Internal thread core-pulling demolding structure for injection mold and injection mold

Abstract

The invention relates to an internal thread core-pulling demolding structure for an injection mold and the injection mold. The structure comprises a core-pulling insert, an inner pipe and a sleeve, a thread is arranged at the first end of the core-pulling insert; the first end of the core-pulling insert is also provided with a plurality of sections of first moving parts which are used for dividing screw teeth along the axial direction and are arranged in a circumferential array, and a section of second moving part is formed between any two sections of adjacent first moving parts; in an initial state, the multiple sections of second moving parts draw close inwards and are distributed with the multiple sections of first moving parts in a staggered manner; the inner pipe is arranged in the core-pulling insert in a penetrating manner, and when the inner pipe is moved to be close to the direction where the threads are located, the multiple sections of second moving parts are pushed and extruded to gradually expand outwards and are spliced with the multiple sections of first moving parts; the sleeve is arranged outside the core-pulling insert in a sleeving manner, and when the inner pipe does not push and extrude the multiple sections of second moving parts and moves the sleeve to approach the direction where the threads are located, the multiple sections of first moving parts are extruded to gradually approach inwards; and smooth demolding of the internal thread product is facilitated, operation is convenient and accurate, and the demolding quality and efficiency are effectively improved.

Description

Technical Field

[0001] The present application relates to the technical field of injection molding and demoulding, and more specifically, to an internal thread core pulling and demoulding structure for an injection mold and an injection mold. Background Art

[0002] In the prior art, common solutions for achieving demoulding of internal threaded products include, for example, using a motor to drive a chain or a cylinder to pull a rack, and then using the chain or rack to drive the gear to rotate, and finally using the gear to drive the connecting rod to rotate to achieve demoulding. Both of these existing solutions have the advantages of fast rotation and fast demoulding. However, since the chain or rack transmission is prone to wear and has a certain amount of sliding, a strict transmission ratio cannot be guaranteed, which will lead to inaccurate power transmission, thereby affecting the precision of demoulding, poor demoulding quality, and low actual demoulding efficiency. Moreover, both of these existing solutions require a large installation space, which will impose certain restrictions on the overall structural design of the injection mold and increase the complexity of the design.

[0003] Application Contents

[0004] The technical problem to be solved by the present application is to provide an internal thread core pulling and demoulding structure for an injection mold and an injection mold in view of the above-mentioned defects of the prior art.

[0005] The technical solution adopted by this application to solve its technical problem is:

[0006] On the one hand, the present application provides an internal thread core-pulling demolding structure for an injection mold, comprising a core-pulling insert, an inner tube and a sleeve; the interior of the core-pulling insert is hollow, and the outer peripheral side surface of the first end of the core-pulling insert is provided with screw threads; the first end of the core-pulling insert also has multiple sections of first movable parts that divide the screw threads along its axial direction and are in a circular array, and a section of second movable part is formed between any two adjacent first movable parts; in the initial state, the multiple sections of the second movable parts all move inwardly and are staggered with the multiple sections of the first movable parts; the inner tube is inserted into the core-pulling insert, and when the inner tube is moved toward the direction where the screw threads are located, the multiple sections of the second movable parts are pushed and gradually expand outwardly and are spliced ​​with the multiple sections of the first movable parts; the sleeve is sleeved outside the core-pulling insert, and when the inner tube does not push the multiple sections of the second movable parts and the sleeve is moved toward the direction where the screw threads are located, the multiple sections of the first movable parts are squeezed and gradually move inwardly.

[0007] In some embodiments, a receiving groove is provided on the inner wall of any second movable part, and a spring and a movable block are provided in the receiving groove; the first end of the spring is fixedly provided on the inner wall of the receiving groove, the first end of the movable block is fixedly connected to the second end of the spring, and the second end of the movable block is located outside the receiving groove; the inner tube is provided with a positioning groove surrounding its outer circumferential side surface, and the second end of the movable block is also provided with a positioning portion for fitting into the positioning groove.

[0008] In some embodiments, the positioning groove has a first inclined surface and a second inclined surface relatively distributed up and down, and the first inclined surface and the second inclined surface are respectively provided with a number of equally spaced longitudinally distributed card blocks; the positioning portion has a third inclined surface that fits with the first inclined surface and a fourth inclined surface that fits with the second inclined surface, and the third inclined surface and the fourth inclined surface are respectively provided with a number of equally spaced card slots for the corresponding card blocks to fit into.

[0009] In some embodiments, a depression surrounding the outer peripheral side of the core-pulling insert is provided in the middle of the outer periphery, and the side of the multiple-segment first movable part and the multiple-segment second movable part away from the screw thread both extend to the depression.

[0010] In some embodiments, a gap is provided between any of the first moving parts and any of the adjacent second moving parts at the recessed portion.

[0011] In some embodiments, the inner tube is a solid structure; the first end of the inner tube is on the same side as the first end of the core-pulling insert, and a groove is provided on the end surface of the first end of the inner tube.

[0012] In some embodiments, the inner tube includes a first tube segment, a second tube segment, a third tube segment and a fourth tube segment which are integrally connected and formed in sequence from top to bottom; the positioning groove is arranged on the outer peripheral side of the first tube segment.

[0013] In some embodiments, the diameter of the first pipe segment is the same as the diameter of the second pipe segment, the diameter of the third pipe segment is smaller than the diameter of the second pipe segment, and the diameter of the fourth pipe segment is larger than the diameter of the second pipe segment.

[0014] In some embodiments, a first installation and fixing block is provided at one end of the fourth pipe segment away from the third pipe segment.

[0015] On the other hand, the present application also provides an injection mold, comprising an internal thread core-pulling and demolding structure for the injection mold as described in any of the above items.

[0016] The beneficial effect of the present application is that, different from the prior art, in the internal thread core-pulling demoulding structure for the injection mold of the present application, the inner tube is arranged inside the core-pulling insert, and when the inner tube is moved to the direction where the screw thread is located, the multiple second moving parts are pushed together and gradually expand outward and spliced ​​with the multiple first moving parts, so that the screw thread is fully spliced ​​for injection molding after the mold is closed, and when the injection molding is completed at the screw thread and the mold needs to be demoulded, the inner tube is moved first to reset the multiple second moving parts, and then part of the screw thread on each second moving part is separated from the product; then the sleeve is moved to the direction where the screw thread is located, and the multiple first moving parts will be squeezed together to move inward, so that part of the screw thread on each first moving part is also separated from the product, and finally the internal thread product that is buckled on the screw thread can be completely demoulded. This design of explosive demoulding of the screw thread helps the product to be demoulded smoothly, is easy and accurate to operate, effectively improves the demoulding quality and efficiency, has a simple overall structure, and the required installation space can be compatible with the overall structural design of the injection mold, which is convenient for promotion and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 Schematic diagram of an internal thread core-pulling demoulding structure for an injection mold in an embodiment of the present application;

[0018] Figure 2 This is a schematic diagram of a state of a core-pulling insert in an embodiment of the present application;

[0019] Figure 3 It is a schematic diagram of the structure of the inner tube in the embodiment of the present application;

[0020] Figure 4 It is a schematic diagram of the structure of the sleeve in the embodiment of the present application;

[0021] Figure 5 is another state schematic diagram of the core-pulling insert in the embodiment of the present application;

[0022] Figure 6 is a top view schematic diagram of a core-pulling insert in an embodiment of the present application;

[0023] Figure 7 is a schematic diagram of the cooperation between the positioning groove and the positioning portion in the embodiment of the present application;

[0024] Figure 8 is a schematic diagram of an injection mold in an embodiment of the present application;

[0025] Fig. 9 It is a schematic side sectional view of the interior of the injection mold in the embodiment of the present application. DETAILED DESCRIPTION

[0026] The terms "first", "second", "third" and "fourth" etc. in the specification and claims of the present application and the drawings are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally includes steps or units that are not listed, or optionally includes other steps or units inherent to these processes, methods, products or devices.

[0027] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0028] "Multiple" means two or more. "And / or" describes the relationship between related objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the related objects are in an "or" relationship.

[0029] Moreover, the terms "up, down, front, back, left, right, upper end, lower end" etc. indicating directions are all based on the posture and position of the device or equipment described in this solution during normal use.

[0030] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the following will be described clearly and completely in combination with the technical solutions in the embodiments of the present application. Obviously, the described embodiments are some embodiments of the present application, not all embodiments. Based on the embodiments of the present application, all other embodiments obtained by ordinary technicians in this field without creative work belong to the protection scope of the present application.

[0031] Embodiment 1: The embodiment of the present application provides an internal thread core-pulling demoulding structure 100 for an injection mold, such as Figures 1 to 7As shown in the figure, the internal thread core-pulling demoulding structure 100 for injection mold comprises a core-pulling insert 1, an inner tube 2 and a sleeve 3; the core-pulling insert 1 is hollow inside, and a screw thread 10 is provided on the outer peripheral side of the first end of the core-pulling insert 1; the first end of the core-pulling insert 1 also has a plurality of first moving parts 11 which divide the screw thread 10 along its axial direction and are arranged in a circular array, and a second moving part 12 is formed between any two adjacent first moving parts 11; in the initial state, the plurality of second moving parts 1 2 all move inwards and are staggered with the multi-segment first moving parts 11; the inner tube 2 is inserted into the core-pulling insert 1, and when the inner tube 1 is moved toward the direction of the screw thread 10, the multi-segment second moving parts 12 are pushed and gradually spread outwards and are spliced ​​with the multi-segment first moving parts 11; the sleeve 3 is sleeved outside the core-pulling insert 1, and when the inner tube 2 does not push the multi-segment second moving parts 12 and the moving sleeve 3 is moved toward the direction of the screw thread 10, the multi-segment first moving parts 11 are squeezed and gradually move toward the inner center.

[0032] In the internal thread core-pulling demoulding structure 100 for the injection mold of the embodiment of the present application, the core-pulling insert 1 is in the shape of a circular tube, and its first end is used for injection molding. Therefore, the screw thread 10 is arranged at this end and applied to the injection mold 200 to complete the undercut injection molding of the internal thread product; the product with internal thread is such as a bottle cap. Among them, the first end of the core-pulling insert 1 is divided into multiple sections of the first moving part 11 and multiple sections of the second moving part 12. It can be understood that the first end of the core-pulling insert 1 is divided into a circumferential division, for example, the first moving part 11 is first divided according to the preset arc segment length and according to a certain interval, and the corresponding part at each interval is the second moving part 12, so that the screw thread 10 on this end is correspondingly divided into each first moving part 11 and each second moving part 12. When each first moving part 11 and each second moving part 12 are pieced together, the complete screw thread 10 can be restored; generally, it is divided at equal intervals. The preset arc segment length can be designed and selected according to the actual application needs, and is not specifically limited here.

[0033] In the internal thread core-pulling demoulding structure 100 for the injection mold of the embodiment of the present application, the inner tube 2 is inserted into the core-pulling insert 1. When the inner tube 2 is moved toward the direction of the screw thread 10, the multiple second moving parts 12 are pushed together and gradually expand outward and are assembled with the multiple first moving parts 11, so that the screw thread 10 is assembled completely for injection molding after the mold is closed. When the injection molding is completed at the screw thread 10 and the mold needs to be demoulded to remove the undercut product, the inner tube 2 is moved first so that the multiple second moving parts 12 are not pushed. And reset, part of the screw thread 10 on each section of the second moving part 12 will be separated from the product; then the sleeve 3 is moved closer to the direction of the screw thread 10, and the multiple sections of the first moving parts 11 will be squeezed inward together, so that part of the screw thread 10 on each section of the first moving part 11 will also be separated from the product, and finally the internal thread product undercut on the screw thread 10 can be completely demoulded; the design of explosive demoulding of the screw thread 10 helps to demould the product smoothly, the operation is convenient and accurate, and the demoulding quality is effectively improved.

[0034] Specifically, in the present embodiment, a receiving groove 120 is provided on the inner wall of any second movable part 12, and a spring 121 and a movable block 122 are provided in the receiving groove 120; the first end of the spring 121 is fixedly provided on the inner wall of the receiving groove 120, the first end of the movable block 122 is fixedly connected to the second end of the spring 121, and the second end of the movable block 122 is located outside the receiving groove 120; a positioning groove 201 is provided on the inner tube 2 around its outer peripheral side surface, and a positioning part for fitting into the positioning groove 201 is also provided at the second end of the movable block 122. The positioning of the inner tube 2 is achieved through the cooperation between the positioning part and the positioning groove 201, so that the inner tube 2 will not move after moving to a suitable position height, and at this time, the multi-section second movable part 12 and the multi-section first movable part 11 should also be assembled in place, so that the screw thread 10 can be restored to its integrity and no longer be in an explosively expanded state, so as to facilitate the next injection molding process.

[0035] Further, in this embodiment, the positioning groove 201 has a first inclined surface 2011 and a second inclined surface 2012 which are relatively distributed up and down, and a plurality of equally spaced longitudinally distributed blocks 20 are respectively provided on the first inclined surface 2011 and the second inclined surface 2012. Since the first inclined surface 2011 and the second inclined surface 2012 are relatively inclined, the blocks 20 on the first inclined surface 2011 are parallel to the first inclined surface 2011, and the blocks 20 on the second inclined surface 2012 are parallel to the second inclined surface 2012. Among them, the positioning portion has a third inclined surface 1221 which is in contact with the first inclined surface 2011 and a fourth inclined surface 1222 which is in contact with the second inclined surface 2012. The third inclined surface 1221 and the fourth inclined surface 1222 are respectively provided with a plurality of equally spaced slots 1220 which are used for the corresponding blocks 20 to be adapted and inserted, so as to achieve further positioning.

[0036] Specifically, in this embodiment, a recess 101 is provided in the middle of the outer periphery of the core-pulling insert 1, which surrounds the outer periphery side thereof. The side of the multi-segment first movable portion 11 and the multi-segment second movable portion 12 away from the screw thread 10 extends to the recess 101. There is a gap 40 between any first movable portion 11 and any adjacent second movable portion 12 at the recess 101. The gap 40 can provide a smooth space for the relative movement of the first movable portion 11 and the second movable portion 12. The width of the gap 40 is, for example, 1±0.5CM or other. There is no gap 40 between the first movable portion 11 and the second movable portion 12 at the position for splicing the screw thread 10, because it is necessary to ensure that they can be closely attached to each other during splicing to ensure that the screw thread 10 is fully spliced ​​and the injection molding is not affected.

[0037] Specifically, in this embodiment, the inner tube 2 is a solid structure; the first end of the inner tube 2 is on the same side as the first end of the core-pulling insert 1, and a groove 202 is provided on the end surface of the first end of the inner tube 2, and the shape of the groove 202 is circular. When the inner tube 2 is inserted into the core-pulling insert 1 and in place, the end surface of the first end of the inner tube 2 is flush with the end surface of the first end of the core-pulling insert 1, and the groove 202 is exposed to assist injection molding.

[0038] Furthermore, in this embodiment, the inner tube 2 includes a first tube segment 21, a second tube segment 22, a third tube segment 23, and a fourth tube segment 24 which are integrally connected and formed in sequence from top to bottom. The diameter of the first tube segment 21 is the same as the diameter of the second tube segment 22, the diameter of the third tube segment 23 is smaller than the diameter of the second tube segment 22, and the diameter of the fourth tube segment 24 is larger than the diameter of the second tube segment 22, so that the third tube segment 23 between the second tube segment 22 and the fourth tube segment 24 is concave.

[0039] The positioning groove 201 is provided on the outer peripheral side of the first pipe section 21, and the specific position height of the positioning groove 201 should be based on the positioning portion that can be adapted to the movable block 122. The fourth pipe section 24 is provided with a first mounting block 25 at one end away from the third pipe section 23, and the first mounting block 25 and the fourth pipe section 24 are also an integrated connection structure.

[0040] The first end of the inner tube 2, i.e., the first tube section 21, first extends from the second end of the core-pulling insert 1 into the core-pulling insert 1, and the first mounting fixing block 25 is used to be fixed on a push plate in the injection mold 200 to achieve the purpose of driving the inner tube 2 to move up or down in the core-pulling insert 1. Figure 2 , 5As shown, the first end of the core-pulling insert 1 is the upper end of the core-pulling insert 1, and the second end of the core-pulling insert 1 is the lower end of the core-pulling insert 1. The lower end of the core-pulling insert 1 should also be fixedly mounted on other corresponding plates in the injection mold 200. The lower end of the sleeve 3 is fixedly mounted on another push plate in the injection mold, for example, by a second mounting block, so as to achieve the purpose of driving the sleeve 3 to move up or down relative to the core-pulling insert 1.

[0041] Embodiment 2: The present embodiment provides an injection mold 200, including the internal thread core-pulling demoulding structure 100 for the injection mold provided in the first embodiment. The description of the internal thread core-pulling demoulding structure 100 for the injection mold can be found in the first embodiment, and will not be repeated in this embodiment. Figure 8 , 9 As shown in , when multiple sets of the internal thread core-pulling demoulding structures 100 for the injection mold are arranged in the injection mold 200, the demoulding purpose of multiple sets of internal thread products can be achieved, and the batch demoulding efficiency can be effectively improved.

[0042] It should be noted that the layout of the multiple sets of internal thread core-pulling demolding structures 100 for injection molds arranged in the injection mold 200 shown in the drawings of this embodiment is only an example and does not constitute a specific limitation, and should be based on actual application.

[0043] It should be understood that ordinary technical workers in the field can make improvements or changes based on the above description, and all these improvements and changes should fall within the scope of protection of the claims attached to this application.

Claims

1. An internal thread core-pulling demoulding structure for an injection mold, characterized in that: It comprises a core-pulling insert, an inner tube and a sleeve; the interior of the core-pulling insert is hollow, and a screw thread is arranged on the outer peripheral side surface of the first end of the core-pulling insert; the first end of the core-pulling insert also has a plurality of first movable parts which divide the screw threads along its axial direction and are in a circular array, and a second movable part is formed between any two adjacent first movable parts; in an initial state, the plurality of second movable parts are all moved inwardly and staggered with the plurality of first movable parts; the inner tube is passed through the core-pulling insert, and when the inner tube is moved toward the direction where the screw threads are located, the plurality of second movable parts are pushed and gradually expand outwardly and are spliced ​​with the plurality of first movable parts; the sleeve is sleeved outside the core-pulling insert, and when the inner tube does not push the plurality of second movable parts and the sleeve is moved toward the direction where the screw threads are located, the plurality of first movable parts are squeezed and gradually move inwardly.

2. The internal thread core-pulling demoulding structure for injection mold according to claim 1, characterized in that: A receiving groove is provided on the inner wall of any second movable part, and a spring and a movable block are provided in the receiving groove; the first end of the spring is fixedly provided on the inner wall of the receiving groove, the first end of the movable block is fixedly connected to the second end of the spring, and the second end of the movable block is located outside the receiving groove; the inner tube is provided with a positioning groove surrounding its outer circumferential side surface, and the second end of the movable block is also provided with a positioning portion for fitting into the positioning groove.

3. The internal thread core-pulling demoulding structure for injection mold according to claim 2, characterized in that: The positioning groove has a first inclined surface and a second inclined surface which are relatively distributed up and down, and the first inclined surface and the second inclined surface are respectively provided with a number of equally spaced longitudinally distributed card blocks; the positioning portion has a third inclined surface which is in contact with the first inclined surface and a fourth inclined surface which is in contact with the second inclined surface, and the third inclined surface and the fourth inclined surface are respectively provided with a number of equally spaced card slots for corresponding card blocks to fit into.

4. The internal thread core-pulling demoulding structure for injection mold according to claim 1, characterized in that: A depression surrounding the outer peripheral side of the core-pulling insert is provided in the middle of the outer periphery, and the side of the multi-segment first movable part and the multi-segment second movable part away from the screw thread both extend to the depression.

5. The internal thread core-pulling demoulding structure for injection mold according to claim 4, characterized in that: A gap is provided between any of the first moving parts and any of the adjacent second moving parts at the recessed portion.

6. The internal thread core-pulling demoulding structure for injection mold according to claim 2, characterized in that: The inner tube is a solid structure; the first end of the inner tube is on the same side as the first end of the core-pulling insert, and a groove is provided on the end surface of the first end of the inner tube.

7. The internal thread core-pulling demoulding structure for injection mold according to claim 2, characterized in that: The inner tube comprises a first tube segment, a second tube segment, a third tube segment and a fourth tube segment which are integrally connected and formed in sequence from top to bottom; the positioning groove is arranged on the outer peripheral side surface of the first tube segment.

8. The internal thread core-pulling demoulding structure for injection mold according to claim 7, characterized in that: The diameter of the first pipe segment is the same as that of the second pipe segment, the diameter of the third pipe segment is smaller than that of the second pipe segment, and the diameter of the fourth pipe segment is larger than that of the second pipe segment.

9. The internal thread core-pulling demoulding structure for injection mold according to claim 7 or 8, characterized in that: A first installation and fixing block is provided at one end of the fourth pipe section away from the third pipe section.

10. An injection mold, characterized in that: The invention comprises the internal thread core pulling and demoulding structure for injection molds as described in any one of claims 1 to 9.

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