JP3049681U - Injection molding machine - Google Patents

Abstract

(57) [Problem] [PROBLEMS] Not only a lot of time is required for purging with a conventional method for color change and resin change of a molten resin in an injection apparatus, but also several hundred shots are required for complete replacement. Sometimes it took. SOLUTION: A mount having two injection devices arranged side by side is slidable in a direction perpendicular to an injection shaft so that each injection device can take an injection molding position and a purge position.
A purge stage facing the injection device is provided at the purge position of each injection device, so that the injection devices are alternately provided for molding, while the other injection devices perform purging,
Instead, it was replaced with the next molding resin.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to an injection molding machine capable of completely performing a color change of a molten resin and a purging accompanying a resin change in an injection device of the injection molding machine.

[0002]

[Prior art]

 To change the color of the molten resin and change the resin in the conventional injection device, the screw is rotated to transport the resin raw material and the molten resin remaining in the heating cylinder to the front of the heating cylinder, and then move the screw back and forth as needed to discharge from the nozzle. It was running by moving forward.

[0003]

[Problems to be solved by the invention]

 However, purging in the conventional method requires a considerable amount of time, and it is difficult to perform the purging completely. The reason is that the resin adhering to the screw's lead side wall and the resin adhering to the concave portion of the resin passage from the tip of the heating cylinder to the nozzle are not easily removed due to the weak pressure of resin transport, and the next resin molding The number of moldings to be replaced with the next resin may range from tens of shots to hundreds of shots, due to the occasional peeling of the resin. Under such circumstances, the required time and the results obtained by the conventional purging method were extremely unstable, making it difficult to make a production plan for molding and reducing production efficiency.

[0004] In addition, since the use conditions of the injection device are severe, there are many screw-related accidents, and once an accident occurs, the machine is forced to stop for a long time, leading to a decrease in the operation rate of the injection molding machine. is there.

[0005]

[Means for Solving the Problems]

 Therefore, a pedestal having two injection devices arranged side by side is slidable in a direction perpendicular to the injection shaft so that each injection device can take an injection molding position and a purge position, and each of the injection devices can have a purge position. A purge stage facing the injection device is provided at the purge position of the injection device so that the injection device is alternately used for molding. During this time, the other injection devices are purged and replaced with the next molding resin. It was done.

[0006]

[Embodiment of the invention]

 Reference numerals 1a and 1b denote injection devices having the same specifications, and are arranged side by side on the gantry 2. The gantry 2 is slidable on rails 4, 4 installed on the upper surface of the base 3 of the injection molding machine at right angles to the injection axis which is the central axis of the heating cylinder of the injection devices 1a and 1b. Reference numeral 5 denotes a transfer cylinder for sliding the gantry 2, the main body side of which is fixed to the base 3, and the rod thereof is fixed to the gantry 2. The length of the rail 4 is at least twice as long as the interval between the two injection shafts, and the rail 4 is distributed around the mold clamping shaft, which is the central axis of the mold clamping device 8.

FIG. 1 shows a state in which the gantry 2 is positioned so that the injection axis of the injection apparatus 1b coincides with the mold clamping axis, and is an injection molding position of the injection apparatus 1b. In the injection molding position, the injection device 1b is moved along the injection shaft by a moving device provided between the injection device 1b and the gantry 2, and the nozzle 9b of the injection device 1b can be pressed against the fixed mold 10. No.

[0008] As described above, Fig. 1 shows a situation in which a molding operation is performed by the injection device 1b. At this time, the injection device 1a is at a purge position opposed to the purge stage 6a while being separated from the mold clamping shaft. The purge stage 6a is a U-shaped partitioning member for guiding the purge resin discharged from the nozzle 9a of the injection device 1a to the lower conveyor 7 while preventing the purge resin from scattering around, It is fixed to the upper surface of the base 3.

The screw rotation and the forward / backward drive of the injection device 1a can be set individually for the injection device 1b, and operating conditions suitable for purging different from the molding operation can be set. Since the purging operation of the injection device 1a is performed during the molding operation of the injection device 1b, there is sufficient time allowance, including not only the rotation of the screw and the longitudinal movement drive but also the change of the temperature of the heating cylinder. Thus, an ideal purge can be realized. Since the resin used for purging is the resin to be molded next, the next molding operation is started immediately by transferring the injection device 1a to the mold clamping shaft when the molding production in the injection device 1b is completed. I can do it.

When the injection device 1a is in the injection molding position and is being used for the molding operation, the injection device 1b is at the purge position opposite to the other purge stage 6b, contrary to the above. The purge stage 6b has the same shape as the purge stage 6a, and has a U-shape in plan view that guides the purge resin discharged from the nozzle 9b of the injection device 1b to the lower conveyor 7 while preventing the resin from scattering around. A screen-shaped member which is fixed to the upper surface of the base 3. The conveyor 7 is installed on the base 3 below the purge stages 6a and 6b in the moving direction of the gantry 2, and transports the purge resin discharged from the purge stage to the rear of the injection device.

[0011]

[Effect of the invention]

 Since the present invention is constructed as described above, the molding production plan is not hindered by the problems related to the purging and injection equipment, especially screws, associated with the color change and resin change of the molding resin. Production efficiency is obtained.

[Brief description of the drawings]

FIG. 1 is a plan view of the injection molding machine of the present invention.

FIG. 2 is a side view of the injection molding machine of the present invention.

[Description of Signs] 1a, 1b {injection device 2} gantry 3} base 4} rail 5> transport cylinder 6a, 6b}パ ー ジ Purge stage 7 ‥‥‥‥‥‥ Conveyor 8 ‥‥‥‥‥‥ Mold clamping device 9a, 9b ノ ズ ル Nozzle 10 ‥‥‥‥‥ Fixed mold

Claims (1)

[Utility model registration claims] An injection molding machine in which a pedestal having two injection devices arranged side by side is slidable in a direction perpendicular to an injection shaft. An injection molding machine characterized in that a purge stage facing the injection device is provided at a purge position of each injection device.