A glue supply method and system for a packaging machine

Abstract

The present invention discloses a glue supply method and system for a packaging machine, including: successively connecting a glue supply bucket, a glue supply pump, a glue supply pipeline and a glue spraying head of a glue supply device; collecting a glue pressure signal in the glue supply pipeline and determining a pressure value according to the glue pressure signal; a controller receiving the pressure value, the controller including a pressure threshold range, when the pressure value is not within the pressure threshold range, the glue supply device is controlled to stop, and when the pressure value is within the pressure threshold range, the pressure value is stored in a sampling set; arranging the pressure values in the sampling set in the time sequence of sampling points, calculating the statistical data of each pressure value in the sampling set, and controlling the operation of the glue supply device according to the statistical data, wherein the statistical data includes any one or a combination of multiple of the average value of the differences between adjacent pressure values in the sampling set, the standard deviation of the differences between multiple consecutive adjacent glue pressure values, the process capability index of the differences between multiple consecutive adjacent pressure values, and the correlation coefficient of multiple consecutive adjacent pressure values.

Description

Technical Field

[0001] The present invention relates to the technical field of glue supply for tobacco packaging machines, and specifically, to a glue supply method and system for a packaging machine. Background Art

[0002] Automatic glue supply devices for packaging equipment are widely used in the tobacco industry, and can achieve a certain degree of stable glue supply control. However, in actual use, the glue supply system cannot complete the self-check function, and additional materials need to be added for glue detection, resulting in a large amount of capital and workload investment. Therefore, a glue detection system is generally not installed on general equipment, leading to uncontrollable and unstable glue supply processes, having a greater impact on the production process, and at the same time causing more material waste. Summary of the Invention

[0003] To solve at least one of the above problems, the present invention provides a glue supply method for a packaging machine, including: sequentially connecting a glue supply bucket, a glue supply pump, a glue supply pipeline, and a glue spraying head of a glue supply device; setting a detection device on the glue supply pipeline to collect the glue pressure signal in the glue supply pipeline, and determining a pressure value according to the glue pressure signal; the controller receives the pressure value through the detection device, the controller includes a pressure threshold range, when the pressure value is not within the pressure threshold range, the glue supply device is controlled to stop, and when the pressure value is within the pressure threshold range, the pressure value is stored in a sampling set; arranging the pressure values in the sampling set in the time sequence of sampling points, calculating the statistical data of each pressure value in the sampling set, and controlling the operation of the glue supply device according to the statistical data, where the statistical data includes any one or a combination of the average value of the differences between adjacent pressure values in the sampling set, the standard deviation of the differences between multiple consecutive adjacent glue pressure values, the process capability index of the differences between multiple consecutive adjacent pressure values, and the correlation coefficient of multiple consecutive adjacent pressure values.

[0004] Preferably, the step of controlling the operation of the glue supply device according to the average value of the differences between adjacent pressure values includes: calculating the differences between adjacent pressure values in the sampling set in real time, and calculating the average value of the differences between adjacent pressure values in real time; evaluating the average value according to a preset average value threshold range, and when the average value is not within the average value threshold range, controlling the glue supply device to stop.

[0005] Preferably, the step of controlling the operation of the glue supply device according to the standard deviation of multiple adjacent pressure differences further includes: presetting a standard deviation set threshold, when the number of pressure values in the sampling set is equal to the standard deviation set threshold, generating a standard deviation set, the standard deviation set including all the pressure values in the sampling set arranged in time sequence; calculating the standard deviation of the differences between adjacent pressure values in the standard deviation set; evaluating the standard deviation according to a preset standard deviation threshold interval, and when the standard deviation is not within the standard deviation threshold interval, controlling the glue supply device to stop; when the number of pressure values in the sampling set is greater than the standard deviation set threshold, selecting the pressure values corresponding to the standard deviation set threshold at the end of the time sequence in the sampling set to generate a new standard deviation set.

[0006] Preferably, the step of calculating the process capability index according to multiple consecutive adjacent pressure value differences includes: presetting a process capability index set threshold, when the number of pressure values in the sampling set is equal to the process capability index set threshold, generating a process capability index set, the process capability index set including all the pressure values in the sampling set arranged in time sequence; calculating the process capability index of the differences between adjacent pressure values in the process capability index set; evaluating the process capability index according to a preset process capability index threshold interval, and when the process capability index is not within the process capability index threshold interval, controlling the glue supply device to stop; when the number of pressure values in the sampling set is greater than the process capability index set threshold, selecting the pressure values corresponding to the process capability index set threshold at the end of the time sequence in the sampling set to generate a new standard deviation set.

[0007] Preferably, the step of controlling the operation of the glue supply device according to the correlation coefficient of multiple consecutive adjacent pressure values includes: presetting a correlation coefficient set threshold, when the number of pressure values in the sampling set is equal to the correlation coefficient set threshold, generating a correlation coefficient set, the correlation coefficient set including all the pressure values in the sampling set arranged in time sequence; presetting a reference coefficient, calculating the correlation coefficient based on the reference coefficient and the adjacent pressure values in the correlation coefficient set; evaluating the correlation coefficient according to a preset correlation coefficient threshold interval, and when the correlation coefficient is not within the correlation coefficient threshold interval, controlling the glue supply device to stop; when the number of pressure values in the sampling set is greater than the process capability index set threshold, selecting the pressure values corresponding to the process capability index set threshold at the end of the time sequence in the sampling set to generate a new standard deviation set.

[0008] Preferably, it further includes: storing the statistical data; when the number of times the glue supply device stops based on the statistical data is zero, determining the average threshold interval according to the average value of the difference between adjacent pressure values stored, determining the standard deviation threshold interval according to the standard deviation of the difference between adjacent pressure values stored, determining the process capability index threshold interval according to the process capability index of the difference between adjacent pressure values stored, and determining the correlation coefficient threshold interval according to the correlation coefficient of adjacent pressure values stored.

[0009] Preferably, when the number of times the glue supply device stops based on the statistical data is zero, determining a reference coefficient according to the difference between adjacent pressure values of the sampling set.

[0010] On the other hand, a glue supply system for a packaging machine is provided, including: a glue supply device, the glue supply device includes a glue supply barrel, a glue supply pump, a glue supply pipeline and a glue spraying head that are connected in sequence; a detection device, the detection device is arranged on the glue supply pipeline, and the detection device is used to collect the glue pressure signal in the glue supply pipeline and determine the pressure value according to the glue pressure signal; a controller, the controller is connected to the detection device to receive the pressure value, the controller is connected to the glue supply device, and the controller further includes a control unit, and the control unit controls the operation of the glue supply device by using any one of the previous packaging machine glue supply methods.

[0011] The glue supply method and system of the present invention have the following beneficial effects: it can stabilize the glue supply pressure within a normal range, and uses an intelligent control algorithm for the glue supply process to detect the change law of the glue supply pressure value and automatically judge whether there is an abnormality in the glue supply process, greatly improving the stability of the glue supply system and reducing the impact and waste on the production process. Description of the Drawings

[0012] In order to better understand the above and other objects, features, advantages and functions of the present invention, reference may be made to the embodiments shown in the drawings. The same reference numerals in the drawings refer to the same components. Those skilled in the art should understand that the drawings are intended to schematically illustrate the preferred embodiments of the present invention and have no restrictive effect on the scope of the present invention, and the components in the drawings are not drawn to scale.

[0013] Figure 1 Shows a schematic flow chart of the glue supply method for a packaging machine according to an embodiment of the present invention;

[0014] Figure 2 Shows another schematic flow chart of the glue supply method for a packaging machine according to an embodiment of the present invention;

[0015] Figure 3 Shows a schematic diagram of the glue supply device and the detection device of the glue supply system for a packaging machine according to an embodiment of the present invention;

[0016] Figure 4 Schematic diagram of the glue supply pressure change curve when the glue supply pump of the glue supply device of the packaging machine glue supply system according to an embodiment of the present invention is running;

[0017] Figure 5 Schematic diagram of the pressure change curve in the shutdown state of the glue supply device of the packaging machine glue supply system according to an embodiment of the present invention;

[0018] Figure 6 Schematic diagram of the glue supply pressure change curve when the glue supply device of the packaging machine glue supply system according to an embodiment of the present invention is running normally.

[0019] Reference numerals:

[0020] 1. Glue supply bucket; 2. Glue supply pump; 3. Glue supply pipeline; 4. Glue spraying head; 5. Detection device. Detailed implementation manners

[0021] The following describes exemplary embodiments of the present disclosure with reference to the accompanying drawings. Various details of the embodiments of the present disclosure are included to assist understanding, and they should be considered merely exemplary. Therefore, those of ordinary skill in the art should recognize that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of the present disclosure. Similarly, for clarity and conciseness, descriptions of well-known functions and structures are omitted in the following.

[0022] The term "including" and its variations used herein mean open inclusion, that is, "including but not limited to". Unless otherwise stated, the term "or" means "and / or". The term "based on" means "at least partially based on". The term "an exemplary embodiment" and "an embodiment" mean "at least one exemplary embodiment". The term "another embodiment" means "at least one additional embodiment". The terms "first", "second", etc. may refer to different or the same objects. There may also be other explicit and implicit definitions hereinafter.

[0023] To at least partially solve one or more of the above problems and other potential problems, an embodiment of the present disclosure provides a method for supplying glue to a packaging machine, including: sequentially connecting a glue supply barrel, a glue supply pump, a glue supply pipeline, and a glue spraying head of a glue supply device; arranging a detection device in the glue supply pipeline to collect a glue pressure signal in the glue supply pipeline and determine a pressure value according to the glue pressure signal; the controller receives the pressure value through the detection device, and the controller includes a pressure threshold range. When the pressure value is not within the pressure threshold range, the glue supply device is controlled to stop. When the pressure value is within the pressure threshold range, the pressure value is stored in a sampling set; the pressure values in the sampling set are arranged according to the time sequence of sampling points, statistical data of each pressure value in the sampling set is calculated, and the operation of the glue supply device is controlled according to the statistical data, where the statistical data includes any one or a combination of the average value of the differences between adjacent pressure values in the sampling set, the standard deviation of the differences between multiple consecutive adjacent glue pressure values, the process capability index of the differences between multiple consecutive adjacent pressure values, and the correlation coefficient of multiple consecutive adjacent pressure values.

[0024] Specifically, as Figure 3 shown in the glue supply device, the glue supply barrel 1 provides a glue accommodation space. The glue supply pump 2 is connected to the glue supply barrel 1 and the glue supply pipeline 3 to provide the power for the glue to flow from the glue supply barrel 1 to the glue supply pipeline 3 through the glue supply pump 2. The other end of the glue supply pipeline 3 is connected to the glue spraying head 4, and the glue flows out from the glue spraying head 4 after flowing through the glue supply pipeline 3 from the glue supply barrel 1. The detection device 5 uses a pressure sensor to detect the glue pressure information in the glue supply pipeline 3, and determines the corresponding glue pressure value through signal conversion of the glue pressure information.

[0025] The controller is connected to the glue supply pump 2 and / or the glue spraying head 4 of the glue supply device to control the operation of the glue supply device, including controlling the start and / or stop of the glue supply device.

[0026] During the glue supply process of the glue supply device, after the glue supply pump 2 runs once to supply glue, the glue spraying head 4 sprays glue multiple times, and the detection device collects the glue pressure information according to the set sampling period. In some embodiments, the controller collects the number of glue spraying times through the glue spraying head 4, and when the number of glue spraying times is equal to the preset sampling period, the detection device 5 is controlled to sample. For example, the preset sampling period is 3 times, 4 times, or 5 times, etc.

[0027] The controller receives the glue pressure value determined by the detection device and controls the glue supply device according to a preset pressure threshold range. The preset pressure threshold range is used to determine whether the pressure value is abnormal. When the glue pressure value is not within the pressure threshold range, it is determined that the glue pressure value is abnormal, and then the detection device is controlled to stop, for example, controlling the glue supply pump 2 and / or the glue spraying head 4 to stop. When the glue pressure value is within the pressure threshold range, it is determined that the glue pressure value is normal, and then the glue pressure value is stored. Further, statistical calculations are performed on the stored glue pressure values to determine their statistical data, and the operation of the detection device is controlled according to the evaluation result of the statistical data, including controlling the glue supply pump 2 and / or the glue spraying head 4 to stop.

[0028] In some embodiments, the step of controlling the operation of the glue supply device according to the average value of the differences between adjacent pressure values includes: calculating in real time the differences between adjacent pressure values in the sampling set, and calculating in real time the average value of the differences between adjacent pressure values; evaluating the average value according to a preset average value threshold range, and when the average value is not within the average value threshold range, controlling the glue supply device to stop.

[0029] Specifically, as Figure 1 shown, the pressure values in the sampling set are arranged in time sequence according to the sampling point time corresponding to each pressure value. The controller calculates in real time the difference d between adjacent pressure values P and calculates the average value of the difference d. For example, in the sampling set (Pt1, Pt2, Pt3,..., Ptn), Pt1 is the pressure value corresponding to the sampling point at time t1, Ptn is the pressure value corresponding to the sampling point at time tn, and t1 to tn are the sampling point times that occur in sequence. Among them, the difference d1 between adjacent sampling points is the value of Pt2 minus Pt1, d2 is the value of Pt3 minus Pt2, and di is the value of Pti minus Pt(i + 1). Calculate the average value of the difference d, and determine whether the average value is abnormal according to the average value threshold range [d min , d max . When the average value is not within the average value threshold range, the glue supply pump 2 and / or the glue spraying head 4 stop; when the average value is within the threshold range, the average value is stored. Those skilled in the art can understand that the number of glue pressure values in the sampling set will continue to increase as the number of sampling points increases, and the number of differences d also gradually increases. Then, the average value of the differences d is the average value of all the differences d determined by all the pressure values in the sampling set determined in real time. For example, the differences calculated from the sampling set (Pt1, Pt2, Pt3,..., Ptn) include d1, d2,..., d(n - 1), and the average value of the differences between adjacent pressure values in the sampling set is the average value of d1, d2,..., d(n - 1).

[0030] In some embodiments, the step of controlling the operation of the glue supply device according to the standard deviation of multiple adjacent pressure differences further includes: presetting a standard deviation set threshold, and generating a standard deviation set when the number of pressure values in the sampling set is equal to the standard deviation set threshold; calculating the standard deviation of the differences between adjacent pressure values in the standard deviation set; evaluating the standard deviation according to a preset standard deviation threshold interval, and controlling the glue supply device to stop when the standard deviation is not within the standard deviation threshold interval; when the number of pressure values in the sampling set is greater than the standard deviation set threshold, select the pressure values corresponding to the standard deviation set threshold at the time series end in the sampling set to generate a new standard deviation set.

[0031] Specifically, as Figure 2 shown, as described above, the number of glue pressure values in the sampling set gradually increases with the continuation of sampling, and the standard deviation set threshold is used to provide the number for generating the standard deviation set. For example, the standard deviation set threshold is 30, and the controller counts the number of pressure values in the sampling set. When n of the pressure value Ptn is equal to 30, a standard deviation set is generated, and the standard deviation set is equal to the sampling set, that is, (Pt1, Pt2, Pt3,..., Pt30). The differences d between adjacent pressure values in the set are calculated in turn to obtain a difference set (d1, d2,..., d29), and the standard deviation σ of the differences in this difference set is calculated. Determine whether the standard deviation σ is abnormal according to the standard deviation threshold interval. The standard deviation threshold interval is [σ min , σ max . When the standard deviation σ is not within the standard deviation threshold interval, it is determined that the standard deviation is abnormal, and the glue supply device is controlled to stop; when the standard deviation σ is within the standard deviation threshold interval, the standard deviation is stored. It should be noted that as the number of pressure values in the sampling set increases and is greater than the standard deviation set threshold, for example, when tn is equal to 31, the pressure values corresponding to the standard deviation set threshold are selected from the time series end of the sampling set to generate a new standard deviation set (Pt2, Pt3,..., Pt30, Pt31), which is updated in real time. When tn in the sampling set is equal to 60, the standard deviation set is (Pt31, Pt32,..., Pt59, Pt60). The standard deviation of the differences between adjacent pressure values is calculated in real time for the updated standard deviation set, and the glue supply device is controlled according to the evaluation result based on the standard deviation threshold interval.

[0032] In some embodiments, the steps of calculating the process capability index based on the differences between multiple consecutive adjacent pressure values include: presetting a threshold for the process capability index set. When the number of pressure values in the sampling set is equal to the threshold for the process capability index set, a process capability index set is generated. The process capability index set includes all the pressure values in the sampling arranged in time sequence. Calculate the process capability index of the differences between adjacent pressure values in the process capability index set. Evaluate the process capability index according to a preset process capability index threshold range. When the process capability index is not within the process capability index threshold range, control the glue supply device to stop. When the number of pressure values in the sampling set is greater than the threshold for the process capability index set, select the corresponding number of pressure values at the end of the time sequence in the sampling set to generate a new standard deviation set.

[0033] Specifically, as described above, the number of glue pressure values in the sampling set gradually increases with the continuation of sampling. The threshold for the process capability index set is used to provide the number for generating the process capability index set. For example, the process capability index threshold is 40. The controller counts the number of pressure values in the sampling set. When the n of the pressure value Ptn is equal to 40, a process capability index set is generated. The process capability index set is equal to the sampling set, that is, (Pt1, Pt2, Pt3, …… Pt40). Calculate the differences d between adjacent pressure values in the set in sequence to obtain a set of differences d (d1, d2 …… d39), and calculate the process capability index CPK of the differences in this difference set. Judge whether the process capability index is abnormal according to the process capability index threshold range. The process capability index threshold range is [CPK min , CPK max . When the process capability index CPK is not within the process capability index threshold range, it is judged that the standard deviation is abnormal, and the glue supply device is controlled to stop. When the process capability index CPK is within the process capability index threshold range, the standard deviation is stored. It should be noted that as the number of pressure values in the sampling set increases and when it is greater than the threshold for the process capability index set, for example, when tn is equal to 41, select the corresponding number of pressure values at the end of the time sequence in the sampling set to generate a new process capability index set (Pt2, Pt3, …… Pt40, Pt41), and update it in real time. When tn in the sampling set is equal to 60, the process capability index set is (Pt21, Pt22, …… Pt59, Pt60). Calculate the process capability index of the differences between adjacent pressure values in the updated process capability index set in real time, and control the glue supply device according to the evaluation result based on the process capability index threshold range.

[0034] In some embodiments, the steps of controlling the operation of the glue supply device according to the correlation coefficients of multiple consecutive adjacent pressure values include: presetting a correlation coefficient set threshold, and when the number of pressure values in the sampling set is equal to the correlation coefficient set threshold, generating a correlation coefficient set, where the correlation coefficient set includes all the pressure values in the sampling arranged in time sequence; presetting a reference coefficient, and calculating the correlation coefficient based on the reference coefficient and the adjacent pressure values in the correlation coefficient set; evaluating the correlation coefficient according to a preset correlation coefficient threshold interval, and when the correlation coefficient is not within the correlation coefficient threshold interval, controlling the glue supply device to stop; when the number of pressure values in the sampling set is greater than the process capability index set threshold, selecting the corresponding number of pressure values at the time sequence end in the sampling set to generate a new standard deviation set.

[0035] Specifically, as Figure 2 shown, as described above, the number of glue pressure values in the sampling set gradually increases with the continuation of sampling. The preset correlation coefficient set threshold is used to provide the number for generating the standard deviation set. For example, the correlation coefficient set threshold is 40. The controller counts the number of pressure values in the sampling set. When the n of the pressure value Ptn is equal to 40, a correlation coefficient set X is generated. The correlation coefficient set X is equal to the sampling set (Pt1, Pt2, Pt3, …… Pt40), and the standard deviation σ of the pressure values in this correlation coefficient set X is calculated. The reference coefficient is the reference set Y corresponding to the correlation coefficient set X corresponding to the correlation coefficient set. Calculate the correlation coefficient between the reference set Y and the correlation coefficient set X. Then the correlation coefficient formula is as follows:

[0036]

[0037] where Cov(X,Y) is the covariance between X and Y, Var[X] is the variance of X, and Var[Y] is the variance of Y. Determine whether the correlation coefficient r is abnormal according to the correlation coefficient threshold interval. The correlation coefficient threshold interval is [r min , r max . When the correlation coefficient r is not within the correlation coefficient threshold interval, it is determined that the correlation coefficient is abnormal, and then the glue supply device is controlled to stop; when the correlation coefficient r is within the correlation coefficient threshold interval, the correlation coefficient is stored. It should be noted that as the number of pressure values in the sampling set increases and when it is greater than the correlation coefficient set threshold, for example, tn is equal to 41, then select the corresponding number of pressure values at the time sequence end of the sampling set to generate a new correlation coefficient set (Pt2, Pt3, …… Pt40, Pt41), and update it in real time. When tn in the sampling set is equal to 60, the correlation coefficient set is (Pt21, Pt22, …… Pt59, Pt60). Calculate the correlation coefficient r of the updated correlation coefficient set in real time, and control the glue supply device according to the evaluation result based on the correlation coefficient threshold interval.

[0038] In some embodiments, it further includes: storing statistical data; when the number of times the glue supply device stops based on the statistical data is equal to zero, determining an average threshold interval according to the average value of the stored difference between adjacent pressure values, determining a standard deviation threshold interval according to the standard deviation of the stored difference between adjacent pressure values, determining a process capability index threshold interval according to the process capability index of the stored difference between adjacent pressure values, and determining a correlation coefficient threshold interval according to the correlation coefficient of the stored multiple consecutive adjacent pressure values.

[0039] Specifically, the previously calculated average value, standard deviation, process capability index, and correlation coefficient are stored in real time. When the glue supply device stops according to the operation requirements, evaluate the number of times the glue supply device stops due to any abnormality in the glue pressure value threshold evaluation or the statistical data. When the number of stops is zero, determine the threshold intervals of each statistical data in the next glue supply program according to the statistical data. For example, determine the average threshold interval according to the maximum average value and the minimum average value among the multiple average values in the statistical data, with the maximum average value as the upper limit of the average threshold interval and the minimum average value as the lower limit of the average threshold interval; determine the standard deviation threshold interval according to the maximum standard deviation and the minimum standard deviation in the statistical data, with the maximum standard deviation as the upper limit of the standard deviation threshold interval and the minimum standard deviation as the lower limit of the standard deviation threshold interval; determine the process capability index threshold interval according to the maximum process capability index and the minimum process capability index in the process capability index, with the maximum process capability index as the upper limit of the process capability index threshold interval and the minimum process capability index as the lower limit of the process capability index threshold interval; determine the correlation coefficient threshold interval according to the maximum correlation coefficient and the minimum correlation coefficient in the correlation coefficient, with the maximum correlation coefficient as the upper limit of the correlation coefficient threshold interval and the minimum correlation coefficient as the lower limit of the correlation coefficient threshold interval. In other embodiments, the average threshold interval, standard deviation threshold interval, process capability index threshold interval, and correlation coefficient threshold interval of each statistical data can also be set according to actual needs.

[0040] In some embodiments, when the number of times the glue supply device stops based on the statistical data is equal to zero, determine a reference coefficient according to the difference between adjacent pressure values of the sampling set.

[0041] Specifically, when the number of times of stopping due to statistical data is equal to zero, the sampling set includes multiple correlation coefficient sets, and each of the multiple correlation coefficient sets corresponds to a correlation coefficient set. Select the correlation coefficient set corresponding to the correlation coefficient closest to 1 according to the correlation coefficients corresponding to each correlation coefficient set, and use this correlation coefficient set as the reference coefficient.

[0042] On the other hand, a glue supply system for a packaging machine is provided, including: a glue supply device, which includes a glue supply barrel, a glue supply pump, a glue supply pipeline, and a glue spraying head that are connected in sequence; a detection device, which is arranged on the glue supply pipeline and is used to collect the glue pressure signal in the glue supply pipeline and determine the pressure value according to the glue pressure signal; a controller, which is connected to the detection device to receive the pressure value, and is connected to the glue supply device. The controller further includes a control unit, and the control unit controls the operation of the glue supply device by using any of the previous glue supply methods for the packaging machine.

[0043] Specifically, the controller includes a detection signal input module, a fault diagnosis module, and a signal output module. The detection signal input module is used to connect to the detection device to receive the pressure value; the fault diagnosis module generates a control signal for controlling the glue supply device by using the aforementioned glue supply method for the packaging machine according to the pressure value received by the detection module, that is, it judges a fault when the pressure value and the statistical data determined based on the pressure value are abnormal, and outputs a shutdown signal; the signal output module is connected to the glue supply device to output the shutdown signal to the glue supply device to control the shutdown of the glue supply pump and / or the glue spraying head.

[0044] In some embodiments, the controller is a device including a processor and a memory. The memory includes computer program instructions, and when the computer program instructions are run by the processor, they implement any of the previous glue supply methods for the packaging machine. The controller controls the glue supply process by sending a shutdown signal to the glue supply device to trigger the fault display and fault shutdown of the glue supply device. In other embodiments, the control system of the glue supply device is an embedded control system. The glue supply device includes a controller, a glue supply pump, a glue spraying head, etc. The controller is respectively connected to the glue supply pump and the glue spraying head to realize the start-up and / or shutdown control of the glue supply pump and the glue spraying head. In still other embodiments, the controller is an independent control module of the glue supply pump 2, and the controller controls the shutdown of the glue supply pump 2 based on the shutdown signal generated from the glue pressure value and the statistical data. In other embodiments, the glue supply device further includes a central unit, and the central unit is connected to the glue supply pump 2 and the nozzle 4. The controller controls the operation of the glue supply pump 2 and the nozzle 4 through the central unit.

[0045] The embodiments of the present disclosure have been described above. The above description is exemplary and not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes are obvious to those of ordinary skill in the art in the technical field without departing from the scope and spirit of the described embodiments. The selection of the terms used herein is intended to best explain the principles of the embodiments, the actual application, or the improvement of the technology in the market, or to enable other ordinary technical personnel in the technical field to understand the present disclosure.

Claims

1. A method for supplying glue to a packaging machine, characterized in that, Including: Successively connecting a glue supply bucket, a glue supply pump, a glue supply pipeline and a glue spraying head of a glue supply device; A detection device is arranged on the glue supply pipeline to collect a glue pressure signal in the glue supply pipeline and determine a pressure value according to the glue pressure signal; The controller receives the pressure value through the detection device. The controller includes a pressure threshold range. When the pressure value is not within the pressure threshold range, the glue supply device is controlled to stop. When the pressure value is within the pressure threshold range, the pressure value is stored in a sampling set; Arrange the pressure values in the sampling set according to the time sequence of sampling points, calculate the statistical data of each pressure value in the sampling set, and control the operation of the glue supply device according to the statistical data. Wherein, the statistical data includes one or a combination of the average value of the differences between adjacent pressure values in the sampling set, the standard deviation of the differences between multiple consecutive adjacent glue pressure values, the process capability index of the differences between multiple consecutive adjacent pressure values, and the correlation coefficient of multiple consecutive adjacent pressure values; The steps of calculating the process capability index of the differences between multiple consecutive adjacent pressure values include: presetting a process capability index set threshold. When the number of pressure values in the sampling set is equal to the process capability index set threshold, generating a process capability index set, and the process capability index set includes all the pressure values in the sampling set arranged based on the time sequence; calculating the process capability index of the differences between adjacent pressure values in the process capability index set; evaluating the process capability index according to a preset process capability index threshold range. When the process capability index is not within the process capability index threshold range, controlling the glue supply device to stop; when the number of pressure values in the sampling set is greater than the process capability index set threshold, selecting the pressure values corresponding to the process capability index set threshold at the time sequence end in the sampling set to generate a new standard deviation set; The steps of controlling the operation of the glue supply device according to the correlation coefficient of multiple consecutive adjacent pressure values include: presetting a correlation coefficient set threshold. When the number of pressure values in the sampling set is equal to the correlation coefficient set threshold, generating a correlation coefficient set, and the correlation coefficient set includes all the pressure values in the sampling set arranged based on the time sequence; presetting a reference coefficient, and calculating the correlation coefficient based on the reference coefficient and the adjacent pressure values in the correlation coefficient set; evaluating the correlation coefficient according to a preset correlation coefficient threshold range. When the correlation coefficient is not within the correlation coefficient threshold range, controlling the glue supply device to stop; when the number of pressure values in the sampling set is greater than the process capability index set threshold, selecting the pressure values corresponding to the process capability index set threshold at the time sequence end in the sampling set to generate a new standard deviation set.

2. The method according to claim 1, characterized in that, The steps of controlling the operation of the glue supply device according to the average value of the differences between adjacent pressure values include: Calculating the difference between adjacent pressure values in the sampling set in real time and calculating the average value of the differences between adjacent pressure values in real time; Evaluating the average value according to a preset average value threshold range. When the average value is not within the average value threshold range, controlling the glue supply device to stop.

3. The method according to claim 2, wherein The steps of controlling the operation of the glue supply device according to the standard deviation of multiple adjacent pressure differences further include: Presetting a standard deviation set threshold. When the number of pressure values in the sampling set is equal to the standard deviation set threshold, a standard deviation set is generated, and the standard deviation set includes all the pressure values in the sampling set arranged in time sequence; Calculating the standard deviation of the differences between adjacent pressure values in the standard deviation set; Evaluating the standard deviation according to a preset standard deviation threshold interval. When the standard deviation is not within the standard deviation threshold interval, controlling the glue supply device to stop; when the number of pressure values in the sampling set is greater than the standard deviation set threshold, selecting the pressure values corresponding to the standard deviation set threshold at the end of the time sequence in the sampling set to generate a new standard deviation set.

4. The method according to claim 3, characterized in that, It further includes: Storing the statistical data; When the number of times the glue supply device stops based on the statistical data is equal to zero, determining the average value threshold interval according to the average value of the differences between adjacent pressure values stored, determining the standard deviation threshold interval according to the standard deviation of the differences between adjacent pressure values stored, determining the process capability index threshold interval according to the process capability index of the differences between adjacent pressure values stored, and determining the correlation coefficient threshold interval according to the correlation coefficient of the adjacent pressure values stored.

5. The method according to claim 4, characterized in that, When the number of times the glue supply device stops based on the statistical data is equal to zero, determining a reference coefficient according to the differences between adjacent pressure values in the sampling set.

6. A glue supply system for a packaging machine, characterized in that, It includes: A glue supply device, which includes a glue supply barrel, a glue supply pump, a glue supply pipeline and a glue spraying head connected in sequence; A detection device, which is arranged on the glue supply pipeline. The detection device is used to collect the glue pressure signal in the glue supply pipeline and determine the pressure value according to the glue pressure signal; A controller, which is connected to the detection device to receive the pressure value. The controller is connected to the glue supply device. The controller further includes a control unit, and the control unit controls the operation of the glue supply device by using any one of the methods in claims 1-5.

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