JP6352036B2 - Material supply device and injection molding machine - Google Patents

Description

  The present invention relates to an injection apparatus, a material supply apparatus, and an injection molding machine.

  In general, an injection molding apparatus that forms various molded articles by injecting an injection material into a mold is well known. A material supply device is connected to a heating cylinder having a nozzle (injection port) at the tip. A material passage is formed inside the material supply device, and a screw is inserted into the material passage. The screw is rotationally driven by a drive mechanism (not shown) including a hydraulic motor and an electric motor connected to the material supply device.

  The material supply device is provided with a material input port for supplying material substantially orthogonal to the material passage, and a material hopper is connected to the material supply port. The raw material for injection supplied from the material supply port is sent to the heating cylinder by the drive mechanism. A heater is wound on the outer peripheral surface of the heating cylinder, and the raw material in the heating cylinder is heated and melted by the heater.

  During the molding operation, the material supply device is constantly heated by heat conduction from the heating cylinder. Therefore, the raw material in the material supply apparatus may be heated and melted. If the raw material is melted in the material supply device, the material passage may be blocked and a material supply failure may occur. Therefore, in order to transport the raw material into the heating cylinder without melting the raw material in the material supply apparatus, a water supply passage for cooling is provided inside the material supply apparatus, and tap water, cooling water, etc. are circulated in the material supply apparatus. It is comprised so that the temperature in this may be lowered | hung (refer patent document 1).

Japanese Patent Application No. 11-357958

  However, the conventional material supply device having the cooling means as described above requires a cooling device that circulates the heat transfer medium and its control means, so that the configuration of the device becomes complicated and the product cost increases. There is a point.

  The present invention has been made in view of the above-described problems, and provides a technique for preventing the raw material from being melted before the material is supplied to the injection mechanism (injection means).

A material supply device according to the present invention is a material supply device connected to an opening of an injection cylinder of an injection molding machine, and a material input port for supplying raw materials for injection, and the material input from the material input port. A main body having a passage for conveying the raw material toward the injection cylinder, a delivery mechanism for conveying the raw material toward the injection cylinder in the passage, and disposed between the main body and the injection cylinder A heat insulating material that insulates the heat of the injection cylinder from being transmitted to the main body, and a passage member that is provided on an inner peripheral surface of a through hole formed in the heat insulating material and allows the raw material to pass from the main body. The heat insulating material is provided on a peripheral edge portion of the opening, and the passage member is provided on an inner peripheral surface of the opening .

The material supply device according to the present invention is a material supply device connected to an opening of an injection cylinder of an injection molding machine, and is supplied from a material input port for supplying raw materials for injection, and from the material input port. A main body having a passage for conveying the raw material toward the injection cylinder; a delivery mechanism for conveying the raw material toward the injection cylinder in the passage; and between the main body and the injection cylinder. And a heat insulating material that insulates the heat of the injection cylinder from being transmitted to the main body, and an inner peripheral surface of a through hole formed in the heat insulating material, and allows the raw material to pass through the main body. A film having a surface hardness equal to or higher than the surface hardness of the raw material , wherein the heat insulating material is provided on a peripheral edge of the opening, and the film is provided on an inner peripheral surface of the opening. .

  An injection molding machine according to the present invention includes an injection cylinder that injects a molten material for injection, and the material supply device.

  According to the present invention, it is possible to prevent the material before being supplied to the injection mechanism (injection means) from melting. Moreover, since equipment such as a cooling mechanism is not required, a great increase in cost is not caused.

It is a partial cross section figure of the injection mechanism of the injection molding machine to which the material supply apparatus concerning one embodiment of the present invention is applied. It is detail drawing which shows the 1st Example of the heat insulation structure of the injection mechanism of this invention. It is detail drawing which shows the 2nd Example of the heat insulation structure of the injection mechanism of this invention. It is a front view of the heat insulation member in a 2nd Example. It is detail drawing which shows the 3rd Example of the heat insulation structure of the injection mechanism of this invention.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 1 is a partial cross-sectional view of an injection mechanism of an injection molding machine (injection molding apparatus) to which a material supply apparatus 1 according to an embodiment of the present invention is applied. Although the present embodiment shows an example in which the present invention is applied to a material supply apparatus for an injection molding machine, the present invention can also be applied to other apparatuses.

  An injection molding machine A includes an injection mechanism (injection apparatus) shown in FIG. 1, a mold (not shown) having a molding portion therein and a cavity for molding injection material melt-injected by the injection mechanism, A mold clamping mechanism (not shown) (including a drive unit) that performs opening / closing and mold clamping operations. Then, a molded product is manufactured by supplying the molten injection material into the mold cavity by an injection mechanism.

  The injection mechanism includes an injection cylinder 10 to which the material supply device 1 is connected and a material supply function is provided. The material supply apparatus 1 supplies the raw material for injection which is not melted into the injection cylinder 10 (inside the injection means). The injection cylinder 10 includes a cylindrical heating cylinder 11 having an injection raw material passage 11a therein. The material passage 11 a is formed concentrically with the heating cylinder 11 and penetrates from the upper end to the lower end of the heating cylinder 11. A heater 13 for heating the heating cylinder 11 is wound around the lower outer peripheral surface of the heating cylinder 11, and the raw material passing through the material passage 11 a is heated and melted by the heat from the heater 13.

  A nozzle (injection part) 12 is provided at the lower end of the heating cylinder 11, and a band heater 14 is also provided around the nozzle 12. An electric actuator 15 is attached to the upper end of the heating cylinder 11. In the case of this embodiment, the actuator 15 moves the plunger 16 inserted into the passage 11a forward and backward. FIG. 1 shows a state in which the plunger 16 is retracted. By moving the plunger 16 downward from the position shown in FIG. 1, the molten resin in the passage 11a is transferred from the nozzle 12 to a molding portion in a mold (not shown). It will be injected.

  In the present embodiment, the plunger 16 is advanced and retracted. However, a screw conveyor type configuration in which a screw provided in the passage 11a is rotated to inject molten resin may be used. In addition, although the actuator 15 is electrically operated, any hydraulic pressure or the like may be used as long as it is a power for moving the plunger back and forth.

  The material supply device 1 includes a passage forming member 30 (main body portion), a material feeding mechanism 3, and a hopper 4. The passage forming member 30 is formed with a passage portion 30 a and a hopper mounting portion 32 having a circular cross section through the passage forming member 30. In the present embodiment, the passage forming member 30 and the hopper mounting portion 32 are integrally formed, but a configuration may be adopted in which both are fixed separately.

  The hopper mounting portion 32 (material input port) is formed with an introduction passage portion 30b that opens to the end surface thereof. The introduction passage portion 30b extends in a direction substantially orthogonal to the passage portion 30a and communicates with the passage portion 30a. In the present embodiment, the introduction passage portion 30b and the passage portion 30a are orthogonal to each other, but the introduction passage portion 30b may be inclined and extended from the orthogonal direction of the passage portion 30a.

  A threaded portion (female threaded portion) that engages with a threaded portion (male threaded portion) formed around the throat of the hopper 4 is formed on the inner peripheral surface of the opening end side of the introduction passage portion 30b. The hopper 4 is detachably attached to the hopper attachment portion 32 by screwing of the screw portion. In this embodiment, a screw structure is used, but other types of attachment / detachment structures may be used.

  As a delivery mechanism for supplying the raw material for injection introduced into the passage portion 30a to the passage 11a in the injection cylinder 10, a screw 34 provided in the passage portion 30a and a motor 40 for rotating the screw 34 are provided. One end of the screw 34 is connected to the output shaft of the motor 40, and the other end is supported by the passage member 36. The motor 40 and the passage member 36 are fixed to both ends of the passage forming member 30 so as to support the rotating shaft of the screw.

  The passage member 36 is formed with a passage portion 36a that forms a passage for the raw material for injection. The height of the passage surface of the passage portion 36a needs to be equal to or less than the height of the passage surface of the passage portion 30a. As a result, when the raw material for injection is transported from the passage forming member 30 to the passage member 36, the raw material for injection can be transported without passing over the passage surface of the passage portion 36a at the connecting portion. Similarly, also when conveying from the channel | path member 36 to the heating cylinder 11, the height of the channel | path part 36a needs to be more than the material supply hole 11b.

  A heat insulating material 35 that prevents heat from the heating cylinder 11 from being conducted to the passage forming member 30 is disposed at a contact portion of the passage forming member 30 with the heating cylinder 11. The heat insulating material 35 is provided with a through hole 35a. In other words, the heating cylinder 11 and the material supply device 1 are connected to each other with a heat insulating material interposed therebetween.

  FIG. 2 is a detailed view showing a first embodiment of the heat insulating structure of the injection mechanism of the present invention.

  The heat insulating material 35 is assembled so as to be in contact with the heating cylinder 11 and at least one of the passage forming member 30 and the passage member 36. Accordingly, the passage forming member 30 and the passage member 36 are not in direct contact with the heating cylinder 11, and the heat of the heating cylinder 11 is not transmitted to the passage forming member 30 and the passage member 36. Therefore, the raw material for injection does not melt in the material passage. That is, it is possible to prevent the material (raw material) before being supplied to the injection cylinder 10 that is an injection mechanism (injection means) from being melted. Moreover, since equipment such as a cooling mechanism is not required, a great cost is not required. The heat insulating material 35 has a structure that does not come into contact with the raw material for injection as will be described later. However, in order to prevent wear due to friction with the material that occurs during material conveyance, at least a hardness equal to or higher than the surface hardness of the material to be conveyed. It is necessary to have. When worn out, the abrasion powder coming out of the heat insulating material 35 is conveyed to the heating cylinder together with the raw material for injection and molded, which may cause molding failure.

  The passage portion 36 a of the passage member 36 is longer than the width of the heat insulating material 35 and is formed to the inside of the material supply hole 11 b formed in the heating cylinder 11. Thereby, the raw material for injection is supplied from the passage forming member 30 to the heating cylinder 11 without contacting the heat insulating material 35.

  FIG. 3 is a detailed view showing a second embodiment of the heat insulating structure of the injection mechanism of the present invention. FIG. 4 is a front view of the heat insulating material 35 used in the second embodiment.

  The passage member 36 is fixed in the through hole 35 a formed in the heat insulating material 35, and the heat insulating material 35 and the passage member 36 are integrated. The integrated heat insulating material 35 is interposed between the passage forming member 30 and the heating cylinder 11 to reduce heat conduction and prevent the heat insulating material 35 from being worn during material conveyance. It is necessary to prevent the passage member 36 integrated with the heat insulating material 35 from coming into contact with the heating cylinder 11. As a method for fixing the heat insulating material 35 and the passage member 36, any method such as press-fitting or adhesion may be used.

  FIG. 5 is a detailed view showing a third embodiment of the heat insulating structure of the injection mechanism of the present invention.

  A coating treatment (coating) is applied to the inner peripheral surface of the through hole 35 a formed in the heat insulating material 35 to form a coating treatment surface 35 b, which is interposed between the passage forming member 30 and the heating cylinder 11. By setting the surface hardness of the coating treated surface 35b to be equal to or higher than the surface hardness of the raw material for injection to be conveyed, wear during material conveyance is prevented. In this embodiment, no passage member is required.

  As described above, according to the above embodiment, the material is supplied to the heating cylinder without melting the material in the material supply apparatus with an inexpensive configuration in which a heat insulating material is provided between the material supply member and the heating cylinder. I can do it.

  In addition, by adopting a structure that does not contact the raw material for injection and the heat insulating material, or a structure that protects the heat insulating material, the heat insulating material is not worn, and the shaving powder of the heat insulating material is mixed with the raw material for injection, Insulation failure does not occur.

  In addition, since heat escape from the heating cylinder to the material supply device can be prevented, the molten state of the raw material for injection in the heating cylinder is stabilized, and the stability and reproducibility of the molded product is improved.

DESCRIPTION OF SYMBOLS 1 Material supply apparatus 3 Material feed mechanism 4 Hopper 10 Injection cylinder 11 Heating cylinder 11a Passage 11b Passage supply hole 12 Nozzle 13 Heater 14 Band heater 15 Actuator 16 Plunger 30 Passage formation member 30a Passage part 30b Introduction passage part 32 Hopper attachment part 34 Screw 35 heat insulating material 35a through hole 35b coating surface 36 passage member 36a passage portion 40 motor

Claims (5)

A material supply device connected to an opening of an injection cylinder of an injection molding machine,
A main body having a material inlet for injecting a raw material for injection, and a passage for conveying the raw material introduced from the material inlet toward the injection cylinder;
A delivery mechanism for conveying the raw material toward the injection cylinder in the passage;
A heat insulating material disposed between the main body portion and the injection cylinder to insulate the heat of the injection cylinder from being transmitted to the main body portion;
A passage member provided on an inner peripheral surface of a through hole formed in the heat insulating material, and allowing the raw material to pass from the main body portion;
With
The said heat insulating material is provided in the peripheral part of the said opening part, and the said channel | path member is provided in the internal peripheral surface of the said opening part, The material supply apparatus characterized by the above-mentioned .   The material supply device according to claim 1, wherein the heat insulating material has a surface hardness equal to or higher than a surface hardness of the raw material. A material supply device connected to an opening of an injection cylinder of an injection molding machine,
A main body having a material inlet for injecting a raw material for injection, and a passage for conveying the raw material introduced from the material inlet toward the injection cylinder;
A delivery mechanism for conveying the raw material toward the injection cylinder in the passage;
A heat insulating material disposed between the main body portion and the injection cylinder to insulate the heat of the injection cylinder from being transmitted to the main body portion;
A film having a surface hardness equal to or higher than the surface hardness of the raw material, which is provided on an inner peripheral surface of a through-hole formed in the heat insulating material and allows the raw material to pass from the main body portion;
With
The said heat insulating material is provided in the peripheral part of the said opening part, and the said film is provided in the internal peripheral surface of the said opening part, The material supply apparatus characterized by the above-mentioned . An injection cylinder for injecting molten material for injection;
The material supply device according to any one of claims 1 to 3,
An injection molding machine comprising:   The injection molding machine according to claim 4, further comprising a mold connected to the injection cylinder, wherein a material is injected from the injection cylinder into a cavity of the mold to form a molded product.

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