JPS61192924A - Automatic regulation device for bearing alignment - Google Patents

Abstract

PURPOSE:To adjust the position of a bearing accurately when the bearing is shifted in its position, by holding the bearing through actuators and controlling each actuator by oscillation of the shaft part. CONSTITUTION:A position control unit 23 receives a position signal, and outputs control signals b1-b4 to each of servo valves of actuators 16A-16D. Displacement signals c1-c4 output from each of displacement meters 20A-20D are fed back to the position control unit 23. Moreover, an oil pressure source 24 feeds high pressure oil to each of the actuators 16A-16D, and is controlled by the position control unit 23. Consequently, the position of the bearing 11 can be adjusted accurately, if the bearing 11 is shifted in its position when the turbine is driven.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an automatic alignment adjustment device for a bearing that supports a rotor of a rotating machine such as a turbine.

BACKGROUND ART As shown in FIG.
)-In a 〇-ta system consisting of a generator (3), the shafts 5 (4) of each 〇-ta are supported via bearings (5) and connected via elastic joints (6). There are many.

Eliminate elastic joints to make it more compact,
As shown in Figure 2, a method of connecting using rigid joints (1) (rigid couple printers) (7) is used, which also reduces the number of bearings (5), making the device more compact and lower in cost. It is being However, in the case of such a multi-bearing shaft system (one rotor is supported by eight or more bearings), the position of the bearings, that is, the alignment, determines the accuracy of the shaft system. & Front characteristics are affected, and there is a desirable alignment for vibration reduction. Therefore, machines are sometimes installed so that the desired alignment is achieved under sudden operating conditions. Although it is not always a sudden problem, vibration problems are often caused by poor alignment. In such cases, measures are taken to measure the alignment on-site and adjust the bearing position using shims, etc., but this is extremely time-consuming and complicated! There is a bearing alignment device disclosed in Japanese Patent No. 55-47014. This device uses an eccentric link, and its adjustment range is uniquely determined by the amount of eccentricity of the eccentric link, and there is a problem in that it can only adjust positions on a circular locus whose radius is the amount of eccentricity.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide an automatic bearing alignment adjustment device that can adjust the bearing to an arbitrary position.

Means for Solving the Problem In order to solve the above problem, the bearing alignment self-help adjustment device of the present invention supports the four outer peripheral surfaces of the bearing that supports the shaft of the rotor through actuators, and and a displacement meter for detecting the relative displacement between the outer peripheral surface of the corresponding bearing and a control device for controlling the operation of each of the actuators. a vibration calculation unit that calculates the positional deviation of the bearing based on the vibration signal from the detector; and a vibration calculation unit that calculates the positional deviation of the bearing based on the vibration signal from the vibration calculation unit;
The position control section outputs an actuator operation signal to the actuator drive section, and the displacement signal from the displacement meter is fed back to the position a1 section during control.

If the bearing supporting the shaft of the working rotor is misaligned, abnormal vibrations will occur in the shaft. This abnormal vibration signal is input to the vibration calculation section via the vibration detector, and the direction in which the vibration is shifted is calculated. This calculated value is then input as a position signal to the position control section, and a control signal corresponding to this position signal is output to each actuator to move the bearing to a position suitable for vibration prevention. At this time, displacement signals indicating the current position of the bearing from each displacement meter are fed to the position control section to guide the bearing to a more accurate proper position.

EXAMPLE Hereinafter, an example of the present invention will be described based on FIGS. 1 and 2. In addition, both side bearings (5) of the rigid joint (rigid calapricif) (7) that aligns with the bearing of the present invention
(5) Applies to Part. In Fig. 1, (b) is a bearing that rotatably supports the shaft part (6) on the turbine side, and is composed of a bearing body (6) and a housing σ having a square outer circumferential surface. . (G) is a rectangular frame placed around the outer periphery of the bearing (B). Note that the frame and housing σ4 are structured so that they can be divided into upper and lower halves for ease of assembly.

(16A) to (16D) are electro-hydraulic actuators (hereinafter simply referred to as actuators) having servo valves fixed to the top, bottom, left and right positions of the inner peripheral surface of the frame, and each of the actuating rods (17A) to (17D) ) is housing α◆
are engaged with the respective outer circumferential surfaces (18A) to (18D) through slides (to), respectively. Therefore, the above bearing (b), that is, the housing α◆ has 4 actuators (1
6A) to (16D), and the housing α→ is held so as to be movable horizontally and vertically with respect to the actuator units (16A) to (16D) (20A) to
(20D) is each actuator (16A) to (16D)
with a displacement meter attached to each actuator (16A)
- (160) and the respective outer peripheral surfaces (18A) - (18D) of the corresponding housing I)04 are detected. In addition, the above displacement meter (2OA) ~ (
20D) may be attached to the frame μs, for example. (2
) is a control device that controls the movement of the actuating rods (17A) to (17D) of each of the actuators (16A) to (160). It is configured.

The vibration calculation unit 4 has a vibration abnormality diagnosis function, pre-calculated vibration characteristic data of the target axis system, etc., and is used to generate abnormal vibrations based on the input vibration signal 'ij (a). Further, the position control S (e) is for receiving the position signal and outputting control signals (bt) to (b,) to each servo valve of the actuator (16A) θ■). Moreover, the displacement signals 8 (cI) to (C4) from each displacement #F (20A) to (20D) are at the above level r! ! ! It is fed back to the control section (to). Furthermore, the oil pressure source (2) supplies high pressure oil to each actuator (16A) to (t6D), and is controlled by the position control S@.

Therefore, when the turbine is driven, if the bearing (b) position is misaligned, the vibration of the shaft part will change, or an abnormality will occur. This abnormal vibration isolation #ll signal (a) is input to the vibration calculation unit 4 via the vibration detector (shown in Figure 2) (e), and is compared with the preset vibration characteristics here. and calculate in which direction it is shifted. This calculated value is then used as a position signal by the position control unit (1
), and the control signals (bl) to (b4) corresponding to this position signal 8 are output to the servo valves of each actuator (16A) to (t6D) to prevent the bearing (6) from vibration. Move it to the desired position.

Also, at this time, displacement signals (CI) to (C
4) is fed back to the position control unit), and the bearing α
This is to guide η to a more accurate proper position. In addition,
When the bearing (6) is in a desirable position for vibration prevention, the vibration signal Jij is input to the vibration calculation unit (a), and the position control sg3 outputs a position signal to maintain the position. has been done.

By the way, the shaft vibration targeted here is the lateral vibration of the shaft, which is a common problem in turbines, turbo compressors, etc.
(bending vibration IJ), and due to poor alignment, an abnormal #i movement that does not occur under normal alignment occurs. For example, changes in bearing characteristics may cause an increase in vibration components that are synchronized with the shaft rotation speed, the occurrence of self-excitation assistance such as oil whip, or the occurrence of higher-order vibration components that are asynchronous to rotation. symptoms occur. Conventionally, symptoms caused by alignment have been detected as static loads and pre-loads acting on the bearing using an O-Docell installed in the bearing stand, but this is more difficult than due to shaft vibration as described above. The symptoms cannot be detected more directly and with high precision.

Effects of the Invention According to the configuration of the present invention described above, the bearing supporting the shaft portion of the rotor is held via the actuators arranged on the four sides thereof, and the control arrangement controls each of these actuators based on the vibration of the shaft portion. Since this is provided, it is possible to cope with any positional deviation.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a schematic configuration of an embodiment of the present invention, and FIGS. 2 and 3 are diagrams showing an overall schematic configuration of a data system.
The figures are diagrams relating to the present invention and a conventional example, and FIG. 3 is a diagram relating to a conventional example. (b) Bearing, (2) Shaft, (16A) to (
16D)...actuator, (18A) to (18D
)...Outer circumferential surface, (2OA) to (20D)...Displacement meter, (B)...Control device, (A)...Vibration calculation unit, ■
...Position control unit, ■...Hydraulic pressure source, (to)...Vibration detector Fig. 2

Claims (1)

[Claims] 1. Each of the four outer circumferential surfaces of the bearing that supports the rotor shaft is supported via an actuator, and a displacement meter is installed to detect the relative displacement between each actuator and each outer circumferential surface of the corresponding bearing. and a control device for controlling the operation of each of the actuators, further comprising a vibration calculation section that calculates a positional deviation of the bearing based on a vibration signal from a vibration detector of the shaft of the rotor; and a position control section that outputs an actuator operation signal to the actuator drive section based on the position signal from the calculation section, and the displacement signal from the displacement meter is fed back to the position control section during control. Features: Automatic bearing alignment adjustment device.