Linkage structure of injection mold

Abstract

The linkage structure comprises three groups of sliding block inserts which are annularly distributed on a front mold in 360 degrees, the sliding block inserts are hinged to a shared disc sliding block seat through sliding block bases, and the disc sliding block seat is driven by a single oil cylinder to rotate so as to drive three groups of sliding blocks to perform synchronous core pulling. And compared with a traditional independent driving structure, the occupied mold space is reduced by more than 30%, the machining cost is reduced, and the device can adapt to small injection molding machine tables.

Description

Injection mold linkage structure Technical Field

[0001] This invention relates to the field of plastic mold technology, and in particular to a linkage structure for injection molds. Background Technology

[0002] In traditional injection molds, multi-slider core-pulling structures require each slider to be driven by a separate inclined guide post or hydraulic cylinder, resulting in large mold space occupation and high processing costs. Some industry solutions use independent multi-slider drives, which require multiple hydraulic cylinder mounting positions, limiting mold size and demanding high-performance machine requirements. Other solutions use inclined guide posts, but these cannot precisely control the synchronous movement of multiple sliders, easily leading to product deformation. In short, existing technologies suffer from drawbacks such as large space occupation due to independent multi-slider drives, limiting mold miniaturization; increased processing costs due to inclined guide posts or independent hydraulic cylinders; and the need for high-tonnage injection molding machines. Therefore, there is an urgent need to solve the problems of large mold size, high cost, and the need for large injection molding machines caused by the independent drives of traditional multi-slider core-pulling structures. Summary of the Invention

[0003] The purpose of this invention is to provide a linkage structure for injection molds, which features a simple and compact mold layout and reduced processing costs.

[0004] The technical solution adopted in this invention is: an injection mold linkage structure, the linkage structure comprising:

[0005] The front mold and the front mold plate are fixed by the plate limit block, and a disc slider seat is movably installed between them;

[0006] Three sets of slider inserts are arranged in a 360° ring, and the tail is hinged to the disc slider seat through the slider base and bearing pins.

[0007] The slider guide sleeve is fixed to the front mold and slides in conjunction with the slider insert;

[0008] The hydraulic cylinder is mounted on a front template and drives the disc slider seat to rotate via a hydraulic cylinder insert and bearing pin.

[0009] A limiting block is located at the front end of the cylinder insert and is used to constrain the rotation angle of the disc slider seat.

[0010] The rotation axis of the disc slider seat coincides with the central axis of the front mold, and the ratio of its diameter to the diameter of the slider distribution circle is 1:1.2.

[0011] The linear motion of the cylinder insert is converted into the rotational motion of the disc slider seat through the bearing pin, and the ratio of the cylinder stroke to the slider core-pulling stroke is 1:3.

[0012] The clearance between the bearing pin and the slider base is ≤0.02mm, and the bearing pin and the mounting hole of the disc slider base are interference fit.

[0013] The advantages of this invention compared to existing technologies are: simple and compact mold layout, and reduced processing costs. The injection mold linkage structure of this invention is connected to a shared circular slide block seat via bearing pins. The circular slide block seat is driven to rotate by a single hydraulic cylinder, causing three sets of slide blocks to synchronously pull the core. Compared to traditional multi-slider independent drive structures, the integrated circular slide block seat design reduces space occupation, simplifies mold layout, lowers processing costs, and is adaptable to small injection molding machines, generally reducing space occupation by 30%. Attached Figure Description

[0014] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0015] Figure 1 is a perspective view of an embodiment of the present invention;

[0016] Figure 2 is a perspective view of some components of an embodiment of the present invention.

[0017] In the picture:

[0018] 1. Front template, 2. Hydraulic cylinder, 3. Hydraulic cylinder insert, 4. Pressure plate limiting block, 5. Front mold, 6. Disc slider seat, 7. Front mold pressure plate, 8. Slider insert, 9. Limiting block, 10. Bearing pin, 11. Slider base, 12. Slider guide sleeve. Detailed Implementation

[0019] An example, as shown in Figures 1 and 2, is an injection mold linkage structure comprising the following main components:

[0020] The front mold 5 and the front mold pressure plate 7 are fixed together by a pressure plate limiting block 4. For example, both the front mold 5 and the front mold pressure plate 7 are fixed to the pressure plate limiting block 4 with screws. At the same time, a disc slider seat 6 is movably installed between the front mold 5 and the front mold pressure plate 7.

[0021] Three sets of slider inserts 8. The three sets of slider inserts 8 are evenly distributed in a 360° ring, and the tail of each slider insert 8 is hinged to the disc slider seat 6 through a slider base 11. The hinged component is a bearing pin 10. The tail of the slider insert 8 is generally connected to the slider base 11 through an L-shaped groove.

[0022] Slider guide sleeve 12. The slider guide sleeve 12 is fixed to the front mold 5 and slides with the slider insert 8. That is, the slider insert 8 slides along the slider guide sleeve 12.

[0023] Hydraulic cylinder 2. Hydraulic cylinder 2 is mounted on a front template 1 and drives the disc slide block 6 to rotate via a hydraulic cylinder insert 3 and bearing pin 10. Generally, the front mold 5 is fixed inside the front template 1 by screws.

[0024] Limiting block 9. Limiting block 9 is located at the front end of the cylinder insert 3 and is used to constrain the rotation angle of the disc slider seat 6.

[0025] Optimized:

[0026] The rotation axis of the disc slider seat 6 coincides with the central axis of the front mold 5, and the ratio of its diameter to the diameter of the slider distribution circle is 1:1.2.

[0027] The linear motion of the cylinder insert 3 is converted into the rotational motion of the disc slider seat 6 through the bearing pin 10, and the ratio of the cylinder stroke to the slider core-pulling stroke is 1:3.

[0028] The clearance between the bearing pin 10 and the slider base 11 is ≤0.02mm, and the mounting hole of the bearing pin 10 and the disc slider base 6 is interference fit.

[0029] in:

[0030] The disc slider seat 6 serves as the core transmission component and is hinged to the slider base 11 via three sets of bearing pins 10.

[0031] The hydraulic cylinder 2 forms a single hydraulic cylinder drive, which drives the disc slider seat 6 to rotate through the hydraulic cylinder insert 3, so as to realize the synchronous core pulling of the three sliders.

[0032] The limit block 9 precisely controls the rotation angle of the disc slider seat 6 to ensure consistent core pulling stroke.

[0033] The working principle of this invention is as follows: When the mold is closed, the hydraulic cylinder 2 is in the retracted position, and the disc slide block 6 is connected to the hydraulic cylinder insert 3 through the bearing pin 10. Before the mold opens, the hydraulic cylinder 2 starts and pulls the hydraulic cylinder insert 3 backward a certain distance, such as 20mm, driving the disc slide block 6 to rotate counterclockwise by 30°, which in turn drives the three sets of slide block bases 11 and slide block inserts 8 to synchronously pull the core outward by 15mm along the slide block guide sleeve 12. After the core is pulled out, the ejector mechanism ejects the product; when the mold closes, the hydraulic cylinder 2 pushes the hydraulic cylinder insert 3 to reset, and the slide block insert 8 retracts to the forming position.

[0034] To achieve the best results, some parameters can be optimized:

[0035] The diameter of the disc slider base 6 is 120mm, and the diameter of the slider distribution circle is 144mm.

[0036] The hydraulic cylinder stroke is 20mm, the core-pulling stroke is 15mm, and the transmission ratio is 1:0.75.

[0037] The travel tolerance of limit block 9 is ±0.1mm.

[0038] The injection mold linkage structure of this invention employs three sets of slider inserts arranged in a 360° ring on the front mold. The slider inserts are hinged to a shared circular slider seat via a slider base. The circular slider seat is driven to rotate by a single hydraulic cylinder, causing the three sets of sliders to synchronously pull the core. Compared to traditional independent drive structures, the integrated circular slider seat design reduces mold space occupancy by more than 30%, lowers processing costs, and is suitable for small injection molding machines.

[0039] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A linkage structure for injection molds, characterized in that: The linkage structure includes: a front mold (5) and a front mold pressure plate (7), which are fixed by a pressure plate limiting block (4), and a disc slider seat (6) is movably installed between them; three sets of slider inserts (8), which are distributed in a 360° ring, and their tails are hinged to the disc slider seat (6) by a bearing pin (10) through a slider base (11); a slider guide sleeve (12), which is fixed on the front mold (5) and slides with the slider inserts (8); a hydraulic cylinder (2), which is installed on a front template (1) and drives the disc slider seat (6) to rotate through a hydraulic cylinder insert (3) and a bearing pin (10); and a limiting block (9), which is located at the front end of the hydraulic cylinder insert (3) and is used to constrain the rotation angle of the disc slider seat (6).

2. The injection mold linkage structure according to claim 1, characterized in that: The rotation axis of the disc slider seat (6) coincides with the central axis of the front mold (5), and the ratio of its diameter to the diameter of the slider distribution circle is 1:1.

2.

3. The injection mold linkage structure according to claim 1, characterized in that: The linear motion of the cylinder insert (3) is converted into the rotational motion of the disc slider seat (6) through the bearing pin (10), and the ratio of the cylinder stroke to the slider core pulling stroke is 1:

3.

4. The injection mold linkage structure according to claim 1, characterized in that: The clearance between the bearing pin (10) and the slider base (11) is ≤0.02mm, and the bearing pin and the mounting hole of the disc slider base (6) are interference fit.

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