JP2007247087A - Roller device and assembling method thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a roller changing method causing no troubles such as seizure even if anyone changes a roller shell in a godet roller used in a production system for directly spinning and drawing synthetic fiber. <P>SOLUTION: A roller device rotating at a high rotation speed and used for picking up and drawing a thread of a synthetic fiber such as polyester, polyolefin, polyamide has a hole diameter of fitting hole 1c having a straight shape and bored in a boss 1a of a roller, smaller than the shaft diameter of a spindle shaft 3 fitted to the fitting hole 1c, and the fitting hole 1c and the fitting shaft 3a are fixedly "tight fit". <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a roller device used for drawing and drawing to produce a synthetic fiber and a method for assembling the roller device, and more particularly to a roller device suitable for a high-speed rotation of 3000 m / min or more and a method for assembling the roller device.

  Roller devices that take up or stretch synthetic fibers such as polyester, polyolefin, and polyamide are increasing in yarn production speed year by year in order to improve production efficiency. For example, at present, the roller is frequently operated at a high speed exceeding 5000 m / min.

  However, when the rotational speed of the roller is increased to 3000 m / min or more, particularly exceeding 5000 m / min, the weight of the roller itself is, for example, 15 to 30 kg. Also, the length of the roller inevitably tends to be long because it is necessary to process the multi-threads on the roller, or it is necessary to increase the contact time between the yarn and the roller in heat treatment or the like. In addition, such a roller adopts a cantilever support structure in order to improve workability such as threading on the roller.

  For the reasons described above, the roller device that rotates at high speed inevitably generates vibrations, although there are differences in the amplitude and vibration frequency of the generated vibrations. As long as the vibration generated at this time is within a range that does not affect the yarn production, there is no significant influence, but the generated vibration reaches a level that affects the yarn production due to the various factors described above. If such vibration is generated, it propagates throughout the roller device and causes resonance that causes operational trouble.

  Therefore, it is necessary to suppress the vibration generated in the roller device. As a technique for suppressing the vibration of the roller device used for such yarn making, for example, in Patent Document 1 (Japanese Patent Laid-Open No. 8-285010). It has been proposed to attach a vibration damping device to the roller device.

  The technique proposed in Patent Document 1 is a shaft bearing portion for transmitting a rotational driving force from a driving device (motor) to a roller (referred to as “Galet” in Patent Document 1) and its support. A vibration damping device (for example, a rubber O-ring) is attached between the two parts to dampen vibration. However, this conventional technique is intended to attenuate the generated vibration on the premise of generation of vibration, but is not a technique for removing the cause of the generation of vibration.

  In general, a roller device that pulls or stretches synthetic fibers such as polyester, polyolefin, polyamide, and the like is described in, for example, the above-mentioned Patent Document 1 (FIGS. The tip of the spindle shaft connected to the motor) has a tapered taper shape, and a tapered fitting hole that fits and fits the tapered taper portion of the spindle shaft is provided. After being combined, it has a structure in which it is connected by a connecting member such as a bolt.

  However, in such a structure, unless the tapered portions formed in the shaft portion and the hole portion to be fitted to each other are precisely processed so as to be accurately fitted to each other, the spindle shaft and the roller after the fitting are not processed. It is necessary that the bolt mounting holes that firmly connect the two are not eccentric, and that the load balance is not deviated. For this reason, it is indispensable to process with high accuracy, which causes an increase in processing cost.

In addition, the conventional roller device inevitably generates vibrations, and it is inevitable to adjust the dynamic balance of the rotating body in the assembled state after assembling the parts constituting the roller device. However, this process is a complicated and time-consuming process, and it is desired to simplify this process as much as possible.
JP-A-8-285010 (full text)

  In view of the problems of the prior art described above, the problem (objective) to be solved by the present invention is to suppress vibration itself generated in a yarn-making roller device that rotates at a high speed of 3000 m / min or more, particularly 5000 m / min or more. Another object of the present invention is to provide a roller device that can easily adjust the dynamic balance after assembling the roller device, and an assembly method that can assemble the roller device easily and reliably.

In order to solve the problems described above, the inventions described in the following (1) to (5) are provided.
(1) A fitting hole having a straight shape formed in a boss portion of a roller in a high-speed rotating roller device used for taking up and stretching a yarn made of a synthetic fiber such as polyester, polyolefin, or polyamide. A roller device in which the hole diameter is smaller than the shaft diameter of the spindle shaft that fits into the fitting hole, and the fitting hole and the fitting shaft are fixed by “fitting fit”.
(2) The roller device according to (1), wherein the roller and the spindle shaft are coupled to each other only by fixing with a “clearance fit”.
(3) The roller device according to (1) or (2), wherein the rotation speed of the roller is 5000 m / min.
(4) The diameter of the fitting hole having a straight shape formed in the boss portion of a high-speed rotating roller used for taking up and stretching a yarn made of synthetic fiber such as polyester, polyolefin, polyamide, etc. The shaft diameter is smaller than the shaft diameter of the spindle shaft that fits into the fitting hole, and the fitting hole and the fitting shaft are “fitted” by matching the roller and the spindle shaft. Assembly method of a roller device press-fitted into
(5) The method for assembling the roller device according to (4), wherein the press-fitting direction between the fitting hole and the fitting shaft is a vertical direction in the press-fitting between the roller and the spindle shaft.

  In the roller device according to the present invention, since the fitting hole and the fitting shaft having a straight shape are fitted and fixed by “fitting”, the fitting hole and the fitting shaft can be processed easily and accurately. Therefore, if the roller (fitting hole side) and the spindle shaft (fitting shaft side) are assembled while maintaining the same axis so that there is no axial misalignment, essentially no eccentricity or eccentric load occurs. The number of roller devices can be reduced.

  Then, the dynamic balance adjustment performed after assembling the roller device becomes extremely easy, and it is not necessary to provide a vibration damping device that presupposes the generation of vibration as in the prior art. In addition, since the roller and the spindle shaft are fixed in a state where the strength and rigidity are increased by “fitting”, the natural frequency increases, and a roller device that can withstand higher speed rotation can be obtained.

Hereinafter, the present invention will be described with reference to the drawings.
FIG. 1 is a front cross-sectional view schematically illustrating an embodiment of a roller device for pulling or stretching synthetic fibers such as polyester, polyolefin, and polyamide. In FIG. 1, reference numeral 1 denotes a roller, reference numeral 2 denotes a driving device (hereinafter referred to as a motor unit), reference numeral 3 denotes a spindle shaft of the motor unit 2, reference numeral 4 denotes an assembly base, and reference numeral C denotes an axis (in the figure). (Shown by alternate long and short dashed lines). The motor unit 2 used in the roller device of the present invention is not particularly limited as long as the gist of the present invention is satisfied. For example, a synchronous motor that can easily and accurately control the rotation speed by inverter control is used. It is preferable.

  Here, a straight through hole 1c which is not tapered as in the conventional roller device is formed in the boss portion 1a of the roller 1. Further, the fitting portion 3a of the spindle shaft 3 that fits into the through hole 1c is also finished in a straight shape instead of the conventional tapered shape. Further, the shaft diameter of the fitting portion 3a of the spindle shaft 3 is slightly larger than the hole diameter of the fitting hole 1c, and is fitted to each other by “fitting fit”.

  As a specific example, for example, the spindle shaft 3 is made of chrome molybdenum steel with hard chrome plating, the shaft diameter of the fitting portion is φ55.010 mm, and the length of the fitting portion is 200 mm. And The material of the roller 1 fitted to the spindle shaft 3 is chrome molybdenum steel, the diameter of the yarn contact portion 1b is φ250 mm, and the yarn contact length is 500 mm. The diameter of the fitting hole 1d is φ55.000 mm and the fitting length is 200 mm.

  At that time, it is preferable to heat the roller 1 to thermally expand the fitting hole 1c during press-fitting, and press-fit the spindle shaft 3 into the fitting hole 1c after heating or during heating. This is because the pressure input can be further reduced in this way, whereby it is possible to prevent a large distortion from occurring in one or both of the roller 1 and the spindle shaft 3 during the press-fitting. This is because vibration caused by distortion can be prevented during operation.

  As described above, in the roller device according to the present invention, after fitting the fitting hole and the fitting shaft, which are processed into a conventional tapered shape, to each other, it is not necessary to fix them with a bolt or the like, The roller 1 and the spindle shaft 3 are press-fitted and fixed by “fitting”. Moreover, a connecting member such as a bolt for connecting the roller 1 and the spindle shaft 2 is not essential as in the conventional apparatus.

  As described above, in the roller device according to the present invention, unlike the conventional device, it is not necessary to accurately process the fitting hole portion and the fitting shaft portion into a tapered shape, and a straight cylindrical straight hole is not required. Alternatively, the shaft may be processed. For this reason, special processing such as taper processing is not required, and processing itself is simple and easy. In addition, the processing accuracy of the hole diameter and shaft diameter and the surface finishing accuracy of the fitting surface can be significantly improved.

  In addition, there is no need to prevent the rotation of the roller 1 fitted to the spindle shaft 3 that transmits the rotational force from the motor unit 2 with a bolt or the like so as not to idle. Therefore, dynamic balance adjustment is extremely easy. Further, the roller 1 and the spindle shaft 3 are firmly coupled by “tight fit”. As a result, the fixing strength and rigidity are increased, and the natural frequency of the entire roller device is also increased. Therefore, a roller device capable of rotating at a higher speed can be obtained.

  As described above, the roller device according to the present invention is characterized by adopting the fitting method by “fitting fit”. For this reason, when the roller device is assembled, if the shaft center between the roller 1 and the spindle shaft 3 is deviated during assembly of the roller device, there is a risk of deeply scratching the fitting surface.

  However, this problem is merely a problem of center alignment during assembly. Therefore, a jig for aligning the axis between the roller 1 and the spindle shaft 3 may be manufactured in advance. Thus, if a jig which is a commonly used method is used, the problem caused by the misalignment can be easily solved.

  On the contrary, if the roller device is assembled so that the shaft center between the roller 1 and the spindle shaft 3 is aligned with a jig so that the shaft center does not go wrong, no matter who performs the assembly work, the fitting surface is deeply damaged. The roller device can be automatically assembled well without any trouble. Hereinafter, this assembly method will be described with reference to FIG.

  To assemble the roller device according to the present invention, first, the motor unit 2 is fixed on the assembly frame 4. The motor unit 2 may be fixed to the assembly base 4 in the same manner as when the motor unit 2 is attached to a take-up device or a stretching device when used in the yarn making process. In addition, if it demonstrates taking the case where a hydraulic press apparatus (not shown) is used as a press-fitting means as an example, one side (lower surface plate) of two surface plates formed above and below this hydraulic press device The vertical axis is accurately adjusted and attached so that the axial center direction of the spindle shaft 3 is vertical with respect to the horizontal plane formed by.

  After fixing the motor unit 2 to the assembly base 4 in this way, a roller (not shown) is placed on the same axis C so that the axis center of the spindle shaft 3 and the axis center of the roller 1 coincide with each other. Positioning and adjustment is performed so that the axis of 1 comes. At this time, the jig is mounted on the other surface plate (upper surface plate) of the hydraulic press device, and the center line of the roller 1 is illustrated along the axis line indicated by the one-dot chain line in FIG. It plays the role of adjusting to be on the center axis C.

  Here, as the jig used in the present invention, the axis of the roller 1 and the spindle shaft 3 can be accurately aligned with the axis C indicated by the one-dot chain line, and contribute to the assembly of the roller device. If so, there is no need to particularly limit the shape and structure. In addition, since the jig | tool (or center alignment tool) conventionally used for such an axial center alignment is a thing which can be designed easily by those skilled in the art, the description is abbreviate | omitted here.

  As described above, the axial centers of the roller 1 and the spindle shaft 3 are accurately positioned, installed between the two surface plates of the hydraulic press device, and the hydraulic press device is operated, for example, as shown in FIG. Move to the position where the upper surface plate is press-fitted in the direction of the white arrow. By doing so, anyone can press-fit the roller 1 into the spindle shaft 3 in a “tight fit” state, and the roller device can be easily assembled. In this way, the fitting hole and the fitting shaft are accurately positioned so that the shaft centers of the fitting hole and the fitting shaft overlap at the time of the press fitting.

It is front sectional drawing which illustrated typically one Embodiment of the roller apparatus which concerns on this invention, and its assembly method.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1: Roller 1a: Boss part 1b: Yarn contact part 1c: Fitting hole 1d: Fitting part on the hole side 2: Motor unit 3: Spindle shaft 3a: Fitting part on the shaft side C: Shaft center (dashed line)

Claims (5)

  Hole diameter of a fitting hole having a straight shape formed in a boss portion of a roller in a high-speed rotating roller device used for taking up and stretching a yarn made of synthetic fiber such as polyester, polyolefin, polyamide, etc. Is smaller than the diameter of the spindle shaft that fits into the fitting hole, and the fitting hole and the fitting shaft are fixed by “fitting fit”.   The roller device according to claim 1, wherein the roller and the spindle shaft are coupled to each other only by fixing by a “clearance fit”.   The roller device according to claim 1, wherein a rotation speed of the roller is 5000 m / min.   The hole diameter of the fitting hole with a straight shape drilled in the boss part of a high-speed rotating roller used for taking up and stretching yarns made of synthetic fibers such as polyester, polyolefin, polyamide, etc. The shaft diameter is smaller than the shaft diameter of the spindle shaft that fits into the hole, and the roller and the shaft axis of the spindle shaft are matched to press fit the fitting hole and the fitting shaft so as to have a “fitting fit”. Assembling method of the roller device.   The roller device assembling method according to claim 4, wherein in the press-fitting between the roller and the spindle shaft, a press-fitting direction of the fitting hole and the fitting shaft is a vertical direction.

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