SU706829A1 - Loose material level regulator - Google Patents

Description

(54) LEVEL LEVEL REGULATOR

The device relates to automation and is intended for pulse-width regular adjustment of the level of various granular and viscous media in containers. An izyest controller 1, is a level of bulk media containing two sensors made in the form of a two-phase electric motor, one stator winding of which is connected to the power source directly and the other through a capacitor. The well-known level 1 controller is unreliable in operation due to large the number of contacts of microswitches. and other elements included in its design, characterized by a limited number of operations. When monitoring the level of viscous media, the sensor of the lower level can produce false signals due to material sticking to its brake impeller. The closest to the invention to the technical essence is a level 2 bulk flow controller that contains a level sensor bulk media, including an asynchronous two-phase electric motor, one of the stator coil, which is connected to the power supply directly, and the other through a series-connected capacitor and the first. an auxiliary winding of an isolation transformer, the output of which is connected to the input of the first switch connected to one of the power supply terminals, the other terminal of which is connected to one end of the winding using ADDITIONAL relay. However, the known device provides on-off regulation of the LEVEL of flowing media with an insignificant deadband, which leads to frequent actuation of the executive relay and decrease in reliability of operation. The purpose of the invention is to improve the reliability of the controller, the level of bulk media. ..To achieve this goal, a level controller of bulk solids contains a level sensor of bulk solids, including an asynchronous two-phase electric motor, one of the stator windings of which is connected to the power supply directly and the other through a series-connected capacitor and primary winding of the isolation transformer.

the output of which is connected to the input of the first switch connected to one of the power supply terminals, the other terminal of which is connected to one winding terminal of the executing Hiro relay, the series-connected delay element, the threshold element and the second switch are inserted. The second switch is made in the form of a diode bridge, one of the diagonals of which is shunted by the closing contact of the executive relay and connected by vertices to the other end of the winding of the last and the output of the first switch connected to the input of the delay element.

The drawing shows a flow level regulator for solids,

The bulk solids level regulator contains a bulk solids level sensor 1 that includes an asynchronous two-phase electric motor 2, ODD. . from the stator windings 3 of which is connected to the power supply 4, immediately, and the other 5 - through the post-connected capacitor b and the primary winding - separating transformer 7, the output of the transformer 7 is connected to the iHBD5 of the fourth switch 8 connected to ..; one of the terminals. source a. 4 power supplies whose other terminal is connected to one winding terminal. the executive relay 9, In addition, the controller contains a series-connected element BEFORE the delay, the threshold element Neither the second switch 12, made in the form of a diode bridge, has a diagonal of which is shunted by the closing contact 13. executive relay 9. - -

The level regulator is operating in the following manner.

When. Level; the controlled medium drops below the crank -: two-phase electric motor 2, it begins to rotate. In the winding of the specified electric motor, connected in series with the primary winding of the isolation transformer 7 and connected. voltage increases dramatically. . :.

This causes the voltage to be increased with the wiring of the secondary winding E; separator T..BfH of the reformer 7 and, therefore, at the input of the switch — which opens. Through the switch 8, one of the diodes of the switch 12 and the winding of the executive relay 9 passes a half-wave rectified current charging the capacitor of the delay element 10. When, at an interval of time determined by the constant distance of the delay element 10, the voltage is unlocked by the threshold element 11 and

power, the input voltage of the delay element 10 reaches its response threshold. ,

This opens switch 12 and actuates the actuating relay 9,

With the closing contact 13, the executive relay 9 is self-blocked, the switch 12 is shunted. With its closing contact (not shown), the executive relay 9 switches on the mechanisms that fill the container with loose material. The executive relay 9 is held in the on state as long as the two-phase asynchronous motor 2 rotates. When the impeller of the specified motor 2 is braked by the product, the switch 8 is closed and used. The relay 9 is turned off.

The capacitor of the delay element 10 begins to charge only after the material level in the tank rises below the asynchronous two-phase electric motor -2. Subsequently, the operation of the regulator is repeated. The duration of the disconnected Tub and the executive relay 9 can be regulated by a variable resistor. ...

When using this regulator of the level of bulk media, the number of actuations of the executive relay 9 and the transport mechanisms sharply decreases. The regulator circuit is characterized by simplicity and high reliability in operation. The presence of only one electromotive sensor of level 1 of flowing media creates conditions for regulating not only the damage of bulk materials, but also difficult flowing ones. and wet environments. All this provides the regulator with widespread use in the national economy.

Claims (2)

1.Agaykin D.I. et al. Sensor control and regulation, m., Mashinostroenie, 1965, p.446, Fig.3.127. 2. Author's certificate of the USSR I 510697, cl. G 05 D 9/12, 1973 (prototype).