CN111571952A

CN111571952A - Movable hot runner structure

Info

Publication number: CN111571952A
Application number: CN202010422907.2A
Authority: CN
Inventors: 吴惠权; 张建群; 张宇昂; 戴飞军; 何可梅
Original assignee: Zhongshan Liqun Precision Industry Co Ltd
Current assignee: Zhongshan Liqun Precision Industry Co Ltd
Priority date: 2020-05-19
Filing date: 2020-05-19
Publication date: 2020-08-25

Abstract

The invention relates to a movable hot runner structure, which comprises an upper fixing plate, a hot runner plate, a plate A and a hot nozzle, wherein the upper fixing plate is connected with the hot runner plate; the A plate and the hot runner plate are connected in a relatively movable manner; the first end of the hot nozzle is fixed on the hot runner plate and is communicated with the hot runner, the hot nozzle movably penetrates through the plate A, and the second end of the hot nozzle is communicated with the forming cavity of the plate A. The movable hot runner structure can protect the hot nozzle and is suitable for products needing the front mold sliding block.

Description

Movable hot runner structure

Technical Field

The invention relates to the technical field of injection molds, in particular to a movable hot runner structure.

Background

The runner refers to a part between a mold inlet and a product gate, and a cold runner structure and a hot runner structure are common mold runner modes for injection molding. The cold runner structure is easy to use, but the problem of raw material waste and the like is caused because the condensate of the cold runner needs to be removed. The hot runner structure keeps the plastic of runner and runner in the molten state through the heating, generally need not take out the congeals material, can practice thrift raw and other materials, and the product appearance of production is superior to the cold runner.

As shown in fig. 1, the conventional hot runner structure generally has an upper fixing plate 1, a hot runner plate 2, an a plate 3 and a hot nozzle 4, the hot runner and the hot nozzle 4 are arranged in the fixing plate 1, the hot runner plate 2 and the a plate 3, and the fixing plate 1, the hot runner plate 2 and the a plate 3 need to be locked and connected and cannot move. Because the hot nozzle part belongs to a hard and brittle production part, the hot nozzle is easily knocked to cause scrapping when the A plate and the B plate are opened and closed. In addition, since the fixed plate 1, the hot runner plate 2 and the a plate 3 are locked, a product requiring the use of the front mold slide cannot use the hot runner structure.

Disclosure of Invention

Aiming at the defects of the prior art, the invention aims to provide a movable hot runner structure which can protect a hot nozzle and is suitable for a front mold slide block.

In order to achieve the purpose of the invention, the invention provides a movable hot runner structure, which comprises an upper fixing plate, a hot runner plate, an A plate and a hot nozzle, wherein the upper fixing plate is connected with the hot runner plate, and hot runners are fixed on the upper fixing plate and the hot runner plate; the A plate and the hot runner plate are connected in a relatively movable manner; the first end of the hot nozzle is fixed on the hot runner plate, the hot nozzle movably penetrates through the plate A, and the second end of the hot nozzle is communicated with the forming cavity of the plate A.

The further technical scheme is that counter bores are formed in the plate A, through holes are formed in the bottoms of the counter bores, equal-height screws penetrate through the counter bores and the through holes and are fixedly connected with the hot runner plate, and the equal-height screws are used for controlling the separation stroke of the plate A relative to the hot runner plate.

The further technical scheme is that a bushing is sleeved outside the hot nozzle and extends from the first end of the hot nozzle to the second end of the hot nozzle; the insert sleeve is fixedly connected with the hot runner plate.

The further technical scheme is that the plate A is provided with a through hole for the bushing to pass through.

The further technical scheme is that the movable runner structure further comprises a front mold sliding block, and the mold opening stroke of the front mold sliding block is equal to the separation stroke of the A plate relative to the hot runner plate.

The movable runner structure further comprises a plate B, and a forming cavity is formed when the plate A, the plate B and the front mold slide block are assembled; and after the A plate is separated from the hot runner plate, the B plate is separated from the A plate.

The technical scheme is that a connecting seat is arranged at the first end of the nozzle and is fixed on the hot runner plate through a threaded fastener.

The further technical scheme is that a mounting groove is formed in the hot runner plate, and the connecting seat is mounted on the mounting groove.

Compared with the prior art, the invention has the beneficial effects that:

the plate A in the movable hot runner structure can be separated relative to the hot runner plate, so that the hot nozzle is protected, the service life of the hot nozzle is prolonged, the possibility of using the front mold sliding block is provided, and more products are suitable for injection molding by using the hot runner. The invention completely solves the defect that the product with the front mould slide block structure can not use the hot runner, retains the advantage that the hot runner does not generate waste materials, improves the production efficiency, reduces the production cost of plastic raw materials and increases the use utilization rate of the raw materials.

Drawings

Fig. 1 is a schematic structural view of a conventional hot runner structure.

Fig. 2 is a schematic structural view of a cold runner structure with a pre-drawing die slide as a comparative example.

Fig. 3 is a schematic structural view of an embodiment of the movable hot runner structure of the present invention.

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

Detailed Description

As shown in fig. 2, as a comparative example of the embodiment of the movable hot runner structure of the present invention, the existing cold runner structure with a front mold block drawing includes an upper fixing plate 11, an a plate 12, a front mold block 13, a B plate 14, and a slant rail 15. One end of the inclined guide rail 15 is fixed on the fixing plate 11, one end of the front mold sliding block 13 is connected on the A plate 12 in a sliding mode, and the other end of the front mold sliding block is matched with the guide rail 15 in a sliding mode. When the mold is opened, the upper fixed plate 11 is separated from the A plate 12, and the front mold slide block 13 moves along the inclined guide rail 15, so that the front mold slide block 13 simultaneously slides along the A plate 12, and the mold opening of the front mold slide block 13 is realized. The a plate 12 is then separated from the B plate 14 and the ejector pins eject the product through the B plate 14. The die with the structure causes overlong stub bars, generates a large amount of water gap waste materials and increases the production cost.

As shown in fig. 3, the movable hot runner structure of the present invention includes an upper fixing plate 20, a hot runner plate 30, an a plate 40, and a hot nozzle 50. The upper fixing plate 20 is connected to the hot runner plate 30, for example, by screws. The upper fixing plate 20 and the hot runner plate 30 are fixed with hot runners, and the hot runners may be disposed in the upper fixing plate 20 and the hot runner plate 30.

In the present embodiment, the a plate 40 and the hot runner plate 30 are connected to be relatively movable. Specifically, a counter bore 41 is arranged on the a plate 40, a through hole 42 is arranged at the bottom of the counter bore 41, a contour screw 43 penetrates through the counter bore 41 and the through hole 42 and is fixedly connected with the hot runner plate 30, and the contour screw 43 is used for controlling the separation stroke of the a plate 40 relative to the hot runner plate 30. That is, when the a plate 40 is in contact with the hot runner plate 30, the head of the contour screw 43 is separated from the bottom of the counterbore 41, and when the a plate 40 is separated from the hot runner plate 30, the head of the contour screw 43 is in contact with the bottom of the counterbore 41, thereby achieving stroke limitation.

In this embodiment, the first end of the hot nozzle 50 is fixed to the hot runner plate 30 and communicates with the mold inlet through the runner. Specifically, the nozzle 50 is provided at a first end thereof with a coupling seat 51, and the coupling seat 51 is fixed to the hot runner plate 30 by a threaded fastener 52. The hot runner plate 30 is provided with a mounting groove 31, and the connecting seat 51 is mounted on the mounting groove 31 for positioning and mounting.

In this embodiment, the hot tip 50 is movable through the A plate 40, with the second end of the hot tip 50 communicating with the mold cavity of the A plate 40. Specifically, the hot nozzle 50 is externally sleeved with the insert sleeve 53, the insert sleeve 53 is fixedly connected with the hot runner plate 30, the insert sleeve 53 extends from the first end of the hot nozzle 50 to the second end of the hot nozzle 50, the effect of protecting the hot nozzle 50 is achieved, meanwhile, the heat preservation effect is achieved, and the hot nozzle 50 is prevented from being cooled rapidly after being separated from the A plate 40. The a plate 40 is provided with a through hole 44 through which the insert 53 passes, preventing the insert 53 from being worn.

The movable hot runner structure of the present embodiment further includes a front mold slider 60, and the mold opening stroke of the front mold slider 60 is equal to the separation stroke of the a plate 40 with respect to the hot runner plate 30. For example, the first end of the front mold slider 60 is connected to the hot runner plate 30 so as to be laterally movable along the plate surface of the hot runner plate 30. The second end of the front mold slide 60 may have an inclined rail that extends in a direction away from the face of the hot runner plate 30 and also extends laterally in the direction of ejection of the front mold slide 60. The a-plate 40 may be provided with transverse rails 45, the transverse rails 45 being provided with slidable slide blocks, one end of which is movably connected to a tilt rail (not shown in the figures). When the a plate 40 is separated from the hot runner plate 30, the slide block moves in a direction away from the surface of the hot runner plate 30, and the front mold slide block 60 moves laterally under the limiting action of the inclined guide rail and the lateral guide rail 45, thereby realizing the mold opening of the front mold slide block 60. In other embodiments, the front mold shoe 60 may have a similar configuration to that described above in the comparative example for mating with the diagonal rail, or other configurations conventional in the art may be used.

The movable flow channel structure of the present embodiment further includes a B plate. Specifically, during mold closing, the B plate moves towards the a plate 40, and after the a plate 40 and the B plate are closed, the B plate pushes the a plate 40 to move towards the hot runner plate 30, the front mold slide 60 is reset, and when the a plate 40, the B plate and the front mold slide 60 contact the hot runner plate 30, a forming cavity is formed by the a plate 40, the B plate and the front mold slide 60, and the second end of the hot nozzle 50 is also aligned with the forming cavity. During demolding, the A plate 40 is separated from the hot runner plate, the second end of the hot nozzle 50 is retreated relative to the A plate 40, the front mold slider 60 is opened, and the B plate is separated from the A plate 40 after the A plate 40 slides to a separation stroke. It can be seen that the embodiment does not have the condition that the B plate moves towards the nozzle 50 directly when being clamped, the nozzle 50 is protected, and the possibility of using the front mold slide block 60 is provided, so that more products are suitable for hot runner injection molding.

Finally, it should be emphasized that the above-described embodiments are merely preferred examples of the invention, which is not intended to limit the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The utility model provides a movable type hot runner structure which characterized in that:

the movable runner structure comprises an upper fixing plate, a hot runner plate, an A plate and a hot nozzle, wherein the upper fixing plate is connected with the hot runner plate, and hot runners are fixed on the upper fixing plate and the hot runner plate;

the A plate and the hot runner plate are connected in a relatively movable manner;

the first end of the hot nozzle is fixed on the hot runner plate, the hot nozzle movably penetrates through the plate A, and the second end of the hot nozzle is communicated with the forming cavity of the plate A.

2. The movable hot runner structure of claim 1, wherein:

the plate A is provided with a counter bore, the bottom of the counter bore is provided with a through hole, an equal-height screw penetrates through the counter bore and the through hole and is fixedly connected with the hot runner plate, and the equal-height screw is used for controlling the separation stroke of the plate A relative to the hot runner plate.

3. The movable hot runner structure as claimed in claim 1 or 2, wherein:

the hot nozzle is sleeved with an insert sleeve, and the insert sleeve extends from the first end of the hot nozzle to the second end of the hot nozzle; the insert sleeve is fixedly connected with the hot runner plate.

4. The movable hot runner structure of claim 3, wherein:

the A plate is provided with a through hole for the bushing to pass through.

5. The movable hot runner structure as claimed in claim 1 or 2, wherein:

the movable runner structure further comprises a front die slide block, and the die opening stroke of the front die slide block is equal to the separation stroke of the A plate relative to the hot runner plate.

6. The movable hot runner structure of claim 5, wherein:

the movable runner structure also comprises a plate B, and a forming cavity is formed when the plate A, the plate B and the front mold slide block are assembled; and after the A plate is separated from the hot runner plate, the B plate is separated from the A plate.

7. The movable hot runner structure as claimed in claim 1 or 2, wherein:

the first end of the nozzle is provided with a connecting seat, and the connecting seat is fixed on the hot runner plate through a threaded fastener.

8. The movable hot runner structure of claim 7, wherein:

the hot runner plate is provided with a mounting groove, and the connecting seat is mounted on the mounting groove.