Novel mold device for producing fuel tank

Abstract

The embodiment of the utility model discloses a novel mold device for producing a fuel tank. According to one specific implementation mode, the novel mold device comprises a mold, a mold cavity for injection molding and a pipeline used for liquid circulation flowing are formed in the mold, the pipeline is arranged around the mold cavity, and an inlet and an outlet are formed in the outer surface of the mold and connected with the two ends of the pipeline respectively; the cooling box, the first liquid inlet and the first liquid return opening are respectively connected with an inlet and an outlet of the mold through pipelines; a heater and a temperature detector are arranged in the heating box, and a second liquid inlet and a second liquid return port of the heating box are connected with an inlet and an outlet of the mold through pipelines respectively; and a control valve is arranged on a pipeline for connecting the mold with the cooling box and the heating box. According to the mold device, the heating box is connected, so that the temperature difference between the mold cavity and the environment (especially in summer) can be reduced, generation of condensate water is avoided, and the reject ratio of uneven surfaces of products caused by the condensate water is reduced.

Description

Technical Field

[0001] The embodiments of the present disclosure relate to the technical field of fuel tank production, and more particularly to a novel mold device for producing fuel tanks. Background Art

[0002] The plastic molding industry typically requires the use of a variety of molds for manufacturing. To improve production efficiency, molds are often cooled by water channels within them. However, due to humidity issues, large amounts of condensation often form on the mold cavity surface in the summer, resulting in uneven and uneven product surfaces and condensation marks. This problem is particularly prominent in the manufacturing of automotive fuel tanks.

[0003] The above information disclosed in this Background section is only for enhancement of understanding of the background of the present disclosure concept and therefore it may contain information that does not form the prior art that is already known in this country to a person of ordinary skill in the art. Utility Model Content

[0004] The content of this disclosure is intended to briefly introduce concepts that will be described in detail in the detailed description section below. This content is not intended to identify key or essential features of the claimed technical solutions, nor is it intended to limit the scope of the claimed technical solutions. Some embodiments of this disclosure propose a novel mold assembly for producing fuel tanks that effectively reduces the generation of condensation within the mold cavity during summer, thereby reducing the problem of uneven surfaces in the produced fuel tanks and improving the production quality and yield rate of fuel tanks.

[0005] Some embodiments of the present disclosure provide a new mold device for producing fuel tanks, including: a mold, having an injection molding cavity formed therein, and a pipeline for liquid circulation, the pipeline being arranged around the cavity, and an inlet and an outlet being provided on the outer surface of the mold, respectively connected to the two ends of the pipeline; a cooling box, used to transport cooling liquid into the pipeline of the mold, a first liquid inlet and a first liquid return port of the cooling box being respectively connected to the inlet and outlet of the mold through pipelines; a heating box, used to transport warm liquid into the pipeline of the mold, having a heater and a temperature detector provided therein, a second liquid inlet and a second liquid return port of the heating box being respectively connected to the inlet and outlet of the mold through pipelines; wherein a control valve is also provided on the pipeline connecting the mold to the cooling box and the heating box, for controlling the on and off of the mold and the cooling box and the heating box.

[0006] In some embodiments, the first liquid inlet is connected to the inlet pipeline at a first interface, and the second liquid inlet is connected to the inlet pipeline at a second interface; the first liquid return port is connected to the outlet pipeline at a third interface, and the second liquid return port is connected to the outlet pipeline at a fourth interface.

[0007] In some embodiments, a first control valve is provided between the first liquid inlet and the first interface, a second control valve is provided between the second liquid inlet and the second interface, a third control valve is provided between the first liquid return port and the third interface, and a fourth control valve is provided between the second liquid return port and the fourth interface.

[0008] In some embodiments, a fifth control valve is set at the first target interface, and a sixth control valve is set at the second target interface, wherein the fifth control valve and the sixth control valve are three-way control valves, the first target interface is the interface between the first interface and the second interface, close to the inlet of the mold, and the second target interface is the interface between the third interface and the fourth interface, close to the outlet of the mold.

[0009] In some embodiments, the interior of the heating box is divided into a liquid inlet area and a liquid return area, the second liquid inlet and the heater are arranged in the liquid inlet area, the second liquid return port is arranged in the liquid return area, and the liquid return area is also provided with a liquid replenishment interface; a filter element is provided between the liquid inlet area and the liquid return area, which is used to filter the liquid flowing from the liquid return area into the liquid inlet area.

[0010] In some embodiments, a first circulation pump is provided at the first liquid inlet, and a second circulation pump is provided at the second liquid inlet; the second circulation pump is also connected to the return liquid area of ​​the heating box through a circulation pipeline, wherein the interface connected to the circulation pipeline is located between the second circulation pump and the second control valve; the circulation pipeline includes a first sub-pipeline and a second sub-pipeline in parallel, a pressure relief valve is provided on the first sub-pipeline, and a circulation control valve is provided on the second sub-pipeline, wherein when the second control valve and the fourth control valve are opened, the circulation control valve is closed.

[0011] In some embodiments, drain valves are respectively provided at the bottom of the liquid inlet area and the liquid return area of ​​the heating box; and a manual valve is provided between the second liquid inlet and the second control valve, and the manual valve is located between the interface connecting the circulation pipeline and the second control valve, and a manual valve is provided at the inlet of the circulation pipeline; a manual valve is provided between the second liquid return port and the fourth control valve.

[0012] The above-mentioned various embodiments of the present disclosure have the following beneficial effects: the new mold device for producing fuel tanks disclosed in the present disclosure, by adding a heating box, can realize the temperature control of the cavity in the mold by alternating cooling liquid and warm liquid through the pipes in the mold. When the mold is in the production process, the mold can be connected to the cooling box so that the cooling liquid can be used to cool the product. Before the production of the mold product is completed, the mold can be switched in advance to connect to the heating box so that the mold surface can be brought to an appropriate temperature using warm liquid. In this way, when the mold cavity is exposed to the air, the generation of condensation water on the cavity surface can be reduced or avoided. Furthermore, when the next product is produced, the occurrence of the product appearance being not smooth and even due to condensation water and the presence of condensation water marks can be reduced, thereby effectively reducing the defective rate of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The above and other features, advantages, and aspects of the various embodiments of the present disclosure will become more apparent with reference to the following detailed description in conjunction with the accompanying drawings. Throughout the drawings, the same or similar reference numerals represent the same or similar elements. It should be understood that the drawings are schematic and that components and elements are not necessarily drawn to scale.

[0014] Figure 1 It is a schematic structural diagram of some embodiments of the novel mold device disclosed in the present invention;

[0015] Figure 2 Schematic diagram of the structure of some embodiments of the heating box in the novel mold device disclosed in the present invention. DETAILED DESCRIPTION

[0016] Embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although certain embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be construed as being limited to the embodiments described herein. On the contrary, these embodiments are provided to provide a more thorough and complete understanding of the present disclosure. It should be understood that the drawings and embodiments of the present disclosure are for illustrative purposes only and are not intended to limit the scope of protection of the present disclosure.

[0017] It should also be noted that, for ease of description, only the parts related to the relevant utility model are shown in the drawings. In the absence of conflict, the embodiments and features in the embodiments of the present disclosure can be combined with each other.

[0018] It should be noted that the concepts of "first" and "second" mentioned in this disclosure are only used to distinguish different devices, modules or units, and are not used to limit the order or interdependence of the functions performed by these devices, modules or units.

[0019] It should be noted that the modifications of "one" and "multiple" mentioned in the present disclosure are illustrative rather than restrictive, and those skilled in the art should understand that unless otherwise clearly indicated in the context, they should be understood as "one or more".

[0020] The present disclosure will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0021] Figure 1 Schematic diagrams of the structures of some embodiments of the novel mold device for producing fuel tanks disclosed in the present invention are shown. Figure 1 As shown, the novel mold assembly may include a mold, a cooling box, and a heating box. The mold may have a cavity and a pipe (not shown). The cavity's shape and structure are adapted to the fuel tank's exterior structure for injection molding the fuel tank or other components. A pipe ring may be provided around the cavity to circulate liquid. The mold's outer surface may be provided with an inlet and an outlet, each connected to the ends of the pipe.

[0022] Here, the cooling box is generally used to transport cooling liquid into the pipeline of the mold. The cooling box can be provided with a first liquid inlet A and a first liquid return port B. The first liquid inlet A can be connected to the inlet of the mold through a pipeline. And the first liquid return port B can also be connected to the outlet of the mold through a pipeline. The heating box is generally used to transport warm liquid into the pipeline of the mold. The interior of the heating box can be provided with a heater and a temperature detector. The heater can heat the liquid in the heating box. The temperature detector can detect the temperature of the liquid in the heating box. In addition, the heating box can also be provided with a second liquid inlet C and a second liquid return port D. The second liquid inlet C can be connected to the inlet of the mold through a pipeline. The second liquid return port D can also be connected to the outlet of the mold through a pipeline.

[0023] It should be noted that the liquids in the cooling and heating boxes can be adjusted based on actual needs. For example, to reduce production costs, ordinary water can be used. Another example is to improve thermal conductivity and shorten production time, a mixture of water and other liquids can be used. Because liquids will mix during use, the cooling and heating liquids are usually the same liquid.

[0024] It's understood that the mold used for fuel tank injection molding typically consists of two parts. When the two parts are joined, a complete cavity is formed within the mold for fuel tank production. After the fuel tank is completed, the mold can be opened—the two parts can be separated—to remove the produced fuel tank for the next production run. In this case, to ensure uniform cooling, pipes can be installed in both mold parts. Furthermore, the end faces of the two mold parts facing each other can be provided with pipe joints. This allows the pipes in the two mold parts to communicate through the pipe joints after the molds are joined. In this case, an inlet can be provided on the outer surface of one mold part, and an outlet can be provided on the outer surface of the other mold part.

[0025] Optionally, to further improve cooling efficiency, both mold halves can be equipped with inlets and outlets that connect to internal pipes. This allows cooling liquid to be delivered simultaneously to both mold halves. Because the temperature of the liquid entering both mold halves is the same, cooling uniformity can be further improved, thereby enhancing product cooling and production efficiency.

[0026] In addition, control valves can be installed on the pipes connecting the mold to the cooling and heating boxes. These control valves can be used to control the flow of liquid into the mold pipes. Typically, cooling liquid is used to cool the product during production. Warm liquid, on the other hand, is used to heat the mold, reducing the temperature difference between the mold (especially the cavity) and the surrounding environment. This can reduce or prevent condensation on the cavity surface caused by temperature differences after mold opening. Therefore, only one type of liquid is supplied to the mold at any one time.

[0027] From the above description, it can be seen that the new mold device for producing fuel tanks disclosed in the present invention, by adding a heating box, can use a method of alternating cooling liquid and warm liquid through the pipes inside the mold to achieve temperature control of the mold cavity. When the mold is in the production process, the mold can be connected to the cooling box so that the cooling liquid can be used to cool the product. Before the production of the mold product is completed, the mold can be switched in advance to connect to the heating box so that the mold surface can be brought to an appropriate temperature using warm liquid. In this way, when the mold cavity is exposed to the air, the generation of condensed water on the cavity surface can be reduced or avoided. Furthermore, when the next product is produced, the occurrence of uneven product appearance due to condensed water and condensed water marks can be reduced, thereby effectively reducing the defective rate of the product. In addition, before the production of the next product, the mold can be switched again to connect to the cooling box so that the mold enters the optimal cooling state for the molding operation.

[0028] It is understandable that the structure model and installation position of the above control valve can also be set according to actual needs. Figure 1As shown, the first liquid inlet A and the inlet pipeline can be connected at the first interface. The second liquid inlet C and the inlet pipeline can be connected at the second interface. The inlet pipeline is usually a pipeline connected to the inlet of the mold. The above-mentioned first interface and the second interface can be interfaces at the same position or interfaces at different positions. In addition, the first liquid return port B and the outlet pipeline can be connected at the third interface. The second liquid return port D and the outlet pipeline can be connected at the fourth interface. The outlet pipeline is usually a pipeline connected to the outlet of the mold. The above-mentioned third interface and the fourth interface can also be interfaces at the same position or interfaces at different positions.

[0029] In this case, if Figure 1 As shown, a first control valve (i.e., valve 1) can be provided between the first liquid inlet A and the first interface. A second control valve (i.e., valve 2) can be provided between the second liquid inlet C and the second interface. In addition, a third control valve (i.e., valve 3) can be provided between the first liquid return port B and the third interface. And a fourth control valve (i.e., valve 4) can be provided between the second liquid return port D and the fourth interface. The first to fourth control valves here can be one-way control valves. In addition, to achieve automated production, these control valves can be electric valves.

[0030] Optionally, to reduce the number of components in the device, a fifth control valve can be installed at the first target interface, while a sixth control valve can be installed at the second target interface. The fifth and sixth control valves can typically be three-way control valves. That is, one end of the three-way control valve is connected to the mold, and the other ends are connected to the cooling and heating boxes, respectively. The first target interface is typically the interface between the first and second interfaces, closer to the mold inlet. The second target interface is typically the interface between the third and fourth interfaces, closer to the mold outlet.

[0031] In some applications, a circulating pump can be installed in the pipelines connecting the mold to the cooling and heating boxes to achieve liquid circulation. For example, the circulating pump can be installed at the mold inlet, that is, between the interface connecting the first and second liquid inlets and the mold inlet.

[0032] Furthermore, if Figure 2 As shown, the interior of the heating box can be divided into a liquid inlet area J and a liquid return area H. The second liquid inlet C and the heater can be arranged in the liquid inlet area. The second liquid return port D can be arranged in the liquid return area H. And a filter element G is provided between the liquid inlet area J and the liquid return area H. The filter element G can be used to filter the liquid flowing from the liquid return area H into the liquid inlet area J. Thereby, the impurity content in the pipeline can be effectively reduced, and the smooth flow of the liquid can be ensured. It is understandable that with continuous production, the continuous heating of the heater in the heating box will result in a reduction in liquid volatilization, so as Figure 2As shown, the liquid return area H can also be provided with a liquid supplement interface connected with a water supplement pipe, for supplementing liquid into the heating tank.

[0033] It can be understood that before the mold is connected with the heating tank, the liquid in the heating tank needs to be heated to a specified temperature by the heater. Here, in order to ensure the uniformity of the liquid temperature in the heating tank, a circulating pump is usually installed at the end of the heating tank to realize the internal circulation of the liquid in the heating tank during the heating process. In this case, a first circulating pump can be provided at the first liquid inlet A. And a second circulating pump can be provided at the second liquid inlet C. The first circulating pump is used to realize the circulation of the cooling liquid when the mold is connected with the cooling tank. The second circulating pump is used to realize the circulation of the warm liquid when the mold is connected with the heating tank.

[0034] In addition, the second circulating pump is also used for the internal circulation of the liquid in the heating tank. At this time, the second circulating pump can be connected with the liquid return area of the heating tank through a circulating pipeline. Here, the interface connected with the liquid return area can be the same interface as the second liquid return port D, or it can be a different interface. In order to ensure that the liquid in the heating tank can circulate normally in the two states, the interface connected with the circulating pipeline is usually located between the second circulating pump and the second control valve. Figure 2 In this way, whether the heating tank is connected with the mold or not, the circulation of the warm liquid can be realized under the action of the second circulating pump.

[0035] Further, the circulating pipeline can include a first sub-pipeline and a second sub-pipeline connected in parallel. The first sub-pipeline is provided with a pressure relief valve. The pressure relief valve can avoid too high water pressure in the pipeline to ensure production safety. And the second sub-pipeline is provided with a circulation control valve, that is, valve C in Figure 2 When the liquid in the heating tank is internally circulated, the circulation control valve is usually opened. When the second control valve and the fourth control valve are opened, that is, when the heating tank is connected with the mold, the circulation control valve is usually closed.

[0036] In some embodiments, in order to facilitate the maintenance and repair of the new mold device, the liquid inlet area J and the bottom of the liquid return area H of the heating tank can be respectively provided with a liquid discharge valve. The liquid in the heating tank can be discharged through the liquid discharge valve, which is convenient for internal cleaning of the heating tank and replacement of filter elements, etc. In addition, for safety and maintenance considerations, a manual valve can also be provided on the pipeline to realize manual closing. For example, a manual valve can be provided between the second liquid inlet C and the second control valve. And the manual valve is located between the interface connected with the circulating pipeline and the second control valve. And a manual valve can be provided between the second liquid return port D and the fourth control valve. In this way, when the heating tank needs to be maintained and repaired, the two manual valves can be manually closed. In addition, a manual valve can also be provided at the inlet of the circulating pipeline. Thus, the maintenance and repair of the circulating pipeline can be facilitated.

[0037] In addition, a drain valve can be installed at the bottom of the cooling box. Both the cooling box and the heating box can also be equipped with water level detection components. This way, when the liquid in the box reaches a set level, the drain valve can be controlled to open, thereby draining excess liquid from the box. When the liquid in the box falls below the set level, the drain valve can be controlled to close.

[0038] From the above description, it can be seen that the new mold device disclosed in this disclosure is mainly divided into two parts:

[0039] The first step is to lay out the heating box control system. A heater controls the heating of the liquid inside the heating box. Through temperature feedback, heating is turned on if the set temperature is not reached; heating is stopped when the set water temperature is reached. A filter is also added inside the heating box to filter impurities from the liquid. A circulating pump delivers the liquid from the heating box to the mold for heat exchange. When the second and fourth control valves of the heating box are opened and the circulating control valve is closed, the warm liquid is conveyed through the mold by the circulating pump and then returns to the interior of the heating box, forming a heat exchange cycle. When the second and fourth control valves of the heating box are closed and the circulating control valve is opened, the warm liquid is circulated through the circulating pump to the liquid inside the heating box, ensuring uniform temperature inside the heating box. A safety valve (i.e., a pressure relief valve) is also added to prevent excessive water pressure in the pipeline from causing safety accidents. Furthermore, tooling is reserved on the pipeline for convenient repairs, water changes, and other maintenance.

[0040] The second approach is to integrate the heating box into the mold's cooling box piping. This can be connected to the production control system via a PLC or other control method. This allows for water flow control based on actual conditions. To prevent large amounts of warm liquid from entering the cooling box, or cooling liquid from entering the heating box, the heating box must be in standby mode when the cooling box is connected, meaning that warm liquid does not circulate within the mold. When the heating box is connected, the cooling box must be in standby mode, meaning that cooling liquid does not circulate within the mold.

[0041] By controlling the water temperature in the heating box and the timing and duration of passing cooling and warm liquids through the mold, condensed water on the mold cavity surface can be removed, while maximizing the cooling effect of the mold.

[0042] It should be noted that during the switching process between the cooling and heating tanks, residual liquid may remain in the mold and piping. This residual liquid will flow into the liquid tank after the switch. Due to the difference in liquid temperature before and after the switch, especially when the piping is long and the residual liquid is high, the temperature of the liquid in the liquid tank after the switch is affected. This can affect the subsequent cooling of the product or heating of the mold.

[0043] To address this technical issue, a temperature detector can be installed at the mold outlet to detect the temperature of the liquid at the outlet. Thus, once the mold is connected to the cooling tank, the first and fourth control valves can be controlled to open. This allows the cooling liquid to flow into the mold, and the remaining warm liquid in the pipeline flows back to the heating tank without flowing into the cooling tank. At the same time, the temperature detector can be used to detect the temperature of the liquid at the outlet in real time. When a change in the temperature of the liquid at the outlet is detected, it indicates that the cooling liquid has flowed to the outlet and the remaining warm liquid in the pipeline has been essentially replaced by the cooling liquid. At this point, the fourth control valve can be controlled to close, while the third control valve can be controlled to open, thereby achieving circulation of the cooling liquid in the cooling tank.

[0044] Alternatively, in order to achieve precise control, or if the pipeline between the mold outlet and the fourth interface connected to the second liquid return port of the heating box is long, the flow rate of the cooling liquid can be determined based on the rotational speed of the first circulating pump. The length of the pipeline between the mold outlet and the fourth interface can also be determined. Based on the pipeline length and flow rate, the time it takes for the cooling liquid to flow to the fourth interface can be calculated. In this way, when a change in the liquid temperature at the outlet is detected, the timer can be started until the calculated time is reached. At this time, the fourth control valve can be controlled to close, while the third control valve can be controlled to open.

[0045] Similarly, if the mold is connected to the heating box, the second and third control valves can be first controlled to open. This allows the warm liquid to flow into the mold and the remaining cooling liquid in the pipeline to flow back to the cooling box, rather than into the heating box. Simultaneously, a temperature detector can be used to monitor the temperature of the liquid at the outlet in real time. When a change in the liquid temperature at the outlet is detected, it indicates that the warm liquid has flowed to the outlet and the remaining cooling liquid in the pipeline has been substantially replaced by the warm liquid. At this point, the flow rate of the warm liquid can be determined based on the rotational speed of the second circulation pump. The length of the pipeline between the mold outlet and the third interface can also be determined. Based on the pipeline length and flow rate, the time it takes for the warm liquid to flow to the third interface can be calculated. Thus, when a change in the liquid temperature at the outlet is detected, a timer can be started until the calculated time is reached. At this point, the third control valve can be controlled to close, while the fourth control valve can be controlled to open, thereby enabling the circulation of the warm liquid in the heating box.

[0046] The above control method can reduce or avoid mixing of liquids at different temperatures when switching between the cooling and heating boxes. This helps reduce the fluctuation of liquid temperature changes and ensures the effectiveness and efficiency of subsequent product cooling or mold heating.

[0047] The above descriptions are merely some preferred embodiments of the present disclosure and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the utility model disclosed herein is not limited to the technical solutions formed by a specific combination of the above-mentioned technical features, but should also encompass other technical solutions formed by any combination of the above-mentioned technical features or their equivalents without departing from the concept of the utility model. For example, a technical solution formed by replacing the above-mentioned features with (but not limited to) technical features with similar functions disclosed in the embodiments of the present disclosure.

Claims

1. A new mold device for producing fuel tanks, characterized in that: The novel mold device comprises: A mold having an injection molding cavity and a pipe for liquid circulation formed therein, the pipe being arranged around the cavity, and an inlet and an outlet being provided on the outer surface of the mold, respectively connected to the two ends of the pipe; A cooling box is used to transport cooling liquid into the pipeline of the mold, and the first liquid inlet and the first liquid return port of the cooling box are respectively connected to the inlet and the outlet of the mold through pipelines; A heating box is used to transport warm liquid into the pipeline of the mold, and is provided with a heater and a temperature detector. The second liquid inlet and the second liquid return port of the heating box are respectively connected to the inlet and outlet of the mold through pipelines; Wherein, a control valve is further provided on the pipeline connecting the mold and the cooling box and the heating box, for controlling the on-off of the mold and the cooling box and the heating box.

2. The novel mold device according to claim 1 is characterized in that: The first liquid inlet is connected to the inlet pipeline at a first interface, and the second liquid inlet is connected to the inlet pipeline at a second interface; The first liquid return port is connected to the outlet pipeline at a third interface, and the second liquid return port is connected to the outlet pipeline at a fourth interface.

3. The novel mold device according to claim 2, characterized in that: A first control valve is provided between the first liquid inlet and the first interface, a second control valve is provided between the second liquid inlet and the second interface, a third control valve is provided between the first liquid return port and the third interface, and a fourth control valve is provided between the second liquid return port and the fourth interface.

4. The novel mold device according to claim 2, characterized in that: A fifth control valve is set at the first target interface, and a sixth control valve is set at the second target interface, wherein the fifth control valve and the sixth control valve are three-way control valves, the first target interface is the interface between the first interface and the second interface, which is close to the inlet of the mold, and the second target interface is the interface between the third interface and the fourth interface, which is close to the outlet of the mold.

5. The novel mold device according to claim 3, characterized in that: The interior of the heating box is divided into a liquid inlet area and a liquid return area, the second liquid inlet and the heater are arranged in the liquid inlet area, the second liquid return port is arranged in the liquid return area, and the liquid return area is also provided with a liquid replenishing interface; A filter element is provided between the liquid inlet area and the liquid return area for filtering the liquid flowing from the liquid return area into the liquid inlet area.

6. The novel mold device according to claim 5, characterized in that: A first circulation pump is provided at the first liquid inlet, and a second circulation pump is provided at the second liquid inlet; The second circulation pump is also connected to the liquid return area of ​​the heating box through a circulation pipeline, wherein the interface connected to the circulation pipeline is located between the second circulation pump and the second control valve; The circulation pipeline includes a first sub-pipeline and a second sub-pipeline connected in parallel, the first sub-pipeline is provided with a pressure relief valve, and the second sub-pipeline is provided with a circulation control valve, wherein when the second control valve and the fourth control valve are opened, the circulation control valve is closed.

7. The novel mold device according to claim 6, characterized in that: The bottoms of the liquid inlet area and the liquid return area of ​​the heating box are respectively provided with drain valves; and A manual valve is provided between the second liquid inlet and the second control valve, the manual valve is located between the interface connecting the circulation pipeline and the second control valve, and a manual valve is provided at the inlet of the circulation pipeline; A manual valve is provided between the second liquid return port and the fourth control valve.

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