1. The following measures shall be taken for the ventilation ducts between cooling radiator radiator chips covered by dust and grass clippings and obstruction:
(1) Change the cooling air inlet position. At present, the cooling wind of the medium and small wheeled tractor engines is drawn from the front of the tractor to the radiator radiator by the cooling fan. During the harvesting operation, the debris on the front of the header due to cutting, conveying dust, grass clippings, etc. is easily absorbed by the front windshield of the locomotive onto the radiator cooling chip. In order to change this situation, we must try to change the inlet position of the cooling air, so that the air inlet is higher than the front hood of the tractor, so that the dust and grass clipping of the header will not easily enter the radiator of the radiator, delaying the effect of increasing the temperature of the water. .
(2) Install a dust-proof plate at the air inlet (about 10 centimeters or so), the area is larger than the front area of ​​the tractor housing, and the periphery should be bent slightly backwards. In this way, the dust and grass clippings raised at the front end of the header are mostly blocked by the dust panel or guided around the inlet. At the same time, it is still necessary to replace the original windshield net with a wire mesh of about 40 mesh, and block it with wire mesh where it may enter the air. This will greatly reduce the amount of dust, grass clippings, etc. that can be inhaled, and it can also delay the rise of water temperature. high.
(3) The auxiliary tank is added at the same time when the dust cover is set to increase the capacity of the cooling water, thereby delaying the temperature rise of the cooling water.
(4) Change the cooling water tank placement. Remove the original cooling water tank and design a bracket to place the water tank and fan above the top of the same vertical plane of the original water tank. The height is not suitable for the eyes of the operator, and the engine and the water tank are connected in the original circulation and used with appropriate length. The V-belt connects the fans. This method can improve the working conditions of the cooling water tank. Not only dust and grass clippings are not easy to adhere to radiator radiators, but also the ventilation conditions are greatly improved. This method also has a good cooling effect.
(5) In the absence of any means, the front cover of the tractor can be temporarily removed to allow the engine and cooling system to be directly exposed to the air. This also has a certain cooling effect, but it looks very unsightly and should not be used under normal circumstances.
2, is strictly prohibited overload operation, high temperature season load control is about 90%, to waterproof temperature is too high.
3, the engine should be filled with clean soft water, the operation should always check the water tank for lack of water and leakage.
4. Check and adjust the tension of the fan belt according to the requirements of the instruction manual to ensure that the fan should have a rotating speed and supply sufficient air volume to cool the water tank or the body.
5, for a long time use of the engine should be fully cleaned cooling system, remove scale. When cleaning, first remove the thermostat, then press the 20 kg of water, 1.5 kg of caustic soda, 0.5 kg of kerosene to prepare the cleaning solution. After the engine is injected into the water tank, start the engine and run at a fast speed for 5-10 minutes until the water temperature rises. Turn off at 70-80°C, stand for 10-12 hours, start the engine, run at medium speed for 5-10 minutes, then turn off the heat, let go the cleaning fluid, add fresh water, and run at medium speed for 4-5 minutes. To flush the cooling system, after cleaning two or three times, replace the thermostat and add enough cooling water.
6. Check the work performance of the thermostat and remove it if necessary (in high temperature weather) to prevent the thermostat from malfunctioning and affect the normal circulation of the cooling water and reduce the cooling function.
7. For pumps with longer working hours, inspect the impeller and pump housing bore, the wear of the water pump shaft and bearings, and the water seal assembly. If the wear is severe, it will result in insufficient water discharge and affect the circulation of cooling water. At this time, it needs to be repaired in time.
8. Test the tightness of the engine against the valve for a long time and properly check and adjust the valve clearance. If the valve seal is not good, it will cause leakage of high-temperature and high-pressure gas, causing the engine temperature to rise. The main reason for poor sealability is generally poor contact between the valve seat and the valve, and weak spring force. If the valve is not closed properly, repair it promptly.
9, to adjust the fuel supply advance angle accurately, to ensure the timing of fuel supply. Long-term use of fuel injection pump, the camshaft, roller and follow-up column and other parts of the wear is serious, it will cause the fuel supply time is too late, resulting in late injection of diesel into the cylinder can not completely burn, or cause post-combustion, so that the engine overheating. Therefore, it is necessary to check and adjust the fuel supply advance angle in time.
10. Check and adjust the injector so that the injection pressure, atomization and spray cone angle meet the specified requirements. If the atomization of the injector and the spray cone angle are not good, the fuel and air will not be well mixed, resulting in a decrease in the burning speed, prolonging the burning time, and causing the engine temperature to rise.
11, must be considered in the design. Because the combine harvester has a long working time, high ambient temperature, poor ventilation, and slow walking speed, working under such severe conditions makes the engine cooling system's working ability particularly important. The cooling capacity should be determined by designing the engine at high temperature and full load conditions. In order to increase the cooling capacity, it is recommended that the following two issues should be considered: On the one hand, it is necessary to increase the volumetric efficiency of the fan, increase the drive capacity of the fan drive belt, reduce its slip rate, select the best ventilation position, and reduce the circulation resistance of the cooling air. Increase the amount of air intake; on the other hand, it is necessary to start with improving the structure of the fan blades and designing the streamlined wind shields to increase the area for heat dissipation and fundamentally improve the cooling capacity.
12. If the air-cooled engine is selected on the combine harvester, it is necessary to consider appropriately improving the ventilation capacity and reduce the poor heat dissipation.
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