JPH0476766B2 - - Google Patents

Description

Detailed Description of the Invention "Industrial Application Field" The present invention is characterized in that the molding material is plasticized and kneaded in the process of being sent forward along the groove of the screw by the rotational transfer action of the screw of an injection molding machine. When a predetermined amount of molten resin is loaded into the pot on the side of the horizontal injection plunger, the plunger is inserted into the pot and is press-fitted into the mold cavity as the plunger moves forward. After the plunger is removed from the pot, the inside of the pot can be easily cleaned by rotating the plunger together with the plate around the pivot pin, and at the same time, the color and material can be easily changed. This invention relates to an injection molding machine with a plunger moving device.

``Prior art'' Because the conventional plunger is fixed to the tip (lower end) of the injection ram, there are problems such as the inside of the pot cannot be cleaned unless the plunger is removed; The problem is that it is not easy to change materials or colors.

``Problems to be Solved by the Invention'' The present invention was made in view of these problems, and allows for changing materials and coloring when cleaning the inside of the pot without removing the plunger attached to the tip of the injection ram. The technical problem is that the plunger can be quickly and easily rotated together with the plate via a pivot pin so that replacement can be performed smoothly.

"Means for Solving the Problems" The present invention takes the following technical means to solve the above technical problems.

An injection molding machine with a plunger moving device having the following conditions A, B, C, D and E.

A: With the plunger transition chamber in the center, the injection cylinder is placed on one side of the transition chamber, and the pot is placed on the other side.

B. An injection ram movable within the injection cylinder is arranged, the back side of a movable platen is fixed to the tip of the injection ram, a frame is fixed to the surface of the movable platen, and the lower end of the movable platen is attached to a pot. Guided and supported by tie bars fixed to the panel.

C. The plate and plunger are rotatably held in the frame via a pivot pin.

D. The plate held to the frame via the pivot pin is held in place by a removable fixing pin.

E. A cylindrical body is attached to the front end of the plunger for drawing out the remaining material in the plunger.

"Operation" The back of the movable platen is fixed to the tip of the injection ram,
Further, since a frame is fixed to the surface of the movable platen and the movable platen is guided and supported by four tie bars, the plunger fixed to the frame via the fixing pin can be fully removed from the pot. By removing the fixing pin, the plunger can rotate together with the plate via the pivot pin.

"Example" Preferred examples of the present invention will be described below based on the drawings.

FIG. 1 is a sectional view of a pre-plastic injection molding machine equipped with a plunger moving device according to the present invention, and FIG. 2 is a perspective view of the main part of FIG. 1.

Reference numeral 10 indicates the entire injection molding machine, which has a plunger transition chamber 101 formed approximately in the center, an injection cylinder 102 in one side of the transition chamber 101, and a pot 103 in the other side.

Injection cylinder 102 and the plunger transition chamber 1
An injection ram 1021 that is movable within the 01, that is, movable up and down, is disposed, a piston 1022 is formed on one side of the injection ram 1021, and the piston 102
2 is arranged inside the injection cylinder 102.

The plunger transition chamber 101 is connected to the injection ram 1.
021, there is sufficient space 1011 for the plunger 204 to move forward or backward.

An annular flange (not shown) is formed on the end surface of the plunger 204, and after the plunger 204 is inserted into the plate 2041, the flange is fixed with screws.

The pot 103 has a threaded portion 1 at the upper end of the pot 103.
032 is attached to the pot attachment board 107 attached to the lower end of the plunger transition chamber 101 via a nut 1071.

A nozzle guide 234 is installed at the tip of the pot 103.
is installed.

One end of the plunger 204 is attached to a substantially rectangular plate 2041.
Vertical holes 2042, 2042 are formed on the left and right sides of 041, and a cylindrical body 2044 for drawing out the remaining material 2043 in the pot is attached to the other end.

Frame 205 holding the plate 2041
A recess 2051 is formed between the upper and lower flanges 2052, and the plate 2041 is inserted into the recess 2051.
Insert.

Since insertion holes are formed in the upper and lower flanges 2052, the insertion holes and the plate 2
The frame 20 is fixed by a removable fixing pin 206 that aligns with the vertical hole 2042 of 041.
5 is held in place at the same time as the pivot pin 20
7, the plate 2041 is rotatably held.

The frame 205 is attached to the end face of the injection ram 1021, and has a movable platen 2 that can move forward and backward.
08 by an appropriate means such as well-known welding.

In the drawing, reference numeral 201 is a heating cylinder, 202 is a screw, 30 is a tie rod, and 209 is a tie bar whose one end is fixed to the pot mounting plate 107 and which guides and supports the movable plate 208.

"Effects of the Invention" In the injection molding machine of the present invention, the molding material is plasticized by the rotation of the screw and transferred to the tip of the plunger in the pot.

The plunger is pushed back little by little by the pressure of the material sent to its tip, and when it reaches a set value, it is activated by the operation of a limit switch.

The molten material then presses the plunger downward, thereby forcing the material into the mold cavity.

However, after a certain period of use, when cleaning the corner inside the pot, the plunger is removed from the pot, and then the plunger rotates together with the plate 2041 using the pivot pin 207 as a fulcrum to the position indicated by the dotted line, thereby removing the obstruction. It has the characteristics that the inner wall of the pot can be easily cleaned.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of an injection molding machine equipped with a plunger moving device according to the present invention, and FIG. 2 is a perspective view of the main part of FIG. 1. Explanation of symbols, 101... Plunger transition chamber, 10
21... Injection ram, 103... Pot, 205... Frame, 208... Movable plate, 209... Tie bar.

Claims (1)

[Scope of Claims] 1. An injection molding machine with a plunger moving device, which satisfies the following conditions A, B, C, D, and E. A: A plunger transition chamber 101 is placed in the center, and an injection cylinder 102 is arranged on one side of the transition chamber 101.
A bot 103 is placed on the other side. B. An injection ram 1021 movable within the injection cylinder 102 is disposed, and the injection ram 102
The back surface of a movable platen 208 is fixed to the tip of the movable platen 208, a frame 205 is fixed to the surface of the movable platen 208, and the lower end of the movable platen 208 is guided and supported by a tie bar 209 fixed to the pot mounting plate 107. thing. C. The plate 2041 and the plunger 204 are rotatably held by the frame 205 via the pivot pin 207. D The frame 2 via the pivot pin 207
05 is held in place by a removable fixing pin 206. E A cylinder 20 is provided at the front end of the plunger 204 to draw out the remaining material inside the plunger 204.
44 must be installed.