Small eccentric crank connecting rod transmission mechanism with variable punch length

Abstract

The invention relates to a servo main punching head structure for a numerical control turret punch press and specifically relates to a small eccentric crank connecting-rod transmission mechanism with variable length of a punching head. The small eccentric crank connecting-rod transmission mechanism comprises a crankshaft and a striking rod; a motor for driving the crankshaft to rotate is arranged on an end part of the crankshaft; a connecting rod is arranged on an eccentric section of the crankshaft; a plunger is arranged on the end part of the connecting rod; a thread is arranged on the outer surface of the middle section of the plunger; a non-cylinder part is arranged on the lower section of the plunger; a nut is arranged on the outer surface of the plunger with a threaded section; the nut is in threaded connection with the plunger; a worm gear is arranged on the periphery of the plunger; and the plunger and the nut are axially encircled by the worm gear. The small eccentric crank connecting-rod transmission mechanism is reasonably designed. According to the design, an eccentric distance of a main eccentric section of the crankshaft is reduced, the crankshaft can rotate for a whole circle and the punching processing is not dependent on the frequently accelerating, decelerating and reversing of the motor, so that the property of a main driver and the frequency of the punch press are promoted, the motor and the driver are protected, the rotational inertia of a driving system is reduced and the energy consumption is reduced.

Description

technical field [0001] The invention relates to a servo main punch structure of a CNC turret punch press, in particular to a small eccentric crank connecting rod transmission mechanism in which the length of the punch is variable. Background technique [0002] The CNC turret punch press is the core equipment for sheet metal stamping processing. According to the main transmission mode, it can be divided into mechanical type, hydraulic type and servo main transmission type. Among them, the mechanical type and the servo main transmission type generally adopt the crankshaft connecting rod structure. One end of the connecting rod is installed at the eccentric position of the crankshaft, and the other end of the connecting rod is connected with the striking rod. The stroke of the striking rod in the prior art is relatively large. Some plates do not need such a large stroke. For this reason, the main transmission part of the servo motor is set with a pre-pressing point stamping to ...

AI Technical Summary

Problems solved by technology

Among them, the mechanical type and the servo main transmission type generally adopt the crankshaft connecting rod structure. One end of the connecting rod is installed at the eccentric position of the crankshaft, and the other end of the connecting rod is connected with the striking rod. The stroke of the striking rod in the prior art is relatively large. Some plates do not need such a large stroke. For this reason, the main transmission part of the servo motor is set with a pre-pressing point stamping to control the rotation angle of the crankshaft. The crankshaft swings back and forth within a certain angle range, and the motor needs to be continuously accelerated and decelerated. In order to achieve high stamping frequency, greater acceleration is required. In this way, the required instantaneous current is large, which is not good for the motor and driver, and is not conducive to energy saving. In addition, due to the large eccentricity of the crankshaft, the crank connecting rod The moment of inertia of the transmission system is large, and the inertia of the matching motor itself also increases, which not only increases the energy consumption of the entire motion system, but also reduces the dynamic response performance of the motor, which ultimately affects the processing performance of the punch press

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