JPH0364530A - Drafting device and method for operating a drafting device with one main adjustment device for the drafting device and at least one separate drive group for the break draft area - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention belongs to the field of textile industry, and claim 1 or (4) comprises one main adjustment device and at least one auxiliary adjustment device according to the generic concept of B. The present invention relates to a draft device having a draft device and a method of operating the draft device.

BACKGROUND OF THE INVENTION Various devices and conditioning devices for leveling slivers are known, which are based on the principle of sliver gold drafting.

Usually the sliver is doubled and leveled in a two-stage drafting process: a break draft and a main draft. It is customary to strive to produce as many slivers as possible within the framework of a drafting process, in which a large number of slivers are doubled at the same time. In corresponding drafting devices, uneven or defective slivers are produced at the inlet, and these slivers are required to have the best possible predefined cross section at the outlet. This requirement conditions the regulating device of the drafting process. The prior art includes various drive and regulating devices and closed-loop control devices and closed-loop control devices that address this problem.

Various problems arise in this housing configuration of the drive device.

Disturbances and fluctuations caused by the drive are certainly taken into account by known regulating devices. But only one
Taking into account the corresponding disturbances within the framework of one master regulator or all regulators requires compensation of a very large regulation range, which is not possible with conventional devices. At the same time, it has the disadvantage that the entire regulating load is centralized and the time dependence of the regulating device is not optimized.

OBJECT OF THE INVENTION The object of the invention is to eliminate the above-mentioned drawbacks and to provide a drafting device and a drafting device which, after setting the reference quantity for the adjusting device, allows an automated process sequence for optimally leveling the sliver. ,
An object of the present invention is to provide a method for operating a draft device.

Means for Solving the Problem This problem is solved by the features of the characterizing part of claim 1 or 6.

Advantages of the Invention In the drafting device of the present invention, the drives include a closed-loop auxiliary control circuit with regulators, so that disturbances and fluctuations generated by the drives are compensated for in the various drives, thereby reducing regulation negatives. without concentration, the time dependence of the regulating device is optimized.

EXAMPLES Next, the present invention will be explained in detail based on examples and with reference to the drawings. FIG. 1 is a schematic diagram of one embodiment of a draft device. A number of slivers 15.1-15.6, for example six, are combined side by side into one loosely connected nonwoven fabric and guided by a number of roller arrangements 1-6. By increasing the circumferential speed of the rollers in two stages in the transport direction of the fibrous material, the fibrous material is broken drafted in the first stage and further drafted (main draft) in the desired cross section in the second stage.
be done. The fleece 19 discharged from the drafting device is not thinner than the fleece of the supplied sliver 15.1-15.6 and is correspondingly longer. Depending on the cross-section of the fed sliver, the break-draft operation can be adjusted so that the sliver or fleece (7) is leveled during its passage through the drafting device (9), i.e. the amount of the discharged fleece is The cross section is more uniform than the lateral surface of the supplied fleece or sliver. This draft device has one break draft area 11 and one main draft area 12. It is obvious that the method of the invention can also be used in drafting devices with more than one or two break draft regions.

The sliver 15.1-15.6 is fed into the draft device by two conveyor roller devices 1 and 2. The first roller arrangement consists, for example, of two rollers 1.1 and 1.2, between which the sliver 15.1-15.
6 is transported. A roller arrangement 2 follows in the direction of conveyance of the sliver, which in this embodiment includes one active conveyor roller 2.1 and two passive conveyor rollers 2.1.
It consists of 2, 2.3. During the feeding by the roller devices 1 and 2, the fed slivers 15.1 (8) 15.6 are guided side by side into a nonwoven fabric 16. The circumferential speeds vl and V2 (=Vln) of all rollers of the two feeding roller devices 1 and 2 are equal, so that the thickness of the fleece 16 is equal to the thickness of the fed sliver 15.
The thickness corresponds approximately to 1-15.6 mm.

The two roller arrangements 1 and 2 are connected to a fifth row arrangement 3.1 and 3 of break-draft rollers in the transport direction of the fleece 16.
．． 2, the fleece is further conveyed between the third roller arrangement 3.1 and 3.2. The circumferential speed 3 of the break draft roller is higher than the circumferential speed of the inlet roller, so the fleece 16 is drafted in the break draft region 11 between the inlet roller 2 and the break draft roller 3, and is not traversed at that time. The surface shrinks.

At the same time, the supplied sliver 15.1-15.6
From this, a breakdrafted fleece 17 is formed. The break draft roller 3 has one active conveyor roller 4.1 and two passive conveyor rollers 4.2,
4.3 is followed by a roller device 4 which further transports the fleece.

Further, the circumferential speed V4 of the conveyor roller of the conveyor roller device 4 for conveying is the same as the circumferential speed V3 of the break draft roller 3.

The conveyor roller arrangement 4 is followed in the transport direction of the fleece 17 by a fifth roller arrangement 5 of main draft rollers 5, 1 and 5.2. The main draft roller also has a higher surface speed V5 k than the preceding transport roller, so that the break-drafted fleece 1γ is further drafted between the transport roller 4 and the main draft roller 5 in the main draft area 12. A draft finished fleece 18 is formed, the fleece 18 being consolidated into a sliver via the funnel Tf.

The finished draft fleece 18 is placed on a pair of six exit rollers 6.1 and 6.2, which have a circumferential speed ■6 (=”oub) equal to the circumferential speed of the preceding main draft roller (v5). trough] is removed from the device and stored, for example, in a rotating can 13.

The roller devices 1, 2 and 4 are driven by a first servomotor 7.1 via a transmission t, which is preferably a toothed belt. The break draft roller 3 is mechanically connected to the roller arrangement 4 so that the speed conversion ratio can be adjusted or a setpoint value can be pregiven. The transmission device is the circumferential speed (vln) of the inlet roller and the break draft roller 3.
, i, 3.2 to the circumferential velocity V3, and thus the break draft ratio.

The roller devices 5 and 6 are driven by a servo motor 7.2. The inlet rollers 1.1, 1.2 can likewise be driven via a first servo motor or optionally via a separate electric motor 1.3. According to the invention, the two servo motors 7.1 and 7.2 each have one own regulator 8.1 or 8.2. Furthermore, the actual value of one servo motor is connected to the other servo motor in one or both directions by control connection f3. e, so that each servo motor can react accordingly to deviations of the other servo motor.

At the inlet of the drafting device, the fed sliver 15.1-
15.6 is measured by the inlet measuring device 9.1. Sliver 1 discharged at the exit of the draft device
6 is measured by the exit measuring device 9.2.

The central computer unit 10 sets the initial setting value of the setpoint quantity for the first drive to 10. a through the first regulator 8.
Transmit to 1. The measured quantities of these two measuring mechanisms 9.1, 9.2 are connected 9. during the drafting process. a and 9. b to the central computer unit. From these measurement results and the target value of the cross section of the ejected sliver 18, the set value of the servo motor 8.2 is determined in the method according to the invention by means of a central computer unit and, if appropriate, further elements. This setting value is 10. b is continuously supplied to the second regulator 8.2. With this regulating device, variations in the cross section of the fed sliver 15.1-15.6 can be compensated for by correspondingly adjusting the main draft movement or evenly distributed in the sliver. can be obtained.

The drive structure of the present invention will be explained in more detail together with its adjustment operation using FIG. In this example, two servo motors 7.1 and 7.2 are used as main drives.

The servo motor 7.1 drives the inlet roller arrangement 1 and the conveyor roller roller arrangement 4, which follows the break draft section. Break draft roller pair 3
is mechanically coupled to the roller arrangement 4 and is therefore likewise driven by a servo motor 7.1.

The roller pair 1 at the inlet is driven by a servo motor 7.1 via an intermediate drive 7.3 (transmission), or
Alternatively, a further embodiment of the draft drive is driven by a separate servo motor 7.3. Servo motor7.
2 directly drives the main draft roller pair 5. A shifter funnel wheel pair or delivery roller 6 is also driven by the servomotor 7.2 via a transmission 7.4.

The drive of the can 13 at the outlet of the draft device is provided by an intermediate drive 7.5 (driven by a servo motor 7.2).
In a further embodiment of the drafting device, this can be done via a separate drive motor 7.5.

The drive arrangement is based on the fact that at least one drive group in the drafting device is driven separately by one electric motor. An electric motor is provided for each separate drive group of the truck in the break draft area or, if necessary, in the conveyor section or in other process-connected work stations. In the example shown, this is two motors 7.1, 7.2 for the break draft region 11 and for the main draft region 12. Basically, disturbances caused by the drive are compensated for within the framework of the overall system control system, ie the master regulation. However, according to the invention, each drive group is adjusted individually, i.e. by the corresponding regulator 8.
．． 1.8.2 and each drive group are interconnected, it has proven advantageous to provide one regulating device.

Advantageously controls adjustment deviations that occur in the entire system,
Particularly important is the fact that it creates better time independence or compensates in advance for all faults that may occur. Such a drive unit with auxiliary adjustment by regulators 8.1, 8.2 can be used in different main adjustment configurations.

The drive of the drafting device is divided into two levels: one main regulator 9, in which the central computer unit 10 performs the important functions; a, 9. b, 10.1110, b, and
It is adjusted with at least one auxiliary adjustment device 8.2 below for the main draft area. In this example, two
Two regulators 8.1 and 8.2 are provided. In the above-mentioned variant embodiments, it is also possible, if appropriate, to provide an adjustable regulator 8.3.8.5 (indicated by a dashed line). Advantageously, a position adjuster is provided (15) in conjunction with the two servo motors, which can also be configured, for example, as brushless DC motors. A regulating device in which one main regulating device, at least one auxiliary regulating device and a positioning device are interconnected reduces the load on the central computer unit 10 and eliminates the risk of large step changes occurring in the main regulating device. is reduced.

Main adjustment device9. a, 9. b, 10. a.10. b
is the setpoint cross-section of the discharged sliver and one or more of the supplied slivers 9. a and the discharged sliver 9
．． The target value calculated from the actual value cross section measured at b, for example the visual speed value, is 10, a or 10. b to the main drive motor 7.1 or 7.2. It is also possible to take other parameters into account depending on the configuration of the regulating device.

Auxiliary adjustment device 3. a-3,k to determine the speed of the individual drive motors 7.1 and 7.2 (in a variant embodiment also 7.3 and 7.5) using closed-loop position control circuits 8, a, 8. b and 8. c, 8°d (also including 8, f, 8-g and 8.i, 8.j in the modified embodiment) are adjusted (16) to the required set value from the higher adjustment level. The difference between the actual value and the set value of the awakening machine speed is determined by the position regulator 8. Control connection between L8.2 and 3. e (and possibly 8.k and 8.h) f: transmitted via. Eupnucle regulators 8.1 and 8.2 (8.3 and 8.5 as the case may be)
The deviation between the speed set value and the actual value of the motor located outside the adjustment range of the other motors is applied to the position adjuster of the other motors, and the deviation is applied to the speed set value of these other motors. It is also possible to compensate using a correction value. In this case, the corresponding return roof 0 to the central computer unit 10
It is also possible to provide In one advantageous embodiment, this correction takes place within the corresponding regulator.

The closed-loop control of the drive motors that determine the draft constitutes a drive device in which the positions of the drive motors are controlled in a closed-loop manner. For this purpose, an encoder or a resolver can be provided which supplies the angular position of the drive shaft as an actual value with a predetermined accuracy from time to time to a position adjustment device for this electric motor. Via this closed-loop position control circuit, the control device of the drafting device can adjust the angular position of the motor shafts and thus the rollers of the drafting device, which are driven by these motor shafts, relative to one another.

Such a drive allows a drafting precision that is significantly better than that obtained with a speed-adjusted electric motor. At the same time, the use of a position regulator (rather than a speed regulator) as an auxiliary regulating device offers the advantage of guaranteeing regulation even when the motor is stopped.

These advantages become more pronounced when the draft device is in full operation or in a 4G stop, since a significantly better adjustment precision is possible due to the lower rotational speeds at the stop. It is from.

However, the invention does not exclude the possibility of using speed-adjusted motors for the individual rollers that determine the draft, since such motors also allow for significant improvements over the prior art. While doing so.

As a regulator, a position regulator (and not a speed regulator) is used within the framework of the auxiliary regulator, since the position regulator ensures regulation even if the electric motor is stopped. The corresponding regulators 8.1, 8.2 (or other regulators as the case may be within the framework of the variant embodiments) (e.g. have a digital signal processor or a microprocessor)
It is also possible to include a separate computer unit or to configure it as a module of the central computer unit 10.

The invention thus begins with adjusting the separate drive units or groups of drafting devices separately from one another. A drive group in this case is a unit that includes at least one electric motor and also includes rollers or guide rolls or conveyor rolls driven by this electric motor. Such a drive group is, for example, a group 7.2.2 which in the embodiment of FIG. 2 includes an electric motor 7.2. 7.4.7.5.5 and 6. One advantageous embodiment of the drafting device is provided with a digital synchronized control of the drive group for rating setting. In this case, the drive group is used as the main drive. In this case, adjustment of the drive group is obtained by changing the nominal setting.

This makes it possible to supply setpoint values for the actuated variables, ie values for the draft or correction values, in advance from the entire adjustment device. Along with this, it must be taken into account that the master regulating device of the invention has to compensate for both short-term and slow disturbances. The drive of the invention allows one regulator in which regulator and drive group are interconnected, thereby taking advantage of improved time independence. Control connection 8. e.

8, h, 8. This likewise reduces the response time of the drive according to the invention. There is no need to detect drive fluctuations via a closed-loop control main circuit with response dead times.

This separate adjustment of each drive group has important advantages, especially when a large number of draft areas are provided, but only one or some of these draft areas are adjusted.

Such a region with a "constant draft" can be activated simply by presetting the target value without the need for adjustment by the master regulator.

2.1, 2.2... Conveyor roller, 3.1. 3
．． 2... Break draft roller, 4.1, 4.2...
・Conveyor roller, 5.1. 5.2 Main trough draw Both short-term disturbances and slow disturbances can be optimally compensated within the framework of this adjustment. The actuating variable determined by the main regulator, here for example for the main draft, is used as input variable for the corresponding regulator 8.2.

It should be noted here that the method of the invention is suitable for all installations of the textile industry that require adjustment of the drafting process.

[Brief explanation of drawings]

1 shows a schematic diagram of a drafting device according to the invention with a pre-drafting section and a main drafting section and a basic measuring device, and FIG. 2 shows a schematic diagram of a drive device according to the invention and a corresponding adjusting device. show. 1-6...Roller device, 1.1, 1.2...Roller,
13...cans, 15.1-15.6...sliver.

Claims (1)

[Claims] 1. A drafting device having one main adjustment device for the drafting device and at least one separate drive group for the break draft area, comprising:・4, 7.5, 5, 6) is a closed loop auxiliary control circuit (8.c) with regulator (8.2)
, 8.d), and at least one separate drive group for the break draft region. 2. Drive device for break draft area (11) (
7.1) and the drive (7.2) for the main draft area (12) each have one regulator (8.2).
1, 8.2) with one closed-loop auxiliary control circuit (8.1, 8.2) respectively, and these two regulators (
2. The drafting device according to claim 1, wherein the drafting devices 8.1, 8.2) are connected to each other via a control connection line (8.e). 3. The drafting device includes at least one separate drive group (7.3, 1) for the conveying section or for the work station which is connected process-wise to the drafting device;・3,1) is the regulator (8.3)
The draft device according to claim 1 or 2, characterized in that it includes a closed-loop auxiliary control circuit (8.f, 8.g) having a closed-loop auxiliary control circuit (8.f, 8.g). 4. regulator of separate drive groups for said conveying section (
8・3) in the draft area (11, 12).
1, 8, and 2). 5. The draft device according to any one of claims 1 to 3, characterized in that the adjusters (8.1, 8.2) are configured as position adjusters. 6. The drafting device according to any one of claims 1 to 5, characterized in that the drafting device is used in a combing machine for drafted sliver supplied from a combing head. 7. Adjuster (8.1, 8.2, 8.3, 8.
5) is preset by a presetting mechanism for a predetermined parameter (rotational speed or angular position) in the drive group, so that the regulator ( 8.1, 8.2, 8.3, 8.5) maintains the drive device group at this rated speed unless the set value is changed. A method for operating a drafting device having one main adjustment device for the drafting device and at least one separate drive group for the break draft region. 8. If the adjustment range of the regulators (8.1, 8.2) is exceeded, the setting values of at least one drive device group are matched via the control connection line (8.e). Claim 7
A method for operating a drafting device having one main adjustment device for the drafting device as described in 1. and at least one separate group of drives for the break draft area. 9. Operation of the drafting device according to claim 7 or 8, characterized in that a digital synchronous adjustment device is provided for the rating setting of the drive group, which can be varied to control at least one drive group. Method. 10. Method for operating a drafting device according to any one of claims 7 to 9, characterized in that the method is used in a drafting device in a combing machine for drafted sliver fed from a combing head. .