Internal shrinkage type thread demolding structure

Abstract

The utility model discloses an internal shrinkage type thread demoulding structure, which comprises a plurality of first modules, a plurality of second modules and a driving module, the outer walls of the plurality of first modules and the plurality of second modules are provided with threads which are communicated in sequence, the plurality of first modules and the plurality of second modules are uniformly and annularly distributed by taking the driving module as a circle center, and the driving module is arranged on the driving module. The driving module comprises a sliding body, the outer wall of the sliding body is connected with the inner walls of the first modules and the second modules in a sliding mode, the outer wall of the sliding body is not parallel to the inner walls of the first modules and the second modules, and when the outer wall of the sliding body is completely attached to the inner walls of the first modules and the second modules, the outer walls of the first modules and the outer walls of the second modules are connected. And the sections of the plurality of first modules and the plurality of second modules are circular. The demoulding device has the beneficial effects that the demoulding device is completely different from a rotary demoulding mode, and a molded plastic part cannot be damaged in the demoulding process.

Description

Technical Field

[0001] The utility model relates to the technical field of mold processing, in particular to an inward-retracting screw thread demoulding structure. Background Art

[0002] Molds are various molds and tools used in industrial production to obtain the desired products by injection molding, blow molding, extrusion, die casting or forging molding, smelting, stamping and other methods. In short, molds are tools used to make molded objects. This tool is composed of various parts, and different molds are composed of different parts. It mainly realizes the processing of the shape of the object by changing the physical state of the molded material, and makes the blank into a tool with a specific shape and size under the action of external force. The mold has a specific contour or inner cavity shape. The application of the contour shape with a cutting edge can make the blank separate (punch) according to the contour shape). The application of the inner cavity shape can make the blank obtain the corresponding three-dimensional shape. The mold generally consists of two parts: the movable mold and the fixed mold (or the punch and the die), which can be separated or combined. When separated, the product is taken out, and when closed, the blank is injected into the mold cavity for forming.

[0003] In the design of a mold with a general screw thread, the screw thread mold core of the screw thread mold in the prior art is demoulded by a rotating method. However, this rotary demoulding method is easy to damage the molded plastic part due to the large friction between the cores during the rotary core pulling process.

[0004] Therefore, it is necessary to propose an inward-retracting screw thread demoulding structure, which is completely different from the rotary demoulding method and will not damage the molded plastic parts during the demoulding process. Utility Model Content

[0005] The utility model aims to overcome the shortcomings of the prior art and proposes an inward-retracting screw thread demoulding structure, which is completely different from the rotary demoulding method and will not damage the molded plastic parts during the demoulding process.

[0006] The purpose of the utility model is achieved through the following technical solutions: a retractable screw thread demoulding structure, comprising a plurality of first modules, a plurality of second modules and a driving module, the outer walls of the plurality of first modules and the plurality of second modules are provided with screw threads connected in sequence, the plurality of first modules and the plurality of second modules are evenly distributed in an annular shape with the driving module as the center, the driving module comprises a sliding body whose outer wall is slidably connected to the inner walls of the first module and the second module, the outer wall of the sliding body is not parallel to the inner walls of the first module and the second module, when the outer wall of the sliding body is completely fitted with the inner walls of the first module and the second module, the outer walls of the plurality of first modules and the plurality of second modules are connected, and the cross-sections of the plurality of first modules and the plurality of second modules are circular.

[0007] The sliding body is cylindrical.

[0008] A first slide groove is provided on the inner wall of the first module, a second slide groove is provided on the inner wall of the second module, and a slide bar matching the first slide groove and the second slide groove is provided on the outer wall of the sliding body.

[0009] The first module and the second module are provided with positioning blocks, a slide rod is slidably passed through the positioning block, a clamping block for limiting the sliding of the sliding body is provided at one end of the slide rod, and a return spring is sleeved on the slide rod, with both ends respectively connected to the clamping block and the positioning block.

[0010] The driving module includes a connecting column connected to a sliding body, a sliding sleeve on the connecting column is provided with a ring for pushing open the block, the outer wall of the ring is an inclined surface, and the radius of the end of the ring close to the sliding body is smaller than the radius of the end away from the sliding body.

[0011] The ring is connected to the connecting column by a threaded rotating sleeve.

[0012] The beneficial effect of the utility model is that through a simple sliding drive module, multiple first modules and multiple second modules can be moved towards or away from each other, thereby changing the size of the structure so that it can be separated from the molding die in a linear manner. During the separation process, no relative sliding will occur between the two walls and no corresponding friction will be generated, thereby preventing damage to the molded plastic parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of Embodiment 1 of the present utility model;

[0014] Figure 2 This is a schematic diagram of the first module of Embodiment 1 of the present utility model;

[0015] Figure 3 This is a schematic diagram of the second module of Embodiment 1 of the present utility model;

[0016] Figure 4 This is a schematic diagram of a drive module in Embodiment 1 of the present utility model;

[0017] Figure 5 This is a cross-sectional view of Embodiment 2 of the present utility model;

[0018] Figure 6 for Figure 5 A magnified image;

[0019] In the figure, 1-first module, 11-first slide groove, 2-second module, 21-second slide groove, 3-driving module, 31-sliding body, 32-sliding bar, 33-connecting column, 34-ring, 4-screw thread, 51-positioning block, 52-sliding rod, 53-block, 54-reset spring. DETAILED DESCRIPTION

[0020] The following will be combined with the embodiments to clearly and completely describe the technical solution of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0021] It is to be noted that the concepts of directions “left”, “right”, “up”, “down”, “front”, “back”, “inside” and “outside” in the following schemes are all relative directions and will not be listed one by one here.

[0022] A kind of shrinkage screw thread demoulding structure, reference Figure 1-Figure 4 , including a driving module 3 and three first modules 1 and three second modules 2. The three first modules 1 and the three second modules 2 are arranged in a ring shape with the driving module 3 as the center. The outer walls of the first module 1 and the second module 2 are provided with mutually connected screw threads 4. The inner wall of the first module 1 is provided with a first slide groove 11, and the inner wall of the second module 2 is provided with a second slide groove 21.

[0023] The driving module 3 includes a cylindrical sliding body 31 and a connecting column 33 connected to the sliding body 31. The outer wall of the sliding body 31 is provided with a sliding bar 32 that is slidably connected to the first sliding groove 11 and the second sliding groove 21. When the outer wall of the sliding body 31 is completely in contact with the inner walls of the first module 1 and the second module 2, the three first modules 1 and the three second modules 2 form a cylinder, and the screw threads 4 are all connected. When the sliding body 31 slides downward, the three first modules 1 and the three second modules 2 move closer to each other.

[0024] As a further improvement of the present invention, it can be further extended based on the above cases to provide a variety of new embodiments.

[0025] As a second embodiment of the present invention, based on Embodiment 1, Figure 5-Figure 6 , a positioning block 51 is provided at the bottom of the first module 1 and the second module 2. A slide bar 52 is slidably penetrated through the positioning block 51. A clamping block 53 for clamping the slide bar 32 is provided at one end of the slide bar 52 near the connecting column 33. A reset spring 54 is sleeved on the slide bar 52. The two ends of the reset spring 54 are respectively connected to the clamping block 53 and the slide bar 52. A circular ring 34 is threadedly rotatably sleeved on the connecting column 33. The outer wall of the circular ring 34 is an inclined surface. The upper end radius of the circular ring 34 is smaller than the lower end radius.

[0026] When the outer wall of the sliding body 31 is completely in contact with the inner walls of the first module 1 and the second module 2, the block 53 is no longer squeezed by the sliding body 31, the reset spring 34 is reset, and the block 53 clamps the slide bar 32, preventing it from leaving the slide groove. When the sliding body 31 needs to be slid, the ring 34 is rotated, and the ring 34 moves to push the block 53 open, thereby releasing the sliding restriction of the slide bar 32.

[0027] The above is only a preferred embodiment of the utility model. It should be understood that the utility model is not limited to the form disclosed herein, and should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be modified within the scope of the concept described herein through the above description or the technology or knowledge in the relevant field. The changes and modifications made by those skilled in the art do not deviate from the spirit and scope of the utility model, and should be within the scope of protection of the claims attached to the utility model.

Claims

1. A retractable screw thread demoulding structure, comprising a plurality of first modules (1), a plurality of second modules (2) and a driving module (3), wherein the outer walls of the plurality of first modules (1) and the plurality of second modules (2) are provided with screw threads (4) connected in sequence, characterized in that: The plurality of first modules (1) and the plurality of second modules (2) are uniformly distributed in a ring shape with the driving module (3) as the center of the circle. The driving module (3) comprises a sliding body (31) whose outer wall is slidably connected to the inner walls of the first module (1) and the second module (2). The outer wall of the sliding body (31) is not parallel to the inner walls of the first module (1) and the second module (2). When the outer wall of the sliding body (31) is completely in contact with the inner walls of the first module (1) and the second module (2), the outer walls of the plurality of first modules (1) and the plurality of second modules (2) are connected, and the cross-sections of the plurality of first modules (1) and the plurality of second modules (2) are circular.

2. The inward-retracting screw thread demoulding structure according to claim 1, characterized in that: The sliding body (31) is cylindrical.

3. The inward-retracting screw thread demoulding structure according to claim 1, characterized in that: The first module (1) has a first slide groove (11) on its inner wall, the second module (2) has a second slide groove (21) on its inner wall, and the sliding body (31) has a slide bar (32) on its outer wall that matches the first slide groove (11) and the second slide groove (21).

4. The inward-retracting screw thread demoulding structure according to claim 1, characterized in that: The first module (1) and the second module (2) are provided with positioning blocks (51), a slide rod (52) is slidably penetrated through the positioning block (51), a clamping block (53) for limiting the sliding of the sliding body (31) is provided at one end of the slide rod (52), and a return spring (54) is sleeved on the slide rod (52), the two ends of which are respectively connected to the clamping block (53) and the positioning block (51).

5. The inner-retractable screw thread demoulding structure according to claim 4, characterized in that: The driving module comprises a connecting column (33) connected to a sliding body (31); a circular ring (34) for pushing open a clamping block (53) is provided on a sliding sleeve on the connecting column (33); an outer wall of the circular ring (34) is an inclined surface; and a radius of an end of the circular ring (34) close to the sliding body (31) is smaller than a radius of an end of the circular ring (34) away from the sliding body (31).

6. The inward-retracting screw thread demoulding structure according to claim 5, characterized in that: The circular ring (34) is connected to the connecting column (33) by being threadedly rotatably sleeved.

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