CN119116305A

CN119116305A - New mold device and control method for producing fuel tanks

Info

Publication number: CN119116305A
Application number: CN202411254769.6A
Authority: CN
Inventors: 梁卫华; 汤洋
Original assignee: Zhejiang Xingchang Automotive Technology Co ltd
Current assignee: Zhejiang Xingchang Automotive Technology Co ltd
Priority date: 2024-09-09
Filing date: 2024-09-09
Publication date: 2024-12-13

Abstract

Embodiments of the present disclosure disclose a novel mold apparatus and control method for producing a fuel tank. The novel die device comprises a die, a cooling box, a first liquid inlet, a first liquid return port, a heating box, a heater and a temperature detector, wherein a cavity and a pipeline are formed in the die, the pipeline is arranged around the cavity, an inlet and an outlet are formed in the outer surface of the die and are respectively connected with two ends of the pipeline, the first liquid inlet and the first liquid return port are respectively connected with the inlet and the outlet of the die through pipelines, the heater and the temperature detector are arranged in the heating box, a second liquid inlet and a second liquid return port of the heating box are respectively connected with the inlet and the outlet of the die through pipelines, and in the process of producing a fuel tank, the inlet of the die is only communicated with the cooling box or the heating box at the same time. The mold device can reduce the temperature difference between the mold cavity and the environment (especially summer) by being connected with the heating box, so as to avoid the generation of condensed water, thereby reducing the reject ratio of uneven product surface.

Description

Novel die device for producing fuel tank and control method

Technical Field

Embodiments of the present disclosure relate to the field of fuel tank production technology, and in particular, to a novel mold apparatus and control method for producing a fuel tank.

Background

The plastic molding processing industry typically requires the use of a wide variety of molds for manufacturing. In order to improve the production efficiency, a water channel is usually arranged in the die, and cold water is introduced for cooling. However, due to the problem of environmental humidity, a large amount of condensed water is usually generated on the surface of the die cavity in summer, so that the appearance of the product is not smooth enough, and marks of the condensed water are formed. In the production and manufacturing process of the automobile fuel tank, the problem of uneven product surface caused by condensed water is particularly prominent.

In the process of solving the technical problems by adopting the technical scheme, the following technical problems are often accompanied:

The second technical problem is that the determined technological parameters are always fixed in a period of time (such as the same season or one day) during actual production. However, the temperatures during the day and night are also typically different. That is, the ambient temperature is constantly changing. Therefore, the cooling effect of the product or the heating effect of the die cavity cannot be guaranteed, and the stability of the production quality of the product can be affected.

The third technical problem is that in the process of switching the cooling box and the heating box, residual liquid can be reserved in the mould and the pipeline. This remaining liquid will flow into the switched liquid tank. The liquid temperature in the liquid tank after switching is affected because the liquid temperature is different before and after switching, especially when the pipeline is longer and the residual liquid is more. This can affect the effect of subsequent product cooling or mold heating.

The above information disclosed in this background section is only for enhancement of understanding of the background of the disclosed concept and, therefore, it may contain information that does not form the prior art that is known to those of ordinary skill in the art in this country.

Disclosure of Invention

The disclosure is in part intended to introduce concepts in a simplified form that are further described below in the detailed description. The disclosure is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used to limit the scope of the claimed subject matter. Some embodiments of the present disclosure provide a novel mold device for producing a fuel tank and a control method for producing a fuel tank, which can effectively reduce the occurrence of condensed water in a mold cavity in summer, thereby being capable of reducing the problem of uneven surface of the produced fuel tank, and being beneficial to improving the production quality and yield of the fuel tank.

According to the first aspect, some embodiments of the present disclosure provide a novel mold device for producing a fuel tank, comprising a mold, wherein an injection molding cavity is formed in the mold, a pipeline for circulating liquid flows is arranged around the cavity, an inlet and an outlet are formed in the outer surface of the mold and are respectively connected with two ends of the pipeline, a cooling tank is used for conveying cooling liquid into the pipeline of the mold, a first liquid inlet and a first liquid return of the cooling tank are respectively connected with the inlet and the outlet of the mold through pipelines, a heating tank is used for conveying warm liquid into the pipeline of the mold, a heater and a temperature detector are arranged in the heating tank, a second liquid inlet and a second liquid return of the heating tank are respectively connected with the inlet and the outlet of the mold through pipelines, and the inlet of the mold is communicated with only one of the cooling tank and the heating tank at the same time in the process of producing the fuel tank.

In some embodiments, a control valve is further arranged on the pipeline connected with the cooling box and the heating box and used for controlling the on-off of the mould, the cooling box and the heating box, the first liquid inlet is connected with the inlet pipeline at a first interface, the second liquid inlet is connected with the inlet pipeline at a second interface, the first liquid return port is connected with the outlet pipeline at a third interface, and the second liquid return port is connected with the outlet pipeline at a fourth interface.

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

In some embodiments, a fifth control valve is disposed at the first target interface, and a sixth control valve is disposed 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 one of the first interface and the second interface, which is close to the inlet of the mold, and the second target interface is one of the third interface and the fourth interface, which is close to the outlet of the mold.

In some embodiments, the interior of the heating box is divided into a liquid inlet area and a liquid return area, a second liquid inlet and a heater are arranged in the liquid inlet area, a second liquid return opening is arranged in the liquid return area, a liquid supplementing interface is further arranged in the liquid return area, and a filtering element is arranged between the liquid inlet area and the liquid return area and used for filtering liquid flowing into the liquid inlet area from the liquid return area.

In some embodiments, a first circulating pump is arranged at the first liquid inlet, a second circulating pump is arranged at the second liquid inlet, the second circulating pump is further connected with a liquid return area of the heating box through a circulating pipeline, an interface connected with the circulating pipeline is located between the second circulating pump and a second control valve, the circulating pipeline comprises a first sub-pipeline and a second sub-pipeline which are connected in parallel, a pressure relief valve is arranged on the first sub-pipeline, a circulating control valve is arranged on the second sub-pipeline, and when the second control valve and the fourth control valve are opened, the circulating control valve is closed.

In some embodiments, the bottoms of the liquid inlet area and the liquid return area of the heating box are respectively provided with a liquid discharge valve, a manual valve is arranged between the second liquid inlet and the second control valve, the manual valve is arranged between an interface for connecting the circulating pipeline and the second control valve, a manual valve is arranged at the inlet of the circulating pipeline, and a manual valve is arranged between the second liquid return port and the fourth control valve.

In a second aspect, some embodiments of the present disclosure provide a control method for producing a fuel tank, comprising determining a cooling temperature of cooling liquid in a cooling tank of a novel mold apparatus according to an injection molding temperature and an ambient temperature, and refrigerating the cooling liquid to the cooling temperature, in response to determining that a mold in the novel mold apparatus has been clamped, controlling an inlet of the mold to communicate with a first liquid inlet of the cooling tank to cool a product in the mold using the cooling liquid before injection molding of the product, determining a heating temperature of warm liquid in a heating tank of the novel mold apparatus according to a temperature of a mold cavity and the ambient temperature, and heating the warm liquid to the heating temperature, in response to setting a time period before injection molding of the product is completed, controlling an inlet of the mold to communicate with a second liquid inlet of the heating tank to heat the mold using the warm liquid, wherein the novel mold apparatus adopts the structure of the novel mold apparatus described in any one of the above implementations.

In some embodiments, the control method further comprises controlling the first control valve and the third control valve to open and the second control valve and the fourth control valve to close while communicating the inlet of the mold with the first liquid inlet of the cooling tank, controlling the second control valve and the fourth control valve to open and controlling the first control valve and the third control valve to close while communicating the inlet of the mold with the second liquid inlet of the heating tank, and controlling the second control valve and the fourth control valve to close in response to determining that the temperature of the mold cavity reaches a set temperature, and controlling the mold to open, wherein the set temperature is determined based on the ambient temperature.

The novel die device for producing the fuel tank has the beneficial effects that by adding the heating box, the temperature control of the cavity in the die can be realized by adopting a mode that cooling liquid and warm liquid alternately pass through the pipeline in the die. When the mould is in the production process, the mould can be connected with a cooling tank, so that the cooling liquid can be used for cooling the product. Before the end of the production of the mould product, the mould can be switched in advance to be connected with the heating box, so that the surface of the mould can reach a proper temperature by using warm liquid. In this way, the creation of condensation on the cavity surface can be reduced or avoided when the mold cavity is exposed to air. And when the next product is produced, the phenomenon that the appearance of the product is not smooth enough and has condensate marks caused by condensate can be reduced, so that the reject ratio of the product is effectively reduced.

Drawings

The above and other features, advantages, and aspects of embodiments of the present disclosure will become more apparent by reference to the following detailed description when taken in conjunction with the accompanying drawings. The same or similar reference numbers will be used throughout the drawings to refer to the same or like elements. It should be understood that the figures are schematic and that elements and components are not necessarily drawn to scale.

FIG. 1 is a schematic structural view of some embodiments of the novel mold apparatus of the present disclosure;

FIG. 2 is a schematic structural view of some embodiments of a heating box in the novel mold apparatus of the present disclosure;

Fig. 3 is a flow chart of some embodiments of the control method of the present disclosure.

Detailed Description

Embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While certain embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete. It should be understood that the drawings and embodiments of the present disclosure are for illustration purposes only and are not intended to limit the scope of the present disclosure.

It should be noted that, for convenience of description, only the portions related to the present invention are shown in the drawings. Embodiments of the present disclosure and features of embodiments may be combined with each other without conflict.

It should be noted that the terms "first," "second," and the like in this disclosure are merely used to distinguish between different devices, modules, or units and are not used to define an order or interdependence of functions performed by the devices, modules, or units.

It should be noted that references to "one", "a plurality" and "a plurality" in this disclosure are intended to be illustrative rather than limiting, and those of ordinary skill in the art will appreciate that "one or more" is intended to be understood as "one or more" unless the context clearly indicates otherwise.

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

Fig. 1 shows a schematic structural view of some embodiments of the novel die apparatus for producing fuel tanks of the present disclosure. As shown in fig. 1, the novel mold device may include a mold, a cooling tank, and a heating tank. Here, the interior of the mold may be formed with a cavity and a duct, not shown in the drawing. The shape structure of the cavity is matched with the shape structure of the fuel tank, and the cavity is used for blow molding of the fuel tank. And a conduit loop may be provided around the mould cavity for the circulating flow of liquid. And the outer surface of the die may be provided with an inlet and an outlet, respectively connected with both ends of the pipe.

Here, a cooling tank is generally used to convey cooling liquid into the pipes 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 with an inlet of the die through a pipeline. And the first liquid return port B can be connected with an outlet of the die through a pipeline. While a heating tank is typically used to deliver warm liquid into the tubing of the mold. The inside of the heating box may be provided with a heater and a temperature detector. Wherein the heater can heat the liquid in the heating tank. The temperature detector may detect the temperature of the liquid in the heating tank. In addition, the heating box can be provided with a second liquid inlet C and a second liquid return port D. The second liquid inlet C can be connected with an inlet of the die through a pipeline. The second liquid return port D can be connected with the outlet of the die through a pipeline.

It should be noted that the liquid in the cooling tank and the heating tank may be set according to actual requirements. For example, in order to reduce the production cost, ordinary water may be used here. For example, in order to improve the heat conduction efficiency and shorten the production time, a mixed liquid of water and other liquid may be used. Because there is mixing of the liquids during use, the cooling liquid and the warming liquid are typically the same liquid.

It will be appreciated that the mould for blow moulding of fuel tanks typically comprises two parts. When the two parts are clamped, a complete cavity can be formed inside the die so as to produce the fuel tank. After the production of the fuel tank is completed, the two parts can be opened by opening the mould, so that the produced fuel tank is taken out for the next production. In this case, in order to ensure uniformity of cooling, pipes may be provided in both mold parts. And the end faces of the two-part mould towards each other may be provided with a pipe interface. Thus, after the die is closed, the pipelines in the two-part die can be communicated through the pipeline interface. At this time, the outer surface of one of the two-part molds may be provided with an inlet, and the outer surface of the other mold may be provided with an outlet.

Optionally, to further increase the cooling efficiency, both the two-part mold may be provided with an inlet and an outlet for connection to the respective internal pipes. This allows for the simultaneous and separate delivery of cooling liquid into the two-part mold. The temperature of the liquid input into the two-part mold is the same, so that the cooling uniformity can be further improved, and the cooling and production efficiency of the product can be improved.

It will be appreciated that during the production of the fuel tank, the inlet of the mould is at the same time typically in communication with only one of the cooling or heating tanks. That is, during the production process, the mold inner pipe flows only the cooling liquid, or only the warm liquid. Typically, cooling liquids are used to cool the product during the production process. Whereas the warm liquid is used for warming up the mould to reduce the temperature difference between the mould (especially the mould cavity) and the environment. Therefore, the situation that condensate water is generated on the surface of the cavity due to temperature difference after die opening can be reduced or avoided. Thus, only one liquid is delivered to the mold at a time.

As can be seen from the above description, the novel mold device for producing a fuel tank of the present disclosure can realize temperature control of a cavity in a mold by adding a heating tank in such a manner that cooling liquid and warm liquid alternately pass through a pipe in the mold. When the mould is in the production process, the mould can be connected with a cooling tank, so that the cooling liquid can be used for cooling the product. Before the end of the production of the mould product, the mould can be switched in advance to be connected with the heating box, so that the surface of the mould can reach a proper temperature by using warm liquid. In this way, the creation of condensation on the cavity surface can be reduced or avoided when the mold cavity is exposed to air. And when the next product is produced, the phenomenon that the appearance of the product is not smooth enough and has condensate marks caused by condensate can be reduced, so that the reject ratio of the product is effectively reduced. In addition, before the next product is produced, the mold and the cooling box can be switched again to be connected, so that the mold enters an optimal cooling state for molding operation.

Here, the switching of the mold to the cooling tank or the heating tank may be achieved in various ways. As an example, at least one interface may be provided on the pipe at the inlet of the mold, and connectors adapted to the interfaces may be provided on the pipes connected to the first liquid inlet of the cooling tank and the second liquid inlet of the heating tank, respectively. In the switching process, the drive assembly can be used for realizing the plug connection of different connectors and interfaces, so that the switching of different liquids is realized. For example, two interfaces may be symmetrically arranged on the pipeline to connect with two connectors respectively. The driving assembly can be arranged at the position below the pipeline corresponding to the interface and comprises a driver, a driving track and a driving block. The two joints may be located at both ends of the driving block, respectively. When the driving block moves to the other end along the driving track, the connection between the other joint and the corresponding interface can be realized, so that liquid switching is realized. Similarly, the pipeline at the outlet of the die can also adopt the structure, thereby realizing the plug connection with the first liquid return port of the cooling tank and the second liquid return port of the heating tank.

Optionally, in order to simplify the structure of the device, a control valve can be further arranged on a pipeline connecting the mold with the cooling tank and the heating tank. The control valve can be used for controlling the on-off of the mould, the cooling box and the heating box. I.e. the control valve can be used to control the adjustment of the liquid flowing into the mould pipe.

It will be appreciated that the structural type and mounting location of the control valve described above may be set as desired. In some embodiments, as shown in fig. 1, the first inlet a and the inlet line may be connected at a first interface. And the second inlet C and inlet line may be connected at a second interface. Wherein the inlet line is typically a line connected to the inlet of the mould. The first interface and the second interface may be the same-position interface or different-position interfaces. In addition, the first liquid return port B and the outlet pipe may be connected at a third port. And the second liquid return port D and the outlet pipeline can be connected at a fourth port. Wherein the outlet line is typically a line connected to the outlet of the mould. The third interface and the fourth interface may be the same-position interface or may be different-position interfaces.

In this case, as shown in fig. 1, a first control valve (i.e., valve one) may be provided between the first liquid inlet a and the first port. And a second control valve (namely a second valve) is arranged between the second liquid inlet C and the second interface. In addition, a third control valve (i.e., valve three) may be provided between the first liquid return port B and the third port. And a fourth control valve (valve four) may be provided between the second liquid return port D and the fourth port. The first to fourth control valves herein may be one-way control valves. In addition, these control valves may be electric valves for the purpose of automated production.

Optionally, to reduce the number of components in the device, a fifth control valve may also be provided at the first target interface, while a sixth control valve may be provided at the second target interface. The fifth control valve and the sixth control valve may be three-way control valves. One end of the three-way control valve is connected with the die, and the other two ends of the three-way control valve are respectively connected with the cooling box and the heating box. Here, the first target interface is typically an interface near the entrance of the mold, of the first interface and the second interface. The second target interface is typically the interface between the third interface and the fourth interface, which is closer to the outlet of the mold.

In some application scenarios, in order to realize the circulation flow of the liquid, a circulation pump may be disposed on a pipeline where the mold is connected with the cooling tank and the heating tank. As an example, the circulation pump may be provided at the inlet of the mold. Namely, the circulating pump is positioned between the interface for connecting the first liquid inlet and the second liquid inlet and the inlet of the mould.

Further, as shown in fig. 2, the interior of the heating tank may be divided into a liquid inlet region J and a liquid return region H. The second liquid inlet C and the heater may be provided in the liquid inlet region. The second liquid return port D may be provided in the liquid return region H. And a filter element G is arranged between the liquid inlet area J and the liquid return area H. The filter element G may be used to filter liquid flowing from the liquid return zone H into the liquid inlet zone J. Therefore, the impurity content in the pipeline can be effectively reduced, and the smooth flow of the liquid is ensured. It will be appreciated that with continuous production, there will be a reduced evaporation of liquid when the heater in the heating tank is continuously heated, so as shown in fig. 2, a liquid replenishing port may be further provided in the liquid return area H and connected to a water replenishing pipe for replenishing liquid into the heating tank.

It will be appreciated that prior to connection of the mould to the heating box, a review will require the use of a heater to heat the warmed liquid therein to a specified temperature. Here, in order to ensure uniformity of the temperature of the liquid in the heating tank, it is generally necessary to install a circulation pump at the end of the heating tank to achieve internal circulation flow of the liquid in the heating tank during the heating process. In this case, a first circulation pump may be provided at the first liquid inlet a. And a second circulating pump is arranged at the second liquid inlet C. The first circulating pump is used for realizing circulating flow of cooling liquid when the die is connected with the cooling box. The second circulating pump is used for realizing the circulating flow of the warm liquid when the die is connected with the heating box.

In addition, the second circulation pump is also used for the internal circulation of the liquid in the heating box. At this time, the second circulation pump may be connected to the liquid return region of the heating tank through a circulation line. Here, the interface connected to the liquid return area may be the same interface as the second liquid return port D, or may be a different interface. In order to ensure that the liquid in the heating tank can circulate normally in both states, as shown in fig. 2, the connection to the circulation line is usually located between the second circulation pump and the second control valve. Thus, no matter whether the heating box is connected with the die or not, the circulation flow of the warm liquid can be realized under the action of the second circulating pump.

Further, the circulation line may include a first sub-line and a second sub-line connected in parallel. The first sub-pipeline is provided with a pressure relief valve. The pressure relief valve can avoid the too big water pressure of pipeline, guarantees production safety. And the second sub-line is provided with a circulation control valve, valve C in fig. 2. When the liquid in the heating tank is internally circulated, a circulation control valve is usually opened. And when the second control valve and the fourth control valve are opened, i.e. the heating tank is connected to the mould, the circulation control valve is normally closed.

In some embodiments, to facilitate repair and maintenance of the novel mold apparatus, the bottoms of the liquid inlet zone J and the liquid return zone H of the heating tank may be provided with liquid discharge valves, respectively. The liquid in the heating box can be discharged through the liquid discharge valve, so that the cleaning of the inside of the heating box, the replacement of the filter element and the like are facilitated. And for safety and maintenance, a manual valve can be arranged on the pipeline, so that manual closing is realized. For example, a manual valve may be provided between the second liquid inlet C and the second control valve. And the manual valve is positioned between the interface of the connecting circulation pipeline and the second control valve. And a manual valve can be arranged between the second liquid return port D and the fourth control valve. Thus, when the heating box needs maintenance, the manual valves at the two positions can be manually closed. In addition, a manual valve can be arranged at the inlet of the circulating pipeline. Thereby being convenient for the maintenance and repair of the circulating pipeline.

In addition, a drain valve may be provided at the bottom of the cooling tank. Meanwhile, water level detection components can be arranged in the cooling box and the heating box. Thus, when the liquid in the tank reaches the set water level, the drain valve can be controlled to be opened, so that the redundant liquid in the tank is drained. When the liquid in the tank is smaller than the set water level, the liquid discharge valve can be controlled to be closed.

From the above description, the novel mold device of the present disclosure is mainly divided into two parts:

Firstly, a layout heating box control system. The liquid in the heating box is heated and controlled by the heater. And heating is started when the set temperature is not reached through temperature feedback, and heating is stopped after the set water temperature is reached. Meanwhile, a filter screen is additionally arranged in the heating box and is used for filtering impurities in the liquid. The liquid in the heating box is sent into the mould by the circulating pump for heat exchange. When the second control valve and the fourth control valve of the heating box are opened and the circulation control valve is closed, the warm liquid is conveyed through the die by the circulation pump and then returns to the inside of the heating box, so that heat exchange circulation is formed. When the second control valve and the fourth control valve of the heating box are closed and the circulation control valve is opened, the warm liquid circulates the liquid inside the heating box through the circulation pump, so that the uniformity of the temperature inside the heating box is ensured. Meanwhile, a safety valve (namely a pressure relief valve) is added, so that the occurrence of safety accidents caused by overlarge pipeline water pressure is avoided. In addition, a tool set for maintenance such as water replacement and the like is reserved on the pipeline.

And secondly, a heating box is integrated into a cooling box pipeline used by the die. And the production control system is accessed by a PLC or other control modes. The water can be controlled according to the actual situation. To avoid a large amount of warm liquid from entering the cooling tank or cooling liquid from entering the heating tank. When the cooling box is used in connection, the heating box is in a standby state, namely, the warm liquid does not participate in the internal circulation of the die. When the heating box is needed to be connected, the cooling box is in a standby state, namely the cooling liquid does not participate in the internal circulation of the die.

The removal of condensate water on the surface of the die cavity can be realized by controlling the water temperature of the heating box and the time and duration of the cooling liquid and the warm liquid for the die. Meanwhile, the cooling effect of the die can be ensured to the greatest extent.

With continued reference to fig. 3, a flow 300 of some embodiments of the control method of the present disclosure for producing a fuel tank is shown. The method may comprise the steps of:

Step 301, determining a cooling temperature of cooling liquid in a cooling tank of the novel mold device according to the injection molding temperature and the environmental temperature, and refrigerating the cooling liquid to the cooling temperature.

In some embodiments, a temperature detector may be provided in a production environment in which the production facility is located. The temperature detector may send the detected ambient temperature to the production facility. Or the operator may input the ambient temperature through the operating interface of the production facility. In addition, the operator can also input the injection molding temperature through the operation interface. In this way, the execution body of the control method, such as the controller of the production apparatus, can determine the cooling temperature of the cooling liquid in the cooling tank of the novel mold device. And after the cooling temperature is determined, the cooling liquid can be cooled to the cooling temperature by controlling the refrigerating part in the cooling tank to cool the injection product in the mold. Wherein the novel mold device may adopt the structure of the novel mold device in the above-described embodiment.

It will be appreciated that in the case of constant ambient temperature, generally the higher the injection temperature, i.e. the greater the difference between the two temperatures, the lower the cooling temperature. In the case of an unchanged injection molding temperature, the higher the ambient temperature, i.e. the smaller the difference between the two temperatures, the lower the cooling temperature.

In response to determining that the mold in the new mold apparatus has been closed, the inlet of the mold is controlled to communicate with the first liquid inlet of the cooling tank to cool the product within the mold with a cooling liquid prior to injection of the product, step 302.

In some embodiments, the inlet of the mold may be controlled to communicate with the first liquid inlet of the cooling tank to allow cooling liquid to flow into the conduits inside the mold prior to determining that the mold in the new mold apparatus has been closed and prior to injection of the product. In this way, the cooling liquid can be used to cool the product in the mold during the injection molding process. As an example, in this case, the controller may control the first control valve and the third control valve to be opened, and control the second control valve and the fourth control valve to be closed.

Step 303, determining the heating temperature of the warm liquid in the heating box of the novel mold device according to the temperature of the mold cavity and the environmental temperature, and heating the warm liquid to the heating temperature.

It will be appreciated that the purpose of the disclosed embodiments is to provide a heating box, primarily for heating the mold, and in particular the cavity of the mold. So that the temperature difference between the mold cavity and the environment is reduced under the condition that the mold cavity is exposed to the working environment after the mold is opened. Thereby reducing or avoiding a large amount of condensed water generated on the surface of the cavity. Thus in some embodiments, a temperature detector may also be provided on the mould for detecting the temperature of the mould. The temperature detector can penetrate through the hole into the die to be close to the die cavity, so that the temperature of the approximate die cavity is detected.

Since during the production process, the cooling liquid flows in the front mold. Thus, there is a temperature difference between the inside of the mold and the environment, especially in summer. Here, the heating temperature of the warm liquid in the heating tank of the novel mold device can be determined based on the temperature of the mold cavity and the ambient temperature. The heater in the heating tank may then be controlled to heat the liquid to heat the warm liquid to a determined heating temperature. In general, the larger the temperature difference between the two, the higher the heating temperature.

It should be noted that, during the production process, the ambient temperature is continuously changed, for example, the ambient temperature is different throughout the year. For this case, repeated testing is often required prior to mass production to determine the production process parameters at different ambient temperatures. Thus not only can waste resources be caused, but also the production period can be seriously influenced. Furthermore, in actual production, the determined process parameters tend to be fixed for a period of time (e.g., the same season or day). However, the temperatures during the day and night are also typically different. That is, the ambient temperature is constantly changing. Therefore, the cooling effect of the product or the heating effect of the die cavity cannot be guaranteed, and the stability of the production quality of the product can be affected.

In order to solve the second technical problem, the cooling temperature and the heating temperature can be predicted and judged through a machine learning model, so that the dynamic adjustment control of production is realized. Specifically, training data may be constructed by first collecting actual production data or acquiring relevant data from a common resource. The training data may include sample temperatures and corresponding process parameter labels. The sample temperature may include, among other things, a sample injection molding temperature, a sample ambient temperature, and a sample cavity temperature. The sample ambient temperature here may include not only ambient temperatures of different seasons, but also ambient temperatures of different time periods during the day. And the process parameter label may include a sample cooling temperature and a sample heating temperature.

Here, the sample temperature may be input into the model so that the model learns the correlation between these temperature data. And the model parameters may be adjusted using the loss function values between the model predicted process parameters and the corresponding process parameter labels. The model herein may include an input layer, a first sub-model, a second sub-model, and an output layer. The input layer is used for analyzing the input time of the input data and vectorizing the input data, so that the vectorized input data is sent to the corresponding model layer according to the analysis result. The first sub-model is used for learning the association relation of the sample temperature in different seasons. And a second sub-model may be used to learn the relationship of sample temperature at different time periods during the day. The two sub-models may employ various machine learning model structures, such as a linear regression model (Linear Regression) or a time series model, such as an autoregressive moving average model (ARMA, auto Regression Moving Average), or a Long Short-Term Memory network (LSTM), or the like. The output layer is used for outputting the prediction result of the model. The loss function can be obtained by weighting and summing according to the prediction results of the two sub-models.

Thus, at the beginning of a day, the controller may first input the current time, injection molding temperature, and ambient temperature into the trained model. At this time, the season corresponding to the current time (date) may be determined using the first sub-model, thereby predictively determining the initial cooling temperature and heating temperature. As production proceeds, the controller may continue to input the current time, injection molding temperature, and ambient temperature into the trained model. The second sub-model may then be used to determine the time period of the current time (the particular moment) during the day, thereby predictively determining the adjusted cooling and heating temperatures. The dynamic adjustment of the production process parameters is realized through large model prediction, so that the accuracy of parameter adjustment can be ensured, the resource and time consumption can be reduced, and the stability of the production quality can be ensured.

It will be appreciated that new production processes are occurring or that production processes are changing, such as injection molding temperatures. The above-described trained model can also be used to predict the cooling temperature and the heating temperature. Therefore, the testing process before batch production can be omitted, or the testing times can be reduced, so that the resource waste can be reduced, and the production period can be shortened.

And step 304, responding to the set time before the injection of the product is completed, and controlling the inlet of the mold to be communicated with the second liquid inlet of the heating box so as to heat the mold by using the warm liquid.

In some embodiments, the inlet of the mold may be controlled to communicate with the second liquid inlet of the heating box for a set period of time before the injection of the product is completed, thereby allowing the warmed liquid to flow into the conduit inside the mold. In this way, the mould (especially the cavity) can be heated by the warm liquid before the mould is opened, so that the difference between the temperature and the ambient temperature is reduced. As an example, in this case, the controller may control the second control valve and the fourth control valve to be opened, and control the first control valve and the third control valve to be closed. The set time period may be set according to actual situations. It can be appreciated that the mold is heated in advance before the injection of the product is completed, so that synchronous execution of different production procedures can be realized, the time occupied by the heating procedure is reduced, and the influence of process improvement on the production efficiency is further reduced.

Further, in the case where it is determined that the temperature of the mold cavity reaches the set temperature, the second control valve and the fourth control valve may be controlled to be closed. And the die opening of the die can be controlled to take out the injection molding product and carry out the production of the next product. Wherein the set temperature is typically determined based on the ambient temperature. As an example, the set temperature may be an ambient temperature. For another example, while avoiding the generation of condensate in the mold cavity, the energy consumption is reduced as much as possible, and the set temperature may be smaller than the ambient temperature by a certain difference.

During the switching between the cooling tank and the heating tank, the mold and the piping remain with the remaining liquid. This remaining liquid will flow into the switched liquid tank. The liquid temperature in the liquid tank after switching is affected because the liquid temperature is different before and after switching, especially when the pipeline is longer and the residual liquid is more. This can affect the effect of subsequent product cooling or mold heating.

To solve this third technical problem, a temperature detector may be provided at the outlet position of the die for detecting the temperature of the liquid at the outlet. In this way, in the case where it is determined to communicate the mold with the cooling tank, the first control and the fourth control valve can be controlled to be opened first. So that the cooling liquid flows into the mould and the remaining warm liquid in the line flows back into the heating tank without flowing into the cooling tank. Meanwhile, the temperature detector can be utilized 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 is indicated that cooling liquid has flowed to the outlet and that the remaining warm liquid in the line has been substantially replaced by cooling liquid. At this time, the fourth control valve may be controlled to be closed, while the third control valve is controlled to be opened, thereby realizing circulation of the cooling liquid in the cooling tank.

Optionally, in order to achieve accurate control, or the pipeline between the outlet of the die and the fourth interface connecting the second liquid return port of the heating tank is long, at this time, the flow rate of the cooling liquid may be determined according to the rotation speed of the first circulation pump. And determining the length of the tubing between the outlet of the die and the fourth port. So that the length of time for the cooling liquid to flow to the fourth port can be calculated based on the length and flow rate of the pipe. In this way, when a change in the temperature of the liquid at the outlet is detected, a timer can be started until the calculated time period is reached. The fourth control valve may be controlled to close at this time while the third control valve is controlled to open.

Also, in the case where it is determined to communicate the mold with the heating tank, the second control and the third control valve may be controlled to be opened first. So that the warm liquid flows into the mould and the remaining cooling liquid in the line flows back into the cooling tank, but not into the heating tank. Meanwhile, the temperature detector can be utilized 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 is indicated that warm liquid has flowed to the outlet and that the remaining cooling liquid in the line has been substantially replaced by warm liquid. At this time, the flow rate of the warm liquid may be determined according to the rotation speed of the second circulation pump. And determining the length of tubing between the outlet of the die and the third port. So that the length of time for the warm liquid to flow to the third port can be calculated based on the length and flow rate of the pipeline. In this way, when a change in the temperature of the liquid at the outlet is detected, a timer can be started until the calculated time period is reached. At the moment, the third control valve can be controlled to be closed, and the fourth control valve can be controlled to be opened, so that circulation of warm liquid in the heating box is realized.

By the control method, when the cooling box and the heating box are switched, mixing of liquids with different temperatures can be reduced or avoided. Thereby being beneficial to reducing the fluctuation range of the temperature change of the liquid and ensuring the effect and the efficiency of the subsequent cooling of the product or the heating of the die.

The foregoing description is only of the preferred embodiments of the present disclosure and description of the principles of the technology being employed. It will be appreciated by those skilled in the art that the scope of the invention in the embodiments of the present disclosure is not limited to the specific combination of the above technical features, but encompasses other technical features formed by any combination of the above technical features or their equivalents without departing from the spirit of the invention. Such as the above-described features, are mutually substituted with (but not limited to) the features having similar functions disclosed in the embodiments of the present disclosure.

Claims

1. A novel die apparatus for producing a fuel tank, wherein the novel die apparatus comprises:

the device comprises a die, a liquid circulation pipe and a liquid circulation pipe, wherein an injection molding cavity and the liquid circulation pipe are formed in the die;

the cooling box is used for conveying cooling liquid into the pipeline of the die, and the first liquid inlet and the first liquid return port of the cooling box are respectively connected with the inlet and the outlet of the die through pipelines;

The heating box is used for conveying warm liquid into the pipeline of the die, 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 respectively connected with an inlet and an outlet of the die through pipelines;

wherein, during the process of producing the fuel tank, the inlet of the mould is communicated with only one of the cooling tank or the heating tank at the same time.

2. The novel mold device according to claim 1, wherein a control valve is further arranged on a pipeline connecting the mold with the cooling tank and the heating tank for controlling the on-off of the mold with the cooling tank and the heating tank, and

The first liquid inlet is connected with the inlet pipeline at a first interface, and the second liquid inlet is connected with the inlet pipeline at a second interface;

The first liquid return port is connected with the outlet pipeline at a third interface, and the second liquid return port is connected with the outlet pipeline at a fourth interface.

3. The novel mold device of claim 2, wherein a first control valve is disposed between the first liquid inlet and the first interface, a second control valve is disposed between the second liquid inlet and the second interface, a third control valve is disposed between the first liquid return port and the third interface, and a fourth control valve is disposed between the second liquid return port and the fourth interface.

4. The novel mold device of claim 2, wherein a fifth control valve is provided at a first target interface and a sixth control valve is provided at a second target interface, wherein the fifth control valve and the sixth control valve are three-way control valves, the first target interface is one of the first interface and the second interface which is close to an inlet of the mold, and the second target interface is one of the third interface and the fourth interface which is close to an outlet of the mold.

5. The novel mold device according to claim 3, wherein the heating box is internally 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 opening is arranged in the liquid return area, and the liquid return area is further provided with a liquid supplementing interface;

And a filtering element is arranged between the liquid inlet area and the liquid return area and is used for filtering liquid flowing into the liquid inlet area from the liquid return area.

6. The novel mold device of claim 5, wherein 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 circulating pump is also connected with a liquid return area of the heating box through a circulating pipeline, wherein an interface connected with the circulating pipeline is positioned between the second circulating pump and the second control valve;

The circulating pipeline comprises a first sub pipeline and a second sub pipeline which are connected in parallel, a pressure release valve is arranged on the first sub pipeline, and a circulating control valve is arranged on the second sub pipeline, wherein when the second control valve and the fourth control valve are opened, the circulating control valve is closed.

7. The novel mold apparatus according to claim 6, wherein the bottoms of the liquid inlet zone and the liquid return zone of the heating box are respectively provided with a liquid discharge valve, and

A manual valve is arranged between the second liquid inlet and the second control valve, the manual valve is arranged between an interface for connecting the circulating pipeline and the second control valve, and a manual valve is arranged at the inlet of the circulating pipeline;

A manual valve is arranged between the second liquid return port and the fourth control valve.

8. A control method for producing a fuel tank, comprising:

determining a cooling temperature of cooling liquid in a cooling tank of the novel die device according to the injection molding temperature and the environmental temperature, and refrigerating the cooling liquid to the cooling temperature;

In response to determining that a mold in the novel mold apparatus has been closed, prior to injection molding a product, controlling an inlet of the mold to communicate with a first liquid inlet of the cooling tank to cool the product within the mold with the cooling liquid;

Determining a heating temperature of warm liquid in a heating box of the novel mold device according to the temperature of the mold cavity and the environmental temperature, and heating the warm liquid to the heating temperature;

Controlling the inlet of the die to be communicated with the second liquid inlet of the heating box in response to a set time period before the injection of the product is completed so as to heat the die by using the warm liquid;

Wherein the novel mold device adopts the structure of the novel mold device as claimed in any one of claims 1 to 7.

9. The control method according to claim 8, wherein the control method further comprises:

controlling the first control valve and the third control valve to be opened and controlling the second control valve and the fourth control valve to be closed under the condition that an inlet of the mold is communicated with the first liquid inlet of the cooling box;

controlling the second control valve and the fourth control valve to be opened and controlling the first control valve and the third control valve to be closed under the condition that an inlet of the die is communicated with a second liquid inlet of the heating box;

And controlling the second control valve and the fourth control valve to close and controlling the mold to open in response to determining that the temperature of the mold cavity reaches a set temperature, wherein the set temperature is determined according to an ambient temperature.