KR20010034032A - Driver system for reducing the speed of or dragging metal strips - Google Patents

Abstract

In order to extend the effective range of the drive system in a device for drawing or reducing the speed of the metal band or sheet 4, including an endless chain system, and to adapt the introduction, discharge and drive states to specific tasks, shaping and An elastic lining 12 is provided that can be adapted by the filling parts 31, 32.

Description

DRIVER SYSTEM FOR REDUCING THE SPEED OF OR DRAGGING METAL STRIPS}

EP-A-0088347 and EP-A-0195096 disclose metal or sheet, which can provide the tensile or braking force required during braking of the metal band to the surface of the split or undivided band without damage. Disclosed is a band breaking stand.

The use of the vortex effect for the braking of electrically conductive metal bands is disclosed in DE-B 1 288 865. This embodiment is actually used. An important drawback is that certain functions are only given when the band speed reaches about 50 m / min. In addition, the band tension adjustment is made only by the variation of the interval. However, the result is not satisfactory because the contact with the magnet causes relative motion when the distance is too small.

Another vortex brake is disclosed in DE 195 24 289 A1. The important difference is that the permanent magnet is moved in a circular path. Only one magnetic path is used for the retention effect. In addition, the parallelism of the permanent magnets occurs only during part of the cycle. As a result, the retention effect is formed in a nonuniform and significantly reduced manner. In order to provide sufficient specific band tension, the rotational speed of the braking rollers should be of a size that can no longer be controlled. In addition, high drive outputs appear at very undesirable efficiencies.

The present invention relates to a drive system of a drawing or breaking device of a metal band or sheet in a band line between endless rotating chain systems.

1 is a cross-sectional view showing a split band breaking stand.

2 is a front view of a breaking stand with a control and measurement frame.

3 is a side view of a breaking stand with a control and measurement frame.

4 and 5 are cross-sectional views of elastic linings possible under different loading conditions.

6 is a sectional view showing forward and reverse tension by the vortex field;

7 is a cross-sectional view showing the forward and reverse tension by the magnetic field.

The object of the present invention is to broaden the possibility of the use of known braking stands on the one hand, and on the other hand to obtain different specific characteristics for different challenges in the introduction, discharge and driving conditions of carriage-type roller blocks, especially in the band drive area. will be.

This object is achieved by shaping with strong support in the central area according to the features of the independent claim. The introduction and discharge should be elastically constructed. The design is such that high elasticity is obtained in the horizontal direction (band tension direction). In addition, since low squeegeeing is achieved by the present invention, flexing can be significantly reduced at the inlet and outlet. The lining width corresponds to the chain pitch. The arrangement is made between the traveling rollers. By this design it is possible to provide a sealing contact surface in the drive area. This design requires synchronous running of the upper carriage chain to the lower carriage chain.

If the lining is relatively thick, a low lining hardness is preferred. By embedding the metal band, the shape error and the band waveform of the metal band in the cross section are compensated without problems. The formed gap space allows the squeezed volume of the elastic lining to flow in a certain way.

Filling parts, such as flat bars, are provided in the lining. In this way, squeegeeing can be adapted in a particular way to the functional task by the stress concentration factor, while a predetermined inclination of the lining in the tension direction can be given almost without limitation.

A suitable application is that only one rotary carriage chain is formed of a rotary table. In this case, the force is introduced into the band by a permanent magnet or electromagnet to provide braking or tensile force. The magnetizable metal band is pulled by the tension onto the protective strap of the carriage chain and the driving force is generated according to the value of μ.

Another possibility is that two rotating rollers are equipped with permanent magnets or electromagnets, and by means of a magnetic pole a parallel, magnetically moving field is formed, said magnetically moving field as a linear, rotary vortex brake in an electrically conductive band material. It is appropriate to work.

When energy is supplied conductively or inductively through the rotating system, the metal band is heated. This effect can also be used in galvanic processes or other processes.

When an electronic measuring head is mounted on a rotating system, for example, the band thickness, surface conditions, metal structure, etc. can be tested very accurately, because the metal band and the test head can be operated at a fixed position at the same speed for a certain time. Because there is.

When the mechanical linear drive is operated by an electric linear drive, the best mode of operation is given. This embodiment is particularly suitable for high forces and high speeds, since it only loads the carriage chain system in the linear drive region.

When the braking stand is placed on the control frame at the pass line height, extremely precise control of the band in relation to the center of the band or the band edges is possible, because the tilting moment is not "designed" by this measure. to be. For this reason, the tension fluctuation by vibration is avoided. This is important for rolling, stretching, bending and lightening processes.

The breaking stand or control frame can be extended by the band tension measuring frame. In this case, the units hang on the leaf springs. The reaction force of the band tension is detected without distortion through the weighting cell. The measurement system can measure only horizontal forces with high repeatability and can be set to several Newtons depending on the measurement range.

By the present invention, special effects can be given to the high demands on bands with very high surface ambiguities such as copper or aluminum bands. In more detail, a special effect can be given by the special supply of the chain with the roller block into the relatively short clamping and drive area by means of a straight guide strip which allows the absorption of the clamping force at the same time. This allows the relatively large pressures necessary to ensure a large tension or holding force to be absorbed without the relative movement between the band and the rotational, carriage-type roller block. The special supply of the roller block is made by the introduction and discharge curves in the straight guide strip of the drive area. High elastic transitions are made possible by special shaping. Squeegeeing of the elastic lining is reduced by the insertion of the forming plate.

The design of the electro linear drive has the advantage that the hinge end of the chain carriage link plate is loaded only by deflection and centrifugal forces, while the load from the applied band tension acts only in the driving region. Therefore, the dimensional setting of the hinge can be limited to the deflection force and the centrifugal force. Due to this, wear is minimized.

The drive section may be formed such that current is supplied conductively or inductively to the metal band. This solution is preferably used for the formation of a magnetic field used in the galvanic process, in the heating of the band, in the measurement process in the band, and for induction of retention. For the current supply, an electrically conductive material is inserted into the carriage-type roller block. When the roller block passes through the drive region, the current can be switched. Besides the good efficiency compared to conventional gas or oil fired annealing furnaces, a great advantage of this measure is that the energy supply can be cut off at any time. When the vortex method is used, the band tension is controlled by the opposite speed of the chain carriage, and the holding force can be adjusted by the variation of the frequency.

When the measuring probe is mounted on the lining carrier of the carriage chain system, ideal evaluation conditions are given by the rotary table. The challenge of the rotary carriage chain system is to support the band and to ensure a fixed band spacing for the measuring head or magnetic coil. The duration of the test operation can be set by the definition of the contact section because the metal band and the carriage chain system have the same speed in this area. The application is suitable for band thickness measurement, band stress measurement, surface scanning and other test systems. The current can optionally be supplied laterally from the inside or from the outside. After the chain carriage reaches the parallel section or before it leaves the parallel section, the current is switched on or off.

According to the same system, voltage may be supplied to individual magnets or magnetic coils across the entire segment area. The band is pulled onto the chain carriage by magnetic traction. Band tension can be provided through the chain carriage system as a function of the force and μ value. This is also possible with permanent magnets. This embodiment is also suitable for a magnetizable metal band.

Hereinafter, the embodiment shown in the accompanying drawings will be described in detail.

The device shown has the advantage that the individual band strips can be fed tangentially to the winding reels 1, 2 without deflection sieve. The reverse tensions formed in the braking stands 5, 6 are transmitted to the take-up point without deflection losses and relative movement. This gives an ideal prerequisite for a uniform specific band tension distribution. Tangential feed is continuously regulated. 1 denotes a winding mandrel of a winding reel, 2 denotes a wound coil, 3 denotes a third separation of the band strip, 4 denotes a metal band, 5 denotes an upper rotating roller, 6 denotes a lower rotating roller, 7 denotes a second separator, 8 denotes a first separator for supplying a metal band to the braking stand at right angles from the loop 9, and 10 denotes a splitter ( splitting shears).

A special feature of the solution according to FIG. 2 is that the mechanical linear drive is moved by the electric linear drive 19. By this solution, a large band tension can be introduced into the metal band in the fastest way. During deflection, only the force resulting from the centrifugal force and the hinge movement occurs in the carriage chain. The carriage chain 11 can simply be constructed. The entire drive chain consists of a shaft with a sprocket, a universal shaft, a gear unit, a clutch and an electric motor. Very high speeds can be given without problems with high band tension. Reference numeral 12 denotes an elastic segment lining, reference numeral 13 denotes a lining carrier, and reference numeral 14 denotes an operation rail.

The braking stand 20 is suspended from the control frame 21 by the leaf springs 24. Band tension can be measured by the weighting cell 23 with very low hysteresis and very high repeat accuracy without distortion due to deflection. The braking and tension stand 20 consists of uprights and rotating rollers 5, 6. The rollers 5, 6 are arranged opposite each other and are inserted into the guide 18 of the stand 20. The upper rotary roller 5 is set relative to the lower rotary roller 6 by a cylinder pressurized piston rod 18.

The chains 11 and 11a consist of a plurality of carriage-type roller blocks joined to each other. The roller block extends over the entire width of the band 4 in the direction of the arrow 25 and is rolled on the track with at least the support wheels 26 on both sides, and the side guide rollers 27 and laterally contacted with the latter. The track extends into the drive area, in which the opposite roller block 11 catches both sides of the band 4 and fastens it between them.

An elastic lining 12 is provided on the lining carrier 13. The lining width corresponds to the chain pitch T and extends in the axle of the support wheels 26 of two adjacent, ie continuous blocks. The axles simultaneously define a defined center of rotation. The lining 12 is formed into the clearance space 30 so that the elastic adaptation of the squeezed lining can be made in the inlet and outlet sides. The squeegee height of the lining should be as low as possible for as little flexing work as possible. At the same time, the lining must have very high elasticity in the band tension direction to allow different band velocities of the individual split band strips through different slopes of the lining as shown in FIG. 6. This functional inconsistency is solved by the squeegeeing height being adapted to the task via the stress concentration factor by the support plates 31, 32 according to the invention, but only limited to a negligible inclination of the lining. Figure 4 shows the position of the lining when the band tension is small, Figure 5 shows the position of the lining when the band tension is high.

When the permanent magnet 33 or the magnetic coil 34 forming the vortex field is mounted to the lining carrier 13, an electrically conductive band, in particular a band made of aluminum, copper and alloys thereof, can be used for the introduction of band tension. . In this case, the carriage chain is generally moved opposite to the band running direction. The length of the contact section can be adapted as needed.

The embodiment according to FIG. 6 is particularly important for metal bands which give very high surface requirements since no contact is made with the braking system. The spacing between the permanent magnet 33 or the coil 34 can be kept constant by the support of the rotating roller set by the elastic block 35. The metal band 4 is moved between the permanent magnet 33 or the coil 34 by the traction force. Also shown is a protective strap 36. If the cylinder 18 is replaced by a spindle drive, the gap can be set so that the machine has additional control members.

When a permanent magnet 33 or magnetic coil 34 forming a magnetic field is mounted to the lining carrier 13, a magnetizable metal band can be used for the introduction of band tension. In this case, the carriage chain is moved in the band running direction. The length of the contact section can be adapted as needed.

This embodiment is particularly important for metal bands where the highest surface requirements are given because only one side is in contact with the braking system.

Claims (15)

A plurality of bands with a metal band or sheet, in particular a separate braking action per band, in the band line between the endless rotating chain system 26, 27 which fastens or drives the band with the carriage-type roller block 11 or the sheet 4. In a narrow band drawing or breaking device, Apparatus characterized in that an elastic lining is provided that can be adapted by shaping or filling parts. The device of claim 1 wherein a closed lining is provided in the contact area. Apparatus according to claim 1 or 2, characterized in that the magnetic coil is mounted on the roller block (11). Apparatus according to any of the preceding claims, characterized in that the permanent magnet (33) is mounted on the roller block (11). Device according to one of the preceding claims, characterized in that the flatness measurement is made at the moving band (4). Apparatus according to any one of the preceding claims, characterized in that the flatness measurement is made at the elastic lining (13). Device according to one of the preceding claims, characterized in that the flatness measurement is made at the moving roller block (11). 8. The device according to any one of the preceding claims, wherein the braking stand is driven by an electric linear motor. Device according to one of the preceding claims, characterized in that the band (4) is fed tangentially to the coil (2) by pivoting the braking stand. 10. The device according to claim 1, wherein the braking stand is suspended in the measuring frame so that the reaction force is absorbed horizontally and measured by the weighting cell. The device according to claim 1, wherein the control frame is provided at the pass line height of the braking stand, thereby eliminating the tilting moment. 12. The device according to any one of the preceding claims, wherein the linear band tension is generated by the vortex system. 13. The apparatus of claim 12, wherein the linear band tension is generated by motion in a direction opposite to the band travel direction. 12. The device according to any one of the preceding claims, wherein the linear band tension is generated by a magnetic force. The device according to claim 1, wherein the stand bending and band grinding device is arranged between the rotating stands.