SU784911A1 - Apparatus for automatic regulating of speed of magnetite discharging from deslimer - Google Patents

Description

- The invention relates to the field of enrichment of magnetite ores and can be applied in automating the process of ore decalcification at ore-dressing plants. A device for automatic control of material unloading, a declarator, containing solid level sensors, a regulator, an actuator, is known. A device for automatically controlling the speed of unloading magnetite from a desiccator is known, which contains sensors for permissible upper and lower levels of magnetite, successively connected unloading regulator, drive and actuator for unloading magnetite 2. The automatic regulation of the institute is unloading magnetite a deslamator by maintaining the magnetite level in the decamer in a predetermined range of variation with disturbances in the deposition rate and quantity supplied for the desulfurization of the pulp, the magnetite density in the unloading of the deslator varies from 1.1 kg / l to 2.2 kg / l, which leads to an increase in the total losses of magnetite into the drain of the declamator; - and tails of the subsequent stage of magnetic separation . The object of the present invention is to improve the control accuracy. This goal is achieved by the fact that the device is equipped with a density sensor, a measuring circuit, a density adjuster and a correction controller, the density sensor being connected to one of the input of the unloading controller input, the other input of which is connected to the output of the reference device, the input which is connected to the output of the correction regulator, & the inputs of the latter are connected to sensors of permissible upper and lower levels. The drawing shows the functional diagram of the invention. The device consists of a bowl of casing 1, a magnetizing device 2, a rake 3, a rubber hose 4, a sensor for permissible upper and lower levels 5c floats 6 and 7 - a regulating device.7, an actuator 8, a device 9 for controlling the size of a sand hole (pinch device ) sensor 10 density, 11 - bridge measuring circuit 11,

sensor 12 density., razgruzhavtogo from the magnetite declarer, a corrective integral controller 13, the threshold circuit 14 of the upper permissible level sensor, the threshold circuit 15 of the lower permissible level sensor, the relay 16 of the upper permissible level sensor, the relay 17 of the lower permissible level sensor. ,

The device works as follows.

At the level of magnetite in the declarant, which is within the allowable range of changes, stabilization of the density of magnetite required for magnetic separators to the discharge of the declamator is carried out.

If the level of magnetite is in: an unacceptable range of variation, then the level of magnetite in the flying matrix is automatically controlled.,

The magnetite level in the declarator and the stabilization of the magnetite density required for magnetic separators in the unloading of the advertiser are controlled by changing the unloading speed of the magnetite from the declamator using the pinch device 9, which changes the cross section of the new section of the new hose 4. The magnetite density required for magnetic separators in the unloading of a declarator is determined experimentally on the condition that the permissible loss of magnetite in tails of magnetic separation is ensured.

The permissible range of magnetite level changes in a declarator is in the range from the upper permissible to lower permissible values of the magnetite level.

The value of the upper permissible level of magnetite in the advertiser b is also experimentally determined from the condition of ensuring the permissible loss of magnetite in the drain of the advertiser, and the value of the lower permissible level is determined from the condition of providing the necessary minimum in the drainage of the advertiser.

When the magnetite density required for Nynah separators is stabilized, the signal proportional to the density goes through the pavement measuring circuit 11 from the density sensor 10 to the input of the regulating device 7 For example, the proportional-integral controller, where it is subtracted from the setting signal 12).

In case of difference between the signals of magnetite density and the reference from the zero signal from the control device 7, it comes to the input of the actuator 8 (for example, a single-turn electric actuator of the IEC-Uk type), which acts on the pinch device 9, which changes the section of the rubber hose until density

The magnetite in the unloading of the declarator will not reach the required value.

The signal is proportional to the magnetite level in the advertiser and is fed to the input of threshold diagrams of the upper permissible and lower permissible levels 14 and 15 from the output of the level 5 sensor (for example, an IUF-2 angle angle transducer coupled to the float), which is affected by the float b .

When the magnetite level signal is in the advertiser exceeding the upper permissible value, the signal from the output of the sensor threshold circuit 14 is fed to the coil of the sensor 16, which enables its normally open contacts to be turned on and is constant in voltage to the input of the correcting integral regulator 13 which changes the reference signal at the input of the regulator 7 until the magnetite level in the declarator reaches the allowable range of variation. This establishes a new value for the desired magnetite discharge density from the declarer.

If the magnetite level is less than the lower permissible value, then the signal from the output of the sensor threshold circuit 15 is supplied to the coil of the relay 17 of the sensor 5, which ensures that its normally open contacts turn on and supply a constant voltage level to the input of the correcting integral controller 13, which changes the setpoint signal at the input of the regulating device 7 until the magnetite level in the unloading of the declarer reaches the allowable range of variation.

The implementation of the invention will allow to ensure in the range of allowable magnetite density values in the unloading of the declarator and to reduce the total loss of magnetite to the drainage separator and tails of the subsequent stage of magnetic separation.

Claims (2)

1. For the war of FRG 1226951, cl. 1 a, 6, pub. 1966. 2. Goncharova Yu. Automated control and regulation of technological processes at iron-ore dressing plants. M., Nedra, 1968, pp. 160-167.