Method of detecting metal particles in displaced fibrous material

FIELD: textiles, paper.

SUBSTANCE: invention relates to the field of engineering for light industry and can be used to create the systems for detecting metal particles in textile materials, in nonwoven substrate in production of synthetic leather, felt, etc. The method of detecting metal particles in the displaced fibrous material consists in placing the displaced fibrous material in the working area of induced coil of oscillating circuit in which high-frequency oscillations are created using the generator. Further, amplification and detection of high-frequency output voltage of the generator is carried out. At that at the output of the amplifier-detector the impulse of the required duration for reliable operation of the actuating mechanism is formed. The output voltage of the amplifier-detector is compared with driving voltage. The resulting voltage difference is integrated, and the voltage is applied at the output of the integrator to stabilise the amplitude of high-frequency voltage at the generator output, and the integration process is interrupted for the duration of the impulse formed.

EFFECT: increase in reliability of detection of metal particles in the displaced fibre material and providing automatic compensation of external disturbing actions.

1 dwg

 

The invention relates to the field of machine building for light industry and can be used for the detection of metallic particles in textiles, non-woven fabric in the production of synthetic leather, felt, etc.

The known method of detection and removal of metal particles in a moving material (patent RF №2180373, D06H 3/14, 2001), namely that the material moves through the zone of operation of the three detection sensors arranged at an angle of 45, 135 and 90° relative to the direction of movement of the material, and the zone of removal of metal particles located from the detection area at the distance of transport delay, and information about the presence of metallic particles in the material take from the first detection sensor, fix the time of admission, remember this information in the form of a single pulse and move it synchronously with the movement of material through the stepping pulses from the displacement sensor material, similarly accept and move information from the second detection sensor, capture the moment of the presence of metallic particles in the material of the third detection sensor, from which the form and remember the signal in the form of a single pulse, reads the code stored information from the first and second detection sensors, compute this in�ormatie coordinate of the location of the metal particles to the width of material in each section and recorded in the control unit, and the control unit form the control information to enable the Executive bodies of removal of metal particles, wherein a single signal from the third sensor detection and memorized by this point information from the first and second detection sensors are placed on the value of the transport delay synchronously with the material with the help of step pulses from the displacement sensor, and at the end of the transport delay form a single signal, which reads the code information from the first and second detection sensors, recorded after further displacement, calculate from this information the location of the metal particles to the width of material in each section and record in block management.

The disadvantage of this method is associated with the complexity of its implementation and the lack of adaptability to changing external conditions.

Known "Method of detection of metal objects in the tissues" (Copyright certificate of the USSR No. 97710, IPC D06H 3/14, 1954), adopted as a prototype, which consists in generating high frequency oscillations in the resonant circuit, the placement of relocatable textile material inside the coil inductance of the oscillatory circuit, the amplification and detection of high-frequency voltage at the output of the generator and the bulk� lowering the voltage at the output of the amplifier-detector of a pulse of the required duration for reliable actuation of the actuating mechanism.

The disadvantage of this method is its low reliability and noise immunity environmental uncertainty and parametric perturbations.

The technical result of the proposed method is to increase the reliability of detection of metal particles in floating fibrous material and providing automatic compensation for external disturbances.

The technical result is achieved in that in the method of detecting metal particles in floating fibrous material comprising the generation of high frequency oscillations in the resonant circuit, the placement of floating fibrous material in the working area of the coil inductance resonant circuit, the amplification and detection of high-frequency voltage generator output and the formation when the voltage at the output of the amplifier-detector of a pulse of the required duration for reliable actuation of the actuating mechanism, the set of conditions required sensitivity of the amplitude of the high frequency voltage output of the generator, converts the voltage output from the amplifier-detector and compare it with the reference voltage, and the resulting voltage difference integrates and applies the output voltage of the integrator for the stabilization of the amplitude of the RF voltage on �the application program generator, moreover, the process of integration is interrupted for the duration of the generated pulse.

The drawing shows a block diagram of a device that implements the proposed method for the detection of metallic particles in floating fibrous material.

This device has connected in series a high-frequency generator 1 with an oscillatory circuit comprising an inductance coil 2 and the capacitance 3, the amplifier-detector 4, the pulse shaper 5 and the actuator 6.

To the input of a high frequency generator 1 is connected to the output of the first comparison unit 7, to the respective inputs of which are connected to the output of master unit 8 and the output of the integrator 9.

To respective inputs of the second comparison unit 10 is connected to the output of master unit 8 and the output of the voltage Converter 11, the input of which is connected to the output of the amplifier-detector 4, and the output of the second comparison unit 10 is connected to the first input key 12, to the second input of which is through the logical element "NOT" 13 is connected to the output of the pulse shaper 5. The output of the key 12 is connected with the input of the integrator 9.

The method is as follows.

With the passage of the fibrous material 14 with a metal particle 15 through the working area of the inductance coil 2 decreases the amplitude of the voltage at the output of the high frequency generator 1, sledovat�till then, is reduced and the DC component of the output voltage of the amplifier-detector 4, at which threshold the pulse shaper 5 generates a pulse whose duration is determined by the conditions of reliable inertial actuation of the actuating mechanism 6.

In the initial state, the amplitude of the voltage at the output of the high frequency generator 1 is installed in accordance with the voltage of the job output setting unit 8 for the purpose of reliable detection of specific metal particles 15 in the fibrous material 14.

When you change the amplitude of the output voltage of the HF generator 1 under the action of external conditions and/or parametric perturbations varies as the voltage at the output of the amplifier-detector 4 and the output voltage of the voltage Converter 11, which provides the amplification and suppression of the variable component of the input signal.

The voltage difference at the outputs of the master unit 8 and the voltage Converter 11 through the switch 12, the supported logical element "NOT" 13 in the open state, is fed to the input of the integrator 9, which provides a static correction of the amplitude of the output voltage of the high-frequency generator 1 and its stabilization at a given level.

For example, when reducing the amplitude of the voltage at the output of the high frequency �of generator 1 and, as a result, when the voltage at the output of the voltage Converter 11 relative to the voltage of the job output setting unit 8, the voltage at the output of the integrator 9 will be summed with the voltage of the job to fully restore the original settings. In other words, there will be compensation of disturbing external and/or parametric perturbations that affect the amplitude of the output voltage of the HF generator 1.

By analogy with the amplitude of the voltage at the output of the high-frequency generator 1, the voltage at the output of the integrator 9 will be deducted from the stress of the job, which will lead to a decrease in the amplitude of the voltage at the output of the high frequency generator 1 to the specified value.

At the time of detection of metallic particles 15 logical element "NOT" 13 receives the pulse output from the pulse shaper 5 and interrupts the integrator 9, excluding false reconfiguration of the generator 1.

Upon the termination of the pulse at the output of the pulse shaper 5, the device returns to its original state.

Thus, implementation of the proposed method allows to increase the reliability of the detection of metallic particles in the fibrous material and to provide automatic compensation for external disturbances.

Method of detecting metal particles � floating fibrous material, including the generation of high frequency oscillations in the resonant circuit, the placement of floating fibrous material in the working area of the coil inductance resonant circuit, the amplification and detection of high-frequency voltage generator output and the formation when the voltage at the output of the amplifier-detector of a pulse of the required duration for reliable actuation of the actuating mechanism, characterized in that the set of conditions required sensitivity of the amplitude of the high frequency voltage output of the generator, converts the voltage output from the amplifier-detector and compare it with the reference voltage and the obtained voltage difference integrates and applies the output voltage of the integrator for the stabilization of the amplitude of the RF voltage at the output of the generator, moreover, the process of integration is interrupted for the duration of the generated pulse.



 

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