Monitoring and early warning method and system for hot runner

Abstract

The invention relates to the technical field of hot runner early warning, and discloses a monitoring and early warning method and system for a hot runner, and the method comprises the steps: obtaining the temperature of a hot fluid in the hot runner, comparing the temperature with a target temperature, and determining a temperature difference value between the temperature and the target temperature if the temperature is smaller than the target temperature; controlling a heating device to heat the hot fluid according to the temperature difference value; the real-time pressure and the real-time injection molding speed of the heated hot fluid in the hot runner are obtained, the pressure difference value between the real-time pressure and the target pressure is determined, and the injection molding speed difference value between the real-time pressure and the target injection molding speed is determined; and if the pressure difference value is larger than the preset pressure difference value and the preset injection molding speed difference value, it is determined that the hot fluid in the hot runner is in the abnormal injection molding stage, so that monitoring and early warning of the hot runner are achieved. According to the invention, the monitoring and early warning functions of the hot runner system can be comprehensively and accurately realized, and the stability and the product quality of the production process are effectively improved.

Description

Technical Field

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

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

[0003] However, although hot runner technology brings many advantages, its complexity and high temperature and high pressure working environment also bring potential risks. During long-term operation, the hot runner system may experience temperature anomalies, leakage, blockage and other faults. These problems will not only affect production efficiency, but may also cause equipment damage or even safety accidents. Therefore, real-time monitoring and early warning of hot runners are particularly important. The present invention proposes a monitoring and early warning method and system for hot runners, which aims to achieve comprehensive monitoring of the operating status of the hot runner and timely early warning. Summary of the invention

[0004] The purpose of the present invention is to provide a monitoring and early warning method and system for hot runners to solve the problem that during long-term operation, the hot runner system may have temperature anomalies, leakage, blockage and other faults, which may affect production efficiency, damage equipment and even safety accidents.

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

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

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

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

[0009] Comparing the pressure difference with a preset pressure difference, and comparing the injection speed difference with a 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 monitoring and early warning of the hot runner.

[0011] Preferably, controlling the heating device to heat the hot fluid in the hot runner according to the temperature difference comprises:

[0012] determining the heating power of the heating device according to the temperature difference;

[0013] Controlling the heating device to heat the hot fluid in the hot runner according to the heating power;

[0014] When heating is performed, the real-time temperature of the hot fluid in the hot runner is obtained, and the heating power is adjusted according to the real-time temperature of the hot fluid so that the real-time temperature of the hot fluid reaches the target temperature.

[0015] Preferably, determining the heating power of the heating device according to the temperature difference includes:

[0016] Presetting a first temperature difference, a second temperature difference and a third temperature difference, wherein the first temperature difference, the second temperature difference and the third temperature difference increase in sequence;

[0017] 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;

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

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

[0020] If the temperature difference is greater than or equal to the second temperature difference, and the temperature difference is less than the third temperature difference, the heating power of the heating device is set to 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 to a fourth heating power P4; wherein P1<P2<P3<P4.

[0022] Preferably, comparing the pressure difference with a preset pressure difference, and comparing the injection speed difference with a preset injection speed difference, further comprises:

[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 the normal injection stage.

[0024] Preferably, comparing the pressure difference with a preset pressure difference, and comparing the injection speed difference with a preset injection speed difference, further comprises:

[0025] 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 the pressure difference rate between the pressure difference and the preset pressure difference is higher than a difference rate threshold, and if the pressure difference rate is higher than the difference rate threshold, determining that the hot fluid in the hot runner is in an abnormal injection stage;

[0026] 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, it is determined whether the injection difference rate between the injection speed difference and the preset injection speed difference is higher than the difference rate threshold; if the injection difference rate is higher than the difference rate threshold, 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 molding 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, and Zo represents the preset injection speed difference.

[0033] Preferably, the difference rate threshold 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 includes:

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

[0036] The warning level is determined according to the abnormal injection molding level, and a warning is issued.

[0037] The present invention also discloses a monitoring and early warning system for a hot runner, which is used to apply the above-mentioned monitoring and early warning method for a hot runner, and the system comprises:

[0038] An acquisition module is used to acquire the temperature of the hot fluid in the hot runner and the real-time pressure and real-time injection speed of the hot fluid after being heated in the hot runner;

[0039] A processing module is used to compare the temperature of the hot fluid with the target temperature, and if the temperature of the hot fluid is lower than the target temperature, determine the temperature difference between the temperature of the hot fluid and the target temperature; and set the heating power of the heating device according to the temperature difference; the processing module is also used to determine the pressure difference between the real-time pressure and the target pressure, and determine the injection speed difference between the real-time injection speed and the 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, used for controlling a heating device to heat the hot fluid in the hot runner according to the heating power set by the processing module;

[0041] The early warning module is used 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 beneficial effect of the present invention is that the present invention 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 the real-time monitoring of the temperature, real-time pressure and injection speed of the hot fluid through the integrated module design, and provide real-time and accurate data support for production operations. The present invention can obtain the temperature of the hot fluid in the hot runner in real time, and compare it with the target temperature, realize accurate monitoring and timely regulation of the hot runner, ensure that the temperature of the hot fluid is kept within a suitable range, and can automatically control the heating device to heat the hot fluid in the hot runner according to the temperature difference, improve the heating efficiency and accuracy, and avoid excessive temperature fluctuations. After the temperature is adjusted, not only the temperature is monitored, but also the real-time pressure and real-time injection speed of the heated hot fluid are obtained at the same time, and the performance of the hot runner is evaluated in many aspects. By comparing the pressure difference and the injection speed difference with the preset value, it can be found in time that the hot runner is in an abnormal injection stage, and early warning is realized to avoid the production of unqualified products. It can effectively ensure the normal operation of the hot runner and help improve the quality and consistency of injection products. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] 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 in the following description are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0044] Figure 1It is a flow chart of a monitoring and early warning method for a hot runner of the present invention.

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

[0046] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0047] like Figure 1 As shown, the present invention provides a monitoring and early warning method for a hot runner, the method comprising:

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

[0049] S2, controlling a 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 the target pressure, and determining the injection speed difference between the real-time injection speed and the 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, it is determined that the hot fluid in the hot runner is in an abnormal injection stage, so as to realize monitoring and early warning of the hot runner.

[0053] In this embodiment, the present invention aims to provide an efficient monitoring and early 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, the temperature data of the hot fluid inside the hot runner is collected in real time. The key to this step is to carefully compare the collected temperature value with the preset target temperature value. 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, and this difference will be used as the basis for subsequent heating control. Then, according to the temperature difference just calculated, the heating device will be instructed to heat the hot fluid appropriately. The purpose of this step is to ensure that the temperature of the hot fluid can rise to the target temperature quickly and smoothly, thereby ensuring the smooth progress of the injection molding process. Subsequently, the monitoring focus is turned to the real-time pressure and injection speed of the hot fluid after heating in the hot runner. These two parameters are crucial to the control of injection molding quality. The pressure difference between the real-time pressure and the target pressure, and the speed difference between the real-time injection molding speed and the target injection molding speed are calculated respectively, so as to have a comprehensive grasp of the current injection molding state. The pressure difference and speed difference just calculated are compared with the preset thresholds respectively. The purpose of this step is to determine whether these parameters are within the normal range. Any parameter exceeding the preset threshold value may mean that an abnormality has occurred in the injection molding process. Finally, a comprehensive judgment is made on the comparison results of the pressure difference and the speed difference. If both the pressure difference and the speed difference exceed the preset threshold value, the system will determine that the current injection molding stage is an abnormal injection molding stage and trigger an early warning mechanism. This mechanism may include alarm prompts, automatic adjustment of parameters, or stopping the injection molding process, etc., to prevent defects in injection molded products or damage to equipment due to abnormalities. Through the above steps, the present invention can provide a strong guarantee for the stable operation of the hot runner, effectively improve the quality and efficiency of injection molding production, and reduce production risks.

[0054] Preferably, controlling a heating device to heat the hot fluid in the hot runner according to the temperature difference comprises: 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 a real-time hot fluid temperature in the hot runner during heating, and adjusting the heating power according to the real-time hot fluid temperature so that the real-time hot fluid temperature reaches 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 method mainly includes measuring or calculating the difference between the actual temperature of the hot fluid in the current hot runner and the target temperature, 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 find the heating power that matches it by analyzing the functional relationship between the temperature difference and the heating power. This process may involve the preset and adjustment of 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 is controlled to heat 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 increases and approaches the target temperature. At the same time, during the heating process, it is necessary to monitor the temperature of the hot fluid in the hot runner in real time, that is, to obtain the real-time hot fluid temperature. This is to ensure the smooth progress of the heating process and adjust the heating power in time to prevent the temperature of the hot fluid from being too high or too low. Finally, the heating power is adjusted according to the real-time hot fluid temperature. This step is to compare the difference between the real-time hot fluid temperature and the target temperature, and adjust the heating power accordingly according to the difference. The purpose is to enable the real-time hot fluid temperature to reach the target temperature quickly and accurately, thereby ensuring the stability of the production process and the quality of the product. In general, the present invention realizes precise control of hot fluid heating by real-time monitoring of the hot fluid temperature and adjusting the heating power according to the temperature difference, which helps to improve production efficiency and product quality.

[0056] Preferably, the heating power of the heating device is determined according to the temperature difference, including: pre-setting 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 increasing in sequence; 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 to a first heating power P1; if the temperature difference is greater than or equal to the first temperature difference, and the temperature difference is less than the second temperature difference, setting the heating power of the heating device to a second heating power P2; if the temperature difference is greater than or equal to the second temperature difference, and the temperature difference is less than the third temperature difference, setting the heating power of the heating device to 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 to a fourth heating power P4; wherein, P1<P2<P3<P4.

[0057] Preferably, the pressure difference is compared with a preset pressure difference, and the injection speed difference is compared with a preset injection speed difference, and also includes: 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, then it is determined that the hot fluid in the hot runner is in a normal injection stage.

[0058] In this embodiment, the actually measured pressure difference is compared in detail with the pre-set standard pressure difference, and at the same time, the detected injection speed difference is compared and analyzed with the preset injection speed difference. This process involves not only the evaluation of the pressure difference, but also the evaluation of the injection speed difference. Specifically, if it is found in the comparison process that the actually measured pressure difference is less than or equal to the preset pressure difference, and the actually measured injection speed difference is also less than or equal to the preset injection speed difference, then it can be determined that the hot fluid in the hot runner is in the normal injection stage.

[0059] Preferably, the pressure difference is compared with a preset pressure difference, and the injection speed difference is compared with a preset injection speed difference, and further includes: 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 the pressure difference rate between the pressure difference and the preset pressure difference is higher than a difference rate threshold; if the pressure difference rate is higher than the difference rate threshold, determining that the hot fluid in the hot runner is in an abnormal injection stage.

[0060] 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, it is determined whether the injection difference rate between the injection speed difference and the preset injection speed difference is higher than the difference rate threshold; if the injection difference rate is higher than the difference rate threshold, it is determined that the hot fluid in the hot runner is in an abnormal injection stage.

[0061] In this embodiment, first, it is necessary to conduct a detailed comparative analysis of the detected real-time pressure difference and the preset pressure difference set in advance. Then, the injection speed difference measured in real time is compared with the preset injection speed difference defined in advance. When it is found that the real-time pressure difference exceeds the preset pressure difference, and the real-time injection speed difference is either less than or equal to the preset injection speed difference, it is necessary to further calculate the pressure difference rate between the pressure difference and the preset pressure difference. If this pressure difference rate exceeds the set difference rate threshold, it can be judged that the hot fluid in the hot runner is in an abnormal injection stage. On the contrary, if the real-time pressure difference is either less than or equal to the preset pressure difference, and the real-time injection speed difference exceeds the preset injection speed difference, it is also necessary to calculate the injection difference rate between the injection speed difference and the preset injection speed difference. If this injection difference rate also exceeds the set difference rate threshold, it can also be judged 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 molding 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, and Zo represents the preset injection speed difference.

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

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

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

[0071] The present invention also discloses a monitoring and early warning system for a hot runner, which is used to apply the above-mentioned monitoring and early warning method for a hot runner, such as Figure 2 As shown, the system comprises:

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

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

[0074] The control module is used 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] The early warning module is used 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.

[0076] The present 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. Specifically, the system realizes real-time monitoring of hot fluid temperature, real-time pressure and injection speed through integrated module design, providing real-time and accurate data support for production operations.

[0077] First, 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 acquisition capability enables the system to quickly respond to any subtle changes in 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 can not only 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; it can also simultaneously analyze the deviation of pressure and injection speed, and provide a scientific basis for abnormal identification of the production process through preset threshold judgment. 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, and realizes the 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 problems such as injection defects caused by temperature fluctuations.

[0080] Finally, the introduction of the early warning module has pushed the monitoring and early warning function of the system to a new height. It can quickly identify the abnormal injection stage in the hot runner and send out an early warning signal when the pressure and injection speed are abnormal at the same time. This not only helps operators to take timely measures to solve the problem, but also effectively prevents the occurrence of 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 invention, with its comprehensive, accurate and intelligent monitoring and early warning functions, provides a strong guarantee for the stable operation and efficient production of the hot runner system. The promotion 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 embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that they can still modify or replace the technical solution of the present invention with equivalents, and these modifications or equivalent replacements cannot cause the modified technical solution to deviate from the spirit and scope of the technical solution of the present invention.

[0082] The system provided in the above embodiment is only illustrated by the division of the above functional modules. In practical applications, the above functions can be assigned to different functional modules as needed, that is, the modules or steps in the embodiments of the present invention can be decomposed or combined. For example, the modules in the above embodiment can be combined into one module, or further divided 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 invention are only for distinguishing the modules or steps, and are not regarded as improper limitations of the present invention.

[0083] Those skilled in the art should be able to appreciate that the modules and method steps of each example described in conjunction with the embodiments disclosed herein can be implemented with electronic hardware, computer software or a combination of the two, and the programs corresponding to the software modules and method steps can be placed in random access memory (RAM), internal memory, read-only memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disks, removable disks, CD-ROMs, or any other form of storage medium known in the technical field. In order to clearly illustrate the interchangeability of electronic hardware and software, the composition and steps of each example have been generally described in the above description according to the function. Whether these functions are performed in 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 to exceed the scope of the present invention.

Claims

1. A monitoring and early warning method for a hot runner, characterized in that: The method comprises: Acquiring the temperature of the hot fluid in the hot runner, comparing the hot fluid temperature with a target temperature, and if the hot fluid temperature is lower than the target temperature, determining a temperature difference between the hot fluid temperature and the target temperature; Controlling the heating device to heat the hot fluid in the hot runner according to the temperature difference; Acquire the real-time pressure and real-time injection speed of the heated hot fluid in the hot runner, determine the pressure difference between the real-time pressure and the target pressure, and determine the injection speed difference between the real-time injection speed and the 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, it is determined that the hot fluid in the hot runner is in an abnormal injection stage, so as to realize monitoring and early warning of the hot runner.

2. The hot runner monitoring and early warning method according to claim 1, characterized in that: Controlling the heating device to heat the hot fluid in the hot runner according to the temperature difference includes: 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; When heating is performed, the real-time temperature of the hot fluid in the hot runner is obtained, and the heating power is adjusted according to the real-time temperature of the hot fluid so that the real-time temperature of the hot fluid reaches the target temperature.

3. The hot runner monitoring and early warning method according to claim 1, characterized in that: Determining the heating power of the heating device according to the temperature difference includes: Presetting a first temperature difference, a second temperature difference and a third temperature difference, wherein the first temperature difference, the second temperature difference and the third temperature difference increase in sequence; 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, the heating power of the heating device is set to the first heating power P1; If the temperature difference is greater than or equal to the first temperature difference, and the temperature difference is less than the second temperature difference, the heating power of the heating device is set to the second heating power P2; If the temperature difference is greater than or equal to the second temperature difference, and the temperature difference is less than the third temperature difference, the heating power of the heating device is set to the 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 to a fourth heating power P4; wherein P1<P2<P3<P4.

4. The hot runner monitoring and early warning method according to claim 1, characterized in that: 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: 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 the normal injection stage.

5. The hot runner monitoring and early warning method according to claim 4, characterized in that: 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: 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 the pressure difference rate between the pressure difference and the preset pressure difference is higher than a difference rate threshold, and if the pressure difference rate is higher than the difference rate threshold, 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, it is determined whether the injection difference rate between the injection speed difference and the preset injection speed difference is higher than the difference rate threshold; if the injection difference rate is higher than the difference rate threshold, it is determined that the hot fluid in the hot runner is in an abnormal injection stage.

6. The hot runner monitoring and early warning method according to claim 5, characterized in that: 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 value, and Yo represents the preset pressure difference value.

7. The hot runner monitoring and early warning method according to claim 5, characterized in that: The injection molding 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.

8. The hot runner monitoring and early warning method according to claim 5, characterized in that: The difference rate threshold is set to 25%.

9. The hot runner monitoring and early warning method according to claim 5, characterized in that: After determining that the hot fluid in the hot runner is abnormal during the injection stage, it also includes: Determining an abnormal injection level of the hot fluid in the hot runner according to the pressure difference and the injection speed difference; The warning level is determined according to the abnormal injection molding level, and a warning is issued.

10. A monitoring and early warning system for a hot runner, used for applying the monitoring and early warning method for a hot runner according to any one of claims 1 to 9, characterized in that: The system comprises: An acquisition module is used to acquire the temperature of the hot fluid in the hot runner and the real-time pressure and real-time injection speed of the hot fluid after being heated in the hot runner; A processing module is used to compare the temperature of the hot fluid with the target temperature, and if the temperature of the hot fluid is lower than the target temperature, determine the temperature difference between the temperature of the hot fluid and the target temperature; and set the heating power of the heating device according to the temperature difference; the processing module is also used to determine the pressure difference between the real-time pressure and the target pressure, and determine the injection speed difference between the real-time injection speed and the 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, used for controlling a heating device to heat the hot fluid in the hot runner according to the heating power set by the processing module; The early warning module is used 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.

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