CN212602968U - Injection molding machine - Google Patents

Abstract

An injection molding machine, characterized in that the head (1) of the extruder barrel provides a connection between the plasticizing unit and the nozzle (2), that a shut-off valve (23) is provided between the head (1) of the extruder barrel and the nozzle (2), that the nozzle (2) comprises a nozzle body (3) and a detachable nozzle tip (4), that the nozzle (2) is provided with a melt channel (6), that the melt channel (6) extends through the nozzle body (3) and the nozzle tip (4), that the melt channel extends from an inlet (22) through the melt channel (6), and that molten resin is delivered under pressure to an injection port (5); a melt guide (7) for guiding the molten resin is arranged in a melt channel (6) extending through the nozzle body (3), the melt guide (7) being attached to a support (8), the support (8) being detachably connected to the nozzle head (4), the melt channel (6) accommodating an annular filter (9) having an opening in the largest area of the nozzle body (3).

Description

Injection molding machine

Technical Field

The utility model relates to an injection molding machine belongs to industrial manufacturing technical field.

Background

In injection molding of thermoplastic resin, it is common practice to press the needle tip of the oil jet against the gate bush of the injection mold by a hydraulically driven press fitting method in order to avoid resin leakage at the interface between the injection nozzle and the gate bush during the mold filling stage and the pressure holding stage. For the subsequent cooling phase, the oil jet and the sprue bushing are separated by the take-off stroke of the press-fit assembly, for which purpose the molten resin present in the oil jet must be depressurized. When using a hot runner system, the molten resin in the hot runner must also be depressurized to obtain a non-injection molded product.

SUMMERY OF THE UTILITY MODEL

In order to solve the defects and shortcomings, the utility model provides an injection molding machine.

The utility model discloses a solve the technical scheme that technical problem adopted as follows:

an injection molding machine, wherein a head of an extruder barrel provides a connection between a plasticizing unit and a nozzle, a shut-off valve is provided between the head of the extruder barrel and the nozzle, the nozzle comprises a nozzle body and a removable nozzle head, the nozzle is provided with a melt channel extending through the nozzle body and the nozzle head, the melt channel extends from an inlet through the melt channel, and molten resin is delivered under pressure to an injection port; providing a melt guide for guiding molten resin in a melt channel extending through the nozzle body, the melt guide being attached to a support piece, the support piece being detachably connected to the nozzle head, the melt channel accommodating, in a maximum area of the nozzle body, an annular filter having an opening, the opening of the filter being configured such that molten resin can pass through the filter from the inside to the outside and trap contaminants entrained therein; the filter is respectively provided with a second stop block and a third stop block at two ends, the second stop block and the third stop block are tightly connected with the filter and play a role in supporting, and the molten resin passes through the filter but not the impermeable stop blocks to provide effective filtration; two ends of the melt guiding piece are respectively provided with a first stop block and a second stop block which correspond to the second stop block and the third stop block; the filter is movable, and the second block and the third block can move between the first block and the second block of the filter; the nozzle head is mounted on the nozzle body, the support part is connected with the nozzle head through threads, and the melt guide part, the filter and the support part can be together extracted from the nozzle head; in the injection stage, molten resin is conveyed from the cylinder of the extruder to the injection port under pressure, the filter is moved in the direction of an arrow by the flow of the molten resin, the movement of the filter is limited within a short distance, after the movement along the short distance, the stop II of the filter, which faces the injection port, abuts against the stop of the melt guide, and the movement of the filter is stopped; the stopper and the stopper two are firmly pressed against each other, an inlet of the filter is provided for the molten resin to enter the passage, and the molten resin is pushed from the cylindrical portion inside the filter into the annular portion outside the filter through the opening of the filter; during the injection phase, the molten resin moves along arrow one, the annular portion of the filter exterior is connected by a plurality of separate guide channels or in a plurality of directions to the melt channel on the side of the melt guide facing the sprue, via a funnel-shaped guide which is intercepted by radially arranged ribs and which connects the melt guide for guiding the molten resin to the support; similarly to the injection phase, the flow of molten resin also causes the filter to move with the molten resin during the depressurization phase, in which case the filter moves in the direction of arrow two; at the beginning of the decompression phase, the movement of the filter is again limited to a short distance, with the end of the block three of the filter abutting against the block one of the melt guide facing the extruder barrel, a gap being formed between the block and the block two, due to the displacement of the filter, which allows the molten resin to flow from the annular portion outside the filter into the cylindrical portion in the filter, the molten resin not flowing through the filter but through the gap between the block and the block two; arrow three indicates the path followed by the molten resin along the melt channel during the decompression phase, i.e. the extruder barrel, part of which extends from the side of the melt guide facing the injection opening to the side of the melt guide facing the melt channel, in such a way that the molten resin on the side of the melt guide facing the extruder barrel is guided by the melt channel through a plurality of separate guide channels or through a funnel-shaped guide which is connected to the support by radially arranged intercepting ribs; in the decompression phase, the molten resin is caused to bypass the filter without passing through the filter; in the decompression phase, the molten resin enters the cylindrical part in the filter through the gap provided by the stop block and the second stop block, and after entering the cylindrical part in the filter, the molten resin is guided along the inner surface of the filter until the molten resin enters the channel of the melt guide.

The utility model discloses the beneficial effect who reaches is: 1. the filter can effectively filter impurities in the molten resin, so that the purity of the casting mould material is improved; 2. the molten resin bypasses the filter by moving the filter in the decompression stage, thereby increasing the decompression speed and shortening the decompression time; 3. each part of the nozzle main body can be detached, and the maintenance, the maintenance and the cleaning of each part are facilitated.

Drawings

The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention, and together with the description serve to explain the invention and not to limit the invention. In the drawings:

FIG. 1 is a cross-sectional view of the nozzle of the present invention inserted therein;

figure 2 is a cross-sectional view of the nozzle of the present invention in isolation;

FIG. 3 is a flow of molten resin in the nozzle during the injection stage;

fig. 4 shows the flow of the molten resin in the nozzle during the decompression phase.

Detailed Description

The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "upper", "lower", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Furthermore, the technical features mentioned in the different embodiments of the invention described below can be combined with each other as long as they do not conflict with each other.

Example 1

As shown in fig. 1 to 4, the head 1 of the extruder barrel provides a connection between the plasticizing unit and the nozzle 2, a shut-off valve 23 is provided between the head 1 of the extruder barrel and the nozzle 2, the nozzle 2 comprises a nozzle body 3 and a detachable nozzle head 4, the nozzle 2 is provided with a melt channel 6, the melt channel 6 extends through the nozzle body 3 and the nozzle head 4, the melt channel extends from the inlet 22 through the melt channel 6, and molten resin is delivered under pressure to the sprue 5; in a melt channel 6 extending through the nozzle body 3, a melt guide 7 for guiding the molten resin is provided, the melt guide 7 being attached to a support 8, the support 8 being detachably connected to the nozzle head 4, the melt channel 6 accommodating, in a maximum region of the nozzle body 3, an annular filter 9 having an opening, the opening of the filter 9 being configured such that the molten resin can pass through the filter from the inside to the outside and trap contaminants entrained therein; the filter 9 has a second stopper 12 and a third stopper 13 at both ends thereof, respectively, the second stopper 12 and the third stopper 13 being tightly coupled to the filter 9 and serving as a support, and the molten resin being passed through the filter 9 rather than through the impermeable stoppers to provide effective filtration; a stop block 10 and a stop block 11 corresponding to the second stop block 12 and the third stop block 13 are respectively arranged at the two ends of the melt guide 7; the filter 9 is movable and the second 12 and third 13 stops are movable between the first 11 and second 10 stops of the filter 9; the nozzle head 4 is mounted on the nozzle body 3, when the nozzle head 4 is detached from the nozzle body 3, the nozzle head 4 with the melt guide 7 connected thereto and the filter 9 slidably supported by the melt guide 7 can be withdrawn from the nozzle body 3, and the support member 8 is screwed to the nozzle head 4, so that the melt guide 7 together with the filter 9 and the support member 8 can be withdrawn from the nozzle head 4, thereby facilitating cleaning of the components therein; during the injection phase, the molten resin is conveyed under pressure from the extruder barrel towards the sprue 5, the flow of the molten resin moving the filter 9 in the direction of the arrow 17, which thus indicates the direction of movement of the filter 9 at the start of the injection phase, whereas the movement of the filter 9 is limited to a short distance along which, after moving, the second stop 12 of the filter 9 towards the sprue 5 abuts against the stop 10 of the melt guide 7, in such a way that the movement of the filter 9 is stopped; since the stopper 10 and the second stopper 12 are firmly pressed against each other, thereby eliminating the possibility of the molten resin leaking therebetween, the cylindrical portion 15 inside the filter 9 is positioned in such a manner as to leave only one inlet of the filter 9 for the molten resin to enter, so that the molten resin is pushed from the cylindrical portion 15 inside the filter 9 into the annular portion 16 outside the filter 9 through the opening of the filter 9; during its passage through the filter 9, the contaminants contained in the molten resin are either removed by the filter 9 and adhere thereto, or the concentration of the contaminants contained in the molten resin increases in the cylindrical portion 15 inside the filter 9, ensuring that the contaminants cannot pass through the filter 9 and thus cannot enter the mold; during the injection phase, the molten resin moves along arrow one 19, the annular portion 16 outside the filter 9 is connected to the melt channel 6 on the side of the melt guide 7 facing the sprue 5 by means of a plurality of separate guide channels or in a plurality of directions, via funnel-shaped guides which are intercepted by radially arranged ribs and which connect the melt guide 7 for guiding the molten resin to the support 8; similarly to the injection phase, the flow of molten resin also causes the filter 9 to move together with the molten resin in the decompression phase, wherein, in this case, the filter 9 moves in the direction of the arrow two 18, and therefore the arrow two 18 indicates the movement direction of the filter 9; at the beginning of the decompression phase, the movement of the filter 9 is again limited to a short distance, with the end of the block three 13 of the filter 9 abutting against the block one 11 of the melt guide 7 facing the extruder barrel, a gap being formed between the block 10 and the block two 12 due to the displacement of the filter 9, which allows the molten resin to flow from the annular portion 16 outside the filter 9 into the cylindrical portion 15 in the filter 9, the molten resin not flowing through the filter 9, but flowing through the gap between the block 10 and the block two 12; arrow three 20 indicates the path followed by the molten resin along the melt channel 6 during the decompression phase, i.e. the extruder barrel which extends in part from the side of the melt guide 7 facing the injection opening 5 to the side of the melt guide 7 facing the melt channel, in such a way that the molten resin on the side of the melt guide 7 facing the extruder barrel is guided by the melt channel 6 through a plurality of separate guide channels or through a funnel-shaped guide which is connected by radially arranged intercepting ribs to the melt guide 7 to the support 8; therefore, in the decompression stage, the molten resin is caused to bypass the filter 9 without passing through the filter 9, thereby increasing the decompression speed and shortening the decompression time, which reduces the entire cycle time, thereby reducing the manufacturing cost of the injection-molded article; therefore, in the decompression phase, the molten resin enters the cylindrical portion 15 inside the filter 9 through the clearance provided by the stopper 10 and the second stopper 12, and after entering the cylindrical portion 15 inside the filter 9, the molten resin is guided along the inner surface of the filter 9 until it enters to the passage 14 of the melt guide 7, so that the contaminants 21 that have been concentrated in the molten resin in the cylindrical portion 15 inside the filter 9 are pulled back together with the molten resin, and the contaminants that have surfaced on the filter 9 are also collected and discharged; if the filter 9 becomes clogged after a reasonable period of time, or if the filter 9 has too great a resistance to the flow of molten resin, the filter 9 must be cleaned, and in order to clean the filter 9, it is merely necessary to remove the nozzle head 4 from the nozzle body 3, remove the nozzle head 4 from the nozzle body 3 allowing the melt guide 7 together with the filter 9 connected to the nozzle head 4 to be withdrawn from the melt channel 6, extending through the nozzle body 3, after which the now freely accessible filter 9 can be easily cleaned and released from any filtered contaminants.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing embodiments, or equivalents may be substituted for elements thereof. 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)

1. An injection molding machine, wherein a head of an extruder barrel provides a connection between a plasticizing unit and a nozzle, a shut-off valve is provided between the head of the extruder barrel and the nozzle, the nozzle comprises a nozzle body and a removable nozzle head, the nozzle is provided with a melt channel extending through the nozzle body and the nozzle head, the melt channel extends from an inlet through the melt channel, and molten resin is delivered under pressure to an injection port; providing a melt guide for guiding molten resin in a melt channel extending through the nozzle body, the melt guide being attached to a support piece, the support piece being detachably connected to the nozzle head, the melt channel accommodating, in a maximum area of the nozzle body, an annular filter having an opening, the opening of the filter being configured such that molten resin can pass through the filter from the inside to the outside and trap contaminants entrained therein; the filter is respectively provided with a second stop block and a third stop block at two ends, the second stop block and the third stop block are tightly connected with the filter and play a role in supporting, and the molten resin passes through the filter but not the impermeable stop blocks to provide effective filtration; two ends of the melt guiding piece are respectively provided with a first stop block and a second stop block which correspond to the second stop block and the third stop block; the filter is movable, and the second block and the third block can move between the first block and the second block of the filter; the nozzle head is mounted on the nozzle body, the support member is in threaded connection with the nozzle head, and the melt guide together with the filter and the support member is extractable from the nozzle head.

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