CN102995169A - Apparatus at a flat card or roller card having a clothed cylinder and at least one adjacent clothed doffer - Google Patents

Abstract

The invention is a device with a clothing cylinder and at least one adjacent clothing doffer. In a device located on a flat card or a roller card, the device has a clothing cylinder, at least one adjacent clothing doffer and a stripping roller, which cooperate with each other and have an intermediate cylindrical surface at the fiber transfer position. small mutual distance between them (working distance), the device has side parts (side screens) arranged at both ends of the cylinder and fixedly mounted on the frame, provided with shifting devices for the doffer To use the setting device to set the predetermined working distance. In order to keep the working gap between the doffer and the cylinder and between the doffer and the stripping roller substantially constant in any operating state by means of a device of simple construction, in order to set the working gap, the side parts of the cylinder are passed through At least one force transmission means is coupled to the holding element for the doffer, and mechanical means are associated with the holding element and the holding device for the stripping roller, by means of which a working distance between the doffer and the stripping roller can be set.

Description

Device with clothing cylinder and at least one adjacent clothing doffer

technical field

The invention relates to a device on a flat card or a roller card with a clothing cylinder, at least one adjacent clothing doffer and stripping rollers, which cooperate with each other and are in the form of a cylinder at the fiber transfer position The surfaces have a small mutual spacing (working spacing); the device has side parts (side screens) arranged at both ends of the cylinder and fixedly mounted on the frame; and has a displacement for the doffer The device uses the setting device to set a predetermined working distance.

Background technique

In modern high-performance cards, the heating of the components and the associated changes in the component spacing are becoming more and more important factors, and the same is true for the spacing between cylinder and doffer. In order to obtain good quality at maximum throughput, this spacing must be kept as constant as possible. However, the continued increase in production in the new generation of cards also leads to a more pronounced difference between the roller gap at a cold setting and the roller gap in a warmed state. For example, in the case of polyester processing, it can now sometimes happen that the cold setting necessary to have an optimal roller gap when the machine gets hot is so large that it is unlikely to start without problems spinning. Also, the technical effect during the "warm-up phase" is significantly worse than when the machine is completely warmed up.

When carding, larger quantities of fiber material are processed per unit time, which leads to higher speeds and higher plant capacity for the working elements. An increase in the throughput (yield) of fibrous material leads to increased heating due to mechanical work even when the working surface area remains constant. At the same time, however, technical carding results (sliver consistency, cleanliness, nep reduction, etc.) continue to improve, which leads to more working surfaces in the carding engagement and to these working surfaces - e.g. stationary card flats and/or rotary card flats - closer to the cylinder (drum). The proportion of synthetic fibers being processed continues to increase: When in contact with the machine's working surface (card clothing), these fibers - compared to cotton - generate more heat due to friction. Currently, the working elements of high-performance cards are fully enclosed on all sides to meet high safety standards, prevent the discharge of particles into the spinning space environment, and minimize the maintenance needs of the machines. Grilles that allow air circulation or even exposed material delivery surfaces are largely a thing of the past. Due to the mentioned circumstances, the heat input into the machine is significantly increased, while the heat removal by convection is significantly reduced. The resulting greater heating of high-performance cards leads to greater thermoelastic deformations, which affect the set spacing of the working surfaces due to the uneven distribution of the temperature field: in cylinders with flats, doffers, stationary cards The distance between the cover plate and the removal position is reduced. In the limit case, the gap set between the working surfaces can be completely consumed by thermal expansion, causing the relatively moving parts to collide. The consequence is thus a major damage to the high performance carding machine. In conclusion, given the very large temperature differences between the components, heating in the working area of the card can especially lead to different thermal expansions.

The distance between carding nip and roller is particularly important in carding machines. The carding quality fluctuates through the precise setting of these gaps (roller nips). Under the influence of heat, the rollers expand and the gap changes. In addition to the expansion of the rollers due to centrifugal force, which greatly changes the gap, the high throughput and densely carded synthetic fibers further cause significant heating of the rollers, resulting in thermally induced dimensional changes of the rollers. In order to obtain the best carding quality it is necessary that the roller spacing remains constant during operation. In this case, "constant" means that the pitch should preferably vary by less than 0.01 mm.

In the case of the known device (EP 1 300 494B), the delivery module has a support. The axis of rotation of the doffer is fixedly arranged in the associated bearing. The support has an axis of rotation connecting the support to the base plate of the frame. The bearing is rotatable about an axis between a ready position and a working position. In the working position of the conveying module, the doffer has a predetermined spacing (working gap) relative to the drum in the conveying position. Movement of the module about the axis of rotation is achieved by actuation of the joystick between the axis and a corresponding set position remote from the axis of rotation. In this setting position, an adjustment mechanism (setting device), such as a screw, is provided. Any kind of adjusting element can be arranged between the bearing on the machine frame and the fixed stop. The support structure for the drum comprises the aforementioned base plate and extends over the entire working width from side to side. At each end, a pair of support legs is fixed and each pair supports a respective mounting plate holding a mount for the drum shaft. In the case of this device, the predetermined working distance between the drum and the doffer is set once before operation using an adjustment mechanism (setting device) and maintained during operation. The working gap is set slightly larger in the cold state and decreases to the desired size as the temperature of the drum and adjacent rollers increases. A disadvantage lies in the fact that the working gap is too large in the cold state of the machine and only reaches the desired value when it warms up. When a carding machine has to be run from standstill to a certain speed in order to process a particular batch of fiber batts, the temperature of the different parts of the machine is continuously varied at some stage until finally a steady, or constant state (operating temperature) is reached. The "transition" period of these temperature changes is much longer than the actual period of operation to a certain speed. Thermal equilibrium is achieved, for example, only after 1 to 5 hours. This means that the quality of the card sliver is poor during the warming up phase. In addition, the manufacturing process must be very precise. The set working gap thus differs in the cold and warm state of the machine. This difference occurs even more significantly when processing different fiber materials such as cotton or synthetic fibres.

The doffer cooperates with a stripping roller arranged downstream in the working direction. When the distance between the doffer and the cylinder is adjusted by means of the adjusting device, it can happen that the distance between the doffer and the stripping roller is similarly adjusted in an undesired manner.

Contents of the invention

It is therefore the problem of the present invention to provide a device of the type described at the outset, which avoids the mentioned disadvantages, is particularly simple in terms of construction and makes it possible, on the one hand, to convert between doffer and tin in any operating state. The working gap between the forests, on the other hand, keeps the working gap between the doffer and the stripping roller substantially constant.

This problem is solved by the specific features of claim 1 .

Due to the measures according to the invention it is possible to keep the roller spacing constant in the card by means which are simple in terms of construction. According to the invention, there are shifting devices for adjacent rollers which can be put into action by means of force transmission means, such as mechanical couplings, in order to adjust the working distance between cylinder and doffer roller in case of changing conditions held constant.

The distance between the cylinder and the doffer is set at the force transmission means, for example a setting mandrel. In the process, the doffer pivots about a pivot point and mounting and changes its position relative to the holding device for the stripping roller or web removal. The distance between the doffer and the stripping roller is set by mechanical means such as adjustable slides or adjustable coupling rods. The holding elements for the stripping rollers or web pickers are preferably supported against the slides by means of slides.

The slideway is advantageously configured such that the set distance remains constant even in the event of movement of the doffer. Advantageously, the coupling rod keeps the set distance constant even in the event of movement of the doffer.

Claims 2 to 19 comprise advantageous developments of the invention.

Description of drawings

The invention is described in more detail hereinafter with reference to examples of embodiment shown in the accompanying drawings, in which:

Figure 1 shows a flat card for a device according to the invention in a schematic side view;

Figure 1a shows the working distance according to Figure 1 between the wires of the cylinder and the wires of the stripping rollers;

FIG. 1 b shows the working distance according to FIG. 1 between the wires of the doffer and the wires of the stripping rollers;

Figure 2 shows in side view the part of the cylinder and the side screen of the doffer connected by a threaded mandrel, the doffer and its associated side screen being able to pivot about a swivel mount;

Figure 3 shows the slides associated with the side screens of the doffer and the slides associated with the holding means of the stripping rollers (web removal);

Figure 3a shows in detail the cooperation between the slider and the slideway according to Figure 3; and

Figure 4 shows a coupling rod whose one end area is rotatably articulated to the side screen of the doffer and whose other end area is rotatably articulated to the holding device for the stripping roller (web removal element) connected.

Detailed ways

Figure 1 shows a card, for example a Trützschler flat card TC, with a feed roller 1, a feed table 2, licker-in rollers 3a, 3b, 3c, a cylinder 4, a doffer 5 , stripping roller 6, clamping rollers 7, 8, web guide elements 9, bar funnel 10, delivery rollers 11, 12, rotary card top 13 with card top guide rollers 13a, 13b, cover plate 14, can 15 and ring strip 16. The direction of rotation of the rollers is indicated by the curved arrows. Reference character M ₁ designates the center point (axis) of the cylinder 4 , reference character M ₂ designates the center point of the doffer 5 , and reference character M ₃ designates the center point of the stripping roller 6 . Reference numeral 4a designates the card clothing, while reference numeral 4b designates the direction of rotation of the cylinder 4 . Reference numeral 5a designates the card clothing, while reference numeral 5b designates the direction of rotation of the doffer 5 . Reference sign B indicates the direction of travel of the rotary card top 13 in the carding position, reference sign C indicates the direction of return transport of the card flat 14 and reference signs 17 ′, 17 ″ designate stationary functional elements. Arrow A Indicates the direction of work.

In Figure 1a, the reference a indicates the working distance between the wire 4a of the cylinder 4 and the wire 5a of the doffer 5, while the reference b indicates the distance between the wire 5a of the doffer 5 and the stripping roller 6. The working distance between the clothings 6a.

According to FIG. 2 , the side screen 18 a of the cylinder 4 and the side screen 19 a of the doffer 5 are coupled together via a threaded spindle 21 a (setting spindle). One of the ends of the threaded mandrel 21a is supported on a flange 22a, a stop, etc. on the side screen 18a, while the other end is supported on a flange 23a, a stop, etc. on the side screen 19a. . At each of its two ends, the threaded mandrel 21a has a threaded portion with which a nut is associated, while the flanges 22a and 23a each have a through hole through which the threaded portion of the threaded mandrel 21a passes. hole. There is a fixed machine frame 24 (see FIG. 3 ) on which the fixed side screen 18a is fixedly mounted. Cylinder 4 is also fixed. In addition, a swivel mount 25 around which the doffer 5 and associated side screens 19a can pivot in the direction of arrows H, I is fixed immovably to the machine frame 24 (see FIG. 3 ).

According to FIG. 3 , the doffer is mounted pivotable about a fixed point of rotation (rotation mount 25 ) located on the machine frame 24 . One end of the rotating arm 34 of the doffer 5 is connected to the spindle 21, a metal rod, or the like. This connection can be formed, for example, by means of a spherical washer (not shown), a ball socket or the like. The other end of the mandrel 21 is fixed to the side screen 18a. As the side screens 18a expand in the radial direction due to heating, the mandrel 21 deflects by substantially the same amount and thereby rotates the lever arm 34 in the direction of arrow H about the rotation point 25 . Simultaneously, the doffer 5 (and the side screen 19a with the doffer 5, see FIG. 2 ) pivots about the pivot point 25 by the same amount. As a result, the distance a between the end of the wire 4a of the cylinder 4 and the end of the wire 5a of the doffer 5 remains constant or substantially constant. Correspondingly, when the side screen 18a shrinks in the radial direction due to cooling, the doffer 5 pivots in the direction of the arrow I about the rotation point 25 . The distance a is kept constant or substantially constant. In all cases the cylinder 4 and the side screen 18a remain stationary.

The cylinders 4 and doffers 5 are provided with end-carrying clothings 4a and 5a, respectively, on their cylindrical surfaces. During the transfer of the fibers from the cylinder 4 to the doffer 5, the distance between the cylindrical surfaces of the two rollers is very important. It is possible to ensure that the rollers are in good working relationship only if the spacing a is kept within a precise and narrow tolerance range. In this arrangement, with roller diameters from about 0.20m to 1.5m and roller widths up to about 2m, optimum values for spacing a range from about 0.05mm<a<0.3mm for spacing The lower limit of a is not controlled by technical factors, but must be satisfied to avoid that the ends of the card clothings of the two rollers touch each other or interfere with each other. Otherwise, there is a risk of fire and mechanical damage to expensive end-carrying clothings. Therefore, the spacing a is small when compared with the roller size. As has been established through testing, the increase in diameter brought about by an increase in roller temperature is on the order of 0.08 mm per 10° C. temperature increase. Thanks to the device according to the invention, the optimum value for the distance a and the doffer 5 set in the cold state of the card can be maintained during operation.

According to FIG. 3 , the holding device 26 for the stripping roller 6 , which may comprise further elements for web removal such as gripping rollers 7 , 8 (see FIG. 1 ), is mounted so as to be able to rotate around a mounting 27 Rotate in the direction of arrows K and L.

At one end of the fastening rod 33 a slider 28 is adjustably mounted. Fastening rod 33 is installed on the side screen cloth 19 of doffer 5. On its side facing the doffer 5 , the holding device 26 has a slideway 29 , for example a concave curvature. The outer contour of the slider 28 , for example a convexly curved shape, comes into contact engagement with the slideway 29 (see FIG. 3 a ).

According to FIG. 4, a coupling rod 30 is provided, one end of which is rotatably hingedly connected to the side screen 19a of the doffer 5 by means of a swivel mount 31, while its other end is connected by means of a swivel mount 32 to a retainer for web removal. 26 is rotatably hingedly connected.

Claims (19)

1. Apparatus on a flat card or roller card, said device having a clothing cylinder, at least one adjacent clothing doffer and a stripping roller, said clothing cylinder, clothing doffer and stripping roller Cooperate with each other and have a small mutual spacing (working spacing) between the cylindrical surfaces at the fiber transfer position; the device has side parts (side screens); and having shifting means for said doffer to set a predetermined working distance using setting means; characterized in that, in order to set said working distance (a), said cylinder Said side parts (18a, 18b) of (4) and said holding element (19a) for said doffer (5) are connected by at least one force transmission means (21; 21a) and mechanical means (28, 29; 30) associated with said holding element (19a) and said holding device (26) for said stripping roller (6), by means of said mechanical means can be set between said doffer (5) and The working distance (b) between the stripping rollers (6). 2. The apparatus of claim 1, wherein the side screens of the cylinder are mechanically coupled to the displacement means. 3. Apparatus according to claim 1 or 2, characterized in that the side parts of the cylinder are fixedly coupled to the displacement means. 4. Apparatus according to any one of claims 1 to 3, characterized in that the side part of the cylinder is coupled to the side part of an adjacent roller. 5. Apparatus according to any one of claims 1 to 4, characterized in that the side parts of the cylinder are coupled to the displacement means by means of a spindle or the like. 6. Apparatus according to any one of claims 1 to 5, wherein the mandrel is a threaded mandrel. 7. Apparatus according to any one of claims 1 to 6, characterized in that adjacent rollers are mounted such that they can pivot about a fixed point of rotation (swivel mount) relative to a fixed cylinder. 8. Apparatus according to any one of claims 1 to 7, characterized in that the swivel point (swivel mount) is arranged on the machine frame. 9. Apparatus according to any one of claims 1 to 8, characterized in that the pivot points (rotation mounts) are arranged on the side screens. 10. Apparatus according to any one of claims 1 to 9, characterized in that the force transmission means is hingedly connected to the displacement means. 11. Apparatus according to any one of claims 1 to 10, characterized in that the force transmission means is hingedly connected to the swivel mount. 12. Apparatus according to any one of claims 1 to 11, characterized in that the force transmission means, such as a rod, arbor, etc., is articulated to the rotatable joystick element (joystick arm). 13. The equipment according to any one of claims 1 to 12, characterized in that it is used to set the work between the doffer (5) and the stripping roller (6) (network removal piece) The mechanism of spacing (b) includes a slider (28) cooperating with a slideway (29). 14. The device according to any one of claims 1 to 13, characterized in that the slideway (29) is configured such that the set working distance (b) is shifted when the doffer (5) is displaced The situation remains constant. 15. The device according to any one of claims 1 to 14, characterized in that the slideway (29) is configured in a concave and curved shape at a position in contact with the slider (28). 16. The device according to any one of claims 1 to 15, characterized in that the slider (28) is configured in a convexly curved shape at a position in contact with the slideway (29). 17. Apparatus according to any one of claims 1 to 16, characterized in that the retaining means (26) is spring-loaded against the slide (28). 18. The equipment according to any one of claims 1 to 17, characterized in that it is used to set the work between the doffer (5) and the stripping roller (6) (network removal piece) The mechanism for spacing (b) includes a coupling rod (30). 19. The equipment according to any one of claims 1 to 18, characterized in that one end of the coupling rod (30) is connected with the side screen of the doffer (5) by means of a rotating mounting part (31 ) The web (19a) is rotatably hinged, while its other end is rotatably connected to said holding device (26) for said stripping roller (6) (web removal part) by means of a swivel mount (32) Articulated.

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