Prefabricated potato chip defective product detecting and screening device based on machine vision

Abstract

The utility model belongs to the technical field of potato chip screening, and particularly relates to a prefabricated potato chip defective product detecting and screening device based on machine vision, which comprises a vibration feeding mechanism, a rolling conveying mechanism, a vision detecting mechanism and a defective product removing mechanism which are connected in sequence, wherein the vibration feeding mechanism is used for screening broken chips and preliminarily arranging postures of the chips, the rolling conveying mechanism is used for adjusting the positions and the postures of the chips, conveying the chips and enabling the chips to rotate, and the visual detection mechanism is used for photographing and detecting the surfaces of the rotated chips. And the defective product removing mechanism is used for removing the chips with defects on the surfaces. The device can be applied to a mechanical production line of frozen prefabricated French fries, and automation and production efficiency of production of the frozen prefabricated French fries are further improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of French fries screening, and in particular relates to a device for detecting and screening defective prefabricated French fries based on machine vision. Background Art

[0002] Frozen pre-made French fries are a kind of pre-made food that is frozen after being fried. Its production process involves the following steps: potato washing, peeling, cutting into strips, blanching, draining, frying, freezing and bagging. During the production process, due to quality problems of the potato raw materials themselves and process problems during the processing, the product will have various types of appearance defects such as green spots, brown spots, mildew, black spots, etc. The defective pre-made French fries with these appearance defects will not only affect product quality but also consumer health. A Chinese patent discloses a French fry vibration sorting and screening device, application number: 202321297073.2, which includes a sorting machine and a screening machine, the sorting machine includes a first support frame and a first vibration trough, the first vibration trough is connected to the first support frame by a vibration machine and a plurality of springs, and a plurality of sorting parts are arranged in the first vibration trough. The screening machine includes a second support frame, a second vibration trough, a collecting trough and a plurality of screens, the second vibration trough is connected to the second support frame by a vibrator and a plurality of springs, each of the screens is detachably fixed in the second vibration trough, and the collecting trough is detachably fixedly connected to the second support frame and is located below each of the screens. This patent can only screen out impurities, debris, etc. in French fries. As for the defects in the appearance of the French fries themselves, it mainly depends on manual screening, and manual inspection is highly subjective and will be affected by personal emotions, fatigue, light and other conditions, and the production cost is high, the inspection standards are not unified, and the inspection efficiency and automation are low, resulting in uncertainty in the inspection results, thereby restricting the production efficiency and reducing the quality of the product. Utility Model Content

[0003] The utility model aims to provide a device for detecting and screening defective prefabricated French fries based on machine vision, so as to solve the problems existing in the background technology.

[0004] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a device for detecting and screening defective prefabricated French fries based on machine vision, comprising a vibrating feeding mechanism, a rolling conveying mechanism, a visual inspection mechanism and a defective product rejection mechanism connected in sequence; wherein the vibrating feeding mechanism is used to screen out broken French fries and preliminarily arrange the posture of the French fries, the rolling conveying mechanism is used to adjust the position and posture of the French fries and convey the French fries while allowing the French fries to rotate, the visual inspection mechanism is used to take pictures and detect the surface of the rotating French fries, and the defective product rejection mechanism is used to reject French fries with surface defects.

[0005] Preferably, the vibrating feeding mechanism includes a vibrating support, a vibrating base plate, a vibrating screen plate and a lower hopper, the vibrating base plate is installed on the vibrating support through a spring, a vibrating motor is installed at the bottom of the vibrating base plate, the vibrating screen plate is installed on the vibrating base plate with a gap between it, the vibrating screen plate is composed of a number of semi-cylinders arranged at equal intervals, and the lower hopper is installed at the end of the vibrating screen plate.

[0006] Preferably, a plurality of diverter plates are installed on the vibrating screen plate.

[0007] Preferably, the rolling conveying mechanism includes a conveying bracket, a transmission sprocket, a transmission chain, a rolling cylinder, a conical friction wheel and a conical friction plate adjustment mechanism. The transmission sprocket is installed on the conveying bracket, the transmission chain is wrapped around the transmission sprocket, the two ends of several rolling cylinders are respectively connected to the side of the transmission chain, the conical friction wheel is fixed at the two ends of the rolling cylinder, and the conical friction plate adjustment mechanism cooperates with the conical friction wheel to make the conical friction wheel and the rolling cylinder rotate.

[0008] Preferably, the conical friction plate adjustment mechanism includes a conical friction plate, a compression spring, a U-shaped connecting plate, a lead screw, a sliding connecting plate, a rotating handle and a sliding guide column; the lower end of the compression spring is connected to the middle part of the conical friction plate, the conical friction plate is frictionally connected to the conical friction wheel, the upper part of the compression spring is connected to the lower part of the sliding connecting plate, the middle part of the sliding connecting plate is provided with a lead screw sleeve, the lead screw cooperates with the lead screw sleeve, the two ends of the sliding guide column are respectively fixed to the two ends of the U-shaped connecting plate, the sliding connecting plate is slidably cooperated with the sliding guide column, one end of the lead screw is connected to one end of the U-shaped connecting plate, and the other end is connected to the rotating handle through the other end of the U-shaped connecting plate.

[0009] Preferably, both ends of the conical friction plate are provided with guide arcs.

[0010] Preferably, the visual detection mechanism is located on one side of the conical friction plate adjustment mechanism, and the visual detection mechanism includes a dark box, a strip light source, a photoelectric sensor and a camera. The camera is fixed on a camera bracket, the camera bracket is fixed on the conveying bracket, the strip light source is fixed above the inside of the dark box, the dark box covers the camera inside, and the photoelectric sensor is located on the upper and lower surfaces of the rolling cylinder below the rolling conveying mechanism.

[0011] Preferably, the defective product rejection mechanism is located on one side of the dark box, and the defective product rejection mechanism includes a high-pressure nozzle and a defective product collection box. The high-pressure nozzle is distributed below the end of the rolling conveying mechanism, and the high-pressure gas ejected from the high-pressure nozzle passes through the gap between two adjacent rolling cylinders. The defective product collection box has an opening at the bottom, and the opening is located obliquely above the high-pressure nozzle.

[0012] Preferably, a residue collection box is provided below the conveying bracket, and a cleaning brush is provided above the residue collection box, and the cleaning brush is in contact with the rolling drum below.

[0013] Preferably, a limiting brush is provided above the conveying bracket, and the limiting brush is located in front of the conical friction plate adjustment mechanism.

[0014] The beneficial effect of the utility model is that the device can be applied to the mechanical production line of frozen prefabricated French fries, further improving the automation and production efficiency of the production of frozen prefabricated French fries. It can effectively reduce manual intervention, and the reduction of manual intervention also avoids the occurrence of food safety accidents. Compared with the traditional manual detection method, the present invention improves production efficiency and detection accuracy, and the human factor can be reduced as much as possible, thereby improving the safety of the company's food and ensuring the company's brand awareness. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a three-dimensional diagram of the utility model;

[0016] Figure 2 It is a structural schematic diagram of the vibration feeding mechanism in the utility model;

[0017] Figure 3 It is a structural schematic diagram of the rolling transmission mechanism in the utility model;

[0018] Figure 4 It is a partial enlarged view of the rolling transmission mechanism in the utility model;

[0019] Figure 5 It is a bottom-up stereoscopic diagram of the rolling transmission mechanism in the utility model;

[0020] Figure 6 It is a three-dimensional diagram of the conical friction plate adjustment mechanism in the utility model;

[0021] Figure 7 It is a sectional stereoscopic diagram of the visual inspection mechanism and the defective product rejection mechanism in the utility model. DETAILED DESCRIPTION

[0022] In the description of the present disclosure, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present disclosure.

[0023] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present disclosure, unless otherwise specified, "plurality" means two or more.

[0024] In the description of the present disclosure, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection, it can be a mechanical connection, an electrical connection, or a communication connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present disclosure can be understood according to specific circumstances.

[0025] The specific implementation of the utility model is described in detail below with reference to the accompanying drawings and preferred embodiments.

[0026] like Figure 1 As shown, the utility model discloses a device for detecting and screening defective prefabricated French fries based on machine vision, comprising a vibrating feeding mechanism 1, a rolling conveying mechanism 2, a visual inspection mechanism 3 and a defective product rejection mechanism 4 connected in sequence; wherein the vibrating feeding mechanism is used to screen out broken French fries and preliminarily arrange the posture of the prefabricated French fries, the rolling conveying mechanism is used to adjust the position and posture of the French fries and rotate the French fries while conveying them, the visual inspection mechanism is used to take photos of the surface of the rotating French fries for inspection, and the defective product rejection mechanism is used to reject French fries with surface defects.

[0027] like Figure 2 As shown, the vibrating feeding mechanism 1 includes a vibrating support 11, a vibrating bottom plate 12, a vibrating screen plate 13 and a lower hopper 14. The vibrating bottom plate is mounted on the vibrating support through a spring 15. A vibrating motor is mounted at the bottom of the vibrating bottom plate. The vibrating screen plate is mounted on the vibrating bottom plate with a gap between the vibrating screen plate and the vibrating screen plate. The vibrating screen plate is composed of a plurality of semi-cylinders arranged at equal intervals. The French fries will fall from the gaps between the semi-cylinders to the vibrating bottom plate. The lower hopper is mounted at the end of the vibrating screen plate. A plurality of diverter plates 16 are mounted on the vibrating screen plate to preliminarily disperse the French fries on the vibrating screen plate.

[0028] like Figure 3 and Figure 4As shown, the rolling conveying mechanism 2 includes a conveying bracket 21, a transmission sprocket 22, a transmission chain 23, a rolling drum 24, a conical friction wheel 25 and a conical friction plate adjustment mechanism 5. The transmission sprocket is installed on the conveying bracket, the transmission chain is wound around the transmission sprocket, the two ends of a plurality of the rolling drums are respectively connected to the side of the transmission chain, the conical friction wheel is fixed at the two ends of the rolling drum, and the conical friction plate adjustment mechanism cooperates with the conical friction wheel to make the conical friction wheel and the rolling drum rotate.

[0029] like Figure 5 As shown, a residue collection box 26 is provided below the conveying bracket to collect the residue dropped from the rolling drum, and a cleaning brush 27 is provided above the residue collection box. The cleaning brush contacts the rolling drum below to clean the rolling drum. A limiting brush 28 is provided above the conveying bracket, and the limiting brush is located in front of the conical friction plate adjustment mechanism.

[0030] like Figure 6 As shown, the conical friction plate adjustment mechanism 5 comprises a conical friction plate 51, a compression spring 52, a U-shaped connecting plate 53, a lead screw 54, a sliding connecting plate 55, a rotating handle 56 and a sliding guide column 57; the lower end of the compression spring is connected to the middle of the conical friction plate, and the two ends of the conical friction plate are provided with guide arcs. The conical friction plate is frictionally connected to the conical friction wheel, and the upper part of the compression spring is connected to the lower part of the sliding connecting plate. The friction preload force between the conical friction plate and the conical friction wheel can be adjusted by the compression spring. The middle part of the sliding connecting plate is provided with a lead screw sleeve 58, and the lead screw cooperates with the lead screw sleeve. The two ends of the sliding guide column are respectively fixed to the two ends of the U-shaped connecting plate, and the sliding connecting plate is slidably matched with the sliding guide column. One end of the lead screw is connected to one end of the U-shaped connecting plate, and the other end is connected to the rotating handle through the other end of the U-shaped connecting plate. The relative position of the conical friction plate and the conical friction wheel can be adjusted by rotating the lead screw with the handle.

[0031] like Figure 5 and Figure 7 As shown, the visual detection mechanism 3 is located on one side of the conical friction plate adjustment mechanism, and the visual detection mechanism includes a dark box 31, a strip light source 32, a camera 33, and a photoelectric sensor 34. The camera is fixed on a camera bracket, and the camera bracket is fixed on the conveying bracket. The strip light source is fixed above the inside of the dark box, and the dark box covers the camera inside. The photoelectric sensor is located on the upper and lower surfaces of the rolling drum under the rolling conveying mechanism. The camera can be controlled to collect images by counting the rolling drum through the photoelectric sensor.

[0032] like Figure 7As shown, the defective product rejection mechanism 4 is located on one side of the dark box, and the defective product rejection mechanism includes a high-pressure nozzle 41 and a defective product collection box 42. The high-pressure nozzle is distributed below the end of the rolling conveying mechanism, and the high-pressure gas ejected from the high-pressure nozzle passes through the gap between two adjacent rolling cylinders. The defective product collection box has an opening 43 at the bottom, and the opening is located obliquely above the high-pressure nozzle.

[0033] The features, structures or characteristics described in the present disclosure may be combined in one or more embodiments in any suitable manner. In the above description, many specific details are provided to provide a full understanding of the embodiments of the present disclosure. However, those skilled in the art will appreciate that the technical solutions of the present disclosure may be practiced without one or more of the specific details, or other methods, components, materials, etc. may be adopted. In other cases, known structures, materials or operations are not shown or described in detail to avoid blurring the various aspects of the present disclosure.

[0034] After being washed, peeled, and cut into strips, the potatoes can enter the vibrating feeding mechanism. The vibrating screen plate in the vibrating feeding mechanism is composed of semi-cylinders smaller than the diameter of the French fries arranged at equal intervals. The gaps between the semi-cylinders on the vibrating screen plate will screen out the broken French fries and enter the vibrating bottom plate below. At the same time, under the action of the vibration force, the vibrating screen plate will vibrate the complete French fries and spread them flat so that they are not stacked. After passing through the lower hopper, the French fries fall in the lower inclined plate of the lower hopper, hitting the inner wall of the lower hopper during the falling process. Under the action of gravity, the posture of the French fries will be initially adjusted, tending to be horizontal, and fall into the rolling conveyor mechanism.

[0035] The fries fall onto the rolling drum at one end of the rolling conveyor mechanism. The fries move forward with the rolling drum through the chain and the sprocket. One side of the conical friction plate is the rolling combing area, and the other side is the visual inspection area. The fries first enter the rolling combing area. The conical friction plate is pressed against the conical friction wheels at both ends of the rolling drum under the action of the spring preload. Through the friction between the two, the rolling drum will rotate while moving forward. Then the friction between the rotating rolling drum and the fries drives the fries to roll. The rolling fries will further adjust their posture until they fall into the gap between the two rolling drums. Then the fries move forward while rotating and enter the machine vision inspection area.

[0036] French fries are transported to the machine vision inspection area through the rolling combing area. The photoelectric sensor under the rolling conveyor mechanism counts the number of rolling drums within a certain period of time, thereby triggering the camera above the machine vision inspection area to collect images. As the rolling drum moves forward, the camera collects images of the French fries rotating in the area three times within a certain period of time. Each image collection includes at least 180°, and the French fries inspection can be completed. According to the characteristics of French fries, a white strip light source is selected, and the rolling drum is selected in white, which can make the target have a better imaging effect and improve the inspection accuracy.

[0037] After the prefabricated French fries pass through the image acquisition area, the software system will encode the position information of the defective French fries with appearance defects detected. Each detection channel corresponds to a high-pressure nozzle. The coded information of the detected defective products is transmitted to the single-chip microcomputer controller through the PC, which controls the high-pressure nozzle under the corresponding detection channel to spray high-pressure airflow, changing the movement trajectory of the defective prefabricated French fries and making them fall into the defective product collection box. Qualified prefabricated French fries naturally fall into the next production link.

[0038] It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the utility model, and these improvements and modifications should also be regarded as the protection scope of the utility model.

Claims

1. A device for detecting and screening defective prefabricated French fries based on machine vision, characterized in that: It includes a vibrating feeding mechanism, a rolling conveying mechanism, a visual inspection mechanism and a defective product rejection mechanism connected in sequence; wherein the vibrating feeding mechanism is used to screen out broken French fries and preliminarily arrange the posture of the French fries, the rolling conveying mechanism is used to adjust the position and posture of the French fries and convey the French fries while making the French fries rotate, the visual inspection mechanism is used to take pictures and detect the surface of the rotating French fries, and the defective product rejection mechanism is used to reject French fries with surface defects.

2. The device for detecting and screening defective prefabricated French fries based on machine vision according to claim 1, characterized in that: The vibrating feeding mechanism includes a vibrating support, a vibrating base plate, a vibrating screen plate and a lower hopper. The vibrating base plate is installed on the vibrating support through a spring. A vibrating motor is installed at the bottom of the vibrating base plate. The vibrating screen plate is installed on the vibrating base plate with a gap between the vibrating screen plate and the vibrating screen plate. The vibrating screen plate is composed of a plurality of semi-cylinders arranged at equal intervals. The lower hopper is installed at the end of the vibrating screen plate.

3. The device for detecting and screening defective prefabricated French fries based on machine vision according to claim 2, characterized in that: A plurality of diverter plates are installed on the vibrating screen plate.

4. The device for detecting and screening defective prefabricated French fries based on machine vision according to claim 1, characterized in that: The rolling conveying mechanism includes a conveying bracket, a transmission sprocket, a transmission chain, a rolling cylinder, a conical friction wheel and a conical friction plate adjustment mechanism. The transmission sprocket is installed on the conveying bracket, the transmission chain is wound around the transmission sprocket, the two ends of several rolling cylinders are respectively connected to the side of the transmission chain, the conical friction wheel is fixed at the two ends of the rolling cylinder, and the conical friction plate adjustment mechanism cooperates with the conical friction wheel to make the conical friction wheel and the rolling cylinder rotate.

5. The device for detecting and screening defective prefabricated French fries based on machine vision according to claim 4, characterized in that: The conical friction plate adjustment mechanism includes a conical friction plate, a compression spring, a U-shaped connecting plate, a lead screw, a sliding connecting plate, a rotating handle and a sliding guide column; the lower end of the compression spring is connected to the middle part of the conical friction plate, the conical friction plate is frictionally connected to the conical friction wheel, the upper part of the compression spring is connected to the lower part of the sliding connecting plate, the middle part of the sliding connecting plate is provided with a lead screw sleeve, the lead screw cooperates with the lead screw sleeve, the two ends of the sliding guide column are respectively fixed to the two ends of the U-shaped connecting plate, the sliding connecting plate is slidably matched with the sliding guide column, one end of the lead screw is connected to one end of the U-shaped connecting plate, and the other end is connected to the rotating handle with the other end passing through the U-shaped connecting plate.

6. The device for detecting and screening defective prefabricated French fries based on machine vision according to claim 5, characterized in that: Both ends of the conical friction plate are provided with guide arcs.

7. The device for detecting and screening defective prefabricated French fries based on machine vision according to claim 5, characterized in that: The visual detection mechanism is located on one side of the conical friction plate adjustment mechanism, and includes a dark box, a strip light source, a photoelectric sensor and a camera. The camera is fixed on a camera bracket, the camera bracket is fixed on the conveying bracket, the strip light source is fixed on the top of the dark box, the dark box covers the camera inside, and the photoelectric sensor is located on the upper and lower surfaces of the rolling cylinder below the rolling conveying mechanism.

8. The device for detecting and screening defective prefabricated French fries based on machine vision according to claim 7, characterized in that: The defective product rejection mechanism is located on one side of the dark box, and includes a high-pressure nozzle and a defective product collection box. The high-pressure nozzle is distributed below the end of the rolling conveying mechanism, and the high-pressure gas ejected from the high-pressure nozzle passes through the gap between two adjacent rolling cylinders. The defective product collection box has an opening at the bottom, and the opening is located obliquely above the high-pressure nozzle.

9. The device for detecting and screening defective prefabricated French fries based on machine vision according to claim 4, characterized in that: A residue collection box is provided below the conveying bracket, and a cleaning brush is provided above the residue collection box. The cleaning brush contacts the rolling cylinder below.

10. The device for detecting and screening defective prefabricated French fries based on machine vision according to claim 4, characterized in that: A limiting brush is arranged above the conveying bracket, and the limiting brush is located in front of the conical friction plate adjusting mechanism.

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