Injection molding machine

Abstract

This technology provides the ability to detect uneven load distribution on the ball screw of an injection molding machine. [Solution] The injection molding machine comprises a ball screw that converts the rotational motion of a motor into the linear motion of a crosshead, a toggle mechanism having the crosshead and a pair of link groups that bend and extend with the advancement and retraction of the crosshead, a toggle support having a pair of mounting parts to which the pair of link groups are attached, and a strain gauge for detecting the strain of the toggle support. The toggle support has a pair of guide parts that guide the crosshead, a pair of arms that support the pair of guide parts, and a platen part on which the pair of mounting parts and the pair of arms are provided on one side. The pair of mounting parts are provided sandwiching a reference plane that includes the rotational centerline of the ball screw, the pair of guide parts, and the pair of arms. The strain gauge is attached to the one side of the arms or the platen part.

Claims

1. A ball screw that converts the rotational motion of the motor into the linear motion of the crosshead, A toggle mechanism having the crosshead and a pair of link groups that bend and extend as the crosshead moves forward and backward, A toggle support having a pair of mounting portions to which the pair of link groups are attached, A strain gauge for detecting the strain of the toggle support, Equipped with, The toggle support has a pair of guide portions that guide the crosshead, a pair of arms that support the pair of guide portions, and a platen portion on which the pair of mounting portions and the pair of arms are provided on one side. The pair of mounting portions are provided sandwiching the rotational centerline of the ball screw and a reference plane that includes the pair of guide portions and the pair of arm portions. The strain gauge is attached to one side of the arm or platen of the injection molding machine.

2. The injection molding machine according to claim 1, wherein the strain gauge is positioned away from the reference plane.

3. The injection molding machine according to claim 2, wherein the strain gauges are arranged on one side and the opposite side with respect to the reference plane, respectively.

4. The injection molding machine according to claim 1, wherein the strain gauge is attached to the arm and is mounted near one side of the platen.

5. Equipped with a control device, The injection molding machine according to any one of claims 1 to 4, wherein the control device detects an uneven load on the ball screw based on the detected value of the strain gauge.

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