METHOD AND GROUP FOR CLEANING AND OPENING ROVING TUBES IN A SPINNING LINE

Description

DESCRIPTION Field of technology 5 The present invention falls within the field of textile machinery of a spinning line. In In particular, the present invention is directed to a wick opening cleaning group, in particular applicable to an integrated device of 10 exchange of a reel and tube transport system between a spindle and a spinning wheel of a spinning line. State of the art As is known, the coils formed on the spindle bench, consisting of from a tube on which the stretched wick is wound and 15 wrong at the counter, they are transported to the spinning mill. spinning wheel, the bobbins are found hanging on a frame processing, from which the wicks for the spinning mill processing. When the bobbins are being processed they are sold out, they are replaced by the coils 20 from the casting bench. The exhausted coils are made up of the tube completely free of wick (called "tube empty") or from the tube provided with some residual wick windings (called "tube" 25 dirty"). The dirty tubes are cleaned to obtain tubes empty; the empty tubes thus obtained and those taken from the spinning mill they are brought back to the counter and replaced there to the coils that have formed in the meantime, so that 5 the spindle bank can proceed to the formation of new ones coils. In some plants, cleaning dirty tubes It takes place in a special device, usually called "cleaner", which removes residual wick. 10 The Applicant has instead designed an integrated device for cleaning dirty tubes and exchanging empty tubes with the bobbins formed on the casting bench. Such device is illustrated in the International Application WO-A1-2016 / 083944 and in documents EP-A1-3470561 and EP- 15 A1-3385414, all in the name of the Applicant. This integrated device provides primary cleaning means with suction and secondary cleaning means blowing, capable of separating the wick sections residue from the dirty tube, dragging them into a 20 air current. In order to maximize the yield of the spinning line, the residual wick sections dragged by the current of air are opened, collected and reintroduced into the spinning process, for example at the 25 battery machines, or stored, for example in bags or pressed into bales, to then be re-introduced in the process at a later time. The Applicant has However, it was found that these wick sections, although opened or reduced to short fractions, when entered 5 again in the spinning process, are often the cause of defects in the yarn produced, likely due to of the compactness of the fibres and of the twisted state in which they pay, as well as the cause of efficiency problems of the machines, such as battery-powered ones. 10 For this reason, some devices are already known, usually called “sfiocatori” devices, in able to suck up the residual wick sections, separating them from the tubes, and defibering them by traction, in so as to obtain fibre flakes which, when reintroduced 15 in the spinning process, do not cause irregularities and imperfections. An example is described in the application for Italian patent for utility model MO95U000021. The known solutions, however, have proven to be unsuitable to modern spinning processes, characterized by 20 particularly high speeds, especially in the case of highly automated lines that use integrated devices for exchanging tubes. Purpose of the invention The purpose of the present invention is to realize 25 a group of cleaning and opening of the residual wick on dirty tubes that meet the needs of the industry and at the same time overcomes the drawbacks mentioned above with reference to the prior art. Brief description of the figures 5 Features and advantages of the cleaning group and opening of the wick according to the present invention will be evident from the description below, given by way of example and not as a limitation, in agreement with the figures in the attached tables, in which: 10 - Figure 1 shows an example of a portion of a spinning line with integrated device exchange; - figure 2 illustrates the exchange device with cleaning and opening group according to a form of 15 embodiment of the present invention; - figure 3 shows a cleaning and opening group, according to an embodiment hereof invention; - figure 4 represents a view of the group of 20 cleaning and opening busy with a dirty tube; - figure 5 is an enlargement of a tang of the group of cleaning and opening, according to a form of embodiment of the present invention. Detailed description of an embodiment 25 With reference to the attached figures, with 1 it is overall indicated an example of a portion of a spinning line comprising a 2 vessel region in which houses a plurality of vessels 4 containing each a roll of ribbon, a 6 spindle counter next to it 5 to the region vessels 2 to be fed by this with the tape, and a plurality of spinning machines 8, for example arranged parallel to each other. Bench 6 stretches and twists the ribbon coming from the vases 4 and wraps it around empty tubes, forming 10 coils 10 transport to the spinning machine. For this purpose, the bobbins 10 are made available to a 20-carriage of bank 6. A spinning line transport system comprises a main transport device 22, usually called "plank", suitable for taking the 10 reels 15 from carriage 20 and to move them in suspension, at a default quota, usually via a tape main 22'. The main transport device 22 is also suitable for loading wagon 20 with tubes empty 14. 20 The transport system also includes a device secondary transport 26 suitable for moving the coils 10 towards the spinning wheels 8 and dirty tubes 12 (or sometimes empty) towards bench 6. For example, the secondary transport device 26 is 25 shaped like a closed ring and includes a 26' track having 8' sections running parallel to the spinning wheels 8, seamlessly. Spinning line 1 includes an integrated device 50 suitable to cooperate with the main device of 5 transport 22 serving the bench 6 and with the device secondary transport 26 which serves the spinning machines 8, for carry out the collection of dirty tubes 12 from the secondary device 26 and coils 10 from main device 22, cleaning the tubes 10 dirty 12 to get empty tubes 14, the exchange of the 10 coils with the 14 empty tubes and the release of the coils 10 to the secondary device 26 and of the empty tubes 14 to the main device 22. In accordance with one embodiment, for example 15 illustrated in figure 2, the integrated device 50 cooperates with a 26'' terminal section of track 26' of the secondary device 26 which serves the spinning machines 8 and with a 22'' end section of the 22' conveyor belt main device 22 serving bank 6. 20 An example of the implementation of the integrated device 50 is described in International Application WO-A1- 2016 / 083944 of the Applicant, whose teaching is here incorporated. The integrated device 50 comprises a group of 25 cleaning and opening 70 suitable for working on a tube dirt 12 to suck out the residual traces of this wick R and to open them (in jargon, “unravelling”), that is to shred them by traction in order to obtain separate fiber flakes and / or roving fractions. 5 The cleaning and opening group 70 comprises a tube cleaner 72 which extends mainly along one axis central vertical W tube; inserted cleaner tube 72 on the dirty tube 12, the central axis of the tube W is arranged coaxially to the dirty tube 12 or parallel 10 to the Z-axis of the dirty tube 12. The cleaner tube 72 comprises a tube wall 74 cylindrical, for example divided into a first wall 74a or lower wall and a second wall 74b or wall superior, superimposed and coaxial to the first wall 15 74a. The tube wall 74 extends axially between a lower end 74l and an upper end 74u along the said central axis of the tube W. The cleaning and opening group 70 comprises means of air intake (not shown) operated by 20 create an air intake current Fa inside the cleaning tube 72, from the end lower 74l towards upper end 74u. For example, such air suction means include a fan configured to create the current of 25 air intake Fa, operationally connected at the upper end 74u of the tube wall 74. The cleaning and opening group 70 also includes a opening assembly 90, applied to the cleaning tube 72, preferably completely inside the tube 5 cleaner 72, near the upper end 74u of the tube wall 74. The opening assembly 90 is configured to intercept the entire passage section of the air intake current delimited by the wall tube 74. 10 The opening assembly 90 includes an outlet duct 94, an air-permeable septum 92 configured for create a constriction for the air flow suction Fa and to convey the wick towards the outlet duct 94, and a primary duct of 15 blowing 96 which flows into the outlet duct 94 in an opening zone 97, for example via a plurality of primary blow holes 99. Preferably, said primary blow holes 99 they are arranged circumferentially with respect to the axis 20 central W tube, for example organized in one or more file. The cleaning and opening group 70 includes first means air blowing (not shown), operationally connected upstream to said primary blowing duct 25 96, for example via a blow-air connection 101, in order to forcibly introduce a first current blowing air F1 which splits into primary air jets blown from the primary blow holes 99 in the duct exit 94. 5 Preferably, the primary blow holes 99 are configured so that the primary air jets are directed upwards. According to a preferred embodiment, the septum 92 includes a septum wall 98 annular with respect 10 to the central axis of the W tube; preferably, the wall septum 98 converges towards the outlet duct 94. For example, the septum wall 98 is convergent towards the axis central W tube towards the upper end 74u, and preferably truncated conical, i.e. equipped with a 15 major base 104 and a minor base 106. The partition wall 98 is also provided with a plurality of 100 appropriately calibrated lights that pass through it and make it permeable to air, while still creating a localized bottleneck for the air flow 20 suction. Preferably, the septum wall 98 having a convergent configuration towards the outlet duct 94 facilitates the conveyance of the wick or the collection of any fiber flakes and / or wick fractions 25 already detached from the residual sections R, R1, R2 of the wick, towards the said outlet duct. For example, the internal diameter of the pipe wall 74 is between 20 and 100 times greater than the diameter of one of the said lights 100. For example, in one embodiment, the 5 pipe wall diameter is between 70 and 90 millimeters, for example greater than 80 millimeters, and each 100 light has a diameter between 1 and 2 millimeters, preferably less than 1.5 millimeters. Preferably, furthermore, the 90 opening assembly 10 comprises a shank 102 attached to the septum 92, for example at the top of the truncated conical wall 98; shank 102 is crossed axially by the duct exit 94, for example arranged coaxially to the wall septum 98 truncated cone, and from the primary duct of 15 blowing 96, which extends along a direction that intersects the central axis of the tube W, for example orthogonally. The cleaning and opening group 70 also includes second air blowing means suitable for blowing 20 forced into the cleaning tube a plurality of seconds air jets, around tube 12, preferably orthogonally to the central axis of the W tube. For example, said second air blowing means include a lower collar 76, fixed 25 at the lower end 74l of the tube wall 74, and a air compressor operationally connected to said lower collar 76. The lower collar 76, for example in the form of a ring, includes externally at least one air connection 78 and 5 internal paths that lead to a plurality of holes secondaries 80, arranged on the internal lateral surface of the lower collar 76. Preferably, the holes secondaries 80 are configured so that the second jets air is directed radially towards the tube 10 dirty, i.e. perpendicular to the central axis of the tube W. The 90 opening assembly is located downstream of the holes secondary 80. According to a preferred embodiment, the group 15 cleaning and opening 70 includes a first collar intermediate 82a, fixed to the upper end of the first wall 74a, provided with a support surface 84 annular, and a second intermediate collar 82b, fixed at the lower end of the second wall 74b. 20 Furthermore, preferably, the larger base 104 is applied between the first intermediate collar 82a and the second intermediate collar 82b, such as to intercept the entire air passage section delimited from the tube wall 74, while at the smaller base 106 is 25 fixed the shank 102. Furthermore, the cleaning and opening group 70 includes means of actuation, e.g. pneumatic or electric, configured to support and move in translation the cleaning tube 72 along the central axis tube W between a 5 upper limit position and one limit position inferior. For example, said actuating means comprise a pneumatic actuator 110 operationally connected to the wall pipe 74 of cleaner pipe 72. 10 During normal operation of the device integrated 50, the dirty tube 12 is on board the integrated device 50 and has initial residual traits of wick R1. Furthermore the dirty tube 12 is usually equipped with a 12a attack zone, to which is 15 fixed the initial end of the wick of the bobbin. Typically, the 12th attack zone features seconds residual sections of wick R2. Preferably, the air suction means are permanently active and produce inside the tube 20 cleaner 72 the air suction current Fa. In an initial operating configuration of the cleaning and opening group 70, the cleaning tube 72 is in the upper limit position. In a descent phase, by activating the means of 25 drive, the cleaning tube 72 is made to move towards the lower limit position, slipping over the dirty tube 12. During the descent phase the first ones are also activated Air blowing means. Joint in the limit position 5 lower, a rising phase is started, during which, through activation of the actuating means, the cleaning tube 72 is moved to the position upper limit, gradually slipping away from the dirty tube 12. The air suction means continue 10 to be active, as well as the first blowing means air. Furthermore, preferably, starting for example from lower limit position and for a predefined interval of the ascent phase, the 15 seconds air blowing means, which, through the action of the secondary air jets contribute to the detachment of the residual sections of wick R, R1, R2 from the dirty tube 12, and are particularly effective for cause the detachment of the second residual sections of 20 R2 wick from attack zone 12a. During operation, the air flow of Aspiration Fa and the localized depression that occurs realizes upstream of the septum 92 they direct the sections of residual wick R, R1, R2 upwards, i.e. towards the 25 September 92 itself; moreover, presumably, the air jets primaries in the outlet duct 94 cause a further localized depression that sucks in the ends of the tracts residues R, R1, R2 inside the outlet duct 94, in which, the energetic action of the primary air jets and the 5 depression caused by these, flakes the wick in very short fiber flakes and / or roving fractions. Innovatively, the cleaning and opening group according to the present invention meets the needs of the sector, as it allows the reintroduction of flakes of 10 very short fiber or wick fractions in the process of spinning, and overcomes the drawbacks mentioned above, as cleaning dirty tubes is particularly fast and suitable for automated lines. Advantageously, furthermore, the cleaning group and 15 opening according to the invention shows a minor compressed air consumption, since the cleaning cycle has a very short duration. For example, some tests carried out by the Applicant have highlighted that a cleaning cycle, in which the cleaning tube goes from 20 upper limit position to the limit position lower and returns to the upper limit position, has an average duration of about 10 seconds, while analogous cycle, performed by known devices has a duration of about 25 seconds. 25 Since the compressed air is blown only during the cycle cleaning, which also translates into lower consumption of compressed air and therefore a reduction in consumption energetic. It is clear that a technician in the field, in order to satisfy 5 contingent needs, could make changes to the cleaning and opening group described above, all contained within the scope of protection as defined by the following claims.

Claims

1. Cleaning and opening assembly (70) for a spinning line for dirty tubes (12) provided with residual sections (R; R1,R2) of wick, comprising - a cleaning tube (72) which extends mainly along a vertical central tube axis (W), insertable onto the dirty tube (12), suitable for being fluidly engaged with air suction means to create an air suction flow (Fa) inside it; - an opening assembly (90), applied to the cleaning tube (72), configured to intercept the entire passage section of the air suction flow inside the cleaning tube (72) and arranged, in an operating configuration in which the cleaning tube (72) engages the dirty tube (12), downstream of said dirty tube (12);wherein the opening assembly (90) comprises at least one outlet duct (94) passable by fibre flakes and / or wick fractions, a septum (92) permeable to air and configured to create a constriction for the intake air flow (Fa) and to convey the wick or fibre flakes and / or wick fractions towards the opening duct (94), and a plurality of primary blowing holes (99) for the forced admission of primary air jets into the outlet duct (94) for the flaking of the wick into fibre flakes and / or wick fractions.; 2. Cleaning and opening group according to claim 1, wherein the septum (92) comprises a septum wall (98) annular with respect to the central axis of the tube (W), provided with a plurality of calibrated openings (100) which pass through it and make it permeable to air and substantially impermeable to fibre flakes and / or wick fractions.

3. Cleaning and opening assembly according to claim 2, wherein the septum wall (98) is convergent towards the outlet duct (94).

4. Cleaning and opening assembly according to claim 3, wherein the septum wall (98) is truncated conical towards the outlet duct (94).

5. Cleaning and opening assembly according to any of the preceding claims, wherein said primary blowing holes (99) are configured so that the primary air jets introduced into the opening duct (94) are directed upwards.

6. Cleaning and opening group according to any of the preceding claims, comprising a shank (102) fixed to the septum (92), axially crossed by the outlet duct (94) and provided with said primary blowing holes (99) which open into the outlet duct (94).

7. Cleaning and opening assembly according to any of the preceding claims when dependent on claim 4, wherein the outlet duct (94) is coaxial with the truncated cone-shaped septum wall (98).

8. Cleaning and opening assembly according to any of the preceding claims, comprising air suction means operable to achieve the air suction current inside the cleaning tube (72).

9. A cleaning and opening assembly according to claim 8, wherein the air suction means comprises a fan operatively connected to an upper end (74u) of a tube wall (74) of the cleaning tube (72).

10. Cleaning and opening assembly according to any of the preceding claims, comprising second air blowing means adapted to forcibly blow a plurality of second air jets around the dirty tube (12).

11. Cleaning and opening group according to claim 10, wherein said second air jets are orthogonal to the central axis of the tube (W).

12. Cleaning and opening assembly according to any of the preceding claims, comprising actuation means configured to support and translate the cleaning tube (72) along the central tube axis (W).

13. Assembly for a spinning line (1) comprising: - a device (50) for taking dirty tubes (12) from a secondary transport device (26) and bobbins (10) from a main transport device (22), exchanging the bobbins (10) with empty tubes (14) and releasing the bobbins (10) to the secondary transport device (26) and the empty tubes (14) to the main transport device (22); - a cleaning and opening assembly (70) according to any of the preceding claims, for cleaning the dirty tubes (12) and obtaining the empty tubes (14).

14. Method for cleaning dirty tubes (12) provided with residual sections (R; R1,R2) of wick and for opening the wick (70), comprising the following steps: - in a cleaning tube (72) inserted on the dirty tube (12), cause a suction air current (Fa); - by means of an air-permeable septum (92) configured to retain fibre flakes and / or wick fractions, cause a constriction of the suction air current (Fa) downstream of the dirty tube (12); - channelling the ends of the residual sections (R,R1,R2) of the wick into an outlet duct (94) downstream of the 5th constriction of the suction air current; - forcibly introducing primary air jets into the outlet duct (94); thus causing the opening of the wick, i.e. the flaking into fibre flakes and / or wick fractions.