SU932266A1 - Continuous weigher-batcher - Google Patents

Description

This invention relates to weighing equipment, in particular, to devices for continuous weighing of bulk materials. A continuous weighing weigher is known, which contains a hopper with a vibrator and a material output regulator, a weighing device with a transducer, a setpoint adjuster and a regulator with actuating mechanism G11 of the feeder. However, in the dosing unit, the vibration drivers and the material output regulator are connected to the outputs of the regulator of the feeder and the setting device through additional transducers 1e converters with a control channel selection unit. This improves the accuracy of dosing, but due to the change in speed of the weighing conveyor, the latter is still not satisfactory. The closest in technical essence to the present invention is a continuous weighing weigher containing a feeder and a load-receiving mechanism with a drive, each made in the form of a motor with a converter of skrrosti connected to the first input of the corrective device, the output of which is connected to the executive mechanism controlling the engine, and connected to a load-receiving mechanism is a capacity calculation unit, the output of which is connected to one input of the regulator, to another input of which the output beyond Performance sensor 2. In the known metering unit with parallel control of the drives of the feeder and the load-carrying mechanism, the lack of reciprocal communication in speed between the feeder and the load-receiving mechanism leads to deterioration of the dynamic characteristics of the common control loop of the metering unit, since the variation of the movement speed of the drives of the load-receiving mechanism or feeder 393 deviations in the general control loop, which leads to the need to reduce the sensitivity of the general control loop and, Oh, to higher sho uneven material supply. The latter in turn leads to a decrease in the supply of material. The purpose of the invention is the improvement of metering accuracy. . The set goal is achieved by the fact that in the weighing dosing unit of the uninterrupted action, {- 8l two days of the ator. and the first sums No. {ru adke inputs of adders pokkpk & w to the output ryjiHTOp s „the second summation of the input liepBoro adder and subtraction input. The second adder is connected to the output of the drive converter's speed converter, and the second summing input of the Second adder and subtracts the input of the first mixer, connected to the output of the converter of the drive speed of the receiving mechanism, the output of the first adder is connected to the second inverter. and the output of the second adder is connected to the electrical input of the correction drive actuator device, the drawing shows a skeme, dose. The continuous dispenser contains a feeder 3 with a drive 2, which includes a speed converter 4, a correction device 5 and its resolution mechanism b, load carrying mechanism 7 with drive 8 comprising engine 9, converter 10 speed J correcting device (11 and actuator 2, performance calculation block 13, contains multiplier 4 to the inputs under oedineny preobrazovyteli 15 GB force and speed setting gruzopriemnoz mechanism 7, the performance calculating unit Cpd nen to the first input of the regulator circuit 17 of the present upravleshg dispenser K whose second input is connected

setpoint 18. Performance controller 17 is connected to the first summing inputs of the first adder 19 of the second adder 20, the second summation of the input of the adder 9 is connected to the output of the converter 4 speeds of the motor 3 of the feeder 1, and the readings of the adder 19 are connected

engine 9.

On the adder 20, the difference in the speeds of the engines 3 and 9, on the contrary, leads to the appearance of a positive difference in the second summing and subtracting input I:

Claims (2)

As a result, the signal at the control input of drive 2 increases, which is caused by call-1 from the output of converter 10 of engine speed 9. The second totalizing input of adder 20 is connected to the output of converter 10 of engine speed 9, and the subtracting input of adder 20 is connected to output of converter 4 of engine 3 The dispenser works as follows. In the initial state, when there is no signal at the output of the setting device 18, the signal at the output of the regulator 17 is zero. When a task is set at setpoint 18, the signal at the output of controller 17 begins to increase. At the same time, the signals to the control inputs to the drive 8 of the load-receiving mechanism 7 and the drive 2 of the feeder 1 increase. In drives 2 and 8, an increase in the signals on the control inputs leads to a decrease in the speeds of the drivers 3 and 9, respectively. The feedback, carried out with the help of converter 4 in drive 2 and converter 10 in drive 8, is carried out with precise control of the set leading speed by the command of regulator 17, input aa control input of drive 8 through the first adder 19 and control Yulday drive 2 through the second adder 20. Synchronous testing commands and 8 drives is carried out in conjunction with additional communication codes adders 19 and 20 seconds. The converters 4 and 10 of the speeds of the engines 3 and 9. If the speed of the engine 9 increases faster and becomes higher than the speed of the motor 3 of the drive of the feeder 1 between the second summing and subtracting inputs of the shock absorber 19 a negative signal difference appears, which reduces the value of the control signal coming from regulator output 7. Mixing the value of the control signal at the control input of the drive 8 to reduce the speed increases the speed of the engine 3. Thus, there is a mutual synchronization of engine speeds telephones 3 and 9, limiting the divergence of their velocities. In the 4c mode, setting the speed of the engine 3 (for example, reducing under the resistance to material draining) causes a similar cHCTei ej response to synchronizing drives 2 and 8. Thus, adders 19 and 20 added to the synchro circuit. They bake a reciprocal, fairly rigid connection in terms of speed, which makes it possible to eliminate deviations in the common control loop associated with a change in the amount of material on the load receptor. This, in turn, makes it possible to increase the sensitivity of the control loop and the uniformity of supply of the material being metered. The introduction of the proposed dosator especially effectively improves the accuracy of the dosage with the unevenness of the flow rate of the material in small time intervals (60-180 s). Claims of the invention A continuous weighing dosing unit containing a weight and a load receiving mechanism with drives each made in the form of an engine with a speed corresponding to the first input of the correction device, the output of which is connected to the actuator controlling the engine and connected to the load receiving mechanism a capacity calculation unit, the output of one of which is connected to one input of the regulator, to another input of which the output of the performance setting device is connected, characterized by that, in order to improve the accuracy of the dosage, two cyi 4a devices were inserted into it, the first summation of the two inputs of both adders are connected to the controller output, the second summing input of the first adder and subtractions of the second adder are connected to the output of the drive speed of the feeder, and the second summing input of the second adder and the readings of the input of the first adder are connected to the output of the converter of the drive speed of the load-receiving mechanism, to the second input of the correction device of which the first adder is connected And the second adder output is connected to the second input of the correction drive device feeder. Sources of information taken into account during the examination 1. USSR author's certificate f 502227, cl. G 01 G P / 02, 1974. 2. USSR author's certificate No. 584619, 1Ш, G 01 G 11/00, 1975 (prototype).