Flaring inner ring groove mold core structure

Abstract

The utility model belongs to the technical field of dies, and particularly relates to a flaring inner ring groove die core structure which comprises a core outer sleeve and a sliding seat, a first rotating block and a second rotating block are alternately arranged on the periphery of the head of the sliding seat, and an annular groove is formed in the inner side wall of the core outer sleeve. Protruding blocks assembled in the annular grooves are arranged on the peripheries of the first rotating block and the second rotating block respectively, a push rod is arranged in the sliding seat, the outer end of the push rod extends out of the sliding seat, and when the sliding seat moves towards the tail, the outer end of the push rod drives the head of the second rotating block to rotate towards the inner side with the corresponding protruding block as a fulcrum. The head part of the first rotating block is pushed by the tail part of the second rotating block to rotate towards the inner side by taking the corresponding convex block as a fulcrum; when the sliding seat moves towards the head, the head of the first rotating block and the head of the second rotating block are pushed to rotate towards the outer side with the corresponding protruding blocks as fulcrums respectively. The head of the first rotating block and the head of the second rotating block are not prone to abrasion, so that the phenomenon of material running and flying is avoided, and the product quality is good.

Description

Technical field:

[0001] The utility model belongs to the technical field of molds, in particular to a core structure of an expanding inner ring groove mold. Background technology:

[0002] When using plastic molds to produce plastic products, such as plastic pipe fittings, especially expanded pipe fittings, the expanded part must first be cored out and demoulded before the mold ejection mechanism can eject the expanded pipe fitting body out of the mold.

[0003] A Chinese invention patent (publication number CN102241119A, application date 2011.06.24, publication date 2011.11.16) discloses a core pulling mechanism for an injection mold for a flared pipe fitting, comprising a fixed mold base plate and a movable mold base plate, the fixed mold base plate is connected to the fixed mold plate, a mold foot is installed on the movable mold base plate, an ejector plate and an ejector plate are arranged in the mold foot, an ejector is connected to the ejector plate, a movable mold plate is installed on the mold foot, a formed flared pipe fitting is arranged between the movable mold plate and the fixed mold plate, an I-shaped block is installed on one side of the movable mold base plate, a slider is arranged on the I-shaped block, an flared slider octahedron is arranged in the slider, and the flared slider octahedron Four large expansion sliders and four small expansion sliders are cross-arranged at the head of the face body, wherein the large expansion slider contacts the oblique dovetail groove of the head of the expansion slider octahedron, the small expansion slider contacts the head plane of the expansion slider octahedron, the large expansion slider and the small expansion slider are combined with each other to cooperate with the expansion of the expansion pipe fitting, a connecting rod is arranged in the octahedron of the expansion slider, the head of the connecting rod is connected to the slider core, the slider core cooperates with the inner wall of the expansion pipe fitting, the tail of the connecting rod is connected to the core-pulling cylinder, an oblique slide groove is formed in the middle of the expansion slider octahedron, a locking bent pin is connected under the fixed template, and the locking bent pin cooperates with the oblique slide groove. When pulling the core, the dynamic template and the fixed template are first driven by the power of the injection molding machine to open the mold. When opening the mold, the locking bent pin under the fixed template cooperates with the oblique slide groove of the octahedron of the expanding slider, driving the octahedron of the expanding slider to slide outward. Since the large expanding slider and the head of the octahedron of the expanding slider are in contact with the oblique dovetail groove, the outward sliding of the octahedron of the expanding slider is equivalent to the large expanding slider sliding down along the oblique dovetail groove (radial contraction). When the large expanding slider slides down, the large expanding slider and the small expanding slider are cross-arranged with each other, thereby forcing the small expanding slider to slide down (contract) at the same time, so that the large expanding slider and the small expanding slider are demolded from the expanding part of the expanding pipe fitting. At this time, the mold opening is completed, and the demolding of the expanding part of the expanding pipe fitting is completed, but the slider core is still in the inner wall of the expanding pipe fitting, so the core pulling cylinder drives the connecting rod to pull the slider core from the inner wall of the expanding pipe fitting. At this point, the core pulling of the expanding pipe fitting is completed, and finally the expanding pipe fitting is ejected out of the mold by the ejection mechanism, and the demolding is completed. The locking bent pin of this solution has the functions of locking the mold (locking the slider when closing the mold) and core pulling (making the octahedron of the expanded slide slide and pull the core when opening the mold), which reduces power and saves costs. The expanded large slide contacts the octahedron dovetail groove of the expanded slide, has good sliding balance, and demoulding is smooth.

[0004] The disadvantages of the core-pulling mechanism of the above-mentioned flaring pipe fitting injection mold are as follows: The small flaring slider realizes simultaneous downward sliding and contraction by being pressed by the large flaring slider. With such a setting, the small flaring slider and the large flaring slider are prone to wear, and then the material will overflow into the worn part, resulting in the phenomenon of material leakage and flying, which affects the quality of the product. Summary of the Invention:

[0005] The purpose of the present utility model is to provide a core structure for a flaring inner ring groove mold, in which the heads of the first rotating block and the second rotating block are not easily worn, so that the phenomenon of material leakage and flying will not occur, and the quality of the product is good.

[0006] The present utility model is realized as follows:

[0007] A core structure for a flaring inner ring groove mold includes a core outer sleeve and a sliding seat axially slidably arranged in the core outer sleeve with a conical head. Alternately arranged on the outer periphery of the head of the sliding seat are a first rotating block and a second rotating block. The first rotating block is large on the outside and small on the inside, and the second rotating block is small on the outside and large on the inside. The first rotating block and the second rotating block jointly form an annular structure. An annular groove is provided on the inner side wall of the core outer sleeve. Protrusions assembled in the annular groove are respectively provided on the outer peripheries of the first rotating block and the second rotating block. A push rod with a position and quantity adapted to the second rotating block is arranged in the sliding seat. The outer end of the push rod extends out of the sliding seat. When the sliding seat moves towards the tail direction, the outer end of the push rod drives the head of the second rotating block to rotate inwards with the corresponding protrusion as a fulcrum, and the head of the first rotating block rotates inwards with the corresponding protrusion as a fulcrum under the push of the tail of the second rotating block; when the sliding seat moves towards the head direction, it pushes the heads of the first rotating block and the second rotating block to rotate outwards with the corresponding protrusions as fulcrums respectively.

[0008] In the above-mentioned core structure for a flaring inner ring groove mold, a long strip-shaped groove is concavely formed in the inner side wall of the second rotating block, and the length direction of the long strip-shaped groove is arranged along the axial direction of the second rotating block. An inclined groove with a gradually decreasing depth is provided at the tail of the long strip-shaped groove. During the process of the sliding seat moving towards the tail direction, when the outer end of the push rod moves from the long strip-shaped groove to the inclined groove, the outer end of the push rod abuts against the inclined groove and pushes the second rotating block to rotate.

[0009] In the above-mentioned core structure for a flaring inner ring groove mold, the outer end of the push rod is hemispherical, and the bottom of the long strip-shaped groove is a cylindrical surface adapted to the hemispherical shape.

[0010] In the above-mentioned core structure for a flaring inner ring groove mold, a groove with a bottom adapted to the hemispherical shape is provided at the head of the long strip-shaped groove.

[0011] In the above-mentioned core structure for a flaring inner ring groove mold, the end surface of the protrusion on the side close to the head of the second rotating block is a conical surface, and the diameter of the conical surface gradually increases from the side close to the head of the second rotating block towards the tail side.

[0012] In the above-mentioned core structure of the flaring inner ring groove mold, an arc surface is provided for transition between the round table surface and the outer side surface of the convex block.

[0013] In the above-mentioned core structure of the flaring inner ring groove mold, an annular notch for avoiding the tails of the first rotating block and the second rotating block is provided on the inner side wall of the core outer sleeve.

[0014] In the above-mentioned core structure of the flaring inner ring groove mold, a connecting rod is slidably arranged in the sliding seat. The head of the connecting rod extends out of the sliding seat to connect the slider core, and the tail extends out of the sliding seat to connect the core pulling oil cylinder. A through hole adapted to the push rod is provided on the side wall of the sliding seat, and the inner end of the push rod abuts against the connecting rod.

[0015] In the above-mentioned core structure of the flaring inner ring groove mold, the two side walls of the first rotating block in contact with the second rotating block are inclined surfaces that gradually incline from the outside to the middle, and the two side walls of the second rotating block in contact with the first rotating block are inclined surfaces that gradually incline from the inside to the outside and towards the middle.

[0016] The outstanding advantages of the present utility model compared with the prior art are:

[0017] 1. The head of the first rotating block of the present utility model rotates inwards under the thrust of the tail of the second rotating block. There is no force acting between the head of the first rotating block and the head of the second rotating block, and the two heads are not easily worn, so that the phenomenon of material running and flying will not occur, and the quality of the product is good.

[0018] 2. The inner side wall of the second rotating block of the present utility model is concaved to form a long strip-shaped groove. The length direction of the long strip-shaped groove is arranged along the axial direction of the second rotating block. An inclined groove with gradually decreasing depth is provided at the tail of the long strip-shaped groove. When the outer end of the push rod moves from the long strip-shaped groove to the inclined groove during the movement of the sliding seat towards the tail direction, the outer end of the push rod abuts against the inclined groove to push the second rotating block to rotate. The structure is simple, easy to install, and the implementation effect is good. Description of the drawings:

[0019] Figure 1 It is a three-dimensional view of the present utility model in a state where the rotating block does not rotate inwards and there is no connecting rod;

[0020] Figure 2 It is a cross-sectional view of the present utility model in a state where the rotating block does not rotate inwards and there is no connecting rod;

[0021] Figure 3 It is a three-dimensional view of the present utility model in a state where the rotating block rotates inwards and there is no slider core;

[0022] Figure 4 It is a cross-sectional view of the present utility model in a state where the rotating block rotates inwards and there is no slider core;

[0023] Figure 5It is an exploded view of the core of the utility model without a connecting rod and a slider core.

[0024] Reference numerals: 1, core outer sleeve; 2, sliding seat; 3, first rotating block; 4, second rotating block; 5, annular groove; 6, convex block; 7, push rod; 8, long strip groove; 9, inclined groove; 10, groove; 11, round table surface; 12, arc surface; 13, annular notch; 14, connecting rod; 15, slider core. Specific embodiments:

[0025] The following further describes the present utility model with specific embodiments. Refer to Figure 1 —5:

[0026] A core structure of a flaring inner ring groove mold includes a core outer sleeve 1 and a sliding seat 2 slid axially in the core outer sleeve 1 with a tapered head. The outer periphery of the head of the sliding seat 2 is alternately provided with a first rotating block 3 and a second rotating block 4. The first rotating block 3 is large on the outside and small on the inside, and the second rotating block 4 is small on the outside and large on the inside. The first rotating block 3 and the second rotating block 4 together form an annular structure. An annular groove 5 is provided on the inner side wall of the core outer sleeve 1. Convex blocks 6 assembled in the annular groove 5 are respectively provided on the outer peripheries of the first rotating block 3 and the second rotating block 4. A push rod 7 is provided in the sliding seat 2 with a position and a number adapted to the second rotating block 4. The outer end of the push rod 7 extends out of the sliding seat 2. When the sliding seat 2 moves towards the tail direction, the outer end of the push rod 7 drives the head of the second rotating block 4 to rotate inwards with the corresponding convex block 6 as a fulcrum, and the head of the first rotating block 3 rotates inwards with the corresponding convex block 6 as a fulcrum under the push of the tail of the second rotating block 4; when the sliding seat 2 moves towards the head direction, the heads of the first rotating block 3 and the second rotating block 4 are respectively pushed to rotate outwards with the corresponding convex blocks 6 as fulcrums.

[0027] The working principle of the present utility model: As Figures 1-5 shown, when the sliding seat 2 moves towards the tail direction, the outer end of the push rod 7 drives the head of the second rotating block 4 to rotate inwards with the corresponding convex block 6 as a fulcrum, then the tail of the second rotating block 4 rotates outwards with the corresponding convex block 6 as a fulcrum and pushes the tail of the first rotating block 3 to rotate outwards with the corresponding convex block 6 as a fulcrum, and the head of the first rotating block 3 rotates inwards with the corresponding convex block 6 as a fulcrum, realizing the inward rotation of the heads of the second rotating block 4 and the first rotating block 3; when the sliding seat 2 moves towards the head direction, the heads of the first rotating block 3 and the second rotating block 4 are respectively pushed to rotate outwards with the corresponding convex blocks 6 as fulcrums, realizing the reset of the first rotating block 3 and the second rotating block 4.

[0028] The flaring part of the flared pipe fitting is at the heads of the first rotating block 3 and the second rotating block 4, and has nothing to do with the tails of the first rotating block 3 and the second rotating block 4.

[0029] The first rotating block 3 of the present utility model rotates inward at its head through the thrust at the tail of the second rotating block 4. There is no force acting between the heads of the first rotating block 3 and the second rotating block 3, and the heads of both are not easily worn, so the phenomenon of material running and flying will not occur, and the quality of the product is good. At the same time, the movements of the first rotating block 3 and the second rotating block 4 of the present utility model are rotations rather than slides, and the wear between the two is small.

[0030] The pushing structure of the push rod 7 and the second rotating block 4: As Figure 2 , 4 , shown in 5, a long strip-shaped groove 8 is concavely formed on the inner side wall of the second rotating block 4. The length direction of the long strip-shaped groove 8 is arranged along the axial direction of the second rotating block 4. An inclined groove 9 with a gradually decreasing depth is provided at the tail of the long strip-shaped groove 8. During the process of the slide seat 2 moving towards the tail direction, when the outer end of the push rod 7 moves from the long strip-shaped groove 8 to the inclined groove 9, the outer end of the push rod 7 abuts against the inclined groove 9 to push the second rotating block 4 to rotate. The structure is simple, convenient for installation, and the implementation effect is good.

[0031] In order to facilitate the push rod 7 to drive the second rotating block 4 to rotate, as Figure 2 , 4 , shown in 5, the outer end of the push rod 7 is hemispherical, and the bottom of the long strip-shaped groove 8 is a cylindrical surface adapted to the hemispherical shape.

[0032] Furthermore, a groove 10 with a bottom adapted to the hemispherical shape is provided at the head of the long strip-shaped groove 8.

[0033] In order for the first rotating block 3 and the second rotating block 4 to rotate smoothly, the end face of the convex block 6 on the side close to the head of the second rotating block 4 is a conical surface 11, and the diameter of the conical surface 11 gradually increases from the side close to the head of the second rotating block 4 to the tail side.

[0034] In order to further ensure that the first rotating block 3 and the second rotating block 4 can rotate smoothly, the conical surface 11 and the outer side surface of the convex block 6 are transitioned through an arc surface 12.

[0035] In order to prevent the core mold outer sleeve 1 from affecting the rotation of the first rotating block 3 and the second rotating block 4, an annular notch 13 for avoiding the tails of the first rotating block 3 and the second rotating block 4 is provided on the inner side wall of the core mold outer sleeve 1.

[0036] The installation structure of the push rod 7: As Figure 2 , 4 , shown, a connecting rod 14 is slidably arranged in the slide seat 2. The head of the connecting rod 14 extends out of the slide seat 2 to connect the slider core 15, and the tail extends out of the slide seat 2 to connect the core pulling oil cylinder. A through hole adapted to the push rod 7 is provided on the side wall of the slide seat 2. The inner end of the push rod 7 abuts against the connecting rod 14. The structure is simple, convenient for processing and installation.

[0037] Specific structures of the first rotating block 3 and the second rotating block 4: The two side walls of the first rotating block 3 in contact with the second rotating block 4 are inclined surfaces that gradually incline from the outside to the middle, and the two side walls of the second rotating block 4 in contact with the first rotating block 3 are inclined surfaces that gradually incline from the inside to the outside and then to the middle.

[0038] In this embodiment, one end close to the slider core 15 is the head, and the end far from the slider core 15 is the tail.

[0039] The above embodiments are only one of the preferred embodiments of the present invention, and do not limit the scope of implementation of the present invention. Therefore, all equivalent changes made according to the shape, structure, and principle of the present invention should be covered within the protection scope of the present invention.

Claims

1. A core structure of a flaring inner ring groove mold, characterized in that: It includes a core outer sleeve (1) and a sliding seat (2) that is axially slidably arranged within the core outer sleeve (1) and has a conical head. Alternately arranged on the outer periphery of the head of the sliding seat (2) are a first rotating block (3) and a second rotating block (4). The first rotating block (3) is large on the outside and small on the inside, and the second rotating block (4) is small on the outside and large on the inside. The first rotating block (3) and the second rotating block (4) together form an annular structure. An annular groove (5) is provided on the inner sidewall of the core outer sleeve (1). Protrusions (6) that are respectively assembled within the annular groove (5) are provided on the outer peripheries of the first rotating block (3) and the second rotating block (4). A push rod (7) whose position and quantity are adapted to the second rotating block (4) is arranged within the sliding seat (2). The outer end of the push rod (7) extends out of the sliding seat (2). When the sliding seat (2) moves towards the tail direction, the outer end of the push rod (7) drives the head of the second rotating block (4) to rotate inwards with the corresponding protrusion (6) as the fulcrum, and the head of the first rotating block (3) rotates inwards with the corresponding protrusion (6) as the fulcrum under the push of the tail of the second rotating block (4). When the sliding seat (2) moves towards the head direction, it pushes the heads of the first rotating block (3) and the second rotating block (4) to rotate outwards with the corresponding protrusions (6) as the fulcrums.

2. The core structure of a flaring inner ring groove die according to claim 1, characterized in that: A long strip-shaped groove (8) is concavely formed within the inner sidewall of the second rotating block (4). The length direction of the long strip-shaped groove (8) is arranged along the axial direction of the second rotating block (4). An inclined groove (9) with a gradually decreasing depth is provided at the tail of the long strip-shaped groove (8). During the process of the sliding seat (2) moving towards the tail direction, when the outer end of the push rod (7) moves from the long strip-shaped groove (8) to the inclined groove (9), the outer end of the push rod (7) abuts against the inclined groove (9) and pushes the second rotating block (4) to rotate.

3. The core structure of a flaring inner ring groove mold according to claim 2, characterized in that: The outer end of the push rod (7) is hemispherical, and the bottom of the long strip-shaped groove (8) is a cylindrical surface adapted to the hemispherical shape.

4. A core structure of a flaring inner ring groove mold according to claim 3, characterized in that: A groove (10) whose bottom is adapted to the hemispherical shape is provided at the head of the long strip-shaped groove (8).

5. The core structure of a flaring inner ring groove die according to claim 1, characterized in that: The end face of the protrusion (6) on the side close to the head of the second rotating block (4) is a conical surface (11), and the diameter of the conical surface (11) gradually increases from the side close to the head of the second rotating block (4) towards the tail side.

6. The core structure of a flaring inner ring groove mold according to claim 5, characterized in that: The conical surface (11) and the outer side surface of the protrusion (6) are transitioned through an arc surface (12).

7. The core structure of a flaring inner ring groove mold according to claim 1, characterized in that: An annular notch (13) for avoiding the tails of the first rotating block (3) and the second rotating block (4) is provided on the inner sidewall of the core outer sleeve (1).

8. A core structure of a flaring inner ring groove mold according to claim 1, characterized in that: A connecting rod (14) is slidably arranged within the sliding seat (2). The head of the connecting rod (14) extends out of the sliding seat (2) to connect a slider core (15), and the tail extends out of the sliding seat (2) to connect a core pulling oil cylinder. A through hole adapted to the push rod (7) is provided on the sidewall of the sliding seat (2). The inner end of the push rod (7) abuts against the connecting rod (14).

9. The core structure of a flaring inner ring groove mold according to claim 1, characterized in that: The two sidewalls of the first rotating block (3) in contact with the second rotating block (4) are inclined surfaces that gradually incline towards the middle from the outside to the inside, and the two sidewalls of the second rotating block (4) in contact with the first rotating block (3) are inclined surfaces that gradually incline towards the middle from the inside to the outside.

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