| 摘要 |
<p>Speed measuring device winding tube (6) is placed on the land a few meters from the coil strip irrigated dummy . The tube ( 6 ) is part of the drum , and when water rates leads to its rolling up on a reel . Measuring system for winding the hose is connected via the base frame ( 1 ) . On a base frame ( 1 ) there are two rollers ( 2 , 4 ) , of which the roller ( 4 ) is the pressing and the roller ( 2 ) is connected to the sensor ( 3 ) turns. Contact force rollers ( 2 , 4 ) of the tube ( 6 ) provides tension spring (5 ) . Travel of the belt there is a rotation of the rollers ( 2 , 4 ) and thereby to rotate the sensor ( 3 ) turns. To measure engine speed used may be any incremental encoder ( 3 ) the speed with power supply 5V . The measuring device itself , it is necessary prior to measurement to ensure that there is no slippage between the rollers ( 2 , 4 ) . Sensor ( 3 ) is connected to the speed the evaluation and display unit ( 7 ) . In operation, the measuring device is wound tube ( 6 ) inserted between the rollers ( 2 , 4 ) , so that the rollers ( 2 , 4 ) rotate without slipping . A metered device features a simple involving the evaluation and display unit ( 7 ) to the PC ( 8 ) by means of a USB connection , in order to adjust the input parameters , respectively . save the measured data to PC (8) memory. The measuring device allows measurement of the speed in the range of 0 to 40 mh -1. At the beginning of the measurement , it is necessary to set the input parameters ( diameter of the cylinder and the number of tachometer pulses ) of the measuring device .</p> |
