Hardware characteristics of winding machine safety protection device

I. Selection of logic control chip In this project, the logic control chip is used to receive the input signal fed back by the sensor and output the corresponding control signal to the relay control module according to the feedback signal to reduce the winding speed. The logic control chip 74ls21p meets the control requirements of the project. The logic control chip 74ls21 consists of two groups of 4-input AND gates (positive logic). Typical values of its main electrical characteristics are: tPLH is 8ns, TPHL is 10ns, and PD is 9MW 2. Relay module automatic winding machine The electromagnetic relay used in this project is composed of iron core, coil, armature, contact reed, etc. As long as both ends of the coil are energized and pressed by a certain amount, a certain current will flow through the coil, resulting in electromagnetic effect. The armature is attracted by the iron core to overcome the tension of the reset spring armature, thus driving the moving contact and the stationary contact of the armature (often. When the coil is powered off, the electromagnetic attraction decreases and then disappears, and the armature returns to its original position under the reaction force of the spring, so that the moving contact and the original static contact (normally closed contact) are released.

In this way, the purpose of making and breaking the circuit can be achieved. The normally open and normally closed contacts of relay can be distinguished as follows: the static contact that is in the off state when the relay coil is not energized is called the normally open contact; A static contact in a conducting state is called a normally closed contact. 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 common terminal (COM) of the relay is connected with the normally closed terminal (NC). When the voltage across the relay coil reaches the pull-in, the common terminal (COM) of the relay is connected to the common terminal (no). -Winding machine manufacturer

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