SU1479574A1 - Arrangement for diagnosis of condition of working member of bucket-wheel excavator - Google Patents

Abstract

The invention relates to mining and can be used in the control systems of rotary excavators for the diagnosis of the working body (PO) when digging. The purpose of the invention is to increase equipment durability by controlling the variable component of the rotor drive load. During diagnostics, the PO signals from the power sensor 2 are fed to the inputs of the dividing unit (DB) 4, the second input of which receives a signal from the rotor drive speed sensor 3. From the output of DB 4, the signal characterizing the torque value of the motor 15 of the rotor bucket drive through the separation filter 10 and the amplifier 11 is fed to the input of the logic unit (LB) 8. The constant component of the moment from the second output of the filter 10 is fed to the input of the block 5 of the adjustable signal delay The second input of which receives a signal from the unit 12 controlled generators connected to the rotor drive speed sensors and the speed sensor 14 of the rotary boom conveyor. The latter is connected to the engine 15 of the rotary boom conveyor. The unit 12 of controlled generators is also connected to two integrators 6 and 13. Signals from the adjustable delay unit 5 are input to the integrator 6, and signals from the performance sensor 1 to the input of the indicator 13. In DB 7, the output signals of the integrators 6 and 13 are divided. The resulting signal from DB 7 is fed to input LB 8. The second input of LB 8 receives a signal proportional to the amplitude and frequency of the variable component from the output of filter 10 through amplifier 11. V LB 8 The signals from DB 7 and amplifier 11 are analyzed, and in display unit 9, a message appears on the state of the excavator PO and on the strength properties of the excavated rock. 1 hp ff, 7 ill., 1 tab.

Description

one

The invention relates to mining and can be used in rotor excavator control systems for diagnosing the condition of a working body when digging.

The purpose of the invention is to increase the durability of the equipment by controlling the variable component of the rotor drive load.

Fig. 1 shows a block diagram of a device for diagnosing the state of a working organ of a rotary excavator; Fig. 2 is a functional block diagram of a generator controlled; , on fig - a functional block diagram of the adjustable signal delay is functional; figure 4 is a functional diagram of the integrator; figure 5 is a functional circuit separation filter; figure 6 is a functional diagram of the logic unit; Fig. 7 shows the timing diagrams of the operation of a three-stable threshold device with an NOT element at the output and a logic block depending on the ratio of the integral values of the moment to the performance.

The device for diagnostics of the state of the working body of the rotor excavator contains a sensor 1 of performance, a sensor 2 of power, a sensor 3 of the rotor drive speed, a separating unit 4, a unit 5 of adjustable delay integrator 6, a separating unit 7, a logical unit 8, a display unit 9, a separating filter 10 , amplifier 11, unit 12 of controlled generators, integrator 13 and sensor 14 of the speed of the rotary arrow conveyor. Positions 15 and 16 rotate the engines of the rotary bucket of the rotary boom conveyor.

The block of controlled generators contains the scale blocks 17-19, the adder 20, the voltage converter 21 - frequency, the scale block 22, the voltage converter 23 - frequency.

Adjustable delay unit

ten

| 5 20

25

795744

Controlled oscillator unit 12 is an infra-low frequency generator.

The scaling factors of blocks 17–19 are respectively proportional to the time of unloading the buckets to the rotary boom conveyor, the time of lifting the rock mass in the rotor buckets before unloading and the time of moving the rock mass along the rotary boom conveyor to the location of the performance sensor. Thus, the output signal of the adder 20 is proportional to the time delay in the performance measurement channel o

Voltage Converter 21 — Frequency converts an analog signal into a sequence of infra-low frequency pulses proportional to the latency time in the performance channel. The scale factor of block 22 is proportional to the time for a complete revolution of the rotor wheel. Its output signal is also by means of a voltage converter 23 — the frequency is converted into a frequency characteristic of the rotor speed.

The adjustable signal delay unit 5 shifts the load signal at a speed proportional to the sum of the rotor speeds, the movement of the rotary boom conveyor and the movement of rock from the unloading point to the rotary boom conveyor, as the second input of the shift register 25 is supplied with a frequency signal from the controlled generator unit 12.

In integrator 6 on summing :. the input of the reversible counter 27 and the first input of the shift register 26 receives the signal load ro30 drive

35

40

a la contains an analog-digital converter of torus, simultaneously to the second input

the consignor 24 and the shift register 25.

The integrator contains a shift register 26, a reversible counter 27 and a digital-to-analog converter 28.

The split filter contains an inverter 29, an adder 30 and a capacitor 31.

The logic block contains a threshold element 32, an adder 33, a three-stable threshold device 34, elements NOT 35 - 41, elements NAND (42-45, rectifiers 46 and 47, key element 48 and comparator 49 of the zero level.

50

55

the shift register 26 receives an frequency signal from the control generator unit 12, as a result of which the information in this register shifts with a speed proportional to the actual rotor speed. Thus, the signal at the output of the register 26 contains information delayed by a time equal to the actual drive of the rotor revolution. This signal goes to the subtracting input of the reversing counter 27 where the calculation of the difference between the input values of this counter and the continuous determination of

torus, simultaneously to the second entrance

the shift register 26 receives a frequency signal from a unit 12 of controlled oscillators, as a result, the information in this register is shifted with a speed proportional to the actual rotor speed. Thus, the signal at the output of register 26 contains information delayed by a time equal to the actual drive of the rotor revolution. This signal is fed to the subtracting input of the reversible counter 27 where the difference between the input values of this counter and the continuous determination of 5 is calculated.

the integral in time of this difference, i.e. determining the integral of the difference in the input time function (in this case, the load of the rotor drive) and in the same function, which is late in relation to the current moment by a time equal to the actual period of the rotor rotation. The output of the counter 27 thus forms a continuously varying temporal code signal corresponding to a load integral over a sliding time interval equal to the period of rotor rotation. This signal is converted to an analog value by a digital-to-analog converter 28 and is fed to the input of a dividing unit 7. The integrator 13 is made in a similar way.

The load signal of the rotor drive is simultaneously supplied to the capacitor 31 and to one input of the adder 30, the variable component of the signal from the capacitor 31 is converted to an out-of-phase, identical in absolute value signal through the inverter 29 and fed to another input of the adder 30.

The device works as follows.

The signals from the power sensor 2 arrive at the first input of the dividing unit 4, the second input of which receives a signal from the rotor drive speed sensor 3. From the output of the dividing block 4, the torque value of the motor 15 of the rotor bucket drive is fed to the input of the splitter filter 10. The constant component of the torque from the second output of the splitter filter 10 is fed to the first input of the variable load block 5, where the signal M (t) is delayed by time 1 delay in performance measurement channel. The output signal of the delay unit SM (t-C) is fed to the first input of the integrator 6, at the same time the signal -q (t) from the performance sensor 1, i.e. the output signals of the integrators 6 and 13 correspond to the same time scale. The signal conversion is carried out in accordance with the expressions:. for integrator 6 t

MUHr (t- 1) -7g. j M (t-Odt, ip (-c; t-T. (t)

5746

for integrator 13

1 QMHr (t) - q (t) dt,

yy P TP (t)

where T p - the period of rotation of the rotor;

q (t) is the value of the current value

performance. In the splitter unit 7, the output signal of the integrator 6 is divided into the output signal of the integrator 13. The output signal of the unit 7 corresponds to e-

(t; fjl

relationship ratio

WO

and arrives at the first input of the logical block 8.

The variable component of the moment, from the first release of the separation

filter 10 is applied to amplifier 11, which forms a signal with a frequency and amplitude proportional to the amplitude and frequency of the variable component. This signal is sent to the second input.

logic block 8. In logic block 8, the signals from blocks 7 and 11 are analyzed and a message is displayed in the display unit about the state of the working body of the excavator and the strength properties of the excavated rock,

In the operation of logic block 8, four modes are possible, for each of which a light panel with an inscription is lit on the display block 9. Regardless of the mode, a zero level comparator 49 is constantly in operation, which, when there is a signal at the output, has a signal 1, a threshold element 32 that supplies a single signal, if the amplitude of the variable component of the signal exceeds the maximum value, the adder 33, a three-stable threshold the device 34 and the element HE 35, and the signal at the output of the element HE 35 may take the values + Un; 0; -U „(where II„ is voltage 1) depending on the size of the input signal M int)

Gnnt (Oh

For zero level comparator 49

five

xMint v

(g) 7 0, then U

and um

Wh x

4-9

- in.

, M in

M int.

(and) 0, then U

Ing

inMH 49

Itnm

For threshold element 32

m

7

then u

YOU 21

about. Ill and

 M „n then U6blxj, Oh,

where M p is the amplitude value of the variable component of the moment;

The operation of the logic block is explained in the output state table.

Appearance 1 at the element output

NOT 38 means n

II

broken scoop, on. output element NOT 39 -. .-, it at the output of the elemental normal mode that is NOT 40 - reducing the load of the output of the element 41 - the load.

to increase

Claims (2)

1. A device for diagnosing the state of a working body of a rotor excavator, containing performance sensors. rotor drive speed and soon and rotor boom conveyor, per l dividing unit, variable delay unit, the output of which is connected to the first input of the first integrator, the output of which is connected to the first input of the second dividing unit, the output of the second integrator is connected to the second input of the second dividing unit, characterized in that, in order to increase the durability of the working body of the rotor excavator due to the control of the variable component of the rotor drive load, the unit is driven by a generator c, dividing filter, amplifier, logic unit, display unit and power sensor, the output of which is connected to the first input of the first dividing unit, whose turn is connected to the input of the dividing filter, the first output of which through the amplifier is connected to the first input of the logical unit, the output of connected to the display unit, the output 14795748 M ПП - the threshold value of the variable component of the moment. 5 For a three-stable threshold device 34 with an output inverter  -U P The rotor drive speed sensor is connected to the second input of the first dividing unit and the first input of the controlled generator unit, the first output of which is connected to the first input of the variable delayed signal block, the output of the rotor arm conveyor speed sensor is connected to the second input of the controlled generator unit, the second output of which is connected with the second input of the first integrator and the first input of the second integrator, the output of the separation filter is connected to the second input of the adjustable delay unit, the sensor output roizvoditelnosti coupled to a second input of the second integrator, the output of the second dividing unit coupled to the second input of the logic block. 2. The device according to claim 1, that is, that the logical block contains seven NOT elements, four NAND elements, two rectifiers, a key element, a three-stable threshold device, an adder, a threshold element and a zero level comparator, output which is connected to the first input of the first NAND element, the output of which is connected to the first inputs of the second, third and fourth elements of the NAND and the input of the first element NOT, the output of the zero level comparator is the second input of the logic unit and connected to the input of the adder through three-stable threshold device connected in series and the second element is NOT connected to the cathode of the first rectifier and the anode of the second rectifier, the cathode of which is connected to the second input of the second AND-NOT element and through the third element is NOT connected to the second inputs of the third and fourth elements NOT, the anode of the second rectifier is connected to the input of the key element, the output of which is connected to the third input of the third NAND element and through the fourth element NOT to the third inputs of the second and fourth NAND elements, outputs Note. X is an indifferent state, meaning that may be present as 1 and the second, third, and fourth elements are NOT connected to the inputs of the fifth, sixth, and seventh elements, the outputs of the first, fifth, sixth, and seventh elements are NOT the output of a logic unit, the output of the threshold element is connected to the second input of the first element, and NOT, the input of the threshold element is the first input of the logic unit. Outputs 1 and O. Phie. one uh B yf S Ј gpf VЈS6Ј 7l