Multi-angle inclined core pulling mechanism

Abstract

This utility model relates to the field of injection molding. It discloses a multi-angle inclined core-pulling mechanism, comprising: a rear mold core, a caulking insert, and a core-pulling mechanism. The core-pulling mechanism includes a connecting rod, an inner hole insert, a pin, a slide block, and a fixed seat. The upper surface of the rear mold core has a main runner, and cavities are evenly spaced along the length of the rear mold core on both sides of the main runner. The lower surface of the rear mold core has several insert grooves. The caulking insert is positioned between the main runner and the cavity. The upper surface of the caulking insert has a runner and a parting surface arranged sequentially along the direction away from the main runner. The inner hole insert is slidably disposed within the insert groove, and the slide block is slidably disposed within the fixed seat. The inner hole insert and the slide block are respectively located at the upper and lower ends of the connecting rod. One end of the pin is positioned at the edge of the inner hole insert. The demolding direction of the inner hole insert is inclined and away from the main runner to avoid collisions during core-pulling mechanism demolding. The cold slug at the leading edge will be retained at the bottom of the runner, ensuring the quality of the injection molded product.

Description

Technical Field

[0001] This utility model relates to the field of injection molding, and in particular to a multi-angle inclined core-pulling mechanism. Background Technology

[0002] Injection molding is a mature molding technology widely used in electronic products such as mobile phones. The injection molding machine injects molten material into the mold cavity, which cools and solidifies to form a product of a specific shape. The product is then ejected by an ejection mechanism.

[0003] In molding Figure 7 and Figure 8 In the injection-molded product shown, an inclined inner hole 12 is formed. Since the inner hole 12 is square and has multiple angles, and because its orientation intersects the parting surface, an inclined core-pulling mechanism is required. The existing inclined core-pulling mechanism has one end located inside the cavity, and the other end extending in a square shape away from the center of the rear mold core. This causes the inserts inside the inner hole 12 to easily get stuck during mold opening, preventing the inner hole 12 from forming smoothly.

[0004] Because the inner hole 12 is relatively large and the inserts inside the inner hole 12 require angled core pulling, the angled core pulling mechanism is relatively large. In order to improve the space utilization of the rear mold core and avoid collisions between adjacent angled core pulling mechanisms during mold opening, the angled core pulling mechanisms are symmetrically distributed on the rear mold core. The cavity is close to the main runner on the rear mold core, and the close distance between the cavity and the main runner results in a short branch runner. The molten material inside the branch runner enters the cavity at a faster speed, and the leading cold material of the molten material inside the branch runner cannot completely enter the cold slug well. Some of the leading cold material enters the cavity, thus affecting the injection molding quality of the inner hole 12 wall. Utility Model Content

[0005] The purpose of this invention is to provide a multi-angle inclined core-pulling mechanism to solve the problem mentioned in the background art, which is that the short flow channel makes it easy for cold material at the front end to enter the cavity, resulting in defects on the inner hole wall.

[0006] To achieve the above objectives, this utility model adopts the following technical solution: a multi-angle inclined core-pulling mechanism, comprising:

[0007] The rear mold core has a main channel on its upper surface along its length, and cavities are evenly spaced on both sides of the main channel along the length of the rear mold core. The lower surface of the rear mold core has several insert grooves, and the insert grooves correspond one-to-one with the center of the cavity and are connected.

[0008] The glue-injecting insert is provided in a one-to-one correspondence with the mold cavity. The glue-injecting insert is located between the main flow channel and the mold cavity. The upper surface of the glue-injecting insert is provided with a branch channel and a parting surface in sequence along the direction away from the main flow channel. The cross-section of the branch channel gradually expands along the direction away from the main flow channel. The parting surface is embedded in the mold cavity and located above the bottom of the branch channel groove. The main flow channel, the branch channel and the mold cavity are connected in sequence.

[0009] The core-pulling mechanism includes a connecting rod, an inner hole insert, a pin, a slide block, and a fixed base. The inner hole insert is slidably disposed inside the insert groove, and the slide block is slidably disposed inside the fixed base. The inner hole insert and the slide block are detachably disposed at the upper and lower ends of the connecting rod, respectively. One end of the pin is disposed at the edge of the inner hole insert.

[0010] The centerline of the insert groove, the centerline of the inner hole insert, and the centerline of the adapter rod are collinear. The angle between the centerline of the adapter rod and the mold opening direction is an acute angle. The sliding direction of the slide block intersects the mold opening direction perpendicularly. The centerline of the adapter rod and the centerline of the main channel are on opposite planes.

[0011] Preferably, one end of the branch channel is connected to the main channel, and the other end of the branch channel is provided with an overflow port, which is connected to the cavity.

[0012] Preferably, a cold material well is provided in the middle of the distribution channel, and a ejector pin is provided inside the cold material well.

[0013] Preferably, the parting surface is a stepped parting surface, and the bottom of the overflow port is coplanar with the upper end of the parting surface.

[0014] Preferably, the sliding direction of the slide block forms an acute angle with the center line of the main channel.

[0015] Preferably, the angle between the centerline of the adapter rod and the centerline of the main channel is an acute angle.

[0016] Preferably, a forming block is protruding at the center of the surface of the inner hole insert away from the adapter rod, and there are multiple insert pins that are evenly spaced around the forming block. The cross-section of the forming block decreases in stages from the middle to both ends.

[0017] Preferably, the inner hole insert has a square protrusion on the surface away from the rear mold core, and one end of the adapter rod has a positioning groove, with the square protrusion located inside the positioning groove.

[0018] Preferably, a countersunk hole is provided at the edge of the surface of the inner hole insert that contacts the adapter rod, the insert pin corresponds to the countersunk hole one by one, and one end of the insert pin is set in the countersunk hole and abuts against the adapter rod.

[0019] Preferably, the core-pulling mechanism further includes a first screw and a second screw. The adapter rod has a stepped hole, the cross-section of which decreases progressively along the direction close to the inner hole insert. One end of the first screw is disposed in the stepped hole, and the other end of the first screw is threaded to the inner hole insert. The stepped hole has an internal thread at the end near the slide block. One end of the second screw is threaded to the internal thread, and the other end of the second screw is embedded inside the slide block.

[0020] The beneficial effects of this utility model are as follows: the core-pulling mechanisms are evenly distributed on both sides of the main channel, the core-pulling directions of the core-pulling mechanisms on one side of the main channel are parallel to each other, the demolding direction of the inner hole insert is inclined relative to the main channel, and the demolding direction of the inner hole insert is inclined and away from the main channel, so as to avoid the phenomenon of mutual collision of the core-pulling mechanisms during demolding and ensure smooth demolding.

[0021] When the molten material enters the manifold from the main runner, the cold leading edge of the molten material will enter the manifold. The two ends of the manifold are of different sizes. When the cold leading edge flows to the end of the manifold, it will be retained at the bottom of the manifold. The molten material at the top of the manifold will overflow to the parting surface and enter the cavity. This ensures the quality of the injection molded product. Attached Figure Description

[0022] The accompanying drawings further illustrate the present invention, but the embodiments in the drawings do not constitute any limitation on the present invention.

[0023] Figure 1 This is a schematic diagram of the structure of a multi-angle inclined core-pulling mechanism provided in an embodiment of the present invention;

[0024] Figure 2 This is a schematic diagram of the core-pulling mechanism provided in an embodiment of the present invention;

[0025] Figure 3 A cross-sectional view of a core-pulling mechanism provided in an embodiment of the present utility model;

[0026] Figure 4 This is a schematic diagram of the structure of an inner hole insert provided in an embodiment of the present utility model;

[0027] Figure 5 A cross-sectional view of a multi-angle inclined core-pulling mechanism provided in an embodiment of the present invention;

[0028] Figure 6 This is a schematic diagram of the structure of the glue-inserting part provided in one embodiment of the present utility model;

[0029] Figure 7 A three-dimensional injection molded product provided in an embodiment of this utility model Figure 1 ;

[0030] Figure 8A three-dimensional injection molded product provided in an embodiment of this utility model Figure 2 ;

[0031] The markings in the diagram are: 1. Rear mold core, 2. Main runner, 3. Cavity, 4. Fixed seat, 5. Slide, 6. Adapter rod, 7. Inner hole insert, 8. Insert pin, 9. Streamer, 10. Parting surface, 11. Inner hole. Detailed Implementation

[0032] The specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of this utility model.

[0033] It should be noted that, in this utility model, unless otherwise stated, when an element is referred to as "connected to" or "set on" another element, it can be directly on the other element or may have an intervening element present simultaneously. The directional terms used, such as "upper," "lower," "left," and "right," generally refer to... Figure 1 The directions shown are up, down, left, and right. "Inner" and "outer" refer to the inner and outer parts of a specific outline. "Far" and "near" refer to the distance or proximity relative to a particular component.

[0034] like Figures 1-6 As shown in the figure, an embodiment of the present invention provides a multi-angle inclined core-pulling mechanism, comprising:

[0035] The rear mold core 1 has a main channel 2 on its upper surface along its length direction. Both sides of the main channel 2 are evenly spaced cavities 3 along the length direction of the rear mold core 1. The lower surface of the rear mold core 1 has a plurality of insert grooves, which correspond one-to-one with and are connected to the middle of the cavity 3.

[0036] A glue inlet insert 9 is provided, which is corresponding to the cavity 3. The glue inlet insert 9 is located between the main channel 2 and the cavity 3. The upper surface of the glue inlet insert 9 is provided with a branch channel 10 and a parting surface 11 in sequence along the direction away from the main channel 2. The cross-section of the branch channel 10 gradually expands along the direction away from the main channel 2. The parting surface 11 is embedded in the cavity 3 and located above the bottom of the groove of the branch channel 10. The main channel 2, the branch channel 10 and the cavity 3 are connected in sequence.

[0037] The core-pulling mechanism includes an adapter rod 6, an inner hole insert 7, an insert pin 8, a slide block 5, and a fixed base 4. The inner hole insert 7 is slidably disposed inside the insert groove, and the slide block 5 is slidably disposed inside the fixed base 4. The inner hole insert 7 and the slide block 5 are detachably disposed at the upper and lower ends of the adapter rod 6, respectively. One end of the insert pin 8 is disposed at the edge of the inner hole insert 7.

[0038] The centerline of the insert groove, the centerline of the inner hole insert 7, and the centerline of the adapter rod 6 are collinear. The angle between the centerline of the adapter rod 6 and the mold opening direction is an acute angle. The sliding direction of the slide block 5 intersects the mold opening direction perpendicularly. The centerline of the adapter rod 6 and the centerline of the main channel 2 are on opposite sides.

[0039] The fixed base 4 will be fixed to the upper ejector plate, and the fixed base 4 will be driven to move up and down by the upper ejector plate.

[0040] One end of the branch channel 10 is connected to the main channel 2, and the other end of the branch channel 10 is provided with an overflow port, which is connected to the cavity 3. The two ends of the branch channel 10 are of different sizes, with the cross-section of the end of the branch channel 10 closer to the cavity 3 being larger than the cross-section of the end of the branch channel 10 farther from the cavity 3. The cross-section of the solidified material inside the branch channel 10 gradually increases along the direction closer to the cavity 3. The overflow port is located at the upper part of the end of the branch channel 10 closest to the cavity 3. The overflow port keeps the cold front material inside the branch channel 10 and allows the molten material at the normal temperature to overflow into the cavity 3.

[0041] Preferably, the cross-section of the diversion channel 10 gradually expands in the direction away from the main channel 2, and a cold material well is provided in the middle of the diversion channel 10, with a ejector pin inside the cold material well. The ejector pin pushes out the solidified material inside the diversion channel 10.

[0042] The parting surface 11 is a stepped parting surface 11, the bottom of the overflow port is coplanar with the upper end of the parting surface 11, and the distance between the parting surface 11 and the upper surface of the rear mold core 1 increases stepwise in the direction away from the flow channel 10.

[0043] The sliding direction of the slide block 5 forms an acute angle with the center line of the main channel 2.

[0044] The angle between the centerline of the adapter rod 6 and the centerline of the main channel 2 is an acute angle.

[0045] The inner insert 7 has a protruding molding block at the center of its surface away from the adapter rod 6. Multiple insert pins 8 are arranged evenly spaced around the molding block, and the cross-section of the molding block decreases progressively from the center to both ends. The molding block shapes the internal structure of the injection-molded product.

[0046] The inner hole insert 7 has a square protrusion on its surface away from the rear mold core 1. One end of the adapter rod 6 has a positioning groove, and the square protrusion is located inside the positioning groove. The square protrusion is used to position the inner hole insert 7.

[0047] A countersunk hole is provided at the edge of the surface of the inner hole insert 7 that contacts the adapter rod 6. Each insert pin 8 corresponds to a countersunk hole, with one end of the insert pin positioned inside the countersunk hole and abutting against the adapter rod 6. The insert pin 8 passes through the countersunk hole, and a mounting plate at one end of the insert pin 8 is clamped between the inner hole insert 7 and the adapter rod 6. After removing the inner hole insert 7, the insert pin 8 can be pulled out from the countersunk hole for replacement.

[0048] The core-pulling mechanism also includes a first screw and a second screw. The adapter rod 6 has a stepped hole, the cross-section of which decreases progressively towards the inner hole insert 7. One end of the first screw is disposed in the stepped hole, and the other end of the first screw is threaded to the inner hole insert 7. The end of the stepped hole near the slide 5 has an internal thread. One end of the second screw is threaded to the internal thread, and the other end of the second screw is embedded inside the slide 5. The inner hole insert 7 and the adapter rod 6 are detachably connected by the first screw, and the adapter rod 6 and the slide 5 are detachably connected by the second screw, facilitating the replacement of the inner hole insert 7 and the adapter rod 6.

[0049] The upper surface of the slide block 5 has a through groove, and the lower end of the adapter rod 6 is detachably installed inside the through groove by a second screw. The adapter rod 6 is positioned and installed through the through groove.

[0050] In one embodiment, a cold slug well is provided in the middle of the runner 10, and an ejector pin is provided inside the cold slug well. During demolding, the solidified material inside the runner 10 is ejected by the ejector pin.

[0051] Each end of the main runner 2 is connected to a first venting groove and each cavity 3 is connected to a second venting groove. The centerline of the first venting groove is set along the length direction of the rear mold core 1, and the centerline of the second venting groove is set along the width direction of the rear mold core 1. The air inside the runner and cavity 3 is discharged through the first and second venting grooves to avoid air bubbles in the injection molded product.

[0052] The technical features of the embodiments described above can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of this utility model, and these should all be considered to be within the scope of this specification.

Claims

1. A multi-angle inclined core-pulling mechanism, characterized in that: include: The rear mold core has a main channel on its upper surface along its length direction. Multiple cavities are evenly spaced on both sides of the main channel along the length direction of the rear mold core. Several insert grooves are opened on the lower surface of the rear mold core. The insert grooves correspond one-to-one with the middle of the cavity and are connected. The glue-injecting insert is provided in a one-to-one correspondence with the mold cavity. The glue-injecting insert is located between the main flow channel and the mold cavity. The upper surface of the glue-injecting insert is provided with a branch channel and a parting surface in sequence along the direction away from the main flow channel. The cross-section of the branch channel gradually expands along the direction away from the main flow channel. The parting surface is embedded in the mold cavity and located above the bottom of the branch channel groove. The main flow channel, the branch channel and the mold cavity are connected in sequence. The core-pulling mechanism includes a connecting rod, an inner hole insert, a pin, a slide block, and a fixed base. The inner hole insert is slidably disposed inside the insert groove, and the slide block is slidably disposed inside the fixed base. The inner hole insert and the slide block are detachably disposed at the upper and lower ends of the connecting rod, respectively. One end of the pin is disposed at the edge of the inner hole insert. The centerline of the insert groove, the centerline of the inner hole insert, and the centerline of the adapter rod are collinear. The angle between the centerline of the adapter rod and the mold opening direction is an acute angle. The sliding direction of the slide block intersects the mold opening direction perpendicularly. The centerline of the adapter rod and the centerline of the main channel are on opposite planes.

2. The multi-angle inclined core-pulling mechanism according to claim 1, characterized in that: One end of the branch channel is connected to the main channel, and the other end of the branch channel is provided with an overflow port, which is connected to the cavity.

3. The multi-angle inclined core-pulling mechanism according to claim 2, characterized in that: A cold material well is provided in the middle of the distribution channel, and a ejector pin is provided inside the cold material well.

4. The multi-angle inclined core-pulling mechanism according to claim 2, characterized in that: The parting surface is a stepped parting surface, and the bottom of the overflow port is coplanar with the upper end of the parting surface.

5. The multi-angle inclined core-pulling mechanism according to claim 1, characterized in that: The sliding direction of the slide block forms an acute angle with the center line of the main channel.

6. The multi-angle inclined core-pulling mechanism according to claim 1, characterized in that: The angle between the centerline of the adapter rod and the centerline of the main channel is an acute angle.

7. The multi-angle inclined core-pulling mechanism according to claim 1, characterized in that: The inner hole insert has a protruding shaped block at the center of its surface away from the adapter rod. There are multiple insert pins, which are evenly spaced around the shaped block. The cross-section of the shaped block decreases in stages from the middle to both ends.

8. The multi-angle inclined core-pulling mechanism according to claim 1, characterized in that: The inner hole insert has a square protrusion on its surface away from the rear mold core, and one end of the adapter rod has a positioning groove, with the square protrusion located inside the positioning groove.

9. The multi-angle inclined core-pulling mechanism according to claim 1, characterized in that: A countersunk hole is provided at the edge of the surface of the inner hole insert that contacts the adapter rod. The insert pin corresponds to the countersunk hole one by one, and one end of the insert pin is set in the countersunk hole and abuts against the adapter rod.

10. The multi-angle inclined core-pulling mechanism according to claim 1, characterized in that: The core-pulling mechanism also includes a first screw and a second screw. The adapter rod has a stepped hole with a cross-section that decreases progressively towards the inner hole insert. One end of the first screw is located in the stepped hole, and the other end of the first screw is threaded to the inner hole insert. The stepped hole has an internal thread at the end near the slide block. One end of the second screw is threaded to the internal thread, and the other end of the second screw is embedded inside the slide block.

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