Core-pulling positioning structure of three-way pipe mold

Abstract

The utility model discloses a loose core positioning structure of a three-way pipe mould, which comprises a main loose core and two auxiliary loose cores, the center of one end of the main loose core is provided with a positioning groove and two first matching surfaces symmetrically arranged on the periphery of the positioning groove, one end surface of each auxiliary loose core comprises a second matching surface and a third matching surface, and the second matching surface is provided with a positioning bump; the positioning protruding blocks of the two auxiliary loose cores are used for being inserted into the positioning grooves to achieve loose core positioning, the second matching face is tightly attached to the first matching face, the two third matching faces are tightly attached to each other, the main loose core and the two auxiliary loose cores are connected to form a Y-shaped structure, and the connecting strength of the connecting center of the main loose core and the two auxiliary loose cores is large. And the bad conditions of burrs, cloak and the like of the injection-molded three-way pipe caused by a gap between the main loose core and the auxiliary loose core are avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to injection mold field, especially a kind of core-pulling positioning structure of tee pipe mold. BACKGROUND

[0002] Tee pipe refers to the pipe joint with three openings, which can be divided into T-shaped tee pipe, Y-shaped tee pipe and the like according to shape. The existing tee pipe is usually injection molded, and core-pulling and mold plate are used in the injection molding process. The mold plate is provided with a material injection cavity consistent with the shape of the tee pipe. The core-pulling is pushed into the material injection cavity during injection molding, and the molten material forms a tee pipe around the core-pulling. The core-pulling forms an internal passage of the tee pipe.

[0003] For example, a tee pipe mold core insertion structure is disclosed in Chinese Patent No. CN108115899A, which comprises a straight-through core and a tee core. The straight-through core is provided with an insertion slot, and the tee core is provided with a U-shaped insertion part. The insertion slot and the U-shaped insertion part are tightly connected through close cooperation. The above-mentioned mold core insertion structure is applied to injection molding of T-shaped tee pipe. However, for Y-shaped tee pipe, three core-pullings are required to be tightly connected in the shape of Y. However, the shape structure of the connection between the three core-pullings is relatively complex, and the above-mentioned insertion structure cannot be applied to the core-pulling of Y-shaped tee pipe to achieve tight connection.

[0004] In view of the above problems, the utility model provides a core-pulling positioning structure of tee pipe mold. UTILITY MODEL CONTENTS

[0005] The utility model overcomes the above-mentioned technical deficiencies and provides a core-pulling positioning structure of tee pipe mold, which can tightly connect the main core-pulling and the two auxiliary core-pullings in the shape of Y, thereby avoiding the generation of burrs during injection molding of tee pipe.

[0006] To achieve the above-mentioned purposes, the utility model adopts the following technical solutions:

[0007] A core-pulling positioning structure of tee pipe mold comprises a main core-pulling and two auxiliary core-pullings. The center of one end of the main core-pulling is provided with a positioning groove, and two first matching surfaces are symmetrically arranged on the outer periphery of the positioning groove. The end surface of the auxiliary core-pulling comprises a second matching surface and a third matching surface, and the second matching surface is provided with a positioning protrusion. The positioning protrusions of the two auxiliary core-pullings are used to insert the positioning groove to achieve core-pulling positioning, so that the second matching surface tightly abuts against the first matching surface, and the two third matching surfaces tightly abut against each other. The main core-pulling and the two auxiliary core-pullings are connected in the shape of Y.

[0008] Preferably, the two auxiliary core-pullings are symmetrically arranged about the central axis of the main core-pulling, the third matching surface is located on the central axis of the main core-pulling, and the third matching surface is parallel to the central axis of the main core-pulling.

[0009] Preferably, the positioning protrusion comprises a top end plane, an outer side surface for closely fitting with the positioning recess groove wall, and an inner side plane integrated with the third matching surface.

[0010] Preferably, the width of the positioning recess groove gradually decreases from the groove opening to the groove bottom.

[0011] Preferably, the groove wall of the positioning recess groove is a circular arc surface, and the outer side surface of the positioning protrusion is also a circular arc surface.

[0012] Preferably, the two first matching surfaces are connected to form a V-shaped structure, and the connection of the two first matching surfaces is close to the third matching surface.

[0013] Preferably, the connection of the two first matching surfaces is an arc surface. The second matching surface comprises an oblique surface and a second arc surface for closely fitting with the first arc surface.

[0014] Compared with the prior art, the utility model has the beneficial effects that:

[0015] 1. The positioning protrusion of the two sub-core pulling parts is inserted into the positioning recess groove, the core pulling positioning is realized, the second matching surface closely fits with the first matching surface, the two third matching surfaces closely fit with each other, the connection strength of the main core pulling part and the connection center of the two sub-core pulling parts is increased, and the gap between the main core pulling part and the sub-core pulling part is avoided to cause the three-way pipe of injection molding to have burrs, flaps and other adverse conditions.

[0016] 2. The first matching surface of the main core pulling part and the second matching surface of the sub-core pulling part are regular and simple in shape, the first matching surface and the second matching surface are conveniently fitted and closely fitted, and the fitting deviation and misplacement caused by the too complex matching surface are avoided.

[0017] 3. The connection of the two first matching surfaces of the main core pulling part is a first arc surface, and the second matching surface comprises a second arc surface, so that the wear during the close fitting of the two is reduced, thereby prolonging the service life of the sub-core pulling part and the main core pulling part.

[0018] 4. The width of the positioning recess groove gradually decreases from the groove opening to the groove bottom, an inclined guide structure is formed, the positioning protrusion slides along the inclined positioning recess groove wall and is inserted into the positioning recess groove, the impact force generated when the positioning protrusion is inserted into the positioning recess groove is reduced, and the collision and wear between the core pulling parts are reduced. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is the explosion schematic view of the core pulling positioning structure of the utility model;

[0020] Figure 2 is the overall schematic view of the core pulling positioning structure of the utility model;

[0021] Figure 3 is a sectional view at A-A of Figure 2 ;

[0022] Figure 4 is a whole schematic view of a main core-pulling of the utility model;

[0023] Figure 5 is a whole schematic view of a sub core-pulling of the utility model;

[0024] Figure 6 is a practical application schematic view of the core-pulling positioning structure of the utility model;

[0025] Figure 7 is a connecting schematic view of the main core-pulling and the core-pulling slider of the utility model;

[0026] Figure 8 is a sectional view at B-B of Figure 7 ;

[0027] The implementation, functional features and advantages of the utility model will be further explained in combination with embodiments and with reference to the drawings. DETAILED DESCRIPTION

[0028] The features and other related features of the utility model will be further explained in detail through embodiments, so as to facilitate the understanding of the same industry technical personnel:

[0029] Referring to Figures 1-8 , an embodiment of the core-pulling positioning structure of a tee pipe mold is provided:

[0030] The core-pulling positioning structure of a tee pipe mold comprises one main core-pulling 1 and two sub core-pullings 2. The center of one end of the main core-pulling 1 is provided with a positioning groove 11, and two first matching surfaces 12 are symmetrically arranged on the outer periphery of the positioning groove 11. One end surface of the sub core-pulling 2 comprises a second matching surface 21 and a third matching surface 22, and the second matching surface 21 is provided with a positioning protrusion 23. The positioning protrusions 23 of the two sub core-pullings 2 are used for inserting into the positioning groove 11 to realize core-pulling positioning, and the second matching surface 21 is tightly attached to the first matching surface 12, and the two third matching surfaces 22 are tightly attached to each other. The main core-pulling 1 and the two sub core-pullings 2 are connected into a Y-shaped structure, the connection strength of the center of the connection of the main core-pulling 1 and the two sub core-pullings 2 is large, and the gap between the main core-pulling 1 and the sub core-pulling 2 is avoided to cause the tee pipe of injection molding to have burrs, flaps and other adverse conditions.

[0031] As shown in Figure 3 , the two sub core-pullings 2 are symmetrically arranged with the center axis of the main core-pulling 1, the third matching surface 22 is located on the center axis of the main core-pulling 1, and the third matching surface 22 is parallel to the center axis of the main core-pulling 1.

[0032] As shown in Figure 5As shown, the positioning protrusion 23 comprises a top end plane 231, an outer side plane 232 for closely fitting with the slot wall of the positioning groove 11, and an inner side plane 233 integrated with the third matching surface 22. The width of the positioning groove 11 gradually decreases from the slot opening to the slot bottom, forming an inclined guide structure. The slot wall of the positioning groove 11 is a circular arc surface, and the outer side plane 232 of the positioning protrusion 23 is also a circular arc surface. The outer side plane 232 of the positioning protrusion 23 slides along the inclined slot wall of the positioning groove 11. When the positioning protrusion 23 is completely inserted into the positioning groove 11, the top end plane 231 has a gap with the slot bottom of the positioning groove 11, which helps to reduce the impact force generated when the positioning protrusion 23 is inserted into the positioning groove 11, and reduces the collision and wear between the core pulling parts.

[0033] As shown, Figure 4 the two first matching surfaces 12 are connected to form a V-shaped structure, and the connection of the two first matching surfaces 12 is close to the third matching surface 22. The connection of the two first matching surfaces 12 is a first arc surface 121, and the second matching surface 21 comprises a beveled surface 211 and a second arc surface 212 for closely fitting with the first arc surface 121, which can reduce wear during close fitting, thereby prolonging the service life of the secondary core pulling part 2 and the primary core pulling part 1.

[0034] The secondary core pulling part 2 and the primary core pulling part 1 are the same in structure except for the different end structures for mutual connection. Both the primary core pulling part 1 and the secondary core pulling part 2 comprise a rod body 3, one end of the rod body 3 is provided with a fixing protrusion 31, and the other end of the rod body 3 is provided with a positioning groove 11 or a positioning protrusion 23.

[0035] As shown, Figure 6 the core pulling positioning structure of the tee pipe mold further comprises three core pulling sliders 4. As shown, Figure 8 the core pulling slider 4 is provided with a core pulling channel for the secondary core pulling part 2 and the primary core pulling part 1 to pass through. The diameter of the fixing protrusion 31 is greater than the diameter of the rod body 3. From the fixing protrusion 31 to the end of the secondary core pulling part 2 and the primary core pulling part 1 for mutual connection, the rod body 3 comprises an extension section 32 and a forming section 33 in sequence, and the diameter of the extension section 32 is greater than the diameter of the forming section 33. The core pulling channel comprises a fixing cavity 41 for accommodating the fixing protrusion 31, an extension cavity 42 for accommodating the extension section 32, and a forming cavity 43 for accommodating the forming section 33.

[0036] The junction of the extension section 32 and the forming section 33 is clamped between the forming cavity 43 and the extension cavity 42, and the core pulling slider 4 is temporarily fixedly connected with the core pulling part, so that the core pulling slider 4 can drive the secondary core pulling part 2 or the primary core pulling part 1 to move towards the core pulling connection, thereby achieving core pulling positioning. Part of the product will be injection molded on the outside of the forming section 33 and the forming cavity 43, but will not be injection molded in the extension cavity 42.

[0037] The width of the extension cavity 42 is less than the diameter of the fixing protrusion 31, so that the fixing protrusion 31 does not disengage from the fixing cavity 41 when the core pulling slider 4 pulls the core away from the core connection.

[0038] In the actual injection molding process, one of the main core 1 and the auxiliary core 2 is fixedly connected with the core pulling slider 4 through the fixing member 44, and the accurate position of the main core 1 and the two auxiliary cores 2 can be ensured to be fixed in the condition that the positioning protrusion 23 is clamped with the positioning groove 11. In the embodiment, the fixing member 44 fixes the fixing protrusion 31 in the fixing cavity 41.

[0039] The above is only the preferred embodiment of the present application, and does not limit the patent range of the present application, and any equivalent structural transformation, direct or indirect application in other related technical fields by using the content of the present application specification and drawings are also included in the patent protection range of the present application.

Claims

1. A core-drawing positioning structure of a tee pipe mold, characterized by comprising: The application relates to a core-pulling mechanism, which comprises a main core (1) and two auxiliary cores (2), wherein the main core (1) is provided with a positioning groove (11) in the center of one end, two first matching surfaces (12) are symmetrically arranged on the outer periphery of the positioning groove (11), the one end surface of the auxiliary core (2) comprises a second matching surface (21) and a third matching surface (22), the second matching surface (21) is provided with a positioning protrusion (23), the positioning protrusion (23) of the two auxiliary cores (2) is used for being inserted into the positioning groove (11) to realize core positioning, the second matching surface (21) is tightly attached to the first matching surface (12), the two third matching surfaces (22) are tightly attached to each other, and the main core (1) and the two auxiliary cores (2) are connected into a Y-shaped structure.

2. A core-drawing positioning structure for a tee pipe mold according to claim 1, wherein The two auxiliary cores (2) are symmetrically arranged on the central axis of the main core (1), the third matching surface (22) is located on the central axis of the main core (1), and the third matching surface (22) is parallel to the central axis of the main core (1).

3. A core-drawing positioning structure for a tee pipe mold according to claim 2, wherein The positioning protrusion (23) comprises a top end plane (231), an outer side plane (232) used for being tightly attached to the groove wall of the positioning groove (11), and an inner side plane (233) integrated with the third matching surface (22).

4. A core-drawing positioning structure for a tee pipe mold according to claim 3, wherein The width of the positioning groove (11) gradually decreases from the groove opening to the groove bottom.

5. A core-drawing positioning structure for a tee pipe mold according to claim 4, wherein The groove wall of the positioning groove (11) is a circular arc surface, and the outer side plane (232) of the positioning protrusion (23) is also a circular arc surface.

6. A core-drawing positioning structure for a tee pipe mold according to claim 2, wherein The two first matching surfaces (12) are connected into a V-shaped structure, and the connecting position of the two first matching surfaces (12) is close to the third matching surface (22).

7. A core-drawing positioning structure for a tee pipe mold according to claim 6, wherein The connecting position of the two first matching surfaces (12) is a first arc surface (121), the second matching surface (21) comprises an oblique cutting surface and a second arc surface (212) used for being tightly attached to the first arc surface (121).

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