Laser scanning type cigarette case paperboard blank accurate defect detection equipment

Abstract

The invention relates to the technical field of cigarette case paperboard appearance detection, in particular to laser scanning type cigarette case paperboard blank accurate defect detection equipment which comprises a central control machine base, a controller unit is arranged on the side portion of the central control machine base, the controller unit of the central control machine base is connected with electric power components through wires, and a bearing plate is fixed to the central area of the upper portion of the central control machine base. The conveying roller sets are symmetrically installed at the input end and the output end of the center control machine base. Through cooperative configuration of a laser detector array and a thickness detection mechanism, surface microdefects and thickness abnormity are synchronously detected, the problem that traditional step-by-step detection is low in efficiency is solved, and speed measurement is improved; an elastic positioning system is formed by the moving frame and the first spring and is matched with differential operation of the conveying roller set, self-adaptive clamping of the surface of the blank is achieved, constant clamping force is kept, and the defect of creases caused by rigid clamping is avoided; the telescopic rod of the first electric push rod drives the first marking pen to move vertically, and the positioning precision can be improved by combining real-time data of a dynamic feedback sensor of the thickness detection mechanism.

Description

Technical Field

[0001] The 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. Background Art

[0002] Cigarette box cardboard is the main structural material for cigarette packaging. It is made of a mixture of wood pulp and other chemical fibers. Some ingredients such as bleached hemp pulp may be added. It is often used in combination with a metal foil layer (such as aluminum foil) to form a multi-layer composite material with both barrier and protection functions.

[0003] Detection of appearance defects in cigarette box cardboard blanks is a crucial step in the production process, because surface defects (such as missing prints, stains, scratches, etc.) will directly affect the appearance of the packaging, and even cause color differences, misprints, and other problems in the printed products, damaging consumers' trust in the brand.

[0004] At present, the inspection of cigarette box cardboard blanks generally adopts a step-by-step inspection process, which requires independent equipment to complete surface defect identification and thickness anomaly detection respectively, resulting in low inspection efficiency. In addition, repeated clamping during the step-by-step inspection process can easily cause cardboard crease defects. In addition, the traditional rigid clamping device used for cigarette box cardboard blank inspection is often unable to adapt to small and medium-sized width changes, resulting in frequent manual adjustment of positioning parameters, and a large fluctuation range of clamping force, which can easily cause material deformation or indentation.

[0005] To this end, a laser scanning cigarette box cardboard blank precision defect detection equipment is specially designed to solve the above technical problems. Summary of the invention

[0006] In order to overcome the shortcomings of the above-mentioned prior art, the present invention provides a laser scanning type cigarette box paperboard blank precision defect detection device.

[0007] The technical implementation scheme of the present invention is: a laser scanning type cigarette box cardboard blank precision defect detection equipment, 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 each power component, a bearing plate is fixed to the upper central area of ​​the central control base, a conveying roller group is symmetrically installed at the input end and the output end of the central control base, a mounting frame is fixed across the upper part of the bearing plate, a laser detector array is symmetrically arranged on the upper part of the mounting frame, there are four constraint seats, and the four constraint seats are respectively installed on each corner of the bearing plate, there are two mobile frames, and the two mobile frames are respectively slidably connected between the two constraint seats on the same side, a spring is symmetrically connected at the sliding connection between the constraint seat and the mobile frame, a positioning roller group is symmetrically installed on both sides of the two mobile frames, a bracket is arranged between the front parts of the two mobile frames, an electric push rod is vertically installed in the middle of the bracket, a marking pen is connected to the telescopic end of the electric push rod, and thickness detection mechanisms of auxiliary positioning roller groups are provided on both sides of the front of the two mobile frames.

[0008] Optionally, the thickness detection mechanism includes an actuator, a push roller, an auxiliary support rod, a contact roller, a second spring and a dynamic feedback sensor. The actuator is embedded in both sides of the lower part of the bracket, the actuator is connected to an electric push rod with an electric wire, the push roller is arranged at the lower front part of the mobile frame, the auxiliary support rod is symmetrically installed at the upper front part of the mobile frame, the contact roller is slidably connected between the two auxiliary support rods, the contact roller and the push roller are parallel to each other, the middle part of the contact roller is a rotating part, the second spring is symmetrically connected to the sliding connection between 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 between the auxiliary support rod and the contact roller, and the dynamic feedback sensor is connected to the actuator signal.

[0009] Optionally, a horizontal irradiator is also included, which is symmetrically installed on both sides of the front of the mobile frame and is located below the bracket.

[0010] Optionally, the emission ends of the horizontal irradiators on both sides are arranged to face each other, and the infrared rays of the two are at the same level, forming an overlap, so as to confirm that the paperboard blank is in a horizontal state.

[0011] Optionally, it also includes an integrated air deflector, an air intake pipe and an air flow nozzle. The integrated air deflector is arranged in the middle of the upper part of the supporting plate, the air intake pipe is connected to the side of the integrated air deflector, and the air intake end of the air intake pipe extends toward the outside of the central control base to provide for the intervention of an external air source. The upper part of the integrated air deflector is connected to multiple air flow nozzles.

[0012] Optionally, the integrated air guide cover is located directly below the laser detector array, the air flow nozzles are evenly dispersed on the upper part of the integrated air guide cover, and the air outlets of the air flow nozzles are in the form of an outwardly convex parabolic convex surface.

[0013] Optionally, it also includes a carrier rod, a limiting roller, a contact block and a spring three. The carrier rods are symmetrically arranged on both sides of the upper part of the carrier plate near the middle. The limiting roller is rotatably connected between the two carrier rods. There are multiple contact blocks, and the multiple contact blocks are axially slidably embedded in the limiting roller. The spring three is equal to the number of contact blocks. The spring three is connected to the sliding connection between the contact block and the limiting roller. In the initial state, the contact block connected to the spring three slides and protrudes out of the outside of the limiting roller.

[0014] Optionally, it also includes a driving slide frame, a slide seat, two electric push rods and two marking pens. The driving slide frame is installed at the rear of the upper part of the supporting plate. The upper part of the driving slide frame is a slide module. The slide seat is slidably installed in the slide module. The side of the slide seat protrudes from the inside of the slide module. The two electric push rods are installed on the protruding part of the slide seat. The two marking pens are connected to the telescopic end of the two electric push rods.

[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, surface microscopic defects and thickness anomalies are detected synchronously, the problem of low efficiency of traditional step-by-step detection is solved, and the measurement speed is improved; the movable 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.

[0016] 2. The physical contact measurement of the contact roller and the infrared ray blocking detection of the horizontal irradiator form a complementary mechanism. When there is a thickness deviation, the electric push rod drives the marking pen to automatically perform double marking to reduce the false detection rate.

[0017] 3. The suspended air cushion generated by the parabolic airflow nozzle can cause the blank to produce a small micro-vibration. Combined with the vibration mode analysis of the laser detector array, the recognition rate of internal cracks in 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 and protrude from the limit roller at the same time, the central control base will automatically adjust the conveying speed and start the air flow boost to prevent the defects from expanding.

[0019] 5. Through the lateral movement of the slide along the slide rail module and the linkage with the telescopic action of the electric push rod 2, the marking mode point, line, and surface can be automatically selected according to the defect area, realizing the data binding of the defect type and the marking graphic, which is convenient for rapid sorting in subsequent processes. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0021] Figure 2 It is a three-dimensional structural schematic diagram of the conveying roller group, the mounting frame, the restraining seat and other components of the present invention.

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

[0023] Figure 4 It is a cross-sectional schematic diagram of the horizontal irradiator, the integrated air guide cover, the driving slide rail frame and other components of the present invention.

[0024] Figure 5 It is a three-dimensional structural schematic diagram of the restraining seat, bracket and part A of the present invention.

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

[0026] Figure 7 It is a schematic cross-sectional view of the components of the present invention, such as the restraining seat, the moving frame and the horizontal irradiator.

[0027] Figure 8 It is a schematic diagram of the cross-sectional structure of the horizontal irradiator, integrated guide cover, limiting roller and other components of the present invention.

[0028] Fig. 9 It is a schematic cross-sectional structural diagram of the limiting roller, the contact block and the spring of the present invention in an initial state.

[0029] Fig.10 It is a plan view of the bearing plate, positioning roller group, pushing roller and other components of the present invention.

[0030] Fig.11 It is a schematic plan cross-sectional view of components such as a carrier plate, a mounting frame and a laser detector array of the present invention.

[0031] The markings of the components in the accompanying drawings are as follows: 1: central control base, 11: carrying plate, 2: conveyor roller group, 3: mounting frame, 31: laser detector array, 4: constraint seat, 41: moving frame, 42: spring one, 43: positioning roller group, 5: bracket, 51: electric push rod one, 52: marking pen one, 53: actuator, 54: push roller, 541: auxiliary support rod, 55: contact roller, 56: spring two, 57: dynamic feedback sensor, 6: horizontal irradiator, 61: infrared ray, 7: integrated guide cover, 71: air intake pipe, 72: air flow nozzle, 8: carrying rod, 81: limiting roller, 82: contact block, 83: spring three, 9: driving slide frame, 91: slide seat, 92: electric push rod two, 93: marking pen two. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings. It is hereby stated that the directional terms such as up, down, left, right, front, back, inside, outside, etc. that appear or will appear in the text of the present invention are only based on the accompanying drawings of the present invention, and are not specific limitations of the present invention.

[0033] Embodiment: A laser scanning cigarette box paperboard blank precision defect detection device, such as Figure 1-Figure 8 , Fig.10 and Fig.11As shown, it includes a central control base 1, a central control base 1, and a controller unit on the side of the central control base 1. The controller unit of the central control base 1 realizes signal interaction with each power component through a wire connection (cable / data line), executes initialization procedures, parameter calibration and abnormal alarms, and coordinates the operation of each power component. The carrier plate 11 is fixed to the central area of ​​the upper part of the central control base 1 by bolts. The carrier plate 11 provides structural support and 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 transmits the cardboard blank. The mounting frame 3 is fixed across the upper part of the carrier 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 performs surface micro defect (missing printing, scratches) scanning and three-dimensional morphology reconstruction, and identifies hidden cracks (combined with subsequent air cushion vibration analysis). There are four constraint seats 4, and the four constraint seats 4 are respectively installed on each side of the carrier plate 11 There are two moving frames 41 on the corner, and the two moving frames 41 are respectively slidably connected between the two constraint seats 4 on the same side. A spring 42 is symmetrically connected at the sliding connection between the constraint seat 4 and the moving frame 41. Under the elastic action of the spring 42, the moving frame 41 slides along the constraint seat 4 to adapt to small and medium width blanks, maintain a constant clamping force, and avoid 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 stabilize the position of the blank through elastic pressure. The conveying roller group 2 tensions the blank through differential operation, and cooperates with the positioning roller group 43 to achieve stable conveying. The bracket 5 is arranged between the front parts of the two moving frames 41, and the electric push rod 51 is vertically installed in the middle part of the bracket 5. The marking pen 52 is connected to the telescopic end of the electric push rod 51, and the electric push rod 51 drives the marking pen 52 to move vertically. Thickness detection mechanisms are provided on both sides of the front of the two moving frames 41.

[0034] like Figure 2-Figure 7 and Fig.10As shown, the thickness detection mechanism includes an actuator 53, a push roller 54, an auxiliary support rod 541, a contact roller 55, a spring 56 and a dynamic feedback sensor 57. The actuator 53 is embeddedly installed on both sides of the lower part of the bracket 5 by bolts. The actuator 53 is connected to the electric push rod 51 by wires. The push roller 54 is set at the lower front part of the moving frame 41 through a bearing. The auxiliary support rod 541 is symmetrically installed at the upper 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 push roller 54 are in a state of being parallel to each other. The middle part of the contact roller 55 is a rotating part. The push roller 54 and the contact roller 55 A detection channel is formed to drive the blank through the thickness detection area. The spring 2 56 is symmetrically connected to the sliding connection between the auxiliary support rod 541 and the contact roller 55. The contact roller 55 floats elastically through the spring 2 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 push roller 54. 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 connected to the actuator 53 signal.

[0035] like Figure 4 , Figure 7 , Figure 8 and Fig.10 As shown, a horizontal irradiator 6 is also included. The horizontal irradiator 6 is symmetrically installed on both sides of the front of the mobile frame 41 by 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 transmitting 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, forming an overlap, so as to confirm that the paperboard blank is in a horizontal state, and the infrared rays 61 on both sides form overlapping light spots at the center line of the carrier plate 11 to verify the horizontality of the blank, and trigger a secondary mark when the thickness is insufficient.

[0036] like Figure 1 , Figure 3 , Figure 4 , Figure 8 , Fig.10 and Fig.11As shown, it also includes an integrated air guide cover 7, an air intake pipe 71 and an air flow nozzle 72. The integrated air guide cover 7 is bolted to the middle of the upper part of the carrier plate 11, and the air intake pipe 71 is connected to the side of the integrated air guide cover 7. The air intake end of the air intake pipe 71 extends toward the outside of the central control base 1 for the intervention of an external air source. The upper part of the integrated air guide cover 7 is connected with a plurality of air flow nozzles 72 in a threaded manner; the integrated air guide cover 7 is located directly below the laser detector array 31, and the air flow nozzles 72 are evenly dispersed on the upper part of the integrated air guide cover 7, and the air outlet of the air flow nozzle 72 is an outwardly convex parabolic convex surface, and the external air source enters the air guide cover through the air intake pipe 71, and the air intake pipe 71 is connected to the external air source through a flange, and the parabolic air flow nozzle 72 sprays upward to form a suspended air cushion, inducing micro-vibration of the blank to identify hidden cracks.

[0037] like Figure 8-Figure 11 As shown, it also includes a carrier rod 8, a limiting roller 81, a contact block 82 and a spring three 83. The carrier rod 8 is symmetrically arranged on both sides of the upper part of the carrier plate 11 near the middle. The limiting roller 81 is rotatably connected between the two carrier rods 8 through a bearing. There are multiple contact blocks 82, and the multiple contact blocks 82 are axially slidably embedded in the limiting roller 81. The spring three 83 is equal to the number of the contact blocks 82. The spring three 83 is 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 and protrudes from the outside 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 unevenness on the surface of the blank, which can additionally assist the torque sensor.

[0038] like Figure 1 , Figure 3 , Figure 4 , Fig.10 and Fig.11 As shown, it also includes a driving slide frame 9, a slide seat 91, an electric push rod 92 and a marking pen 93. The driving slide frame 9 is bolted to the rear of the upper part of the bearing plate 11. The upper part of the driving slide frame 9 is a slide rail module. The slide seat 91 is slidably installed in the slide rail module. The slide seat 91 and the slide rail module are clearance-matched. The side of the slide seat 91 protrudes from the inside of the slide rail module. The electric push rod 92 is bolted to the protruding part of the slide seat 91. The marking pen 93 is connected to the telescopic end of the electric push rod 92. The slide seat 91 moves laterally along the slide rail module. The electric push rod 92 controls the pressing depth of the marking pen 93 according to the defect area classification (large area defects are more obviously marked).

[0039] When the equipment is started, the built-in controller of the central control base 1 automatically executes the initialization procedure, the conveying roller group 2 is tested for idling to confirm that the speed is stable in the preset range, the laser detector array 31 performs focal length calibration to ensure that the scanning accuracy meets the standard, the dynamic feedback sensor 57 performs zero point reset to establish thickness reference parameters, the horizontal irradiator 6 starts the infrared ray 61 calibration to ensure that the infrared rays 61 on both sides form overlapping light spots at the center line of the carrier plate 11, the air intake pipe 71 is connected to the external air source to establish pressure, and the air intake valve of the integrated air guide cover 7 is automatically locked when the internal air pressure reaches the required pressure, and the air flow nozzle 72 performs a pulse test to verify that the air outlet trajectory meets the requirements; When the cigarette box paperboard blank (hereinafter referred to as blank) enters the equipment, the input end conveying roller group 2 operates in differential mode to make the blank appropriately tensioned, and the positioning roller group 43 forms an adaptive clamping channel through the action of the spring 1 42 of the moving frame 41, and the contact block 82 of the limiting roller 81 protrudes from the roller surface under the action of the spring 3 83 to form a multi-point contact guide; When the stock passes through the thickness detection mechanism, the contact roller 55 and the push roller 54 form a gap detection channel. When the stock of normal size passes through, the contact roller 55 only produces a small displacement fluctuation. When the thickness exceeds the standard, the contact roller 55 moves up to trigger the dynamic feedback sensor 57, and the actuator 53 immediately reduces the speed of the push roller 54, and the electric push rod 51 immediately descends, so that the marking pen 52 marks the abnormal point on the surface of the stock. The control system of the hollow machine base records the abnormal coordinates and generates an alarm code for excessive thickness. If the thickness is insufficient, the infrared ray 61 of the horizontal irradiator 6 is not blocked by the side of the stock, which will trigger the secondary mark, and the electric push rod 51 performs the secondary descent; The blank that has passed the thickness inspection enters the core inspection area, and the laser detector array 31 performs multi-modal scanning. The line laser scans the surface microscopic defects, and the area array laser performs three-dimensional morphology reconstruction. The airflow auxiliary detection system works together, and the airflow nozzle 72 sprays upward with a suitable pressure to form a suspended 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 slide 91 moves laterally along the driving slide rail frame 9, and the electric push rod 2 92 performs graded marking according to the defect area; When there are concave-convex defects in the blank, the contact block 82 will expand and contract under the action of spring three 83, and the limit roller 81 can detect the change in rotational resistance through the sensitivity of the external torque sensor. If it is detected that multiple contact blocks 82 slide and protrude from the limit roller 81 at the same time, the equipment will synchronously adjust the rotation speed of the conveying roller group 2 and pressurize the airflow for prompting.

[0040] The above embodiments are provided for persons familiar with the art to implement or use the present invention. Personnel familiar with 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 to the above embodiments, but should be the maximum scope of the innovative features mentioned in the claims.

Claims

1. A laser scanning cigarette box paperboard blank precision defect detection device, characterized by: The invention comprises a central control base (1), the side of the central control base (1) is provided with a controller unit, the controller unit of the central control base (1) is connected with electric wires of various power components, a carrier plate (11) is fixed to the central area of ​​the upper part of the central control base (1), a conveying roller group (2) is 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 carrier plate (11), a laser detector array (31) is symmetrically arranged on the upper part of the mounting frame (3), there are four restraining seats (4), the four restraining seats (4) are respectively installed on each corner of the carrier plate (11), and a movable frame (31) is provided. There are two (41), the two moving frames (41) are respectively slidably connected between the two restraining seats (4) on the same side, a spring (42) is symmetrically connected to the sliding connection between the restraining seat (4) and the moving frame (41), a positioning roller group (43) is symmetrically installed on both sides of the two moving frames (41), a bracket (5) is arranged between the front parts of the two moving frames (41), an electric push rod (51) is vertically installed in the middle part of the bracket (5), a marking pen (52) is connected to the telescopic end of the electric push rod (51), and thickness detection mechanisms are arranged on both sides of the front parts of the two moving frames (41).

2. According to the laser scanning type cigarette box paperboard blank precision defect detection equipment according to claim 1, it is characterized by: The thickness detection mechanism comprises an actuator (53), a push 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 embeddedly installed on both sides of the lower part of the bracket (5). The actuator (53) is connected to the electric push rod (51) by electric wires. The push roller (54) is arranged at the lower front part of the moving frame (41). The auxiliary support rod (541) is symmetrically installed at the upper front part of the moving frame (41). The contact roller (55) is slidably connected to the two springs. The auxiliary support rods (541) are arranged between the contact roller (55) and the push roller (54) in a vertically parallel state. The middle of the contact roller (55) is a rotating part. The second spring (56) is symmetrically connected to the sliding connection between the auxiliary support rod (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 connected to the actuator (53) by signal.

3. According to the laser scanning type cigarette box paperboard blank precision defect detection device according to claim 2, it is characterized by: It also includes a horizontal irradiator (6), which is symmetrically mounted on both sides of the front of the movable frame (41), and the horizontal irradiator (6) is located below the bracket (5).

4. A laser scanning cigarette box paperboard blank precision defect detection device according to claim 3, 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 level and overlap, thereby confirming that the paperboard blank is in a horizontal state.

5. According to the laser scanning type cigarette box paperboard blank precision defect detection device of claim 4, it is characterized by: It also includes an integrated air guide cover (7), an air intake pipe (71) and an air flow nozzle (72). The integrated air guide cover (7) is arranged in the middle of the upper part of the carrier plate (11). The air intake pipe (71) is connected to the side of the integrated air guide cover (7). The air intake end of the air intake pipe (71) extends toward the outside of the central control base (1) to provide access to an external air source. The upper part of the integrated air guide cover (7) is connected to a plurality of air flow nozzles (72).

6. A laser scanning cigarette box paperboard blank precision defect detection device according to claim 5, characterized in that: The integrated air guide cover (7) is located directly below the laser detector array (31), the air flow nozzles (72) are evenly dispersed on the upper part of the integrated air guide cover (7), and the air outlets of the air flow nozzles (72) are in the form of an outwardly convex parabolic convex surface.

7. A laser scanning cigarette box paperboard blank precision defect detection device according to claim 6, characterized in that: It also includes a carrier rod (8), a limiting roller (81), a contact block (82) and a spring three (83), wherein the carrier rod (8) is symmetrically arranged on both sides of the upper part of the carrier plate (11) near the middle part, the limiting roller (81) is rotatably connected between the two carrier rods (8), there are a plurality of contact blocks (82), the plurality of contact blocks (82) are axially slidably embedded in the limiting roller (81), the spring three (83) is equal in number to the contact blocks (82), the spring three (83) is connected to the sliding connection between the contact block (82) and the limiting roller (81), and in the initial state, the contact block (82) connected to the spring three (83) slides and protrudes outside the limiting roller (81).

8. A laser scanning cigarette box paperboard blank precision defect detection device according to claim 7, characterized in that: It also includes a driving rail frame (9), a slide seat (91), two electric push rods (92) and two marking pens (93). The driving rail frame (9) is installed at the upper rear of the bearing plate (11). The upper part of the driving rail frame (9) is a rail module. The slide seat (91) is slidably installed in the rail module. The side of the slide seat (91) protrudes from the inside of the rail module. The two electric push rods (92) are installed on the protruding part of the slide seat (91). The two marking pens (93) are connected to the telescopic end of the two electric push rods (92).

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