As long as dyeing machine a certain voltage is applied […]
As long as dyeing machine a certain voltage is applied to both ends of the coil, a certain current will flow in the coil, which will produce electromagnetic effects. Under the action of electromagnetic force, the armature will overcome the pull force of the return spring and attract to the core, thereby driving the armature. The moving contact and the static contact are normally open contacts. When the coil is de-energized, the electromagnetic attraction will also disappear, and the armature will return to its original position under the action of the spring's reaction force, releasing the moving contact and the original static contact. In this way, the pull-in and release can achieve the purpose of conducting and cutting off in the circuit. Regarding the normally open and normally closed contacts of the relay, it can be distinguished as follows: the static contact in the off state when the relay coil is not energized is called the normally open contact; the static contact in the on state is called the normally closed contact point.
Relays generally have two circuits, namely a low-voltage control circuit and a high-voltage working circuit. When there is no voltage or insufficient voltage at both ends of the relay coil, the relay's characteristics such as low price, easy assembly and convenient use can be widely used in many occasions such as robot avoidance, assembly line piece counting and so on. The output state of is which is the high level and low level in the digital circuit. When no object is detected, it outputs high level and when an object is detected, it outputs low level and 0.7 V. Its electrical characteristics are as follows: working voltage is 5 V, working current is 10 mA, and signal output is level. The sensing distance is. The size is. When wiring diagram, output signal needs to add pull-up resistor. The characteristic is that the output signal is stable, not affected by visible light, and has a long life.
When the switch button of the safety protection device is pressed, the red indicator light of the safety protection device is on, and the red power LED indicators of the two relays are on, and they are in a normal non-operation state. The resistor is not connected to the pedal speed control loop, and the winding machine works stably. When the operator moves his hand to the detection range of the secondary infrared digital obstacle avoidance sensor, the secondary relay will act, the normally closed contact is disconnected, the normally open contact is closed, the corresponding yellow LED indicator light is on, and the pedal is adjusted. The adjustable resistor R1 is connected in series in the speed loop to increase the total resistance, which causes the voltage source U of the analog voltage input to the winding frequency converter to decrease, and the frequency of the winding frequency converter is reduced accordingly, and the speed n of the winding motor is also reduced.
That is, the speed of the wire storage ring is reduced, and the safety of workers' operation is also improved. When the worker's hand continues to move to the wire storage ring and enters the detection range of the first-class infrared digital obstacle avoidance sensor, the first-class relay will act, the normally closed contact is disconnected, the normally open contact is closed, and the yellow LED indicator lights are all on. The adjustable resistors R1 and R2 are connected in series in the pedal speed control loop to increase the total resistance to the maximum, which causes the voltage source U of the analog voltage input to the winding inverter to drop to the lowest adjustable value. It is minimized. At this time, the speed n of the winding motor is further reduced, that is, the speed of the wire storage ring is also reduced to a lower speed, and the safety of the worker's operation is once again improved.