Fault Analysis and Solving Measures of Dust Collecting Sprinkler Power Take-off Device
First, sprinkler structure and working principle
1. basic structure
Sprinklers generally consist of car chassis, water tanks, water pumps, power take-off devices, water spray devices, suction devices, waterway systems, and control devices. The water pump is the power element of the waterway system. The power takeoff is driven by the auxiliary drive shaft to rotate; the power takeoff is installed in the power take-off port of the transmission, and the power take-off is taken directly by the four-speed drive gear of the transmission intermediate shaft; the water outlet of the water tank passes through the valve. Connected to the inlet of the pump, the outlet of the pump is connected to the front nozzle, rear nozzle, side nozzle or high pressure water gun through different valves; respectively, each valve of the front nozzle, rear nozzle and side nozzle is controlled by the driver in the cab through the electric switch The high pressure water gun valve is controlled by a manual outdoor valve. The water system diagram is shown in Figure 1.
Figure 1 Sprinkler system
2. working principle
(1) Water tank water
1 Fire hydrant water supply
The ball valve 7 is opened and all other ball valves are closed. A fire hydrant is connected at the fire hydrant 9 and the other end of the hose is connected with a fire hydrant with a water source on the ground, and then the fire hydrant switch on the ground is opened. Through the manhole to observe the water level in the tank, fill the water tank with water.
2 pump self-priming
Confirm that the ball valve in the outlet ball valve 2, 10 and the high-barrel-gun line is closed, the water-inflow three-way ball valve 4b is closed, and the c-side male flange connector is connected to the female end of the hose flange, and the other end of the suction pipe (water filtration Put in water. Note that the water filter should not fall into the bottom of the water source to avoid inhalation of impurities.
Close the fire hydrant and open the ball valve 7. Start the engine, put the power take-off gear, drive the pump to run. At this point the water will be pumped into the tubing and into the tank. Through the manhole to observe the water level in the tank, fill the water tank with water.
(2) Front spray
Open the ball valve 10 (pneumatic) and 11, 12 (manual), usually 11 and 12 normally open, only need to flush, according to the left and right choose to close 11 or 12, three-way ball valve 4 (pneumatic) c close, other ball valve Are closed. The water flows from the tank through the three-way ball valve 4 (manually) into the pump, and then enters the pipeline from the outlet and can perform the front spraying operation.
(3) After watering
Open the ball valve 2 (pneumatic), the three-way ball valve 4 (manually) c to close, other ball valves are closed, you can implement post-sprinkling operations.
(4) High altitude jet
The three-way ball valve 4 (manually) c closes, opens the ball valve on the high artillery gun pipeline, and all other ball valves are closed, and high-level injection can be performed.
Second, the factors that may cause the power take off
1. Power take-off quality
Each of the four sprinkling vehicles uses a brand power take-off device supplied by the material department. The brand power take-off device is not damaged on the three Dongfeng sprinklers for more than one year, but it often fails on the Liberation Sprinkler. After consulting the relevant power take-off reference, the design parameters of the power take-off of the brand: shaft power 30 kW, input torque 170 N.m.
2. Driver operating factors
After on-site observation and examination of the driver's operating conditions, the driver is familiar with the operating procedures and operating specifications. When the sprinkler arrives at the sprinkler site, stop first, press the clutch, press the front spray (or post-spray) water cut-off door button as required, open the front spray (or post-spray) water cutoff, and mix the power take-off wrench (manual type) Or press the power take-off button (pneumatic type), combine the power take-off device, hang the transmission second gear, and slowly lift the clutch to start watering. From the analysis of the driver's operation process, there are no unreasonable operation factors, and four sprinklers are used in the day and night shifts of the car team and the driver is not fixed, and only the liberation sprinkler power take-off is often damaged.
3. Water truck related technical parameters
When three kinds of sprinklers were sprinkled on site, the spraying range of the Dongfeng SZQ9170GSS sprinkler was the most recent, followed by the Dongfeng BSZ5130GSS sprinkler, and the liberation of the BSZ5113GSS sprinkler was the longest. Dongfeng BSZ5130GSS sprinkler compared with Dongfeng SZQ9170GSS sprinkler, its engine model is the same, but the pump shaft power is different, the water pump shaft power of the Dongfeng BSZ5130GSS sprinkler spray range far; Jiefang BSZ5113GSS sprinkler and Dongfeng BSZ5130GSS sprinkler compared, the pump shaft power Although the same, but the CA6110/125Z1A2 engine rated power and rated torque are higher than the EQ6100-1 engine, so the liberation of the BSZ5113 sprinkler spray range farthest.
Third, power take-off failure analysis
In order to find out the specific reasons why power take-offs often fail, we compared and analyzed the power take-offs of three different types of sprinklers from the following aspects:
1. Power take-off power
Transmission shaft and intermediate shaft of a pair of constant meshing gears, the transmission ratio i1 = 1.9545; transmission intermediate gear four gear drive gear and power take-off passive gears form a pair of constant meshing gear, the transmission ratio i2 = 0.6; power The dual drive gear and the power take-off output driven gear of the power take-off gear are meshed through the aerodynamic, and the transmission ratio i3=0.9583; therefore, from the engine flywheel to the power takeoff output shaft, the total transmission of the clutch does not slip and lose. ratio
i= i1* i2* i3=1.124
Take the engine average speed of 2100 rev / min, then the actual input speed of the water pump input shaft N2 = 2100/1.124 = 1868 rev / min, the theoretical input power of the pump input shaft P1 = 22.5kW, the theoretical speed N1 = 1480 rev / min
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