DE19717507A1 - Fibre guide raising and lowering device eliminating unfavourable frictional resistance - Google Patents

Abstract

The device is used for raising and-or lowering fibre guides. It is used especially with a longitudinal rail or ring frame (10) of a ring spinning machine. The device has a number of traction elements (9). These traction elements may lead directly tangentially to the frame pulley (8) in the longitudinal direction.

Description

The invention relates to a device for lifting and / or Lowering thread-guiding parts, especially one extending in the longitudinal direction of a ring spinning machine Rail or a ring frame, by means of tension elements, the are connected to a transmission pulley, wherein the tension elements circulate at least one deflection and in places in the horizontal longitudinal direction of the Device are performed.

DE-OS 43 43 966 is a drive device, for example for a ring bench of a ring spinning or twisting machine knows which at least one, the ring bench via tension members has driving drive roller, which has a min at least one spur gear stage and one worm gear stage stationary reduction gear with a drive motor connected is. The tension elements are over several um steering rollers led to this drive roller, so that  Frictional resistance of the gear and motor pulleys burden additionally.

The same applies to DE-OS 43 37 102, in which the Tension elements just before the pulley one more turn experience.

The present invention is based, un to avoid favorable frictional resistance.

To solve this problem leads that the tension elements in the longitudinal direction directly tangent to the pulley are led.

This means that the tension elements have so few deflections experienced as possible.

In another embodiment of the invention provided that the motor from a frequency controller is controlled. This is on a controller connected, which in turn with appropriately designed Sensors or sensors and an input device connected is. A computing unit is determined in the control Target frequencies for the frequency controller, depending on of technological data from the input device and from the parameters determined by the sensors or sensors. To These parameters count above all the delivery, the means the delivery quantity of the drafting system, the stroke of the Ring frame and the movement impulses of the drive for the Ring frame.

The one sensor or encoder, which the stroke of the ring frame determined, should preferably be designed as an absolute encoder be. He is thus able to change the position of the Ring frame absolutely indicate, which means that for example in the event of a malfunction (power failure) actual ring frame position is not lost.  

Furthermore, the motor for driving the ring frame stroke be provided with a brake. This brake acts ahead especially if, for example, in the event of a power failure Tried to lower the ring frame. This lowering works apply the brake. In the event of a power failure, it can block the motor shaft, for example. With normal The drive comes to a standstill by boosting the frequency put down.

The engine is supposed to have a positive fit with the gearbox Drive element, preferably connected via a toothed belt be.

It is also provided in the context of the invention as a motor a liquid-cooled for lifting the ring frame To provide synchronous motor. That means the engine is on a cooling circuit is connected and from one Coolant is flowed through. Such engines can also be found for other drives in spinning machines.

The ring frame should preferably not be raised linearly but in the pilgrim step process. That means, that the motor is reversed several times got to. Reversing a motor will Decelerate the engine, its reversing and again accelerate understood. This must be done as quickly as possible happen. This ring frame drive also serves variable, programmable "winches / underwinds" on the Head construction. This also means very fast motor movements over long distances (according to sleeve length). With an engine who fulfills these demands must be one act highly dynamic engine.

The invention is based on a in the drawing voltage illustrated embodiment explained in more detail. This drawing shows in

Fig. 1 shows a schematically illustrated section of egg ner ring spinning machine with an embodiment of the invention;

Fig. 2 is a circuit diagram for driving a motor, which is connected upstream of a transmission;

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 , which is connected to a motor 5 via a V-belt 4 . The V-belt 4 wraps around corresponding pulleys and drives a gear shaft 6 during operation of the motor 5 . 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. The tension elements 9.1 to 9.3 loop around the deflection 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 . A design as an eccentric is also possible for the pulley 8 in order to compensate 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 obliquely upward 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 1 of a drafting system. During the delivery quantity 11 , the stroke increases linearly, for example, from the value h ₁ to h ₂ , there being no stroke displacement Δh / Δl. 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 , l1, .DELTA.h / .DELTA.l, which are passed to the control system PLC together with other technological data via an input device 14 , are processed by algorithms in a computing unit of a control system from 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 at the engine 5 or the transmission 3, the movement of the drive pulses i 3/5 of the ring frame 10 receives and passes to the controller PLC.

On the basis of the parameters or pulses transmitted to the controls PLC via lines 30 , 31 , 32 , 33 , variable target frequencies 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, switch-on duration. 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 msec to elapse from the time the engine starts braking until the subsequent acceleration after reversing the movement. This requires the use of a highly dynamic motor, the dynamic moment (in Nm) divided by the flywheel mass of the entire system motor, transmission elements, ring frame etc. (in kgm ² ) reduced to the motor shaft reaches a value of over 4000.

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

giver

18th

engine

19th

Drafting system

20th

transmission

21

giver

22

Drafting cylinder

24th

Frequency controller

30th

management

31

management

32

management

33

management
h stroke
i movement impulse
l delivery
PLC control

Claims (9)

1. Device for lifting and / or lowering of thread-guiding parts, in particular of a rail or ring frame ( 10 ) running in the longitudinal direction of a ring spinning machine, by means of tension elements ( 9 ) which are connected to a belt pulley ( 8 ) of a transmission ( 3 ) , wherein the tension elements ( 9 ) run around at least one deflection ( 11.1 , 11.2 ) and are partially guided in the horizontal longitudinal direction of the device, characterized in that the tension elements ( 8 ) are guided tangentially in the longitudinal direction on the pulley ( 8 ). 2. Device according to claim 1, characterized in that the pulley ( 8 ) on an output shaft ( 7 ) of a worm gear ( 3 ) is seated. 3. Device for lifting and / or lowering thread-guiding parts, in particular a ring frame ( 10 ) of a ring spinning machine, in particular according to one of the preceding claims, with a motor ( 5 ) via a gear ( 3 ) with tension elements ( 9 ) on the ring frame ( 10 ) is connected, characterized in that the motor ( 5 ) can be controlled by a frequency controller ( 24 ) which is connected to a controller (PLC), which in turn is connected to sensors or sensors ( 12 , 16 , 21 ) and a Input device ( 14 ) is connected, a computer unit of the control (PLC) for determining target frequencies for the frequency adjuster ( 24 ) depending on technological data from the input device ( 14 ) and from the sensors or transmitters ( 12 , 16 , 21 ) determined parameters delivery 1 of the drafting system ( 19 ), stroke h of the ring frame ( 10 ) and movement impulses i of the drive ( 3 , 5 ) of the ring frame ( 10 ). 4. The device according to claim 3, characterized in that the encoder ( 16 ) is an absolute encoder. 5. Apparatus according to claim 3 or 4, characterized in that the motor ( 5 ) is assigned a brake. 6. Device according to one of the preceding claims, characterized in that the motor ( 5 ) is assigned a pulse generator. 7. Device according to one of claims 3 to 5, characterized in that the motor ( 5 ) with the transmission ( 3 ) via a toothed belt ( 4 ) is connected. 8. Device according to one of claims 3 to 7, characterized in that the motor ( 5 ) is a liquid-cooled synchronous motor. 9. Device for lifting and / or lowering thread-guiding parts, in particular of a rail running in the longitudinal direction of a ring spinning machine or a ring frame ( 10 ), by means of tension elements ( 9 ) which are connected to a pulley ( 8 ) of a transmission ( 3 ) , wherein the tension elements ( 9 ) run around at least one deflection ( 11.1 , 11.2 ) and are guided in sections in the horizontal longitudinal direction of the device, the ring frame ( 10 ) being able to be raised by reversing the motor ( 5 ) using the pilgrim step method, and the motor ( 5 ) is designed in such a way that it takes about 20 msec for reversing, the dynamic torque (in Nm) of the motor ( 5 ) divided by its own flywheel mass (in kgm ² ) being greater than 4000.