Triangular connecting rod-toggle rod transmission mechanism with large force magnification ratio for servo press

Abstract

The invention discloses a triangular connecting rod-toggle rod transmission mechanism with a large force magnification ratio for a servo press. The mechanism comprises a servo motor, an upper pin shaft, an upper toggle rod, a triangular connecting rod, a crank, a middle pin shaft, a lower toggle rod, an unloading oil cylinder and an ejecting oil cylinder, wherein the output shaft of the servo motor is connected with the crank through a transmission mechanism; the crank is connected with the connecting rod; the connecting rod is connected with the upper toggle rod and the lower toggle rod respectively; the upper toggle rod is hinged and fixed on the machine body; the lower toggle rod is connected with a slider capable of linearly reciprocating up and down along a guide rail of the machine body through a wedged overload protection block and the unloading oil cylinder; the upper toggle rod and the lower toggle rod have different lengths and are asymmetric; and the connecting rod is triangular. As symmetric toggle rods are changed into asymmetric toggle rods, and a linear connecting rod is changed into the triangular connecting rod, a relatively large force magnification ratio is obtained, the drive torque required by the crank is remarkably reduced, and the capacity and cost of the servo motor are reduced under the condition of guaranteeing compact structure of the machine body, enough stroke of the slider and monotonous descending of the slider.

Description

technical field [0001] The invention is a triangular link-toggle link transmission mechanism with a high boost ratio for a servo press, belonging to an innovative design in the field of mechanical transmission. Background technique [0002] The traditional crank press relies on the flywheel to store and release energy to do work to complete the stamping work, and the choice of the motor is selected from the perspective of work. The motor drives the slider to reciprocate up and down through the transmission mechanism, and the energy is guaranteed by the flywheel design. The CNC servo press has no flywheel, and the drive torque is directly output by the servo motor. The working pressure is mainly generated by the instantaneous torque of the motor, so the motor capacity is large, which increases the equipment cost. Improving the transmission mechanism and reducing the driving torque of the motor are of great significance for reducing the capacity of the servo motor, reducing t...

AI Technical Summary

Problems solved by technology

The crank connecting rod has the advantage of simple structure, but the nominal pressure stroke is small and the booster ratio is small, so it can only be applied to small servo presses, such as the press disclosed in Chinese Patent No. 200810026253; although the symmetrical toggle has an idle stroke Quick return and working stroke are similar to stop characteristics, but the booster ratio is still not large enough, such as the mechanism disclosed in Chinese patent No. ZL 200720054117.3 and ZL 200820082737.2; while the multi-link mechanism can improve the kinematic characteristics of the slider in the working stroke, there is still The boost ratio is not optimal and the structure is complicated, such as the mechanism disclosed in Chinese Patent No. ZL 200820030514.1

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