An injection molding device for preventing the runner from breaking

Abstract

The present invention provides an injection molding device for preventing the runner from breaking, which includes a front mold mechanism and a rear mold mechanism. The front mold mechanism includes a front mold panel and a sprue puller pin. A locating ring and a sprue bushing are arranged inside the front mold panel. The locating ring and the sprue bushing are coaxially arranged. The top of the sprue puller pin is fixedly installed on the locating ring. A runner is arranged inside the sprue bushing. The runner includes a main runner and a sub-runner. The sub-runner is clamped on the side wall of the sprue puller pin. The present invention provides an injection molding device for preventing the runner from breaking, which increases the contact area and friction force between the sprue puller pin and the runner, and protects the runner from being easily stuck and broken in the mold.

Description

Technical Field

[0001] The present invention relates to the field of injection molding, and more particularly to an injection molding device for preventing the runner from breaking. Background Art

[0002] At present, the injection mold industry is undergoing continuous technological innovation and transformation. In a three-plate mold using a pin-point gate bushing, a sprue puller is used to temporarily fix the runner at the pin-point gate portion on the runner plate and cut off the gate from the molded product.

[0003] In the prior art, the front end portion of the sprue puller is in an undercut shape, which can forcibly demold the runner at the pin-point gate portion from the pin-point gate bushing. The contact area between the sprue puller and the runner is small, and the runner is easily stuck and broken in the mold, increasing the maintenance cost of the mold. Summary of the Invention

[0004] In view of this, the present invention provides an injection molding device for preventing the runner from breaking, which solves the problem that the runner is easily stuck and broken in the mold.

[0005] To this end, the present invention provides an injection molding device for preventing the runner from breaking, including a front mold mechanism and a rear mold mechanism. The front mold mechanism includes a front mold panel and a sprue puller. A locating ring and a gate bushing are arranged inside the front mold panel. The locating ring and the gate bushing are coaxially arranged. The top of the sprue puller is fixedly installed on the locating ring. A runner is arranged inside the gate bushing. The runner includes a main runner and a sub-runner. The sub-runner is clamped on the side wall of the sprue puller.

[0006] Further, the sub-runner is embedded and installed on the sprue puller.

[0007] Further, a groove is arranged on the surface of the sprue puller, and the sub-runner is fixedly installed in the groove.

[0008] Further, the depth of the groove is equal to the thickness of the sub-runner.

[0009] Further, the end face of the main runner is arc-shaped.

[0010] Further, the end face of the main runner is clamped on the side wall of the sprue puller.

[0011] Further, the front mold mechanism further includes a stripper plate and a front template. The stripper plate is arranged below the front mold panel, the front template is arranged below the stripper plate, and a front mold core is arranged at the bottom of the front template.

[0012] Further, a locking module is arranged on one side of the front mold mechanism.

[0013] Further, the rear mold mechanism includes a rear mold bottom plate, mold feet and a rear template.

[0014] Further, the mold feet are fixedly installed on the rear mold bottom plate, the rear template is fixedly installed on the mold feet, and a rear mold core is arranged on the rear template.

[0015] The present invention provides an injection molding device for preventing the runner from breaking, which is a three-plate injection mold. Its working principle is as follows: during injection molding, the front mold mechanism and the rear mold mechanism are closed. The plastic is sequentially injected into the injection insert positioned on the front mold core through the main runner and the sub-runners of the runner. After injection molding is completed, the rear mold mechanism moves downward. Before the front mold core and the rear mold core are separated, the stripping plate separates the runner from the front mold core, and the end of the sub-runner is separated from the product. Since the sub-runner is clamped on the side wall of the sprue puller pin, increasing the contact area between the sprue puller pin and the sub-runner and the friction between them, the sub-runner is not easily broken when it is separated from the front mold core. Then the rear mold mechanism continues to move downward, and the sprue puller pin separates the runner from the stripping plate, facilitating the disassembly of the runner.

[0016] The present invention provides an injection molding device for preventing the runner from breaking, which increases the contact area and friction between the sprue puller pin and the runner, and protects the runner from being easily broken and stuck in the mold. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] By reading the following detailed description of the preferred embodiments, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of the present invention. Moreover, throughout the drawings, the same reference numerals are used to represent the same components. In the drawings:

[0018] Figure 1 is a schematic structural diagram of an injection molding device for preventing the runner from breaking provided by an embodiment of the present invention;

[0019] Figure 2 is a schematic installation structure diagram of the sprue puller pin and the runner in an injection molding device for preventing the runner from breaking provided by an embodiment of the present invention;

[0020] Figure 3 is a disassembled view of the sprue puller pin and the runner in an injection molding device for preventing the runner from breaking provided by an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] The following will describe the exemplary embodiments of the present disclosure in more detail with reference to the drawings. Although the exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0022] Embodiment 1:

[0023] SeeFigures 1 to 3 As shown in the figure, there is shown an injection molding device for preventing runner breakage provided in the first embodiment of the present invention, which includes a front mold mechanism 1 and a rear mold mechanism 2. The front mold mechanism 1 includes a front mold panel 11 and a sprue puller 12. A locating ring 6 and a sprue bushing 3 are arranged inside the front mold panel 11. The locating ring 6 and the sprue bushing 3 are coaxially arranged. The top of the sprue puller 12 is fixedly installed on the locating ring 6. The runner 4 includes a main runner 41 and a sub-runner 42. The sub-runner 42 is clamped on the side wall of the sprue puller 12.

[0024] Specifically, referring to Figures 1 to 3 , the front mold mechanism 1 further includes a stripper plate 13 and a front template 14. The stripper plate 13 is arranged below the front mold panel 11. The front template 14 is arranged below the stripper plate 13. A front mold core 141 is arranged at the bottom of the front template 14.

[0025] Specifically, referring to Figures 1 to 3 , the rear mold mechanism 2 includes a rear mold bottom plate 21, mold feet 22 and a rear template 23. The mold feet 22 are fixedly installed on the rear mold bottom plate 21. The rear template 23 is fixedly installed on the mold feet 22. A rear mold core 231 is arranged on the rear template 23.

[0026] The present invention provides an injection molding device for preventing runner breakage, which is a three-plate injection mold. Its working principle is as follows: During injection molding, the front mold mechanism and the rear mold mechanism are closed. The plastic sequentially passes through the main runner and the sub-runner of the runner to inject glue into the injection insert positioned on the front mold core. After injection molding is completed, the rear mold mechanism moves downward. Before the front mold core and the rear mold core are separated, the stripper plate separates the runner from the front mold core. The end of the sub-runner is separated from the product. Since the sub-runner is clamped on the side wall of the sprue puller, the contact area between the sprue puller and the sub-runner is increased, and the friction force between the sprue puller and the sub-runner is increased. Therefore, the sub-runner is not easily adhered and broken when separating from the front mold core. Then the rear mold mechanism continues to move downward, and the sprue puller separates the runner from the stripper plate, facilitating the disassembly of the runner.

[0027] The present invention provides an injection molding device for preventing runner breakage, which increases the contact area and friction force between the sprue puller and the runner, and protects the runner from being easily adhered and broken in the mold.

[0028] Embodiment Two:

[0029] Referring to Figures 1 to 3 , as shown in the figure, there is shown an injection molding device for preventing runner breakage provided in the second embodiment of the present invention. On the basis of the above embodiment, the following further improved technical solutions are made: The sub-runner 42 is embedded and installed on the sprue puller 12; a groove 121 is arranged on the surface of the sprue puller 12. The sub-runner 32 is fixedly installed in the groove 121. The depth of the groove 121 is equal to the thickness of the sub-runner 42; the end face of the main runner 42 is arc-shaped, and the end face of the main runner 42 is clamped on the side wall of the sprue puller 12.

[0030] The sub - runner is embedded in the groove of the sprue puller pin, and the sprue puller pin wraps the sub - runner, further increasing the contact area between the sprue puller pin and the sub - runner, increasing the frictional force, reducing the contact area between the sub - runner and the mold, and greatly reducing the risk of the sub - runner sticking and breaking. In order to make the installation of the sprue puller pin and the runner more fitting, the end face of the main runner is arc - shaped and is clamped on the side wall of the sprue puller pin.

[0031] Embodiment Three:

[0032] See Figures 1 to 3 , which shows an injection molding device for preventing the runner from breaking provided in Embodiment Three of the present invention. On the basis of the above - mentioned embodiment, the following further improved technical solutions are made: A locking module 5 is arranged on one side of the front mold mechanism 1.

[0033] One end of the locking module is fixedly installed on the front mold mechanism. When the mold is hoisted as a whole, the other end is fixedly connected to the rear mold mechanism to prevent the separation of the front mold mechanism and the rear mold mechanism.

[0034] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and its equivalent technologies, the present invention is also intended to include these changes and modifications.

Claims

1. An injection molding device for preventing runner breakage, characterized in that, it includes a front mold mechanism (1) and a rear mold mechanism (2). The front mold mechanism (1) includes a front mold panel (11) and a sprue puller pin (12). A locating ring (6) and a sprue bushing (3) are arranged inside the front mold panel (11). The locating ring (6) and the sprue bushing (3) are coaxially arranged. The top of the sprue puller pin (12) is fixedly installed on the locating ring (6). A runner (4) is arranged inside the sprue bushing (3). The runner (4) includes a main runner (41) and a sub-runner (42). The sub-runner (42) is clamped on the side wall of the sprue puller pin (12); The sub-runner (42) is embedded and installed on the sprue puller pin (12); A groove (121) is arranged on the surface of the sprue puller pin (12), and the sub-runner (42) is fixedly installed in the groove (121); The depth of the groove (121) is equal to the thickness of the sub-runner (42); The end face of the main runner (41) is arc-shaped; The end face of the main runner (41) is clamped on the side wall of the sprue puller pin (12).

2. The injection molding device for preventing runner breakage according to claim 1, characterized in that, the front mold mechanism (1) further includes a stripper plate (13) and a front template (14). The stripper plate (13) is arranged below the front mold panel (11). The front template (14) is arranged below the stripper plate (13). A front mold core (141) is arranged at the bottom of the front template (14).

3. The injection molding device for preventing runner breakage according to claim 1, characterized in that, a locking module (5) is arranged on one side of the front mold mechanism (1).

4. The injection molding device for preventing runner breakage according to claim 1, characterized in that, the rear mold mechanism (2) includes a rear mold bottom plate (21), mold feet (22) and a rear template (23).

5. The injection molding device for preventing runner breakage according to claim 4, characterized in that, the mold feet (22) are fixedly installed on the rear mold bottom plate (21), the rear template (23) is fixedly installed on the mold feet (22), and a rear mold core (231) is arranged on the rear template (23).

Images