CN210617179U

CN210617179U - Injection mould hot runner valve needle structure

Info

Publication number: CN210617179U
Application number: CN201921374586.2U
Authority: CN
Inventors: 蒋灵怀; 刘长安
Original assignee: Kunshan Zhunda Hot Runner Co ltd
Current assignee: Kunshan Zhunda Hot Runner Co ltd
Priority date: 2019-08-23
Filing date: 2019-08-23
Publication date: 2020-05-26
Anticipated expiration: 2029-08-23

Abstract

The utility model discloses an injection mould hot runner valve needle structure, which belongs to the technical field of mould manufacturing, and comprises a mould core with a holding cavity, wherein the bottom of the holding cavity is provided with a conical sprue, the periphery of the conical sprue is provided with a plurality of feed back grooves, and a valve body for pouring gate sealing glue is arranged in the holding cavity; the valve body comprises a valve rod, a boss arranged at the bottom of the valve rod and a conical valve needle arranged at the bottom of the boss, wherein the boss is arranged on the material return groove, and the conical valve needle is correspondingly matched with the conical pouring gate. The utility model is used for realize that the needle location is accurate, reduce the hot runner system processing degree of difficulty.

Description

Injection mould hot runner valve needle structure

Technical Field

The utility model belongs to the technical field of the mould, especially, relate to an injection mould hot runner needle structure.

Background

The injection mold hot runner system opens or closes a pouring gate in a mechanical movement mode at a preset moment through a valve needle under the action of a valve needle control device; the valve needle belongs to a component of an injection mold hot runner system, and the valve needle controls the opening and closing of the glue injection process through the up-down lifting process.

The front end of the existing valve needle 1 is of a cylindrical structure, see the attached drawing 1, the front end and the gate mold core 2 adopt a cylindrical straight-surface glue sealing mode, the front end and the gate mold core are required to have higher positioning precision, the concentricity of the valve needle and the gate glue sealing position is ensured, position dislocation occurs when the valve needle closes the gate easily, the valve needle and the mold core are worn at a glue inlet, the processing is difficult, the manufacturing cost is high, and the rejection rate is increased.

SUMMERY OF THE UTILITY MODEL

The utility model aims at solving the technical problem and providing injection mould hot runner needle structure to realize that the needle location is accurate, reduce the hot runner system processing degree of difficulty. In order to achieve the above purpose, the utility model discloses technical scheme as follows:

the injection mold hot runner valve needle structure comprises a mold core with an accommodating cavity, wherein a conical sprue is arranged at the bottom of the accommodating cavity, a plurality of material returning grooves are formed in the periphery of the conical sprue, and a valve body for pouring sealant is arranged in the accommodating cavity; the valve body comprises a valve rod, a boss arranged at the bottom of the valve rod and a conical valve needle arranged at the bottom of the boss, wherein the boss is arranged on the material return groove, and the conical valve needle is correspondingly matched with the conical pouring gate.

Specifically, the tapered gate is of a structure with a wide top and a narrow bottom, the opening with the larger radial dimension faces the accommodating cavity, and the opening with the smaller radial dimension faces the cavity.

Specifically, a material return groove in a quartering position is arranged at the bottom of the accommodating cavity, and the inner end of the material return groove is communicated with the conical pouring gate.

Specifically, the feed back groove extends outwards in a fan-shaped structure from the end part of the conical gate.

Specifically, a step surface is formed between the adjacent feed back grooves.

Specifically, the valve rod is vertically arranged in the accommodating cavity, the conical valve needle is correspondingly inserted into the conical pouring gate, and the boss is correspondingly attached to the step surface.

Compared with the prior art, the utility model discloses injection mould hot runner needle structure's beneficial effect mainly embodies:

the bottom of the conical valve needle and the bottom of the conical pouring gate are sealed, the thermal expansion length of the conical valve needle is not influenced by the change of the glue injection temperature, the conical valve needle is stably positioned by the boss and the step surface and is erected on the material return groove, the positioning is accurate, and the pouring gate is sealed in place; the material return groove extends outwards from the end part of the conical pouring gate in a fan-shaped structure, so that the overflowing colloid in the glue sealing process is effectively stored, and the pouring gate is prevented from flashing or jacking up the mold core; the conical valve needle and the die core do not generate friction, the processing difficulty of a hot runner system and a die is reduced, and the service lives of the conical valve needle and the die are prolonged.

Drawings

FIG. 1 is a schematic view of a prior art structure of the present invention;

fig. 2 is a schematic cross-sectional view of an embodiment of the invention;

FIG. 3 is a schematic structural view of a conical valve body according to the present embodiment;

fig. 4 is a schematic view of the internal structure of the accommodating cavity in the present embodiment;

the figures in the drawings represent:

1 mould core, 11 accommodating cavities, 12 conical gates, 13 cavities, 2 material returning grooves, 21 step surfaces, 3 valve rods, 31 bosses and 32 conical valve needles.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings, and it is to be understood that the described embodiments are only some embodiments, but not all embodiments of the present invention.

Example (b):

referring to fig. 2-4, the present embodiment is a hot runner valve needle structure of an injection mold, including a mold core 1 having an accommodating cavity 11, a tapered gate 12 disposed at the bottom of the accommodating cavity 11, a plurality of material return grooves 2 disposed at the periphery of the tapered gate 12, and a valve body disposed in the accommodating cavity 11 for gate sealing; the valve body comprises a valve rod 3, a boss 31 arranged at the bottom of the valve rod 3 and a conical valve needle 32 arranged at the bottom of the boss 31, wherein the boss 31 is erected on the material return groove 2, and the conical valve needle 32 is correspondingly matched with the conical pouring gate 12.

The tapered gate 12 is wide at the top and narrow at the bottom, and the opening with the larger radial dimension faces the accommodating cavity 11, and the opening with the smaller radial dimension faces the cavity 13.

The accommodating cavity 11 is in a conical cylindrical structure, a feed back groove 2 in a quartering position is arranged at the bottom of the accommodating cavity 11, and the inner end of the feed back groove 2 is communicated with the conical gate 12.

The material return grooves 2 extend outwards in a fan-shaped structure from the end part of the conical gate 12, and a step surface 21 is formed between every two adjacent material return grooves 2.

The valve rod 3 is vertically arranged in the accommodating cavity 11, the conical valve needle 32 is correspondingly inserted into the conical gate 12, and the boss 31 is correspondingly attached to the step surface 21.

In the embodiment, the bottom of the conical valve needle 32 and the bottom of the conical gate 12 are sealed, the thermal expansion length of the conical valve needle 32 is not influenced by the change of the glue injection temperature, the boss 31 and the step surface 21 are stably positioned and are arranged on the material return groove 2, the positioning is accurate, and the gate sealing is in place; the material return groove 2 extends outwards from the end part of the conical pouring gate 12 in a fan-shaped structure, so that the excessive colloid in the glue sealing process is effectively stored, and the pouring gate is prevented from flashing or the mold core is prevented from being cracked; the conical valve needle 32 does not generate friction with the die core 1, the processing difficulty of a hot runner system and a die is reduced, and the service lives of the conical valve needle 32 and the die are prolonged.

What has been described above are only some embodiments of the invention. For those skilled in the art, without departing from the inventive concept, several modifications and improvements can be made, which are within the scope of the invention.

Claims

1. Injection mould hot runner needle structure, including the mould benevolence that has the holding cavity, its characterized in that: a conical pouring gate is arranged at the bottom of the accommodating cavity, a plurality of material returning grooves are formed in the periphery of the conical pouring gate, and a valve body for pouring gate sealing glue is arranged in the accommodating cavity; the valve body comprises a valve rod, a boss arranged at the bottom of the valve rod and a conical valve needle arranged at the bottom of the boss, wherein the boss is arranged on the material return groove, and the conical valve needle is correspondingly matched with the conical pouring gate.

2. The injection mold hot runner valve pin structure of claim 1, wherein: the tapered gate is of a structure with a wide upper part and a narrow lower part, the opening with the larger radial size faces the accommodating cavity, and the opening with the smaller radial size faces the cavity.

3. The injection mold hot runner valve pin structure of claim 1, wherein: and a material return groove in a quartering position is arranged at the bottom of the accommodating cavity, and the inner end of the material return groove is communicated with the conical pouring gate.

4. The injection mold hot runner valve pin structure of claim 1, wherein: the feed back groove extends outwards in a fan-shaped structure from the end part of the conical pouring gate.

5. The injection mold hot runner valve pin structure of claim 1, wherein: and a step surface is formed between the adjacent feed back grooves.

6. The injection mold hot runner valve pin structure of claim 5, wherein: the valve rod is vertically arranged in the accommodating cavity, the conical valve needle is correspondingly inserted into the conical pouring gate, and the boss is correspondingly attached to the step surface.