Explanation of time relay of precision four column hydraulic cutting machine

Explanation of time relay of precision four column hydraulic cutting machine

The time relay of second-hand cutting machine is that when the input signal is added removed, the output part needs to delay limit time to close disconnect the controlled line relay until the specified time. Time relay is a kind of control appliance which uses electromagnetic principle mechanical principle to realize delay control. It has many kinds, such as air damping type, electric type electronic type.

Air damping time relay is often used in AC circuit. It uses the principle of air throttling through small hole to obtain delay action. It consists of electromagnetic system, delay mechanism contact.

The time relay of second-hand cutting machine can be divided into two types: power on delay type power off delay type.

The air damping time relay has a wide time delay range (0.4 ~ 60s 0.4 ~ 180s). It has simple structure but low accuracy.

When the coil is electrified (the voltage specification is AC380V, AC220V dc220v, DC24V, etc.), the armature supporting plate are attracted by the core move down instantaneously to make the instantaneous action contact on off. However, the piston rod lever can fall with the armature at the same time, because the upper end of the piston rod is connected with the rubber membrane in the air chamber. When the piston rod starts to move downward under the action of the release spring, the rubber membrane will be concave, the air in the upper air chamber will become thin, so that the piston rod will be damped slowly drop. After a certain period of time, when the piston rod drops to a certain position, the delay contact is pushed by the lever to open the dynamic breaking contact close the dynamic closing contact. the coil power on to the delay contact complete action, this period of time is the second-hand cutting machine relay delay time. The length of delay time can be changed by adjusting the size of air inlet hole with screw.

After the suction coil is de energized, the relay is restored by the action of the recovery spring. The air is rapidly discharged through the air outlet. The relay has the advantages of fast action, stable operation, long service life small volume. It is widely used in power protection, automation, movement, remote control, measurement communication devices.