A base frame is used in an injection molding machine provided with a mold clamping unit having a platen, on which at least the mold clamping unit is placed and which supports the mold clamping unit. The base frame includes: a pair of main beams spaced apart from each other in a width direction of the base frame and extending side by side in a longitudinal direction of the base frame; and a platen attachment plate which is disposed on the main beams and to which the platen is attached, in which outer edge portions of the platen attachment plate in the longitudinal direction include welding points joined by welding to the main beams, and the platen attachment plate has a shape in which a length in the longitudinal direction is longer at an outer end than at an inside part in the width direction.

Disclosed is an electric mould opening and closing system for an injection moulding machine, includes a mould opening and closing driving device including a mould transferring mechanism, a brake mechanism, a mould clamping mechanism and a brake auxiliary mechanism having a first state and a second state. When opening or closing mould, driven by the mould transferring mechanism, the brake auxiliary mechanism and the mould transferring mechanism make the movable plate move forward or backward in a horizontal direction, and the mould transferring mechanism is separated from the mould clamping mechanism by the brake auxiliary mechanism, and the brake auxiliary mechanism is in the first state. When braking, a linkage is formed between the brake mechanism and the mould transferring mechanism, the brake auxiliary mechanism is in the second state, and the mould clamping mechanism locks the movable plate.

A clamping unit for a moulding machine with a toggle mechanism, in which a movable moulding platen is movable with respect to a stationary moulding platen and/or can be acted on by a force by the toggle mechanism. The toggle mechanism is drivable by at least two drive units, and the at least two drive units are each connected in an articulated manner to at least one movably mounted toggle lever element of the toggle mechanism via at least one bearing point formed as an articulation.

A hybrid core driving device of an embodiment includes: a cylinder tube; a first cover member at one end of the cylinder tube; a second cover member at the other end thereof; a rod in the cylinder tube, having a connecting portion at one end to be connectable to a core and an annular flange on the side of the second cover member, and penetrating the first cover member; a nut fixed to the rod; a screw shaft penetrating the second cover member and the nut and provided to be insertable into the rod; a motor rotating the screw shaft; a piston in the cylinder tube, allowing the rod to penetrate therethrough, and slidable with respect to the cylinder tube and the rod; and a connection portion connectable to a pipe supplying a hydraulic liquid to a region surrounded by the cylinder tube, the first cover member, and the piston.

A hybrid core driving device of an embodiment includes: a cylinder tube; a first cover member at one end of the cylinder tube; a second cover member at the other end thereof; a rod in the cylinder tube, having a connecting portion at one end to be connectable to a core and an annular flange on the side of the second cover member, and penetrating the first cover member; a nut fixed to the rod; a screw shaft penetrating the second cover member and the nut and provided to be insertable into the rod; a motor rotating the screw shaft; a piston in the cylinder tube, allowing the rod to penetrate therethrough, and slidable with respect to the cylinder tube and the rod; and a connection portion connectable to a pipe supplying a hydraulic liquid to a region surrounded by the cylinder tube, the first cover member, and the piston.

There is provided an opening/closing apparatus which can eliminate the influence of a slight gap formed between a bush and a pin in a link connecting portion of a toggle link mechanism and, in addition, can enhance workability e.g mold replacement,

An opening/closing apparatus according to an embodiment includes: a fixed platen 20 to which one mold 21 of a pair of molds is to be mounted; a movable platen 22 to which the other mold 23 is to be mounted; a pressure-receiving platen 24 connected to the fixed platen 20 via tie bars 36; an opening/closing mechanism for opening/closing the molds by moving the movable platen 22 back and forth, including a toggle link mechanism 28 connecting the pressure-receiving platen 24 and the movable platen 22; a first drive mechanism for driving the opening/closing mechanism; and a second drive mechanism 50 for applying a load to the movable platen 22 in a given direction in conjunction with the first drive mechanism.

There is provided an opening/closing apparatus which can eliminate the influence of a slight gap formed between a bush and a pin in a link connecting portion of a toggle link mechanism and, in addition, can enhance workability e.g mold replacement,

An opening/closing apparatus according to an embodiment includes: a fixed platen 20 to which one mold 21 of a pair of molds is to be mounted; a movable platen 22 to which the other mold 23 is to be mounted; a pressure-receiving platen 24 connected to the fixed platen 20 via tie bars 36; an opening/closing mechanism for opening/closing the molds by moving the movable platen 22 back and forth, including a toggle link mechanism 28 connecting the pressure-receiving platen 24 and the movable platen 22; a first drive mechanism for driving the opening/closing mechanism; and a second drive mechanism 50 for applying a load to the movable platen 22 in a given direction in conjunction with the first drive mechanism.

A mould-closing unit for an injection moulding machine for processing plastics has a mould support which is movable relative to a stationary mould support (10). A mould-moving device is provided to move the movable mould support into and out of closure of an injection mould. At least one force transmission element is connected to the movable mould support and at its end remote from the movable mould support has a section (14a) which is assigned to the stationary mould support (10) and can be actuated for operative engagement. The stationary mould support (10) is assigned a locking device (15), which can be moved into interlocking operative connection with the actuatable section (14a) to apply a closing force during closure of the injection mould. According to the method, these elements are used to create a method for locking a force transmission element to a mould support of the injection moulding machine. The fact that the locking device (15) has floating clamping jaws (16) which can be moved into interlocking operative connection with the actuatable section (14a) during closure of the mould to lock the force transmission element and the stationary mould support (10) and at the same time are connected to at least one piston (18) of a piston-cylinder unit (17) for applying the closing force, means that a mould-closing unit is created in which the locking mechanism for locking the tie bars to the mould support is integrated in a common unit with the unit for applying the closing force.

A mould-closing unit for an injection moulding machine for processing plastics has a mould support which is movable relative to a stationary mould support (10). A mould-moving device is provided to move the movable mould support into and out of closure of an injection mould. At least one force transmission element is connected to the movable mould support and at its end remote from the movable mould support has a section (14a) which is assigned to the stationary mould support (10) and can be actuated for operative engagement. The stationary mould support (10) is assigned a locking device (15), which can be moved into interlocking operative connection with the actuatable section (14a) to apply a closing force during closure of the injection mould. According to the method, these elements are used to create a method for locking a force transmission element to a mould support of the injection moulding machine. The fact that the locking device (15) has floating clamping jaws (16) which can be moved into interlocking operative connection with the actuatable section (14a) during closure of the mould to lock the force transmission element and the stationary mould support (10) and at the same time are connected to at least one piston (18) of a piston-cylinder unit (17) for applying the closing force, means that a mould-closing unit is created in which the locking mechanism for locking the tie bars to the mould support is integrated in a common unit with the unit for applying the closing force.

A mold clamping device includes a base, a stationary platen fixed to the base and supporting a stationary mold, a movable platen movable on the base and supporting a movable mold, and a mold clamping mechanism for clamping the movable mold against the stationary mold. Tie bars extend from the stationary platen completely through both the movable platen and the mold clamping mechanism. A shaft supporting plate is fixed to the base and has openings through which the tie bars slidably extend for supporting the tie bars. The shaft supporting plate terminates at its lower end portion in two spaced-apart shoes that are fixed to the base. The bottom surface of each shoe has a larger area than the cross-sectional area of the shaft supporting plate situated vertically above the shoe.