Hydraulic system oil pump of thickener working principle operation manual

Hydraulic system also called hydraulic pressure, is now most popular in China thickeners, such as : central transmission thickener clarifier, paste deep cone thickener, peripheral transmission thickener.

1. Parameter:

Rated working pressure: 6.3 MPa Oil pump displacement: 25 L/min

Hydraulic oil: winter N32, summer N46. Oil working temperature: -10 ℃~65 ℃

Effective capacity of fuel tank: 0.3m ³

2.Working principle

After starting the motor, the oil pump starts to work, driving the hydraulic motor reducer, causing the main shaft of the transmission device to drive the rake frame to run, and the hoist begins to operate. When the amount of material settling at the bottom of the concentration tank increases and cannot be discharged in a timely manner, the resistance of the scraper to scraping mud increases, and the operating pressure rises. When the pressure reaches 4Mpa, the pressure relay, solenoid valve, and delay relay act to cut off the oil supply to the hydraulic motor, and the hydraulic motor stops running, that is, the scraper stops rotating. The lifting cylinder lifts the scraper, delaying for 5-6 seconds. At this time, the solenoid valve acts to restore oil supply to the hydraulic motor, and the scraper runs at this height. As the working resistance decreases, the scraper gradually descends to its normal working position by its own weight. When the work pressure increases to the allowable value again, the rake frame will lift again and repeat the above actions to achieve the automatic lifting and lowering of the rake. When the working resistance of the rake continues to increase and the rake rises close to the limit position, the travel switch will act, cutting off the power and stopping the operation of the hoist. At this time, the fault should be eliminated before manually starting the machine. The oil pump is a variable displacement pump, and the flow rate of the oil pump can be adjusted to regulate the speed of the rake frame. Generally, it is controlled at 5-15 minutes per revolution.

3. Debugging steps of hydraulic system (Note: The first debugging should be carried out under the guidance of technical personnel dispatched by the thickener manufacturer.)

(1) Open the organic glass cover plate of the rake oil cylinder support, remove the travel switch, but do not remove the power cord.

(2) Block the oil inlet of the hydraulic motor by placing a dime in the rubber hose joint at the inlet and tightening the joint.

(3) Close the throttle valve on the rake oil cylinder.

(4) Turn on the oil pump, turn the oil pump knob, and set the pointer to the "5" mark.

(5) Rotate the overflow valve knob to open it and put it in the overflow state.

(6) Rotate the pressure gauge switch knob to connect the pressure gauge oil circuit.

(7) Start the motor and rotate the oil pump clockwise for 2-3 minutes.

(8) Slowly adjust the relief valve, and the oil pressure gradually increases. When the pressure indicated on the pressure gauge is 5.5 MPa, stop adjusting the relief valve.

(9) Adjust the pressure relay so that the solenoid valve operates when its working pressure is at 5.5Mpa.

(10) Adjust the delay time of the delay relay to about 6 seconds.

(11) Press the rake button, and the rake frame will start to lift, raising it to the highest position. At this point, continue to hold down the rake lifting button to increase the oil pressure. Observe the pressure gauge and lock the rake lifting relief valve when the pressure reaches 10Mpa. When the solenoid valve is powered off, adjust the rotor overflow valve to 6.3Mpa, and lock the rotor overflow valve.

(12) Slowly open the throttle valve, and the pressure gradually decreases. When the pressure drops to less than 5.5Mpa, the rake frame gradually decreases by its own weight until it reaches the lowest position. During this period, it can be repeatedly debugged to control the time for the rake frame to descend from the beginning to the lowest position within about 1 hour.

(13) Install the travel switch in its original position, and then adjust the lifting rake. When the rake frame is lifted to the highest position, the collision block touches the travel switch, cuts off the power, and the motor stops running. If restarted, it can be manually turned on. The debugging of manually lifting and lowering the rake mentioned above has been completed.

(14) After the manual rake adjustment is completed, the concentrator is in automatic rake lifting mode. When the concentrator is running normally, the automatic rake lifting process is as follows:

When the scraping resistance of the rake frame is greater than 5.5 Mpa, the pressure relay and solenoid valve will act to cut off the oil supply to the hydraulic motor, and the rake frame will stop running and start to automatically lift the rake. After about 5-6 seconds, the solenoid valve will act again to restore the oil supply to the hydraulic motor, and the rake frame will start to rotate again. If the scraping resistance decreases below 5.5 Mpa at this time, the rake frame will rotate at this height. If the scraping resistance further decreases, the rake frame will slowly descend to the lowest position by its own weight. If the scraping resistance does not decrease after lifting the rake once and is still greater than 5.5Mpa, then lift and lower the rake again according to the above actions. If the scraping resistance is still greater than 5.5Mpa after the second rake lifting, the third rake lifting will trigger the travel switch and the main engine will stop running. At this point, the fault should be identified, promptly resolved, and then manually turned on.

(15) When debugging the rake frame rotation, first shut down the motor, and the oil pressure will rapidly decrease until there is no pressure.

(16) Remove the coin from the hydraulic motor inlet and connect the connector.

(17) Start the motor, the oil pump works, and the rake frame begins to rotate. Note that the rake frame should rotate counterclockwise, and the time for each rotation should be set at 5-15 minutes.

(18) The aerial operation debugging is basically completed, and the air operation time is not less than 2 hours. The debugging methods for the water test and load test are the same as those for the air operation debugging, and the load test time is not less than 24 hours.

The concentrator can only be officially put into operation after the trial run is normal.

4. Maintenance and upkeep of hydraulic system

Regularly maintain the cleanliness of the hydraulic station, observe changes in working pressure at all times, regularly check for leaks in the oil circuit, identify faults, and promptly eliminate them. When replacing hydraulic oil, it is necessary to clean the oil tank and filter screen.