There is a proximity switch on the warp knitting machine spindle

Update:25-09-2019
Summary:

The EL bar traverse system consists primarily of a spin […]

The EL bar traverse system consists primarily of a spindle with an inner core of iron and a coil around the outside. When the current is passed, the coil generates a magnetic field that causes the iron core to move linearly, thereby transmitting the traverse motion directly to the yarn guide comb. The traverse motion is based on the motion curve of the bar, and the traverse distance is calculated by the computer, and the linear motor is traversed. There is a proximity switch on the warp knitting machine spindle, which can be regarded as a spindle angle encoder. The angular position of the spindle is now collected and transmitted to the main control computer. The computer can determine the traverse time according to this information and realize the traverse. The mechanism is synchronized with the warp knitting machine spindle, and the spindle, the coiling mechanism and the traverse mechanism are always coordinated.

Due to electrical reasons, the machine speed is limited, and the EL type bar traverse mechanism is adapted to a machine speed of up to 1500 rpm, which does not completely replace the faceplate cam traverse mechanism. However, the performance is improved by 30% compared to the conventional method, and there is a larger traverse pitch. Taking the E28 machine as an example, the needle back can be moved up to 12 stitches, the maximum cumulative traverse distance can reach 50mm, and the operation is stable and reliable.

The ELS type bar traverse mechanism uses electro-hydraulic servo control. The electro-hydraulic servo control system is composed of a command component, a detecting component, a comparison component, a servo amplifier, an electro-hydraulic servo valve, a hydraulic actuator, and the like. The principle of the ELS type electronic bar traversing mechanism is as follows: the industrial computer as the command component issues a command according to the pattern requirement, and the linear motor is controlled to drive the electro-hydraulic servo valve by the signal amplification of the servo amplifier, and the linear motor is respectively turned on and off according to the control signal. The electro-hydraulic servo valve controls the flow of oil into the hydraulic cylinder (ie, the hydraulic actuator), thereby moving the piston rod of the hydraulic cylinder, and then driving the comb to move laterally through the connecting rod. The measuring system is used for continuously measuring the position of the bar and feeding back to the industrial computer. The industrial computer compares whether the feedback signal meets the traverse requirement, and if the deviation continues to drive until the actuator reaches the command requirement. This constitutes a closed-loop system that guarantees high accuracy and reliability of the bar traverse. The hydraulic cylinder has a double working effect, that is, the reciprocating motion of the comb is controlled by the corresponding oil pressure, and the return spring is not used as the adjusting component, and the machine structure is more compact.

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