a door frame

Abstract

The invention discloses a portal frame with the following key points in the technical scheme: the portal frame includes a transversal main beam and two supporting leg members that are respectively located at the two ends of the main beam; each supporting leg member includes an adjustment bolt and two supporting leg rods, wherein one ends of the supporting leg rods are hinged to two ends of the main beam, while the other ends are supported on ground; the adjustment bolt includes a bolt body, of which two ends are respectively provided with threaded parts in opposite rotation directions; the twosupporting leg rods of each supporting leg member are both provided with accommodating troughs; an adjustment piece is hinged in each accommodating trough; the threaded parts are threadedly connectedto the adjustment pieces. By rotating the bolt bodies, the included angle between the two supporting leg rods can be adjusted, and the ends, being far away from the main beam, of the supporting leg members may move far away from or closed to each other, thereby adjusting the vertical height of the main beam.

Description

technical field [0001] The invention relates to a crane support frame, in particular to a door frame. Background technique [0002] In the process of building construction, lifting equipment is often used, and its function is to lift the materials required for the building to the designated position. [0003] The portal frame of the traditional structure includes a main beam arranged horizontally, and a vertically downward outrigger is provided at both ends of the main beam, and the outrigger and the main beam are usually connected by bolts. Once connected, the outrigger The support angle and the support height of the entire main beam will be fixed and cannot be adjusted, which determines that the traditional door frame has a single function and cannot be applied to different uses. [0004] For different hoisting environments, the requirements for hoisting height are also different, and there is an urgent need for a door frame that can be adjusted in height. Contents of t...

AI Technical Summary

Problems solved by technology

[0003] The portal frame of the traditional structure includes a main beam arranged horizontally, and a vertically downward outrigger is provided at both ends of the main beam, and the outrigger and the main beam are usually connected by bolts. Once connected, the outrigger The support angle and the support height of the entire main girder will be fixed and cannot be adjusted, which determines that the traditional door frame has a single function and cannot be applied to different uses.

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