Hobbing type cross-cutting shear

Abstract

The invention relates to a hobbing type cross-cutting shear which belongs to the technical field of shearing machines for metal plates, comprises a closed frame comprising a left frame, a right frame, an upper crossbeam and a lower knife rest, an upper shear blade lifting mechanism, an arc surface sliding seat type hopping mechanism, a roll wheel-guide groove type guide mechanism, a hydraulic cylinder balancing mechanism, a shearing blade clearance adjusting mechanism and a mechanism for connecting an upper knife box and an upper knife rest, and is characterized in that the lifting of an upper shear blade is realized by the movement of upper and lower oblique wedges mounted on the lower surface of the upper crossbeam and the action of balancing a hydraulic cylinder. The pure rolling shearing of the upper shear blade is realized by the transverse movement of an arc surface sliding seat mounted on the lower surface of the lower oblique wedge and the constraint of the roll wheel-guide groove mechanism. The adjustment of the clearance between the shear blades is realized by the movement of the oblique wedges arranged before and after the upper knife rest. The hobbing type cross-cutting shear has the advantages that a rolling ball spiral mechanism is adopted for driving the oblique wedges to move, thereby greatly improving the carrying capacity of equipment. The arc surface slidingseat type mechanism and the roll wheel-guide groove type guide mechanism are adopted, thereby being capable of realizing the pure rolling shearing.

Description

Technical field: [0001] The invention belongs to the technical field of sheet metal shears, and in particular relates to a roll-cut cross-cut shear for cutting sheet metal. Background technique: [0002] At present, the roll-cut cross-cutting shears used for sheet metal shearing at home and abroad have mechanical transmission, that is, crankshaft-connecting rod transmission and hydraulic transmission, that is, through push rod-connecting rod transmission, with dual-axis and double eccentricity. and single-axis double-eccentric, they all have the following disadvantages: ① double-axis double-eccentric and single-axis double-eccentric rolling shears, the shearing mechanism belongs to the crank-link mechanism, from the analysis of the principle of motion, this transmission It is impossible to practice pure rolling shear in the form, and there is a rolling error. ②The main transmission system of the hobbing cut directly bears the shear force, and the shear force is proportional...

AI Technical Summary

Problems solved by technology

[0002] At present, the roll-cut cross-cutting shears used for sheet metal shearing at home and abroad have mechanical transmission, that is, crankshaft-connecting rod transmission and hydraulic transmission, that is, through push rod-connecting rod transmission, with dual-axis and double eccentricity. and single-axis double-eccentric, they all have the following disadvantages: ① double-axis double-eccentric and single-axis double-eccentric rolling shears, the shearing mechanism belongs to the crank-link mechanism, from the analysis of the principle of motion, this transmission It is impossible to practice pure rolling shear in the form, and there is a rolling error

②The main transmission system of the hobbing cut directly bears the shear force, and the shear force is proportional to the square of the thickness of the plate, which will cause the power parameters of the main drive, motor power, equipment weight, and equipment investment to increase with the increase of the plate thickness. Large and sharp increase, when the thickness of the plate increases to a certain extent, the equipment will not be able to meet the requirements of rolling cutting, which greatly limits the production capacity of the shearing machine

③Because the rolling cutting of the upper shearing edge and the overlapping amount and opening degree of the upper and lower shearing blades are all realized by the rolling cutting mechanism, when the structural parameters of the shearing machine are determined according to the design of the largest steel plate, the shearing machine can only Shearing is carried out in a fixed mode, but the relevant process parameters cannot be adjusted reasonably according to the steel plates of different specifications, thus limiting the improvement of the efficiency of the shearing machine

④Rolling shears will produce a unique peak shear force, which is about 1.6 times the stable shear force, which is very unfavorable to the strength of the equipment

⑤ The structure of the cutting blade gap adjustment device is complex, and the accumulated error of the transmission is large, which affects the adjustment accuracy

⑥The upper knife box is fixed by a spring oil cylinder. The oil cylinder has a large specification and a large number, and the system pressure is high, which is prone to accidents where the upper knife box falls

⑦Fully hydraulic rolling shears, although the mechanical part of the shearing machine is simplified, but the high pressure and large flow rate make the hydraulic system huge, the cutting efficiency decreases, and the electronic control system is very complicated

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