Shandong Jingke Intelligent Transmission Equipment

1. In response to the blockage problem caused by dust and grass debris covering the ventilation duct between the cooling water tank radiator chips, the following measures should be taken:
(1) Change the position of the cooling air inlet. At present, the cooling air for small and medium-sized wheeled tractor engines is sucked into the radiator of the water tank by the cooling fan from the front of the tractor. During harvesting operations, debris such as dust and grass debris raised during cutting and conveying at the front of the header can easily be sucked onto the radiator chip through the front hood of the locomotive. In order to change this situation, it is necessary to try to change the inlet position of the cooling air so that the air inlet is higher than the front cover of the tractor, so that dust and grass debris from the header are not easy to enter the radiator of the water tank, delaying the increase in water temperature.
(2) Install a dust deflector at the air inlet (about 10 centimeters in front), with an area larger than the front end of the tractor cover, and the surrounding area should be slightly bent back. In this way, the majority of the dust and grass debris raised at the front of the header are blocked by the dust deflector or directed towards the periphery of the air inlet. At the same time, it is necessary to replace the original windshield mesh with around 40 mesh iron wire mesh, and block any areas where air may enter with iron wire mesh. This will greatly reduce the amount of dust and grass debris inhaled, and can also delay the rise of water temperature.
(3) At the same time as installing a dust cover, a secondary water tank is added to increase the capacity of the cooling water, thereby delaying the heating rate of the cooling water.
(4) Change the placement of the cooling water tank. Remove the original cooling water tank and design a bracket to place the water tank and fan on top of the same vertical plane higher than the original water tank, with a height that does not block the operator's line of sight. Connect the engine and water tank in the original circulation mode and connect the fan with an appropriately long triangular belt. This method can improve the working conditions of the cooling water tank. Not only is dust and grass particles not easy to stick to the radiator of the water tank, but the ventilation conditions are also greatly improved. This method also has good cooling effect.
(5) If there is no other way, the front cover of the tractor can be temporarily removed to expose the engine and cooling system directly to the air. This also has a certain heat dissipation effect, but it looks very unsightly and should not be used in general.
2. Overload operation is strictly prohibited, and the load during high temperature seasons should be controlled at around 90% to prevent excessive water temperature.
3. The engine should be filled with clean soft water, and the water tank should be regularly checked for water shortage or leakage during operation.
4. According to the requirements of the user manual, check and adjust the tension of the fan belt to ensure the expected speed of the fan and provide sufficient air volume to cool the water tank or body.
5. For engines that have been in use for a long time, the cooling system should be thoroughly cleaned to remove scale. When cleaning, first remove the thermostat, and then prepare cleaning solution in the ratio of 20 kilograms of water, 1.5 kilograms of caustic soda, and 0.5 kilograms of kerosene. After injecting it into the water tank, start the engine and run it at a fast to slow speed for 5-10 minutes. Wait until the water temperature rises to 70-80 ℃ and turn off the engine. Let it sit for 10-12 hours before starting the engine and running it at medium speed for 5-10 minutes. Then turn off the engine. Drain the cleaning solution while it is hot, add clean water, and run it at medium speed for 4-5 minutes to release it, Flush the cooling system, clean it two or three times, then reinstall the thermostat and add enough cooling water.
6. Check the working performance of the thermostat and remove it if necessary (in hot weather) to prevent the thermostat from malfunctioning and affecting the normal circulation of cooling water, thereby reducing cooling function.
7. For water pumps with long working hours, the impeller and inner hole of the pump casing, the friction between the pump shaft and bearings, and the water seal components should be inspected. If the friction is severe, it will cause insufficient drainage and affect the circulation of cooling water. At this time, it needs to be repaired in a timely manner.
8. For engines that have been in use for a long time, the sealing of the valves should be tested and the valve clearance should be correctly checked and adjusted. Poor valve sealing can cause high-temperature and high-pressure gas leakage, leading to an increase in engine temperature. The main reasons for poor sealing are generally poor contact between the valve seat and the valve, and weak spring force. If the valve is not tightly closed, it should be repaired in a timely manner.
9. Adjust the fuel supply advance angle accurately to ensure fuel supply timing. Long term use of fuel injection pumps can result in severe wear and tear on the camshaft, rollers, and follower columns, resulting in delayed fuel supply and delayed diesel injection into the cylinder, which may prevent timely and complete combustion, or cause afterburning, causing the engine to overheat. Therefore, it is necessary to check and adjust the fuel supply advance angle in a timely manner.
10. Check and adjust the fuel injector to ensure that the injection pressure, atomization and spray cone angle meet the specified requirements. If the atomization and spray cone angle of the fuel injector are not good, the fuel and air will not mix well, resulting in a decrease in combustion speed, an extension of combustion time, and an increase in engine temperature.
11. Start with design. Because the combine harvester operates for a long time, the ambient temperature is high, the ventilation is not smooth, and the walking speed is slow, working in such bad conditions, the working capacity of the engine cooling system is particularly important. When designing, the cooling capacity should be determined based on the requirements of the engine in high-temperature environments and full load conditions. In order to increase the cooling capacity, it is recommended to consider the following two issues: on the one hand, it is necessary to improve the volumetric efficiency of the fan, increase the transmission capacity of the fan drive belt, reduce its slip rate, select the optimal ventilation position, reduce the circulation resistance of the cooling air, and increase the intake air volume; On the other hand, it is necessary to improve the fan blade structure and design streamline fan cover to increase the heat dissipation area and fundamentally improve the cooling capacity.
12. If the combine harvester is equipped with air-cooled engine, it is necessary to properly improve its ventilation capacity to reduce poor heat dissipation.