CN111070583A

CN111070583A - Hot runner routing mechanism

Info

Publication number: CN111070583A
Application number: CN201911338880.2A
Authority: CN
Inventors: 向立江; 吴广龙
Original assignee: Suzhou Osmu Hot Runner Technology Co Ltd
Current assignee: Suzhou Osmu Hot Runner Technology Co Ltd
Priority date: 2019-12-23
Filing date: 2019-12-23
Publication date: 2020-04-28

Abstract

The invention discloses a routing mechanism of a hot runner, which comprises a cover plate, a runner plate and a mold core plate, wherein the inner side of the cover plate is provided with the butted runner plate, the cover plate below the runner plate is provided with a splitter plate, the inner side of the splitter plate is provided with a hot nozzle in a butt joint manner, the inner side of the runner plate is provided with the mold core plate, a hot nozzle line channel is arranged between the mold core plate and the runner plate, and the hot nozzle line channel is arranged on one side of the runner plate, which faces the mold core plate. Compared with the existing hot runner wiring mode, the hot runner wiring method has the advantages that the mold is far away from the high-temperature splitter plate, so that the temperature of the runner plate is effectively reduced when the molding temperature of the hot runner is about 380 ℃, the temperature of the back of the runner plate is ensured to be 150-180 ℃, the power line can be effectively ensured to work at the temperature for a long time, the heater or the temperature sensing line can be taken out for replacement and installation only by separating the mold from the runner plate and the mold core plate, the hot runner system does not need to be disassembled, and the complexity of workers in maintenance is reduced.

Description

Hot runner routing mechanism

Technical Field

The invention relates to the technical field of hot runners, in particular to a routing mechanism of a hot runner.

Background

Hot Runner (Hot Runner Systems) is a heating element system used in injection molds to inject molten plastic pellets into the cavity of the mold, and is a new configuration in which the runners and runners of a conventional mold or a three-plate mold are heated, eliminating the need to remove the runners and runners for each molding operation.

The hot runner ensures that the plastic of the runner and the sprue keeps a molten state by a heating method, and because the heating rod and the heating ring are arranged near or in the center of the runner, the whole runner from the nozzle outlet of the injection molding machine to the sprue is in a high-temperature state, so that the plastic in the runner keeps molten, the runner does not need to be opened to take out the condensate after the machine is stopped, and the runner only needs to be heated to the required temperature when the machine is restarted, so the hot runner process is sometimes called as a heat collecting pipe system or a runner-free mold.

The hot runner system generally comprises a hot nozzle, a splitter plate, a temperature control box, accessories and the like, wherein the hot nozzle generally comprises two types: the hot nozzle forms directly determine the selection of the hot runner system and the manufacture of the mould, so the hot runner system is divided into the open hot runner system and the needle valve hot runner system, the splitter plate is adopted in multi-cavity or multi-point feeding and single-point feeding of the mould but offset material level, the material usually adopts P20 or H13, the splitter plate is divided into two categories of standard and non-standard, the structural form is mainly determined by the distribution condition of the cavity on the mould, the arrangement of the nozzles and the positions of the gates, the temperature control box comprises a host machine, cables, connectors, a wiring male and female socket and the like, and the hot runner accessories usually comprise: heaters, thermocouples, runner sealing rings, connectors, junction boxes and the like.

In the routing mechanism of the existing hot runner:

1. for hot runners with high molding temperature, such as PFA/PEEK molding temperature is more than 360 degrees, power lines of a conventional hot nozzle heater and a temperature sensing line are extended from the inside of a runner plate to the outside of a mold, the lines are sleeved by a high-temperature sleeve, and the outer skin of the power line is often baked to be damaged under a high-temperature environment for a long time, so that problems occur.

2. For a multipoint hot runner system, if a hot nozzle heater or a temperature sensing wire is damaged in a conventional wiring mode, the whole hot runner system needs to be disassembled for maintenance and replacement, which is more tedious and wastes more time, so that the abnormality is easily caused during the operation.

Disclosure of Invention

The present invention is directed to a routing mechanism of a hot runner to solve the above technical problems.

The invention adopts the following technical scheme:

the utility model provides a hot runner walk line mechanism, includes apron, runner plate and mould benevolence board, the inboard of apron is equipped with rather than the runner plate of butt joint, runner plate below install with the flow distribution plate of cover connection, hot mouth is installed in the inboard butt joint of flow distribution plate, the inboard of runner plate is equipped with mould benevolence board, mould benevolence board with be equipped with hot mouth line between the runner plate and say, hot mouth line say set up in the runner plate orientation one side of mould benevolence board.

Furthermore, a cushion block is arranged between the runner plate and the mold core plate, a main runner nozzle is arranged between the cushion block and the runner plate, and a central positioning piece is assembled at the top of the main runner nozzle.

Furthermore, a runner plate temperature thermocouple, a pressure-bearing ring and an electric heating bent pipe are assembled at the position of the runner plate close to the flow distribution plate.

Further, in the structure of the hot runner system, air is adopted between the adjusting pad and the distributing nozzle and between the adjusting pad and the mould for heat insulation, the distance is controlled by the adjusting pad, and the adjusting pad is 8-10 mm.

Furthermore, the hot runner main runner is directly fastened by fine threads instead of the original screw fastening mode.

Compared with the prior art, the technical scheme of the invention has the following beneficial effects:

1. after adjustment, due to the fact that the mold is cooled and is far away from the high-temperature splitter plate, when the forming temperature of the hot runner is about 380 ℃, the temperature of the runner plate is effectively reduced, the temperature of the back of the runner plate is guaranteed to be 150-180 ℃, and therefore the power line can be effectively guaranteed to work at the temperature for a long time, strain is reduced, and the service life is prolonged;

2. the hot runner line changes the back of runner plate into, if need change hot mouth heater or temperature sensing line when, only need to the mould from the runner plate with mould benevolence between separately just can take out heater or temperature sensing line and change the installation, need not tear hot runner system open, reduced the loaded down with trivial details nature of staff when overhauing, the convenience when having increased the operation has guaranteed the improvement effect of hot runner line.

Drawings

FIG. 1 is a schematic structural diagram of a routing mechanism of a hot runner in the prior art;

fig. 2 is a schematic structural diagram of a routing mechanism of a hot runner according to the present invention.

In the figure: 1. a flow distribution plate; 2. a cover plate; 3. a runner plate; 4. a central positioning member; 401. a main runner nozzle; 5. a core plate; 501. cushion blocks; 6. a hot nozzle line; 7. and (4) heating the mouth.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front", "rear", "both ends", "one end", "the other end", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "connected," and the like are to be construed broadly, such as "connected," which may be 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 meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Example 1

Referring to fig. 1, an embodiment of the present invention: the utility model provides a hot runner walk line mechanism, including apron 2, runner plate 3 and mould benevolence board 5, the inboard of apron 2 is equipped with rather than the runner plate 3 of butt joint, runner plate 3 below is installed and is lapped 2 branches board 1 of being connected, hot nozzle 7 is installed in the inboard butt joint of branch board 1, the inboard of runner plate 3 is equipped with mould benevolence board 5, be equipped with hot nozzle line way 6 between mould benevolence board and the runner plate 3, hot nozzle line way 6 sets up in one side (the back of runner plate 3 promptly) of runner plate 3 towards mould benevolence board 5. The hot nozzle line channel 6 is arranged on the back of the runner plate 3 to achieve the improvement effect of improving the routing of the hot runner, the mold is far away from the high-temperature splitter plate, when the forming temperature is about 380 ℃, the temperature of the back of the runner plate is only 150 ℃ -180 ℃, a power line can work for a long time at the temperature, if the hot nozzle heater or the temperature sensing line needs to be replaced, the heater or the temperature sensing line can be taken out for replacement and installation only by separating the mold from the runner plate and the mold core plate, the hot runner system does not need to be disassembled, the convenience and the rapidness are realized, the butt-jointed runner plate 3 is arranged on the inner side of the cover plate 2, the splitter plate 1 is arranged on the cover plate 2 below the runner plate 3 through an assembled bolt structure, and the hot nozzle 7 is installed on the inner side of the.

Further, be equipped with cushion 501 between runner plate 3 and the mould benevolence board 5, cushion 501 has played the effect of accepting the linking, has guaranteed the laminating nature between runner plate 3 and the mould benevolence board 5 during the operation, is equipped with sprue nozzle 401 between cushion 501 and the runner plate 3, and sprue nozzle 401 has guaranteed the basic operation of hot runner, has realized the injection of thermal current, and the top mounting of sprue nozzle 401 has central positioning element 4.

Furthermore, a runner plate temperature thermocouple, a pressure-bearing ring and an electric heating bent pipe are assembled at the position, close to the flow distribution plate 1, of the runner plate 3, the temperature thermocouple and the electric heating bent pipe are electrically connected with an external control mechanism through matched operation wires, so that a worker can conveniently detect and control the temperature inside the hot runner, the worker can master the operation in real time, the pressure-bearing ring can keep the pressure-bearing effect of the runner plate 3, and the pressure loss of internal elements is reduced.

Furthermore, in the structure of the runner system, air is adopted for heat insulation between the adjusting pad and the material distributing nozzle and the mold, the distance is controlled by the adjusting pad, and the adjusting pad is 8-10mm, so that the heat loss between the adjusting pad and the material distributing nozzle and the mold can be better reduced, the temperature inside the runner system is ensured, and the heat insulation and operation requirements between the hot runner body and the mold can be better ensured by controlling the thickness of the adjusting pad.

Furthermore, the hot runner main runner is changed into a direct form of fastening by fine threads from the original screw fastening, so that the fitting performance and firmness of the main runner after installation are effectively guaranteed, the condition that the installation structure is loosened due to long-time operation of the main runner is avoided or reduced, and the fastening effect is improved.

Example 2

First, hot runner technology feedback

1. Saving plastic raw material

Because the hot runner has no condensate or a small cold material handle, the sprue material of the cold runner is basically not required to be recovered, especially the plastic product which has high price and cannot be processed by using the return material can greatly save the cost, and the hot runner can be recovered if the hot runner is applied to normal production for 2-3 months.

2. Improve the product quality

Compare with the three-plate mold of two split surfaces, the plastics solution temperature in the hot runner system is difficult for descending, keeps the constant humidity, need not like cold runner mould to improve the injection temperature and compensate the decline of plastics solution temperature, so the plastics solution in the hot runner is changeed and flows, to large-scale, the thin wall, the plastic product that is difficult to process is changeed the shaping, product residual stress is low after the drawing of patterns, the product is out of shape for a short time, hot runner system makes the runner littleer, select for use needle valve formula hot runner to advance the pouring point and just can only see the valve needle mark.

3. The productivity is improved, and the automatic production is realized

After the plastic product is molded by the hot runner mold, a sprue does not need to be built, and a condensed material handle is taken, so that the automatic separation of the sprue and the product is facilitated, the automation of the production process is convenient to realize, and the molding period of the plastic product is shortened.

4. Balance temperature, accurate control

The hot runner system can be balanced manually according to the rheology principle, realizes mold filling balance through temperature control and a controllable nozzle, has good natural balance effect, accurately controls the pouring gate, ensures the consistency of multi-cavity molding, and improves the precision of a plastic part.

Second, the common failure of the temperature controller

1. The temperature controller indicates abnormal, indicates "HH", aviation plug not plugged or thermocouple wire contact is bad, or thermocouple closes and opens. Showing "LLL" thermocouple wires reversed;

2. the temperature controller trips, typically either through a heating element leakage or internal short circuit;

3. the temperature controller temperature shows that the upper limit is reached, but the temperature is still increased, the heater continues to work, and the fault is generally caused by the damage of a silicon controlled rectifier or a solid state relay.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Claims

1. The utility model provides a hot runner walk line mechanism, includes apron (2), runner plate (3) and mould benevolence board (5), its characterized in that: the inboard of apron (2) is equipped with runner plate (3) rather than butt joint, runner plate (3) below install with flow distribution plate (1) that apron (2) are connected, hot nozzle (7) are installed in the inboard butt joint of flow distribution plate (1), the inboard of runner plate (3) is equipped with mould benevolence board (5), mould benevolence board (5) with be equipped with hot nozzle line way (6) between runner plate (3), hot nozzle line way (6) set up in runner plate (3) move towards one side of mould benevolence board (5).

2. The hot runner routing mechanism of claim 1, wherein: the runner plate (3) with be equipped with between mould benevolence board (5) cushion (501), cushion (501) with be equipped with sprue nozzle (401) between runner plate (3), the top assembly mounting of sprue nozzle (401) has central location spare (4).

3. The hot runner routing mechanism of claim 1, wherein: and a runner plate temperature thermocouple, a pressure-bearing ring and an electric heating bent pipe are assembled at the position, close to the flow distribution plate (1), of the runner plate (3).