A monitoring and early warning method and system for hot runners

Abstract

This invention relates to the field of hot runner early warning technology, and discloses a method and system for monitoring and early warning of hot runners. The method includes: acquiring the temperature of the hot fluid in the hot runner, comparing it with a target temperature, and determining the temperature difference if it is lower than the target temperature; controlling a heating device to heat the hot fluid based on the temperature difference; acquiring the real-time pressure and real-time injection speed of the hot fluid after heating in the hot runner, determining the pressure difference between the hot fluid and the target pressure, and determining the injection speed difference between the hot fluid and the target injection speed; and comparing these values ​​with preset pressure difference and preset injection speed difference. If the values ​​are greater than the preset pressure difference and preset injection speed difference, it is determined that the hot fluid in the hot runner is in an abnormal injection stage, thereby achieving monitoring and early warning of the hot runner. This invention can comprehensively and accurately realize the monitoring and early warning functions of the hot runner system, effectively improving the stability of the production process and product quality.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of hot runner monitoring, in particular to a monitoring and early warning method and system for a hot runner. BACKGROUND

[0002] With the continuous development of plastic injection molding process, hot runner technology is increasingly widely used in injection molds. Hot runner molds can improve material utilization, reduce production costs, and ensure the molding quality of the parts.

[0003] However, although hot runner technology brings many advantages, its complexity and high temperature and high pressure working environment also pose potential risks. During long-term operation, hot runner systems may have temperature abnormalities, leaks, blockages and other faults, which not only affect production efficiency, but also can cause equipment damage and even safety accidents. Therefore, it is particularly important to monitor and warn the hot runner in real time. The present application proposes a monitoring and early warning method and system for a hot runner, aiming to achieve comprehensive monitoring and timely warning of the running state of the hot runner. SUMMARY

[0004] The purpose of the present application is to provide a monitoring and early warning method and system for a hot runner, which solves the problem of temperature abnormalities, leaks, blockages and other faults in hot runner systems during long-term operation, which affects production efficiency, equipment damage and even safety accidents.

[0005] The present application provides a monitoring and early warning method for a hot runner, the method comprising:

[0006] obtaining the temperature of the hot fluid in the hot runner, comparing the temperature of the hot fluid with the target temperature, and if the temperature of the hot fluid is less than the target temperature, determining the temperature difference between the temperature of the hot fluid and the target temperature;

[0007] controlling the heating device to heat the hot fluid in the hot runner according to the temperature difference;

[0008] obtaining the real-time pressure and real-time injection speed of the heated hot fluid in the hot runner, determining the pressure difference between the real-time pressure and the target pressure, and determining the injection speed difference between the real-time injection speed and the target injection speed;

[0009] comparing the pressure difference with the preset pressure difference, and comparing the injection speed difference with the preset injection speed difference;

[0010] If the pressure difference is greater than the preset pressure difference, and the injection speed difference is greater than the preset injection speed difference, it is determined that the hot fluid in the hot runner is in an abnormal injection stage, so as to realize the monitoring and early warning of the hot runner.

[0011] Preferably, the heating device is controlled according to the temperature difference to heat the hot fluid in the hot runner, comprising:

[0012] The heating power of the heating device is determined according to the temperature difference;

[0013] The heating device is controlled according to the heating power to heat the hot fluid in the hot runner;

[0014] The real-time hot fluid temperature in the hot runner is obtained when heating, and the heating power is adjusted according to the real-time hot fluid temperature to make the real-time hot fluid temperature reach the target temperature.

[0015] Preferably, the heating power of the heating device is determined according to the temperature difference, comprising:

[0016] The first temperature difference, the second temperature difference and the third temperature difference are set in advance, and the first temperature difference, the second temperature difference and the third temperature difference increase in turn;

[0017] The heating power of the heating device is set according to the relationship between the temperature difference and the first temperature difference, the second temperature difference and the third temperature difference;

[0018] If the temperature difference is less than the first temperature difference, the heating power of the heating device is set as the first heating power P1;

[0019] If the temperature difference is greater than or equal to the first temperature difference and less than the second temperature difference, the heating power of the heating device is set as the second heating power P2;

[0020] If the temperature difference is greater than or equal to the second temperature difference and less than the third temperature difference, the heating power of the heating device is set as the third heating power P3;

[0021] If the temperature difference is greater than or equal to the third temperature difference, the heating power of the heating device is set as the fourth heating power P4; wherein P1

[0022] Preferably, the pressure difference is compared with a preset pressure difference, and the injection speed difference is compared with a preset injection speed difference, further comprising:

[0023] If the pressure difference is less than or equal to the preset pressure difference and the injection speed difference is less than or equal to the preset injection speed difference, it is determined that the hot fluid in the hot runner is in a normal injection stage.

[0024] Preferably, the pressure difference value is compared with a preset pressure difference value, and the injection speed difference value is compared with a preset injection speed difference value, and the method further comprises:

[0025] If the pressure difference value is greater than the preset pressure difference value, and the injection speed difference value is less than or equal to the preset injection speed difference value, it is determined whether a pressure difference rate between the pressure difference value and the preset pressure difference value is higher than a difference rate threshold value, and if the pressure difference rate is higher than the difference rate threshold value, it is determined that the hot fluid in the hot runner is in an abnormal injection stage.

[0026] If the pressure difference value is less than or equal to the preset pressure difference value, and the injection speed difference value is greater than the preset injection speed difference value, it is determined whether an injection difference rate between the injection speed difference value and the preset injection speed difference value is higher than the difference rate threshold value, and if the injection difference rate is higher than the difference rate threshold value, it is determined that the hot fluid in the hot runner is in an abnormal injection stage.

[0027] Preferably, the pressure difference rate is calculated according to the following formula:

[0028] Cy=(Ys-Yo) / Yo;

[0029] Wherein, Cy represents the pressure difference rate, Ys represents the pressure difference value, and Yo represents the preset pressure difference value.

[0030] Preferably, the injection difference rate is calculated according to the following formula:

[0031] Cz=(Zs-Zo) / Zo;

[0032] Wherein, Cz represents the injection difference rate, Zs represents the injection speed difference value, and Zo represents the preset injection speed difference value.

[0033] Preferably, the difference rate threshold value is set to 25%.

[0034] Preferably, after determining that the hot fluid in the hot runner is in an abnormal injection stage, the method further comprises:

[0035] Determining an abnormal injection level of the hot fluid in the hot runner according to the pressure difference value and the injection speed difference value;

[0036] Determining a warning level according to the abnormal injection level, and giving a warning.

[0037] The application also discloses a monitoring and warning system for a hot runner, which is used for the monitoring and warning method for a hot runner.

[0038] An acquisition module is configured to acquire the temperature of the hot fluid in the hot runner, and the real-time pressure and the real-time injection speed of the heated hot fluid in the hot runner.

[0039] a processing module configured to compare the temperature of the hot fluid with a target temperature, determine a temperature difference between the temperature of the hot fluid and the target temperature if the temperature of the hot fluid is less than the target temperature, and set a heating power of a heating device according to the temperature difference; the processing module is further configured to determine a pressure difference between the real-time pressure and a target pressure, and determine an injection speed difference between the real-time injection speed and a target injection speed; and compare the pressure difference with a preset pressure difference, and compare the injection speed difference with a preset injection speed difference;

[0040] a control module configured to control the heating device to heat the hot fluid in the hot runner according to the heating power set by the processing module;

[0041] a warning module configured to determine that the hot fluid in the hot runner is in an abnormal injection stage when the pressure difference is greater than the preset pressure difference and the injection speed difference is greater than the preset injection speed difference, so as to realize monitoring and early warning of the hot runner.

[0042] Compared with the prior art, the present application can comprehensively and accurately realize the monitoring and early warning function of the hot runner system, effectively improve the stability of the production process and the product quality, and realize real-time monitoring of the temperature of the hot fluid, the real-time pressure and the injection speed through integrated module design, thereby providing real-time and accurate data support for production operation. The present application can obtain the temperature of the hot fluid in the hot runner in real time, compare it with the target temperature, accurately monitor and timely control the hot runner, ensure that the temperature of the hot fluid remains within a suitable range, and automatically control the heating device to heat the hot fluid in the hot runner according to the temperature difference, thereby improving the heating efficiency and accuracy and avoiding excessive temperature fluctuation. After adjusting the temperature, not only the temperature is monitored, but also the real-time pressure and real-time injection speed of the heated hot fluid are obtained, the performance of the hot runner is evaluated from multiple aspects, and the hot runner is found to be in an abnormal injection stage in time by comparing the pressure difference and the injection speed difference with the preset values, thereby realizing early warning, avoiding the production of unqualified products, effectively ensuring the normal operation of the hot runner, and helping to improve the quality and consistency of the injection molded products. BRIEF DESCRIPTION OF DRAWINGS

[0043] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only embodiments of the present application, and those skilled in the art can obtain other drawings according to the provided drawings without any creative effort.

[0044] Figure 1is a flowchart of a monitoring and early warning method for a hot runner according to the present application.

[0045] Figure 2 is a functional block diagram of a monitoring and early warning system for a hot runner according to the present application. DETAILED DESCRIPTION

[0046] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0047] As shown in Figure 1 The present application provides a monitoring and early warning method for a hot runner, which comprises the following steps:

[0048] S1, obtaining the temperature of the hot fluid in the hot runner, comparing the temperature of the hot fluid with a target temperature, and determining the temperature difference between the temperature of the hot fluid and the target temperature if the temperature of the hot fluid is less than the target temperature.

[0049] S2, controlling the heating device to heat the hot fluid in the hot runner according to the temperature difference.

[0050] S3, obtaining the real-time pressure and real-time injection speed of the heated hot fluid in the hot runner, determining the pressure difference between the real-time pressure and a target pressure, and determining the injection speed difference between the real-time injection speed and a target injection speed.

[0051] S4, comparing the pressure difference with a preset pressure difference, and comparing the injection speed difference with a preset injection speed difference.

[0052] S5, if the pressure difference is greater than the preset pressure difference and the injection speed difference is greater than the preset injection speed difference, determining that the hot fluid in the hot runner is in an abnormal injection stage, so as to realize the monitoring and early warning of the hot runner.

[0053] In this embodiment, the present application aims to provide an efficient monitoring and warning mechanism for hot runners, which ensures the stability and safety of hot fluids during the injection molding process through a series of precise steps. The method mainly includes the following steps: first, real-time acquisition of the temperature data of the hot fluid inside the hot runner. The key to this step is to compare the collected temperature value with the preset target temperature value in detail. If the actual temperature of the hot fluid is lower than the target temperature, it means that the system will calculate the temperature difference between the two, which will be used as the basis for subsequent heating control. Then, according to the temperature difference just calculated, the heating device is instructed to heat the hot fluid appropriately. The purpose of this step is to ensure that the temperature of the hot fluid can quickly and smoothly rise to the target temperature, thereby ensuring the smooth progress of the injection molding process. Subsequently, the monitoring focus shifts to the real-time pressure and injection speed of the heated hot fluid inside the hot runner. These two parameters are crucial for the control of injection quality. The pressure difference between the real-time pressure and the target pressure, as well as the speed difference between the real-time injection speed and the target injection speed, are calculated to have a comprehensive understanding of the current injection state. The pressure difference and the speed difference just calculated are compared with the preset threshold values. The purpose of this step is to determine whether these parameters are within the normal range. Any parameter exceeding the preset threshold value may indicate that the injection process has an abnormality. Finally, the comparison results of the pressure difference and the speed difference are comprehensively judged. If both the pressure difference and the speed difference exceed the preset threshold value, the system will determine that the current injection stage is an abnormal injection stage and trigger the warning mechanism. This mechanism can include warning prompts, automatic parameter adjustment, or stopping the injection process to prevent defects in the injection product or damage to the equipment caused by abnormalities. Through the above steps, the present application can provide strong protection for the stable operation of the hot runner, effectively improve the quality and efficiency of the injection molding production, and reduce the production risk.

[0054] Preferably, the heating device is controlled to heat the hot fluid in the hot runner according to the temperature difference, including: determining the heating power of the heating device according to the temperature difference; controlling the heating device to heat the hot fluid in the hot runner according to the heating power; obtaining the real-time hot fluid temperature in the hot runner during heating, and adjusting the heating power according to the real-time hot fluid temperature to make the real-time hot fluid temperature reach the target temperature.

[0055] In this embodiment, in order to ensure that the temperature of the hot fluid in the hot runner can accurately meet the needs of the production process, a heating method based on temperature difference control of the heating device is provided. The main includes, by measuring or calculating the difference between the actual temperature and the target temperature of the hot fluid in the hot runner, that is, the temperature difference. This temperature difference is an important parameter for measuring whether the hot fluid needs to be heated and the degree of heating. Next, according to the temperature difference, the heating power required by the heating device is determined. This step is to analyze the functional relationship between the temperature difference and the heating power, and find the matching heating power. This process may involve presetting and adjusting the performance parameters of the heating device to ensure that the heating effect is optimal. Then, according to the determined heating power, the heating device heats the hot fluid in the hot runner. In this process, the heating device will work according to the set heating power, so that the temperature of the hot fluid gradually rises and approaches the target temperature. At the same time, the temperature of the hot fluid in the hot runner needs to be monitored in real time, that is, the real-time hot fluid temperature is obtained. This is to ensure the smooth progress of the heating process and timely adjust the heating power to prevent the hot fluid temperature from being too high or too low. Finally, according to the real-time hot fluid temperature, the heating power is adjusted. This step is to compare the difference between the real-time hot fluid temperature and the target temperature, and adjust the heating power according to this difference. The purpose is to make the real-time hot fluid temperature quickly and accurately reach the target temperature, so as to ensure the stability of the production process and the product quality. In general, the present application realizes the accurate control of the heating of the hot fluid by monitoring the temperature of the hot fluid in real time and adjusting the heating power according to the temperature difference, which helps to improve the production efficiency and product quality.

[0056] Preferably, determining the heating power of the heating device according to the temperature difference comprises: presetting a first temperature difference, a second temperature difference and a third temperature difference, the first temperature difference, the second temperature difference and the third temperature difference increase in turn; setting the heating power of the heating device according to the relationship between the temperature difference and the first temperature difference, the second temperature difference and the third temperature difference; if the temperature difference is less than the first temperature difference, setting the heating power of the heating device as a first heating power P1; if the temperature difference is greater than or equal to the first temperature difference and less than the second temperature difference, setting the heating power of the heating device as a second heating power P2; if the temperature difference is greater than or equal to the second temperature difference and less than the third temperature difference, setting the heating power of the heating device as a third heating power P3; if the temperature difference is greater than or equal to the third temperature difference, setting the heating power of the heating device as a fourth heating power P4; wherein P1

[0057] Preferably, the pressure difference value is compared with a preset pressure difference value, and the injection speed difference value is compared with a preset injection speed difference value, and further comprising: if the pressure difference value is less than or equal to the preset pressure difference value, and the injection speed difference value is less than or equal to the preset injection speed difference value, it is determined that the hot fluid in the hot runner is in a normal injection stage.

[0058] In the embodiment, the actually measured pressure difference value is compared with the preset standard pressure difference value, and the detected injection speed difference value is compared with the preset injection speed difference value. This process not only involves the evaluation of the pressure difference value, but also involves the evaluation of the injection speed difference value. Specifically, if it is found in the comparison process that the actually measured pressure difference value is less than or equal to the preset pressure difference value, and the actually measured injection speed difference value is also less than or equal to the preset injection speed difference value, it is determined that the hot fluid in the hot runner is in a normal injection stage.

[0059] Preferably, the pressure difference value is compared with a preset pressure difference value, and the injection speed difference value is compared with a preset injection speed difference value, and further comprising: if the pressure difference value is greater than the preset pressure difference value, and the injection speed difference value is less than or equal to the preset injection speed difference value, it is determined whether a pressure difference rate between the pressure difference value and the preset pressure difference value is higher than a difference rate threshold value, and if the pressure difference rate is higher than the difference rate threshold value, it is determined that the hot fluid in the hot runner is in an abnormal injection stage.

[0060] If the pressure difference value is less than or equal to the preset pressure difference value, and the injection speed difference value is greater than the preset injection speed difference value, it is determined whether an injection difference rate between the injection speed difference value and the preset injection speed difference value is higher than a difference rate threshold value, and if the injection difference rate is higher than the difference rate threshold value, it is determined that the hot fluid in the hot runner is in an abnormal injection stage.

[0061] In the present embodiment, first, the detected real-time pressure difference value is compared with the preset pressure difference value. Then, the real-time measured injection speed difference value is compared with the predefined preset injection speed difference value. When the real-time pressure difference value exceeds the preset pressure difference value, and the real-time injection speed difference value is less than or equal to the preset injection speed difference value, the pressure difference rate between the pressure difference value and the preset pressure difference value is calculated. If the pressure difference rate exceeds the set difference rate threshold, it is determined that the hot fluid in the hot runner is in an abnormal injection stage. Conversely, if the real-time pressure difference value is less than or equal to the preset pressure difference value, and the real-time injection speed difference value exceeds the preset injection speed difference value, the injection difference rate between the injection speed difference value and the preset injection speed difference value is calculated. If the injection difference rate also exceeds the set difference rate threshold, it is also determined that the hot fluid in the hot runner is in an abnormal injection stage.

[0062] Preferably, the pressure difference rate is calculated according to the following formula:

[0063] Cy = (Ys - Yo) / Yo;

[0064] Wherein, Cy represents the pressure difference rate, Ys represents the pressure difference value, and Yo represents the preset pressure difference value.

[0065] Preferably, the injection difference rate is calculated according to the following formula:

[0066] Cz = (Zs - Zo) / Zo;

[0067] Wherein, Cz represents the injection difference rate, Zs represents the injection speed difference value, and Zo represents the preset injection speed difference value.

[0068] Preferably, the difference rate threshold is set to 25%.

[0069] Preferably, after determining that the hot fluid in the hot runner is in an abnormal injection stage, it further includes: determining the abnormal injection level of the hot fluid in the hot runner according to the pressure difference value and the injection speed difference value; determining the warning level according to the abnormal injection level, and giving a warning.

[0070] In this embodiment, after confirming that the hot fluid in the hot runner is in an abnormal injection stage, first, the abnormal injection level of the hot fluid in the hot runner is determined according to the measured pressure difference and injection speed difference; second, the corresponding warning level is set according to the determined abnormal injection level; and finally, the warning measures are executed. This series of operations aims to ensure the stability of the injection process and the product quality, to discover and handle possible problems in a timely manner, and to avoid production accidents and losses. By carefully monitoring and analyzing the flow state of the hot fluid in the hot runner, the production efficiency and product quality can be effectively improved, and the production risk can be reduced.

[0071] The application also discloses a monitoring and warning system for a hot runner, which is used for applying the monitoring and warning method for the hot runner. Figure 2 As shown in the figure, the system comprises:

[0072] An acquisition module is configured to acquire the temperature of the hot fluid in the hot runner and the real-time pressure and real-time injection speed of the heated hot fluid in the hot runner.

[0073] A processing module is configured to compare the temperature of the hot fluid with a target temperature, and if the temperature of the hot fluid is less than the target temperature, determine a temperature difference between the temperature of the hot fluid and the target temperature, and set a heating power of a heating device according to the temperature difference. The processing module is also configured to determine a pressure difference between the real-time pressure and a target pressure, and determine an injection speed difference between the real-time injection speed and a target injection speed, and compare the pressure difference with a preset pressure difference and compare the injection speed difference with a preset injection speed difference.

[0074] A control module is configured to control the heating device to heat the hot fluid in the hot runner according to the heating power set by the processing module.

[0075] A warning module is configured to determine that the hot fluid in the hot runner is in an abnormal injection stage when the pressure difference is greater than the preset pressure difference and the injection speed difference is greater than the preset injection speed difference, so as to realize the monitoring and warning of the hot runner.

[0076] The application can comprehensively and accurately realize the monitoring and warning function of the hot runner system, effectively improve the stability of the production process and the product quality. Specifically, the system realizes real-time monitoring of the temperature of the hot fluid, the real-time pressure and the injection speed through integrated module design, and provides real-time and accurate data support for production operation.

[0077] Firstly, the efficient operation of the acquisition module ensures the timeliness and accuracy of the monitoring data, laying a solid foundation for subsequent analysis and processing. This real-time data collection capability enables the system to quickly respond to any subtle changes within the hot runner, providing the possibility of preventing potential problems.

[0078] Secondly, the intelligent analysis function of the processing module is one of the core advantages of the system. It not only can accurately compare the temperature of the hot fluid and automatically adjust the power of the heating device according to the temperature difference to achieve precise temperature control, but also can analyze the deviation of pressure and injection speed at the same time, providing a scientific basis for abnormal identification in the production process through preset threshold values. This multi-dimensional and comprehensive analysis method greatly improves the accuracy and reliability of early warning.

[0079] The control module accurately controls the working state of the heating device according to the instructions of the processing module, realizing dynamic adjustment of the temperature of the hot fluid in the hot runner. This closed-loop control strategy ensures that the hot runner system is always in the best working state, effectively avoiding injection defects caused by temperature fluctuations and other problems.

[0080] Finally, the introduction of the early warning module further enhances the monitoring and early warning functions of the system. It can quickly identify the abnormal injection stage in the hot runner when both pressure and injection speed are abnormal and send an early warning signal. This not only helps operators take timely measures to solve problems, but also effectively prevents production accidents and ensures the safety of personnel and equipment. In summary, the monitoring and early warning system for hot runners disclosed in the present application provides a strong guarantee for the stable operation and efficient production of hot runner systems with its comprehensive, accurate and intelligent monitoring and early warning functions. The popularization and application of this system will strongly promote the technological progress and industrial upgrading of the injection molding industry.

[0081] Finally, it should be noted that the above examples are only used to illustrate the technical solutions of the present application and not to limit them. Although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that they can still modify or equivalently replace the technical solutions of the present application, and these modifications or equivalent replacements will not make the modified technical solutions deviate from the spirit and scope of the technical solutions of the present application.

[0082] The system provided by the above embodiments is only exemplified by the division of the above functional modules. In actual application, the above functions can be completed by different functional modules according to needs, that is, the modules or steps in the embodiments of the present application are further decomposed or combined, for example, the modules of the above embodiments can be combined into one module, or can be further split into multiple sub-modules to complete all or part of the functions described above. The names of the modules and steps involved in the embodiments of the present application are only for distinguishing the respective modules and steps, and should not be considered as improper limitation of the present application.

[0083] Those skilled in the art should be able to understand that the modules and method steps of each example described in combination with the embodiments disclosed herein can be realized by electronic hardware, computer software or a combination of both. The programs corresponding to the software modules and method steps can be placed in a random access memory (RAM), a memory, a read-only memory (ROM), an electrically programmable ROM, an electrically erasable programmable ROM, a register, a hard disk, a removable disk, a CD-ROM or any other form of storage medium known in the art. In order to clearly illustrate the interchangeability of electronic hardware and software, the composition and steps of each example have been described in the above description in general terms. Whether the functions are performed by electronic hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the present application.

Claims

1. A monitoring and warning method for hot runner, characterized in that, The method comprises: acquiring the temperature of the hot fluid in the hot runner, comparing the temperature of the hot fluid with a target temperature, and determining a temperature difference between the temperature of the hot fluid and the target temperature if the temperature of the hot fluid is less than the target temperature; controlling the heating device to heat the hot fluid in the hot runner according to the temperature difference; acquiring the real-time pressure of the heated hot fluid in the hot runner and the real-time injection speed, determining a pressure difference between the real-time pressure and a target pressure, and determining an injection speed difference between the real-time injection speed and a target injection speed; comparing the pressure difference with a preset pressure difference and comparing the injection speed difference with a preset injection speed difference; if the pressure difference is greater than the preset pressure difference and the injection speed difference is greater than the preset injection speed difference, determining that the hot fluid in the hot runner is in an abnormal injection stage to realize the monitoring and early warning of the hot runner; comparing the pressure difference with a preset pressure difference and comparing the injection speed difference with a preset injection speed difference, further comprising: if the pressure difference is greater than the preset pressure difference and the injection speed difference is less than or equal to the preset injection speed difference, determining whether a pressure difference rate between the pressure difference and the preset pressure difference is higher than a difference rate threshold value, and if the pressure difference rate is higher than the difference rate threshold value, determining that the hot fluid in the hot runner is in an abnormal injection stage; if the pressure difference is less than or equal to the preset pressure difference and the injection speed difference is greater than the preset injection speed difference, determining whether an injection difference rate between the injection speed difference and the preset injection speed difference is higher than a difference rate threshold value, and if the injection difference rate is higher than the difference rate threshold value, determining that the hot fluid in the hot runner is in an abnormal injection stage; the pressure difference rate is calculated according to the following formula: Cy=(Ys-Yo) / Yo; wherein Cy represents the pressure difference rate, Ys represents the pressure difference, and Yo represents the preset pressure difference; the injection difference rate is calculated according to the following formula: Cz=(Zs-Zo) / Zo; wherein Cz represents the injection difference rate, Zs represents the injection speed difference, and Zo represents the preset injection speed difference.

2. The monitoring and warning method for hot runner as claimed in claim 1 wherein, controlling the heating device to heat the hot fluid in the hot runner according to the temperature difference, comprising: determining the heating power of the heating device according to the temperature difference; controlling the heating device to heat the hot fluid in the hot runner according to the heating power; acquiring the real-time temperature of the hot fluid in the hot runner when heating, and adjusting the heating power according to the real-time temperature of the hot fluid to make the real-time temperature of the hot fluid reach the target temperature.

3. The monitoring and warning method for hot runner as claimed in claim 1 wherein, determining the heating power of the heating device according to the temperature difference, comprising: previously setting a first temperature difference, a second temperature difference, and a third temperature difference, which increase in turn; setting the heating power of the heating device according to the relationship between the temperature difference and the first temperature difference, the second temperature difference, and the third temperature difference; If the temperature difference is less than the first temperature difference, a heating power of the heating device is set as a first heating power P1; If the temperature difference is greater than or equal to the first temperature difference and less than the second temperature difference, the heating power of the heating device is set as a second heating power P2; If the temperature difference is greater than or equal to the second temperature difference and less than the third temperature difference, the heating power of the heating device is set as a third heating power P3; If the temperature difference is greater than or equal to the third temperature difference, the heating power of the heating device is set as a fourth heating power P4; wherein P1 4. The monitoring and warning method for hot runners as claimed in claim 1 wherein, The pressure difference is compared with a preset pressure difference, and the injection speed difference is compared with a preset injection speed difference, and the method further comprises: If the pressure difference is less than or equal to the preset pressure difference and the injection speed difference is less than or equal to the preset injection speed difference, it is determined that the hot fluid in the hot runner is in a normal injection stage.

5. The monitoring and warning method for hot runners as claimed in claim 1 wherein, The difference rate threshold is set to 25%.

6. The monitoring and warning method for hot runners as claimed in claim 1 wherein, After determining that the hot fluid in the hot runner is in an abnormal injection stage, the method further comprises: determining an abnormal injection grade of the hot fluid in the hot runner according to the pressure difference and the injection speed difference; determining a warning grade according to the abnormal injection grade and giving a warning.

7. A monitoring and warning system for hot runners for applying the monitoring and warning method for hot runners according to any one of claims 1 to 6, characterized in that The system comprises: an acquisition module configured to acquire a temperature of a hot fluid in a hot runner and real-time pressure and real-time injection speed of the hot fluid after being heated in the hot runner; a processing module configured to compare the temperature of the hot fluid with a target temperature, and if the temperature of the hot fluid is less than the target temperature, determine a temperature difference between the temperature of the hot fluid and the target temperature, and set a heating power of a heating device according to the temperature difference; the processing module is further configured to determine a pressure difference between the real-time pressure and a target pressure, and determine an injection speed difference between the real-time injection speed and a target injection speed, and compare the pressure difference with a preset pressure difference and compare the injection speed difference with a preset injection speed difference; a control module configured to control the heating device to heat the hot fluid in the hot runner according to the heating power set by the processing module; a warning module configured to determine that the hot fluid in the hot runner is in an abnormal injection stage when the pressure difference is greater than the preset pressure difference and the injection speed difference is greater than the preset injection speed difference, so as to realize monitoring and warning of the hot runner.

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