Auxiliary device for measuring concentricity of rotor

Abstract

The device comprises a connecting plate, a fixing hole is formed in the connecting plate, a bolt is arranged in the fixing hole, a horizontal cross rod is fixedly connected to the connecting plate, a through hole penetrating from the front side to the rear side is formed in the cross rod, a measuring rod of a dial indicator is inserted into the through hole, and a vertically downward threaded hole is formed in the upper surface of the cross rod. The bottom end of the threaded hole extends downwards into the through hole, and a threaded rod is in threaded connection with the interior of the threaded hole. The scheme is used for reducing personal errors when whether the central shafts of the rotors are coaxial or not is manually measured.

Description

Technical Field

[0001] The utility model relates to the technical field of steam turbine installation equipment, in particular to a rotor concentricity measurement auxiliary device. Background Art

[0002] The steam turbine in a thermal power plant is a key piece of equipment that converts thermal energy into mechanical energy, playing a central role in the power generation process. It rotates the generator through the propulsion of high-temperature, high-pressure steam. During turbine assembly, it is crucial to ensure the coaxiality of the multiple rotors within the turbine. Currently, this coaxiality is measured manually using a dial indicator. The indicator's tip is placed on the circumference of the rotor, and the rotor is rotated, with each 90° rotation being a unit. The measurement data for each measurement point is recorded for each rotation until a full rotation is completed. This measurement data is then incorporated into a calculation formula to determine whether the rotors are coaxial. However, this method can lead to errors in the dial indicator reading if the measurement point position deviates after rotation. Furthermore, any deviation in the dial indicator's angle of detection after rotation can also lead to errors in the dial indicator reading. This deviation is considered human error. If the data deviates due to human error, the assembler may mistakenly believe the rotors are misaligned and adjust the rotors, which undoubtedly increases the workload and efficiency of turbine assembly. Therefore, in order to reduce the impact of the perceived measurement error, a rotor concentricity measurement auxiliary device is urgently needed to reduce the perceived error. Utility Model Content

[0003] The utility model aims to provide a rotor concentricity measurement auxiliary device to reduce the human error when manually measuring whether the rotor central axis is coaxial.

[0004] In order to solve the above technical problems, the utility model provides the following technical solutions: a rotor concentricity measurement auxiliary device, including a connecting plate, a fixing hole is provided on the connecting plate, a bolt is provided in the fixing hole, a horizontal cross bar is fixedly connected to the connecting plate, a through hole is provided on the cross bar which runs from the front side to the rear side, the through hole is used for inserting the measuring rod of the dial indicator, a vertical downward threaded hole is provided on the upper surface of the cross bar, the bottom end of the threaded hole extends downward into the through hole, and a threaded rod is threadedly connected to the threaded hole.

[0005] The working principle of the utility model is as follows: when in use, the connecting plate is placed on the circumference of the rotor of the steam turbine, and the fixing hole is aligned with the threaded hole on the circumference of the rotor, and then the bolt is rotated to fix the connecting plate to the rotor of the steam turbine through the bolt, and then the measuring rod of the dial indicator is inserted into the through hole, and the contact on the measuring rod is made to contact the circumferential surface of the other measured rotor, and then the threaded rod is rotated to move the threaded rod downward in the threaded hole until the bottom end of the threaded rod contacts the measuring rod, and the measuring rod is firmly held in the through hole to prevent the measuring rod from shaking. After the dial indicator is fixed, measure and read the measurement data of this point and record it as A1. Then rotate the two rotors synchronously and let the rotors rotate 90°. At this time, read the measurement data on the dial indicator and record it as A2. After recording, rotate the two rotors synchronously again and let the rotors rotate 90° synchronously and then read the measurement data on the dial indicator and record it as A3. Finally, rotate the two rotors synchronously 90° and read the measurement data on the dial indicator and record it as A4. Finally, substitute the formula for calculation. When A1+A3=A2+A4, it means that the center axes of the two rotors are coaxial. When A1+A3≠A2+A4, it means that there is a deviation between the center axes of the two rotors and the center axes of the rotors need to be adjusted. After the measurement is completed, rotate the threaded rod in the opposite direction to remove the dial indicator, and then rotate the bolt in the opposite direction to remove the connecting plate from the rotor.

[0006] Beneficial effects of the utility model:

[0007] 1. This solution uses a fixed connecting plate and cross bar, and then fixes the dial indicator for measuring the rotor in the through hole through a threaded rod. In this way, the measuring points of the dial indicator will not deviate when measuring the four points on the circumferential surface of the rotor, thereby avoiding manual errors during this part of the operation.

[0008] 2. Fix the measuring rod of the dial indicator in the through hole through the threaded rod. In this way, when the dial indicator measures four points on the circumference of the rotor, the angle of the measuring rod can be guaranteed to be consistent, thereby avoiding the error caused by different measurement angles during manual operation.

[0009] Furthermore, the connecting plate is an arc-shaped plate that fits snugly against the rotor's circumference. This allows the connecting plate to rest snugly against the rotor's circumference, while the curved surface of the arc prevents the connecting plate from shaking during rotor rotation, thereby increasing measurement accuracy.

[0010] Furthermore, a rubber layer is fixedly attached to the side of the connecting plate that contacts the rotor. The purpose of this rubber layer is to protect the rotor surface from being scratched by the connecting plate and to increase the friction between the connecting plate and the rotor surface, thereby reducing the possibility of shaking.

[0011] Furthermore, the crossbar is provided with a plurality of through holes evenly spaced along its length, so that the position of the dial indicator in the through hole can be adjusted as needed according to the distance between the two rotors and the position of the measuring point.

[0012] Furthermore, the crossbar is fixed to the connecting plate by welding. The purpose is to effectively ensure that the position between the crossbar and the connecting plate is fixed and will not change, thereby improving the accuracy of measurement. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic structural diagram of the rotor concentricity measurement auxiliary device of the utility model;

[0014] Figure 2 for Figure 1 Schematic diagram of the structure of the middle connecting plate and cross bar. DETAILED DESCRIPTION

[0015] The following is further described in detail through specific implementation methods:

[0016] The reference numerals in the drawings of the specification include: bolt 1, connecting plate 2, threaded rod 3, threaded hole 4, through hole 5, cross bar 6, fixing hole 7.

[0017] The embodiment is basically as shown in the attached Figure 1 and attached Figure 2 As shown:

[0018] A rotor concentricity measurement auxiliary device includes a connecting plate 2, which is an arc-shaped plate that fits the circumferential surface of the rotor. A rubber layer is bonded to the inner concave surface of the connecting plate 2, and the thickness of the rubber layer is 2 to 5 mm (preferably 3 mm). A fixing hole 7 is provided at the center of the connecting plate 2, and a bolt 1 is provided in the fixing hole 7. A horizontal cross bar 6 is welded to the middle position of the connecting plate 2, and six through holes 5 are provided on the cross bar 6 that extend from the front side to the rear side. The six through holes 5 are evenly spaced along the length direction of the cross bar 6. The through hole 5 is used to insert the measuring rod of the dial indicator. The upper surface of the cross bar 6 is provided with six vertically downward threaded holes 4, and the threaded holes 4 correspond one-to-one to the through holes 5. The bottom end of each threaded hole 4 extends downward to the corresponding through hole 5, and a threaded rod 3 is threadedly connected in the threaded hole 4.

[0019] The specific implementation process is as follows:

[0020] When in use, place the connecting plate 2 on the circumference of the turbine rotor, and align the fixing hole 7 with the threaded hole 4 on the rotor circumference, then turn the bolt 1 to fix the connecting plate 2 to the turbine rotor through the bolt 1, then insert the measuring rod of the dial indicator into the through hole 5, and make the contact on the measuring rod contact the circumferential surface of the other rotor to be measured, then turn the threaded rod 3 to move the threaded rod 3 downward in the threaded hole 4 until the bottom end of the threaded rod 3 contacts the measuring rod, and firmly hold the measuring rod in the through hole 5 to prevent the measuring rod from shaking. After the dial indicator is fixed, measure and read the measurement data of this point and record it as A1. Then rotate the two rotors synchronously and let the rotors rotate 90°. At this time, read the measurement data on the dial indicator and record it as A2. After recording, rotate the two rotors synchronously again and let the rotors rotate 90° synchronously and then read the measurement data on the dial indicator and record it as A3. Finally, rotate the two rotors synchronously 90° and read the measurement data on the dial indicator and record it as A4. Finally, substitute the formula for calculation. When A1+A3=A2+A4, it means that the center axes of the two rotors are coaxial. When A1+A3≠A2+A4, it means that there is a deviation between the center axes of the two rotors and the center axes of the rotors need to be adjusted. After the measurement is completed, rotate the threaded rod 3 in the opposite direction to remove the dial indicator, and then rotate the bolt 1 in the opposite direction to remove the connecting plate 2 from the rotor.

Claims

1. Rotor concentricity measurement auxiliary device, characterized by: It includes a connecting plate, a fixing hole is provided on the connecting plate, a bolt is provided in the fixing hole, a horizontal cross bar is fixedly connected to the connecting plate, a through hole is provided on the cross bar which runs from the front side to the rear side, the through hole is used for inserting the measuring rod of the dial indicator, a vertical downward threaded hole is provided on the upper surface of the cross bar, the bottom end of the threaded hole extends downward into the through hole, and a threaded rod is threadedly connected to the threaded hole.

2. The rotor concentricity measurement auxiliary device according to claim 1, characterized in that: The connecting plate is in the shape of an arc plate that fits the circumferential surface of the rotor.

3. The rotor concentricity measurement auxiliary device according to claim 2, characterized in that: A rubber layer is fixedly connected to the side of the connecting plate that contacts the rotor.

4. The rotor concentricity measurement auxiliary device according to claim 3, characterized in that: The crossbar is provided with a plurality of through holes at even intervals along its length direction.

5. The rotor concentricity measurement auxiliary device according to claim 4, characterized in that: The crossbar is fixed to the connecting plate by welding.

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