JP2006507415A - Double disc seal for top roller of draft device - Google Patents

Abstract

Double disk seal for the top roller of the drafting device, each roller body (2) being rotatably supported at the end of the shaft (6) for sealing the seal disk (25) A narrow seal gap with no slip is formed on the roller body (2). The seal disc (25) is supported in the axial direction by a support member forming at least one angle ring (24). The support member (24) is configured such that another seal gap (19, 20) is placed in front of each seal gap located outside the seal disk (25) and the roller body (2). ing. With the double disc seal according to the present invention, the labor and errors associated with fabrication and assembly can be reduced.

Description

  The invention relates to a double disc seal for the top roller of a draft device of the type defined in the superordinate concept of claim 1.

  In a twin top roller or twin pressure roller provided in a drafting device of a spinning machine, the inner chamber of a roller casing having a rolling bearing is generally sealed against fiber floats from the surrounding air, for example, the German Patent It is known from published application No. 4039804 or German Patent No. 19509055. The seals shown in these specifications consist of an integral U-shaped sleeve with flanges on both sides. The known seal obtains its sealing action on the one hand from two seal gaps to the outer ring hole, formed by a flange, and on the other hand collects fibers and contaminant particles that have entered through the outer seal gap. And is obtained by a hollow chamber between the flanges which prevents further intrusion into the rolling bearing through the sealing gap located inside. Such a seal is simple and inexpensive to manufacture and incorporate. The embedding can be performed by an automated embedding device.

  For punching technical reasons, the diameter of one of the two flanges must be cut slightly smaller than the diameter of the other flange. This results in different seal gap widths. Based on manufacturing errors in diameter manufacturing and the possibility of eccentricity between the hole and the flange, in order to reliably prevent contact of the flange in the hole of the roller casing and to ensure a non-slip seal in general, Factors that increase safety in the seal gap are considered. Therefore, in an environment that is extremely loaded with fiber suspended matter and dust, the sealing action is impaired by the relatively large seal gap, and the rotation of the roller casing is somewhat hindered in the hollow chamber formed by the flange of the sleeve. Or it can sometimes happen that a lot of dirt that is unacceptably braked collects.

  German Offenlegungsschrift 15 10922, which forms the superordinate concept of the present invention, describes a seal with a sealing disk that is spring-elastically pressure-loaded in the axial direction, in which case the inner The centered support disk is followed by an outer centered seal disk with a large inner gap. The seal disk moving in the radial direction is fixed in position by the pressure applied in the axial direction. In this way, an extremely small seal gap is obtained between the seal disc and the roller casing.

  However, such a seal consists of a few components. In order to perform automatic assembly, a time-consuming embedded apparatus is required, and in this case, the defect of automatic integration is enhanced. This results in significantly higher costs than using the integral U-shaped sleeve described above. The seal disc is supported only in the axial direction by a small force of the clamping spring and may move slightly inward in the axial direction. This is accompanied by an unfavorable effect, especially when winding on the shaft occurs. In this case, the pressure due to the damped fibers may increase so that the sealing function of the sealing disk arranged against the ambient air towards the outside is continuously impaired. If the seal disk is pushed out from the centered position, the top roller may be braked by the inclination of the seal disk. There is also a risk that the function may be impaired by floating fibers gathered on the seal disk. The construction with these drawbacks of the seal shown in the above-mentioned German Offenlegungsschrift 15 10922 has not been achieved because it has proven to be advantageous in practice.

  The object of the present invention is to provide an improved double disc seal for the top roller.

  This problem is solved by an apparatus having the structure described in the characterizing portion of claim 1 based on the present invention.

  Advantageous configurations of this device are described in the dependent claims.

  In the double disc seal according to the present invention provided with another seal gap in front of the seal gap located on the outside, there is no functional hindrance due to the axial force acting on the seal disc from the outside during winding. Double disc seals are easily installed automatically. As a result, the manufacture and assembly of the double disc seal can be carried out at low cost. A defined orientation on the side of the double disc seal is not required for assembly. Double disc seals of the same configuration can be used at both ends of the shaft. Thus, the double disc seal according to the present invention does not require production and storage of different configurations.

  The support member according to claim 6 need only be manufactured in a single configuration. This reduces the number of various components required and to be produced for a double disc seal according to the present invention.

  First, as a group of components in which a double disc seal is incorporated in advance, the roller body provided on the shaft is fitted on the shaft to such an extent that the roller body can be tilted to fill the rolling member of the rolling bearing, and the configuration following the completion of the rolling bearing Incorporating the group back to the use position allows both the seal disc and the support member to form a narrow seal gap without problems during assembly. Since pre-integration to form a group of components and shaft integration can be automated, it can be implemented quickly and inexpensively.

  In the following, embodiments of the invention will be described in detail with reference to the drawings.

  The twin top roller 1 shown in FIG. 1 has two roller bodies 2 and 3, and these roller bodies 2 and 3 are supported by a common shaft 6 that is consistently extended by rolling bearings 4 and 5. Yes. A concave portion 8 is formed in the shaft 6, and the shaft 6 is held by a general-purpose holder in the concave portion 8. The inner chambers of the roller bodies 2 and 3 are respectively sealed against contamination by double disc seals 7 and 7A according to the present invention.

  In FIG. 2, a double disc seal 7 acting between the roller body 2 and the shaft 6 is shown enlarged. The support member for the sealing disk 9 is formed as an angle ring 10, in which case the disk-shaped part 11 serves as a stopper for the sealing disk 9. The sleeve-shaped portion 12 of the angle ring 10 has a stopper surface 13 along which a support member configured as a disk 14 is inserted and fixed in position by caulking. The disk 14 forms a stopper for the seal disk 15. The configurations of the seal disk 9 and the seal disk 15 are the same. These seal disks 9 and 15 are loaded in the axial direction with a pressing force by a coil spring 16. In this case, the seal disk 9 is pressed toward the disk-shaped portion 11 of the angle ring 10, and the seal disk 15 is pressed toward the disk 14. This spring force locks the seal discs 9 and 15 in the required centered use position, respectively, but new light centering is possible at any time. The coil spring 16 is made of a round wire. In this case, the wire diameter and the number of windings of the coil spring 16 are the distance between the seal disks 9 and 15 to which the length of the coil spring 16 is pressed. It is selected so that it can be preloaded to be slightly shorter. The inner diameter of the coil spring 16 is selected such that the coil spring 16 has little radial play with respect to the sleeve-like portion 12 of the angle ring 10. In this way, the spring winding forms a substantially gap-free surface, which facilitates assembly. The seal discs 9 and 15, together with the roller body 2, form very narrow seal gaps 17 and 18, respectively. The outer diameter of the disk 14 and the outer diameter of the disk-shaped portion 11 of the angle ring 10 are slightly smaller than the outer diameters of the seal disks 9 and 15. For example, the roller body 2 has an inner diameter of 16.18 mm, whereas the outer diameters of the seal disks 9 and 15 are 16.15 mm. The outer diameters of the disk 14 and the disk-shaped portion 11 are respectively 15.97 mm. As a result, the other seal gaps 19 and 20 between the disk 14 and the disk-shaped portion 11 are also narrow, and the sealing function of the double disk seal 7 is prevented from being continuously impaired when the shaft 6 is wound. To do. The angle ring 10 has chamfered portions 21 and 22 at each end of the inner diameter. The chamfered portion 22 is mainly formed when the disk 14 is caulked and fastened. The chamfered portions 21 and 22 facilitate centering when the double disc seal 7 is crimped to the shaft 6.

  In order to incorporate the double disc seal 7, the seal disc 9, the coil spring 16 and the seal disc 15 are sequentially fitted on the sleeve-like portion 12 of the angle ring 10, and then the disc 14 is joined to the stopper surface 13. The position is fixed by caulking. The component group thus obtained is pressed against the shaft 6 and pushed toward the recess 8 to such an extent that the roller body 2 can tilt to fill the ball of the rolling bearing 4 in the end region of the shaft 6. It is shifted.

  After the rolling bearing 4 is assembled, the double disc seal 7 formed as a constituent group reaches the use position in the direction of the end of the shaft 6 or the direction of the roller body 2 and can perform the sealing function. Pushed back. All integration steps can be performed with one automated integration procedure.

  The double disc seal 7 is configured so that the above-mentioned group of components can be incorporated without determining the orientation, that is, without specifying the orientation. The configurations of the double disc seal 7 and the double disc seal 7A are the same as shown in FIGS. In FIG. 1, the double disc seal 7 is incorporated into the left end portion of the shaft 6, whereas the double disc seal 7 </ b> A having the same configuration is incorporated into the roller body 3 at the right end portion of the shaft 6. . The sealing function and advantages of the same configuration according to the present invention are fully available at both positions.

  In FIG. 4 an alternative embodiment with a double disc seal 23 is shown. In order to form a pre-assembled group, a seal disk 25 is fitted over the sleeve-like portion of the angle ring 24. The two angle rings 24 mounted in this way are pressed into a coupling sleeve 26 made of elastic plastic in a mirror image manner, so that the sleeve-like portions of the angle ring 24 abut each other in the coupling sleeve 26. Retained. The coupling sleeve 26 has spring arms 27 at both ends. The coupling sleeve 26 can be integrally and inexpensively manufactured in an injection molding tool together with the spring arm 27, thereby reducing the number of individual parts required and the assembly effort. The double disc seal 23 incorporated in advance as a component group is formed symmetrically in the axial direction.

  Due to the spring force of the spring arm 27, the seal disc 25 is pressed in the axial direction toward the disc-shaped part of the angle ring 24 acting as a stopper, and is fixed in a shiftable position there. The double disc seal 23 incorporated as a component group may also be incorporated into the shaft 6 without determining its orientation, like the double disc seals 7 and 7A shown in FIGS. Both angle rings 24 are configured to cooperate with the roller bodies 2 and 3 to form separate narrow seal gaps 19 and 20.

  The double disc seal 23 and the rolling bearings 4 and 5 are assembled in the same manner as the double disc seals 7 and 7A. The angle ring 24 can be manufactured from a thin plate at a low cost without cutting. In order to incorporate the double disc seal 23, only the angle ring 24, the seal disc 25 and the coupling sleeve 26, i.e. three different members, have to be produced and stored. This results in significant cost savings.

  By forming the component group of the double disc seal 23 in a U-shape, this double disc seal 23 is made by the same built-in device as the integral U-shaped sleeve seal known from the aforementioned German Patent No. 19509055. Are automatically incorporated into the shaft 6.

  The invention is not limited to the embodiments described. In particular, regarding the configuration of the angle ring and the spring member, other configurations are possible within the framework of the present invention.

It is the figure which partially showed the twin top roller which has the double disc seal | sticker by this invention in a roller body, respectively, and was shown. It is an expanded sectional view of the part Y shown in FIG. It is an expanded sectional view of the part Z shown in FIG. It is an expanded sectional view of the structure of the double disc seal provided with two supporting members formed as an angle ring.

Claims (10)

A double disc seal for the top roller of the drafting device, each roller body being rotatably supported at the end of the shaft, and the seal disc roller with a narrow non-slip gap for sealing A support member configured as an angle ring is provided and formed with respect to the body and at least partially formed and arranged to be axially supported by a disc-shaped support member; In the type in which the sleeve-shaped part is fitted on the shaft and a spring member is provided to press both of the seal discs against the support member,
The support member (19, 20) is placed in front of the seal gap (17, 18) between the seal disc (9, 15, 25) and the roller body (2, 3). A double disc seal for the top roller of a drafting device, characterized in that 10, 14, 24) is constructed.   2. The double disc seal according to claim 1, wherein another seal gap (19, 20) is formed between the support member (10, 14, 24) and the roller body (2, 3).   The double disc seal according to claim 1 or 2, wherein the difference between the maximum diameter of the support member (10, 14, 24) and the maximum diameter of the seal disc (9, 15, 25) is less than 0.5 mm.   4. The double disc seal according to claim 3, wherein the difference between the maximum diameter of the support member and the maximum diameter of the seal disc (9, 15, 25) is less than 0.2 mm.   The double disc seal according to claim 1, wherein the spring member is a coil spring.   The double disc seal (23) has two support members, both of which are configured as angle rings (10), the sleeve-like portions of the angle rings being mirror-imaged relative to the shaft, respectively. 5. The device according to claim 1, wherein the disc-shaped portions of the angle ring are respectively located on the outside and the two sealing discs (25) are arranged between the disc-shaped portions. The double disc seal according to item 1.   The sleeve-like part of the support member forms a component that is press-fitted into the coupling sleeve (26) and is pre-assembled with both sealing discs (25) and at least one spring member. 6. The double disc seal according to 6.   8. The double disc seal according to claim 7, wherein the spring member is formed by a spring arm (27) of the coupling sleeve (26), the coupling sleeve (26) being made of elastic plastic.   The double disc seal according to claim 6 or 7, wherein the angle ring (24) is non-cut and formed from a thin plate.   First, the roller body (2, 3) provided on the shaft (6) is tilted to fill the rolling members of the rolling bearings (4, 5), with the double disc seal (7, 7A, 23) as a component group. The method of assembling a double disc seal according to claim 1, characterized in that it is fitted over the shaft to the extent that it can be done and then the component group is pushed back to the use position.

Images