Power-off protection method of injection blow molding machine

Abstract

The invention relates to the technical field of injection blowing hollow forming machines, in particular to a power-off protection method for an injection blowing hollow forming machine. Calculating operation characterization parameters of the injection-blow hollow forming machine according to the temperature of the heating machine barrel and the continuous working duration of the heating machine barrel under the preset temperature condition, dividing the working state of the injection-blow hollow forming machine, and adopting corresponding power-off protection strategies, including calculating defect characterization parameters, calculating defect characterization parameters and calculating the defect characterization parameters; the method comprises the following steps of: monitoring the load condition of the injection-blow hollow forming machine, adjusting the recording frequency of the operation data of the injection-blow hollow forming machine and judging whether the injection-blow hollow forming machine is shut down or acquiring the current of the injection-blow hollow forming machine in real time, identifying whether the injection-blow hollow forming machine is abnormal or not according to the current, and judging whether power-off protection is adopted or not. Therefore, corresponding power-off protection can be adopted for the injection-blow hollow forming machine in different operation states, and the reliability of power-off protection is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of injection-blow hollow molding machines, and particularly relates to a power-off protection method for an injection-blow hollow molding machine. Background Art

[0002] An injection-blow hollow molding machine is a device used for producing hollow plastic products, and is usually used in the plastic processing industry. This machine mainly includes two parts: an injection molding machine and a blow molding machine. By injecting molten plastic into a mold, a certain shape is formed in the mold, and then it is blow-molded by the blow molding machine to form a hollow structure in the mold.

[0003] For example, Chinese Patent Publication No.: CN114161684A discloses an injection-blow hollow molding machine for medicine bottle processing, which includes a workbench. An injection body, a support frame and an injection-blow hollow molding assembly are installed at the upper end of the workbench. A feeding hopper is connected to the upper end of the injection body, and the discharging end of the injection body is connected to the feeding end of the injection-blow hollow molding assembly. An electrical control cabinet and an industrial control computer are fixedly installed on the support frame. An isolation cover is fixed on the outer wall of the injection-blow hollow molding assembly, and an adjustable conveying and discharging structure is also fixed on the front side wall of the workbench.

[0004] As a core device for precision production of hollow plastic products (such as pharmaceutical packaging, cosmetic containers, etc.), the production process of an injection-blow hollow molding machine highly depends on continuous and stable power supply. Power-off of the device caused by problems such as power supply interruption, power fluctuation, and voltage instability may cause the high-temperature melt to cool and shrink and adhere to metal components, resulting in phenomena such as wear or jamming of the screw or barrel. Therefore, power-off protection for an injection-blow hollow molding machine is crucial.

[0005] However, the following problems still exist in the prior art. In the prior art, the load condition of the injection-blow hollow molding machine is not monitored. Overload of the injection-blow hollow molding machine is often the reason for abnormal operation and sudden power-off of the injection-blow hollow molding machine. The injection-blow hollow molding machine in different load states is not monitored, and different power-off protection measures are not taken, resulting in low reliability of power-off protection for the injection-blow hollow molding machine. Summary of the Invention

[0006] Therefore, the present invention provides a power-off protection method for an injection-blow hollow molding machine to overcome the problems in the prior art that the load condition of the injection-blow hollow molding machine is not monitored, overload of the injection-blow hollow molding machine is often the reason for abnormal operation and sudden power-off of the injection-blow hollow molding machine, the injection-blow hollow molding machine in different load states is not monitored, and different power-off protection measures are not taken, resulting in low reliability of power-off protection for the injection-blow hollow molding machine.

[0007] To achieve the above object, the present invention provides a power-off protection method for an injection blow hollow molding machine, which includes: Step S1, obtaining the start-stop times of the injection blow hollow molding machine within a preset time, obtaining the temperature of the heating barrel according to a temperature sensor, and obtaining the continuous working duration of the heating barrel under a preset temperature condition; Step S2, calculating an operation characterization parameter of the injection blow hollow molding machine according to the start-stop times, the temperature of the heating barrel, and the continuous working duration of the heating barrel under the preset temperature condition; Step S3, dividing the working state of the injection blow hollow molding machine according to the operation characterization parameter of the injection blow hollow molding machine; Step S4, according to the working state of the injection blow hollow molding machine, adopting a corresponding power-off protection strategy, including, obtaining an audio signal during the operation of the injection blow hollow molding machine according to an audio acquisition unit, and obtaining a product image of the injection blow hollow molding machine according to an image acquisition unit, identifying the product defect rate of the injection blow hollow molding machine, calculating a defect characterization parameter according to the amplitude of the audio signal in combination with the product defect rate of the injection blow hollow molding machine, adjusting the recording frequency of the operation data of the injection blow hollow molding machine, and determining whether to stop the machine; or, obtaining the current of the injection blow hollow molding machine in real time, identifying whether the injection blow hollow molding machine has an abnormality according to the current, and determining whether to adopt power-off protection.

[0008] Further, the process of calculating the operation characterization parameter of the injection blow hollow molding machine includes, calculating the ratio of the start-stop times within the preset time to the preset start-stop times threshold as the start-stop operation characterization factor; calculating the ratio of the temperature of the heating barrel to the preset heating barrel temperature threshold as the heating barrel operation characterization factor; calculating the ratio of the continuous working duration under the preset temperature condition to the preset continuous working duration threshold as the operation working duration characterization factor; weighted summing the start-stop operation characterization factor, the heating barrel operation characterization factor, and the operation working duration characterization factor to obtain the operation characterization parameter of the injection blow hollow molding machine.

[0009] Further, in the step S3, the step of dividing the working state of the injection blow hollow molding machine according to the operation characterization parameter of the injection blow hollow molding machine includes: comparing the operation characterization parameter of the injection blow hollow molding machine with a preset comparison threshold of the operation characterization parameter of the injection blow hollow molding machine; if the operation characterization parameter of the injection blow hollow molding machine is greater than the preset comparison threshold of the operation characterization parameter of the injection blow hollow molding machine, dividing the working state of the injection blow hollow molding machine into a strong hidden danger working state; If the operating characterization parameter of the injection blow hollow molding machine is less than or equal to the preset comparison threshold of the operating characterization parameter of the injection blow hollow molding machine, the working state of the injection blow hollow molding machine is classified as a weak hidden danger working state.

[0010] Further, in the step S4, according to the working state of the injection blow hollow molding machine, a corresponding power-off protection strategy is adopted, where, If the working state of the injection blow hollow molding machine is a strong hidden danger working state, then according to the audio signal acquired by the audio acquisition unit during the operation of the injection blow hollow molding machine, and according to the product image acquired by the image acquisition unit of the injection blow hollow molding machine, the defect rate of the products of the injection blow hollow molding machine is identified, and the defect characterization parameter is calculated by combining the amplitude of the audio signal with the defect rate of the products of the injection blow hollow molding machine, and the recording frequency of the operation data of the injection blow hollow molding machine is adjusted and it is determined whether to stop the machine; If the working state of the injection blow hollow molding machine is a weak hidden danger working state, then the current of the injection blow hollow molding machine is acquired in real time, and whether the injection blow hollow molding machine has an abnormality is identified according to the current, and it is determined whether to adopt power-off protection.

[0011] Further, in the step S4, the steps of identifying the defect rate of the products of the injection blow hollow molding machine according to the product image acquired by the image acquisition unit include: Continuously acquire the product images of the injection blow hollow molding machine; Acquire the contours of each product of the injection blow hollow molding machine in the product image of the injection blow hollow molding machine; Determine whether the products of the injection blow hollow molding machine have defects according to the similarity between the product contour of the injection blow hollow molding machine and the preset comparison contour of the products of the injection blow hollow molding machine; Obtain the ratio of the number of defective products of the injection blow hollow molding machine to the total number of products of the injection blow hollow molding machine in the same batch as the defect rate of the products of the injection blow hollow molding machine; Among them, the similarity between the product contour of the injection blow hollow molding machine and the preset comparison contour of the products of the injection blow hollow molding machine is compared with the preset similarity comparison threshold, If the similarity between the product contour of the injection blow hollow molding machine and the preset comparison contour of the products of the injection blow hollow molding machine is less than the preset similarity comparison threshold, it is determined that the products of the injection blow hollow molding machine have defects.

[0012] Further, the process of calculating the defect characterization parameter includes, Calculate the ratio of the amplitude of the audio signal during the operation of the injection blow hollow molding machine to the preset amplitude threshold as the audio defect characterization factor; Calculate the ratio of the defect rate of the products of the injection blow hollow molding machine to the preset defect rate threshold of the products of the injection blow hollow molding machine as the defect rate characterization factor; Weighted sum the audio defect characterization factor and the defect rate characterization factor to obtain the defect characterization parameter.

[0013] Further, in the step S4, the step of adjusting the recording frequency of the operation data of the injection blow hollow molding machine includes: Comparing the defect characterization parameter with a preset defect characterization parameter comparison threshold; If the defect characterization parameter is greater than the preset defect characterization parameter comparison threshold, then adjust the recording frequency of the operation data of the injection blow hollow molding machine according to the defect characterization parameter, wherein the defect characterization parameter is positively correlated with the recording frequency of the operation data of the injection blow hollow molding machine.

[0014] Further, in the step S4, the step of determining whether to stop the machine includes: Comparing the defect characterization parameter with a preset shutdown comparison threshold; If the defect characterization parameter is greater than the preset shutdown comparison threshold, then determine to stop the operation of the injection blow hollow molding machine.

[0015] Further, in the step S4, the step of identifying whether the injection blow hollow molding machine is abnormal according to the current includes: Obtain the current of the injection blow hollow molding machine in real time; Obtain the fluctuation value of the current of the injection blow hollow molding machine every preset time, wherein the fluctuation of the current of the injection blow hollow molding machine is the difference between the maximum current value and the minimum current value within the preset time; Compare the fluctuation value of the current of the injection blow hollow molding machine with a preset current fluctuation value comparison threshold, and compare the current of the injection blow hollow molding machine with a preset power-off protection current value comparison threshold; If the first preset condition is satisfied, then identify that the injection blow hollow molding machine is abnormal; Wherein, the first preset condition is that the fluctuation value of the current of the injection blow hollow molding machine is greater than the preset current fluctuation value comparison threshold, or the current of the injection blow hollow molding machine is greater than the preset power-off protection current value comparison threshold.

[0016] Further, in the step S4, the step of determining whether to take power-off protection includes: If it is identified that the injection blow hollow molding machine is abnormal, then determine to take power-off protection.

[0017] Compared with the prior art, the present invention calculates the operation characterization parameters of the injection blow hollow molding machine according to the start-stop times within a preset time, the temperature of the heating barrel, and the continuous working duration of the heating barrel under the preset temperature condition, divides the working state of the injection blow hollow molding machine, and adopts corresponding power-off protection strategies, including calculating the defect characterization parameters, adjusting the recording frequency of the operation data of the injection blow hollow molding machine, and determining whether to stop the machine, or, obtaining the current of the injection blow hollow molding machine in real time, identifying whether the injection blow hollow molding machine is abnormal according to the current, and determining whether to adopt power-off protection. By monitoring the load condition of the injection blow hollow molding machine, the present invention can adopt corresponding power-off protection for the injection blow hollow molding machine in different operation states, thereby improving the reliability of power-off protection.

[0018] In particular, the present invention calculates the operation characterization parameters of the injection blow hollow molding machine according to the start-stop times, the temperature of the heating barrel, and the continuous working duration of the heating barrel under the preset temperature condition. The equipment being in a continuous high-temperature operation state for a long time or frequently starting and stopping is usually one of the indicators that the equipment is in a high-load operation state. Long-term high-load operation may cause the temperature of the equipment to rise. By monitoring the load condition of the injection blow hollow molding machine, the possibility of power-off of the injection blow hollow molding machine can be obtained. By calculating the operation characterization parameters of the injection blow hollow molding machine, the load condition of the injection blow hollow molding machine can be characterized to a certain extent, which helps to provide data support for subsequent analysis.

[0019] In particular, the present invention divides the working state of the injection blow hollow molding machine according to the operation characterization parameters of the injection blow hollow molding machine. In actual situations, the injection blow hollow molding machine may have a power-off due to its own operation abnormality or due to external factors. When the injection blow hollow molding machine is in a long-term high-load condition, it is more likely to have operation abnormalities. Therefore, by dividing the load state of the injection blow hollow molding machine through the operation characterization parameters of the injection blow hollow molding machine, corresponding power-off protection can be adopted for the injection blow hollow molding machine in different operation states, thereby improving the reliability of power-off protection.

[0020] In particular, the present invention calculates the defect characterization parameters according to the audio signal amplitude in combination with the product defect rate of the injection blow hollow molding machine. Since when the injection blow hollow molding machine is in high-load operation, the audio signal during the operation of the injection blow hollow molding machine and the product defect rate of the injection blow hollow molding machine can characterize the current operation condition of the injection blow hollow molding machine to a certain extent. When the audio signal amplitude of the injection blow hollow molding machine is large and the product defect rate of the injection blow hollow molding machine is large, it may be due to the abnormal operation of the injection blow hollow molding machine. Through the defect characterization parameters, it can be determined to a certain extent whether the current operation of the injection blow hollow molding machine is abnormal, so as to stop the operation of the injection blow hollow molding machine in time and prevent damage to the injection blow hollow molding machine equipment.

[0021] In particular, the present invention adjusts the recording frequency of the operating data of the injection blow hollow molding machine according to the defect characterization parameters and determines whether to stop the machine. During the operation of the injection blow hollow molding machine, the operating data of the injection blow hollow molding machine should be recorded. When the probability of abnormal operation of the injection blow hollow molding machine increases, the recording frequency of the operating data should be increased. On the one hand, the recorded operating data provides the historical operating conditions and performance data of the equipment. By analyzing the historical data, the stability of the subsequent operation of the injection blow hollow molding machine can be improved based on the recorded operating data. On the other hand, the recorded operating data records the production situation of the injection blow hollow molding machine, and the remaining production volume can be accurately obtained when resuming production. By adjusting the frequency of the recorded data, the protection of the injection blow hollow molding machine can be improved and its service life can be extended. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a flowchart of the power-off protection method for the injection blow hollow molding machine according to an embodiment of the invention; Figure 2 is a logical decision diagram for dividing the working states of the injection blow hollow molding machine according to an embodiment of the invention; Figure 3 is a logical decision diagram for determining whether to stop the machine according to an embodiment of the invention; Figure 4 is a logical decision diagram for identifying whether the injection blow hollow molding machine is abnormal according to an embodiment of the invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] In order to make the objectives and advantages of the present invention more clearly understood, the present invention will be further described below in conjunction with embodiments; it should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0024] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principles of the present invention and do not limit the protection scope of the present invention.

[0025] In addition, it should be noted that in the description of the present invention, unless otherwise clearly defined and limited, the term "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] Please refer to Figures 1 - 4 as shown in Figure 1 is a flowchart of the power-off protection method for the injection blow hollow molding machine according to an embodiment of the invention, Figure 2It is a logic decision diagram for the working state of an injection blow hollow molding machine in an invention embodiment. Figure 3 It is a logic decision diagram for determining whether to stop the machine in an invention embodiment. Figure 4 It is a logic decision diagram for identifying whether an injection blow hollow molding machine has an abnormality in an invention embodiment. The power-off protection method for the injection blow hollow molding machine of the present invention includes: Step S1: Obtain the start-stop times of the injection blow hollow molding machine within a preset time, obtain the temperature of the heating barrel according to a temperature sensor, and obtain the continuous working duration of the heating barrel under a preset temperature condition. Step S2: Calculate the operation characterization parameter of the injection blow hollow molding machine according to the start-stop times, the temperature of the heating barrel, and the continuous working duration of the heating barrel under the preset temperature condition. Step S3: Divide the working state of the injection blow hollow molding machine according to the operation characterization parameter of the injection blow hollow molding machine. Step S4: According to the working state of the injection blow hollow molding machine, adopt corresponding power-off protection strategies, including, Obtain the audio signal during the operation of the injection blow hollow molding machine according to an audio acquisition unit, and obtain the product image of the injection blow hollow molding machine according to an image acquisition unit, identify the product defect rate of the injection blow hollow molding machine, calculate the defect characterization parameter according to the audio signal amplitude combined with the product defect rate of the injection blow hollow molding machine, adjust the recording frequency of the operation data of the injection blow hollow molding machine, and determine whether to stop the machine. Or, obtain the current of the injection blow hollow molding machine in real time, identify whether the injection blow hollow molding machine has an abnormality according to the current, and determine whether to adopt power-off protection.

[0027] Specifically, the present invention does not limit the specific structure of the audio acquisition unit. The audio acquisition unit can be an audio acquisition system connected to a microphone, which is prior art and will not be elaborated here.

[0028] In this embodiment, obtain the start-stop times of the injection blow hollow molding machine within a preset time, where the preset duration is selected within the range of [1h, 2h].

[0029] In this embodiment, obtain the continuous working duration of the heating barrel under a preset temperature condition, where the preset temperature is determined by collecting the temperature of the heating barrel during the historical operation of the injection blow hollow molding machine. Specifically, determine the average temperature of the heating barrel during the historical operation, and determine the average temperature as the preset temperature. The preset temperature condition is that the temperature of the heating barrel is greater than the preset temperature.

[0030] Specifically, the specific structure of the injection blow hollow molding machine is not limited. Those skilled in the art can understand that the injection blow hollow molding machine includes an injection mechanism and a blow molding mechanism. Generally, the injection mechanism includes a heating barrel, a screw inside, and a nozzle. The heating barrel is a cylindrical structure with heating coils arranged outside. The screw rotates to push plastic particles, plasticize the plastic through shear friction and external heating, melt the plastic, and finally inject it into the injection mold through the injection nozzle to form a preform. The blow molding mechanism usually includes a blow molding mold and a blowing rod. The preform is placed in the blow molding mold, and the preform is inflated and fitted to the blow molding mold by blowing air through the blowing rod. This is the prior art and will not be elaborated here.

[0031] Specifically, in the step S2, the process of calculating the operation characterization parameters of the injection blow hollow molding machine includes calculating the ratio of the start-stop times within a preset time to the preset start-stop times threshold as the start-stop operation characterization factor; calculating the ratio of the temperature of the heating barrel to the preset heating barrel temperature threshold as the heating barrel operation characterization factor; calculating the ratio of the continuous working duration under the preset temperature condition to the preset continuous working duration threshold as the operation working duration characterization factor; weightedly summing the start-stop operation characterization factor, the heating barrel operation characterization factor, and the operation working duration characterization factor to obtain the operation characterization parameters of the injection blow hollow molding machine.

[0032] In this embodiment, the preset start-stop times threshold is the average value of the start-stop times within a number of historical preset times. The heating barrel temperature threshold is determined based on the preset temperature. To reflect the slightly higher temperature situation, the heating barrel temperature threshold is set to 1.15 times the preset temperature. The preset continuous working duration threshold is determined in advance. The average value of the continuous working duration under the preset temperature condition during several historical operation processes of the injection blow hollow molding machine is obtained, and the average value of the continuous working duration is set as the preset continuous working duration threshold.

[0033] When performing weighted summation, the weight for the start-stop operation characterization factor is 0.25, the weight for the heating barrel operation characterization factor is 0.45, and the weight for the operation working duration characterization factor is 0.3.

[0034] Specifically, the present invention calculates the operation characterization parameters of the injection blow hollow molding machine according to the start-stop times, the temperature of the heating barrel, and the duration of continuous operation of the heating barrel under the preset temperature condition. The equipment being in a continuous high-temperature operation state for a long time or frequently starting and stopping is usually one of the indicators that the equipment is in a high-load operation state. Long-term high-load operation may cause the temperature of the equipment to rise. By monitoring the load condition of the injection blow hollow molding machine, the possibility of power failure of the injection blow hollow molding machine can be obtained. By calculating the operation characterization parameters of the injection blow hollow molding machine, the load condition of the injection blow hollow molding machine can be characterized to a certain extent, which helps to provide data support for subsequent analysis.

[0035] Specifically, in the step S3, the steps of dividing the working state of the injection blow hollow molding machine according to the operation characterization parameters of the injection blow hollow molding machine include: Comparing the operation characterization parameters of the injection blow hollow molding machine with the preset comparison threshold of the operation characterization parameters of the injection blow hollow molding machine; If the operation characterization parameters of the injection blow hollow molding machine are greater than the preset comparison threshold of the operation characterization parameters of the injection blow hollow molding machine, the working state of the injection blow hollow molding machine is divided into a strong hidden danger working state; If the operation characterization parameters of the injection blow hollow molding machine are less than or equal to the preset comparison threshold of the operation characterization parameters of the injection blow hollow molding machine, the working state of the injection blow hollow molding machine is divided into a weak hidden danger working state.

[0036] In this embodiment, the preset comparison threshold of the operation characterization parameters of the injection blow hollow molding machine is selected within the range of [1.35, 1.5].

[0037] Specifically, the present invention divides the working state of the injection blow hollow molding machine according to the operation characterization parameters of the injection blow hollow molding machine. In actual situations, the injection blow hollow molding machine may have abnormal operation by itself, resulting in power failure, or power failure due to external factors. When the injection blow hollow molding machine is in a long-term high-load situation, it is more likely to have abnormal operation problems. Therefore, by dividing the load state of the injection blow hollow molding machine through the operation characterization parameters of the injection blow hollow molding machine, corresponding power failure protection can be taken for the injection blow hollow molding machine in different operation states, thereby improving the reliability of power failure protection.

[0038] Specifically, in the step S4, according to the working state of the injection blow hollow molding machine, a corresponding power failure protection strategy is adopted, where If the working state of the injection blow hollow molding machine is a high - risk working state, then obtain the audio signal during the operation of the injection blow hollow molding machine according to the audio acquisition unit, and obtain the product image of the injection blow hollow molding machine according to the image acquisition unit, identify the defective rate of the products of the injection blow hollow molding machine, calculate the defect characterization parameter according to the amplitude of the audio signal combined with the defective rate of the products of the injection blow hollow molding machine, adjust the recording frequency of the operation data of the injection blow hollow molding machine, and determine whether to stop the machine; If the working state of the injection blow hollow molding machine is a low - risk working state, then obtain the current of the injection blow hollow molding machine in real - time, identify whether the injection blow hollow molding machine has an abnormality according to the current, and determine whether to take power - off protection.

[0039] Specifically, in step S4, the steps of obtaining the product image of the injection blow hollow molding machine according to the image acquisition unit and identifying the defective rate of the products of the injection blow hollow molding machine include: Continuously obtain the product image of the injection blow hollow molding machine; Obtain the contours of each product of the injection blow hollow molding machine in the product image of the injection blow hollow molding machine; Determine whether the products of the injection blow hollow molding machine have defects according to the similarity between the contour of the product of the injection blow hollow molding machine and the preset comparison contour of the product of the injection blow hollow molding machine; Obtain the ratio of the number of defective products of the injection blow hollow molding machine to the total number of products of the injection blow hollow molding machine in the same batch as the defective rate of the products of the injection blow hollow molding machine; Among them, compare the similarity between the contour of the product of the injection blow hollow molding machine and the preset comparison contour of the product of the injection blow hollow molding machine with the preset similarity comparison threshold, If the similarity between the contour of the product of the injection blow hollow molding machine and the preset comparison contour of the product of the injection blow hollow molding machine is less than the preset similarity comparison threshold, then determine that the products of the injection blow hollow molding machine have defects.

[0040] Specifically, the present invention does not limit the specific methods for obtaining the contours of each product of the injection blow hollow molding machine in the product image and obtaining the similarity between the contour of the product of the injection blow hollow molding machine and the preset comparison contour of the product of the injection blow hollow molding machine. It can be through image - analysis software. Optionally, use MATLAB, which can identify the contour and make a similarity comparison. This is prior art and will not be elaborated further.

[0041] Specifically, the process of calculating the defect characterization parameter includes, Calculate the ratio of the amplitude of the audio signal during the operation of the injection blow hollow molding machine to the preset amplitude threshold as the audio defect characterization factor; Calculate the ratio of the defective rate of the products of the injection blow hollow molding machine to the preset defective - rate threshold of the products of the injection blow hollow molding machine as the defective - rate characterization factor; The audio defect characterization factor and the defect rate characterization factor are weighted and summed to obtain the defect characterization parameter.

[0042] In this embodiment, the preset amplitude threshold is measured in advance through experiments. The audio signal during the operation of the injection blow hollow molding machine is continuously acquired in advance, and the average amplitude of the audio signal is obtained. The preset amplitude threshold is set as the product of the average amplitude and the amplitude coefficient, and the amplitude coefficient is selected within the range of [1.3, 1.5]. The preset defect rate threshold of the injection blow hollow molding machine products is set in advance and is the average value of the historical defect rates of the injection blow hollow molding machine products.

[0043] In this embodiment, the weight for the audio defect characterization factor is 0.65, and the weight for the defect rate characterization factor is 0.35.

[0044] Specifically, the present invention calculates the defect characterization parameter according to the audio signal amplitude in combination with the defect rate of the injection blow hollow molding machine products. Since when the injection blow hollow molding machine operates at a high load, the audio signal during the operation of the injection blow hollow molding machine and the defect rate of the injection blow hollow molding machine products can characterize the current operation status of the injection blow hollow molding machine to a certain extent. When the amplitude of the audio signal of the injection blow hollow molding machine is large and the defect rate of the injection blow hollow molding machine products is large, it may be due to abnormal operation of the injection blow hollow molding machine. Through the defect characterization parameter, it can be determined to a certain extent whether the current injection blow hollow molding machine is operating abnormally, so as to stop the operation of the injection blow hollow molding machine in time and prevent damage to the injection blow hollow molding machine equipment.

[0045] Specifically, in step S4, the steps of adjusting the recording of the operation data of the injection blow hollow molding machine include: Comparing the defect characterization parameter with the preset defect characterization parameter comparison threshold; If the defect characterization parameter is greater than the preset defect characterization parameter comparison threshold, the recording frequency of the operation data of the injection blow hollow molding machine is adjusted according to the defect characterization parameter, where the defect characterization parameter and the recording frequency of the operation data of the injection blow hollow molding machine are in a positive correlation relationship.

[0046] In this embodiment, the preset defect characterization parameter comparison threshold D0 is selected within the range of [1.55, 1.60].

[0047] In this embodiment, optionally, When D0 < D < 1.1D0, the recording frequency fj1 of the operation data of the injection blow hollow molding machine = fj0 + △fj1; When 1.1D0 ≤ D, the recording frequency fj2 of the operation data of the injection blow hollow molding machine = fj0 + △fj2; fj0 is the initial recording frequency of the operating data of the injection blow hollow molding machine, △fj1 is the first recording frequency adjustment amount, △fj2 is the second recording frequency adjustment amount, 0.1fj0 < △fj1 < △fj2 < 0.3fj0, and fj0 is selected within the range of [10 times / h, 15 times / h].

[0048] Specifically, the present invention adjusts the recording frequency of the operating data of the injection blow hollow molding machine according to the defect characterization parameters and determines whether to stop the machine. During the operation of the injection blow hollow molding machine, the operating data of the injection blow hollow molding machine should be recorded. When the probability of possible abnormalities in the operation of the injection blow hollow molding machine increases, the recording frequency of the operating data should be increased. On the one hand, the recorded operating data provides the historical operating conditions and performance data of the equipment. Through the analysis of historical data, the stability of the subsequent operation of the injection blow hollow molding machine can be improved based on the recorded operating data. On the other hand, the recorded operating data records the production situation of the injection blow hollow molding machine, and the remaining production volume can be accurately obtained when resuming production. By adjusting the frequency of the recorded data, the protection of the injection blow hollow molding machine can be improved and its service life can be extended.

[0049] Specifically, in the step S4, the steps of determining whether to stop the machine include: Comparing the defect characterization parameter with a preset shutdown comparison threshold; If the defect characterization parameter is greater than the preset shutdown comparison threshold, it is determined to stop the operation of the injection blow hollow molding machine.

[0050] In this embodiment, the preset shutdown comparison threshold Dt = b × D0, where b is the shutdown coefficient and 1.2 < b < 1.3.

[0051] Specifically, in the step S4, the steps of identifying whether the injection blow hollow molding machine is abnormal according to the current include: Obtaining the current of the injection blow hollow molding machine in real time; Obtaining the fluctuation value of the current of the injection blow hollow molding machine every preset time, where the fluctuation of the current of the injection blow hollow molding machine is the difference between the maximum current value and the minimum current value within the preset time; Comparing the fluctuation value of the current of the injection blow hollow molding machine with a preset current fluctuation value comparison threshold, and comparing the current of the injection blow hollow molding machine with a preset power-off protection current value comparison threshold; If the first preset condition is satisfied, it is identified that the injection blow hollow molding machine is abnormal; Wherein, the first preset condition is that the fluctuation value of the current of the injection blow hollow molding machine is greater than the preset current fluctuation value comparison threshold, or the current of the injection blow hollow molding machine is greater than the preset power-off protection current value comparison threshold.

[0052] In this embodiment, the fluctuation value of the current of the injection blow hollow molding machine is obtained every preset time, and the preset time is selected within the range of [10 min, 20 min].

[0053] In this embodiment, the preset current fluctuation value comparison threshold Ib0 and the preset power-off protection current value comparison threshold I0 are measured in advance through experiments. The current value during the normal operation of the injection blow hollow molding machine is obtained in advance, and the current fluctuation value is obtained every preset time. The average current value Ie and the average current fluctuation value Ibe are calculated. Let Ib0 = c × Ibe, where c is the current fluctuation coefficient and 1.2 < c < 1.3. Let I0 = d × Ie, where d is the current coefficient and 1.1 < d < 1.3.

[0054] Specifically, in step S4, the steps for determining whether to take power-off protection include: If it is identified that the injection blow hollow molding machine is abnormal, it is determined to take power-off protection.

[0055] So far, the technical solution of the present invention has been described in conjunction with the preferred embodiments shown in the drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. A power-off protection method for an injection blow molding machine, characterized in that: include: Step S1, obtaining the number of starts and stops of the injection blow molding machine within a preset time, obtaining the temperature of the heating barrel according to the temperature sensor, and obtaining the continuous working time of the heating barrel under the preset temperature condition; Step S2, calculating the operation characteristic parameters of the injection blow molding machine according to the start and stop times, the heating barrel temperature, and the continuous working time of the heating barrel under the preset temperature conditions; Step S3, dividing the working state of the injection blow molding machine according to the operation characteristic parameters of the injection blow molding machine; Step S4, according to the working state of the injection blow molding machine, adopt a corresponding power-off protection strategy, including: Acquire an audio signal during the operation of the injection blow molding machine according to the audio acquisition unit, acquire an image of a product of the injection blow molding machine according to the image acquisition unit, identify the defect rate of the product of the injection blow molding machine, calculate a defect characterization parameter according to the amplitude of the audio signal combined with the defect rate of the product of the injection blow molding machine, adjust the recording frequency of the operation data of the injection blow molding machine, and determine whether to shut down the machine; Or, the current of the injection blow molding machine is obtained in real time, and whether the injection blow molding machine is abnormal is identified according to the current, and whether power-off protection is adopted.

2. The power-off protection method for the injection blow molding machine according to claim 1, characterized in that: In step S2, the process of calculating the operation characteristic parameters of the injection blow molding machine includes: The ratio of the number of starts and stops within a preset time to the preset start and stop number threshold is calculated as the start and stop operation characterization factor; Calculate the ratio of the heating barrel temperature to the preset heating barrel temperature threshold as the heating barrel operation characterization factor; The ratio of the continuous working time under the preset temperature condition to the preset continuous working time threshold is calculated as the operating working time characterization factor; The start-stop operation characterization factor, the heating barrel operation characterization factor and the operation working time characterization factor are weighted and summed to obtain the operation characterization parameter of the injection blow molding machine.

3. The power-off protection method for the injection blow molding machine according to claim 2, characterized in that: In the step S3, the step of dividing the working state of the injection blow molding machine according to the operation characteristic parameters of the injection blow molding machine includes: Comparing the injection blow molding machine operation characteristic parameter with a preset injection blow molding machine operation characteristic parameter comparison threshold; If the operation characteristic parameter of the injection blow molding machine is greater than the preset operation characteristic parameter comparison threshold of the injection blow molding machine, the working state of the injection blow molding machine is classified as a strong hidden danger working state; If the operation characterization parameter of the injection blow molding machine is less than or equal to the preset operation characterization parameter comparison threshold of the injection blow molding machine, the working state of the injection blow molding machine is classified as a weak hidden danger working state.

4. The power-off protection method for the injection blow molding machine according to claim 3, characterized in that: In step S4, a corresponding power-off protection strategy is adopted according to the working state of the injection blow molding machine, wherein: If the working state of the injection blow molding machine is a strong hidden danger working state, the audio signal of the injection blow molding machine during operation is obtained according to the audio acquisition unit, and the image of the injection blow molding machine product is obtained according to the image acquisition unit, the defect rate of the injection blow molding machine product is identified, and the defect characterization parameter is calculated according to the amplitude of the audio signal combined with the defect rate of the injection blow molding machine product, and the recording frequency of the injection blow molding machine operation data is adjusted and it is determined whether to shut down the machine; If the working state of the injection blow molding machine is a weak hidden danger working state, the current of the injection blow molding machine is obtained in real time, and whether the injection blow molding machine is abnormal is identified according to the current, and whether power-off protection is taken.

5. The power-off protection method for the injection blow molding machine according to claim 1, characterized in that: In step S4, the step of acquiring the image of the injection blow molding machine product according to the image acquisition unit and identifying the defect rate of the injection blow molding machine product includes: Continuously acquire images of injection blow molding machine products; Acquire the contour of each injection blow molding machine product in the injection blow molding machine product image; Determine whether the injection blow molding machine product has defects according to the similarity between the contour of the injection blow molding machine product and the preset comparison contour of the injection blow molding machine product; The ratio of the number of defective injection blow molding machine products to the total number of injection blow molding machine products in the same batch is obtained as the defect rate of injection blow molding machine products; The similarity between the contour of the injection blow molding machine product and the preset comparison contour of the injection blow molding machine product is compared with the preset similarity comparison threshold value. If the similarity between the contour of the injection blow molding machine product and the preset injection blow molding machine product comparison contour is less than a preset similarity comparison threshold, it is determined that the injection blow molding machine product has defects.

6. The power-off protection method for the injection blow molding machine according to claim 5, characterized in that: In step S4, the process of calculating the defect characterization parameters includes: Calculate the ratio of the amplitude of the audio signal during the operation of the injection blow molding machine to the preset amplitude threshold as the audio defect characterization factor; The ratio of the defect rate of the injection blow molding machine product to the preset threshold value of the defect rate of the injection blow molding machine product is calculated as the defect rate characterization factor; The audio defect characterization factor and the defect rate characterization factor are weighted and summed to obtain the defect characterization parameter.

7. The power-off protection method for an injection blow molding machine according to claim 1, characterized in that: In the step S4, the step of adjusting the recording frequency of the operation data of the injection blow molding machine includes: Comparing the defect characterization parameter with a preset defect characterization parameter comparison threshold; If the defect characterization parameter is greater than a preset defect characterization parameter comparison threshold, the recording frequency of the injection blow molding machine operation data is adjusted according to the defect characterization parameter, wherein the defect characterization parameter is positively correlated with the recording frequency of the injection blow molding machine operation data.

8. The power-off protection method for an injection blow molding machine according to claim 1, characterized in that: In step S4, the step of determining whether to shut down includes: comparing the defect characterization parameter with a preset shutdown comparison threshold; If the defect characterization parameter is greater than the preset shutdown comparison threshold, it is determined to stop the injection blow molding machine.

9. The power-off protection method for the injection blow molding machine according to claim 8, characterized in that: In step S4, the step of identifying whether the injection blow molding machine is abnormal according to the current includes: Get the current of the injection blow molding machine in real time; Obtaining a current fluctuation value of the injection blow molding machine at preset intervals, wherein the current fluctuation of the injection blow molding machine is a difference between a maximum current value and a minimum current value within a preset time; Compare the current fluctuation value of the injection blow molding machine with a preset current fluctuation value comparison threshold, and compare the current of the injection blow molding machine with a preset power-off protection current value comparison threshold; If the first preset condition is met, it is identified that the injection blow molding machine is abnormal; Among them, the first preset condition is that the fluctuation value of the injection blow molding machine current is greater than the preset current fluctuation value comparison threshold, or the current of the injection blow molding machine is greater than the preset power-off protection current value comparison threshold.

10. The power-off protection method for an injection blow molding machine according to claim 1, characterized in that: In step S4, the step of determining whether to adopt power-off protection includes: If an abnormality is detected in the injection blow molding machine, it is determined that power-off protection is taken.

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