Explanation of the time relay of the precision four-column hydraulic cutting machine

Explanation of the time relay of the precision four-column hydraulic cutting machine
The time relay of the second-hand cutting machine is that when the input signal is added removed, the output part needs to delay limit the time to the specified time before closing disconnecting its controlled circuit relay. The time relay is a control device that uses electromagnetic principles mechanical principles to achieve delay control. There are many types of it, including air damping type, electric type electronic type.
In AC circuits, air damping time relays are often used. It uses the principle of air throttling through small holes to obtain delayed action. It consists of three parts: electromagnetic system, delay mechanism contact.
The time relay of the 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 large delay range (0.4~60s 0.4~180s), a simple structure, but low accuracy.
When the coil is energized (voltage specifications include AC380V, AC220V DC220V, DC24V, etc.), the armature the support plate are attracted by the core move down instantaneously, making the instantaneous action contact connected disconnected. However, the piston rod the lever cannot fall with the armature at the same time, because the upper end of the piston rod is connected to the rubber membrane in the air chamber. When the piston rod begins to move downward under the action of the release spring, the rubber membrane concave downward, the air in the upper air chamber becomes thin, causing the piston rod to slowly fall due to damping. After a certain period of time, the piston rod drops to a certain position, then the lever pushes the delay contact to act, causing the break contact to open the close contact to close. the time the coil is energized to the time the delay contact completes the action, this period of time is the delay time of the second-hand cutting machine relay. The length of the delay time can be changed by adjusting the size of the air chamber air inlet hole with a screw.
After the attraction coil is powered off, the relay is restored by the action of the recovery spring. The air is quickly discharged through the air outlet. The relay has the advantages of fast action, stable operation, long service life small size. It is widely used in power protection, automation, sports, remote control, measurement communication devices.