Grain combine harvester general technical conditions

I. Technical Requirements for Main Components The main components of the cutting, threshing machine and transmission parts should meet the following requirements. (I) Cutting device 1. After the heat blade and the stator blade of the cutter are heat-treated, the hardness toothed blade in the quenching zone is HRC48-58, the light blade is HRC50-60, and the hardness blade in the non-hardened zone is 3 mm from the edge of the hole. The quenching is not allowed within 2mm from the hole of the insert and its hardness is HRC ≤ 35. The blade thickness of the toothed blade is not more than 0.1mm. The unevenness of contact between the moving blade and the stationary blade is not more than 0.2mm, and the roughness of the working surface is 3.2. The working face blade is 10mm from the blade edge, and the fixed blade is within 3mm of the blade, and no burn spots are allowed. 2. The front of the cutting gap should be in contact with each other, with a gap of not more than 0.5 mm; 0.5-1 mm clearance is allowed, but the number cannot exceed one quarter. Back end clearance is not more than 1mm. Type II, III, and IV rear clearances are allowed to be no more than 1.5mm, and Type IV front-end gaps are no more than 0.75mm. (b) The threshing drum 1. Radial full-beat shearing flow pattern of the bar-type threshing drum is not more than 1.5mm axial flow type is not more than 3.0mm. 2. The radial difference between the tops of all the teeth of the spike gear and the finger-type gear barrel is in the range of ±2mm. 3. The radial runout of the circumference of the inlet end of the bow-type threshing drum is not more than 1.5mm, the radial runout of the middle circumference is not more than 2.0mm, and the roundness of the end surface of the inlet end is not more than 1.5mm. 4. The threshing drum should be equilibrated. The balance of full-feed grain harvesting should reach G6.3, and the static balance of the half-feed grain combine harvester should not exceed 1.5XI0-2mm. (3) Concave plate 1) The grid-type gravure grid-type quadruple plate has a twist degree (bar code drum) of not more than 1.2mm. When the working surface is checked with a template, partial clearance is allowed: finger teeth (plate teeth) , bow teeth, nail teeth) drum is not more than 3mm; rib roller (cutting flow) is not more than 1.5mm, rib roller (axial flow) is not more than 3mm. The diagonal difference of the grid plate concave plate: When the concave plate length is less than or equal to 900mm, it should be less than 2.5mm, when the concave plate length is greater than 900mm, it should be less than 4mm. 2) The nail teeth on the concave plate and the nail plate on the concave plate should be securely fixed. The height difference of the spike teeth should not exceed 2mm. The perpendicularity of the spike axis to the rolling axis is no more than 1mm. 3) The working surface of the gravure plate of the woven screen gravure plate is allowed to have a partial clearance of not more than 4 mm when examined with a template. (4) The manuscript shall be flexible and its rotational torque shall not exceed 36Nm. (5) The screening of the grain clearance room shall be convenient, and the adjustable screen shall be closed tightly with a partial gap of not more than 3mm. (6) Transmission part 1) In the open type transmission, the position of the center plane of the same return pulley is not greater than 0.3% of the center distance when the center distance is less than or equal to 1000 mm, and is not greater than 0.5% of the center distance when the center distance is greater than 1000 mm. 2) The gears of the transmission gear pair are in good contact. It is not allowed to touch the diagonal line or touch one end. The height of the contact point should not be less than 40%; the width should not be less than 50%. 3) Fully fed into the combine harvester casting stepless speed change belt pulley, the pulley, fan impeller and lift pulley with the brick speed over 400r/min or more than 5kg should be statically balanced, and the unqualified product quality should be Gl6; The unbalanced load of the combined harvester fan (with pulley) is 1.0Xl0-2Nm. (7) Welding quality Each welding place is not allowed to burn through, missed welding and desoldering defects. Other weld defects allow no more than 5 points for 3 points per joint. Second, the main performance indicators Each complete assembly of the combine harvester must be carried out to test the production of the combine harvester, assembly quality and necessary work organization adjustments. After inspection by the manufacturer's quality inspection department, the company can issue the certificate before leaving the factory. If the test is conducted, it should meet the main performance indicators. (I) Operational performance 1. The full-feeding grain combine harvester has a maximum continuous feed amount, no weeds above the cutting line, crop upright, wheat straw grass-to-grain ratio of 0.8-1.2, and grain moisture content of 10%-20%; The rice straw grass-to-grain ratio is 1.0-2.4, and the grain moisture content is 15% to 28%. The operating performance should be in accordance with Table 25. (b) The average reliability of failure-free working hours. Self-propelled grain combine harvester with hydrostatic drive and feed ≥5kg/s for no less than 40 hours; effective feed rate. Self-propelled grain combine harvesters have dried up to 90%; trailing, suspended semi-feeding and grain-feeding combine harvesters are not less than 92%. (3) Passing performance 1) The average grounding pressure on the soil per unit area of ​​the tracked walking part is not more than 24 kPa. 2) The minimum ground clearance shall meet the requirements of field operations and pass requirements. The self-propelled type shall be less than 250mm, and the traction type and suspended type shall not be less than 200mm. (D) noise dynamic environment noise is not greater than 89dB (A). Ear noise. Not more than 90dB(A) with sealed cab; 94dB(A) without cab or simple cab. (E) Braking performance Wheeled grain combine harvester braking performance cold deceleration: ≥ 2.94m/s2; thermal deceleration: ≥ 1.74m/s2; brake pedal force ≤ 800N or 4.5 m deceleration At /s2, the rear wheel must not jump. Parking brake performance. The grain combine harvester must be reliably stopped on a 20% (11o8') hard dry longitudinal ramp. (6) Hydraulic system performance When the cut-valve hydraulic lifting mechanism is in working condition, the lifting speed is 0.2-0.4 m/s; the descending speed is 0.15-0.25 m/s; the static settlement of cutting valley should not exceed l0mm. (7) The transmission performance shall be measured in the state of transport. During the whole process of measurement, the clutch shall be reliable and completely separated. When the gearbox is working in all gears, there shall be no chaos and off-gear phenomenon. The transmission system shall not have abnormal noise. (8) Sealing performance The engine, hydraulic system, and transmission box of the grain combine harvester must not leak oil, leak water, or leak air, and grain cutting and threshing machine bodies must not leak food. (9) Appearance quality The thickness of the lacquer layer shall not be less than 35 μm. The adhesion of the coating shall be 2 or more. The color shall be uniform, smooth, and free from leaks.

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