Multi-piece parison extrusion port core mold structure and two-piece fuel tank parison generation method

Abstract

The embodiment of the present disclosure discloses a multi-piece parison extrusion die core mold structure and a two-piece oil tank parison generation method. A specific implementation of the structure includes: a die, a core mold, a guide cone sleeve and a diverter plate; the interior of the die is a hollow structure, the core mold is arranged inside the die, the narrow end of the guide cone sleeve is embedded in the upper end of the die, and the narrow end of the guide cone sleeve wraps the upper end of the core mold, wherein the annular gap between the die, the core mold and the guide cone sleeve constitutes the parison extrusion flow channel; at least two notches are provided on the side wall of the die, the notches extend along the height direction of the die, the diverter plate is embedded in the parison extrusion flow channel through the notches, and abuts against the core mold to divide the cylindrical parison extrusion flow channel into multiple independent arc-shaped parison extrusion flow channels. The die core mold structure disclosed in the present disclosure can be improved on the traditional die core mold structure, so as to realize the production of two-piece oil tanks. It has a simple structure, high versatility, and does not require the modification of other existing equipment that cooperates with the structure for production, which greatly reduces the modification cost.

Description

Technical Field

[0001] The embodiments of the present disclosure relate to the technical field of fuel tank molding, and in particular to a multi-piece parison extrusion port core mold structure and a two-piece fuel tank parison generation method. Background Art

[0002] As the standards of the automotive industry continue to change, in order to reduce emissions, the method of placing the welded and assembled components on the fuel tank inside the fuel tank, that is, built-in components, is usually adopted to reduce the leakage of hydrocarbons. To this end, it is often necessary to change the traditional cylindrical parison to a two-piece parison.

[0003] However, the existing two-piece parison extrusion process has a high equipment purchase price due to the technical blockade. And due to the complex structure, the equipment maintenance and repair costs are also high. In addition, this equipment has poor versatility and cannot be adapted to other existing equipment, and the transformation cost will also be greatly increased.

[0004] 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. Summary of the invention

[0005] The content section of this disclosure is used to introduce concepts in a brief form, and these concepts will be described in detail in the specific implementation section below. The content section of this disclosure is not intended to identify the key features or necessary features of the technical solution for which protection is sought, nor is it intended to limit the scope of the technical solution for which protection is sought. Some embodiments of the present disclosure propose a multi-piece parison extrusion port core mold structure and a two-piece tank parison generation method, which can modify the existing parison extrusion port core mold structure to achieve the production of a two-piece parison. The modification cost is low and the versatility is high.

[0006] In the first aspect, some embodiments of the present disclosure provide a multi-piece parison extrusion core mold structure, comprising: a mouth mold, a core mold, a guide cone sleeve and a diverter plate; the interior of the mouth mold is a hollow structure, the core mold is arranged inside the mouth mold, the narrow end of the guide cone sleeve is embedded in the upper end of the mouth mold, and the narrow end of the guide cone sleeve wraps the upper end of the core mold, wherein the annular gap between the mouth mold, the core mold and the guide cone sleeve constitutes the parison extrusion flow channel; at least two notches are opened on the side wall of the mouth mold, and the notches extend along the height direction of the mouth mold, the diverter plate is embedded in the parison extrusion flow channel through the notches, and abuts against the core mold to divide the tubular parison extrusion flow channel into a plurality of independent arc-shaped parison extrusion flow channels, wherein a conical blade is formed on the upper end of the diverter plate.

[0007] In some embodiments, the outer surface of the die is cylindrical, and a boss structure is formed at the upper end of the die; the slot starts from a position a certain distance from the upper end of the die and extends to the lower end of the die, wherein the length of the diverter plate is not less than the length of the slot; the outer surface of the core mold is a cylindrical core body, and a cone extending outward is formed at the lower end of the cylindrical core body, and the cone body is also provided with an avoidance groove at the position corresponding to the slot, wherein the bottom of the avoidance groove is located on the extension line of the outer surface of the cylindrical core body.

[0008] In some embodiments, the length of the diverter plate is greater than the length of the slot; and a tapered edge is formed on the side end of the diverter plate facing the core mold.

[0009] In some embodiments, the multi-piece parison extrusion core mold structure also includes a fixed block for fixing the diverter plate on the die; a fixed groove for accommodating the diverter plate is provided on the fixed block, and a high-temperature resistant gasket is also provided in the fixed groove to make the diverter plate close to the core mold, wherein the high-temperature resistant gasket includes at least one of the following: a heat-sensitive plastic gasket, a spring.

[0010] In some embodiments, two notches are opened on the side wall of the die, and the two notches are symmetrically arranged relative to the central axis of the die.

[0011] In a second aspect, some embodiments of the present disclosure provide a method for generating a two-piece fuel tank blank, adopting the multi-piece blank extrusion outlet core mold structure described in any one of the implementation methods in the first aspect above, including: according to the wall thickness of the fuel tank blank, controlling the core mold to move up and down in the guide cone sleeve by a wall thickness control cylinder to change the gap between the core mold and the outlet die; allowing the molten blank to flow downward from the upper end of the outlet die along the blank extrusion channel, and during the flow, the tubular blank is divided into two arc-shaped blanks by a diverter plate and continues to flow downward; during the flow of the two blanks in the blank extrusion channel, they are always separated by the diverter plate until they flow out from the lower end of the outlet die.

[0012] In some embodiments, the method further includes: when the length of two pieces of the parison flowing out from the multi-piece parison extrusion core mold structure reaches a set length, controlling the parison grasping device to move to the lower end of the die, and controlling two manipulators on the parison grasping device to respectively embrace and grasp the upper ends of the two pieces of the parison; controlling the cutting device to cut the two pieces of the parison flowing out from the position between the lower end of the die and the parison grasping device; when the cutting is completed, controlling the two manipulators of the parison grasping device to open to unfold the two pieces of the parison.

[0013] The above-mentioned various embodiments of the present disclosure have the following beneficial effects: the multi-piece parison extrusion port core mold structure of some embodiments of the present disclosure can be simply improved on the existing parison extrusion port core mold structure, so as to realize the production of two-piece parisons. Specifically, at least two notches are opened on the side wall of the original die. The notches extend along the height direction of the die. At the same time, a diverter plate is added. The diverter plate is embedded in the parison extrusion flow channel through the above-mentioned notches and abuts against the core mold. Among them, a conical blade is formed on the upper end of the diverter plate. In this way, under the action of the diverter plate, the cylindrical parison extrusion flow channel surrounded by the die and the core mold can be divided into multiple independent arc-shaped parison extrusion flow channels. In other words, when the cylindrical parison passes through the diverter plate, it will be divided into multiple pieces of parisons by the diverter plate.

[0014] From the above description, it can be known that the multi-piece parison extrusion die core mold structure disclosed in the present invention often only needs to open a notch on the original die and install a diverter plate in the notch to complete the transformation of the original die core mold structure and realize the production of a two-piece fuel tank parison. The die core mold structure disclosed in the present invention has a simple structure and can reduce the complexity and cycle of the transformation, thereby reducing the impact on production. In addition, there is no need to replace the original die core mold structure, and there is no need to transform other equipment that cooperates with it for production, so that existing resources can be fully utilized, resource waste can be reduced, and the transformation cost can be greatly reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The above and other features, advantages and aspects of the embodiments of the present disclosure will become more apparent with reference to the following detailed description in conjunction with the accompanying drawings. Throughout the accompanying 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.

[0016] Figure 1 Schematic diagrams of some embodiments of the multi-piece parison extrusion port core mold structure disclosed in the present invention;

[0017] Figure 2 yes Figure 1 The schematic diagram of the split structure of the multi-piece parison extrusion port core mold shown;

[0018] Figure 3 yes Figure 1 A schematic cross-sectional view of a multi-piece parison extrusion port core mold structure shown;

[0019] Figure 4 It is a schematic diagram of the parison unfolding process;

[0020] Figure 5 is a flow chart of some embodiments of the method for generating a two-piece fuel tank parison disclosed in the present invention. DETAILED DESCRIPTION

[0021] 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 set forth 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 only for exemplary purposes and are not intended to limit the scope of protection of the present disclosure.

[0022] It should also be noted that, for ease of description, only the parts related to the invention 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.

[0023] It should be noted that the concepts such as "first" and "second" mentioned in the present 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.

[0024] It should be noted that the modifications of "one" and "plurality" 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, it should be understood as "one or more".

[0025] The present disclosure will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0026] See also Figures 1 to 3 , showing a schematic structural diagram of some embodiments of the multi-piece parison extrusion port core mold structure of the present invention. Here, the multi-piece parison extrusion port core mold structure may include a guide cone sleeve 1, a die 2, a core mold 4, and a diverter plate 5. Among them, the interior of the die 2 is a hollow structure. When producing the tank parison, the core mold 4 can be arranged inside the die 2. And the narrow end of the guide cone sleeve 1 is embedded in the upper end of the die 2, and the narrow end of the guide cone sleeve 1 wraps the upper end of the core mold 4. That is, the upper end of the core mold 4 is located in the guide cone sleeve 1. The upper end here is usually the end away from the ground when the structure is used. The upper end and the lower end are opposite ends.

[0027] from Figure 3It can be seen that the annular gap between the die 2, the core die 4 and the guide cone sleeve 1 can form a parison extrusion flow channel. At the same time, at least two notches 7 are provided on the side wall of the die 2. The notch 7 can extend along the height direction of the die 2. It can be understood that the number of notches 7 can be set according to actual needs. For example, if a two-piece parison is required to be produced, two notches can be provided on the side wall of the die 2, and the two notches are symmetrically arranged relative to the central axis of the die. The diverter plate 5 can be embedded in the parison extrusion flow channel through the notch 7 and abut against the core die 4. In this way, the tubular parison extrusion flow channel can be divided into a plurality of independent arc-shaped parison extrusion flow channels. Here, the upper end of the diverter plate 5 can form a conical blade. As an example, the upper end of the diverter plate can be conical and the lower end can be square.

[0028] It should be noted that the specific shape structures of the various components in the above-mentioned core mold structure, such as the die, core mold, and guide cone sleeve, can be the structures of the various components in the existing core mold structure for extruding a cylindrical parison. For example, the outer surface of the die 2 can be columnar, and a boss structure is formed at the upper end of the die 2. For another example, the outer surface of the core mold 4 can also be a columnar core body, and the lower end of the columnar core body is formed with a cone extending outward. In other words, the upper part of the core mold 4 can adopt an equal width structure, and the lower part can be a cone. In this way, by adjusting the gap between the cone at the lower end of the core mold 4 and the die 2, the wall thickness of the parison can be adjusted.

[0029] It can be known from the above description that the multi-piece parison extrusion port core mold structure of some embodiments of the present disclosure can be simply improved on the existing parison extrusion port core mold structure, so as to realize the production of two-piece parisons. Specifically, at least two notches are opened on the side wall of the original die. The notches extend along the height direction of the die. At the same time, a diverter plate is added. The diverter plate is embedded in the parison extrusion flow channel through the above-mentioned notches and abuts against the core mold. Among them, a conical blade is formed on the upper end of the diverter plate. In this way, under the action of the diverter plate, the cylindrical parison extrusion flow channel surrounded by the die and the core mold can be divided into multiple independent arc-shaped parison extrusion flow channels. In other words, when the cylindrical parison passes through the diverter plate, it will be divided into multiple pieces of parisons by the diverter plate.

[0030] The multi-piece parison extrusion die core mold structure disclosed in the present invention often only needs to open a notch on the original die and install a diverter plate in the notch to complete the transformation of the original die core mold structure and realize the production of a two-piece fuel tank parison. The die core mold structure disclosed in the present invention has a simple structure and can reduce the complexity and cycle of the transformation, thereby reducing the impact on production. In addition, there is no need to replace the original die core mold structure, and there is no need to transform other equipment that cooperates with it for production, so that existing resources can be fully utilized, resource waste can be reduced, and the transformation cost can be greatly reduced.

[0031] In some application scenarios, in order to ensure effective segmentation of the parison, the diverter plate 5 may be formed with a tapered edge at the side end facing the core mold 4 .

[0032] It is understandable that after the parisons divided by the diverter plate flow to the lower end of the diverter plate, the adjacent parisons may adhere again at the dividing point under the influence of high temperature. To solve this problem, as an example, the thickness of the diverter plate can be increased to increase the spacing between adjacent parisons. For example, the diverter plate can be a triangular structure. That is, the width of the diverter plate gradually increases from the upper end to the lower end. Optionally, the length of the diverter plate can also be increased to keep adjacent parisons in a separated state.

[0033] Specifically, Figure 2 As shown in Figure 3, the notch 7 starts from a position at a certain distance from the upper end of the die 2 and can extend to the lower end of the die 2. The length of the diverter plate 5 can be no less than the length of the notch 7. For example, the length of the diverter plate 5 can be the same as the length of the notch 7. It should be noted that, when the lower end of the core mold 4 is a cone, in order to avoid interference with the diverter plate 5, thereby affecting the adjustment of the gap between the die 2, the cone at the lower end of the core mold 4 can also be provided with an avoidance groove at the position corresponding to the notch 7. In addition, in order to ensure that the diverter plate 5 can fit tightly with the core mold 4 and realize the complete segmentation of the parison, the bottom of the avoidance groove is usually located on the extension line of the outer surface of the columnar core body. That is, the distance between the bottoms of the avoidance grooves is adapted to the outer surface size of the columnar core body. In this way, it can be ensured that the diverter plate 5 is always in close contact with the core mold 4, thereby avoiding the leakage of molten material.

[0034] Since the diverter plate 5 extends to the lower end of the die 2, the split parison is always separated by the diverter plate in the parison extrusion flow channel until it flows out of the parison extrusion flow channel (i.e., the lower end of the die). In this way, the parison located in the structure will not fuse and adhere again at the split point even under the action of high temperature. In addition, after the split parison flows out of the parison extrusion flow channel, it often leaves the high temperature environment in the structure and is in the natural environment. Since the temperature of the natural environment is much lower than the temperature in the structure, the split parison will usually cool and shape faster after flowing out of the parison extrusion flow channel, so the situation of fusion and adhesion is often less likely to occur again. Therefore, by adopting the multi-piece parison extrusion core mold structure disclosed in the present invention, there is no need to set up additional splitting equipment to split the parison extruded from the structure again. This can also help to improve production efficiency.

[0035] Furthermore, in order to further reduce the probability of adhesion of the parison after segmentation, as Figure 1 and 3As shown, the length of the diverter plate 5 can be greater than the length of the slot 7. In other words, the diverter plate 5 can protrude from the lower end of the outlet mold 2. In this way, after the split parison flows out of the parison extrusion channel, it can still maintain a separated state under the action of the diverter 5. It can be understood that the temperature of the parison that has just flowed out of the parison extrusion channel is often higher than the temperature of the parison that has flowed out before. Therefore, the closer the position is to the outlet of the parison extrusion channel, the higher the probability of the parison sticking. The embodiment of the present disclosure can effectively avoid the adhesion of the parison that has just flowed out by lengthening the length of the diverter plate so that it extends to the outside of the parison extrusion channel. In addition, the production effect of the mouth core mold structure disclosed in the present disclosure can be guaranteed, and the production efficiency of multi-piece fuel tank parisons can be greatly improved.

[0036] In some embodiments, the splitter plate can be fixed in a variety of ways. As an example, a clamp can be provided on the side wall of the die near both ends of the notch. The clamp can be fixed to the die by a pin and can rotate in a direction close to or away from the notch.

[0037] Optionally, the core mold structure of the present disclosure may further include a fixing block. Figures 1 to 3 As shown, the fixed block 3 can be used to fix the diverter plate 5 on the die 2. Here, a fixing groove for accommodating the diverter plate 5 can be provided on the fixed block 3. A fixing hole can also be provided on the fixed block. After the diverter plate is placed in the fixing groove, the fixing block is fixed to the die through the fixing hole and the bolt. It should be noted that, since the above-mentioned components are usually made of metal and there are certain processing errors, in order to ensure that the diverter plate 5 fits tightly with the core mold 4, a high-temperature resistant gasket 6 can also be provided in the above-mentioned fixing groove. The high-temperature resistant gasket 6 here can include but is not limited to at least one of the following: a thermosensitive plastic gasket, a spring, etc. Among them, thermosensitive plastics usually expand when heated to a certain temperature, such as polypropylene (PP), polytetrafluoroethylene, polyvinyl chloride (PVC), etc. In this way, when the thermosensitive plastic gasket expands due to heat, the diverter plate can be made to fit closely to the core mold. In addition, in order to prevent the molten material from leaking from the notch, the above-mentioned thermosensitive plastic gasket can also be provided between the fixed block and the die. It is understandable that the manifold can be fixed on the die by the fixing block, thereby ensuring that the manifold does not fall out when the core mold moves up and down.

[0038] It should be noted that the multi-piece parison extrusion core mold structure disclosed in the present invention has a simple structure, is easy to process, has a low manufacturing cost, can achieve complete separation when the parison is extruded, and does not require other cutting and separation devices. It also has good versatility, and the installation dimensions can be completely consistent with the traditional core mold. In addition, the parison wall thickness can be adjusted by the original equipment wall thickness control system, and no other modifications to the equipment are required.

[0039] It should be noted that in the process of producing fuel tank preforms using the multi-piece preform extrusion port core mold structure disclosed above, the following technical problems will also exist. When the molten preform flows in the preform extrusion flow channel, it encounters a diverter plate and is divided. Under the action of friction resistance, the two ends and the middle of the same preform after division will have uneven flow. That is, the flow rate of the molten material in contact with and close to the diverter plate will be slower than the flow rate of the molten material in the middle area. This will cause the lower end of the preform after division to not be on the same horizontal end surface, but to bulge downward a little in the middle and concave upward a little at both ends. Since the lower end of the preform coming out of the preform extrusion flow channel is not flat, this will affect the measurement and determination of the length of the preform. For this case, it is usually necessary to reserve a section longer than the length of the preform, or to perform secondary cutting on the end surface to ensure that the end surface is a flat end surface. This will cause a waste of material. In addition, secondary cutting will increase the production process and production time, affecting production efficiency. In addition, the uneven flow may also cause different material density or force at different locations of the parison on the same horizontal plane, resulting in the parison breaking during subsequent blowing production.

[0040] To solve this problem, the following technical solution can be adopted. A heating component can be arranged in the manifold, and a threading hole can be opened on the fixed plate, through which the power supply and signal transmission of the heating component can be realized. In this way, the molten material passing through the manifold can be further heated by the heating component, thereby increasing the flow speed of the molten material at the dividing point, and then making the flow speed of the molten material close to the manifold tend to the flow speed of the molten material in the middle area of ​​the parison.

[0041] Furthermore, a plurality of heating components may be provided in the length direction of the diverter plate. Among them, the temperature of the heating component located at the upper end of the diverter plate is higher than the temperature of the heating component located at the lower end of the diverter plate. In this way, when the tubular parison is just divided into a plurality of independent parisons by the diverter plate, the high temperature at the upper end of the diverter plate can be used to weaken or offset the resistance of the diverter plate, so that the flow rate at both ends of the same parison is close to the middle flow rate, or is synchronized with the middle flow rate. In addition, as the parison flows downward, the heat will also be transferred downward, thereby superimposing with the temperature of the subsequent diverter plate. Therefore, a relatively low temperature can be set at the lower end of the diverter plate, so as to avoid the situation where the flow rate at both ends is greater than the middle flow rate due to the high temperature. In addition, if a higher temperature is set at the lower end of the diverter plate, the probability of the dividing surface being adhered again after the adjacent parisons after the division flow out of the parison extrusion channel will also increase.

[0042] Continue to refer Figure 5 , which shows a flowchart of some embodiments of the method for generating a two-piece fuel tank parison disclosed in the present invention. The method can adopt the multi-piece parison extrusion port core mold structure described in any implementation of the above embodiments, and includes the following steps:

[0043] Firstly, according to the wall thickness of the oil tank blank, the core mold is controlled to move up and down in the guide cone sleeve by the wall thickness control cylinder to change the gap between the core mold and the die.

[0044] Next, the molten parison flows downward from the upper end of the die along the parison extrusion flow path.

[0045] Continuing, during the flow process, the cylindrical parison is divided into two arc-shaped parisons by the splitter plate and continues to flow downward.

[0046] Afterwards, the two pieces of the parison are always separated by the diverter plate while flowing in the parison extrusion flow channel until they flow out from the lower end of the die.

[0047] It is understandable that the execution subject of the method disclosed herein may be a device controller. When a two-piece fuel tank parison is extruded by using the multi-piece parison extrusion port core mold structure, the following steps may be continued.

[0048] First, when the length of the two pieces of parisons flowing out of the multi-piece parison extrusion port core mold structure reaches the set length, Figure 4 As shown, the parison grabbing device can be controlled to move to the lower end of the die, and the two manipulators on the parison grabbing device can be controlled to respectively embrace and grab the upper ends of the two parisons.

[0049] Next, the cutting device is controlled to cut the two outflowing parisons at a position between the lower end of the die and the parison grabbing device.

[0050] Afterwards, when the cutting is completed, the two manipulators of the parison gripping device can be controlled to open to unfold (ie, flatten) the two parisons.

[0051] It should be noted that in the process of production using the two-piece fuel tank parison generation method disclosed in the present invention, the following technical problems will also exist. The flow rate of the molten parison is usually closely related to the temperature. In most areas, especially in the north, the temperature changes greatly throughout the year. This will directly affect the ambient temperature of ordinary production workshops. This will have a certain impact on the flow rate of the parison. Therefore, it is necessary to dynamically adjust the heating temperature of the heating component in the diverter plate according to the actual flow rate of the parison, so as to ensure the consistency of the flow rate at both ends and in the middle of the parison as much as possible, so that the lower end of the parison tends to the same horizontal plane.

[0052] In addition, in order to prevent the leakage of molten material, the structure disclosed in the present invention generally adopts a closed structure inside the parison extrusion flow channel except for the upper and lower ends of the die (i.e., the inlet and outlet of the parison extrusion flow channel). In this way, it is impossible to use a flow rate detector to perform contact detection on the parison flow rate in the flow channel. In addition, contact detection will affect the flatness of the outer surface of the parison.

[0053] To solve this problem, the following solution can be adopted.

[0054] First, the original thermal image of the parison can be obtained from the outside of the structure of the present disclosure by thermal imaging technology. For example, for a two-piece fuel tank parison, the original thermal image can be obtained from a direction perpendicular to the dividing surface formed by the two diverter plates, that is, from the front of the structure. In this way, a complete thermal image of the independent parison can be obtained, that is, image data including the two ends and the middle area of ​​the parison.

[0055] Next, according to the differences in thermal imaging of different materials and the shape and size of each component in the structure, the original thermal image is feature extracted to obtain the initial thermal image of the preform. The initial thermal image here is usually a thermal image that characterizes an independent preform. It can be understood that since the original thermal image is obtained from the outside of the structure, the original thermal image will not only include the thermal imaging data of the preform, but also the thermal imaging data of components such as the mouth mold, core mold, and manifold. These components are usually made of metal materials. The preform is usually made of rubber. Different materials have different thermal conductivity, heat capacity, and thermal radiation characteristics, resulting in different temperature distributions under the same heat source, thereby showing different colors and brightness on the thermal image. In this way, the pixel points located within the shape contour of the preform and matching the thermal imaging of the preform material can be extracted from the original thermal image to obtain the initial thermal image of the preform.

[0056] Optionally, before feature extraction, the original thermal image may be linearly transformed to achieve grayscale inversion of the image so as to highlight the parison in the image, which helps to improve the accuracy of subsequent feature extraction.

[0057] Afterwards, the initial thermal image of the preform may be enhanced to obtain an enhanced thermal image of the preform. Nonlinear transformations, such as logarithmic transformations or exponential transformations, may be used to expand overly bright or overly dark images in the image.

[0058] Next, the enhanced thermal imaging image of the parison may be captured from the thermal imaging images of the two end regions and the middle region.

[0059] Furthermore, according to the acquisition time sequence of the thermal imaging images, three types of regional thermal imaging image sequences, namely, the thermal imaging image sequences of the two end regions (left end and right end) and the thermal imaging image sequence of the middle region of the parison, can be obtained respectively.

[0060] Continuing, based on the thermal imaging sequence of the left end area, the thermal imaging sequence of the right end area and the thermal imaging sequence of the middle area, the position changes of the left end, right end and middle areas of the parison can be confirmed, thereby determining the parison flow rates of these three areas.

[0061] Afterwards, according to the parison flow rate in the three areas, especially the difference in the parison flow rate between the left end and the middle, and the difference in the parison flow rate between the right end and the middle, the heating temperature of the heating component in the diverter plate can be dynamically adjusted. Among them, the heating components in the two diverter plates can be controlled separately. In this way, the heating temperature of the heating component can be dynamically adjusted according to the real-time flow rate of the parison, thereby effectively reducing the flow rate difference between the two ends and the middle area of ​​the parison. Thereby avoiding or reducing the effect of the heating of the heating component on the parison flow rate due to changes in ambient temperature. Compared with adjusting after extruding the parison, the method disclosed in the present invention can ensure the timeliness of flow rate control through real-time detection and dynamic adjustment, thereby effectively reducing resource waste. And this detection method can avoid affecting the outer surface of the parison.

[0062] The above descriptions are only some preferred embodiments of the present disclosure and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the invention involved in the embodiments of the present disclosure is not limited to the technical solutions formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the above inventive concept. For example, the above features are replaced with (but not limited to) technical features with similar functions disclosed in the embodiments of the present disclosure.

Claims

1. A multi-piece parison extrusion port core mold structure, characterized in that: include: Mouth die, core die, guide cone sleeve and manifold; The interior of the die is a hollow structure, the core die is arranged inside the die, the narrow end of the guide cone sleeve is embedded in the upper end of the die, and the narrow end of the guide cone sleeve wraps the upper end of the core die, wherein the annular gap between the die, the core die and the guide cone sleeve constitutes a parison extrusion flow channel; At least two notches are provided on the side wall of the die, and the notches extend along the height direction of the die. The diverter plate is embedded in the parison extrusion flow channel through the notches and abuts against the core die to divide the cylindrical parison extrusion flow channel into a plurality of independent arc-shaped parison extrusion flow channels, wherein the upper end of the diverter plate forms a conical blade; Wherein, the outer surface of the die is columnar, and a boss structure is formed at the upper end of the die; The notch starts from a position a certain distance from the upper end of the die and extends to the lower end of the die, wherein the length of the diverter plate is greater than the length of the notch, and the diverter plate is formed with a tapered blade at the side end facing the core die; The outer surface of the core mold is a cylindrical core body, and the lower end of the cylindrical core body is formed with a cone extending outward, and the cone body is also provided with an avoidance groove at a position corresponding to the notch, wherein the bottom of the avoidance groove is located on the extension line of the outer surface of the cylindrical core body.

2. The multi-piece parison extrusion port core mold structure according to claim 1, characterized in that: The multi-piece parison extrusion die structure further includes a fixing block for fixing the diverter plate on the die; The fixing block is provided with a fixing groove for accommodating the diverter plate, and a high temperature resistant gasket is also arranged in the fixing groove to make the diverter plate close to the core mold, wherein the high temperature resistant gasket includes at least one of the following: a heat-sensitive plastic gasket and a spring.

3. The multi-piece parison extrusion port core mold structure according to any one of claims 1 to 2, characterized in that: Two notches are provided on the side wall of the die, and the two notches are symmetrically arranged relative to the central axis of the die.

4. A method for producing a two-piece fuel tank parison, using the multi-piece parison extrusion port core mold structure as described in any one of claims 1 to 3, characterized in that: include: According to the wall thickness of the oil tank parison, the core mold is controlled to move up and down in the guide cone sleeve by a wall thickness control cylinder to change the gap between the core mold and the die; The molten parison flows downward from the upper end of the die along the parison extrusion flow channel, and during the flow, the cylindrical parison is divided into two arc-shaped parisons by the splitter plate and continues to flow downward; The two pieces of parison are always separated by the diverter plate during the process of flowing in the parison extrusion flow channel until they flow out from the lower end of the die.

5. The method for producing a two-piece fuel tank blank according to claim 4, characterized in that: The method further comprises: When the length of two pieces of parisons flowing out of the multi-piece parison extrusion port core mold structure reaches a set length, the parison grabbing device is controlled to move to the lower end of the port mold, and the two manipulators on the parison grabbing device are controlled to respectively embrace and grab the upper ends of the two pieces of parisons; Controlling the cutting device to cut the two outflowing parisons from the position between the lower end of the die and the parison grabbing device; When the cutting is completed, the two manipulators of the parison gripping device are controlled to open to unfold the two parisons.

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