Internal shrinkage structure for threaded product of mold

Abstract

The utility model provides an inward shrinkage structure of a mold threaded product, and belongs to the technical field of molds. The die thread product inward shrinkage structure comprises a mandrel, and a plurality of first slide blocks and a plurality of second slide blocks are connected to the outer wall of the mandrel in a sliding mode. The plurality of first slide blocks and the plurality of second slide blocks are slidably connected to the mandrel, the plurality of first slide blocks and the plurality of second slide blocks are closed to form mold threads, product internal threads are formed in the mold injection molding process, and when the mold is opened, the first slide blocks and the second slide blocks retract inwards, so that the overall diameter can be shortened, and a product can be taken out conveniently; and in the mold closing process, the cover body assembly is extruded, so that the first slide block and the second slide block are pressed downwards at the same time, the situation that the first slide block is reset in advance can be prevented, rigid collision between the first slide block and the second slide block is avoided, and then damage is avoided.

Description

Technical Field

[0001] The present application relates to the field of molds, and in particular to a mold thread product retraction structure. Background Art

[0002] Plastic parts with full-circle inner undercut features refer to circular plastic parts with lateral convexities or concave sides on the inner wall, such as precision internal thread products, various plastic caps, pipe joints and other structural plastic parts. The key to injection molding of such plastic parts is the demoulding of the inner undercuts. Currently, most of the demoulding methods used are spiral rotary core-pulling demoulding, which usually involves installing a threaded insert in the mold cavity. After the product is cooled and formed, the threaded insert is rotated and core-pulled to separate from the mold, and finally the product is ejected through the corresponding ejector structure.

[0003] The utility model patent with authorization announcement number CN214726149U discloses a mold thread product retraction structure, including: a core shaft, which gradually retracts from bottom to top, and the side wall is provided with multiple first dovetail grooves and multiple first dovetail blocks along the circumferential direction. The first dovetail groove is located between two adjacent first dovetail blocks, so that the first row position and the second row position are retracted during the demolding process to reduce the diameter of the core shaft, thereby facilitating the demolding of the product.

[0004] In the above scheme, the first row position is on the inner side of the two adjacent second row positions, so that when it retracts, the retraction degree of the first row position is greater than that of the second row position, so as to achieve the purpose of overall direct retraction. Therefore, when the first row position and the second row position are reset, the resetting speed of the first row position cannot be greater than the resetting speed of the second row position, otherwise the first row position and the second row position will collide, thereby causing damage. However, during the mold closing process, the first row position is easily affected by the mold closing extrusion and resets first. For this reason, we propose a mold thread product retraction structure. Utility Model Content

[0005] In order to remedy the above deficiencies, the present application provides a mold thread product retraction structure, which aims to improve the problem of the first row position being reset first, which is easy to occur during the mold closing process.

[0006] An embodiment of the present application provides a mold thread product retraction structure, including a core shaft, a plurality of first position blocks and a plurality of second position blocks are slidably connected to the outer wall of the core shaft, the plurality of first position blocks and the plurality of second position blocks are closed on the core shaft to form an external thread of the mold, a cover body assembly is slidably connected to the middle of the top of the core shaft, and the cover body assembly covers the plurality of first position blocks and the plurality of second position blocks.

[0007] In a specific embodiment, a plurality of first dovetail grooves and a plurality of second dovetail grooves are provided on the outer wall of the core shaft, a plurality of the first positioning blocks are respectively slidably connected to a plurality of the first dovetail grooves, and a plurality of the second positioning blocks are respectively slidably connected to a plurality of the second dovetail grooves.

[0008] In a specific embodiment, a plurality of the first dovetail grooves and a plurality of the second dovetail grooves are all arranged obliquely, and one end thereof is directed toward the center of the core shaft.

[0009] In a specific embodiment, a plurality of the first dovetail grooves and a plurality of the second dovetail grooves are arranged at intervals from each other.

[0010] In a specific embodiment, a first positioning groove and a second positioning groove are respectively provided on the inner walls of the first dovetail groove and the second dovetail groove, a first positioning rod and a second positioning rod are respectively penetrated through the first sliding block and the second sliding block, one end of the first positioning rod is slidably disposed in the first positioning groove, and one end of the second positioning rod is slidably disposed in the second positioning groove.

[0011] In a specific embodiment, a slide groove is opened at the center of the top of the core shaft, and the cover body assembly includes a slide rod slidably arranged in the slide groove, and a cover plate is fixedly connected to the top of the slide rod, and the cover plate covers the top of several first row blocks and several second row blocks.

[0012] The beneficial effects of the present application are as follows: by slidingly connecting a plurality of first row blocks and a plurality of second row blocks on the core shaft, the plurality of first row blocks and a plurality of second row blocks are closed to form a mold thread, and an internal thread of the product is formed during the mold injection molding process; when the mold is opened, the first row blocks and the second row blocks are retracted, so that the overall diameter can be shortened to facilitate product removal; and during the mold closing process, the cover body assembly is squeezed, which will press down the first row blocks and the second row blocks at the same time, thereby preventing the first row blocks from resetting first, avoiding hard collisions between the first row blocks and the second row blocks, and thus avoiding damage. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solutions of the implementation methods of the present application, the drawings required for use in the implementation methods will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0014] Figure 1 It is a schematic diagram of the main structure of the mold thread product retracting structure provided in the embodiment of the present application;

[0015] Figure 2 A schematic diagram of the initial closed structure of the first row of blocks and the second row of blocks in the mold thread product retraction structure provided in an embodiment of the present application;

[0016] Figure 3 A schematic diagram of the first row of blocks in the mold thread product indentation structure provided in an embodiment of the present application;

[0017] Figure 4 A schematic diagram of the retracted structure of the first row of blocks and the second row of blocks in the retracted structure of the mold thread product provided in an embodiment of the present application;

[0018] Figure 5 This is a schematic cross-sectional view of the retracted structure of a mold thread product provided in an embodiment of the present application.

[0019] In the figure: 10-core shaft; 110-first dovetail groove; 120-second dovetail groove; 130-first positioning groove; 140-second positioning groove; 20-first row block; 210-first positioning rod; 30-second row block; 310-second positioning rod; 40-cover body assembly; 410-slide rod; 420-cover plate; 50-slide groove. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application.

[0021] See also Figure 1-5 The present application provides a mold thread product retraction structure, including a core shaft 10, on the outer wall of which a plurality of first row blocks 20 and a plurality of second row blocks 30 are slidably connected, the plurality of first row blocks 20 and the plurality of second row blocks 30 are closed on the core shaft 10 to form a mold external thread, a cover assembly 40 is slidably connected to the middle of the top of the core shaft 10, the cover assembly 40 covers the plurality of first row blocks 20 and the plurality of second row blocks 30, specifically, the specific installation structure of the core shaft 10 is the prior art, during the mold opening process, the first row block 20 and the second row block 30 will be retracted, and its specific driving method is the prior art, so as to shorten the overall diameter of the core shaft 10 to facilitate the removal of the molded product, and during the mold closing process, the cover assembly 40 will be squeezed, so that the cover assembly 40 presses down the first row block 20 and the second row block 30 at the same time to achieve its reset purpose.

[0022] See also Figure 2 and 5A plurality of first dovetail grooves 110 and a plurality of second dovetail grooves 120 are provided on the outer wall of the core shaft 10, a plurality of first row position blocks 20 are slidably connected to the plurality of first dovetail grooves 110, respectively, and a plurality of second row position blocks 30 are slidably connected to the plurality of second dovetail grooves 120, respectively. When set, the dovetail structure can be used to limit the first row position blocks 20 and the second row position blocks 30, so that the first row position blocks 20 and the second row position blocks 30 can only move along the dovetail structure. Furthermore, the size of the first row position block 20 is smaller than that of the second row position block 30, and the first row position block 20 is located on the inner side of two adjacent second row position blocks 30.

[0023] See also Figure 5 , a plurality of first dovetail grooves 110 and a plurality of second dovetail grooves 120 are all inclined, and one end thereof is directed toward the center of the core shaft 10, and a plurality of first dovetail grooves 110 and a plurality of second dovetail grooves 120 are spaced apart from each other. It should be noted that the first dovetail grooves 110 and the second dovetail grooves 120 are inclined toward the middle of the core shaft 10, so that the first row block 20 and the second row block 30 move along to achieve the purpose of retracting inward.

[0024] See also Figure 5 The first dovetail groove 110 and the second dovetail groove 120 are respectively provided with a first positioning groove 130 and a second positioning groove 140 on their inner walls, and the first row block 20 and the second row block 30 are respectively penetrated with a first positioning rod 210 and a second positioning rod 310, one end of the first positioning rod 210 is slidably arranged in the first positioning groove 130, and one end of the second positioning rod 310 is slidably arranged in the second positioning groove 140, and a slide groove 50 is provided at the center of the top of the core shaft 10, and the cover body assembly 40 includes a slide rod 410 slidably arranged in the slide groove 50, and a cover plate 420 is fixedly connected to the top of the slide rod 410, and the cover plate 420 covers a plurality of first row positions. The top of the block 20 and several second row blocks 30, in the specific setting, the slide bar 410 is adapted to the slide groove 50, during the retraction process, the first row block 20 will squeeze the cover plate 420, so that the cover plate 420 follows the movement, and the slide bar 410 slides in the slide groove 50 to limit the cover plate 420, and during the mold closing process, the cover plate 420 will be squeezed by the front mold, so that the cover plate 420 squeezes the first row block 20 and the second row block 30 to achieve the reset purpose, and at the same time, it can avoid the situation that the first row block 20 is squeezed and reset first, thereby avoiding the collision damage between the first row block 20 and the second row block 30.

[0025] The working principle of the retraction structure of the threaded product of this mold: during the mold opening process, the first row block 20 and the second row block 30 will be lifted up, so that the first row block 20 and the second row block 30 slide on the first dovetail groove 110 and the second dovetail groove 120 respectively to achieve the purpose of retraction. At the same time, the first row block 20 drives the cover plate 420 to follow the movement. After the retraction is completed, it is convenient to take out the molded product. During the mold closing process, the cover plate 420 will be squeezed, so that the cover plate 420 squeezes the first row block 20 and the second row block 30 at the same time to achieve the purpose of synchronously resetting the first row block 20 and the second row block 30, and then the next injection molding process can be carried out.

[0026] It should be noted that the specific models and specifications of the core shaft 10, the first row block 20 and the second row block 30 need to be selected and determined according to the actual specifications of the device, and the specific selection calculation method adopts the existing technology in the field, so it will not be described in detail.

[0027] The above description is only an embodiment of the present application and is not intended to limit the scope of protection of the present application. For those skilled in the art, the present application may have various changes and variations. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included in the scope of protection of the present application. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

Claims

1. A mold thread product retracting structure, characterized in that: The invention comprises a core shaft (10), wherein a plurality of first positioning blocks (20) and a plurality of second positioning blocks (30) are slidably connected to the outer wall of the core shaft (10), wherein the plurality of first positioning blocks (20) and the plurality of second positioning blocks (30) are closed on the core shaft (10) to form an external thread of the mold, and a cover assembly (40) is slidably connected to the middle of the top of the core shaft (10), wherein the cover assembly (40) covers the plurality of first positioning blocks (20) and the plurality of second positioning blocks (30).

2. A mold thread product retracting structure according to claim 1, characterized in that: A plurality of first dovetail grooves (110) and a plurality of second dovetail grooves (120) are provided on the outer wall of the core shaft (10); a plurality of the first positioning blocks (20) are respectively slidably connected to the plurality of the first dovetail grooves (110); and a plurality of the second positioning blocks (30) are respectively slidably connected to the plurality of the second dovetail grooves (120).

3. A mold thread product retracting structure according to claim 2, characterized in that: A plurality of the first dovetail grooves (110) and a plurality of the second dovetail grooves (120) are all arranged in an inclined manner, and one end of each of them faces the center of the core shaft (10).

4. A mold thread product retracting structure according to claim 2, characterized in that: A plurality of the first dovetail grooves (110) and a plurality of the second dovetail grooves (120) are arranged at intervals from each other.

5. A mold thread product retracting structure according to claim 4, characterized in that: A first positioning groove (130) and a second positioning groove (140) are respectively provided on the inner walls of the first dovetail groove (110) and the second dovetail groove (120); a first positioning rod (210) and a second positioning rod (310) are respectively passed through the first positioning block (20) and the second positioning block (30); one end of the first positioning rod (210) is slidably disposed in the first positioning groove (130), and one end of the second positioning rod (310) is slidably disposed in the second positioning groove (140).

6. A mold thread product retracting structure according to any one of claims 1 to 5, characterized in that: A slide groove (50) is provided at the center of the top of the core shaft (10), and the cover body assembly (40) includes a slide rod (410) slidably arranged in the slide groove (50), and a cover plate (420) is fixedly connected to the top of the slide rod (410), and the cover plate (420) covers the top of a plurality of the first row blocks (20) and a plurality of the second row blocks (30).

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