A method for measuring residual unbalance of rotor dynamic balancing

Abstract

The invention discloses a method for measuring the residual unbalance of a rotor dynamic balance, which belongs to the technical field of vibration and control dynamic balance of rotating machinery. The invention performs dynamic balancing on a rotor so that its residual unbalance reaches the accuracy specified in the rotor process specification, and reads the phases α1 to α1 of the residual unbalance on the balancing surfaces 1 to n. n ; Secondly, add counterweights at the phase position on the balancing surface, repeatedly turn the balancing machine on and off several times and read the new residual unbalance size and phase, calculate the average value of the residual unbalance size and phase, and obtain the precise value of the residual unbalance by calculation. Compared with the traditional method of obtaining the residual unbalance, the present invention can eliminate the influence of vibration noise on the reading of the dynamic balancing machine without additional special equipment, improves the accuracy of the residual unbalance measurement, and greatly reduces the difficulty and cost of obtaining the precise value of the residual unbalance.

Description

Technical Field

[0001] The invention relates to the technical field of rotating machinery vibration and controlled dynamic balance, and in particular to a method for measuring the residual unbalance amount of rotor dynamic balance. Background Art

[0002] Rotating machinery is a mechanical device that relies on rotation to achieve specific functions. It is widely used in the electric power, petrochemical, metallurgy, aerospace and other sectors. The rotor system is the core component of rotating machinery to achieve kinetic energy generation and transmission. Unbalanced excitation is the core factor that causes rotor vibration, which often causes violent vibration of rotating machinery, affecting its safety, reliability, life and performance. Therefore, rotor dynamic balancing is a key link in the manufacturing and assembly process of rotating machinery. However, the existing dynamic balancing machines are limited by accuracy, environmental vibration and noise, etc., and often cannot obtain the precise value of the remaining imbalance after the rotor is balanced, which seriously affects the formulation of vibration control and fault diagnosis measures for rotating machinery.

[0003] At present, the acquisition of the residual unbalance after rotor balancing mainly relies on the reading of the dynamic balancing machine. The dynamic balancing machine obtains the vibration signal through the vibration sensor, and calculates the residual unbalance through the dynamic balancing algorithm after processing. The accuracy of the obtained residual unbalance is not high. The traditional method of obtaining the accurate value of the residual unbalance requires the cooperation of high-precision vibration sensors and dedicated low-noise dynamic balancing workshops, which leads to a sharp increase in the cost of dynamic balancing. Summary of the invention

[0004] In view of the technical problems in the above-mentioned field that the dynamic balancing machine obtains vibration signals through vibration sensors, and the cost of calculating the residual unbalance after processing through dynamic balancing algorithms rises sharply, and the accuracy of the obtained residual unbalance is not high, the present invention proposes a method for measuring the residual unbalance of rotor dynamic balancing.

[0005] The present invention proposes a method for measuring the residual unbalance amount of a rotor dynamic balance, and the specific method steps include:

[0006] Dynamically balance the rotor to make its residual unbalance reach the accuracy specified in the rotor process specification, and read the phases α1~α1 of the residual unbalance on the balancing planes 1~n. n ;

[0007] Add counterweight m1 at phase α1 on balancing surface 1, start the balancing machine, and obtain the phase γ1 of the remaining unbalance on balancing surface 1; determine the allowable accuracy, when the phase difference |γ1-α1| is greater than the allowable accuracy, stop the machine and adjust the phase of counterweight m1 to phase γ1, restart the balancing machine until the phase difference is less than or equal to the allowable accuracy, stop the machine and determine the phase of m1 after adjustment;

[0008] Start and stop several times, record the size and phase of the remaining unbalance on the balancing plane 1 each time, and calculate its average value U1 and phase β1; keep the counterweight m1, add the counterweight m2, start and stop several times, record the size and phase of the remaining unbalance on the balancing plane 1 each time, and calculate its average value U2 and phase β2;

[0009] The value of the residual unbalance is calculated based on the magnitude and average value of the phase of the residual unbalance; wherein, the value of the residual unbalance on the balancing plane 1 is |(U2-U1)-m2|, if (U2-U1)>m2, the residual unbalance phase is (β1+β2) / 2; otherwise, it is 360°-(β1+β2) / 2;

[0010] The residual unbalance amount is measured repeatedly for the balancing planes 2 to n in sequence, and the value of the residual unbalance amount on each balancing plane is obtained.

[0011] Preferably, the phases of the residual unbalance α1 to α n Obtained through a dynamic balancing machine.

[0012] Preferably, the start and stop range is 4 to 6 times.

[0013] Preferably, the phases of the residual unbalance α1 to α n The way to take the average is to average the random noise.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] The present invention discloses a method for measuring the residual unbalance of a rotor dynamic balancing, which dynamically balances the rotor so that its residual unbalance reaches the accuracy specified in the rotor process specification, and reads the phases α1 to α1 of the residual unbalance on the balancing planes 1 to n. n; Secondly, add counterweight m1 at phase α1 on balancing plane 1, repeatedly turn on and off the dynamic balancing machine several times and read the new residual unbalance size and phase, calculate the average value of the residual unbalance size and phase, U1 and β1; keep counterweight m1, add counterweight m2 at the same position, repeatedly turn on and off the dynamic balancing machine several times and read the new residual unbalance size and phase, calculate the average value of the residual unbalance size and phase, U2 and β2; remove counterweights m1 and m2; then, subtract counterweight m2 from the difference between the two residual unbalance sizes to get the exact value of the residual unbalance on balancing plane 1, and the average value of the two measured phases is the exact value of the phase; finally, take the same operation for balancing planes 2~n. Compared with the traditional method of obtaining the residual unbalance, the present invention can eliminate the influence of vibration noise on the dynamic balancing machine readings without the need for additional special equipment, thereby improving the accuracy of the residual unbalance measurement. At the same time, it eliminates the traditional method of obtaining the precise value of the residual unbalance, which requires the cooperation of a high-precision vibration sensor and a special low-noise dynamic balancing workshop, thereby greatly reducing the difficulty and cost of obtaining the precise value of the residual unbalance. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a flow chart of the method steps of the present invention. DETAILED DESCRIPTION

[0017] The following will be combined with the attached embodiment of the present invention Figure 1 , clearly and completely describe the technical solutions in the embodiments of the present invention.

[0018] It should be understood that the terms used in the present invention are only used to describe particular embodiments and are not intended to limit the present invention.

[0019] Example

[0020] like Figure 1 As shown, the present invention proposes a method for measuring the residual unbalance amount of rotor dynamic balancing, and the specific method steps include:

[0021] S1: Dynamic balancing of the rotor: Dynamic balancing of the rotor is performed to make the residual unbalance reach the accuracy specified in the rotor process specification, and only the phases α1 to α1 of the residual unbalance on the balancing surface 1 to n are read by the dynamic balancing machine. n , r represents the rth balancing surface; dynamic balancing machine readings α1~α n Distortion may occur due to vibration and noise. The balancing machine can be started and stopped 4 to 6 times to record the average value.

[0022] S2: Measurement of the residual unbalance of balancing surface 1:

[0023] Step a: Add a counterweight m1 at phase α1 on balancing surface 1, start the balancing machine, and obtain the phase γ1 of the remaining unbalance on balancing surface 1;

[0024] Step b: Determine the allowable accuracy e. If |γ1-α1|>e, stop the machine and remove the counterweight m1, where e is the specified allowable accuracy.

[0025] Step c: Repeat steps a to b until |γ1-α1|≤e;

[0026] Step d: Start and stop 4 to 6 times, record the size and phase of the remaining unbalance on the balancing plane 1 each time, and calculate the average values ​​U1 and β1. The average value is the average of the random noise.

[0027] Step e: keep the counterweight m1, and add the counterweight m2 at m1, start and stop 4 to 6 times, record the size and phase of the remaining unbalance on the balancing surface 1 each time, calculate the average values ​​U2 and β2, and remove the counterweights m1 and m2;

[0028] Step f: The value of the residual unbalance on the balancing plane 1 is |(U2-U1)-m2|. If (U2-U1)>m2, the phase of the residual unbalance is (β1+β2) / 2; otherwise, it is 360°-(β1+β2) / 2.

[0029] S3: measuring the remaining unbalance amounts of the remaining balancing surfaces, repeating step S2 for balancing surfaces 2 to n in turn, and obtaining the value of the remaining unbalance amount on each balancing surface.

[0030] The present invention solves the problem that the existing dynamic balancing machine is limited by accuracy, environmental vibration and noise and cannot obtain the precise value of the residual unbalance after rotor balancing, and provides a precise measurement method for the residual unbalance of the rotor dynamic balancing, which does not require a high-precision vibration sensor and extremely low environmental noise, and greatly reduces the cost of obtaining the precise value of the residual unbalance after rotor balancing.

[0031] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

[0032] In addition, unless otherwise specified, all technical and scientific terms used herein have the same meanings as commonly understood by those skilled in the art in the art. All documents mentioned in this specification are incorporated by reference to disclose and describe the methods related to the documents. In the event of any conflict with any incorporated document, the content of this specification shall prevail.

[0033] It will be apparent to those skilled in the art that various modifications and variations may be made to the specific embodiments of the present invention description without departing from the scope or spirit of the present invention. Other embodiments derived from the present invention description will be apparent to those skilled in the art. The present invention description and examples are exemplary only.

Claims

1. A method for measuring the residual unbalance of a rotor dynamic balance, characterized in that: The specific steps include: Dynamically balance the rotor to make its residual unbalance reach the accuracy specified in the rotor process specification, and read the phases α1~α1 of the residual unbalance on the balancing planes 1~n. n ; Add counterweight m1 at phase α1 on balancing surface 1, start the balancing machine, and obtain the phase γ1 of the remaining unbalance on balancing surface 1; determine the allowable accuracy, when the phase difference |γ1-α1| is greater than the allowable accuracy, stop the machine and adjust the phase of counterweight m1 to phase γ1, restart the balancing machine until the phase difference is less than or equal to the allowable accuracy, stop the machine and determine the phase of m1 after adjustment; Start and stop several times, record the size and phase of the remaining unbalance on the balancing plane 1 each time, and calculate its average value U1 and phase β1; keep the counterweight m1, add the counterweight m2 at the same position, start and stop several times, record the size and phase of the remaining unbalance on the balancing plane 1 each time, and calculate its average value U2 and phase β2; The residual unbalance is calculated according to the average values ​​U1, U2 and the phases β1, β2; wherein the value of the residual unbalance on the balancing plane 1 is |(U2-U1)-m2|, and if (U2-U1)>m2, the residual unbalance phase is (β1+β2) / 2; otherwise, it is 360°-(β1+β2) / 2; The above-mentioned residual unbalance measurement is repeated for the balancing planes 2 to n in sequence to obtain the value and phase of the residual unbalance on each balancing plane.

2. The method for measuring the residual unbalance of a rotor dynamic balance according to claim 1, characterized in that: The phases of the residual unbalance α1 to α n Obtained through a dynamic balancing machine.

3. The method for measuring the residual unbalance of a rotor dynamic balance according to claim 1, characterized in that: The range of the start and stop is 4 to 6 times.

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