SU1318292A1 - Apparatus for diagnosis of state of minced aggregate - Google Patents

Abstract

The invention relates to devices for diagnosing the condition of a grinding unit, mainly for wear of the armor in a cone crusher, and allows to improve the accuracy and reliability of diagnostics. The device contains a series-connected relay element 1, a sensor 2 of the active power of the crusher drive motor, the first scaling unit 3, the first computing unit 4, and the integrator 5, which form the first channel. It also contains the following: individually connected load sensor 6, second scaling unit 7, second computing unit 8, and first adder 9, which form the second channel. In addition, the device contains a second adder 10, 8 Il. .g f ixZ QjiJffx. -and kana / 00 00 th

Description

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The invention relates to devices for diagnosing the condition of a grinding unit, preferably for wear by armor in a cone crusher.

The aim of the invention is to improve the accuracy and reliability of diagnostics.

Fig, I is given a block diagram of an assumed device; Fig, 2 - the dependence of the input and output signals of the relay element (power idle); in fig. 3 diagram of the scaling unit; in fig. 4 is a diagram of a computing unit; in fig. 5 is a graphical interpretation of a power-law increase in the active power sensor signal; in fig. 6 is an integrator diagram; in fig. 7 is an adder circuit; in fig. 8 is a circuit for performing a strain gauge in the form of a bridge circuit consisting of strain gauges.

The block diagram of the device contains a series-connected relay element 1, a sensor 2 of the ac power of the drive motor of the crusher, the first scaling unit 3, the first computing unit 4 and the integrator 5, which form the first channel, as well as the series-connected load sensor 6, the second scaling unit 7, the second computing unit 8 and the first adder 9, which form the second channel. In addition, the device contains a second adder 10.

lU2g, y (Iigx) crushing power or rotor current of the drive motor; 00. (1) - idling power or idle current of a driving electric motor.

From the input pulse to the relay 1, corresponding to the rotor current of the drive motor 1, depends on the output impulse of the relay I i out (Fig. 2). The active power sensor 2 records the power that exceeds the idle power of the crusher.

The signal of the active power sensor 2 is fed sequentially to the scaling unit 3 and the computing unit 4, which convert the signal of the active power sensor signal corresponding to a mathematical expression

outgoing 3 W VH4

(I)

where a is the scale factor (a

- Ri).

R /

82922

t is the experimental coefficient depending on the type of stress state of the part. Pervp computational unit 4 5 (Fig. 4) implements a power increase in the signal of the sensor 2 active power. For simplicity and reliability of operation of unit 4, an approximation of this parameter is adopted, the essence of which is graphically shown in FIG. 5. In this case, the coefficient K is selected, allowing the value to be represented by an expression. The error of such an approximation depends on the interval of variation of the actual values (,,,, and, ensuring a given accuracy can be applied several intervals for the parameter, in which 20 different K-factors are realized.

Signal computing unit 4

25

KS enters the integrator 5, which implements the receipt of a common signal to use the resource health

These parts or units corresponding to the expression, i.e. takes into account

operating time and the level of energy load on the details of crusher units.

The second device-independent channel takes into account the overloading of parts and assemblies during the passage of the crushing space by indescribable bodies, which may be teeth of excavator buckets, drill bits, conveyor support rollers and just random objects. Signals from dates

The load 6 through the scaling unit 7 and the second computing unit 8, having an identical structure and purpose with the computing unit 4, enters the adder 9, in which the signal corresponding to the expression is realized.

1.aD

ml 3- etlX2

(2)

de aj - scaling factor; Ij. - the magnitude of the operation of the depreciation system; t, - coefficient dependent on

kind of stress;

i is the sequence number of the depreciation of the depreciation system. Legitimacy of using dependencies (2) for determining loads

the eccentric assembly follows from the theory of cone crushers, according to which there is a linear analytical relationship between the pressing force of the crushing bowls and the loads on the eccentric assembly, and the vertical displacements of the regulating ring when the damping system is triggered are equal to the average value of the additional deformation of the damping forces. springs arranged diametrically and arbitrarily

The magnitude of the additional strain of the damping springs can be measured, for example, using a conventional bridge circuit (Fig. 8), in which the resistances R ;, R- and Rj are compensatory, and R and RC are variable, with additional distortion of the damping system . 20 In the initial state RI Rj Rj

 R4 - R.T-. :

The signals of the integrator 5 and the adder, 9 are integrated by the adder 10, which forms the signal corresponding to the expression

W

fnl WHIRE7

t +

 .

(3)

 the signal corresponding to the use of the resource of an arbitrary part or unit is compared with the full resource of the same parts and units and thus the term is predicted

Jxx

the uninterrupted operation of the crusher and the development of strategies for the planning and preventive maintenance of the crushing plant.

Claims (1)

Invention Formula A device for diagnosing the condition of the grinding unit, mainly wear and tear of armor, containing the active power sensor of the drive motor of the crusher, relay element, first and second scaling units, integrator, first and second adders, characterized in that, in order to improve the accuracy and reliability of diagnostics , it is equipped with the first and second computational units and a load sensor, and the relay element is connected to the input of the active power sensor of the drive motor of the crusher, the output of which is through Consistently connected, the first scaling and computing units are connected to the integrator input, the load sensor is connected through the serially connected second scaling and computing units to the input of the first adder, and the integrator's outputs and. the first adder is connected to the corresponding inputs of the second adder. FIG 2 iSii tbinz-a ugj Fig.Z Newbie i, I- t / i "jt A -Wtftrw4," 2 UL / D. .J FIG. (JSb, .Ui8. (Jg A.d-og .g ( Oz (vi). Luz l / l "" dt I FIG 6 one ... n Jshhz