DE19836861A1 - Drive system to move the ring frame at a ring spinner has an array of pull cables from a powered belt disk to give structured movements at the top and bottom dead points - Google Patents

Abstract

The mechanism to raise and lower components which guide yarn movements, especially the longitudinal rails or ring frames (10) along a ring spinning machine with pull cables (9), gives a slow acceleration to the alternating movements of the ring frame (10) at each top dead point and a rapid braking action at each bottom dead point. The mass in the mechanism can be given an equal and rapid braking before reaching the top dead point. The acceleration at each top dead point is at a rate of 0.1-0.2 m/s<2>, and the rapid braking action at each bottom dead point gives a delay rate of 0.25-0.5 m/s<2>. At the bottom dead point, an acceleration is developed slowly at 0.1-0.2 m/s<2>. A slow braking can be applied at the top dead point at 0.1-0.2 m/s<2>. The acceleration can be rapid at the bottom dead point. At the bottom direction change point, a dead time is held for 10-20 ms between the downwards and upwards movements. At the top dead point, a movement stoppage time of 30-50 ms is held between the braked movement and the following accelerated downwards movement. An Independent claim is included for an assembly with a pull cable system (9) to move the ring frame (10) which is suspended from the pull cables (9.1-9.3) alone for the vertical forces. Preferred Features: The pull cable system (9) is connected to the belt disk (8) of a drive gearing (3). They pass over at least one deflection (11.1,11.2) along the horizontal longitudinal direction or across it. The drive motor (5) is controlled by a frequency setter, linked to a control which is also connected to sensors (16) and a data input station. The control gives nominal frequencies for the frequency setter according to the technological data fed in through the input and the parameter measurements from the sensors (16) such as the output from the sliver drawing stage, the stroke movement of the ring frame (10) and the movement pulses of the drive (3,5) for the ring frame (10). A sensor (16) transmits absolute values. A brake and a pulse generator (16) are at the motor (5). The motor (5) is linked to the drive gearing (3) by a toothed belt (4). The belt disk (8) with the pull cables (9) is fitted to the output shaft (7) of a screw gearing (3). The motor (5) is structured to require a reversing time span of 10-20 ms. The dynamic moment of the motor (5) in Nm, divided by its natural inertia mass in kg/m<2>, is \-4000.

Description

The invention relates to a method and a device for lifting and / or lowering ken of thread-carrying parts, in particular of one in the longitudinal direction of a ring spinning machine running rail or a ring frame, by means of tension elements, which are connected to a pulley of a transmission, the tension elements circulate at least one deflection and in sections in the horizontal longitudinal direction device or transversely to the device.

From DE-OS 43 43 966, for example, a drive device for a ring Bank of a ring spinning or twisting machine known, which at least one that Has ring bank over tension members driving drive roller, which via a min least a reduction gear accompanying a spur gear stage and a worm gear stage gear is connected to a drive motor. The tension elements are over several pulleys led to this drive roller so that the frictional resistance load the gearbox and motor additionally.

The same applies to DE-OS 37 06 513, in which between the drive motor and Ring bank several gear transmission stages are provided.

The present invention has for its object the motion transmission to make the ring bench as smooth as possible. The task also arises To design motion laws in such a way that the textile technical requirements at the Further processing of the cops is taken into account.

This object is achieved by a method and a device according to the features of independent claims solved. The dependent claims relate to advantageous ones Training.  

In one embodiment of the invention, it is provided that the motor is driven by a Frequency controller is controlled. This is connected to a controller that again with appropriately designed sensors or sensors and an on is connected. A computing unit in the control system determines target frequencies for the frequency controller, depending on the technological data from the input device and from the parameters determined by the sensors or sensors. To this Above all, parameters count the delivery, that is, the delivery quantity of the stretching unit kes, the stroke of the ring frame and the movement impulses of the drive for the ring frame.

The one sensor or encoder, which determines the stroke of the ring frame, should come before be configured as an absolute encoder. He is thus able to change the position of the Specify ring frame absolutely, which means that in the event of a malfunction, for example Power failure, the actual ring frame position is not lost.

Furthermore, the motor for driving the ring frame stroke with a brake verse hen. This brake is particularly effective when, for example, when there is a voltage cut if the ring frame tries to lower itself. The brake acts on this lowering opposite. In the event of a power failure, it can block the motor shaft, for example. At The drive is held in normal standstill by boosting the frequency controller.

The motor should be preferred with the gearbox via a positive drive element be connected via a toothed belt.

It is also provided within the scope of the invention as a motor for lifting the Rin grahmens to provide a liquid-cooled synchronous motor. It means that the engine is connected to a cooling circuit and a cooling medium is flowed through. Such motors can also be used for other drives Find spinning machine application.  

The ring frame should preferably not be raised linearly, but in the pilgrim step process. This means that the motor reverses several times that must. Reversing a motor is braking the motor, understood his turning and accelerating. This must be done as quickly as possible happen. This ring frame drive also serves the variable, programmable ren "rear / under winches" when building the cop. That also means very fast engine movements over a sleeve length. For an engine that meets these requirements, it must be a highly dynamic engine.

The device manages without retraction elements for the ring frame ( 10 ) downwards, if after the reversal of movement of the ring frame ( 10 ) is accelerated with a slight acceleration between 0.1 and 0.2 m / s ² at top dead center. On the other hand, at least a rapid braking with a deceleration value between 0.25 and 0.5 m / s ^{2 is} necessary in the bottom dead center in order to avoid problems due to thread tearing for the rewinding process of the yarn that follows the spinning process.

The invention is described below with reference to an embodiment shown in the drawing example explained in more detail. This drawing shows in

Fig. 1 shows a schematically represented in a ring spinning machine with an embodiment of the invention,

Fig. 2 is a circuit diagram for controlling a motor that is pre-switched a transmission, and

Fig. 3 is a stroke diagram of a ring frame.

Parts 1 and 2 of a machine frame of a ring spinning machine are indicated in FIG. 1. A gear 3 is attached to part 1 and is connected to a motor 5 via a toothed belt 4 . The toothed belt 4 wraps around corresponding pulleys and drives a gear shaft 6 when the engine 5 is operating. This gear shaft 6 leads into the interior of the gear 3 , which is designed as a helical worm gear.

An output shaft 7 , on which a pulley 8 is seated, projects laterally from the transmission 3 . This disc 8 is wrapped by one or more traction elements 9 , a ring frame 10 being attached to traction elements 9.1 , 9.2 and 9.3, for example. In order to loop the tension elements 9.1 to 9.3 between the disc 8 and the ring frame 10 deflections 11.1 to 11.3 . Between the deflections 11.1 to 11.3 and the disk 8 , the tension elements 9.1 to 9.3 are no longer deflected, but run directly tangentially onto the disk 8 . For the pulley 8 is also an embodiment as an eccentric in order to Chen compensation for the conical sleeve.

The direct tangential guidance of the tension elements 9 in the longitudinal direction of the device presupposes that the motor 5 is operated under program control, so that the ring frame 10 , as indicated by dashed lines in FIG. 3, moves in the pilgrim step method between the diagonally extending lines. The lines indicate the reversal points from the upper to the lower position and vice versa. A stroke h of the ring frame is plotted over a delivery l of a drafting system. During the delivery quantity l ₁ , the stroke increases linearly, for example, from the value h ₁ to h ₂ , with no stroke displacement Δh / Δl taking place. The ring frame then moves upwards under program control, with a constant stroke displacement taking place after each up and down movement by the dimension h ₂ .

According to FIG. 2, the parameters h ₁ , h ₂ , l ₁ , .DELTA.h / .DELTA.l, which are passed together with other technological data to the control system PLC via an input device 14 , are processed by algorithms in a processing unit, namely in Dependence on the delivery 1 of the drafting system 19 and the position or the stroke h of the ring frame 10 . The delivery 1 is determined by a transmitter 21 on a rotating part of the drafting system 19 , which is shown schematically with a motor 18 , a gear 20 and a drafting cylinder 22 .

Another encoder 16 determines the absolute stroke h of the ring frame 10 . Finally, a further sensor 12 is provided on the motor or gear box 3, the pulse from the drive Bewegungsim i 3/5 of the ring frame 10 receives and passes to the controller PLC.

On the basis of the lines 30 , 31 , 32 , 33 transmitted to the PLC controls, parameters or impulses are continuously calculated for a frequency controller 24 for further processing, which controls the motor 5 with respect to start / stop, direction of rotation, speed, duty cycle. The frequency controller 24 is preferably a controllable inverter, which can reverse the rotating field, and the motor 5 is a synchronous motor. It has been shown that the fastest possible reversing movement of the ring frame is important for the winding of the cop. For this, on the one hand, the frictional resistances, as mentioned at the beginning, must be as low as possible, on the other hand, the aim is to allow a maximum of 20 ms to elapse from the time the engine starts braking until the subsequent acceleration after reversal of motion. This presupposes the use of a highly dynamic motor, the dynamic moment (in Nm) divided by the flywheel mass of the entire system reduced to the motor shaft, transmission elements, ring frame etc. (in kgm ² ) reaches a value of over 4000.

The invention is based on the knowledge that in the upper reversal point of the ring frame 10 no rapid delay before reaching the highest position, but in particular no rapid lowering is necessary because at this point no problems occur when rewinding the yarn from the cop to a package. Therefore, a return spring for the ring frame drive can be omitted, which pulls the ring frame 10 down. In contrast to the writings on the state of the art mentioned above, a non-inevitable guidance of the ring frame 10 , which is merely suspended from the tension elements 9 , is sufficient without these tension elements being held in a stretched state by additional measures. The drive power of the motor 5 for the ring frame drive can be kept at a comparatively low level compared to the examples mentioned. It is also possible to brake the ring frame quickly in the upper reverse position, where after the downward movement begins with low acceleration. Correspondingly, but in the opposite direction, the reversal of movement can be designed in the lower region, or the braking process before reaching the lowest position and the subsequent acceleration process each take place with relatively high acceleration.

It is important that the ring frame moves in or after top dead center is accelerated so slowly that no vibrations occur in the system. Ande on the other hand, the reversal of motion at bottom dead center must take place so quickly that during the subsequent rewinding process, none at the respective rewinding moment uninvolved thread layers on the cop are carried away.

It has been found that a dead time of 10. . . 20 ms is to be observed between the movements down and up, while in top dead center between the braking process and the subsequent acceleration down or a downtime of 30. . . 50 ms is permissible.

The following conditions apply to the movement laws of the ring frame for the respective reversal of movement:

• 1. Top dead center
  It is preferred to brake quickly and accelerate slowly, with a brake deceleration of 0.25. . .0.5 m / s ² and an acceleration of 0.1. . .0.2 m / s ² . Alternatively, you can brake more slowly.
• 2. Bottom dead center
  There is again a deceleration value of 0.25 for the braking process. . .0.5 m / s ² to increase, while for the acceleration at the start of the movement up again a value between 0.1. . .0.2 m / s ^{2 is} sufficient. At bottom dead center, however, braking and acceleration can also take place with the higher deceleration or acceleration values.

Reference list

1

Part frame

2nd

Part frame

3rd

transmission

4th

Timing belt

5

engine

6

Gear shaft

7

Output shaft

8th

Pulley

9

Tension element

10th

Ring frame

11

Redirection

12th

sensor

14 input device

16 donors

18 engine
19 drafting system
20 gears
21 donors
22 drafting cylinders

24 frequency controls
30 line
31 line
32 line
33 line
h stroke
i movement impulse
l delivery
PLC control

Claims (15)

1. A method for lifting and / or lowering thread-carrying parts, in particular re of a rail running in the longitudinal direction of a ring spinning machine or a ring frame ( 10 ), by means of tension elements ( 9 ), characterized in that in the alternating movement of the ring frame ( 10 ) top dead center is accelerated slowly, while bottom dead center brakes quickly, with an acceleration value between 0.1 and 0.2 m / s ² for slow acceleration and a deceleration value between 0.25 and 0.5 m / s ² for fast braking. 2. The method according to claim 1, characterized in that before reaching the above ren dead center is braked quickly to the same extent. 3. The method according to claim 1 or 2, characterized in that in the bottom dead center is accelerated slowly in the range of values mentioned, with an acceleration value between 0.1 and 0.2 m / s ² . 4. The method according to any one of the preceding claims, characterized in that slow braking is applied in the top dead center, in the mentioned value range between 0.1 and 0.2 m / s ² . 5. The method according to any one of the preceding claims, characterized in that is accelerated rapidly in bottom dead center in the range of values mentioned. 6. The method according to any one of claims 1 to 5, characterized in that in bottom dead center a dead time of 10.. .20 ms is observed between the Movements down and up while in top dead center between the braking process and the subsequent acceleration downwards a dead  time or downtime from 30.. .50 ms is permissible. 7. The device in particular for performing the method according to one of the preceding claims, with thread-guiding parts, in particular of a rail running in the longitudinal direction of a ring spinning frame or a Rin frame ( 10 ), by means of tension elements ( 9 ), characterized in that the thread-guiding parts are suspended on elements ( 9.1 , 9.2 , 9.3 ) without another device exerting a vertical force. 8. The device according to claim 7, characterized by tension elements ( 9 ) which are connected to a pulley ( 8 ) of a transmission ( 3 ), wherein the tension elements ( 9 ) circulate at least one deflection ( 11.1 , 11.2 ) and in sections in the horizon tal Longitudinal direction of the device or transverse to it. 9. The device according to claim 7 or 8 with a motor ( 5 ) which is connected via a gear ( 3 ) with tension elements ( 9 ) on the ring frame ( 10 ), characterized in that the motor ( 5 ) by a frequency controller ( 24 ) can be controlled, which is connected to a controller (PLC), which in turn is connected to sensors or transmitters ( 12 , 16 , 21 ) and an input device ( 14 ), with a processing unit of the controller (PLC) for determining target frequencies for the Frequency controller ( 24 ) depending on technological data from the input device ( 14 ) and from the parameters determined by the sensors or transmitters ( 12 , 16 , 21 ) - delivery l of the drafting device ( 19 ), stroke h of the ring frame ( 10 ) and movement impulses i of the drive ( 3 , 5 ) of the ring frame ( 10 ) - is designed. 10. The device according to claim 9, characterized in that the encoder ( 16 ) is an absolute encoder. 11. The device according to claim 9 or 10, characterized in that the motor ( 5 ) is assigned a brake. 12. Device according to one of claims 9 to 11, characterized in that the motor ( 5 ) is assigned a pulse generator ( 16 ). 13. Device according to one of claims 9 to 12, characterized in that the motor ( 5 ) with the transmission ( 3 ) via a toothed belt ( 4 ) is connected 14. Device according to one of claims 8 to 12, characterized in that a pulley ( 8 ) with tension elements ( 9 ) on an output shaft ( 7 ) of a worm gear ( 3 ) is seated. 15. Device according to one of the preceding claims 9 to 13, characterized in that the motor ( 5 ) is designed so that it has a time of 10 for the reversing. .20 ms is required, whereby the dynamic torque (in Nm) of the motor ( 5 ) divided by its own flywheel mass (in kgm ² ) is greater than 4000.