Abstract:
An injection piston drives a screw. An injection hydraulic cylinder drives the injection piston and is partitioned into first and second chambers. A first oil discharge port is disposed in the injection hydraulic cylinder to be blocked by a piston part when the piston part of the injection piston advances to a pressure-holding switching position, and discharges hydraulic oil from the second chamber. A second oil discharge port is disposed in the injection hydraulic cylinder to be capable of discharging hydraulic oil from the second chamber regardless of the position of the injection piston. The injection piston has first and second members. The joint of the first and second members is disposed at a position separated from an end of the piston part on a side of the second chamber by a predetermined distance.
Abstract:
In an injection apparatus, a first cylinder and second cylinder for driving an injection cylinder connected to an injection plunger are connected in parallel with each other with respect to the injection cylinder. A piston of the first cylinder and a piston of the second cylinder are synchronously driven by driving means. A directional control valve and first flow rate adjustment circuit are provided between one end of the injection cylinder and one end of the first cylinder. Moreover, second flow rate adjustment circuit is provided between the other end of the injection cylinder and the other ends of the first and second cylinders.
Abstract:
Agitating pins employed in a kneading apparatus extend in the horizontal direction and rotate around a rotation axis of an agitator extending in the horizontal direction, so that the kneading apparatus can repeat a process in which a material is kneaded and beaten against an inner wall surface of a kneading vessel and the material adhering to the inner wall surface of the kneading vessel, especially on the upper side from the rotation axis of the agitator, falls under its own weight through the clearance between the agitating pins. As a result, the material hardly adheres to the inner wall surface of the kneading vessel, so that the kneading efficiency can be enhanced.
Abstract:
An injection apparatus includes an actuating cylinder, an accommodating chamber, and a volume changing part capable of changing the volume of the accommodating chamber. The actuating cylinder has an operation chamber and a piston accommodated in the operation chamber, and supplies an incompressible fluid to the injection cylinder by forcing out the incompressible fluid inside the operation chamber with the piston. The accommodating chamber is connected to the operation chamber, and holds at least some of the incompressible fluid that flows out from the operation chamber due to the piston being pushed out. The volume changing part expands the volume of the accommodating chamber, at the latest simultaneously with the start of acceleration of the actuating cylinder, and stops the expansion of the volume when the operating speed of the piston of the actuating cylinder has reached a desired speed.
Abstract:
Plasticizing system for plasticizing solidified-resin particle, plasticizing system, comprising: housing assembly providing: (i) melt channel configured to receive solidified-resin particle, and (ii) opposite-facing surfaces spaced apart from each other, and defining, at least in part, convergene channel configured to receive the solidified-resin particle. Opposite-facing surfaces and the convergence channel form part of melt channel. Plunger assembly is movable, at least in part, relative to opposite-facing surfaces. Plunger assembly configured to move, at least in part, solidified-resin particle relative to opposite-facing surfaces along, at least in part, convergence channel. In response to relative movement between solidified-resin particle and opposite-facing surfaces, solidified-resin particle receives, in use, plasticization-inducing effect from opposite-facing surfaces. The plasticization-inducing effect is configured to platicize solidified-resin particle into flowable melt and injected into a mold assembly (850 ).
Abstract:
An injection apparatus includes a pressure accumulating portion, which is connected to an injection cylinder, and a speed reduction mechanism, which reduces the speed of the injection cylinder arranged in the injection apparatus. The speed reduction mechanism includes an actuating member, which moves integrally with a rod of an injection cylinder rod, and a restriction member, which is arranged in a flow passage for draining or supplying hydraulic oil from or to the injection cylinder, and variably narrows the flow passage in conjunction with movement of the actuating member.
Abstract:
An injection apparatus includes an actuating cylinder, an accommodating chamber, and a volume changing part capable of changing the volume of the accommodating chamber. The actuating cylinder has an operation chamber and a piston accommodated in the operation chamber, and supplies an incompressible fluid to the injection cylinder by forcing out the incompressible fluid inside the operation chamber with the piston. The accommodating chamber is connected to the operation chamber, and holds at least some of the incompressible fluid that flows out from the operation chamber due to the piston being pushed out. The volume changing part expands the volume of the accommodating chamber, at the latest simultaneously with the start of acceleration of the actuating cylinder, and stops the expansion of the volume when the operating speed of the piston of the actuating cylinder has reached a desired speed.
Abstract:
Active decompression to prevent melt drool from a mold (12, 14) or runner system (20) is achieved through the selective coupling and de-coupling of an injection piston (34) to a plunger (38). Following successive injection (FIG. 5a) and hold phases (FIG. 5b) of an injection molding process (FIG. 5), the runner and channel system is partially de-compressed (FIG. 5c) by drawing back together, over a short distance, the plunger (38) and the injection pressure (34) as one unit. The injection piston is then mechanically de-coupled from the plunger (FIG. 5e), with the injection piston (34) withdrawn to essentially its final shot position, but minus a customary packing distance (δ). Plastic melt (100), extruded into a shooting pot (28) positioned in front of the plunger (38), is permitted to push the plunger backwards, but now with minimal work expenditure. When the plunger again contacts (FIG. 5f) the injection piston (34), melt pressure now causes both units to be moved back to reach a final shot size volume. Finally, the injection piston (34) drives the plunger (38) forward to eject melt accumulated within the shooting pot (28).
Abstract:
The invention provides a motor-driven injection molding apparatus in which an entire of the apparatus is simplified and made compact. In a motor-driven injection molding apparatus (1), a movable metal mold (12) clamped to a stationary metal mold (11) is mounted to a movable mold plate (13), and two ball screws (17, 18) for moving the movable mold plate (13) are passed through two points on opposing corners of the movable mold plate (13). End portions of the ball screws (17, 18) are set in a cantilever state, and are rotated via pulleys (55, 55) and a timing belt (56), thereby moving the movable mold plate (13). Further, the movable mold plate (13) is guided by a slide guide having a structure that a bearing unit (14) fixed to both sides of a lower portion thereof is fitted to linear rails (15, 16). On the other hand, in an injection side, a injection side movable plate (33) to which an injection plunger (42) is fixed by two tie bars (35, 36) and two ball screws (37, 38) on respective opposing corners, and the same slide guides as mentioned above moves. The movable mold plate (13) is moved by the opening and closing side ball screws (17, 18) so as to be mold clamped, and the injection side movable plate (33) is thereafter moved so as to inject.
Abstract:
An injection apparatus includes a plunger, an injection sleeve, a sleeve frame, and a rotational-linear motion transmission mechanism. The plunger is supported at a substantially central portion of a supporting frame. The injection sleeve is provided to be movable forward/backward with respect to the supporting frame and receives a distal end portion of the plunger such that the distal end portion can move forward/backward. The sleeve frame supports the injection sleeve. The rotational-linear motion transmission mechanism is arranged between a motor and the supporting frame and converts a rotational motion into a linear motion.