EP0816539A1 - Method and apparatus for production control in a carding machine - Google Patents

Abstract

In the system to control the operation of a carding appts., the rollers in the doffer zone are powered by one motor (M1) and the carded web laying is driven by a further motor (M3). A microprocessor (MC) alters the delivery speed, to give an automatic change in the drafting action between powered rollers, with a higher drafting in the prodn. mode than in the inching mode for threading through.

Description

The invention relates to a method for controlling a card, various Exit speeds require different distortions in the outlet area. Further The invention relates to a device for performing the method.

A method is known from British Patent Application No. 2 090 300 A, according to which the transition of the fleece starting from the customer to the other rollers of the Outlet is controlled. It is assumed that the Tensioning the fleece, which passes from one roller to another, the Outlet speed should be adjusted, especially during the Carding up or down. The known method includes that Regulate the warpage when handing over the fleece from separately driven Rolling at the card outlet, e.g. Calender and squeeze rolls. The tension of the fleece or tape is increased by a corresponding increase in the draft and vice versa. Depending on the carded material, the warpage for the rollers of the carding area are determined empirically. In Fig. 2 the British Patent application is shown a diagram in the form of a curve, from which the extent to which the distortion between the calender rolls and the squeeze rollers depending on the peripheral speed of the Pinch rolls (shown on the abscissa) changes.

The delay can be increased in various ways. The Pinch and calender rolls are driven by two separate motors, which are connected via a device for changing the delay. This can be a conventional gearbox with a variety of different settings or be a controllable clutch.

Furthermore, from the German published application DE 43 32 329 A1 a method for Production control, especially for the automatic change of delays at different production speeds. According to this procedure low warping in the area of low production speeds - e.g. 15% - and at high production speeds, e.g. 300 m / min. and about high delays - e.g. 55% - set.

According to Fig. 1b, e.g. Two electric motors are provided at the outlet, i.e. a Electric motor for the customer and the doctor roller and another electric motor for the squeeze rollers and the take-off rollers. When the delivery speed changes is a delay adjustment device, shown in Fig. 1a, the delay between the separately driven rollers, e.g. between the customer and the Take-off rollers set so that belt breaks can be avoided. The Adjustment of the delay between the customer and the take-off rollers and the Calculation of the new speed for the customer is based on the control 5 made. In an alternative solution according to FIG Distortion adjustment between the customer and the doctor roller instead of one separate motor, a continuously variable transmission is provided.

FIG. 6A in DE 43 32 329 shows the course of the default for given changes in delivery speed. When the Delivery speed, a microcomputer arranges the corresponding delay of the new one Delivery speed too.

According to GB 2 090 300 as well as DE 43 32 329, the delay should be optimal Delivery speed can be adjusted. This requires complicated controls and correspondingly controllable drives.

The present invention has for its object at the outlet of the card Changing the delivery speed of the delay in a simple way to be able to adjust during the ramp-up or the ramp-down. There may be delays between different rollers of the outlet, e.g. the customer and the Step roller, the take-off rollers and the step roller can be set. At Using a mechanical implementation unit, the delay can even be between Rollers which are driven by a common motor are set, which later in connection with the first embodiment of the invention is explained. The problem is solved by the features of claim 1.

The invention is based on the knowledge that there is actually no need for the delay continuously adapt to the delivery speed. Several are sufficient Define (individual or discrete) delay values for the phase-out, which at predetermined (corresponding) delivery speeds come into play. The delay between these predetermined delivery speeds is (strict taken) the delivery speed not "optimally" adjusted, but this plays for the System suitability is not an important factor. Main goal of default adjustment is to avoid cracks in the fleece, not to "optimize" the "fleece quality".

The invention provides for at least two discrete distortion values, each of which predetermined delivery speeds are "activated" e.g. at the creeper (Piecing speed) or above a specified delivery speed between the creeper and normal operation. Of course, more can discrete delay values are determined, each delay value being a respective one "Switching point" on the run-up or run-down curve of the card can be assigned. The switching points when ramping up can be the same as the switching points when ramping down the switching points when starting up can be compared to the switching points be different when going deep.

The suitable switching points can be determined empirically and in the programming the card control can be saved.

The rollers in the customer area are useful e.g. the customer who Transfer roller, the outlet rollers and the step roller by an electric motor and the calender rolls for the canister can be driven by another electric motor. Outlet rollers and the step roller are preferably by an electric motor can be driven via a switchable conversion unit, e.g. a gear coupling or a gearbox connected to each other. An initiator on the step roller can provide a microprocessor with impulses about the actual outlet speed, which with the outlet speed given to the microprocessor are compared. A The corresponding signal is sent to a frequency converter, so that the Controls the speed of the drive motor for the customer area. Change of Stopping speed on the one hand and the speed of the drive motor for the Buyer area on the other hand may require a corresponding change in the Distortion between the outlet rollers and the step roller e.g. when starting up the creeper on the operating speed. This is done in the following way: The signals mentioned above, which go from the initiator to the microprocessor, are registered by its default setting facility and a changed default is set by this at a predetermined switching point. Accordingly a signal is sent from the microprocessor to a switch box which the Gear clutch or the manual transmission appropriately adjusted. Will be appropriate a higher delay than in threading mode (crawl gear) in production mode set.

According to a first alternative embodiment, there are two at the outlet of the card Motors provided. The first pole-switching motor drives e.g. the customer who Transfer roller, the discharge rollers and the cross belt take-off, the second motor die Step rollers. The tape rack is driven by another motor. in the The first drive motor runs with the creeper (delivery speed of approx. 15 m / min.) Number of poles, e.g. 6 and minimal mechanical distortion between outlet rollers and Stepped roller. When starting up, this is e.g. switched to 8 poles. The delay between outlet and step rollers increases in the ratio 8/6 = 1.33. The related the delay adjusting device mentioned in the first embodiment calculates the new one Speed for the stepped roller. A corresponding signal comes from the microprocessor to the frequency converter, which determines the speed of the drive motor for the Step roller changes. In this embodiment, the two motors for the Customer area, possibly the motor for the tape storage of the same Frequency converter controlled. While the drive motor for the outlet rollers is switched, e.g. The drive motors for the run from 6 to 8 poles Step roller and the belt deposit with a constant number of poles. When recalculating the The speed of the stepped roller is not changed by means of the pole changeover of motor M2 but accomplished by the frequency converter, which uses the grid energy (e.g. 50 Hz three-phase current) converted into alternating current of corresponding frequency. This alternative offers a reduction in price by eliminating an engine control unit. Should during the Production phase Changes in delivery speed occur, if necessary from A corresponding signal via the switch box to the microprocessor pole switchable motor for the outlet rollers. The mass of the customer dampens the jump in speed at the customer. Via a correction control the feed roller is controlled so that there is no change in strip thickness.

According to a second alternative solution, the motors for the stepped rollers and Calender rolls can be switched and are both from 8 to 6 poles when starting up switched, the further motor for the other rollers of the run-out area, e.g. the discharge rollers run constantly. According to this embodiment, must the previously described embodiment, the new speed for the outlet rollers be calculated. This is also done by the above Frequency converter, which converts the mains current into the required alternating current for the Formed drive motor for the other rollers of the outlet area.

The invention is illustrated below with reference to drawings Exemplary embodiments explained in more detail.

Fig. 1 eine Teil-Seitenansicht und Teil-Draufsicht der Karde nach der Erfindung,

Fig. 2 ein erfindungsgemässes Blockschaltbild der Steuerung der Drehzahl der Stufenwalze und der Auslaufwalzen nach der ersten Ausführungsform,

Fig. 3 eine Teil-Draufsicht der Karde,

Fig. 4 ein erfindungsgemässes Blockschaltbild der Steuerung der Drehzahl der Stufenwalzen und der Auslaufwalzen nach der ersten alternativen Lösung,

Fig. 5 ein Blockschaltbild der Steuerung der Drehzahl der Stufenwalzen und der Auslaufwalzen nach der zweiten alternativen Lösung und

Fig. 6 eine Trendkurve von Verzug und Auslaufgeschwindigkeit.

It shows:

1 is a partial side view and partial top view of the card according to the invention,

2 is an inventive block diagram of the control of the speed of the stepped roller and the outlet rollers according to the first embodiment,

3 is a partial top view of the card,

4 shows a block diagram according to the invention for controlling the speed of the stepped rollers and the outlet rollers according to the first alternative solution,

Fig. 5 is a block diagram of the control of the speed of the stepped rollers and the outlet rollers according to the second alternative solution and

Fig. 6 shows a trend curve of warpage and run-out speed.

Fig. 1 shows the outlet of a card C50 from RIETER with the reel 1, the Customer 2, the transfer roller 3, the outlet rollers 4.5, the cross belt take-off 6 and the step rollers 7. The mentioned rollers (with the exception of the reel) and the A cross drive is assigned to a drive motor M1. The calender rolls 8 for the Kannenstock drives another M3 drive motor. The spout run in the crawl space Step rollers with minimal mechanical distortion. During startup, compared to the higher delay set in threading mode. As from Fig. 2 can be seen, the incoming information in the microprocessor MC for the Delivery speeds, cf. Signal S, in a delay setting device 14 through Comparison with stored empirically determining characteristic values determined and based on Corresponding trend curves will be the optimal delay for the discontinued and Step rollers calculated. A corresponding signal A goes to a switch box 13 an implementation unit, e.g. a gear coupling or a switchable gear, which sets the desired delay.

3 shows a further solution according to the first alternative embodiment. The Pickup 1, the transfer roller 3 and the outlet rollers 4,5 is a motor M1 assigned. The other drive motor M2 drives the step roller 7 and the Drive motor M3 the calender rolls 7. In this arrangement, motor M1 runs as pole-switching motor and motors M2 and M3 run with a constant number of poles.

In the crawl gear, as shown in FIG. 4, the microprocessor MC sends a signal to the switch box 13, which is connected to the motor M1. The pole-switching motor M1 runs, for example, with 6 poles with minimal mechanical distortion between the outlet rollers 4, 5 and the stepped roller 7. This time interval is shown in FIG. 6 with curve I. At a later point in time when starting up, the motor M1 is switched to 8 poles at a certain runout speed, see curve II in FIG. 6. The distortion between the runout rolls and the stepped roll increases in the ratio 8/6 = 1.33. Accordingly, a further signal goes from the microprocessor MC to the switch box 13 and the motor M1. The peculiarity of this embodiment lies in the fact that the drive motor M _{1 is} switched over from a low to a higher one during the run-up phase, while the other motors M2 and M3 run with a constant number of poles. Another special feature is that all three motors are controlled by the same frequency converter FU. After switching the drive motor M ₁ for the outlet rollers 4, 5 by the switch box 13, the speed of the stepped roller 7 must also be recalculated in accordance with the changed delay. The microprocessor MC calculates the new speed for the stepped roller 7 from the delay. A corresponding signal is sent to the frequency converter FU, which changes the speed of the drive motor M2 for the stepped roller. Since the drive motor M2 runs with a constant number of poles, its frequency can only be changed by the frequency converter FU.

Furthermore, this frequency converter also controls the speed of the drive motor M2 the production phase. Should signals in the microprocessor e.g. too high Delivery speed, this will be with the specified target values compare the delivery speed and a corresponding signal, cf. analogous Send control signal 11 in Fig. 2 to the frequency converter.

A second alternative solution is shown in FIG. 5 in conjunction with FIG. 3. in the Creeper run the two motors M2, M3 with number of poles e.g. 8 because of this At the time the delivery speed is low (approx. 15m / min.). When starting up these motors switched from 8 to 6 poles. The delay between the step roller 7 and the outlet rollers 4.5 increases in a ratio of 1.33. The corresponding The new speed of the outlet rollers 4.5 is calculated in the same way as previously in Described with reference to the first alternative solution.

The solutions according to FIGS. 4 and 5 are advantageous in that they have only one Frequency converters get by. This simplification gives rise to essentials Cost savings.

The basic principle of the new arrangement can be seen in FIG. Of the Delays in the outlet can be "switched" between two discrete values I and II. The lower delay I becomes at lower outlet speeds, the higher Delay II used at higher outlet speeds. It will be when starting up the card at a substantially predetermined outlet speed from Default I switched to default II according to the upward arrow. It will when the card is lowered at a second essentially predetermined one Exit speed from delay II to delay I according to the downward directional arrow switched. The "switching points" (the predetermined Run-out speeds) could be the same for run-up and run-down.

Instead of providing a single "switching step", several steps (one "Stairs") can be defined, but this significantly increases the switching or control effort.

Switching can be done electrically or mechanically. The switching points in Spout can be adapted to the design of the machine, with the Fleece tension should be influenced.

The invention accordingly provides a card with a switchable drive for the Spout before, switching the drive a change in delay for the Fleece transport causes. The card can be provided with a controller that the Switching the drive at at least one predetermined runout speed triggers. The switchable drive can be a switchable electric motor and / or switchable transmission include.

A sensor for the outlet speed can be provided. Then it can can be switched based on the output signal of this sensor. But this is not essential to the invention, since a very precise determination of the switchover point is superfluous. It is important that you switch before the outlet speed reached a value that is no longer adapted to the current default. Therefore a relatively wide "switching range" is possible, where one or the other delay can rule. It should be switched within this "gray area". A such an effect could also be achieved on the basis of a time control, the Time from triggering the ramp-up or this ramp-down is measured and at Is switched over a predetermined interval.

Legend

1

Drum

2nd

customer

3rd

Transfer roller

4.5

Discharge rollers

6

Cross belt deduction

7

Stepped roller

8th

Calender rolls for the can stock

9

initiator

11

Control signal

13

Switch box

14

Delay adjustment device

M1, M2, M3

Drive motors

MC

microprocessor

S1, S2

detailed information about delivery speeds

FU

frequency converter

UE

Implementation unit

V ₁ , V ₂

Delays

Claims (18)

Device for controlling a card during the rolling of the pick-up area is driven by an electric motor (M1) and the sliver reel is driven by a further electric motor (M3), and a microprocessor (MC) automatically sets a different delay between the separately driven rolls when the delivery speed changes ,
characterized,
that a higher delay is set in the production mode compared to the threading mode (crawl gear). Device for controlling a card during the rolling of the removal area are driven by two electric motors (M1 and M2) and the sliver is driven by a further electric motor (M3), and a microprocessor (MC) automatically changes the delay between the separately driven ones when the delivery speed changes Rollers
characterized,
that a higher warp than the threading mode (crawl gear) is set in the production mode. Apparatus according to claim 2, characterized in that the motor (M1) the Output rollers (4,5) drives and the stepped roller (7) by a motor (M2) is drivable. Device according to claim 2 or 3, characterized in that the motor M1 is a pole-changing motor and that the motors (M2, M3) have a constant number of poles exhibit. Apparatus according to claim 4, characterized in that the motor (M1) in the Creeper gear to a number of pole pairs e.g. 6 is switched on and in production mode a number of poles, e.g. 8, is switchable. Device according to claim 1, characterized in that for the separately driven rollers a switch box (13), which with a conversion unit (14) is connected, is provided. Device according to claim 1, characterized in that the motors (M ₁ , M ₃ ) are controlled by the same frequency converter (FU). Device according to claim 2, characterized in that the motors (M1, M2, M3) can be controlled by the same frequency converter (FI). Device according to claim 2 or 3, characterized in that the motors (M2, M3) are pole-switching motors and that motor (M1) is a constant number of poles having. Device according to claim 9, characterized in that the motors (M2, M3) in creeper with number of poles e.g. 8 and in production mode on number of poles e.g. 6 are switchable. Device for controlling a card during the rolling of the customer area by an electric motor (M1) and the tape storage by another Electric motor (M3) are driven and a microprocessor (MC) is provided characterized in that the distortion change between the outlet rollers (3,4) and the step roller (7) with a switchable mechanical Implementation unit, e.g. a tooth coupling. Method for controlling a card during the rolling of the customer area an electric motor (M1) and the tape storage by another electric motor (M3) are driven, and a microprocessor (MC) when changing the Delivery speed automatically corresponding to a changed delay between sets the separately driven rollers, characterized in that a compared to the threading mode (creeper) a production mode higher Default is set. A method according to claim 12, characterized in that the rollers of the Customer area are also driven by an electric motor (M2). A method according to claim 13, characterized in that the motor (M1) drives the outlet rollers (4, 5) and that the stepped roller (7) can be driven by a motor (M ₂ ). A method according to claim 13, characterized in that the motor (M1) is a pole-switching motor and that the motor M _{2 has} a constant number of poles. A method according to claim 13, characterized in that the motor (M1) in Creeper gear with one number of poles (e.g. 8) runs and in production mode to one Number of poles (e.g. 6) can be switched. A method according to claim 13, characterized in that the motors (M2, M3) Pole-switchable motors are and that the motor (M1) has a constant number of poles having. A method according to claim 17, characterized in that the motors (M2, M3) in crawl with a number of poles e.g. 8 run and in production mode on one Number of poles e.g. 6 are switchable.

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