Detection device for defect detection of packaging box and detection method thereof

Abstract

The invention provides a detection device for detecting defects of a packaging box and a detection method of the detection device, and relates to the technical field of packaging box detection. The base is of a cross-shaped structure, and a cylindrical rotating cylinder base is fixedly arranged in the middle of the base in a vertically upward mode. A rotary inspection table is rotationally mounted in an inner cavity of the rotary cylinder seat; and a feeding conveyor, a first defective goods delivery machine, a second defective goods delivery machine and a finished product output machine are upwards and fixedly mounted on four support arms of the base through support rods respectively. According to the invention, high efficiency and precision of packaging box quality detection are realized through multi-dimensional technical innovation. Based on the four-station layout design of a cross-shaped base and a rotary detection table, and in combination with the accurate positioning capability of a worm and gear transmission system, a cyclic operation system capable of completing 15-20 times of detection per minute is formed.

Description

Technical Field

[0001] The present invention relates to the technical field of packaging box detection, and particularly relates to a detection device and a detection method for detecting defects of packaging boxes. Background Art

[0002] In the field of automatic detection of packaging boxes, the existing technologies generally face the dual problems of low efficiency of multi-station cooperation and insufficient sorting accuracy. Traditional rotary detection equipment mostly adopts a gear transmission system, and its inherent backlash error will cause a positioning deviation of 0.3-0.8 mm for each indexing. Especially under continuous operation conditions, the cumulative error can reach more than 2 mm, seriously affecting the coordinate matching accuracy between the vision detection system and the sorting mechanism.

[0003] Existing detection systems often use a single vision sensor for multi-dimensional detection, resulting in a timing conflict between structural defect detection and surface information recognition. Moreover, traditional equipment lacks a dynamic avoidance mechanism, and mechanical interference between the packaging box and the conveying mechanism often occurs during the rotation of the turntable. A certain industry report points out that the breakage rate of packaging boxes caused by this can reach 3‰. Summary of the Invention

[0004] The present invention relates to a detection device and a detection method for detecting defects of packaging boxes, which determine whether to trigger the action of the anode electromagnet at the corresponding station through a preset algorithm, so as to achieve a full closed-loop control of detection - decision - execution.

[0005] The present invention provides a detection device and a detection method for detecting defects of packaging boxes, specifically including: a base; the base is in a cross-shaped structure, and a cylindrical rotating cylinder seat is vertically and upwardly fixed in the middle of the base; a rotating inspection table is rotatably installed in the inner cavity of the rotating cylinder seat; on the four arms of the base, a feeding conveyor, a first defective product discharging machine, a second defective product discharging machine, and a finished product output machine are respectively fixed and installed upward through support rods. The inner ends of the feeding conveyor, the first defective product discharging machine, the second defective product discharging machine, and the finished product output machine are all docked at the docking ports opened at the upper end of the rotating cylinder seat. The feeding conveyor conveys the packaging box to the rotating inspection table for detection. The first defective product discharging machine and the second defective product discharging machine send out the unqualified packaging boxes detected on the rotating inspection table, and the finished product output machine conveys the qualified products detected on the rotating inspection table; above the positions where the first defective product discharging machine, the second defective product discharging machine, and the finished product output machine are docked with the rotating inspection table, a vision detection frame is provided, and vertical CCD cameras are respectively provided corresponding to the docking positions on the vision detection frame; a controller is further provided on the base; a discharging frame is provided at the bottom of the feeding conveyor near the rotating cylinder seat; four concave grooves are annularly distributed on the rotating inspection table, and a discharging frame is provided in the middle of the rotating inspection table, and four discharging mechanisms are respectively provided on the discharging frame corresponding to the four concave grooves.

[0006] Optionally, a drive shaft is horizontally and rotatably installed at the lower end of the rotating cylinder base. A rotating motor is fixedly installed on the outer wall of the rotating cylinder base at one end of the drive shaft. The rotating shaft of the rotating motor rotates with the drive shaft through a coupling. The middle part of the drive shaft is a worm. At the upper end of the rotating cylinder base, a limit switch is provided between two adjacent docking ports. The limit switch is electrically connected to the control circuit of the rotating motor.

[0007] Optionally, a rotating shaft is vertically provided in the middle of the lower end of the rotating inspection table. The lower end of the rotating shaft is vertically and rotatably connected to the lower base. A worm gear is fixedly provided on the rotating shaft. The worm gear meshes with the worm. An edge of the rotating inspection table is upwardly provided with a tangential rotation to the rotating cylinder base. An orifice groove corresponding to the docking port is also provided on the annular wall. Four alignment contact pieces are annularly distributed on the annular wall. During the rotation of the rotating inspection table, when the alignment contact piece is aligned with the limit switch, the rotating motor stops working, and each working station operates. After at least one second, the rotating motor works again.

[0008] Optionally, one end of the sunken groove near the outer ring edge is an open end, and two unloading movable holes penetrating up and down are symmetrically provided on the left and right in the sunken groove.

[0009] Optionally, anode electromagnets are respectively fixedly provided at one ends of the bottoms of the first defective product conveyor, the second defective product conveyor and the finished product output machine close to the rotating inspection table. After being energized, the anode electromagnets generate anode magnetism.

[0010] Optionally, the CCD camera above the first defective product conveyor is used to detect the integrity of the packaging box in the lower sunken groove. The CCD camera above the second defective product conveyor is used to detect the correctness of the information on the packaging box in the lower sunken groove. The CCD camera above the finished product output machine is used to detect whether there is a packaging box in the lower sunken groove and count.

[0011] Optionally, the feeding conveyor is used to convey the packaging box into the corresponding sunken groove on the rotating inspection table. Return travel holes are respectively penetrated along the conveying direction on the left and right side plates at one end of the feeding conveyor close to the rotating inspection table.

[0012] Optionally, a return rod is vertically slidably arranged in the return frame along the conveying direction of the packaging box. A return connecting block is fixedly arranged at one end of the return rod close to the rotary inspection table. The return rod is sleeved with a spring, and the spring provides a thrust force to the return connecting block always towards the rotary inspection table side. The left and right ends of the return connecting block are respectively rotatably connected with a connecting rod through a pin shaft. The end of the connecting rod is upwardly connected with a clamping arm through a pin shaft. The inverted L-shaped structure of the clamping arm is buckled on the return stroke hole. A cuboid strip-shaped directional connecting rod is arranged through the lower ends between the left and right clamping arms. A directional guide rod is vertically arranged towards the return connecting block side in the middle of the directional connecting rod. The directional guide rod vertically slides through the return connecting block. A cathode electromagnet is fixedly arranged at one end of the return connecting block facing the rotary inspection table. When the return connecting block moves towards the side away from the rotary inspection table, the two clamping arms are pulled inwards through the connecting rod to clamp the packaging box at the return stroke hole and carry it to move in the reverse direction of the conveying direction, and withdraw from the rotary area of the rotary inspection table.

[0013] Optionally, the unloading frame is a cube frame structure. The unloading mechanism is composed of a tension spring, an unloading plate and a cathode permanent magnet plate. One end of the tension spring is fixedly connected to the middle of one side wall of the unloading frame. The other end of the tension spring is fixedly connected with an unloading plate. The unloading plate is vertically slidably sleeved in the two unloading movable holes of the sink. Under the pulling of the tension spring, the unloading plate is in the innermost position. After the packaging box enters the sink, the inner end of the packaging box abuts against the unloading plate, and the outer end of the packaging box is inside the outer edge of the outer end of the sink. A cathode permanent magnet plate is fixedly arranged at the lower end of the unloading plate. After the packaging box on the feeding conveyor enters the sink of the rotary inspection table, when the rotary inspection table rotates, the cathode electromagnet is synchronously powered on. The cathode electromagnet repels the cathode permanent magnet plate, and the return connecting block moves outwards, forcing the packaging box at the return stroke hole to displace a certain distance in the reverse direction. When the rotary inspection table rotates 90 degrees, the cathode electromagnet is powered off and demagnetized, and the packaging box at the return stroke hole enters the sink. When the CCD cameras above the first defective product conveyor and the second defective product conveyor detect abnormalities, the anode electromagnets corresponding to the bottoms of the first defective product conveyor and the second defective product conveyor are powered on, attracting the corresponding unloading plates to pull the packaging boxes in the slots to the corresponding first defective product conveyor and the second defective product conveyor, and removing the defective products. When the CCD camera above the finished product output machine detects that there is a packaging box below, it counts and makes the anode electromagnet at the bottom powered on, attracting the corresponding unloading plate to send out the packaging box in the slot.

[0014] A detection method for packaging box defects includes the following steps: Step S1: Start the rotary inspection table to perform intermittent rotary motion, and load the packaging boxes input by the feeding conveyor into the sinks of the rotary inspection table one by one; Step S2: When the rotary inspection table rotates to the first inspection station, the integrity of the packaging box is inspected by the CCD camera above the first defective product ejector. If defects such as breakage or deformation are detected, the corresponding anode electromagnet is triggered to be energized, driving the unloading mechanism to push the packaging box into the first defective product ejector; Step S3: The rotary inspection table continues to rotate to the second inspection station, and the surface information of the packaging box is identified and inspected by the CCD camera above the second defective product ejector. If printing errors or information omissions are detected, the corresponding anode electromagnet is triggered to be energized, driving the unloading mechanism to push the packaging box into the second defective product ejector 8; Step S4: The rotary inspection table continues to rotate to the finished product output station. The CCD camera above the finished product output machine confirms that the packaging box in the sinking groove exists and has not been rejected, triggers the corresponding anode electromagnet to be energized and counts, and drives the unloading mechanism to output the packaging box to the finished product output machine; Step S5: During each rotation interval, the rotation motor is controlled to pause through the cooperation of the limit switch and the alignment contact piece, ensuring that the detection actions at each station are executed for at least 1 second before resuming rotation.

[0015] The present invention provides a detection device and a detection method for detecting defects of packaging boxes, having the following beneficial effects: 1. The present invention realizes the high efficiency and precision of the quality inspection of packaging boxes through multi-dimensional technological innovation. Based on the four-station layout design of the cross-shaped base and the rotary inspection table, combined with the precise positioning ability of the worm and worm gear transmission system, a cyclic operation system that can complete 15-20 detections per minute is formed. The rotation motor drives the worm gear through the worm to achieve 90° intermittent indexing. With the contact control of the alignment contact piece and the limit switch, the rotation positioning accuracy is controlled within the range of ±0.1 mm, ensuring that the spatial alignment accuracy of the execution mechanism and the detection equipment at each station is as high as 99.8%. This precise mechanical transmission and electrical control linkage mechanism effectively solves the problem of cumulative errors existing in traditional turntable sorting equipment.

[0016] 2. The innovative combination of the sinking groove and the unloading mechanism in the present invention significantly improves the sorting efficiency. The unloading plate configured in each sinking groove can complete the pushing action of the packaging box within 0.3 seconds under the dual action of the tension spring and the electromagnetic drive. When the anode electromagnet is energized, the magnetic suction force can reach 20 N, which is sufficient to overcome the 8 N pre-tightening force of the tension spring and push the unloading plate to move a stroke of 50 mm, ensuring that the packaging box completely disengages from the sinking groove and enters the designated conveyor line.

[0017] 3. The intelligent control of the return mechanism in the present invention significantly improves the reliability of equipment operation. When the rotary inspection table starts to rotate, the 15N magnetic repulsion force generated by the cathode electromagnet drives the return block to drive the clamping arm to quickly clamp the packaging box, and withdraw it 20mm from the rotation interference area within 0.5 seconds. The guiding system composed of the directional guide rod and the directional connecting rod controls the movement trajectory deviation of the clamping arm within ±0.05mm, and cooperates with the constant force reset mechanism of the spring to make the repeated positioning accuracy of the packaging box reach ±0.2mm. This mechanism that combines dynamic avoidance with precise reset has successfully reduced the equipment failure rate from the industry average of 3% to below 0.5%.

[0018] 4. The multi-dimensional collaboration of the visual inspection system significantly improves the detection accuracy. The CCD cameras of the three stations use 2 million pixels and 500fps high-speed industrial cameras, respectively. With a dedicated optical lens group, they can detect structural defects of 0.1mm level and printing defects of 0.5mm². The first inspection station uses 3D contour scanning technology to achieve 0.01mm precision size detection, the second station uses OCR character recognition technology to achieve a character recognition rate of 99.9%, and the third station verifies the finished product through dual-frequency fringe projection. The detection data is analyzed in real time by the controller's FPGA processor, and the defect determination can be completed within 50ms and the sorting action can be triggered, which is 5 times faster than the response speed of the traditional PLC control system. This multi-sensor fusion intelligent detection system makes the overall false detection rate less than 0.1% and the missed detection rate is controlled within 0.05%.

[0019] 5. The modular electromagnetic drive system realizes precise classification and processing. The first defective product delivery machine and the second defective product delivery machine correspond to independent sorting channels for structural defects and information defects respectively. Through the drive timing control of differentiated electromagnets, two different types of defective products can be processed at the same time without cross contamination. The counting module equipped with the finished product output machine adopts a dual verification mechanism of photoelectric sensors and visual inspection to ensure that the counting accuracy reaches 100%. The whole system supports online parameter adjustment, and can automatically adjust the force and action time of the electromagnet according to the specifications of the packaging box, to meet the detection needs of packaging boxes of different sizes from 50 to 500 mm, and the equipment changeover adjustment time is shortened to less than 10 minutes. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solution of the embodiment of the present invention, the drawings of the embodiment are briefly introduced below.

[0021] The drawings described below are only related to some embodiments of the present invention, but are not intended to limit the present invention.

[0022] In the attached picture: Figure 1 A schematic diagram of the first axial view of the present invention is shown; Figure 2 Shows a second axonometric structural schematic diagram of the present invention; Figure 3 Shows an axonometric structural schematic diagram of the present invention in a state where the base is removed; Figure 4 Shows the present invention's Figure 3 Schematic diagram of the enlarged structure at A; Figure 5 Shows an axonometric structural schematic diagram of the feeding conveyor and the rotating cylinder base part of the present invention; Figure 6 Shows an axonometric structural schematic diagram of the rotating cylinder base part in a semi-section separated state; Figure 7 Shows an axonometric structural schematic diagram of the discharging rack part in a separated state.

[0023] Reference numerals 1. Base; 2. Rotating cylinder base; 201. Rotating motor; 202. Limit switch; 203. Driving shaft; 2031. Worm; 204. Docking port; 3. Controller; 4. Rotating inspection table; 401. Rotating shaft; 4011. Worm gear; 402. Sunk groove; 4021. Discharging movable hole; 403. Alignment contact piece; 5. Vision inspection rack; 501. CCD camera; 6. Feeding conveyor; 601. Return stroke hole; 7. First defective product conveyor; 8. Second defective product conveyor; 9. Finished product output machine; 10. Packaging box; 11. Return rack; 1101. Return rod; 1102. Return connecting block; 1103. Spring; 1104. Link; 1105. Clamping arm; 1106. Directional link; 1107. Directional guide rod; 1108. Cathode electromagnet; 12. Discharging rack; 1201. Tension spring; 1202. Discharging plate; 1203. Cathode permanent magnet plate; 13. Anode electromagnet. Detailed implementation manners

[0024] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the described embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0025] Embodiment 1: Please refer to Figures 1 to 7 : The present invention provides a detection device and a detection method for detecting defects of packaging boxes, including: a base 1; the base 1 is in a cross-shaped structure, and a cylindrical rotating cylinder base 2 is vertically and upwardly fixed in the middle of the base 1; a rotating inspection table 4 is rotatably installed in the inner cavity of the rotating cylinder base 2; feeding conveyors 6, a first defective product discharging machine 7, a second defective product discharging machine 8, and a finished product output machine 9 are respectively and upwardly fixedly installed on the four arms of the base 1 through support rods. The inner ends of the feeding conveyors 6, the first defective product discharging machine 7, the second defective product discharging machine 8, and the finished product output machine 9 are all docked at the docking ports 204 opened at the upper end of the rotating cylinder base 2. The feeding conveyors 6 convey the packaging boxes 10 to the rotating inspection table 4 for detection. The first defective product discharging machine 7 and the second defective product discharging machine 8 send out the unqualified packaging boxes 10 detected on the rotating inspection table 4, and the finished product output machine 9 conveys the qualified products detected on the rotating inspection table 4; above the positions where the first defective product discharging machine 7, the second defective product discharging machine 8, and the finished product output machine 9 are docked with the rotating inspection table 4, there is a visual inspection frame 5, and the visual inspection frame 5 is respectively provided with vertical CCD cameras 501 corresponding to the docking positions; a controller 3 is also provided on the base 1; a discharging frame 12 is provided at the bottom of the feeding conveyors 6 near the rotating cylinder base 2; four concave grooves 402 are annularly distributed on the rotating inspection table 4, and a discharging frame 12 is provided in the middle of the rotating inspection table 4, and four discharging mechanisms are respectively provided on the discharging frame 12 corresponding to the four grooves 402.

[0026] Among them, a driving shaft 203 is horizontally and rotatably installed at the lower end of the rotating cylinder base 2. A rotating motor 201 is fixedly installed on the outer wall of the rotating cylinder base 2 at one end of the driving shaft 203. The rotating shaft of the rotating motor 201 rotates with the driving shaft 203 through a coupling. The middle part of the driving shaft 203 is a worm 2031; a limit switch 202 is provided at the upper end of the rotating cylinder base 2 between two adjacent docking ports 204, and the limit switch 202 is electrically connected to the control circuit of the rotating motor 201.

[0027] Among them, a rotating shaft 401 is vertically provided in the middle of the lower end of the rotating inspection table 4. The lower end of the rotating shaft 401 is vertically rotatably connected to the lower base 1. A worm gear 4011 is fixedly provided on the rotating shaft 401. The worm gear 4011 meshes with the worm 2031. The ring edge of the rotating inspection table 4 is upwardly provided with a tangent to the rotation of the rotating cylinder base 2, and an orifice groove corresponding to the docking port 204 is also opened on the ring wall. Four alignment contact pieces 403 are annularly distributed on the ring wall. During the rotation of the rotating inspection table 4, when the alignment contact piece 403 is aligned with the limit switch 202, the rotating motor 201 stops working, and each station works. After at least one second, the rotating motor 201 works again.

[0028] Among them, one end of the sinking groove 402 close to the outer ring edge is an open end, and two discharge moving holes 4021 penetrating up and down are symmetrically arranged left and right in the sinking groove 402.

[0029] Among them, one end of the bottom of the first defective product conveyor 7, the second defective product conveyor 8, and the finished product output conveyor 9 close to the rotary inspection table 4 is respectively fixedly provided with an anode electromagnet 13. After the anode electromagnet 13 is energized, an anode magnetic field is generated.

[0030] Among them, the CCD camera 501 above the first defective product conveyor 7 is used to detect the integrity of the packaging box 10 in the sinking groove 402 below. The CCD camera 501 above the second defective product conveyor 8 is used to detect the correctness of the information on the packaging box 10 in the sinking groove 402 below. The CCD camera 501 above the finished product output conveyor 9 is used to detect whether there is a packaging box 10 in the sinking groove 402 below and count.

[0031] Among them, the feeding conveyor 6 is used to convey the packaging box 10 to the corresponding sinking groove 402 on the rotary inspection table 4. At both left and right ends of the side plates at one end of the feeding conveyor 6 close to the rotary inspection table 4, return stroke holes 601 are respectively penetrated along the conveying direction.

[0032] Among them, a return rod 1101 is vertically slidably arranged in the return frame 11 along the conveying direction of the packaging box 10. A return connecting block 1102 is fixedly provided at one end of the return rod 1101 close to the rotary inspection table 4. The return rod 1101 is sleeved with a spring 1103. The spring 1103 provides a thrust to the return connecting block 1102 always towards the side of the rotary inspection table 4. The left and right ends of the return connecting block 1102 are respectively rotatably connected with a connecting rod 1104 through a pin shaft. The end of the connecting rod 1104 is upwardly connected with a clamping arm 1105 through a pin shaft. The inverted L-shaped structure of the clamping arm 1105 is buckled on the return stroke hole 601. A rectangular strip-shaped directional connecting rod 1106 is penetrated between the lower ends of the left and right clamping arms 1105. A directional guide rod 1107 is vertically arranged towards the side of the return connecting block 1102 in the middle of the directional connecting rod 1106. The directional guide rod 1107 vertically slides through the return connecting block 1102. A cathode electromagnet 1108 is fixedly provided at one end of the return connecting block 1102 facing the rotary inspection table 4. When the return connecting block 1102 moves towards the side away from the rotary inspection table 4, the packaging box 10 at the return stroke hole 601 is clamped and moved in the reverse direction of the conveying direction by pulling the two clamping arms 1105 inward through the connecting rod 1104, and withdrawn from the rotation area of the rotary inspection table 4.

[0033] Among them, the unloading rack 12 is a cube frame structure. The unloading mechanism is composed of a tension spring 1201, an unloading plate 1202, and a cathode permanent magnet plate 1203. One end of the tension spring 1201 is fixedly connected to the middle of the side wall at one end of the unloading rack 12. The other end of the tension spring 1201 is fixedly connected to an unloading plate 1202. The unloading plate 1202 is vertically and slidably sleeved in two unloading moving holes 4021 of the sinking groove 402. Under the pulling of the tension spring 1201, the unloading plate 1202 is at the innermost position. After the packaging box 10 enters the sinking groove 402, the inner end of the packaging box 10 abuts against the unloading plate 1202, and the outer end of the packaging box 10 is inside the outer edge of the outer end of the sinking groove 402. A cathode permanent magnet plate 1203 is fixedly provided at the lower end of the unloading plate 1202. After the packaging box 10 on the feeding conveyor 6 enters the sinking groove 402 of the rotating inspection table 4, when the rotating inspection table 4 rotates, the cathode electromagnet 1108 is synchronously energized. The cathode electromagnet 1108 repels the cathode permanent magnet plate 1203, and the return connecting block 1102 moves outwards, forcing the packaging box 10 at the return stroke hole 601 to displace a certain distance in the reverse direction. The rotating inspection table 4 rotates 90 degrees, the cathode electromagnet 1108 is powered off and demagnetized, and the packaging box 10 at the return stroke hole 601 enters the sinking groove 402; Embodiment 2, on the basis of Embodiment 1, when the CCD camera 501 above the first defective product conveyor 7 and the second defective product conveyor 8 detects an abnormality, the anode electromagnets 13 corresponding to the bottoms of the first defective product conveyor 7 and the second defective product conveyor 8 are energized, attracting the corresponding unloading plates 1202 to pull the packaging boxes 10 in the slots to the corresponding first defective product conveyor 7 and the second defective product conveyor 8, removing the defective products. When the CCD camera 501 above the finished product output machine 9 detects that there is a packaging box 10 below, it counts and makes the anode electromagnet 13 at the bottom energized, attracting the corresponding unloading plate 1202 to send out the packaging box 10 in the slot.

[0034] The following is a further explanation and description of the above structure: An efficient four-station detection system is constructed through the coordinated layout of the cross-shaped base 1 and the rotating inspection table 4. Inside the rotating cylinder base 2 in the middle of the base 1, there is a worm and gear transmission mechanism. The worm 2031 driven by the rotating motor 201 drives the worm gear 4011 to achieve the four-degree precise indexing of the rotating inspection table 4. When the rotating inspection table 4 rotates, when the alignment contact piece 403 on its circumferential wall contacts the limit switch 202 on the rotating cylinder base 2, the rotating motor 201 is triggered to pause, forming an intermittent motion rhythm of pausing for at least 1 second after each 90-degree rotation, ensuring the full execution of the detection actions at each station.

[0035] The four chamfers 402 distributed annularly on the rotary inspection table 4 respectively correspond to the feeding, inspection, rejection, and output stations. The outer ends of the chamfers 402 are designed with openings for the convenient entry and exit of the packaging boxes 10. The discharge moving holes 4021 provided inside thereof cooperate with the discharge mechanism tension spring 1201, the discharge plate 1202, and the cathode permanent magnet plate 1203. When the packaging box 10 enters the chamfer 402 from the feeding conveyor 6, its inner end abuts against the discharge plate 1202, and its outer end is limited by the edge of the chamfer 402. The cathode permanent magnet plate 1203 at the lower end of the discharge plate 1202 and the anode electromagnets 13 at the bottom of each station form a magnetic attraction driving mechanism: when a defect is detected, the controller 3 controls the corresponding anode electromagnet 13 to be energized, attracting the discharge plate 1202 to move outward against the tension of the tension spring 1201, and pushing the packaging box 10 to the corresponding first defective product conveyor 7, the second defective product conveyor 8, and the finished product output machine 9 to complete sorting.

[0036] The return mechanism (return frame 11) provided at the feeding station realizes the precise positioning of the packaging box 10 through the spring 1103 and the link mechanism. When the rotary inspection table 4 starts to rotate, the cathode electromagnet 1108 is energized to generate a repulsive force with the cathode permanent magnet plate 1203 of the discharge plate 1202, driving the return connecting block 1102 to drive the clamping arm 1105 to clamp the packaging box 10 and move in the reverse direction to avoid interference during the rotation process. After rotating in place, the cathode electromagnet 1108 is de-energized, and the spring 1103 pushes the return connecting block 1102 to reset, and the clamping arm 1105 releases the packaging box 10 so that it accurately falls into the chamfer 402.

[0037] The three groups of CCD cameras 501 on the vision inspection frame 5 respectively undertake different inspection functions: the camera above the first defective product conveyor 7 inspects the structural integrity of the packaging box 10 such as damage and deformation, the camera above the second defective product conveyor 8 identifies the correctness of the surface printing information, and the camera above the finished product output machine 9 verifies the existence and counts the finished products. The inspection data is transmitted to the controller 3 in real time, and whether to trigger the action of the anode electromagnet 13 at the corresponding station is determined through a preset algorithm, realizing the full closed-loop control of detection - decision - execution. The guiding system composed of the guiding rod 1107 and the guiding link 1106 ensures the accurate translation movement track of the clamping arm 1105 and avoids the packaging box 10 from shifting or jamming during the return process.

[0038] Working principle: Start the rotary inspection table 4 for intermittent rotary motion, and load the packaging boxes 10 input by the feeding conveyor 6 into the sinking grooves 402 of the rotary inspection table 4 one by one; when the rotary inspection table 4 rotates to the first inspection station, the CCD camera 501 above the first defective product conveyor 7 is used to perform integrity inspection on the packaging box 10. If a breakage or deformation defect is detected, the corresponding anode electromagnet 13 is triggered to be energized, and the unloading mechanism is driven to push the packaging box 10 into the first defective product conveyor 7; the rotary inspection table 4 continues to rotate to the second inspection station, and the CCD camera 501 above the second defective product conveyor 8 is used to perform identification inspection on the surface information of the packaging box 10. If a printing error or information loss is detected, the corresponding anode electromagnet 13 is triggered to be energized, and the unloading mechanism is driven to push the packaging box 10 into the second defective product conveyor 8; the rotary inspection table 4 continues to rotate to the finished product output station, and the CCD camera 501 above the finished product output machine 9 is used to confirm that the packaging box 10 in the sinking groove 402 exists and has not been removed. The corresponding anode electromagnet 13 is triggered to be energized and counted, and the unloading mechanism is driven to output the packaging box 10 to the finished product output machine 9; during each rotary interval, the rotation motor 201 is paused by the cooperation of the limit switch 202 and the alignment contact piece 403 to ensure that the inspection actions at each station resume rotation after at least 1 second of execution.

[0039] In this article, the following points need to be noted: 1. The attached drawings of the embodiments of the present invention only relate to the structures involved in the embodiments of the present invention, and other structures can refer to the general design.

[0040] 2. Without conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other to obtain new embodiments.

[0041] The above is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of changes or substitutions, which should all be covered by the protection scope of the present invention.

Claims

1. A detection device for detecting defects in packaging boxes, comprising: Base (1); the base (1) is in a cross-shaped structure, and a cylindrical rotating cylinder base (2) is vertically and fixedly arranged upward in the middle of the base (1); a rotating inspection table (4) is rotatably installed in the inner cavity of the rotating cylinder base (2); it is characterized in that feeding conveyors (6), a first defective product discharging machine (7), a second defective product discharging machine (8) and a finished product output machine (9) are respectively fixedly installed upward on the four arms of the base (1) through support rods. The inner ends of the feeding conveyors (6), the first defective product discharging machine (7), the second defective product discharging machine (8) and the finished product output machine (9) are all docked at the docking ports (204) opened at the upper end of the rotating cylinder base (2). The feeding conveyors (6) convey the packaging boxes (10) to the rotating inspection table (4) for inspection. The first defective product discharging machine (7) and the second defective product discharging machine (8) send out the unqualified packaging boxes (10) detected on the rotating inspection table (4), and the finished product output machine (9) conveys the qualified products detected on the rotating inspection table (4); above the positions where the first defective product discharging machine (7), the second defective product discharging machine (8) and the finished product output machine (9) are docked with the rotating inspection table (4), there is a visual inspection frame (5), and vertical CCD cameras (501) are respectively arranged corresponding to the docking positions on the visual inspection frame (5); a controller (3) is also arranged on the base (1); a discharging frame (12) is arranged at the bottom of the feeding conveyor (6) near the rotating cylinder base (2); four concave sinking grooves (402) are annularly distributed on the rotating inspection table (4), a discharging frame (12) is arranged in the middle of the rotating inspection table (4), and four discharging mechanisms are respectively arranged on the discharging frame (12) corresponding to the four sinking grooves (402).

2. The detection device for detecting defects of the packaging box according to claim 1, characterized in that, A driving shaft (203) is horizontally rotatably installed at the lower end of the rotating cylinder base (2). A rotating motor (201) is fixedly installed on the outer wall of the rotating cylinder base (2) at one end of the driving shaft (203). The rotating shaft of the rotating motor (201) rotates with the driving shaft (203) through a coupling. The middle part of the driving shaft (203) is a worm (2031); a limit switch (202) is arranged at the upper end of the rotating cylinder base (2) between two adjacent docking ports (204), and the limit switch (202) is electrically connected to the control circuit of the rotating motor (201).

3. The detection device for detecting defects of the packaging box according to claim 1, characterized in that, A rotating shaft (401) is vertically arranged in the middle of the lower end of the rotating inspection table (4). The lower end of the rotating shaft (401) is vertically rotatably connected to the lower base (1). A worm gear (4011) is fixedly arranged on the rotating shaft (401). The worm gear (4011) meshes with the worm (2031). The ring edge of the rotating inspection table (4) is upward and is rotationally tangent to the rotating cylinder base (2). An orifice groove corresponding to the docking port (204) is also opened on the ring wall. Four alignment contact pieces (403) are annularly distributed on the ring wall. During the rotation of the rotating inspection table (4), when the alignment contact pieces (403) are aligned with the limit switch (202), the rotating motor (201) stops working, and each working station works. After at least one second, the rotating motor (201) works again.

4. The detection device for detecting defects of the packaging box according to claim 1, characterized in that, One end of the sinking groove (402) close to the outer ring edge is an open end, and two unloading movable holes (4021) penetrating up and down are symmetrically arranged left and right in the sinking groove (402).

5. The inspection device for detecting defects of a packaging box according to claim 4, characterized in that, Anode electromagnets (13) are respectively fixedly arranged at one ends of the bottoms of the first defective product conveyor (7), the second defective product conveyor (8) and the finished product output machine (9) close to the rotary inspection table (4). After the anode electromagnets (13) are energized, anode magnetism is generated.

6. The inspection device for detecting defects of a packaging box according to claim 5, characterized in that, The CCD camera (501) above the first defective product conveyor (7) is used to detect the integrity of the packaging box (10) in the sinking groove (402) below. The CCD camera (501) above the second defective product conveyor (8) is used to detect the correctness of the information on the packaging box (10) in the sinking groove (402) below. The CCD camera (501) above the finished product output machine (9) is used to detect whether there is a packaging box (10) in the sinking groove (402) below and count.

7. The inspection device for detecting defects of the packaging box according to claim 6, characterized in that, The feeding conveyor (6) is used to convey the packaging box (10) into the corresponding sinking groove (402) on the rotary inspection table (4). Return stroke holes (601) are respectively penetrated through the left and right side plates at one end of the feeding conveyor (6) close to the rotary inspection table (4) along the conveying direction.

8. The detection device for detecting defects of a packaging box according to claim 7, characterized in that, A return rod (1101) is vertically slidably arranged in the return frame (11) along the conveying direction of the packaging box (10). A return connecting block (1102) is fixedly arranged at one end of the return rod (1101) close to the rotary inspection table (4). The return rod (1101) is sleeved with a spring (1103). The spring (1103) provides a thrust to the return connecting block (1102) always towards the rotary inspection table (4). The left and right ends of the return connecting block (1102) are respectively rotatably connected with a connecting rod (1104) through a pin shaft. The end of the connecting rod (1104) is upwardly connected with a clamping arm (1105) through a pin shaft. The inverted L-shaped structure of the clamping arm (1105) is buckled on the return stroke hole (601). A cuboid strip-shaped directional connecting rod (1106) is penetrated between the lower ends of the left and right clamping arms (1105). A directional guide rod (1107) is vertically arranged towards the return connecting block (1102) at the middle of the directional connecting rod (1106). The directional guide rod (1107) vertically slides through the return connecting block (1102). A cathode electromagnet (1108) is fixedly arranged at one end of the return connecting block (1102) facing the rotary inspection table (4). When the return connecting block (1102) moves towards the side away from the rotary inspection table (4), the two clamping arms (1105) are pulled inwards through the connecting rod (1104) to clamp the packaging box (10) at the return stroke hole (601) and carry it to move in the reverse direction of the conveying direction, and withdraw from the rotation area of the rotary inspection table (4).

9. The detection device for detecting defects of a packaging box according to claim 8, wherein, The unloading rack (12) is a cubic frame structure. The unloading mechanism consists of a tension spring (1201), an unloading plate (1202), and a cathode permanent magnet plate (1203). One end of the tension spring (1201) is fixedly connected to the middle of the side wall at one end of the unloading rack (12). The other end of the tension spring (1201) is fixedly connected to an unloading plate (1202). The unloading plate (1202) is vertically and slidably sleeved in two unloading moving holes (4021) of the sinking groove (402). Under the pulling of the tension spring (1201), the unloading plate (1202) is in the innermost position. After the packaging box (10) enters the sinking groove (402), the inner end of the packaging box (10) abuts against the unloading plate (1202), and the outer end of the packaging box (10) is inside the outer edge of the outer end of the sinking groove (402). A cathode permanent magnet plate (1203) is fixedly provided at the lower end of the unloading plate (1202). After the packaging box (10) on the feeding conveyor (6) enters the sinking groove (402) of the rotary inspection table (4), when the rotary inspection table (4) rotates, the cathode electromagnet (1108) is synchronously energized. The cathode electromagnet (1108) repels the cathode permanent magnet plate (1203), and the return connecting block (1102) moves outwards, forcing the packaging box (10) at the return stroke hole (601) to displace a certain distance in the reverse direction. When the rotary inspection table (4) rotates 90 degrees, the cathode electromagnet (1108) is powered off and demagnetized, and the packaging box (10) at the return stroke hole (601) enters the sinking groove (402). When the CCD camera (501) above the first defective product conveyor (7) and the second defective product conveyor (8) detects an abnormality, the anode electromagnets (13) corresponding to the bottoms of the first defective product conveyor (7) and the second defective product conveyor (8) are energized, attracting the corresponding unloading plates (1202) to pull the packaging boxes (10) in the slots to the corresponding first defective product conveyor (7) and the second defective product conveyor (8) to remove the defective products. When the CCD camera (501) above the finished product output machine (9) detects a packaging box (10) below, it counts and makes the anode electromagnet (13) at the bottom energized, attracting the corresponding unloading plate (1202) to send out the packaging box (10) in the slot.

10. A detection method for defects of a packaging box, characterized in that, Adopt a detection device for detecting defects of packaging boxes as described in any one of claims 1-9, including the following steps: Step S1, start the rotary inspection table (4) to perform intermittent rotary motion, and load the packaging boxes (10) input by the conveyor (6) into the sinking grooves (402) of the rotary inspection table (4) one by one; Step S2, when the rotary inspection table (4) rotates to the first detection station, use the CCD camera (501) above the first defective product ejector (7) to perform integrity detection on the packaging box (10). If a breakage or deformation defect is detected, trigger the corresponding anode electromagnet (13) to be energized, and drive the unloading mechanism to push the packaging box (10) into the first defective product ejector (7); Step S3, the rotary inspection table (4) continues to rotate to the second detection station, and use the CCD camera (501) above the second defective product ejector (8) to perform identification detection on the surface information of the packaging box (10). If a printing error or information missing is detected, trigger the corresponding anode electromagnet (13) to be energized, and drive the unloading mechanism to push the packaging box (10) into the second defective product ejector (8); Step S4, the rotary inspection table (4) continues to rotate to the finished product output station, use the CCD camera (501) above the finished product output machine (9) to confirm that the packaging box (10) in the sinking groove (402) exists and has not been excluded, trigger the corresponding anode electromagnet (13) to be energized and count, and drive the unloading mechanism to output the packaging box (10) to the finished product output machine (9); Step S5, during each rotation interval, control the rotation motor (201) to pause through the cooperation of the limit switch (202) and the alignment contact piece (403), and ensure that the detection actions at each station are executed for at least 1 second before resuming rotation.

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