There are two main causes of the failure of the corn harvester: First, accidental malfunction caused by improper operation is caused by human beings. Generally, it is easy to avoid and prevent. The second is the sudden failure caused by the excessive wear of certain parts of the machine during long-term use. It is due to natural wear and tear. The use of active preventive measures can avoid and reduce the probability of failure. The following are several typical causes and prevention of failure: 1. Cutting blade damage encountered in the cutting process, stone, tree roots and other hard objects; blade protector loose or deformed, so that the level of the blade is inconsistent; blade rivets loose, when cutting Collisions, etc. may cause damage to the cutting blade. In order to prevent damage to the blades, attention should be paid to the obstructions in front of the cutter to prevent the blades from cutting hard objects such as iron wires or colliding with stones, poles, stakes, etc. During maintenance, always check and adjust the blade guard so that the stationary blade is in the same horizontal plane. Loose blades must be riveted in time.
2. The cutter bar breaks mainly because the cutter movement resistance is too large or the knife drive mechanism is not installed correctly. In order to prevent the cutter bar from breaking, the cutter should be adjusted correctly so that the movement resistance of the cutter can be reduced, and the installation position of the cutter drive mechanism can be adjusted to meet the assembly requirements. After the cutter bar breaks, replace the spare cutter and repair the broken cutter bar. After the wheat is harvested, the unloaded cutter should be placed on a flat rack in the warehouse or vertically attached to the beam in the warehouse to avoid bending and deformation of the cutter bar.
3. Header Screw Auger The gap between the spiral blade of the auger and the bottom plate of the header is too large. Especially when harvesting thin wheat, the blades cannot grasp the cut crops and cannot transport them in time. Accumulation and blockage before the vehicle caused the header auger to slip. In order to prevent the occurrence of this failure, the gap between the spiral blade and the header plate should be properly adjusted according to the conditions of crop density, height, etc. When the edge of the blade is polished, the efficiency of transportation will be reduced, and a flat spade or trowel may be used. Small teeth are machined to increase their gripping and pushing capabilities.
D. The roller jams the crop too wet, too dense, weeds are numerous; walking speed is too fast; the threshing gap is small, or the drum speed is low; the transmission belt slips; the engine horsepower is insufficient; the draft wheel and the document-finishing device do not slip; Inequality can cause roller jams. In order to prevent the clogging of the rollers, in the harvesting of wet grass crops, the gap between the roller and the gravure plate should be increased in an appropriate manner. When hearing the descent speed of the drum speed, the locomotive forward speed should be reduced or temporarily stopped; the tightness of the transmission belt should be adjusted; Adjust the rotation speed of the drum and the clearance of the skid bearing. If the drum is clogged, turn off the engine, place the indented plate in the lowest position, and pull the roller belt to clean the plug.
V. The main reason why the drum is not clean is mainly due to the low drum speed, the large gap between the concave plates, the excessive feeding amount of the crop, or uneven feeding; the excessive wear of the spiked teeth, pattern bars and concave grid bars, and the reduced threshing ability, or The deformation of the intaglio plate caused a lack of threshing; the harvesting time was too early, the crop was too wet, and the threshing was difficult, resulting in a lack of threshing. For the above failure can increase the drum speed, reduce the gap between the concave plate, or reduce the advance speed of the corn harvester; replace the nail teeth, pattern bar, concave plate; appropriate to increase the drum speed and reduce the amount of feed, can improve the de-purchase rate.
6. Sieve jamming is mainly due to improper adjustment of the threshing device, too many broken stems, the fan does not blow out, so that the front screen hole is broken by stems and spikes, causing overload or blockage of the auger. The improper adjustment of the cleaning device, the small opening of the sieve, the small amount of wind, the improper adjustment of the wind direction, the insufficient amplitude of the screen or the incorrect inclination of the sieve, resulting in more grains in the sieve surface discharge and increased cleaning loss; too much wet crops or weeds, As a result, the cleanliness is reduced. For the above faults, the feeding amount should be appropriately reduced, the rotating speed of the drum should be reduced or the threshing gap should be increased, the air volume should be increased and the wind direction should be changed, and the gap between the screen surface should be adjusted to improve the clogging of the screen surface and the auger; the opening degree and air volume should be adjusted; Change the inclination of the tail screen and increase the speed of the drum.
7. The chain is not suitable for the tightness of the broken chain; the chain is eccentrically worn; the drive shaft is bent and the sprocket yaw; the chain continues to be used after severe wear; the sprocket wear exceeds the allowable limit; the split pin of the sleeve roller chain breaks off, or The direction of the opening of the joint clip is reversed; if the hook chain wears badly or is reversed, the chain will be dropped, broken and disengaged. In order to prevent the occurrence of this failure, the sprocket in the same transmission circuit must be in the same plane of rotation; the wear of the chain of the corn harvester is often inspected and repaired and replaced in time; the condition of the cotter pin of the chain joint is often inspected and replaced if necessary. Straighten the curved drive shaft so that the sprocket does not exceed the allowable amount of swing; correct adjustment of the tightness of the chain; timely repair and replace the sprocket over the wear limit, correctly adjust the safety clutch; timely lubrication of the drive chain.
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