Single-cylinder hot runner device for injection molding of decorative panel

Abstract

The utility model relates to a single-cylinder hot runner device for injection molding of a decorative panel. The single-cylinder hot runner device comprises a plastic feeding plate, a transmission cylinder body, an injection molding head, a valve needle, a plastic feeding cavity and a piston rod, the plastic feeding cavity is provided with a transmission channel, and the transmission channel is communicated with the plastic inlet through an interface; the plastic feeding cavity is connected with the piston rod; the injection molding head is provided with an injection molding cavity communicating with the conveying channel, the valve needle is coaxially arranged in the injection molding cavity, and one end of the valve needle is connected with the piston rod. The utility model has the advantages that through the reciprocating motion of the valve needle, the circulation of a melt during injection molding is facilitated, and the injection molding opening can be quickly blocked when the injection molding is stopped, so that the melt is immediately stopped in the injection molding cavity; the structure is simple, the production cost is low, and the integrated hot runner structure is achieved through reciprocating motion of the piston rod.

Description

Technical Field

[0001] The utility model relates to the technical field of injection molding auxiliary equipment, in particular to a single-cylinder hot runner device for injection molding of decorative panels. Background Art

[0002] Decorative panels used in home appliances are typically made of plastic and manufactured through injection thermoforming. After the plastic melt is injected into the panel molding mold, the desired decorative panel structure is formed. However, in existing production lines, after the plastic melt enters the mold through the injection port, a significant amount of plastic melt remains near the injection port when injection is stopped. This residual plastic melt leaks out of the injection port and, after cooling, may adhere to the outer wall of the injection port. Over time, this can easily lead to port blockage, affecting injection efficiency. Utility Model Content

[0003] The utility model aims to provide a single-cylinder hot runner device for decorative panel injection molding, which can quickly block the injection port after stopping injection molding to prevent melt leakage.

[0004] In order to achieve the above-mentioned purpose of the utility model, the utility model provides a single-cylinder hot runner device for decorative panel injection molding, including a plastic feed plate, a transmission cylinder, an injection head, a valve needle, a plastic feed cavity, and a piston rod;

[0005] The transmission cylinder is located between the plastic feed plate and the injection molding head, one end of the transmission cylinder is provided with a connecting groove, the plastic feed cavity is provided with an interface, and the interface is located in the connecting groove; the plastic feed cavity is provided with a transmission channel, the plastic feed plate is provided with a plastic feed port, and the transmission channel is connected to the plastic feed port through the interface;

[0006] The piston rod is located at the other end of the transmission cylinder, and the injection cavity is connected to the piston rod;

[0007] The injection head is provided with an injection cavity, which is communicated with the transmission channel. The valve needle is coaxially arranged in the injection cavity, and one end of the valve needle is connected to the piston rod.

[0008] As a further improvement of the utility model, the outer wall of the piston rod is provided with a protruding first limit piece, the transmission cylinder body is provided with a limit groove, the piston rod is located in the limit groove, the limit groove is provided with a second limit piece, and the first limit piece is located between the second limit piece and the inner wall of the limit groove.

[0009] As a further improvement of the utility model, the diameter of the injection port of the injection head is smaller than the diameter of the injection cavity.

[0010] Furthermore, a cone head is provided at the end of the valve needle close to the injection port.

[0011] The utility model discloses a single-cylinder hot runner device for decorative panel injection molding, and before injection molding, the piston rod is extended and retracted through existing transmission equipment such as a cylinder, etc., to control the molding cavity and the valve needle connected thereto to move toward the molding plate at the same time, the interface is docked with the molding port, and the valve needle is away from the injection port of the injection head, providing space for the transmission of the plastic melt; the plastic melt is transmitted from the molding port of the molding plate to the transmission channel of the molding cavity, then flows into the injection cavity, and finally enters the decorative panel injection molding mold from the injection port; when the injection molding is completed, the piston rod is reset, the molding cavity and the valve needle connected thereto are away from the molding plate at the same time, the valve needle is inserted into the injection port, and the transmission channel of the injection cavity of the injection head is closed.

[0012] Compared with the prior art, the utility model has the following advantages for the single-cylinder hot runner device for decorative panel injection molding:

[0013] (1) The reciprocating motion of the valve needle not only facilitates the flow of the melt during injection molding, but also quickly blocks the injection port when injection molding is stopped, immediately stopping the melt in the injection cavity;

[0014] (2) The structure is simple and the production cost is low. The integrated hot runner structure is realized through the reciprocating movement of the piston rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic structural diagram of a single-cylinder hot runner device for decorative panel injection molding according to the present invention;

[0016] Figure 2 This is a cross-sectional view of a single-cylinder hot runner device for decorative panel injection molding according to the present invention;

[0017] Figure 3 This is a partially enlarged cross-sectional view of a single-cylinder hot runner device for decorative panel injection molding according to the present invention;

[0018] Figure 4 This is a schematic diagram of the structure when the valve needle seals the injection port;

[0019] Figure 5 Schematic diagram of the valve needle and melt flow status during injection molding. DETAILED DESCRIPTION

[0020] The specific implementation of the present invention will be further described in detail below with reference to the accompanying drawings.

[0021] like Figure 1-2 As shown, the single-cylinder hot runner device for decorative panel injection molding of the present invention includes a plastic feed plate 1, a transmission cylinder 2, an injection head 3, a valve needle 4, a plastic feed cavity 5, and a piston rod 6;

[0022] The transmission cylinder 2 is located between the plastic feeding plate 1 and the injection head 3. Figure 3As shown, one end of the transmission cylinder 2 is provided with a connecting groove 23, the plastic feeding cavity 5 is provided with an interface 52, and the interface 52 is located in the connecting groove 23; the plastic feeding cavity 5 is provided with a transmission channel 51, and the plastic feeding plate 1 is provided with a plastic feeding port 11, and the transmission channel 51 is connected to the plastic feeding port 11 through the interface 52;

[0023] The piston rod 6 is located at the other end of the transmission cylinder 2, and the plastic cavity 5 is connected to the piston rod 6;

[0024] The injection head 3 is provided with an injection cavity 31 , which is communicated with the transmission channel 51 . The valve needle 4 is coaxially arranged in the injection cavity 31 , and one end of the valve needle 4 is connected to the piston rod 6 .

[0025] The utility model is a single-cylinder hot runner device for decorative panel injection molding. Before injection molding, the piston rod 6 is extended and retracted through existing transmission equipment such as a cylinder, etc., to control the connected molding cavity 5 and valve needle 4 to move toward the molding plate 1 at the same time, and the interface 52 is connected to the molding port 11. Figure 5 As shown, the valve needle 4 is away from the injection port 32 of the injection head 3, providing space for the transmission of the plastic melt; the plastic melt is transmitted from the injection port 11 of the molding plate 1 to the transmission channel 51 of the molding cavity 5, then flows into the injection cavity 31, and finally enters the decorative panel injection molding mold from the injection port 32; when the injection is completed, the piston rod 6 is reset, and the molding cavity 5 and the valve needle 4 connected thereto are simultaneously away from the molding plate 1, and the valve needle 4 is inserted into the injection port 32, closing the transmission channel of the injection cavity 31 of the injection head 3.

[0026] The outer wall of the piston rod 6 is provided with a first stopper 61. The transmission cylinder 2 is provided with a stopper groove 21. The piston rod 6 is positioned within the stopper groove 21. The stopper groove 21 is provided with a second stopper 22. The first stopper 61 is positioned between the second stopper 22 and the inner wall 211 of the stopper groove 21. The piston rod 6 constantly moves back and forth along the stopper groove 21. The second stopper 22 and the inner wall 211 of the stopper groove 21 block the second stopper 22 of the piston rod 6, limiting the movement of the piston rod 6.

[0027] The diameter of the injection port 32 is smaller than the diameter of the injection cavity 31. The plastic melt is transferred from the injection cavity 31 to the injection port 32. The diameter of the injection port 32 is smaller than the diameter of the injection cavity 31. The flow pressure of the plastic melt in the injection port 32 can be increased, so that the plastic melt can be quickly ejected from the injection port 32. At the same time, the large diameter of the injection cavity 31 can increase the flow rate of the plastic melt in the injection cavity 31. The small diameter of the injection port 32 makes it convenient for the valve needle 4 to quickly block the injection port 32 when the injection is stopped.

[0028] A cone head 41 is provided at the end of the valve needle 4 near the injection port 32. Since the diameter of the injection port 32 is relatively small, the cone head 41 allows the valve needle 4 to be quickly moved into the injection port 32, preventing the end of the valve needle 4 from becoming misaligned with the injection port 32 due to long-term movement of the valve needle 4, which could affect the valve needle 4's clogging.

[0029] The preferred embodiments of the present invention have been specifically described above, but the present invention is not limited to the described embodiments. Those skilled in the art may make various equivalent modifications or substitutions without violating the spirit of the present invention. These equivalent modifications or substitutions are all within the scope defined by the claims of this application.

Claims

1. Single cylinder hot runner device for decorative panel injection molding, characterized in that: It includes a plastic inlet plate, a transmission cylinder, an injection head, a valve needle, a plastic inlet cavity, and a piston rod; The transmission cylinder is located between the plastic feeding plate and the injection molding head, one end of the transmission cylinder is provided with a connecting groove, the plastic feeding cavity is provided with an interface, and the interface is located in the connecting groove; the plastic feeding cavity is provided with a transmission channel, the plastic feeding plate is provided with a plastic feeding port, and the transmission channel is connected with the plastic feeding port through the interface; The piston rod is located at the other end of the transmission cylinder, and the inlet cavity is connected to the piston rod; The injection head is provided with an injection cavity, the injection cavity is communicated with the transmission channel, the valve needle is coaxially arranged in the injection cavity, and one end of the valve needle is connected to the piston rod.

2. The single-cylinder hot runner device for decorative panel injection molding according to claim 1, characterized in that: The outer wall of the piston rod is provided with a protruding first limit piece, the transmission cylinder body is provided with a limit groove, the piston rod is located in the limit groove, the limit groove is provided with a second limit piece, and the first limit piece is located between the second limit piece and the inner wall of the limit groove.

3. The single-cylinder hot runner device for decorative panel injection molding according to claim 1, characterized in that: The diameter of the injection port of the injection head is smaller than the diameter of the injection cavity.

4. The single-cylinder hot runner device for decorative panel injection molding according to claim 3, characterized in that: The end of the valve needle close to the injection port is provided with a cone head.

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