Die-casting die preheating management system

Abstract

The invention discloses a die-casting die preheating management system, which performs preheating management on a die by utilizing time before die replacement, in the preheating process, a die high-temperature oil monitoring unit is utilized to construct the internal temperature of a die main body by scanning surface temperature data of the die main body, and the internal temperature is compared with the temperature required by die-casting preheating of the die to confirm the temperature difference between the internal temperature and the temperature required by die-casting preheating; when the temperature difference is larger than a preset temperature threshold value, a signal is synchronously transmitted to a PID controller, the corresponding mold high-temperature oil heating unit or mold high-temperature oil cooling unit is further analyzed and regulated, and the heating or cooling strength is adjusted according to a real-time temperature difference feedback result in the regulation process; and after the temperature tends to be stable, PID fine adjustment is adopted to ensure that the temperature difference fluctuation is within the preset temperature threshold value, preheating can be completed, under the condition of rapid die replacement, the die temperature is kept to be higher than the use required temperature in the die replacement operation of 30 minutes, the output of die replacement or rejected workpieces after die replacement is reduced, and the cost of die castings is greatly reduced.

Description

Technical Field

[0001] This invention patent relates to the technical field of die-casting mold preheating, and specifically to a die-casting mold preheating management system. Background Art

[0002] With the popularization of the technology of integrated body die-casting, more and more die-cast structural parts products are gradually updated. Due to the relatively thin wall thickness of the structural parts products and the relatively long filling stroke of the products, the temperature difference presented by the mold temperature in the early stage causes the aluminum liquid to dissipate heat quickly, and abnormal molding quality often occurs at the distal position of the product. For this reason, it is necessary to gradually increase the mold temperature through multiple slow fillings of aluminum alloy in the die-casting process stage to achieve the dynamic balance of the temperature field. However, this process will produce a large number of defective products. The defective products in this stage are called scrap workpieces, which reduces the effective operating rate and the yield rate of the equipment, and increases the production cost of the castings.

[0003] In addition, in the die-casting mold preheating system, on small machines with a tonnage less than 1500T, due to the small size of the mold and the heat conduction of aluminum alloy, the mold temperature can be increased during 3 - 5 scrap work processes. However, for large-tonnage molds, especially die-casting machines with a tonnage exceeding 7000T, the heat absorption required for large structural part molds is several times that of small molds. If only relying on the slow filling and heating of aluminum alloy itself, about 10 processes are required. At the same time, during the slow filling process, the thermal alternation of the temperature field will affect the service life of the mold itself, and has a greater impact on the early-stage turtle cracks and the effective service life of the mold.

[0004] If the oil temperature equipment on the machine is used to preheat the mold, limited by the power of the heat-conducting oil, it takes an additional 1 - 2 hours. For large die-casting machines, each time of mold change and each time of restart operation after shutdown and shift handover require a large amount of energy consumption and time. These ineffective losses increase the cost of die-castings and reduce the competitiveness of automotive die-castings. Therefore, we have invented a quick-change mold preheating management system. By using the time before mold change to preheat the mold, with the quick-change function and self-locking function of the external fluid connecting plate, and cooperating with intelligent temperature control, the offline preheating operation is started 2 hours in advance before each mold change. Under the condition of quick mold change, the mold temperature is maintained above the required operating temperature during the 30-minute mold change operation. Through process optimization, the temperature is unified, the output of scrap workpieces after mold change or during mold change is reduced, the equipment operating rate is increased, and finally the state of 1 scrap work or 0 scrap workpieces can be achieved, greatly improving the cost of die-castings. Summary of the Invention

[0005] In view of the technical problems that the temperature of ultra-large die-casting molds rises slowly, and the thermal stress caused by a large temperature difference will affect the service life of the molds, and the repeated scrapping of workpieces will reduce the production efficiency of die-casting plants, the present invention patent provides a die-casting mold preheating management system with a mold having a fluid quick-switching function, which has temperature monitoring and regulation functions and a temperature holding function during the mold change stage. The external fluid connection plate and preheating system provided by the present invention will effectively improve the above production phenomena.

[0006] To achieve the above object, the present invention patent provides the following technical solutions: A die-casting mold preheating management system includes an external fluid connection plate, a mold body, and a management main control system. The management main control system includes a mold high-temperature oil heating unit, a mold high-temperature oil cooling unit, a mold high-temperature oil injection unit, a mold temperature monitoring unit, and a pipeline oil temperature control unit. Multiple pipeline channels are provided inside both the mold body and the external fluid connection plate, and embedded thermocouples are provided at both ends of each pipeline channel in the external fluid connection plate. The mold high-temperature oil heating unit heats and provides high-temperature heat-conducting oil through a mobile oil temperature machine, and then injects it into the mold body through the mold high-temperature oil injection unit for preliminary preheating. The mold temperature monitoring unit is provided with an infrared thermal imager and a data analysis host computer. The surface temperature data of the mold body is scanned by the infrared thermal imager and fed back to the data analysis host computer. The data analysis host computer is built-in with an identification and construction module and a comparison and analysis module. After the preliminary preheating is completed, the identification and construction module constructs the internal temperature of the mold body based on the surface temperature of the mold body, and the comparison and analysis module compares the internal temperature of the mold body with the die-casting preheating temperature of the mold and confirms the temperature difference between the two. When the temperature difference is greater than the preset temperature threshold, the temperature difference data is fed back to the pipeline oil temperature control unit. The pipeline oil temperature control unit is provided with a PID controller, which controls the oil temperature heating or cooling of the corresponding channel through further analysis according to the temperature difference feedback result. When the temperature reaches the set requirement, it prompts that the mold preheating is completed.

[0007] Preferably, the identification and construction module receives the surface temperature of the mold body transmitted by the infrared thermal imager, identifies the temperature gradient estimation value, and then calculates the internal temperature of the mold body according to its built-in algorithm. ; Among them, is the internal temperature of the mold body, is the surface temperature of the mold body, is the infrared thermal imaging temperature gradient, is the wall thickness of the mold body, is the material thermal conductivity of the mold body.

[0008] Preferably, the comparative analysis module compares the internal temperature of the mold body with the preheating temperature of the die casting mold . Among them, let be the actual required temperature for die casting of the mold, , compare the temperature difference between the two . When the temperature difference is greater than the preset temperature threshold, the data analysis host computer will feedback the temperature difference data to the pipeline oil temperature control unit at this time.

[0009] Preferably, the pipeline oil temperature control unit further analyzes and compares with . When , it indicates that the internal temperature of the mold body is too high and needs to be cooled. The pipeline oil temperature control unit opens the high-temperature oil cooling unit of the mold through a PID controller to regulate the cooling water flow, and cooperates with the auxiliary regulation of the heat transfer oil flow to control the temperature, and stops cooling after reaching the set temperature.

[0010] Preferably, when , it indicates that the internal temperature of the mold body is too low and needs to be heated. The pipeline oil temperature control unit controls to open the high-temperature oil heating unit of the mold to heat the heat transfer oil in the channel, and real-time monitors the oil temperature of the heat transfer oil through an embedded thermocouple, and stops heating after reaching the required temperature for die casting of the mold.

[0011] Preferably, the high-temperature oil cooling unit of the mold is provided with a heat exchanger, a water supply device, a water return device and a water cooling pipe. The heat exchanger is installed on the top of the external fluid connection plate, and thermistors are installed at both ends of the heat exchanger connected to the connecting pipe. The water supply device and the water return device are arranged inside the external fluid connection plate.

[0012] Preferably, the heat exchanger is respectively connected to the water supply device and the water return device through connecting pipes. The water cooling pipe is spirally wound around the outer periphery of the pipeline channel inside the external fluid connection plate, and the input port of the water cooling pipe is connected to the water supply device, and the output port of the water cooling pipe is connected to the water return device. A water limit control valve is arranged inside the water supply device.

[0013] Preferably, the high-temperature oil injection unit of the mold is provided with a manual quick-change plate, an external fluid connection plate and an external quick-change plate. One side of the manual quick-change plate is connected to a mobile oil temperature machine, and one side of the external quick-change plate is connected to the mold body. The pipeline of the mobile oil temperature machine is installed with the manual quick-change plate structure, and the manual quick-change plate, the external fluid connection plate and the external quick-change plate are connected in sequence.

[0014] Preferably, the mold body is fixedly connected to an external quick-change plate and an external fluid connection plate. The external fluid connection plate moves in matching with the die-casting mold. The mold body does not need to be preheated on the die-casting machine table, and the mold body can be preheated in the die-casting preparation area.

[0015] Preferably, the high-temperature heat-conducting oil provided by the mobile oil temperature control unit circulates inside the mold body to preheat and heat the mold. The port connectors of the external fluid connection plate and the external quick-change plate both adopt a steel spring self-locking pressure-resistant structure.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. During the preheating process of the present invention, the mold high-temperature oil monitoring unit constructs the internal temperature of the mold body by scanning the surface temperature data of the mold body, and compares it with the temperature required for die-casting mold preheating to reconfirm the temperature difference between the two. When the temperature difference is greater than the preset temperature threshold, it indicates that the preheating temperature of the mold is too low or too high. Then, the signal is synchronously transmitted to the PID controller to further analyze and control the corresponding mold high-temperature oil heating unit or mold high-temperature oil cooling unit. During the control process, the heating or cooling intensity is adjusted according to the real-time temperature difference feedback result. After the temperature tends to be stable, PID fine-tuning is used to ensure that the temperature difference fluctuation is within the preset temperature threshold.

[0017] 2. The present invention is provided with an external fluid connection plate and an external quick-change plate. The external fluid connection plate can move in matching with the die-casting mold. The mold body does not need to be preheated on the die-casting machine table, and the mold body can be preheated in the die-casting preparation area. The offline preheating operation is started 2 hours in advance before each mold change. After the temperature reaches the preheating condition, the mobile oil temperature control unit can be manually separated from the preheated mold. Since the port connectors of the external fluid connection plate and the external quick-change plate both adopt a steel spring self-locking pressure-resistant structure, one-way throttling self-locking can be achieved after the external quick-connect plate or the external fluid connection plate is separated from the heating equipment, avoiding the heat-conducting oil from losing temperature. Using the self-locking function of the interface, the mold temperature can be maintained above the required temperature during the 30-minute mold change operation. Through process optimization, the state of 1 scrap or 0 scrap parts can be finally achieved, greatly improving the cost of die-cast parts, and also meeting the technical requirements of rapid production after mold change. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is the structural block diagram of the management main control system of the present invention; Figure 2 is the schematic diagram of die-casting mold preheating connection of the present invention; Figure 3 is the schematic diagram of the connection of the external fluid connection plate of the present invention; Figure 4 is the schematic diagram of intelligent temperature control preheating of the present invention; Figure 5 Schematic diagram of the internal structure of the external fluid connection plate of the present invention patent Figure 6 is Figure 5 Enlarged schematic diagram at position A in Figure 7 is Figure 5 Enlarged schematic diagram at position B in Figure 8 Intelligent temperature control preheating flow chart of the present invention patent

[0019] Explanation of reference numerals in the drawings: 1. Mobile oil temperature machine; 2. Mold body; 3. External fluid connection plate; 4. Manual quick-change plate; 5. External quick-change plate; 6. Infrared thermal imager; 7. Data analysis host computer; 8. PID controller; 9. Heat exchanger; 10. Water supply device; 11. Water return device; 12. Water cooling pipe; 13. Water limit control valve; 14. Embedded thermocouple; 15. Thermistor Specific embodiments

[0020] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention

[0021] The embodiments of the present invention will be further described below with reference to the accompanying drawings

[0022] Embodiment: As Figures 1-3 shown, the present invention provides a die-casting mold preheating management system, including a mold body 2, an external fluid connection plate 3 and a management main control system. The management main control system includes a mold high-temperature oil heating unit, a mold high-temperature oil cooling unit, a mold high-temperature oil injection unit, a mold temperature monitoring unit and a pipeline oil temperature control unit. Multiple groups of pipeline channels are provided inside both the mold body 2 and the external fluid connection plate 3 Furthermore, the mold high-temperature oil injection unit is provided with a manual quick-change plate 4, an external fluid connection plate 3 and an external quick-change plate 5. The mold body 2 is fixedly connected to the external fluid connection plate 3 through the external quick-change plate 5. Among them, one side of the manual quick-change plate 4 is connected to a mobile oil temperature machine 1, one side of the external quick-change plate 3 is connected to the mold body 2, the pipeline of the mobile oil temperature machine 1 is installed with the structure of the manual quick-change plate 4, and the manual quick-change plate 4, the external fluid connection plate 3 and the external quick-change plate 5 are connected in sequence Specifically, the external fluid connection plate 3 moves in matching with the die-casting mold. The mold body 2 does not need to be preheated on the die-casting machine table. The mold body 2 can be preheated in the die-casting preparation area. The mold high-temperature oil heating unit is heated by the mobile oil temperature machine 1 and provides high-temperature heat-conducting oil, which is then injected into the interior of the mold body 2 through the mold high-temperature oil injection unit for preliminary preheating and heating. The port connectors of both the external fluid connection plate 3 and the external quick-change plate 5 adopt a steel spring self-locking pressure-resistant structure. After the preheating is completed, due to the fluid self-locking device of the connector, when the external quick-connect plate 5 or the external fluid connection plate 3 is separated from the heating device, one-way throttling self-locking is achieved, avoiding the heat loss of the heat-conducting oil.

[0023] As Figures 5-7 shown, multiple groups of pipeline channels can be arranged inside the external fluid connection plate 3. Each group of pipeline channels is composed of multiple groups of tree-shaped flow channels connected together. Embedded thermocouples 14 are arranged at both port ends of each group of pipeline channels. The mold high-temperature oil cooling unit is composed of a heat exchanger 9, a water supply device 10, a water return device 11 and a water-cooling pipe 12, and is arranged on the external fluid connection plate 3. The heat exchanger 9 is installed on the top of the external fluid connection plate 3. The water supply device 10 and the water return device 11 are arranged inside the external fluid connection plate 3. The heat exchanger 9 is respectively connected to the water supply device 10 and the water return device 11 through connecting pipes, and thermistors 15 are installed at both port ends of the heat exchanger 9 connected to the connecting pipes. The water-cooling pipe 12 is spirally wound around the outer periphery of the pipeline channels inside the external fluid connection plate 3, and the input port of the water-cooling pipe 12 is connected to the water supply device 10, and the output port of the water-cooling pipe 12 is connected to the water return device 11. A water limit control valve 13 is arranged inside the water supply device.

[0024] As Figure 4 、 Figure 8 shown, the mold temperature monitoring unit is provided with an infrared thermal imager 6 and a data analysis host computer 7. After the preliminary preheating is completed, the surface temperature data of the mold body 2 is scanned by the infrared thermal imager 6 and fed back to the data analysis host computer 7. The data analysis host computer 7 is built-in with an identification construction module and a comparison analysis module. Among them, the identification construction module constructs the internal temperature of the mold body 2 according to the surface temperature of the mold body 2. The comparison analysis module compares the internal temperature of the mold body 2 with the mold die-casting preheating temperature and confirms the temperature difference between the two. When the temperature difference is less than the preset temperature threshold, it indicates that the mold preheating is completed; When the temperature difference is greater than the preset temperature threshold, the temperature difference data is fed back to the pipeline oil temperature control unit. The pipeline oil temperature control unit includes a PID controller 8 arranged on the top of the external fluid connection plate 3, which can analyze whether the mold temperature of the corresponding channel is too high or too low based on the temperature difference data through further analysis, and control the oil temperature heating or cooling of the corresponding channel. When heating is required, a heating signal is transmitted to the mold high-temperature oil heating unit, and the high-temperature oil of the mold is controlled by the mold high-temperature oil heating unit to raise the temperature of the heat-conducting oil. When cooling is required, the cooling data is transmitted to the mold high-temperature oil cooling unit, and the cooling water is controlled by the mold high-temperature oil cooling unit to cool the heat-conducting oil. When the temperature reaches the set required temperature After that, it is prompted that the mold preheating is completed.

[0025] Specifically, the recognition and construction module receives the surface temperature of the mold body 2 transmitted by the infrared thermal imager 6 and recognizes and estimates the temperature gradient , where the temperature gradient represents the temperature change of the mold temperature within a unit distance, and then calculates the internal temperature of the mold body according to its built-in algorithm; ; Among them, is the internal temperature of the mold body, is the surface temperature of the mold body, is the wall thickness of the mold body, is the thermal conductivity of the material of the mold body.

[0026] Specifically, the comparison and analysis module compares the internal temperature of the mold body with the die-casting preheating temperature of the mold . Among them, , is the actual required temperature of the die-casting mold. After obtaining the temperature difference between the two, it is compared with the preset temperature threshold. The preset temperature threshold is set to 5°. When the temperature difference is less than the preset temperature threshold, it indicates that the mold preheating is completed.

[0027] Specifically, the PID controller 8 can optimize the controller performance by performing PID parameter tuning through the step response method in the early stage. The PID controller is wired-connected to the water limit control valve 13, the embedded thermocouple 14, and the thermistor 15 using analog signals, and is wirelessly connected to the variable frequency pump and the heater in the mobile oil temperature machine 1 using control signals. The temperature difference upper limit is programmed and input in the PID controller 8, and is set as the upper limit. When the temperature difference exceeds the upper limit, it indicates that the temperature of the heat-conducting oil is significantly higher or lower than ; When the temperature difference When it is greater than the preset temperature threshold, the data analysis host computer will feedback the temperature difference data to the pipeline oil temperature control unit, and the pipeline oil temperature control unit will further analyze and compare with the relationship between: When it is the case, it indicates that the temperature inside the mold body is too high and cooling treatment is required. The PID controller 8 in the pipeline oil temperature control unit receives the signal for cooling and controls the heat exchanger 9 of the mold high-temperature oil cooling unit to work, so that cooling water enters the water-cooled pipe 12 to cool the high-temperature heat-conducting oil in the pipeline channel, and simultaneously monitors the temperature monitoring data of the embedded thermocouple 14 and the thermistor 15. Then, according to the real-time temperature difference feedback result, quickly respond to adjust the valve opening of the water limit control valve 13 to control the cooling water flow rate; During the cooling treatment, when the temperature of the heat-conducting oil is significantly higher than it is the case, the PID controller 8 will control the water limit control valve 13 to be fully open and start the variable-frequency pump to run at high speed to achieve rapid cooling of the high-temperature heat-conducting oil. Synchronously collect the electrical signal changes of the embedded thermocouple 14 and the thermistor 15, identify the inlet and outlet temperatures of the heat-conducting oil in the external fluid connection plate 3 and the inlet and outlet temperatures of the cooling water in the water-cooled pipe 12, and timely adjust the valve opening of the water limit control valve 13 and the operation of the variable-frequency pump according to the temperature change to control the cooling water and heat-conducting oil flow rates. Finally, according to the real-time temperature difference feedback result, use PID fine-tuning to ensure that the temperature difference fluctuation is within the preset temperature threshold.

[0028] When it is the case, it indicates that the temperature inside the mold body is too low and heating treatment is required. The PID controller 8 in the pipeline oil temperature control unit receives the signal for heating and controls the mobile oil temperature machine 1 of the mold high-temperature oil heating unit to work, starts the variable-frequency pump and the heater, and heats the heat-conducting oil in the channel; During the heating treatment, when the temperature of the heat-conducting oil is significantly lower than it is the case, the PID controller 8 will control the variable-frequency pump to run at low speed and adjust the heater to the maximum power to achieve rapid heating of the heat-conducting oil. Synchronously collect the electrical signal change of the embedded thermocouple 14, identify the inlet and outlet temperatures of the heat-conducting oil in the external fluid connection plate 3, timely adjust the power of the heater and the operation of the variable-frequency pump according to the temperature change, and finally according to the real-time temperature difference feedback result, use PID fine-tuning to ensure that the temperature difference fluctuation is within the preset temperature threshold.

[0029] After the temperature reaches the preheating condition, the oil temperature machine can be manually separated from the preheating mold. The heat-conducting oil circulating inside the mold is enclosed inside the main body 2 of the mold under the condition of joint self-locking. At this time, the mold can maintain heat for up to 30 minutes. By using this period of time to complete the mold change operation, the technical requirement of rapid production after mold change can be achieved.

[0030] The above embodiments only express the specific implementation manners of the present invention, and the description thereof is relatively specific and detailed. However, it should not be construed as a limitation to the scope of the patent of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the inventive concept of the patent of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the patent of the present invention.

Claims

1. A die-casting mold preheating management system, comprising an external fluid connection plate, a mold body and a management main control system, characterized in that: The described management master control system includes a mold high-temperature oil heating unit, a mold high-temperature oil cooling unit, a mold high-temperature oil injection unit, a mold temperature monitoring unit, and a pipeline oil temperature control unit. Multiple groups of pipeline channels are provided inside both the mold body and the external fluid connection plate. Embedded thermocouples are provided at both ends of each pipeline channel in the external fluid connection plate. The mold high-temperature oil heating unit heats and provides high-temperature heat-conducting oil through a mobile oil temperature machine, and then injects it into the mold body through the mold high-temperature oil injection unit for preliminary preheating. The mold temperature monitoring unit is provided with an infrared thermal imager and a data analysis host computer. The surface temperature data of the mold body is scanned by the infrared thermal imager and fed back to the data analysis host computer. The data analysis host computer is built-in with an identification and construction module and a comparison and analysis module. After the preliminary preheating is completed, the identification and construction module constructs the internal temperature of the mold body based on the surface temperature of the mold body. The comparison and analysis module compares the internal temperature of the mold body with the required temperature for die-casting preheating of the mold and confirms the temperature difference between the two. When the temperature difference is greater than the preset temperature threshold, the temperature difference data is fed back to the pipeline oil temperature control unit. The pipeline oil temperature control unit is provided with a PID controller, which controls the oil temperature heating or cooling of the corresponding channel through further analysis according to the temperature difference feedback result. When the temperature reaches the set requirement, it prompts that the mold preheating is completed.

2. The preheating management system for a die-casting mold according to claim 1, wherein: The identification and construction module receives the surface temperature of the mold body transmitted by the infrared thermal imager, identifies the temperature gradient, and then calculates the internal temperature of the mold body according to its built-in algorithm. ； Among them, is the internal temperature of the mold body, is the surface temperature of the mold body, is the infrared thermal imaging temperature gradient, is the wall thickness of the mold body, is the thermal conductivity of the material of the mold body.

3. The preheating management system for a die-casting mold according to claim 1, wherein: The comparison and analysis module compares the internal temperature of the mold body with the preheating temperature of the die-casting mold and sets as the actual required temperature for die-casting of the mold. Then, it compares the temperature difference between the two . When the temperature difference is greater than the preset temperature threshold, the data analysis host computer feeds back the temperature difference data to the pipeline oil temperature control unit at this time.

4. A preheating management system for a die-casting mold according to claim 1, characterized in that: The pipeline oil temperature control unit further analyzes and compares with the relationship between them. When this is the case, it indicates that the temperature inside the mold body is too high and cooling treatment is required. The pipeline oil temperature control unit opens the mold high-temperature oil cooling unit through a PID controller to regulate the cooling water flow, and cooperates with the auxiliary adjustment of the heat-conducting oil flow to perform temperature control. After reaching the set temperature the cooling is stopped.

5. A preheating management system for a die-casting mold according to claim 4, characterized in that: When it indicates that the temperature inside the mold body is relatively low and heating treatment is required. The pipeline oil temperature control unit controls the opening of the high-temperature oil heating unit of the mold to heat the heat-conducting oil in the channel, and the temperature of the heat-conducting oil is monitored in real time through the embedded thermocouple. After reaching the set temperature the heating is stopped.

6. The preheating management system of a die-casting mold according to claim 1, characterized in that: The mold high-temperature oil cooling unit is provided with a heat exchanger, a water supply device, a water return device, and a water-cooled pipe. The heat exchanger is installed on the top of the external fluid connection plate, and thermistors are installed at both ends of the heat exchanger connected to the connecting pipe. The water supply device and the water return device are arranged inside the external fluid connection plate.

7. The preheating management system for a die-casting mold according to claim 6, characterized in that: The heat exchanger is respectively connected to the water supply device and the water return device through connecting pipes. The water-cooled pipe is spirally wound around the outer periphery of the pipeline channel inside the external fluid connection plate, and the input port of the water-cooled pipe is connected to the water supply device, and the output port of the water-cooled pipe is connected to the water return device. A water limit control valve is provided inside the water supply device.

8. A preheating management system for a die-casting mold according to claim 1, characterized in that: The mold high-temperature oil injection unit is provided with a manual quick-change plate, an external fluid connection plate, and an external quick-change plate. One side of the manual quick-change plate is connected to a mobile oil temperature machine, and one side of the external quick-change plate is connected to the mold body. The pipeline of the mobile oil temperature machine is installed with the manual quick-change plate structure, and the manual quick-change plate, the external fluid connection plate, and the external quick-change plate are connected in sequence.

9. The preheating management system for a die-casting mold according to claim 8, characterized in that: The high-temperature heat-conducting oil provided by the mobile oil temperature machine circulates inside the mold body to preheat and heat the mold. The mold body is fixedly connected to the external fluid connection plate through the external quick-change plate. The external fluid connection plate moves with the die-casting mold. The mold body does not need to be preheated on the die-casting machine table, and the mold body can be preheated in the die-casting preparation area.

10. The preheating management system of a die-casting mold according to claim 9, characterized in that: The port joints of the external fluid connection plate and the external quick-change plate both adopt a steel spring self-locking pressure-resistant structure.

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