MXPA00006811A - Driver system for reducing the speed of or dragging metal strips - Google Patents

Abstract

An elastic coating (12) that can be adapted by means of shaping and filler pieces (31, 32) is provided in order to expand the useful scope of a driver system in a device for pulling or reducing the speed of metal strips (4) or sheets and comprising endlessly circulating chain systems, in addition to being able to adapt input, output and drive status to specific tasks.

Description

IMPULSION SYSTEM TO REDUCE THE SPEED OR DRIVE OF METALLIC STRIPS TECHNICAL FIELD The invention relates to drive systems in a device for pulling or braking metal strips or sheets, preferably in strip lines between continuously rotating chain systems.

PREVIOUS TECHNIQUE EP-A-0088347 and EP-A-0195096 describe a braking station for metal and laminated strips with which the traction or braking force required during braking of the metal strips can be applied to the surface of the braid. band divided or not divided without harmful effects. The use of the effect of swirling currents for braking an electrically conductive metal strip is described in DE-B-1, 288, 265. This embodiment is used in practice. The fundamental disadvantage consists in the fact that the desired function does not appear to be useful until a band speed of approximately 50 m / min is reached. The tension of the band could only be controlled by a change in the spacing. The result was unsatisfactory, since, at too short a spacing, contact with the magnet caused relative movements. An additional eddy current brake is described in published specification DE-195, 24, 289, Al. The essential difference consists in the fact that the permanent magnets move in a circular route. Only one magnetic path is available for the retention effect. In addition, the parallelism of the permanent magnets appears only during a fraction of the period, as a result of which the retention effect accumulates in a non-uniform and substantially reduced manner. In order to allow sufficient specific tension to be applied in the band, the rotational speeds of the braking rollers would have to be placed in orders of magnitude which are not controllable for a long time. In addition, high drive outputs are presented at a very unfavorable efficiency.

DESCRIPTION OF THE INVENTION The fundamental problem of the invention is to extend the possible uses of the known braking station, on the one hand, and achieve a specific behavior that is different for the various tasks, on the other hand, in particular for the input, output and drive conditions of carriage-type roller blocks in the region of belt drive. This problem is solved according to the characteristics of the main claim by training, which produces a strong support in the central region. The entrance and exit must be of elastic configuration. The design is such that high elasticity is achieved in the horizontal direction (direction of web tension). In addition, an imperceptible tightening with the invention is achieved, as a result of which the work of bending at the entrance and exit can be reduced decisively. The width of the lining corresponds to the separation of the chain. The arrangement is made between the running rolls. It is possible with this design to provide a closed contact surface in the drive region. This design requires the synchronous running of the upper trolley-chain in relation to the trolley-chain of the bottom. Preferably, a low liner hardness is selected with a relatively thick liner. The metal band is fitted, so that the errors of shape of the metal band in the cross section and the undulation of the band are compensated without problems. The separation spaces created allow the tight volume of the elastic liner to flow in a specific manner. The liner is given as a filler piece, e.g., flat bar steel. This allows the tightening to be adapted in a specific manner to the functional task by means of the stress concentration factor, while the desired inclination of the lining in the tension direction can be effected in a virtually unrestricted manner. An appropriate application [sic] consists in the fact that only a rotating cart-chain is designed as a turntable. In this case, forces are induced in the band by means of permanent magnets or via electromagnets in order to allow braking or traction forces to be applied. The magnetizable metal strip is pulled by the attractive forces on the chain-drive protective belt and the driving forces are produced in accordance with the μ-value. As an additional possibility it is suitable that the two rotating rollers are equipped with permanent magnets or with electromagnets and that a magnetic field of travel is built, linear, parallel, by the magnet poles applied, this field of magnetic travel acting as a brake of swirling, rotating, linear currents in the electrically conductive strip material. The metal band is heated if the energy is supplied conductively or inductively via the rotating system. This effect can also be used in galvanic or other processes. If the rotating system is equipped with electronic measuring heads, the thickness of the band, the condition of the surface, the metal structures and the like, for example, can be tested very accurately since the metal band and the test head they can work in a fixed position for a certain period at identical speed. An optimal mode of operation is achieved if the linear, mechanical drive unit is operated by a linear, electric drive unit. This mode loads the chain-carriage system only in the linear drive region and is therefore particularly suitable for high forces and high speeds. If the braking station is placed in position in a control frame at a height of the line of passage, extremely precise control of the band with respect to the center of the band or edge of the band becomes possible, since the Tilt movement is "designed" by this measure. As a result, fluctuations in tension due to vibrations are avoided. This is an important aspect for the rolling, elongation, bending and alignment processes. The braking station or the control frame can be extended by a measuring frame of the web tension. In this case, these units hang on leaf springs. The reaction forces of the web tension are recorded without distortion via measurement cells. This measuring system is able to measure exclusively the horizontal forces with a high respective accuracy and depending on the measurement interval, they can be adjusted to a few newtons. For high demands, for example in the case of bands with a very high surface sensitivity, such as a copper or aluminum band, special effects become possible according to the invention, to be precise due to the specific feeding of the chains having the roller blocks in a relatively short drive and holding region by means of straight, guide strips, which at the same time allow the clamping forces to be absorbed. In this way, relatively large pressure forces can be absorbed, these pressure forces being necessary in order to measure large retaining or pulling forces without relative movement between the belt and the rotating carriage-type roller blocks. The specific feeding of the roller blocks is achieved by the inlet and outlet curves in the straight guide strips of the drive region. A highly elastic transition is made possible by the specific formation. The tightening of the elastic lining is specifically reduced by the insertion of the formed plates. The design of the electric linear drive unit has the advantage that the hinge ends of the chain-link articulation plates are only loaded by the deflection and centrifugal forces, while the loads of the belt tension that they are applied only act in the driving region. The sizing of the hinges can therefore be restricted to the deflection and centrifugal forces. This reduces wear to a minimum. The drive section can be configured in such a way that the current is fed to the metal strip conductively or inductively. This solution is used preferentially in galvanic processes, when the band is heated, for measurement processes in the band and for accumulation of magnetic fields, which are used to induce retention forces. For the supply of the current, the electrically conductive materials are placed in the carriage-type roller blocks. The current can be switched on specifically when the roller blocks pass through the drive region. Apart from better efficiency compared to the installations of annealing furnaces fueled by gas or oil, a great advantage of this measure is the fact that the power supply can be removed at any time. When the eddy current method is used, the tension of the band can be controlled by the opposite speed of the chain cars, and the holding force can be controlled by varying the frequency. If the lining carriers of the trolley system are equipped with measuring probes, ideal analysis conditions are provided by the turntable. The task of the rotary carriage-chain system is to transport the belt and ensure a fixed belt distance from the measuring heads or magnet spirals. The residence time for the test operation can be adjusted by establishing the contact section, since the metal band and the chain-car system have the same speed in this region. The application is suitable for band thickness measurements, band voltage measurements, surface scanning and other test systems. The current can alternatively be fed from the inside or laterally from the outside. The current turns on and off after the chain-carriage has reached the parallel section or before it leaves the parallel section. Individual magnets or magnet spirals, which pass over the complete or segmented section, can be supplied with voltage according to the same system. The band pulls on the chain-car via magnetic forces of attraction. The tension of the band can be applied via chain-car systems as a function of these forces and by the μ-value. This is also possible by means of permanent magnets. This design is suitable for magnetizable metal bands.

BRIEF DESCRIPTION OF THE DRAWINGS The invention is explained in more detail below with reference to the exemplary embodiments shown in the drawings, in which: Figure 1 shows a braking station of divided bands; Figure 2 shows the front view of a braking station with the control and measurement frames, partially sectioned; Figure 3 shows the side view of a braking station with the control and measurement frames, partially sectioned; Figures 4 and 5 show a possible elastic lining under different load states; Figure 6 shows the direct voltage and inverted by the eddy currents fields; and Figure 7 shows the direct voltage and inverted by magnetic fields.

WAYS TO IMPLEMENT THE INVENTION The arrangement shown has the great advantage that the individual band strips can be fed tangentially to the winding reel 1, 2 without a diverting wheel. The inverted voltage accumulated in the braking station 5, 6 is put to the intake point without loss of deviation and without relative movements. In this way, ideal pre-conditions are created for a uniform distribution of the band tension. The tangential feed is adjusted continuously. The number 1 shows the mandrel of the winding reel, 2 shows the wound spiral, 3 shows the third separation for the band strips, 4 shows the metal band, 5 shows the upper rotating roller, 6 shows the rotating roller of the bottom, shows the second separation and 8 shows the first separation, in order to feed the metal band to the braking station at right angles from a circuit 9, and 10 shows the division shears. The special feature of this solution according to Figure 2 consists in the fact that the linear, mechanical drive unit is moved by a linear, electric drive unit 19. This solution allows a high band tension to be induced in the metal band in a faster manner. During deviations, only the forces of the centrifugal forces and the hinge movements originate for the chaincar. The chain carriage 11 can be of simple configuration. The complete drive chain consists of a tree with cogwheels, universal shaft, gear unit, clutch and electric motor. Substantially high speeds with a high band voltage at the same time can be covered without problem. The number 12 shows the segmented lining, elastic, 13 shows the lining carrier, 14 shows the run rail. The braking station 20 hangs by means of leaf springs 24 in the control frame 21. The tension of the band can be measured with a very low hysteresis and very high respective accuracy by means of the weighing cells 23 without distortion by the deviations. The braking and tensioning station 20 consists of vertical and rotating rollers 5 and 6, which are arranged opposite each other and are adjusted in the guides 18 of the uprights 20 and of which the upper rotary roller 5 is adjusted against the rotary roller of bottom 6 by means of piston rods 18 pressurized with cylinder. The chains 11 and 11 are composed of a multiplicity of carriage-type roller blocks, which are coupled to each other, extend over the full width of a band 4 entering in the direction of the arrow 25 and with the support wheels. 26, at least on both sides, and side guide rollers 27, roll on a track or are in lateral contact with the latter. The track is run to a drive region, in which the opposed roller blocks 11 are grasped by the band 4 on both sides and clamped together. The liner carriers 13 are provided with an elastic liner 12. The width of the liner corresponds to the spacing T of the chain and extends within the axes of the support wheel 26 of two adjacent, ie successive, blocks. The axes at the same time form a defined center of rotation. The liner 12 is formed by spacing 30 in such a way that a particularly elastic adaptation of the tight lining on the inlet and outlet side is possible. The tightening height of the lining should be as low as possible in order to keep the bending work as light as possible. At the same time, the liner should be given very high elasticity in the direction of web tension in order to allow different web speeds for the individual strip strips via the different liner inclination, as shown in Figure 6. This functional variance has been achieved according to the invention so that the tightening height can be adapted to the task via the stress concentration factor by means of the support plates 31 and 32, but the lining inclination is only restricted to an imperceptible degree. Figure 4 shows the position of the lining with a light band tension, and Figure 5 shows the position of the lining with a high band tension. If the liner carriers 13 are equipped with permanent magnets 33 or magnet coils 34, which accumulate eddy current fields, the electrically conductive strips, in particular aluminum, copper bands and their alloys, can be used to induce the voltage of the conductor. band.

In this case, the chain carriage, as a rule, moves against the running direction of the belt. The length of the contact section can be adapted to the requirements. This embodiment according to Figure 6 is of great interest for metal bands that have higher surface demands, since there is no contact with the braking system. The system between the permanent magnets 33 or spirals 34 can be kept constant by the supports of the rotating rollers which are adjusted by the elastic blocks 35. The metal band 4 levitates between the permanent magnets 33 or the spirals 34 due to the forces of attraction . The protective belt 36 is also shown. If the cylinders 18 are replaced by spindle drive units, the distance can be adjusted and the machine is thus given an additional control element. If the liner carriers 13 are equipped with permanent magnets 33 or magnet coils 34 which accumulate magnetic fields, the magnetizable metal bands can be used to induce web tension. In this case, the chain carriage moves in the running direction of the belt. The length of the contact section can be adapted to the requirements. This mode is of great interest for metal bands that have high surface demands, since there is contact with the braking system only on one side.

Claims (15)

1. CLAIMS 1. Device for pulling or braking metal bands or sheets, in particular for a plurality of narrow bands, with a separate braking action band by band, preferably in band lines between continuously rotating, fastening chain systems, or drive, the belt or sheet with carriage-type roller blocks, characterized by an elastic lining that is specifically adapted by forming and filling pieces. The device according to claim 1, characterized by a closed liner in the contact region. The device according to claim 1 or 2, characterized by the bonding of magnet coils to the roller blocks. The device according to one of claims 1 to 3, characterized by the attachment of permanent magnets to the roller blocks. The device according to one of claims 1 to 4, characterized by measurements of flat or equal surface in the traveling band. The device according to one of claims 1 to 5, characterized by elements for measuring the flat or equal surface in the elastic lining 7. The device according to one of claims 1 to 5, characterized in that the measuring elements of flatness or surface equality in the rotating roller blocks 8. The device according to one of claims 1 to 7, characterized by the drive unit of the braking station by means of a linear, electric motor. one of claims 1 to 8, characterized by the pivoting of the braking station, so that the band is fed tangentially to the spiral 10. The device according to one of claims 1 to 9, characterized by a floating braking station in a measuring frame, so that the reaction forces are absorbed horizontally and determined by means of weighing cells. according to one of claims 1 to 10, characterized by a control frame at the height of the passage line of the braking station, so that the tilting movement is eliminated. The device according to one of claims 1 to 11, characterized by the linear band voltage by means of a system of swirling currents. The device according to claim 12, characterized by the linear band tension produced by the movement against the belt direction of the belt. 14. The device according to one of claims 1 to 11, characterized by the linear band voltage by means of magnetic forces. 15. The device according to one of claims 1 to 14, characterized by the arrangement of bending stations and web grinding devices between the turning stations.