Static balance eccentric milling fine counterweight process method for pumped storage rotating wheel

A process method and a pumped-storage technology, applied in the field of machinery, can solve the problems of the unbalanced moment index, the influence of the strength of the runner, and the low calculation accuracy, and achieve the effect of improving the efficiency and accuracy of the counterweight.

Active Publication Date: 2020-11-03

HARBIN ELECTRIC MASCH CO LTD

7 Cites 2 Cited by

AI-Extracted Technical Summary

Problems solved by technology

[0003] At present, the static balance of the pumped storage runner adopts two methods of drilling to remove weight and offsetting the weight. The drilling and offsetting method has an impact on the strength of the runn...

Abstract

The invention discloses a static balance eccentric milling fine counterweight process method for a pumped storage rotating wheel. The method is that the de-weighting moment of the rotating wheel at the key position is equal to the unbalanced moment. The pumped storage rotating wheel has the characteristics of small size, high rotating speed and the like, and the counterweight difficulty of the pumped storage rotating wheel lies in that the counterweight of the small-size rotating wheel is difficult to meet the requirements for high precision and low residual unbalanced moment, so that the counterweight difficulty of the pumped storage rotating wheel is how to realize high-precision counterweight balance. The high-precision requirement of the counterweight can be met through eccentric milling counterweight, and the key step is that the eccentric milling contour size of the rotating wheel is accurately calculated according to the unbalanced moment and numerical control eccentric millingmachining is conducted. Compared with a drilling de-weighting method and a deviated turning de-weighting method which are adopted at present, the deviated milling counterweight method can overcome thedefect that drilling de-weighting affects the strength of the rotating wheel; and meanwhile, the defects of low deviated turning de-weighting precision and long machining period can be avoided. The method has the advantages of being easy to popularize, short in period, high in machining efficiency and high in balance weight precision.

Application Domain

Geometric CADStatic/dynamic balance measurement +6

Technology Topic

Drill holeControl engineering +2

Image

Examples

Experimental program(1)

Example Embodiment

[0053] like figure 1 , figure 2 As shown, a turbine pumping energy storage wheel static balance biased finifier, the operation steps are as follows:

[0054] 1) The runner 1 is connected to the balance flange 2 by the coupling bolt 3, and the balance flange 2 is placed onto the support base 5;

[0055] 2) The bottom plane of the wheel 1 measures the distance between the bottom of the rotary 1 and the ground, the lowest point of the rotary 1 is measured, that is, the focus position of the rotary 1, in the focus position 180 The direction of the direction is a tap position, and the rotary 1 is light, the key position is marked on the top of the wheel 1 on the top of the wheel 1;

[0056] 3) Place the horizontal feet 4 on the top of the runner 1, and placed the weight in the rotary 1 light point position until the level of the four positions is full, according to the weight and weight of the weight. The wheel is not equilibrium the torque at the center of the wheel center;

[0057] 4) Establish a mathematical relationship between the runner uneven torque value and the biasing fan mass and sector center of gravity to the force arm distance of the wheel center: t = mgl

[0058] In:

[0059] M: Runner biasing fan quality;

[0060] G: gravity acceleration constant;

[0061] l: The strength of the sector center to the center of the runner;

[0062] T: Turner is unbalanced torque;

[0063] 5) image 3 As shown in the cross-sectional cross-sectional cross-sectional cross-sectional pattern according to the biasing fan, the force arm distance of the center of gravity to the center center of the rotary center is calculated:

[0064]

[0065] In:

[0066] R: Turner outer radius;

[0067] K: The chamfered edge of the wheel of the runner;

[0068] W: Runner biasing fan shaped radius;

[0069] θ: half of the angle of the biasing fan-shaped angle;

[0070] 6) Figure 4 As shown, the mathematical relationship derived by the deflecting fan-shaped volume is:

[0071]

[0072]

[0073]

[0074] In:

[0075] V 1 : The volumetric volume of the biased fan-shaped triangular cross section;

[0076] V 2 : The volumetric volume of the triangular cross section constituting the filament section;

[0077] V 3 : The volume of the annular body composed of biased fan-shaped cross section;

[0078] H: Milling fan thickness, h = (k + w) TAN U;

[0079] u: fixed angle;

[0080] θ: half of the angle of the biasing fan-shaped angle;

[0081] 7) Division to establish a mathematical relationship between the biasing fan-shaped radius W, the sector angle θ, the sector thickness H, and the imbalance torque T:

[0082] T = ρV 3 GL

[0083] In:

[0084] ρ: stainless steel metal density constant;

[0085] G: gravity acceleration constant;

[0086] V 3 : Milling fan-shaped volume;

[0087] L: The force of the biasing fan shape to the center of the wheel center;

[0088] By deriving a mathematical relationship between the four parameters of the steering wheel unbalanced torque T and the sector radius W, the fan-shaped angle θ, the partial milling fan thickness H can accurately obtain the contour size of the biased fan shape;

[0089] 8) Put the runner 1 onto the CNC milling machine, and perform position adjustment to align the rotator 1 key position and the center line of the milling machine main shaft 8;

[0090] 9) The main shaft 8 to the reference line is symmetrically biased according to the contour size symmetrical biased machining in the baseline.

[0091] 10) After the mounting of the rotary 1 is completed, it is equipped to the balance tool to perform the balance, the trim, the wheel 1 is connected by the coupling bolt 3 and the balance flange 2, and the balance flange 2 is hoist to the support base 5 The horizontal ruler 4 is placed on the top of the runner 1 to view the horizontal ruler 4 reading. If the horizontal ruler 4 is not flat, the weight is added to the rotary 1 tap, until the horizontal level 4 is horizontally 4, the weight of the weight is multiplied by the distance from the center of the runner 1 to the rotator residue. Unbalanced torque.

[0092] The above is only an example of the present invention, and is not intended to limit the invention, any modifications, equivalents, and improvements made within the spirit and principles of the present invention, should be included within the scope of the invention.

PUM

Description & Claims & Application Information

We can also present the details of the Description, Claims and Application information to help users get a comprehensive understanding of the technical details of the patent, such as background art, summary of invention, brief description of drawings, description of embodiments, and other original content. On the other hand, users can also determine the specific scope of protection of the technology through the list of claims; as well as understand the changes in the life cycle of the technology with the presentation of the patent timeline. Login to view more.