An on-line detection and reject method and apparatus for a printing bag making machine

Abstract

The application discloses an online detection and waste product rejection method and device for a printing bag making machine, and realizes defect identification and accurate matching of a cutting bag body position through cooperation of an online detection system and an encoder; the cut bag body is introduced into a first conveying belt, and a suction wheel at the end of the first conveying belt is controlled to generate negative pressure to adsorb a defective product bag and sequentially throw out the defective product bag to a waste product collection area; under a multi-column parallel discharging condition, if there is a waste product in a column and the waste product is rejected, a suction wheel at the end of a second conveying belt is controlled to adsorb qualified bags in the same row and the rest parallel channels and throw out the qualified bags to a qualified product collection area for storage; and the whole row of qualified bags which are not rejected by the two-stage waste product rejection are sent to a discharge port through a third conveying belt. The application realizes high-speed nondestructive interception of defective bag bodies, and effectively solves the problem of unbalanced counting of qualified bag bodies in each column under the multi-column parallel discharging condition.

Description

Technical Field

[0001] This invention belongs to the field of packaging machinery and printing quality control technology, specifically relating to an online detection and waste rejection method and device for a printing bag making machine. Background Technology

[0002] With the development of technology and equipment, machine vision inspection technology has become an important means for large and medium-sized printing enterprises in China to solve quality problems. While addressing labor shortages, it maximizes inspection efficiency and ensures the uniqueness of inspection results. In bag production, ensuring that every bag leaving the factory meets quality standards is a fundamental requirement.

[0003] A bag-making machine is an automated device that processes rolls of film into bags through multiple steps. The main components and production process of a bag-making machine are as follows: Rolls of film raw materials (such as plastic film, composite film, paper-plastic composite film, etc.) are mounted on an unwinding frame and pulled smoothly into the production line by a traction system. During the journey, the film's edges are aligned by a correction device, and it remains flat through tension control and a flattening mechanism. The flattened film then enters the sealing area. According to the pre-set bag shape, the longitudinal sealing device and the transverse sealing device operate sequentially, bonding the film in specific areas through heating and pressure to form a continuous bag tube with sealed edges. The sealed continuous bag tube is then sent to the cutting station. The control system calculates the conveying length and controls the cutting blade to precisely cut the bag tube into individual, sealed finished bags. The cut finished bags are conveyed to the discharge port by a conveyor belt, counted, and sorted before being packaged and stored.

[0004] However, the existing bag manufacturing process still has the following problems in terms of quality inspection and waste disposal: First, traditional inspection methods mainly rely on manual visual inspection at the end of the production line, which is not only inefficient and costly, but also easily affected by factors such as subjective fatigue of inspectors and blind spots, resulting in missed defects. Secondly, bag making machines are high-speed, continuous operating equipment. If waste products are generated during the printing or processing process and cannot be detected and removed online in time, it will result in a large amount of raw material waste. In addition, additional manpower will be required for offline sorting, which will increase the production cost of the entire line. Third, when multiple rows of materials are discharged in parallel, there is a lack of online rejection mechanisms and diversion control methods to ensure the consistency of the quantity of subsequent packaging and stacking. Modern bag making machines have multiple parallel discharge modes, such as one-to-one, one-to-two, one-to-three, or one-to-four. Under the condition of parallel material conveying in multiple rows, if only single defective bags are physically rejected, it is easy to cause an imbalance in the count of qualified bags in each row, making it difficult to meet the requirements of automatic counting and sorting at the discharge port and the consistency of the quantity in each row during packaging and stacking.

[0005] Therefore, for roll bag making machine production lines, there is an urgent need for a waste removal method and device that can achieve real-time online detection of defective products, accurate automatic removal of single or multiple waste products under high-speed continuous operation, and ensure the consistency of the quantity of subsequent packaging and stacking materials. Summary of the Invention

[0006] The purpose of this invention is to overcome the shortcomings of existing technologies and provide an online detection and waste removal method and device for printing bag making machines. This addresses the technical problems of low efficiency, easy omissions, and inability to remove waste in a timely manner under high-speed continuous operation conditions, leading to material waste and high manual sorting costs. It also solves the technical defects of single-sheet waste removal disrupting the overall row counting balance and failing to meet downstream automated packaging and stacking requirements under multi-column parallel discharge conditions. By matching the online detection system with encoder position to achieve real-time locking of defective bags, and coordinating the flow control of a three-section conveyor belt assembly and a two-stage negative pressure adsorption waste removal mechanism, it can not only remove defective bags in a forward differential speed without damage, but also temporarily store the remaining qualified bags in the same row when a single row of waste is removed. This ensures that the number of qualified finished bags entering the discharge port remains strictly synchronized and aligned, meeting the requirements of automated counting, sorting, and packaging.

[0007] The first aspect of this invention provides an online detection and waste rejection method for a printing bag making machine, comprising the following steps: Online detection and position matching: During the operation of the roll film, the online detection system collects the printed image of the roll and generates a reject signal when a printing defect is detected in the corresponding bag area on the roll; the encoder connected to the bag making machine transmission mechanism detects the film conveying distance and performs position matching with the bags cut by the paper cutter. Multi-channel inlet conveyor: The cut parallel bags are introduced by the first conveyor belt. The first, second and third conveyor belts each include multiple parallel conveyor belts and form multiple conveyor channels corresponding to the number of discharge columns. The bags are conveyed forward by the second and third conveyor belts in sequence along the material conveying direction. First-level waste removal: When a defective bag is detected to be running to the end of the first conveyor belt, the high-speed negative pressure solenoid valve of the corresponding channel is controlled to conduct negative pressure airflow, so that the waste suction wheel of the bag making machine located at the diversion position between two adjacent conveyor belts at the end of the first conveyor belt generates negative pressure adsorption, adsorbs the defective bag and throws it out to the waste collection area; the remaining bags in the same row that are not removed enter the second conveyor belt; Second-level good product diversion: In the case of multiple parallel discharge, if there are defective products in the previous conveyor section and they are rejected, when the qualified bags in the other parallel channels of the row run to the end of the second conveyor belt, the high-speed negative pressure solenoid valve of the corresponding channel is controlled to conduct negative pressure airflow, so that the waste suction wheel of the bag making machine at the end of the second conveyor belt generates negative pressure adsorption, adsorbs and throws out the qualified bags in the other parallel channels of the row, and diverts them to the qualified product collection area for storage; Synchronous alignment and discharge: The entire row of qualified bags that have not been rejected by the two stages are conveyed to the discharge port by the third conveyor belt and enter the subsequent automated counting, sorting and packaging station.

[0008] Furthermore, in the first-stage waste rejection and second-stage good product sorting steps, the waste-kicking suction wheel of the bag-making machine is driven by an independent drive mechanism and rotates in the same direction as the bags running on each conveyor belt, controlling the outer circumferential linear speed of the waste-kicking suction wheel of the bag-making machine to be greater than the linear speed of the conveyor belt assembly.

[0009] Furthermore, in the single-row feeding mode (one out of one), the waste-kicking suction wheel of the bag-making machine at the end of the second conveyor belt remains idle and does not operate in the second-level good product diversion step; in the multi-row feeding mode (one out of two, one out of three or one out of four), the waste-kicking suction wheel of the bag-making machine at the end of the first conveyor belt and the waste-kicking suction wheel of the bag-making machine at the end of the second conveyor belt work together to perform waste rejection and diversion of good products in the same row.

[0010] A second aspect of the present invention provides an online detection and rejecting device for implementing the above-described method, characterized in that it comprises: The online inspection system is set on the running path of the roll film, including an image acquisition unit, which is used to acquire the printed image of the roll and generate a waste rejection signal when a printing defect is detected in the corresponding bag area on the roll. The encoder, connected to the transmission mechanism of the bag making machine, is used to detect the film conveying distance and match the position of the bag after it has been cut by the paper cutter. The conveyor belt assembly includes a first conveyor belt, a second conveyor belt, and a third conveyor belt arranged sequentially. Each of the first, second, and third conveyor belts includes multiple parallel conveyor belts. The first conveyor belt is used to connect to the rear end of the bag cutter of the bag making machine and to guide parallel bags in. The second conveyor belt is used to receive the bags conveyed by the first conveyor belt. The third conveyor belt is used to receive the bags conveyed by the second conveyor belt and continue to convey them forward to the discharge port. The waste removal mechanism includes two sets of waste removal components respectively disposed at the ends of the first conveyor belt and the second conveyor belt. Each set of waste removal components includes a transversely arranged waste removal suction wheel shaft and multiple bag-making machine waste removal suction wheels mounted on the waste removal suction wheel shaft. The bag-making machine waste removal suction wheels are located at the diversion position between two adjacent conveyor belts at the end of the conveyor belt, and have multiple suction holes along the circumferential direction on their outer circumferential surface. The bag-making machine waste removal suction wheel at the end of the first conveyor belt is used to absorb and throw out the defective bag when a defective bag is detected, and reject it to the waste collection area. The bag-making machine waste removal suction wheel at the end of the second conveyor belt is used to absorb and throw out the corresponding qualified bag in the remaining parallel channels of the row when a defective product exists in the previous conveying section and is rejected, and divert it to the qualified product collection area. Multiple high-speed negative pressure solenoid valves are provided. One end of each high-speed negative pressure solenoid valve is connected to a negative pressure source through a pipeline, and the other end is connected to the suction holes of the corresponding waste-removing suction wheel of the bag making machine through a pipeline. The valves are used to conduct negative pressure airflow when a rejection control signal is received, so that the corresponding suction holes generate negative pressure adsorption.

[0011] Furthermore, the online inspection system includes a front inspection camera arranged on the front side of the roll film, a back inspection camera arranged on the back side of the roll film, and an inspection host electrically connected to the front inspection camera and the back inspection camera.

[0012] Furthermore, a paper-pressing circular belt is provided above the second conveyor belt for automatically aligning and pressing the bags during transport.

[0013] Furthermore, the waste-kicking suction wheel shaft is driven by an independent drive mechanism, and the rotation direction of the waste-kicking suction wheel of the bag-making machine is the same as the running direction of the bag on the first conveyor belt, the second conveyor belt and the third conveyor belt, and the outer circumferential linear velocity of the waste-kicking suction wheel of the bag-making machine is greater than the linear velocity of the conveyor belt assembly.

[0014] Furthermore, the number of waste-kicking suction wheels of the bag-making machine at the end of the first conveyor belt and the end of the second conveyor belt is four each, arranged side by side along the width direction to correspond to the channel layout of one out of one, one out of two, one out of three or one out of four for the finished bags of materials.

[0015] Furthermore, the first conveyor belt, the second conveyor belt, and the third conveyor belt each include a transversely arranged conveyor roller shaft and multiple parallel conveyor circular belts sleeved on the conveyor roller shaft.

[0016] Furthermore, each of the bag-making machine's waste-kicking suction wheel locations is equipped with a bag-making machine waste-kicking suction wheel air-blowing seat and a bag-making machine waste-kicking suction wheel pad made of fabric-reinforced bakelite. The bag-making machine waste-kicking suction wheel air-blowing seat is fitted with an air passage plug.

[0017] Furthermore, the outer surface of the waste-kicking suction wheel of the bag-making machine is coated with Teflon.

[0018] Furthermore, a tensioning mechanism is provided below the conveyor belt assembly. The tensioning mechanism includes a horizontally arranged fixed shaft for the tensioning block of the bag-making machine waste-kick circular belt, a belt tensioning block slidably mounted on the fixed shaft of the bag-making machine waste-kick circular belt tensioning block, and a tensioning wheel mounted on the belt tensioning block via the bag-making machine waste-kick circular belt tensioning shaft; the tensioning wheel abuts against the corresponding conveyor circular belt.

[0019] Furthermore, the tensioning mechanism also includes a bearing fixing block that cooperates with the belt tensioning block, and the bearing fixing block is internally equipped with a deep groove ball bearing with sealing rings on both sides.

[0020] Compared with the prior art, the present invention has the following advantages: By configuring an online detection system that acquires front and back images along the roll film's running path, and combining it with an encoder to accurately map the conveying distance to the cut bags, the system changes the lagging mode of relying on manual visual sampling at the end of the traditional production line. Immediately after cutting, the system locks the physical location of defective bags and triggers the high-speed negative pressure solenoid valve of the corresponding channel, achieving instantaneous and accurate identification and interception of single or multiple defective bags. This effectively prevents defective products from flowing into downstream processes and significantly reduces raw material waste and subsequent manual sorting costs.

[0021] By setting up a waste rejection station at the end of the first conveyor belt and a good product diversion station at the end of the second conveyor belt, a two-level time-sequential linkage control mechanism is constructed. In the case of multiple parallel rows (one out of two to one out of four), when a defective bag is detected in a certain channel and is rejected separately at the first-level station, the second-level waste rejection component can controllably absorb and divert all the bags in the other qualified channels in the same row into the qualified product collection area for storage. This ensures that the material in that row is completely emptied at the second-level station, while the entire row of qualified material that follows passes through the second-level station and enters the third conveyor belt. This ensures that the number of qualified bags in each row that are finally sent to the discharge port on the main conveyor belt remains strictly synchronized and aligned, meeting the consistency requirements of subsequent automated sorting, stacking, and palletizing packaging.

[0022] The waste-kicking suction wheel is driven by an independent drive mechanism, and its rotation direction is consistent with the conveying direction. The linear speed of the outer circumference of the suction wheel is controlled to be greater than the linear speed of the conveyor belt. At the moment of negative pressure adsorption of the bag, a forward stretching and downward centrifugal swing torque is generated, which avoids the bag wrinkles, scratches and tears caused by rigid collisions of traditional cylinder push rods or mechanical swing arms. In addition, the Teflon coating on the outer surface of the suction wheel effectively prevents thin plastic film or composite film from adhering to the wheel surface during high-speed negative pressure adsorption, ensuring smooth material removal.

[0023] A paper-pressing circular belt is installed above the second conveyor belt to continuously and elastically press down on the receiving bags, achieving automatic flattening, alignment, and stable conveying without warping during the conveying process. An adjustment mechanism consisting of a tension block fixing shaft, belt tensioning block, and tensioning wheel is arranged below the conveyor assembly, which can independently adjust the tension of the conveyor belts in each channel, eliminating slippage and conveying deviation caused by uneven force on multiple belts, and improving the stability of high-speed continuous operation of multiple tracks of materials.

[0024] Each suction wheel is fitted with a blower seat and a pad made of fabric-reinforced bakelite on its side. The air distribution is concentrated and the airtightness is good, which reduces the lag in negative pressure response. The fabric-reinforced bakelite pad has excellent structural vibration isolation and thermal insulation positioning performance. Together with the bearing fixing block with double-sided sealed deep groove ball bearing, it effectively blocks the intrusion of dust and impurities, ensuring the mechanical stability and service life of the pneumatic waste removal mechanism under high-speed and frequent opening and closing conditions. Attached Figure Description

[0025] The present invention will be further described below with reference to the accompanying drawings and embodiments; Figure 1 This is a schematic diagram of the overall three-dimensional structure of an embodiment of the present invention; Figure 2 This is a top view of the structure according to an embodiment of the present invention; Figure 3 This is a side view of the structure according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the horizontal arrangement of the suction wheel and the air blowing seat assembly in an embodiment of the present invention.

[0026] Legend: 1. Deep groove ball bearing; 2. Socket head cap screw; 3. Waste removal suction wheel of bag making machine; 4. Air blowing seat of waste removal suction wheel of bag making machine; 5. Waste removal suction wheel pad of bag making machine; 6. Waste removal suction wheel shaft; 7. Waste removal circular belt of bag making machine; 8. Tensioning block fixing shaft of waste removal circular belt of bag making machine; 9. Tensioning wheel of waste removal circular belt of bag making machine; 10. Waste removal shaft of bag making machine; 11. Large washer; 12. Air passage plug; 13. Belt tensioning block; 14. Bearing fixing block; 15. Tensioning shaft of waste removal circular belt of bag making machine. Detailed Implementation

[0027] This section will describe in detail specific embodiments of the present invention. Preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and overall technical solution of the present invention, but they should not be construed as limiting the scope of protection of the present invention.

[0028] Example 1 This embodiment provides an online detection and waste rejection method for a printed bag making machine, applicable to an automated bag making production line including an unwinding traction mechanism, a heating and bonding device, a fixed-length bag cutter, a conveyor belt assembly, an online detection system, an encoder, and a waste rejection mechanism. The method includes the following specific steps: Step 1: Online detection and location matching During the high-speed continuous operation of the bag-making machine, the rolled film travels continuously after being unwound, tractioned, and leveled. Front and back inspection cameras, positioned on both sides of the roll's path and illuminated by high-brightness lighting, continuously capture images of the printed surface of the rapidly moving roll and transmit them to the inspection host. The inspection host uses image comparison algorithms to identify printing defects, color differences, or poor sealing in real time. Simultaneously, an encoder connected to the main drive mechanism of the bag-making machine detects and outputs pulse signals indicating the film's conveying distance. When a printing defect is detected, the system accurately calculates and maps the defect's coordinates on the roll to the corresponding bag number after cutting by the paper cutter, generating a defect location and rejection control signal based on the defect's coordinates on the roll and the current conveying distance.

[0029] Step 2, Multi-channel import and delivery After continuous sealing, the bag tubes enter the bag cutting station, where the fixed-length cutter cuts the bag tubes into individual finished bags. The cut parallel bags fall directly onto the first conveyor belt immediately below the rear end of the bag cutting blade. Multiple parallel conveyor belts receive them and smoothly guide them forward along the conveying path, where they are sequentially conveyed forward via the second and third conveyor belts along the material transport direction.

[0030] Step 3, First-level waste removal The control system precisely controls the timing of actions based on the current linear velocity of the bag on the conveyor path and the physical distance from the detection point to the first-level waste removal station. When a defective bag with printing defects is detected and moves with the first conveyor belt to the material drop gap at the end of the first conveyor belt, the control system triggers the high-speed negative pressure solenoid valve of the corresponding channel to open instantly and conduct negative pressure airflow. This causes the suction hole of the waste removal suction wheel of the bag making machine, located at the diversion position between two adjacent conveyor belts at the end of the first conveyor belt, to generate strong negative pressure. While the waste removal suction wheel of the bag making machine is adsorbing the front end of the bag under negative pressure, it uses its rotation speed, which is higher than that of the conveyor belt, to apply downward pulling and positive centrifugal throwing torque to the defective bag, smoothly throwing it out and removing it into the waste collection area below. Meanwhile, the other bags in the same row that have not been found to have defects smoothly cross the material drop gap and enter the second conveyor belt.

[0031] Step 4, Second-level good product diversion Bags entering the second conveyor belt are continuously flattened, automatically aligned, and conveyed with anti-tilting features under the elastic pressure of the upper paper-pressing circular belt. In multi-column parallel discharge mode (such as one out of two, one out of three, or one out of four), if there are defective products in a certain row of materials in the previous conveyor section and they have been individually removed at the first-level station, the number of bags in each row of that row will be uneven. When the qualified bags in the remaining parallel channels of that row move with the second conveyor belt to the material drop gap at the end of the second conveyor belt, the control system triggers the high-speed negative pressure solenoid valve of the corresponding qualified channel in the second-level waste removal component to open. This causes the waste removal suction wheel of the bag making machine at the end of the second conveyor belt to generate negative pressure adsorption, adsorbing the qualified bags in the remaining parallel channels of that row and throwing them forward to be removed and stored as qualified spare parts in the qualified product collection area. The entire row of materials is emptied at the second-level station and does not enter the subsequent conveyor section.

[0032] Step 5: Synchronize and align the discharge. Rows of fully qualified bags that were not removed by the two-stage waste removal mechanism smoothly transitioned across the second-stage diversion gap to the third conveyor belt, where they continued to be transported to the final discharge port. Because rows of materials containing waste were completely intercepted or diverted, the number of qualified bags remaining on the main conveyor line remained strictly synchronized and consistent, allowing them to smoothly enter the subsequent automated counting, sorting, and packaging stations.

[0033] Differential speed and surface anti-sticking control are implemented during the first-stage waste rejection and second-stage good product sorting steps. The waste-kicking suction wheel shaft is driven to rotate by an independent drive mechanism. The rotation direction of the waste-kicking suction wheel of the bag-making machine is consistent with the running direction of the bag on the first, second, and third conveyor belts. Furthermore, the control system adjusts the outer circumferential linear speed of the waste-kicking suction wheel of the bag-making machine to be greater than the conveying linear speed of the conveyor belt assembly. At the moment of negative pressure conduction, the high-speed rotating suction wheel stretches the bag in the forward direction and guides it downward in an arc shape, avoiding the bag wrinkles, scratches, and tears caused by collisions in traditional push-pull mechanisms. Combined with the Teflon coating on the outer surface of the suction wheel, it effectively prevents thin plastic films or bags with static electricity from adhering to the wheel surface, achieving smooth material removal and falling into the hopper under negative pressure shutdown or micro-positive pressure assisted blowing.

[0034] The multi-mode adaptive switching control system can switch channels according to the production width and cutting mode of the bag making machine: In the single-outlet feeding mode (one out one) working condition, the material occupies only a single channel. The control system only enables the suction wheel and negative pressure air path of the corresponding channel at the end of the first conveyor belt. When a defective product is detected, it is directly removed from the first stage to the defective product collection area. In the second stage good product diversion step, the bag making machine kicking waste suction wheel at the end of the second conveyor belt remains normally closed and does not operate. In the multi-row feeding mode (one out of two, one out of three, or one out of four), all the suction wheels corresponding to the multiple channels enter the controlled standby state. The waste-kicking suction wheel of the bag making machine at the end of the first conveyor belt works in conjunction with the waste-kicking suction wheel of the bag making machine at the end of the second conveyor belt to perform single-row defective bag rejection and divert qualified bags in the same row for storage, ensuring that the count of qualified bags in each row that finally enters the packaging station is completely aligned.

[0035] Example 2 Reference Figures 1 to 4 This invention provides an online detection and defect rejection mechanism for a printing bag making machine. It is located at the rear end of the front-end roll unwinding, correction and flattening, heating and sealing bonding, and fixed-length bag cutting knife of the bag making machine. It is used to accurately identify and intercept printing defects, independently remove defective products through multiple channels, and count and align multiple rows of qualified products under high-speed continuous operation. The mechanism includes: The online inspection system is set on the running path of the roll film and includes an image acquisition unit. It is used to acquire images and identify defects of the high-speed running roll film during the high-speed continuous operation of the bag making machine. When printing defects, color differences or sealing defects are detected in the corresponding bag area on the roll, a waste rejection signal is generated. The encoder is mechanically connected to the transmission mechanism of the bag making machine. It is used to detect and record the conveying distance of the film on the equipment in real time, and to establish a precise time sequence and physical position matching relationship with each individual bag after being cut by the paper cutter, so as to ensure that the waste position signal can be accurately mapped to the corresponding specific bag. The conveyor belt assembly includes a first conveyor belt, a second conveyor belt, and a third conveyor belt arranged sequentially along the material conveying direction. The first conveyor belt is used to dock adjacent to the rear end of the bag cutting knife of the bag making machine and guide the cut and parallel bags into the conveying path. The second conveyor belt is used to smoothly receive the bags conveyed by the first conveyor belt. The third conveyor belt is used to receive the bags conveyed by the second conveyor belt and continue to convey them forward to the end discharge port for subsequent automatic counting, sorting, and packaging. The waste removal mechanism includes two sets of waste removal components respectively located at the ends of the first and second conveyor belts. Each set of waste removal components includes a waste removal suction wheel shaft 6 horizontally mounted on the frame and multiple bag-making machine waste removal suction wheels 3 axially spaced on the waste removal suction wheel shaft 6. The bag-making machine waste removal suction wheels 3 are located at the material distribution gap between two adjacent conveyor belts 7 at the end of the conveyor belt 7, and multiple suction holes are opened circumferentially on their outer circumferential surface. The bag-making machine waste removal suction wheel 3 at the end of the first conveyor belt is used to absorb the corresponding defective bag when a defective product signal is received and throw it out at high speed to the waste collection area. The bag-making machine waste removal suction wheel 3 at the end of the second conveyor belt is used to absorb the corresponding qualified bag in the remaining parallel channels and throw it out at high speed to the qualified product collection area for transfer when there is a defective product in the previous conveying section and it is rejected, so as to ensure that the count of each column of qualified bags remaining on the main conveying channel is completely aligned. The high-speed negative pressure solenoid valve is connected at one end to the negative pressure source of the whole plant through an air pipeline, and at the other end to the air passage inside each suction hole of the waste removal suction wheel 3 of the bag making machine through a pipeline. It is used to instantly conduct negative pressure airflow when receiving the rejection control signal, so that the suction hole generates strong adsorption negative pressure when passing the material contact surface.

[0036] In one implementation, the online inspection system described in this embodiment includes a front inspection camera arranged on the front side of the roll film, a back inspection camera arranged on the back side of the roll film, and an inspection host electrically connected to the front and back inspection cameras. The front and back inspection cameras, in conjunction with a dedicated high-brightness inspection light source, perform double-sided high-frequency image sampling on the roll film continuously traveling at high speed through the inspection area. The inspection host uses an image recognition algorithm to compare the acquired images with a standard template online, extracting printing defects in real time and mapping their coordinates to the corresponding bag-cutting physical unit.

[0037] In one embodiment, a paper-pressing circular belt is provided above the second conveyor belt. The paper-pressing circular belt is arranged in a corresponding manner with the upper bearing surface of the second conveyor belt. It is used to continuously and elastically press down on the high-speed forward bag received from the first conveyor belt, so as to realize the automatic flattening, aligning and anti-tilting stable conveying of the bag during the conveying process, and to avoid displacement or wrinkling of the bag before entering the second-stage waste kicking gap.

[0038] In one implementation, the waste-kicking suction wheel shaft 6 in this embodiment is driven to rotate by an independent drive mechanism (such as an independent servo motor or a variable frequency speed control motor). The rotation direction of the waste-kicking suction wheel 3 of the bag making machine is consistent with the running direction of the bag on the first conveyor belt, the second conveyor belt and the third conveyor belt. The outer circumferential linear speed of the waste-kicking suction wheel 3 of the bag making machine is set to be greater than the conveying linear speed of the conveyor belt assembly. This generates a forward stretching and downward centrifugal throwing torque at the moment of negative pressure adsorption of the bag body, realizing a smooth forward differential speed material removal without scratches or tears.

[0039] In one implementation, the number of waste-kicking suction wheels 3 at the end of the first conveyor belt and the end of the second conveyor belt in this embodiment is four each. They are arranged horizontally side by side at equal intervals along the width of the frame, corresponding to four parallel material conveying channels, so as to accurately adapt to the multi-column parallel discharge working conditions of one-out-one (single channel), one-out-two (double channel), one-out-three (three channel), or one-out-four (four channel) of the finished material bags.

[0040] In one embodiment, the first, second, and third conveyor belts in this example each include a conveyor roller shaft 10 (bag-making machine waste-kicking shaft 10) transversely mounted on a frame bearing seat, and multiple parallel conveyor circular belts 7 (bag-making machine waste-kicking circular belts 7) sleeved on the conveyor roller shaft 10. The multiple conveyor circular belts 7 form flat, multi-row, hollowed-out support planes in each conveying section. The bag-making machine waste-kicking suction wheel 3 is precisely embedded in the gaps between adjacent conveyor circular belts 7 at the ends of each section, ensuring that the highest point of its outer rim is tangent to or slightly lower than the upper bearing surface of the conveyor circular belt 7, thus ensuring that normal material that has not triggered waste kicking can smoothly cross the gaps.

[0041] In one embodiment, each of the bag-making machine's waste-kicking suction wheels 3 is fitted with a bag-making machine waste-kicking suction wheel air-blowing seat 4 and a bag-making machine waste-kicking suction wheel pad 5 made of fabric-reinforced bakelite. The bag-making machine waste-kicking suction wheel air-blowing seat 4 is equipped with an air passage plug 12. The bag-making machine waste-kicking suction wheel air-blowing seat 4 serves as an air distribution seat and is fitted to the side air chamber area of ​​the suction wheel 3. It has an air distribution channel inside that communicates with the suction hole. The air passage plug 12 is used to seal the processing hole or seal the backup air passage and connect to the high-speed negative pressure solenoid valve connector. During the rejection stage, the negative pressure is conducted by the negative pressure solenoid valve to achieve strong adsorption and material throwing. At the moment of material detachment, a micro positive pressure airflow can also be selectively introduced to achieve blowing-assisted material removal, ensuring that waste or good bags smoothly detach from the wheel surface and accurately enter the corresponding hopper. The waste-kicking suction wheel pad 5 of the bag making machine, made of phenolic resin, is fixed between the air blowing seat 4 and the mounting bracket. Utilizing the excellent thermal insulation and structural damping properties of phenolic resin, it effectively absorbs the high-frequency mechanical micro-vibrations caused by the frequent opening and closing of the high-speed solenoid valve and the high-speed rotation of the suction wheel shaft 6, preventing heat conduction and ensuring the air circuit sealing accuracy.

[0042] As one implementation method, the outer surface of the waste-kicking suction wheel 3 of the bag-making machine in this embodiment is covered with a Teflon coating (polytetrafluoroethylene coating). This Teflon coating has an extremely low coefficient of surface friction, which can significantly improve the wear resistance of the wheel surface and effectively prevent the bag from adhering to the wheel surface during high-speed conveying, ensuring that the bag can quickly fall into the corresponding hopper by inertia and gravity after the negative pressure is turned off.

[0043] In one embodiment, a tensioning mechanism is provided below the conveyor belt assembly. The tensioning mechanism includes a fixed shaft 8 for the bag-making machine waste-kick circular belt tensioning block, arranged transversely along the frame; a belt tensioning block 13 slidably mounted on the fixed shaft 8; and a tensioning wheel 9 (bag-making machine waste-kick circular belt tensioning wheel 9) rotatably mounted on the belt tensioning block 13 via the bag-making machine waste-kick circular belt tensioning shaft 15. The tensioning wheel 9 abuts upward against the slack side bottom surface of the corresponding conveyor circular belt 7. By finely adjusting the installation position of the belt tensioning block 13 along the axial and radial directions of the fixed shaft 8, the tension of the corresponding conveyor circular belt 7 in each channel can be adjusted individually, eliminating belt slippage or conveyor deviation caused by inconsistent belt elongation in each channel.

[0044] In one embodiment, the tensioning mechanism further includes a bearing fixing block 14 that is positioned in conjunction with the belt tensioning block 13. The bearing fixing blocks 14, located at both ends of the waste-kicking suction wheel shaft 6 and the end of the conveyor roller shaft 10, are internally fitted with deep groove ball bearings 1 (such as 61800-2LS type deep groove ball bearings) with sealing rings on both sides. These bearings provide stable support for each active high-speed rotating shaft system and prevent workshop paper scraps, film fragments, and dust from entering the bearing interior. The belt tensioning block 13 and each tensioning component are adjustablely locked to the fixed shaft 8 of the waste-kicking belt tensioning block of the bag-making machine via coaxially stacked hexagonal flat head screws 2 and large washers 11. The hexagonal flat head screws 2 pass through the central hole of the large washer 11, and the two are stacked vertically at the shaft end assembly position, with their projections overlapping. Figure 1 As indicated by the shared guide line in markings 2 and 11, this screw-washer combination provides a reliable lock with high preload, preventing loosening under high-speed continuous vibration.

[0045] The specific work process is as follows: The pre-printed roll material is corrected, tension controlled, and sealed and pressurized into a bag tube before entering the cutting station; the online detection system collects images and triggers a waste signal when printing defects are detected; the encoder detects the film conveying distance in real time and establishes a precise position match with the position of the bag after being cut by the cutter; the finished bag after cutting falls into the first conveyor belt and is smoothly conveyed forward.

[0046] When the detected defective bag reaches the end of the first conveyor belt, the high-speed negative pressure solenoid valve of the corresponding channel in the first-stage waste kicking component opens, and the corresponding bag making machine waste kicking suction wheel 3 generates negative pressure, adsorbing the defective bag and using a linear speed higher than that of the conveyor belt to throw it into the waste collection area at high speed; the other defect-free bags in the same row smoothly cross the material drop gap and enter the second conveyor belt, and are flattened and conveyed forward under the action of the paper pressing round belt.

[0047] In a multi-column parallel operation, if a row of bags in a certain material is deemed defective and rejected at the end of the first conveyor belt, when that row reaches the end of the second conveyor belt, the second-stage rejection component controls the adsorption of the corresponding qualified bags in the remaining parallel channels and throws them all into the qualified product collection area for later storage. Since the defective channel in that row has already been emptied in the previous stage, the remaining qualified channel material is diverted and stored in the second stage, ensuring that that row is completely empty when it enters the third conveyor belt. The subsequent rows of fully qualified material then pass completely through the second-stage rejection station into the third conveyor belt, ensuring that the number of qualified bags in each column delivered to the discharge port remains strictly synchronized and completely eliminating the problem of multi-column counting imbalance. The fully aligned qualified bags, without the two-stage rejection adsorption, smoothly transition to the third conveyor belt and are delivered to the discharge port, successfully entering the downstream automated counting, sorting, and packaging station for packaging and warehousing.

[0048] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A method for online detection and rejecting of defective products in a printing bag making machine, characterized in that, Includes the following steps: Online detection and position matching: During the operation of the roll film, the online detection system collects the printed image of the roll and generates a reject signal when a printing defect is detected in the corresponding bag area on the roll; the encoder connected to the bag making machine transmission mechanism detects the film conveying distance and performs position matching with the bags cut by the paper cutter. Multi-channel inlet conveyor: The cut parallel bags are introduced by the first conveyor belt. The first, second and third conveyor belts each include multiple parallel conveyor belts and form multiple conveyor channels corresponding to the number of discharge columns. The bags are conveyed forward by the second and third conveyor belts in sequence along the material conveying direction. First-level waste removal: When a defective bag is detected to be running to the end of the first conveyor belt, the high-speed negative pressure solenoid valve of the corresponding channel is controlled to conduct negative pressure airflow, so that the waste suction wheel of the bag making machine located at the diversion position between two adjacent conveyor belts at the end of the first conveyor belt generates negative pressure adsorption, adsorbs the defective bag and throws it out to the waste collection area; the remaining bags in the same row that are not removed enter the second conveyor belt; Second-level good product diversion: In the case of multiple parallel discharge, if there are defective products in the previous conveyor section and they are rejected, when the qualified bags in the other parallel channels of the row run to the end of the second conveyor belt, the high-speed negative pressure solenoid valve of the corresponding channel is controlled to conduct negative pressure airflow, so that the waste suction wheel of the bag making machine at the end of the second conveyor belt generates negative pressure adsorption, adsorbs and throws out the qualified bags in the other parallel channels of the row, and diverts them to the qualified product collection area for storage; Synchronous alignment and discharge: The entire row of qualified bags that have not been rejected by the two stages are conveyed to the discharge port by the third conveyor belt and enter the subsequent automated counting, sorting and packaging station.

2. The online detection and waste rejection method for a printing bag making machine according to claim 1, characterized in that: In the first-stage waste rejection and second-stage good product sorting steps, the waste-kicking suction wheel of the bag-making machine is driven by an independent drive mechanism and rotates in the same direction as the bags running on each conveyor belt, controlling the outer circumferential linear speed of the waste-kicking suction wheel of the bag-making machine to be greater than the linear speed of the conveyor belt assembly.

3. The online detection and waste rejection method for a printing bag making machine according to claim 1, characterized in that: In the single-row feeding mode (one out of one), the waste-kicking suction wheel of the bag-making machine at the end of the second conveyor belt remains idle and does not operate in the second-level good product diversion step; in the multi-row feeding mode (one out of two, one out of three or one out of four), the waste-kicking suction wheel of the bag-making machine at the end of the first conveyor belt and the waste-kicking suction wheel of the bag-making machine at the end of the second conveyor belt work together to perform waste rejection and diversion of good products in the same row.

4. An online detection and rejecting device for implementing the method according to any one of claims 1 to 3, characterized in that, include: The online inspection system is set on the running path of the roll film, including an image acquisition unit, which is used to acquire the printed image of the roll and generate a waste rejection signal when a printing defect is detected in the corresponding bag area on the roll. The encoder, connected to the transmission mechanism of the bag making machine, is used to detect the film conveying distance and match the position of the bag after it has been cut by the paper cutter. The conveyor belt assembly includes a first conveyor belt, a second conveyor belt, and a third conveyor belt arranged sequentially. Each of the first, second, and third conveyor belts includes multiple parallel conveyor belts. The first conveyor belt is used to connect to the rear end of the bag cutter of the bag making machine and to guide parallel bags in. The second conveyor belt is used to receive the bags conveyed by the first conveyor belt. The third conveyor belt is used to receive the bags conveyed by the second conveyor belt and continue to convey them forward to the discharge port. The waste removal mechanism includes two sets of waste removal components respectively disposed at the ends of the first conveyor belt and the second conveyor belt. Each set of waste removal components includes a transversely arranged waste removal suction wheel shaft and multiple bag-making machine waste removal suction wheels mounted on the waste removal suction wheel shaft. The bag-making machine waste removal suction wheels are located at the diversion position between two adjacent conveyor belts at the end of the conveyor belt, and have multiple suction holes along the circumferential direction on their outer circumferential surface. The bag-making machine waste removal suction wheel at the end of the first conveyor belt is used to absorb and throw out the defective bag when a defective bag is detected, and reject it to the waste collection area. The bag-making machine waste removal suction wheel at the end of the second conveyor belt is used to absorb and throw out the corresponding qualified bag in the remaining parallel channels of the row when a defective product exists in the previous conveying section and is rejected, and divert it to the qualified product collection area. Multiple high-speed negative pressure solenoid valves are provided. One end of each high-speed negative pressure solenoid valve is connected to a negative pressure source through a pipeline, and the other end is connected to the suction holes of the corresponding waste-removing suction wheel of the bag making machine through a pipeline. The valves are used to conduct negative pressure airflow when a rejection control signal is received, so that the corresponding suction holes generate negative pressure adsorption.

5. The online detection and waste rejection device for a printing bag making machine according to claim 4, characterized in that: The online inspection system includes a front inspection camera arranged on the front side of the roll film, a back inspection camera arranged on the back side of the roll film, and an inspection host electrically connected to the front inspection camera and the back inspection camera.

6. The online detection and waste rejection device for a printing bag making machine according to claim 4, characterized in that: Above the second conveyor belt is a paper-pressing circular belt, which is used to automatically align and press the bags during transport.

7. The online detection and waste rejection device for a printing bag making machine according to claim 4, characterized in that: The waste-kicking suction wheel shaft is driven by an independent drive mechanism. The rotation direction of the waste-kicking suction wheel of the bag-making machine is the same as the running direction of the bag on the first conveyor belt, the second conveyor belt and the third conveyor belt, and the outer circumferential linear velocity of the waste-kicking suction wheel of the bag-making machine is greater than the linear velocity of the conveyor belt assembly.

8. The online detection and waste rejection device for a printing bag making machine according to claim 4, characterized in that: The number of waste-kicking suction wheels of the bag-making machine at the end of the first conveyor belt and the end of the second conveyor belt is four each, arranged side by side along the width direction to correspond to the channel layout of one out of one, one out of two, one out of three or one out of four for the finished bags of materials.

9. The online detection and waste rejection device for a printing bag making machine according to claim 4, characterized in that: The first conveyor belt, the second conveyor belt, and the third conveyor belt each include a transversely arranged conveyor roller shaft and multiple parallel conveyor circular belts sleeved on the conveyor roller shaft.

10. The online detection and waste rejection device for a printing bag making machine according to claim 9, characterized in that: Each of the bag making machine's waste-kicking suction wheel is equipped with a bag making machine waste-kicking suction wheel air-blowing seat and a bag making machine waste-kicking suction wheel pad made of fabric-reinforced bakelite. The bag making machine waste-kicking suction wheel air-blowing seat is equipped with an air passage plug.

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