Why does the irrigation machine make a lot of noise when starting and stopping?

In the early morning farmland, the shrill sound of the irrigation machine starting up often scares away a group of sparrows. This sudden noise not only disturbs the residents but may also indicate some problems inside the machine. Let's analyze the sources of these noises from a mechanical perspective and how to reduce the noise disturbance through daily maintenance.

The "protest" at the moment of activation

When the irrigation machinesuddenly starts from a stationary state, the motor needs to overcome a huge initial resistance. When the belt drive system suddenly tightens in a relaxed state, it will produce a crisp sound similar to that of a whip. The aged bearing loses lubricating oil after coming to a stop, and at the moment of startup, the metal directly rustles against each other, making a sharp sound. When the impeller of a Water Pump rotates from rest to high speed, the water hammer effect will cause resonance in the pipeline. These sounds combined together form the familiar start-up roar we know.

The "sigh" when the machine stops

When the irrigation system suddenly loses power, the high-speed rotating impeller of the water pump loses its power and decelerates sharply under the resistance of water. During this process, the inertia of the water flow in the pipe will form pressure waves, which will collide back and forth with the pipe wall and produce a "clang" sound. At the same time, due to inertia, the components of the transmission system stop asynchronously, and the meshing points of the gears will emit a "click-click" protest. If the motor braking system is not properly adjusted, the friction of the brake pads will also add a shrill high-frequency noise.

Connection points that are easily overlooked

Much of the noise actually comes from what seem to be secondary connections. A bracket with loose screws will make a regular "tap-tap" sound when vibrating. When the rubber shock-absorbing pad ages, a crisp "ding-dang" sound is produced when it directly collides with metal. If the flange of the water inlet pipe is not sealed tightly, it will make a "hissing" sound of air leakage as the pressure changes. These sounds are particularly pronounced during startup and shutdown, as the system vibrates most intensely at these times.

The noise reduction magic for daily maintenance

Regularly replenishing special grease for bearings can reduce the start-up friction sound by more than 60%. Check and adjust the tightness of the belt to avoid slippage if it is too loose or screeching if it is too tight. Gradually reducing the rotational speed before the machine stops and giving the water flow a smooth deceleration process can significantly alleviate the water hammer effect. Tightening all external screws once a month and replacing aged rubber gaskets - these simple maintenance tasks can bring unexpected noise reduction effects.