Nuclear fuel conveying pipeline center offset measuring device and offset calculating method

Abstract

The invention belongs to an offset measuring device and an offset calculating method, and particularly relates to a nuclear fuel conveying pipeline center offset measuring device and an offset calculating method. The device comprises a main ruler, a main ruler base, a digital display vernier, a depth ruler, an auxiliary ruler, an auxiliary ruler base, a fastening bolt, a fastening jackscrew and a locking gasket. The main ruler is connected and matched with the ruler body groove of the main ruler base through a bolt; the digital display vernier can slide on the scale guide rail of the main ruler through a limiting clamping groove of the digital display vernier; the digital display vernier can display a relative movement value of movement on the scale guide rail of the main ruler; the depth gauge is arranged in the guide groove of the main ruler and is fixed with the digital display vernier under the action of the fastening jackscrew and the locking gasket; the auxiliary ruler is connected and matched with the auxiliary ruler base ruler body groove through a bolt; and the main ruler base is matched and connected with the auxiliary ruler boss of the auxiliary ruler base through the main ruler groove. The device has the remarkable effects that constructors are assisted in adjusting the pipeline, so that the pipeline mounting precision is improved, and the engineering construction quality is guaranteed.

Description

Technical Field

[0001] The invention belongs to an offset measurement device and a calculation method, and in particular relates to a nuclear fuel delivery pipeline center offset measurement device and an offset calculation method. Background Art

[0002] In the nuclear industry, nuclear fuel is an important and indispensable part of the operation of nuclear reactors. In a nuclear reactor power station, the spent fuel in the nuclear reactor pressure vessel passes through the reactor moderator pool and the nuclear fuel transfer channel, and then is transferred to the spent fuel pool in the fuel plant for storage. Similarly, the new fuel is transferred to the reactor moderator pool through the nuclear fuel transfer channel in the new fuel plant, and then the new fuel is loaded into the nuclear reactor pressure vessel through the refueling machine. The reactor nuclear fuel transfer channel is an important device for nuclear fuel transfer. During the design and installation process, there are strict requirements on the overall elevation and horizontality of the device. The nuclear fuel delivery pipeline is the installation basis of the nuclear fuel transfer channel, and its installation offset directly affects the accuracy of the nuclear fuel transfer channel.

[0003] The fuel transfer channel runs through the reactor containment, with one end connected to the reactor pool and the other end connected to the fuel plant pool. In order to ensure the tightness of the reactor pool and the fuel plant pool, the fuel transfer channel is connected by welding. However, welding deformation is inevitable due to welding heat input during the welding process. Therefore, during the pipe section welding process, monitoring the center deviation of the pipeline caused by the stress generated by welding has become an indispensable task in pipeline welding construction.

[0004] The existing technology relies entirely on the operator's experience to estimate and monitor the pipeline center offset, which is neither accurate nor efficient. Therefore, a new objective method for determining the pipeline center offset is needed. Summary of the invention

[0005] Aiming at the defects of the prior art, the present invention provides a device for measuring the center offset of a nuclear fuel delivery pipeline and a method for calculating the offset.

[0006] The present invention is implemented as follows: a device for measuring the center offset of a nuclear fuel delivery pipeline, which includes a main scale, a main scale base, a digital display cursor, a depth gauge, a secondary scale, a secondary scale base, fastening bolts, fastening top screws, and locking washers; the main scale is connected and matched with the scale body groove of the main scale base through bolts; the digital display cursor can slide on the main scale scale guide rail through its own limit slot, and the digital display cursor can display the relative movement value on the main scale scale guide rail; the depth gauge is in the main scale guide groove and is fixed to the digital display cursor through the fastening top screw and the locking washers; the secondary scale is connected and matched with the scale body groove of the secondary scale base through bolts; the main scale base is connected and matched with the secondary scale boss of the secondary scale base through the main scale groove.

[0007] As described above, a nuclear fuel delivery pipeline center offset measuring device is provided, wherein two threaded holes are processed at the bottom of the ruler body groove on the main ruler base, and the main ruler passes through the ruler body groove on the main ruler base so that the bottom of the main ruler contacts with the ruler body groove of the main ruler base, and the two are fixed by fastening bolts.

[0008] A device for measuring the center offset of a nuclear fuel delivery pipeline as described above, wherein the digital display cursor can slide on the main scale scale guide rail through its own limit slot, the depth gauge is in the main scale guide groove, and is fixed to the digital display cursor by tightening the top screw and the locking gasket, and the digital display cursor and the depth gauge slide on the main scale scale guide rail, so that the depth gauge passes through the main scale base and contacts the inner wall of the nuclear fuel delivery pipeline.

[0009] As described above, a nuclear fuel delivery pipeline center offset measuring device, wherein two threaded holes are processed at the bottom of the ruler body groove on the secondary ruler base, and the secondary ruler passes through the ruler body groove on the secondary ruler base so that the bottom of the secondary ruler contacts with the ruler body groove of the secondary ruler base, and the two are fixed by bolts.

[0010] A method for calculating the center offset of a nuclear fuel delivery pipeline comprises the following steps:

[0011] Step 1: Place the main scale of the device in the fuel delivery pipeline, so that the arc of the main scale base is close to the inner wall of the fuel delivery pipeline; install the secondary scale, so that the convex groove of the secondary scale passes through the groove of the main scale and the arc of the secondary scale base is close to the inner hole wall of the fuel delivery pipeline; at this time, the main scale body and the secondary scale body intersect to generate the intersection point of the inner diameter of the cross section of the fuel delivery pipeline, and the intersection point is the center of the cross section of the fuel delivery pipeline δ;

[0012] Step 2: Push the digital display cursor so that the vertex of the digital display cursor reaches the intersection of the main scale body and the auxiliary scale body, and record the value λ1 of the digital display cursor at this time;

[0013] Step 3: Push the digital display cursor so that the bottom of the depth gauge rod installed on the digital display cursor contacts the inner hole wall of the fuel delivery pipeline, and record the value λ2 of the digital display cursor at this time;

[0014] Step 4: Calculate the inner hole radius of the fuel delivery pipeline Rh = λ1-λ2+λh, where λh is the distance from the top of the digital display cursor to the bottom of the depth ruler on the digital display cursor, which is a standard value;

[0015] Step 5: Rotate the device 90° and repeat steps 2 to 5 for measurement and calculation, repeat four times; measure the inner hole radii Rh1, Rh2, Rh3, and Rh4 respectively; the radius of the corrected section R = (Rh1+Rh2+Rh3+Rh4) / 4;

[0016] Step 6: Repeat steps 2 to 5 to measure the radii R1, R2, R3, ..., Rn of multiple pipe sections respectively. The maximum radius Rmax - the minimum radius Rmin of all measured sections R1, R2, R3, ..., Rn is the radius error δ of the nuclear fuel delivery pipeline;

[0017] Step 7: Place the main ruler of the device in the fuel delivery pipeline, so that the arc of the main ruler base is close to the inner wall of the fuel delivery pipeline; install the secondary ruler, so that the convex groove of the secondary ruler passes through the groove of the main ruler and the arc of the secondary ruler base is close to the inner hole wall of the fuel delivery pipeline; at this time, the main ruler body and the secondary ruler body intersect to generate the intersection of the inner diameter of the cross section of the fuel delivery pipeline, and the intersection is the center δ of the cross section of the left end of the fuel delivery pipeline; set up a total station, and measure the coordinate value (Xo, Yo) of the center δ in the plant by the total station;

[0018] Step 8: Repeat step 7 to measure the coordinate values ​​(Xo1, Yo1), (Xo2, Yo2), (Xo3, Yo3), ... (Xon, Yon) of the center points δ1, δ2, δ3 ... δn of multiple pipe cross sections respectively;

[0019] Step 9: Take the maximum X value Xmax and the minimum X value Xmin of (Xo1, Yo1), (Xo2, Yo2), (Xo3, Yo3), ... (Xon, Yon), and take the maximum Y value Ymax and the minimum Y value Ymin of (Xo1, Yo1), (Xo2, Yo2), (Xo3, Yo3), ... (Xon, Yon);

[0020] Step 10: Calculate the axial centerline error of the fuel delivery pipeline σx=Xmax-Xmin, σy=Ymax-Ymin.

[0021] The method for calculating the center offset of a nuclear fuel delivery pipeline as described above, wherein the following steps are performed after step 10:

[0022] Fuel delivery pipeline deviation measurement and calculation:

[0023] Step 11: According to the drawings and actual measurements, the length of the fuel delivery pipeline is z;

[0024] Step 12: Install the center offset measurement device to the head end of the fuel delivery pipeline, and install the total station to measure the coordinate value of the center δ1 (x1, y1) of the head end section;

[0025] Step 13: Install the center offset measurement device to the end of the fuel delivery pipeline, and install the total station to measure the coordinate value of the center δ2 (x2, y2) of the end section;

[0026] Step 14: After the fuel pipeline is installed and constructed, repeat steps 12 and 13 to obtain the coordinate values ​​of the center of the first end δ3 (x3, y3) and the center of the last end δ4 (x4, y4) respectively;

[0027] Step 15: Calculate the offset of the fuel delivery pipeline in the X and Y directions

[0028] Axis δ1δ2 and axis δ3δ4 have three situations in the vertical direction y: angle, displacement, or angle and displacement coexist. The y-direction angle deviation α 1 , y-direction displacement deviation t 1 .

[0029] The significant effect of the present invention is: the device is used to measure the center offset of the fuel transfer channel pipeline, and the descriptive geometry principle combined with the trigonometric function principle is used to calculate the center deviation of the pipeline caused by welding heat input during pipeline welding, thereby assisting construction personnel to adjust the pipeline to improve the pipeline installation accuracy and ensure the quality of engineering construction.

[0030] Specifically, the center offset measuring device of the nuclear fuel delivery pipeline can determine the actual position of the center of the pipeline cross section when in use. The device can move in the pipeline and obtain multiple center coordinate values ​​with the help of a total station. Multiple points are connected into a line, which is the pipeline axis. By measuring the axis of the pipeline before and after welding, the axis deviation of the pipeline before and after welding can be obtained, including: angle deviation, displacement deviation and angle displacement deviation. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a schematic diagram of the use of the nuclear fuel delivery pipeline center offset measurement device of the present application;

[0032] Figure 2a It is a schematic diagram of the structure of the device for measuring the center offset of a nuclear fuel delivery pipeline of the present application;

[0033] Figure 2b It is a schematic diagram of the structure of the nuclear fuel delivery pipeline center offset measuring device of the present application placed in the pipeline;

[0034] Figure 3a y3-y1=0, y4-y2>0, there is an angle deviation α in the y direction 1 Schematic diagram of

[0035] Figure 3b If y3-y1=0, y4-y2<0, there is an angle deviation α in the y direction. 1 Schematic diagram of

[0036] Figure 4a If y3-y1<0, y4-y2=0, there is an angle deviation α in the y direction. 1 Schematic diagram of

[0037] Figure 4b If y3-y1<0, y4-y2=0, there is an angle deviation α in the y direction. 1 Schematic diagram of

[0038] Figure 5a y3-y1<0, y4-y2>0 and |y3-y1|<|y4-y2| has an angle deviation α in the y direction 1 Schematic diagram of

[0039] Figure 5b y3-y1<0, y4-y2>0 and |y3-y1|>|y4-y2| has an angle deviation α in the y direction 1 Schematic diagram of

[0040] Figure 5c y3-y1>0, y4-y2<0 and |y3-y1|>|y4-y2| has an angle deviation α in the y direction 1 Schematic diagram of

[0041] Figure 5d y3-y1>0, y4-y2<0 and |y3-y1|<|y4-y2| has an angle deviation α in the y direction 1 Schematic diagram of

[0042] Figure 6a y3-y1>0, y4-y2>0 and |y3-y1|=|y4-y2|, there is a y-direction displacement deviation t 1 Schematic diagram of

[0043] Figure 6b y3-y1<0, y4-y2<0 and |y3-y1|=|y4-y2|, there is a y-direction displacement deviation t 1 Schematic diagram of

[0044] Figure 7a y3-y1>0, y4-y2>0 and |y3-y1|<|y4-y2| has a y-direction displacement deviation t 1 and y-angle deviation α 1 Schematic diagram of

[0045] Figure 7b y3-y1<0, y4-y2<0 and |y3-y1|<|y4-y2| has a y-direction displacement deviation t 1 and y-angle deviation α 1 Schematic diagram of

[0046] Figure 8a y3-y1>0, y4-y2>0 and |y3-y1|>|y4-y2| has a y-direction displacement deviation t 1and y-angle deviation α 1 Schematic diagram of

[0047] Figure 8b y3-y1<0, y4-y2<0 and |y3-y1|>|y4-y2| has a y-direction displacement deviation t 1 and y-angle deviation α 1 Schematic diagram of

[0048] Figure 9a x3-x1=0, x4-x2>0, there is an angle deviation α in the x direction 2 Schematic diagram of

[0049] Figure 9b x3-x1=0, x4-x2<0, there is an angle deviation α in the x direction 2 Schematic diagram of

[0050] Fig.10a x3-x1>0, x4-x2=0, there is an angle deviation α in the x direction 2 Schematic diagram of

[0051] Fig.10b x3-x1<0, x4-x2=0, there is an angle deviation α in the x direction 2 Schematic diagram of

[0052] Fig.11a x3-x1<0, x4-x2>0 and |x3-x1|<|x4-x2| has an angle deviation α in the x direction 2 Schematic diagram of

[0053] Fig.11b x3-x1<0, x4-x2>0 and |x3-x1|>|x4-x2| has an x-direction angle deviation α 2 Schematic diagram of

[0054] Fig.11c x3-x1>0, x4-x2<0 and |x3-x1|>|x4-x2| has an x-direction angle deviation α 2 Schematic diagram of

[0055] Fig.11d x3-x1>0, x4-x2<0 and |x3-x1|<|x4-x2| has an angle deviation α in the x direction 2 Schematic diagram of

[0056] Fig.12a x3-x1<0, x4-x2<0 and |x3-x1|=|x4-x2|, there is an x-direction displacement deviation t 2 Schematic diagram of

[0057] Figure 12bx3-x1>0, x4-x2>0 and |x3-x1|=|x4-x2|, there is an x-direction displacement deviation t 2 Schematic diagram of

[0058] Fig.13a x3-x1>0, x4-x2>0 and |x3-x1|<|x4-x2| has an x-direction displacement deviation t 2 and the x-axis angle deviation α 2 Schematic diagram of

[0059] Fig.13b x3-x1<0, x4-x2<0 and |x3-x1|<|x4-x2| has an x-direction displacement deviation t 2 and the x-axis angle deviation α 2 Schematic diagram of

[0060] Fig.14a x3-x1>0, x4-x2>0 and |x3-x1|>|x4-x2| has an x-direction displacement deviation t 2 and the x-axis angle deviation α 2 Schematic diagram of

[0061] Fig.14b x3-x1<0, x4-x2<0 and |x3-x1|>|x4-x2| has an x-direction displacement deviation t 2 and the x-axis angle deviation α 2 Schematic diagram of

[0062] In the figure: 1. Main ruler, 2. Main ruler base, 3. Digital display vernier, 4. Depth gauge, 5. Auxiliary ruler, 6. Auxiliary ruler base, 7. Fastening bolts, 8. Fastening top screws, 9. Locking gasket. DETAILED DESCRIPTION

[0063] A device for measuring the center offset of a nuclear fuel delivery pipeline comprises: a main scale 1, a main scale base 2, a digital display cursor 3, a depth gauge 4, a secondary scale 5, a secondary scale base 6, a fastening bolt 7, a fastening top screw 8, and a locking gasket 9; the device is characterized in that: the main scale 1 is connected and matched with the scale body groove of the main scale base 2 by bolts; the digital display cursor 3 can slide on the scale guide rail of the main scale 1 through its own limit card slot, and the digital display cursor 3 can display the relative movement value moved on the scale guide rail of the main scale 1; the depth gauge 4 is in the guide groove of the main scale 1, and is fixed to the digital display cursor 3 through the fastening top screw 8 and the locking gasket 9; the secondary scale 5 is connected and matched with the scale body groove of the secondary scale base 6 by bolts; the main scale base 2 is connected with the secondary scale base 6 through the main scale groove and the secondary scale boss.

[0064] Two threaded holes are processed at the bottom of the ruler body groove on the main ruler base 2. The main ruler 1 passes through the ruler body groove on the main ruler base 2 so that the bottom of the main ruler 1 contacts the ruler body groove of the main ruler base 2, and the two are fixed together by fastening bolts 7.

[0065] The digital display cursor 3 can slide on the scale guide rail of the main scale 1 through its own limit slot. The depth gauge 4 is in the guide groove of the main scale 1 and is fixed to the digital display cursor 3 by tightening the top screw 8 and the locking gasket 9. The digital display cursor 3 and the depth gauge 4 slide on the scale guide rail of the main scale 1, so that the depth gauge 4 passes through the main scale base 2 and contacts the inner wall of the nuclear fuel delivery pipeline.

[0066] The bottom of the ruler body groove on the secondary ruler base 6 is processed with two threaded holes, and the secondary ruler 5 passes through the ruler body groove on the secondary ruler base 6 so that the bottom of the secondary ruler 5 contacts the ruler body groove of the secondary ruler base 6, and the two are fixed by bolts.

[0067] As another aspect of the present invention, the present invention also proposes a method for measuring and calculating the center offset of a nuclear fuel delivery pipeline, and the method comprises the following steps:

[0068] Measurement and calculation of geometric errors of fuel delivery pipelines:

[0069] Step 1: Place the main scale of the device in the fuel delivery pipeline, so that the arc of the main scale base is close to the inner wall of the fuel delivery pipeline; install the secondary scale, so that the convex groove of the secondary scale passes through the groove of the main scale and the arc of the secondary scale base is close to the inner hole wall of the fuel delivery pipeline; at this time, the main scale body and the secondary scale body intersect to generate the intersection point of the inner diameter of the cross section of the fuel delivery pipeline, and the intersection point is the center of the cross section of the fuel delivery pipeline δ;

[0070] Step 2: Push the digital display cursor so that the vertex of the digital display cursor reaches the intersection of the main scale body and the auxiliary scale body, and record the value λ1 of the digital display cursor at this time;

[0071] Step 3: Push the digital display cursor so that the bottom of the depth gauge rod installed on the digital display cursor contacts the inner hole wall of the fuel delivery pipeline, and record the value λ2 of the digital display cursor at this time;

[0072] Step 4: Calculate the inner hole radius of the fuel delivery pipeline Rh = λ1-λ2+λh, where λh is the distance from the top of the digital display cursor to the bottom of the depth ruler on the digital display cursor, which is a standard value;

[0073] Step 5: Rotate the device 90° and repeat steps 2 to 5 for measurement and calculation, repeat four times; measure the inner hole radii Rh1, Rh2, Rh3, and Rh4 respectively; the radius of the corrected section R = (Rh1+Rh2+Rh3+Rh4) / 4;

[0074] Step 6: Repeat steps 2 to 5 to measure the radii R1, R2, R3, ..., Rn of multiple pipe sections respectively. The maximum radius Rmax - the minimum radius Rmin of all measured sections R1, R2, R3, ..., Rn is the radius error δ of the nuclear fuel delivery pipeline;

[0075] Step 7: Place the main ruler of the device in the fuel delivery pipeline, so that the arc of the main ruler base is close to the inner wall of the fuel delivery pipeline; install the secondary ruler, so that the convex groove of the secondary ruler passes through the groove of the main ruler and the arc of the secondary ruler base is close to the inner hole wall of the fuel delivery pipeline; at this time, the main ruler body and the secondary ruler body intersect to generate the intersection of the inner diameter of the cross section of the fuel delivery pipeline, and the intersection is the center δ of the cross section of the left end of the fuel delivery pipeline; set up a total station, and measure the coordinate value (Xo, Yo) of the center δ in the plant by the total station;

[0076] Step 8: Repeat step 7 to measure the coordinate values ​​(Xo1, Yo1), (Xo2, Yo2), (Xo3, Yo3), ... (Xon, Yon) of the center points δ1, δ2, δ3 ... δn of multiple pipe cross sections respectively;

[0077] Step 9: Take the maximum X value Xmax and the minimum X value Xmin of (Xo1, Yo1), (Xo2, Yo2), (Xo3, Yo3), ... (Xon, Yon), and take the maximum Y value Ymax and the minimum Y value Ymin of (Xo1, Yo1), (Xo2, Yo2), (Xo3, Yo3), ... (Xon, Yon);

[0078] Step 10: Calculate the axial centerline error of the fuel delivery pipeline σx=Xmax-Xmin, σy=Ymax-Ymin.

[0079] Fuel delivery pipeline deviation measurement and calculation:

[0080] Step 11: According to the drawings and actual measurements, the length of the fuel delivery pipeline is z;

[0081] Step 12: Install the center offset measurement device to the head end of the fuel delivery pipeline, and install the total station to measure the coordinate value of the center δ1 (x1, y1) of the head end section;

[0082] Step 13: Install the center offset measurement device to the end of the fuel delivery pipeline, and install the total station to measure the coordinate value of the center δ2 (x2, y2) of the end section;

[0083] Step 14: After the fuel pipeline is installed and constructed, repeat steps 12 and 13 to obtain the coordinate values ​​of the center of the first end δ3 (x3, y3) and the center of the last end δ4 (x4, y4) respectively;

[0084] Step 15: Calculate the offset of the fuel delivery pipeline in the X and Y directions

[0085] There are three situations in which the axis δ1δ2 and the axis δ3δ4 have an angle, a displacement, or a coexistence of an angle and a displacement in the vertical direction y. 1 , y-direction displacement deviation t 1 .

[0086] The first case: there is an angle in the vertical y direction

[0087] If y3-y1=0, y4-y2>0, then there is an angle

[0088] If y3-y1=0, y4-y2<0, then there is an angle

[0089] If y3-y1<0, y4-y2=0, then there is an angle

[0090] If y3-y1<0, y4-y2=0, then there is an angle

[0091] If y3-y1<0, y4-y2>0 and |y3-y1|<|y4-y2| then there is an angle

[0092] If y3-y1<0, y4-y2>0 and |y3-y1|>|y4-y2| then there is an angle

[0093] If y3-y1>0, y4-y2<0 and |y3-y1|>|y4-y2| then there is an angle

[0094] If y3-y1>0, y4-y2<0 and |y3-y1|<|y4-y2| then there is an angle

[0095]

[0096] The second case: there is displacement in the vertical y direction

[0097] If y3-y1>0, y4-y2>0 and |y3-y1|=|y4-y2|, then there is a displacement

[0098] If y3-y1<0, y4-y2<0 and |y3-y1|=|y4-y2|, then there is a displacement

[0099] t 1 =|y3-y1|=|y4-y2|

[0100] The third case: the y-direction angle and displacement coexist in the vertical direction

[0101] If y3-y1>0, y4-y2>0 and |y3-y1|<|y4-y2|, then the angle and displacement coexist.

[0102] If y3-y1<0, y4-y2<0 and |y3-y1|<|y4-y2|, then the angle and displacement coexist.

[0103]

[0104] t 1 =|y3-y1|

[0105] If y3-y1>0, y4-y2>0 and |y3-y1|>|y4-y2|, then the angle and displacement coexist.

[0106] If y3-y1<0, y4-y2<0 and |y3-y1|>|y4-y2|, then there exists coexistence of angle and displacement

[0107]

[0108] t 1 =|y4-y2|

[0109] There are three situations in which the axis δ1δ2 and the axis δ3δ4 exist in the horizontal x direction, there is an angle, a displacement, or a coexistence of an angle and a displacement. 2 .

[0110] The first case: there is an angle in the horizontal x direction

[0111] If x3-x1=0, x4-x2>0, then there is an angle

[0112] If x3-x1=0, x4-x2<0, then there is an angle

[0113]

[0114] If x3-x1>0, x4-x2=0, then there is an angle

[0115] If x3-x1<0, x4-x2=0, then there is an angle

[0116]

[0117] If x3-x1<0, x4-x2>0 and |x3-x1|<|x4-x2| then there is an angle

[0118] If x3-x1<0, x4-x2>0 and |x3-x1|>|x4-x2| then there is an angle

[0119] If x3-x1>0, x4-x2<0 and |x3-x1|>|x4-x2| then there is an angle

[0120] If x3-x1>0, x4-x2<0 and |x3-x1|<|x4-x2| then there is an angle

[0121]

[0122] The second case: there is displacement in the horizontal x direction

[0123] If x3-x1<0, x4-x2<0 and |x3-x1|=|x4-x2| then there is a displacement

[0124] If x3-x1>0, x4-x2>0 and |x3-x1|=|x4-x2| then there is a displacement

[0125] t 2 =|x3-x1|=|x4-x2|

[0126] The third case: the x-direction angle and displacement coexist in the horizontal direction

[0127] If x3-x1>0, x4-x2>0 and |x3-x1|<|x4-x2|, then the angle and displacement coexist.

[0128] If x3-x1<0, x4-x2<0 and |x3-x1|<|x4-x2|, then there exists coexistence of angle and displacement

[0129]

[0130] t 2 =|x3-x1|

[0131] If x3-x1>0, x4-x2>0 and |x3-x1|>|x4-x2|, then the angle and displacement coexist.

[0132] If x3-x1<0, x4-x2<0 and |x3-x1|>|x4-x2|, then there exists coexistence of angle and displacement

[0133]

[0134] t 2 =|x4-x2|

[0135] A practical example is given below.

[0136] 1. Radius deviation measurement

[0137] Take the nuclear fuel delivery pipeline with a diameter of 520 as an example, the actual radius of the inner wall of the pipeline is 260. First, select the 350 main scale body, 350 secondary scale body and 200 depth gauge suitable for the diameter according to the inner diameter of the pipeline, install the main scale body and secondary scale body on the scale body groove of the main scale base and the scale body groove of the secondary scale base respectively, and install the 200 depth gauge in the guide groove of the main scale body.

[0138] First, place the main scale of the device as a whole in the nozzle of the fuel delivery pipeline, so that the arcs at both ends of the main scale base are tangent to the pipe wall; install the auxiliary scale as a whole, so that the auxiliary scale boss is embedded in the main scale groove, and the arcs at both ends of the auxiliary scale base are tangent to the pipe wall; the main scale body and the auxiliary scale body intersect, and the intersection point is the center of the cross section of the pipeline nozzle δ1;

[0139] Push the digital display cursor so that the vertex of the digital display cursor reaches the intersection of the main scale body and the auxiliary scale body, and record the digital display cursor value of 207 at this time. Push the digital display cursor so that the depth ruler rod installed on the digital display cursor contacts the inner hole wall of the pipe orifice, and record the digital display cursor value of 144 at this time.

[0140] Calculate the inner hole radius of the fuel delivery pipeline Rh1 = λ1-λ2+λh = 207-144+200 = 263

[0141] Rotate the device 90° and repeat the measurement and calculation four times; measure the inner hole radii Rh1, Rh2, Rh3, and Rh4 respectively;

[0142] Rh2=λ1-λ2+λh=201-141+200=260

[0143] Rh3=λ1-λ2+λh=209-145+200=264

[0144] Rh4=λ1-λ2+λh=203-142+200=261

[0145] Correct the radius error of the cross section: R1 = (Rh1 + Rh2 + Rh3 + Rh4) / 4 = (263 + 260 + 264 + 261) / 4 = 262.

[0146] 2. Axis deviation measurement

[0147] Taking the nuclear fuel delivery pipeline with a diameter of 520 as an example, it has a fixed position on the design drawing, namely the theoretical axis. Similarly, according to the inner diameter of the pipeline, a 350 main scale body, a 350 secondary scale body and a 200 depth gauge suitable for the diameter are selected. The main scale body and the secondary scale body are respectively installed on the scale body groove of the main scale base and the scale body groove of the secondary scale base, and the 200 depth gauge is installed in the guide groove of the main scale body.

[0148] Place the main scale of the device as a whole in the nozzle of the nuclear fuel delivery pipeline, so that the arcs at both ends of the main scale base are tangent to the nozzle wall of the nuclear fuel delivery pipeline; install the auxiliary scale as a whole, so that the auxiliary scale boss is embedded in the main scale groove, and the arcs at both ends of the auxiliary scale base are tangent to the nozzle wall of the welded pipeline; the main scale body intersects with the auxiliary scale body, rotate the device 90° and repeat the measurement and calculation, repeat four times, and obtain the radius of the corrected section. The intersection point is the center δ1 of the nozzle section of the nuclear fuel delivery pipeline. Set up a total station, and use the total station to measure the coordinate value of the center δ1 in the plant.

[0149] Further, the main scale of the device is moved 3000mm to the other end in the nuclear fuel delivery pipeline, so that the arcs at both ends of the main scale base are tangent to the pipe wall of the pipe mouth; the auxiliary scale is installed as a whole, so that the auxiliary scale boss is embedded in the main scale groove, and the arcs at both ends of the auxiliary scale base are tangent to the pipe wall of the pipe mouth; the main scale body and the auxiliary scale body intersect, and the device is rotated 90° to repeat the measurement and calculation, and repeated four times to obtain the radius of the corrected section. The intersection is the center δ2 of the nuclear fuel delivery pipeline pipe mouth section. Set up a total station, and use the total station to measure the coordinate value of the center δ2 in the plant. After the construction activities, the left end section and the right end section are measured by the device to obtain the center δ3 and the center δ4 respectively.

[0150] There are three situations in which the axis δ1δ2 and the axis δ3δ4 exist in the horizontal x direction, such as angle, displacement, or both angle and displacement. 1 , x-direction displacement deviation t 1 , y-direction angle deviation α2, y-direction displacement deviation t 2 The axis deviation value is calculated according to the above formula.

Claims

1. A device for measuring the center deviation of a nuclear fuel delivery pipeline, characterized in that: The invention comprises a main ruler (1), a main ruler base (2), a digital display cursor (3), a depth gauge (4), a secondary ruler (5), a secondary ruler base (6), a fastening bolt (7), a fastening top screw (8), and a locking gasket (9); the main ruler (1) is connected and matched with the ruler body groove of the main ruler base (2) by bolt connection; the digital display cursor (3) can slide on the scale guide rail of the main ruler (1) through its own limit slot, and the digital display cursor (3) can display the relative movement value on the scale guide rail of the main ruler (1); the depth gauge (4) is in the guide groove of the main ruler (1) and is fixed to the digital display cursor (3) by the action of the fastening top screw (8) and the locking gasket (9); the secondary ruler (5) is connected and matched with the ruler body groove of the secondary ruler base (6) by bolt connection; the main ruler base (2) is connected and matched with the secondary ruler boss of the secondary ruler base (6) through the main ruler groove.

2. A nuclear fuel delivery pipeline center offset measuring device as claimed in claim 1, characterized in that: The bottom of the ruler body groove on the main ruler base (2) is processed with two threaded holes, and the main ruler (1) passes through the ruler body groove on the main ruler base (2), so that the bottom of the main ruler (1) contacts the ruler body groove of the main ruler base (2), and the two are fixed together by fastening bolts (7).

3. A device for measuring the center deviation of a nuclear fuel delivery pipeline as claimed in claim 2, characterized in that: The digital display cursor (3) can slide on the scale guide rail of the main scale (1) through its own limit slot, and the depth gauge (4) is fixed to the digital display cursor (3) in the guide groove of the main scale (1) through the action of a tightening top screw (8) and a locking gasket (9). The digital display cursor (3) and the depth gauge (4) slide on the scale guide rail of the main scale (1), so that the depth gauge (4) passes through the main scale base (2) and contacts the inner wall of the nuclear fuel delivery pipeline.

4. A device for measuring the center deviation of a nuclear fuel delivery pipeline as claimed in claim 3, characterized in that: The bottom of the ruler body groove on the auxiliary ruler base (6) is processed with two threaded holes, and the auxiliary ruler (5) passes through the ruler body groove on the auxiliary ruler base (6) so that the bottom of the auxiliary ruler (5) contacts the ruler body groove of the auxiliary ruler base (6), and the two are fixed by bolts.

5. A method for calculating the center offset of a nuclear fuel delivery pipeline, characterized in that: The steps include: Step 1: Place the main scale of the device in the fuel delivery pipeline, so that the arc of the main scale base is close to the inner wall of the fuel delivery pipeline; install the secondary scale, so that the convex groove of the secondary scale passes through the groove of the main scale and the arc of the secondary scale base is close to the inner hole wall of the fuel delivery pipeline; at this time, the main scale body and the secondary scale body intersect to generate the intersection point of the inner diameter of the cross section of the fuel delivery pipeline, and the intersection point is the center of the cross section of the fuel delivery pipeline δ; Step 2: Push the digital display cursor so that the vertex of the digital display cursor reaches the intersection of the main scale body and the auxiliary scale body, and record the value λ1 of the digital display cursor at this time; Step 3: Push the digital display cursor so that the bottom of the depth gauge rod installed on the digital display cursor contacts the inner hole wall of the fuel delivery pipeline, and record the value λ2 of the digital display cursor at this time; Step 4: Calculate the inner hole radius of the fuel delivery pipeline Rh = λ1-λ2+λh, where λh is the distance from the top of the digital display cursor to the bottom of the depth ruler on the digital display cursor, which is a standard value; Step 5: Rotate the device 90° and repeat steps 2 to 5 for measurement and calculation, repeat four times; measure the inner hole radii Rh1, Rh2, Rh3, and Rh4 respectively; the radius of the corrected section R = (Rh1+Rh2+Rh3+Rh4) / 4; Step 6: Repeat steps 2 to 5 to measure the radii R1, R2, R3, ..., Rn of multiple pipe sections respectively. The maximum radius Rmax - the minimum radius Rmin of all measured sections R1, R2, R3, ..., Rn is the radius error δ of the nuclear fuel delivery pipeline; Step 7: Place the main ruler of the device in the fuel delivery pipeline, so that the arc of the main ruler base is close to the inner wall of the fuel delivery pipeline; install the secondary ruler, so that the convex groove of the secondary ruler passes through the groove of the main ruler and the arc of the secondary ruler base is close to the inner hole wall of the fuel delivery pipeline; at this time, the main ruler body and the secondary ruler body intersect to generate the intersection of the inner diameter of the cross section of the fuel delivery pipeline, and the intersection is the center δ of the cross section of the left end of the fuel delivery pipeline; set up a total station, and measure the coordinate value (Xo, Yo) of the center δ in the plant by the total station; Step 8: Repeat step 7 to measure the coordinate values ​​(Xo1, Yo1), (Xo2, Yo2), (Xo3, Yo3), ... (Xon, Yon) of the center points δ1, δ2, δ3 ... δn of multiple pipe cross sections respectively; Step 9: Take the maximum X value Xmax and the minimum X value Xmin of (Xo1, Yo1), (Xo2, Yo2), (Xo3, Yo3), ... (Xon, Yon), and take the maximum Y value Ymax and the minimum Y value Ymin of (Xo1, Yo1), (Xo2, Yo2), (Xo3, Yo3), ... (Xon, Yon); Step 10: Calculate the axial centerline error of the fuel delivery pipeline σx=Xmax-Xmin, σy=Ymax-Ymin.

6. A method for calculating the center offset of a nuclear fuel delivery pipeline as claimed in claim 5, characterized in that: After step 10, perform the following steps: Fuel delivery pipeline deviation measurement and calculation: Step 11: According to the drawings and actual measurements, the length of the fuel delivery pipeline is z; Step 12: Install the center offset measurement device to the head end of the fuel delivery pipeline, and install the total station to measure the coordinate value of the center δ1 (x1, y1) of the head end section; Step 13: Install the center offset measurement device to the end of the fuel delivery pipeline, and install the total station to measure the coordinate value of the center δ2 (x2, y2) of the end section; Step 14: After the fuel pipeline is installed and constructed, repeat steps 12 and 13 to obtain the coordinate values ​​of the center of the first end δ3 (x3, y3) and the center of the last end δ4 (x4, y4) respectively; Step 15: Calculate the offset of the fuel delivery pipeline in the X and Y directions There are three situations between the axis δ1δ2 and the axis δ3δ4 in the vertical direction y, namely, an angle, a displacement, or a coexistence of an angle and a displacement, and the y-direction angle deviation is α1 and the y-direction displacement deviation is t1.

7. A method for calculating the center offset of a nuclear fuel delivery pipeline as claimed in claim 6, characterized in that: The three situations in the X direction of step 15 are: The first case: there is an angle in the horizontal x direction If x3-x1=0, x4-x2>0, then there is an angle If x3-x1=0, x4-x2<0, then there is an angle If x3-x1>0, x4-x2=0, then there is an angle If x3-x1<0, x4-x2=0, then there is an angle If x3-x1<0, x4-x2>0 and |x3-x1|<|x4-x2| then there is an angle If x3-x1<0, x4-x2>0 and |x3-x1|>|x4-x2| then there is an angle If x3-x1>0, x4-x2<0 and |x3-x1|>|x4-x2| then there is an angle If x3-x1>0, x4-x2<0 and |x3-x1|<|x4-x2| then there is an angle The second case: there is displacement in the horizontal x direction If x3-x1<0, x4-x2<0 and |x3-x1|=|x4-x2| then there is a displacement If x3-x1>0, x4-x2>0 and |x3-x1|=|x4-x2| then there is a displacement t2=|x3-x1|=|x4-x2| The third case: the x-direction angle and displacement coexist in the horizontal direction If x3-x1>0, x4-x2>0 and |x3-x1|<|x4-x2|, then the angle and displacement coexist. If x3-x1<0, x4-x2<0 and |x3-x1|<|x4-x2|, then there exists coexistence of angle and displacement t2=|x3-x1| If x3-x1>0, x4-x2>0 and |x3-x1|>|x4-x2|, then the angle and displacement coexist. If x3-x1<0, x4-x2<0 and |x3-x1|>|x4-x2|, then there exists coexistence of angle and displacement t2=|x4-x2| The three situations in the Y direction of step 15 are: The first case: there is an angle in the vertical y direction If y3-y1=0, y4-y2>0, then there is an angle If y3-y1=0, y4-y2<0, then there is an angle If y3-y1<0, y4-y2=0, then there is an angle If y3-y1<0, y4-y2=0, then there is an angle If y3-y1<0, y4-y2>0 and |y3-y1|<|y4-y2| then there is an angle If y3-y1<0, y4-y2>0 and |y3-y1|>|y4-y2| then there is an angle If y3-y1>0, y4-y2<0 and |y3-y1|>|y4-y2| then there is an angle If y3-y1>0, y4-y2<0 and |y3-y1|<|y4-y2| then there is an angle The second case: there is displacement in the vertical y direction If y3-y1>0, y4-y2>0 and |y3-y1|=|y4-y2|, then there is a displacement If y3-y1<0, y4-y2<0 and |y3-y1|=|y4-y2|, then there is a displacement t1=|y3-y1|=|y4-y2| The third case: the y-direction angle and displacement coexist in the vertical direction If y3-y1>0, y4-y2>0 and |y3-y1|<|y4-y2|, then the angle and displacement coexist. If y3-y1<0, y4-y2<0 and |y3-y1|<|y4-y2|, then the angle and displacement coexist. t1=|y3-y1| If y3-y1>0, y4-y2>0 and |y3-y1|>|y4-y2|, then the angle and displacement coexist. If y3-y1<0, y4-y2<0 and |y3-y1|>|y4-y2|, then there exists coexistence of angle and displacement t1=|y4-y2|.

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