Apparatus (3) for detecting a leak of molten plastics material in a hot runner mould (1) comprises a detecting circuit (28) which in turn comprises a plurality of tubular detecting elements (30) connected in series by connecting conduits (32). The detecting circuit (28) is located in galleries (25) in the hot runner mould (1) with the tubular detecting elements (30) located adjacent locations in the galleries (25) where leaks are likely to occur. A compressed air source (40) delivers compressed air at a regulated pressure through the detecting circuit (28) at a controlled flow rate controlled by a flow controller (45). A first pressure sensor (43) at the upstream end of the detecting circuit (28) and a second pressure sensor (44) at a downstream end of the detecting circuit (28) monitors the pressure upstream of the detecting circuit (28). The tubular detecting elements (30) are of heat stabilised silicone rubber material of deformable transverse cross-section, which is deformable by molten plastics material leaking into the gallery (25) adjacent the corresponding one of the tubular detecting elements (30). A microcontroller (47) monitors signals from the first and second pressure sensors (43) and (44) and on detecting an increase in the pressure read from the second pressure sensor (44) above a stored normal pressure value, the microcontroller (47) operates a sounder (52) and a relay (54) to activate a visual alert and to deactivate the moulding machine.

A mould closing unit (100) for an injection-moulding machine has an electromechanical closing mechanism (M) for opening and closing an injection mould, said electromechanical closing mechanism (M) being actuated by means of at least one spindle unit (10) having at least one spindle (12) and at least one spindle nut (14). Cooling by way of cooling ducts (32) for heat dissipation from the spindle unit (10) is provided. Since the spindle (12) has, in the core, at least one bore (24) in which a cooling and/or lubricating medium is passed into the region of the contact points between the spindle nut (14) and the spindle (12) via at least one lance (20), efficient cooling of the spindle unit is achieved.

A mould closing unit (100) for an injection-moulding machine has an electromechanical closing mechanism (M) for opening and closing an injection mould, said electromechanical closing mechanism (M) being actuated by means of at least one spindle unit (10) having at least one spindle (12) and at least one spindle nut (14). Cooling by way of cooling ducts (32) for heat dissipation from the spindle unit (10) is provided. Since the spindle (12) has, in the core, at least one bore (24) in which a cooling and/or lubricating medium is passed into the region of the contact points between the spindle nut (14) and the spindle (12) via at least one lance (20), efficient cooling of the spindle unit is achieved.

Provided is a magnetic clamp device that is capable of more finely measuring an induced voltage generated in a coil and selecting countermeasures against reductions in magnetization force. Multiple magnet blocks 11, 21 each comprising an invertible magnet 18, the polarity of which can be inverted, and non-invertible magnet 15, are positioned on a surface of a plate PL composed of magnetic body magnetically clamping a mold M1, M2 when in a magnetized state. The magnetic flux traversing the invertible magnet 18; and a control device 33 that determines whether or not there has been a polarity inversion in the induced voltage detected from the coil 31, and if there has been a polarity inversion, warns that the adhesion of the molds M1, M2 has decreased.

When an injection molding machine performs molding, the mold clamping force on the mold is adjusted on the basis of a mold displacement of the mold or the injection peak pressure and injection foremost position so that the molding is performed without causing flash and by an appropriate mold clamping force with which energy can be reduced. The amount of mold displacement and also the injection peak pressure and the injection foremost position are monitored during automatic operation. If there occurs no mold displacement change exceeding a threshold or if there occurs no injection peak pressure anomaly or injection foremost position anomaly exceeding thresholds, the automatic operation is continued. If the mold displacement change occurs or if the injection peak pressure anomaly and the injection foremost position anomaly occur, the operation of the injection molding machine is stopped.

An injection molding system includes: an injection molding machine where a shaping mold is installed; a material supply device supplying a material to the injection molding machine; a temperature controller controlling a temperature of the shaping mold; a dryer drying a material stored in the material supply device; a controller controlling the injection molding machine; and a casing. The injection molding machine, the material supply device, the temperature controller, the dryer, and the controller are provided inside the casing. The casing has a caster and is configured to be movable.

An injection molding machine includes a belt transmission mechanism (mold opening/closing mechanism, ejector mechanism, screw drive mechanism, injection mechanism) configured to transmit drive force from a driving shaft (driving pulley) to a driven shaft (driven pulley) by means of a belt. The injection molding machine includes: a cover covering part or entirety of the belt; and a sensor attached to the cover and configured to detect an abnormality of the belt.

An injection molding machine includes a safety door and a guide for slidably guiding the safety door in a direction of opening and closing a mold of the injection molding machine. The guide includes: a first guide part fixed to a machine base of the injection molding machine; a second guide part arranged on the safety door's closing direction side of the first guide part and configured to be removable from the machine base; and a coupling configured to connect the first guide part and the second guide part so that the second guide part can be moved onto the first guide part.

An injection molding machine includes a safety door and a guide for slidably guiding the safety door in a direction of opening and closing a mold of the injection molding machine. The guide includes: a first guide part fixed to a machine base of the injection molding machine; a second guide part arranged on the safety door's closing direction side of the first guide part and configured to be removable from the machine base; and a coupling configured to connect the first guide part and the second guide part so that the second guide part can be moved onto the first guide part.

An ejector for a molding machine includes an ejector plate and an ejector rod. The ejector plate has an opening and a distance block attached to the ejector plate. The ejector rod includes a first and a second end portion. The first end portion is in the opening of the ejector plate. The ejector rod has a first initial position relative to the ejector plate. The first end portion of the ejector rod is pushed in the direction of the ejector plate by a first force applied to the second end portion of the ejector rod. The ejector also includes a spring around the first end portion of the ejector rod and coupled to the ejector plate. The spring is configured to provide a second force to the ejector plate upon application of the first force to the second end portion of the ejector rod. There is always a gap between the first end portion of the ejector rod and the ejector plate.