Mold temperature controller system with stepped temperature control function

Abstract

The utility model discloses a stepped temperature control mold temperature controller system, and relates to the technical field of mold temperature controllers. The constant temperature control unit group and the switching valve system are electrically connected with the central control unit, the constant temperature control unit group comprises a plurality of constant temperature units, and each constant temperature unit is used for heating or cooling heat transfer fluid to a preset constant temperature. The constant temperature of each constant temperature unit forms a temperature sequence with gradient difference, and the constant temperature units are used for conveying heat transfer fluid with corresponding temperature to the test equipment; the switching valve system comprises a plurality of switching valves and is used for controlling the flow direction and on-off of the heat transfer fluid output by the corresponding constant temperature units; and the central control unit is used for controlling the on-off state of the corresponding switching valve to realize stepped temperature control of the heat transfer fluid input by the test equipment in a temperature sequence range. According to the technical scheme, compared with an existing mold temperature controller system, the mold temperature controller has the advantages of being rapid and accurate in temperature switching, free of long-time waiting, high in use stability, low in cost and high in reliability.

Description

Technical Field

[0001] This utility model relates to the field of mold temperature controller technology, specifically to a mold temperature controller system with stepped temperature control. Background Technology

[0002] As modern industrial manufacturing evolves towards higher precision and complexity, core processes such as plastic injection molding, aluminum alloy die casting, and semiconductor packaging place stringent demands on the temperature control of molds and workpieces. In actual production processes, different stages often require varying temperature parameters: for example, in plastic injection molding, a higher mold temperature is needed during the melt filling stage to reduce flow resistance, the holding pressure stage requires gradual cooling to accelerate solidification, and the cooling stage requires precisely maintaining a low temperature range to ensure dimensional stability. However, traditional mold temperature controllers generally employ a single temperature setting mode, maintaining only a fixed temperature range and failing to adapt to the dynamic needs of stepwise temperature changes during the process. While they can output different temperatures to achieve temperature switching, the heating or cooling waiting time is long, energy costs are high, and they cannot meet the requirements for rapid and accurate temperature switching, resulting in poor temperature control accuracy and stability, thus failing to meet the demands of high-precision industrial production. Utility Model Content

[0003] The purpose of this invention is to address the shortcomings and deficiencies of the existing technology by providing a stepped temperature control mold temperature controller system, which solves at least one of the aforementioned technical problems. It has the advantages of rapid and accurate temperature switching, no need for long waiting times, high stability, low cost, and high reliability.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is: a mold temperature control system with stepped temperature control, comprising:

[0005] Central control unit;

[0006] A temperature control unit group electrically connected to the central control unit, the temperature control unit group comprising multiple temperature control units, each temperature control unit being used to heat or cool a heat transfer fluid to a preset constant temperature, and the constant temperatures of the various temperature control units forming a temperature sequence with gradient differences, the temperature control units being used to deliver heat transfer fluid at corresponding temperatures to the testing equipment; and

[0007] A switching valve system electrically connected to the central control unit, the switching valve system including multiple switching valves, at least one of the switching valves is provided at the heat transfer fluid output end of each constant temperature unit, for controlling the flow direction and on / off of the heat transfer fluid output by the corresponding constant temperature unit;

[0008] The central control unit is used to control the on / off state of the corresponding switching valve, so as to realize the step temperature control of the heat transfer fluid input to the test equipment within the temperature sequence range.

[0009] This utility model further includes:

[0010] A temperature detection component, electrically connected to the central control unit, is used to detect the actual temperature of the thermostat unit; and

[0011] A heat exchanger, electrically connected to the central control unit, is located at the heat transfer fluid output end of the constant temperature unit and is used to cool the actual temperature of the heat transfer fluid output by the constant temperature unit to a preset constant temperature.

[0012] The present invention further includes: a cooling unit electrically connected to the central control unit, and a heating unit electrically connected to the central control unit; both the cooling unit and the heating unit are connected to the heat exchanger via pipes.

[0013] The cooling unit is provided with a cooling branch, which includes an inlet pipe connected to the liquid inlet end of the heat exchanger and an outlet pipe connected to the liquid outlet end of the heat exchanger.

[0014] In a further embodiment of this invention, the cooling unit includes:

[0015] An evaporator is used to evaporate and cool a heat transfer fluid to a preset temperature.

[0016] A cold circulation pump, connected to one end of the evaporator via a pipe, is used to deliver heat transfer fluid cooled to a preset temperature to the test equipment through the switching valve;

[0017] The compressor is connected to the lower side of the evaporator via a pipe, and a refrigerant low pressure gauge and a refrigerant low pressure switch are installed between the evaporator and the compressor;

[0018] The condenser is connected to the right side of the compressor via a pipe, and a refrigerant high-pressure switch and a refrigerant high-pressure gauge are installed between the condenser and the compressor; and

[0019] A dryer is connected between the evaporator and the condenser via a pipe.

[0020] The present invention further comprises, wherein the heating unit includes:

[0021] Heaters, comprising multiple units, are provided for heating the heat transfer fluid to a preset temperature; and

[0022] The main circulation pump is connected between the heater and the heat exchanger via a pipeline. The main circulation pump pumps the heat transfer fluid heated to a preset temperature into the heat exchanger and delivers it to the test equipment through the switching valve.

[0023] The present invention further provides that the switching valve is a three-way valve for controlling the on / off of the heat transfer fluid output from the evaporator, and a two-way valve for controlling the on / off of the heat transfer fluid output from the heater.

[0024] The present invention further includes: an automatic fluid replenishment unit electrically connected to the central control unit, the automatic fluid replenishment unit comprising:

[0025] A replenishment tank, connected between the heating unit and the cooling unit via a pipe, is used to store heat transfer fluid, and a liquid level sensor is installed on the replenishment tank;

[0026] A replenishment pump is connected to the replenishment tank via a pipeline, and the outlet of the replenishment pump is connected to the replenishment tank; and

[0027] A replenishing solenoid valve is connected between the replenishing pump and the cold circulation pump via a pipeline, and the replenishing solenoid valve is connected to the inlet end of the replenishing pump;

[0028] The cooling unit is connected to an external liquid storage device via a replenishment ball valve.

[0029] The present invention further includes: a constant pressure unit electrically connected to the central control unit, the constant pressure unit including an air tank, a first pressure sensor and a pressure regulating valve, the first pressure sensor being connected to the replenishment tank, and the air tank being connected to the replenishment tank through a pipeline to maintain the pressure stability inside the replenishment tank;

[0030] The pressure regulating valve includes: an intake solenoid valve connected to the replenishment tank, and an exhaust solenoid valve connected between the replenishment tank and the cooling unit.

[0031] After adopting the above technical solution, the beneficial effects of this utility model are as follows: In this utility model, multiple independent constant temperature units are coordinated by the central control unit. Multiple constant temperature units can start heating or cooling the heat transfer fluid at the same time to form a gradient temperature sequence to reach preset temperatures such as 10℃, 50℃, 90℃, and 120℃ respectively. The flow direction and on / off of the heat transfer fluid are precisely switched by the switching valve system to realize the step-type temperature control of the testing equipment. It is suitable for processes that require multi-stage temperature changes. Therefore, compared with the existing mold temperature controller system, it has the advantages of fast and accurate temperature switching, no need for long waiting time, high stability, low cost, and high reliability. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1 This is a schematic diagram of a mold temperature controller system with stepped temperature control.

[0034] Explanation of reference numerals in the attached drawings: 110, First thermostatic unit; 120, Second thermostatic unit; 130, Third thermostatic unit; 140, Fourth thermostatic unit; 210, First switching valve group; 220, Second switching valve group; 230, Third switching valve group; 240, Fourth switching valve group; 300, Cooling unit; 310, Cooling branch; 311, Liquid inlet pipe; 312, Liquid outlet pipe; 320, Evaporator; 330, Cold circulation pump; 340, Compressor; 350, Condenser; 3 60. Dryer; 370. Liquid replenishment ball valve; 400. Heating unit; 410. Heater; 420. Main circulation pump; 500. Testing equipment; 600. Heat exchanger; 700. Automatic liquid replenishment unit; 710. Liquid replenishment tank; 711. Liquid level sensor; 720. Liquid replenishment pump; 730. Liquid replenishment solenoid valve; 740. Vertical check valve; 800. Constant pressure unit; 810. Gas storage tank; 820. First pressure sensor; 831. Inlet solenoid valve; 832. Exhaust solenoid valve. Detailed Implementation

[0035] The present invention will be further described in detail below with reference to the accompanying drawings.

[0036] This specific embodiment is merely an explanation of the present utility model and is not intended to limit the present utility model. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive element, but as long as they are within the scope of the claims of the present utility model, they are protected by patent law.

[0037] This embodiment relates to a mold temperature controller system with stepped temperature control, referring to... Figure 1 It includes a central control unit, a constant temperature control unit group, and a switching valve system.

[0038] The central control unit is a central controller, which can use a PLC or industrial computer as the control core. It is also equipped with a touch-screen human-machine interface (HMI), allowing users to set parameters such as target temperature, water output time, and sequence for the thermostatic control unit group. Through preset programs, it controls the coordinated operation of the thermostatic unit group and the switching valve system to achieve automated, stepped temperature control and improve production efficiency. In some embodiments, the central control unit can also employ other control methods. The thermostatic control unit group is electrically connected to the central control unit and includes four independent thermostatic units. It should be noted that the thermostatic control unit can also have three, five, or more thermostatic units; no specific limitation is required here. The four thermostatic units simultaneously begin heating or cooling the heat transfer fluid to a preset constant temperature, forming a temperature sequence with gradient differences, such as reaching preset temperatures of 10°C, 50°C, 90°C, and 120°C respectively. It should be noted that the preset heating or cooling temperatures of the thermostatic units can be adjusted according to the temperature requirements of different processes or application scenarios; no specific limitation is required here. The thermostatic units are used to deliver heat transfer fluids corresponding to different preset temperatures to different process stages in the testing equipment 500. By allowing each thermostat unit to preheat or cool simultaneously, waiting time is reduced, energy consumption and costs are lowered, and the heat transfer fluid required for different processes can be supplied quickly and promptly, improving production efficiency. It should be noted that the heat transfer fluid can be liquids such as water or heat transfer oil. The switching valve system is electrically connected to the central control unit and includes eight switching valves. It should be noted that the switching valve system can also be equipped with four, six, or more switching valves; no specific limitation is required here. Each thermostat unit has one switching valve corresponding to its heat transfer fluid output end and one switching valve corresponding to its heat transfer fluid return end. Therefore, each thermostat unit is controlled by two switching valves equipped with inlet and outlet ends. These two switching valves form a switching valve group to control the flow direction and on / off state of the heat transfer fluid output from the corresponding thermostat unit, achieving fast valve response, high control accuracy, and precise temperature switching.

[0039] The central control unit controls the on / off state of the corresponding switching valves to achieve stepped temperature control of the heat transfer fluid input to the test equipment 500 within a temperature sequence range. Specifically, in this embodiment, the preset temperature of the heat transfer fluid in the first constant temperature unit 110 is 10°C, controlled by the first switching valve group 210; the preset temperature of the heat transfer fluid in the second constant temperature unit 120 is 50°C, controlled by the second switching valve group 220; the preset temperature of the heat transfer fluid in the third constant temperature unit 130 is 90°C, controlled by the third switching valve group 230; and the preset temperature of the heat transfer fluid in the fourth constant temperature unit 140 is 120°C, controlled by the fourth switching valve group 240. When the system is started, the central control unit controls each constant temperature unit to simultaneously start heating or cooling to its respective preset temperature, forming a gradient temperature sequence. The switching valve groups corresponding to each constant temperature unit are triggered sequentially according to a preset timetable, causing the heat transfer fluid to flow to the test equipment 500 according to a stepped temperature curve. Twenty seconds after startup, the first switching valve group 210 corresponding to the first thermostatic unit 110 is triggered, and the first thermostatic unit 110 outputs heat transfer fluid at 10°C to the test equipment 500; forty seconds after startup, the second switching valve group 220 corresponding to the second thermostatic unit 120 is triggered, and the second thermostatic unit 120 outputs heat transfer fluid at 50°C to the test equipment 500; fifty seconds after startup, the third switching valve group 230 corresponding to the third thermostatic unit 130 is triggered, and the third thermostatic unit 130 outputs heat transfer fluid at 90°C to the test equipment 500. In the initial stage, 90 seconds after startup, the fourth switching valve group 240 corresponding to the fourth thermostatic unit 140 is triggered, and the fourth thermostatic unit 140 outputs heat transfer fluid at 120℃ to the test equipment 500. 120 seconds after startup, the switching valve group corresponding to the second thermostatic unit 120 is triggered again, and the second thermostatic unit 120 outputs heat transfer fluid at 50℃ to the test equipment 500. 140 seconds after startup, the switching valve group corresponding to the first thermostatic unit 110 is triggered again, and the first thermostatic unit 110 outputs heat transfer fluid at 10℃ to the test equipment 500. Therefore, through the above control process, a stepwise temperature change is achieved, meeting the temperature requirements of different process stages.

[0040] The first constant temperature unit 110 is a cooling constant temperature unit, and the second constant temperature unit 120, the third constant temperature unit 130, and the fourth constant temperature unit 140 constitute a heating constant temperature unit. Specifically, in this embodiment, a temperature detection component and a heat exchanger 600 are also included. The temperature detection component is electrically connected to the central control unit and consists of multiple temperature sensors used to detect the actual temperature of the heat transfer fluid in each constant temperature unit in real time and transmit this data to the central control unit. This enables real-time monitoring of whether the heat transfer fluid has reached a preset temperature or an abnormal temperature, ensuring temperature gradient accuracy and guaranteeing the stability and safety of stepped temperature control. The heat exchanger 600 is electrically connected to the central control unit and is located at the heat transfer fluid output end of the constant temperature unit. By utilizing the low-temperature coolant from the cooling constant temperature unit to exchange heat with the heat transfer fluid output from the heating constant temperature unit, the overshooting actual temperature is reduced to a preset constant temperature value. For example, if the heating heat transfer fluid overshoots from 120°C to an actual temperature of 125°C, it is rapidly cooled back to the preset temperature of 120°C.

[0041] In this embodiment, a cooling unit 300 and a heating unit 400 are also included. Both the cooling unit 300 and the heating unit 400 are electrically connected to the central control unit and are connected to the heat exchanger 600 via pipes. The cooling unit 300 is equipped with a cooling temperature control unit, capable of cooling the heat transfer fluid to a preset temperature and supplying a low-temperature medium to the heat exchanger 600. This reduces the temperature overshoot of the heating temperature control unit to a preset constant temperature value, quickly offsetting the temperature overshoot. Furthermore, the cooling unit 300 is provided with a cooling branch 310 through which the low-temperature medium flows into the heat exchanger 600. The cooling unit 300 also has a main cooling path to transport the cooled heat transfer fluid to the testing equipment 500. The cooling branch 310 includes an inlet pipe 311 and an outlet pipe 312. The inlet pipe 311 receives the cold source, and its outlet end is connected to the inlet end of the heat exchanger 600, which in turn is connected to the main cooling circuit to extract a portion of the coolant from the heat transfer fluid and deliver it to the heat exchanger 600. The outlet pipe 312 discharges the heat-absorbing medium, and its inlet end is connected to the outlet end of the heat exchanger 600, while its outlet end flows back into the cooling unit 300. Specifically, in this embodiment, the inlet pipe 311 is equipped with a cooling ball valve, a first Y-type filter, and a thermostatic solenoid valve from left to right.

[0042] In this embodiment, the cooling unit 300 includes an evaporator 320, a cold circulation pump 330, a compressor 340, a condenser 350, and a dryer 360. The evaporator 320 is used to evaporate and cool the heat transfer fluid to a preset temperature. The refrigerant absorbs heat from the heat transfer fluid during evaporation within the evaporator 320, achieving cooling to a preset low temperature of 10°C, providing a cold source for the test equipment 500 and the heat exchanger 600. The cold circulation pump 330 is connected to one end of the evaporator 320 via a pipe, driving the low-temperature heat transfer fluid to circulate within the pipe. The heat transfer fluid cooled to the preset temperature by the evaporator 320 is stably delivered to the test equipment 500 under the control of the first switching valve group 210. The compressor 340 is connected to the lower side of the evaporator 320 via a pipe, compressing the low-pressure gaseous refrigerant discharged from the evaporator 320 into a high-pressure gaseous state, increasing its temperature and pressure. A refrigerant low-pressure gauge and a refrigerant low-pressure switch are installed between the evaporator 320 and the compressor 340, from left to right. The condenser 350 is connected to the right side of the compressor 340 via a pipe. Through air cooling, the high-pressure gaseous refrigerant discharged from the compressor 340 releases heat and condenses into a high-pressure liquid, releasing the heat absorbed by the refrigerant and completing the heat release stage of the refrigeration cycle, ensuring the refrigerant can be reused. A refrigerant high-pressure switch and a refrigerant high-pressure gauge are installed between the condenser 350 and the compressor 340, from left to right. The dryer 360 is connected between the evaporator 320 and the condenser 350 via a pipe, adsorbing moisture and impurities in the refrigerant to prevent moisture from freezing inside the evaporator 320 and clogging the pipes, or to prevent impurities from damaging the compressor 340.

[0043] The heating unit 400 is equipped with a heating and temperature control unit to provide heat transfer fluids at different high temperatures to the testing equipment 500. Specifically, in this embodiment, the heating unit 400 includes heaters 410 and a main circulation pump 420. Three heaters 410 are provided, respectively located in the second temperature control unit 120, the third temperature control unit 130, and the fourth temperature control unit 140. Each heater 410 converts electrical energy into heat energy, which is directly contacted with the heat transfer fluid or heated through the metal wall, raising the heat transfer fluid to different preset temperatures, such as 50°C, 90°C, and 120°C, forming a three-level temperature gradient to meet the requirements of different processes for medium- and high-temperature ranges, such as 50°C preheating, 90°C reaction, and 120°C curing. Independent operation avoids mutual interference. It should be noted that four, five, or more heaters 410 may also be provided; no specific limitation is required here. The main circulation pump 420 is connected between the heater 410 and the heat exchanger 600 via a pipeline. Driven by a motor, the impeller rotates, generating a pressure difference that propels the heat transfer fluid heated by the heater 410 to circulate within the pipeline. The main circulation pump 420 pumps the heat transfer fluid heated to a preset temperature into the heat exchanger 600 and delivers it to the test equipment 500 through a switching valve, ensuring a stable delivery of the high-temperature fluid to the test equipment 500.

[0044] In this embodiment, the switching valves are a three-way valve for controlling the on / off of the heat transfer fluid output from the corresponding evaporator 320 and a two-way valve for controlling the on / off of the heat transfer fluid output from the corresponding heater 410. The first switching valve group 210 is a three-way valve, which achieves multi-path control through valve core switching. It controls the on / off of low-temperature fluid and can also guide the fluid back to the evaporator 320 for circulation when not outputting. At the same time, it allows high-temperature fluid to flow into the test equipment 500 from the three-way valve after passing through the heat exchanger 600. The second switching valve group 220, the third switching valve group 230, and the fourth switching valve group 240 are all two-way valves. The opening and closing of the valve core achieves single-path on / off control. They have a simple structure, fast response, and can accurately cut off the output of high-temperature fluid.

[0045] Reference Figure 1 Specifically, in this embodiment, the testing device 500 is connected to an input pipe and an output pipe at both ends. From left to right, a second pressure sensor, a first temperature sensor, and a first ball valve are sequentially arranged on the input pipe. From left to right, a second temperature sensor, a second Y-type filter, and a second ball valve are sequentially arranged on the output pipe.

[0046] In this embodiment, an automatic replenishment unit 700 electrically connected to the central control unit is also included for storing and replenishing the heat transfer fluid. The automatic replenishment unit 700 includes a replenishment tank 710, a replenishment pump 720, and a replenishment solenoid valve 730. The replenishment tank 710 is connected between the heating unit 400 and the cooling unit 300 via a pipe, serving as a storage container for the heat transfer fluid. The output end of the replenishment tank 710 is sequentially connected to three heaters 410 to provide a continuous supply of heat transfer fluid to the heating elements. A liquid level sensor 711 is installed on the replenishment tank 710 to monitor the internal liquid level in real time and transmit the signal to the central control unit, triggering a replenishment action to prevent the system from shutting down due to insufficient liquid. The replenishment pump 720 is connected to the replenishment tank 710 via a pipe, and its outlet end is connected to the replenishment tank 710, pressurizing and delivering the heat transfer fluid from the circuit containing the cold circulation pump 330 to the replenishment tank 710. A replenishment solenoid valve 730 is connected between the replenishment pump 720 and the cold circulation pump 330 via a pipeline. The replenishment solenoid valve 730 is connected to the inlet end of the replenishment pump 720. The central control unit controls the opening and closing of the valve core to switch the path between the replenishment pump 720 and the cold circulation pump 330. The cooling unit 300 is connected to an external liquid storage device via a replenishment ball valve 370, which serves as a backup channel for manual replenishment, facilitating the replenishment of new heat transfer fluid to the system. Specifically, in this embodiment, a vertical check valve 740 is provided between the replenishment pump 720 and the replenishment tank to prevent backflow of the heat transfer fluid.

[0047] In this embodiment, a constant pressure unit 800 electrically connected to the central control unit is also included to maintain the system pressure within a set range. The constant pressure unit 800 includes an air storage tank 810, a first pressure sensor 820, and a pressure regulating valve. The air storage tank 810 pre-stores compressed gas and connects to the replenishment tank 710 via a pipeline, providing a stable gas source for pressure regulation. This ensures stable pressure when replenishing the replenishment tank 710 and maintains the system pressure within the set range, achieving a constant pressure effect. The first pressure sensor 820 is connected to the replenishment tank 710, which is connected via a pipeline. It monitors the pressure value inside the replenishment tank 710 in real time. When the pressure deviates from the set range, it triggers an intake or exhaust action to maintain pressure stability in the replenishment tank 710 and the system. The pressure regulating valve includes an intake solenoid valve 831 and an exhaust solenoid valve 832. The intake solenoid valve 831 is connected to the replenishment tank 710, allowing compressed gas from the air storage tank 810 to enter the replenishment tank 710 for rapid gas replenishment. The exhaust solenoid valve 832 is connected between the replenishment tank 710 and the cooling unit 300, venting excess gas from the replenishment tank into the cooling unit 300 and then discharging it from the cooling unit 300, thus achieving timely exhaust and pressure reduction. Specifically, in this embodiment, a water-gas separator, a pressure reducing valve, and an air filter are arranged sequentially from left to right between the gas storage tank 810 and the intake solenoid valve 831.

[0048] The working principle of this utility model is roughly as follows: Upon power-on, the central control unit initializes all system components. Air is expelled from the system via the constant pressure unit 800 to maintain the system pressure within the set range. The central control unit controls four thermostatic units to simultaneously begin heating or cooling, reaching preset temperatures of 10℃, 50℃, 90℃, and 120℃ respectively. The central control unit then controls the switching valve system to sequentially open the outlet valves of each thermostatic unit, achieving a stepped temperature change.

[0049] The above is only used to illustrate the technical solution of this utility model and not to limit it. Any other modifications or equivalent substitutions made by those skilled in the art to the technical solution of this utility model, as long as they do not depart from the spirit and scope of the technical solution of this utility model, should be covered within the scope of the claims of this utility model.

Claims

1. A mold temperature control system with stepped temperature control, characterized in that, include: Central control unit; A constant temperature control unit group electrically connected to the central control unit includes multiple constant temperature units. Each constant temperature unit is used to heat or cool the heat transfer fluid to a preset constant temperature, and the constant temperatures of each constant temperature unit form a temperature sequence with gradient differences. The constant temperature unit is used to deliver heat transfer fluid of the corresponding temperature to the test equipment (500). as well as A switching valve system electrically connected to the central control unit, the switching valve system including multiple switching valves, at least one of the switching valves is provided at the heat transfer fluid output end of each constant temperature unit, for controlling the flow direction and on / off of the heat transfer fluid output by the corresponding constant temperature unit; The central control unit is used to control the on / off state of the corresponding switching valve, so as to realize the step temperature control of the heat transfer fluid input to the test equipment (500) within the temperature sequence range.

2. The mold temperature control system with stepped temperature control according to claim 1, characterized in that, Also includes: A temperature detection component, electrically connected to the central control unit, is used to detect the actual temperature of the constant temperature unit; as well as A heat exchanger (600) is electrically connected to the central control unit. The heat exchanger (600) is located at the heat transfer fluid output end of the constant temperature unit and is used to cool the actual temperature of the heat transfer fluid output by the constant temperature unit to a preset constant temperature.

3. The mold temperature control system with stepped temperature control according to claim 2, characterized in that, Also includes: A cooling unit (300) electrically connected to the central control unit, and a heating unit (400) electrically connected to the central control unit; both the cooling unit (300) and the heating unit (400) are connected to the heat exchanger (600) via pipes; The cooling unit (300) is provided with a cooling branch (310), which includes: an inlet pipe (311) connected to the liquid inlet end of the heat exchanger (600), and an outlet pipe (312) connected to the liquid outlet end of the heat exchanger (600).

4. The mold temperature control system with stepped temperature control according to claim 3, characterized in that, The cooling unit (300) includes: Evaporator (320) is used to evaporate and cool the heat transfer fluid to a preset temperature; A cold circulation pump (330) is connected to one end of the evaporator (320) via a pipe and is used to deliver heat transfer fluid cooled to a preset temperature to the test equipment (500) through the switching valve; The compressor (340) is connected to the lower side of the evaporator (320) via a pipe. A refrigerant low pressure gauge and a refrigerant low pressure switch are provided between the evaporator (320) and the compressor (340). A condenser (350) is connected to the right side of the compressor (340) via a pipe. A refrigerant high-pressure switch and a refrigerant high-pressure gauge are provided between the condenser (350) and the compressor (340). A dryer (360) is connected between the evaporator (320) and the condenser (350) via a pipe.

5. The mold temperature control system with stepped temperature control according to claim 4, characterized in that, The heating unit (400) includes: Heater (410), provided with multiple heaters for heating the heat transfer fluid to a preset temperature; and The main circulation pump (420) is connected between the heater (410) and the heat exchanger (600) through a pipeline. The main circulation pump (420) pumps the heat transfer fluid heated to the preset temperature into the heat exchanger (600) and delivers it to the test equipment (500) through the switching valve.

6. The mold temperature control system with stepped temperature control according to claim 5, characterized in that, The switching valve is a three-way valve for controlling the on / off of the heat transfer fluid output from the evaporator (320) and a two-way valve for controlling the on / off of the heat transfer fluid output from the heater (410).

7. The mold temperature control system with stepped temperature control according to claim 5, characterized in that, Also includes: An automatic fluid replenishment unit (700) electrically connected to the central control unit, the automatic fluid replenishment unit (700) comprising: A replenishment tank (710) is connected between the heating unit (400) and the cooling unit (300) via a pipe and is used to store heat transfer fluid. A liquid level sensor (711) is provided on the replenishment tank (710). A replenishment pump (720) is connected to the replenishment tank (710) via a pipe, and the outlet end of the replenishment pump (720) is connected to the replenishment tank (710); and A replenishing solenoid valve (730) is connected between the replenishing pump (720) and the cold circulation pump (330) via a pipeline, and the replenishing solenoid valve (730) is connected to the inlet end of the replenishing pump (720); The cooling unit (300) is connected to an external liquid storage device via a replenishment ball valve (370).

8. The mold temperature control system with stepped temperature control according to claim 7, characterized in that, Also includes: A constant pressure unit (800) electrically connected to the central control unit includes a gas storage tank (810), a first pressure sensor (820), and a pressure regulating valve. The first pressure sensor (820) is connected to the replenishment tank (710), and the gas storage tank (810) is connected to the replenishment tank (710) through a pipeline to maintain the pressure stability in the replenishment tank (710). The pressure regulating valve includes: an intake solenoid valve (831) connected to the replenishment tank (710), and an exhaust solenoid valve (832) connected between the replenishment tank (710) and the cooling unit (300).

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