KR20170002398U

KR20170002398U - Balancing shaft structure

Info

Publication number: KR20170002398U
Application number: KR2020150008496U
Authority: KR
Inventors: 김봉기; 박성욱
Original assignee: 주식회사 한국가스기술공사
Priority date: 2015-12-24
Filing date: 2015-12-24
Publication date: 2017-07-04

Abstract

The present invention is based on the fact that the balancing operation is performed by using centrifugal force deviation by angle by arbitrarily adjusting the fastening depth of the weight screw fastened to each assembly hole, The present invention relates to a balancing shaft structure having improved structure so that a worker can be prevented from being injured and a balancing operation can be performed easily and safely.

Description

{BALANCING SHAFT STRUCTURE}

The present invention relates to a balancing shaft structure, and more particularly, to a balancing shaft structure which is simple and easy to perform balancing operation without damaging a product during a dynamic balancing operation of a shaft itself of a rotating body applied to a rotating machine such as an impeller, The present invention relates to a shaft structure for a balancing machine,

Generally, in a rotating machine equipped with a rotating body, it is necessary to correct the mass unbalance generated in the rotating body to suppress the vibration, and the work of correcting the mass unbalance in the rotating body is called universal balancing.

Generally, the balancing method can be classified into a single-face balancing method and a double-sided balancing method according to the number of calibration surfaces on which balancing is performed. Also, the balancing method can be divided into rigid rotating balancing and elastic balancing depending on the characteristics of the rotating body.

The various balancing methods described above are used to manually off-line balance the mass unbalance present in the rotating body by using a number of additional equipments. In practice, balancing is performed in the manufacturing process of the rotating body, In the operating site, balancing of the rotating body is performed after the operation of the rotating machine is stopped.

However, the balancing methods described above can not be applied to rotating bodies, i.e., centrifuges, washing machines, and the like, which vary in degree of mass unbalance at every rotation operation, and can be applied to on- Balancing method is needed.

As mentioned above, on-line balancing, which can actively control mass unbalance, can be realized by attaching a balancing head to the rotating body. This balancing head was installed in Leblanc around 1900 This balancing head is equipped with a concentric orbit or tube on the outside of the rotating body and is filled with mercury so that when the rotating speed is higher than the critical speed of the rotating body the mercury is moved to the opposite side of the unbalanced mass and is automatically balanced Was.

However, since this balancing head has the property that the mercury is evenly distributed in the circumferential direction, the effect of complete balancing can not be obtained.

A balancing head for active control of the mass unbalance of the rotating body has been developed by van de Vegte in the 1960's and various types of devices have been developed. A rotating table of a semiconductor wafer drier such as a magnetic bearing for actively controlling vibrations of a rotating body of a self balancer composed of a ball and a circular track for automatic balancing of the rotating body, The rotating table balancing device of the semiconductor wafer drier has an effect of suppressing the vibration of the rotating body to some extent. However, when the rotation of the rotating body is required in a state close to non-vibration, And there is a problem that a lot of energy is required for control.

Prior art related to the conventional balancing apparatus is a system in which a plane parallel to the rotating table is provided as disclosed in Korean Patent Registration No. 10-0130861 entitled " Rotating Table Balancing Apparatus of Semiconductor Wafer Dryer "(Registered on Nov. 24, 1997) A frame; A pair of rotating table mass unbalance detecting means installed in the frame so as to detect a mass unbalance state of the positional portion corresponding to the rotational center axis of the rotating table by an electrical signal; A pair of driving sources mounted on the frame; A control unit connected to the detecting means and the driving source so as to respectively control driving of the driving source according to the signal detected by the detecting means; A pair of balancing masses provided so as to be positioned on a straight line passing through a rotation center axis of the rotary table; And a pair of conveying means mechanically connected to the driving source for moving the balancing masses in the radial direction of the rotating table, respectively, so that the mass unbalance of the rotating table is controlled by the position control of the balancing masses And is rotationally driven in a balanced and balanced state.

Another prior art of the existing balancing apparatus is disclosed in Korean Patent Registration No. 10-0250314 entitled " balancing system of crankshaft "(registered on January 23, 2000) A balancing weight is provided on the first web, the third web, the fourth web, the sixth web, the seventh web and the ninth web of the crankshaft from the front side of the engine.

Conventional balancing devices mainly employ a method of balancing by cutting or weighting one side of the shaft in order to maintain a dynamic balancing state. However, in this case, when the balancing operation must be repeatedly performed over time Which is not only cumbersome but also takes a long time to perform the balancing correction operation.

Korean Patent Registration No. 10-0130861 entitled "Rotating Table Balancing Device of Semiconductor Wafer Dryer" (Registered on Nov. 24, 1997) Korean Patent Registration No. 10-0250314 entitled "Balancing system of crankshaft" (registered on January 23, 2000)

The object of the present invention is to solve the above problems and to provide a method and apparatus for dynamic balancing of a shaft of a rotating body applied to a rotating machine such as an impeller and a blower, And to provide a balancing shaft structure with improved structure so that balancing operation can be performed simply and easily without damaging the shaft structure.

According to an aspect of the present invention, there is provided a balancing shaft structure for calibrating an axial imbalance of a rotating body, comprising: a master shaft having a screw portion formed through a shaft of the rotating body and a lock nut; And a weight screw for correcting unbalance using a centrifugal force varying depending on a distance of fastening and fastening to the respective assembly holes, .

The outer periphery of the master shaft on which the plurality of assembly holes are formed is knurled to prevent slippage, and the plurality of assembly holes are formed to be spaced apart from each other in the center of the master shaft.

The outer periphery of the lock nut is knurled to prevent slipping.

The present invention is based on the fact that the balancing operation is performed by using centrifugal force deviation by angle by arbitrarily adjusting the fastening depth of the weight screw fastened to each assembly hole, It is possible to prevent a worker from being injured and advantageous in that a balancing operation can be performed easily and safely without damaging the product.

1 is a perspective view showing a configuration of a shaft structure for balancing according to the present invention;
Fig. 2 is a front view of the master master shaft; Fig.
Figure 3 is a cutaway view of the critical region of Figure 2;

1 to 3, a balancing shaft structure for correcting unbalance of a shaft 10 of a rotating body is provided. The balancing shaft structure includes a shaft 10 and a lock nut A plurality of assembly holes 210 formed through the outer periphery of the master shaft 100 and formed with threads on the inner circumferential surface of the master shaft 100, And a weight screw 220 for calibrating unbalance using a centrifugal force varying according to a distance of fastening and fastening to the respective assembly holes 210.

The master shaft 100 has a threaded portion 110 formed in a left-handed manner along the outer circumference to prevent the rotation of the master shaft 100, and has a solid-type shaft structure.

The master shaft 100 is spaced apart from the screw 110 by a predetermined angle around the outer periphery of the screw shaft 110. The master shaft 100 has a plurality of assembly holes 210 Is formed.

The plurality of assembly holes 210 are formed in four directions from the outer side of the master shaft 100 to the center, and have a threaded structure in which the weight screws 220 are fastened to the inner peripheral surface.

The centrifugal force of each of the weight screws 220 varies depending on the depth of the assembly of the weight screws 220. The centrifugal force of the weight screw 220 decreases as the depth of the shaft 220 gradually increases toward the inside of the shaft center direction, .

This principle is proved through the following.

F = mr? 2 (F: centrifugal force, m: mass, r: radius,?: Angular velocity)

Accordingly, by adjusting the tightening depth of the weight screw (220) fastened to the assembly holes (210) formed for each angle of the master shaft (100) when the rotating shaft of the rotating machine is unbalanced in weight, Balancing can be performed to eliminate the imbalance.

The outer periphery of the master shaft 100 on which the plurality of assembly holes 210 are formed is knurled to prevent slipping and the outer circumferential portion of the lock nut 300 is knurled to prevent slipping.

In the present invention, after the rotation shaft of the rotating machine is connected to the master shaft 100 by using the lock nut 300, the weight of each of the assembly holes 210 formed apart from each other along the outer periphery of the master shaft 100, The centrifugal force is varied according to the fastening depths of the weight screws 220 with respect to the assembly hole 210 during tightening of the screw 220. Therefore, dynamic unbalance of the rotor shaft can be obtained by finely adjusting the centrifugal force for each angle of the master shaft 100 The balancing operation can be performed so as to prevent the occurrence and to maintain the balance.

Therefore, in the present invention, during the conventional balancing operation, it is not necessary to cut off any one side of the shaft and to loosen or balance the weight by partially loosening the weight by attaching the weights, but the tightening depth of the weight screw 220 fastened to each assembly hole 210 The balancing operation is performed by using the centrifugal force deviation according to the angle. Therefore, it is possible to prevent a case in which the weight is unbalanced as in the case of the existing weight mounting type, or the operator is injured in the dropped weight, It has an advantage that the work can be performed.

10: axis of rotating body 100: master shaft
110: screw part 210: assembly hole
220: weight screw 300: lock nut

Claims

A balancing shaft structure for calibrating an unbalance of an axis (10) of a rotating body,
A master shaft 100 connected to the shaft 10 of the rotating body through a lock nut 300 and having a thread 110,
A plurality of assembly holes 210 formed perforations around the outer periphery of the master shaft 100 and formed with threads on an inner peripheral surface thereof,
And a weight screw (220) for calibrating unbalance using a centrifugal force varying according to a distance of fastening and fastening to the respective assembly holes (210).

The master shaft according to claim 1, wherein an outer periphery of the master shaft (100) in which the plurality of assembly holes (210) are formed is knurled to prevent slippage, and the plurality of assembly holes (210) Wherein the first shaft portion and the second shaft portion are spaced apart from each other.

The balancer shaft structure according to claim 1, wherein the lock nut (300) is knurled to prevent slipping.