wheel 125 is used for driving conveyer belt 121 to carry axle type product P that awaits measuring, conveyer belt 121 adopts the PVC material, stable in structure, the surface design is opaque white non-pattern type, follow driving wheel 126 and be used for passive drive conveyer belt 121 to remove and rotate, as the take-up pulley simultaneously, play the effect of constraint conveyer belt 121, guarantee that conveyer belt 121 can not become flexible. The rear wall plate 127 is used to restrain the rear edge region of the belt 121, the front wall plate 128 is used to restrain the front edge region of the belt, the bottom plate 129 serves to stabilize the entire drive assembly 12, and the motor block 130 is used to carry the motor mount 123.
According to an embodiment of the present disclosure, the stepper motor 122 employs a single type 60 two phase stepper motor, defining a torque T, requiring: t is more than 3 N.m as the lowest torque condition, which ensures that the motor can drive the conveyor belt to normally rotate and the conveyor belt and the coupling do not slide.
According to the embodiment of the present disclosure, a fixing hole is provided on the rear wall plate 127, and the outlet width adjustment plate 112-a and the movable plate 112-B are fixed to the rear wall plate.
According to an embodiment of the present disclosure, a fixing hole is provided on the front wall plate 128, and the inlet width adjustment plate 111-a and the fixing plate 111-B are fixed to the front wall plate.
The visual detection device for shaft products in the embodiment of the disclosure has at least the following advantages:
(1) the cost generated by using the linear array camera to perform appearance detection on shaft products is reduced.
(2) The problem of use area array camera to carry out outward appearance and size detection to axle type product is solved.
(3) The curved surface characteristic and the end face of the product are not damaged by using a special detection scheme, and the detection expandability is good.
(4) Resources on a camera and machinery are saved to a certain extent, and the cost of the device is greatly reduced.
(5) The whole scheme is simple, strong in universality and high in transmission speed.
(6) In the inclined rail area, except the influence of the upper and lower sawteeth, the detection precision is improved to a certain extent.
The foregoing description is only exemplary of the preferred embodiments of the disclosure and is illustrative of the principles of the technology employed. It will be appreciated by those skilled in the art that the scope of the invention in the present disclosure is not limited to the specific combination of the above-mentioned features, but also encompasses other embodiments in which any combination of the above-mentioned features or their equivalents is possible without departing from the inventive concept. For example, the above features and (but not limited to) the features disclosed in this disclosure having similar functions are replaced with each other to form the technical solution.
Claims (10)
1. A visual inspection device of axle type product characterized by, includes:
a guide assembly having a guide channel;
a drive assembly including a conveyor belt; the conveyor belt is positioned below the guide channel;
the image acquisition assembly comprises a camera fixed above the guide assembly;
the guide channel comprises an inclined channel part which is different from the conveying direction of the conveying belt, and the shaft product to be measured is driven by the conveying belt to rotate on the inclined channel part and is imaged by the camera.
2. The apparatus of claim 1, wherein the guide channel has a central portion which is an inclined channel portion and at least one of two end portions which is a horizontal channel portion in the same direction as the conveying direction.
3. The apparatus of claim 2, wherein the guide assembly comprises: a first guide plate and a second guide plate; a gap is formed between the first guide plate and the second guide plate to form the guide channel.
4. The apparatus of claim 3, wherein:
the first guide plate includes: an inlet width adjusting plate and a fixing plate; the second guide plate includes: an outlet width adjusting plate and a movable plate; the inlet width adjusting plate and the outlet width adjusting plate are respectively positioned at two ends of the guide channel;
wherein the inclined channel part is formed between the fixed plate and the movable plate; and/or
The inlet width adjusting plate and the movable plate form the horizontal channel part; and/or
The outlet width adjusting plate and the fixing plate form the horizontal passage portion.
5. The apparatus of claim 4, wherein the inlet width adjusting plate, the outlet width adjusting plate and the movable plate are provided with position adjusting holes having a diameter larger than that of fixing holes provided at fitting positions on the driving assembly.
6. A device according to any one of claims 1 to 5, wherein the side walls of the inclined channel portion are provided with a plurality of projections.
7. The apparatus of claim 6, wherein the raised portion is located in a middle of the inclined channel portion.
8. The device of claim 6, wherein the raised portion is serrated.
9. The device according to claim 8, wherein one side of the first saw tooth contacting the shaft product to be tested is provided with a chamfer; the first saw teeth are saw teeth which are firstly contacted by the part, entering the inclined channel, of the shaft product to be detected.
10. The apparatus of any one of claims 1-5, 7-9, further comprising:
the sensor is arranged on the guide assembly and used for sending a feedback signal to the controller when detecting that the shaft product to be detected passes through, so that the controller sends an image acquisition instruction to the camera.
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