EP3719185A1

EP3719185A1 - Spinning unit of a rotor spinning machine and a component of the spinning unit

Info

Publication number: EP3719185A1
Application number: EP20161800.6A
Authority: EP
Inventors: Vitezslav Kubes; Jiri Storek; Martin Rehak; Vladimir Kubovy
Original assignee: Maschinenfabrik Rieter AG
Current assignee: Maschinenfabrik Rieter AG
Priority date: 2019-03-28
Filing date: 2020-03-09
Publication date: 2020-10-07
Also published as: CN111748879B; CN111748879A; CZ2019187A3

Abstract

The invention relates to a spinning unit of a rotor spinning machine comprising an opening roller (20) arranged in a cavity (21) of an opening device (2), whereby between the surface of the circumference of the opening roller (20) and the circumferential wall (23) of the cavity (21) of the opening device (2), a transport channel (22) of opened fibers is formed, into which in the direction (X) of the rotation of the opening roller (20) opens a fiber sliver inlet opening (230), a cleaning opening (231), which is followed by a channel (24) for removing trash from the transport channel (22), and a fiber outlet opening (232) which is followed by a fiber outlet channel (25) to a chamber (3) of a spinning rotor. The circumferential wall (23) of the cavity of the opening device (2) completely surrounds the cavity (21) of the opening device (2), whereby only in the area of the cleaning opening (231) and/or of the outlet opening (232) it is formed by a front wall (60,70) of a body (6, 7) which is removably and tightly inserted into a gap (26, 27) in the circumferential wall (23), wherein the front wall (60, 70) of the body (6, 7) at its front and rear ends (600, 601, 700, 701) is connected to the adjacent fixed parts (233, 234, 235, 236) of the circumferential wall (23) of the opening device (2).

Description

Technical field

The invention relates to a spinning unit of a rotor spinning machine comprising an opening roller arranged in a cavity of an opening device, whereby between the surface of the circumference of the opening roller and the circumferential wall of the cavity of the opening device, a channel for the transport of opened fibers is formed, into which a fiber sliver inlet opening opens in the direction of the opening roller rotation, a cleaning opening, which is connected to a channel for removing trash from the transport channel, and a fiber outlet opening, which is connected by a fiber outlet channel to a chamber of a spinning rotor.
In addition, the invention relates to a component of the spinning unit.

Background art

CZ 286 088 discloses a spinning unit of a rotor spinning machine, which comprises an opening roller arranged in a cavity of the spinning unit body. Between the surface of the circumference of the opening roller and the inner surface of the cavity of the body, is formed a transport channel of opened fibers which are opened by the opening roller from a sliver supplied by a sliver feeding device, whereby the opened fibers are transported by the opening roller along a trash removal channel as far as to the mouth of the feeding channel of the opened fibers to the spinning rotor. The inner surface of the cavity of the spinning unit body surrounds the opening roller and together with the opening roller constitutes a transport channel. The inner surface of the cavity is in the section from the sliver feeding device as far as behind the fiber feeding channel into the spinning rotor formed on the front side of a pair of bodies which are replaceably mounted on the spinning unit body. These bodies, in particular in the direction from the sliver feeding device, first a guiding body with the trash removal channel and then a separating body with the feeding channel of opened fibers to the spinning rotor, situated downstream of the guiding body, are known as such, for example, from CZ UV 5537, CZ UV 5599, CZ 299259 and others.
The disadvantage of these solutions is that formation of such a fiber transport channel, wherein the entire respective part of the wall surrounding the opening roller and the corresponding channel are formed in removable bodies, places high demands on material. Since the leading edges of the channels are exposed to the greatest wear and the other parts of the respective body have a much longer service life, the replacement of the respective body is materially and time consuming. Furthermore, it is equally disadvantageous if it is necessary to change the size and/or the shape and/or the profile of the respective channel in the respective body, because the size and/or the shape and/or the profile of the channel is highly dependent on the fiber material being processed and its purity upon entering the spinning unit. Finally, replacement of the known spinning unit bodies requires a relatively large mounting space with respect to the dimensions of the spinning unit.
The object of the invention is therefore to eliminate or at least reduce the disadvantages of the background art.

Principle of the invention

The object of the invention is achieved by a spinning unit of a rotor spinning machine, whose principle consists in that the circumferential wall of a cavity of an opening device completely encloses the cavity of the opening device, whereby only in the area of a cleaning opening and/or an outlet opening it is formed by a front wall of a body which is removably and tightly inserted into a gap in the circumferential wall, wherein the front wall of the body, at its front and rear ends, is connected to the adjacent fixed portions of the circumferential wall of the opening device.
This solution allows easy, time-saving and inexpensive replacement of the body either to restore the characteristics of the spinning unit or to adjust or change the characteristics of the spinning unit depending on the material being processed, its purity, density, the length of individual fibers, etc.
To facilitate replaceability and interchangeability, the body has a lower and upper surfaces which stay in alignment with the adjacent components of the spinning unit, wherein the side surfaces of the body by which the body abuts the adjacent surfaces of the body of the opening device are in the region of the circumferential wall of the opening device situated relative to the opening roller in the direction of chords or radials.
In order to form the whole oblique channel in the body, it is advantageous if the rear lateral surface is spaced from the circumferential wall of the opening device from the originally chord or radial direction relative to the opening roller and diverted away from the central part of the body to provide space for the whole oblique channel.
To facilitate deep positioning of the body relative to the other parts of the spinning unit, the body is provided with abutment edges on its rear side along its height.
From the point of view of easy access to the mutually interchangeable bodies in the spinning unit, it is advantageous if to the opening device are assigned at least two bodies having the same outer dimensions and the same outer shape and having a different size and/or shape of the cleaning or outlet opening or two bodies having a different size, shape, cross-section, channel inclination and/or having a different surface finish and/or made of a different material.
From the material and production point of view, it is advantageous according to one embodiment if the body has an angular length of the front wall in the range of 15° to 80°.
It is also advantageous from the material and production point of view if the total size of the area of the cleaning or outlet opening of the body is in the range from 20 % do 80 % of the total area of its front wall.
According to one embodiment, the opening of the body has a front edge which is arranged at the level of the front side of the body and at the same time it is situated at an angular distance from the front end of the front wall of the body. This is particularly advantageous for processing fibrous materials with a low trash content.
According to another embodiment, the opening of the body has a front edge which is arranged at the level of the front end of the front side of the body and at the same time is situated at the front end of the front side of the body at zero angular distance from the front end of the front side of the body, which is particularly advantageous for more effective trash removal from fibrous materials.
According to yet another embodiment, the opening of the body has a front edge which is disposed at a distance from the level of the front wall of the body and at the same time at a distance from the level of the front end of the front wall of the body, forming a step extension of the channel. This is particularly advantageous for increased trash removal from fibrous materials having a high trash content.
It is advantageous if the body is a cleaning body or an output body.
The principle of a component of a spinning unit of a rotor spinning machine in the form of a separately supplied component, for example a spare part or an accessory part, consists in the fact that it is formed by a body which is adapted to be removably and tightly inserted into a gap in the circumferential wall, whereby the front wall of the body is at its front and rear ends adapted to join the adjacent fixed portion of the circumferential wall of the opening device. In this case, it is advantageous if the component consists of a cleaning body or an output body.

Description of the drawings

The invention is schematically represented in the drawing, wherein Fig. 1 shows an arrangement of the spinning unit according to one embodiment of the invention, Fig. 2 shows an arrangement of the spinning unit according to an embodiment of the invention with a removed opening roller, Fig. 3 shows an exploded view of an arrangement of the spinning unit according to one embodiment of the invention; Fig. 4 shows an example of the cleaning body according to the invention; Fig. 5 shows an example of the output body according to the invention; Fig. 6a is a plan view of another embodiment of the body according to the invention;

Examples of embodiment

A rotor spinning machine comprises at least one row of identical workstations, whereby each workstation comprises a spinning unit in which yarn is formed from a supplied sliver, the yarn being withdrawn from the spinning unit or from the spinning rotor by a draw-off tube 4 and wound onto a bobbin.
The spinning unit comprises a sliver feeding device 1, which is assigned to an opening device 2 of fibers. The opening device 2 serves to open the fibers from the sliver as well as to transport the opened fibers to a chamber 3 of the spinning rotor.
The sliver feeding device 1 comprises a feeding roller 10 coupled to a drive and an unillustrated sliver feeding table, also called a sliver condenser, assigned to a feeding roller 10.
The opening device 2 comprises an opening roller 20, which is rotatably mounted in a cavity 21 created in the body of the spinning unit. The cylindrical surface of the opening roller 20 is provided with an unillustrated working cover consisting of teeth or needles by which the individual fibers are pulled from the sliver in the area of the sliver feeding device 1 and are conveyed to the chamber 3 of the spinning rotor through a transport channel 22 formed by the circumferential wall 23 of the opening device 2 around the cylindrical working cover of the opening roller 20.
The cavity 21 of the opening device 2 may be from the upper side closed by an unillustrated lid, e.g., by a lid of the spinning unit or a separate lid, etc.
A sliver feeding opening 230 into the opening device 2 is formed in the circumferential wall 23 of the opening device 2, in the area of the sliver feeding device 1.
In the direction X downstream of the inlet opening 230, a cleaning opening 231 is formed in the peripheral wall 23 of the opening device 2, which opens into a channel 24 for removing trash from the transport channel 22, i.e. the trash released from the fibers by opening by the opening roller 20 and by the transport of these fibers through the transport channel 22 to the chamber 3 of the spinning rotor. The trash removal channel 24 from the transport channel 22 opens into a vacuum channel 5, which is connected in a known manner to an unillustrated source of vacuum.
In the direction X downstream of the cleaning opening 231, a fiber outlet opening 232 is formed in the circumferential wall 23 of the opening device 2. The fiber outlet opening 232 opens into an outlet channel 25 of the opened and trash-free fibers to the chamber 3 of the spinning rotor.
The circumferential wall 23 of the opening device 2 continues along the opening roller 20 as far as to the inlet opening 230 of sliver in the direction X downstream of the fiber outlet opening 232. Thus, the entire circumference of the opening roller 20 is surrounded by the circumferential wall 23 of the opening device 2 with the respective openings 230, 231, 232.
The cleaning opening 231, together with the trash removal channel 24 from the transport channel 22, is formed in a separate cleaning body 6, which is tightly inserted into the gap 26 in the circumferential wall 23, whereby the front wall 60 of the cleaning body 6 forms in this inserted position a part of the circumferential wall 23 of the opening device 2. At its front and rear ends 600, 601, the circumferential wall 23 smoothly joins the adjacent fixed parts 233, 234 of the circumferential wall 23 of the opening device 2. The cleaning body 6 is secured, e.g. with a screw, to the body of the spinning unit. The lower and upper surfaces 602, 603 of the cleaning body 6 stay in alignment with the adjacent components of the spinning unit, i.e. the body of the unit and the lid of the opening device 2. The lateral surfaces 604, 605 of the cleaning body 6 by which the cleaning body 6 abuts the adjacent surfaces of the body of the spinning unit are in the region away from the circumferential wall 23 of the opening device 2 situated in chord or radial direction relative to the opening roller 20, whereby, in Fig. 3, the rear lateral surface 605 is at a distance from the circumferential wall 23 of the opening device 2 deflected from the originally chord or radial direction relative to the opening roller 20 away from the central part of the cleaning body 6, thereby creating a space in the volume of the cleaning body 6 for accommodating the whole oblique trash removal channel 24 in the cleaning body 6, with the desired dimensions and geometry of the trash removal channel 24. On the rear side of the cleaning body 6, along the height of the cleaning body 6, are arranged abutment edges 61, which determine the extent of insertion of the cleaning body 6 into the gap 26 and thereby also the position of the cleaning body 6 and its front wall 60 relative to the other parts of the opening device 2. Due to its front wall 60, rear wall, lateral surfaces 604, 605 and lower and upper surfaces 602, 603, the cleaning body 6 has precisely the desired shape and dimensions which allow the cleaning body 6 to be repeatedly removed from and inserted into the opening device 2. The size and shape of the cleaning opening 231 and the size, shape, cross-section and inclination of the trash removal channel 24 formed in the cleaning body 6 are determined by the characteristics of the fibrous material being processed.
Preferably, at least two cleaning bodies 6 are assigned to one spinning unit, whereby the two cleaning bodies 6 have the same outer dimensions and the same outer shape, but differ in the size and/or shape of the cleaning opening 231 and/or the two cleaning bodies 6 differ in size, cross-section, inclination of the trash removal channel 24 and/or the two cleaning bodies 6 have a different finish and/or the two cleaning bodies 6 are made of a different material. Since such a cleaning body 6 is relatively small and manufactured with sufficient precision, it is also easily replaceable not only with a new, unworn cleaning body with the same cleaning opening 231 and with the same trash removal channel 24, but, in case of need, it can be replaced with a cleaning body 6 with a different cleaning opening 231 and/or a different trash removal channel 24 and/or with a cleaning body 6 with a different finish and/or made of a different material. The outer dimensions and the shape of the cleaning body 6 are always the same. These additional cleaning bodies 6 constitute the accessories of the spinning unit for different types of the fibrous material being processed and/or materials with different trash content. The circumferential angle α of the front wall 60 of the cleaning body 6 is in the range from 20 ° to 45°. The total surface area of the cleaning opening 231 constitutes 20 to 80 % of the total area of the front wall 60 of the cleaning body 6.
As shown in Fig. 6a, the front edge 2310 of the cleaning opening 231 is arranged at the level of the front wall 60 of the cleaning body 6 and at the same time it is situated at an angular distance α₁ form the front end 600 of the front wall 60 of the cleaning body 6.
As shown in Fig. 6b, the front edge 2310 of the cleaning opening 231 is arranged at the level of the front wall 60 of the cleaning body 6 and at the same time it is situated at the level of the front end 600 of the front wall 60 of the cleaning body 6, so that the angular distance α₁ according to Fig. 6b equals 0 (zero).
As shown in Fig. 6c, the front edge 2310 of the cleaning opening 231 is arranged at a distance Z from the level of the front wall 60 of the cleaning body 6 and at the same time also at a distance from the level of the front end 600 of the front wall 60 of the cleaning body 6, thereby forming here a step extension of the trash removal channel 24.
In the exemplary embodiment shown, also the fiber outlet opening 232 and the outlet channel 25 of the opened trash-free fibers are provided in a separate output body 7, which is tightly inserted into the gap 27 in the circumferential wall 23, whereby the front wall 70 of the output body 7 forms in this inserted position a part of the circumferential wall 23 of the opening device 2, which by its ends 700, 701 is smoothly connected to the adjacent fixed parts 235, 236 of the circumferential wall 23 of the opening device 2. The output body 7 is secured, e.g., with a screw, to the body of the spinning unit. The lower and upper surfaces 702, 703 of the output body 7 stay in alignment with the adjacent parts of the spinning unit, i.e. with the body of the unit and the lid of the opening device 2. The lateral surfaces 704, 705 of the output body 7, by which the output body 7 abuts the adjacent areas of the body of the spinning unit are in the area away from the circumferential wall 23 of the opening device 2 situated relative to the opening roller 20 in the chord and radial direction, whereby, in Fig. 3, the rear lateral surface 705, at a distance from the circumferential wall 23 of the opening device 2, continues in the form of the walls of the oblique fiber outlet channel 25 formed in the volume of the output body 7, with the desired dimensions and geometry of the fiber outlet channel 25. Abutment edges 71 are arranged on the rear side of the output body 7 along the height of the output body 7. The abutment edges 71 determine the extent of insertion of the output body 7 into the gap 27 and thereby also the position of the output body 7 and its the front wall 70 relative to the other parts of the opening device 2. Due to its front wall 70, rear wall, lateral surfaces 704, 705 and lower and upper surfaces 702, the output body 7 has 703 exactly the desired shape and dimensions which allow the output body 7 to be repeatedly removed from and inserted into the opening device 2. The size and shape of the outlet opening 232 and the size, shape, cross-section and inclination of the fiber outlet channel 25 in the output body 7 are determined by the characteristics of the processed fibrous material.
Preferably, at least two outlet bodies 7 are assigned to one spinning unit, whereby the outlet bodies 7 have the same outer dimensions and the same outer shape, but differ in size and/or shape of the outlet opening 232 and/or the output bodies 7 differ in size, shape, cross-section, inclination of the fiber outlet channel 25 and/or the outlet bodies 7 have a different finish and/or are made of a different material. Since this output body 7 is relatively small and manufactured with sufficient precision, it is also easily replaceable not only with a new, unworn output body 7 with the same outlet opening 232 and the same fiber outlet channel 25, but, if necessary, it is replaceable also with an output body 7 with a different outlet opening 232 with an output body 7 with a different fiber outlet channel 25 or with an output body 7 with a different finish or with an output body 7 made of a different material. The outer dimensions and shape of the output body 7 are always the same. These additional output bodies 7 then constitute the accessories of the spinning unit for different types of the fibrous material being processed. The angular length β of the front wall 70 of the output body 7 is in the range from 15° to 30°. The total surface area of the outlet opening 232 constitute 20 to 80 % of the total area of the front wall 70 of the output body 7.
In the illustrated embodiments, the front edge 2320 of the outlet opening 232 is arranged at the level of the front wall 70 of the output body 7 and at the same time it is situated at an angular distance β1 from the front end 700 of the front wall 70 of the output body 7.
In an embodiment (not shown), the front edge 2320 of the outlet opening 232 is disposed at the level of the front wall 70 of the output body 7 and at the same time it is situated at the level of the front end 700 of the front wall 70 of the output body 7 so that the angular distance β1 equals 0 (zero).
In another embodiment (not shown), the front edge 2320 of the outlet opening 232 is arranged at a distance from the level of the front wall 70 of the output body 7 and at the same time at a distance from the front end 700 of the front wall 70 of the output body 7, thereby forming a step extension of the fiber outlet channel 25.
In an exemplary embodiment (not shown), the spinning unit is provided only with the replaceable cleaning body 6 according to the present invention, and the fiber outlet opening 232 and the fiber outlet channel 25 are solved in a different manner and by other means. In another embodiment (not shown), the spinning unit is provided only with the replaceable output body 7 according to the invention, and the cleaning opening 231 and the trash removal channel 24 are solved in a different way and by other means.

List of references

1: sliver feeding device
10: sliver feeding roller
2: opening device
20: opening roller
21: cavity
22: transport channel
23: circumferential wall
230: sliver inlet opening
231: cleaning opening
2310: front edge of the cleaning opening
232: outlet opening of fibers
2320: front edge of the output body
233: fixed part of the circumferential wall
234: fixed part of the circumferential wall
235: fixed part of the circumferential wall
236: fixed part of the circumferential wall
24: trash removal channel
25: sliver outlet opening
26: gap in the circumferential wall
27: gap in the circumferential wall
3: chamber of the spinning rotor
5: vacuum channel
6: cleaning body
60: front wall of the cleaning body
600: front end of the front wall of the cleaning body
601: rear end of the front wall of the cleaning body
602: lower surface of the cleaning body
603: upper surface of the cleaning body
604: lateral surface of the cleaning body
605: lateral surface of the cleaning body
61: abutment edge of the cleaning body
7: output body
70: front wall of the output body
700: front end of the front wall of the output body
701: rear end of the front wall of the output body
702: lower surface of the output body
703: upper surface of the output body
704: lateral surface of the output body
705: lateral surface of the output body
71: abutment edge
α: circumferential angle of the front wall of the cleaning body
α₁: angular distance of the front edge of the cleaning opening od of the front end of the front edge of the cleaning body
β: circumferential angle of the front wall of the output body
β₁: angular distance of the front edge of the outlet opening of the front end of the front wall of the output body
X: direction of rotation of the opening roller
Z: distance of the front edge of the cleaning opening from the level of the front wall of the cleaning body

Claims

A spinning unit of a rotor spinning machine comprising an opening roller (20) arranged in a cavity (21) of an opening device (2), whereby between the surface of the circumference of the opening roller (20) and the circumferential wall (23) of the cavity (21) of the opening device (2), a channel (22) for the transport of opened fibers is formed, into which in the direction (X) of the opening roller (20) rotation opens a fiber sliver inlet opening (230), a cleaning opening (231), which is connected to a channel (24) for removing trash from the transport channel (22), and a fiber outlet opening (232) which is connected to a fiber outlet channel (25) to a chamber (3) of a spinning rotor, characterized in that the circumferential wall (23) of the cavity of the opening device (2) completely surrounds the cavity (21) of the opening device (2), whereby only in area of the cleaning opening (231) and/or of the outlet opening (232) it is formed by a front wall (60,70) of a body (6, 7) which is removably and tightly inserted into a gap (26, 27) in the circumferential wall (23), wherein the front wall (60, 70) of the body (6, 7) at its front and rear ends (600, 601, 700, 701) is connected to the adjacent fixed parts (233, 234, 235, 236) of the circumferential wall (23) of the opening device (2).
The spinning unit according to claim 1, characterized in that the body (6,7) has a lower and an upper surfaces (602, 603, 702, 703) aligned with adjacent components of the spinning unit, whereby side surfaces (604, 605, 702, 703) of the body (6, 7) by which the body (6, 7) abuts the adjacent surfaces of the body of the opening device (2) are in the area away from the circumferential wall (23) of the opening device (2) situated in the direction of chords or radials to the opening roller (20).
The spinning unit according to claim 2, characterized in that the rear side surface (605, 705) of the body (6, 7) is at a distance from the circumferential wall (23) of the opening device (2) deflected from the initially chord or radial direction to the opening roller (20) from the central part of the body (6, 7) to provide space for accommodating the entire inclined channel (24, 25).
The spinning unit according to any of claims 1 to 3, characterized in that the body (6, 7) is on its rear side and along its height provided with abutment edges (61, 71).
The spinning unit according to any of claims 1 to 4, characterized in that to the opening device (2) are assigned at least two bodies (6, 7) which have the same outer dimensions and the same outer shape and which have a different size and/or shape of the cleaning or outlet opening (231, 232) and/or which have a different size, shape, cross-section, inclination of the channel (24, 25) and/or which have a different surface finish and/or which are made of a different material.
The spinning unit according to any of claims 1 to 5, characterized in that the body (6, 7) has an angular length α of the front wall in the range of 15° to 80°.
The spinning unit according to any of claims 1 to 6, characterized in that the body (6, 7) has a total area of the cleaning or outlet opening in the range of 20 % to 80 % of the total area of its front wall.
The spinning unit according to any of claims 1 to 7, characterized in that the opening (231, 232) of the body (6, 7) has a front edge (2310, 2320) which is arranged at the level of the front wall (60, 70) of the body (6, 7) and at the same time is situated at an angular distance (α₁, β₁) from the front end (600, 700) of the front wall (60, 70) of the body (6, 7).
The spinning unit according to any of claims 1 to 7, characterized in that the opening (231, 232) of the body (6, 7) has a front edge (2310, 2320) which is arranged at the level of the front wall (60, 70) of the body and at the same time is situated at the level of the front end (600, 700) of the front wall (60, 70) of the body (6, 7) at zero angular distance (α₁, β₁) from the front end (600, 700) of the front wall (60, 70) of the body (6, 7).
The spinning unit according to any of claims 1 to 7, characterized in that the opening (231, 232) of the body (6, 7) has a front edge (2310, 2320) which is spaced from the level of the front wall (60, 70) of the body (6, 7) and at the same time is spaced from the level of the front end (600, 700) of the front wall (60, 70) of the body (6, 7) and forms a step extension of the channel (24,25).
The spinning unit according to any of claims 1 to 10, characterized in that the body (6, 7) is formed by a cleaning body (6).
The spinning unit according to any of claims 1 to 11, characterized in that the body (6, 7) is formed by an output body (7).
A component for the spinning unit of a rotor spinning machine according to any of claims 1 to 12, characterized in that it is formed by a body (6, 7) which is adapted to be removably and tightly inserted into a gap (26, 27) in the circumferential wall (23), whereby the front wall (60, 70) of the body (6, 7) is at both its front end and rear end (600, 601, 700, 701) adapted to be continuation of an adjacent fixed part (233, 234, 235, 236) of the circumferential wall (23) of the opening device (2).
The component of a spinning unit of a rotor spinning machine according to claim 13, characterized in that it is formed by a cleaning body (6).
The component of a spinning unit of a rotor spinning machine according to claim 13, characterized in that it is formed by an output body (7).