JP4444759B2 - Bearing abnormality detection device - Google Patents

Description

  The present invention relates to a bearing abnormality detection device that detects abnormality of a bearing that rotatably supports various rotating bodies.

For example, a bearing that supports a cylinder in a printing machine is an important element in determining printing quality, and quality control is strictly performed. Nevertheless, defective bearings may be mixed in, damage to the bearings during assembly, poor adjustment, deterioration due to long-term use, and the like, which may reduce print quality. In order to solve this problem, there has been a demand for an abnormality detecting device for detecting an abnormality of a bearing to predict or diagnose the damage of the bearing. Conventional bearing anomaly detection devices use a strain gauge attached to a frame in the vicinity of a bearing that supports the end shaft of an intaglio cylinder in an intaglio printing press. Is detected by a strain gauge (for example, see Patent Document 1). In addition, the applicant could not find any prior art documents closely related to the present invention by the time of filing other than the prior art documents specified by the prior art document information described in the present specification. .
No. 6-5167 (page 2, right column, lines 5 to 10, line 1)

In the conventional bearing abnormality detection device described above, since the strain gauge is directly attached to the frame, the mechanical force due to vibration generated when the notches of the intaglio cylinder and the impression cylinder face each other. Noise and electrical noise generated from the drive system may be directly detected by the strain gauge. For this reason, there is a problem that the required distortion is not easily detected with high accuracy due to the influence of noise . Also, since strain gauges are attached structure directly to the frame, it is necessary to remove the strain gauges at the time of maintenance and the like, there is a fear that defeat the detection portion of the strain gauges when removing and damaging It was necessary to prepare and attach a new strain gauge, which led to an increase in cost. Further, since the strain gauge is directly attached to the frame without interposing a member that amplifies the distortion of the bearing, there is a problem that the detection sensitivity is poor. In addition, since the strain gauge is attached in a state exposed to the atmosphere, the adhesion of oil or the like to the strain gauge not only reduces the durability but also makes it uneconomical.

  The present invention has been made in view of the above-described conventional problems. The object of the present invention is to accurately detect necessary distortions, improve detection sensitivity, and improve durability and reuse. It is to improve economy by making it possible.

In order to achieve this object, the invention according to claim 1 includes a rotating body rotatably supported on a frame via a bearing, and a strain gauge attached to the bearing and detecting an abnormality of the bearing. attaching a detecting portion of the strain gauge on a pedestal made of low conductivity material to the material of the bearing is the strain gauge through the pedestal formed by attaching the bearing.

  The invention according to claim 2 is the invention according to claim 1, wherein a pair of the strain gauges are provided, and the strain gauges are attached to the pedestal so that an angle formed between the extending directions of the respective strain gauges is substantially a right angle. .

The invention according to claim 3 is the invention according to claim 1, wherein the strain gauge is adhered to the pedestal .

  The invention according to claim 4 is the invention according to claim 1, wherein the pedestal is made of aluminum.

  The invention according to claim 5 is the invention according to claim 1, wherein the pedestal is formed of a material having a low Young's modulus relative to the material of the bearing.

According to the first aspect of the present invention, since the strain gauge detection unit is attached to the bearing via a pedestal formed of a material having a lower conductivity than iron, electrical noise in the strain gauge detection unit is obtained. Therefore, the required distortion can be detected with high accuracy.

  According to the invention which concerns on Claim 2, the influence of the thermal expansion by a temperature change can be excluded.

  According to the invention which concerns on Claim 4, the sensitivity of the detection part of a strain gauge becomes favorable by making the base into aluminum with a low Young's modulus.

  According to the fifth aspect of the present invention, since the pedestal is formed of a material having a low Young's modulus with respect to the material of the bearing, the pedestal can be transmitted to the detection part of the strain gauge without suppressing the distortion of the detected part. For this reason, the sensitivity of the strain gauge detector is improved.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a side view of a printing unit of an offset rotary printing press equipped with a bearing abnormality detection device according to the present invention, FIG. 2 shows an eccentric bearing that also supports a rubber cylinder, and FIG. FIG. 3B is a side sectional view, FIG. 3 is an enlarged perspective view of the bearing abnormality detecting device, and FIG. 4A shows the result detected by the bearing abnormality detecting device according to the present invention. FIG. 4B shows the result detected by the conventional detection method.

  A printing unit of an offset rotary printing press generally indicated by reference numeral 1 in FIG. 1 includes a plate cylinder 2 on which a printing plate is mounted, and a rotating body on which a blanket that is in contact with the plate cylinder 2 is mounted on a peripheral surface. A rubber cylinder 3 and an impression cylinder 4 that contacts the rubber cylinder 3 are provided. Of these cylinders 2, 3, and 4, both end shafts of the plate cylinder 2 and the impression cylinder 4 are rotatably supported by left and right frames 5 of the printing unit 1 via bearings (not shown). Further, both end shafts 3a of the rubber cylinder 3 are rotatably supported by eccentric bearings 6 (described later) fitted to the left and right frames 5.

  A bracket 8 is supported on a stud 7 projecting outward from the frame 6 on one side close to the end shaft of the impression cylinder 4, and a stepping motor 9 as a driving device is driven on the bracket 8. The rod 10 is fixed in an upright state. By driving the stepping motor 9 to rotate the nut 9a, the drive rod 10 screwed with the nut 9a is configured to move up and down. A connecting lever 12 formed in an L shape in a front view is pivotally attached to the protruding portion of the lever shaft 11 positioned above the drive rod 10 and supported at both ends by the left and right frames 5.

  As shown in FIG. 2, the eccentric bearing 6 includes an outer ring 16 fitted into the housing 14 via needle rollers 15 in a housing 14 fitted in the bearing hole of the frame 5 and bolted thereto, and the outer ring 16 It is formed with an inner ring 18 that is rotatably fitted via a tapered roller 17. The bearing lever 20 fixed to the outer ring 16 of the eccentric bearing 6 and the connecting lever 12 are connected by a rod 21, and the driving rod 10 is advanced and retracted by the driving of the stepping motor 9. The eccentric bearing 6 is configured to rotate while rolling the needle roller 15 through the bearing 21 and the bearing lever 20.

  The shaft core on the inner peripheral surface of the inner ring 18 constituting the eccentric bearing 6 and the shaft core on the outer peripheral surface of the outer ring 16 of the eccentric bearing 6 are eccentric from each other by a predetermined dimension. In such a configuration, by moving the rod 10 of the stepping motor 9 forward and backward, the cylinder is inserted so that an appropriate printing pressure is applied, and the cylinder is separated so that the cylinders are separated from each other.

  The bearing abnormality detection device according to the present invention generally indicated by reference numeral 25 in FIG. 3 includes a pedestal 26 made of aluminum which is a flat, rectangular parallelepiped and non-ferrous metal, and a pair of strain gauges 27, 28 is attached. These strain gauges 27 and 28 are arranged such that the detection portions 27a and 28a are arranged so that the angle formed by the extending direction L1 of the detecting portion 27a and the extending direction L2 of the detecting portion 28a is substantially perpendicular. The entire parts 27a and 28a are covered with the epoxy adhesive 29 and coated on the base 26. As shown in FIG. 2A, the bearing abnormality detection device 25 configured as described above has the lower surface of the base 26 attached to the end surface of the housing 14 of the eccentric bearing 6 with a phenol-based adhesive.

  In this state, the printing press is operated and the cylinders 2, 3, and 4 are rotated. At this time, if any abnormality occurs in the eccentric bearing 6, vibration is generated between the end shaft 3 a of the rubber cylinder 3 and the inner ring 18. This vibration is transmitted to the housing 14 at a constant cycle, and the housing 14 periodically slightly deforms due to this vibration. This deformation is detected as strain by the strain gauges 27 and 28 of the bearing abnormality detection device 25 attached to the housing 14.

  At this time, since the strain gauges 27 and 28 are attached to the housing 14 via a pedestal 26 formed of aluminum having a relatively low Young's modulus with respect to the material of the eccentric bearing 6, slight deformation of the housing 14 is caused by the pedestal. Therefore, the detection sensitivity of the strain gauges 27 and 28 can be improved. In addition, since aluminum has a lower electrical conductivity than iron, the influence of electrical noise on the detectors 27a and 28a of the strain gauges 27 and 28 can be reduced, so that the required strain can be detected accurately. can do.

  Further, the detection units 27a and 28a of the strain gauges 27 and 28 are arranged so that the angle formed by the extending direction L1 of the detecting unit 27a and the extending direction L2 of the detecting unit 28a is substantially perpendicular. Thus, even if the housing 14 is expanded due to heat, the difference between the detection values detected by the detection unit 27a and the detection unit 28a is obtained, and this difference can be used to reduce the expansion of the housing 14 due to heat. Since the detected value of the true distortion that has been removed can be obtained, the detection accuracy can be improved. Further, since the entire detection portions 27a and 28a of the strain gauges 27 and 28 are covered with the epoxy adhesive 29, oil or the like does not directly adhere to the detection portions 27a and 28a. In addition, it is reusable and economical. Further, since the pedestal 26 is attached to the housing 14 with an adhesive, the adhesive functions as a cushioning material between the pedestal 26 and the housing 14. For this reason, since the impact caused by the notches of the cylinders 2, 3, and 4 facing each other is alleviated by this adhesive, it is not affected by mechanical noise in the detection units 27a and 28a. Necessary distortion can be accurately detected. Further, since the detecting portions 27a and 28a of the strain gauges 27 and 28 are not directly attached to the eccentric bearing 6, but are attached via the aluminum pedestal 26, when the strain gauges 27 and 28 are removed during maintenance or the like. Further, it is only necessary to remove the base 26 to which the strain gauges 27 and 28 are attached from the eccentric bearing 6, and there is no possibility of damaging the strain gauges 27 and 28. In addition, the strain gauge can be easily detected by simply attaching the pedestal 26 again at the end of the maintenance.

As shown in FIG. 4 (A), the vibration waveform detected by the bearing abnormality detection device 25 according to the present invention is compared to the conventional detection device shown in FIG. Since the influence of electrical noise is eliminated, the waveform is less disturbed. Further, the reason why the peak value of the waveform is larger than that of the conventional case is that it is attached to the housing 14 via a pedestal 26 formed of aluminum having a relatively low Young's modulus. This is thought to be due to the improvement. In particular, among the first to third row vibrations 30A to 30C, which are fine vibration groups caused by fluctuations in the eccentric bearing 6 of the printing press, low frequency fine vibration groups that have been difficult to detect in the past. It can be seen that the first row vibration 30A is significantly detected as compared with the conventional case. In the figure, the vertical axis represents the amount of distortion, and the curve of each graph represents every 2000 rph from the bottom of the rubber cylinder 3 to 6000,8000... 18000 rph. The horizontal axis indicates the frequency.

  In the present embodiment, the pedestal 26 is made of aluminum. However, it may be made of a metal other than aluminum as long as it is a non-ferrous metal, or made of a resin having a lower conductivity than iron. May be. Further, although an example of a bearing that supports a cylinder having a constant angular velocity has been described, the present invention can also be applied to detect an abnormality in a bearing that supports a swing shaft of a swing device in which the angular velocity changes. Moreover, although the example used for the rubber | gum cylinder 3 as a rotary body was demonstrated, you may use for rollers, such as a plate cylinder, an impression cylinder, a transfer cylinder, an ink apparatus, and a water supply apparatus. Further, the lower surface of the pedestal 26 is bonded to the end surface of the housing 14 of the eccentric bearing 6 with a phenol-based adhesive, but the pedestal 26 may be fixed to the housing 14 with bolts.

1 is a side view of a printing unit of an offset rotary printing press equipped with a bearing abnormality detection device according to the present invention. The eccentric bearing which pivotally supports the rubber | gum cylinder in the printing unit of the offset rotary printing press equipped with the abnormality detection apparatus of the bearing which concerns on this invention is shown, The figure (A) is a front view, The figure (B) is side sectional drawing. It is. It is a perspective view which expands and shows the abnormality detection apparatus of the bearing which concerns on this invention. FIG. 4A shows the result detected by the bearing abnormality detection device according to the present invention, and FIG. 4B shows the result detected by the conventional detection method.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Printing unit, 2 ... Plate cylinder, 3 ... Rubber cylinder, 4 ... Impression cylinder, 6 ... Eccentric bearing, 14 ... Housing, 16 ... Outer ring, 18 ... Inner ring, 25 ... Bearing abnormality detection apparatus, 26 ... Base, 27 , 28 ... Strain gauge, 27a, 28a ... Detection part, 29 ... Epoxy adhesive, 30A thru 30C ... Row vibration.

Claims (5)

A rotating body rotatably supported by a frame via a bearing;
A strain gauge attached to the bearing and detecting an abnormality of the bearing;
An abnormality detection apparatus for a bearing, wherein the strain gauge detection unit is attached to a pedestal made of a material having low conductivity relative to the material of the bearing, and the strain gauge is attached to the bearing through the pedestal. In the bearing abnormality detection device according to claim 1,
A bearing abnormality detecting device, wherein a pair of the strain gauges are provided, and the strain gauges are attached to the pedestal so that an angle formed between the extension gauges is approximately a right angle. In the bearing abnormality detection device according to claim 1,
  An apparatus for detecting an abnormality of a bearing, wherein the strain gauge is attached to the pedestal. In the bearing abnormality detection device according to claim 1,
An apparatus for detecting an abnormality of a bearing, wherein the pedestal is made of aluminum. In the bearing abnormality detection device according to claim 1,
An apparatus for detecting an abnormality of a bearing, wherein the pedestal is formed of a material having a low Young's modulus relative to a material of the bearing.

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