JPS5831406B2 - Device to control sliver weight - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for making the thickness of fed fibers constant by controlling the feeding speed of the fibers.

Conventionally, the weight of the sliver measured by a differential transformer was converted into an electrical signal to automatically control the transmission in the sliver supply section that was located a distance away, but the number of detection points and operating points was approximately three to three.
Because the distance is 5 m, the time it takes for the sliver to change speed at the operating point, that is, the transmission, and reach the detection point, that is, the differential transformer, becomes a "dead time." Control that is shorter than this dead time The disadvantage is that it cannot be done.

From another point of view, there is also the drawback that only the thick unevenness of the sliver can be controlled.

The present invention overcomes these drawbacks and will be explained in the following figures.

That is, the figure shows one embodiment of the present invention, in which 1 is an electric motor, 2 is a roller called a wrap roller wrapped with a raw material of a certain thickness and width, such as cotton, and 3 is a roller that wraps the wrap roller. a feed roller for sending out; 4 a speed reducer for decelerating the rotation of the electric motor 1; 5 a cylinder in which needles are planted to align the fiber direction of the wrap fed by the feed roller 3; 6 a speed reducer for the cylinder; 7 is a dosing device for stripping off the thin strip of cotton with uniform fiber direction from the cylinder 5;
numeral 9 is a speed reducer for the doffer, and numeral 9 is a measuring roller that applies pressure to the thin strip of cotton coming out of the dower 7 and turns it into a rope called a sliver 10 and sends it out.

The machine configurations 1 to 9 above are called a card machine.

11 is the weight of the above sliver 10 and is actually sliver 1
0, but if the density of cotton is constant, it will be the weight), 111 is the iron core, 1
2 is a rotation detector for detecting the rotation speed of the measuring roller 9; 13 is a reducer for the rotation detector; 14 is a middle roller composed of upper and lower rolls to which pressure is applied; 15
16 is a reducer for the middle roller, and 16 is an upper and lower roll that rotates at twice the rotation speed of the middle roller 14 when the sliver 10 is in a normal state, and applies pressure to the sliver 10 to give twice the draft. The front roller consists of:

In addition, from the measuring roller 9 to the front roller 1
The distance from the feed roller 3 to the measuring roller 9 is approximately 0.2 m, which is much smaller than the distance from the feed roller 3 to the measuring roller 9, which is 3 to 5 m.

17 is a reducer 18 that controls the rotational speed of the front roller 16.
An example of an induction clutch is an electromagnetic clutch that is controlled via a

171 is an excitation coil, 172 is a rotation detector, 19 is a can that stores the sliver 10 spun from the front roller 16, 20 is a speed reducer for the can, and 21 is an automatic/manual changeover switch; is OFF.

22 and 23 are converters that convert the outputs of the rotation detectors 12 and 172, and when the pulse type is used as the rotation detector, it becomes a frequency and voltage converter, and when the Liner type is used, it functions as an amplifier. It is what it is.

24 is an adder that outputs the sum of the outputs of the converters 22 and 23. Since the polarity of the output of the converters is determined as shown, the output of the adder 24 is the sum of the outputs of the converters 22 and 23.
The difference is

25 is an inverting amplifier that amplifies the output of the adder 24, and when the human power is ■, the output becomes e.

The output of the amplifier 25 is applied to the excitation coil 171 of the induction clutch 17, which determines the rotational speed of the front roller 16.

26 is an amplifier for amplifying the output of the differential transformer 11;
1 is because the amount of cotton supplied changes to a large width due to the replacement of the gear changer wrap 2 of the reducer 4 of the feed roller 3 of the card machine, etc.
This is an adjustment means for adjusting when changing the weight of 0.

27 is a weight setting device, 28 is the weight setting device and the amplifier 26
Since the manual polarity is determined as shown in the figure, the output of the adder 28 is the difference between the outputs of the amplifier 26 and the weight setting device 27.

29 is an inverting amplifier that amplifies the output of the adder 28;
91 is an adjustment means for adjusting the amplification rate of the reversing amplification device 29 by the spinning speed of the sliver 10 sent out by the measuring roller 9; 30 is a primary delay element that processes the output of the amplification device 29; 301 is a first-order delay element For example, it is a variable resistor, which is linked to the adjustment means 291 of the amplifier 29, and whose time constant changes depending on the spinning speed of the sliver 10.

The output of the temporary delay element 30 is manually input to the adder 291 during automatic operation.

Next, to explain the operation, first, when in manual mode, switch 21
is turned off and the card machine is operating at a certain speed (for example, the docker 7 is 2 Orpm), the measuring roller 9 is rotating at a corresponding speed, for example, Nl (rpm).

In addition, the converter 22 generates a voltage corresponding to this voltage, and the output of the converter 23 that generates an output corresponding to the rotation speed of the induction clutch 17 is converted into 1.
When set to 2, the human power of the adder 24 becomes (V2V1), and if this is ■, the amplifier 25 outputs ○, the current flowing to the excitation coil 171 of the induction clutch 17 and the generated torque decrease, and the rotation speed increases. It's coming down.

Therefore, (■2-■1) becomes smaller.

Moreover, if the amplification rate of the amplification device 25 is sufficiently large, the above (
V2V1) becomes close to "O", and if the rotational speed of the front roller 16 at this time is N2 (rpm), then in this state the ratio of the rotational speeds of the middle roller 14 and the front roller 16 becomes trough)K. .

That is, while the sliver 10 passes between the middle roller 14 and the front roller 16, it is stretched by twice as much.

Next, let's talk about automatic mode.

That is, the desired weight of the spun sliver 10 (for example, corresponding to 17IiIIIl) is placed on the measuring roller 9.

) is included. Therefore, the amplifier 26 at this time
If the output of is Vc, this amplifier 26 and weight setting device 27
Since the absolute values of the outputs of the adder and the amplifier 29 are also O, the output of the first-order lag element 30 is also O.

Therefore, the corrected human power of the adder 24 is O, and the multiplier 25 maintains the ratio of the spinning speeds of the middle roller 14 and the front roller 16 to trough)K.

Next, when the weight of the sliver 10 changes and increases by 10%, the output of the amplifier 26 also increases by 10%, so the adder 28
The output is +〇, IVc.

Furthermore, if the amplification rate of the amplifier 29 is R2o, the frequency of the large component of the unevenness of the sliver 10 is low, so there is no influence of the delay time of the first-order delay element 30, and the correction voltage is
Then ■ξ−−0. IVcXβ20 Formula (1) is obtained.

Therefore, with this correction voltage of ○, the adder 24 outputs e,
The reversing amplifier 25 provides an output, the excitation coil 171 of the ink-action clutch 17 is increased, the front roller 6 is accelerated, and the measuring roller 9 is
This is to compensate for the 10% increase in the thickness of the sliver 10 measured in .

Furthermore, if the speed of the front roller 6 increases by 10%, the compensation described above will be completed, and the converter 23 at this time will be fully compensated.
The increase in the output of is 0, I V2 = 0. I Vl・・・・・・・・・(
2), and the correction voltage Va in equation (1) must be equal to the increase in equation (2).

Therefore, if we consider only the absolute value, ■ξ1=0. I Vc X P20 = 0. I
V--"・(3) Formula VcXβ2o=■1...
......The correction voltage is determined from the above equation (3) using equation (4).

Also, from equation (4), the target value of the spun sliver 10 is exceeded (for example, the thickness IM is reduced by 50% to 0.5M).

), the adjustment of the amplification rate is determined.

In other words, in equation (4), the amplification rate of the amplification device 29 needs to be changed depending on the spinning speed of the sliver 10 as described later, so it must be considered fixed. If left as it is, the output will be 0.5 Vc, so equation (4) will no longer hold true.

Therefore, the amplification rate of the amplifier 26 is increased by the adjustment means 261 and the output is readjusted to Vc.

Next, assume that the speed of the card machine increases and the rotational speed of the docker 7 doubles to 40 rprn.

At this time, the output voltages of the converters 22 and 23 change proportionally, and are -2.1. +2■1.

Therefore, if the sliver 10 becomes 10% heavier in this state, in order to correct this it is necessary to speed up the front roller 6 by 10φ, so the amplifier 29
If the amplification rate of is β4o, the following equation holds true.

■ξl=0. IVcXβ4o=0. IX2V
l−・−(5) Formula β4o=−=2β2o・・・・・・・
...(6) Equation c,'' From Equation (6), it can be seen that the amplification rate β of the amplification device 29 needs to be increased in proportion to the spinning speed, and the adjustment means 2
91 is for achieving this purpose.

Next, the adjustment of the first-order lag element 30 will be described.

That is, if the time taken for the sliver 10 coming out of the measuring roller 9 to reach the front roller 16 when the dosing fan 7 is rotating at 2 Orpm is L (sec), then the large unevenness (40 to 50
In the case of m), it is not a problem, but there are small irregularities (4 to 5 m).
In order to control this, it is necessary to set the deviation output of the inverting amplifier 29 to a correction voltage Va in relation to the dead time.

Therefore, the variable resistor 301 is set to the adjusting means 2 of the inverting amplifier 29
It is related to 91 and changes.

The above has described an example of drafting by providing the middle roller 14 and front roller 16 at the exit of a card machine, but this can of course be applied to a filament machine as it is, as well as a spinning machine and the like.

Also, a differential transformer 1 is used as a sliver weight detector.
1 was described, but the sliver 10 is passed between two electrodes, and the sliver 10 is passed through a capacitive type or oriswiss-like nozzle that indirectly measures weight by the capacitance between the electrodes. Of course, it is also possible to measure weight by using a pneumatic system that measures weight by the pressure generated at the part.

As described above, in the present invention, since the sliver 10 coming out of the card machine is draft-controlled by the two relatively close rollers 14 and 16, even small irregularities in the sliver 10 can be corrected, and the spun sliver When changing the sliver 10 to a larger width or when changing the dot speed, a constant sliver 10 can be automatically obtained by simply changing the amplification rate of the amplifier using the adjustment resistor.

In addition, since the timing of correction is changed in relation to the dotting speed, it is possible to correct even the smallest unevenness in the sliver, and the controller that determines the reference draft during manual operation, that is, from the middle roller 14 to the front roller 16, is a so-called closed loop. Since it is controlled, a constant Q draft is maintained regardless of the deterioration of the mechanical system, and this draft is stably controlled according to the output during automatic operation.

Further, since an electromagnetic clutch is used as the transmission, various excellent effects can be achieved, such as an excellent sliver weight control device with small inertia and good responsiveness.

[Brief explanation of drawings]

The figure is a block diagram of a device for controlling the weight of a sliver, showing an embodiment of the present invention. 10...Sliver, 11...Detector, 14...First roller, 16...Second roller, 17... Electromagnetic clutch, 21...
...Auto/manual selector switch, 27...Sliver, weight setting device, 29...Track reversal amplifier, 30.
・・・・・・−Next lag element, 261°291・・・・・・
means of correction.

Claims (1)

[Claims] 1 a first roller that determines the amount of sliver fed; a second roller that determines the amount of feed of the sliver fed by the first roller and controls the weight of the spun sliver;
A detector for detecting the weight of the sliver, an inverting amplifier for amplifying the difference between the output of this detector and the output of the weight setting device, and a phase delay element for processing the output of this inverting amplifier. and,
The increase rate of the increaser is corrected by the setting value of the sliver weight setting device and the spinning speed of the sliver passing through the first roller, and the delay time of the delay element is corrected by the spinning speed of the sliver. a correction means, an electromagnetic clutch that is controlled by the output of the delay element and controls the rotational speed of the second roller, and an automatic/manual changeover switch inserted between the delay element side and the electromagnetic clutch side. A device for controlling the weight of the sliver.