Front die tunneling inclined extraction structure

Abstract

The front mold tunnel type inclined pulling structure belongs to the mold forming technology, is arranged in a plastic mold, and comprises an inclined pulling fixing seat and an inclined pulling rod arranged at a fixing plate and an upper mold plate of the plastic mold. The inclined pulling fixing seat is freely lifted along a preset tunnel of the upper mold plate. The upper end of the inclined pulling rod is slidably connected along a preset track of the lower part of the inclined pulling fixing seat. The lower end of the inclined pulling rod is freely inserted into and pulled out of a closed part of a reversed buckling plastic part. When the mold is opened, the upper end of the inclined pulling rod slides along the track, and the lower end of the inclined pulling rod is pulled out of the closed part, so that the upper and lower pressures of the plastic part are balanced, demolding is facilitated, the core pulling problem in the case of small demolding stroke and insufficient space is solved, the mold structure is simplified, cost is saved, and the effect is remarkable.

Description

Technical Field

[0001] This utility model belongs to the field of mold forming technology, and particularly relates to plastic molds, specifically a mold core pulling structure applied to plastic molds. Background Technology

[0002] In toy manufacturing and other fields, plastic molds are used for injection molding of toy plastic parts. Often, these parts are in an inverted state within the mold. After injection molding, a core-pulling action is required to balance the pressure on both sides of the inverted part, allowing it to detach from the mold and thus open the mold to remove the finished product. Traditionally, hydraulic cylinder core-pulling systems are used in mold opening equipment. However, hydraulic cylinders are large, occupying significant space, and require hydraulic circuitry for operation and control, leading to time-consuming installation and significantly increased mold costs. Furthermore, hydraulic cylinder core-pulling cannot be synchronized with the mold opening action; the cylinder must operate first, affecting molding efficiency. Therefore, there is an urgent need for a mold core-pulling structure that can replace hydraulic cylinder core-pulling, simplify the structure, and reduce costs. Utility Model Content

[0003] To address the shortcomings of existing technologies, this invention proposes a front mold tunnel-type inclined extraction structure to solve the core-pulling problem when the demolding stroke is small and space is insufficient, thereby simplifying the mold structure and saving costs.

[0004] The technical problem to be solved by this utility model is achieved through the following technical solution:

[0005] A tunnel-type inclined pull structure is installed in a plastic mold. The plastic mold includes an upper fixed plate, an upper template, and a lower template. The injection-molded undercut plastic part is located between the upper template and the lower template. In this utility model, the upper template is provided with an inclined pull fixing seat, which can freely rise and fall along the tunnel preset in the upper template. An inclined pull rod is provided at the lower part of the inclined pull fixing seat. The upper end of the inclined pull rod slides along the preset track at the lower part of the inclined pull fixing seat, and the lower end of the inclined pull rod can freely insert and remove the closed part of the undercut plastic part.

[0006] In this invention, the track at the bottom of the inclined pull fixing seat faces the plastic part, and the inclined pull rod maintains a fixed angle during the sliding process along the track.

[0007] Furthermore, the track includes a T-slot disposed within the inclined pull fixing seat, and the upper end of the inclined pull rod is embedded in the T-slot.

[0008] In this utility model, the upper part of the inclined drawer fixing seat is fixedly connected to the upper fixing plate by bolts, and an opening limiting structure is also provided between the upper fixing plate and the upper template to constrain the maximum lifting distance of the inclined drawer fixing seat relative to the upper template.

[0009] Furthermore, the mold opening limiting structure includes a limiting bolt inserted into the upper template. One end of the limiting bolt is expanded into a bolt head, and the other end of the limiting bolt passes through the upper template and is screwed to the upper fixing plate. The lower part of the upper template is provided with a bolt limiting groove for the bolt head to move up and down. The height of the bolt limiting groove is greater than the height of the limiting bolt, and the height difference is the lifting and lowering distance of the limiting bolt, that is, the mold opening distance between the upper fixing plate and the upper template.

[0010] Furthermore, the upper part of the upper template is provided with a spring mounting groove, which contains a bolt spring. The bolt spring is sleeved outside the limiting bolt, with one end fixed to the bottom of the spring mounting groove and the other end fixedly connected to the upper fixing plate.

[0011] Compared with the prior art, the present invention has the following advantages:

[0012] (1) This application reduces the overall size of the mold and improves the structural compactness by linking the inclined pull fixing seat and the inclined pull rod. It occupies little space and is suitable for mold design schemes with insufficient space.

[0013] (2) This application synchronizes the inclined pulling structure with the mold opening action, and controls the timing precisely to achieve seamless connection, shorten the molding cycle, and solve the efficiency problem of the traditional hydraulic cylinder structure that requires the action to be performed before the mold opening.

[0014] (3) This application can achieve multi-angle demolding for special undercuts such as oblique holes in the front mold, and has a wide range of applications;

[0015] (4) This application does not require a hydraulic cylinder and hydraulic circuit system, which simplifies the mold structure, reduces the installation difficulty and production cost, and the workpiece is easy to process, easy to assemble, and has high stability. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of this application (closed mold state);

[0017] Figure 2 This is a schematic diagram of the connection structure between the inclined pull rod and the inclined pull fixing seat in this application;

[0018] Figure 3 This is a schematic diagram of the mold opening state structure of this application.

[0019] In the diagram: 1. Upper fixing plate; 2. Upper template; 3. Lower template; 4. Limiting bolt; 5. Bolt spring; 6. Angled pull fixing seat; 7. Angled pull rod; 8. Plastic part; 9. Track; 10. Bolt cap; 11. Bolt limiting groove. Detailed Implementation

[0020] The present invention will be further described below with reference to the accompanying drawings and specific preferred embodiments, but this does not limit the scope of protection of the present invention.

[0021] A front-mold tunnel-type oblique extraction structure is set in the plastic mold, such as... Figure 1 As shown, the plastic mold includes an upper fixed plate 1, an upper template 2, and a lower template 3. An injection cavity is provided between the upper template 2 and the lower template 3, and a plastic part 8 with an undercut structure is injection molded in the injection cavity. The upper template 2 is provided with a slanted pull structure and a mold opening limiting structure, which are located on the left and right sides of the upper template 2, respectively.

[0022] Combination Figure 1 and Figure 2 The inclined pull structure includes a matching inclined pull rod 7 and an inclined pull fixing seat 6. The inclined pull fixing seat 6 is installed in the vertical tunnel preset in the upper template 2. The lower part of the inclined pull fixing seat 6 is provided with an inclined track 9. The track 9 is T-shaped and its opening faces the plastic part 8. The upper end of the inclined pull rod 7 is embedded in the track 9 and slides with it. The inclined pull rod 7 maintains a fixed angle during the sliding process along the track 9. The lower end of the inclined pull rod 7 can be freely inserted and pulled into the closed part of the plastic part 8.

[0023] The mold opening limiting structure constrains the maximum lifting distance of the inclined pull fixing seat 6 relative to the upper template 2, including the limiting bolt 4 passing through the upper template 2. One end of the limiting bolt 4 is expanded into a bolt cap 10, and the other end of the limiting bolt 4 passes through the upper template 2 and is screwed to the upper fixing plate 1. The lower part of the upper template 2 is provided with a bolt limiting groove 11 for the bolt cap 10 to move. The height of the bolt limiting groove 11 is greater than the height of the limiting bolt 4. The height difference is the lifting distance of the limiting bolt 4, that is, the maximum mold opening distance between the upper fixing plate 1 and the upper template 2. The upper part of the upper template 2 is provided with a spring mounting groove, in which a bolt spring 5 is installed. The bolt spring 5 is sleeved outside the limiting bolt 4, one end of which is fixed to the bottom of the spring mounting groove, and the other end is fixedly connected to the upper fixing plate 1.

[0024] This utility model applies to the mold opening process after injection molding of a plastic part 8 with an undercut structure. Before mold opening, as follows... Figure 1 As shown, the upper fixed plate 1 is pressed against the upper template 2. The bolt cap 10 of the limiting bolt 4 is located at the low position of the bolt limiting groove 11. The distance (a) between the upper end of the bolt cap 10 and the bottom of the bolt limiting groove 11 is at its maximum, and the bolt spring 5 is in a compressed state. When the mold is opened, the upper fixed plate 1 is lifted, and the upper fixed plate 1 carries the inclined pull fixing seat 6 and the limiting bolt 4 to rise synchronously. As the inclined pull fixing seat 6 rises, the upper end of the inclined pull rod 7 slides down along the track 9 at the lower part of the inclined pull fixing seat 6, and the lower end of the inclined pull rod 7 is pulled out from the closed part of the undercut plastic part 8. At the same time, the bolt cap 10 of the limiting bolt 4 rises from the low position of the bolt limiting groove 11, and the bolt spring 5 is stretched until the bolt cap 10 reaches the high position of the bolt limiting groove 11, a→0, as shown. Figure 3As shown, at this time, the distance (b) between the lower end of the inclined pull rod 7 and the closed part of the undercut plastic part 8 reaches its maximum, that is, the mold opening is completed, the upper and lower pressures of the undercut plastic part 8 are balanced, and the plastic part 8 can be easily demolded and removed by lifting the upper template 2.

[0025] In this embodiment, the angle of the angled pull rod is ≤30°, the maximum distance of a is less than 10 mm, and the maximum distance of b is about 2-3 mm.

[0026] In summary, based on the above structure and working process, it can be seen that the front mold tunnel-type inclined extraction structure of this application effectively solves the core-pulling problem when the demolding stroke is small and the space is insufficient, simplifies the mold structure and saves costs, with significant effects.

Claims

1. A front-mold tunnel-type inclined extraction structure is set in a plastic mold, the plastic mold including an upper fixed plate, an upper template and a lower template, the injection-molded undercut plastic part being located between the upper template and the lower template, characterized in that: The upper template is provided with a slanted pull-out fixing seat, which can freely rise and fall along the pre-set tunnel of the upper template. A slanted pull rod is provided at the lower part of the slanted pull-out fixing seat. The upper end of the slanted pull rod slides along the pre-set track at the lower part of the slanted pull-out fixing seat. The lower end of the slanted pull rod can freely insert and remove the closed part of the inverted plastic part.

2. The oblique pulling structure according to claim 1, characterized in that: The track at the bottom of the inclined pull fixing seat faces the plastic part, and the inclined pull rod maintains a fixed angle as it slides along the track.

3. The oblique pulling structure according to claim 2, characterized in that: The track includes a T-shaped groove set in the inclined pull fixing seat, and the upper end of the inclined pull rod is embedded in the T-shaped groove.

4. The oblique pulling structure according to claim 1, characterized in that: The upper part of the inclined drawer fixing seat is fixedly connected to the upper fixing plate by bolts. An opening limiting structure is also provided between the upper fixing plate and the upper template to constrain the maximum lifting distance of the inclined drawer fixing seat relative to the upper template.

5. The oblique pulling structure according to claim 4, characterized in that: The mold opening limiting structure includes a limiting bolt inserted into the upper template. One end of the limiting bolt is expanded into a bolt head, and the other end of the limiting bolt passes through the upper template and is screwed to the upper fixing plate. The lower part of the upper template is provided with a bolt limiting groove for the bolt head to move up and down. The height of the bolt limiting groove is greater than the height of the limiting bolt, and the height difference is the lifting and lowering distance of the limiting bolt, that is, the mold opening distance between the upper fixing plate and the upper template.

6. The oblique pulling structure according to claim 5, characterized in that: The upper part of the upper template is provided with a spring mounting groove, and a bolt spring is installed inside. The bolt spring is sleeved outside the limit bolt, with one end fixed to the bottom of the spring mounting groove and the other end fixedly connected to the upper fixing plate.

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