DE3235217A1 - Wire take-off device for intermittent operation and high degrees of nonuniformity - Google Patents

Abstract

The invention relates to a motor-driven wire take-off device which is equipped with two compensators and hence allows continuous unwinding from the wire coil despite high degrees of nonuniformity in the demand for wire by the following machine. The compensator devices are connected up to one another in such a way that one compensator only compensates the nonuniformity without exercising control, while, during this process, the second compensator remains inhibited. Only after a limit position is reached is this second compensator released and, in addition to further wire take-off, also brings about a control pulse which changes the continuous take-off speed of the drive. This double-compensator device can operate both with simple take-off drives and with calibrating wire-drawing machines connected in between.

Description

Description:

The invention relates to a wire withdrawal device which it allowed, even with high ring weights, intermittent operation and high degrees of irregularity with regard to the wire requirements of a downstream wire processing machine a practically continuous process from the reel and / or a continuous one To achieve calibration of the wire between the decoiler and the processing machine.

Pull-off devices with a single compensator arm are known, about its leadership role. the outgoing wire core is guided. When changing the The compensator arm changes its wire supply stored in the wire loop Position and controls a clutch in the end positions, which stops the pay-off reel or enables, but the drive continues to run constantly.

Sequence devices, e.g. in connection with a wire calibration machine, are also known, which controls the withdrawal or drawing speed via a compensator arm so that a mean feed rate is established.

This equipment has proven itself as far as the individual strokes of the intermittent Operation is relatively small and therefore the degree of irregularity is low. With draw-in lengths the downstream processing machine of approx.

The known take-off devices lead to 1000 mm or more per work cycle to difficulties because the control devices are not: sufficient, so that overloads at the infeed of the downstream machine or malfunctions on the wire bundle that is running out enter. Through the use of small bundle weights and temporary loop guides will try to counteract these difficulties.

The present invention aims at a technologically flawless one Solution to this problem by using two expansion joints. This prevents that even with extreme degrees of irregularity no over-inflation can occur and enables continuous operation of the take-off gear.

Using the example of a wire pull-off device with an interposed Calibrating machine, which here acts as a fume cupboard heater, becomes the effect and that Principle of the newly developed double compensator arrangement that has been registered for protection explained.

The raw wire (1) running off a pay-off reel is in the drawing die (2) calibrated and wound in a known manner on a drawing drum (3), wherein several turns on the drum by frictional engagement transmit the pulling force.

The calibrated wire (1) is then over the guide roller (4) of the compensator arm (5) and then passed over the guide roller (6) of the compensator (7). From there it runs in a free loop to the feed rollers (8) of the downstream wire forming machine.

Stop when the machine is ready to be switched on but not yet running both expansion joints in their outer, i.e. right and left end positions, whereby the Compensator (7) blocked by suitable means, e.g. spring or electromagnetic clutch and is thus rendered ineffective. The full wire supply is in this basic position stored in the two compensators. Suitable command transmitters (9) and (1o), e.g. Limit switches or initiators ensure that the machine does not start because there is no Wire is removed from the downstream machine. As soon as the downstream machine starts up and requests wire, this is released from the supply, whereby the compensator (5) moves towards the pulling drum (3), thereby the command transmitter (9) activated and the calibration machine starts up. The compensator (7) remains while still in a blocked outer position. If the wire supply decreases so far that the command transmitter (11) is activated, the blocking of the compensator (7) canceled, so that it can move towards the pulling drum while releasing wire and at the same time gives a control pulse to the control loop, i.e. a slightly higher one Pulling speed caused.

This speed correction means a better adaptation to the amount of wire actually required. After the end of a feed interval, it increases the wire supply closes again, the command transmitter (11) causes the new blocking of the compensator (7) in the new position.

As soon as the compensating compensator (5) reaches its outer end position again hat1, the blocking of the compensator (7) is lifted and it can now run back to its outer end position. As soon as this is reached, it switches the calibration machine. In practical continuous operation, however, this will only be the case take place when the downstream wire processing machine is switched off will. Normally, a control process is only triggered when the requested The amount of wire changes or until the machine is in the optimal range Has. As long as the wire output is between the command transmitters (9) and (11) of the compensator (5) plays, no regulation takes place and the compensator (7) remains blocked. the Command transmitters (12) and (13) operate in the inner limit positions of the expansion joints an "emergency stop" shutdown if any faults, e.g. faults in the wire supply, enter.

The calibration drawing machine mentioned in the preceding statements can can also be replaced by a regulated roller output with or without straightening, both the feed rollers (8) of the wire processing machine being relieved as the use of very heavy ring weights is also made possible.

The principle of a wire pull-off device in connection with a calibration wire drawing machine is shown in Figure 1.

Figure 2 shows the basic circuit diagram and the individual phases of the circuit processes within a work cycle, in particular the principle of the control compensator (7) becomes clear.

Phase a shows the switch position when the machine is ready to be switched on not running yet. Compensator (7) is blocked via (9, 10) and via (11).

Phase b shows the switch position of the started machine, which from Command transmitter (9) has been triggered. Compensator (7) remains blocked.

Phase c shows the switch position when the wire supply is used up Compensator memory (5). The blocking of the compensator (7) is done by commanders (11) repealed.

Phase d shows the switch position when the wire is dispensed from the memory Compensator (7), the blocking is further lifted.

Phase e) shows the switch position after the draw-in has ended.

The wire supply increases again. Command transmitter (11) causes blocking of the compensator (7) in the new position.

Phase f) shows the switch position be full memory of the compensator (5). The blocking of the compensator (7) is via the command transmitters (9) and 10) canceled. Compensator (7) can also run back into the outer end position.

Phase g) shows the switch position when the storage tanks are fully filled both expansion joints. Compensator (7) is locked in its basic position again . The machine switches off via the command transmitters (9) and (10). This position corresponds to the basic position a) when ready to switch on.

Claims (4)

Wire pull-off device for intermittent operation and high degrees of irregularity. Claims: wire pull-off device for intermittent operation, characterized in that the controllable drive unit to compensate for high degrees of deformation is equipped with a double compensator. 2) wire pull-off device according to claim 1), characterized in that that one of the compensators compensates for the unequal wire requirements of the following machine creates and the other compensator regulates the average continuous take-off speed causes. 3) wire pull-off device according to claims 1) and 2), characterized in that that the compensation compensator has limit switches, initiators or the like Pulse generator causes a blocking or release of the control compensator and thus counteracts an overdrive of the system. 4) wire pull-off device according to claim 1) to 3), characterized in that that the blocking of the control compensator mechanically and the release by means of a electrical, pneumatic or hydraulic power element takes place.