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US 10,449,604 B2Granted
Injection apparatus and molding machine
AssigneeToshiba Kikai Kabushiki Kaisha
InventorHiroshi Yokoyama
Life of this patent
Estimating the term…
Abstract
In an injection cylinder which can be connected with a plunger, the internal portion of the cylinder part is partitioned by a piston into a rod-side chamber on the side of the piston rod and a head-side chamber on the opposite side. An accumulator can supply a hydraulic fluid to the head-side chamber. A head-use pressure sensor can detect a pressure of the head-side chamber. A flow control valve can control a flow rate of the hydraulic fluid discharged from the rod-side chamber. A control device includes an OP control part which starts open control driving the flow control valve to the opening direction after the start of supply of the hydraulic fluid from the accumulator to the head-side chamber conditional on the detection pressure of the head-use pressure sensor rising up to the predetermined set value.
Claims9
An injection apparatus comprising
- an injection cylinder which includes:
- a piston rod connectable to a plunger capable of sliding in a sleeve communicated with an interior of a die,
- a piston fixed to the piston rod, and
- a cylinder part slidably accommodating the piston,
- in which an internal portion of the cylinder part is partitioned by the piston into a rod-side chamber on a piston rod side and a head-side chamber on an opposite side;
- an input device configured to accept an operation by a user;
- a liquid pressure source which is configured to supply a hydraulic fluid to the head-side chamber;
- a head-use pressure sensor which is configured to detect a pressure of the head-side chamber;
- a flow control valve which is configured to control a flow rate of the hydraulic fluid discharged from the rod-side chamber, wherein the flow control valve is configured to position a valve element at a position in accordance with a command value of an input control command, keeps a port closed while the valve element moves at a time when the valve element is located at a predetermined overlapping section at which a part of the valve element overlaps the port, and makes the port begin opening by the valve element passing through the overlapping section;
- and
- a control device which includes:
- an open control part configured to start open control driving the flow control valve to an opening direction after a start of supply of the hydraulic fluid from the liquid pressure source to the head-side chamber conditional on a detection pressure of the head-use pressure sensor rising up to a predetermined set value,
- a storage part configured to hold characteristic information linking a command value of the input control command to the flow control valve and a speed of the plunger including movement of the plunger caused by clearance flow while the valve element is located in the overlapping section,
- a target speed setting part configured to set a target speed of the plunger based on an operation accepted by the input device, and
- a command value setting part configured to set a command value of a control command output by the open control part in the open control by specifying the command value of the input control command to the flow control valve corresponding to the target speed set by the target speed setting part based on the characteristic information.
12 more elements
An injection apparatus comprising
- an injection cylinder which includes:
- a piston rod connectable to a plunger capable of sliding in a sleeve communicated with an interior of a die,
- a piston fixed to the piston rod, and
- a cylinder part slidably accommodating the piston,
- in which an internal portion of the cylinder part is partitioned by a piston to a rod-side chamber on a piston rod side and a head-side chamber on an opposite side;
- an input device configured to accept an operation by a user;
- a liquid pressure source which is configured to supply a hydraulic fluid to the head-side chamber;
- a rod-use pressure sensor which is configured to detect a pressure of the rod-side chamber;
- a flow control valve which is configured to control a flow rate of the hydraulic fluid discharged from the rod-side chamber, wherein the flow control valve is configured to position a valve element at a position in accordance with a command value of an input control command, keep a port closed while the valve element moves at a time when the valve element is located at a predetermined overlapping section at which a part of the valve element overlaps the port, and make the port begin opening by the valve element passing through the overlapping section;
- and
- a control device which includes:
- an open control part configured to start open control driving the flow control valve to an opening direction after a start of supply of the hydraulic fluid from the liquid pressure source to the head-side chamber conditional on a detection pressure of the rod-use pressure sensor rising up to a predetermined set value,
- a storage part configured to hold characteristic information linking a command value of the input control command to the flow control valve and a speed of the plunger including movement of the plunger caused by clearance flow while the valve element is located in the overlapping section,
- a target speed setting part configured to set a target speed of the plunger based on an operation accepted by the input device, and
- a command value setting part configured to set a command value of a control command output by the open control part in the open control by specifying the command value of the input control command to the flow control valve corresponding to the target speed set by the target speed setting part based on the characteristic information.
12 more elements
Dependencies are inferred from the claim text.