High-precision leveling method for large nuclear power diesel engine equipment mounting base

Abstract

The invention belongs to the technical field of nuclear power large-scale equipment installation, and particularly relates to a high-precision leveling method for a large-scale nuclear power diesel engine equipment installation base based on a laser tracker. Comprising the following steps: step 1, a measurement preparation stage; 2, collecting and processing data; step 3, adjusting and implementing; and 4, establishing an acceptance standard. The method has the beneficial effects that (1) a three-stage leveling process of integral fitting, board splitting adjustment and dynamic compensation is provided; (2) developing a flatness evaluation method based on point cloud registration; and (3) a laser tracker real-time three-dimensional coordinate system leveling technology is innovatively adopted.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of nuclear power large equipment installation, and particularly relates to a high-precision leveling method for a large nuclear power diesel engine equipment installation base. BACKGROUND

[0002] Traditional nuclear power diesel engine base leveling is mostly measured by using a combination of a level and a micrometer, and has the following defects: The measurement accuracy is limited (usually only 0.5 mm level can be reached); The overall flatness is difficult to control when multiple plates are spliced; It takes a long time to adjust repeatedly (about 6-8 hours for a single adjustment cycle); It depends on the experience of the operator, and there is human error; Existing laser measurement technology is mostly used for single plate leveling, lacks a multi-plate collaborative leveling method, and is difficult to meet the 0.1 mm level flatness requirement of nuclear power equipment installation. SUMMARY

[0003] The purpose of the application is to provide a high-precision leveling method for a large nuclear power diesel engine equipment installation base, which solves the technical problems of overall flatness out-of-tolerance, low adjustment efficiency, and repeated work during multi-plate combined installation.

[0004] The technical solution of the application is as follows: a high-precision leveling method for a large nuclear power diesel engine equipment installation base, comprising the following steps: Step 1: measurement preparation stage; Step 2: data acquisition and processing; The step 2 comprises: Step 21: single plate measurement 9 points are measured for each base plate, and a single plate plane equation Z=ax+by+c is calculated by the least square method, and the flatness calculation formula is δ=Max(Zi)-Min(Zi) (i=1~9); Step 22: overall fitting The measurement data collected by 6 base plates are unified to a base coordinate system, and the overall plane is fitted after removing abnormal points, and the adjustment program is triggered when the overall flatness deviation Δ is greater than or equal to 0.15 mm; Step 3: adjustment implementation; Step 4: establishment of acceptance standard.

[0005] The FARO LaserTracker Vantage laser tracker is erected in the step 1, and the technical parameters are as follows: Maximum measurement radius: 350 meters; single point measurement accuracy: ±0.05 mm; angle measurement accuracy: 0.001°; sampling frequency: 10 Hz; environmental adaptability: working temperature 5-40℃, equipped with air fluctuation compensation module.

[0006] The laser tracker in step 1 is erected within a 15-meter radius range of the center of the base, a base coordinate system is established through a total station mode, a ground level is collected as a flatness comparison reference, a 3*3 measurement grid is arranged on each base plate, the interval is determined according to 1 / 4 of the length L of the plate, the laser tracker is erected, and the measurement accuracy is set to 0.02mm / m.

[0007] The 9 points in step 2 include left, middle and right in the transverse direction and front, middle and back in the longitudinal direction.

[0008] The step 3 comprises: Step 31: single plate adjustment When delta is greater than 0.05mm, the highest point coordinate is determined as a reference, the adjustment amount of each point gasket is calculated according to the formula Delta hi=Zmax-Zi, and the 0.01mm-level stainless steel gasket is used for hierarchical adjustment; Step 32: overall adjustment: when delta is greater than 0.1mm, a deviation matrix [Delta x, Delta y, Delta z] 6*3 is established; The gradient descent method is used to calculate the adjustment priority: Priority = Sum | Delta zi | * Position Weight Coefficient; The cross adjustment is implemented: the plate with the maximum negative deviation is adjusted first, and then the plate with the positive deviation is adjusted.

[0009] The coarse adjustment in step 31 is 0.5mm-level, and the fine adjustment is 0.1mm-level.

[0010] The acceptance standard in step 4 is that the single plate flatness is less than or equal to 0.05mm, the overall flatness is less than or equal to 0.1mm, and the height difference at the joint between adjacent plates is less than or equal to 0.03mm.

[0011] The beneficial effects of the present application are that: (1) a three-level leveling process of "overall fitting-plate adjustment-dynamic compensation" is proposed; (2) a flatness evaluation method based on point cloud registration is developed; (3) a real-time three-dimensional coordinate system leveling technology using a laser tracker is innovatively adopted. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 It is a bottom plate layout and measurement point distribution schematic diagram; Figure 2 It is a laser tracker measurement system composition block diagram; Figure 3 It is a large nuclear power diesel engine equipment installation base high-precision leveling method flow chart provided by the present application based on a laser tracker. DETAILED DESCRIPTION

[0013] The present application will be further described in detail below in combination with the drawings and specific embodiments.

[0014] In the existing laser tracker equipment, the FARO Vantage series laser tracker has a ranging accuracy of ±0.05mm and an angle resolution of 0.001°, and its dynamic measurement mode supports a data update frequency of 10Hz, which is particularly suitable for real-time precision measurement in large-scale space.

[0015] The measured member is shown in Figure 1 .

[0016] As shown in Figure 3 , a large nuclear power diesel engine equipment installation base high-precision leveling method comprises the following steps: (1) Establish a dual-reference system: Local reference: Fit the "overall installation plane" through 6 bottom plate laser measurement point clouds; Global reference: Establish a ground level aligned with the equipment foundation coordinate system.

[0017] (2) Layered leveling control: Primary control: Single plate flatness ≤0.05mm (measured by 9-point grid, three-point method to determine the highest reference point); Secondary control: Overall flatness after splicing ≤0.1mm (based on least squares plane fitting).

[0018] (3) Intelligent adjustment strategy: Single plate leveling uses the "low-to-high approach", overall leveling uses the "gradient compensation method", and the laser tracker provides real-time feedback of three-dimensional coordinate data, which is integrated with the point cloud analysis module through a special analysis software (CAM2) to automatically calculate the adjustment amount.

[0019] Specifically, a large nuclear power diesel engine equipment installation base high-precision leveling method comprises the following steps: Step 1: Measurement preparation phase Set up a FARO LaserTracker Vantage laser tracker, with the following technical parameters: Maximum measurement radius: 350 meters; Single point measurement accuracy: ±0.05mm; Angle measurement accuracy: 0.001°; Sampling frequency: 10Hz.

[0020] Environmental adaptability: working temperature 5-40℃, equipped with air fluctuation compensation module.

[0021] The equipment is set up within a 15-meter radius of the center of the base, and the foundation coordinate system is established through the total station mode to collect the ground level as the flatness reference. Set up a 3x3 measurement grid on each bottom plate, with a spacing determined by 1 / 4 of the plate length L, set up the laser tracker, and set the measurement accuracy to 0.02mm / m.

[0022] Step 2: Data acquisition and processing Step 21: single board measurement 9-point measurement is performed on each base plate (left, center, right in the horizontal direction, and front, center, back in the vertical direction), and a single board plane equation Z = ax + by + c is calculated by least square method. The flatness calculation formula is: δ = Max(Z i )-Min(Z i ) (i = 1 ~ 9). Step 22: overall fitting The measurement data collected from the 6 base plates are unified to the base coordinate system, and the overall plane is fitted after manual removal of abnormal points. When the overall flatness deviation Δ is greater than or equal to 0.15 mm, the adjustment program is triggered.

[0023] Step 3: adjustment implementation Step 31: single board adjustment When δ > 0.05 mm, the highest point coordinates are determined as the reference, and the formula Δh i = Z max -Z i is used to calculate the adjustment amount of each point gasket. 0.01 mm level stainless steel gasket is used for step-by-step adjustment (coarse adjustment 0.5 mm level, fine adjustment 0.1 mm level). The above operations are performed in the measurement software provided with the (FARO Vantage series laser tracker) device. It is an inherent parameter or calculation method.

[0024] Step 32: overall adjustment: when Δ > 0.1 mm, a deviation matrix [Δx, Δy, Δz] 6 × 3 is established.

[0025] Gradient descent method is used to calculate the adjustment priority: Priority = Σ |Δz i | × position weight coefficient (edge plate weight coefficient is 1.2); Cross adjustment is implemented: first adjust the plate with the maximum negative deviation, and then adjust the plate with the positive deviation.

[0026] Step 4: acceptance standard: Single board flatness ≤ 0.05 mm, overall flatness ≤ 0.1 mm, and height difference at the joint between adjacent plates ≤ 0.03 mm.

[0027] Compared with the traditional method, the method of the present application has the following advantages: Traditional method, measurement accuracy: ± 0.5 mm; single adjustment time: 6-8 hours; personnel dependence: senior technician; environmental sensitivity: susceptible to vibration.

[0028] The method has the following advantages: measurement precision: ±0.05mm; single adjustment time consumption: ≤1 hour; personnel dependency: ordinary operator; and environmental sensitivity: self-compensation system.

Claims

1. A high-precision leveling method for a large nuclear power diesel engine installation base based on a laser tracker, characterized in that: The steps include: Step 1: Measurement preparation stage; Step 2: Data collection and processing; The step 2 includes: Step 21: Single Board Measurement Each base plate is measured at 9 points, and the plane equation of the single plate is calculated by the least square method: Z=ax+by+c. The flatness calculation formula is: δ=Max(Z i )-Min(Z i ) (i=1~9); Step 22: Overall Fitting The measurement data collected from the six base plates are unified into the basic coordinate system. After removing abnormal points, the overall plane is fitted. When the overall flatness deviation Δ ≥ 0.15mm is calculated, the adjustment program is triggered. Step 3: Adjust implementation; Step 4: Establish acceptance criteria.

2. A high-precision leveling method for a large nuclear power diesel engine mounting base based on a laser tracker as claimed in claim 1, characterized in that: In step 1, the FARO LaserTracker Vantage laser tracker is set up. The technical parameters are as follows: Maximum measurement radius: 350 meters; single-point measurement accuracy: ±0.05mm; angle measurement accuracy: 0.001°; sampling frequency: 10Hz; environmental adaptability: operating temperature 5-40℃, equipped with air fluctuation compensation module.

3. A high-precision leveling method for a large nuclear power diesel engine mounting base based on a laser tracker as claimed in claim 2, characterized in that: In step 1, the laser tracker is set up within a 15-meter radius from the center of the base. A basic coordinate system is established using the total station mode. The geoid is collected as a flatness comparison reference. A 3×3 measurement grid is set on each base plate, with the spacing determined by 1 / 4 of the plate length L. The laser tracker is set up, and the measurement accuracy is set to 0.02 mm / m.

4. The high-precision leveling method for a large nuclear power diesel engine mounting base based on a laser tracker according to claim 1, characterized in that: The 9 points in step 2 include left, center, and right in the horizontal direction, and front, middle, and back in the vertical direction.

5. The high-precision leveling method for a large nuclear power diesel engine installation base based on a laser tracker according to claim 1, characterized in that: The step 3 includes: Step 31: Single Board Adjustment When δ>0.05mm, determine the coordinates of the highest point as the reference, according to the formula Δh i =Z max -Z i Calculate the gasket adjustment amount at each point and use 0.01mm grade stainless steel gaskets for graded adjustment; Step 32: Overall adjustment: When Δ>0.1mm, establish the deviation matrix [Δx, Δy, Δz] 6×3; Use gradient descent method to calculate and adjust the priority: Priority = Σ|Δzi|×position weight coefficient; Implement cross adjustment: adjust the maximum negative deviation plate first, then adjust the positive deviation plate.

6. A high-precision leveling method for a large nuclear power diesel engine mounting base based on a laser tracker as claimed in claim 5, characterized in that: In step 31, the coarse adjustment is performed at the 0.5 mm level and the fine adjustment is performed at the 0.1 mm level.

7. The high-precision leveling method for a large nuclear power diesel engine mounting base based on a laser tracker according to claim 1, characterized in that: The acceptance criteria in step 4 are single board flatness ≤ 0.05mm, overall flatness ≤ 0.1mm, and height difference at the joints of adjacent boards ≤ 0.03mm.

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