Packaging box defect detection device

Abstract

The invention relates to the technical field of defect detection, and particularly discloses a packaging box defect detection device which is applied to defect detection of cylindrical packaging boxes and comprises a conveying frame and a detection unit arranged on the conveying frame, and the detection unit comprises a lifting table, a rotating motor fixedly mounted on the lifting table and a mounting table fixed to the lower end face of the lifting table; the output end of the rotating motor is connected with a rotating shaft, a detection piece is arranged at the lower end of the rotating shaft, and multiple sets of positioning pieces are circumferentially arranged on the mounting table. The positioning piece is matched with the inner side wall and the upper end edge of the cylindrical packaging box through multiple sets of radial supporting plates and axial pressing plates, it is ensured that the cylindrical packaging box and the rotating shaft are coaxially distributed, and it is ensured that the distance between the detection piece and the splicing position of the inner bottom of the cylindrical packaging box is kept constant when the detection piece moves in the circumferential direction through accurate positioning; therefore, the precision and the consistency of defect detection are ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of defect detection, and more specifically, to a packaging box defect detection device. Background Art

[0002] In the production of packaging boxes, it is necessary to perform defect detection on the packaging boxes to remove defective products and prevent defective products from flowing out;

[0003] See also Figure 1 There is a cylindrical packaging box 400, which includes a side tube 410 with an upper opening and a circular bottom plate 420. The bottom of the side tube 410 is spliced ​​and bonded with the bottom plate 420 to form a whole. It is now necessary to detect defects such as poor bonding and bonding size misalignment deviation at the annular splicing of the side tube 410 and the bottom plate 420 in the cylindrical packaging box 400;

[0004] Since the bottom joint of the cylindrical packaging box 400 is in the shape of a circular ring compared to the traditional rectangular packaging box, it is difficult for the existing defect detection device to ensure that the distance between the detection camera and the part to be detected along the way remains constant during the circumferential detection of the circular joint, thereby affecting the accuracy and consistency of the defect detection results. Summary of the invention

[0005] In order to overcome the above technical problems, the present invention proposes a packaging box defect detection device.

[0006] The purpose of the present invention can be achieved through the following technical solutions:

[0007] A packaging box defect detection device, applied to defect detection of cylindrical packaging boxes, comprises:

[0008] A conveyor frame, on which a conveyor belt for conveying cylindrical packaging boxes is rotatably mounted, and a mounting frame is fixed above the conveyor frame;

[0009] The detection unit includes a first mounting plate fixed on the mounting frame, a lifting platform escalably disposed below the first mounting plate, a rotating motor fixedly mounted on the lifting platform, and a mounting platform fixed to the lower end surface of the lifting platform;

[0010] The output end of the rotating motor is connected to a rotating shaft, and the axis of the rotating shaft coincides with the axis of the mounting platform; a detection member for detecting defects on the bottom of the cylindrical packaging box is arranged at the lower end of the rotating shaft, and a plurality of positioning members are circumferentially arranged on the mounting platform.

[0011] As a further solution of the present invention: the positioning member includes a connecting frame detachably connected to the mounting table, the connecting frame is provided with vertically distributed transverse slide grooves and vertical slide grooves, a transverse frame is slidably installed in the transverse slide groove, a second spring abutting against the transverse frame is provided in the transverse slide groove, a vertical frame is slidably installed in the vertical slide groove, and a connecting rod is hinged between the transverse frame and the vertical frame; the lower end of the vertical frame is provided with an axial pressure plate adapted to the upper edge of the cylindrical packaging box, and the lower end of the transverse frame is provided with a radial support plate adapted to the inner side wall of the cylindrical packaging box.

[0012] As a further solution of the present invention: a first airbag is arranged on the axial pressure plate, a second airbag is arranged on the radial support plate, a first air passage connected to the second airbag is opened in the transverse frame, and a first air pipe connected to the first airbag is connected to one end of the first air passage away from the second airbag.

[0013] As a further solution of the present invention: the mounting platform includes a fixed platform arranged on the lifting platform and a telescopic platform slidably embedded in the fixed platform, each positioning member is installed on the telescopic platform, and the telescopic platform is also sleeved with a first spring abutting against the fixed platform; the elastic coefficient of the first spring is greater than the elastic coefficient of the second spring.

[0014] As a further solution of the present invention: the detection component includes a connecting platform fixed to a rotating shaft, a rocker arm is rotatably mounted on the connecting platform, a detection camera is mounted on the rocker arm, a limit plate adapted to the rocker arm is obliquely arranged at the bottom of the connecting platform, a ball sleeve is arranged at one end of the rocker arm away from the connecting platform, and a ball is movably embedded in the ball sleeve.

[0015] As a further solution of the present invention: the lifting drive component includes a cylinder body fixed on the first mounting plate, a piston disk is slidably embedded in the cylinder body, a piston rod that movably penetrates the cylinder body is connected to the piston disk, and the protruding end of the piston rod is fixedly connected to the lifting platform.

[0016] As a further solution of the present invention: the rotating shaft includes an outer shaft body connected to the output end of the rotating motor, a sliding cavity is axially opened in the outer shaft body, an inner shaft body is axially slidably installed in the sliding cavity, a plurality of axial sliding strips are circumferentially arranged on the inner shaft body to slide with the outer shaft body, and the detection component is installed at the lower end of the inner shaft body.

[0017] As a further solution of the present invention: an air cavity is provided in the fixing platform, a sealing ring is provided at the rotational connection between the air cavity and the outer shaft body, a plurality of through holes connecting the sliding cavity and the air cavity are provided on the outer shaft body, and a second air passage is provided on one side of the air cavity.

[0018] As a further solution of the present invention: the piston disc divides the cylinder body into an upper cavity and a lower cavity, the upper cavity is connected to an external air pipe, and the lower cavity and the second air channel are connected to a second air pipe.

[0019] As a further solution of the present invention: it also includes a correction unit, which includes a second mounting plate fixed on the mounting frame, a lifting cylinder is vertically installed on the second mounting plate, the output end of the lifting cylinder is connected to the lifting frame, and correction plates are respectively arranged around the lifting frame. The upward end of the correction plate is inclined toward the inner side of the lifting frame, and a scanning camera is also arranged in the center of the lifting frame.

[0020] Beneficial effects of the present invention:

[0021] The positioning member in the present invention is adapted to the inner side wall and the upper edge of the cylindrical packaging box through multiple sets of radial support plates and axial pressure plates, ensuring that the cylindrical packaging box is coaxially distributed with the rotating shaft. This precise positioning ensures that the distance between the detection member and the joint at the bottom of the cylindrical packaging box remains constant during circumferential movement, thereby ensuring the accuracy and consistency of defect detection.

[0022] The radial support plate radially expands and positions the cylindrical packaging box, effectively preventing the radial deviation of the cylindrical packaging box during defect detection and ensuring the stability and accuracy of detection; the axial pressure plate applies vertical downward pressure to the upper edge of the cylindrical packaging box, preventing the axial jump of the cylindrical packaging box during defect detection and enhancing the stability of the detection process. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present invention will be further described below in conjunction with the accompanying drawings.

[0024] Figure 1 It is a structural schematic diagram of an existing cylindrical packaging box;

[0025] Figure 2 It is a three-dimensional schematic diagram of the present invention;

[0026] Figure 3 A three-dimensional schematic diagram of another viewing angle of the present invention;

[0027] Figure 4 It is a structural schematic diagram of the detection unit in the present invention;

[0028] Figure 5 It is a structural schematic diagram of the positioning member in the present invention;

[0029] Figure 6 is a cross-sectional view of the positioning member in the present invention;

[0030] Figure 7 It is a structural schematic diagram of the installation platform in the present invention;

[0031] Figure 8 It is a structural schematic diagram of the detection element in the present invention;

[0032] Fig. 9 is a cross-sectional view of the detection unit in the present invention;

[0033] Fig.10 is a cross-sectional view of the lifting drive member in the present invention;

[0034] Fig.11 for Fig. 9 Enlarged view of point A in the middle;

[0035] Fig.12 It is a structural schematic diagram of the correction unit in the present invention.

[0036] In the figure:

[0037] 100, conveyor frame; 110, conveyor belt; 120, mounting frame;

[0038] 200, detection unit; 210, first mounting plate; 220, lifting platform; 230, lifting drive member; 231, cylinder body; 232, piston plate; 233, piston rod; 234, upper cavity; 235, lower cavity; 236, external air pipe; 237, second air pipe; 240, rotating motor; 250, rotating shaft; 251, outer shaft body; 2511, sliding cavity; 2512, through hole; 252, inner shaft body; 2521, axial slide; 260, detection member; 261, connecting platform; 262, swing rod; 263, limit plate; 264, detection camera; 26 5. Ball sleeve; 266. Ball; 270. Mounting platform; 271. Fixing platform; 2711. Air cavity; 2712. Sealing ring; 2713. Second air passage; 272. Telescopic platform; 273. First spring; 280. Positioning member; 281. Connecting frame; 282. Horizontal slide; 283. Vertical slide; 284. Horizontal moving frame; 2841. First air passage; 2842. First air pipe; 285. Vertical moving frame; 286. Connecting rod; 287. Second spring; 288. Axial pressure plate; 2881. First air bag; 289. Radial support plate; 2891. Second air bag;

[0039] 300, deviation correction unit; 310, second mounting plate; 320, lifting cylinder; 330, lifting frame; 340, deviation correction plate; 350, scanning camera;

[0040] 400, cylindrical packaging box; 410, side tube; 420, bottom plate. DETAILED DESCRIPTION

[0041] The subject matter described herein will now be discussed with reference to example embodiments. It should be understood that the discussion of these embodiments is only to enable those skilled in the art to better understand and implement the subject matter described herein, and the functions and arrangements of the elements discussed may be changed without departing from the scope of protection of the contents of this specification. Each example may omit, replace or add various processes or components as needed. In addition, the features described relative to some examples may also be combined in other examples.

[0042] See also Figure 2 and Figure 3 The present invention discloses a packaging box defect detection device, which is applied to defect detection of a cylindrical packaging box 400, comprising a conveyor frame 100 and a detection unit 200, wherein a conveyor belt 110 for conveying the cylindrical packaging box 400 is rotatably mounted on the conveyor frame 100, and a mounting frame 120 is fixed above the conveyor frame 100;

[0043] See also Figure 4 The detection unit 200 includes a first mounting plate 210 fixed on the mounting frame 120, a lifting platform 220 escalably disposed below the first mounting plate 210, a rotating motor 240 fixedly mounted on the lifting platform 220, and a mounting platform 270 fixed to the lower end surface of the lifting platform 220, wherein the output end of the rotating motor 240 is connected to a rotating shaft 250, and the axis of the rotating shaft 250 coincides with the axis of the mounting platform 270; a detection member 260 for performing defect detection on the inner bottom of the cylindrical packaging box 400 is disposed at the lower end of the rotating shaft 250, and a plurality of positioning members 280 are disposed circumferentially on the mounting platform 270;

[0044] Specifically, the cylindrical packaging boxes 400 are placed on the conveyor belt 110 in sequence, and the cylindrical packaging boxes 400 are conveyed toward the side of the detection unit 200 by the conveyor belt 110. When one group of cylindrical packaging boxes 400 arrives directly below the detection unit 200, the conveyor belt 110 is suspended, the lifting platform 220 descends, and the cylindrical packaging boxes 400 are positioned by multiple groups of positioning parts 280 distributed on the mounting platform 270, so that the cylindrical packaging box 400 is coaxially distributed with the rotating shaft 250, and the rotating shaft 250 extends into the cylindrical packaging box 400 until the detection part 260 reaches the bottom of the cylindrical packaging box 400, and the detection part 260 is driven to rotate circumferentially by the rotating motor 240, so that the detection part 260 can be used to perform defect detection on the splicing at the bottom of the cylindrical packaging box 400.

[0045] It should be noted that the above-mentioned cylindrical packaging box 400 includes a side tube 410 with an opening at the upper end and a circular bottom plate 420. The bottom of the side tube 410 is spliced ​​and bonded to the bottom plate 420 as a whole. The detection device in the present invention is used to detect defects such as poor bonding and bonding size misalignment deviation at the annular joint between the side tube 410 and the bottom plate 420.

[0046] In one embodiment, see Figure 5 The positioning member 280 includes a connecting frame 281 detachably connected to the mounting table 270, and the connecting frame 281 is provided with a vertically distributed horizontal slide groove 282 and a vertical slide groove 283. A lateral moving frame 284 is slidably installed in the horizontal slide groove 282, and a second spring 287 abutting against the lateral moving frame 284 is provided in the horizontal slide groove 282. A vertical moving frame 285 is slidably installed in the vertical slide groove 283, and a connecting rod 286 is hinged between the lateral moving frame 284 and the vertical moving frame 285; the lower end of the vertical moving frame 285 is provided with an axial pressing plate 288 adapted to the upper edge of the cylindrical packaging box 400, and the lower end of the lateral moving frame 284 is provided with a radial support plate 289 adapted to the inner wall of the cylindrical packaging box 400;

[0047] Specifically, in the initial state, due to the elastic force of the second spring 287, the transverse moving frame 284 is always located at one end of the transverse slide groove 282 close to the axis of the mounting platform 270, and under the action of the connecting rod 286, the vertical moving frame 285 is also always located at the lower end of the vertical slide groove 283;

[0048] When the lifting platform 220 moves downward, the connecting frame 281 is driven to move downward synchronously as a whole, so that the transverse frame 284 is inserted into the cylindrical packaging box 400, and then the axial pressure plate 288 at the lower end of the vertical frame 285 contacts the upper edge of the cylindrical packaging box 400. As the connecting frame 281 continues to move downward, the vertical frame 285 slides upward relative to the vertical slide groove 283, and under the transmission of the connecting rod 286, the corresponding transverse frame 284 is driven to slide horizontally along the transverse slide groove 282, so that the corresponding transverse frame 28 The radial support plates 289 on 4 expand radially outward until the radial support plates 289 contact the inner wall of the cylindrical packaging box 400, and the inner wall of the cylindrical packaging box 400 is expanded and supported at the same time by multiple groups of radial support plates 289 arranged circumferentially, thereby ensuring that the axis of the cylindrical packaging box 400 coincides with the axis of the rotating shaft 250, so as to ensure that the distance between the detection member 260 and the joint at the inner bottom of the cylindrical packaging box 400 is always kept constant during the circumferential movement, thereby ensuring the accuracy and consistency of defect detection.

[0049] It is worth noting that the positioning member 280 is adapted to the inner side wall and the upper edge of the cylindrical packaging box 400 through multiple sets of radial support plates 289 and axial pressure plates 288, ensuring that the cylindrical packaging box 400 and the rotating shaft 250 are coaxially distributed. This precise positioning ensures that the distance between the detection member 260 and the joint of the inner bottom of the cylindrical packaging box 400 remains constant during the circumferential movement, thereby ensuring the accuracy and consistency of defect detection;

[0050] The radial support plate 289 radially expands and positions the cylindrical packaging box 400, effectively preventing the radial deviation of the cylindrical packaging box 400 during defect detection, thereby ensuring the stability and accuracy of detection; the axial pressure plate 288 applies vertical downward pressure to the upper edge of the cylindrical packaging box 400, thereby preventing the axial jump of the cylindrical packaging box 400 during defect detection, thereby enhancing the stability of the detection process; the design of the positioning member 280 enables the detection device to adapt to cylindrical packaging boxes 400 of different sizes, with good versatility and adaptability, and through the rapid positioning of the positioning member 280, the mechanical damage to the cylindrical packaging box 400 is reduced, thereby protecting the appearance and structural integrity of the product.

[0051] For further information, see Figure 6 The axial pressure plate 288 is provided with a first airbag 2881, the radial support plate 289 is provided with a second airbag 2891, the transverse frame 284 is provided with a first air passage 2841 communicating with the second airbag 2891, and one end of the first air passage 2841 away from the second airbag 2891 is connected to a first air pipe 2842 communicating with the first airbag 2881;

[0052] Specifically, when the first airbag 2881 on the axial pressure plate 288 contacts the upper edge of the cylindrical packaging box 400, the first airbag 2881 is squeezed and deflated, so that the gas in the first airbag 2881 enters the second airbag 2891 through the first air tube 2842 and the first air channel 2841, and then causes the second airbag 2891 to expand and completely fit with the inner wall of the cylindrical packaging box 400 to ensure the centering of the cylindrical packaging box 400; in addition, the first airbag 2881 and the second airbag 2891 can wrap the cylindrical packaging box 400, effectively preventing the axial pressure plate 288 and the radial support plate 289 from causing defects such as extrusion scratches on the cylindrical packaging box 400.

[0053] It should be noted that when the first airbag 2881 on the axial pressure plate 288 contacts the upper edge of the cylindrical packaging box 400, the second airbag 2891 expands and completely fits the inner wall of the cylindrical packaging box 400. This linkage mechanism ensures that the axis of the cylindrical packaging box 400 coincides with the axis of the rotating shaft 250, thereby improving the centering accuracy. The linkage effect of the first airbag 2881 and the second airbag 2891 can wrap the cylindrical packaging box 400, effectively avoiding defects such as extrusion scratches on the cylindrical packaging box 400 caused by the axial pressure plate 288 and the radial support plate 289, thereby protecting the appearance and structural integrity of the packaging box. The expansion and contraction characteristics of the airbag This enables the detection device to adapt to cylindrical packaging boxes 400 of different sizes, because the airbag can automatically adjust its shape and size according to the size of the packaging box, thereby achieving better adaptation and positioning. In addition, the airbag, as a flexible protective element, can provide a buffer for the cylindrical packaging box 400 and reduce damage to the packaging box, especially unexpected impacts that may occur during the detection process; the linkage effect of the airbag enhances the stability and reliability of the entire detection process, because the airbag can provide a uniform and stable force to ensure that the distance between the detection piece 260 and the bottom joint of the cylindrical packaging box 400 remains constant, which is crucial to ensuring the accuracy and consistency of defect detection.

[0054] Furthermore, considering that the detection member 260 at the lower end of the rotating shaft 250 needs to reach the inner bottom of the cylindrical packaging box 400 to perform defect detection, in order to avoid the axial interference of the positioning member 280 on the detection member 260, please refer to Figure 7 The mounting platform 270 includes a fixed platform 271 disposed on the lifting platform 220 and a telescopic platform 272 slidably embedded in the fixed platform 271. Each positioning member 280 is mounted on the telescopic platform 272. The telescopic platform 272 is also sleeved with a first spring 273 that abuts against the fixed platform 271. The elastic coefficient of the first spring 273 is greater than the elastic coefficient of the second spring 287.

[0055] Specifically, after the positioning member 280 contacts the cylindrical packaging box 400, the vertical moving frame 285 and the horizontal moving frame 284 respectively perform axial compression and radial expansion positioning on the cylindrical packaging box 400. During this process, since the elastic coefficient of the first spring 273 is greater than the elastic coefficient of the second spring 287, the first spring 273 will not be compressed, and the telescopic table 272 will not slide axially with the fixed table 271; when the radial support plate 289 is completely in contact with the inner wall of the cylindrical packaging box 400, the radial support plate 289 and the axial pressure plate 288 cannot continue to move, and the rotating shaft 250 and the detection member 260 still need to continue to descend. During this process, as the rotating shaft 250 and the detection member 260 continue to descend, the first spring 273 begins to be compressed, and the telescopic table 272 gradually retracts into the fixed table 271 until the detection member 260 reaches the detection position at the bottom of the cylindrical packaging box 400.

[0056] It is worth noting that by setting up the telescopic platform 272 and the first spring 273, the axial interference of the positioning member 280 on the detection member 260 can be effectively avoided. When the detection member 260 needs to further descend to the inner bottom of the cylindrical packaging box 400, the sliding mechanism of the telescopic platform 272 allows the detection member 260 to continue to move downward without being hindered by the positioning member 280, and can adapt to cylindrical packaging boxes 400 of different heights; setting the elastic coefficient of the first spring 273 to be greater than the elastic coefficient of the second spring 287 ensures that the telescopic platform 272 remains stable during the positioning process, thereby avoiding shaking of the entire detection unit 200.

[0057] In yet another embodiment, see Figure 8 The detection member 260 includes a connecting platform 261 fixed to the rotating shaft 250, a swing rod 262 is rotatably mounted on the connecting platform 261, a detection camera 264 is mounted on the swing rod 262, a limit plate 263 adapted to the swing rod 262 is obliquely arranged at the bottom of the connecting platform 261, a ball sleeve 265 is arranged at one end of the swing rod 262 away from the connecting platform 261, and a ball 266 is movably embedded in the ball sleeve 265;

[0058] Specifically, in the initial state, the rocker arm 262 flips downward under the action of its own gravity to an inclined state in contact with the limit plate 263. When the shaft 250 moves downward until the ball 266 contacts the bottom plate 420, as the shaft 250 continues to move downward, the distance between the connecting platform 261 and the bottom plate 420 gradually decreases, so that the rocker arm 262 flips upward relative to the connecting platform 261 and disengages from the limit plate 263. At the same time, the ball 266 always rolls on the bottom plate 420 toward the side tube 410 until the ball 266 rolls to the joint of the side tube 410 and the bottom plate 420. Then, the rocker arm 262 is driven to move in a circle by the shaft 250, and the detection camera 264 can be used to capture images of the joints to analyze defects at different joints.

[0059] It should be noted that since the end of the rocker arm 262 away from the connecting platform 261 is always located at the joint of the side tube 410 and the bottom plate 420, it can be ensured that during the entire circular detection process, the distance between the detection camera 264 and the corresponding position to be detected remains constant, thereby ensuring the consistency of the detection data; during the circular motion of the rocker arm 262, the ball 266 adaptively rolls along the annular joint, which can effectively reduce the resistance to the movement of the rocker arm 262 and avoid scratches on the cylindrical packaging box 400.

[0060] For further information, see Fig. 9 and Fig.10The lifting drive member 230 includes a cylinder body 231 fixed on the first mounting plate 210, a piston disc 232 is slidably embedded in the cylinder body 231, a piston rod 233 movably penetrating the cylinder body 231 is connected to the piston disc 232, and the protruding end of the piston rod 233 is fixedly connected to the lifting platform 220; the lifting platform 220 can be driven to adjust its height through the telescopic movement of the piston rod 233.

[0061] Accordingly, in order to prevent the detection unit 200 from interfering with the cylindrical packaging box 400 passing below it, it is necessary to ensure that the initial heights of the positioning member 280 and the detection member 260 are higher than the cylindrical packaging box 400, and during the detection process, the downward movement of the detection member 260 is greater than the downward movement of the lifting platform 220 and the positioning member 280; for this purpose, the rotating shaft 250 includes an outer shaft body 251 connected to the output end of the rotating motor 240, a sliding cavity 2511 is axially opened in the outer shaft body 251, an inner shaft body 252 is axially slidably installed in the sliding cavity 2511, and a plurality of axial sliding strips 2521 slidably adapted to the outer shaft body 251 are circumferentially arranged on the inner shaft body 252, and the detection member 260 is installed at the lower end of the inner shaft body 252;

[0062] In the initial state, the inner shaft body 252 is retracted into the outer shaft body 251. At this time, the height of the detection piece 260 is higher than the cylindrical packaging box 400, so as not to affect the smooth passage of the cylindrical packaging box 400 below it by the conveyor belt 110; and in the defect detection process, when the lifting platform 220 descends, the inner shaft body 252 extends axially downward from the outer shaft body 251, so that the detection piece 260 can smoothly reach the bottom of the cylindrical packaging box 400.

[0063] In order to realize the telescopic movement of the inner shaft body 252 and improve the synchronization between the telescopic movement of the inner shaft body 252 and the lifting movement of the lifting platform 220, please refer to Fig. 9 and Fig.11 The fixed platform 271 has an air cavity 2711 in it, a sealing ring 2712 is provided at the rotation connection between the air cavity 2711 and the outer shaft body 251, the outer shaft body 251 has a plurality of through holes 2512 connecting the sliding cavity 2511 and the air cavity 2711, and a second air passage 2713 is provided on one side of the air cavity 2711;

[0064] See also Fig. 9 and Fig.10 The piston plate 232 divides the cylinder body 231 into an upper cavity 234 and a lower cavity 235. The upper cavity 234 is connected to an external air pipe 236, and the lower cavity 235 is connected to the second air channel 2713 via a second air pipe 237.

[0065] Specifically, air is blown into the upper cavity 234 through the external air pipe 236, so that the air pressure inside the upper cavity 234 increases, driving the piston plate 232 downward, thereby driving the lifting platform 220 downward by the piston rod 233, and at the same time, the piston plate 232 squeezes the gas in the lower cavity 235 into the air cavity 2711 through the second air pipe 237 and the second air channel 2713, and then the gas enters the sliding cavity 2511 through the through hole 2512, thereby synchronously pushing the inner shaft body 252 out of the outer shaft body 251;

[0066] The gas in the upper cavity 234 is extracted through the external air pipe 236, thereby reducing the internal air pressure of the upper cavity 234, driving the piston plate 232 upward, and the piston rod 233 can be used to drive the lifting platform 220 to rise. At the same time, the volume of the lower cavity 235 increases, and the gas in the sliding cavity 2511 can be sucked into the lower cavity 235 through the air cavity 2711 and the second air pipe 237, so that the internal air pressure of the sliding cavity 2511 is reduced, so as to drive the inner shaft body 252 to retract into the outer shaft body 251.

[0067] It is worth noting that, through the linkage of the lifting drive 230 and the inner shaft 252, the downward movement depth of the detection member 260 can be accurately controlled to ensure that the detection member 260 can smoothly reach the detection position at the bottom of the cylindrical packaging box 400, while avoiding any interference or damage to the cylindrical packaging box 400; the telescopic movement of the inner shaft 252 is synchronized with the lifting movement of the lifting platform 220, which can ensure that the detection member 260 always maintains the correct position and posture during the descent or ascent of the lifting platform 220, thereby improving the accuracy and reliability of the detection; in the initial state, the inner shaft 252 retracts into the outer shaft 251, so that the height of the detection member 260 is higher than the cylindrical packaging box 400, avoiding interference with the cylindrical packaging box 400 on the conveyor belt 110, and ensuring the smooth transportation of the packaging box.

[0068] In a further embodiment, considering that the placement position of the cylindrical packaging box 400 dropped from the inlet end of the conveyor frame 100 to the conveyor belt 110 is random, if the deviation is large, the positioning member 280 in the subsequent detection unit 200 will not be able to smoothly position the cylindrical packaging box 400. For this purpose, please refer to Fig.12 , further comprising a correction unit 300, the correction unit 300 comprising a second mounting plate 310 fixed on the mounting frame 120, a lifting cylinder 320 being vertically mounted on the second mounting plate 310, an output end of the lifting cylinder 320 being connected to a lifting frame 330, correction plates 340 being respectively arranged around the lifting frame 330, an upward end of the correction plate 340 being arranged obliquely toward the inner side of the lifting frame 330, and a scanning camera 350 being further arranged at the center of the lifting frame 330;

[0069] Specifically, when the randomly placed cylindrical packaging box 400 arrives under the correction unit 300, the scanning camera 350 scans the cylindrical packaging box 400, the conveyor belt 110 stops running, and the lifting cylinder 320 drives the lifting frame 330 downward, so that the cylindrical packaging box 400 is adjusted in position by using the correction plates 340 symmetrically distributed on all sides until the upper edge of the cylindrical packaging box 400 contacts the four groups of correction plates 340 at the same time. In this way, it can be ensured that the center of the cylindrical packaging box 400 coincides with the center of the lifting frame 330. At this time, the cylindrical packaging box 400 is also corrected to the center of the conveyor belt 110. Then the conveyor belt 110 continues to run the set distance, and the cylindrical packaging box 400 can be accurately transported to the bottom of the detection unit 200, where the set distance is the distance between the correction unit 300 and the detection unit 200.

[0070] It is worth noting that through the rapid position adjustment of the correction unit 300, the detection delay caused by inaccurate position is reduced, thereby improving the overall detection efficiency; the correction plate 340 is tilted toward the inside of the lifting frame 330. This design helps to gently push the packaging box to the correct position and avoid mechanical damage to the packaging box; the correction unit 300 ensures that each cylindrical packaging box 400 can enter the detection unit 200 in the same position and posture, which helps to maintain the consistency of the detection results.

[0071] The specific implementation methods of this embodiment are described above, but this embodiment is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Ordinary technicians in this field can also make many forms inspired by this embodiment, all of which are within the protection of this embodiment.

Claims

1. A packaging box defect detection device, used for defect detection of cylindrical packaging boxes (400), characterized in that: include: A conveying frame (100) on which a conveying belt (110) for conveying a cylindrical packaging box (400) is rotatably mounted, and a mounting frame (120) is fixed above the conveying frame (100); A detection unit (200) comprising a first mounting plate (210) fixed on a mounting frame (120), a lifting platform (220) liftably disposed below the first mounting plate (210), a rotating motor (240) fixedly mounted on the lifting platform (220), and a mounting platform (270) fixed to a lower end surface of the lifting platform (220); The output end of the rotating motor (240) is connected to a rotating shaft (250), the axis of the rotating shaft (250) coincides with the axis of the mounting platform (270); a detection member (260) for detecting defects on the inner bottom of the cylindrical packaging box (400) is provided at the lower end of the rotating shaft (250), and a plurality of groups of positioning members (280) are circumferentially provided on the mounting platform (270).

2. A packaging box defect detection device according to claim 1, characterized in that: The positioning member (280) comprises a connecting frame (281) detachably connected to the mounting platform (270), the connecting frame (281) being provided with vertically distributed transverse slide grooves (282) and vertical slide grooves (283), a transverse frame (284) being slidably installed in the transverse slide groove (282), a second spring (287) being provided in the transverse slide groove (282) and being in contact with the transverse frame (284), a vertical frame (285) being slidably installed in the vertical slide groove (283), a connecting rod (286) being hinged between the transverse frame (284) and the vertical frame (285); an axial pressure plate (288) being adapted to the upper edge of the cylindrical packaging box (400) is provided at the lower end of the vertical frame (285), and a radial support plate (289) being adapted to the inner wall of the cylindrical packaging box (400) is provided at the lower end of the transverse frame (284).

3. A packaging box defect detection device according to claim 2, characterized in that: The axial pressure plate (288) is provided with a first airbag (2881), the radial support plate (289) is provided with a second airbag (2891), a first air channel (2841) in communication with the second airbag (2891) is provided in the transverse frame (284), and an end of the first air channel (2841) away from the second airbag (2891) is connected to a first air pipe (2842) in communication with the first airbag (2881).

4. A packaging box defect detection device according to claim 2, characterized in that: The mounting platform (270) comprises a fixed platform (271) arranged on the lifting platform (220) and a telescopic platform (272) slidably embedded in the fixed platform (271); each positioning member (280) is mounted on the telescopic platform (272); and the telescopic platform (272) is also sleeved with a first spring (273) abutting against the fixed platform (271); the elastic coefficient of the first spring (273) is greater than the elastic coefficient of the second spring (287).

5. A packaging box defect detection device according to claim 1, characterized in that: The detection member (260) comprises a connecting platform (261) fixed to the rotating shaft (250), a swing rod (262) being rotatably mounted on the connecting platform (261), a detection camera (264) being mounted on the swing rod (262), a limit plate (263) adapted to the swing rod (262) being obliquely arranged at the bottom of the connecting platform (261), a ball sleeve (265) being arranged at one end of the swing rod (262) away from the connecting platform (261), and a ball (266) being movably embedded in the ball sleeve (265).

6. A packaging box defect detection device according to claim 4, characterized in that: The device also comprises a lifting drive member (230), wherein the lifting drive member (230) comprises a cylinder body (231) fixed on the first mounting plate (210), a piston disc (232) being slidably embedded in the cylinder body (231), a piston rod (233) being connected to the piston disc (232) and movably penetrating the cylinder body (231), and a protruding end of the piston rod (233) being fixedly connected to the lifting platform (220).

7. A packaging box defect detection device according to claim 6, characterized in that: The rotating shaft (250) comprises an outer shaft body (251) connected to the output end of the rotating motor (240); a sliding cavity (2511) is axially provided in the outer shaft body (251); an inner shaft body (252) is axially slidably installed in the sliding cavity (2511); a plurality of axial sliding strips (2521) slidably matched with the outer shaft body (251) are circumferentially provided on the inner shaft body (252); and the detection member (260) is installed at the lower end of the inner shaft body (252).

8. A packaging box defect detection device according to claim 7, characterized in that: An air cavity (2711) is provided in the fixed platform (271), a sealing ring (2712) is provided at the rotational connection between the air cavity (2711) and the outer shaft body (251), a plurality of through holes (2512) connecting the sliding cavity (2511) and the air cavity (2711) are provided on the outer shaft body (251), and a second air passage (2713) is provided on one side of the air cavity (2711).

9. A packaging box defect detection device according to claim 8, characterized in that: The piston disc (232) divides the cylinder body (231) into an upper cavity (234) and a lower cavity (235); the upper cavity (234) is connected to an external air pipe (236); and the lower cavity (235) and the second air channel (2713) are connected to a second air pipe (237).

10. A packaging box defect detection device according to claim 1, characterized in that: The device further comprises a deflection correction unit (300), wherein the deflection correction unit (300) comprises a second mounting plate (310) fixed on the mounting frame (120), a lifting cylinder (320) being vertically mounted on the second mounting plate (310), an output end of the lifting cylinder (320) being connected to a lifting frame (330), deflection correction plates (340) being respectively arranged around the lifting frame (330), an upward end of the deflection correction plate (340) being arranged tilted toward the inner side of the lifting frame (330), and a scanning camera (350) being also arranged in the center of the lifting frame (330).

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