SU1750726A1 - Device for automatic discharge of hydraulic classification units - Google Patents

Abstract

SUMMARY OF THE INVENTION: The device comprises a accumulator, a shutter with an actuator, level sensors and rotary shutter positions connected to the controller inputs, the output of which through the power amplifier controls the actuator, the shutdown stop fixation unit, two time delay generator, element And and the driver pulse setup 2 Il.

Description

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The invention relates to the automation of technological processes of extraction and processing of non-metallic building materials.

A device for automatic control of unloading a hydraulic classifier is known, which contains a sensor for the amount of solid material in a hydro-classifier storage device, pressure sensors for liquid liquid in the storage device and the position of the rotary shutter for the material unloading window, connected to three regulator inputs, the output of which is connected to the actuator of the rotary shutter through power amplification , an exhaust gas temperature sensor for a diesel ground pump connected to the input of an adjustable reference source, turn is connected to the fourth input of the regulator, an apparatus is provided in the device passes large inclusions formed

based on two digital counters and a clock pulse generator. If during the specified time (determined by the first counter) the shutter did not reach the lower position when there was a close command (i.e., the oversized switch-on hit the shutter), the device generates a shutter-lift command to skip the oversized switch-on (the rise time is set by the second counter).

The drawback of the device is a fixed (and significant - up to 10-15 s) waiting time for a shutter-lift command (this time must exceed the total shutter movement time from one extreme position to another). Such a long period of time will lead to the development of powerful breakthroughs of the liquid phase through the discharge window, which disrupts the operation of the hydro-classifier.

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A device containing a drive, level sensors, two shutters with actuators and a controller is known.

The disadvantage of the device is its unreliability when working on materials with large inclusions. When a large switch falls under the first shutter and the Level reaches the minimum set value (which is not always the case in reality), the second shutter closes. When this happens, the material level begins to rise and when the setpoint is reached, the first shutter opens, skips a large start, and then the second shutter opens.

In addition, in this device, the unloading mode is intermittent, which is unacceptable for hydroclassifiers installed in the technological chain of high-performance projectiles (about 600 tons per hour and above); cases of seizure by large inclusions of the second shutter are not excluded and the way out of this situation is impossible without operator intervention; the system of two closures is not able to skip long inclusions (wood residues, roots, etc.), which often fall during the extraction of nonmetallic materials from the bottom of reservoirs; The mechanical system of two valves with actuators is rather complicated, cumbersome and unreliable.

The purpose of the invention is to improve the reliability of the device when working on materials with large inclusions.

The goal is achieved by the device for automatic unloading of hydroclassifiers, which contains a drive, a gate with an actuator and a power amplifier, level sensors and positions of a butterfly valve connected to the inputs of a regulator controlling the position of the butterfly valve, the output of which is connected through a power amplifier with the shutter actuator, additionally equipped with a shutter stop fixing unit, 1st and 2nd time delay shapers, AND element and formers a pulse of the initial installation, the input of the shutter stop latching unit is connected to the sensor of the gate position, and the output is connected to the first input of the element I, the second input of which is connected to the first time delay shaper, to the first input of which the second output of the regulator is connected, and the second is the output of the pulse shaper of the initial installation, the first input of which is connected to the second output of the regulator, and

the second input - with the second output of the 2nd time delay shaper, the first output of which is connected with the third input of the controller, and the input - with the output of the element

AND.

Figure 1 presents the scheme of the device; in fig. 2 - regulator circuit.

The device contains a drive 1, the shutter 2 with the actuating device 3.

Level sensors 4 and the position of the rotary shutter 5 are connected to the controller 6, which is connected to the actuator 3 through the power amplifier 7. The controller 6 includes amplifiers 8.9 of the signals of the level and position of the rotary shutter, the adder 10 and the open signal conditioners 11 and close the 12 rotary shutter 2.

The sensor 5 of the position of the rotary shutter 2 is also connected to the input of the shutter stop fixing unit 13, the output of which is connected to the first input of the element 14, to the second input of which the output of the 1st time delay shaper 15 is connected, to the first input of which the output of the shaper 12 is connected close the regulator 6, and to the second - the output of the former 16 of the pulse of the initial installation, the first input of which is connected to the output

the driver 12 of the shutter closure signal of the regulator b, and the second input - with the second output of the 2nd time delay generator 17, the first output of which is connected to the input 3 of the adder 10 of the regulator 6, and the input

- With the release of the element And 14.

The device works as follows.

According to the signals from the level 4 sensors and the position of the rotary shutter 5, the controller 6

through the power amplifier 7 and the actuator 3 controls the position of the rotary shutter 2, maintaining the specified level of material in the accumulator 1. When working on material with large

switching on, it is possible that they are jammed under the shutter as it moves downward (in this case there is a signal at the output of the shutter closure signal 12). The principle of the skip device

large inclusions (nodes 13-17) are as follows.

If, with a signal to close the rotary shutter (1 at output 12), if a large switch-on occurs under the shutter

stops (1 at the output of block 13), through element I 14, the 2nd time delay generator 17 is started and generates a pulse of fixed duration supplied to the adder 10

the regulator 6. At the same time, the shutter 2 (regardless of the signals of the sensors A and 5) rises by the time determined by the pulse duration of the 2nd shaper 17, thereby passing a large switch-on. Thereafter, the initial pulse shaper 16 sets the skip pattern for large inclusions to the initial state, and the controller 6 continues to control the unloading process.

Block 13 captures the moment when the shutter is stopped. The sensing element of the unit 13 is a resistive-capacitive bridge R1-R5, C1-C2, which is supplied with a signal from the rotary shutter position sensor 5 (constant voltage with an amplitude proportional to the degree of opening of the rotary shutter 2).

If the gate is stationary, the bridge is balanced at any constant signal level from sensor 5 (balanced with a resistor R3). If a changing signal from sensor 5 appears (when the gate moves) due to the presence of capacitances C1, C2, the balance of the bridge is disturbed and an error signal appears (the polarity of the error signal depends on the direction of movement of the shutter). The error signal is amplified by the amplifier on the operational amplifier DA1 (the resistor RG is used to set the output Ј) D1 O in the absence of the error signal). On the operational amplifier DA2, a comparator is assembled (the threshold is set by resistors R7, R8). In the absence of a signal from DA1 (the gate is fixed) at the comparator output for the displacement set from resistors R7, R8 is supported 1 (formed by the RIO circuit, VD1).

When the shutter moves at the DAT output, an amplified error signal appears, which leads to the appearance of the comparator DA2 O.

Thus, when the shutter moves downwards, at the exit of the block 13 for fixing the shutter stop, O is present, and when it stops.

The signal from the output of the shutter closure signal 12 is applied to the input of the 1st time delay shaper 15. When a shutter closure signal appears, a one-shot is performed on its front, performed on a DD1.1 (155 AHF) microcircuit, generating a pulse of a fixed duration, determined by the elements VT1, C3, R11, R12 (length of the order of seconds). A DD pulse 2.1-DD 2.2 forms a short pulse across its trailing edge, which sets the trigger DD4 1 at the output, i.e. 1 at the output of the 1st time delay shaper 15 appears after s after the appearance of the signal at the shaper 12 exit to close the shutter. This is necessary to avoid false

the operation of the block of the passage of large inclusions, since due to the presence of backlash in the mechanical connections, the gate starts to move not instantaneously when a command is received, but after a certain period of time.

Thus, when a large switch-on comes under the shutter (there is a signal to close - 1 at the output of the 1st driver 15 time delay, and

shutter - stationary - G at the output of block 13 fixing shutter stop) the signal from the output of element 14 triggers a one-shot DD1.2 of the 2nd time delay generator 17.

The duration of the At2 pulse is determined by the elements VT2, C4.R13, R14. From the output of the 2nd shaper 17 time delay, the pulse arrives at the adder 10 of the controller 6, regardless of the sensor signals

4 and 5, the regulator generates a signal to open the shutter at time At2. In this case, a large inclusion is carried out from under the shutter by the flow of material.

Shaper 16 pulse initial

Installation is used to set the skip scheme for large inclusions in the initial state. It consists of two identical pulse shaper units assembled on DD 2.3-DD 2.4-DD elements

3.2-DD 3.3. A reset impulse is generated either at the time of the disappearance of the shut-off signal (DD 2.3-DD 2.4), or at the moment of the appearance of the impulse to open with DD 1.2 (DD 3 2-DD 3.3). These pulses are combined with the DD 3.4 element and are applied to the C input of the trigger, set at its output O, prohibiting the operation of the device for passing large inclusions in the absence of a signal to lower the shutter.

Thus, the proposed device provides for automatic unloading of material from the storage unit by automatically skipping large inclusions that fall under the butterfly valve. With

Claims (1)

This does not require the introduction of additional sensors and unreliable mechanical assemblies (second gate) to solve the problem. Apparatus of the Invention A device for the automatic unloading of hydroclassification apparatuses, comprising a accumulator, a gate with an actuator and a power amplifier, level sensors and the position of a butterfly valve connected to the first actuator shutter, characterized in that, in order to improve the reliability of unloading material with large inclusions, it is additionally equipped with a shutter stop fixing unit, first and second time delay formers, element And, and the initial installation pulse shaper connected to the sensor position of the shutter, and the output - with the first input element fi.1 0 And, to the second input of which the first time delay driver is connected, to the first input of which the second controller output is connected, and to the second input - the output of the initial setup pulse generator, the first input of which is connected to the second input of the controller, and the second input to the second output In a second time delay driver, the first output of which is connected to the third input of the controller, and the input to the output of element I.  ; .. f 7 I “vlI i I Ik. "I ur.J V.1 Ш.2 Fig. 2