A dynamic balance counterweight angle positioning device suitable for a main pump motor of a nuclear power plant

Abstract

The present application belongs to the technical field of nuclear power plant detection and maintenance, and particularly relates to a dynamic balance counterweight angle positioning device suitable for a main pump motor of a nuclear power plant, comprising a positioning instrument inner ring installed on the lower part of the motor shaft, a positioning instrument outer ring installed on the outside of the positioning instrument inner ring, and a laser ray instrument installed on the outer ring of the positioning instrument and located on the outer edge. The device realizes accurate and rapid positioning of the counterweight angle position, eliminates the error caused by visual estimation when the counterweight angle is calibrated on site, makes the counterweight angle consistent with the theoretical calculation result, maximally guarantees the implementation effect of dynamic balance adjustment, and makes the dynamic balance adjustment successful at one time. In addition, the device can avoid error accumulation of the actual counterweight position, keep the calculation correctness of the influence coefficient of the subsequent main pump motor dynamic balance, and make the influence coefficient correctly represent the vibration characteristics of the main pump motor.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of nuclear power plant detection and maintenance, and particularly relates to a dynamic balance weight angle positioning device suitable for a main pump motor of a nuclear power plant. BACKGROUND

[0002] A primary coolant pump of a certain nuclear power plant is a vertical double-speed three-phase asynchronous squirrel cage motor, and the motor is connected with the main pump body through a torsion bar coupling. Before and after each maintenance of the unit, the vibration state of the motor will change to a certain extent, and the vibration is high. Therefore, after each maintenance, dynamic balance adjustment needs to be carried out according to the vibration state of the main pump motor.

[0003] During the implementation of dynamic balance of the main pump motor in the past, due to the large diameter of the motor flywheel and the small diameter of the motor rotating shaft, the distance between them is far, and the size difference is large, so that in actual operation, there is a lack of effective positioning means, and it is difficult to accurately position the installation angle of the weight block on the flywheel according to the zero mark on the motor rotating shaft, which affects the implementation effect of the dynamic balance of the main pump motor.

[0004] The main influences are as follows:

[0005] 1) The actual angle positioning of the weight is difficult, and currently the weight angle is only visually estimated during on-site calibration, which has a certain deviation from the theoretical calculation result, affecting the dynamic balance adjustment effect;

[0006] 2) There is a deviation between the actual weight position and the theoretical calculation position, which affects the calculation of the influence coefficient of the subsequent main pump motor dynamic balance, and the long-term error accumulation will cause the calculated influence coefficient to be unable to correctly represent the vibration characteristics of the main pump motor;

[0007] 3) Due to the large visual error, the first adjustment is unsuccessful, which affects the maintenance progress and increases the additional economic cost, and at the same time, the multiple adjustments also increase the stay time of personnel in the maintenance site, increasing the unnecessary radiation risk. SUMMARY

[0008] The application aims to provide a dynamic balance weight angle positioning device suitable for a main pump motor of a nuclear power plant, which can accurately position the dynamic balance weight angle.

[0009] The technical scheme of the application is as follows:

[0010] A dynamic balance weight angle positioning device suitable for a main pump motor of a nuclear power plant, comprising a positioning instrument inner ring installed on the lower part of the motor rotating shaft, a positioning instrument outer ring installed outside the positioning instrument inner ring, and a laser ray instrument installed on the positioning instrument outer ring and located at the outer edge;

[0011] The positioning instrument inner ring is marked with an adjustment scale;

[0012] The inner ring of the positioner is attached to the lower part of the motor shaft side;

[0013] The inner ring and the outer ring of the positioner can keep relative movement in the circumferential direction.

[0014] The outer ring of the positioner is provided with a level.

[0015] The inner ring of the positioner is composed of two identical half rings, which enclose the lower part of the motor shaft and are fixed.

[0016] The outer ring of the positioner is composed of two identical half rings, which enclose the inner ring of the positioner and are fixed.

[0017] The inner ring of the positioner is provided with a concentric circular guide rail, and the outer ring of the positioner is provided with an inner ring roller; the inner ring roller is installed on the circular guide rail and slides along the circular guide rail.

[0018] The two parts of the outer ring of the positioner are fixed by outer ring locking bolts.

[0019] The two parts of the inner ring of the positioner are fixed by inner ring locking bolts.

[0020] After the level is placed on the outer ring of the positioner and corrected, the laser ray instrument is set to vertical mode.

[0021] The significant effects of the present application are as follows: the precise and rapid positioning of the counterweight angle position is achieved, the errors caused by visual estimation during on-site calibration of the counterweight angle are eliminated, the counterweight angle is consistent with the theoretical calculation result, the implementation effect of dynamic balance adjustment is maximized, and the dynamic balance adjustment is successful once; in addition, the error accumulation of the actual counterweight position is avoided, the calculation correctness of the influence coefficient of the subsequent main pump motor dynamic balance is maintained, and the vibration characteristics of the main pump motor can be correctly represented.

[0022] The device as a whole adopts an inner and outer ring design, the inner ring is engraved with a scale disc and is installed on the lower part of the motor shaft, and the outer ring is provided with a laser positioner. After installation, the laser instrument (which can project 360°) is turned on, and the angle is positioned by rotating the outer ring. The whole positioning device is easy to operate, and the deviation of the angle positioning accuracy needs to meet the requirement of not more than ±5°.

[0023] At the same time, in order to avoid scratching and grinding damage to the motor shaft body, a protective gasket (made of rubber or other materials) needs to be added inside the positioning device to protect the motor shaft.

[0024] (1) The device is detachable, simple in structure, easy to assemble, disassemble and use, small in size, and strong in portability;

[0025] (2) Set up micro level, convenient to adjust the levelness;

[0026] (3) Set up inner and outer rings, connect through guide rail roller, cooperate with the laser ray instrument installed on the outer ring, can realize 360° dead angle positioning in full space;

[0027] (4) Set up scale disc at inner ring, set up pointer on outer ring, when rotating the outer ring, can read the rotating angle in real time, positioning is accurate and fast;

[0028] (5) Inner ring inlay rubber ring, increase the friction and fastening without damaging the shaft;

[0029] (6) Laser instrument itself sets up control button, can adjust the ray mode, realize the switching of horizontal plane / plumb plane positioning mode;

[0030] (7) Laser instrument has detachability and replaceability, convenient to maintain. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 It is installation schematic drawing of dynamic balance weight angle positioning device suitable for nuclear power plant main pump motor;

[0032] Figure 2 It is top view sectional view of dynamic balance weight angle positioning device suitable for nuclear power plant main pump motor;

[0033] Figure 3 It is side view of dynamic balance weight angle positioning device suitable for nuclear power plant main pump motor;

[0034] In the drawing: 1. motor lower shaft; 2. positioning instrument inner ring; 3. positioning instrument outer ring; 4. inner ring locking bolt; 5. outer ring locking bolt; 6. level; 7. outer ring inner roller; 8. laser ray instrument; 9. circular track. DETAILED DESCRIPTION

[0035] The application will be further described by the drawings and specific embodiments.

[0036] As shown in Figure 1 , Figure 2 and Figure 3 , the dynamic balance weight angle positioning device comprises:

[0037] Positioning instrument inner ring 2 installed outside the motor lower shaft 1, positioning instrument outer ring 3 installed outside the positioning instrument inner ring 2, level 6 installed on the positioning instrument outer ring 3, and laser ray instrument 8 installed on the positioning instrument outer ring 3 and located at the outer edge.

[0038] The above-mentioned positioning instrument inner ring 2 is composed of two identical half rings, which enclose the motor lower shaft 1 and are fixed through inner ring locking bolt 4;

[0039] Similarly, the above-mentioned locator outer ring 3 is composed of two identical half rings, which wrap around the locator inner ring 2 and are fixed by the outer ring locking bolts 5;

[0040] like Figure 2 As shown, a concentric circular guide rail 9 is mounted on the outside of the aligner inner ring 2, on which outer ring inner rollers 7 are mounted. These outer ring inner rollers 7 are fixedly mounted inside the aligner outer ring 3 and are evenly distributed along the circumference. The relative movement of the outer ring inner rollers 7 and the circular guide rail 9 allows the aligner inner ring 2 and aligner outer ring 3 to maintain relative movement in their respective circumferential directions.

[0041] During installation, first hold the inner ring 2 of the locator on the lower shaft 1 of the motor, then install the inner ring locking bolt 4 and tighten it with a wrench so that the inner ring 2 of the locator fits on the lower shaft 1 of the motor;

[0042] Then install the locator outer ring 3, making sure that the inner roller 7 of the outer ring is embedded in the guide rail of the locator inner ring 2;

[0043] Then install the outer ring locking bolt 5 and tighten the positioner outer ring 3 with a wrench;

[0044] Rotate the outer ring 3 of the locator. If it can rotate smoothly without any obstruction, it means that the inner ring 2 and outer ring 3 of the locator are properly installed.

[0045] Install the laser ray meter 8 on the outer ring 3 of the positioning instrument;

[0046] Place the level 6 on the outer ring 3 of the locator and fine-tune the level of the installed locator according to the instructions until the bubble in the level 6 moves to the middle of the peek window.

[0047] During the trial period, when performing angle positioning,

[0048] a. Confirm that all locators have been installed and the levelness has been calibrated;

[0049] b. Turn on the laser ray meter 8 and set the positioning mode to vertical mode;

[0050] c. According to the angle required by the dynamic balancing weight, refer to the scale reading on the inner ring 2 of the locator and rotate the outer ring 3 of the locator at a constant speed to the required angle;

[0051] e. After the outer ring 3 of the positioning instrument is selected in place, mark the position indicated by the laser ray meter 8 at this time to complete the angle positioning.

[0052] When dismantling, first turn off the laser ray meter 8 and remove it, then remove the outer ring locking bolt 5 and remove the locator outer ring 3; remove the inner ring locking bolt 4 and remove the locator inner ring 2.

Claims

1. A dynamic balancing weight angle positioning device suitable for the main pump motor of a nuclear power plant, characterized by: It comprises a positioning instrument inner ring (2) mounted outside the lower rotating shaft (1) of the motor, a positioning instrument outer ring (3) mounted outside the positioning instrument inner ring (2), and a laser ray meter (8) mounted on the positioning instrument outer ring (3) and located at the outer edge; The inner ring (2) of the positioning instrument is marked with an adjustment scale; The inner ring (2) of the positioning instrument is attached to the side of the lower rotating shaft (1) of the motor; The locator inner ring (2) and the locator outer ring (3) are capable of maintaining relative movement in their respective circumferential directions; The inner ring (2) of the positioning instrument is composed of two identical half rings, which enclose the lower rotating shaft (1) of the motor and are fixed in place. The positioning instrument outer ring (3) is composed of two identical half rings, which enclose the positioning instrument inner ring (2) and the two parts are fixed; A concentric circular guide rail (9) is installed on the outer side of the inner ring (2) of the positioning instrument, and an outer ring inner roller (7) is installed on the outer ring (3) of the positioning instrument; the outer ring inner roller (7) is installed on the circular guide rail (9), and the outer ring inner roller (7) slides along the circular guide rail (9); A level (6) is provided on the outer ring (3) of the positioning instrument; The level meter (6) is placed on the outer ring (3) of the positioning instrument to calibrate its level, and the laser ray meter (8) is set to a vertical mode.

2. The dynamic balancing weight angle positioning device for a main pump motor in a nuclear power plant according to claim 1, characterized in that: Use the outer ring locking bolts (5) to fix the two parts of the locator outer ring (3).

3. The dynamic balancing weight angle positioning device for a main pump motor in a nuclear power plant according to claim 1, characterized in that: Use the inner ring locking bolts (4) to fix the two parts of the locator inner ring (2).

Images