There are four types of pressure relays according to the structure of pressure displacement conversion components: plunger type, spring tube type, diaphragm type and bellows type. The user should understand its operating principle when selecting a pressure relay, and now take the commonly used plunger type as an example to clarify its operating principle.
The working principle of the pressure relay: The pressure relay is a hydraulic-electric signal conversion element that uses the pressure of the working fluid to open and close the electrical contacts. Electromagnets, relays, etc.). Complete the unloading or loading control of the pump. The sequential actions of the executive components, as well as the safety maintenance and interlocking of the system.
The operation process of the pressure relay of the four-column Hydraulic Press: the control port p is connected to the hydraulic system. When the system pressure rises to the setting value of the pressure relay, the hydraulic pressure acting on the plunger overcomes the spring force, and the ejector rod pushes up to make the micro switch When the system pressure drops below the set value, under the action of the spring force, the ejector rod and plunger move down to reset, and the micro switch recovers to the original position. Understanding the operating process of the pressure relay can make more effective use of hydraulic presses to improve operating efficiency.
Points for attention when using and repairing the pressure relay of the four-column hydraulic press:
- 1. The pressure relay uses oil pressure to push the micro switch to act, and then announces the electrical signal. Adjust the pressure A electrical appliance to the wheel pressing j to rotate clockwise, the required oil pressure will increase, and when the wheel is turned counterclockwise, the required oil pressure will decrease. After adjustment, the lock nut should be tightened.
- 2. The drain pipe should be directly returned to the fuel tank.
- 3. Replace the tension spring to get the required pressure regulation scale.
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