A high-precision leveling method for mounting base of large nuclear power diesel engine equipment

Abstract

The present application belongs to the technical field of nuclear power large equipment installation, and particularly relates to a large nuclear power diesel engine equipment installation base high-precision leveling method based on a laser tracker. The method comprises the following steps: step 1, a measurement preparation stage; step 2, data acquisition and processing; step 3, adjustment implementation; and step 4, establishment of acceptance standards. The present application has the beneficial effects of: (1) proposing a three-level leveling process of "overall fitting-plate adjustment-dynamic compensation"; (2) developing a planeness evaluation method based on point cloud registration; and (3) innovatively adopting a laser tracker real-time three-dimensional coordinate system leveling technology.

Description

Technical Field

[0001] This invention belongs to the field of nuclear power large equipment installation technology, specifically relating to a high-precision leveling method for the mounting base of a large nuclear power diesel engine. Background Technology

[0002] Traditional methods for leveling the base of nuclear power diesel engines often use a combination of a spirit level and a dial indicator, which has the following drawbacks:

[0003] Measurement accuracy is limited (typically only up to 0.5 mm).

[0004] The overall flatness is difficult to control when splicing multiple panels;

[0005] Repeated adjustments are time-consuming (each adjustment cycle takes about 6-8 hours).

[0006] It relies on the operator's experience and is subject to human error.

[0007] Existing laser measurement technology is mostly used for single-plate leveling, lacking multi-plate collaborative leveling methods, making it difficult to meet the 0.1mm level flatness requirements for nuclear power equipment installation. Summary of the Invention

[0008] The purpose of this invention is to provide a high-precision leveling method for the mounting base of large nuclear power diesel engine equipment, solving technical problems such as excessive overall flatness deviation, low adjustment efficiency, and numerous repetitive operations when installing multiple plates together.

[0009] The technical solution of the present invention is as follows: A high-precision leveling method for a mounting base of a large nuclear power diesel engine equipment, comprising the following steps:

[0010] Step 1: Measurement Preparation Stage;

[0011] Step 2: Data acquisition and processing;

[0012] Step 2 includes:

[0013] Step 21: Single Board Measurement

[0014] Nine measurements were taken for each base plate. The plane equation of the single plate was calculated by the least squares method: Z=ax+by+c. The flatness calculation formula is: δ=Max(Zi)-Min(Zi) (i=1~9).

[0015] Step 22: Overall Fitting

[0016] The measurement data collected from the 6 base plates are unified into the basic coordinate system. After removing outliers, the overall plane is fitted. When the overall flatness deviation Δ is ≥ 0.15mm, the adjustment program is triggered.

[0017] Step 3: Adjust and implement;

[0018] Step 4: Establish acceptance criteria.

[0019] In step 1, the FARO LaserTracker Vantage laser tracker is set up. Its technical parameters are as follows:

[0020] Maximum measurement radius: 350 meters; Single point measurement accuracy: ±0.05 mm; Angle measurement accuracy: 0.001°; Sampling frequency: 10 Hz; Environmental adaptability: Operating temperature 5-40℃, equipped with an air fluctuation compensation module.

[0021] In step 1, the laser tracker is set up within a 15-meter radius of the base center. A basic coordinate system is established using total station mode, and the earth's horizontal plane is collected as a flatness comparison benchmark. A 3×3 measurement grid is set on each base plate, with the spacing determined according to 1 / 4 of the plate length L. The laser tracker is then set up, and the measurement accuracy is set to 0.02 mm / m.

[0022] The nine points in step 2 include left, middle, and right horizontally, and front, middle, and back vertically.

[0023] Step 3 includes:

[0024] Step 31: Single Board Adjustment

[0025] When δ>0.05mm, the coordinates of the highest point are determined as the reference, and the adjustment amount of the shims at each point is calculated according to the formula Δhi=Zmax-Zi. 0.01mm stainless steel shims are used for graded adjustment.

[0026] Step 32: Overall adjustment: When Δ>0.1mm, establish a deviation matrix [Δx,Δy,Δz] 6×3;

[0027] The adjustment priority is calculated using the gradient descent method.

[0028] Priority = Σ|Δzi| × position weight coefficient;

[0029] Implement cross-adjustment: first adjust the plate with the largest negative deviation, then adjust the plate with the positive deviation.

[0030] In step 31, the coarse adjustment is at the 0.5mm level, and the fine adjustment is at the 0.1mm level.

[0031] The acceptance criteria in step 4 are: single board flatness ≤ 0.05mm, overall flatness ≤ 0.1mm, and height difference at the joint of adjacent boards ≤ 0.03mm.

[0032] The beneficial effects of this invention are: (1) proposing a three-level leveling process of "overall fitting-plate adjustment-dynamic compensation"; (2) developing a flatness evaluation method based on point cloud registration; and (3) innovatively adopting a real-time three-dimensional coordinate system leveling technology using a laser tracker. Attached Figure Description

[0033] Figure 1 This is a schematic diagram showing the layout of the base plate and the distribution of measurement points;

[0034] Figure 2 This is a block diagram of the laser tracker measurement system.

[0035] Figure 3 The flowchart illustrates a high-precision leveling method for a mounting base of a large nuclear power diesel engine based on a laser tracker, as provided by this invention. Detailed Implementation

[0036] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0037] Among existing laser tracker equipment, the FARO Vantage series laser tracker has a ranging accuracy of ±0.05mm and an angular resolution of 0.001°. Its dynamic measurement mode supports a data update frequency of 10Hz, making it particularly suitable for real-time precision measurement in large-scale spaces.

[0038] The part to be measured, such as Figure 1 As shown.

[0039] like Figure 3 As shown, a high-precision leveling method for a mounting base of a large nuclear power diesel engine includes the following steps:

[0040] (1) Establish a dual benchmark system:

[0041] Local reference: The "overall mounting plane" is fitted by laser measurement point cloud of 6 base plates;

[0042] Global reference: Establish a geodetic horizontal plane aligned with the equipment's base coordinate system.

[0043] (2) Layered leveling control:

[0044] Primary control: Single board flatness ≤ 0.05mm (measured using a 9-point grid, with the highest reference point determined by the three-point method);

[0045] Secondary control: The overall flatness after splicing is ≤0.1mm (based on least squares plane fitting).

[0046] (3) Intelligent adjustment strategy:

[0047] Single-board leveling adopts the "low-to-high approach method", and overall leveling adopts the "gradient compensation method". The laser tracker provides real-time feedback of three-dimensional coordinate data, and the adjustment amount is automatically calculated through the integration of dedicated analysis software (CAM2) and point cloud analysis module.

[0048] Specifically, a high-precision leveling method for the mounting base of a large nuclear power diesel engine includes the following steps:

[0049] Step 1: Measurement Preparation Stage

[0050] The technical parameters for setting up the FARO LaserTracker Vantage laser tracker are as follows:

[0051] Maximum measurement radius: 350 meters; Single-point measurement accuracy: ±0.05 mm; Angle measurement accuracy: 0.001°; Sampling frequency: 10 Hz.

[0052] Environmental adaptability: Operating temperature 5-40℃, equipped with an air fluctuation compensation module.

[0053] The equipment was installed within a 15-meter radius of the base center. A basic coordinate system was established using total station mode, and the geodetic level was collected as a flatness comparison benchmark. A 3×3 measurement grid was set on each base plate, with the spacing determined by 1 / 4 of the plate length L. A laser tracker was installed, and the measurement accuracy was set to 0.02 mm / m.

[0054] Step 2: Data Acquisition and Processing

[0055] Step 21: Single Board Measurement

[0056] Nine measurements were taken at each base plate (laterally divided into left, center, and right; longitudinally divided into front, center, and back). The plane equation of the single plate was calculated using the least squares method: Z = ax + by + c. The flatness calculation formula is: δ = Max(Z i )-Min(Z i (i=1~9).

[0057]

[0058] Step 22: Overall Fitting

[0059] The measurement data collected from the 6 base plates are unified into the basic coordinate system. After manually removing outliers, the overall plane is fitted. When the overall flatness deviation Δ is ≥0.15mm, the adjustment program is triggered.

[0060] Step 3: Adjust Implementation

[0061] Step 31: Single Board Adjustment

[0062] When δ > 0.05 mm, the coordinates of the highest point are determined as the reference, and the formula Δh is used. i =Z max -Z i Calculate the shim adjustment amount at each point, and use 0.01mm grade stainless steel shims for graded adjustment (0.5mm for coarse adjustment and 0.1mm for fine adjustment).

[0063]

[0064] The above operations are performed using the measurement software included with the FARO Vantage series laser tracker. These are inherent parameters or calculation methods.

[0065] Step 32: Overall adjustment: When Δ>0.1mm, establish the deviation matrix [Δx,Δy,Δz]6×3.

[0066] The adjustment priority is calculated using the gradient descent method.

[0067] Priority = Σ|Δz i |×Position weight coefficient (edge ​​plate weight coefficient is 1.2);

[0068] Implement cross-adjustment: first adjust the plate with the largest negative deviation, then adjust the plate with the positive deviation.

[0069] Step 4: Acceptance Criteria

[0070] Single board flatness ≤ 0.05mm, overall flatness ≤ 0.1mm, height difference at the joint of adjacent boards ≤ 0.03mm.

[0071] Compared with traditional methods, the method of the present invention has the following advantages:

[0072] Traditional methods have the following limitations: measurement accuracy: ±0.5mm; adjustment time per cycle: 6-8 hours; personnel dependence: senior technicians; environmental sensitivity: susceptible to vibration.

[0073] The method of this invention has the following characteristics: measurement accuracy: ±0.05mm; adjustment time per cycle: ≤1 hour; personnel dependence: ordinary operator; environmental sensitivity: built-in compensation system.

Claims

1. A large nuclear power diesel engine equipment installation base high-precision leveling method based on a laser tracker, characterized in that, It comprises the following steps: Step 1: measurement preparation stage; Step 2: data acquisition processing; The step 2 comprises: Step 21: single board measurement 9 points are measured on each base plate, and the single plate 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; Wherein, Z is the Z coordinate of the point, a, b are the slope of x, y direction respectively, c is the Z axis intercept, x, y are the X, Y coordinates of the point; Step 22: overall fitting 6 block bottom plate acquisition of measurement data to the base coordinate system, remove outliers after fitting overall plane, calculate overall flatness deviation Δ≥0.15mm when trigger adjustment program; Step 3: adjustment implementation; The step 3 comprises: Step 31: single board adjustment When δ > 0.05mm, the highest point coordinates are determined as the reference, and the formula Δh i = Z max - Z i The gasket adjustment amount of each point is calculated, and the 0.01mm level stainless steel gasket is used for step adjustment; Step 32: overall adjustment: when Δ>0.1mm, the bias matrix [Δx, Δy, Δz] 6×3 is established; The gradient descent method is used to calculate the adjustment priority: Priority = Σ|Δzi|× position weight coefficient; Cross adjustment is implemented: first adjust the largest negative deviation plate, then adjust the positive deviation plate; Step 4: establish acceptance criteria; The acceptance criteria in step 4 are single board flatness ≤0.05mm, overall flatness ≤0.1mm, and height difference at the joint between adjacent plates ≤0.03mm.

2. The method for high-precision leveling of a large nuclear power diesel engine equipment mounting base based on a laser tracker according to claim 1, characterized in that: The step 1 is to erect a FARO LaserTracker Vantage laser tracker, and 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: working temperature 5-40℃, equipped with air fluctuation compensation module.

3. The method for high-precision leveling of a large nuclear power diesel engine equipment mounting base based on a laser tracker according to claim 2, characterized in that: The step 1 is to erect a laser tracker in the center of the base within a radius of 15 meters, establish a base coordinate system through total station mode, collect ground level as flatness comparison reference, set 3×3 measurement grid on each bottom plate, interval is determined according to 1 / 4 of plate length L, erect laser tracker, measurement accuracy is set to 0.02mm / m.

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

5. The method for high-precision leveling of a large nuclear power diesel engine equipment mounting base based on a laser tracker according to claim 1, characterized in that: The step 31 is to adjust 0.5mm level for coarse adjustment and 0.1mm level for fine adjustment.

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