A female thread core-pulling demolding structure for an injection mold and an injection mold

Abstract

The application relates to an inner thread core-pulling demolding structure for an injection mold and the injection mold; the structure comprises a core-pulling insert, an inner tube and a sleeve; the first end of the core-pulling insert is provided with a screw thread; the first end of the core-pulling insert is also provided with a plurality of first moving parts which are divided along the axial direction of the screw thread and arranged in a circular array, and a second moving part is formed between any two adjacent first moving parts; in an initial state, the plurality of second moving parts are inwardly close to each other and are distributed in a staggered mode with the plurality of first moving parts; the inner tube is arranged in the core-pulling insert; when the inner tube is moved to be close to the screw thread, the plurality of second moving parts are gradually unfolded outwardly and are combined with the plurality of first moving parts; the sleeve is arranged outside the core-pulling insert; when the inner tube does not push the plurality of second moving parts and the sleeve is moved to be close to the screw thread, the plurality of first moving parts are gradually close to each other under extrusion; the inner thread product can be smoothly demolded, the operation is convenient and accurate, and the demolding quality and efficiency are effectively improved.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of injection mold stripping, in particular to an inner thread core-pulling stripping structure for an injection mold and the injection mold. BACKGROUND

[0002] In the prior art, a common scheme for realizing stripping of an inner threaded product is, for example, that a motor drives a chain or an oil cylinder pulls a rack, then the chain or the rack drives a gear to rotate, and finally the gear drives a connecting rod to rotate to realize stripping. Both of the two existing schemes have the advantages of fast rotation and fast stripping. However, since the chain or the rack transmission is prone to wear and tear and has a certain sliding phenomenon, it cannot guarantee a strict transmission ratio, which will lead to inaccurate power transmission, thereby affecting the stripping precision and the stripping quality, and the actual stripping efficiency is not high. Moreover, both of the two existing schemes need a large installation space, which will limit the overall structural design of the injection mold and increase the design complexity.

[0003] Application Content

[0004] The application aims to solve the above-mentioned defects of the prior art and provides an inner thread core-pulling stripping structure for an injection mold and the injection mold.

[0005] The application adopts the technical scheme that:

[0006] In one aspect, the application provides an inner thread core-pulling stripping structure for an injection mold, which comprises a core-pulling insert, an inner tube and a sleeve. The core-pulling insert is hollow inside, and the outer circumferential surface of the first end of the core-pulling insert is provided with a screw thread. The first end of the core-pulling insert also has a plurality of first moving parts which are divided along the axial direction of the screw thread and arranged in a circumferential array, and a second moving part is formed between any two adjacent first moving parts. In the initial state, the plurality of second moving parts are inwardly close to each other and are distributed in an interlaced manner with the plurality of first moving parts. The inner tube is arranged in the core-pulling insert. When the inner tube is moved to be close to the screw thread, the plurality of second moving parts are gradually unfolded outwardly and are combined with the plurality of first moving parts. The sleeve is arranged outside the core-pulling insert. When the sleeve is moved to be close to the screw thread without pushing the plurality of second moving parts, the plurality of first moving parts are gradually close to each other.

[0007] In some embodiments, each of the second moving parts is provided with a receiving groove, and a spring and a movable block are arranged in the receiving groove; a first end of the spring is fixedly arranged on an inner wall of the receiving groove, a first end of the movable block is fixedly connected with a second end of the spring, and a second end of the movable block is located outside the receiving groove; the inner tube is provided with a positioning groove surrounding an outer circumferential side surface thereof, and the second end of the movable block is further provided with a positioning portion adapted to be clamped into the positioning groove.

[0008] In some embodiments, the positioning groove has a first inclined surface and a second inclined surface oppositely arranged in an up-down direction, and a plurality of equally-spaced clamping blocks are arranged on the first inclined surface and the second inclined surface respectively; the positioning portion has a third inclined surface adapted to be fitted with the first inclined surface and a fourth inclined surface adapted to be fitted with the second inclined surface, and a plurality of equally-spaced clamping grooves for clamping the corresponding clamping blocks are arranged on the third inclined surface and the fourth inclined surface respectively.

[0009] In some embodiments, a recess is arranged around an outer circumferential side surface of a middle portion of the core-pulling insert, and the side of each of the plurality of first moving parts and the plurality of second moving parts away from the screw thread extends to the recess.

[0010] In some embodiments, a gap is arranged between any of the first moving parts and any of the adjacent second moving parts in the recess.

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

[0012] In some embodiments, 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; and the positioning groove is arranged on an outer circumferential side surface of the first tube segment.

[0013] In some embodiments, the first tube segment has the same diameter as the second tube segment, the third tube segment has a smaller diameter than the second tube segment, and the fourth tube segment has a larger diameter than the second tube segment.

[0014] In some embodiments, a first mounting fixed block is arranged on an end of the fourth tube segment away from the third tube segment.

[0015] In another aspect, the application further provides an injection mold comprising the inner thread core-pulling demolding structure for injection mold as described in any of the above.

[0016] The beneficial effects of the present application are that: in the inner thread core-pulling demolding structure of the injection mold of the present application, the inner tube is arranged in the inside of the core-pulling insert. When the inner tube moves to the direction of the screw thread, the multi-section second moving part is gradually expanded outward and combined with the multi-section first moving part, so that the screw thread is combined complete to perform injection molding after the mold is closed. When the injection molding is completed at the screw thread and demolding is required, the inner tube is moved first, so that the multi-section second moving part is reset, and then the part of the screw thread on each section of the second moving part is separated from the product. Then the sleeve moves to the direction of the screw thread, the multi-section first moving part is squeezed inward, so that the part of the screw thread on each section of the first moving part is separated from the product, and finally the inner thread product with reverse buckle on the screw thread is completely demolded. The design of the explosion type demolding of the screw thread helps the product to be demolded smoothly, and is convenient and accurate to operate, which effectively improves the demolding quality and efficiency, the overall structure is simple, the required installation space can be matched with the overall structure design of the injection mold, and is convenient for popularization and application. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a schematic diagram of the inner thread core-pulling demolding structure of the injection mold in the embodiment of the present application;

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

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

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

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

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

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

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

[0025] Figure 9 is a side cross-sectional view diagram of the inside of the injection mold in the embodiment of the present application. DETAILED DESCRIPTION

[0026] The terms "first", "second", "third", and "fourth" and the like in the description and in the claims of the present application and the accompanying drawings are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. The terms "comprises", "comprising", "includes", "including" and the like are to be construed open-ended, allowing for instances where there are equivalents to processes, methods, systems, products, or devices that do not literally include the recited steps or elements, but that otherwise achieve the same result. Processes, methods, systems, products, or devices that do not literally contain the specific steps or elements but that achieve the same result are considered to be within the scope of the present application.

[0027] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase "in an embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily mutually exclusive of one another. It is expressly understood that any of the embodiments described herein can be incorporated into any other embodiment.

[0028] "Multiple" means two or more. "And / or" describes the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B can represent the three cases of A alone, A and B together, and B alone. The character " / " generally represents that the front and rear associated objects are in an "or" relationship.

[0029] Furthermore, the terms "upper", "lower", "front", "back", "left", "right", "upper end", "lower end" and the like indicate the orientation of the device or equipment in the normal use position.

[0030] In order to make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the present application.

[0031] Example One The embodiments of the present application provide an inner thread core-pulling demolding structure 100 for an injection mold, as shown in Figures 1 to 7As shown in the middle, the injection mold with internal thread core-pulling stripping structure 100 includes core-pulling insert 1, inner tube 2 and sleeve 3; the inside of the core-pulling insert 1 is hollow, and the outer circumferential side of the first end of the core-pulling insert 1 is provided with a screw thread 10; 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 the axial direction thereof and are arranged in a circumferential 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 12 are all inwardly close together and are distributed alternately with the plurality of first moving parts 11; the inner tube 2 is arranged in the core-pulling insert 1, and when the inner tube 1 moves towards the direction of the screw thread 10, the plurality of second moving parts 12 are gradually unfolded outwardly and are combined with the plurality of first moving parts 11; the sleeve 3 is arranged outside the core-pulling insert 1, and when the inner tube 2 does not push the plurality of second moving parts 12 and the sleeve 3 moves towards the direction of the screw thread 10, the plurality of first moving parts 11 are gradually close together towards the center.

[0032] In the injection mold with internal thread core-pulling stripping structure 100 of the embodiment, the core-pulling insert 1 is in the form of a circular tube, and the first end thereof is used for cooperating with injection molding, so the screw thread 10 is arranged at this end and is applied to the injection mold 200 to complete the reverse injection molding of the internal thread product; the product with internal thread is, for example, a bottle cap. Among them, the first end of the core-pulling insert 1 is divided into a plurality of first moving parts 11 and a plurality of second moving parts 12, which can be understood as that the first end of the core-pulling insert 1 is circumferentially divided, for example, the first moving parts 11 are first divided according to a preset arc length and according to a certain interval, and the parts corresponding to each interval are the second moving parts 12, so that the screw thread 10 on the end is correspondingly divided on each first moving part 11 and each second moving part 12, and when each first moving part 11 and each second moving part 12 are combined together, the complete screw thread 10 can be restored; generally, the division is at equal intervals. The preset arc length can be designed and selected according to actual application needs, which is not limited here.

[0033] In the inner thread core-pulling demolding structure 100 of the injection mold of the embodiment, the inner tube 2 is arranged in the inner part of the core-pulling insert 1. When the inner tube 2 is moved to the direction of the screw thread 10, the multiple second moving parts 12 are pushed and gradually unfolded outward and combined with the multiple first moving parts 11, so that the screw thread 10 is combined completely to facilitate injection after the mold is closed. When the injection is completed at the screw thread 10 and the demolding is required to take out the inverted product, the inner tube 2 is first moved, so that the multiple second moving parts 12 are not pushed and reset, and then the part of the screw thread 10 on each second moving part 12 is separated from the product. Then, the sleeve 3 is moved to the direction of the screw thread 10, the multiple first moving parts 11 are squeezed inward, so that the part of the screw thread 10 on each first moving part 11 is separated from the product, and finally the inner thread product inverted on the screw thread 10 can be completely demolded. The design of the explosion type demolding of the screw thread 10 facilitates the smooth demolding of the product, is convenient and accurate to operate, and effectively improves the demolding quality.

[0034] Specifically, in the embodiment, the inner wall of any second moving part 12 is provided with a receiving groove 120, and the receiving groove 120 is provided with a spring 121 and a movable block 122. The first end of the spring 121 is fixedly arranged on the groove inner wall of the receiving groove 120, the first end of the movable block 122 is fixedly connected with the second end of the spring 121, and the second end of the movable block 122 is located outside the receiving groove 120. The inner tube 2 is provided with a positioning groove 201 around the outer peripheral side surface thereof, and the second end of the movable block 122 is further provided with a positioning part for fitting into the positioning groove 201. Through the cooperation of the positioning part and the positioning groove 201, the positioning of the inner tube 2 is realized, so that the inner tube 2 is not moved after being moved to the appropriate position height, and at this time, the multiple second moving parts 12 and the multiple first moving parts 11 should also be combined in place, so that the screw thread 10 can be restored to be complete and not in the explosion type unfolded state, so as to facilitate the next injection process.

[0035] Further, in the embodiment, the positioning groove 201 has a first inclined surface 2011 and a second inclined surface 2012 oppositely distributed upward and downward, and a plurality of equally spaced longitudinal distribution clamping blocks 20 are arranged on the first inclined surface 2011 and the second inclined surface 2012 respectively. Since the first inclined surface 2011 and the second inclined surface 2012 are oppositely inclined, the clamping blocks 20 on the first inclined surface 2011 are parallel to the first inclined surface 2011, and the clamping blocks 20 on the second inclined surface 2012 are parallel to the second inclined surface 2012. The positioning part has a third inclined surface 1221 matched with the first inclined surface 2011 and a fourth inclined surface 1222 matched with the second inclined surface 2012, and a plurality of equally spaced clamping grooves 1220 for fitting the corresponding clamping blocks 20 are arranged on the third inclined surface 1221 and the fourth inclined surface 1222 respectively, so as to realize the further positioning effect.

[0036] Specifically, in the embodiment, the middle part of the outer periphery of the core-pulling insert 1 is provided with a recess 101 surrounding the outer peripheral side surface of the core-pulling insert 1, and the plurality of first moving parts 11 and the plurality of second moving parts 12 are extended to the recess 101 away from the side of the screw thread 10. Among them, there is a gap 40 between any first moving part 11 and any adjacent second moving part 12 at the recess 101, and the gap 40 can provide a smooth space for the relative movement of the first moving part 11 and the second moving part 12, and the width of the gap 40 is, for example, 1±0.5CM or other. While the first moving part 11 and the second moving part 12 do not have a gap 40 between the positions for splicing the screw thread 10, because it is necessary to ensure that they can be tightly attached to each other during splicing, so as to ensure that the screw thread 10 is spliced completely, and the injection molding is not affected.

[0037] Specifically, in the 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 arranged on the end face 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 face of the first end of the inner tube 2 is flush with the end face of the first end of the core-pulling insert 1, and the groove 202 is exposed to assist injection molding.

[0038] Further, in the 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 sequentially and integrally connected from top to bottom. Among them, the diameter of the first tube segment 21 is the same as that of the second tube segment 22, the diameter of the third tube segment 23 is smaller than that of the second tube segment 22, and the diameter of the fourth tube segment 24 is larger than that of the second tube segment 22, so that the second tube segment 22 and the fourth tube segment 24 are concave at the third tube segment 23.

[0039] Among them, the positioning groove 201 is arranged on the outer peripheral side surface of the first tube segment 21, and the specific position height of the positioning groove 201 should be adapted to the positioning part on the movable block 122. The first end of the fourth tube segment 24 away from the third tube segment 23 is provided with a first mounting fixed block 25, and the first mounting fixed block 25 and the fourth tube segment 24 are also an integral connection structure.

[0040] The first end of the inner tube 2, i.e. the first tube segment 21, is first inserted into the core-pulling insert 1 from the second end of the core-pulling insert 1, and the first mounting fixed block 25 is used to be fixed on a push plate in the injection mold 200, so as to realize 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, i.e. the upper end of the core-pulling insert 1, the second end of the core-pulling insert 1, i.e. the lower end of the core-pulling insert 1, the lower end of the core-pulling insert 1 should also be fixedly installed on other corresponding plate bodies in the injection mold 200. The lower end of the sleeve 3 is fixed on another push plate in the injection mold, for example, through a second mounting fixed block, so as to realize the purpose of driving the sleeve 3 to move upward or downward relative to the core-pulling insert 1.

[0041] Example Two The embodiment of the present application provides an injection mold 200 comprising the internal thread core-pulling demolding structure 100 for injection mold provided in the embodiment one. Wherein, the description about the internal thread core-pulling demolding structure 100 for injection mold can refer to the embodiment one, and the embodiment will not be repeated. As shown in the figure, Figure 8 、 9 As shown in the figure, when multiple groups of the internal thread core-pulling demolding structure 100 for injection mold are arranged in the injection mold 200, the demolding purpose of multiple groups of internal thread products can be realized, and the batch demolding efficiency is effectively improved.

[0042] It should be noted that the layout of the multiple groups of the internal thread core-pulling demolding structure 100 for injection mold arranged in the injection mold 200 shown in the figure of the embodiment is only an example and does not constitute a specific limitation, and should be subject to the actual application.

[0043] It should be understood that the above description can be improved or changed by those of ordinary skill in the art, and all these improvements and changes should belong to the protection scope of the appended claims of the present application.

Claims

1. A female thread core-pulling demolding structure for an injection mold, characterized by: The core-pulling insert, the inner tube and the sleeve; the core-pulling insert is hollow inside, the outer peripheral side of the first end of the core-pulling insert is provided with screw threads; the first end of the core-pulling insert also has a plurality of first moving parts that are divided along the axial direction of the screw threads and arranged in a circumferential array, and a second moving part is formed between any two adjacent first moving parts; in the initial state, the plurality of second moving parts are inwardly close together and are distributed alternately with the plurality of first moving parts; the inner tube is arranged in the core-pulling insert, when the inner tube is moved to approach the screw threads, the plurality of second moving parts are gradually unfolded outwardly and are combined with the plurality of first moving parts; the sleeve is arranged outside the core-pulling insert, when the inner tube is not pushed against the plurality of second moving parts and the sleeve is moved to approach the screw threads, the plurality of first moving parts are gradually close together inwardly; the inner wall of any second moving part is provided with a receiving groove, the receiving groove is provided with a spring and a movable block; the first end of the spring is fixedly arranged on the groove inner wall of the receiving groove, the first end of the movable block is fixedly connected with 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 that surrounds the outer peripheral side thereof, and the second end of the movable block is also provided with a positioning part that is adapted to be clamped into the positioning groove.

2. The internally threaded core-draw demolding structure for an injection mold according to claim 1, characterized by: The positioning groove has a first inclined surface and a second inclined surface that are oppositely distributed, and a plurality of equally spaced longitudinal clamping blocks are arranged on the first inclined surface and the second inclined surface respectively; the positioning part has a third inclined surface that is fitted with the first inclined surface and a fourth inclined surface that is fitted with the second inclined surface, and a plurality of equally spaced clamping grooves for accommodating the corresponding clamping blocks are arranged on the third inclined surface and the fourth inclined surface respectively.

3. The internally threaded core-drawing demolding structure for an injection mold according to claim 1, characterized by: The middle part of the outer periphery of the core-pulling insert is provided with a recess that surrounds the outer peripheral side thereof, and the side of the plurality of first moving parts and the plurality of second moving parts that is away from the screw threads extends to the recess.

4. The internally threaded core-drawing demolding structure for an injection mold according to claim 3, characterized by: There is a gap between any first moving part and any adjacent second moving part in the recess.

5. The internally threaded core-drawing demolding structure for an injection mold according to claim 1, characterized by: The inner tube is of 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 arranged on the end face of the first end of the inner tube.

6. The internally threaded core-drawing demolding structure for an injection mold according to claim 1, characterized by: The inner tube comprises a first tube segment, a second tube segment, a third tube segment and a fourth tube segment that are integrally connected in sequence from top to bottom; the positioning groove is arranged on the outer peripheral side of the first tube segment.

7. The internally threaded core-draw demolding structure for an injection mold according to claim 6, characterized by: The diameter of the first tube segment is the same as the diameter of the second tube segment, the diameter of the third tube segment is smaller than the diameter of the second tube segment, and the diameter of the fourth tube segment is larger than the diameter of the second tube segment.

8. The internally threaded core-drawing demolding structure for an injection mold according to claim 6 or 7, characterized by: The end of the fourth tube segment that is away from the third tube segment is provided with a first mounting fixed block.

9. An injection mold characterized by: The inner threaded core-pulling demolding structure for injection molding molds according to any one of claims 1-8.

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