ITMI20110585A1 - SYSTEM FOR THE COLLECTION AND RECOVERY OF ROCKING SFRIDES - Google Patents

Description

SYSTEM FOR THE COLLECTION AND RECOVERY OF SCRAPS OF

WINDING

The present invention refers to a device for collecting and recovering the scraps produced during the winding process by the units that make up the automatic winding machine.

In industrial practice, the yarn production technique is largely prevalent in a spinning stage followed by a winding stage in which the yarn is unwound from its spool, purified of its defects and rewound into a package. The winding machines are in fact made up of a plurality of winding units aligned along the front of the machine and equipped with common control and service equipment. Among these common service equipment are the devices for preparing the bobbins to be unwound in the winding units.

As already described in the previous Italian patent application IT 2009A2013 in the name of the same applicant, the scheme of a winding unit is illustrated in its essential components in figure 1 which shows the path of the yarn 2 from the lower spool 1 to the upper collection spool 12, as follows:

- 3. group of wire guide members,

- 4. the thread presence detector sensor, - 5. thread tensioner 5,

- 6. end joining device, currently thread joining, served by

- 9.10. suction vents for the collection and delivery of the ends,

- 11. clearer,

- 12. collection cone, rotated by the roller, and supports supported with

- 14. the bobbin holder arm,

- 15. spool positioning pin 1,

- 20. one or more suction outlets in the vicinity of the spool 1 to eliminate impurities, substantially consisting of hairiness and fibrils that develop with the winding in operation, currently known as dust removal.

Again according to the aforementioned IT application 2009A2013 in the name of the same applicant, both the discontinuous and high-head suction service, for the recovery of the ends with the nozzles 9 and 10, and the continuous and low-head service, for the dust removal with the nozzles 20, is carried out with an individual aspirator 22, one for each of the winding units aligned along the front of the machine. This aspirator consists of a rotary aspirator with a centrifugal impeller 25 driven by an electric motor 26 â € œbrushlessâ € driven in frequency by the control unit 16 of the winding unit.

The nozzle 20 of the â € œdust removalâ € service with continuous low-vacuum suction is connected with a duct 30 to the suction unit of the winding unit, intercepted with a gate 31, controlled by the control unit 16 winding unit and normally kept open during the normal winding process. The nozzles 9 and 10 work in discontinuous with high depression suction during the interruptions of the standard winding. They are respectively connected with a duct 34 to the suction unit 22 of the winding unit, intercepted with a gate 35, controlled by the control unit 16 of the winding unit and normally kept closed during the normal process winding. The gate 35 is opened only on the occasion of the joining interventions. Ultimately, the individual suction unit 22 that equips the single winding unit 23 serves either the low-vacuum â € œdust removalâ € service duct 30 or the high-vacuum suction duct 34.

The different vacuum values required for the two alternative suction services are obtained by operating the centrifugal aspirator 22 at different speeds, which has characteristic curves of the suction depression ∠† P which varies in inverse ratio of the volume flow, according to a beam. of parallel and increasing curves with the increase in rotation speed, as already described in the aforementioned application IT 2009A2013 in the name of the same applicant.

According to the present invention, the two ducts 30 and 34 of each winding station are connected to a common filter 50, individual for each winding station, which has the function of retaining the material collected and transported with the suction and in particular retains both the impurities of the â € œdust removalâ € collected with the winding in operation and the pieces of yarn, the so-called â € œfilmsâ €, removed by the suction of the aspirator 22, when it is connected to the outlets 9 and 10 and operated at high depression with interrupted winding.

In each winding station, the individual filter 50 can be equipped with a single filtering septum of fine mesh which retains all the material: both impurities and lint.

According to a preferred embodiment of the present invention, shown in the detail of Figure 2 in an axonometric view, the individual filter 50 is made with two filtering chambers in series, with an underlying hopper 55 for collecting the separate lint. The first filtering chamber is equipped with a filtering septum 51 of coarser mesh which retains the â € œfilmsâ €, removed by the high vacuum suction by the aspirator 22, when it is connected to the outlets 9 and 10 and operated at high depression. The second filtering chamber, downstream of the first, is equipped with a filtering septum 52 of fine mesh for impurities, consisting of hairiness and fibrils, which instead pass freely through the coarser filtering septum 51 which constitutes the first filtering chamber, both during filtration and when cleaning the filter. The coarser mesh filter media has a hole size of the order of 20 mesh, while the fine mesh filter media has a hole size of the order of 800 mesh.

The filtering septa of the filter 50, both in the construction with a single filtering chamber and in the construction with a double filtering chamber in series, are preferably arranged to receive the flow of the fluid containing the material to be separated from below, so that, when the flow of the With high depression suction, most of the coarse material intercepted and retained by the filtering septum 51 falls spontaneously downwards into the underlying hopper 55, freeing the first of the filtering septa.

Generally speaking, the quantity of material to be retained is mainly made up of lint. The linear dimension of the yarns can in fact range from a few centimeters, in the normal preparation of the yarn splice, up to about ten meters and even more, due to the long defects of the yarn count detected with the clearer.

In industrial practice, the material separated and recovered with the filters is generally recycled to carding, to recover the fibers that make up the lint. In this process, the impurities and the short fibers possibly present in the recovered material are separated and removed, keeping in process only the fibers of acceptable length.

The construction of the double filter chamber filter in series, shown in figure 2, allows for a greater accumulation of material before the overall pressure drop of the filter requires the material discharge operation. In the first filtering chamber, during the filtering of the lint deriving from the search for the ends for joining the yarn, the lint is substantially stopped by the coarse filtering septum and, when the high vacuum suction ceases, most of them fall back and accumulate on the bottom of the filter.

From the bottom of the filters 50, which equip the winding stations, the accumulated material is periodically discharged respectively with ducts 53, intercepted with a gate 54, which meet in a common discharge manifold 70. On the opposite upper side, the filters 50 are equipped with a bleed valve 57, which is opened for the operations of discharging the material accumulated in the filters 50. The opening of these bleed valves 57 preferably isolates the filter 50 from its aspirator 22.

Figure 3 illustrates the assembly of the reeling scraps collection system. All the individual outlets 53 of the winding units 23 are connected to a common manifold 70, which collects all the separated material in the respective filters 50.

The spool preparation devices 63 can also be advantageously connected to the manifold 70, for example as described in the patent application IT 2009 A 2011 and schematically shown here. These devices generate a significant amount of residues of wire lengths, sucked with an individual aspirator 64, deposited in mesh filters 65 and discharged with a duct 68, with a scheme equipped with discharge gate valves 66 and vent valves 67 completely similar to that of the filters 50 of the winding unit according to Figure 1.

All the filters 50 and 65 are connected with the manifold 70 to a collective system for collecting their scraps, consisting of a small-sized duct which is arranged along the machine and which receives the flow coming from all the winding units 23 and, preferably, also by the spool preparation devices 63. The manifold 70 is served by a high-depression aspirator 71, which provides for the periodic discharge of the filter material with pneumatic transport to a general filter 80 which is described in greater detail in figures 4 and 5. To avoid clogging, the speed of transport in duct 70 is kept around 20 m / sec.

The need to unload the material retained by the filters is very variable, depending on the yarns treated in the winder. Generally speaking, the higher discharge frequency is required by the spool preparation devices 63 which require their filters 65 to be cleaned even every 10-20 minutes, in the order of magnitude of a few hundred prepared spools.

The filters 50 that equip the winding stations 23, on the other hand, generally require cleaning with a period of the order of magnitude of an hour, in the case of filters with a single filtering septum of fine mesh which retains all the material: both powders and lint. If the filters 50 are made with double filtering chambers in series, as shown in figure 2, this cleaning frequency is reduced, increasing the intervals between one cycle and the next by approximately 40-50%, unless that very hairy yarns are worked.

This cleaning is preferably carried out for one filter 50 at a time while its winding unit 23 is in operation. The operation takes a few seconds and takes place, for the winding units 23, first by opening their bleed valves 57, preferably isolating their filter 50 from the aspirator 22, closing the valves 31,35 towards the unit winding 23 and then opening the discharge valve 54 on the duct 53, with the aspirator 71 in action. In this way it is avoided that the cleaning of the filter affects the winding in its normal operation. The suction with the aspirator 71 draws air from the vents 57 and empties the filters 50 of the accumulated material bringing it into the general filter 80 through the manifold 70.

General filter 80 can be a conventional filter that indistinctly separates and discharges the lint together with the fine impurities, recycling them to carding. In the carding process, powders, fibrils, â € œnepsâ € and short fibers are eliminated from the production cycle.

According to a preferred embodiment of the invention, the general filter 80 is made with classification of the material in a double cyclone system, illustrated in greater detail in Figure 4 as an overall scheme; in figures 5A, B the cyclones are shown in section to describe their operation.

With reference to figures 4 and 5A, the filtering system 80 consists of a pair of cyclones in series placed in depression with the aspirator 71. The first cyclone 81 is fed by duct 70 with a current of sucked air containing both lint and other impurities coming from filters 50 and 65 which are gradually cleaned, opening their vents 57 and 67 and their gate valves 54 and 66. The current to be filtered is introduced into the cyclone 81 in the upper part and in a tangential direction, generating a downward spiral motion. due to the effect of the centrifugal force, the larger particulate matter, the lint, escapes from the flow and by inertia comes into contact and brakes against the internal conical walls of the cyclone: due to the effect of gravity the particulate slips and accumulates at the bottom of the conical hopper 82, from which it is periodically discharged with the gate 83. This particulate is essentially made up of lint that can be recycled. Due to the pressure difference between the tangential inlet opening 85 and the upper outlet opening 86, the air flow reverses the direction of its motion and rises in a tight spiral upwards to the opening of exhaust 86 aligned with cyclone 81, bringing with it the smaller residual particulate matter in the pipeline 87.

As also illustrated in Figure 5B, the flow of the pipeline 87 is introduced into the second cyclone 91, in particular in its lower conical part 92 and with tangential direction in the opening 94. As for the cyclone 81, also here a motion is generated downward spiral. As a result of the centrifugal force, the medium-sized particulate leaves the flow, by inertia it comes into contact and brakes against the internal conical walls of the cyclone: due to the effect of gravity the medium particulate slips and accumulates on the conical hopper bottom 92, from the which is periodically discharged with the gate 95. Here too, the flow of air containing the finest particulate reverses the direction of its motion and spirals upwards in the upper part 93 of the second cyclone 91. Such upper part 93 is cylindrical in shape and, in its central part, is occupied by a filter cartridge 96, which intercepts the ascending flow and breaks down and retains the residual particulate. The hole pattern of the filter cartridge is of the order of 15 µm. This filtering cartridge is preferably cylindrical, in common axis with cyclone 91, equipped with a blind bottom 97 and a blind upper crown 98, so as to force the air flow to pass through its cylindrical filtering surface, with the flows indicated by the arrows, and then to exit from the upper opening 100 towards the aspirator 71 and its discharge to the atmosphere.

Above the cartridge 96 there is a diffuser 102 of compressed air for washing the cartridge, connected to the service compressed air. During the cleaning operations of the individual filters 50 and 65 of the winding machine, the pressure drop, that is the differential pressure, between the upstream and downstream of the cartridge 96 is constantly checked, for example with the differential pressure gauge 103. When this measurement reaches a predetermined value , at the end of the cleaning cycle the aspirator 71 is stopped and its drain is closed. The cartridge 96 is then cleaned by simultaneously opening the solenoid valve 104 and the gate valve 95 of the hopper 92 and injecting compressed air with the diffuser 102. In this way a â € œbackwashingâ € is carried out from the inside to the € ™ which releases the particulate retained on the external surface of the cartridge The individual filters 50 are cleaned one at a time by opening in sequence their valves 54 and their respective bleed valves 57. For the filters 65 of the preparation devices 63 the procedure is quite similar. With the aspirator 71 a suction depression of 10-13 kPa is exerted, that is 1000-1300 mm of water column. These depression values refer to the depression exerted in the filters 50 and 65 to be cleaned, while the depression values in the downstream members are affected by the pressure drops of the overall circuit.

The device for discharging the winding scraps according to the present invention also allows such discharge to be made with a single duct, and moreover with a small diameter, and with reduced suction power installed, since one filter is discharged at a time. . The number of filters installed for the winding units and the relative shut-off gates is reduced to a minimum, as well as the relative control and command elements.

Claims (10)

CLAIMS 1. Device for collecting the scraps produced by a winding machine consisting of a plurality of winding units (23) aligned and served by a suction system consisting of a plurality of single aspirators (22) which individually equip each winding unit (23) , in which each single aspirator (22) alternately provides continuous low-vacuum suction with winding in operation, for the removal service of impurities and hairiness of the yarn, or â € œdust removalâ € service, or discontinuous high vacuum suction, for the elimination of the pieces of yarn, or lint, deriving from the repair and joining of the yarn with interrupted winding, characterized by the fact that each of the individual aspirators (22) is equipped with a separation filter (50) of the sucked material, this filter, receiving and holding the impurities and lint alternately, and that all the filters (50) of the stations winding machines (23) that make up the winding machine are connected with a common duct (70) to a common general filter (80) for collecting the winding scraps which periodically discharges and receives the material retained by these filters (50), one at a time and jointly for both materials. 2. Device for collecting the scraps produced by a winding machine according to claim 1, characterized in that the individual filter (50) is made with two filtering chambers in series, of which the first filtering chamber is equipped with a filtering septum (51 ) of coarser mesh that holds the lint, removed by the high-vacuum suction by the aspirator (22), and the second filtering chamber, downstream of the first, is equipped with a filtering septum (52) of mesh end that retains impurities. 3. Device for collecting the scraps produced by a winding machine according to claim 2, characterized by the fact that the two filtering chambers in series are made with the coarser mesh with a hole in the order of 20 mesh and with the fine mesh with a hole in the € ™ order of 800 mesh. 4. Device for collecting the scraps produced by a winding machine according to claim 1, characterized in that it is also connected to devices (63) for preparing the packages that equip the winding machine, to discharge the relative filters (65) which collect a significant quantity of remnants of pieces of thread. 5. Device for collecting the scraps produced by a winding machine according to claim 1, characterized in that the common general filter (80) for collecting the winding scraps is made with classification of the material in a double cyclone system, consisting of a pair of cyclones (81.91) in series placed in depression with the aspirator (71) and fed by the duct (70) with a current of sucked air containing both lint and impurities, of which the first cyclone (81) it breaks down the lint and the second cyclone (91) breaks down the residual particulate, these cyclones being equipped in their lower part with conical hoppers and discharge gates (83.95). 6. Device for collecting the scraps produced by a winding machine according to claim 5, characterized in that the upper part (93) of the second cyclone 91 is occupied by a filtering cartridge (96) which intercepts the ascending flow and knocks down and retains the residual particulate. 7. Device for collecting the scraps produced by a winding machine according to claim 6, characterized in that the porometry of the filtering cartridge (96) is of the order of 15 µm. 8. Device for collecting the scraps produced by a winding machine according to claim 6, characterized in that the filter cartridge (96) is cylindrical, with an axis in common with the cyclone (91) and arranged in such a way as to force the flow of Air to pass through its cylindrical filtering surface and then to exit from the upper opening (100) towards the aspirator (71) and its discharge to the atmosphere. 9. Collecting device of the scraps produced by a winding machine according to claim 6, characterized in that above the filtering cartridge (96) there is a diffuser (102) of compressed air for washing the cartridge, connected to the compressed air of service. 10. Device for collecting the scraps produced by a winding machine according to claim 6, characterized in that a differential pressure gauge (103) is installed between upstream and downstream of the cartridge (96) to measure the pressure drop in the cartridge itself.