Mechanism movement process of fiber laser cutting machine
Most AC asynchronous fiber laser cutting machines have problems such as lag in braking response and poor consistency of braking response in the motor. The impact is that when the lifting platform performs a braking operation when the load is lowered, the motor is powered off Later, due to the lag of the braking response time, the motor will brake only after the lifting platform is in a weightless state and accelerates downward for a certain distance, which will cause a great impact on the entire transmission mechanism. In addition, if the braking of the two motors is not synchronized, one of the motors has already braked during the braking process, while the other motor is still in a free state after power failure, because all the braking torque is transmitted through the inside of the mechanism , It will inevitably bring additional impact load to the components of the transmission system 1. Therefore, in the mechanical design process, two motors with fast braking response time and good braking response consistency should be selected as much as possible.
During the movement of the fiber laser cutting machine mechanism, when the eccentric shaft and the eccentric gear axis are at the same height, the transmission angle of the mechanism yu003d0. , The mechanism is in a locked state. Therefore, during use, it is necessary to avoid starting and stopping operations at the dead point as much as possible.
Kinematics simulation is a dynamic model established in ADAMS. The load weight is j000kg. The drive motor rotates at a uniform speed of 1450r/min, the speed ratio of the reducer is 28.4, and the speed ratio of the gear reduction is 1:6. The eccentricity of the eccentric gear is 105mm.
Through the kinematics simulation of ADAMS, the speed change curve and driving torque change curve of the elevator platform are obtained. During the lifting process, the changes in the lifting speed and driving torque conform to the sinusoidal distribution. When the lifting platform is at the upper and lower limit points, the lifting speed and driving torque are both from the previous page 103)
(2) Safe and stable operation. The eccentric mechanism can achieve 360 u200bu200bdegrees. Even if there is an electrical failure, the rotary motion within the range will not cause a mechanical collision and cause a safety accident. When the lifting platform is at the upper limit position, the mechanism is in a self-locking state under the action of gravity, and a small braking torque can ensure that the lifting platform will not fall down. The speed curve and driving torque curve of the mechanism conform to the change law of the sine curve, which can greatly reduce the impact during the start and stop process.
(3) The stroke of the fiber laser cutting machine is fixed, positioned and easy to control. The stroke of the mechanism is 2 times the eccentricity, and when it is located near the upper and lower limit positions, its height is little affected by the change of the eccentric gear angle, and it is easy to position the limit position control; when it rises to 1/2 of the stroke ( When the eccentric shaft and the eccentric gear axis are horizontal), the lifting speed reaches a greater value of 93mm/s, and the driving torque also reaches a greater value of 7.52Nm.