SU857723A1 - Batch-weighing system - Google Patents

Description

(54) SYSTEM OF WEIGHT PORTION DOSING

The invention relates to a weighing technique and can be used in charge systems for metallurgical, ore dressing and other industries that require a variable load into the hopper of a dispenser of various charge doses for a uniform time with the simultaneous sifting out of the small fraction of the charge from the loaded charge. A weight batch batching system is known, consisting of a feed bin, a weight bin with force measuring sensors, vibrating feeders, a dose setting device (1 The disadvantage of such devices is the lack of dropout of a small fraction of the material, as well as thickness control of the material layer in the grinder, the closest The proposed system is a weighing batch dosing system, containing a consumable bunker, a weighing bin with force measuring sensors, a feeder-screen with a limiting flap and lead , dose setter and dosing control device 2. The disadvantage of the system is an increase in the installation process cycle of dosing (exceeding it) while reducing the thickness of the layer of material on the feeder-screen for optimal screening of the fraction, as well as the effect on the duration of the dosing cycle of the unstable granulometric composition of the material , its humidity and other random factors during dosing at a constant TOJBmtHe layer of the charge on the feed pulp. The purpose of the invention is to obtain an optimal charge screening within the established cycle, regardless of the dose value. The goal is achieved by the fact that the system of weighing batch dosing is equipped with a regulator, a device for comparing signals, a transmitter of productivity and time for dosing, devices for dividing, integrating and differentiating by time, the output of the comparator through the regulator and actuator connected to the restrictive gate, and the first the input is directly, the second is through the time integration device — with the output of the setpoint controller and the dosing time, the third is directly, and the fourth

through a time differentiation device with an output of a dividing device, the inputs of which are connected respectively to the inputs of the control device, dosing ..

FIG. 1 is a schematic of a weight batch dosing system; and FIG. 2 - time diagrams.

The system contains a feed hopper 1, feeder-rumble 2, weight hopper 3, metering sensors 4, drive feeder-rumble 5, unit b dose, dosing control device 7, limiting valve

8, restrictive flap actuator

9, a controller 10, a device 11 for comparing signals, a device 12 for differentiating signals by time, a device 13 for integrating signals for time, a device 14 for dividing signals, a device 15 for setting the capacity and time for dosing.

The operation of the weight batch dosing system is carried out as follows.

The inputs of the dose control device 7 from the output of the dose setting unit 6 receive a signal F ,, proportional to the predetermined dose, and from the output of the load cells 4 the signal F, j is proportional to the instantaneous mass of the charge in the weighing bin 3.

The control unit dispensing 7 compares the signals E | and at the same time from the output of the device 7 a control signal is sent to the drive 5 of the feeder-rumble 2. With F, the dosing control device 7 activates the drive 5, and the feeder-rumble 2 vibrates, the charge flows from the feed bin 1 to the weight bin 3. the charge time on the feeder-rumble 2 fine fraction of the mixture is sieved through perforations in the bottom of the feeder-rumble 2.

A limiting damper 8 adjusts the thickness of the charge, converging on the feeder-rumble 2. The load cells 4 convert the charge mass in the weight hopper 3 into a proportional signal Fj. When the mass of the charge in the weight bunker 3 reaches the specified dose, the signal F, F and the dosing control device 7 turn off the drive of the feeder - screen 5 and stop loading the weight bunker 3.

From the output of the dose setting device 6, the signal F, proportional to a given dose, and from the output of the force-measuring 4, the signal F, proportional to the instantaneous mass of the charge in the weighing bin 3, is received in parallel with the control unit for dosing 7 and at the outputs of the device for dividing the input signals 14 from which the signal F is received directly proportional to the instantaneous value of the mass of the charge in the weight bunker 3 in proportion to the given dose. The signal Foj is fed in parallel to the input 3 of the device 11, the comparison of the input | Low signals and to the input of the device

12 differentiating the input signals by the time from which the input signal F arrives at the input 4 of the device 11 for comparing the input signals is proportional to the instantaneous load capacity of the weigh bin 3 as a fraction of the corresponding dose.

 At the same time, the output of the device 15 sets the capacity and dosing time in parallel to the input 2 of the device 11 of the signal comparison and to the input 13 of the device for integrating the input signals with time a signal FS is directly proportional to the task of the instant load performance of the weighing bin 3 in proportion to the given dose and inversely proportional to the task load time.

From the output of the device 13 for integrating the input signals, the input signal 1 of the device 11 for comparing the input signals receives the signal Fg SFgdt, which is directly proportional to setting the instantaneous mass of the charge in the weight bin 3 in proportion to the given dose.

FIG. 2 graphically depicts the dependence F SFgdt, since Fg const, Fg Fjt, where K is the gain factor and T is a constant of the device integration time.

The integration of the input signals in time and its non-significant settings, Fg depends on the task.

It can be seen from the graph that Fg is directly proportional to the time t and the task of the performance of Fg in proportion to the given dose, i.e. to signal. On the other hand t, / pj

whence it follows that the dosing time is inversely proportional to the signal Fg, since the% o signal is a task in time of the actual mass of the charge in proportion to the given dose in the weight bunker 3, then F, varies in fractional units from O to 1. Fg 1 dosing on assignment must end. Therefore, time t with Fg 1 is the setting of T with 1 metering time t,

K FS

those. inversely proportional to the setting of the Fg signal.

From the graph it is clear that when

Claims (2)

The irF5H FB-I and V PS output of the device 11 compare the input signals to the input of the controller 10 and receive the error VG% -Ec. The regulator 10 forms the law of regulation. From the output of the regulator 10, the limiting valve actuator 9 receives a control signal Fg, which takes on values greater when F Fj, or Fg, less when F, j Fj, or FF and Fg 0 when FF and Fyj Fj-, I When Fg 0 restrictive damper 8 stops at a position in which the thickness of the charge layer on the feeder-rumble 2 corresponds to a given capacity and dosing time. . The application of the proposed system will allow to ensure the optimal regimes of screening of the charge for a given time cycle, which increases the productivity of labor and improves the quality of the dosed charge. Claims of the Invention Portion Weight Batching System, comprising a weighing bin for a weighing bin with load cells, a feeder screen with a limiting flap and a drive, a dose setting device and a dosing control device, the inputs of which have a dose setting device and force sensors different from that , in order to obtain the optimum charge-out of the charge within the established cycle, regardless of the dose, it is equipped with a regulator, a signal comparison device, a unit for performance and dosing time, dividing, integrating and time differentiating devices, the output of the comparison device through the controller is connected to the restrictive gate, and the first input is directly, the second through the time integration device - with the output of the output knob and the time for dosing, the third directly and the fourth through the device is differentiated | G in time with the output of the dividing device, the inputs of which are connected respectively to the input of the dosing control device. Sources of information taken into account in the examination 1.S.P. Orlov and others. Scales and dispensers. Directory. M., 1972, pp. 140-141. 2.S.P. Orlov and others. Scales and dispensers. Directory. M., 1972, p. 142 (prototype).