Long-stroke helical rack core-pulling mechanism

Abstract

The utility model provides a long-stroke helical rack core-pulling mechanism, and relates to the technical field of mold structures. Comprising a plurality of first racks connected to a front mold and provided with helical teeth and a plurality of second racks arranged on a rear mold and meshed with the first racks; the second rack is connected to a sliding block, and an insert pin is connected to the sliding block; and during mold opening, the front mold is suitable for driving the first rack to move, and the first rack is suitable for synchronously driving the second rack to move so as to drive the sliding block to move outwards, so that the insert pin is driven to pull a core outwards. According to the scheme, a long core-pulling stroke can be obtained in a small mold opening stroke, and the core-pulling structure is optimized.

Description

TECHNICAL FIELD

[0001] The utility model relates to die structure technical field, specifically, relate to a long stroke helical rack core-pulling mechanism. BACKGROUND

[0002] In injection mold design, core-pulling mechanism is the key component for mold opening and product demolding. The traditional inclined guide pillar core-pulling mechanism usually has a maximum 25-degree angle, which limits the length of the core-pulling stroke. In applications requiring a larger core-pulling stroke, the traditional mechanism may not meet the requirements. SUMMARY

[0003] The utility model discloses a long stroke helical rack core-pulling mechanism, aims at solving the above-mentioned problem.

[0004] The utility model discloses the following schemes are adopted:

[0005] A long stroke helical rack core-pulling mechanism, comprising: a plurality of first racks with helical teeth connected to a front mold and a plurality of second racks meshing with the first racks arranged on a rear mold; the second rack is connected to a sliding block, and a pin is connected to the sliding block; when the mold is opened, the front mold is adapted to drive the first rack to displace, and the first rack is adapted to synchronously drive the second rack to displace to drive the sliding block to move outward, thereby driving the pin to core-pull outward.

[0006] Further, the helical tooth angle of the first rack and the second rack is 20°-45°.

[0007] Further, the helical tooth angle of the first rack and the second rack is 40°.

[0008] Further, the first rack includes two groups, each group having two first racks; the second rack is symmetrically arranged in two groups corresponding to the first rack, each group having two second racks; the sliding block is symmetrically arranged in two groups and correspondingly arranged on opposite sides of the rear mold, each group of sliding blocks being connected to a group of second racks; when the mold is opened, the front mold is adapted to drive the two groups of first racks to displace synchronously, and each group of first racks is adapted to synchronously drive the second racks to displace to drive the two groups of sliding blocks to core-pull outward in opposite directions synchronously.

[0009] Further, the second rack is connected to the sliding block through a fixing seat.

[0010] Beneficial effects:

[0011] The utility model discloses a long-stroke helical rack core-pulling mechanism of injection mould, and belongs to the technical field of injection mould. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 It is the structure schematic diagram of the mould of the long-stroke helical rack core-pulling mechanism of the utility model embodiment;

[0013] Figure 2 It is the exploded structure schematic diagram of the mould of the long-stroke helical rack core-pulling mechanism of the utility model embodiment;

[0014] Figure 3 It is the state schematic diagram of the long-stroke helical rack core-pulling mechanism of the utility model embodiment when opening mould;

[0015] Figure 4 It is the rack connection structure schematic diagram of the long-stroke helical rack core-pulling mechanism of the utility model embodiment;

[0016] Reference signs: front mould 1, back mould 2, slider 3, first rack 4, second rack 5, helical tooth 6, fixed seat 7, insert pin 8. DETAILED DESCRIPTION

[0017] Combining Figures 1 to 4 As shown in the figure, the embodiment provides a mould, which comprises a front mould 1 and a back mould 2, and further comprises a long-stroke helical rack core-pulling mechanism. The long-stroke helical rack core-pulling mechanism comprises: a plurality of first racks 4 with helical tooth 6 connected to the front mould 1 and a plurality of second racks 5 meshing with the first racks 4 arranged on the back mould 2; the second racks 5 are connected to sliders 3, and the sliders 3 are connected with insert pins 8; when opening mould, the front mould 1 is suitable for driving the first racks 4 to displace, and the first racks 4 are suitable for synchronously driving the second racks 5 to displace to drive the sliders 3 to move outward, and then drive the insert pins 8 to core-pull outward.

[0018] The product cavity is formed between the front mold 1 and the rear mold 2. The first rack 4 is vertically connected to the front mold 1, the second rack 5 is connected to the rear mold 2, and the second rack 5 is vertically engaged with the first rack 4. The first rack 4 and the second rack 5 are provided with inclined teeth 6 that can be engaged with each other, and the angle of the inclined teeth 6 is 20°-45°. By increasing the angle of the inclined teeth 6 of the rack, more core pulling strokes can be obtained under the same mold opening distance, and the angle of the inclined teeth 6 can be up to 45°. Preferably, the angle of the inclined teeth 6 of the first rack 4 and the second rack 5 is 40°. The second rack 5 is connected to the slider 3 through the fixing seat 7.

[0019] In combination Figures 1 to 4 In another embodiment, the first rack 4 includes two groups, each group is provided with two first racks 4; the second rack 5 is symmetrically provided with two groups corresponding to the first rack 4, each group is provided with two second racks 5; the slider 3 is symmetrically provided with two groups, and is correspondingly provided on the opposite sides of the rear mold 2, each group of sliders 3 is connected with a group of second racks 5; when the mold is opened, the front mold 1 is suitable for driving two groups of first racks 4 to move synchronously, each group of first racks 4 is suitable for driving the second rack 5 to move synchronously to drive two groups of sliders 3 to move synchronously outward in opposite directions. In this embodiment, two groups of inclined rack core pulling mechanisms are provided, the inclined teeth 6 of the two groups of second racks 5 are opposite to each other, so that the two groups of second racks 5 can move in opposite directions under the driving of the first rack 4, and then the sliders 3 connected to the two ends of the rear mold 2 move outward in opposite directions to complete the core pulling of the two groups of inserts 8 in opposite directions.

[0020] In combination Figure 3 When the mold is opened, the front mold 1 moves upward relative to the rear mold 2, which can drive four first racks 4 to move upward synchronously. The upward movement of the first rack 4 drives the second rack 5 to move horizontally outward in a vertical direction, and the two groups of second racks 5 move in opposite directions. The second rack 5 drives the slider 3 to move outward synchronously, and the insert 8 is connected to the slider 3, so that the insert 8 can be pulled out synchronously with the slider 3 to realize core pulling.

[0021] In this embodiment, the rack with inclined teeth 6 is provided, which can obtain more core pulling strokes under the same mold opening distance. By increasing the angle of the inclined teeth 6 of the rack, more core pulling strokes can be further obtained, which improves the production efficiency of the injection mold and the molding quality of the product; simplifies the mold design, and reduces the complexity and cost of mold manufacturing.

[0022] It should be understood that the above are only preferred embodiments of the present application, and the protection scope of the present application is not limited to the above-mentioned embodiments, and any technical solutions falling within the concept of the present application shall fall within the protection scope of the present application.

[0023] The above introduction of the drawings used in the embodiments only shows some embodiments of the present application, and should not be regarded as a limitation on the scope, and for ordinary skilled in the art, other related drawings can also be obtained according to the drawings without creative labor.

Claims

1. A long-stroke helical rack core-pulling mechanism, characterized by, The application relates to a core-pulling mechanism for a die, which comprises: a plurality of first racks with inclined teeth connected to a front die and a plurality of second racks with inclined teeth arranged on a rear die and engaged with the first racks; the second racks are connected to sliders, and the sliders are connected with insert pins; when the die is opened, the front die is adapted to drive the first racks to displace, and the first racks are adapted to synchronously drive the second racks to displace to drive the sliders to move outward, thereby driving the insert pins to move outward. The inclined tooth angle of the first rack and the second rack is 20-45 degrees.

2. A long-stroke helical rack and core mechanism according to claim 1, wherein The inclined tooth angle of the first rack and the second rack is 40 degrees.

3. A long-stroke helical rack and core mechanism according to claim 2, wherein The first rack comprises two groups, each group being provided with two first racks; the second rack is symmetrically provided with two groups corresponding to the first rack, each group being provided with two second racks; the slider is symmetrically provided with two groups and is correspondingly arranged on opposite sides of the rear die, and each group of the slider is connected with one group of the second rack; when the die is opened, the front die is adapted to drive the two groups of first racks to synchronously displace, and each group of the first rack is adapted to synchronously drive the second rack to displace to drive the two groups of sliders to synchronously move outward in opposite directions.

4. The long-stroke helical rack and core mechanism of claim 1, wherein, The second rack is connected with the slider through a fixing seat.

5. The long-stroke helical rack and core mechanism of claim 1, wherein, ​

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