A mechanism for back-draft core pulling

Abstract

The utility model relates to the field of injection molding, and discloses a back mold core-pulling mechanism, which comprises an A plate, a B plate, a mold foot, an ejection plate, a sliding seat, a driving element, an array of insert needles, a reset rod and two limiting blocks, the B plate is symmetrically provided with a plurality of cores, the B plate is provided with a sliding groove, the sliding seat is slidingly arranged in the sliding groove, the driving element is clamped between the sliding seat and the B plate, the array of insert needles is detachably arranged on the sliding seat, the array of insert needles comprises a plurality of sub-insert needles, the sub-insert needles sequentially penetrate the B plate and the cores, the reset rod is slidingly arranged on the B plate, the two limiting blocks are respectively arranged at the two ends of the B plate, the middle portions of the two limiting blocks are rotatably connected to the B plate, one end of each limiting block abuts against the sliding seat, and the other end of each limiting block abuts against the reset rod. After the A plate and the B plate of the conventional two-plate mold are opened, the sub-insert needles are first pulled out, the opening stroke of the B plate and the sub-insert needles is different, the space of the B plate is fully utilized, the push plate and the backing plate are cancelled, and the number of mold plates is simplified.

Description

Technical Field

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

[0002] When an injection-molded product has multiple small-diameter through holes, multiple insert pins are required to form these small-diameter through holes. If a two-plate mold structure is used to injection mold this product, the space of the B-plate of the two-plate mold is limited, and the stroke of the insert pins during mold opening is different from that of the B-plate. Therefore, a new rear mold core-pulling mechanism is proposed. Utility Model Content

[0003] The purpose of this invention is to provide a rear mold core-pulling mechanism to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, this utility model adopts the following technical solution: a rear mold core-pulling mechanism, comprising: Board A; B plate, wherein a plurality of cores are symmetrically arranged on B plate; Two mold feet, which are symmetrically fixed to plate B; An ejector plate, which is slidably disposed between two mold feet; The slide block is provided with a groove in plate B, and the slide block is slidably disposed inside the groove. A driving element is sandwiched between the slide block and plate B, and the driving element drives the slide block to slide away from plate B. A pin array is provided, which corresponds one-to-one with the core. The pin array is detachably mounted on the slide. The pin array includes several sub-pins, which sequentially pass through the B plate and the core. A reset rod is slidably mounted on plate B. The direction in which the sub-pin penetrates plate B, the sliding direction of the reset rod, and the sliding direction of the slide block are all parallel to each other. Two limiting blocks are respectively disposed at both ends of plate B. The middle part of the two limiting blocks is rotatably connected to plate B. One end of the limiting block abuts against the slide block, and the other end of the limiting block abuts against the reset rod. When the mold is closed, the two ends of the reset rod abut against the limiting block and plate A, respectively.

[0005] Preferably, the B plate includes a rear template, a rear mold core, and a base plate. The rear template has a groove, and the rear mold core is correspondingly disposed inside the groove. The base plate is sandwiched between the rear mold core and the bottom of the groove. The base plate has a first hole, one end of the core is disposed inside the first hole, and the other end of the core passes through the rear mold core. The axial section of the first hole is T-shaped.

[0006] Preferably, the surface of the limiting block near the mold foot is formed by the connection of a first plane and a second plane, the angle between the first plane and the second plane is an obtuse angle, and the boundary line between the first plane or the second plane abuts against the mold foot.

[0007] Preferably, the rear mold core-pulling mechanism further includes several guide rods, each of which is detachably mounted on the rear mold plate and slidably mounted on the slide block.

[0008] Preferably, the slide block has protruding posts at both ends of its surface away from plate B, the top plate has through holes, the protruding posts are slidably disposed in the through holes one-to-one, and the cross-sections of the protruding posts and the through holes are both regular polygons.

[0009] Preferably, the slide block has a detachable fixing plate on its surface away from the rear mold core, the fixing plate being disposed between two protruding pillars, and the tail of the sub-insertion pin being clamped between the slide block and the fixing plate.

[0010] Preferably, the slide block has receiving grooves at both ends of its surface near plate B, and the driving element is disposed inside the receiving grooves.

[0011] Preferably, the rear mold core-pulling mechanism further includes a sprue insert, the two ends of which are rotatably disposed on the rear mold core and the base plate, respectively. The base plate has a second hole, and the two ends of the sprue insert are rotatably disposed in the rear mold core and the second hole, respectively. The axial section of the second hole is T-shaped.

[0012] Preferably, the ejector plate is rotatably provided with ejector pins, which sequentially pass through the fixing plate, the slide block, the rear template and the sprue insert.

[0013] Preferably, the driving element is a compression spring or a nitrogen spring.

[0014] The beneficial effects of this utility model are as follows: When the mold is opened, the support force of plate A on the reset rod is removed, causing the drive element to drive the slide to open the mold, realizing the core pulling function of the sub-insert. When the slide slides, it drives the limit block to rotate, and the other end of the limit block drives the reset rod to rise and push open plate A and plate B, so that plate A and plate B reach the mold opening position, and the sub-insert retracts into the core. When the mold is closed, the A plate drives the reset rod to reset, and the reset rod drives the limit block to rotate and reset, realizing the core pulling function of the sub-insert. When the slide slides, it drives the limit block to rotate, and one end of the limit block drives the slide to rise to the mold closing position, and the sub-insert extends out of the core.

[0015] The stroke of the slide block and the sub-pin is controlled by a limit block, and the stroke of plate B is controlled by an ejector plate. This allows the sub-pin and plate B to have different strokes. When the mold opens, the sub-pin retracts into the core, and when the mold closes, the sub-pin extends out of the core. This achieves the function of the sub-pin pulling out first after the A and B plates of a conventional two-plate mold open, and makes full use of the space of plate B, eliminating the need for push plates and backing plates, thus simplifying the number of mold templates. Attached Figure Description

[0016] The accompanying drawings further illustrate the present invention, but the embodiments in the drawings do not constitute any limitation on the present invention.

[0017] Figure 1 A cross-sectional view of a rear mold core-pulling mechanism provided in an embodiment of this utility model; Figure 2 A cross-sectional view of plate B provided in an embodiment of this utility model; Figure 3 This is a schematic diagram of the structure of a rear mold core-pulling mechanism provided in an embodiment of the present invention; Markings in the diagram: 1: Plate A; 2: Plate B; 3: Rear template; 4: Rear mold core; 5: Base plate; 6: Mold foot; 7: Ejector plate; 8: Slide block; 9: Protrusion; 10: Drive element; 11: Sub-insert; 12: Reset rod; 13: Limit block; 14: Guide rod; 15: Fixing plate; 16: Core; 17: Sprue insert; 18: Ejector pin. Detailed Implementation

[0018] 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.

[0019] 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. "Inner" and "outer" refer to the inner and outer contours of a specific part. "Far" and "near" refer to the far and near relative to a certain component.

[0020] like Figures 1-3 As shown in the figure, an embodiment of the present invention provides a rear mold core-pulling mechanism, comprising: Board A1; B plate 2, wherein a plurality of cores 16 are symmetrically provided on B plate 2; Two mold feet 6 are symmetrically fixed to plate B 2; Ejector plate 7, which is slidably disposed between two mold feet 6; The slide block 8 is provided with a groove in the B plate 2, and the slide block 8 is slidably disposed inside the groove. A driving element 10 is sandwiched between the slide block 8 and the B plate 2, and the driving element 10 drives the slide block 8 to slide away from the B plate 2. A pin array is provided in a one-to-one correspondence with the core 16. The pin array is detachably mounted on the slide 8. The pin array includes a plurality of sub-pins 11, which pass through the B plate 2 and the core 16 in sequence. Two reset rods 12 are slidably disposed on plate B 2. The direction in which the sub-pin 11 penetrates plate B 2, the sliding direction of the reset rods 12, and the sliding direction of the slide block 8 are all parallel to each other. Two limiting blocks 13 are respectively disposed at both ends of plate B 2. The middle part of the two limiting blocks 13 is rotatably connected to plate B 2 through a rotating shaft. One end of the limiting block 13 away from the surface of the ejector plate 7 abuts against the slide block 8, and the other end of the limiting block 13 away from the surface of the ejector plate 7 abuts against the reset rod 12. The A plate 1 is provided with a plurality of pads, and the pads are arranged in a one-to-one correspondence with the reset rod 12; When the mold is closed, the two ends of the reset rod 12 abut against the limiting block 13 and the pad block, respectively.

[0021] The B plate 2 includes a rear template 3, a rear mold core 4, and a base plate 5. The rear template 3 has a groove, and the rear mold core 4 is correspondingly disposed inside the groove. The base plate 5 is sandwiched between the rear mold core 4 and the bottom of the groove. The base plate 5 has a first hole, and one end of the core 16 is disposed inside the first hole, while the other end of the core 16 passes through the rear mold core 4. The axial section of the first hole is T-shaped. The core 16 is fixed by the rear mold core 4 and the base plate 5, allowing the core 16 to be disassembled and replaced.

[0022] The surface of the limiting block 13 near the mold foot 6 is formed by the connection of a first plane and a second plane. The angle between the first plane and the second plane is an obtuse angle. The boundary line between the first plane and the second plane abuts against the mold foot 6. The first plane and the second plane are connected sequentially along the direction close to the slide block 8. The first plane and the second plane are configured as follows: When plate A1 and plate B2 are in the mold opening position, the plane containing the first plane intersects the mold opening direction at an inclination, the plane containing the second plane is perpendicular to the mold opening direction, and the second plane is in contact with the mold foot 6. When plate A1 and plate B2 are in the mold closing position, the plane containing the first plane is perpendicular to the mold opening direction, the plane containing the second plane intersects the mold opening direction at an angle, and the first plane is in contact with the mold foot 6.

[0023] The rotation angle of the limiting block 13 is restricted by the first plane and the second plane, thereby limiting the displacement distance of the slide block 8, ensuring that the stroke of the slide block 8 is different from the stroke of the B plate 2, so that the sub-pin 11 retracts into the core 16 when the mold is opened.

[0024] The rear mold core-pulling mechanism also includes several guide rods 14, each of which is detachably mounted on the rear template 3 and slidably mounted on the slide block 8. By installing the guide rods 14 on the rear template 3, the slide block 8 is guided, ensuring that it slides linearly during mold opening and closing. The sprue insert 17, in cooperation with the guide rods 14, prevents the sub-insert 11 from wobbling during mold opening and closing.

[0025] Both ends of the slide block 8 away from the surface of plate B 2 are provided with protrusions 9. The ejector plate 7 has through holes, and the protrusions 9 are slidably disposed in the through holes one-to-one. The cross-sections of the protrusions 9 and the through holes are both regular polygons. The protrusions 9 slide in contact with the through holes on the ejector plate 7. Since the mold opening stroke of plate B 2 is different from that of the slide block 8, when the slide block 8 stops its mold opening movement, the ejector plate 7 is still in the mold opening movement. The protrusions 9 guide the ejector plate 7 and the slide block 8 to ensure linear movement of the ejector plate 7 and the slide block 8 during mold opening and closing.

[0026] The slide block 8, away from the rear mold core 4, is detachably fitted with a fixing plate 15 via screws. The fixing plate 15 is positioned between two protruding pillars 9, and the tail of the sub-pin 11 is clamped between the slide block 8 and the fixing plate 15. The fixing plate 15 is detachably installed on the slide block 8, and the sub-pin 11 can be replaced after the fixing plate 15 is removed.

[0027] The slide block 8 has receiving grooves at both ends of its surface near plate B 2, and the driving element 10 is disposed inside the receiving grooves. The receiving grooves position the driving element 10, ensuring that the elastic force applied by the driving element 10 to the slide block 8 is parallel to the sliding direction of the slide block 8.

[0028] The rear mold core-pulling mechanism also includes a sprue insert 17. The sprue insert 17 is rotatably mounted at both ends on the rear mold core 4 and the base plate 5, respectively. The base plate 5 has a second hole, and the sprue insert 17 is rotatably mounted at both ends on the rear mold core 4 and within the second hole. The second hole has a T-shaped cross-section. One end of the sprue insert 17 has a T-shaped runner for connecting the core 16 and the main runner. When the sprue insert 17 is rotated, it controls whether the two opposing cores 16 are connected to the runner on plate B 2.

[0029] The ejector plate 7 is rotatably equipped with ejector pins 18, which sequentially pass through the fixed plate 15, the slide block 8, the rear template 3, and the sprue insert 17. The sprue insert 17 and the ejector pin 18 cooperate to limit the mold opening direction of the ejector plate 7, the slide block 8, and the B plate 2, ensuring that the mold opening direction of the ejector plate 7, the slide block 8, and the B plate 2 is parallel to the center line of the ejector pin 18.

[0030] The driving element 10 is a compression spring or a nitrogen spring. The driving element 10 applies a spring force to the slide block 8 and the B plate 2, driving the slide block 8 to move away from the B plate 2.

[0031] When A plate 1 and B plate 2 are opened, the support force of the pad block on A plate 1 on the reset rod 12 is removed, causing the drive element 10 to push the slide 8 to move away from A plate 1. The sub-pin 11 follows the movement of the slide 8 to realize the core pulling function. At the same time, the slide 8 will drive the end of the limit block 13 near the slide 8 to move away from A plate 1. The end of the limit block 13 away from the slide 8 will tilt up towards A plate 1. When the end of the limit block 13 away from the slide 8 tilts up, it will drive the reset rod 12 to extend out of B plate 2. The reset rod 12 will push open A plate 1 and B plate 2, so that A plate 1 and B plate 2 reach the mold opening position. When plate A1 and plate B2 are closed, the pad on plate A1 applies pressure to the reset rod 12, causing the end of the reset rod 12 away from the slide 8 to move away from plate A1, and the end of the reset rod 12 near the slide 8 to move towards plate A1, driving the limit block 13 to rotate around the axis. The end of the reset rod 12 near the slide 8 drives the slide 8 to reset, and the sub-pin 11 will extend out of the core 16 to achieve the reset function.

[0032] 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 rear mold core-pulling mechanism, characterized in that: include: Board A; B plate, wherein a plurality of cores are symmetrically arranged on B plate; Two mold feet, which are symmetrically fixed to plate B; An ejector plate, which is slidably disposed between two mold feet; The slide block is provided with a groove in plate B, and the slide block is slidably disposed inside the groove. A driving element is sandwiched between the slide block and plate B, and the driving element drives the slide block to slide away from plate B. A pin array is provided, which corresponds one-to-one with the core. The pin array is detachably mounted on the slide. The pin array includes several sub-pins, which sequentially pass through the B plate and the core. A reset rod is slidably mounted on plate B. The direction in which the sub-pin penetrates plate B, the sliding direction of the reset rod, and the sliding direction of the slide block are all parallel to each other. Two limiting blocks are respectively disposed at both ends of plate B. The middle part of the two limiting blocks is rotatably connected to plate B. One end of the limiting block abuts against the slide block, and the other end of the limiting block abuts against the reset rod. When the mold is closed, the two ends of the reset rod abut against the limiting block and plate A, respectively.

2. The rear mold core-pulling mechanism according to claim 1, characterized in that: The B plate includes a rear template, a rear mold core, and a base plate. The rear template has a groove, and the rear mold core is correspondingly disposed inside the groove. The base plate is sandwiched between the rear mold core and the bottom of the groove. The base plate has a first hole, one end of the core is disposed inside the first hole, and the other end of the core passes through the rear mold core. The axial section of the first hole is T-shaped.

3. The rear mold core-pulling mechanism according to claim 1, characterized in that: The surface of the limiting block near the mold foot is formed by the connection of a first plane and a second plane, the angle between the first plane and the second plane is an obtuse angle, and the boundary line between the first plane or the second plane abuts against the mold foot.

4. The rear mold core-pulling mechanism according to claim 2, characterized in that: The rear mold core-pulling mechanism also includes several guide rods, each of which is detachably mounted on the rear mold plate and is slidably mounted on the slide block.

5. The rear mold core-pulling mechanism according to claim 2, characterized in that: The slide block has protruding posts at both ends of its surface away from plate B. The top plate has through holes, and the protruding posts are slidably disposed in the through holes one by one. The cross-sections of the protruding posts and the through holes are both regular polygons.

6. The rear mold core-pulling mechanism according to claim 5, characterized in that: The slide block is detachably provided with a fixing plate on the surface away from the rear mold core. The fixing plate is located between two protruding pillars, and the tail of the sub-pin is clamped between the slide block and the fixing plate.

7. The rear mold core-pulling mechanism according to claim 1, characterized in that: The slide block has receiving grooves at both ends of its surface near plate B, and the driving element is disposed inside the receiving grooves.

8. The rear mold core-pulling mechanism according to claim 6, characterized in that: The rear mold core-pulling mechanism also includes a sprue insert, the two ends of which are rotatably disposed on the rear mold core and the base plate, respectively. The base plate has a second hole, and the two ends of the sprue insert are rotatably disposed in the rear mold core and the second hole, respectively. The axial section of the second hole is T-shaped.

9. The rear mold core-pulling mechanism according to claim 8, characterized in that: The ejector plate is rotatably equipped with ejector pins, which sequentially pass through the fixing plate, the slide block, the rear template, and the sprue insert.

10. The rear mold core-pulling mechanism according to claim 1, characterized in that: The driving element is a compression spring or a nitrogen spring.

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