An accurate defect detection device for laser-scanned cigarette box cardboard blanks

Abstract

The present invention relates to the technical field of cigarette box paperboard appearance detection, and in particular to a laser scanning type cigarette box paperboard blank precision defect detection device, including a central control base, a controller unit on the side of the central control base, the controller unit of the central control base is connected to the wires of various power components, a carrier plate is fixed to the upper central area of the central control base, and a conveying roller group is symmetrically installed at the input end and the output end of the central control base. Through the coordinated configuration of the laser detector array and the thickness detection mechanism, the surface microscopic defects and thickness anomalies are synchronously detected, the problem of low efficiency of traditional step-by-step detection is solved, and the speed measurement is improved; the mobile frame and the spring 1 constitute an elastic positioning system, which cooperates with the differential operation of the conveying roller group to achieve adaptive clamping of the blank surface, maintain a constant clamping force, and avoid crease defects caused by rigid clamping; the telescopic rod of the electric push rod 1 drives the marking pen 1 to move vertically, and combined with the real-time data of the dynamic feedback sensor of the thickness detection mechanism, the positioning accuracy can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of appearance detection of cigarette box cardboard, and particularly to a precise defect detection device for cigarette box cardboard blanks by laser scanning. Background Art

[0002] Cigarette box cardboard is the main structural material for cigarette packaging. It is made by mixing wood pulp with other chemical fibers, and some may add components such as bleached hemp pulp. It is often used in combination with a metal foil layer (such as aluminum foil) to form a multi-layer composite material, which has both barrier and protection functions.

[0003] The appearance defect detection of cigarette box cardboard blanks is a crucial link in the production process. Because surface defects (such as missing printing, stains, scratches, etc.) will directly affect the aesthetics of the packaging, and may even lead to problems such as color difference and misprinting in the printed products, damaging the trust of consumers in the brand.

[0004] Currently, the detection of cigarette box cardboard blanks generally adopts a step-by-step detection process, which requires independent devices to separately complete surface defect identification and thickness anomaly detection, resulting in low detection efficiency. In addition, the repeated clamping during the step-by-step detection is likely to cause crease defects on the cardboard. Moreover, the traditional rigid clamping device for cooperating with the detection of cigarette box cardboard blanks often cannot adapt to small and medium-sized width changes, resulting in the need for frequent manual adjustment of positioning parameters, and a large fluctuation range of the clamping force, which is likely to cause material deformation or indentation.

[0005] Therefore, a precise defect detection device for cigarette box cardboard blanks by laser scanning is specifically designed to solve the above technical problems. Summary of the Invention

[0006] In order to overcome the shortcomings of the above-mentioned existing technologies, the present invention provides a precise defect detection device for cigarette box cardboard blanks by laser scanning.

[0007] The technical implementation solution of the present invention is: a precise defect detection device for cigarette box cardboard blanks by laser scanning, including a central control machine base. A controller unit is provided on the side of the central control machine base, and the controller unit of the central control machine base is electrically connected to each power component. A bearing plate is fixed in the central area of the upper part of the central control machine base. Conveyor roller groups are symmetrically installed at the input end and the output end of the central control machine base. A mounting frame is fixedly spanned on the upper part of the bearing plate. An array of laser detectors is symmetrically arranged on the upper part of the mounting frame. There are four restraint seats, and the four restraint seats are respectively installed at the four corners of the bearing plate. There are two moving frames, and the two moving frames are respectively slidably connected between two restraint seats on the same side. A pair of springs is symmetrically connected at the sliding connection between the restraint seat and the moving frame. Positioning roller groups are symmetrically installed on both sides of the two moving frames. A bracket is arranged between the fronts of the two moving frames. An electric push rod I is vertically installed in the middle of the bracket. A marking pen I is connected to the telescopic end of the electric push rod I. Thickness detection mechanisms for assisting in positioning the roller groups are provided on both sides of the fronts of the two moving frames.

[0008] Optionally, the thickness detection mechanism includes an actuator, a pushing roller, an auxiliary support rod, a contact roller, a second spring, and a dynamic feedback sensor. The actuator is embedded and installed on both sides of the lower part of the bracket. The actuator is electrically connected to the first electric push rod. The pushing roller is arranged at the lower front part inside the moving frame. The auxiliary support rods are symmetrically installed at the upper front part inside the moving frame. The contact roller is slidably connected between the two auxiliary support rods. The contact roller and the pushing roller are in a parallel up-and-down state. The middle part of the contact roller is a rotating part. The second spring is symmetrically connected to the sliding connection part of the auxiliary support rod and the contact roller. The dynamic feedback sensor is installed on the upper part of the auxiliary support rod. The dynamic feedback sensor is close to the sliding connection part of the auxiliary support rod and the contact roller. The dynamic feedback sensor is signal-connected to the actuator.

[0009] Optionally, it further includes a horizontal irradiator, which is symmetrically installed on both sides of the front part of the moving frame and is located below the bracket.

[0010] Optionally, the emission ends of the horizontal irradiators on both sides are arranged facing each other, and their infrared rays are at the same horizontal height and overlap, so as to confirm that the cardboard blank is in a horizontal state.

[0011] Optionally, it further includes an integrated flow deflector, an air inlet pipe, and air nozzles. The integrated flow deflector is arranged at the middle part above the bearing plate. The air inlet pipe is connected to the side part of the integrated flow deflector. The air inlet end of the air inlet pipe extends towards the outside of the central control base to introduce an external air source. A plurality of air nozzles are connected to the upper part of the integrated flow deflector.

[0012] Optionally, the integrated flow deflector is located directly below the laser detector array. The air nozzles are evenly dispersed on the upper part of the integrated flow deflector, and the air outlet of the air nozzle is a convex parabolic surface.

[0013] Optionally, it further includes a carrier rod, a limiting roller, a contact block, and a third spring. The carrier rods are symmetrically arranged on both sides of the upper part of the bearing plate near the middle. The limiting roller is rotatably connected between the two carrier rods. There are a plurality of contact blocks. The plurality of contact blocks are slidably inserted into the limiting roller along the radial direction. The number of the third springs is the same as that of the contact blocks. The third spring is connected to the sliding connection part of the contact block and the limiting roller. In the initial state, the contact block connected to the third spring slides out of the limiting roller.

[0014] Optionally, it further includes a driving slide rail frame, a slide seat, a second electric push rod, and a second marking pen. The driving slide rail frame is installed at the rear part of the upper part of the bearing plate. The upper part of the driving slide rail frame is a slide rail module. The slide seat is slidably installed in the slide rail module. The side part of the slide seat protrudes from the inside of the slide rail module. The second electric push rod is installed on the protruding part of the slide seat. The second marking pen is connected to the telescopic end of the second electric push rod.

[0015] Compared with the prior art, the present invention has the following advantages: 1. Through the coordinated configuration of the laser detector array and the thickness detection mechanism, the surface microdefects and thickness anomalies are detected synchronously, solving the problem of low efficiency of traditional step-by-step detection and improving the detection speed; the moving frame and the first spring form an elastic positioning system, which cooperates with the differential operation of the conveying roller group to realize the self-adaptive clamping of the blank surface, maintain a constant clamping force, and avoid crease defects caused by rigid clamping; the telescopic rod of the first electric push rod drives the first marking pen to move vertically, combined with the real-time data of the dynamic feedback sensor of the thickness detection mechanism, which can improve the positioning accuracy.

[0016] 2. Through the complementary mechanism formed by the physical contact measurement of the contact roller and the infrared ray occlusion detection of the horizontal irradiator, when there is a thickness deviation, the first electric push rod drives the first marking pen to automatically perform double marking to reduce the misdetection rate.

[0017] 3. The suspension air cushion generated by the parabolic air nozzle can cause small-amplitude micro-vibrations of the blank. Combined with the vibration mode analysis of the laser detector array, the recognition rate of internal cracks of the blank can be improved compared with the efficiency of traditional optical detection.

[0018] 4. The spring three elastic telescopic structure of the contact block senses the concave and convex defects on the surface of the blank. When more than a certain number of contact blocks slide out beyond the limiting roller at the same time, the central control base will automatically adjust the conveying speed and start air flow pressurization to prevent the expansion of defects.

[0019] 5. Through the linkage of the lateral movement of the sliding seat along the slide rail module and the telescopic action of the second electric push rod, the marking modes of points, lines, and surfaces can be automatically selected according to the defect area, realizing the data binding of the defect type and the marking graph, which is convenient for rapid sorting in subsequent processes. Brief Description of the Drawings

[0020] Figure 1 It is a schematic assembly structure diagram of the present invention.

[0021] Figure 2 It is a three-dimensional structure diagram of components such as the conveying roller group, mounting frame, and restraint seat of the present invention.

[0022] Figure 3 It is a three-dimensional structure diagram of components such as the bearing plate, bracket, and restraint seat of the present invention.

[0023] Figure 4 It is a sectional view schematic diagram of components such as the horizontal irradiator, integrated air deflector, and drive slide rail frame of the present invention.

[0024] Figure 5 It is a three-dimensional structure diagram of components such as the restraint seat, bracket, and part A of the present invention.

[0025] Figure 6 It is an enlarged schematic diagram of part A of the present invention.

[0026] Figure 7 This is a schematic cross-sectional structure diagram of components such as the restraint seat, moving frame, and horizontal irradiator of the present invention.

[0027] Figure 8 This is a schematic cross-sectional structure diagram of components such as the horizontal irradiator, integrated air deflector, and limit roller of the present invention.

[0028] Figure 9 This is a schematic cross-sectional structure diagram of the limit roller, contact block, and spring three in the initial state of the present invention.

[0029] Figure 10 This is a schematic plan view of components such as the bearing plate, positioning roller set, and pushing roller of the present invention.

[0030] Figure 11 This is a schematic plan sectional view of components such as the bearing plate, mounting frame, and laser detector array of the present invention.

[0031] The markings of each component in the drawings are as follows: 1: Central control base, 11: Bearing plate, 2: Conveyor roller set, 3: Mounting frame, 31: Laser detector array, 4: Restraint seat, 41: Moving frame, 42: Spring one, 43: Positioning roller set, 5: Bracket, 51: Electric push rod one, 52: Marker pen one, 53: Actuator, 54: Pushing roller, 541: Auxiliary support rod, 55: Contact roller, 56: Spring two, 57: Dynamic feedback sensor, 6: Horizontal irradiator, 61: Infrared ray, 7: Integrated air deflector, 71: Air inlet pipe, 72: Air nozzle, 8: Carrier rod, 81: Limit roller, 82: Contact block, 83: Spring three, 9: Driving slide rail frame, 91: Slide seat, 92: Electric push rod two, 93: Marker pen two. Detailed implementation manners

[0032] To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the drawings. It is hereby declared that the orientation terms such as up, down, left, right, front, back, inside, and outside that appear or will appear in the text of the present invention are only based on the drawings of the present invention, and they do not specifically limit the present invention.

[0033] Embodiment: A precise defect detection device for cigarette box cardboard blanks by laser scanning, such as Figures 1 - 8 , Figure 10 and Figure 11As shown in the figure, it includes a central control base 1. The side of the central control base 1 is equipped with a controller unit. The controller unit of the central control base 1 realizes signal interaction with each power component through wire connection (cable / data line), executes initialization programs, parameter calibration and abnormal alarm, and coordinates the operation of each power component. The bearing plate 11 is fixed to the upper central area of the central control base 1 by bolts. The bearing plate 11 provides structural support and an installation reference surface. The conveying roller group 2 is symmetrically installed at the input end and the output end of the central control base 1. The conveying roller group 2 drives and transports cardboard blanks. The mounting frame 3 is fixed across the upper part of the bearing plate 11. The laser detector array 31 is symmetrically arranged on the upper part of the mounting frame 3 by bolts. The laser detector array 31 synchronously executes surface micro-defect (missing printing, scratch) scanning and three-dimensional topography reconstruction, identifies hidden cracks (combined with subsequent air cushion vibration analysis). There are four restraint seats 4, and the four restraint seats 4 are respectively installed at the corners of the bearing plate 11. There are two moving frames 41, and the two moving frames 41 are respectively slidably connected between two restraint seats 4 on the same side. The first spring 42 is symmetrically connected at the sliding connection of the restraint seat 4 and the moving frame 41. Under the elastic action of the first spring 42, the moving frame 41 slides along the restraint seat 4 to adapt to blanks of medium and small widths, maintaining a constant clamping force and avoiding creases caused by rigid clamping. The positioning roller group 43 is symmetrically installed on both sides of the two moving frames 41. The positioning roller group 43 and the conveying roller group 2 cooperate to form a clamping channel, and the position of the blank is stabilized through elastic pressure. The conveying roller group 2 makes the blank tense by differential operation, and cooperates with the positioning roller group 43 to achieve stable conveying. The bracket 5 is arranged between the fronts of the two moving frames 41. The first electric push rod 51 is vertically installed in the middle of the bracket 5. The marking pen 52 is connected to the telescopic end of the first electric push rod 51. The first electric push rod 51 drives the marking pen 52 to move vertically. Thickness detection mechanisms are provided on both sides of the fronts of the two moving frames 41.

[0034] As Figures 2 - 7 and Figure 10As shown in the figure, the thickness detection mechanism includes an actuator 53, a pushing roller 54, an auxiliary support rod 541, a contact roller 55, a second spring 56, and a dynamic feedback sensor 57. The actuator 53 is embedded and installed on both sides of the lower part of the bracket 5 through bolts. The actuator 53 is electrically connected to the first electric push rod 51. The pushing roller 54 is arranged in the front part near the lower part of the moving frame 41 through bearings. The auxiliary support rods 541 are symmetrically installed in the upper part of the front part of the moving frame 41. The contact roller 55 is slidably connected between the two auxiliary support rods 541. The contact roller 55 and the pushing roller 54 are in a parallel state up and down. The middle part of the contact roller 55 is a rotating part. The pushing roller 54 and the contact roller 55 form a detection channel to drive the blank through the thickness detection area. The second spring 56 is symmetrically connected to the sliding connection of the auxiliary support rod 541 and the contact roller 55. The contact roller 55 is elastically floating through the second spring 56 to detect abnormal thickness of the blank. The dynamic feedback sensor 57 is installed on the upper part of the auxiliary support rod 541. The dynamic feedback sensor 57 monitors the displacement of the contact roller 55 in real time and outputs a thickness deviation signal. The actuator 53 receives the signal of the dynamic feedback sensor 57 and adjusts the rotation speed of the pushing roller 54. The dynamic feedback sensor 57 is close to the sliding connection of the auxiliary support rod 541 and the contact roller 55. The dynamic feedback sensor 57 is signal-connected to the actuator 53.

[0035] As Figure 4 , Figure 7 , Figure 8 and Figure 10 shown in the figure, it further includes a horizontal irradiator 6. The horizontal irradiator 6 is symmetrically installed on both sides of the front part of the moving frame 41 through bolts, and is connected to the central control base 1 through a signal line, and the horizontal irradiator 6 is located below the bracket 5; the emission ends of the two horizontal irradiators 6 are arranged facing each other, and their infrared rays 61 are at the same horizontal height and overlap, so as to confirm that the cardboard blank is in a horizontal state. The two infrared rays 61 form an overlapping light spot at the midline of the bearing plate 11 to verify the flatness of the blank, and trigger secondary marking when the thickness is insufficient.

[0036] As Figure 1 , Figure 3 , Figure 4 , Figure 8 , Figure 10 and Figure 11As shown in the figure, it also includes an integrated fairing 7, an air inlet pipe 71 and an air flow nozzle 72. The integrated fairing 7 is bolted and fixed at the middle upper part of the bearing plate 11. The air inlet pipe 71 is connected to the side of the integrated fairing 7. The air inlet end of the air inlet pipe 71 extends towards the outside of the central control base 1 to introduce an external air source. A plurality of air flow nozzles 72 are connected to the upper part of the integrated fairing 7 in a threaded manner. The integrated fairing 7 is located directly below the laser detector array 31. The air flow nozzles 72 are evenly distributed on the upper part of the integrated fairing 7, and the air outlet of the air flow nozzle 72 is an outwardly convex parabolic convex surface. The external air source enters the fairing through the air inlet pipe 71. The air inlet pipe 71 is connected to the external air source through a flange. The parabolic air flow nozzle 72 sprays upward to form a floating air cushion, inducing micro-vibration of the blank to identify hidden cracks.

[0037] As Figures 8 - 11 shown in the figure, it also includes a carrier rod 8, a limiting roller 81, a contact block 82 and a spring three 83. The carrier rods 8 are symmetrically arranged on both sides of the upper part of the bearing plate 11 near the middle. The limiting roller 81 is rotatably connected between the two carrier rods 8 through bearings. There are a plurality of contact blocks 82. The plurality of contact blocks 82 are slidably inserted into the limiting roller 81 along the radial direction. The number of springs three 83 is the same as that of the contact blocks 82. The springs three 83 are welded to the sliding connection between the contact block 82 and the limiting roller 81. In the initial state, the contact block 82 connected to the spring three 83 slides out of the limiting roller 81. The contact block 82 protrudes from the roller surface under the action of the spring three 83 to form a multi-point elastic contact to detect abnormal concavities and convexities on the surface of the blank, which can additionally assist the torque sensor.

[0038] As Figure 1 、 Figure 3 、 Figure 4 、 Figure 10 and Figure 11 shown in the figure, it also includes a driving slide rail frame 9, a slide seat 91, an electric push rod two 92 and a marking pen two 93. The driving slide rail frame 9 is bolted and fixed at the rear part of the upper part of the bearing plate 11. The upper part of the driving slide rail frame 9 is a slide rail module. The slide seat 91 is slidably installed in the slide rail module. The slide seat 91 has a clearance fit with the slide rail module. The side part of the slide seat 91 protrudes from the inside of the slide rail module. The electric push rod two 92 is bolted and fixed on the protruding part of the slide seat 91. The marking pen two 93 is connected to the telescopic end of the electric push rod two 92. The slide seat 91 moves horizontally along the slide rail module. The electric push rod two 92 controls the pressing depth of the marking pen two 93 according to the defect area level (the marks for large-area defects are more obvious).

[0039] When the device starts up, the built-in controller of the central control base 1 automatically executes the initialization program, performs an idling test on the conveying roller group 2, confirms that the rotation speed is stable within the preset range, calibrates the focal length of the laser detector array 31 to ensure that the scanning accuracy meets the standard, the dynamic feedback sensor 57 performs zero reset to establish the thickness reference parameter, the horizontal illuminator 6 starts the infrared ray 61 calibration to ensure that the infrared rays 61 on both sides form an overlapping light spot at the midline of the bearing plate 11. After the air inlet pipe 71 connects to the external air source to establish pressure, when the internal air pressure of the integrated air deflector 7 reaches, the air inlet valve is automatically locked, and the air flow nozzle 72 performs a pulse test to verify that the air outlet trajectory meets the requirements;

[0040] When the cigarette box cardboard blank (referred to as the blank) enters the device, the input conveying roller group 2 operates in a differential speed mode to moderately tension the blank. The positioning roller group 43 forms an adaptive clamping channel through the action of the spring one 42 of the moving frame 41. The contact block 82 of the limiting roller 81 protrudes from the roller surface under the action of the spring three 83 to form a multi-point contact type guide;

[0041] When the blank passes through the thickness detection mechanism, the contact roller 55 and the pushing roller 54 form a detection channel with a gap. When a normal-sized blank passes through, the contact roller 55 only has a small displacement fluctuation. When the thickness exceeds the standard, the contact roller 55 moves upward to trigger the dynamic feedback sensor 57, and the actuator 53 immediately reduces the rotation speed of the pushing roller 54. The electric push rod one 51 immediately descends, causing the marking pen one 52 to mark the abnormal point on the surface of the blank. The control system of the hollow base records the abnormal coordinates and generates a thickness exceeding standard alarm code. If the thickness is insufficient and the infrared ray 61 of the horizontal illuminator 6 is not blocked by the side of the blank, a secondary marking will be triggered, and the electric push rod one 51 performs a secondary descent;

[0042] The blank that passes through the thickness detection enters the core detection area. The laser detector array 31 performs multi-modal scanning. The line laser scans the surface micro-defects, and the area array laser performs three-dimensional topography reconstruction. The air flow assisted detection system works together. The air flow nozzle 72 sprays upward with a suitable specification pressure to form a floating air cushion at the bottom of the blank. When there are hidden cracks in the blank, the air cushion pressure fluctuation increases, and the laser detector identifies the defect through the surface micro-vibration amplitude. When a defect is detected, the sliding seat 91 moves horizontally along the driving slide rail frame 9, and the electric push rod two 92 performs hierarchical marking according to the defect area;

[0043] When there are concave and convex defects on the blank, the amount of expansion and contraction generated by the contact block 82 under the action of the spring three 83, the limiting roller 81 can detect the change of the rotational resistance through the sensitivity of the externally provided torque sensor. If it is detected that multiple contact blocks 82 slide out of the limiting roller 81 at the same time, the device will synchronously adjust the rotation speed of the conveying roller group 2 and increase the pressurized air flow for prompting.

[0044] The above embodiments are provided for those skilled in the art to implement or use the present invention. Those skilled in the art can make various modifications or changes to the above embodiments without departing from the inventive concept of the present invention. Therefore, the protection scope of the present invention is not limited by the above embodiments, but should be the maximum scope that conforms to the innovative features mentioned in the claims.

Claims

1. A precise defect detection device for cigarette box cardboard blanks by laser scanning, characterized in that: It includes a central control base (1). A controller unit is provided on the side of the central control base (1). The controller unit of the central control base (1) is electrically connected to each power component. A bearing plate (11) is fixed in the central area of the upper part of the central control base (1). Conveyor roller groups (2) are symmetrically installed at the input end and the output end of the central control base (1). A mounting frame (3) is fixed across the upper part of the bearing plate (11). A laser detector array (31) is symmetrically arranged on the upper part of the mounting frame (3). There are four restraint seats (4), and the four restraint seats (4) are respectively installed at the four corners of the bearing plate (11). There are two moving frames (41), and the two moving frames (41) are respectively slidably connected between the two restraint seats (4) on the same side. First springs (42) are symmetrically connected at the sliding connection between the restraint seats (4) and the moving frames (41). Positioning roller groups (43) are symmetrically installed on both sides of the two moving frames (41). A bracket (5) is arranged between the fronts of the two moving frames (41). A first electric push rod (51) is vertically installed in the middle of the bracket (5). A first marking pen (52) is connected to the telescopic end of the first electric push rod (51). Thickness detection mechanisms are provided on both sides of the fronts of the two moving frames (41); the thickness detection mechanism includes an actuator (53), a pushing roller (54), auxiliary support rods (541), a contact roller (55), a second spring (56), and a dynamic feedback sensor (57). The actuator (53) is embedded and installed on both sides of the lower part of the bracket (5). The actuator (53) is electrically connected to the first electric push rod (51). The pushing roller (54) is arranged at the lower front part inside the moving frame (41). The auxiliary support rods (541) are symmetrically installed at the upper front part inside the moving frame (41). The contact roller (55) is slidably connected between the two auxiliary support rods (541). The contact roller (55) and the pushing roller (54) are in a vertically parallel state. The middle part of the contact roller (55) is a rotating part. The second springs (56) are symmetrically connected at the sliding connection between the auxiliary support rods (541) and the contact roller (55). The dynamic feedback sensor (57) is installed on the upper part of the auxiliary support rod (541). The dynamic feedback sensor (57) is close to the sliding connection between the auxiliary support rod (541) and the contact roller (55). The dynamic feedback sensor (57) is signal-connected to the actuator (53); It also includes an integrated air deflector (7), an air inlet pipe (71), and air nozzles (72). The integrated air deflector (7) is arranged in the middle of the upper part of the bearing plate (11). The air inlet pipe (71) is connected to the side of the integrated air deflector (7). The air inlet end of the air inlet pipe (71) extends towards the outside of the central control base (1) to introduce an external air source. A plurality of air nozzles (72) are connected to the upper part of the integrated air deflector (7); The integrated air deflector (7) is located directly below the laser detector array (31). The air nozzles (72) are evenly dispersed on the upper part of the integrated air deflector (7), and the air outlet of the air nozzle (72) is a convex parabolic surface that protrudes outward;When the blank passes through the detection channel where there is a gap formed by the contact roller (55) and the pushing roller (54), when the thickness of the blank exceeds the standard, the contact roller (55) moves upward to trigger the dynamic feedback sensor (57), and the actuator (53) immediately reduces the rotation speed of the pushing roller (54), and the electric push rod one (51) immediately descends, so that the marking pen one (52) marks the abnormal point on the surface of the blank.

2. The precise defect detection device for cigarette box cardboard blanks by laser scanning according to claim 1, characterized in that: It further includes a horizontal irradiator (6), and the horizontal irradiator (6) is symmetrically installed on both sides of the front part of the moving frame (41), and the horizontal irradiator (6) is located below the bracket (5).

3. The precise defect detection device for cigarette box cardboard blanks by laser scanning according to claim 2, characterized in that: The emission ends of the horizontal irradiators (6) on both sides are arranged facing each other, and the infrared rays (61) of the two are at the same horizontal height and overlap, so as to confirm that the cardboard blank is in a horizontal state.

4. A precise defect detection device for cigarette box cardboard blanks by laser scanning, characterized in that: It further includes a carrier rod (8), a limiting roller (81), a contact block (82) and a third spring (83). The carrier rod (8) is symmetrically arranged on both sides of the upper part of the bearing plate (11) near the middle. The limiting roller (81) is rotatably connected between the two carrier rods (8). There are multiple contact blocks (82), and the multiple contact blocks (82) are radially slidably inserted into the interior of the limiting roller (81). The number of the third springs (83) is the same as that of the contact blocks (82). The third springs (83) are connected to the sliding joints of the contact blocks (82) and the limiting roller (81). In the initial state, the contact blocks (82) connected to the third springs (83) slide out of the limiting roller (81).

5. The precision defect detection equipment for cigarette box cardboard blanks by laser scanning according to claim 4, characterized in that: It further includes a driving slide rail frame (9), a slide seat (91), a second electric push rod (92) and a second marking pen (93). The driving slide rail frame (9) is installed at the rear of the upper part of the bearing plate (11). The upper part of the driving slide rail frame (9) is a slide rail module. The slide seat (91) is slidably installed in the slide rail module. The side part of the slide seat (91) protrudes from the interior of the slide rail module. The second electric push rod (92) is installed on the protruding part of the slide seat (91). The second marking pen (93) is connected to the telescopic end of the second electric push rod (92).

Images