There are many factors that can cause high hydraulic oil temperature. Excessive dirt outside the radiator can clog the air ducts, the oil lines can be blocked by dirt inside the hydraulic oil radiator, the main pump may experience severe wear, and the hydraulic oil tank may not be properly sealed. These are all factors that can cause high hydraulic oil temperature. In general, there are two main reasons for high hydraulic oil temperature in rotary drilling rigs: slow heat dissipation and rapid heat generation. Below, I will briefly discuss some of the reasons for high hydraulic oil temperature.
I. Slow Heat Dissipation#pile driver construction#
1. Insufficient radiator fan power, resulting in inadequate heat dissipation and high oil temperature.
2. Hydraulic oil not passing through the hydraulic oil radiator, resulting in high oil temperature.
3. Blockage inside the hydraulic oil radiator, resulting in high oil temperature.
4. Excessive dust on the outside of the radiator, resulting in inadequate heat dissipation and high oil temperature.
5. High ambient temperature, such as prolonged operation under direct sunlight, leading to high oil temperature.
II. Rapid Heat Generation 1. Clogged inlet filter causing excessively high oil temperature.
2. High hydraulic oil viscosity causing excessively high oil temperature.
3. Poor sealing of the hydraulic oil tank causing excessively high oil temperature.
4. Blockage in the hydraulic system pipeline causing excessively high oil temperature.
5. Severe wear and internal leakage in the hydraulic pump causing excessively high oil temperature.
6. Poor sealing and leakage in the hydraulic pump inlet pipeline causing excessively high oil temperature.
So, how do we solve the problem of excessively high oil temperature in rotary drilling rigs? Besides addressing the causes analyzed above, I'll share a few methods:
Method 1:
1. Check if the hydraulic oil radiator is clogged with dirt, leading to reduced heat dissipation efficiency. Clean the radiator if necessary.
2. Under extreme conditions, test the fan speed and actual system operating pressure to determine if there are any faults in the hydraulic components of that circuit, or if the oil temperature sensor or control circuit is functioning correctly. At this time, both the fan speed and system operating pressure should be at their maximum values; otherwise, adjust the corresponding system parameters or replace damaged components. Method Two:
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(1) Low radiator cooling efficiency. Replacing the tube-fin radiator with a plate-fin radiator increases the heat dissipation area by 8 cm², and the temperature difference between the radiator inlet and outlet increases from 7°C to 10°C, a significant improvement.
(2) Malfunction of the check valve on the hot return oil circuit. The current system's return oil back pressure is 0.3 MPa, and the oil cooler protection pressure is 0.2 MPa. Ideally, the return oil back pressure should be as low as possible while still meeting the system's back pressure requirements. The engine's oil temperature is too high, possibly due to: radiator resistance exceeding the protection pressure, causing hot oil in the return oil circuit to bypass the radiator and return directly to the oil tank; poor system cleanliness, with the check valve stuck by dirt, the valve core in the normally open position, rendering the radiator ineffective; and the check valve's opening pressure not being guaranteed. Under the premise of meeting system back pressure, the 0.30MPa check valve can be replaced with a 0.15MPa check valve, and the oil cooler's protection pressure increased to 0.35MPa.
(3) The engine's air duct arrangement is unreasonable. The existing air duct's unreasonable aspects are:
① Insufficient radiator airflow. Long slots can be added to the side doors to increase airflow.
② Gaps exist around the radiator and engine, lacking effective sealing, and the counterweight's concave front creates vortices in the hot air, resulting in poor heat dissipation. Sponge can be pasted between the radiator and engine for sealing, and the counterweight's concave front can be changed to a flat surface.
③ The main pump of the hydraulic system lacks a heat shield, causing hot air from the engine to blow directly onto the rear wall of the hydraulic oil tank, resulting in increased oil temperature. This can be improved by adding a heat shield.
(4) The radiator fins of the hydraulic system are bent or the oil passages are blocked, resulting in increased air resistance and poor heat dissipation. Bent fins should be adjusted promptly, and blockages in the air passages should be cleared. Regular flushing with pressurized water is necessary to ensure unobstructed airflow.
(5) Inappropriate hydraulic oil grade or poor oil quality. Hydraulic oil with too low viscosity will increase internal leakage, reduce efficiency, and generate heat; hydraulic oil with too high viscosity will increase fluid pressure loss, generating a large amount of heat and causing excessively high oil temperature. At the same time, poor oil quality is prone to emulsification, which can exacerbate damage to hydraulic components.
Method 3:
1. The main pump is severely worn; replace the rocker arm assembly, pump chamber, plunger, etc.
2. Replace the distributor valve with a repair kit and check for leaks. Replace the travel distributor with a repair kit.
3. Wrap the hydraulic oil tank with a heat-insulating pad.
4. Check the hydraulic circuit back pressure valve.
5. Adjusting the engine speed will also lower the temperature.
6. Reduce the size of the engine pulley on a lathe to increase the air intake. Cut off the base plate on one side of the radiator and replace it with a mesh plate.
After reading the above information, you should have learned how to control the hydraulic oil temperature of a rotary drilling rig. That's all for today. If you have any further questions, please visit the website of Shandong Yahe Engineering Machinery Equipment Co., Ltd. for more information.#pile driver construction#
