Monitoring method and monitoring equipment for injection molding machine

Abstract

The invention discloses a monitoring method and monitoring equipment for an injection molding machine, and the monitoring method for the injection molding machine comprises the steps: determining whether a cooling link of a mold in a cavity is completed or not; if yes, mold data of the mold part right opposite to each detection cavity wall and temperature data and pressure data fed back by each detection cavity wall are obtained; according to the mold data, the temperature data and the pressure data corresponding to each detection cavity wall, whether the mold part directly facing each detection cavity wall is completely cooled or not is determined; and if it is determined that the mold part right opposite to any detection cavity wall is not completely cooled, the cooling link is executed again. According to the technical scheme, the yield of injection molds produced by the injection molding machine and the subsequent mold machining efficiency can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of injection molding machines, and in particular to an injection molding machine monitoring method and monitoring equipment. Background Art

[0002] For molds that use injection molding, the mold usually needs to be cooled after injection molding is completed before it can be demolded by contact demolding components such as robotic arms and suction nozzles, and then transferred to the back end through a conveyor belt for further processing or assembly. However, if an incompletely formed mold is encountered, the production yield of the injection mold and the processing efficiency of subsequent processing links will be low. Summary of the invention

[0003] The main purpose of the present invention is to provide an injection molding machine monitoring method and monitoring equipment, which aims to solve the problem that the incompletely formed molds produced by the injection molding machine lead to low production yield of the injection molds and low processing efficiency in subsequent processing links. To achieve the above object, the present invention proposes an injection molding machine monitoring method and monitoring equipment, wherein a cavity is formed in the injection molding machine, the cavity is used for injection molding, the cavity wall of the cavity includes a plurality of detection cavity walls, and the injection molding machine monitoring method includes: Determining whether the cooling process of the mold in the cavity is completed; If completed, then the mold data of the mold part facing each detection cavity wall, as well as the temperature data and pressure data fed back by each detection cavity wall are obtained; Determine whether the mold portion facing each detection cavity wall is completely cooled according to the mold data, temperature data and pressure data corresponding to each detection cavity wall; If it is determined that the mold portion facing any of the detection cavity walls is not completely cooled, the cooling step is performed again.

[0004] Optionally, the obtaining of mold data of each mold portion that the detection cavity wall faces includes: Acquire the position data of each detection cavity wall in the cavity and the area data of each detection cavity wall; Acquiring model data of the mold; Determine a mapping portion of each detection cavity wall on the mold according to the model data and the position data and area data of each detection cavity wall; According to the model data and the mapping part of each detection cavity wall, the model thickness data of each mapping part is determined to serve as the mold data of the mold part that the corresponding detection cavity wall faces.

[0005] Optionally, determining whether a mold portion facing each detection cavity wall is completely cooled according to the mold data, temperature data and pressure data corresponding to each detection cavity wall includes: Taking the initial value of the temperature data fed back by the detection cavity wall as the initial temperature of the detection cavity wall; Calculating the temperature rise law of each detection cavity wall according to the temperature data of the detection cavity wall, and calculating the pressure rise parameter of each detection cavity wall according to the pressure data of each detection cavity wall; Determining whether the temperature rise parameter and the pressure rise parameter of the detection cavity wall meet the preset standard matching the initial temperature and the model thickness data; If the preset standard is reached, it is determined that the mold portion facing the detection cavity wall is not completely cooled; If the preset standard is not reached, it is determined that the mold portion facing the detection cavity wall is not completely cooled.

[0006] Optionally, the preset standard includes a preset temperature rise standard and a preset pressure rise standard; Before determining whether the temperature rise parameter and the pressure rise parameter of the detection cavity wall reach a preset standard matching the initial temperature and the model thickness data, the method further includes: According to the initial temperature value of the detection cavity wall and the model thickness data of the opposite mold part, the first preset temperature rise parameter of the detection cavity wall is determined as the preset temperature rise standard, and the preset pressure rise parameter of the detection cavity wall is determined as the preset pressure rise standard.

[0007] Optionally, determining whether the temperature rise parameter and the pressure rise parameter of the detection cavity wall meet preset standards matching the initial temperature and model thickness data includes: determining whether the pressure rise parameter reaches a preset pressure rise standard before the temperature data reaches a first preset temperature; If the preset pressure rise standard is reached, then after the temperature data reaches the first preset temperature, continue to determine whether the temperature rise parameter reaches the preset temperature rise standard; If the preset temperature rise standard is reached, determining that the temperature rise parameter and the pressure rise parameter of the detection cavity wall reach the preset standard matching the initial temperature and the model thickness data; If the pressure rise parameter does not reach the preset pressure rise standard before the temperature data reaches the first preset temperature, or if it is determined that the temperature rise parameter does not reach the preset temperature rise standard after the temperature data reaches the first preset temperature, it is determined that the temperature rise parameter and the pressure rise parameter of the detection cavity wall do not reach the preset standard matching the initial temperature and model thickness data.

[0008] Optionally, before the step of determining whether the pressure rise parameter reaches a preset pressure rise standard before the temperature data reaches a first preset temperature, the method further comprises: Determining whether the temperature data reaches a second preset temperature; If the second preset temperature is reached, then executing the step of determining whether the pressure rise parameter reaches a preset pressure rise standard before the temperature data reaches the first preset temperature; Wherein, the second preset temperature is lower than the first preset temperature.

[0009] Optionally, the pressure rise parameter includes a pressure data rise rate and a pressure data rise acceleration; The temperature rise parameters include a temperature data rise rate and a temperature data rise acceleration.

[0010] Optionally, each of the detection cavity walls is configured to be movable toward the mold; Before the step of determining whether the mold portion facing each detection cavity wall is completely cooled according to the mold data, temperature data and pressure data corresponding to each detection cavity wall, the method further includes: Determining whether each of the detection cavity walls is in contact with the mold according to the pressure data fed back by each of the detection cavity walls; If it is determined that all the detection cavity walls are in contact with the mold, then performing the step of determining whether the mold portion facing each detection cavity wall is completely cooled according to the mold data, temperature data and pressure data corresponding to each detection cavity wall; If it is determined that any one of the detection cavity walls is not in contact with the mold, the detection cavity wall is controlled to move toward the mold until it contacts with the mold and then stops moving.

[0011] Optionally, the number of the detection cavity walls is 2N, wherein N of the detection cavity walls are arranged opposite to the remaining N of the detection cavity walls one by one; Said N is a positive integer.

[0012] The present invention further proposes a monitoring device, which is applied to an injection molding machine, wherein a cavity is formed in the injection molding machine, the cavity is used for an injection molding mold, and the cavity wall of the cavity includes a plurality of detection cavity walls. The monitoring device includes: memory; and, A processor, an injection molding machine monitoring program stored in the memory and executed by the processor, and the injection molding machine monitoring method, when executed by the processor, implements the injection molding machine monitoring method as described above.

[0013] The technical solution of the present invention adopts a method to determine whether the cooling link of the mold in the cavity is completed; if completed, the mold data of the mold part facing each detection cavity wall, as well as the temperature data and pressure data fed back by each detection cavity wall are obtained; according to the mold data, temperature data and pressure data corresponding to each detection cavity wall, it is determined whether the mold part facing each detection cavity wall is completely cooled; if it is determined that the mold part facing any detection cavity wall is not completely cooled, the cooling link is executed again. In this way, after two cooling moldings, the content of high-temperature liquid injection molding materials in the incompletely cooled mold can be greatly reduced or even eliminated, and the mold morphology stability of the final injection molding is greatly improved, thereby improving the yield of the injection mold produced by the injection molding machine and the processing efficiency of the subsequent processing links. In addition, the technical solution of the present invention can determine the mold that is not completely cooled without opening the cavity, and after determining that there is an incompletely cooled mold, the secondary cooling of the mold can be completed by utilizing the cavity structure and cooling system of the injection molding machine, that is, the secondary cooling process occurs in the cavity, and there will be no deformation of the mold caused by the secondary cooling process. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0015] Figure 1 A schematic diagram of a flow chart of an embodiment of a method for monitoring an injection molding machine according to the present invention; Figure 2 A schematic flow chart of another embodiment of a method for monitoring an injection molding machine according to the present invention; Figure 3 The figure is a schematic structural diagram of an embodiment of a monitoring device of the present invention.

[0016] Description of Figure Numbers: Label name Label name Memory 11 Communication Bus 13 processor 12 The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] In addition, in the present invention, descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0019] In the injection molding process, due to various reasons such as insufficient coolant temperature or excessive thickness of part of the mold shell, incompletely cooled molds often appear. The characteristic of incompletely cooled molds is that there is still injection molding materials in a high-temperature liquid state inside some of them. For this type of mold, since it has just gone through the cooling stage, its outer surface can temporarily maintain a formed solid state, allowing the mold to be successfully taken and placed on the conveyor belt by demolding components such as robots and suction cups for transmission. As time goes by, the high-temperature injection molding materials inside will gradually cool down by themselves, but since they have been out of the limitations of the cavity at this time, the mold will usually be deformed during the self-cooling process, and this deformed mold is often not discovered until the later processing stages, which greatly affects the efficiency of the subsequent processing stages of the injection mold.

[0020] Although factories now add infrared cameras in the subsequent mold processing links, and use infrared cameras to judge abnormally high temperatures to screen out molds that have not been completely cooled, this method can only detect molds that have not been completely cooled in advance, and it cannot actually reduce the production of molds that have not been completely cooled, and does not have a very high impact on the yield rate of injection molds.

[0021] In view of the above problems, the present invention proposes an injection molding machine monitoring method, which is applied to an injection molding machine. A cavity is formed in the injection molding machine. The cavity is used for an injection molding mold. The cavity wall of the cavity includes multiple detection cavity walls.

[0022] Reference Figure 1 , the injection molding machine monitoring method comprises: S100: Determine whether the cooling process of the mold in the cavity is completed; S200: If completed, then obtaining mold data of the mold portion facing each of the detection cavity walls, as well as temperature data and pressure data fed back by each of the detection cavity walls; S300: determining whether a mold portion facing each detection cavity wall is completely cooled according to the mold data, temperature data and pressure data corresponding to each detection cavity wall; S400: If it is determined that the mold portion facing any of the detection cavity walls is not completely cooled, the cooling step is performed again.

[0023] The execution subject of the monitoring method for an injection molding machine of the present invention can be a central control unit in the injection molding machine, or a dedicated monitoring device, which is not limited in this embodiment. This specification takes the execution subject being a monitoring device as an example for explanation.

[0024] Based on S100, the monitoring device can be configured to communicate with the central control unit. The central control unit can feed back a cooling completion signal to the monitoring device after controlling the cooling system to cool the mold in the cavity, so that the monitoring device can determine that the cooling process of the mold in the cavity is completed after receiving the cooling completion signal. It can be understood that in the cooling process, the high-temperature liquid injection molding material will gradually condense into a solid state under the action of the liquid cooling system, thereby forming a plastic material mold.

[0025] Based on S200, each detection cavity wall is a part of the cavity wall, so after the cooling stage is completed, each detection cavity wall will face a part of the surface of the mold formed in the cavity, and this part of the surface is the surface of the mold part facing the detection cavity wall. Each detection cavity wall can be provided with a temperature sensing module and a pressure sensing module; the monitoring device can obtain the output data of the temperature sensing module and the pressure sensor on the detection cavity wall as the feedback temperature data and pressure data of the detection cavity wall respectively.

[0026] Specifically, obtaining mold data of a mold portion that each detection cavity wall faces includes: S201: Acquire position data of each detection cavity wall in the mold cavity and area data of each detection cavity wall; S202: Acquire model data of the mold; S203: determining a mapping portion of each detection cavity wall on the mold according to the position data and area data of each detection cavity wall; S204: Determine model thickness data of each mapping portion according to the model data and the mapping portion of each detection cavity wall, so as to serve as mold data of a mold portion that the corresponding detection cavity wall faces.

[0027] The position data is used to indicate the position of each detection cavity wall in the cavity, and the area data is used to indicate the area of ​​the end surface of each detection cavity wall facing the mold. The position data and area data of each detection cavity wall can be measured in advance and stored in association with each detection cavity wall for retrieval when executing S201.

[0028] The model data is used to represent the specific form of the mold, and the model data includes the mold shape data and the thickness data of each part of the mold. The model data can be stored in advance by the relevant operator. The monitoring device can first calculate the mold part that the detection cavity wall faces on the mold shape based on the position data of the detection cavity wall and the mold shape data, as the mapping mold part, and then configure the area data as the area of ​​the mapping mold part of the detection cavity wall, so as to obtain the mapping part of the detection cavity wall on the mold.

[0029] The monitoring device can determine the thickness data of the mold part where the mapping part is located based on the mapping part and the model data. Since the surface of the mold part corresponding to a detection cavity wall is likely to be a curved surface, there may be multiple thickness data corresponding to a mapping part. Therefore, in this embodiment, the monitoring device is configured to calculate the average value of all thickness data corresponding to a mapping part, and use the calculation result as the model thickness data corresponding to the mapping part, that is, the mold data of the mold part directly facing the detection cavity wall.

[0030] Based on S300, it should be noted that the present application has found that for the incompletely cooled mold parts, since the mold has just passed the cooling stage, its surface temperature is relatively low, and the high-temperature liquid injection molding material inside it will exchange heat with the low-temperature surface, causing the surface temperature and external tension of the incompletely cooled mold parts to change; and for the completely cooled mold parts, since there is no high-temperature liquid injection molding material inside it, its interior and surface are both at low temperatures, and the surface temperature and external tension of this part of the mold parts are relatively stable and basically do not change. Therefore, based on the above-mentioned characteristics of the incompletely cooled mold parts, in S300 of this solution, the monitoring equipment can determine whether the temperature data and pressure data fed back by the detection cavity wall match the corresponding model thickness data, and can determine whether the mold part facing the detection cavity wall is completely cooled based on the judgment result.

[0031] Based on S400, if the judgment result is that any mold part facing the detection cavity wall is not completely cooled, that is, it means that there is high-temperature liquid injection molding material in it, then the cooling link is executed again to cool the mold in the cavity again, so that the high-temperature liquid injection molding material in the uncooled mold part can continue to be cooled, thereby achieving the effect of improving the cooling and forming degree of the uncooled mold part. If it is determined that all mold parts facing the detection cavity wall are completely cooled, there is no need to execute the cooling link again. At this time, the cavity can be opened and the demoulding component can be driven to put the mold on the conveyor belt for transmission.

[0032] In this way, after two cooling moldings, the content of high-temperature liquid injection molding materials in the incompletely cooled mold can be greatly reduced or even eliminated, greatly improving the mold shape stability of the final injection molding, thereby improving the yield of the injection mold produced by the injection molding machine and the processing efficiency of the subsequent processing links. In addition, the technical solution of the present invention can determine the incompletely cooled mold without opening the cavity, and after determining that there is an incompletely cooled mold, the secondary cooling of the mold can be completed by utilizing the cavity structure and cooling system of the injection molding machine, that is, the secondary cooling process occurs in the cavity, and there will be no deformation of the mold caused by the secondary cooling process.

[0033] Reference Figure 2 S300: Determine whether the mold part facing each detection cavity wall is completely cooled according to the mold data, temperature data and pressure data corresponding to each detection cavity wall, including: S310: Taking the initial value of the temperature data fed back from the detection cavity wall as the initial temperature of the detection cavity wall.

[0034] S320: calculating a temperature rise law of each of the detection cavity walls according to the temperature data of the detection cavity walls, and calculating a pressure rise parameter of each of the detection cavity walls according to the pressure data of each of the detection cavity walls; S330: Determine whether the temperature rise parameter and the pressure rise parameter of the detection cavity wall meet the preset standard matching the initial temperature and model thickness data; S340: If the preset standard is reached, it is determined that the mold portion facing the detection cavity wall is not completely cooled; S350: If the preset standard is not reached, it is determined that the mold portion facing the detection cavity wall is not completely cooled.

[0035] Among them, the preset standards include preset temperature rise standards and preset pressure rise standards; S330: Before determining whether the temperature rise parameter and the pressure rise parameter of the detection cavity wall have reached a preset standard matching the initial temperature and the model thickness data, the method further includes: S360: According to the initial temperature value of the detection cavity wall and the model thickness data of the opposite mold part, determine the first preset temperature rise parameter of the detection cavity wall as the preset temperature rise standard, and determine the preset pressure rise parameter of the detection cavity wall as the preset pressure rise standard.

[0036] In this embodiment, the initial value of the temperature data fed back from the detection cavity wall is usually positively correlated with the temperature of the coolant in the cooling system, that is, the lower the temperature of the coolant, the lower the initial temperature of the feedback. It should be noted that under normal circumstances, the coolant temperature is extremely low, and the cooling system will stop working after the cooling phase. The surface temperature of the mold will rise rapidly because it is difficult to maintain the coolant temperature, and the change in the mold surface temperature will cause the temperature data and pressure data fed back from its surface to change accordingly; and in this stage, the temperature data rising law and the pressure data rising law are also related to the thickness of the mold part where they are located. For example: for two mold parts with inconsistent thickness on the mold but both are completely cooled, the rising speed of the temperature data and pressure data of the thicker mold part will be lower than the rising speed of the temperature data and pressure data of the thinner mold part.

[0037] In this embodiment, the monitoring device may store a mapping table corresponding to the mold, and the mapping table includes the model thickness data intervals of each part of the mold and the first preset temperature rise parameter and the preset pressure rise parameter stored in association with each interval. Therefore, before S330, the monitoring device may first execute S360, which specifically includes: determining the model thickness data interval where the model thickness data corresponding to the detection cavity wall is located, and then searching the mapping table to obtain the first preset temperature rise parameter and the preset pressure rise parameter corresponding to the interval, and use them as the preset temperature rise standard and the preset pressure rise standard respectively.

[0038] Optionally, S330: determining whether the temperature rise parameter and the pressure rise parameter of the detection cavity wall meet the preset standard matching the initial temperature and the model thickness data, including: S331: Determine whether the pressure rise parameter reaches a preset pressure rise standard before the temperature data reaches a first preset temperature; S332: If the preset pressure rise standard is reached, after the temperature data reaches the first preset temperature, continue to determine whether the temperature rise parameter reaches the preset temperature rise standard; S333: If the preset temperature rise standard is reached, determining whether the temperature rise parameter and the pressure rise parameter of the detection cavity wall reach the preset standard matching the initial temperature and the model thickness data; S334: If the pressure rise parameter does not reach the preset pressure rise standard before the temperature data reaches the first preset temperature, or if it is determined that the temperature rise parameter does not reach the preset temperature rise standard after the temperature data reaches the first preset temperature, then it is determined that the temperature rise parameter and the pressure rise parameter of the detection cavity wall do not reach the preset standard matching the initial temperature and model thickness data.

[0039] In this embodiment, the pressure rise parameter includes the pressure data rise rate and the pressure data rise acceleration. The pressure data rise rate can be determined by calculating the change of the pressure data in a unit time, and the pressure data rise acceleration can be obtained by calculating the derivative of the pressure data rise rate. Correspondingly, the preset pressure rise standard includes the preset pressure rise rate and the preset pressure rise acceleration. S331 is specifically: the monitoring device can determine whether the temperature data rises to the first preset temperature based on the change of the temperature data fed back by the detection cavity wall. Before reaching the first preset temperature, the monitoring device can determine whether the pressure data rise rate at this stage reaches the preset pressure rise rate, and determine whether the pressure data rise acceleration reaches the preset pressure rise acceleration; if the judgment result is that the pressure data rise rate and the pressure data rise acceleration reach the preset pressure rise rate and the preset pressure rise acceleration respectively, then it is determined that the pressure rise parameter reaches the preset pressure rise standard; if the judgment result is that the pressure data rise rate does not reach the preset pressure rise rate, or the pressure data rise acceleration does not reach the preset pressure rise acceleration, then it is determined that the pressure rise parameter does not reach the preset pressure rise standard.

[0040] As time goes by, the mold temperature will continue to rise until it reaches the first preset temperature. If the pressure rise parameter always reaches the preset pressure rise standard during the temperature rise process, S332 can be executed. In this embodiment, the temperature rise parameter includes the temperature data rise rate and the temperature data rise acceleration. The temperature data rise rate can be determined by calculating the change in temperature data per unit time, and the temperature data rise acceleration can be calculated by taking the derivative of the temperature data rise rate. Correspondingly, the preset temperature rise standard includes the first preset temperature rise rate and the first preset temperature rise acceleration. S332 is specifically: after determining that the temperature data rises to the first preset temperature, the monitoring device can judge whether the temperature data rise rate in this stage reaches the first preset temperature rise rate, and determine whether the temperature data rise acceleration reaches the first preset temperature rise acceleration; if the judgment result is that the temperature data rise rate and the temperature data rise acceleration reach the first preset temperature rise rate and the first preset temperature rise acceleration respectively, then it is determined that the temperature rise parameter reaches the preset temperature rise standard; if the judgment result is that the temperature data rise rate does not reach the first preset temperature rise rate, or the temperature data rise acceleration does not reach the first preset temperature rise acceleration, then it is determined that the temperature rise parameter does not reach the preset temperature rise standard, and at the same time it can be determined that the temperature rise parameter and the pressure rise parameter of the detection cavity wall reach the preset standard matching the initial temperature and model thickness data.

[0041] It is understandable that the first preset temperature is a temperature value higher than the initial temperature of the detection cavity wall. It should be noted that it was found in the test that when the technical solution of the present invention is executed, the mold temperature will rise rapidly because the mold has just finished the cooling stage, resulting in serious distortion of the temperature rise parameters of each detection cavity wall. Specifically, the temperature rise parameters of the mold part facing the non-destructive detection cavity wall are very easy to reach the preset temperature rise standard, but at this time, the pressure rise parameters of the completely cooled mold part and the incompletely cooled mold part will be greatly different; this phenomenon will be reversed after the mold temperature rises to a relatively high temperature. After the mold temperature rises to a relatively high temperature, the temperature rise parameters of the completely cooled mold part and the incompletely cooled mold part will begin to differ greatly, and the pressure rise parameters of the two will decrease and be distorted, making it difficult to reach the preset pressure rise standard. In view of this, the technical solution of the present invention reasonably allocates the judgment time of the temperature rise parameter and the pressure rise parameter. Before the temperature data reaches the first preset temperature, only the pressure rise parameter is judged, which can avoid the distortion of the temperature rise parameter just after the cooling link is stopped. After the temperature data reaches the first preset temperature, only the temperature rise parameter is judged, which can avoid the distortion of the pressure rise parameter after the temperature reaches a relatively high level, thereby helping to improve the accuracy of judging whether the mold part facing each detection cavity wall has completed cooling and forming.

[0042] It was found during use that due to the different temperatures of injection molding raw materials and cooling strategies of the cooling systems of different molds, the initial temperatures of different molds after the cooling process are different. For molds with extremely low temperatures after the cooling process, although their temperature is much lower than the first preset temperature at this time, due to their too low temperature, their pressure data will not have a significant increase in a short period of time, which can easily cause the pressure rise parameter to fail to reach the preset pressure rise standard, resulting in the mold part facing the detection cavity wall being misjudged as not fully cooled.

[0043] In view of the above problem, the technical solution of the present invention further includes, before step S331 of determining whether the pressure rise parameter reaches a preset pressure rise standard before the temperature data reaches the first preset temperature: S335: Determine whether the temperature data reaches a second preset temperature; S336: If the second preset temperature is reached, executing the step of determining whether the pressure rise parameter reaches the preset pressure rise standard before the temperature data reaches the first preset temperature; S331.

[0044] Wherein, the second preset temperature is lower than the first preset temperature data.

[0045] In this embodiment, the monitoring device will compare the temperature data fed back by each detection cavity wall with the second preset temperature data. If the comparison result is that the fed back temperature data is greater than or equal to the second preset temperature, it means that the temperature of the mold part facing the detection cavity wall is not at an extremely low temperature, or has risen from an extremely low temperature to a relatively high second preset temperature. The monitoring device can use the pressure rise parameter that changes more obviously at this time to execute step S331; if the comparison result is that the fed back temperature data is less than the second preset temperature, it means that the temperature of the mold part facing the detection cavity wall is still at an extremely low temperature, or has risen from an extremely low temperature to a relatively high second preset temperature. The monitoring device does not execute step S331 at this time, and continues to wait for the temperature data to rise to the second preset temperature.

[0046] Due to the principle of thermal expansion and contraction, at the end of the cooling process, it is impossible to ensure that each detection cavity wall is in contact with the surface of the mold. If there is a gap between the detection cavity wall and the mold surface, the feedback temperature data and pressure data will also have large errors, resulting in the inability to accurately determine whether the mold part facing each detection cavity wall is completely cooled.

[0047] In view of the above problem, in this embodiment, each of the detection cavity walls is configured to be movable toward the mold; Before the step S300 of determining whether the mold portion facing each detection cavity wall is completely cooled according to the mold data, temperature data and pressure data corresponding to each detection cavity wall, the method further includes: S500: determining whether each of the detection cavity walls is in contact with the mold according to the pressure data fed back by each of the detection cavity walls; S600: If it is determined that all the detection cavity walls are in contact with the mold, then executing step S300 to determine whether the mold portion facing each detection cavity wall is completely cooled according to the mold data, temperature data and pressure data corresponding to each detection cavity wall; S700: If it is determined that the detection cavity wall is not in contact with the mold, control the detection cavity wall to move toward the mold until it contacts with the mold and then stops moving.

[0048] In this embodiment, each detection cavity wall can move toward or away from the mold under the drive of an independent driving module. S500 is specifically: the monitoring device can compare the pressure data fed back by each detection cavity wall with the preset pressure threshold; if the pressure data fed back by all detection cavity walls are greater than the preset pressure threshold, it indicates that each detection cavity wall is in contact with the mold surface, and then the monitoring device can execute step S300 to obtain the mold data of the mold part facing each detection cavity wall and its feedback temperature data and pressure data; if there is any detection cavity wall feedback pressure data less than the preset pressure threshold, it means that there is a gap between the detection cavity wall and the mold, that is, the detection cavity wall is not in contact with the mold at this time, and the monitoring device can control the driving module corresponding to the detection cavity wall to drive it to move toward the mold. During the process of the detection cavity wall moving toward the mold, the monitoring device can continuously determine whether the detection cavity wall is in contact with the mold based on the pressure data fed back by the detection cavity wall, specifically, determine whether the difference between two consecutive pressure data fed back is greater than a preset difference; if the difference is greater than the preset difference, the monitoring device can determine that the detection cavity wall has been in contact with the mold and control the detection cavity wall to stop moving through the driving module; if the difference is not greater than the preset difference, the monitoring device can determine that the detection cavity wall is not in contact with the mold and control the detection cavity wall to continue moving through the driving module until it is determined that the difference between two consecutive pressure data is greater than the preset difference.

[0049] Such an arrangement can avoid the gap between the detection cavity wall and the mold from affecting the pressure data and temperature data, thereby facilitating the improvement of the accuracy of the pressure data and temperature data used for calculation in step S300. In addition, since the technical solution of the present invention performs S300 only after all the detection cavity walls are in contact with the mold, compared with performing step S300 first on the detection cavity walls that have been in contact, it can avoid the vibration of the non-contacting detection cavity wall after moving to the contacting cavity wall from affecting the pressure data fed back by the contacting cavity wall.

[0050] Of course, after executing step S400, the monitoring device can also control the corresponding driving module to restore the moved detection cavity wall to the initial position, so that the cavity is restored to the initial state for the next injection molding.

[0051] In an optional embodiment, the number of the detection cavity walls is 2N, wherein N of the detection cavity walls are arranged opposite to the remaining N of the detection cavity walls one by one; Said N is a positive integer.

[0052] Such a setting can make the forces exerted by the two facing detection cavity walls on the mold surface offset each other, thereby avoiding the forces exerted by multiple detection cavity walls on the mold surface affecting each other and causing deviations in the pressure data fed back by each detection cavity wall, which is beneficial to improving the accuracy of pressure data acquisition.

[0053] The present invention further proposes a monitoring device applied to an injection molding machine, wherein a cavity is formed in the injection molding machine, the cavity is used for an injection molding mold, and the cavity wall of the cavity includes a plurality of detection cavity walls.

[0054] Reference Figure 3 , monitoring equipment includes: a memory 11; and The processor 12 stores an injection molding machine monitoring program in the memory 11 and is executed by the processor 12 . When the injection molding machine monitoring method is executed by the processor 12 , the injection molding machine monitoring method described above is implemented.

[0055] Among them, the specific steps of the injection molding machine monitoring method refer to the above embodiments. Since the monitoring device adopts all the technical solutions of all the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here. The memory 11 can be a high-speed RAM memory or a stable memory (non-volatile memory), such as a disk memory. The memory 11 can also be a storage device independent of the above monitoring device; the processor 12 can be a CPU. The memory 11 and the processor 12 are connected by a communication bus 13, which can be a UART bus or an I2C bus.

[0056] The above descriptions are only optional embodiments of the present invention, and are not intended to limit the patent scope of the present invention. All equivalent structural changes made using the contents of the present invention's specification and drawings, or directly / indirectly applied in other related technical fields, are included in the patent protection scope of the present invention.

Claims

1. A method for monitoring an injection molding machine, characterized in that: The injection molding machine is formed with a cavity, the cavity is used for injection molding, the cavity wall of the cavity includes a plurality of detection cavity walls, and the injection molding machine monitoring method includes: Determining whether the cooling process of the mold in the cavity is completed; If completed, then the mold data of the mold part facing each detection cavity wall, as well as the temperature data and pressure data fed back by each detection cavity wall are obtained; Determine whether the mold portion facing each detection cavity wall is completely cooled according to the mold data, temperature data and pressure data corresponding to each detection cavity wall; If it is determined that the mold portion facing any of the detection cavity walls is not completely cooled, the cooling step is performed again.

2. The method for monitoring an injection molding machine according to claim 1, characterized in that: The step of obtaining mold data of a mold portion that each detection cavity wall faces includes: Acquire the position data of each detection cavity wall in the cavity and the area data of each detection cavity wall; Acquiring model data of the mold; Determine a mapping portion of each detection cavity wall on the mold according to the model data and the position data and area data of each detection cavity wall; According to the model data and the mapping part of each detection cavity wall, the model thickness data of each mapping part is determined to serve as the mold data of the mold part that the corresponding detection cavity wall faces.

3. The method for monitoring an injection molding machine according to claim 2, characterized in that: Determining whether the mold portion facing each detection cavity wall is completely cooled according to the mold data, temperature data and pressure data corresponding to each detection cavity wall includes: Taking the initial value of the temperature data fed back by the detection cavity wall as the initial temperature of the detection cavity wall; Calculating the temperature rise law of each detection cavity wall according to the temperature data of the detection cavity wall, and calculating the pressure rise parameter of each detection cavity wall according to the pressure data of each detection cavity wall; Determining whether the temperature rise parameter and the pressure rise parameter of the detection cavity wall meet the preset standard matching the initial temperature and the model thickness data; If the preset standard is reached, it is determined that the mold portion facing the detection cavity wall is not completely cooled; If the preset standard is not reached, it is determined that the mold portion facing the detection cavity wall is not completely cooled.

4. The method for monitoring an injection molding machine according to claim 3, wherein: The preset standards include a preset temperature rise standard and a preset pressure rise standard; Before determining whether the temperature rise parameter and the pressure rise parameter of the detection cavity wall reach a preset standard matching the initial temperature and the model thickness data, the method further includes: According to the initial temperature value of the detection cavity wall and the model thickness data of the opposite mold part, the first preset temperature rise parameter of the detection cavity wall is determined as the preset temperature rise standard, and the preset pressure rise parameter of the detection cavity wall is determined as the preset pressure rise standard.

5. The method for monitoring an injection molding machine according to claim 4, characterized in that: The step of determining whether the temperature rise parameter and the pressure rise parameter of the detection cavity wall meet the preset standard matching the initial temperature and the model thickness data includes: determining whether the pressure rise parameter reaches a preset pressure rise standard before the temperature data reaches a first preset temperature; If the preset pressure rise standard is reached, then after the temperature data reaches the first preset temperature, continue to determine whether the temperature rise parameter reaches the preset temperature rise standard; If the preset temperature rise standard is reached, determining that the temperature rise parameter and the pressure rise parameter of the detection cavity wall reach the preset standard matching the initial temperature and the model thickness data; If the pressure rise parameter does not reach the preset pressure rise standard before the temperature data reaches the first preset temperature, or if it is determined that the temperature rise parameter does not reach the preset temperature rise standard after the temperature data reaches the first preset temperature, it is determined that the temperature rise parameter and the pressure rise parameter of the detection cavity wall do not reach the preset standard matching the initial temperature and model thickness data.

6. The method for monitoring an injection molding machine according to claim 5, characterized in that: Before the step of determining whether the pressure rise parameter reaches a preset pressure rise standard before the temperature data reaches a first preset temperature, the method further includes: Determining whether the temperature data reaches a second preset temperature; If the second preset temperature is reached, then executing the step of determining whether the pressure rise parameter reaches a preset pressure rise standard before the temperature data reaches the first preset temperature; Wherein, the second preset temperature is lower than the first preset temperature.

7. The method for monitoring an injection molding machine according to claim 3, characterized in that: The pressure rise parameters include pressure data rise rate and pressure data rise acceleration; The temperature rise parameters include a temperature data rise rate and a temperature data rise acceleration.

8. The method for monitoring an injection molding machine according to claim 1, wherein: Each of the detection cavity walls is configured to be movable toward the mold; Before the step of determining whether the mold portion facing each detection cavity wall is completely cooled according to the mold data, temperature data and pressure data corresponding to each detection cavity wall, the method further includes: Determining whether each of the detection cavity walls is in contact with the mold according to the pressure data fed back by each of the detection cavity walls; If it is determined that all the detection cavity walls are in contact with the mold, then performing the step of determining whether the mold portion facing each detection cavity wall is completely cooled according to the mold data, temperature data and pressure data corresponding to each detection cavity wall; If it is determined that any one of the detection cavity walls is not in contact with the mold, the detection cavity wall is controlled to move toward the mold until it contacts with the mold and then stops moving.

9. The method for monitoring an injection molding machine according to any one of claims 1 to 8, characterized in that: The number of the detection cavity walls is 2N, wherein N of the detection cavity walls are arranged opposite to the remaining N of the detection cavity walls one by one; Said N is a positive integer.

10. A monitoring device, characterized in that: Applied to an injection molding machine, wherein a cavity is formed in the injection molding machine, wherein the cavity is used for an injection molding mold, wherein a cavity wall of the cavity includes a plurality of detection cavity walls, and the monitoring device includes: memory; and, A processor, an injection molding machine monitoring program stored in the memory and executed by the processor, wherein the injection molding machine monitoring method, when executed by the processor, implements the injection molding machine monitoring method as described in any one of claims 1 to 9.

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