JP3033382U - Raw material supply device for injection molding machine - Google Patents

Abstract

(57) [Summary] [Problem] In the conventional method for supplying a raw material resin, not only is the gas released due to plasticization not sufficiently released, but the physical properties and surface condition of the molded product are deteriorated, and the raw material resin is supplied through the supply passage. There were times when I was blocked. SOLUTION: A supply cylinder having an elliptical cross section that communicates with a supply hole at the rear of the heating cylinder is divided into front and rear, and a rear side is a raw material resin passage,
The front is a gas discharge passage. The partition plate that divides the supply cylinder into front and rear is movable up and down, and is provided with a fixing screw that fixes the partition plate at an arbitrary supply opening.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to improvement of an apparatus for supplying a raw material resin of an injection molding machine into a heating cylinder.

[0002]

[Prior art]

 In the conventional method of supplying the raw material resin into the heating cylinder in the in-line screw type injection molding machine, a hopper is attached to the opening at the rear of the heating cylinder and the raw material resin is dropped and supplied directly. However, in such a supply method, since the supply amount of the raw material resin cannot be controlled, a feed screw is interposed between the hopper and the opening of the heating cylinder, and the rotation speed of the feed screw is controlled to control the raw material resin. The supply amount of was controlled. Also, Japanese Patent Publication No. 4-57489 discloses that the supply amount of the raw material resin can be adjusted by changing the ceiling position of the communication hole to the heating cylinder by the partition wall provided in parallel with the screw shaft. . On the other hand, in the technology disclosed in Utility Model Registration No. 3019766, a first raw material supply hole is provided vertically above the opening of the heating cylinder, and a second raw material supply hole communicating with the first raw material supply hole by a sloped passage. Was provided with the hopper.

[0003]

[Problems to be solved by the invention]

 In the method using the feed screw and the method using the partition wall (Japanese Patent Publication No. 4-57489), the supply amount of the raw material resin can be controlled, but vaporization due to plasticization and release of gas composed of volatile monomers are prevented. Since it could not be performed sufficiently, it deteriorated the physical properties and surface condition of the molded product. In particular, the effect of gas was remarkable in the system in which a hopper was attached to the opening at the rear of the heating cylinder and the raw material resin was dropped and supplied directly. On the other hand, in the method of Utility Model Registration No. 3019766, the gas is easily released, but since the opening of the slope passage is fixed, the opening of the slope passage described above is used when using large raw material resin pellets or pulverized material. When the raw material resin is clogged, or conversely, in order to avoid the above situation, when the opening of the slope passage is widened, the raw material resin flowing into the heating cylinder is increased and the release of the gas is hindered.

[0004]

[Means for Solving the Problems]

 Therefore, a supply hole formed in the heating cylinder, a supply cylinder that communicates with the supply hole substantially vertically in the front and a communication with a supply slope in the rear, and the supply cylinder is divided into front and rear, and the supply slope extends from the supply slope to the supply hole. This is to propose a raw material supply device for an injection molding machine, which is composed of a vertically slidable partition plate that constitutes a supply opening for supplying the raw material.

[0005]

[Embodiment of the invention]

 Next, an embodiment of the present invention will be described in detail with reference to the drawings. 1 is a sectional side view of the raw material supply apparatus of the present invention, and FIG. 2 is a sectional view taken along the line AA in FIG.

Reference numeral 1 denotes a screw, which is inserted into the heating cylinder 2 so as to be rotatable and reciprocally movable. The heating cylinder is provided with a supply hole 13 for supplying the raw material resin 16 on the upper surface of the rear portion, and the supply hole 13 is provided on the supply cylinder 11 of the housing 3 and the supply slope 12 which is a part of the supply cylinder 11. A nut 4 is fixed to the housing 3 forming a part of the injection device 15 so as to communicate with each other. The cross-sectional shape of the supply cylinder 11 is a substantially oval shape that is long in the axial direction of the heating cylinder 2. The front side of the heating cylinder 2 communicates with the supply hole 13 almost vertically, and the rear side of the heating cylinder 2 is flat. Alternatively, it is communicated with the supply hole 13 by a supply slope 12 having a concave slope at a right angle to the raw material resin falling direction.

A seat 5 for mounting the hopper 6 and the partition plate 7 is fastened to the upper surface of the housing 3 with bolts 10. The hopper 6 is a container for storing the raw material resin 16, and in the present embodiment, the front side of the heating cylinder is a vertical plane, the other surface is an inverted cone or an inverted pyramid shape, and the bottom is the supply cylinder 11. It communicates with the rear part. The partition plate 7 is a plate material having an L-shaped side surface, and is vertically moved by a holder 8 fixed to the front vertical surface of the hopper 6 and a fixing screw 9 which is screwed to the holder 8 and whose tip presses the side surface of the partition plate 7. Can be mounted freely. The partition plate 7 has a width slightly smaller than the inner dimension of the supply cylinder 11 and divides the supply cylinder 11 into front and rear parts, and the rear part thereof serves as a passage for the raw material resin 16 communicating with the hopper 6, and the front part thereof is the supply hole 13 The raw material resin 16 supplied from the inside to the heating cylinder 2 serves as a passage for releasing the gas when it is plasticized by the screw 1 to the atmosphere. The L-shaped bent portion of the partition plate 7 has a function of a protective lid above the gas passage. An end surface of the partition plate 7 adjacent to the supply slope 12 has an appropriate shape according to the supply slope to form a supply opening 14. Further, a scale indicating the opening of the supply opening 14 is engraved on the side surface of the partition plate 7.

The supply slope 12 may be formed only in the housing 3, but preferably, as shown in the drawing, it is also provided in the heating cylinder 2 part in order to provide the supply opening 14 as close to the screw 1 as possible. A supply slope 12 is provided to smoothly connect the two.

The adjustment standard of the supply opening 14 is that the amount of the raw material resin existing at the upper part of the screw of the supply hole 13 is as small as possible within a range in which the stable raw material resin is supplied from the supply opening 14. preferable. When the pellet shape of the raw material resin is large or when a pulverized material is used, the supply opening 14 should be wide so as not to be blocked. In this case, the amount of the raw material resin in the supply hole 13 increases, but the gap between the resins is large, so that it does not hinder the gas release. On the other hand, when the pellet shape of the raw material resin is small or spherical, the supply opening 14 can be made sufficiently small.

[0010]

[Effect of the invention]

 Since it is configured as described above, there is very little raw material resin 16 above the screw 1 in the supply hole 13 for feeding the raw material resin 16 to the heating cylinder 2, and the gas generated by plasticization can be easily released. Is. Further, since the partition plate 7 can slide up and down, the opening of the supply opening 14 can be freely set, and the supply amount of the raw material can be optimally maintained without obstructing the gas discharge according to the type and shape of the raw material resin. Be drunk

[Brief description of the drawings]

FIG. 1 is a vertical cross-sectional view showing a raw material supply device of the present invention.

FIG. 2 is a sectional view taken along line AA in FIG.

[Explanation of symbols]

 1 Screw 2 Heating Cylinder 3 Housing 4 Nut 5 Seat 6 Hopper 7 Partition Plate 8 Holder 9 Fixing Screw 10 Bolt 11 Supply Cylinder 12 Supply Slope 13 Supply Hole 14 Supply Opening 15 Injection Device 16 Raw Resin

Claims (1)

[Utility model registration claims] 1. An apparatus for supplying a raw material resin to a heating cylinder in which a screw is rotatably and reciprocally inserted, wherein a supply hole formed in the heating cylinder is communicated with the supply hole substantially vertically at the front and at the rear. Raw material supply for an injection molding machine including a supply cylinder that communicates with a supply slope and a vertically slidable partition plate that forms a supply opening that divides the supply cylinder into front and rear and supplies the raw material from the supply slope to the supply hole apparatus.