With the beginning of winter, the weather is getting colder and the cold winter is coming. It is more important to maintain and repair the rotary drilling rig. The editor of SDLQ rotary drilling rig summarizes the 10 major misunderstandings and precautions to keep the rotary drilling rig healthy in winter.
1. Draining the cooling water too early or not at all#hydraulic pile driver for excavators#
If the cooling water is drained too early, the engine body, while still at a high temperature, will be suddenly hit by cold air, causing sudden contraction and cracking. The engine should be operated at idle speed before shutting down. Wait until the cooling water temperature drops below 60°C and is no longer hot to the touch before draining the water. When draining the water, be sure to completely drain any remaining water from the engine body to prevent it from freezing and expanding, potentially causing cracks.
2. Using inferior fuel
The low temperatures of winter reduce the fluidity of diesel fuel, increasing its viscosity and making it difficult to spray. This leads to poor atomization and combustion, resulting in reduced power and fuel economy. Therefore, light diesel fuel with a low freezing point and good ignition performance should be used in winter. Generally, the freezing point of a diesel engine should be 7-10°C below the lowest local temperature for the season.
3. Starting a rotary drilling rig with an open flame
Do not remove the air filter. Use cotton wool dipped in diesel fuel, light it, and place it in the intake pipe to start the rotary drilling rig with an open flame. During the starting process, dust-laden air from the outside world will be drawn directly into the cylinders without being filtered, causing abnormal wear on parts like the piston and cylinder. It can also cause the diesel engine to operate roughly, potentially damaging the machine.
4. Open Flame Oil Pan#hydraulic pile driver for excavators#
Open flame oil pan heating can cause the oil in the oil pan to deteriorate or even burn, reducing or completely losing its lubricating properties, and thus increasing machine wear. In winter, use oil with a low freezing point. During starting, use an external water bath to raise the oil temperature.
5. Improper Starting Methods
Before starting a rotary drilling rig, it must be fully preheated. Before the engine is preheated, the gaps between components are larger, allowing the oil to easily settle. After starting, a period of preheating is necessary, and the oil pump begins operating to deliver oil to the parts requiring lubrication. The oil can only circulate to key components after the engine is started. If the engine is revved and cranked quickly during this period, the rapid temperature increase will increase wear on the components. Similarly, rapid operation when the hydraulic oil temperature is low can damage the hydraulic system. Note: The optimal warm-up time in winter is generally 15-20 minutes.
6. Low-temperature load operation
After a diesel engine starts and ignites, some drivers are impatient to immediately put it into load operation. However, due to the low engine temperature and high oil viscosity, the oil cannot easily penetrate the friction surfaces of the moving parts, causing severe wear. Furthermore, plunger springs, valve springs, and injector springs are susceptible to breakage due to their "cold brittleness." Therefore, after starting and igniting in winter, diesel engines should be idled at low to medium speed for a few minutes, and then put into load operation only after the cooling water temperature reaches 60°C.
7. Failure to maintain engine insulation
Low winter temperatures can easily cause diesel engines to overcool during operation. Therefore, insulation is crucial for optimal winter operation. In northern regions, diesel engines used in winter should be equipped with insulation covers and curtains to protect against the cold. Furthermore, the thermostat plays a crucial role in the engine's temperature rise during operation. Therefore, it should be checked promptly for proper operation and any faulty thermostats should be replaced promptly. 8. Turn off the engine immediately upon shutdown. The correct method is to run the engine at idle speed for 5-10 minutes, especially for turbocharged diesel engines, because the turbine speed is very high at this time, reaching more than 100,000 revolutions per minute. Turn off the engine immediately and the oil pump will stop working. However, the turbine is still running at high speed due to inertia and the temperature is still very high. The turbine shaft lacks oil lubrication and cooling. Frequent operation will cause premature damage to the turbine shaft. Therefore, the engine should be run at idle speed for a while and then turn off the engine after the temperature drops. 9. Failure to grease the rotary drilling rig on time. Failure to grease the rotary drilling rig on time will have serious consequences: (1) Increased wear. Failure to grease the rotary drilling rig on time will cause the grease seal to fail to seal and even cause it to break, increasing the wear between friction parts (such as sleeves, pins, etc.) and reducing service life. The machine works as a whole, so this will also increase the wear of other parts. (2) Affecting operational accuracy. Affecting operational accuracy will reduce work efficiency. For example, the gap between the buckets of the rotary drilling rig will increase, making it difficult to perform precise leveling and "sweeping" operations. Work that can be completed in one go will require several attempts. (3) Wear and breakage of components If the grease of the rotary drilling rig's travel device is not adjusted in time, it is easy for the crawler to disengage, or other components to be severely worn and break. 10. The rotary drilling rig is parked randomly. The rotary drilling rig is parked randomly, regardless of whether the terrain is flat or not. If the parking location is steep, it will lead to insufficient oil pressure in the rotary drilling rig, which will cause the engine to overheat in the long run.#hydraulic pile driver for excavators#
