SU1500681A1 - Skip control apparatus - Google Patents

Description

The invention relates to ferrous metallurgy. The purpose of the invention is to increase the reliability of management. Skip hoist control device The invention relates to ferrous metallurgy, in particular, to blast furnace production, and can be used on blast furnaces with skip loading of charge materials.

The purpose of the invention is to increase the reliability of management.

The drawing shows a diagram of the device.

The device contains an inclined bridge 1, on which skips 2 move, a winch 3, to which a current sensor 4 is connected to the engine, and a sensor 5 connected with skip 2, compensation block 6 is connected to the drum 2

It consists of an inclined bridge, skips, a winch and its control system, an engine armature current sensor, a path sensor traversed by a skip, a rope mass compensation unit and a diagnostic unit. New in the invention is the limitation of the current value of the motor current to a current value * which corresponds to the allowable tensile strength of the rope c. taking into account changes in the mass of the rope and skip, as well as the strength characteristics of the rope. For calculating the limiting current, a diagnostic unit ₄ consisting of a setpoint adjuster, a signal reference value, summation, scaling, differentiation, signal multiplication, and comparison elements is introduced. The invention allows to reduce the emergency downtime of this furnace and improve its performance. 1 silt.

the weight of the rope connected to the output of the sensor 5 of the path, the strain gauge 7 measuring the mass of the material loaded into the skip 2, the control system 8 (winch 3, diagnostic unit 9, made in the form of the setting unit 10 of the reference value Signal, elements 11, 12 differentiation, elements comparison, elements 14 - 16 scaling, elements 17 multiplying ^ signals and elements 18-22 summation, element 23 scaling and element 24 summation.

The device works as follows.

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The command device signal begins the cycle of lifting skip 2 with the material, while the signal Γ _Ύ = C _mcf (Material mass) from the strain gauge $ 7

measuring the mass of material loaded into skip 2, is fed to the first; input, diagnostic unit 9, to the summation element 18, from the output of which the signal is E _g =? -, + A, (where A is a .u constant), proportional to the mass of skip 2 with the material, pos-; blunt to the input of the scaling element 14, from the output of which the signal P ₃ = “B, (where B is a constant high-15

rank), proportional to the 3 flywheel moment brought to the winch drum by progressively moving skips with the material, is fed to the input of the summation element 19 ·. From the output of element 20, the summation signal P ^ = P $ +

+ С, (where С is a constant value), proportional to the total flywheel torque of the drive and skips with material brought to the drum of the winch 25 3 * goes to the element 17

about 30

fractional acceleration of the winch drum, To the input of the element 12, the differential signals, the second in ^ ά'άΡβ

horn comes signal fx -t “ab

element 12 differentiation.

signal is received P ₆

ar?

from differentiation element 11,. 35

proportional to the speed of rotation of the drum of the winch 3. To the input of the differentiation element 11, the signal P ^ «= 1c <mc is received, from the sensor 5 of the path, proportional to the distance traveled by skip 2 along the inclined bridge

With the output of the element 17 multiplying signals. the input of the element 15 scaling signal P "=

В * »К у

"" Proportional to the dynamic moment on the winch drum 3. From the output of the element 15 to the first input scaling element 24 50

summation signal arrives P $ =

= Ρ _β Ό (where Ώ is a constant) proportional to the component of the allowable armature current of the engine, due to the dynamics of movement of the drive and skips with the material.

The signal P < ₀ = ςΡ ₇ (where ς is a constant value) from the output of the block 6 compensating for the change in the mass of the rope is fed to the third input of the diagnostic unit 9, to the summation element 20, from the output of which the signal P <^ =

= + Е (where Е is a constant value), proportional to the total mass of the rope attached to it, set [input to the input of the scaling element 16, from the output of which the signal Ец = Р-м'Р "(where 0 is a constant value), proportional to the additional static force in the falling branch of the rope, due to the mass of the rope and harness, is fed to the input of the summation element 21, from which the signal P ^ = P, < _a + Ζ (where Ζ is a constant value) proportional to the static force in the falling rope branch on the drum winch 3 at point "a", arrives at n The first input of the summation element 22, to the second input of which the signal P ^ = (where ~

constant values). from setpoint 11 of the reference value of the signal, proportional to the value of the allowable tensile strength of this type of rope.

• From the output of the summation element 22, the signal = P < ₃ , proportional to the difference of the static forces in the rising and lowering branches of the rope on the drum of winch 3 (the force in the rising branch of the rope is assumed to be equal to the allowable effort at times · the breakth 23, from which output signal Ρ _ί6 · = E ₃ - (Equi "diameter hoist drum 3), a proportional component of the motor current allowable, due acceptable Wuxi-ι Liem tensile used type of rope and rope changing weight, fed to a Ora input summing element 24, the output of which signal Ets- = Pj + Pj proportional allowable motor current is supplied to the input of the comparison element 13 ,, a second input signal which enters

from the sensor 4 of the armature current of the engine winch 3.

When the latter exceeds the permissible value of the armature motor current signal E ^, the signal from the output of the comparison element 13 enters the drive control system 8, which stops the skip hoist drive.

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The proposed device with a skip hoist is protected from the possibility of work with the efforts in the rope more than the allowable value that arises when additional resistance to the movement of the skip appears.

The use of a skip hoist control device reduces furnace stoppages due to the failure of the skip hoisting device and improves the performance of the blast furnace.

Claims (1)

Claim 15 The control device skip hoist, mainly driven by a rope and a winch, containing a winch control system, a winch motor current sensor, a skip path sensor and a rope mass compensation unit, characterized in that, in order to increase the reliability of control, a diagnostic unit is added to it, the first input of which is connected to the output of the load cell mass sensor in the skip, the second input is to the sensor of the path passed by the skip, the third input is to the output of the compensation block for changing the mass of the rope, the fourth input to the current sensor of the winch engine, and the output of the diagnostic unit It is connected to the winch drive control system. whozg 18 21 22 "55 23 nineteen