Door body foaming constant temperature water circulation system and control method

Abstract

The application provides a door body foaming constant-temperature water circulation system and a control method. The system comprises: an upper mold and a lower mold which are mutually buckled to accommodate a foaming body, a first circulating water path is arranged in the upper mold, and a second circulating water path is arranged in the lower mold; the system further comprises a first temperature sensor, a second temperature sensor and a controller; the first circulating water path comprises at least one first water inlet and one first water outlet; the second circulating water path comprises at least one second water inlet and one second water outlet; at least one first temperature sensor is arranged in the first circulating water path, and at least one second temperature sensor is arranged in the second circulating water path; and the first temperature sensor and the second temperature sensor are in communication connection with the controller. The temperature of the first circulating water path and the second circulating water path is controlled, so that the temperature of the upper mold and the lower mold is kept in a preset interval, thereby solving the problem that the consistency of the door body foaming quality changes greatly.

Description

Technical Field

[0001] This application relates to the field of refrigeration equipment manufacturing, and in particular to a door body foaming constant temperature water circulation system and control method. Background Technology

[0002] The foaming of the refrigerator door and the cabinet body are crucial factors in determining the performance of the refrigerator. The quality of the foaming process, such as the foaming speed and bubble size, will affect the performance of the refrigerator and the production efficiency of the production line.

[0003] In the door manufacturing process, the door body is pressurized using an upper mold and a lower mold. The upper mold produces the inner liner, while the lower mold produces the outer shell. Insulation material, such as foam, is evenly injected into the space between the inner liner and the outer shell for foaming, thus retaining and insulating against external heat. The foaming process requires specific ambient temperature control. If the foaming stage is not properly controlled, the refrigerator's insulation performance will significantly decrease, severely impacting its heat preservation effect. Therefore, a water circulation heating system is typically used during door body foaming to maintain the temperature of the upper and lower molds within a certain range.

[0004] However, the water inlet of the water circulation heating system is located in the lower mold, and the water outlet is located in the upper mold. This results in inconsistent temperatures between the upper and lower molds, leading to significant variations in the consistency of the foaming quality of the door body. Summary of the Invention

[0005] This application provides a constant temperature water circulation system and control method for door body foaming to solve the problem of large variations in the consistency of door body foaming quality.

[0006] In a first aspect, this application provides a door body foaming constant temperature water circulation system, comprising: an upper mold and a lower mold that are interlocked to accommodate a foam body, wherein the upper mold is provided with a first circulation water channel and the lower mold is provided with a second circulation water channel;

[0007] It also includes a first temperature sensor, a second temperature sensor, and a controller. The first circulating water path includes at least one first inlet and one first outlet, and the second circulating water path includes at least one second inlet and one second outlet. At least one first temperature sensor is disposed in the first circulating water path, and at least one second temperature sensor is disposed in the second circulating water path. The first temperature sensor and the second temperature sensor are communicatively connected to the controller.

[0008] The controller is configured to:

[0009] Obtain the upper mold temperature information detected by the first temperature sensor and the lower mold temperature information detected by the second temperature sensor;

[0010] If the temperature of the upper mold is not within the preset range, an internal circulation command is sent to the circulation pump of the first circulating water circuit to control the circulation pump to perform internal circulation;

[0011] If the temperature of the lower mold is not within the preset range, an internal circulation command is sent to the circulation pump of the second circulating water circuit to control the circulation pump to perform internal circulation.

[0012] In some feasible embodiments, both the first and second circulating water paths include a cooling component and a heating component;

[0013] The controller is configured to:

[0014] If the temperature of the upper mold is greater than or equal to the preset range, a start command is sent to the cooling component to control the cooling component to reduce the water temperature of the first circulating water circuit;

[0015] If the temperature of the upper mold is less than the preset range, a start command is sent to the heating component to control the heating component to raise the water temperature of the first circulating water circuit;

[0016] If the temperature of the lower mold is greater than or equal to the preset range, a start command is sent to the cooling component to control the cooling component to reduce the water temperature of the second circulating water circuit;

[0017] If the temperature of the lower mold is less than the preset range, a start command is sent to the heating component to control the heating component to raise the water temperature of the second circulating water circuit.

[0018] In some feasible embodiments, the first and second circulating water channels are curved structures, and the first and second circulating water channels include at least two bends.

[0019] In some feasible embodiments, the system includes a third circulating water path and a fourth circulating water path, the third circulating water path being disposed within the upper mold and the fourth circulating water path being disposed within the lower mold, the third circulating water path including a third inlet and a third outlet, and the fourth circulating water path including a fourth inlet and a fourth outlet.

[0020] In some feasible embodiments, the first water inlet and the first water outlet are respectively located at both ends of the lower mold, the first water inlet and the third water outlet are located at the same end of the lower mold, and the first water outlet and the third water inlet are located at the same end of the lower mold; the second water inlet and the second water outlet are respectively located at both ends of the upper mold, the second water inlet and the fourth water outlet are located at the same end of the lower mold, and the second water outlet and the fourth water inlet are located at the same end of the upper mold.

[0021] In some feasible embodiments, the system further includes a third temperature sensor for detecting the mold cavity temperature, the third temperature sensor being communicatively connected to the controller, the controller being configured to:

[0022] Obtain the mold cavity temperature information detected by the third temperature sensor;

[0023] Obtain the temperature change trend of the mold cavity;

[0024] Based on the changing trend, an internal circulation command is sent to the circulation pumps of the first and / or second circulation water paths to control the circulation pumps to perform internal circulation.

[0025] In some feasible embodiments, the system further includes a fifth circulating water path disposed around the mold cavity, and the controller is further configured to:

[0026] Acquire monitoring nodes, wherein the monitoring nodes are those where the change trend is greater than or equal to a preset temperature threshold;

[0027] Based on the monitoring node, obtain the temperature difference between the monitoring node and the temperature of the upper or lower mold;

[0028] Based on the difference, water is injected into the fifth circulating water path.

[0029] Secondly, this application provides a control method for a door body foaming constant temperature water circulation system, including:

[0030] Obtain the upper mold temperature information detected by the first temperature sensor and the lower mold temperature information detected by the second temperature sensor;

[0031] If the temperature of the upper mold is not within the preset range, an internal circulation command is sent to the circulation pump of the first circulating water circuit to control the circulation pump to perform internal circulation;

[0032] If the temperature of the lower mold is not within the preset range, an internal circulation command is sent to the circulation pump of the second circulating water circuit to control the circulation pump to perform internal circulation.

[0033] In some feasible embodiments, the following are included:

[0034] Obtain the mold cavity temperature information detected by the third temperature sensor;

[0035] Obtain the temperature change trend of the mold cavity;

[0036] Based on the changing trend, an internal circulation command is sent to the circulation pumps of the first and / or second circulation water paths to control the circulation pumps to perform internal circulation.

[0037] As can be seen from the above technical solutions, this application provides a constant temperature water circulation system and control method for door body foaming. The system includes: an upper mold and a lower mold that are interlocked to accommodate the foam body. The upper mold has a first circulating water path, and the lower mold has a second circulating water path. It also includes a first temperature sensor, a second temperature sensor, and a controller. The first circulating water path includes at least one first inlet and one first outlet, and the second circulating water path includes at least one second inlet and one second outlet. At least one first temperature sensor is disposed in the first circulating water path, and at least one second temperature sensor is disposed in the second circulating water path. The first temperature sensor and the second temperature sensor are communicatively connected to the controller. By acquiring the upper mold temperature information detected by the first temperature sensor and the lower mold temperature information detected by the second temperature sensor; if the upper mold temperature is not within a preset range, an internal circulation command is sent to the circulation pump of the first circulating water circuit to control the circulation pump to perform internal circulation; if the lower mold temperature is not within a preset range, an internal circulation command is sent to the circulation pump of the second circulating water circuit to control the circulation pump to perform internal circulation. This can control the temperature of the first and second circulating water circuits to keep the temperatures of the upper and lower molds within the preset range, thereby solving the problem of large variations in the consistency of the foaming quality of the door body. Attached Figure Description

[0038] To more clearly illustrate the technical solution of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0039] Figure 1 This is a schematic diagram of the door body foaming constant temperature water circulation system shown in this embodiment;

[0040] Figure 2 This is a schematic diagram of the control method for the constant temperature water circulation system for door foaming shown in this embodiment.

[0041] Illustration:

[0042] Among them, 100 is the lower mold, 110 is the second circulating water channel, 200 is the upper mold, and 210 is the first circulating water channel. Detailed Implementation

[0043] The embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described below do not represent all embodiments consistent with this application. They are merely examples of systems and methods consistent with some aspects of this application as detailed in the claims.

[0044] During the foaming process of the refrigerator door, a foaming mold is used. To ensure that the temperature of the upper and lower molds in the foaming mold is within a certain range, a water circulation heating system is set up. The water inlet of the water circulation heating system is located in the lower mold, and the water outlet is located in the upper mold. Because the water outlet is located in the upper mold, the water temperature in the upper mold is lower than that in the lower mold, resulting in a large temperature difference between the upper and lower molds. Moreover, when the temperature of the upper mold is higher than the set water temperature, the water circulation heating system stops heating, and when the temperature of the upper mold is lower than the set water temperature, the water circulation heating system starts heating. This causes large temperature fluctuations in the mold during the foaming process, which in turn affects the door's insulation performance significantly.

[0045] Furthermore, regardless of whether the water circulation heating system is in operation or not, the foaming agent will undergo an exothermic reaction during the door body foaming process, generating a large amount of heat. This prevents the foaming from being kept within a relatively constant and safe temperature range, causing the foaming agent to foam faster and affecting the foaming bubbles and foaming density.

[0046] See Figure 1 This application provides a door body foaming constant temperature water circulation system, including: an upper mold 200 and a lower mold 100 that are interlocked to accommodate a foam body. The upper mold 200 has a first circulating water channel 210, and the lower mold 100 has a second circulating water channel 110. When the upper mold 200 and the lower mold 100 are interlocked, a mold cavity is formed. The mold cavity is used for foaming and contains the foam body. The first circulating water channel 210 and the second circulating water channel 110 are constant temperature water circulation systems with the same structure. Both the first circulating water channel 210 and the second circulating water channel 110 include a cooling component, a heating component, a circulation pump, and a water channel. The water channel is used to load water, the cooling component is used to cool the water in the water channel to lower the water temperature, the heating component is used to heat the water in the water channel to raise the water temperature, and the circulation pump is used to control the water circulation in the water channel.

[0047] The first circulating water path 210 includes at least one first inlet and one first outlet, and the second circulating water path 110 includes at least one second inlet and one second outlet. Since the first circulating water path 210 and the second circulating water path 110 are constant-temperature water circulation systems with the same structure, in this embodiment, the first inlet and the second inlet are described together and referred to as inlets. Figure 1 At point A, the first and second water outlets will be described together, both referred to as water outlets. (See section A for details.) Figure 1 At point B, the inlet and outlet are located on the water path. Understandably, when the water volume in the water path is within the preset range, there is no need to add water to the inlet or drain water from the outlet. When the water volume in the water path is less than the preset range, water is added through the inlet, and the outlet is closed. When the water volume in the water path is greater than the preset range, water is drained through the outlet, and the inlet is closed.

[0048] When water needs to be injected into the inlet, if the water temperature is higher than the preset temperature, the cooling component will be activated; if the water temperature is lower than the preset temperature, the heating component will be activated.

[0049] In some embodiments, the first circulating water path 210 and the second circulating water path 110 are curved structures, and the first circulating water path 210 and the second circulating water path 110 include at least two bending points. The curved structure may be W-shaped.

[0050] The system also includes a first temperature sensor, a second temperature sensor, and a controller. At least one first temperature sensor is disposed in the first circulating water path 210, and at least one second temperature sensor is disposed in the second circulating water path 110. The first and second temperature sensors are communicatively connected to the controller. The first temperature sensor is used to detect the temperature of the first circulating water path 210 in the upper mold 200, and the second temperature sensor is used to detect the temperature of the second circulating water path 110 in the lower mold 100.

[0051] The controller is configured as follows:

[0052] Acquire the temperature information of the upper mold 200 detected by the first temperature sensor, and the temperature information of the lower mold 100 detected by the second temperature sensor;

[0053] If the temperature of the upper mold 200 is not within the preset range, an internal circulation command is sent to the circulation pump of the first circulation water channel 210 to control the circulation pump to perform internal circulation.

[0054] If the temperature of the lower mold 100 is not within the preset range, an internal circulation command is sent to the circulation pump of the second circulation water channel 110 to control the circulation pump to perform internal circulation.

[0055] For example, the temperature of the first circulating water path 210 and the temperature of the second circulating water path 110 are detected. If the preset range is 45-55℃, and the temperature of the first circulating water path 210 is 43℃ ​​or 58℃, the circulating pump is controlled to start so that the water path can perform internal circulation. The internal circulation includes cooling internal circulation and heating internal circulation.

[0056] In addition to controlling the start of the circulation pump, in some embodiments, the controller is configured to: send a start command to the cooling component if the temperature of the upper mold 200 is greater than or equal to a preset range, so as to control the cooling component to lower the water temperature of the first circulation water path 210; and send a start command to the heating component if the temperature of the upper mold 200 is less than the preset range, so as to control the heating component to raise the water temperature of the first circulation water path 210.

[0057] If the temperature of the lower mold 100 is greater than or equal to the preset range, a start command is sent to the cooling component to control the cooling component to lower the water temperature of the second circulating water circuit 110; if the temperature of the lower mold 100 is less than the preset range, a start command is sent to the heating component to control the heating component to raise the water temperature of the second circulating water circuit 110.

[0058] For example, when the water temperature is 58°C, the cooling component starts and the circulation pump starts, which lowers the water temperature and equalizes the water temperature throughout the water circuit; when the water temperature is 43°C, the heating component starts and the circulation pump starts, which raises the water temperature and equalizes the water temperature throughout the water circuit.

[0059] In the upper mold 200 or the lower mold 100, the water temperature can be controlled not only through a single circulating water path, but also, in some embodiments, a third and a fourth circulating water path. The third circulating water path is located within the upper mold 200, and the fourth circulating water path is located within the lower mold 100. The third circulating water path includes a third inlet and a third outlet, and the fourth circulating water path includes a fourth inlet and a fourth outlet. Water temperature is controlled by providing two circulating water paths in each of the upper mold 200 and the lower mold 100.

[0060] Because the circulating water path has a curved structure, the temperatures at the two ends of the circulating water path, namely the inlet and outlet, may be different when the circulating pump is not started. Therefore, in some embodiments, the first inlet and the first outlet are respectively located at the two ends of the lower mold 100, the first inlet and the third outlet are located at the same end of the lower mold 100, and the first outlet and the third inlet are located at the same end of the lower mold 100; the second inlet and the second outlet are respectively located at the two ends of the upper mold 200, the second inlet and the fourth outlet are located at the same end of the lower mold 100, and the second outlet and the fourth inlet are located at the same end of the upper mold 200.

[0061] For example, when there are two circulating water channels within the upper mold 200, namely the first circulating water channel 210 and the third circulating water channel, the inlet of the first circulating water channel 210 and the outlet of the third circulating water channel are located at one end, and the outlet of the first circulating water channel 210 and the inlet of the third circulating water channel are located at the other end. By setting the outlet of one circulating water channel and the inlet of the other circulating water channel at the same end, it is easier to equalize the temperature of the upper mold 200.

[0062] Because the foaming agent undergoes an exothermic reaction during the foaming process of the door body, generating a large amount of heat, in order to make the temperature more stable, in some embodiments, the system also includes a third temperature sensor. The third temperature sensor is used to detect the temperature of the mold cavity and is communicatively connected to the controller.

[0063] The controller is configured to: acquire mold cavity temperature information detected by a third temperature sensor; acquire the trend of mold cavity temperature change; and, based on the trend of change, send an internal circulation command to the circulation pump of the first circulation water path 210 and / or the second circulation water path 110 to control the circulation pump to perform internal circulation.

[0064] The trend involves the foaming machine generating a large amount of heat, causing the temperature inside the mold cavity to rise rapidly within a short period. If this trend is detected, an internal circulation command is sent to the first circulating water path 210 and the second circulating water path 110. Simultaneously, the cooling components are activated to perform internal cooling circulation. Furthermore, to quickly handle the large amount of heat generated, the cooling range of the cooling components can be controlled.

[0065] When the first circulating water path 210 and the second circulating water path 110 are used to handle the large amount of heat generated, rapid cooling will result in the water temperature of the first circulating water path 210 and the second circulating water path 110 being low after the exothermic reaction. Heating components are still needed to reheat them, which cannot be precisely controlled and makes the temperature unstable. In some embodiments, the system also includes a fifth circulating water path, which is located on the periphery of the mold cavity. The fifth circulating water path is different from the first circulating water path 210, the second circulating water path 110, the third circulating water path, and the fourth circulating water path in that the fifth circulating water path can be a constant temperature water circulation system or a heated water circulation system.

[0066] The controller is also configured as follows:

[0067] Acquire monitoring nodes; the monitoring nodes are those whose changing trend is greater than or equal to a preset temperature threshold.

[0068] Based on the monitoring nodes, obtain the temperature difference between the monitoring node and the upper or lower mold temperature;

[0069] Based on the difference, water is injected into the fifth circulating water channel.

[0070] For example, regardless of whether the fifth circulating water circuit is a constant temperature water circulation system or a heated water circulation system, no water is injected into the fifth circulating water circuit when foaming is not performed. When a monitoring node is detected, water with a temperature lower than the preset temperature is injected into the fifth circulating water circuit, and the specific temperature of the injected water is set according to the difference.

[0071] Based on the aforementioned door foaming constant temperature water system, some embodiments of this application also provide a control method for the door foaming constant temperature water circulation system, see [link to relevant documentation]. Figure 2 ,include:

[0072] S100: Obtain the upper mold temperature information detected by the first temperature sensor and the lower mold temperature information detected by the second temperature sensor.

[0073] The first temperature sensor is used to detect the temperature of the first circulating water channel in the upper mold, and the second temperature sensor is used to detect the temperature of the second circulating water channel in the lower mold.

[0074] S110: If the temperature of the upper mold is not within the preset range, send an internal circulation command to the circulation pump of the first circulation water circuit to control the circulation pump to perform internal circulation.

[0075] The internal circulation includes heating internal circulation and cooling internal circulation. The system can determine whether to perform heating internal circulation or cooling internal circulation by comparing the temperature of the first circulation water circuit with the preset range.

[0076] S120: If the temperature of the lower mold is not within the preset range, send an internal circulation command to the circulation pump of the second circulation water circuit to control the circulation pump to perform internal circulation.

[0077] To detect the exothermic reaction of the foaming agent during the foaming process and to keep the foaming within a relatively constant and safe temperature range, some embodiments include: acquiring mold cavity temperature information detected by a third temperature sensor; acquiring the trend of mold cavity temperature change; and, based on the trend, sending an internal circulation command to the circulation pumps of the first and / or second circulation water paths to control the circulation pumps to perform internal circulation.

[0078] By acquiring the mold cavity temperature information detected by the third temperature sensor, temperature changes within the mold cavity can be monitored in real time. Based on the acquired temperature trend, an internal circulation command can be sent to the circulation pumps in the first and / or second circulation water paths. This internal circulation command controls the circulation pumps to perform internal circulation, thereby adjusting the flow rate and temperature of the circulating water, and ultimately affecting the temperature of the mold cavity.

[0079] As can be seen from the above technical solutions, this application provides a constant temperature water circulation system and control method for foaming a door body. The system includes: an upper mold and a lower mold that are interlocked to accommodate the foamed body. The upper mold has a first circulating water path, and the lower mold has a second circulating water path. The system also includes a first temperature sensor, a second temperature sensor, and a controller. The first circulating water path includes at least one first inlet and one first outlet, and the second circulating water path includes at least one second inlet and one second outlet. At least one first temperature sensor is disposed in the first circulating water path, and at least one second temperature sensor is disposed in the second circulating water path. The first temperature sensor and the second temperature sensor are communicatively connected to the controller. By acquiring the upper mold temperature information detected by the first temperature sensor and the lower mold temperature information detected by the second temperature sensor; if the upper mold temperature is not within the preset range, an internal circulation command is sent to the circulation pump of the first circulating water circuit to control the circulation pump to perform internal circulation; if the lower mold temperature is not within the preset range, an internal circulation command is sent to the circulation pump of the second circulating water circuit to control the circulation pump to perform internal circulation. This can control the temperature of the first and second circulating water circuits to keep the temperatures of the upper and lower molds within the preset range, thereby solving the problem of large variations in the consistency of the foaming quality of the door body.

[0080] Similar parts between the embodiments provided in this application can be referred to mutually. The specific implementation methods provided above are only a few examples under the overall concept of this application and do not constitute a limitation on the scope of protection of this application. For those skilled in the art, any other implementation methods extended from the solution of this application without creative effort shall fall within the scope of protection of this application.

Claims

1. A door body foaming constant temperature water circulation system, characterized in that, include: An upper mold and a lower mold are interlocked to accommodate the foam, wherein the upper mold is provided with a first circulating water channel and the lower mold is provided with a second circulating water channel; It also includes a first temperature sensor, a second temperature sensor, and a controller. The first circulating water path includes at least one first inlet and one first outlet, and the second circulating water path includes at least one second inlet and one second outlet. At least one first temperature sensor is disposed in the first circulating water path, and at least one second temperature sensor is disposed in the second circulating water path. The first temperature sensor and the second temperature sensor are communicatively connected to the controller. The controller is configured to: Obtain the upper mold temperature information detected by the first temperature sensor and the lower mold temperature information detected by the second temperature sensor; If the temperature of the upper mold is not within the preset range, an internal circulation command is sent to the circulation pump of the first circulating water circuit to control the circulation pump to perform internal circulation; If the temperature of the lower mold is not within the preset range, an internal circulation command is sent to the circulation pump of the second circulation water circuit to control the circulation pump to perform internal circulation; It also includes a third temperature sensor for detecting the mold cavity temperature, the third temperature sensor being communicatively connected to the controller, the controller being configured to: Obtain the mold cavity temperature information detected by the third temperature sensor; Obtain the temperature change trend of the mold cavity; Based on the changing trend, an internal circulation command is sent to the circulation pumps of the first and / or second circulation water paths to control the circulation pumps to perform internal circulation; It also includes a fifth circulating water channel, which is disposed on the periphery of the mold cavity, and the controller is further configured to: Acquire monitoring nodes, wherein the monitoring nodes are those where the change trend is greater than or equal to a preset temperature threshold; Based on the monitoring node, obtain the temperature difference between the monitoring node and the temperature of the upper or lower mold; Based on the difference, water is injected into the fifth circulating water path.

2. The door body foaming constant temperature water circulation system according to claim 1, characterized in that, Both the first and second circulating water circuits include a cooling component and a heating component; The controller is configured to: If the temperature of the upper mold is greater than or equal to the preset range, a start command is sent to the cooling component to control the cooling component to reduce the water temperature of the first circulating water circuit; If the temperature of the upper mold is less than the preset range, a start command is sent to the heating component to control the heating component to raise the water temperature of the first circulating water circuit; If the temperature of the lower mold is greater than or equal to the preset range, a start command is sent to the cooling component to control the cooling component to reduce the water temperature of the second circulating water circuit; If the temperature of the lower mold is less than the preset range, a start command is sent to the heating component to control the heating component to raise the water temperature of the second circulating water circuit.

3. The door body foaming constant temperature water circulation system according to claim 1, characterized in that, The first and second circulating water channels are curved structures, and each of them includes at least two bends.

4. The door body foaming constant temperature water circulation system according to claim 1, characterized in that, The system includes a third circulating water path and a fourth circulating water path. The third circulating water path is located inside the upper mold, and the fourth circulating water path is located inside the lower mold. The third circulating water path includes a third inlet and a third outlet, and the fourth circulating water path includes a fourth inlet and a fourth outlet.

5. The door body foaming constant temperature water circulation system according to claim 4, characterized in that, The first water inlet and the first water outlet are respectively located at both ends of the lower mold, the first water inlet and the third water outlet are located at the same end of the lower mold, and the first water outlet and the third water inlet are located at the same end of the lower mold; the second water inlet and the second water outlet are respectively located at both ends of the upper mold, the second water inlet and the fourth water outlet are located at the same end of the lower mold, and the second water outlet and the fourth water inlet are located at the same end of the upper mold.

6. A control method for a door body foaming constant temperature water circulation system, characterized in that, The method, applied to the door body foaming constant temperature water circulation system according to any one of claims 1-5, comprises: Obtain the upper mold temperature information detected by the first temperature sensor and the lower mold temperature information detected by the second temperature sensor; If the temperature of the upper mold is not within the preset range, an internal circulation command is sent to the circulation pump of the first circulating water circuit to control the circulation pump to perform internal circulation; If the temperature of the lower mold is not within the preset range, an internal circulation command is sent to the circulation pump of the second circulation water circuit to control the circulation pump to perform internal circulation; Obtain the mold cavity temperature information detected by the third temperature sensor; Obtain the temperature change trend of the mold cavity; Based on the changing trend, an internal circulation command is sent to the circulation pumps of the first and / or second circulation water paths to control the circulation pumps to perform internal circulation; Acquire monitoring nodes, wherein the monitoring nodes are those where the change trend is greater than or equal to a preset temperature threshold; Based on the monitoring node, obtain the temperature difference between the monitoring node and the temperature of the upper or lower mold; Based on the difference, water is injected into the fifth circulating water path.

Images