JPH10115567A - Low-speed balancing apparatus for heavy object - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a center-holding device such as a steel ball or the like for center-holding of a receiver base from being crushed and to eliminate the unbalance of a heavy rotating body regarding a balancing apparatus which is used when a low-speed heavy rotating body such as a water-turbine runner or the like is balanced. SOLUTION: An air pallet 3 is installed under a receiver base 2 on which a heavy rotating body 1 is placed. In order to find an offset load and its direction due to an unbalance in a state that the heavy rotating body 1 is levitated, three sensors 4 such as load cells or the like are arranged at circumferential equally divided angles at the rotating body. In addition, roller-driving devices 5 are arranged at the outer circumference of the receiver base 2, the heavy rotating body 1 is turned by them, the position of the unbalance is specified, and a precise unbalance amount is adjusted. A steel ball 6 which holds the center of the receiver base 2 is arranged just under the receiver base 2, and an oil film is formed on the steel ball 6 between the receiver base 2 to which a hydraulic pressure is applied from the lower part and the air pallet 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a balance device used for balancing a low-speed heavy rotating body such as a water turbine runner.

[0002]

2. Description of the Related Art FIG. 3 shows an apparatus used for balancing a low-speed heavy rotating body conventionally performed.

[0003] As shown in the figure, in the conventional type, an iron ball 13 is fitted to a lower portion of a core of a turntable 12 on which a low-speed heavy-rotating body 11 is mounted, and hydraulic pressure is applied from the lower portion to float the iron ball 13 on an oil film to unlock the iron ball. This device measures the balance direction and weight to obtain balance.

[0004] However, in order to support the heavy rotating body only by the iron ball 13, the load on the iron ball 13 is so large that it is not suitable as a balance device for the heavy rotating body.

[0005] Although there is a balance device as described above, the measurable weight limit of the heavy rotating body is 200 tons or less.

[0006]

By the way, in the above-mentioned prior art balancing apparatus for a heavy-weight rotating body,
The load on the support portion is large, and crushing of the support portion becomes a problem.

[0007] If the measurement limit is 200 tons or less, it is not possible to cope with a heavy-weight rotating body that is becoming large.

An object of the present invention is to solve this problem.

[0009]

According to the present invention, there is provided a heavy-weight low-speed balance apparatus according to the present invention, wherein an air pallet for floating a heavy-weight rotating body is provided below a cradle on which the heavy-weight rotating body is mounted. At the same time, three load cells and other sensors are installed at equal angles around the circumference of the heavy rotating body in order to determine the unbalanced load and its direction due to imbalance. A center holding device for holding the centers of the tables is provided.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic diagram of a low-speed balance device for heavy objects, where (a) is a side view and (b) is a plan view. FIG. 2 is an enlarged view of an iron ball and a cradle in the apparatus.

First, in FIG. 1, an air pallet 3 for suspending the heavy object rotating body 1 and the receiving table 2 is placed under the receiving table 2 on which the heavy object rotating body 1 is mounted.

In order to obtain the unbalanced load and the direction of the unbalanced load with the heavy rotating body 1 floating, sensors 4 such as three load cells are arranged at equal angles around the circumference of the heavy rotating body 1. .

Further, in order to rotate the heavy-weight rotating body 1 to improve the accuracy, roller driving devices 5 are arranged at three locations at equal angles.

In general, the amount of unbalanced load and the like can be known in a stationary state, but it is not generally known to the exact position.
The position of the unbalance can be specified by detecting one pulse by rotating, so that the amount of unbalance can be accurately adjusted. As a result, the precision can be improved by rotating the heavy-weight rotating body.

An iron ball 6 is arranged below the center of the pedestal 2 to hold the center of the pedestal 2. To form an oil film.

FIG. 2 is an enlarged view of the space between the iron ball 6 and the pedestal 2 in which oil pressure is applied to the gap between the two to form an oil film.

Next, the operation of the device of the present invention will be described. The static balance is obtained by measuring the amount of inclination of the balance object by floating the heavy object rotating body that is the balance object by the air pallet.

In addition, if the weight rotator is rotated in order to further increase the accuracy, and the unbalance amount is measured by the sensor in three directions by using an eccentric load and an eccentric position, the sensor detects one pulse, so that the eccentric load and displacement are obtained. Can be specified, the amount of unbalance at the position can be adjusted, and the unbalance of the rotating body can be eliminated, and the balance can be achieved.

[0019]

According to the heavy-weight low-speed balance apparatus of the present invention, since the heavy-weight rotating body is levitated by the air pallet, the iron ball portion does not function as a support portion for the heavy-weight material, but simply functions as a center holding device. No crushing due to load-bearing.

[0020] Further, by adopting this structure, a dynamic balance of a heavy object rotating body of 200 tons or more can be realized.

[Brief description of the drawings]

FIG. 1 is a schematic view of a balance device of the present invention, in which (a) is a side view and (b) is a plan view.

FIG. 2 is an enlarged view of an iron ball and a cradle in the same device.

FIG. 3 is a schematic view of a conventional heavy load balancing device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Heavy rotating body 2 Cradle 3 Air pallet 4 Sensor 5 Roller drive 6 Steel ball

Claims (1)

[Claims] An air pallet for suspending a heavy-weight rotating body is installed under a cradle on which a heavy-weight rotating body is to be mounted, and three load cells and other sensors are used to determine an unbalanced load and its direction due to imbalance. A low-speed balance device for a heavy object, comprising: a rotating body for a heavy object; a roller driving device for rotating the pedestal; and a center holding device for holding the center of the pedestal.