SI21360A - Central cross welding drum - Google Patents

Abstract

On its circumference, the central cross welding drum for welding edges features heating elements, which are located one next to the other in parallel to the rotating axis, while a sleeve approaches the drum via a supply cylinder, touches the external side of the drum, is led around the drum and is on the other side detached from the drum with the help of a release cylinder. As soon as the sleeve touches the drum, a current runs via control circuits to the computer determined heating element, which results in heating the element up to 300 degrees Celsius. Its heat is then transferred to the sleeve, which causes the sleeve to melt and to produce a seam, while after the current through the heating element is disconnected, the heating element and seam cool down separately or together as low as down to 74 degrees Celsius. Then the sleeve is released form the drum and is led between one or several pairs of parallel metal cooling cylinders, while the heating elements can be welding filaments, power laser diodes with infrared radiation or piezo-crystals.

Description

IGORVODOPIVC Stolovnik 49 8280 Brestanica

MIDDLE CROSS-WELDING DRUM

The field of technology

The invention belongs to the field of welding technology.

The state of the art

Until now, the prior art has made it possible to weld the sleeves transversely in two ways. The older way required a sleeve to be rested, after which mechanically or pneumatically controlled welding jaws, which were mounted transversely (or perpendicularly to the direction of movement of the sleeve), pressed the sleeve and subjected it to a temperature of up to 300 degrees Celsius for a prescribed period, which was achieved by regulating the heating of the entire calipers or with a current pulse heated welding thread. After the necessary time had elapsed, the jaws opened and the sleeve moved for the length of the bag forward, stopped, and the process was repeated for another hatching. In the newer mode, the sleeve continues to travel at the same speed at all times, and the prescribed rolling time is achieved by compressing the hot jaws of the sleeve, then traveling part of the way, then unloading and waiting for the next rolling request. Several pairs of welding jaws can perform this work.

The essential disadvantage of both modes is the low average sleeve speed, which is obvious in the first mode, but in the second mode, the speed is limited by the length of the path, which is mechanically limited.

Technical description of the invention

According to the invention, the problem is solved by welding the sleeve 2 on the center transverse welding drum 1 by extending the sleeve 2 around the drum 1 and welding the sleeve 2 while being guided around the circumference of the drum 1 on which the heating elements are mounted 3. The invention will be described in the embodiment and in the drawings showing:

Figure 1:

center transverse welding drum heating element control circuit

Figure 2:

center transverse welding drum plastic sleeve inlet cylinder separating cylinder in parallel cooled metal cooling cylinders pressure unit double-toothed timing belt balancing cylinder pressure cylinder tension cylinder

Figure 3:

center transverse welding drum welding thread heat resistant and electrically conductive profile 21 spring

Figure 4:

double sided toothed timing belt 15 intersection of timing belts

Figure 5:

center transverse welding drum plastic sleeve heating element double toothed toothed belt matching teeth pressure teeth welding thread welding groove teflon coated glass fabric laser diode, piezzo crystal

The invented center transverse welding drum 1 achieves high speeds in the rolling of all types of plastic sleeves 2 by having heating elements 3 arranged on the circumference of the drum 1, which lie side by side with the axis of rotation of the drum. Different types of heating elements 3 can be used on it: welding thread 17, power laser diodes with infrared radiation 22, piezzo crystals 22. The distance between heating elements 3 may be the same, but a group of two, three or more heating elements 3 may form spacing pattern. Within a group, heating elements can be 3 of one, two or more widths for different weld widths 14.

The sleeve 2 is brought to the drum 1 via the feed roller 4, where it touches the outside of the drum 1, is guided around the drum 1, and then moves away from the drum 1 again on the other side through the separating cylinder 5. for the first time it touches the drum 1, and up to 99.9 percent of the circumference of the drum during the point of the drum 1, where the sleeve 2 again moves away from the drum 2. When the sleeve 2 is on the drum 1, it flows through the control circuits 16 through a computer-defined heating element 3, causing the heating element 3 to warm up to 300 degrees Celsius. Electrical circuits are supplied to the control circuits via electrical power, and computer commands are supplied to the control circuits 16 via the address lines and data lines.

The heat of the heating element 3 is transferred to the sleeve 2, which causes the sleeve 2 and the weld 14 to melt. After switching off the flow through the heating element 3, the weld 14 and the heating element 3 are separately or jointly cooled. With separate cooling, the sleeve 2 leaves the circumference of the drum 1 after about 75 percent of the circumference of the drum 1, then the sleeve 2 is guided between one or more pairs of parallel cooled metal cooling cylinders 6. The total cooling is slower and must be forced. When the sleeve 2 and the drum 1 are separated, they must both be cooler than 75 degrees Celsius, otherwise unwanted welds may occur upon re-contact. The sleeve 2 has a constant speed during rolling, and no tensile force is applied to the weld 14 until it is sufficiently cool and tensile.

When welding thread 17 is used as the heating element 3, additional speed increase can be achieved by preheating. The full flow flows through the selected heating element 3 before the first contact with the sleeve 2 and warms it to the operating temperature and then maintains it with the pulse width modulated current until the welding time has elapsed.

Good contact of the weld sleeve 2 with the drum 1 is provided by one or more pressure units 7 with double-toothed toothed belts 8, tensioned by several types of cylinders, namely rollers 9, pressure cylinders 10 and tensioning cylinders 11. Said belts 8 may have balancing teeth. 12 inwards and compression teeth 13, up to 8 mm high, coated with heat-resistant substance, facing outwards to the drum 1 and arranged in the same pattern as the heating elements 3 to direct pressure directly to the weld 14. The belt 8 may be single, but may be there are several in parallel, side by side. The total width of the straps 8 is equal to the length of the drum 1. The speed and position of the pressure teeth 13 are aligned with the circumferential velocity of the drum 1 and the position of the heating elements 3 by means of coordinating cylinders 9 driven by the circumferential velocity of the drum 1. In the section that touches the sleeve 2, the straps 8 are tensioned around two balancing cylinders 9, between which one or more pressure cylinders 10 are mounted, and one or more tensioning cylinders 11 may be mounted on the opposite section.

In certain designs of pressure units 7, the installation of pressure and tension cylinders is not necessary. The distance between the alignment cylinders 9 of the same pressure unit 7 may be 1 to 99 percent of the circumference of drum 1. At the circumference of drum 1, one or more completed pressure units 7 may be provided with the same or different sections of paths along which the straps 8 touch the drum 1. In doing so, the longitudinal joints of the belts 15 of the individual pressure unit 7, where the pressure teeth 13 do not press on the weld 14, are displaced relative to the joints of the belts 8 of all other pressure units 7, so that the weld 14 is not interrupted.

The function of the cylinders is as follows: the inlet cylinder 4 brings the sleeve 2 to the circumference of the drum 1, the coordinating cylinder 10 ensures that the speed and position of the pressure teeth 13 are aligned with the circumferential speed of the drum 1 and the position of the heating elements 3, the pressure cylinder 10 presses the belt 8 to the forming sleeve 2 weld 14, tensioning cylinder 11 tightens the straps 8, the separation cylinder 5 separates the sleeve 2 from the drum 1, and the cooling cylinders 6 further cool the weld 14 to become tensile.

The electrical voltage is supplied to the drum 1 by brushes and sliding rings on the axis 4 of the drum 1. Two or three power lines are connected to the control circuits 16 that control the flow through the selected heating elements 3. An individual control circuit 16 can control one, two or several heating elements 3. Each heating element 3 has its binary address according to the position on the drum 1, and its status (on, off) depends on the data at the corresponding address. Each control circuit 16 switches the individual heating element 3 on or off according to the commands in the address and data lines. Thus, any number of heating elements 3 can be switched on at the same time.

The heating elements 3 may be welding threads 17, power diodes with infrared radiation 22 or piezzo crystals 22.

The welding threads 17 are movably clamped on each side of the drum 1 and tensioned by two springs 21 for thermal expansion. Welded yarns 17 are treated laterally and below the support by treated heat-resistant and electrically conductive profiles 18 made of Teflon, vitrex or other materials with grooves 19 with a depth of up to 2.5 thread thickness. The Teflon-coated glass fabric 20 covers the top of the thread to prevent the coiled sleeve 2 from sticking to the welding thread 17.

Power laser diodes with infrared radiation 22 with special-purpose glass enclosures are placed close to each other in parallel rows and form a heating element 3. The power laser diodes 22 switched radiate heat radially outward to the straps 8. Intermediate radiation is absorbed in the sleeve 2, by locally heat, melt and weld. There is no teflon-coated glass cloth in this type of welding 20. High-power laser diodes 22 in a single row can have their own binary address, which together with the binary address of the type determines the two-dimensional position of the weld 14.

The purpose-built piezzo crystals 22 are arranged close to each other in parallel rows and form a heating element 3. The on-off piezzo crystals 22, by swinging in the direction of the sleeve 2 transversally or longitudinally, rub against the sleeve 2, generating heat of friction. There is no teflon-coated glass cloth in this method of welding. Piezzo crystals 22 may have their binary address, which together with the binary address of the species determines the two-dimensional position of the weld 14.

For the applicant Igor Vodopivac:

LAWYER \ mag.Mari I KARLOV ^ EK SAVIH0U7 .CELJE

G3-5U1-G43,

Claims (4)

1. A center transverse welding drum for rolling sleeves which has hitherto been welded with mechanically or pneumatically controlled welding jaws positioned transversely to the direction of movement of the sleeve, characterized in that it is provided with heating elements 3 at its circumference, which are supported by power circuits via control circuits. 16 the electrical voltage is supplied, and computer commands are supplied to the control circuits 16 via the address lines and data lines, which allows the selected heating elements 3, and thus the sleeve 2, to be heated to 300 degrees Celsius, which causes the sleeve 2 and weld 14 to melt. however, the sleeve 2 travels up to 99.9 percent of the drum circumference, and after switching off the current through the heating element 3, the weld 14 and the heating element 3 are separately or jointly cooled, leaving the circumference of the drum 1 after approximately 75 percent of the circumference of the drum 1, until it moves away and leads between one or more pairs of parallel cooled metal cylinders 6 through the separating cylinder 5, and the drum 1 has one or more circumference on the circumference pressure units 7 having the same or different path sections, in which one or more of the parallel toothed gears 8 touch the drum 1 and are tensioned through the alignment cylinders 9, the pressure cylinders 10 and the tensioning cylinders 11 and have the alignment teeth 12 inwardly and pressure teeth 13 up to 8 mm high, coated with a heat-resistant substance, facing outwardly to the drum 1 and arranged in the same pattern as the heating elements 3 arranged on the drum 1, to direct pressure directly to the weld 14, and the distance between the balancing cylinders 9 of the same pressure unit 7 may amount to 1 to 99 percent of the circumference of the drum 1 and the longitudinal joints of the straps 15 of the individual pressure unit 7, where the pressure teeth 13 do not press on the weld 14, are displaced relative to the longitudinal joints of the straps 15 of all other pressure units 7, so as not to transverse interruption of weld 14 occurs, and the velocity and position of the pressure teeth are aligned with the circumferential velocity of the drum 1 and the position of the heating elements ents 3 by means of balancing cylinders 9 and wherein the welding threads 17 are movably clamped on each side of the drum 1 and tensioned with two springs 21 due to thermal expansion and serve laterally and below the support the heat-resistant and electrically conductive profiles 18 made of Teflon, vitrex. or other materials having grooves 19 of depth up to 2.5 threads of thickness, and the top of the welding thread 17 is covered with Teflon-coated glass cloth 20 so that the welded sleeve 2 does not adhere to the welding threads 17. 2. Center transverse welding drum as below 1, characterized in that the supply of current allows even before the contact of welding thread 17 with sleeve 2, preheating of welding thread 17 to operating temperature, which increases the welding speed. 3. Center transverse welding drum as below 1, characterized in that the heating elements 3 are power laser diodes with infrared radiation, which are arranged close to each other in parallel rows with the glass housing of the dedicated shape and where the laser diodes 22 are switched on. heat radially outwards to the strap 8 and the radiation is absorbed in the sleeve 2, locally -1010 warms, melts, and welds, with laser diodes 22 individually in series having their own binary address, which together with the binary address of the species determines the two-dimensional position of the weld 14, with no teflon-coated glass cloth 20 in this welding mode. 4. Center transverse welding drum as in claim 1, characterized in that the heating elements 3 of the purpose-built piezzo crystals 22 are arranged closely adjacent to each other in parallel types, with the piezzo crystals 22 switched on by oscillation in the transverse or longitudinal direction of the sleeve position they rub against the sleeve 2, generating the heat of friction and the piezzo crystals 22 may have their binary address, which together with the binary address of the species determines the two-dimensional position of the weld 14, with no teflon-coated glass cloth 22 in this welding mode.