Currently, small electric threshers are widely used, but many users struggle with poor threshing results due to improper adjustment. To ensure optimal performance and safety, here are the key points to consider when using an electric thresher.
1. Adjust the clearance between the roller's teeth and the concave screen bars—also known as the concave gap. If the gap is too large, the threshing will be incomplete, leaving a lot of chaff and grains in the straw. On the other hand, if the gap is too small, it can cause more grain breakage. Make sure to adjust the screen screws so that the gap is even and consistent. The inlet gap of the concave screen is typically 8–10 mm, while the outlet gap should be around 5–7 mm. After adjusting, check that the rotating drum moves smoothly and freely without any resistance.
2. Regularly check the tension of the belt. A belt that is too tight can cause overheating and potential damage, while one that is too loose may slip, leading to reduced efficiency and poor threshing. A loose belt also accelerates wear and tear, increasing the risk of breakage. Always inspect the belt for signs of aging or damage and replace it when necessary to maintain safe and effective operation.
3. Be cautious about electrical safety to avoid shocks. Always follow professional guidance when moving or installing the thresher. Before starting, carefully check all electrical connections and ensure that the insulation is secure and reliable. The motor must be properly grounded, and the insulation resistance between the windings and the housing should not be less than 0.5 megohms. Ensure that the power cable meets the required specifications. If the wiring is damaged or aged, replace it immediately. Never use the thresher in wet conditions, as this can lead to serious electrical hazards and potentially life-threatening shocks.
4. Follow safe threshing practices. Before starting, perform a full inspection of the machine, checking for free rotation and ensuring all bolts are tightened and in place. Remove any foreign objects from the straw before feeding it into the thresher, and only start feeding once you're certain the machine is fully operational. Feed the crop evenly, neatly, and continuously, avoiding overloading. If a blockage occurs, do not force the material through. After operating for 3–4 hours, take a break to check and tighten bolts, adjust belt tension, and lubricate moving parts as needed. These steps will help extend the life of your thresher and ensure safe, efficient operation.
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