MXPA97003003A - A method to remove, rollers, coverings, elastomerically used, and a device to carry out my - Google Patents

Abstract

The present invention relates to a method for removing all elastomeric roller covers used, characterized in that the rotary cutting head has cutting tools mounted on an indexable insert holder that is advanced at one end of the ends of a cover Elastomeric of a rotating roller, diametrically, from the cover to an external position to a roller core, and the cutting head moves along the rotating roller to the opposite end of the cover, the circumferential velocities of the cutting tools are from 15 to 70 m

Description

A METHOD TO REMOVE, ROLLERS, COVERINGS OR ELASTOMERIC COATINGS, USED, AND A DEVICE TO CARRY OUT THE SAME FIELD OF THE INVENTION The present invention relates to a method for removing or removing used, elastomeric rollers, coatings or coatings, and to a device for carrying out the method.

BACKGROUND OF THE INVENTION To date, the tops of the rollers have been removed or removed, either by burning them or by removing them on lathes. The burning process is accompanied by emissions of harmful substances. Due to the heat emitted in combustion, it is necessary to drill the cores and fasten them with bolts. However, overheating and therefore bends can occur. It can also happen that the necks are burned. The rubber hoses, which remain after combustion, can only be disposed of at very high costs. REF: 24521 Overall, combustion requires relatively high energy levels. The elimination around the elastomeric covers or coatings, used, of the rollers, generates chips that are detached and can only be disposed of with difficulty. As previous experience has shown, chips, which fall at great distances, increase the danger of an accident. In addition, when the coverings are removed on a lathe, the outermost layer of the core can not be removed at the end, therefore, this method always involves some diametrical wear.-DE-OS 22 48 853 discloses an operational method for preparing motorized tireless heel tires, for retreading, in which the residual rubber is roughened from the tire with a rotary cutter, and the cutting edge of the cutter is preferably grooved. These cutters are preferably used in a milling machine, this generates a rasping surface that will undergo a particularly close bond with the raw material that is applied for the rebate t aj e US-PS 2,265,643 describes a tool Cutting to scrape the surface of rubber tires, which are to be retreated, this tool is used to create a uniform surface on and which will take place after the retreat. US-PS 1,971,428 discloses a tool by which excess rubber is removed from defective printing rollers. This tool also removes relatively thin layers of rubber cover or coating to create a uniform surface again. US-PS 1,718,793 discloses a device for eroding rubber surfaces which will subsequently bond to form the inner tube of automobile rims. The method and device for preparing a tube in accordance with DE-OS 14 79 623 serves the same purpose. A thin layer is removed to obtain a rougher surface. US-PS 2,398,763 discloses a cutting device for soft rubber, cotton and felt, having a loose texture or fibrous composition. This cutting machine, rotating, has a special design of the cutting teeth. Figures 6 and 7 show the preparation of an elongated notch or the removal of the outer layer of a roller to give a smaller diameter. The cut is made by a saw blade built in a very particular and complicated, which loses its edge quickly and to leave it running again requires very high costs. This device is not suitable for removing the relatively hard, elastic elastomer layers from used rollers. Therefore, in practice, elastomeric roller covers or coatings, used, have been removed, either by burning them or around them. But the processes of burning and around are very slow and therefore involve very high costs.

DESCRIPTION OF THE INVENTION The objective of the present invention is to improve the method for removing or removing elastomeric, roller, used covers or coatings, which is more economical, safe, non-harmful to the environment, and finally simpler and faster to carry out. This object has now been achieved by approaching a rotating cutter head, having a number of cutting tools mounted on a rotary insert holder, from one end of the cover or casing of the rotating roller, to a position close to the core of the roller, and the cutting head moves along the rotating roller, to the other end of the cover, and the circumferential speeds of the cutting tools are from 15 to 70 m / s, preferably from 40 to 50 m / s. In the event that the elastomers have a Shore A hardness greater than 90, the cutting tools are equipped with lathe tools. In the event that the elastomers have a Shore A hardness of up to about 90, the ring cutting tools have proved to be excellently successful. In both variants of the method, small particles of approximately equal size are produced, instead of chips.

When lathe tools are used, chips-like particles will form. At the high cutting speeds, used according to the invention, the elastomeric covers or coatings used, behave no more as elastomers, but as perfectly cut materials such as wood or plastics. To date, this behavior has been observed and used only in the surface treatment of elastomers, in accordance with EP-A1-0 625 406. In this method, however, only very thin layers are removed from the surface. It could not be anticipated that with a correspondingly increased power supply and with correspondingly different tools, such as annular cutting tools or lathe tools, the entire casing or cover, used, could be removed from the rolls, even without damaging or wear the core of the roller. To safely prevent the diametral wear of the core and lengthen the service life of the cutting tools in the rotating cutting head, the latter approaches only to a position close to the core of the roller. In this way, a thin residual layer of elastomeric coating, used, remains on the core of the roller. This is preferably removed with one or a certain number of circular disc brushes, rotating, juxtaposed, with braided steel wires. This circular disc brush moves along the rotating roller in a position which is behind the rotating cutter head, but simultaneously with it. The remnant of the elastomeric cover is removed in the powder form. The core of the roller, however, is not damaged or partially removed as in the process around it.

Another advantage of the method according to the invention is that the particles formed from the elastomeric coatings due to cutting, and the powder formed in the subsequent brushing, can be removed by suction. These particles can be stored, transported and disposed of easily, and can even be reused as rubbers for the soil. Another advantage of the method according to the invention is that the rotary cutting head, after having completed the work on a roller, can proceed to work on the next roller, in the opposite direction. Thus, it is not necessary to move the rotating cutter head and the rotating circular disk brush to its initial positions. On the contrary, it is only necessary to move the position of the rotating circular disk brush with respect to the rotating cutter head, so that when working on the next roller, in the opposite direction, the circular disk brush, rotating , move again along the next rotating roller, in a position that is delayed with respect to the cutting head, rotating, but simultaneously with it. The device for carrying out the method according to the invention consists of: a) a machine tool for fixing and rotating the rollers, and having a support for advancing and adjusting the cutting tool; b) a rotating cutter head having a rotary insert holder and a self-drive for the cutter head. The rotary insert holder is equipped, either with lathe tools or with annular cutting tools, depending on the hardness of the elastomeric cover used. Since the body of the rollers is equipped with covers of the screws having a Shore A hardness of up to about 90, ring cutting tools are predominantly used. Since most of the covers of the screws have only thicknesses of up to 25 mm, it is possible to use ring cutting tools, according to the invention, having diameters of 50 mm. With these annular cutting tools, thicknesses of the roofs of up to 25 m can be eliminated in one working cycle. The rotating cutter head produces circumferential speeds of 15 to 70 m / s, preferably 40 to 50 m / s. At those high cutting speeds, the covers of the used ones behave as not the tomeric, but as perfectly cut materials such as for example woods and plastic that can be cut. In the covers of the drills that have a Shore A hardness of greater than about 90, the cutting tools, annular, can no longer be used, but usual lathe tools must be used. The rotary insert holder can be equipped in such a way that, in principle, the turning tools can be used in both working directions. Thus, in this procedure it is also possible to work on a roller, in one direction, and work on the next roller in the return direction. Usually the rotary insert fasteners have at least two cutting edges - but most of the time they have more cutting edges. Preferably, in accordance with the invention, rotary insert fasteners are used which can accommodate four cutting tools. The elimination of the remnants of the elastomeric covers or coatings, which remain on the core of the roller, is preferably carried out with one or several juxtaposed rotating circular brushes, which have braided steel wire. For this purpose, the device according to the invention additionally comprises: c) another support for advancing and adjusting a circular disk brush, rotating, with self-drive. These brushes are also preferably designed to work with circumferential speeds of 15 to 70 m / s, preferably 40 to 50 m / s. The disc brushes, circular, commercial, are not wide enough to remove the remnants of the covers of the remaining tomes, from the core of the roller, with the same working speed as the cutter-rotating head. Therefore, a number of these brushes are mounted, preferably in juxtaposition, to produce an activity width of 1 to 2 cm. Furthermore, it has been established that the efficiency and service life of these circular disc brushes can be substantially improved if the braids of the steel wires are conglutinated with a plastic, elastic material. Polyurethanes, hot-melt adhesives and block copolymers, thermoplastics, have proven to be particularly useful. On the one hand, this conglutination with a plastic, elastic material increases the rigidity of the braided steel wires and therefore increases the aggressiveness of the brush. On the other hand, the braid retains some residual elasticity in such a way that the core of the roller is not damaged by the steel brush, as would happen with too short and too rigid steel wires. These braids of steel wires, conglutinated with a plastic, elastic material, and circular disc brushes produced from them, are the subject of the German Utility Model No. 296 08 399.2. A typical and preferred embodiment of the device according to the invention is further illustrated in the appended figures.

Figure 1 shows a preferred design of the device according to the invention, in a top plan view.

Figure 2 shows a cross section of this device.

Figure 3 shows a section of a circular disk brush.

In the figures, 1 represents the core of the roller; 2 represents the used elastomeric covering or coating, which is on the roller, which is to be removed; 3 represents the support for the cutting tool; 4 represents a rotating cutter head with a rotary insert holder; 5 represents a support for a circular, rotating disk brush; 6 represents a circular disk brush; 7 represents the disk of the circular disk brush; 8 represents the braided steel wires; 9 represents a region of the braided steel wires, which is conglutinated with a plastic, elastic material.

It is noted that in relation to this date, the best method known to the applicant to carry out the aforementioned invention, is that which is clear from the present description of the invention. Having described the invention as above, the content of the following is claimed as property:

Claims (13)

1. A method for removing or removing used elastomeric rollers, covers or coatings, characterized in that a rotating cutter head having a number of cutting tools mounted on a rotary insert holder approaches from one end of the roller cover rotates to a position close to the roller core, and the cutter head moves to 1? length of the rotating roller towards the other end of the cover or lining, the circumferential speeds of the cutting tools are from 15 to 70 meters per second (m / s).

2. The method according to claim 1, characterized in that circumferential speeds ranging from 40 to 50 m / s are used in the cutting tools.

3. The method according to claim 1 or 2, characterized in that the cutting tools for elastomers having a Shore A hardness greater than about 90, are lathe tools or turner gouges.

4. The method according to claim 1 or 2, characterized in that the cutting tools for elastomers having a Shore A hardness of up to about 90, are annular cutting tools.

5. The method according to any of claims 1 to 4, characterized in that the remnants or residues of the covers and the screws, which remain on the core of the roller, are removed with one or several rotating circular disc brushes, juxtaposed, having braided steel wires, wherein the circular disc brushes move along the rotating roller, in a position delayed with respect to the cutter head, rotating, but simultaneously thereto.

6. The method according to any one of claims 1 to 5, characterized in that the particles formed from the covers of the tomeric, by cutting, and the powder formed in the subsequent brushing, are removed by suction.

7. The method according to any of claims 1 to 6, characterized in that the cutting head, rotary, after having finished the work on a roller, proceeds to work on the next roller, in the opposite direction.

8. A device for carrying out the method according to one of claims 1 to 7, characterized in that it consists of :. . a) a machine tool for holding and rotating the rollers, which has a support for advancing and adjusting the cutting tool; b) a rotating cutter head with a rotary insert holder and a self-drive for the cutter head.

9. The device according to claim 8, characterized in that it additionally comprises: c) another support for advancing and adjusting a circular disk brush, rotating, with drive itself.

10. A device according to claim 8 or 9, characterized in that it additionally comprises: d) a suction or suction means, for the particles formed by the cut and for the powder formed in the subsequent brushing.

11. The device according to any of claims 9 or 10, characterized in that the rotating brush with self-drive, is designed so that it can be moved laterally.

12. The device according to any of claims 9 to 11, characterized in that the circular disc brush is equipped with one or several juxtaposed discs having braided steel wires.

13. The device according to claim 12, characterized in that the braids of steel wires are conglutinated with a plastic, elastic material.