DE1195787B - Method and device for transporting metal workpieces with an angular cross section, in particular blocks, through a vertical induction coil - Google Patents

Description

Method and device for transporting metal workpieces with angular cross-section, in particular blocks, through a vertical induction coil The invention relates to a method and a device for transporting metal workpieces with angular cross-section, in particular blocks, which are supported by a perpendicular Induction coil are conveyed through in the direction from bottom to top.

We are familiar with the inductive heating of metallic workpieces the horizontal and the vertical continuous process. Be in a horizontal position lying induction coil pushed the workpieces over a base, so is the Wear of the slide rails or guides, especially in systems that work with high temperatures, e.g. B. in steel heating, relatively high. Other transport systems, such as hub bar stoves or chains, also have one Considerable wear is to be expected, or the mechanical transport of the blocks used parts must be equipped with water cooling. Another important one The disadvantage of these devices is that they are relatively large Need space, whereby the induction coil surrounding the annealing material has a relative must have a large diameter. This in turn creates the electrical coupling, the Cosine cp and the efficiency worse.

The aforementioned disadvantages apply to a vertical induction coil because the material to be heated does not have to be carried by furnace parts, the large ones Are exposed to temperature loads. Furthermore, between the Well and the induction coil does not require any special guide or slide rails or at most only those that take up little space, so that the electrical Coupling and thus the overall efficiency of the induction sink is better.

In the case of ovens with a vertical coil, the transport of the material to be heated can be either from bottom to top as well as from top to bottom. The transport from below upwards is given preference, especially at high temperatures, because then the Hot parts lying on the exit side of the coil are unloaded or lightly loaded and removal from the spool is easier; because with unencumbered sticking is not to be expected with hot parts.

For transporting the workpieces through the induction coil from below upwards one knows lifting rams: In the previously known devices with lifting rams However, it is disadvantageous that clamping rings or clamping jaws are provided, the one must have their own drive. In addition, one already has support disks with holding rods used. After the heating has taken place, the holding rods are withdrawn and the bolt removed with the support disc from the induction coil by means of a lifting ram. However, this method is only suitable for ovens that only have one Workpiece are loaded because there are several workpieces on top of each other the support disks take up too much space.

Furthermore, one has also worked with holding pawls that are under the approaches grasp a disc.

With the conventional way of transporting the workpiece from the bottom to the bottom above always has a disadvantageous effect that the column is called after removing the top one Workpiece must be lowered again in most cases, so that the next The entire length of the workpiece is again within the induction coil. The feed that is made with the help of a mechanical, pneumatic or hydraulic Plunger takes place from below, is interrupted by a switch bracket, which is operated by the face of the upper hot workpiece is actuated.

When changing the workpiece length in the heating program, the position this switch bracket can then be changed when a workpiece with the new length emerges from the top of the bobbin. If this is neglected at the appropriate moment, so The removal device generally fails because the workpiece with the new one Length was either too high or not high enough.

The invention relates to the inductive heating of metal workpieces with a square cross-section set the task of holding the workpieces during to ensure the heating process with simple means and at the same time to avoid that the switching device change its position when changing the workpiece length got to. According to the invention, this is thereby achieved in the case of the continuous process from bottom to top achieves that the individual workpieces each against each other at a certain angle staggered inserted into the coil and carried up in the form of a column, wherein the column at the protruding corners of the second workpiece from the top via a limit switch interrupt the lifting of the incandescent material column. Square blocks, for example, are around Staggered 45 ° on top of one another. This creates four protruding blocks from block to block Corners.

It is also part of the invention that pawls are arranged in pairs that attack the protruding corners of the lowest workpiece. The handles move from bottom to top to the outside when stepping through the annealing material column, jump however, back inwards and thereby hold the incandescent material column as soon as it is under the get free space protruding corners. The well-known handles that only connect are used with a washer, so far come to an advantageous Use when the washers with their approaches are superfluous.

It has proven to be particularly useful below the induction coil to provide a turntable which carries guides for the workpieces, related on the respective radius of the table and the previous guide to a certain Angles are offset. In this way, the workpieces are pre-sorted in place transported from where they are lifted by a lifting ram and into the interior of the Induction coil are introduced.

The invention is explained in more detail with reference to the drawings. Of simplicity square blocks have been chosen as workpieces there. The invention is however, it is not only limited to these blocks, but applies to all others as well Metal workpieces with an angular cross-section.

A b b. 1 shows an overall view of the plant; A b b. 2 the corresponding Ground plan with three induction coils for different workpiece diameters. Here, however, the loading device is for only one induction coil pictured.

In the A b b. 3 and 4 is the arrangement and operation of the retaining pawls clearly visible. The A b b. Figures 5 and 6 show the details of the extraction device.

A turntable 2 is provided below the induction coil 1. On this turntable there are guides 3 which are alternately offset by 45 ° from one another. The blocks 4 to be heated are inserted into these guides. The lifting ram 5 with its plunger 6 pushes the block 4 a, which is located vertically under the induction coil, upwards, until its end face reaches the lowest block 4 b of the annealing material column, offset from it by 45 °. The pawls 7 (A b b. 3 and 4) hold the incandescent material column up to this moment, while the pawls 8 are unloaded. If the lifting ram 5 pushes further forward, the pawls 7 are relieved, and the pawls 8 expand outwards, but immediately jump back because they are under spring pressure when the bolt 4a is raised high enough. When the lifting ram is withdrawn, the pawls 8 engage the protruding corners of the bolt 4a and hold the entire column of incandescent material. The pawls 7 and 8 each have to alternately carry the incandescent material column.

This holding device in the form of pawls in connection with the relocation the workpieces against each other requires less effort than the previously known Facilities. It is important above all that for the inventive Holding device no separate drive is required, but that it is perfect works independently.

Above the induction coil 1 , a rotatably mounted lever 9 (A b b. 5 and 6) is provided, at both ends of which a sleeve 10 and 11 is fastened so that it can be easily raised and lowered. These two bushings are also offset by 45 ° from one another. When a block is removed, the corresponding sleeve 10 is pivoted over the induction coil so that the heated block 12a can be pushed into this sleeve with the aid of the lifting ram. The next block 12 b abuts against the wall of the sleeve 10 with its protruding corners. The bushing is raised slightly and actuates a limit switch 13, which interrupts the advance of the lifting ram.

The block column is raised in this way so far that the bottom of the top block and the top of the second block after Switching off the feed are at the same height, regardless of whether a change takes place from long to short or from short to long blocks. A complicated one Switching device, as it was previously required and its position in a Changing the block length always had to change what the operational safety such systems are very impaired, is unnecessary in this case.

The lever 9 pivots the sleeve 10 up to the opening 14, from where the Block can be led to the consumer point, and the sleeve offset by 45 ° 11 over the induction coil, where this sleeve can then pick up the next block.

The fact that the workpieces are placed on top of one another is offset in addition to the advantages and improvements already mentioned, the stability the incandescent material column increased.

To move, twist or slip the block to be lifted 4a of the plunger 6, this plunger can be designed as a magnet or contain a magnet. If the incandescent material column is not raised so high that the plunger 6 can slide into the induction coil, is generally a permanent magnet suffice. For those cases where the plunger is immersed in the induction coil Demagnetization must be feared, a special one can be used under the turntable 2 Coil 15 can be provided which magnetizes the magnet with each cycle.

A round induction coil is generally used in this process, although the workpieces have an angular cross-section. Experience has shown that however, the impairment of the electrical coupling with respect to one of the workpiece shape adapted angular coil only insignificantly. In addition, with a round one Induction coil corner overheating can be avoided.

Claims (6)

Claims: 1. Method for transporting metal workpieces with an angular cross-section, in particular blocks, through a vertical induction coil in the direction from bottom to top, d a -characterized in that the individual workpieces each pushed into the coil offset by a certain angle and raised in the form of a column, the column being attached to the above Corners of the workpieces is held and / or the protruding corners of the second from the top Interrupt the lifting of the annealing material column via a limit switch. 2. Device according to the method according to claim 1, characterized in that in pairs Pawls (7) are arranged, each at the corners of the lowest workpiece attack. 3. Device according to the method according to claim 1, characterized in that that below the induction coil (1) a turntable (2) is provided which Guides (3) for the workpieces (4, 4 a) which, based on the respective Radius of the table and the previous guide, offset by a certain angle are. 4. Device according to the method -according to claim 1, characterized in that that above the induction coil (1) on a swivel arm (9) guides (10, 11) are provided for removing the workpieces that are lifted slightly through the protruding corners of the next workpiece (12 b) via a limit switch (13) interrupt the feed to lift the annealing material column. 5. Apparatus according to claim 3 or one of the following, characterized in that the ram head (6) of the lifting ram (5) is designed as a permanent magnet. 6. Apparatus according to claim 3, 4 or 5, characterized in that an additional coil (15) is provided which the The ram head (6) of the lifting ram (5) is magnetized with each cycle.