Printing machine paper feeding control method and system and storage medium

Abstract

The invention relates to the field of printing machine control, and discloses a printing machine paper feeding control method and system and a storage medium, and the method comprises the following steps: carrying out flatness abnormity traceability and flatness control processing of printing paper in a printing machine so as to obtain a printing machine with qualified paper feeding flatness; and in the paper feeding flatness qualified printing machine, flatness abnormity real-time monitoring is carried out on the target printing paper based on a photoelectric detection head, an alarm signal is generated, and finally in combination with a high-speed counter, paper locking processing is carried out on the target printing paper in the paper feeding flatness qualified printing machine. The flatness of the target printing paper can be controlled, the printing quality is guaranteed, the production efficiency is improved, and waste is reduced.

Description

Technical Field

[0001] The present invention relates to the field of printing press control, and in particular to a printing press paper feeding control method, system and storage medium. Background Art

[0002] The main purpose of paper feeding in a printing press is to transfer paper from the input end to the output end, ensuring that the paper can move along the predetermined path and speed so that the printing press can print the required text or image on the paper. During the paper feeding process of the printing press, problems such as paper jams, inconsistent front and back positions, left and right deviations, and uneven paper feeding are prone to occur, affecting the printing quality. In order to ensure printing quality and efficiency, paper feeding control is very necessary. By accurately controlling the paper feeding speed and position, it can ensure that the printing press prints clear and accurate text or images on the paper, improve production efficiency, reduce waste, and adapt to the needs of different paper types. Summary of the invention

[0003] The present invention overcomes the shortcomings of the prior art and provides a printing press paper feeding control method, system and storage medium.

[0004] In order to achieve the above object, the technical solution adopted by the present invention is: A first aspect of the present invention provides a method for controlling paper feeding of a printing press, comprising the following steps: Perform real-time flatness detection of printed paper in the printing press. If there is any abnormal flatness of the printed paper, trace the abnormal flatness of the printed paper and perform flatness control in the printing press; In a paper-feeding flat-grid printing machine, a photoelectric detection head is used to monitor the flatness abnormality of a target printing paper in real time, and an alarm signal is generated in the paper-feeding flat-grid printing machine based on the monitoring result; Based on the alarm signal, combined with the high-speed counter, the target printing paper is locked in the paper feeding and integration printing machine.

[0005] Furthermore, in a preferred embodiment of the present invention, the flatness of the printing paper is detected in real time in the printing press. If there is an abnormal flatness of the printing paper, the abnormal flatness of the printing paper is traced and the flatness control process is performed in the printing press, specifically: The printing press that performs paper feeding control is calibrated as the target printing press, and the specification data of the target printing press is obtained, wherein the specification size of the target printing press describes the size of all printing papers that can be put into the target printing press, which is calibrated as the size of printing papers that can be put in, and also describes the maximum number of printing papers that can be put in, which is calibrated as the maximum number of printing papers that can be put in; Prepare printing paper with a size equal to the size of printing paper that can be inserted, mark it as target printing paper, and insert the target printing paper in a quantity equal to the maximum printing paper insertion quantity into the target printing press; In the target printing press, the position where the target printing paper is transported and fed is calibrated as the printing paper feeding position, and a laser displacement sensor is installed at the printing press feeding position, wherein the laser displacement sensor can measure the real-time paper height of the target printing paper; Wherein, the paper feeding position of the printing press includes a transmission gear and a paper feeding board; A target printing paper quantity-paper height comparison map is preset, and the target printing paper quantity is monitored in real time within the paper feeding position of the printing press, and is calibrated as the target printing paper real-time quantity, and based on the target printing paper quantity-paper height comparison map and the target printing paper real-time quantity, a standard paper height of the target printing paper is generated; Based on the laser displacement sensor, the real-time paper height of the target printing paper is measured. If the real-time paper height of the target printing paper is not equal to the standard paper height, the target printing paper is flattened at the paper feeding position of the printing press. If the real-time paper height of the target printing paper is equal to the standard paper height after the flattening process, the target printing press is calibrated as a flat-feeding grid printing press. If the real-time paper height of the target printing paper after the flattening process is still not equal to the standard paper height, the flatness anomaly tracing and flatness control process are performed on the printing paper in the target printing press.

[0006] Furthermore, in a preferred embodiment of the present invention, the flatness abnormality tracing and flatness control processing of the printing paper in the target printing press is specifically as follows: In a target printing machine, a target printing paper sample is extracted, and the moisture content of the target printing paper sample is measured to obtain the real-time moisture content of the target printing paper sample, and a standard moisture content range of the target printing paper is preset; If the real-time moisture content of the target printing paper sample is not maintained within the standard moisture content range, an environmental humidification device is connected to the target printing machine, and a comparison table of air humidity and moisture content of the target printing paper is obtained; Based on the comparison table of air humidity and moisture content of target printing paper, combined with the standard moisture content range of target printing paper, the target air humidity is generated, and the environmental humidification equipment is controlled to adjust the air humidity to the target humidity in the target printing machine, so that the real-time moisture content of the target printing paper is maintained within the standard moisture content range; If the real-time moisture content of the target printing paper sample is maintained within the standard moisture content range, but the real-time paper height of the target printing paper is still not equal to the standard paper height, a real-time image of the paper feeding position of the printing press is obtained through an image acquisition device; The Canny edge detection operator is introduced to calculate the edge gradient of the printing press paper feed position in the real-time image of the printing press paper feed position, and the edge feature of the printing press paper feed position is obtained based on the edge gradient of the printing press paper feed position; The SIFT algorithm is introduced to perform scale convolution on the edge features at the paper feeding position of the printing press, and the scale-invariant feature points are extracted for feature smoothing construction to obtain the real-time smooth edge features at the paper feeding position of the printing press. Presetting the standard edge feature of the paper feeding position of the printing press, and calculating the overlap rate between the standard edge feature of the paper feeding position of the printing press and the real-time smooth edge feature, and calibrating it as the edge feature overlap rate; If the edge feature overlap rate is less than a preset value, it is proved that the target printing paper at the paper feeding position of the printing press is offset, and a first abnormal factor is recorded in the target printing press, wherein the first abnormal factor is that the target printing paper at the paper feeding position of the printing press is offset; If the edge feature overlap rate is not less than a preset value, a second abnormal factor is recorded in the target printing press, wherein the second abnormal factor is a defect at the paper feeding position of the printing press; Based on the first abnormality factor and the second abnormality factor, flatness control of the target printing paper is performed in the target printing press.

[0007] Further, in a preferred embodiment of the present invention, the flatness control of the target printing paper is performed in the target printing press based on the first abnormal factor and the second abnormal factor, specifically as follows: If the first abnormal factor is recorded in the target printing press, the transmission gear and the paper feeder board at the paper feeding position of the printing press are tightened, and the edge feature overlap rate is determined after the transmission gear and the paper feeder board are tightened to see whether it is still less than the preset value; If yes, a supporting paperboard is installed on the feeding paperboard, wherein the supporting paperboard is a paperboard for adjusting the position of the target printing paper, and can offset and adjust the target printing paper so that the edge feature overlap rate is not less than a preset value, and the real-time paper height of the target printing paper is equal to the standard paper height; If the second abnormal factor is recorded in the target printing press, the rotation speed of the rotating gear in the paper feeding position of the printing press is obtained, and the rotation speed of the rotating gear is adjusted to determine whether there is a rotation speed of the rotating gear that makes the real-time paper height of the target printing paper equal to the standard paper height; If yes, the speed of the corresponding rotating gear is calibrated as the target speed, and the speed of the rotating gear is controlled to be equal to the target speed, so as to achieve the flatness correction of the target printing paper; If not, replace the paper feeder board and tighten it after replacement. If the real-time paper height of the target printing paper is still not equal to the standard paper height after replacing the paper feeder board, install and run the paper blowing fan at the paper feeding position of the printing press to make the real-time paper height of the target printing paper equal to the standard paper height.

[0008] Furthermore, in a preferred embodiment of the present invention, in the paper feeding and leveling printing machine, the flatness abnormality of the target printing paper is monitored in real time by a photoelectric detection head, and an alarm signal is generated in the paper feeding and leveling printing machine based on the monitoring result, specifically: A photoelectric detection head is obtained in a paper-feeding flat-bed printer, and during the paper feeding process of the paper-feeding flat-bed printer, the paper information of the target printing paper is converted into an electrical signal by the photoelectric detection head in real time in combination with the photoelectric effect, and the electrical signal is calibrated as the target printing paper electrical signal, and uploaded to the paper-feeding flat-bed printer for storage; The target printing paper electrical signal records the real-time flatness of the target printing paper, and the real-time flatness of the target printing paper is obtained from the real-time paper height of the target printing paper; In a paper feeding and flat-grid printing machine, the target printing paper electrical signal is subjected to signal adaptive filtering, and the target printing paper electrical signal is subjected to recursive filtering in combination with the minimum mean square error criterion to obtain the target printing paper filtered electrical signal; If the real-time flatness of the target printing paper recorded in the target printing paper filter electrical signal is not maintained within a preset range, an alarm signal is generated in the paper leveling printing press, wherein the alarm signal is used to remind the paper leveling printing press that the real-time paper height of the target printing paper is not equal to the standard paper height.

[0009] Furthermore, in a preferred embodiment of the present invention, the target printing paper is locked in the paper feeding and leveling printing press based on the alarm signal and combined with a high-speed counter, specifically: In a paper feeding and leveling printing press, a high-speed counter is obtained, wherein the high-speed counter is a counter for recording the number of target printing papers conveyed in real time; The maximum paper feed value is preset, the high-speed counter is initialized, and the high-speed counter is configured, wherein the high-speed counter is configured such that when an alarm signal is generated in the paper feed level integration grid printing machine or the paper feed amount of the paper feed level integration grid printing machine reaches the maximum paper feed value, the high-speed counter outputs the current paper feed amount in real time, and outputs an interrupt instruction in the high-speed counter, wherein the interrupt instruction is for the terminal paper feed level integration grid printing machine to feed paper and realize paper locking; The configured high-speed counter is started, and if the configured high-speed counter does not output an interrupt instruction in the paper feeding level integration printing machine when an alarm signal is generated in the paper feeding level integration printing machine, or when the paper feeding number of the paper feeding level integration printing machine reaches the maximum paper feeding value, the configured high-speed counter also does not output an interrupt instruction in the paper feeding level integration printing machine, then the configured high-speed counter is marked as an abnormally configured high-speed counter; The current working parameters of the abnormally configured high-speed counter are obtained, and the Bayesian network algorithm is introduced to trace the defects of the current working parameters of the abnormally configured high-speed counter, and the defect location of the abnormally configured high-speed counter is determined. At the same time, the maintenance plan of the defect location of the abnormally configured high-speed counter is retrieved and output in the big data network to obtain a qualified high-speed counter; When the qualified high-speed counter outputs an interrupt instruction, the paper feed leveling and grid printing press is controlled to control the flatness of the target printing paper.

[0010] The second aspect of the present invention further provides a printing press paper feed control system, the printing press paper feed control system comprises a memory and a processor, the memory stores a printing press paper feed control method, and when the printing press paper feed control method is executed by the processor, the following steps are implemented: Perform real-time flatness detection of printed paper in the printing press. If there is any abnormal flatness of the printed paper, trace the abnormal flatness of the printed paper and perform flatness control in the printing press; In a paper-feeding flat-grid printing machine, a photoelectric detection head is used to monitor the flatness abnormality of a target printing paper in real time, and an alarm signal is generated in the paper-feeding flat-grid printing machine based on the monitoring result; Based on the alarm signal, combined with the high-speed counter, the target printing paper is locked in the paper feeding and integration printing machine.

[0011] The present invention solves the technical defects existing in the background technology, and has the following beneficial effects: the flatness abnormality of the printing paper is traced and the flatness control process is performed in the printing press, so as to obtain the paper feeding flat grid printing press, and the flatness abnormality of the target printing paper is monitored in real time based on the photoelectric detection head in the paper feeding flat grid printing press, an alarm signal is generated, and finally, in combination with the high-speed counter, the target printing paper is locked in the paper feeding flat grid printing press. The present invention can realize the flatness control process of the target printing paper, ensure the printing quality, improve the production efficiency, and reduce the waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, drawings of other embodiments can be obtained based on these drawings without paying creative work.

[0013] Figure 1 A flow chart of a method for controlling paper feeding of a printing press is shown; Figure 2 A flow chart of a method for tracing the source of abnormal flatness of printed paper and controlling flatness in a printing press is shown; Figure 3 A program view of a paper feed control system of a printing press is shown. DETAILED DESCRIPTION

[0014] In order to more clearly understand the above-mentioned purpose, features and advantages of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0015] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0016] Figure 1 A flow chart of a printing press paper feeding control method is shown, comprising the following steps: S102: Performing real-time flatness detection of printed paper in the printing press, and if there is abnormal flatness of the printed paper, tracing the abnormal flatness of the printed paper and performing flatness control processing in the printing press; S104: In the paper feeding flatness integration printing machine, the flatness abnormality of the target printing paper is monitored in real time by a photoelectric detection head, and an alarm signal is generated in the paper feeding flatness integration printing machine based on the monitoring result; S106: Based on the alarm signal and in combination with the high-speed counter, the target printing paper is locked in the paper feeding and leveling printing press.

[0017] Furthermore, in a preferred embodiment of the present invention, in the paper feeding and leveling printing machine, the flatness abnormality of the target printing paper is monitored in real time by a photoelectric detection head, and an alarm signal is generated in the paper feeding and leveling printing machine based on the monitoring result, specifically: A photoelectric detection head is obtained in a paper-feeding flat-bed printer, and during the paper feeding process of the paper-feeding flat-bed printer, the paper information of the target printing paper is converted into an electrical signal by the photoelectric detection head in real time in combination with the photoelectric effect, and the electrical signal is calibrated as the target printing paper electrical signal, and uploaded to the paper-feeding flat-bed printer for storage; The target printing paper electrical signal records the real-time flatness of the target printing paper, and the real-time flatness of the target printing paper is obtained from the real-time paper height of the target printing paper; In a paper feeding and flat-grid printing machine, the target printing paper electrical signal is subjected to signal adaptive filtering, and the target printing paper electrical signal is subjected to recursive filtering in combination with the minimum mean square error criterion to obtain the target printing paper filtered electrical signal; If the real-time flatness of the target printing paper recorded in the target printing paper filter electrical signal is not maintained within a preset range, an alarm signal is generated in the paper leveling printing press, wherein the alarm signal is used to remind the paper leveling printing press that the real-time paper height of the target printing paper is not equal to the standard paper height.

[0018] It should be noted that photoelectric detection heads are installed on both sides of the printing press, which can detect the entry of paper and transmit the paper information to the monitoring system of the printing press in the form of signals. In this way, the printing press can monitor the entry of paper in real time to ensure that the paper enters the printing process correctly. In the target printing press, the photoelectric detection head can analyze and record the flatness of the target printing paper. If the target printing paper has an abnormal flatness, an alarm signal is generated to remind the equipment that further processing is required, such as adjusting the flatness of the printing paper. Because when the printing press is a paper feeding flat grid printing press, if the flatness of the printing paper is abnormal, the real-time printing press can also perform flatness control. The purpose of signal adaptive filtering and recursive filtering of the target printing paper electrical signal is to make the information carried in the signal more accurate, prevent errors, generate false alarm signals, and cause printing to stop, reducing printing efficiency.

[0019] Furthermore, in a preferred embodiment of the present invention, the target printing paper is locked in the paper feeding and leveling printing press based on the alarm signal and combined with a high-speed counter, specifically: In a paper feeding and leveling printing press, a high-speed counter is obtained, wherein the high-speed counter is a counter for recording the number of target printing papers conveyed in real time; The maximum paper feed value is preset, the high-speed counter is initialized, and the high-speed counter is configured, wherein the high-speed counter is configured such that when an alarm signal is generated in the paper feed level integration grid printing machine or the paper feed amount of the paper feed level integration grid printing machine reaches the maximum paper feed value, the high-speed counter outputs the current paper feed amount in real time, and outputs an interrupt instruction in the high-speed counter, wherein the interrupt instruction is for the terminal paper feed level integration grid printing machine to feed paper and realize paper locking; The configured high-speed counter is started, and if the configured high-speed counter does not output an interrupt instruction in the paper feeding level integration printing machine when an alarm signal is generated in the paper feeding level integration printing machine, or when the paper feeding number of the paper feeding level integration printing machine reaches the maximum paper feeding value, the configured high-speed counter also does not output an interrupt instruction in the paper feeding level integration printing machine, then the configured high-speed counter is marked as an abnormally configured high-speed counter; The current working parameters of the abnormally configured high-speed counter are obtained, and the Bayesian network algorithm is introduced to trace the defects of the current working parameters of the abnormally configured high-speed counter, and the defect location of the abnormally configured high-speed counter is determined. At the same time, the maintenance plan of the defect location of the abnormally configured high-speed counter is retrieved and output in the big data network to obtain a qualified high-speed counter; When the qualified high-speed counter outputs an interrupt instruction, the paper feed leveling and grid printing press is controlled to control the flatness of the target printing paper.

[0020] It should be noted that during the high-speed operation of the printing press, there may be problems with the electromagnet action time and the switch laser head response time lag, resulting in the inability to lock the paper. In order to solve this problem, a high-speed counter can be set in the printing press, and an interrupt instruction can be programmed into the control program to achieve the purpose of interrupting the paper feed of the printing press for a specific purpose. During the paper feeding process, if the paper flatness is abnormal or the paper feed quantity reaches the preset threshold, the paper feed cannot continue. The high-speed counter is required to achieve the purpose of locking the paper, so it is necessary to configure the high-speed counter so that the high-speed counter meets the above requirements. When the configured high-speed counter fails to meet the above requirements, it proves that there is a problem inside the high-speed counter, and the internal defects of the high-speed counter need to be corrected. When the qualified high-speed counter outputs an interrupt instruction, the paper feed is controlled to level the qualified printing press to control the flatness of the target printing paper.

[0021] Figure 2 The present invention shows a flow chart of a method for tracing the source of abnormal flatness of printed paper and controlling the flatness in a printing press, including the following steps: S202: Performing real-time flatness detection of printed paper in the printing press, and if there is abnormal flatness of the printed paper, tracing the abnormal flatness of the printed paper and performing flatness control processing in the printing press; S204: performing flatness abnormality tracing and flatness control processing on the printing paper in the target printing press; S206: Based on the first abnormal factor and the second abnormal factor, the flatness of the target printing paper is controlled in the target printing press.

[0022] Furthermore, in a preferred embodiment of the present invention, the flatness of the printing paper is detected in real time in the printing press. If there is an abnormal flatness of the printing paper, the abnormal flatness of the printing paper is traced and the flatness control process is performed in the printing press, specifically: The printing press that performs paper feeding control is calibrated as the target printing press, and the specification data of the target printing press is obtained, wherein the specification size of the target printing press describes the size of all printing papers that can be put into the target printing press, which is calibrated as the size of printing papers that can be put in, and also describes the maximum number of printing papers that can be put in, which is calibrated as the maximum number of printing papers that can be put in; Prepare printing paper with a size equal to the size of printing paper that can be inserted, mark it as target printing paper, and insert the target printing paper in a quantity equal to the maximum printing paper insertion quantity into the target printing press; In the target printing press, the position where the target printing paper is transported and fed is calibrated as the printing paper feeding position, and a laser displacement sensor is installed at the printing press feeding position, wherein the laser displacement sensor can measure the real-time paper height of the target printing paper; Wherein, the paper feeding position of the printing press includes a transmission gear and a paper feeding board; A target printing paper quantity-paper height comparison map is preset, and the target printing paper quantity is monitored in real time within the paper feeding position of the printing press, and is calibrated as the target printing paper real-time quantity, and based on the target printing paper quantity-paper height comparison map and the target printing paper real-time quantity, a standard paper height of the target printing paper is generated; Based on the laser displacement sensor, the real-time paper height of the target printing paper is measured. If the real-time paper height of the target printing paper is not equal to the standard paper height, the target printing paper is flattened at the paper feeding position of the printing press. If the real-time paper height of the target printing paper is equal to the standard paper height after the flattening process, the target printing press is calibrated as a flat-feeding grid printing press. If the real-time paper height of the target printing paper after the flattening process is still not equal to the standard paper height, the flatness anomaly tracing and flatness control process are performed on the printing paper in the target printing press.

[0023] It should be noted that the target printing paper can be placed in the target printing machine for paper feeding and printing. Before placing the paper, the size of the paper needs to be analyzed to determine all the sizes that can be placed. The laser displacement sensor can measure the real-time paper height of the target printing paper. After obtaining the real-time paper height, because the thickness of the printing paper is constant, the more the number, the higher the paper height, and the number is proportional to the paper height and has a corresponding relationship. If the comparison relationship between the current number and the real-time paper height is inconsistent, it proves that there is uneven paper in the printing machine. Uneven paper includes paper protrusions, paper skew, and paper feeding errors. If there is uneven paper, it is easy to reduce printing efficiency, or the printing position will deviate and produce misprints, so it is necessary to flatten the printing paper to maintain its real-time paper height equal to the standard paper height. If the real-time paper height is still not equal to the standard paper height after flattening, it is necessary to trace the flatness anomaly and control the flatness.

[0024] Furthermore, in a preferred embodiment of the present invention, the flatness abnormality tracing and flatness control processing of the printing paper in the target printing press is specifically as follows: In a target printing machine, a target printing paper sample is extracted, and the moisture content of the target printing paper sample is measured to obtain the real-time moisture content of the target printing paper sample, and a standard moisture content range of the target printing paper is preset; If the real-time moisture content of the target printing paper sample is not maintained within the standard moisture content range, an environmental humidification device is connected to the target printing machine, and a comparison table of air humidity and moisture content of the target printing paper is obtained; Based on the comparison table of air humidity and moisture content of target printing paper, combined with the standard moisture content range of target printing paper, the target air humidity is generated, and the environmental humidification equipment is controlled to adjust the air humidity to the target humidity in the target printing machine, so that the real-time moisture content of the target printing paper is maintained within the standard moisture content range; If the real-time moisture content of the target printing paper sample is maintained within the standard moisture content range, but the real-time paper height of the target printing paper is still not equal to the standard paper height, a real-time image of the paper feeding position of the printing press is obtained through an image acquisition device; The Canny edge detection operator is introduced to calculate the edge gradient of the printing press paper feed position in the real-time image of the printing press paper feed position, and the edge feature of the printing press paper feed position is obtained based on the edge gradient of the printing press paper feed position; The SIFT algorithm is introduced to perform scale convolution on the edge features at the paper feeding position of the printing press, and the scale-invariant feature points are extracted for feature smoothing construction to obtain the real-time smooth edge features at the paper feeding position of the printing press. Presetting the standard edge feature of the paper feeding position of the printing press, and calculating the overlap rate between the standard edge feature of the paper feeding position of the printing press and the real-time smooth edge feature, and calibrating it as the edge feature overlap rate; If the edge feature overlap rate is less than a preset value, it is proved that the target printing paper at the paper feeding position of the printing press is offset, and a first abnormal factor is recorded in the target printing press, wherein the first abnormal factor is that the target printing paper at the paper feeding position of the printing press is offset; If the edge feature overlap rate is not less than a preset value, a second abnormal factor is recorded in the target printing press, wherein the second abnormal factor is a defect at the paper feeding position of the printing press; Based on the first abnormality factor and the second abnormality factor, flatness control of the target printing paper is performed in the target printing press.

[0025] It should be noted that the purpose of extracting printing paper samples is to measure the moisture content of printing paper, because the fiber structure of paper is hygroscopic and its moisture content is easily changed with the change of environmental humidity, thereby affecting the flatness. If the real-time moisture content of the target printing paper sample is not maintained within the standard moisture content range, it is necessary to adjust the moisture content through a humidifying device. The humidifying device is in the printing press to adjust the air humidity. For example, if it is too dry, humidification treatment is required. Combined with the standard moisture content range of the target printing paper, the output parameters of the humidifying device corresponding to different moisture contents are different. If the real-time moisture content of the target printing paper sample is maintained within the standard moisture content range, but the real-time paper height of the target printing paper is still not equal to the standard paper height, it is judged that the printing paper may be offset, etc., resulting in abnormal height. To determine whether it is offset, an image detection algorithm can be used to perform feature overlap calculation. Because the printing paper placed in the printing press should have an overlap rate of 100%, if the overlap rate is not 100%, it proves that an offset occurs during placement. Through the image method, the edge features of the paper feeding position of the printing press are obtained, which describes the edge features of the paper. When calculating the overlap rate of the edge features and the standard value, if the edge feature overlap rate is less than the preset value, it proves that the target printing paper at the paper feeding position of the printing press is offset; if the edge feature overlap rate is not less than the preset value, it proves that there are other aspects that cause the height abnormality. The Canny edge detection operator is an algorithm for calculating the edge gradient of objects in the image, and the SIFT algorithm is a feature smoothing algorithm. Combined with the edge overlap rate, the first abnormal factor and the second abnormal factor can be obtained. The first abnormal factor and the second abnormal factor can exist at the same time.

[0026] Further, in a preferred embodiment of the present invention, the flatness control of the target printing paper is performed in the target printing press based on the first abnormal factor and the second abnormal factor, specifically as follows: If the first abnormal factor is recorded in the target printing press, the transmission gear and the paper feeder board at the paper feeding position of the printing press are tightened, and the edge feature overlap rate is determined after the transmission gear and the paper feeder board are tightened to see whether it is still less than the preset value; If yes, a supporting paperboard is installed on the feeding paperboard, wherein the supporting paperboard is a paperboard for adjusting the position of the target printing paper, and can offset and adjust the target printing paper so that the edge feature overlap rate is not less than a preset value, and the real-time paper height of the target printing paper is equal to the standard paper height; If the second abnormal factor is recorded in the target printing press, the rotation speed of the rotating gear in the paper feeding position of the printing press is obtained, and the rotation speed of the rotating gear is adjusted to determine whether there is a rotation speed of the rotating gear that makes the real-time paper height of the target printing paper equal to the standard paper height; If yes, the speed of the corresponding rotating gear is calibrated as the target speed, and the speed of the rotating gear is controlled to be equal to the target speed, so as to achieve the flatness correction of the target printing paper; If not, replace the paper feeder board and tighten it after replacement. If the real-time paper height of the target printing paper is still not equal to the standard paper height after replacing the paper feeder board, install and run the paper blowing fan at the paper feeding position of the printing press to make the real-time paper height of the target printing paper equal to the standard paper height.

[0027] It should be noted that if the first abnormal factor exists, it proves that the paper has shifted and needs to be corrected. The paper may have a high overlap rate when it is put in. It may be caused by the tilt, looseness, severe wear of the paper feeding board at the paper feeding position or the excessive speed of the gear during the paper feeding process. Therefore, the transmission gear and the paper feeding board should be tightened first, and the gear speed should be adjusted so that it will not shift due to friction during the paper feeding process. At the same time, a support board can be installed on the paper feeding board to prevent the paper from shifting and to fix the paper. If the second abnormal factor exists, it proves that there are other aspects that cause height abnormalities. Continue to adjust the gear running speed and use the paper blowing fan to keep the paper height constant. The paper blowing fan blows air on the surface of the paper and presses the paper by air pressure to achieve height regulation.

[0028] like Figure 3 As shown, the second aspect of the present invention further provides a printing press paper feed control system, the printing press paper feed control system includes a memory and a processor, the memory stores a printing press paper feed control method, and when the printing press paper feed control method is executed by the processor, the following steps are implemented: Perform real-time flatness detection of printed paper in the printing press. If there is any abnormal flatness of the printed paper, trace the abnormal flatness of the printed paper and perform flatness control in the printing press; In a paper-feeding flat-grid printing machine, a photoelectric detection head is used to monitor the flatness abnormality of a target printing paper in real time, and an alarm signal is generated in the paper-feeding flat-grid printing machine based on the monitoring result; Based on the alarm signal, combined with the high-speed counter, the target printing paper is locked in the paper feeding and integration printing machine.

[0029] In the several embodiments provided in the present application, it should be understood that the disclosed devices and methods can be implemented in other ways. The device embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation, such as: multiple units or components can be combined, or can be integrated into another system, or some features can be ignored or not executed. In addition, the coupling, direct coupling, or communication connection between the components shown or discussed can be through some interfaces, and the indirect coupling or communication connection of the devices or units can be electrical, mechanical or other forms.

[0030] The units described above as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units; they may be located in one place or distributed on multiple network units; some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment.

[0031] In addition, all functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may be separately used as a unit, or two or more units may be integrated into one unit; the above-mentioned integrated units may be implemented in the form of hardware or in the form of hardware plus software functional units.

[0032] A person of ordinary skill in the art can understand that: all or part of the steps of implementing the above method embodiment can be completed by hardware related to program instructions, and the aforementioned program can be stored in a computer-readable storage medium. When the program is executed, it executes the steps of the above method embodiment; and the aforementioned storage medium includes: a mobile storage device, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, and other media that can store program codes.

[0033] Alternatively, if the above-mentioned integrated unit of the present invention is implemented in the form of a software function module and sold or used as an independent product, it can also be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the embodiment of the present invention can be essentially or partly reflected in the form of a software product that contributes to the prior art. The computer software product is stored in a storage medium and includes several instructions for a computer device (which can be a personal computer, server, or network device, etc.) to execute all or part of the methods described in each embodiment of the present invention. The aforementioned storage medium includes: various media that can store program codes, such as mobile storage devices, ROM, RAM, magnetic disks or optical disks.

[0034] The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art who is familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A method for controlling paper feeding of a printing press, characterized in that: The following steps are involved: Perform real-time flatness detection of printed paper in the printing press. If there is any abnormal flatness of the printed paper, trace the abnormal flatness of the printed paper and perform flatness control in the printing press; In a paper-feeding flat-grid printing machine, a photoelectric detection head is used to monitor the flatness abnormality of a target printing paper in real time, and an alarm signal is generated in the paper-feeding flat-grid printing machine based on the monitoring result; Based on the alarm signal, combined with the high-speed counter, the target printing paper is locked in the paper feeding and integration printing machine.

2. A printing press paper feeding control method according to claim 1, characterized in that: The printing paper flatness is detected in real time in the printing press. If there is an abnormal flatness of the printing paper, the abnormal flatness of the printing paper is traced and the flatness control process is performed in the printing press, specifically: The printing press that performs paper feeding control is calibrated as the target printing press, and the specification data of the target printing press is obtained, wherein the specification size of the target printing press describes the size of all printing papers that can be put into the target printing press, which is calibrated as the size of printing papers that can be put in, and also describes the maximum number of printing papers that can be put in, which is calibrated as the maximum number of printing papers that can be put in; Prepare printing paper with a size equal to the size of printing paper that can be inserted, mark it as target printing paper, and insert the target printing paper in a quantity equal to the maximum printing paper insertion quantity into the target printing press; In the target printing press, the position where the target printing paper is transported and fed is calibrated as the printing paper feeding position, and a laser displacement sensor is installed at the printing press feeding position, wherein the laser displacement sensor can measure the real-time paper height of the target printing paper; Wherein, the paper feeding position of the printing press includes a transmission gear and a paper feeding board; A target printing paper quantity-paper height comparison map is preset, and the target printing paper quantity is monitored in real time within the paper feeding position of the printing press, and is calibrated as the target printing paper real-time quantity, and based on the target printing paper quantity-paper height comparison map and the target printing paper real-time quantity, a standard paper height of the target printing paper is generated; Based on the laser displacement sensor, the real-time paper height of the target printing paper is measured. If the real-time paper height of the target printing paper is not equal to the standard paper height, the target printing paper is flattened at the paper feeding position of the printing press. If the real-time paper height of the target printing paper is equal to the standard paper height after the flattening process, the target printing press is calibrated as a flat-feeding grid printing press. If the real-time paper height of the target printing paper is still not equal to the standard paper height after the flattening process, the flatness anomaly is traced and flatness control is performed on the printing paper in the target printing press.

3. A printing press paper feeding control method according to claim 2, characterized in that: The method of tracing the source of abnormal flatness and controlling the flatness of printed paper in the target printing press is specifically as follows: In a target printing machine, a target printing paper sample is extracted, and the moisture content of the target printing paper sample is measured to obtain the real-time moisture content of the target printing paper sample, and a standard moisture content range of the target printing paper is preset; If the real-time moisture content of the target printing paper sample is not maintained within the standard moisture content range, an environmental humidification device is connected to the target printing machine, and a comparison table of air humidity and moisture content of the target printing paper is obtained; Based on the comparison table of air humidity and moisture content of target printing paper, combined with the standard moisture content range of target printing paper, the target air humidity is generated, and the environmental humidification equipment is controlled to adjust the air humidity to the target humidity in the target printing machine, so that the real-time moisture content of the target printing paper is maintained within the standard moisture content range; If the real-time moisture content of the target printing paper sample is maintained within the standard moisture content range, but the real-time paper height of the target printing paper is still not equal to the standard paper height, a real-time image of the paper feeding position of the printing press is obtained through an image acquisition device; The Canny edge detection operator is introduced to calculate the edge gradient of the printing press paper feed position in the real-time image of the printing press paper feed position, and the edge feature of the printing press paper feed position is obtained based on the edge gradient of the printing press paper feed position; The SIFT algorithm is introduced to perform scale convolution on the edge features at the paper feeding position of the printing press, and the scale-invariant feature points are extracted for feature smoothing construction to obtain the real-time smooth edge features at the paper feeding position of the printing press. Presetting the standard edge feature of the paper feeding position of the printing press, and calculating the overlap rate between the standard edge feature of the paper feeding position of the printing press and the real-time smooth edge feature, and calibrating it as the edge feature overlap rate; If the edge feature overlap rate is less than a preset value, it is proved that the target printing paper at the paper feeding position of the printing press is offset, and a first abnormal factor is recorded in the target printing press, wherein the first abnormal factor is that the target printing paper at the paper feeding position of the printing press is offset; If the edge feature overlap rate is not less than a preset value, a second abnormal factor is recorded in the target printing press, wherein the second abnormal factor is a defect at the paper feeding position of the printing press; Based on the first abnormality factor and the second abnormality factor, flatness control of the target printing paper is performed in the target printing press.

4. A printing press paper feeding control method according to claim 3, characterized in that: The flatness control of the target printing paper is performed in the target printing press based on the first abnormal factor and the second abnormal factor, specifically as follows: If the first abnormal factor is recorded in the target printing press, the transmission gear and the paper feeder board at the paper feeding position of the printing press are tightened, and the edge feature overlap rate is determined after the transmission gear and the paper feeder board are tightened to see whether it is still less than the preset value; If yes, a supporting paperboard is installed on the feeding paperboard, wherein the supporting paperboard is a paperboard for adjusting the position of the target printing paper, and can offset and adjust the target printing paper so that the edge feature overlap rate is not less than a preset value, and the real-time paper height of the target printing paper is equal to the standard paper height; If the second abnormal factor is recorded in the target printing press, the rotation speed of the rotating gear in the paper feeding position of the printing press is obtained, and the rotation speed of the rotating gear is adjusted to determine whether there is a rotation speed of the rotating gear that makes the real-time paper height of the target printing paper equal to the standard paper height; If yes, the speed of the corresponding rotating gear is calibrated as the target speed, and the speed of the rotating gear is controlled to be equal to the target speed, so as to achieve the flatness correction of the target printing paper; If not, replace the paper feeder board and tighten it after replacement. If the real-time paper height of the target printing paper is still not equal to the standard paper height after replacing the paper feeder board, install and run the paper blowing fan at the paper feeding position of the printing press to make the real-time paper height of the target printing paper equal to the standard paper height.

5. The method for controlling paper feeding of a printing press according to claim 1, characterized in that: In the paper feeding flattening and collating printing machine, the flatness abnormality of the target printing paper is monitored in real time by a photoelectric detection head, and an alarm signal is generated in the paper feeding flattening and collating printing machine based on the monitoring result, specifically: A photoelectric detection head is obtained in a paper-feeding flat-bed printer, and during the paper feeding process of the paper-feeding flat-bed printer, the paper information of the target printing paper is converted into an electrical signal by the photoelectric detection head in real time in combination with the photoelectric effect, and the electrical signal is calibrated as the target printing paper electrical signal, and uploaded to the paper-feeding flat-bed printer for storage; The target printing paper electrical signal records the real-time flatness of the target printing paper, and the real-time flatness of the target printing paper is obtained from the real-time paper height of the target printing paper; In a paper feeding and flat-grid printing machine, the target printing paper electrical signal is subjected to signal adaptive filtering, and the target printing paper electrical signal is subjected to recursive filtering in combination with the minimum mean square error criterion to obtain the target printing paper filtered electrical signal; If the real-time flatness of the target printing paper recorded in the target printing paper filter electrical signal is not maintained within a preset range, an alarm signal is generated in the paper leveling printing press, wherein the alarm signal is used to remind the paper leveling printing press that the real-time paper height of the target printing paper is not equal to the standard paper height.

6. A printing press paper feeding control method according to claim 1, characterized in that: Based on the alarm signal, combined with the high-speed counter, the target printing paper is locked in the paper feeding and integration printing machine, specifically: In a paper feeding and leveling printing press, a high-speed counter is obtained, wherein the high-speed counter is a counter for recording the number of target printing papers conveyed in real time; The maximum paper feed value is preset, the high-speed counter is initialized, and the high-speed counter is configured, wherein the high-speed counter is configured such that when an alarm signal is generated in the paper feed level integration grid printing machine or the paper feed amount of the paper feed level integration grid printing machine reaches the maximum paper feed value, the high-speed counter outputs the current paper feed amount in real time, and outputs an interrupt instruction in the high-speed counter, wherein the interrupt instruction is for the terminal paper feed level integration grid printing machine to feed paper and realize paper locking; The configured high-speed counter is started, and if the configured high-speed counter does not output an interrupt instruction in the paper feeding level integration printing machine when an alarm signal is generated in the paper feeding level integration printing machine, or when the paper feeding number of the paper feeding level integration printing machine reaches the maximum paper feeding value, the configured high-speed counter also does not output an interrupt instruction in the paper feeding level integration printing machine, then the configured high-speed counter is marked as an abnormally configured high-speed counter; The current working parameters of the abnormally configured high-speed counter are obtained, and the Bayesian network algorithm is introduced to trace the defects of the current working parameters of the abnormally configured high-speed counter, and the defect location of the abnormally configured high-speed counter is determined. At the same time, the maintenance plan of the defect location of the abnormally configured high-speed counter is retrieved and output in the big data network to obtain a qualified high-speed counter; When the qualified high-speed counter outputs an interrupt instruction, the paper feed leveling and grid printing press is controlled to control the flatness of the target printing paper.

7. A paper feeding control system for a printing press, characterized in that: The printing press paper feed control system comprises a memory and a processor, wherein the memory stores a printing press paper feed control method program, and when the printing press paper feed control method program is executed by the processor, the steps of the printing press paper feed control method according to any one of claims 1 to 6 are implemented: Perform real-time flatness detection of printed paper in the printing press. If there is any abnormal flatness of the printed paper, trace the abnormal flatness of the printed paper and perform flatness control in the printing press; In a paper-feeding flat-grid printing machine, a photoelectric detection head is used to monitor the flatness abnormality of a target printing paper in real time, and an alarm signal is generated in the paper-feeding flat-grid printing machine based on the monitoring result; Based on the alarm signal, combined with the high-speed counter, the target printing paper is locked in the paper feeding and integration printing machine.

8. A computer-readable storage medium, characterized in that: The computer-readable storage medium contains a printing press paper feed control method program, and when the printing press paper feed control method program is executed by a processor, the steps of the printing press paper feed control method described in any one of claims 1-6 are implemented.

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