Bottom drive double parallelogram infinite rotary bevel cutting head

Abstract

The invention relates to the field of plasma cutting, and particularly discloses a bottom-driven-type double-parallelogram unlimited rotation bevel cutting head. The bottom-drive-type double-parallelogram unlimited rotation bevel cutting head comprises a horizontal rack, a double-parallelogram mechanism, driving devices and a cage protection connecting piece, wherein the bottom of the double-parallelogram mechanism is movably connected with the horizontal rack through swinging connecting pieces; a horizontal connecting shaft group and a vertical rod group of the double-parallelogram mechanism are connected through revolute pairs to form a horizontal parallelogram mechanism; a vertical connecting rod group and a horizontal connecting shaft group are connected through revolute pairs, and the vertical connecting rod group, the horizontal connecting shaft group and the vertical rod group form a vertical parallelogram mechanism; the driving devices are used for driving the double-parallelogram mechanism to swing vertically and horizontally; the cage protection connecting piece is in movably connected with vertical connecting rods trough pin shafts. The vertical deflection as well as the leftwards and rightwards deflection of the bevel cutting head can be independently controlled through the double-parallelogram mechanism, so that winding between cables and pipelines can be avoided; the bevel cutting head has a simple structure, and is light in weight, lower in manufacturing cost, and more energy-saving.

Description

technical field [0001] The invention relates to an infinitely rotatable cutting device in the field of plasma or flame cutting, in particular to a bottom-driven double parallelogram infinitely rotatable bevel cutting head capable of infinitely rotatable cutting heads without the problem of pipe winding. Background technique [0002] According to the characteristics of the deflection and slewing mechanism, the cutting head currently used for full-turn bevel cutting on the cutting machine can be divided into cutting tool deflection plus bottom drive or top drive rotation, and bottom drive deflection plus top drive with a certain angle. There are three forms of double parallelogram structure of slewing and top drive. The characteristics of the three types of cutting head devices will be described respectively below. [0003] 1. Cutting tool deflection plus bottom drive or top drive rotation has the advantage of being able to directly reflect the groove state during cutting, an...

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Problems solved by technology

[0004] 2. Bottom drive yaw plus top drive slewing with a certain angle has the advantages of compact structure, light weight and good cutting accuracy; but its disadvantage is that the values ​​of yaw and slew need to be converted with the actual value, which cannot be reflected intuitively The bevel angle of the current cut and the angle of rotation, the rotation will cause the cable and air pipe connected to the cutting tool to become entangled

[0005] 3. The double parallelogram structure of the top drive has the advantage that the double deflection mechanism avoids the entanglement of the cable connected to the cutting tool and the air pipe, and its deflection value and rotation value can intuitively reflect the current cutting groove angle and rotation But its disadvantage is that the driving form of this mechanism is essentially equivalent to adding a set of parallelogram mechanism on the basis of a set of yaw mechanism in the first structure. The carrying capacity of the entire cutting machine is increased, and its lifting and traveling mechanisms need to be enlarged, requiring greater driving force and consuming more energy.

The structure of the entire cutting machine needs to be strengthened to ensure rigidity and precision, resulting in high cost of the entire mechanism and certain difficulties in marketing

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