Elliptic cylinder-free driving cylinder of hot runner system

Abstract

The utility model discloses a hot runner system elliptic cylinder-free driving cylinder which comprises a mold, a cavity is formed in the mold and serves as a cylinder structure, the cavity is a T-shaped stepped hole, a cylinder cover is installed on the upper portion of the first layer of stepped hole of the cavity, and a fixing screw is arranged between the cylinder cover and the mold; and an upstream runner and a downstream runner are arranged on the side surface of the second-layer stepped hole of the cavity, and are connected with an external driving source. According to the elliptic cylinder-free driving cylinder of the hot runner system, the elliptic section design is adopted, the space utilization rate is optimized through the section design of the elliptic driving cylinder, the elliptic cylinder-free driving cylinder is suitable for a compact mold, the driving cylinder is provided with a high-precision sensor and a control system, and the accuracy and synchronism of valve needle movement are ensured; according to the hot runner driving cylinder system, flexible and efficient motion control is achieved through the oval driving cylinder design, the multi-piston linkage structure and the compact design.

Description

Technical Field

[0001] This invention relates to the field of hot runner system technology, and more specifically to an elliptical cylinderless drive cylinder for a hot runner system. Background Technology

[0002] Hot runner systems are heating systems used in injection molds to inject molten plastic particles into the mold cavity. Hot runner molds are a novel construction that heats the runners and sprues of traditional or three-plate molds, eliminating the need to remove them after each molding cycle. Hot runners maintain the plastic in the runners and gates in a molten state through heating. Because heating rods and coils are located near or in the center of the runner, the entire runner from the injection molding machine nozzle to the gate is kept at a high temperature, keeping the plastic molten. After shutdown, it is generally not necessary to open the runner to remove the solidified material; upon restarting, only the runner needs to be heated to the required temperature. Therefore, hot runner technology is sometimes called a hot manifold system or runnerless molding. During injection molding, the hot runner system controls the flow of molten plastic through valve needles.

[0003] Traditional hot runner driven cylinder systems typically use circular cylinders with a single motion mode, making it difficult to precisely control the movement of multiple valve needles simultaneously. Therefore, a new technical solution is needed to address this issue. Summary of the Invention

[0004] The purpose of this invention is to provide an elliptical cylinderless drive cylinder for a hot runner system, which solves the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: an elliptical cylinderless drive cylinder for a hot runner system, comprising: a mold, wherein the mold has a cavity inside which serves as the cylinder structure, the cavity having a T-shaped stepped hole, a cylinder head being installed on the upper part of the first stepped hole of the cavity and a fixing screw being provided between the cylinder head and the mold, an upward flow channel and a downward flow channel being provided on the side of the second stepped hole of the cavity, the upward flow channel and the downward flow channel being connected to an external drive source, a piston body being installed inside the cavity, the upward flow channel and the downward flow channel being respectively located at the lower and upper parts of the piston body, the lower part of the piston body being interlocked with the third stepped hole of the cavity, and a piston cavity being provided inside the piston body and a valve needle being correspondingly installed in the piston cavity.

[0006] In a preferred embodiment of the present invention, both the cylinder head and the piston body are elliptical structures.

[0007] In a preferred embodiment of the present invention, a sealing ring is provided between the cylinder head and the first stepped hole of the chamber.

[0008] In a preferred embodiment of the present invention, a first sealing element is provided between the side of the piston body and the second stepped hole of the chamber.

[0009] In a preferred embodiment of the present invention, a second seal is provided between the lower part of the piston body and the third stepped hole of the chamber.

[0010] In a preferred embodiment of the present invention, a sensor module is installed inside the cylinder head, the sensor module including a temperature sensor, a pressure sensor and a distance sensor.

[0011] In a preferred embodiment of the present invention, the drive cylinder structure formed by the mold opening is made of a high-temperature resistant and wear-resistant material, and the surface is nitrided to improve wear resistance and corrosion resistance.

[0012] In a preferred embodiment of the present invention, the piston chamber in the piston body can be provided with a single, single-row or multiple rows of valve needles, and the same number of valve needles are provided inside. When using a piston body composed of a single, single-row or multiple rows of piston chambers, the cavity of the mold also needs to be adjusted accordingly.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0014] The hot runner system of this invention features an elliptical cylinder without a cylinder block, employing an elliptical cross-section design. This elliptical cross-section optimizes space utilization and is suitable for compact molds. The cylinder is equipped with a high-precision sensor and control system to ensure the accuracy and synchronization of valve needle movement. The cylinder is made of high-temperature resistant and wear-resistant materials, with a surface coating or plating treatment to improve wear resistance and corrosion resistance. Through its elliptical cylinder design, multi-piston linkage structure, and compact design, the hot runner system achieves flexible and efficient motion control. This elliptical hot runner system is suitable for high-precision and high-efficiency injection molding processes, significantly improving production efficiency and product quality. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the downward movement of a single-row piston in a drive cylinder according to the present invention;

[0016] Figure 2 This is a schematic diagram of the upward movement of a single-row piston in the drive cylinder according to the present invention;

[0017] Figure 3 This is a schematic diagram of the installation structure of a single piston in a drive cylinder according to the present invention;

[0018] Figure 4 This is a schematic diagram of a single piston structure of the present invention;

[0019] Figure 5This is a schematic diagram of the single-row piston structure of the present invention;

[0020] Figure 6 This is a schematic diagram of the double-row piston structure of the present invention.

[0021] In the diagram: 1. Mold; 2. Chamber; 3. Cylinder head; 4. Fixing screw; 5. Sensor module; 6. Sealing ring; 7. Piston; 8. Piston chamber; 9. First seal; 10. Second seal; 11. Upward flow channel; 12. Downward flow channel. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] Please see Figure 1-6 The present invention provides a technical solution: an elliptical cylinderless drive cylinder for a hot runner system.

[0024] To address the aforementioned problems: traditional hot runner driven cylinder systems typically have a circular design for the driven cylinder, resulting in a single mode of motion and making it difficult to simultaneously and precisely control the movement of multiple valve needles.

[0025] The solution is as follows: An elliptical cylinderless drive cylinder for a hot runner system includes: a mold, the interior of which is provided with a chamber that serves as the cylinder structure; the chamber has a T-shaped stepped hole; a cylinder head is installed on the upper part of the first stepped hole of the chamber, and a fixing screw is provided between the cylinder head and the mold; an upward flow channel and a downward flow channel are provided on the side of the second stepped hole of the chamber, and the upward and downward flow channels are connected to an external drive source; a piston body is installed inside the chamber; the upward and downward flow channels are respectively located at the lower and upper parts of the piston body; the lower part of the piston body is interlocked with the third stepped hole of the chamber; a piston cavity is provided inside the piston body, and a valve needle is correspondingly installed in the piston cavity.

[0026] Further improvements, such as Figure 1 As shown: Both the cylinder head and the piston body are elliptical structures. The elliptical design optimizes space utilization, making the drive cylinder more suitable for compact molds and improving the overall design flexibility and injection efficiency of the mold.

[0027] Further improvements, such as Figure 1As shown: A sealing ring is provided between the cylinder head and the first step hole of the cavity. The sealing ring enhances the sealing between the cylinder head and the mold, prevents fluid leakage, and ensures the stability and reliability of the hot runner system.

[0028] Further improvements, such as Figure 1 As shown: A first seal is provided between the side of the piston body and the second stepped hole of the chamber. The first seal further enhances the seal between the piston and the chamber, prevents the leakage of internal fluid, and ensures the normal operation and high efficiency of the hot runner system.

[0029] Further improvements, such as Figure 1 As shown: A second seal is provided between the lower part of the piston body and the third stepped hole of the chamber. The second seal provides additional sealing protection between the piston and the bottom of the chamber, further preventing fluid leakage and improving the sealing performance and durability of the system.

[0030] Further improvements, such as Figure 1 As shown: A sensor module is installed inside the cylinder head. The sensor module includes a temperature sensor, a pressure sensor, and a distance sensor. The high-precision sensor module can monitor key parameters such as temperature, pressure, and piston position of the hot runner system in real time, providing accurate data support for the control system, ensuring the accuracy and synchronization of valve needle movement, and improving the stability of the injection molding process and product quality.

[0031] Further improvements include a drive cylinder structure formed by mold openings, made of high-temperature and wear-resistant materials, with a nitrided surface to enhance wear resistance and corrosion resistance.

[0032] Further improvements, such as Figure 4 , 5 As shown in Figure 6, the piston chamber in the piston body can be configured with a single, single-row, or multiple rows of piston chambers, and the same number of valve needles can be configured inside. When using a piston body composed of a single, single-row, or multiple rows of piston chambers, the cavity of the mold also needs to be adjusted accordingly. This flexible design allows the hot runner system to be customized according to different injection molding requirements, improving the system's adaptability and flexibility. At the same time, the multi-piston linkage structure can achieve more complex and precise motion control, meeting the requirements of high-precision injection molding processes.

[0033] Working Principle: The elliptical cylinderless drive cylinder of the hot runner system adopts an elliptical cross-section design. The cross-section design of the elliptical drive cylinder optimizes space utilization and is suitable for compact molds. The drive cylinder is equipped with a high-precision sensor and control system to ensure the accuracy and synchronization of valve needle movement. The drive cylinder is made of high-temperature resistant and wear-resistant materials, and the surface is treated with plating or coating to improve wear resistance and corrosion resistance. The hot runner drive cylinder system achieves flexible and efficient motion control through the elliptical drive cylinder design, multi-piston linkage structure and compact design. The elliptical drive cylinder hot runner system is suitable for high-precision and high-efficiency injection molding processes, and can significantly improve production efficiency and product quality.

[0034] The relevant data for this plan is as follows:

[0035] Data statistics table

[0036]

[0037] bar chart

[0038]

[0039] Data and charts demonstrate that the elliptical cylinderless drive cylinder outperforms the traditional circular drive cylinder in several key performance indicators. In terms of space utilization, the elliptical design reduces the mold installation space required, providing a better solution for compact molds. The valve needle movement accuracy is significantly improved, and positioning errors are greatly reduced, which is crucial for high-precision injection molding and directly reduces the defect rate of injection molded products. Regarding mold applicability flexibility, the elliptical drive cylinder can be adapted to more types of molds, enhancing the system's versatility. In terms of hot runner system stability, the elliptical drive cylinder increases the continuous stable operation time, reducing production interruptions caused by system failures and improving production efficiency, powerfully demonstrating its technological advantages.

[0040] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0041] Finally, the following points should be noted: First, in the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installation", "connection", and "linkage" should be interpreted broadly, and can refer to mechanical or electrical connections, or internal connections between two components, or direct connections. "Up", "down", "left", "right", etc., are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may change.

[0042] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A hot runner system oval cylinder-less drive cylinder characterized by: include: The mold (1) has a cavity (2) inside, which serves as a cylinder structure. The cavity (2) has a T-shaped stepped hole. A cylinder head (3) is installed on the upper part of the first stepped hole of the cavity (2), and a fixing screw (4) is provided between the cylinder head (3) and the mold (1). An upward flow channel (11) and a downward flow channel (12) are provided on the side of the second stepped hole of the cavity (2). The upward flow channel (11) and the downward flow channel (12) are connected to an external drive source. A piston body (7) is installed inside the cavity (2). The upward flow channel (11) and the downward flow channel (12) are respectively located at the lower and upper parts of the piston body (7). The lower part of the piston body (7) is fitted with the third stepped hole of the cavity (2). A piston cavity (8) is provided inside the piston body (7), and a valve needle is installed in the piston cavity (8).

2. The hot flow system elliptical cylinder-less drive cylinder of claim 1, wherein: Both the cylinder head (3) and the piston body (7) are elliptical structures.

3. The hot flow system elliptical cylinder-less drive cylinder of claim 1, wherein: A sealing ring (6) is provided between the cylinder head (3) and the first step hole of the chamber (2).

4. The hot- flow system elliptical cylinder-less drive cylinder of claim 1, wherein: A first seal (9) is provided between the side of the piston body (7) and the second step hole of the chamber (2).

5. The hot- flow system elliptical cylinder-less drive cylinder of claim 1, wherein: A second seal (10) is provided between the lower part of the piston body (7) and the third step hole of the chamber (2).

6. The hot- runner system oval-shaped cylinder-less drive cylinder of claim 1, wherein: The cylinder head (3) is equipped with a sensor module (5), which includes a temperature sensor, a pressure sensor and a distance sensor.

7. The hot- runner system oval-shaped cylinder-less drive cylinder of claim 1, wherein: The drive cylinder structure formed by the opening of the mold (1) is made of high temperature and wear resistant material, and the surface is nitrided to improve wear resistance and corrosion resistance.

8. The hot- runner system oval-shaped cylinder-less drive cylinder of claim 1, wherein: The piston chamber (8) in the piston body (7) can be set with a single, single row or multiple rows and the same number of valve needles are set inside. When using the piston body (7) composed of a single, single row or multiple rows of piston chambers (8), the chamber (2) of its mold (1) also needs to be adjusted accordingly.

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