The fix is speed and clearance, and both have to be set before the first sheaf goes in. A soybean drum wants to run noticeably slower than a maize drum, fast enough to strip the pods and slow enough that the bean is rubbed out rather than struck. The concave is closed up so the gap is tight, because a wide gap lets pods pass through unthreshed and the operator responds by feeding faster, which is how you get splits.
The 3 kW soybean thresher is built for that job at a size a family farm can use: 200 to 400 kg/h on a single phase motor, 90 kg on the frame, 1250 by 750 by 1080 mm. It runs from a domestic supply, which in most of the soybean belt matters more than capacity, and two people can lift it onto a pickup.
Cleaning is the second half of the job. Beans come off the drum with pod halves, dust and broken stems, and a machine that threshes cleanly but discharges dirty still needs a hand screen afterwards. The unit carries a blower and sieves behind the drum, so what leaves the outlet is close to a sellable sample; the last step is drying, to 12 percent for storage and 13 percent for early sale.
Three habits protect the sample. Feed an even mat rather than a lump, because a slug of material is what jams the drum. Keep the moisture right: beans above 18 percent smear and block the concave, and beans below 12 percent shatter. And check the drum and rasp bars at the start of each season, because a worn bar rounds off and stops rubbing the pod properly, which is when operators start feeding faster to compensate.
The machine is used on soybean, and with the screen changed it will also handle cowpea, mung bean and small red bean, which is why it is bought by farms that grow more than one pulse. Zhengzhou Weiwei Machinery has built threshing machinery in Henan since 1980, with CE and ISO9001 certification, and we set the drum and concave for the crop at the factory rather than leaving it to the buyer. Tell us your crop and your daily volume through the website and we will confirm the settings with the machine.
If you need any assistance, you can contact our company via WhatsApp at +86 13526462915 to obtain the quotation.
