Mold temperature control system for industrial manufacturing

Abstract

The utility model discloses a mold temperature control system for industrial manufacturing. The mold temperature control system comprises a mold set, a waste heat boiler, a liquid nitrogen gasifier, an air source heat pump unit and a middle water tank. A circulation channel is arranged in each mold in the mold set, and the internal guiding efficiency is improved through the circulation channels. The two ends of a circulation channel on the mold set are connected with an inlet pipe and an outlet pipe respectively, and the inlet pipe is connected with a waste heat boiler and a liquid nitrogen gasifier. The delivery pipe is connected with a nitrogen treatment tank or a tail gas discharge end; the delivery pipe is further connected with a middle water tank, and the middle water tank is connected with the inlet pipe through a circulating pump to achieve circulation of high-temperature liquid. According to the mold temperature control system, the mold can be rapidly, accurately and stably cooled in various forms, the production efficiency can be effectively improved through cooling, the influence of high temperature on injection molding products is reduced to the minimum, and the mold temperature control system is ideal for industrial manufacturing.

Description

Technical Field

[0001] This utility model relates to the field of molding die control, and in particular to a control system for mold temperature in industrial manufacturing. Background Technology

[0002] As is well known, injection molding is a process in which plastics or other composite materials are rapidly molded in a mold under high temperature and pressure. This method is widely used in industrial applications such as children's toys, plastic nozzles, tableware, and furniture. The process generally consists of four stages: casting, heating, cooling, and molding. The duration of each stage depends on the size of the molded part and the specific material type. It is a continuous operation characterized by rapid heating and cooling.

[0003] The problem with this injection molding process in the existing technology is that, due to the influence of the natural environment, the cooling time of the mold is longer during summer operations, which reduces the production efficiency of the production line. In particular, during extreme weather in summer, the injection material stays in the mold for too long, which can also cause product defects.

[0004] In view of the above-disclosed drawbacks, the technical problem to be solved by this utility model is how to solve the process problems in the cooling stage, adopt a reasonable cooling method, and cooperate with control strategies to enable the process line to operate quickly and normally, thereby improving product quality and increasing work efficiency. Utility Model Content

[0005] To overcome the shortcomings of existing technologies, this utility model provides a control system for mold temperature in industrial manufacturing. This utility model solves the process problems in the cooling stage by adopting evaporative cooling and cooling method, combined with control strategies, to cool down step by step, so as to ensure the normal operation of the process line, improve product quality, and increase work efficiency.

[0006] The technical solution adopted by this utility model to solve its technical problem is:

[0007] A control system for mold temperature in industrial manufacturing includes a mold assembly, a waste heat boiler, a liquid nitrogen vaporizer, an air source heat pump unit, and an intermediate water tank.

[0008] The mold assembly includes one or more independent molds; each independent mold has a circulation channel inside, which improves the internal guiding efficiency.

[0009] The circulation channel on the mold assembly is connected to an inlet pipe and an outlet pipe at both ends. The inlet pipe is connected to a waste heat boiler and a liquid nitrogen vaporizer. The outlet pipe is connected to a nitrogen storage tank or a tail gas discharge end. The outlet pipe is also connected to an intermediate water tank, which is connected to the inlet pipe through a circulation pump to achieve the circulation of high-temperature liquid.

[0010] The waste heat boiler, liquid nitrogen vaporizer, and intermediate water tank are all equipped with valves, which are used to control the opening and closing of the waste heat boiler, liquid nitrogen vaporizer, and intermediate water tank.

[0011] The independent mold is equipped with a temperature measuring device, which is connected to a controller; the controller monitors the temperature measuring device and independently controls the corresponding valves on the waste heat boiler, liquid nitrogen vaporizer, and intermediate water tank.

[0012] The intermediate water tank is connected to an air source heat pump unit, which is then connected to the inlet pipe via a pipeline for auxiliary heat supplementation.

[0013] The waste heat boiler pressure is controlled at 1.0 MPa, and the temperature of the mold assembly is controlled by stabilizing the pressure.

[0014] The liquid nitrogen vaporizer is connected to an external nitrogen tank. It uses liquid nitrogen for vaporization, and the temperature after vaporization is generally controlled at 21°C. Then, it is connected to the mold assembly through an inlet pipe.

[0015] The air source heat pump unit is an ultra-low temperature model, which can meet the requirements of normal operation at -25 degrees Celsius in winter, and prepare cold water at about 7 degrees Celsius to be introduced into the mold for cooling.

[0016] The intermediate water tank is covered with 50mm thick rubber and plastic insulation for heat insulation. It handles all water volumes, including circulating water, expansion water, and steam liquefaction water, of the water system.

[0017] The beneficial effects of this utility model are as follows: This utility model provides a mold temperature control system for industrial manufacturing, comprising a mold assembly, a waste heat boiler, a liquid nitrogen vaporizer, an air source heat pump unit, and an intermediate water tank. Each mold within the mold assembly has an internal circulation channel, which improves internal guiding efficiency. The circulation channel on the mold assembly is connected to an inlet pipe and an outlet pipe at both ends. The inlet pipe is connected to the waste heat boiler and the liquid nitrogen vaporizer; the outlet pipe is connected to a nitrogen treatment tank or a tail gas discharge end; the outlet pipe is also connected to the intermediate water tank, which is connected to the inlet pipe via a circulation pump to achieve high-temperature liquid circulation. This utility model can achieve rapid, precise, and stable cooling of the mold through various means. This cooling effectively improves production efficiency and minimizes the impact of high temperatures on injection molded products, making it an ideal mold temperature control system for industrial manufacturing. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the connection structure of this utility model;

[0019] In the attached diagram: 1. Mold assembly; 11. Temperature measuring device; 12. Circulation channel; 13. Inlet control valve; 14. Outlet control valve; 15. Independent mold; 2. Inlet pipe; 3. Outlet pipe; 31. Solenoid valve I; 32. Solenoid valve II; 33. Gas-liquid separator; 34. Drain outlet; 4. Nitrogen storage tank; 5. Waste heat boiler; 51. Steam inlet pump; 52. Steam control valve; 6. Liquid nitrogen vaporizer; 61. Liquid nitrogen inlet pump; 62. Liquid nitrogen control valve; 7. Intermediate water tank; 71. Water tank control valve I; 72. Circulating water pump; 73. Water tank control valve II; 8. Air source heat pump unit; 81. Heat pump control valve; 9. Workshop office; 10. Controller. Detailed Implementation

[0020] The present invention will be described in detail below through specific embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. However, it should be noted that the specific embodiments described below do not limit the technical solution. Those skilled in the art can make further technical extensions under the guidance of the following technical solutions. The scope of protection of this patent application is determined by the claims.

[0021] Example 1: Figure 1 As shown, a control system for mold temperature in industrial manufacturing has the following connection structure: it includes a mold assembly 1, a waste heat boiler 5, a liquid nitrogen vaporizer 6, an air source heat pump unit 8, and an intermediate water tank 7. The mold assembly 1 includes several independent molds 15 arranged in parallel. Each independent mold 15 has a circulation channel 12 inside, which improves the internal guiding efficiency. On the mold assembly 1, an inlet pipe 2 and an outlet pipe 3 are connected to both ends of the circulation channel 12 on each of the independent molds 15. The waste heat boiler 5 and the liquid nitrogen vaporizer 6 are connected to the inlet pipe 2. The outlet pipe 3 is connected to a nitrogen storage tank 4 or a tail gas discharge end. In this embodiment, a gas-liquid separator 33 is connected to the outlet pipe 3, and the nitrogen storage tank 4 is connected to the rear side of the gas-liquid separator 33. The pressure of the waste heat boiler 5 is controlled at 1.0 MPa, and the mold assembly is temperature controlled by stabilizing the pressure.

[0022] Furthermore, an intermediate water tank 7 is connected to the outlet pipe 3. The intermediate water tank 7 is connected to the inlet pipe 2 via a circulation pump 72 to achieve the circulation supply of high-temperature liquid. The surface of the intermediate water tank 7 is covered with a 50mm thick rubber and plastic insulation layer for heat insulation. It handles all water volumes of the water system, including circulating water, expansion water, and steam liquefaction.

[0023] The waste heat boiler 5, liquid nitrogen vaporizer 6, and intermediate water tank 7 are each equipped with corresponding valves, namely steam control valve 52, liquid nitrogen control valve 62, water tank control valve I 71, and water tank control valve II 73. With the above structural arrangement, when this utility model is in operation, the switching control of waste heat boiler 5, liquid nitrogen vaporizer 6, and intermediate water tank 7 can be realized through each valve.

[0024] This utility model provides a temperature measuring device 11 on each independent mold 15, and the temperature measuring device 11 is connected to the controller 10; the controller 10 monitors the temperature measuring device 11 and independently controls the corresponding valves on the waste heat boiler 5, the liquid nitrogen vaporizer 6, and the intermediate water tank 7.

[0025] An air source heat pump unit 8 is connected to the intermediate water tank 7. The air source heat pump unit 8 is connected to the inlet pipe again through a pipeline for heat supplementation. A heat pump control valve 81 is also provided on the rear side of the air source heat pump unit 8.

[0026] The liquid nitrogen vaporizer 6 is connected to an external nitrogen tank. It uses liquid nitrogen for vaporization, and the temperature after vaporization is generally controlled at 21°C. Then, it is connected to the mold assembly 1 through an inlet pipe.

[0027] The air source heat pump unit 8 is an ultra-low temperature model, which can meet the requirements of normal operation at -25 degrees Celsius in winter and prepare cold water at about 7 degrees Celsius to be introduced into the mold for cooling.

[0028] Example 2: The control process of the above control system achieves automatic switching between valves through a set time signal. Simultaneously, it controls the working state of the mold by setting manual and automatic modes. The total cycle time of the entire process is approximately 7 minutes. Its specific operation flow is as follows:

[0029] 1. Heating: After casting, the independent mold 15 enters the heating stage. Steam is introduced into the independent mold 15 through the steam inlet pump 51 and steam control valve 52 on the waste heat boiler 5, heating it from room temperature to about 200°C for 2 minutes. At this time, the solenoid valve I31 is opened, and the steam is condensed to form condensate, which is then collected in the intermediate water tank 7. The heating process is completed.

[0030] 2. First purge: After heating for 2 minutes, nitrogen is used for purging. At this time, the liquid nitrogen inlet pump 61, liquid nitrogen control valve 62, and solenoid valve II 32 are turned on. The purging time is about 30 seconds. At this time, the nitrogen temperature is about 21°C, which has a certain pre-cooling effect. The purged nitrogen flows into the nitrogen storage tank 4 after passing through the gas-liquid separator 33. The liquid separated from the nitrogen flows to the outside through the drain port 34; thus completing one purging process.

[0031] 3. Cooling: After the purging process is completed, the independent mold 15 is cooled down from about 200°C to about 40°C using cold water at about 7°C provided by the air source heat pump unit 8. The cooling time is about 2 minutes. The cooling process is completed by the heat pump control valve 81, the circulating water pump 72, the water tank control valve II 73, and the solenoid valve I 31.

[0032] 4. Secondary purging: After cooling is complete, the above valves and water pumps are closed, and nitrogen is used for secondary purging. At this time, liquid nitrogen inlet pump 61, liquid nitrogen control valve 62, and solenoid valve II 32 are opened. The purging time is about 30 seconds. The nitrogen temperature is about 21℃, which has a certain cooling effect; the secondary purging process is completed.

[0033] 5: Finished product handling: After the secondary purging process is completed, turn off the working button of the independent mold 15, take out the finished product from the independent mold 15, clean the independent mold 15, put the raw material into the independent mold 15, turn on the working button of the independent mold 15, and enter the heating process; the working time for the finished product handling and material injection process is about 1 minute each. At this time, all valves and equipment are closed.

[0034] Furthermore, in extreme winter weather: when the room temperature is below -10°C, the cooling process can be carried out without turning on the air source heat pump unit 8 (whether to turn it on or not is based on feedback from the mold temperature measuring device 11, and the controller 10 will automatically perform this operation), and the water will directly enter the mold for cooling through the intermediate water tank 7, water tank control valve I 71, circulating water pump 72, and water tank control valve II 73.

[0035] Furthermore, when the workshop's production tasks are insufficient and the air source heat pump unit 8 does not need to operate at full load, the air source heat pump unit 8 can provide cooling and heating services for the workshop office.

[0036] In summary, this utility model can achieve rapid, precise, and stable cooling of molds through various means. This cooling method can effectively improve production efficiency and minimize the impact of high temperatures on injection molded products. It is an ideal mold temperature control system for industrial manufacturing.

Claims

1. A control system for mold temperature in industrial manufacturing, characterized in that: It includes a mold assembly, a waste heat boiler, a liquid nitrogen vaporizer, an air source heat pump unit, and an intermediate water tank; The mold assembly includes one or more independent molds; each independent mold has a circulation channel inside, which improves the internal guiding efficiency. The circulation channel on the mold assembly is connected to an inlet pipe and an outlet pipe at both ends. The inlet pipe is connected to a waste heat boiler and a liquid nitrogen vaporizer. The outlet pipe is connected to a nitrogen storage tank or a tail gas discharge end. The outlet pipe is also connected to an intermediate water tank, which is connected to the inlet pipe through a circulation pump to achieve the circulation of high-temperature liquid.

2. The control system for mold temperature in industrial manufacturing as described in claim 1, characterized in that: Valves are installed on the waste heat boiler, liquid nitrogen vaporizer, and intermediate water tank.

3. A control system for mold temperature in industrial manufacturing as described in claim 2, characterized in that: The independent mold is equipped with a temperature measuring device, which is connected to a controller; the controller monitors the temperature measuring device and independently controls the corresponding valves on the waste heat boiler, liquid nitrogen vaporizer, and intermediate water tank.

4. A control system for mold temperature in industrial manufacturing as described in claim 1, characterized in that: The intermediate water tank is connected to an air source heat pump unit, which is then connected to the inlet pipe via a pipeline.

5. A control system for mold temperature in industrial manufacturing as described in claim 1, characterized in that: The pressure of the waste heat boiler is controlled at 1.0 MPa.

6. A control system for mold temperature in industrial manufacturing as described in claim 1, characterized in that: The liquid nitrogen vaporizer is connected to an external nitrogen tank.

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