Self-adaptive portal frame of portal mobile machine tool

Abstract

The invention discloses a self-adaptive portal frame of a portal mobile machine tool, comprising a left upright post, a right upright post, a left sliding base and a right sliding base, wherein the left sliding base and the right sliding base are respectively positioned on longitudinal guide rails at two sides of a machine body, and the right upright post is rigidly and fixedly connected with thesliding bases; a support plate is arranged between the left upright post and the sliding bases, the support plate and the upright post arranged above the support plate are rigidly and fixedly connected and is in transverse sliding fit with the sliding base arranged below the support plate; and an inner circulating balance pressure cylinder is arranged at the outer side of the left sliding base, and the outer end of the support plate is connected with a piston rod of the cylinder. When the self-adaptive portal frame works and the whole stress of the portal frame reaches a certain value, the cylinder is automatically unloaded so as to ensure that the portal crane works normally without influencing the machining precision of the machine tool. The self-adaptive portal frame disclosed by the invention is simple and practical, is low in cost and convenient for debugging and installing and is beneficial to reducing the manufacturing difficulty and the installing and debugging difficulty of the machine tool.

Description

technical field [0001] The invention relates to a gantry frame, in particular to a gantry frame on a gantry mobile machine tool, in particular to a large gantry frame with self-adaptive capability. Background technique [0002] Gantry mobile machine tools are mostly large, heavy and ultra-heavy processing equipment, and the gantry frame on the machine tool is heavy and has a long stroke. In the prior art, the gantry frame of this type of machine tool is mainly composed of left and right columns, a top beam and a sliding seat rigidly connected. The sliding seats under the left and right columns are slidably matched with the fixed guide rails on both sides of the bed, and the frame is supported on the bed as a whole. The frame moves back and forth along the bed rails to process the workpiece. The gantry frame of this structure requires the parallelism of the guide rails on both sides of the bed, the overall rigidity of the gantry frame and the positioning accuracy are very hi...

AI Technical Summary

Problems solved by technology

The reason is that during the installation and operation of the machine tool, the change of the ambient temperature and the temperature change of the machine tool itself during the process of processing the workpiece will cause the physical deformation of the gantry frame and the guide rail of the bed due to thermal expansion and contraction. This deformation will inevitably affect the machining accuracy of the machine tool. When the deformation is too large, it will cause damage to the rigid connector, and in severe cases, it will also damage the machine tool. If the design, manufacture, installation and commissioning are not strict, the above consequences are unavoidable

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