A power-off protection method for an injection blow hollow molding machine

Abstract

The present invention relates to the technical field of injection blow hollow molding machines, and particularly to a power-off protection method for an injection blow hollow molding machine. The present invention calculates the operation characterization parameters of the injection blow hollow molding machine according to the start-stop times of the injection blow hollow molding machine 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 states 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. The present invention monitors the load condition of the injection blow hollow molding machine, so that corresponding power-off protection can be adopted for the injection blow hollow molding machine in different operating states, and the reliability of the 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, including 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 to the outer wall of the injection-blow hollow molding assembly, and an adjustable conveying and discharging structure is also fixed to 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, there are still the following problems in the prior art.

[0006] 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 of the injection-blow hollow molding machine and sudden power-off during operation. 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

[0007] 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 of the injection-blow hollow molding machine and sudden power-off during operation, 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.

[0008] To achieve the above object, the present invention provides a power-off protection method for an injection blow hollow molding machine, which includes:

[0009] 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;

[0010] 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 a preset temperature condition;

[0011] 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;

[0012] Step S4, adopting a corresponding power-off protection strategy according to the working state of the injection blow hollow molding machine, including,

[0013] 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 defective rate of the products of the injection blow hollow molding machine, calculating a defect characterization parameter according to the amplitude of the audio signal in combination with the defective rate of the products 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;

[0014] 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.

[0015] Further, the process of calculating the operation characterization parameter of the injection blow hollow molding machine includes,

[0016] calculating the ratio of the start-stop times within a preset time to a preset start-stop times threshold as a start-stop operation characterization factor;

[0017] calculating the ratio of the temperature of the heating barrel to a preset heating barrel temperature threshold as a heating barrel operation characterization factor;

[0018] calculating the ratio of the continuous working duration under a preset temperature condition to a preset continuous working duration threshold as an operation working duration characterization factor;

[0019] 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 parameter of the injection blow hollow molding machine.

[0020] 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:

[0021] Compare the operating characterization parameters of the injection blow hollow molding machine with the comparison threshold of the preset operating characterization parameters of the injection blow hollow molding machine;

[0022] If the operating characterization parameters of the injection blow hollow molding machine are greater than the comparison threshold of the preset operating characterization parameters of the injection blow hollow molding machine, classify the working state of the injection blow hollow molding machine as a strong hidden danger working state;

[0023] If the operating characterization parameters of the injection blow hollow molding machine are less than or equal to the comparison threshold of the preset operating characterization parameters of the injection blow hollow molding machine, classify the working state of the injection blow hollow molding machine as a weak hidden danger working state.

[0024] Further, in step S4, according to the working state of the injection blow hollow molding machine, adopt a corresponding power-off protection strategy, where,

[0025] If the working state of the injection blow hollow molding machine is a strong hidden danger working state, 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 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;

[0026] If the working state of the injection blow hollow molding machine is a weak hidden danger working state, 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] Further, 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 product defect rate of the injection blow hollow molding machine include:

[0028] Continuously obtain the product image of the injection blow hollow molding machine;

[0029] Obtain the contours of each product of the injection blow hollow molding machine in the product image of the injection blow hollow molding machine;

[0030] Determine whether there are defects in the products of the injection blow hollow molding machine 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;

[0031] 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 product defect rate of the injection blow hollow molding machine;

[0032] Among them, compare 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 with the preset similarity comparison threshold,

[0033] If the similarity between the profile of the product of the injection blow hollow molding machine and the preset comparison profile of the product of the injection blow hollow molding machine is less than the preset similarity comparison threshold, it is determined that the product of the injection blow hollow molding machine is defective.

[0034] Further, the process of calculating the defect characterization parameter includes,

[0035] Calculating 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;

[0036] Calculating the ratio of the defect rate of the product of the injection blow hollow molding machine to the preset defect rate threshold of the product of the injection blow hollow molding machine as the defect rate characterization factor;

[0037] Weighted summing the audio defect characterization factor and the defect rate characterization factor to obtain the defect characterization parameter.

[0038] Further, in the step S4, the step of adjusting the recording frequency of the operation data of the injection blow hollow molding machine includes:

[0039] Comparing the defect characterization parameter with the preset defect characterization parameter comparison threshold;

[0040] 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, wherein the defect characterization parameter and the recording frequency of the operation data of the injection blow hollow molding machine are in a positive correlation.

[0041] Further, in the step S4, the step of determining whether to stop the machine includes:

[0042] Comparing the defect characterization parameter with the preset shutdown comparison threshold;

[0043] 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.

[0044] Further, in the step S4, the step of identifying whether the injection blow hollow molding machine is abnormal according to the current includes:

[0045] Obtaining the current of the injection blow hollow molding machine in real time;

[0046] Obtaining 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;

[0047] Comparing the fluctuation value of the current of the injection blow hollow molding machine with the preset current fluctuation value comparison threshold, and comparing the current of the injection blow hollow molding machine with the preset power-off protection current value comparison threshold;

[0048] If the first preset condition is met, it is recognized that the injection blow hollow molding machine has an abnormality;

[0049] Among them, 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.

[0050] Further, in the step S4, the steps of determining whether to take power-off protection include:

[0051] If it is recognized that the injection blow hollow molding machine has an abnormality, it is determined to take power-off protection.

[0052] Compared with the prior art, the present invention calculates the operation characterization parameter of the injection blow hollow molding machine according to the start-stop times of the injection blow hollow molding machine 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 parameter, adjusting the recording frequency of the operation data of the injection blow hollow molding machine, and determining whether to stop the machine, or, in real time, obtaining the current of the injection blow hollow molding machine, identifying whether the injection blow hollow molding machine has an abnormality according to the current, and determining whether to take power-off protection. The present invention monitors the load condition of the injection blow hollow molding machine, so as to take corresponding power-off protection for the injection blow hollow molding machine in different operating states, and improve the reliability of power-off protection.

[0053] In particular, the present invention calculates 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. 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 parameter 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.

[0054] In particular, the present invention divides the working state of the injection blow hollow molding machine according to the operation characterization parameter of the injection blow hollow molding machine. In actual situations, the injection blow hollow molding machine may have an abnormality in its own operation, resulting in a power-off, or a power-off 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 an abnormal operation problem. Therefore, by dividing the load state of the injection blow hollow molding machine through the operation characterization parameter of the injection blow hollow molding machine, corresponding power-off protection can be taken for the injection blow hollow molding machine in different operating states, and the reliability of power-off protection can be improved.

[0055] In particular, the present invention calculates a defect characterization parameter based on the amplitude of the audio signal in combination with the defect rate of the injection blow hollow molding machine products. Since when the injection blow hollow molding machine is operating under 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 to a certain extent characterize the current operating condition of the injection blow hollow molding machine. When the amplitude of the audio signal of the injection blow hollow molding machine and the defect rate of the injection blow hollow molding machine products are relatively large, it may be due to abnormal operation of the injection blow hollow molding machine. Through the defect characterization parameter, it is possible to obtain 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 equipment of the injection blow hollow molding machine.

[0056] In particular, the present invention adjusts the recording frequency of the operating data of the injection blow hollow molding machine and determines whether to stop the machine according to the defect characterization parameter. 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 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 according to 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

[0057] 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;

[0058] Figure 2 is a logical decision diagram for dividing the working state of the injection blow hollow molding machine according to an embodiment of the invention;

[0059] Figure 3 is a logical decision diagram for determining whether to stop the machine according to an embodiment of the invention;

[0060] 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

[0061] In order to make the objectives and advantages of the present invention clearer, 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.

[0062] 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 principle of the present invention and do not limit the protection scope of the present invention.

[0063] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and defined, 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 components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0064] Please refer to Figures 1 - 4 as shown in Figure 1 the flowchart of the power-off protection method for the injection blow hollow molding machine in the embodiment of the invention, Figure 2 the logical determination diagram for dividing the working states of the injection blow hollow molding machine in the embodiment of the invention, Figure 3 the logical determination diagram for determining whether to stop the machine in the embodiment of the invention, Figure 4 the logical determination diagram for identifying whether there is an abnormality in the injection blow hollow molding machine in the embodiment of the invention. The power-off protection method for the injection blow hollow molding machine of the present invention includes:

[0065] 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 the temperature sensor, and obtain the continuous working duration of the heating barrel under the preset temperature condition;

[0066] 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;

[0067] Step S3, divide the working states of the injection blow hollow molding machine according to the operation characterization parameter of the injection blow hollow molding machine;

[0068] Step S4, according to the working states of the injection blow hollow molding machine, adopt corresponding power-off protection strategies, including,

[0069] 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 defect 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 defect 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;

[0070] Or, obtain the current of the injection blow hollow molding machine in real time, identify whether there is an abnormality in the injection blow hollow molding machine according to the current, and determine whether to adopt power-off protection.

[0071] Specifically, the present invention does not limit the specific structure of the audio acquisition unit. The audio acquisition unit may be an audio acquisition system connected to a microphone, which is prior art and will not be elaborated herein.

[0072] In this embodiment, the number of start-stop times of the injection blow molding machine within a preset time is obtained, where the preset duration is selected within the range of [1 h, 2 h].

[0073] In this embodiment, the continuous working duration of the heating barrel under preset temperature conditions is obtained, where the preset temperature is determined by collecting the temperature of the heating barrel during the historical operation of the injection blow molding machine. Specifically, the average temperature of the heating barrel during the historical operation is determined, and the average temperature is determined as the preset temperature. The preset temperature condition is that the temperature of the heating barrel is greater than the preset temperature.

[0074] Specifically, the specific structure of the injection blow molding machine is not limited. Those skilled in the art can understand that the injection blow molding machine includes an injection mechanism and a blow molding mechanism. The injection mechanism generally includes a heating barrel, a screw inside, and a nozzle. The heating barrel is a cylindrical structure with a heating coil externally configured. 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.

[0075] 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 to fit the blow molding mold by blowing through the blowing rod. This is prior art and will not be elaborated herein.

[0076] Specifically, in step S2, the process of calculating the operation characterization parameter of the injection blow molding machine includes

[0077] Calculating the ratio of the number of start-stop times within the preset time to the preset start-stop times threshold as the start-stop operation characterization factor;

[0078] Calculating the ratio of the temperature of the heating barrel to the preset heating barrel temperature threshold as the heating barrel operation characterization factor;

[0079] 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;

[0080] 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 parameter of the injection blow molding machine.

[0081] In this embodiment, the preset start-stop times threshold is the average of the start-stop times within a number of preset times in history. The heating barrel temperature threshold is determined based on a preset temperature. To reflect a 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. During several historical operations of the injection blow hollow molding machine, the average continuous working duration under the preset temperature condition is obtained, and the average continuous working duration is set as the preset continuous working duration threshold.

[0082] 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.

[0083] Specifically, the present invention calculates the operation characterization parameter of the injection blow hollow molding machine based on the start-stop times, the heating barrel temperature, 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 equipment temperature to rise. By monitoring the load situation 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 parameter of the injection blow hollow molding machine, the load situation of the injection blow hollow molding machine can be characterized to a certain extent, which helps to provide data support for subsequent analysis.

[0084] Specifically, in the step S3, the steps 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 include:

[0085] Comparing the operation characterization parameter of the injection blow hollow molding machine with the preset comparison threshold of the operation characterization parameter of the injection blow hollow molding machine;

[0086] 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, then divide the working state of the injection blow hollow molding machine into a strong hidden danger working state;

[0087] If the operation characterization parameter of the injection blow hollow molding machine is less than or equal to the preset comparison threshold of the operation characterization parameter of the injection blow hollow molding machine, then divide the working state of the injection blow hollow molding machine into a weak hidden danger working state.

[0088] In this embodiment, the preset comparison threshold of the operation characterization parameter of the injection blow hollow molding machine is selected within the range of [1.35, 1.5].

[0089] Specifically, the present invention divides the working states of the injection blow hollow molding machine according to the operating characterization parameters of the injection blow hollow molding machine. In actual situations, the injection blow hollow molding machine may experience abnormalities in its own operation, power outages, or power outages 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 problems with abnormal operation. Therefore, the load state of the injection blow hollow molding machine is divided according to the operating characterization parameters of the injection blow hollow molding machine, so that corresponding power-off protection can be taken for the injection blow hollow molding machine in different operating states, improving the reliability of power-off protection.

[0090] Specifically, in step S4, according to the working state of the injection blow hollow molding machine, a corresponding power-off protection strategy is adopted, where

[0091] if the working state of the injection blow hollow molding machine is a strong hidden danger working state, then the audio signal during the operation of the injection blow hollow molding machine is obtained according to the audio acquisition unit, and the product image of the injection blow hollow molding machine is obtained according to the image acquisition unit, the defect rate of the products of the injection blow hollow molding machine is identified, the defect characterization parameter is calculated according to the amplitude of the audio signal combined with the defect rate of the products of the injection blow hollow molding machine, 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;

[0092] 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 obtained in real time, and it is identified whether the injection blow hollow molding machine has an abnormality according to the current, and it is determined whether to adopt power-off protection.

[0093] Specifically, in step S4, the steps of obtaining the product image of the injection blow hollow molding machine by the image acquisition unit and identifying the defect rate of the products of the injection blow hollow molding machine include:

[0094] Continuously obtain the product image of the injection blow hollow molding machine;

[0095] Obtain the contours of each product of the injection blow hollow molding machine in the product image of the injection blow hollow molding machine;

[0096] Determine whether there are defects in the products of the injection blow hollow molding machine 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;

[0097] 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;

[0098] Among them, 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 compared with the preset similarity comparison threshold,

[0099] If the similarity between the profile of the injection blow hollow molded product and the comparison profile of the preset injection blow hollow molded product is less than the preset similarity comparison threshold, it is determined that the injection blow hollow molded product is defective.

[0100] Specifically, the present invention does not limit the specific method for obtaining the profile of each injection blow hollow molded product in the image of the injection blow hollow molded product and obtaining the similarity between the profile of the injection blow hollow molded product and the comparison profile of the preset injection blow hollow molded product. It can be through image analysis software. Optionally, MATLAB can be used, which can identify the profile and make a similarity comparison. This is the prior art and will not be elaborated.

[0101] Specifically, the process of calculating the defect characterization parameter includes,

[0102] Calculating 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;

[0103] Calculating the ratio of the defect rate of the injection blow hollow molded product to the preset defect rate threshold of the injection blow hollow molded product as the defect rate characterization factor;

[0104] Weighted summing the audio defect characterization factor and the defect rate characterization factor to obtain the defect characterization parameter.

[0105] In this embodiment, the preset amplitude threshold is measured in advance through experiments. Continuously obtain the audio signal during the operation of the injection blow hollow molding machine in advance, obtain the average amplitude of the audio signal, and set the preset amplitude threshold as the product of the average amplitude and the amplitude coefficient. The amplitude coefficient is selected within the interval [1.3, 1.5]. The preset defect rate threshold of the injection blow hollow molded product is set in advance and is the mean value of the historical defect rates of the injection blow hollow molded products.

[0106] 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.

[0107] Specifically, the present invention calculates the defect characterization parameter based on the audio signal amplitude in combination with the defect rate of the injection blow hollow molded product. Since when the injection blow hollow molding machine is operating at high load, the audio signal during the operation of the injection blow hollow molding machine and the defect rate of the injection blow hollow molded product can to a certain extent characterize the current operating condition of the injection blow hollow molding machine. 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 molded product is large, it may be due to abnormal operation of the injection blow hollow molding machine. Through the defect characterization parameter, it is possible to obtain 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.

[0108] Specifically, in step S4, the steps of adjusting the recording of the operation data of the injection blow hollow molding machine include:

[0109] Comparing the defect characterization parameter with a preset defect characterization parameter comparison threshold;

[0110] If the defect characterization parameter is greater than the preset defect characterization parameter comparison threshold, adjust the recording frequency of the operation data of the injection blow hollow molding machine according to the defect characterization parameter, wherein there is a positive correlation between the defect characterization parameter and the recording frequency of the operation data of the injection blow hollow molding machine.

[0111] In this embodiment, the preset defect characterization parameter comparison threshold D0 is selected within the range of [1.55, 1.60].

[0112] In this embodiment, optionally,

[0113] When D0 < D < 1.1D0, the recording frequency fj1 of the operation data of the injection blow hollow molding machine = fj0 + △fj1;

[0114] When 1.1D0 ≤ D, the recording frequency fj2 of the operation data of the injection blow hollow molding machine = fj0 + △fj2;

[0115] fj0 is the initial recording frequency of the operation 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].

[0116] Specifically, the present invention adjusts the recording frequency of the operation data of the injection blow hollow molding machine according to the defect characterization parameter and determines whether to stop the machine. During the operation of the injection blow hollow molding machine, the operation data of the injection blow hollow molding machine should be recorded. When the probability that the operation of the injection blow hollow molding machine may be abnormal increases, the recording frequency of the operation data should be increased. On the one hand, the recorded operation data provides the historical operation situation and performance data of the equipment. Through the analysis of the historical data, the stability of the subsequent operation of the injection blow hollow molding machine can be improved according to the recorded operation data. On the other hand, the recorded operation data records the production situation of the injection blow hollow molding machine. When resuming production, the remaining production volume can be accurately obtained. By adjusting the frequency of the recorded data, the protection of the injection blow hollow molding machine can be improved and the service life can be extended.

[0117] Specifically, in step S4, the steps of determining whether to stop the machine include:

[0118] Comparing the defect characterization parameter with a preset shutdown comparison threshold;

[0119] 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.

[0120] In this embodiment, the preset shutdown comparison threshold Dt = b×D0, where b is the shutdown coefficient and 1.2 < b < 1.3.

[0121] Specifically, in the step S4, the steps of identifying whether the injection blow hollow molding machine is abnormal according to the current include:

[0122] Obtain the current of the injection blow hollow molding machine in real time;

[0123] Obtain 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;

[0124] Compare the fluctuation value of the current of the injection blow hollow molding machine with the preset current fluctuation value comparison threshold, and compare the current of the injection blow hollow molding machine with the preset power-off protection current value comparison threshold;

[0125] If the first preset condition is satisfied, it is identified that the injection blow hollow molding machine is abnormal;

[0126] Among them, 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.

[0127] 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].

[0128] 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 by 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.

[0129] Specifically, in the step S4, the steps of determining whether to take power-off protection include:

[0130] If it is identified that the injection blow hollow molding machine is abnormal, it is determined to take power-off protection.

[0131] So far, the technical solution of the present invention has been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easily understood by those skilled in the art 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 hollow molding machine, characterized in that, Including: 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 the temperature sensor, and obtain the continuous working duration of the heating barrel under the 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 If the working state of the injection blow hollow molding machine is a strong hidden danger working state, 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 defect 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 defect 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 weak hidden danger working state, 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; In the said Step S2, 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; Performing a weighted sum of 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; The steps 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 include: Comparing the operation characterization parameter of the injection blow hollow molding machine with the 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, divide the working state of the injection blow hollow molding machine into a strong hidden danger working state; If the operation characterization parameter of the injection blow hollow molding machine is less than or equal to the preset comparison threshold of the operation characterization parameter of the injection blow hollow molding machine, divide the working state of the injection blow hollow molding machine into a weak hidden danger working state.

2. The power-off protection method of the injection blow hollow molding machine according to claim 1, characterized in that, In the said 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 defect rate of the products of the injection blow hollow molding machine include: Continuously obtaining the product image of the injection blow hollow molding machine; Obtaining the contours of each product of the injection blow hollow molding machine in the product image of the injection blow hollow molding machine; Determining whether there are defects in the products of the injection blow hollow molding machine 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; Obtaining 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 profile of the injection blow hollow molding product and the comparison profile of the preset injection blow hollow molding product is compared with the preset similarity comparison threshold. If the similarity between the profile of the injection blow hollow molding product and the comparison profile of the preset injection blow hollow molding product is less than the preset similarity comparison threshold, it is determined that the injection blow hollow molding product has defects.

3. The power-off protection method of the injection blow hollow molding machine according to claim 2, characterized in that, In the step S4, the process of calculating the defect characterization parameter includes calculating 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; calculating the ratio of the defect rate of the injection blow hollow molding product to the preset defect rate threshold of the injection blow hollow molding product as the defect rate characterization factor; weighted summing the audio defect characterization factor and the defect rate characterization factor to obtain the defect characterization parameter.

4. The power-off protection method of the injection blow hollow 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 hollow molding machine includes: 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 is positively correlated with the recording frequency of the operation data of the injection blow hollow molding machine.

5. The power-off protection method of the injection blow hollow molding machine according to claim 1, characterized in that, In the step S4, the step of determining whether to stop the machine includes: comparing the defect characterization parameter with the 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.

6. The power-off protection method of the injection blow hollow molding machine according to claim 5, characterized in that, In the step S4, the step of identifying whether the injection blow hollow molding machine is abnormal according to the current includes: 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 the preset current fluctuation value comparison threshold, and comparing the current of the injection blow hollow molding machine with the 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.

7. The power-off protection method of the injection blow hollow molding machine according to claim 1, characterized in that, 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, it is determined to take power-off protection.

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