A production plant includes an injection unit suitable for forming processes, and the injection unit includes a barrel and an injection actuator, a hydraulic system for moving the injection actuator, an safety device configured to output an access signal when access detecting a person accessing the production plant and/or a possibility of a person accessing the production plant, and an electronic control unit to operate the hydraulic system in a production mode and in a safety mode. The control unit is configured to switch from the production mode to the safety mode when the access safety device outputs the access signal, and is configured to operate the hydraulic system in the safety mode such that the hydraulic system at least partially, preferably completely, counteracts an axial movement of the injection actuator caused directly or indirectly by an action of a molding compound present in the barrel on the injection actuator.

An injection molding machine (1) including: a bed (B); an injection device (3) provided to be movable with respect to the bed (B); a mold clamping device (2) provided on the bed (B); and a movement device (5) configured to move the injection device (3), in which the movement device (5) includes a hydraulic cylinder and a hydraulic pump for supplying a working fluid to the hydraulic cylinder, and the hydraulic pump is provided inside the bed (B).

A configuration of oil hydraulic power unit is simplified. In the oil hydraulic power unit, a port B and a port C are communicated to each other. By this, the hydraulic oil supplied to the port B can also be supplied to the port C even in exclusion of the solenoid valve and the flow-rate control valve, and, as a result, the hydraulic oil supplied to the port C contacts a side surface of the piston, and therefore, a backward pressure can be applied to the side surface of the piston. Thus, according to the oil hydraulic power unit, the backward movement of the piston can be achieved even in the exclusion of the solenoid valve and the flow-rate control valve.

An injection molding machine includes a screw to which a tag including identification information that is readable by a reading unit is attached, a drive unit that performs rotation and advancing and retreating of the screw, and a control device that controls the drive unit, the control device performs a control of moving of the tag to a reading position at which the identification information is read by the reading unit.

An injection apparatus of one embodiment includes a cylinder, a screw, and a drive mechanism configured to drive the screw. The drive mechanism includes a piston having a hollow piston rod, a connection rod having one end side inserted into the piston rod, the connection rod being rotatable with respect to the piston and movable integrally with the piston in a direction of a central axis of the piston rod, and a rotating body which is arranged around the connection rod and is driven to rotate around a central axis of the connection rod as a rotation axis. A plurality of external teeth are provided on the connection rod, and a plurality of internal teeth meshing with the external teeth are provided on the rotating body. Also, the screw is non-rotatably connected to the other end side of the connection rod protruding from the piston rod.

In one embodiment, a lifting apparatus includes a lifting plate on which an injection apparatus is mounted and a drive unit configured to move the lifting plate up and down relative to a base. The drive unit includes a feed screw made up of a screw shaft fixed to the base and a nut which supports the lifting plate and moves up and down integrally with the lifting plate while rotating.

An injection molding machine includes a screw provided in a cylinder having a nozzle at a tip so that the screw is allowed to be driven in a rotational direction and an axial direction, a drive device configured to drive the screw, and a control device configured to control an operation of the drive device, wherein the drive device has a rotatably provided ball screw shaft and a nut screwed onto the ball screw shaft and moved forward and backward in response to rotation of the ball screw shaft, and includes a ball screw configured to drive the screw in the axial direction by forward and backward movement of the nut, and the control device sequentially moves a screw position before injection and a screw position after injection in a molding process cycle so that a forward/backward movement range of the nut in the molding process cycle is dispersed.

A drive unit for a molding machine for longitudinally displacing a movable first machine component relative to a second machine component, includes a rotationally drivable spindle mounted in a linear movement-locking manner on the second machine component, a spindle nut arranged in a rotational movement-locking manner on the first machine component for positive-locking engagement with the spindle, and a fluid chamber which at least adjoins the spindle and/or the spindle nut, and contains a lubricant. A temperature control element for controlling the temperature of the lubricant is arranged in and/or on the fluid chamber at least in areas.

The drive mechanism for a screw of an injection cylinder comprises a front plate that includes a through hole and that is connected to the injection cylinder, a movable plate that rotatably supports the screw, a ball nut that is installed in the movable plate, a ball screw that engages with the ball nut and that drives the movable plate in the axial direction of the screw, a bearing that is installed in the through hole and that rotatably supports the ball screw, a support nut that is screwed into the end of the through hole on the opposite side of the front plate from the ball nut, and bolts that are supported by the support nut. The support nut includes threaded holes that are arranged circumferentially and that pass through the support nut in the axial direction. The bolts protrude from the threaded holes to press the thrust bearing.

An injection unit comprises an injection cylinder, a screw that is housed in the injection cylinder, a front plate that is connected to the injection cylinder, a movable plate that rotatably supports the screw, a ball nut that is installed in the movable plate, ball screws that engage with the ball nut and that drive the movable plate in the axial direction of the screw, a bearing that is supported by the front plate and that rotatably supports the ball screws, and a heat insulation material that is in contact with the front plate between the injection cylinder and the front plate.