JPS5984134A - Eccentricity compensating method in imbalance measurement - Google Patents

Abstract

PURPOSE:To perform accurate eccentricity compensation in an optional phase of a sleeve bearing by finding the compensation amount of eccentricity originating from a driven-side bearing from the phase difference between the driven-side and driving-side bearing parts, and compensating imbalance measured values in plural correction surfaces. CONSTITUTION:A reference signal generator 27 is connected to imbalance detecting circuits 29-31 to which pickups 11, 16, and 18 are connected and a phase difference detecting circuit 36. A subordinate reference signal generator 28 is connected to the circuit 36 to detect the phase difference between sleeve bearings 2 and 3. The amounts of imbalance detected by the circuits 29-31 are inputted to a correction surface separating and sensitivity circuit 32 and converted into the amounts of imbalance of respective correction surfaces, which are inputted to eccentricity compensating circuits 33-35. A compensation amount calculating circuit 37 receiving signals from a compensating value storage circuit 38 and the circuit 36 is connected to the circuits 33-35. The circuits 33-35 calculate the amounts of dynamic imbalance and the amount of imbalance due to eccentricity with regard to the respective correction surfaces to detect the final amounts of imbalance corresponding to the respective correction surfaces, and they are displayed on display meters 39-41 respectively.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an eccentricity compensation method in unbalance measurement, and particularly to a method of performing eccentricity compensation between a rotating shaft supported by a sleep bearing and an unbalance testing machine.

As shown in FIG. 1, a rotating shaft body, especially a rotating shaft body such as a propeller shaft, is composed of a rotating shaft body 1, a sleeve bearing 2,
There is an unbalance tester 6 equipped with 3, which is rotated to measure the unbalance, but when the unbalance of rotation II'ql + rest 1 is measured with the unbalance tester 6 using this method, it is found that the sleeve bearing If there is eccentricity between 2 and 3 and the rotating shaft body 1, there is a possibility that an unbalance due to the eccentricity will be detected. That is, for example, in the support part of the rotating shaft body 1 by the sleep bearing 2, the rotation center 11117 of the rotor 4 fitted in the bearing part and the rotation, i! i+l
There is an eccentricity a between the rotation center axis 8 of the I body 10, and an eccentricity a exists between the rotation center axis 9 of the rotor 5 fitted in the bearing part of the sleeve bearing 3 and the rotation center axis 8 of the rotation shaft body 1. If there exists an unbalance, an unbalance proportional to the eccentricities a and b will be detected even if the unbalance of the rotating shaft body 1 itself is zero. An example of an eccentricity compensation method for detecting and correcting the unbalance caused by such eccentricities a and b is an electrical eccentricity compensation method. There is something like the one shown in the figure.

This has bearing parts 12 and 13 at predetermined positions in the longitudinal direction.

Both ends of the rotating shaft body 10 having 142 are supported by sleeve bearings 2 and 3, and the bearing portion 1 of this rotating shaft body 1
32 supported by the elastic member 15 and supported by the elastic member 16
while supporting the sleeve bearing 2 by the elastic member 1o and connecting the pickup 11 to the sleeve bearing 2, further supporting the sleeve bearing 3 by the elastic member 17 and connecting the pickup 18 to the sleeve bearing 3, The pickups 11, 16, and 18 detect the vibrations of the respective parts and measure the unbalanced ft-. Rotor 5Ii of sleeve bearing 3,
Universal joint 19 having joint parts 20 and 21. ! :, a pulley 22 is connected to this universal joint 19, and a belt 23 is connected to this pulley 22.
The rotary shaft body 1 is operatively connected to the motor δ via a pulley 24 which is fixedly connected to the output shaft 26 of the motor δ, and receives the drive force of the motor b to rotate the rotary shaft body 1 at high speed. Further, a reference signal generator I is connected to the pickup 5 so as to be able to detect a phase change between the sleeve bearing 3 and the rotating shaft body 1, while each of the pickups 11, 16, 18 is electrically connected to a storage device not shown. After loading the rotating shaft body 1 into the unbalanced test @6, (A) first, the rotating shaft body 1 is rotated by the drive of the motor δ, and each pickup 11, 16 at that time is rotated.

Measured values on each bearing surface based on the detected values of 18 are stored in a storage circuit.

01 Next, one sleeve bearing (for example, sleeve bearing 3)
), leave the connection between the other sleeve bearing 2 and the rotary shaft body 1, reverse the connection by 180 degrees, and then rotate the rotary shaft body 1 and measure each bearing surface at that time. value and store it in the memory circuit.

(O Furthermore, leave the sleeve bearing 2 as it is, and connect the sleeve bearing 3 and the rotating shaft body 1 at the connection part 18
0 degree inversion and installation 7 (after that, the rotary shaft body 1 is rotated, and the measurements and values of each bearing surface at that time are stored in the memory circuit.

Each measured value obtained through the above three-step operation is input to a computing unit and computed, and eccentricity compensation operation is performed on each sleeve bearing based on the computed results. The same shape after this,
When measuring the unbalance of rotating shaft bodies of the same weight, this eccentricity compensation amount is memorized and by compensating with this value, (
4) The eccentricity compensation operations of (C) can be omitted.

However, in such an electrical eccentricity compensation method, in order for the compensation method to work, the phase relationship between the sleeve bearings 2 and 3 and the reference signal generator 2T must be in the state at the time of measurement and the state at the time of compensation. must be the same as However, the second
As is clear from the figure, in the conventional eccentricity compensation method described above,
Since the sleeve bearing 3 is mechanically directly connected to the reference signal generator 27, the phase relationship does not change, but the sleeve bearing 2 is connected to the other sleeve bearing 3 and the reference signal via the rotating shaft body 1. Since it is connected to the signal generator 27, once the rotating shaft body 1, which is the test object, is removed, the sleeve bearing 2 rotates freely, and the connection part of the sleeve bearing 2 is used to connect subsequent rotating shaft bodies of the same shape. If the rotating shaft body was reattached for one minute during unbalance measurement in step 1, there was a risk that eccentricity compensation could not be performed accurately due to a phase shift between the sleeve bearing 2 and the reference signal generator H. For this reason, when installing the rotary shaft body 1, it was necessary to connect the two bearings so that the phase angles of both bearings were matched.

The present invention has been made by focusing on such conventional considerations, and its purpose is to ensure that the sleep bearing supporting the test specimen is in any phase when performing eccentricity compensation using an unbalance tester. Is there an eccentricity compensation method that always allows accurate eccentricity compensation? The purpose is to provide and solve the above conventional problems.

In the eccentricity compensation method for unbalance measurement, the present invention provides a rotating shaft to be tested that can be supported and rotated by attaching both ends to sleep bearings or the like of a testing machine, making it possible to measure unbalance. This is a balance testing machine for the purpose of testing, and has a sleep bearing, etc. on the driven side that is not mechanically connected except through the rotating shaft under test. Regarding the device that electrically compensates for unbalance caused by the eccentricity of the mounting part between the bearing and the bearing itself, the phase of the sleeve bearing on the driven side is driven by the attachment and detachment of the rotating shaft under test to the testing machine. In order to operate the eccentricity compensation operation normally even if the side bearing is connected with a change in connection, a sub-phase reference signal generator is connected to the driven side bearing to detect the phase, and a sub-phase reference signal generator is installed on the drive side. Detect the phase difference between the driven fill 1iLI1 + receiver and the main phase reference signal generator 11-)
A compensation calculation circuit is provided that uses this phase difference to phase-rotate the stored value of the eccentricity compensation amount caused by the driven side bearing and converts it into the current compensation amount. The gist is that the compensation amount is subtracted from the measured value.

EMBODIMENT OF THE INVENTION Hereinafter, the present invention will be described in detail based on embodiments shown in the accompanying drawings.

FIGS. 3 and 4 are diagrams showing an embodiment of the present invention.

Of these, FIG. 3 shows a measuring mechanism in an unbalance testing machine that employs the electrical eccentricity compensation method according to the present invention. Here, reference numerals 1 to 27 ll1JZ indicate the same parts as those of the conventional unbalance testing machine. III. Also in this embodiment, both Q of the rotating shaft body 1
::5 parts are supported by the sleeve 1llr bearings 2 and 3, and the 1i+It bearing part 13 of the rotating shaft body 1 is supported by the connecting part 15 to connect the old pickup 16, while each of the sleep bearings 2.3 is elastically It is supported by members 10 and 17, and a pickup 11 is mounted on these sleeve bearings 2 and 3.
゜18 are connected, and each pickup 11, 16, 18
The sleep bearing 3 is designed to detect the vibration of each part and measure the discrepancy.
The rotating shaft body 1 is rotated by driving the connected motor b.
Rotate at high speed. In the present invention, the sleep bearing 2 is connected to the reference signal generator I connected to the sleeve bearing 3 and the auxiliary reference signal generator 28. is electrically connected to the reference signal generator 77. When the rotating shaft body 1 is removed from the unbalance tester 6, even if the sleep bearing 2 rotates freely, this rotation is detected by the sub-reference signal generator 28, and a signal from the sub-reference signal generator 28 is detected. The reference signal generator 27 is based on the free rotation source in the sleep bearing 2? The phase difference between the sleeve bearing 27 and the reference signal generator 27 is eliminated.

FIG. 4 shows a measuring circuit for implementing the eccentricity compensation method of the invention. The pickups 11, 16, 18 are connected to unbalance detection circuits 29, 30, 31, respectively, and these unbalance detection circuits 29, 30, 3
1, the output signal from which is modified plane separation and sensitivity circuit 3
It is connected to 2 so that it can be operated manually.

On the other hand, the reference signal generator 27
6, 18 are connected to the unbalance detection circuit 29, 3
0.

31 and is also connected to a phase difference detection circuit 36. This phase difference detection circuit 36 is further connected to a sub-reference signal generator 28, which detects the phase difference between the sleep bearings 2 and 3 when the rotating shaft body 1 is replaced. Each pickup 1 detected by the unbalance detection circuits 29, 30, 31
The unbalanced urine in the 1, 1 (i, 18 portions) is input to the correction surface separation and sensitivity circuit 32, and is converted into an unbalanced portion in each correction surface on which unbalance correction is to be performed.Furthermore, this correction surface An unbalance signal corresponding to each correction m1 is output from the separation and sensitivity DJl path 32, and an eccentricity compensation circuit 33 is also provided corresponding to each correction surface.
, 34 and 35.

On the other hand, regarding the signals from the reference signal generator I and the sub-reference signal generator 28, the phase difference signal is output from the phase difference detection circuit 36 and is input to the compensation amount calculation circuit 37.

In this compensation amount calculation circuit 3T, an eccentricity compensation value corresponding to the phase difference between both sleeve bearings 2 and 3 is pasted in a compensation value storage circuit 38 which is stored in advance. The amount of unbalance compensation due to eccentricity is calculated by receiving the signal from the phase difference detection circuit 36.
This compensation calculation circuit 37 includes eccentricity compensation circuits 33 and 34.
, 35, and the output signal from the compensation ffi calculation [i'ji path 37 is inputted thereto. As a result, the eccentricity compensation circuits 33 , 34 , 35 receive the signal from the correction surface separation and sensitivity circuit 32 and the compensation amount calculation circuit 3 .
The signal from 7 is input, and the dynamic balance amount on each correction surface and the amount of unbalance due to eccentricity of the sleeve bearing 2.3 and the rotating shaft body 1 [C1] are calculated.
The final mismatch corresponding to each correction surface is detected, taking into account the amount of mismatch between both sides, and each display meter 39
, 40 and 41. The dynamic balance σ1'l of the rotating shaft body can be adjusted by correcting the unbalance on each correction surface according to the indications on the display meters 39, 40, 41.

In the unbalance tester having such a configuration, the unbalance of the rotating shaft body 1 is measured using the steps (3) to (00) described above.In this measurement operation, from the change in the measured value in the A term and the measured value in the B term , (1) Influence value on the first correction surface when the sleep bearing 2 is reversed Ell (2) Influence value on the second correction surface when the sleeve bearing 22 is reversed B1□ (3) When the sleep bearing 2 is reversed The influence value , ElB on the third correction plane when reversed is obtained. Also, from the change in the measured value in the B term and the measured value in the 0 term, (4) the influence value when the sleep bearing 3 is reversed 10 Influence value on the correction surface P21 (5) Influence value on the second correction surface when the sleep bearing 3 is reversed E22 (6) Influence value on the third correction surface when the sleep bearing 3 is reversed 123 When moving from the measurement and determination operations in item B above to the measurement operations in item 0, even if the sleep bearing 2 rotates freely due to the removal of the rotating shaft 1, the phase shift caused by this free rotation is calculated. is the sub reference signal generator 2
8 to the phase difference detection circuit 36.
The correlation never shifts.

Therefore, accurate values can be obtained as influence values for each of the above correction planes. Therefore, the eccentricity compensation amount for each correction surface is determined by: No + E21 for the first correction surface, ``u-+E2'' for the second correction surface, and E+s+E2 for the third correction surface.

Note that the eccentricity compensation amount in the above equation is obtained as a vector amount. Then, each vector reference signal generator 28 and the sub-reference signal generator 27 when performing eccentricity compensation operation,
The phase difference between 28 and 28 is significant.

After the eccentricity compensation amount is determined as described above, in the next measurement, unless the phase of the sleeve bearing 20 changes, compensation will be performed in the same manner as in the previous measurement step. When the phase of the sleeve iii+It receiver 2 changes, the effect of eccentricity of the sleeve bearing 2 also rotates by the amount that the phase changes, so the phase difference between the reference signal generator 27 and the sub reference signal generator 28 can be detect,
The above (1
) , (2) , (In 31: The shadow value Ell l E+21 island on each correction plane in 31 is rotated in phase, and then E, , +E2. IE+2+ E22 + , Fi+
s+ B2s ft n out S tL u Yo I, n.

As described above, the eccentricity compensation method in the unbalance test according to the present invention has the advantage that it can be used in any state for the sleep bearing supported at both ends of the rotating shaft, and it can also be used in any state to remove residual debris present in the sleeve bearing. It can be compensated at the same time.

Therefore, for example, when measuring unbalance of a rotating shaft body such as an automobile propeller shaft, there is no need to remove the rotating shaft body or connect the sleeve shafts while aligning the angles of both sleeve shafts, which simplifies the work procedure. This has the effect of improving measurement accuracy at the same time.

[Brief explanation of drawings]

Is the rotating shaft in Figure 1? Fig. 2 is a schematic diagram showing a general configuration for measuring unbalance supported by a sleeve bearing, and shows a conventional example of a method for compensating eccentricity of a sleeve bearing in measuring unbalance of a rotating shaft body. It is an explanatory diagram. FIG. 3 shows a sleeve bearing eccentricity compensation method according to an embodiment of the present invention. It is a schematic explanatory diagram of the states shown. FIG. 4 is a block diagram showing the unbalance detection procedure in the unbalance measurement method of the present invention. 1... Rotating shaft body 2, 3... Sleeve bearing 6
...Unbalance test TA 7, 8, 9...Rotation + 4'V + 已 and 11 other patent applicants Akashi Seisakusho Co., Ltd.

Claims (1)

[Claims] The driving side bearing connected to the main phase reference generator and the driven side bearing? By attaching both ends of the rotating shaft to be tested to both of the bearings, it is supported and rotated, and both bearings are mechanically connected via this rotating shaft.
In the method of electrically compensating for unbalance caused by the eccentricity of the mounting part between both bearings and the rotating shaft body, the residual unbalance of the bearing itself is detected by a tester on the driven side bearing as the phase of the bearing in question. A sub-phase reference signal generator is connected, and the phase difference between this sub-phase reference signal generator and the above-mentioned main phase reference signal generator is detected, and based on this phase difference, the drive side bearing rotates freely. Phase-rotating the stored value of the eccentricity compensation amount and calculating the compensation amount after the free rotation,
By subtracting the above compensation amount from the unbalance measurement values on multiple correction planes, even if the phase of the driven side bearing is displaced with respect to the driving side bearing due to the attachment and detachment of the rotating shaft body to the balance tester, the eccentricity compensation described above is achieved. An eccentricity compensation method in unbalance measurement characterized by ensuring normal operation.