In modern urban sanitation work, ISUZU vacuum sewage suction trucks have become an indispensable cleaning tool with their excellent performance and efficient cleaning ability. This article will describe the working principle of ISUZU vacuum sewage suction trucks in detail, and focus on its self-priming and self-draining functions and its efficiency in handling various liquids and solid wastes.
The working principle of ISUZU vacuum sewage suction trucks is based on the vacuum negative pressure principle. When the suction hose of the sewage suction truck is always immersed in the liquid surface, the eccentric rotor of the sewage suction pump begins to rotate. Under the action of centrifugal force, the rotor slides close to the inner wall of the pump body, causing the volume of the suction studio to gradually increase, thereby extracting the air in the tank. As the air in the tank is continuously sucked, its pressure gradually drops below atmospheric pressure, forming a vacuum state. At this time, the fecal liquid is sucked into the tank through the fecal suction hose under the action of atmospheric pressure. At the same time, when the siphon approaches the bottom of the tank, the air is continuously discharged into the fecal tank, and is compressed because there is no way out, causing the pressure in the tank to be higher than the atmospheric pressure, and the fecal liquid is discharged out of the tank through the siphon and the fecal suction hose under the action of compressed air. This suction and discharge process is repeated to achieve rapid collection and transportation of waste.
The self-priming and self-draining function of the Isuzu vacuum suction truck is one of its notable features. The suction pump has a strong suction force and can easily suck various liquids and solid wastes into the tank. At the same time, the suction tank can be hydraulically unloaded and the rear cover can also be hydraulically opened, so that the waste can be easily discharged. This self-priming and self-draining design not only improves work efficiency, but also reduces the tediousness and danger of manual operation.
Procedure
★ Suction operation preparation
A, Keep the sewage tank rear door closed
B, Carefully check whether the lubrication of vacuum pump gas-oil separator working normally.
C, Press the clutch pedal and pull out PTO button to make PTO, Vacuum Pump and Gear Pump Working.
★ Operations sequence (Detail figure)
A, Press the clutch pedal, adjust the PTO button, to get power from the truck engine and start the vacuum pump, then slowly release the pedal.
B, Start the safety alarm (in the cab)
C, Adjust the hand throttle joystick to largest position, and keep the revolution meter point to 500-600r/min (already has been set before out the factory)
D, adjust the four-way valve to suction position (Front to LEFT POSITION and Rear to RIGHT POSITION), carefully check the released air, the vacuum pump sound, the vacuum meter.
Please Note: Only suggest use vacuum pump for Pump-In working, strictly forbidden for Pump-Out working
E, Put the suction pipe into the sewage. Park the vehicle in right place before suction working, which can keep the pipe straight or free bending state, and guarantee vehicle work normally.
Each truck equipped with 1 unit 7m pipeline DN100, and 10 units 20m pipeline DN76
Firstly connect 7m pipeline with valve, and then connect 20m pipelines if need.
★ Attention while working
A, Things like over 50mm stone, cotton yarn, leaves etc. will block the suction pipe, and should not be suction, also should keep the pipe clean and unblocked.
B, Keep the suction valve full open while vacuum meter point to 65-80kpa, because half-open may damage the valve.
C, The suction pipe should be moved frequently while suction. Because suction some air and water will increase efficiency when the sewage is too viscosity.
★ Waste water discharge operating instruction.
After sludge and waste water separate, open scupper valve to discharge all the waste water and be ready for next suction. Pressure can bigger while discharging water. Operation approach as follows:
A, Adjust four-way valve joystick to nonworking position, then open the discharging valve to open position, and discharge all the waste water by gravity. (Recommend)
Nonworking Position Open Rear Discharging Valve
B, Adjust four-way valve joystick to discharge position, then the vacuum pump keep working, and the pressed air goes into tanker to put waste water quickly out of the tanker. (Not Recommend)
C, When discharge by pressure, firstly, open the discharge valve, then adjust discharge valve joystick to discharge position, in case of tanker pressure become too high, some accident and bad influence on rear door sealing.
★ Muddy discharge operating instruction
(1) Press the clutch; turn on the air operated valve or adjust PTO box joystick to make oil pump running.
(2) Rear door clamping device valve to discharge some waste water, and adjust the inside tank pressure to be equal to the outside pressure.
(3) Open the rear door clamping device, loosen the handgrip and completely take off screw.
(4) Adjust the rear door manual operated valve to open rear door, please be sure the inside and outside air pressure is equal before open the door. If the pressure is not equal, the door seal and oil cylinder may be damaged.
(5) Recovery operation after discharge the sludge: adjust manual operated valve joystick to DECLINE position, and carefully exam the follow things after the tanker reposition.
A, Carefully check the tank door flange and seal ring, and clean it if dirty.
B, Adjust manual operated valve joystick to CLOSE position, closes the rear door.
C, Operating the rear door clamping device until the rear door closed completely.
Operation Method:
LEFT Manual Joystick: Control the Tank Body Lifting Up / Falling Down
Push In------Tank Body Falling Down
Pull Out------Tank Body Lifting Up
RIGHT Manual Joystick: Control the Rear Cover Door Open / Close
Push In------Rear Door Close
Pull Out------Rear Door Open
