JPWO2011058740A1 - Method and device for detecting rotational resistance of bearing - Google Patents

Abstract

An object of the present invention is to detect a rotational resistance force of a bearing of the rotating body without providing a torque meter or a load cell on the rotating body such as a roller and a pulley. In the belt conveyor, with the roller 23A supported by a fixed shaft via a bearing, the roller 23A is rotated at the installation site without removing the roller 23A, and the rotation is performed using the non-contact type tachometer 25. Then, the time change of the rotational speed decrease is measured for the roller 23A. Then, the rotational resistance force of the bearing of the roller 23A is calculated using the temporal change of the rotational speed reduction.

Description

The present invention relates to the rotation of a bearing capable of detecting the rotational resistance force of a bearing in a rotating body such as a roller and a pulley used in the installation site of a belt conveyor or the like without removing the rotating body from the equipment. The present invention relates to a resistance detection method and a detection apparatus.
Background art

  Conventionally, when checking the degree of energy saving on a belt conveyor with high energy saving effect, power consumption (power value: kW) is measured as an index, but this power consumption measurement result and simulation result (calculation result) ) May be large. This is considered to be mainly due to the influence of the rollers supporting the conveyor belt (deterioration, change in grease viscosity, biting of foreign matter, etc.).

  Therefore, when such defects occur, the rotational resistance of the roller bearing, which is considered to be the main cause of this defect, is detected and compared with the initial rotational resistance of the bearing. It is considered to be evaluated. However, since the belt conveyor is a large facility that is immovably installed at a specific location, it is possible to easily detect the rotational resistance force of the roller bearing for the evaluation without removing the roller at the installation site. desired.

  Conventionally, when evaluating the quality of a bearing of a rotating body such as a roller, it is common to measure the friction coefficient of the bearing using a torque meter or a load cell. In such a method, it is necessary to provide a tool for installing a torque meter and a load cell on the roller for measurement. In some cases, it is necessary to remodel the equipment itself, and the work space may be restricted, so improvement is desired.

  By the way, as a method of measuring the coefficient of friction, in a hard disk driver in a device such as a computer or a Japanese word processor, the disk is rotated at a predetermined speed without causing friction between the head or the head holder and then rotated. When the disk is rotated freely, the rate of change of the rotational angular speed of the disk when the disk is freely rotated, and when the disk is rotated to the predetermined speed with friction generated between the head and the head holder and then rotated freely. There is known a method for calculating a friction coefficient based on the change rate of the rotational angular velocity of the disc and the moment of inertia of the disc rotating portion (see, for example, Patent Document 1).

Japanese Patent Publication No. 7-77014

The technique described in Patent Document 1 described above is the rotational angular velocity of the disk when the disk is rotated at a predetermined speed without causing friction between the head or the head holder and then the rotation is freely rotated. Not only the rate of change, but also the rate of change in the rotational angular velocity of the disc when the disc is rotated to the specified speed with friction generated between the head and the head holder and then the disc is rotated freely. The rate of change in the rotational angular velocity of the disk when it is rotated is calculated, but large equipment such as belt conveyors that are different from devices such as computers and Japanese word processors do not have such a head or head holder. So it cannot be applied as it is.

  In particular, in a large facility such as a belt conveyor, it is required to evaluate the rotational resistance of the rotating body without removing the rotating body from the facility at an actual installation site. Since the installation site is often a place that is subject to significant restrictions on the work space, such as in a tunnel, it is necessary that the operation for detecting the rotational resistance force be as simple as possible. In addition, not only large equipment but also equipment in which it is difficult to remove the rotating body, even in the case of such equipment, the rotating body can be rotated without removing the rotating body from the equipment at the actual installation site. It is required that the resistance force can be detected. Furthermore, even in a facility where the rotating body can be removed, it may be necessary to detect the rotational resistance of the rotating body without removing the rotating body from the facility.

  The present invention easily detects the rotational resistance force of the rotating body in an installation site (especially a large facility) having a rotating body such as a roller and a pulley without removing the rotating body from the equipment at the installation site of the equipment. An object of the present invention is to provide a method and apparatus for detecting the rotational resistance force of a bearing.

  According to the first aspect of the present invention, in a facility in which a rotating body is installed at a fixed position and is rotatably mounted via a bearing, the rotational resistance force of the bearing of the rotating body can be obtained without removing the rotating body from the facility. A method for detecting a rotational resistance force of a bearing to be detected, wherein the rotating body is in a freely rotatable state via the bearing, the rotating body is freely rotated in this state, and the rotating body is rotated. It is characterized in that the temporal change of the number reduction is measured, and then the rotational resistance force of the bearing of the rotating body is calculated using the time change of the rotational speed reduction. Here, the “facility” includes various facilities such as a large facility such as a belt conveyor and a facility installed at a fixed position so as not to move. Moreover, the state which can be rotated freely means the state which can be rotated without contacting other members (except for what is required for the measurement of rotation speed, such as a contact-type tachometer).

  In this way, without removing the rotating body from the equipment at the installation site of the equipment, the rotating body remains in a state of being rotatably supported by the equipment via a bearing. The rotational resistance force of the bearing of the rotating body can be easily determined by allowing the rotating body to freely rotate through the bearing, rotating the rotating body free in that state, and measuring the temporal change in the rotational speed of the rotating body. Can be calculated. Therefore, the quality of the target bearing can be evaluated by comparing the detected rotational resistance force with the initial rotational resistance force.

  In particular, as the work at the installation site, the rotating body is supported only by a support shaft (fixed shaft) via a bearing, and the rotating body is freely rotated in this state, and the rotated rotating body is rotated. It is easy to work because it only measures the time change of the number drop, and even if it is installed immovably in a place where there is not enough space, it does not place much burden on the operator, The rotational resistance force of the bearing of the rotating body can be calculated.

  According to a second aspect of the present invention, the rotating body is rotatably supported by a fixed shaft via the bearing, and the rotating body rotates with respect to the fixed shaft. By measuring the rotational speed of the rotating body, the temporal change of the rotational speed reduction can be obtained.

  In this way, at the installation site of the equipment, without providing a torque meter or a load cell in contact with the rotary body, and without removing the rotary body from the equipment, the rotary body is connected to the equipment via a bearing. The rotational resistance force of the bearing of the rotating body can be easily calculated while being supported rotatably on the fixed shaft.

  As described in claim 3, the measurement using the non-contact type tachometer is performed by detecting the movement of the reflective seal attached to the rotating body to detect temporal changes in the rotational speed of the rotating body. Should be requested. That is, by detecting the movement of the reflective seal affixed to the rotating body, it can be seen that the rotating body has made one rotation, and this is used to detect a change in the rotational speed.

  In this way, the rotational speed necessary for calculating the rotational resistance force of the bearing of the rotary body using a non-contact type tachometer is only required by attaching a reflective seal to the rotary body whose rotational speed is to be detected. The time course of the decline can be measured. Therefore, the work burden on the operator at the installation site is reduced. In particular, since only the reflective seal is pasted on the necessary portion of the rotating body, it is only necessary to remove the dirt on the pasting portion when pasting the reflective seal, which is advantageous in reducing the work burden.

  According to a fourth aspect of the present invention, the rotating body has a rotating shaft, the rotating shaft is rotatably supported via the bearing, and the rotating body and the rotating shaft rotate integrally. The time-dependent change in the rotation speed is obtained by contacting the rotating body or the rotating shaft with a detection unit of a contact-type tachometer and measuring the rotation speed of the rotating body with the contact-type tachometer. It is also possible. In this case, it is necessary to clean the part which contacts the detection part of a contact-type tachometer.

  According to this configuration, when the rotating body and the rotating shaft rotate integrally, the rotating unit or the rotating shaft is brought into contact with a detection unit of a contact-type tachometer, and the rotation is performed by the contact-type tachometer. The rotational speed of the bearing of the rotating body can be easily calculated by measuring the rotational speed of the body to determine the temporal change of the rotational speed reduction.

  According to a fifth aspect of the present invention, the facility includes a conveyor belt that is rotationally driven, a plurality of rollers that contact the inner peripheral surface of the conveyor belt to support the conveyor belt, and a frame that supports the roller. The rotary body can be the roller.

  This makes it easy to calculate the rotational resistance of the roller bearings without removing the rollers (for example, carrier rollers, return rollers, etc.) from the belt conveyor at the installation site of the belt conveyor. can do. In particular, the belt conveyor is often installed in a place such as a tunnel where there is not enough space, but is particularly effective because the work in such a place is simplified.

  In this case, as described in claim 6, the roller that is the rotating body is set in a freely rotatable state using a lifting tool that lifts the conveyor belt from the roller, and the roller, the conveyor belt, It is also possible to form a gap between them.

  In this way, the burden on the operator for making the roller, which is the rotating body, free to rotate is reduced.

  According to a seventh aspect of the present invention, in a facility in which a rotating body is installed at a fixed position and is rotatably attached to a fixed shaft via a bearing, the rotation of the bearing of the rotating body can be performed without removing the rotating body from the facility. A rotational resistance detection device for a bearing that detects a resistance force, comprising: a reflective seal affixed to the rotating body; and a non-contact type tachometer that detects the rotational speed of the rotating body using the reflective seal And a rotational resistance force calculating means for receiving a signal from the tachometer and calculating a rotational resistance force of the bearing of the rotating body by using a temporal change of the rotational speed decrease in the free rotating state of the rotating body. It is characterized by providing.

  If it does in this way, the rotational resistance force of the bearing of the said rotary body can be easily calculated in the state where the rotary body was supported by the fixed shaft via the bearing at the installation site.

  Further, the invention of claim 8 is a facility in which a rotating shaft of a rotating body is rotatably attached via a bearing at a fixed position, and the rotation of the bearing of the rotating body can be performed without removing the rotating body from the facility. A rotational resistance force detection device for a bearing for detecting a resistance force, comprising: a contact-type tachometer that detects a rotational speed of the rotating body by contacting a detecting unit with the rotating body or the rotating shaft; A rotation resistance force calculating means for receiving a signal and calculating a rotation resistance force of a bearing of the rotating body using a temporal change of a decrease in the number of rotations of the rotating body in a free rotation state; .

  In this way, the rotational resistance force of the bearing of the rotating body can be easily calculated while the rotating shaft of the rotating body is rotatably supported by the equipment via the bearing at the installation site.

  In this case, as described in claim 9, the facility includes a conveyor belt that is rotationally driven, a plurality of rollers that contact the inner peripheral surface of the conveyor belt to support the conveyor belt, and the rollers that support the roller. A belt conveyor having a frame to be rotated, and the rotating body may be the roller.

  In this way, at the installation site of the belt conveyor, the rotational resistance force of the roller bearings can be increased while the rollers (for example, carrier rollers, return rollers, etc.) are rotatably mounted without being removed from the belt conveyor. It can be calculated easily.

  The lifting tool may be further disposed between the frame and the conveyor belt, and the lifting tool may include a base portion that is placed on the frame, and the conveyor belt. It is desirable to have a contact portion that comes into contact with the inner peripheral surface, and a lever member that is rotatably provided on the base portion and displaces the contact portion in a direction away from the conveyor belt.

In this way, the burden on the operator for making the roller, which is the rotating body, free to rotate is reduced.
Effect of the invention

  Since the present invention is configured as described above, it is possible to easily detect the rotational resistance of the bearing of the rotating body while the rotating body is rotatably supported at the installation site of the facility.

It is explanatory drawing of the rotational resistance detection apparatus of the bearing of the rotary body (roller) which concerns on this invention. It is explanatory drawing of a detection procedure. (A)-(c) is the longitudinal cross-sectional view, principal part enlarged view, and side view of a roller, respectively. It is a figure which shows the measurement condition in the installation field. It is explanatory drawing of the method of rotating a roller freely using a rotary tool. It is a figure which shows an example of the state of the rotation speed fall. The usage method of a lifting tool is shown, (a) is explanatory drawing of the installation position of a lifting tool, (b) is sectional drawing in the AA of FIG. 7 (a). It is explanatory drawing of the roller which is a rotary body with which the rotating shaft was integrated. It is explanatory drawing of the pipe belt conveyor for dust generating materials.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  As shown in FIG. 1, the rotational resistance detection device for a bearing is a non-contact type that measures the number of revolutions (rpm) of the reflective seal 12 affixed to the surface of a cylindrical roller 11 that is a rotating body and the roller 11. Type tachometer 13 (for example, HT-5500 manufactured by Ono Sokki Co., Ltd., a digital handy tachometer). The roller 11 is actually detected in a state where the roller 11 is rotatably supported by a fixed shaft 16 fixed to the frame of the equipment via bearings 17A and 17B (see FIG. 3A). For convenience of explanation, only the roller 11 and the fixed shaft 16 are shown in FIG.

  This tachometer 13 is connected to a personal computer 15 via an amplifier 14. As a result, the signal from the tachometer 13 is converted into a voltage and taken into the personal computer 15 as the rotation speed information. This personal computer 15 functions as a rotational resistance force calculating means for calculating the rotational resistance force μP of the bearing 17A (or 17B) of the roller 11 by utilizing the temporal change of the rotational speed decrease of the roller 11 in the free rotation state. It will be. This personal computer 15 is small (portable) and can be taken to the installation site. Therefore, by inputting necessary information and rotational speed information from the tachometer 13, the rotational resistance force μP ( If necessary, the friction coefficient f) can also be calculated at the installation site.

  Next, a method for calculating the rotational resistance of the roller bearing will be described with reference to FIG.

First, specifications (such as moment of inertia I, mass W, outer diameter d ₆ of the rotating body, diameter d ₁ of the friction generating portion of the bearing) of the roller 11 to be detected are input to the personal computer 15 (S1).

  Then, the roller 11 to be detected is manually rotated by the operator (S2), and the rotational speed of the roller 11 becomes a value sufficiently larger than the target value (the rotational speed actually used) to be detected. Is confirmed by the output of the tachometer 17, the hand is released, and free rotation is performed (S3). Here, free rotation means a state in which an extra resistance other than the rotation resistance of the bearing is not acting.

In this free rotation state, the signal from the tachometer 17 is taken into the personal computer 15 as rotation speed information, and the temporal change (rotation speed change) of the rotation speed decrease is measured (S4). That is, the relationship between time and the number of revolutions, which is a change in the number of revolutions with time, is measured. The measurement is performed continuously including the range of the actual number of rotations, and a graph is created. From the graph, a certain time T is left in the range of the actual number of rotations used. The two rotation speeds R ₀ and R ₁ may be selected, or the two rotation speeds R ₀ and R ₁ may be directly selected with a fixed time T within the range of the rotation speeds actually used. You may make it measure. In any case, it suffices if the two rotation speeds R ₀ and R ₁ and the time interval T at which they are measured can be measured within the range of the rotation speed actually used.

The rotation resistance force μP of the bearing is calculated based on the calculation formula by the rotation resistance calculation means (personal computer 15) using the fixed time T and the two rotation speeds R ₀ and R ₁ (S5).

  Here, the calculation formula for calculating the rotational resistance force μP of the bearing is as follows (see FIGS. 3A to 3C).

ここで、ｒ₀ ：制動前（回転数低下前）の角速度(rad/s)
Ｒ₀ ：制動前（回転数低下後）の回転数(rpm)

Where r ₀ : angular velocity before braking (before speed reduction) (rad / s)
R ₀ : Number of revolutions (rpm) before braking (after lowering the number of revolutions)

ここで、ｒ₁ ：回転数低下に要した時間Ｔ経過後の角速度(rad/s)
Ｒ₀ ：回転数低下に要した時間Ｔ経過後の回転数(rpm)

Here, r ₁ : Angular velocity (rad / s) after time T required for rotation speed reduction
R ₀ : Number of revolutions (rpm) after the time T required for the number of revolutions to decrease

ここで、μＰ ：軸受の回転抵抗力(N)
Ｉ ：慣性モーメント(kg・ｍ²)
ｒ₀：制動前の角速度(rad/s)
ｒ₁：制動後の角速度(rad/s)
Ｔ ：回転数低下に要した時間(sec)
ｒ ：抵抗が生じている部分の半径(m)
また、この回転抵抗力μＰを利用すれば、次の式により前記軸受の摩擦係数ｆを計算することも可能である。

Where μP: bearing rotational resistance (N)
I: Moment of inertia (kg · m ² )
r ₀ : Angular velocity before braking (rad / s)
r ₁ : Angular velocity after braking (rad / s)
T: Time required for rotation speed reduction (sec)
r: radius (m) of the portion where the resistance is generated
If this rotational resistance force μP is used, the friction coefficient f of the bearing can be calculated by the following equation.

ここで、ｆ：軸受の摩擦係数
ｄ₆：回転体の直径（外径）(m)
ｄ₁：抵抗が生じている部分の直径(m)
Ｗ：運動部分の質量(kg)
ｇ：重力加速度(m/sec²)

Where f: friction coefficient of the bearing
d ₆ : Rotating body diameter (outer diameter) (m)
d ₁ : Diameter (m) of the portion where the resistance is generated
W: Mass of moving part (kg)
g: Gravity acceleration (m / sec ² )

  Next, the procedure for actually detecting the rotational resistance μP and the friction coefficient f of the bearing at the installation site will be described with reference to FIG. In this embodiment, the target equipment is a belt conveyor 21 (large equipment) that supports a conveyor belt 22 that is rotationally driven by carrier rollers 23A, 23B, and 23B arranged in a trough shape. Then, it is possible to detect the rotational resistance force (also the friction coefficient if necessary) of the bearings of the carrier rollers 23A, 23B, and 23B and the return roller bearing (not shown). As an example, the rotation of the bearing of the carrier roller 23A is detected. A case where the resistance force is detected will be described. That is, a belt having a carrier roller 23A located in the center and having a horizontal fixed shaft (not shown) and left and right carrier rollers 23B and 23B having inclined fixed shafts disposed on both sides of the center carrier roller 23A. Of the carrier rollers 23A, 23B, and 23B of the conveyor 23A, the rotational resistance force of the bearing of the carrier roller 23A disposed at the center is detected.

(Prerequisite)
At the installation site of the belt conveyor 21 as a large facility, an operator lifts the conveyor belt 22 by hand, and lifts the conveyor belt 22 above the surface of the carrier roller 23A, thereby forming a gap therebetween. The carrier roller 23A is not in contact with the conveyor belt 22, and is in a state where it can be freely rotated.

  Then, if necessary, the roller surface is cleaned, a reflective seal 24 is affixed to the roller surface, and a non-contact tachometer 25 (for example, digital) is made to correspond to the path through which the reflective seal 24 passes by the rotation of the carrier roller 23A. Handy Tachometer Co., Ltd. Ono Sokki HT-5500) is installed. The tachometer 25 is supported by a stand (not shown), and is fixed to an appropriate portion of the conveyor frame 26 by a magnet provided on the stand.

Prior to the actual measurement of the rotational speed, first, the inertial force I, mass W, outer diameter d ₆ , friction generating portion of the roller to be measured for measuring the rotational resistance force μP of the bearing and the friction coefficient f are measured on the personal computer 15. The roller specifications such as the diameter d _{1 of the above} are input. This is because these values are necessary when calculating the rotational resistance force μP and the friction coefficient f of the bearing by the above-described calculation formula. It should be noted that it is also possible to previously input the roller specifications of a plurality of types of rollers into the personal computer 15 and select the roller specifications of the roller to be measured at the installation site.

(First stage)
With the conveyor belt 22 floating, the carrier roller 23A is manually rotated by the operator in a state where the carrier roller 23A can be freely rotated. By this free rotation, it is confirmed that the carrier roller 23A has a sufficiently higher rotation speed than the rotation speed to be measured (the rotation speed actually used).
Although rotation by the operator's hand varies among individuals, the rotation resistance force and friction coefficient of the bearing are calculated based on a decrease (change) in the number of rotations. The maximum speed is about 620 rpm. When the roller diameter is 114.9 mm, the belt speed is 224 m / min.

(Second stage)
After confirming that the carrier roller 23A has a rotational speed sufficiently higher than the rotational speed to be measured, the operator's hand is separated from the carrier roller 23A to stop applying the rotational force, and the carrier roller 23A Rotate freely.
Further, as shown in FIG. 5, a friction wheel 32 is attached to a shaft portion 31 a of a rotary tool 31 such as an electric drill, the friction wheel 32 is brought into contact with the carrier roller 23 </ b> A, and the friction wheel 32 is rotationally driven by the rotary tool 31. By doing so, it is possible to reduce the burden on the operator by rotating the carrier roller 23A freely.

(3rd stage)
From the measurement result of the rotation speed (rotation speed) by the tachometer 25 with the passage of time, the temporal change (relationship between time and rotation speed) of the rotation speed of the carrier roller 23A is stored in the personal computer 15. In this case, as described above, a graph is created by continuous measurement, and a fixed time T and two rotation speeds R ₀ and R ₁ are obtained from the actual rotation speed range based on the graph. Alternatively, the two rotational speeds R ₀ and R ₁ may be directly measured with a certain time T in the range of the rotational speed actually used.
An example of the measurement result is shown in FIG. 6, for example, as shown in FIG. 6, after the operator's hand is separated from the carrier roller 23A, the rotational speed (rotation) of the carrier roller 23A is caused by the rotational resistance of the bearing of the carrier roller 23A. Speed) tends to decrease gradually.

(Fourth stage)
From the relationship between the rotational speed of the carrier roller 23A measured in the third stage and the time, the two rotational speeds R ₀ and R ₁ and the time interval T at which they are measured are read in the range of the actual rotational speed of the roller. Using these, the rotational resistance force μP and the friction coefficient f of the bearing of the carrier roller 23A are calculated by the above-described calculation formula.

  In this way, even among the carrier rollers 23A, 23B, and 23B of the belt conveyor 23A, even if the carrier roller 23A is disposed in the center where measurement is difficult due to the relationship with the conveyor belt 22, it can be removed without removing it. The rotational resistance force μP and the friction coefficient f of the bearing can be easily detected. By comparing the detected rotational resistance force μP and the friction coefficient f with the initial rotational resistance force and the friction coefficient, it is possible to easily evaluate the quality of the bearing.

In addition, if the rotational resistance force μP and the friction coefficient f of the roller bearing can be detected in this way, the degree of deterioration of the bearing performance can be easily quantified and used for maintenance to maintain the performance of the bearing itself. can do.
In addition to the embodiment described above, the present invention can be implemented with the following modifications.

(i) In the above embodiment, the operator lifts the conveyor belt by hand so that the roller 23A can freely rotate. However, a method other than lifting by hand, for example, a rod, the conveyor belt and the roller The roller can be rotated freely by being inserted between the two or by lifting the conveyor belt with a lifting tool. If the belt conveyor is a large facility and the conveyor belt is large, it is difficult for the operator to lift it by hand (hands get tired), so it is not possible to lift the conveyor belt by inserting a rod or using a lifting tool. It is particularly effective.
For example, using a lifting tool, the conveyor belt can be lifted as shown in FIGS. The lifting tool 45 includes a base portion 45A placed on the frame 42, a contact portion 45B (horizontal portion 45Ba, inclined portion 45Bb) that contacts a part of the inner peripheral surface of the conveyor belt 43, and a base portion. 45A has a lever member 45C that is rotatably supported on one side in the frame width direction and can displace the contact portion 45B in a direction in which the conveyor belt 43 is separated from the rollers 23A, 23B, and 23B (see FIG. 4). A rotating shaft 45Ca of the lever member 45C is rotatably supported by the support portion 45Aa on the base portion 45A, and is connected to the horizontal portion 45Ba of the contact portion 45B at the distal end portion of the lever member 45C. The inclined portion 45Bb of the contact portion 45B has a shape corresponding to the conveyor belt 43 in the normal state, and is located on the side where the support portion 45Aa is provided.

  Then, in the vicinity of the rollers 23A and 23B to be measured, a lifting tool 45 is inserted from one side in the frame width direction between the frame 42 of the belt conveyor 41 and the conveyor belt 43 (FIG. 7B). ), The lever member 45C is pushed down to lift the conveyor belt 43 together with the contact portion 45B, and a gap is formed between the roller 44 and the conveyor belt 43 (see the chain line in FIG. 7 (b)). The roller 44, which is a body, can be in a freely rotatable state. A roller 46 supports the conveyor belt 43 from the lower side on the return side, and is rotatably supported by a support bracket 47 attached to the frame 42 so as to protrude downward. Although not specifically shown, it is also possible to provide a locking means for locking the lever member 45C so that the state can be maintained in a state where the gap is formed.

  (ii) In the above embodiment, the rotating body is applied to a cylindrical rotating body such as a carrier roller of a belt conveyor. However, the present invention is not limited to this, such as a sirocco fan of a blower. The present invention can also be applied to a cylindrical rotating body. In addition, disk-like rotating bodies such as pulleys also measure the number of rotations by detecting the rotational resistance force and friction coefficient of the bearing by cutting off the relationship with the transmission belt and the motor and setting it to the free rotation state. be able to.

(iii) In the embodiment, the rotating body is rotatably supported by a fixed shaft via a bearing, and the rotating body rotates with respect to the fixed shaft. For example, as shown in FIG. When the roller 51 as a rotating body has a rotating shaft 51a, the rotating shaft 51a is rotatably supported by a support member 52 via a bearing 53, and the roller 51 and the rotating shaft 51a rotate integrally. This can also be applied in the same manner by attaching a reflective seal to the roller 51 or the rotating shaft 51a. In this case, not only cleaning the outer peripheral surface of the roller 51 and the rotating shaft 51a and attaching a reflective seal, but also removing the dust mixing prevention cover 54 of the support member 52 and filling the inside with grease or the like. In some cases, it may be removed, cleaned, and a reflective seal is affixed to the rotating shaft 51a for measurement.
(iv) In the above embodiment, a non-contact type tachometer is used, but a contact type tachometer can also be used. In this case, if necessary, after cleaning the contact part of the rotating body or rotating shaft, contact type tachometer (for example, contact type digital handy tachometer HT-3200, manufactured by Ono Sokki Co., Ltd.) The temporal change of the decrease in the rotational speed can be calculated by bringing the detector into contact and measuring the rotational speed of the roller 51, which is the rotating body, with the contact-type tachometer.

  (v) In the above embodiment, the three carrier rollers 23A, 23B, and 23B are applied to the roller bearings of the belt conveyor arranged in the trough type. However, the invention is not limited to the case where the carrier rollers are arranged in the trough type. A roller conveyor of a belt conveyor whose roller axis is supported only by a horizontally extending roller, or a pipe conveyor in which rollers 61 are arranged on the circumference and the conveyor belt 62 is used as a cylinder as shown in FIG. The present invention can also be applied to 63 roller bearings.

11 Roller 12 Reflective seal 13 Non-contact tachometer 15 Personal computer (rotation resistance calculation means)
16 Fixed shaft 21 Belt conveyor 22 Conveyor belt 23 Roller 24 Reflective seal 25 Non-contact type tachometer 42 Frame 43 Conveyor belt 44 Roller 45 Lifting tool 45A Base part 45B Contact part 45C Lever member

Claims (10)

Rotation resistance force of a bearing that detects the rotation resistance force of the bearing of the rotating body without detaching the rotating body from the equipment in an installation that is installed at a fixed position and is rotatably attached via a bearing A detection method,
The rotating body is in a freely rotatable state via the bearing, and the rotating body is freely rotated in this state,
Measure the time change of the rotational speed reduction for the rotated rotating body,
Then, the rotational resistance force of the bearing of the rotating body is calculated using the temporal change of the rotational speed reduction.
The rotating body is rotatably supported on a fixed shaft via the bearing, and the rotating body rotates with respect to the fixed shaft,
The method of detecting a rotational resistance force of a bearing according to claim 1, wherein a temporal change of the rotational speed decrease is obtained by measuring the rotational speed of the rotating body using a non-contact type tachometer.
3. The measurement using the non-contact type tachometer is for obtaining a temporal change in the rotational speed reduction of the rotating body by detecting the movement of a reflective seal attached to the rotating body. For detecting the rotational resistance of bearings.
The rotating body has a rotating shaft, the rotating shaft is rotatably supported via the bearing, and the rotating body and the rotating shaft rotate integrally.
The time change of the said rotation speed fall is calculated | required by making the detection part of a contact-type tachometer contact the said rotary body or the said rotating shaft, and measuring the rotation speed of the said rotary body with the said contact-type tachometer. A method for detecting a rotational resistance force of the bearing.
The facility is a belt conveyor having a conveyor belt that is rotationally driven, a plurality of rollers that contact the inner peripheral surface of the conveyor belt to support the conveyor belt, and a frame that supports the roller.
The method for detecting a rotational resistance of a bearing according to claim 1, wherein the rotating body is the roller.
The roller which is the rotating body is in a state where it can be freely rotated by forming a gap between the roller and the conveyor belt using a lifting tool for lifting the conveyor belt from the roller. 5. A method for detecting a rotational resistance force of a bearing according to 5.
In a facility that is installed at a fixed position and is rotatably attached to a fixed shaft via a bearing, a bearing that detects a rotational resistance force of the bearing of the rotor without removing the rotor from the facility. A rotational resistance detection device,
A reflective seal affixed to the rotating body;
A non-contact tachometer that detects the number of rotations of the rotating body using the reflective seal;
Rotational resistance force calculating means for receiving a signal from the tachometer and calculating a rotational resistance force of a bearing of the rotator using a temporal change of a decrease in the number of rotations in the free rotation state of the rotator. A rotation resistance detecting device for a bearing characterized by that. Rotation resistance of a bearing that detects the rotational resistance force of the bearing of the rotating body without removing the rotating body from the equipment in an installation in which the rotating shaft of the rotating body is rotatably attached via a bearing at a fixed position A force detection device,
A contact-type tachometer that contacts a detector with the rotating body or the rotating shaft and detects the number of rotations of the rotating body;
Rotational resistance force calculating means for receiving a signal from the tachometer and calculating a rotational resistance force of a bearing of the rotator using a temporal change of a decrease in the number of rotations in the free rotation state of the rotator. A rotation resistance detecting device for a bearing characterized by that. The facility is a belt conveyor having a conveyor belt that is rotationally driven, a plurality of rollers that contact the inner peripheral surface of the conveyor belt to support the conveyor belt, and a frame that supports the roller.
9. The bearing rotation resistance detecting device according to claim 7, wherein the rotating body is the roller. And a lifting tool disposed between the frame and the conveyor belt,
The lifting tool includes a base portion placed on the frame, a contact portion that contacts an inner peripheral surface of the conveyor belt, and a rotation portion that is rotatably provided on the base portion. The bearing rotational resistance detecting device according to claim 9, further comprising a lever member that displaces the roller in a direction away from the roller.

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