Injection pump test bench fuel injection measuring device which

Fuel injection pump test bench is a diesel engine fuel injection pump testing, adjustment and maintenance of specialized equipment. The fuel pump test bed often have some data we need to go to the attention, fuel injection pump test bed which is one of the important. How to test the fuel injection pump test bench? Fuel injection pump test bench fuel injection measuring devices include: counting device, fuel collector and control device. 1. The counting device The function of the counting device is to set and control the number of fuel injection test. Counter models of various types of test counter used in different forms, the older forms of test-bed mostly mechanical metering automatic oil metering device, such as domestic RS-Q280-type fuel pump test bench, the number of automatic injection control mechanism is Worm gear, worm, ratchet and other lever mechanism. Rotation of the worm shaft and the spindle 100 rpm (fuel injection pump 100 times) only one rotation of the worm shaft, the worm wheel rotation after the action, through the middle of the transmission mechanism and the lever reached the amount of oil cutting device, will flow Cylinder oil flow cut off. That is measured fuel injection pump 100 times the amount of oil. Therefore, the test bench has a count base of 100 times and can measure 100 times of multiples up to 1,000 times. In the new test stand, mostly used photoelectric counter, which consists of signal generator and counter. The signal generator consists of a perforated disk mounted on the spindle and a light-sensitive element. Each revolution of the disc, shielding the photosensitive element once, send a pulse signal. The working process is as follows: When the hole turns to the light source, the light shines through the hole on the photodiode, and the photodiode is in a low resistance so that the BG is in the on state and the collector is in the high potential. When the hole turns, the light is blocked, the photodiode was high resistance, cut-off, the collector output negative transition, the capacitor and the resistor added to the base, so that the sum of the composition of the emitter bistability flip, collector It outputs a negative rectangular pulse input counting circuit to count. The counter is generally a decimal count circuit, each counter can accept 9 pulses, when the 10th pulse arrives, counted by the second counter, and the next counter analogy. Nine 999 pulses can be accepted in series by four counters. The count pulses counted by the counter are translated by the decoder and sent to the compare link consisting of the selector switch and the AND gate. Select the switch can be set to the desired number of experimental fuel injection position. When the input pulse reaches the value set by the selector switch, each counter circuit outputs a signal and the AND circuit is opened, so that the control relay of the fuel amount measuring function cuts off the oil passage. The counter normally counts from 0 to 1000. 2. The fuel collector The role of the fuel collector is to be tested in the fuel injection pump in each sub-pump accurate collection of fuel to the graduated measuring tools to determine the pump fuel pump components of the oil supply. Fuel injection pump test bench in the measurement of fuel supply, the fuel injector is not injected directly into the cylinder, but the first fuel injection oil-filled collector, relying on the transfer of liquid displacement, the oil through the small diameter hose Into a graduated cylinder, so you can eliminate the foam in the measuring surface of the oil, easy to observe. In some test stands are also equipped with a mist eliminator, the fuel injector spray mist eliminator, mist eliminator equipped with a barrier to eliminate fuel splashes and to help fuel cohesion. Then by the collector in the liquid displacement transfer, the small diameter hose will be introduced into the measuring cylinder. This method not only eliminates the foam, but also reduces the loss of evaporation of light components of the fuel due to atomization and improves the measurement accuracy. In order to adapt to the measurement of different injection times, two pump cylinders of different sizes are generally arranged on the test bench corresponding to each pump oil element, and they can be replaced by handle manipulation. 3. Control device The role of the control device is to control the fuel injection start and end of the collection time. Do not allow fuel spray from the injector to flow to the cylinder until the counter starts counting. Therefore, there must be a shut-off device to separate and inject the fuel injected by the injectors into the fuel tank. Most test stands have a solenoid-operated oil deflector above the dipstick opening. When the counter starts to count, the electromagnetic relay turns on and pulls the deflector, causing it to automatically move away, causing the oil flow in the fuel collector to flow Fuel tank, began to collect the fuel jet. When the counter reaches the preset number of injections, the relay electromagnets are released, returning the oil deflector to the blocking position, blocking oil flow from the oil collector and preventing it from flowing into the oil canister.

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