Die-casting die multi-channel cooling system based on self-feedback temperature control

Abstract

The die-casting die multi-channel cooling system based on self-feedback temperature control comprises a lower die base, a die cavity is formed in the upper surface of the lower die base, four cooling assemblies are symmetrically installed in the lower die base, and the four cooling assemblies are symmetrically arranged outside the die cavity; the cooling assembly comprises a heat exchange pipe, a first electromagnetic valve, a temperature measurement node seat, a shunt pipe, a third electromagnetic valve and a branch pipeline; the heat exchange tube is bent in a continuous S shape. When the cooling liquid reaches the first temperature measurement node seat, the temperature sensor monitors the temperature of the cooling liquid in the heat exchange tube at the node position, and when the temperature exceeds a rated value, the first electromagnetic valve at the node position is closed, the second electromagnetic valve is opened, and the third electromagnetic valve is opened; and at the moment, the cooling liquid with the temperature exceeding the rated value in the heat exchange pipe sequentially flows into the discharging pipe and the collecting pipe and then is discharged from the liquid discharging pipe, and new cooling liquid flows into the branch pipeline from the flow dividing pipe and then continuously flows downwards after flowing into the heat exchange pipe.

Description

Technical Field

[0001] The present invention relates to a cooling system, specifically a multi-channel cooling system for die-casting molds based on self-feedback temperature control, belonging to the technical field of die-casting mold cooling systems. Background Art

[0002] A die-casting mold is a metal mold used for die-casting, mainly for producing die-castings. It is a tool that fills the mold cavity with liquid or semi-liquid metal at high speed under high pressure and quickly solidifies under pressure to obtain castings. During the die-casting operation, a cooling system is often required for cooling because, during die-casting, the high-temperature metal liquid injected into the mold cavity will quickly transfer heat, causing the mold temperature to rise sharply. This not only affects the solidification speed and crystal structure of the casting, resulting in defects such as porosity, shrinkage cavities, and cracks in the casting, but also generates thermal stress due to local overheating of the mold, accelerating the wear and deformation of the mold and shortening the service life of the mold. And the cooling system has the following functions:

[0003] I. Controlling the mold temperature

[0004] Maintaining a constant temperature: During die-casting, the mold will quickly heat up due to the injection of metal liquid. The cooling system takes away the heat of the mold through a circulating cooling medium (such as water or heat-conducting oil), thereby maintaining the mold within a constant temperature range;

[0005] Avoiding temperature fluctuations: Fluctuations in the mold temperature will directly affect the quality and dimensional accuracy of the casting. The cooling system can ensure the stability of the mold temperature and reduce casting defects caused by temperature fluctuations.

[0006] II. Improving the quality of the casting

[0007] Improving the casting structure: An appropriate cooling rate helps the casting form a uniform and dense microstructure, improving the mechanical properties and corrosion resistance of the casting;

[0008] Reducing defects: By controlling the mold temperature, the cooling system can reduce defects such as porosity, shrinkage cavities, and cracks in the casting, improving the surface quality and internal quality of the casting.

[0009] III. Enhancing production efficiency

[0010] Shortening the cooling time: An efficient cooling system can quickly reduce the mold temperature to an appropriate range, thereby shortening the cooling time of the casting and increasing the production rhythm;

[0011] Reducing production interruptions: The constancy of the mold temperature reduces production interruptions and mold damage caused by temperature fluctuations, improving the continuity and stability of production.

[0012] IV. Prolonging the mold life

[0013] Reducing thermal stress: A reasonable cooling system can reduce the thermal stress of the die during die casting, reducing the risk of die deformation and cracking;

[0014] Reducing wear: The constancy of the die temperature helps to reduce the friction and wear between the die and the casting, thereby extending the service life of the die.

[0015] In most cases, the existing die-casting die cooling system mainly relies on the heat exchange tube for heat exchange to cool the die. This cooling method can indeed play a cooling role to a certain extent, ensuring that the die-casting die can maintain a relatively stable temperature in a high-temperature working environment. However, the temperature of the die-casting die is usually high during operation. When the flowing coolant contacts the surface of the die-casting die in a high-temperature state, it will inevitably absorb the heat released by the die, resulting in a gradual increase in the temperature of the coolant itself. As the coolant continues to flow in the cooling system, its temperature keeps rising, and the temperature difference with the die gradually shrinks, thereby making the cooling effect of the coolant become worse and worse during the flow process, affecting the quality of the casting and the production efficiency;

[0016] Therefore, a multi-channel cooling system for die-casting dies based on self-feedback temperature control is proposed. Summary of the Invention

[0017] In view of this, the present invention provides a multi-channel cooling system for die-casting dies based on self-feedback temperature control to solve or alleviate the technical problems existing in the prior art and at least provide a beneficial option.

[0018] The technical solution of the embodiment of the present invention is implemented as follows: A multi-channel cooling system for die-casting dies based on self-feedback temperature control includes a lower die base, a die cavity is provided on the upper surface of the lower die base, and four cooling components are symmetrically installed inside the lower die base, and the four cooling components are symmetrically arranged outside the die cavity;

[0019] The cooling component includes a heat exchange tube, a first solenoid valve, a temperature measurement node seat, a temperature sensor, a second solenoid valve, a discharge pipe, a manifold pipe, a drain pipe, a shunt pipe, a third solenoid valve and a branch pipe;

[0020] The heat exchange tube is continuously bent in an S shape, the temperature measurement node seats are equidistantly installed on the outer side wall of the heat exchange tube, the temperature sensors are installed on the outer side wall of the temperature measurement node seats, the first solenoid valves are equidistantly installed on the outer side wall of the heat exchange tube, the top end of the shunt pipe is communicated with the heat exchange tube, both ends of the branch pipe are respectively communicated with the heat exchange tube and the shunt pipe, the bottom end of the manifold pipe is communicated with the drain pipe, the drain pipe is communicated with the bottom end of the heat exchange tube, both ends of the discharge pipe are respectively communicated with the heat exchange tube and the manifold pipe, the second solenoid valve is installed on the outer side wall of the discharge pipe, and the third solenoid valve is installed on the outer side wall of the branch pipe.

[0021] Further preferably, the temperature measuring node seat, the discharge pipe, the first solenoid valve and the branch pipe are all installed on the horizontal pipe of the heat exchange pipe and arranged in sequence from left to right.

[0022] Further preferably, a one-way valve is installed on the outer side wall of the branch pipe. The one-way valve is located at one end of the branch pipe close to the heat exchange pipe, and the third solenoid valve is located at one end of the branch pipe close to the shunt pipe.

[0023] Further preferably, the cooling assembly further includes a variable frequency water pump, a pressure transmitter, a connecting pipe, a filter assembly and a liquid inlet pipe;

[0024] The pressure transmitter is installed on the outer side wall of the heat exchange pipe. One end of the connecting pipe is communicated with one end of the filter assembly, the liquid inlet pipe is communicated with the other end of the filter assembly, and the other end of the connecting pipe is communicated with the water inlet of the variable frequency water pump.

[0025] Further preferably, the water outlet of the variable frequency water pump is communicated with the top end of the heat exchange pipe, and the variable frequency water pump is installed on the outer side wall of the lower mold base.

[0026] Further preferably, a controller is installed on the outer side wall of the lower mold base.

[0027] Further preferably, the filter assembly includes a gland, a spring, a filter cartridge, a gasket and a housing;

[0028] The gland is threadedly connected to the outer side wall of the housing, and the filter cartridge, the gasket and the spring are all located inside the housing.

[0029] Further preferably, the outer side wall of the filter cartridge is fitted into the inner side wall of the housing, and both sides of the gasket are respectively attached to the filter cartridge and the housing.

[0030] Further preferably, one end of the spring abuts against the side of the filter cartridge away from the gasket, and the other end of the spring abuts against the gland.

[0031] Further preferably, a fixed disk is installed on one side of the housing. The fixed disk is communicated with the end of the connecting pipe away from the variable frequency water pump. A connecting disk is fixedly connected to the outer side wall of the gland, and a liquid inlet pipe is installed on one side of the connecting disk.

[0032] Due to the adoption of the above technical solutions in the embodiments of the present invention, it has the following advantages:

[0033] When the coolant reaches the first temperature measurement node seat, the temperature sensor monitors the temperature of the coolant in the heat exchange tube at this node position. When the temperature exceeds the rated value, the first solenoid valve at this node position closes, the second solenoid valve opens, and the third solenoid valve opens. Then, the coolant with a temperature exceeding the rated value in the heat exchange tube flows into the discharge pipe and the confluence pipe in sequence, and then is discharged from the drain pipe. The new coolant flows into the branch pipe from the shunt pipe, then flows into the heat exchange tube and continues to flow downward. At this time, the high-temperature coolant is discharged, and the new coolant enters the heat exchange tube to flow and exchange heat. At the next node, the temperature of the coolant in the heat exchange tube can be measured again. Compared with the prior art, by setting node-type temperature measurement and discharging and replacing the coolant, the coolant in the heat exchange tube can always be maintained at a lower temperature, thereby ensuring the cooling effect on the mold and not affecting the quality and production efficiency of the casting.

[0034] The above summary is only for the purpose of the specification and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments, and features described above, further aspects, embodiments, and features of the present invention will be readily apparent by reference to the drawings and the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] 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 required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0036] Figure 1 It is a structural diagram of a multi-channel cooling system for a die-casting mold based on self-feedback temperature control according to the present invention;

[0037] Figure 2 It is a schematic diagram of the position distribution of four cooling components according to the present invention;

[0038] Figure 3 It is a structural diagram of a cooling component according to the present invention;

[0039] Figure 4 It is a schematic diagram of the installation positions of the discharge pipe and the branch pipe according to the present invention;

[0040] Figure 5 It is a structural diagram of a filter component according to the present invention;

[0041] Figure 6 It is an exploded view of the structure of the filter component according to the present invention.

[0042] Reference numerals: 101, cooling assembly; 11, variable frequency water pump; 12, heat exchange tube; 13, first solenoid valve; 14, temperature measurement node seat; 15, temperature sensor; 16, second solenoid valve; 17, discharge pipe; 18, manifold pipe; 19, drain pipe; 20, shunt pipe; 21, third solenoid valve; 22, branch pipe; 23, check valve; 24, pressure transmitter; 25, connecting pipe; 26, filter assembly; 27, inlet pipe; 28, controller; 31, lower die holder; 32, die cavity; 41, connecting plate; 42, gland; 43, spring; 44, filter cartridge; 45, gasket; 46, housing; 47, fixing plate. Detailed implementation manners

[0043] In the following text, only some exemplary embodiments are simply described. As those skilled in the art can recognize, the described embodiments can be modified in various different ways without departing from the spirit or scope of the present invention. Therefore, the drawings and the description are considered to be exemplary in nature rather than restrictive.

[0044] The embodiments of the present invention will be described in detail below with reference to the drawings.

[0045] As Figures 1-6 shown, an embodiment of the present invention provides a multi-channel cooling system for a die-casting mold based on self-feedback temperature control, including a lower die holder 31. A die cavity 32 is formed on the upper surface of the lower die holder 31. Four cooling assemblies 101 are symmetrically installed inside the lower die holder 31, and the four cooling assemblies 101 are symmetrically arranged outside the die cavity 32.

[0046] The cooling assembly 101 includes a heat exchange tube 12, a first solenoid valve 13, a temperature measurement node seat 14, a temperature sensor 15, a second solenoid valve 16, a discharge pipe 17, a manifold pipe 18, a drain pipe 19, a shunt pipe 20, a third solenoid valve 21, and a branch pipe 22.

[0047] The heat exchange tube 12 is continuously bent in an S shape. The temperature measurement node seats 14 are equidistantly installed on the outer side wall of the heat exchange tube 12, and the temperature sensor 15 is installed on the outer side wall of the temperature measurement node seat 14. Thus, the temperature of the coolant in the heat exchange tube 12 at this node position can be monitored through the temperature sensor 15. When the temperature exceeds the rated value, it indicates that the temperature difference between the coolant and the mold is small, and thus the subsequent cooling effect on the mold becomes smaller and smaller. Then, the coolant can be discharged and new coolant can be injected. When the temperature does not exceed the rated value, the coolant continues to flow, and the temperature of the coolant is measured again at the next temperature measurement node.

[0048] The temperature measurement node seat 14 is made of copper material, which has good heat conduction effect to ensure the accuracy of temperature measurement. The model of the temperature sensor 15 is: NTCALUG03A103G, and the probe of the temperature sensor 15 is inserted into the interior of the temperature measurement node seat 14.

[0049] The first solenoid valve 13 is installed at equal intervals on the outer side wall of the heat exchange tube 12. The top end of the shunt pipe 20 is communicated with the heat exchange tube 12. Both ends of the branch pipe 22 are respectively communicated with the heat exchange tube 12 and the shunt pipe 20. The bottom end of the confluence pipe 18 is communicated with the liquid discharge pipe 19. The liquid discharge pipe 19 is communicated with the bottom end of the heat exchange tube 12. Both ends of the discharge pipe 17 are respectively communicated with the heat exchange tube 12 and the confluence pipe 18. The second solenoid valve 16 is installed on the outer side wall of the discharge pipe 17. The third solenoid valve 21 is installed on the outer side wall of the branch pipe 22. When the coolant flows in the heat exchange tube 12, it absorbs the heat of the lower mold base 31. When it reaches the first temperature measurement node seat 14, the temperature sensor 15 monitors the temperature of the coolant in the heat exchange tube 12 at this node position. When the temperature exceeds the rated value, the first solenoid valve 13 at this node position closes, the second solenoid valve 16 opens, and the third solenoid valve 21 opens. Then, the coolant in the heat exchange tube 12 with a temperature exceeding the rated value flows into the discharge pipe 17 and the confluence pipe 18 in sequence, and then is discharged from the liquid discharge pipe 19. The new coolant flows from the shunt pipe 20 into the branch pipe 22, and then flows into the heat exchange tube 12 and continues to flow downward;

[0050] At this time, the high-temperature coolant is discharged, and the new coolant enters the heat exchange tube 12 to flow and exchange heat. At the next node, the temperature of the coolant in the heat exchange tube 12 can be measured again;

[0051] By setting node-type temperature measurement and discharging and replacing the coolant, the coolant in the heat exchange tube 12 can always be maintained at a relatively low temperature, thereby ensuring the cooling effect on the mold and not affecting the quality and production efficiency of the casting.

[0052] In one embodiment, the temperature measurement node seat 14, the discharge pipe 17, the first solenoid valve 13, and the branch pipe 22 are all installed on the horizontal pipe of the heat exchange tube 12 and are arranged in sequence from left to right. Then, when the first solenoid valve 13 closes, the coolant in the heat exchange tube 12 can enter the discharge pipe 17, and new coolant can be injected into the heat exchange tube 12 through the branch pipe 22.

[0053] In one embodiment, a one-way valve 23 is installed on the outer side wall of the branch pipe 22. The one-way valve 23 is located at one end of the branch pipe 22 close to the heat exchange tube 12, and the third solenoid valve 21 is located at one end of the branch pipe 22 close to the shunt pipe 20. By setting the one-way valve 23, the coolant in the heat exchange tube 12 can be prevented from flowing back into the branch pipe 22.

[0054] In one embodiment, the cooling assembly 101 further includes a variable-frequency water pump 11, a pressure transmitter 24, a connecting pipe 25, a filter assembly 26, and a liquid inlet pipe 27;

[0055] The pressure transmitter 24 is installed on the outer side wall of the heat exchange tube 12. One end of the connecting pipe 25 is communicated with one end of the filter assembly 26, the liquid inlet pipe 27 is communicated with the other end of the filter assembly 26, the other end of the connecting pipe 25 is communicated with the water inlet of the variable frequency water pump 11, and the water outlet of the variable frequency water pump 11 is communicated with the top end of the heat exchange tube 12. The variable frequency water pump 11 is installed on the outer side wall of the lower die base 31. When the cooling system is working, under the action of the variable frequency water pump 11, the coolant flows into the filter assembly 26 through the liquid inlet pipe 27. The filter assembly 26 can filter the impurities in the coolant to ensure the cleanliness of the coolant, and then the coolant flows into the interior of the heat exchange tube 12.

[0056] In one embodiment, a controller 28 is installed on the outer side wall of the lower die base 31. The signal terminals of the controller 28 are respectively connected to the signal terminals of the variable frequency water pump 11, the first solenoid valve 13, the temperature sensor 15, the second solenoid valve 16, and the third solenoid valve 21. The controller 28 controls the working states of the first solenoid valve 13, the second solenoid valve 16, and the third solenoid valve 21 respectively according to the signals sent by the temperature sensor 15.

[0057] The model of the controller 28 is: OHR-PR10;

[0058] The self-feedback temperature control system consists of a sensor, an intelligent control unit, and an actuator. The sensor includes the temperature sensors 15 at each node position. The intelligent control unit includes the controller 28. The actuator includes the first solenoid valve 13, the second solenoid valve 16, and the third solenoid valve 21.

[0059] The working steps of the self-feedback temperature control system include:

[0060] I. System initialization

[0061] (1) Hardware initialization

[0062] Sensor initialization

[0063] After the power-on, the temperature sensor 15 performs self-check to check whether the sensor is working properly, including checking whether the power supply of the sensor is stable, whether the signal output is normal, etc. The temperature sensor 15 is calibrated, and according to the preset calibration parameters, the measurement accuracy of the sensor is adjusted to ensure that the measured temperature value is accurate.

[0064] Intelligent control unit initialization

[0065] After the controller 28 is started, internal hardware self-check is performed, including checking whether hardware modules such as the CPU, memory, and storage are normal, and loading the preset control algorithms and parameters. These algorithms and parameters are preset according to the cooling requirements of the die-casting mold and the characteristics of the coolant, such as temperature rated values, control logic of solenoid valves, etc.

[0066] Actuator Initialization

[0067] After power-on, the first solenoid valve 13, the second solenoid valve 16, and the third solenoid valve 21 are set to their initial states, usually the closed state, waiting for instructions from the controller. Check whether the drive circuits of the solenoid valves are normal to ensure that the solenoid valves can be opened and closed normally.

[0068] (2) Software Initialization

[0069] Establish a Communication Connection

[0070] The controller 28 establishes a communication connection with the temperature sensor 15 to ensure that temperature data can be obtained in real time. The communication method can be wired or wireless, such as RS485, CAN bus, or wireless communication module, etc. The controller 28 establishes a control connection with the first solenoid valve 13, the second solenoid valve 16, and the third solenoid valve 21 to ensure that control instructions can be sent accurately.

[0071] Initialize Variables and Data Structures

[0072] Define variables for storing temperature data and variables for recording the states of solenoid valves, and establish a data structure for storing historical temperature data and system operation status information for subsequent analysis and troubleshooting.

[0073] II. Temperature Data Acquisition

[0074] (1) Periodic Acquisition

[0075] The temperature sensor 15 collects the temperature of the coolant in the heat exchange tube 12 at the location of the node according to a preset sampling period (once per second). The selection of the sampling period needs to consider the real-time requirements of the system and the data processing ability comprehensively. An overly short sampling period will increase the system burden, and an overly long sampling period may lead to untimely temperature control.

[0076] (2) Data Transmission

[0077] The collected temperature data is transmitted to the controller 28 through the communication interface. During the transmission process, in order to ensure the accuracy of the data, methods such as checksum and cyclic redundancy check (CRC) can be used for data verification to prevent errors in the data during transmission.

[0078] III. Temperature Data Processing and Analysis

[0079] (1) Data Filtering

[0080] After the controller 28 receives the temperature data, it first performs filtering to remove noise interference. Common filtering algorithms include mean filtering, median filtering, and Kalman filtering, etc. For example, when using mean filtering, the average value of consecutive N sampling data is taken as the current effective temperature value, and the value of N can be adjusted according to the actual situation.

[0081] (II) Temperature Comparison

[0082] The filtered temperature value is compared with the preset rated temperature value. The rated temperature value is preset according to the cooling requirements of the die-casting mold and the performance of the coolant. For example, it is set to 80 °C. If the current temperature value exceeds the rated temperature value, the corresponding control logic is triggered; if the current temperature value does not exceed the rated temperature value, the temperature monitoring continues.

[0083] IV. Control Decision and Execution

[0084] (I) Situation of Exceeding the Rated Temperature

[0085] Decision Making

[0086] When the controller 28 determines that the current temperature value exceeds the rated temperature value, it immediately makes a control decision, that is, closes the first solenoid valve 13 at this node position, and opens the second solenoid valve 16 and the third solenoid valve 21.

[0087] Instruction Sending

[0088] The controller 28 sends control instructions to the first solenoid valve 13, the second solenoid valve 16, and the third solenoid valve 21 through the control interface. The instructions are encoded using a specific communication protocol to ensure that the solenoid valves can accurately identify and execute them.

[0089] Execution Action

[0090] After receiving the closing instruction, the first solenoid valve 13 quickly closes to prevent the coolant with too high temperature in the heat exchange tube 12 from continuing to flow.

[0091] After receiving the opening instructions, the second solenoid valve 16 and the third solenoid valve 21 are opened simultaneously. At this time, the coolant with too high temperature in the heat exchange tube 12 flows into the discharge pipe 17 and the confluence pipe 18 in sequence, and then is discharged from the drain pipe 19.

[0092] At the same time, new coolant flows from the shunt pipe 20 into the branch pipe 22, then into the heat exchange tube 12 and continues to flow downward to realize the update of the coolant.

[0093] (II) Situation of Not Exceeding the Rated Temperature

[0094] If the current temperature value does not exceed the rated temperature value, the controller 28 continues to monitor the temperature data without sending any control instructions. The first solenoid valve 13 remains open, and the second solenoid valve 16 and the third solenoid valve 21 remain closed to maintain the normal operation of the cooling system.

[0095] V. Status Monitoring and Feedback

[0096] (I) Solenoid Valve Status Monitoring

[0097] The controller 28 monitors the status of the first solenoid valve 13, the second solenoid valve 16, and the third solenoid valve 21 in real time, and determines whether the solenoid valves are normally opened or closed by reading the feedback signals of the solenoid valves or detecting the status of the drive circuits. If it is found that the status of the solenoid valves is abnormal, such as not operating according to the instructions, the controller 28 will issue an alarm signal and take corresponding fault handling measures.

[0098] (II) Coolant Flow Status Monitoring

[0099] The flow status of the coolant can be monitored by installing a flow sensor or other means to ensure that the new coolant can flow into the heat exchange tube 12 normally and the coolant with too high temperature can be discharged smoothly. If abnormal coolant flow is detected, such as too small flow or interruption, the controller 28 will adjust the status of the solenoid valves in time or issue an alarm signal.

[0100] (III) Temperature Feedback Regulation

[0101] After the coolant is updated, the temperature sensor 15 continues to monitor the temperature of the coolant in the heat exchange tube 12. If the temperature still exceeds the rated value, the controller 28 will analyze and make decisions again, and may need to adjust the control strategy, such as increasing the coolant flow or further optimizing the control logic of the solenoid valves.

[0102] VI. Fault Handling and Alarm

[0103] (I) Fault Detection

[0104] The system has a fault detection function and can monitor the operating status of sensors, controllers, and actuators in real time. For example, if the temperature sensor 15 fails and causes abnormal temperature data, the controller 28 will detect this fault; if the solenoid valve has faults such as jamming or leakage, the controller 28 can also find them through status monitoring.

[0105] (II) Fault Handling

[0106] When a fault is detected, the controller 28 will take corresponding handling measures according to the type of fault. For example, if a certain temperature sensor 15 fails, the controller 28 can temporarily ignore the data of this sensor and use the temperature data of other nodes for control decisions; if a certain solenoid valve fails, the controller 28 will try to resend the control instruction. If the attempts are ineffective after multiple tries, an alarm signal will be issued and corresponding safety measures will be taken, such as stopping the operation of the die-casting mold to prevent damage to the mold due to a cooling system failure.

[0107] (III) Alarm mechanism

[0108] The system is set with multiple alarm methods, such as audible and visual alarms, SMS alarms, etc. When a fault occurs, the controller 28 will trigger the alarm mechanism to notify the operator for handling in a timely manner. The alarm information includes detailed information such as the type of fault, the location of the fault, and the occurrence time, which is convenient for the operator to troubleshoot and repair the fault.

[0109] VII. System optimization and adaptive adjustment

[0110] (I) Data analysis and mining

[0111] The controller 28 regularly analyzes and mines the historical temperature data, solenoid valve status data, and system operation status information. Through data analysis, understand the operation rules and characteristics of the cooling system, and identify possible problems and optimization points.

[0112] (II) Adaptive adjustment of parameters

[0113] According to the data analysis results, the controller 28 can adaptively adjust the control parameters, such as the temperature rated value, sampling period, control logic of the solenoid valve, etc. For example, if it is found that the temperature fluctuation of a certain node is large, the temperature rated value or sampling period of this node can be appropriately adjusted to improve the accuracy and stability of temperature control.

[0114] (III) Model optimization

[0115] Continuously optimize the control algorithm and model to improve the response speed and control effect of the system. Advanced control theories and methods, such as fuzzy control, neural network control, etc., can be adopted to optimize the self-feedback temperature control system so that it can better adapt to different die-casting processes and cooling requirements.

[0116] VIII. System stop and shutdown

[0117] (I) Normal stop

[0118] When the die-casting mold stops working, the controller 28 receives a stop instruction and sequentially closes the first solenoid valve 13, the second solenoid valve 16, and the third solenoid valve 21 to stop the flow of the coolant. At the same time, the operating state data and historical data of the system are saved for subsequent analysis and reference.

[0119] (II) Emergency Stop

[0120] In case of an emergency, such as equipment failure, safety accident, etc., the operator can press the emergency stop button. After the controller 28 receives the emergency stop signal, it immediately closes all solenoid valves, stops the operation of the cooling system, and issues an alarm signal to ensure the safety of the equipment and personnel.

[0121] Through the above detailed algorithm steps, the self-feedback temperature control system can achieve precise control of the coolant temperature in the cooling system of the die-casting mold, effectively solve the problem that the cooling effect deteriorates due to the increase in the coolant temperature in the existing cooling system, improve the cooling efficiency and quality of the die-casting mold, and extend the service life of the mold.

[0122] In one embodiment, the filter assembly 26 includes a gland 42, a spring 43, a filter cartridge 44, a gasket 45, and a housing 46;

[0123] The gland 42 is threadedly connected to the outer sidewall of the housing 46. The filter cartridge 44, the gasket 45, and the spring 43 are all located inside the housing 46. The outer sidewall of the filter cartridge 44 is fitted into the inner sidewall of the housing 46. The two sides of the gasket 45 are respectively in contact with the filter cartridge 44 and the housing 46. One end of the spring 43 abuts against the side of the filter cartridge 44 away from the gasket 45, and the other end of the spring 43 abuts against the gland 42. By pushing the spring 43 through the gland 42, the spring 43 presses the filter cartridge 44, which can make the filter cartridge 44 fit tightly with the gasket 45 and enhance the structural stability;

[0124] The filter assembly 26 is of a detachable structure. When it is necessary to take out the filter cartridge 44 for cleaning, unscrew the gland 42, and at this time, the spring 43 and the filter cartridge 44 can be taken out for cleaning the filter cartridge 44.

[0125] In one embodiment, a fixed disk 47 is installed on one side of the housing 46. The fixed disk 47 is communicated with the end of the connecting pipe 25 away from the variable-frequency water pump 11. A connecting disk 41 is fixedly connected to the outer sidewall of the gland 42. An inlet pipe 27 is installed on one side of the connecting disk 41, which facilitates the installation and connection of the filter assembly 26 through the fixed disk 47 and the connecting disk 41.

[0126] When the present invention is in operation: under the action of the variable-frequency water pump 11, the coolant flows into the filter assembly 26 through the liquid inlet pipe 27. The filter assembly 26 can filter impurities in the coolant to ensure the cleanliness of the coolant. Then the coolant flows into the interior of the heat exchange tube 12. When the coolant flows in the heat exchange tube 12, it absorbs the heat of the lower die base 31. When it reaches the first temperature measurement node base 14, the temperature sensor 15 monitors the temperature of the coolant in the heat exchange tube 12 at this node position. When the temperature exceeds the rated value, the first solenoid valve 13 at this node position closes, the second solenoid valve 16 opens, and the third solenoid valve 21 opens. Then the coolant with a temperature exceeding the rated value in the heat exchange tube 12 flows into the discharge pipe 17 and the confluence pipe 18 in sequence, and then is discharged from the liquid discharge pipe 19. The new coolant flows into the branch pipe 22 from the shunt pipe 20, and then flows into the heat exchange tube 12 and continues to flow downward; at this time, the high-temperature coolant is discharged, and the new coolant enters the heat exchange tube 12 to flow and exchange heat. At the next node, the temperature of the heat exchange tube 12 can be measured again;

[0127] Compared with the prior art, by setting node-type temperature measurement and discharging and replacing the coolant, the present invention can keep the coolant in the heat exchange tube 12 at a relatively low temperature all the time, thereby ensuring the cooling effect on the mold and not affecting the quality and production efficiency of the casting.

[0128] The above is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of various changes or substitutions, and these should all be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claimed rights.

Claims

1. A multi-channel cooling system for a die-casting mold based on self-feedback temperature control, including a lower mold base (31), characterized in that: The upper surface of the lower die base (31) is provided with a die cavity (32), and four cooling components (101) are symmetrically installed inside the lower die base (31), and the four cooling components (101) are symmetrically arranged outside the die cavity (32); The cooling component (101) includes a heat exchange tube (12), a first solenoid valve (13), a temperature measuring node seat (14), a temperature sensor (15), a second solenoid valve (16), a discharge pipe (17), a manifold pipe (18), a drain pipe (19), a shunt pipe (20), a third solenoid valve (21) and a branch pipe (22); The heat exchange tube (12) is continuously bent in an S shape, the temperature measuring node seats (14) are equidistantly installed on the outer side wall of the heat exchange tube (12), the temperature sensors (15) are installed on the outer side wall of the temperature measuring node seats (14), the first solenoid valves (13) are equidistantly installed on the outer side wall of the heat exchange tube (12), the top end of the shunt pipe (20) is communicated with the heat exchange tube (12), both ends of the branch pipe (22) are respectively communicated with the heat exchange tube (12) and the shunt pipe (20), the bottom end of the manifold pipe (18) is communicated with the drain pipe (19), the drain pipe (19) is communicated with the bottom end of the heat exchange tube (12), both ends of the discharge pipe (17) are respectively communicated with the heat exchange tube (12) and the manifold pipe (18), the second solenoid valve (16) is installed on the outer side wall of the discharge pipe (17), and the third solenoid valve (21) is installed on the outer side wall of the branch pipe (22).

2. The multi-channel cooling system for a die-casting mold based on self-feedback temperature control according to claim 1, wherein: The temperature measuring node seats (14), the discharge pipe (17), the first solenoid valves (13) and the branch pipes (22) are all installed on the transverse pipes of the heat exchange tube (12) and are arranged in sequence from left to right.

3. The multi-channel cooling system for a die-casting mold based on self-feedback temperature control according to claim 2, wherein: A one-way valve (23) is installed on the outer side wall of the branch pipe (22), the one-way valve (23) is located at one end of the branch pipe (22) close to the heat exchange tube (12), and the third solenoid valve (21) is located at one end of the branch pipe (22) close to the shunt pipe (20).

4. A multi-channel cooling system for a die-casting mold based on self-feedback temperature control according to claim 1, characterized in that: The cooling component (101) further includes a variable frequency water pump (11), a pressure transmitter (24), a connecting pipe (25), a filter assembly (26) and a liquid inlet pipe (27); The pressure transmitter (24) is installed on the outer side wall of the heat exchange tube (12), one end of the connecting pipe (25) is communicated with one end of the filter assembly (26), the liquid inlet pipe (27) is communicated with the other end of the filter assembly (26), and the other end of the connecting pipe (25) is communicated with the water inlet of the variable frequency water pump (11).

5. The multi-channel cooling system for a die-casting mold based on self-feedback temperature control according to claim 4, wherein: The water outlet of the variable frequency water pump (11) is communicated with the top end of the heat exchange tube (12), and the variable frequency water pump (11) is installed on the outer side wall of the lower die base (31).

6. The multi-channel cooling system for a die-casting mold based on self-feedback temperature control according to claim 1, characterized in that: A controller (28) is installed on the outer side wall of the lower die base (31).

7. A multi-channel cooling system for a die-casting mold based on self-feedback temperature control according to claim 4, characterized in that: The filter assembly (26) includes a gland (42), a spring (43), a filter cartridge (44), a gasket (45) and a housing (46); The gland (42) is threadedly connected to the outer side wall of the housing (46), and the filter cartridge (44), the gasket (45) and the spring (43) are all located inside the housing (46).

8. A multi-channel cooling system for a die-casting mold based on self-feedback temperature control according to claim 7, characterized in that: The outer sidewall of the filter cartridge (44) is fitted into the inner sidewall of the housing (46), and both sides of the gasket (45) are respectively in contact with the filter cartridge (44) and the housing (46).

9. A multi-channel cooling system for a die-casting mold based on self-feedback temperature control according to claim 8, characterized in that: One end of the spring (43) abuts against the side of the filter cartridge (44) away from the gasket (45), and the other end of the spring (43) abuts against the gland (42).

10. A multi-channel cooling system for a die-casting mold based on self-feedback temperature control according to claim 9, characterized in that: A fixed disk (47) is installed on one side of the housing (46), the fixed disk (47) is communicated with the end of the connecting pipe (25) away from the variable frequency water pump (11), a connecting disk (41) is fixedly connected to the outer sidewall of the gland (42), and a liquid inlet pipe (27) is installed on one side of the connecting disk (41).

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