Patent Application
20240359390
The present disclosure claims priority to Chinese patent application No. 202321000526.0, filed Apr. 25, 2023, all of which is herein incorporated by reference.
The present disclosure relates to the field of blow molding, and in particular to a valve device and a blow molding system.
In existing designs, relying on electrostatic adsorption of lighter decorative films (1-3 g) renders it unreliable or unfeasible to adsorb heavier decorative leather (26-31 g).
Chinese patent CN111660504A discloses an injection mold for transfer printing inside an automobile front panel mold, comprising stationary mold multi-plates and movable mold multi-plates. A gate, a spacer, a hot runner support, and a fixed mold plate are arranged on the stationary mold multi-plates. Mold feet, a top plate, and a movable mold plate are arranged on the movable mold multi-plates, with a mold cavity set between the movable mold plate and stationary mold plate. A positioning mechanism is arranged in the mold cavity on the stationary mold side, with lateral hot nozzles connected under the hot runner support. A small slider is arranged on the movable mold plate with a hidden gate, and during injection molding, a decorative film piece matching the mold cavity is placed on the positioning mechanism and integrally molded into the automobile front panel with the decorative film piece. A pintle connected to the top plate contacts the molded automobile front panel with the decorative film piece through the movable mold plate. Upon mold opening, the top plate is driven by ejection power to drive the pintle to lift the molded automobile front panel with the decorative film piece, while the sliding mechanism drives the small slider outward to break off the residual material in the hidden gate, allowing smooth demolding of the automobile front panel with the decorative film piece.
However, in the prior art, the positioning mechanism adopts a structure with grooves corresponding to perforations on the decorative film piece, which compromises the integrity of the decorative film piece and affects the appearance. Furthermore, due to the lightweight of the decorative film piece, when heavier and complete decorative leather is required in blow molds, the adsorption capacity between the decorative leather and the inner wall of the mold needs improvement.
Therefore, the existing technology still needs to be improved and developed.
In view of the above problems, embodiments of the present disclosure provide a valve device and a blow molding system, aiming to solve the problem in the prior art that the adsorption and release effect between the decorative leather and the inner wall of the blow mold needs to be improved.
Embodiments of the present disclosure provide the following technical solutions to solve the above technical problems.
A first aspect of the present disclosure provides a valve device. The valve device is applied to a blow mold, and a decorative leather for affixing to a bottle body is placed in the blow mold. The valve device includes a base and at least one pintle arranged on the base, wherein one pintle is inserted into a vacuum suction hole of the blow mold, wherein the base is able to abut against or away from an outer wall of the blow mold to facilitate an inner wall of the blow mold to release or adsorb the decorative leather.
In some embodiments of the valve device, a diameter of the pintle is in a range of 0.2 mm to 3 mm.
In some embodiments of the valve device, multiple pintles are arranged, and the multiple pintles are evenly arranged on a head end of the base.
In some embodiments of the valve device, five pintles are arranged, and the pintles are distributed at each end point of a cross shape.
In some embodiments, the valve device further includes a driver connected to the base and used to control a movement of the base.
In some embodiments, the valve device further includes a mounting member located on a side of the base away from the pintle, and a mounting hole is arranged on the mounting member, wherein one end of the driver is arranged in the mounting hole.
In some embodiments of the valve device, a plurality of embedding holes are arranged evenly on the head end of the base, and the pintles are arranged in one-to-one correspondence with the plurality of embedding holes.
In some embodiments of the valve device, a plurality of grooves distributed in an array are arranged on an edge of the base, and the plurality of grooves are adopted to guide a flow of air on an inner side and an outer side of the vacuum suction hole.
A second aspect of the present disclosure provides a blow molding system, which includes the valve device and the blow mold as described in any one of the above.
In some embodiments, the blow mold is provided with at least one vacuum suction hole, and the vacuum suction hole corresponds to the pintle.
In some embodiments, the blow molding system further includes a pump body located outside the blow mold. The pump body is adopted to extract air in the blow mold through the vacuum suction hole to facilitate the inner wall of the blow mold to adsorb the decorative leather.
Beneficial effects: The present disclosure provides a valve device and a blow molding system. The valve device is applied to a blow mold. The blow mold is internally provided with one or two decorative leathers for ultimately affixing to a bottle preform. The valve device comprises: a base; at least one pintle arranged on the base, with one pintle being inserted into a vacuum suction hole of the blow mold. The base is able to abut against an outer wall of the blow mold, so as to release or adsorb the decorative leather on an inner wall of the blow mold. The valve device of the present disclosure sets at least one pintle to be respectively inserted into the vacuum suction hole of the blow mold, and a synchronized movement of at least one pintle enables the pintle to move away from the blow mold to release the vacuum suction hole, thereby allowing air to be extracted from an inner side of the blow mold through the vacuum suction hole to an outer side of the blow mold, creating negative pressure and enabling heavier decorative leather to be adsorbed to the inner wall of the blow mold. The synchronized movement of at least one pintle can also move the pintle toward the blow mold, and when a head end of the base abuts against the outer wall of the blow mold, the base completely blocks vacuum suction holes, achieving detachment between the decorative leather and the inner wall of the blow mold, enhancing the adsorption and release effects between the decorative leather and the inner wall of the blow mold, facilitating the bonding of the decorative leather to the bottle body to complete the production of the product.
In addition to the technical problems solved by the present disclosure, the technical features constituting the technical solutions and the beneficial effects brought by the technical features of these technical solutions described above, other solved problems, technical features contained in the technical solutions and the beneficial effects brought by the technical features for the valve device and the blow molding system provided by the present disclosure are further described in detail in the embodiments.
In order to provide a clearer explanation of the embodiments of the present disclosure or the technical solutions in the prior art, a brief introduction to the drawings required for the description of the embodiments or the prior art in the following description is provided. It is evident that the drawings described below are some embodiments of the present disclosure. These drawings and accompanying descriptions are not intended to limit the scope of the present disclosure in any way, but rather to illustrate the concepts of the present disclosure to those skilled in the art by reference to embodiments. For those skilled in the art, additional drawings can be obtained based on these drawings without the exercise of creative labor.
Explanation of reference labels: 10-Valve device; 11-Base; 110-Groove; 111-Embedding hole; 12-Pintle; 13-Mounting member; 130-Mounting hole; 21-Blow mold; 22-Decorative leather; 23-Bottle body.
In order to make the purpose, technical solutions and effects of the present disclosure clearer, the technical solutions in the embodiments of the present disclosure are clearly and completely described below in conjunction with the drawings according to the embodiments of the present disclosure. Obviously, the described embodiments are only part of the embodiments of the present disclosure, but not all the embodiments. Based on the embodiments in the description, any other embodiments obtained by those skilled in the art without creative efforts fall within the scope of protection of the present disclosure.
The mold in the blow molding equipment is used in conjunction with the blow molding machine. The quality of blow molded products is closely related to the level of mold design and production. The main structure of blow molds for different plastic products is similar, consisting of two halves of the mold. The mold can be designed as a fixed mold plus a movable mold, or both molds can be movable. Structurally, it mainly consists of a cavity, a mold body, a cooling system, a cutting device, exhaust holes or grooves, and a guiding mechanism. For more complex blow molded products, the mold may also require special designs such as inserts, core pulls, segmented opening and closing molds, and negative pressure. The field covered by the present disclosure includes mold structure (partial vacuum extraction mechanism), negative pressure system (by means of suction hole structure, and associated system design), and achieving functions such as closing plugs and preventing molten material from being blown into the vacuum channel and causing blockages.
In existing designs electrostatic force is only used to adsorb lighter decorative films (1-3 g), and cannot be used to guarantee the reliability of the adsorption or complete the adsorption of heavier decorative leather (26-31 g).
Based on the above problems, embodiments of the present disclosure provide a valve device and a blow molding system. In an embodiment, the valve device can only be provided with one pintle with larger diameter, corresponding to a vacuum suction hole with larger diameter on the blow mold. Therefore, the one pintle is inserted into the vacuum suction hole with larger diameter, and by moving the one pintle, the adsorption or release of the decorative leather can be achieved, which facilitates the bonding between the decorative leather and the bottle body to complete the product.
Due to the need to adsorb heavier decorative leather, when considering the design of only one vacuum suction hole, the diameter of the vacuum suction hole needs to be enlarged. The corresponding valve only has one block member with larger diameter to block the vacuum suction hole, which would easily lead to vacuum failure, resulting in poor adsorption between the leather and the mold.
In an embodiment of the present disclosure, the valve device achieves better performance by setting multiple pintles to be inserted separately into the vacuum suction holes of the blow mold. When the driver of the valve device retracts, the multiple pintles move synchronously, allowing them to move away from the blow mold and open multiple vacuum suction holes. This allows air to be extracted from the inside of the blow mold through the multiple vacuum suction holes to the outside of the blow mold, creating negative pressure. As a result, both lighter and heavier decorative leathers can be adsorbed to the inner wall of the blow mold. The synchronous movement of the multiple pintles can also cause them to move toward the blow mold. When the head end of the base abuts against the outer wall of the blow mold, multiple vacuum suction holes are completely blocked, achieving detachment between the decorative leather and the inner wall of the blow mold. As the plastic bottle preform expands, the decorative leather adheres to the bottle body, completing the production of the product.
The technical solution of the present disclosure and how the technical solution of the present disclosure solves the above technical problems are described in detail below with embodiments. The following embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments. The valve device provided by the embodiments of the present disclosure are described in detail below with reference to
As shown in
As shown in
As shown in
In some embodiments, as shown in
The diameter of the pintle 12 adopted in the present embodiment is 1 mm as shown in
In some embodiments, the multiple pintles 12 are evenly distributed at the head end of the base 11.
The number of pintles 12 is set according to actual needs. For example, the number of pintles can be set to 3, 4, 6, or 8, but is not limited to these numbers. The corresponding vacuum suction holes has the number and same arrangement of the pintles, so that the pintles 12 are inserted into the corresponding vacuum suction holes, respectively; the functions of the evenly distribution of the pintles 12 include enabling the valve device 10 to be stably connected to the blow mold to extract air from the vacuum suction holes corresponding to the pintles and increasing the service life of the valve device.
In another embodiment, the pintle 12 adopts the arrangement of each pintle having a diameter of 1.5 mm, and four pintles being arranged in a rectangular array. Each of the front and rear molds of the blow mold are provided with one, but it is not limited to this.
In the present embodiment, as shown in
In the present embodiment, the four pintles located on the outside (at the four ends of the cross) are distributed in an array, and the one pintle located in the middle (cross point) is at the same distance from the other four pintles. Further, as shown in
In some embodiments, the valve device also includes a driver (not shown in the drawing) connected to the base 11, wherein the driver is used to control the movement of the base 11 (that is, to realize the extension and retraction of the base and the multiple pintles). It should be noted that the driver can control all the pintles 12 to move out from the vacuum suction hole, or control the pintle 12 to partially move out of the vacuum suction hole (in this state, air can be extracted from the gap between the vacuum suction hole and the pintle).
The driver in this embodiment is a cylinder, so that an end of the cylinder is connected to a tail end of the base, so that the movement of the base 11 drives the pintle 12 to move left and right (the left and right directions in
It is worth mentioning that before the decorative object (i.e., the decorative leather 22) reaches the mold, the pintle 12 of the valve device 10 is retracted, and the decorative object is adsorbed on the inner wall of the mold through the vacuum provided by the adsorption hole (i.e., the vacuum suction hole). Then, the mold is closed, and the pintle 12 in the valve moves forward to block the vacuum suction hole before blowing in high-pressure air, and the decorative leather 22 is released. High-pressure air is blown into the preform, and the decorative leather is released and adhered to the bottle body 23.
In some embodiments, as shown in
The mounting hole 130 on the mounting member 13 is connected to the bolt at the end of the cylinder. The mounting hole 130 adopts M4 screw threads with a hole depth of 6 mm. The mounting member 13 has end surface on both sides and a curved surface. The mounting member 13 and the base 11 can be integrally processed or separately installed, which are not limited here.
In the present embodiment, as shown in
A tail end of the pintle 12 is inserted into the embedding hole 111, and the size of the embedding hole 111 corresponds to the size of the pintle 12. As further shown in
In an embodiment, as shown in
When the air in the blow mold is extracted, the air passes through the vacuum suction hole and is discharged outward through the grooves 110, the guidance of the air flow is achieved and the adsorption effect and adsorption efficiency between the mold and the leather are improved.
It can be understood that the vacuum suction hole of the blow mold has two functions. One is to ensure that the leather and the mold cavity wall (i.e., the inner wall of the mold) are closely attached, and the other one is to block the leakage. At the same time, the hole size has a great impact on the appearance of the product, so the depth is designed moderate.
In the present disclosure, the following aspects are fully considered: First. The size and distribution of the holes, which ensure the holes remaining unobstructed during use. While using purified compressed air, preventing melted plastic raw materials from clogging the holes is also crucial. Second, providing a negative pressure mechanism to ensure that the part (leather) is adhered to the cavity wall in the cavity before blow molding, and maintain the set position relationship to complete the blow molding of qualified products. Third, once the leather falls off, the pressure in the cavity changes sharply. In order to avoid such problems, a negative pressure mechanism and the PLC control system are provided to close the plug and prevent leather from being blown into the vacuum channel and causing blockage.
Based on the embodiments, the present disclosure also provides a blow molding system, which includes the valve device and the blow mold as described in any one of above, as shown in
The blow mold 21 is provided with a plurality of vacuum suction holes, and the plurality of vacuum suction holes correspond to the pintles 12 one by one.
In an embodiment, the system further includes a pump body (not shown in the drawing) located outside the blow mold. The pump body is used to extract the air in the blow mold 21 through the vacuum suction holes, so that the decorative leather 22 is adsorbed on the inner wall of the blow mold 21.
The present disclosure can automatically turn off the vacuum pressure in the mold to prevent hot blow molding materials from clogging the vacuum channel and damaging the mold. The adsorption and release of the decorative leather 22 of the present disclosure is driven by changes in vacuum pressure in the system, thereby completing the adsorption and release of parts.
The present disclosure can automatically turn off the vacuum at the end to avoid placing one label in a cavity that requires two labels (i.e., decorative leathers) to make a qualified part. The present disclosure includes a vacuum sensing controller that provides the choice of one label or two labels.
In the description of the present disclosure, unless otherwise limited, the terms “installation”, “connection”, “connect”, “fixing” and other terms should be understood in a broad sense. For example, it can be a fixed connection or a detachable connection, or integration. It can be mechanical connection, electrical connection, or mutual communication connection. It can be directly connected, or indirectly connected through an intermediate medium. It can be the internal connection of two elements or the interaction of two elements. For those skilled in the art, the meanings of the above terms in the present disclosure can be understood according to the circumstances.
In the description of the present disclosure, it needs to be understood that the directions or positional relationships indicated by the terms “center”, “longitudinal”, “transverse”, “length”, “width”, “thickness”, “upper”, “lower”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, etc. are based on the directions or positions shown in the accompanying drawings. The positional relationship is only for the convenience of describing the present disclosure and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present disclosure.
In addition, the terms “first” and “second” are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of technical features. Therefore, features defined as “first” and “second” may explicitly or implicitly include one or more of these features. In the description of the present disclosure, “plurality” means at least two, such as two, three, etc., unless otherwise expressly and specifically limited.
Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present disclosure, but not to limit it. Although the present disclosure has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions described in the foregoing embodiments can still be modified, or some or all of the technical features can be equivalently substituted; and these modifications or substitutions do not deviate the essence of the corresponding technical solutions from the technical solutions of the embodiments of the present disclosure.
| Number | Date | Country | Kind |
|---|---|---|---|
| 2023210005260 | Apr 2023 | CN | national |
