Tube sheet hole location and perpendicularity measurement aid and method

Abstract

This invention discloses an auxiliary device and method for measuring the position and perpendicularity of tube sheet holes. In this device, by setting an insertable measuring fixture of appropriate size, the target ball can be fixed in the most suitable position. The center position of the target ball can be directly measured to obtain the center position of the tube sheet hole. This not only improves work efficiency, but also reduces adverse factors such as measurement error and target ball placement deviation, thus greatly improving the efficiency and accuracy of tube sheet hole measurement.

Description

TECHNICAL FIELD

[0001] The application relates to an auxiliary device and a measuring method for tube plate hole related size measurement, in particular to an auxiliary device and a method for measuring the position degree and the perpendicularity of a tube plate hole. BACKGROUND

[0002] A tube plate assembly is an important component of a steam generator; due to its characteristics, holes need to be drilled on the tube plate plane, and the holes have high position degree and perpendicularity requirements, the existing technology has high complexity in measurement and low accuracy, and the personnel skill for placing a target ball is required to be high, which is inconvenient, an opening is also provided on a circular ring of a steam generator feedwater ring, and the measurement of the opening is also based on the placement accuracy of the target ball, which is inconvenient.

[0003] For the position degree of the tube plate hole and the opening of the feedwater ring, the existing method is to place a target seat into the hole and take one point above and below and left and right of the hole to fit a circle center, and the circle center is the center of the tube plate hole.

[0004] Firstly, the method needs to collect 4 points for one hole, which greatly wastes time, in addition, the position of the target ball needs to be placed manually, and the operation error of the worker is difficult to accurately control, and the method cannot measure the perpendicularity, and the perpendicularity needs to be measured additionally.

[0005] In addition, the fitted circle center is not on the reference plane for evaluating the position degree, so the farther the fitted circle center is from the tube plate plane, the lower the measurement accuracy is, and the measurement accuracy of the tube plate hole position degree is correspondingly reduced.

[0006] Therefore, how to improve the efficiency while ensuring and improving the measurement accuracy has become a difficult problem to solve. SUMMARY

[0007] In order to overcome the above problems, the inventors have made intensive research and designed a tube plate hole position degree and perpendicularity measuring auxiliary device and method, in which a size-appropriate plug-in measuring fixing seat is arranged, the target ball can be limited at the most appropriate position, the center position of the target ball is directly measured to obtain the circle center position of the tube plate hole, the working efficiency is improved, the measurement error and the target ball placement position deviation and other adverse factors are reduced, and the efficiency and accuracy of the tube plate hole measurement are greatly improved, so that the application is completed.

[0008] Specifically, the purpose of the present application is to provide a tube plate hole position degree and perpendicularity measuring auxiliary device, which measures the tube plate hole position degree and perpendicularity by a laser tracker matched with a target ball.

[0009] The device comprises a plug-in measuring fixing seat.

[0010] In the measurement, the target ball is fixedly arranged in the tube plate hole to be measured by the measurement fixing seat.

[0011] The measurement fixing seat comprises a cylindrical main body 1, and a force bearing plate 2 is arranged around the top of the main body 1.

[0012] Preferably, the outer diameter of the main body 1 is within the precision fit tolerance range of the tube plate hole.

[0013] The lower surface of the force bearing plate 2 is perpendicular to the main body 1.

[0014] More preferably, the main body 1 and the force bearing plate 2 are integrally formed.

[0015] A blind hole 11 in the shape of an inverted circular truncated cone is formed in the middle of the top of the main body 1.

[0016] The target ball is arranged in the blind hole 11, and the target ball cannot move in the horizontal direction.

[0017] Preferably, the circular cone angle corresponding to the inverted circular truncated cone is α, and the size of the α is set such that the center of the target ball coincides with the center position of the tube plate hole.

[0018] A magnet 12 is arranged inside the main body 1 below the blind hole 11.

[0019] The target ball is an iron target ball that can be attracted by the magnet.

[0020] The force bearing plate 2 is arranged above the blind hole 11, and the force bearing plate 2 does not block the blind hole 11.

[0021] Preferably, the force bearing plate 2 is in the shape of a circular ring, and the inner diameter of the force bearing plate 2 is consistent with the maximum inner diameter of the blind hole 11.

[0022] A slope 21 is formed in the inner side of the force bearing plate 2.

[0023] The slope 21 is located on the top surface of the force bearing plate 2, the bottom end of the slope 21 is adjacent to the blind hole 11, and the top end of the slope 21 extends to the top edge of the force bearing plate 2.

[0024] Preferably, the region of the force bearing plate 2 where the slope 21 is formed corresponds to a central angle of 70-120 degrees, and more preferably 90 degrees.

[0025] The inclination angle of the slope 21 is β, and β is less than or equal to 25 degrees.

[0026] The application also provides a tube plate hole position degree measurement method.

[0027] The method is implemented by using the tube plate hole position degree and perpendicularity measurement auxiliary device described above.

[0028] Preferably, the method includes the following steps:

[0029] Step 1: Select the outer diameter of the main body 1 according to the precision fit tolerance of the tube sheet hole, and select the cone angle α according to the outer diameter of the target ball;

[0030] Step 2: Place the measuring fixture on the tube sheet, that is, insert the cylindrical body 1 into the tube sheet hole, and the load-bearing plate 2 is attached to the upper surface of the tube sheet.

[0031] Step 3: Place the target ball into the blind hole 11.

[0032] Step 4: The center coordinates of the target ball are directly measured using a laser tracker. These coordinates are the center coordinates of the tube sheet hole.

[0033] Step 5: Input the center position coordinates of the tube sheet hole into the SA software to obtain the position of the tube sheet hole.

[0034] The present invention also provides a method for measuring the perpendicularity of tube sheet holes.

[0035] This method is achieved through the tube sheet hole position and perpendicularity measurement auxiliary device described above;

[0036] Preferably, the method includes the following steps:

[0037] Step 1: Select the outer diameter of the main body 1 according to the precision fit tolerance of the tube sheet hole, and select the cone angle α according to the outer diameter of the target ball;

[0038] Step 2: Place the measuring fixture on the tube sheet, that is, insert the cylindrical body 1 into the tube sheet hole, and the load-bearing plate 2 is attached to the upper surface of the tube sheet.

[0039] Step 3: Place the target ball into the blind hole 11.

[0040] Step 4: The center coordinates of the target ball are directly measured using a laser tracker. These coordinates are the center coordinates of the tube sheet hole.

[0041] Step 5: Pull the measuring fixture out of the tube sheet by a certain distance, ensuring that about half of the main body 1 is still inside the tube sheet hole. Then, measure the center coordinates of the target ball again using the laser tracker.

[0042] Step 6: Obtain the axis of the tube hole by connecting the center position coordinates of the target ball measured twice, and obtain the perpendicularity of the tube hole by combining the position coordinates of the upper surface of the tube plate.

[0043] The present invention also provides a method for measuring the perpendicularity of tube sheet holes.

[0044] This method is achieved through the tube sheet hole position and perpendicularity measurement auxiliary device described above;

[0045] Preferably, the method includes the following steps:

[0046] Step 1: Select the outer diameter of the main body 1 according to the precision fit tolerance of the tube sheet holes;

[0047] Step 2: Place the measuring fixture on the tube sheet, that is, insert the cylindrical body 1 into the tube sheet hole, and the load-bearing plate 2 is attached to the upper surface of the tube sheet.

[0048] Step 3: Insert a feeler gauge into the gap between the upper surface of the tube sheet and the load-bearing plate 2. The value obtained is the perpendicularity of the tube sheet hole.

[0049] The beneficial effects of this invention include:

[0050] (1) The tube sheet hole position and perpendicularity measurement auxiliary device provided by the present invention has a novel structure, is simple to manufacture and has low cost. Its blind hole center is designed to be concentric with the hole on the circular ring being measured or the tube sheet hole, and the target ball center is on the reference plane, resulting in high measurement accuracy.

[0051] (2) The tube sheet hole position and perpendicularity measurement auxiliary device provided by the present invention has a small structure, can be used in narrow spaces, is easy to operate, and has many application scenarios;

[0052] (3) The tube sheet hole position and perpendicularity measurement auxiliary device and method provided by the present invention can be used to measure different geometric tolerances, and can be measured from multiple directions and angles without being limited by the workpiece placement position. Attached Figure Description

[0053] Figure 1 A schematic diagram of the auxiliary device for measuring the position and perpendicularity of tube sheet holes is shown.

[0054] Figure 2 A top view of the auxiliary device for measuring the position and perpendicularity of tube sheet holes is shown;

[0055] Figure 3 A schematic diagram showing the placement of a target ball on the auxiliary device for measuring the position and perpendicularity of tube sheet holes;

[0056] Figure 4 A three-dimensional structural schematic diagram of the auxiliary device for measuring the position and perpendicularity of tube sheet holes is shown;

[0057] Figure 5 A cross-sectional view of the auxiliary device for measuring the position and perpendicularity of tube sheet holes is shown, where the magnet is not shown;

[0058] Figure 6 The diagram illustrates the deviation between the measurement results and the actual positional accuracy in the embodiments and comparative examples.

[0059] Figure Labels

[0060] 1-Main Body

[0061] 11 - Blind Hole

[0062] 12 - Magnet

[0063] 2-Supporting plate

[0064] 21 - Slope

[0065] 3-Target Ball Detailed Implementation

[0066] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Through these descriptions, the features and advantages of the present invention will become clearer and more apparent.

[0067] The term “exemplary” as used herein means “serving as an example, embodiment, or illustration.” Any embodiment illustrated herein as “exemplary” is not necessarily to be construed as superior to or better than other embodiments. Although various aspects of embodiments are shown in the accompanying drawings, the drawings are not necessarily drawn to scale unless specifically indicated otherwise.

[0068] The tube sheet hole position and perpendicularity measurement auxiliary device provided by the present invention, such as Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, the position and perpendicularity are specifically measured using a laser tracker equipped with a target ball. The tube sheet holes mentioned in this application include the tube sheet holes of the steam generator tube sheet, as well as the openings on the feedwater ring of the steam generator. The device includes an insertion-type measuring fixture. During measurement, the target ball is fixedly placed in the tube sheet hole to be measured through the measuring fixture, and the target ball is illuminated by the laser tracker to directly obtain the center position coordinates of the target ball, thereby obtaining the center coordinates of the tube sheet hole.

[0069] The laser tracker described in this application can be the RadianPlus laser tracker from API Corporation, with a target ball having a diameter of 12.7 mm.

[0070] In a preferred embodiment, the measuring fixture includes a cylindrical body 1, with a support plate 2 arranged around the top of the body 1; the length of the body 1 is generally selected to be more than 1 times the diameter to ensure that it can still be radially limited after being pulled upward a certain distance; the bottom of the support plate 2 is horizontally arranged, and its maximum thickness is generally set to 3-5mm, which is sufficient to meet the installation strength.

[0071] Preferably, the outer diameter of the main body 1 is within the precision fit tolerance range of the tube sheet hole; that is, the outer diameter of the main body 1 is consistent with the inner diameter of the tube sheet hole, and the tolerance zone of the outer diameter of the main body 1 is smaller than and completely falls within the tolerance zone of the inner diameter of the tube sheet hole. This ensures that the main body 1 can be inserted into the tube sheet hole, while minimizing the gap between the two and improving the coaxiality between the main body 1 and the tube sheet hole.

[0072] The lower surface of the load-bearing plate 2 is perpendicular to the main body 1; the precision requirement of this vertical structure is as high as possible in order to improve the accuracy of subsequent measurements of related parameters such as verticality.

[0073] More preferably, the main body 1 and the load-bearing plate 2 are integrally formed, that is, they are formed by one-time casting, forging or other methods, avoiding processing methods such as welding that may lead to increased precision errors.

[0074] In a preferred embodiment, a frustum-shaped blind hole 11 is provided in the middle of the top of the main body 1. The frustum is the shape of a cone after the tip is removed. The frustum is an inverted frustum with the thin end facing down and the thick end facing up.

[0075] The target ball 3 is placed inside the blind hole 11, and the target ball cannot move horizontally; that is, the target ball is limited in the horizontal direction through the inverted frustum-shaped blind hole.

[0076] Preferably, the cone angle corresponding to the inverted frustum is α, that is, the cone angle when the tip of the cone is not removed is α; by setting the size of α, the center of the target ball is located at the center position of the tube sheet hole, that is, on the axis of the tube sheet hole, and also on the upper surface of the tube sheet hole; depending on the size of the target ball, the angle of α needs to be specifically selected so that the inverted frustum can accurately support the target ball at the predetermined position.

[0077] The target ball has a radius of R. The blind hole 11 in the device is shaped like an inverted frustum. The maximum diameter of the top of the blind hole 11 is D1, and the diameter of the bottom of the device is D2. The cone angle α in this application can be obtained by the following formula:

[0078]

[0079] like Figure 1 As shown in the diagram; preferably, the diameter of the tube sheet hole is 18-20 mm, so the range of D2 is 18-20 mm. The relationship between the maximum diameter of the blind hole top and the diameter of the device bottom is that D1 is 4 mm smaller than D2, meaning the range of D1 is 14-16 mm. In the preferred embodiment, the target ball diameter is 12.7 mm, meaning the 2R value is 12.7 mm. Calculations show that α is 49.8° to 74.9°. Therefore, we preferably set the value of α to 50 to 70 degrees.

[0080] In a preferred embodiment, a magnet 12 is disposed inside the main body 1 below the blind hole 11;

[0081] The target ball is an iron target ball that can be attracted by a magnet. The magnet further secures the target ball, preventing it from rolling during measurement, ensuring measurement accuracy, avoiding measurement errors caused by human negligence, improving measurement efficiency, and saving measurement time.

[0082] In a preferred embodiment, the load-bearing plate 2 is disposed above the blind hole 11, and the load-bearing plate 2 does not obstruct the blind hole 11;

[0083] Preferably, the load-bearing plate 2 is annular, and its inner diameter is the same as the maximum inner diameter of the blind hole 11. When placing the target ball into the blind hole, the target ball first passes through the middle of the load-bearing plate 2 and then enters the blind hole 11. This design makes the blind hole more precise in machining and less susceptible to the influence of the load-bearing plate and other related structures.

[0084] In a preferred embodiment, based on the bearing plate 2 being a circular annular plate, a ramp 21 is formed on the inner side of the bearing plate 2.

[0085] The ramp 21 is located on the top surface of the load-bearing plate 2, with its bottom end near the blind hole 11, i.e., near the bottom end of the load-bearing plate, and its top end extending to the top edge of the load-bearing plate 2; Figure 1 , Figure 3 , Figure 4 and Figure 5 As shown in the diagram, the cross-section of the ramp 21 is triangular in the cross-sectional view;

[0086] Preferably, the central angle corresponding to the area on the load-bearing plate 2 where the ramp 21 is formed is 70 to 120 degrees, more preferably 90 degrees, such as... Figure 2 As shown in the image.

[0087] Preferably, the inclination angle of the ramp 21 is β, and the value of β is below 25 degrees, preferably 20 degrees. By creating this ramp in this application, the applicability of the laser tracker is expanded, the load-bearing plate does not obstruct the propagation path of the laser, and the laser tracker can perform multi-directional and multi-angle measurements without environmental limitations.

[0088] This application also provides a method for measuring the position of tube sheet holes, which is achieved through an auxiliary device for measuring the position and perpendicularity of tube sheet holes;

[0089] Preferably, the method includes the following steps:

[0090] Step 1: Select the outer diameter of the main body 1 according to the precision fit tolerance of the tube sheet hole, and select the cone angle α according to the outer diameter of the target ball; so that after the target ball is placed in the blind hole, the center of the target ball is exactly located at the center position of the tube sheet hole, that is, on the axis of the tube sheet hole, and also on the upper surface of the tube sheet hole, or on the fitting plane of the water supply ring opening.

[0091] Step 2: Place the measuring fixture on the tube sheet, that is, insert the cylindrical body 1 into the tube sheet hole, and the load-bearing plate 2 is attached to the upper surface of the tube sheet.

[0092] Step 3: Place the target ball into the blind hole 11. Since the structure of the blind hole 11 ensures that the target ball will reach the predetermined position, there is no need to adjust the position of the target ball, and there are no special requirements for the method of placing the target ball.

[0093] Step 4: The center position coordinates of the target ball are directly measured using a laser tracker. These coordinates are the center position coordinates of the tube sheet hole. The center position coordinates of the target ball are directly displayed in the SA software. In this step, it is not necessary to measure multiple points to fit the center coordinates of the tube sheet hole, which greatly saves the measurement time and reduces measurement errors.

[0094] Step 5: Obtain the center position coordinates of the target ball in each tube sheet hole one by one using SA software, thereby obtaining the actual position of all holes. The SA software mentioned in this application is SpatialAnalyzer software from New River Kinematics.

[0095] This application also provides a method for measuring the perpendicularity of tube sheet holes, which is achieved through an auxiliary device for measuring the position and perpendicularity of tube sheet holes;

[0096] Preferably, the method includes the following steps:

[0097] Step 1: Select the outer diameter of the main body 1 according to the precision fit tolerance of the tube sheet hole, and select the cone angle α according to the outer diameter of the target ball;

[0098] Step 2: Place the measuring fixture on the tube sheet, that is, insert the cylindrical body 1 into the tube sheet hole, and the load-bearing plate 2 is attached to the upper surface of the tube sheet.

[0099] Step 3: Place the target ball into the blind hole 11.

[0100] Step 4: The center coordinates of the target ball are directly measured using a laser tracker. These coordinates are the center coordinates of the tube sheet hole.

[0101] Step 5: Pull the measuring fixture out of the tube sheet by a certain distance, ensuring that about half of the length of the main body 1 is still inside the tube sheet hole to prevent the main body 1 from tilting in the radial direction. Then, measure the center position coordinates of the target ball again using a laser tracker.

[0102] Step 6: Obtain the axis of the tube hole by connecting the center position coordinates of the target ball measured twice, and obtain the perpendicularity of the tube hole by combining the position coordinates of the upper surface of the tube plate.

[0103] This application also provides a method for measuring the perpendicularity of tube sheet holes, which is achieved through an auxiliary device for measuring the position and perpendicularity of tube sheet holes;

[0104] Preferably, the method includes the following steps:

[0105] Step 1: Select the outer diameter of the main body 1 according to the precision fit tolerance of the tube sheet holes;

[0106] Step 2: Place the measuring fixture on the tube sheet, that is, insert the cylindrical body 1 into the tube sheet hole, and the load-bearing plate 2 is attached to the upper surface of the tube sheet.

[0107] Step 3: Insert a feeler gauge into the gap between the upper surface of the tube sheet and the load-bearing plate 2. The obtained value is the perpendicularity of the tube sheet hole. The feeler gauge can be a SATA 09407 feeler gauge.

[0108] Example:

[0109] Select a tube sheet with 1000 holes as the tube sheet component to be tested for hole position accuracy;

[0110] Using the tube sheet hole position measurement method provided in this application, a measuring fixture with a corresponding outer diameter is set according to the size of the tube sheet hole, and a corresponding cone angle α is selected according to the size of the target ball, so that when the target ball is placed in the blind hole, the center position of the target ball is the center position of the tube sheet hole.

[0111] Insert the measuring fixture into the tube sheet hole, then place the target ball in the tube sheet. Use a laser tracker to measure and record the center position coordinates of the target ball. Then insert the measuring fixture into another tube sheet hole and repeat the above operation until the center position coordinates of the target ball are obtained for each tube sheet hole to be tested.

[0112] By inputting the center coordinates of the target ball into the SA software, the positional information of each tube sheet hole can be obtained.

[0113] In the above experimental example, the time used for measurement and calculation was 4 hours.

[0114] Comparative example:

[0115] The same tube sheet as in the example was selected, and the position of the tube sheet holes therein was measured using conventional methods.

[0116] First, the operator places the target ball in the tube sheet hole and manually clamps and fixes the target ball. The coordinate values ​​of the four edge positions inside the tube sheet hole are measured by a laser tracker, and then the center position coordinates of the tube sheet hole are obtained by fitting and calculation.

[0117] Place the target ball into the other tube sheet holes to be tested, and repeat the above operation until the center position coordinates of each tube sheet hole are obtained.

[0118] By inputting the center coordinates of the target ball into the SA software, the positional information of each tube sheet hole can be obtained.

[0119] In the above comparative examples, the measurement and calculation time was 16 hours.

[0120] As can be seen from the specific data in the above embodiments and comparative examples, the tube sheet hole position and perpendicularity measurement method provided in this application can improve work efficiency by 300%.

[0121] Using an Edwards Legend 575 coordinate measuring machine with an accuracy of 0.15 μm, the positional accuracy of 10 randomly selected tube holes on the tube sheet was measured. These measurements were taken as the true values. The deviation between the positional accuracy measured using a fixed base in this embodiment and the true positional accuracy was compared. The deviation between the positional accuracy measured manually in the comparative example and the true positional accuracy was also compared. Figure 6 As shown, Figure 6 The horizontal axis represents the hole number, and the vertical axis represents the deviation from the true value. Figure 6 It is evident that the positional accuracy obtained by measuring with a fixed base in the embodiment is closer to the true value and is more accurate. Comprehensive calculations show that the tube sheet hole positional and perpendicularity measurement auxiliary device provided in this application can improve the measurement accuracy by 50%.

[0122] The present invention has been described above with reference to preferred embodiments; however, these embodiments are merely exemplary and illustrative. Various substitutions and modifications can be made to the present invention based on these embodiments, all of which fall within the scope of protection of the present invention.

Claims

1. An auxiliary device for measuring the position and perpendicularity of tube sheet holes, characterized in that, The position and perpendicularity of the tube sheet holes were measured using a laser tracker equipped with a target ball. The device includes an insert-type measuring fixture; During measurement, the target ball is fixedly placed in the tube sheet hole to be measured using the measuring fixture. The measuring fixture includes a cylindrical body (1), and a load-bearing plate (2) is provided around the top of the body (1); The outer diameter of the main body (1) is within the precision fit tolerance range of the tube sheet hole; The lower surface of the load-bearing plate (2) is perpendicular to the main body (1); The main body (1) and the load-bearing plate (2) are integrally formed; A frustum-shaped blind hole (11) is provided at the top center of the main body (1). The target ball (3) is placed inside the blind hole (11) and the target ball cannot move horizontally. The cone angle corresponding to the inverted frustum is α. By setting the size of α, the center of the target ball coincides with the center of the tube sheet hole. The radius of the target ball is R, the maximum diameter of the top of the blind hole (11) is D1, and the cone angle α is obtained by the following formula: The value of α is set to be between 50 and 70 degrees; The load-bearing plate (2) is positioned above the blind hole (11), and the load-bearing plate (2) does not obstruct the blind hole (11); The load-bearing plate (2) is annular, and the inner diameter of the load-bearing plate (2) is the same as the maximum inner diameter of the blind hole (11). A ramp (21) is provided on the inner side of the load-bearing plate (2). The ramp (21) is located on the top surface of the load-bearing plate (2), the bottom end of the ramp (21) is close to the blind hole (11), and the top end of the ramp (21) extends to the top edge of the load-bearing plate (2). On the load-bearing plate (2), the central angle corresponding to the area where the ramp (21) is opened is 70 to 120 degrees; The inclination angle of the slope (21) is β, and the value of β is less than 25 degrees.

2. The auxiliary device for measuring the position and perpendicularity of tube sheet holes according to claim 1, characterized in that, Inside the main body (1), a magnet (12) is provided below the blind hole (11); The target ball is an iron target ball that can be attracted by a magnet.

3. A method for measuring the position of tube sheet holes, characterized in that, This method is achieved using the tube sheet hole position and perpendicularity measurement auxiliary device as described in any one of claims 1-2; The method includes the following steps: Step 1: Select the outer diameter of the main body (1) according to the precision fit tolerance of the tube sheet hole, and select the cone angle α according to the outer diameter of the target ball; Step 2: Place the measuring fixture on the tube sheet, that is, insert the cylindrical body (1) into the tube sheet hole and the load-bearing plate (2) is in close contact with the upper surface of the tube sheet; Step 3: Place the target ball into the blind hole (11); Step 4: The center position coordinates of the target ball are directly measured by the laser tracker. These coordinates are the center position coordinates of the tube sheet hole. The center position coordinates of the target ball are directly reflected in the SA software. Step 5: Use SA software to obtain the center position coordinates of the target ball in each tube sheet hole one by one, and obtain the actual position of all holes.

4. A method for measuring the perpendicularity of tube sheet holes, characterized in that, This method is achieved using the tube sheet hole position and perpendicularity measurement auxiliary device as described in any one of claims 1-2; The method includes the following steps: Step 1: Select the outer diameter of the main body (1) according to the precision fit tolerance of the tube sheet hole, and select the cone angle α according to the outer diameter of the target ball; Step 2: Place the measuring fixture on the tube sheet, that is, insert the cylindrical body (1) into the tube sheet hole and place the load-bearing plate (2) on the upper surface of the tube sheet. Step 3, place the target ball into the blind hole (11). Step 4: The center coordinates of the target ball are directly measured using a laser tracker. These coordinates are the center coordinates of the tube sheet hole. Step 5: Pull the measuring fixture out of the tube sheet by a certain distance, ensuring that about half of the main body (1) is still inside the tube sheet hole. Then, measure the center coordinates of the target ball again using a laser tracker. Step 6: Obtain the axis of the tube hole by connecting the center position coordinates of the target ball measured twice, and obtain the perpendicularity of the tube hole by combining the position coordinates of the upper surface of the tube plate.

5. A method for measuring the perpendicularity of tube sheet holes, characterized in that, This method is achieved using the tube sheet hole position and perpendicularity measurement auxiliary device as described in any one of claims 1-2; The method includes the following steps: Step 1: Select the outer diameter of the main body (1) according to the precision fit tolerance of the tube sheet holes; Step 2: Place the measuring fixture on the tube sheet, that is, insert the cylindrical body (1) into the tube sheet hole and place the load-bearing plate (2) on the upper surface of the tube sheet. Step 3: Insert a feeler gauge into the gap between the upper surface of the tube sheet and the load-bearing plate (2), and the obtained value is the perpendicularity of the tube sheet hole.

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