Measuring Method and Measuring Device for Geometric Dimensions of Pump Casing Flange

Abstract

The present invention provides a method and a measuring device for measuring the geometric dimensions of a pump housing flange. The method includes Step 1: Install a shielding plug in the central opening on the side where the flange sealing surface of the pump housing is located, and install a coordinate measuring machine on the shielding plug; Step 2: Rotate the rotating arm of the coordinate measuring machine circumferentially along the flange sealing surface; Step 3: Calculate the circumferential flatness and radial flatness of the surface on the side where the flange sealing surface is located according to the coordinate data of each measurement point. The measuring device includes a shielding plug for shielding radiation installed in the central opening on the side where the flange sealing surface of the pump is located, and a coordinate measuring machine for measuring the geometric dimensions of the surface on the side where the flange sealing surface is located. Through the cooperation of the shielding plug and the coordinate measuring machine, it is possible to measure the geometric dimensions of the surface on the side where the sealing surface of the flange is located, overcome the difficulties in measuring the geometric dimensions of a large flange surface, and shorten the measurement period of the geometric dimensions of the pump housing flange.

Description

Technical Field

[0001] The present invention relates to the field of measurement of the geometric dimensions of the large flange sealing surface of a pump casing, and particularly to a method and a device for measuring the geometric dimensions of a pump casing flange. Background Art

[0002] The hydraulic components of a nuclear power plant reactor coolant pump mainly consist of a short section, a back coupling, a pump shaft, an impeller, a thermal shield assembly, a guide vane, etc. The hydraulic component flange and the pump casing flange adopt a static sealing technology with a graphite wound gasket. To ensure the sealing function, the hydraulic components of the coolant pump, the main flange, the motor support, and the pump casing flange are fastened by 24 pump casing flange bolts evenly distributed in the circumferential direction, and the bolt fastening torque is relatively large. According to the preventive maintenance strategy, the hydraulic components of the coolant pump are planned to be replaced every 20 - 30 years, and the pump casing of the coolant pump is welded integrally with the main pipeline of the reactor coolant system and is not replaced. Due to the long-term influence of mechanical and thermal stresses, the pump casing flange will produce varying degrees of deformation in the circumferential and radial directions. To evaluate whether the geometric dimensions of the pump casing flange meet the sealing requirements after the replacement of the hydraulic components, it is necessary to measure and evaluate the geometric dimensions of the pump casing flange surface.

[0003] The sealing position between the pump casing and the hydraulic component is the pressure boundary of the reactor coolant system. Therefore, the measurement accuracy of the geometric dimensions of the flange surface is particularly important. To sum up, there are the following difficulties in measuring the geometric dimensions of the pump casing flange:

[0004] 1. The pump casing flange has a large size, the pump casing cannot be disassembled, the on-site space is narrow, and large precision measuring instruments cannot be used for measurement;

[0005] 2. After long-term operation, the irradiation dose rate inside and outside the pump casing is relatively high, and long-term measurement will cause accidental irradiation to personnel;

[0006] 3. The replacement of the hydraulic components of the coolant pump is a long-term maintenance project, and the normal maintenance period accounts for 2 / 3 of the refueling overhaul period of the nuclear power plant reactor unit. If the measurement and data post-processing take a long time, it will cause unnecessary time costs.

[0007] The main technical idea of the previous measurement process for the geometric dimensions of the pump casing flange surface was as follows: Reflective magnetic tiles were evenly pasted on the pump casing flange and identification rods were placed, and a 3D camera was used to take pictures of the pump casing flange. The on-site taken pictures needed to be returned to the manufacturer for data post-processing and evaluation, and the planned construction period was about 2 - 3 days. This measurement technology requires high equipment rental fees and technical support fees. At the same time, the measurement accuracy is highly dependent on the on-site light intensity and the reproducibility is poor. Summary of the Invention

[0008] The technical problem to be solved by the present invention is to provide a method and a device for measuring the geometric dimensions of a pump casing flange to address the above-mentioned defects in the related technology, specifically as follows.

[0009] The technical solution adopted by the present invention to solve its technical problems includes: providing a method for measuring the geometric dimensions of a pump housing flange, including:

[0010] Step 1: Install a shielding plug in the central opening on the side where the flange sealing surface of the pump housing is located. The shielding plug includes an installation surface, and the installation surface is on the same side as the sealing surface of the flange. Install a coordinate measuring machine on the installation surface. The coordinate measuring machine includes a base, a rotating arm rotatably arranged circumferentially on the base, and a measuring needle arranged on the rotating arm. The rotating arm is arranged to rotate circumferentially along the flange sealing surface;

[0011] Step 2: Rotate the rotating arm circumferentially along the flange sealing surface, and measure the coordinate data of multiple measurement points on the sealing surface of the flange through the measuring needle. The measurement points include multiple points located at the circumferential equally divided positions on the surface on the side where the flange sealing surface is located, and each point located at the circumferential equally divided position includes multiple points located at the radial equally divided positions;

[0012] Step 3: Calculate the circumferential flatness and radial flatness of the surface on the side where the flange sealing surface is located according to the coordinate data of each measurement point.

[0013] Preferably, in Step 1, the step of installing the shielding plug in the central opening on the side where the flange sealing surface is located includes: the shielding plug is in clearance fit with the flange, and the convex structure inside the pump housing supports the side of the shielding plug facing away from the installation surface.

[0014] Preferably, Step 1 includes: after installing the shielding plug in the central opening on the side where the flange sealing surface is located, install a base on the installation surface, and then install the coordinate measuring machine on the base and level it.

[0015] Preferably, a sealing groove extending circumferentially is provided on the sealing surface of the flange; in Step 2, the sealing surface includes a first surface and a second surface respectively located outside and inside the sealing groove in the radial direction. The measurement points include points on the bottom surface of the sealing groove, points on the first surface, and points on the second surface, and then calculate the depth of the sealing groove, and calculate the circumferential flatness and radial flatness of the first surface and the second surface.

[0016] Preferably, in Step 2, the surface on the side where the flange sealing surface is located includes a flange top surface, and the flange top surface is higher than the sealing surface of the flange in the flange axial direction; the measurement points include points on the flange top surface;

[0017] Step 3 includes: taking the top surface of the flange as the measurement reference and measuring the coordinate data of each measurement point.

[0018] Preferably, the circumferential equally divided position is the 24 - equally divided position.

[0019] Preferably, the radial equally divided position is the 9 - equally divided position.

[0020] The technical solution adopted by the present invention to solve its technical problems includes: providing a measuring device for the geometric dimension of a pump - housing flange for implementing the above - mentioned measuring method for the geometric dimension of a pump - housing flange. The measuring device includes a shielding plug for shielding radiation in a central opening on one side where the flange sealing surface of the pump housing is located and a coordinate measuring machine for measuring the geometric dimensions of the surface on one side where the flange sealing surface is located. The shielding plug includes a mounting surface that is on the same side as the flange sealing surface when installed in the central opening of the flange, and the coordinate measuring machine is arranged on the mounting surface; the coordinate measuring machine includes a base, a rotating arm rotatably arranged on the base in the circumferential direction, and a measuring needle arranged on the rotating arm.

[0021] Preferably, the shielding plug is in clearance fit with the flange, and the convex structure inside the pump housing supports the side of the shielding plug facing away from the mounting surface.

[0022] Preferably, it includes a base detachably arranged on the mounting surface of the shielding plug, and the coordinate measuring machine is arranged on the base.

[0023] Implementing the technical solution of the present invention has at least the following beneficial effects: Through the cooperation of the shielding plug and the coordinate measuring machine, the measuring device and method for the geometric dimension of the pump - housing flange can measure the geometric dimensions of the surface on one side where the flange sealing surface is located, overcome the difficulties in measuring the geometric dimensions of the large - scale flange sealing surface, and shorten the measurement period of the geometric dimensions of the pump - housing flange. Description of the Drawings

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the following - described drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0025] Figure 1 It is a top - view of the flange and measurement points in the measuring device and method for the geometric dimension of the pump - housing flange of the present invention (the dots in the figure represent the measurement points).

[0026] Figure 2 It is in the measuring device for the geometric dimension of the pump - housing flange of the present invention and the flange Figure 1Partial sectional view at position A-A (the dots in the figure represent measurement points).

[0027] Figure 3 is Figure 2 a partial view of.

[0028] The reference numerals in the figure denote: coordinate measuring machine 1, base 11, rotary arm 12, measuring probe 13, shielding plug 2, mounting surface 21, base 3, pump housing 4 of coolant pump, convex structure 41, flange 5, first surface 51, second surface 52, sealing groove 53, top surface 54 of flange, measurement point 6, point G on the bottom surface of the sealing groove, point E on the first surface, point I on the second surface, point B on the top surface of the flange. Detailed implementation manners

[0029] For a clearer understanding of the technical features, objectives, and effects of the present invention, the specific implementation manners of the present invention will now be described in detail with reference to the accompanying drawings. It should be understood that if terms such as "upper", "lower", "longitudinal", "transverse", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicating orientation or position relationship appear in the text, they are based on the orientation or position relationship shown in the drawings, and are constructed and operated in a specific orientation. This is only for the convenience of describing the technical solution, rather than indicating that the indicated device or element must have a specific orientation. Therefore, it should not be construed as a limitation to the present invention. It should also be noted that unless otherwise clearly specified and limited, if terms such as "installed", "connected", "connected to", "fixed", "set" appear in the text, they should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the internal communication of two elements or the interaction relationship between two elements. When an element is referred to as being "on" or "under" another element, the element can be "directly" or "indirectly" located above the other element, or there may also be one or more intermediate elements. If terms such as "first", "second", etc. appear in the text, they are only for the convenience of describing the technical solution, and cannot be construed as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first", "second", etc. may explicitly or implicitly include one or more of such features. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] In the following description, for the purpose of illustration rather than limitation, specific details such as specific system structures, technologies, etc. are presented in order to thoroughly understand the embodiments of the present invention. However, those skilled in the art should clearly understand that the present invention can also be implemented in other embodiments without these specific details. In other cases, the detailed descriptions of well-known systems, devices, circuits, and methods are omitted to avoid unnecessary details from interfering with the description of the present invention.

[0031] See Figures 1-3 For a pump housing flange geometric dimension measuring device in an embodiment of the present invention, which is used to implement the following pump housing flange geometric dimension measuring method. The pump housing flange geometric dimension measuring device includes a shielding plug 2 installed in the central opening on one side of the sealing surface of the flange 5 of the pump housing 4 of the coolant pump, and a coordinate measuring machine 1 for measuring the geometric dimensions of the surface on one side of the sealing surface of the flange 5. The shielding plug 2 includes a mounting surface 21 on the same side as the sealing surface of the flange 5 when installed in the central opening of the coolant pump flange 5, and the coordinate measuring machine 1 is arranged on the mounting surface 21; the coordinate measuring machine 1 includes a base 11, a rotating arm 12 rotatably arranged on the base 11, and a measuring needle 13 extending outwardly on the rotating arm 12 for measuring coordinate data. The shielding plug 2 plays a role in shielding radiation to ensure the safety of the measuring operators. At the same time, the shielding plug 2 plays a role in supporting the coordinate measuring machine 1 to realize the installation of the coordinate measuring machine 1 on the flange 5 of the pump housing 4 of the coolant pump.

[0032] Through the cooperation of the shielding plug 2 and the coordinate measuring machine 1, the pump housing flange geometric dimension measuring device can measure the geometric dimensions of the surface on one side of the sealing surface of the flange 5, overcome the difficulties in measuring the geometric dimensions of the sealing surface of the large flange 5, and shorten the measuring period of the geometric dimensions of the pump housing flange 5. The pump housing flange geometric dimension measuring device can be applied to the measurement of the geometric dimensions of the flange of the pump housing of the nuclear power plant reactor coolant pump, but is not limited thereto. The geometric dimensions of the large flange 5 of other pump housings can also be measured. For the specific measuring method, see the following pump housing flange geometric dimension measuring method.

[0033] The coordinate measuring machine 1 can measure the coordinate data of the measuring points on the X, Y, and Z axes.

[0034] Preferably, the shielding plug 2 is a biological shielding plug, which refers to a plug made of materials that can reduce radiation to below the human allowable dose level.

[0035] Preferably, the mounting surface 21 is arranged on the axial side of the shielding plug 2, and the shielding plug 2 is axially installed into the central opening of the flange 5 along the axis of the flange 5.

[0036] Preferably, the measuring needle 13 includes a connecting end connected to the rotating arm 12 and a free end away from the rotating arm 12. The measuring needle 13 is inclined towards the sealing surface of the flange 5 and the free end is closer to the sealing surface of the flange 5 than the connecting end.

[0037] Preferably, the shielding plug 2 is in clearance fit with the flange 5, and the internal structure of the pump housing 4 supports the side of the shielding plug 2 facing away from the mounting surface 21. Specifically, the internal structure of the pump housing 4 that supports the shielding plug 2 can be a convex structure 41 inside the pump housing 4 (such as an annular structure protruding towards the central opening), and the position of the convex structure 41 corresponds to the central opening on the side where the sealing surface of the flange 5 is located. After the shielding plug 2 is inserted into the central opening, the convex structure 41 supports the side of the shielding plug 2 facing away from the mounting surface 21.

[0038] Preferably, the measuring device includes a base 3 provided on the shielding plug 2, and the coordinate measuring machine 1 is provided on the base 3.

[0039] See Figures 1-3 , a method for measuring the form and position dimensions of a pump housing flange in an embodiment of the present invention, which is used for the above-mentioned measuring device for the form and position dimensions of a pump housing flange, includes:

[0040] Step 1: Install the shielding plug 2 in the central opening on the side where the sealing surface of the flange 5 is located. The mounting surface 21 of the shielding plug 2 and the sealing surface of the flange 5 are on the same side. Install the coordinate measuring machine 1 on the mounting surface 21, and the rotating arm 12 is rotatably arranged in the circumferential direction of the sealing surface of the flange 5.

[0041] Step 2: To objectively and accurately evaluate the form and position dimensions of the flange 5, rotate the rotating arm 12 in the circumferential direction of the sealing surface of the flange 5, and measure the coordinate data of multiple measurement points 6 on the flange 5 through the measuring needle 13. The measurement points 6 include multiple points located at the circumferentially equally divided positions on the surface on the side where the sealing surface of the flange 5 is located, and each point located at the circumferentially equally divided position includes multiple points located at the radially equally divided positions.

[0042] Step 3: Calculate the circumferential flatness and radial flatness of the surface on the side where the sealing surface of the flange 5 is located according to the coordinate data of each measurement point 6.

[0043] Preferably, in Step 1, the step of installing the shielding plug 2 in the central opening on the side where the sealing surface of the flange 5 is located includes: the shielding plug 2 is in clearance fit with the flange 5, and the internal structure of the pump housing 4 supports the side of the shielding plug 2 facing away from the mounting surface 21. Specifically, the internal structure of the pump housing 4 that supports the shielding plug 2 can be the convex structure 41 inside the pump housing 4. The position of the convex structure 41 corresponds to the central opening on the side where the sealing surface of the flange 5 is located. When the shielding plug 2 is inserted into the central opening, the convex structure 41 supports the side of the shielding plug 2 facing away from the mounting surface 21.

[0044] Preferably, Step 1 includes: after installing the shielding plug 2 in the central opening on the side where the sealing surface of the flange 5 is located, install the base 3 on the mounting surface 21, and then install the coordinate measuring machine 1 on the base 3 and level it.

[0045] Preferably, step two includes: first, marking measurement points 6 on the surface of one side where the sealing surface of the flange 5 is located, and then measuring the coordinate data of the measurement points 6 of the flange 5 with a measuring needle 13.

[0046] Preferably, a sealing groove 53 extending circumferentially is provided on the sealing surface of the flange 5; in step two, the sealing surface includes a first surface 51 and a second surface 52 that are respectively located outside and inside the sealing groove 53 in the radial direction, and the measurement points 6 include point G on the bottom surface of the sealing groove 53, point E on the first surface 51, and point I on the second surface 52. Furthermore, the depth ε of the sealing groove 53 is calculated to confirm that the depth meets the design requirements, and the circumferential flatness and radial flatness of the first surface 51 and the second surface 52 are calculated.

[0047] Preferably, in step two, the surface of one side where the sealing surface of the flange 5 is located includes the flange top surface 54. The flange top surface 54 is higher than the sealing surface of the flange 5 in the axial direction of the flange 5. In other words, one side where the sealing surface of the flange 5 is located is provided with a sealing surface and the flange top surface 54, and a sealing groove 53 is provided on the sealing surface; the measurement points 6 include point B on the flange top surface 54.

[0048] Since the deformation amount of the flange top surface 54 is extremely small, step three includes: using the flange top surface 54 as the measurement reference to measure the coordinate data of each measurement point 6.

[0049] Preferably, in step two, the coordinate data is the coordinate data in the axial direction of the flange 5, that is, the Z-axis coordinate data defined by the three-coordinate measuring machine 1.

[0050] Preferably, the circumferential equally divided position is the 24-equally divided position, that is, the flange is equally divided into 24 parts along the circumferential direction of the sealing surface, and the measurement points 6 are located at each equally divided position.

[0051] Preferably, the radial equally divided position is the 9-equally divided position. That is, at each circumferential equally divided position of the flange, it is equally divided into 9 parts along the radial direction, and the measurement points 6 are located at each equally divided position. For example, in Figures 1-2 the embodiment, at each circumferential equally divided position, the measurement points 6 distributed along the radial direction include: three measurement points on the bottom surface of the sealing groove 53 - G1, G2, and G3, two measurement points on the first surface 51 - E1 and E2, three measurement points on the second surface 52 - I1, I2, and I3, and one measurement point B1 on the top surface of the pump housing.

[0052] Preferably, step three includes: using the EXCEL formula function to complete the calculation of the radial flatness and circumferential flatness of the surface of the flange 5.

[0053] Specifically, through the measurement in step two, the Z-axis data matrix of all measurement points is obtained:

[0054] Measurement points on the first surface 51:

[0055] Measurement points on the bottom surface of the sealing groove 53:

[0056] Measurement points on the second surface 52:

[0057] Import the above data matrix into EXCEL, and use the pre - edited calculation formula in EXCEL to quickly calculate the geometric dimensions of the pump housing:

[0058] The depth of the sealing groove 53

[0059] Flatness of the first surface 51:

[0060] Radial flatness = max[|E1 i - E2 i |], i = 1, 2, 3,..., 24

[0061]

[0062]

[0063] i = 1, 2, 3,..., 24. When the calculation subscript > 24, the subscript needs to subtract 24.

[0064] Flatness of the bottom surface of the sealing groove 53:

[0065] Radial flatness = max[max(G1 i , G2 i , G3 i ) - min(G1 i , G2 i , G3 i )], i = 1, 2, 3,..., 24

[0066]

[0067]

[0068] i = 1, 2, 3,..., 24. When the calculation subscript > 24, the subscript needs to subtract 24.

[0069] Flatness of the second surface 52:

[0070] Radial flatness = max[max(I1 i , I2 i , I3 i ) - min(I1 i , I2 i , I3 i)], i = 1, 2, 3, ..., 24

[0071]

[0072]

[0073] i = 1, 2, 3, ..., 24. When the calculated subscript > 24, the subscript needs to subtract 24.

[0074] Through the cooperation of the shielding plug 2 and the coordinate measuring machine 1, the method for measuring the geometric dimension of the pump housing flange can measure the geometric dimension of the surface on the side where the sealing surface of the flange 5 is located, overcome the difficulty in measuring the geometric dimension of the sealing surface of the large flange 5, and shorten the measurement period of the geometric dimension of the pump housing flange 5. The method for measuring the geometric dimension of the pump housing flange can be applied to measure the geometric dimension of the flange of the pump housing of the reactor coolant pump in a nuclear power plant, but is not limited thereto. The geometric dimensions of the large flanges 5 of other pump housings can also be measured.

[0075] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes, combinations and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the scope of the claims of the present invention.

Claims

1. A method for measuring the geometric dimensions of a pump housing flange, characterized in that, Including: Step 1: Install the shielding plug (2) in the central opening on the side where the sealing surface of the flange (5) of the pump housing (4) is located. The shielding plug (2) includes an installation surface (21), and the installation surface (21) is on the same side as the sealing surface of the flange (5). Install the coordinate measuring machine (1) on the installation surface (21). The coordinate measuring machine (1) includes a base (11), a rotating arm (12) rotatably arranged circumferentially on the base (11), and a measuring needle (13) arranged on the rotating arm (12). The rotating arm (12) is arranged to be rotatable circumferentially according to the sealing surface of the flange (5); Step 2: Rotate the rotating arm (12) circumferentially according to the sealing surface of the flange (5), and measure the coordinate data of multiple measurement points (6) on the sealing surface of the flange (5) through the measuring needle (13). The measurement points (6) include multiple points at circumferentially equally divided positions on the surface on the side where the sealing surface of the flange (5) is located. Each point at the circumferentially equally divided position includes multiple points at radially equally divided positions; Step 3: Calculate the circumferential flatness and radial flatness of the surface on the side where the sealing surface of the flange (5) is located according to the coordinate data of each measurement point (6); In Step 1, the step of installing the shielding plug (2) in the central opening on the side where the sealing surface of the flange (5) is located includes: The shielding plug (2) is in clearance fit with the flange (5), and the protruding structure (41) inside the pump housing (4) supports the side of the shielding plug (2) facing away from the installation surface (21); Step 1 includes: After installing the shielding plug (2) in the central opening on the side where the sealing surface of the flange (5) is located, install the base (3) on the installation surface (21), and then install the coordinate measuring machine (1) on the base (3) and level it.

2. The method for measuring the geometric dimensions of a pump housing flange according to claim 1, characterized in that, A sealing groove (53) extending circumferentially is provided on the sealing surface of the flange (5); in Step 2, the sealing surface includes a first surface (51) and a second surface (52) respectively located outside and inside the sealing groove (53) in the radial direction. The measurement points (6) include a point (G) on the bottom surface of the sealing groove (53), a point (E) on the first surface (51), and a point (I) on the second surface (52), and then calculate the depth of the sealing groove (53), and calculate the circumferential flatness and radial flatness of the first surface (51) and the second surface (52).

3. The method for measuring the geometric dimensions of a pump housing flange according to claim 1, characterized in that, In Step 2, the surface on the side where the sealing surface of the flange (5) is located includes a flange top surface (54), and the flange top surface (54) is higher than the sealing surface of the flange (5) in the axial direction of the flange (5); the measurement points (6) include a point (B) on the flange top surface (54); Step 3 includes: Using the flange top surface (54) as the measurement reference, measure the coordinate data of each measurement point (6).

4. The method for measuring the geometric dimensions of a pump housing flange according to any one of claims 1-3, characterized in that, The circumferentially equally divided position is the 24-equal division position.

5. The method for measuring the geometric dimensions of a pump housing flange according to any one of claims 1-3, characterized in that, The radially equally divided position is the 9-equal division position.

6. A device for measuring the geometric dimensions of a pump housing flange, characterized in that, For implementing the method for measuring the geometric dimensions of the pump housing flange according to any one of claims 1-5, the measuring device includes a shielding plug (2) for shielding radiation and installed in the central opening on the side where the sealing surface of the flange (5) of the pump housing (4) of the pump is located, and a coordinate measuring machine (1) for measuring the geometric dimensions of the surface on the side where the sealing surface of the flange (5) is located. The shielding plug (2) includes a mounting surface (21) that is on the same side as the sealing surface of the flange (5) when installed in the central opening of the flange (5), and the coordinate measuring machine (1) is arranged on the mounting surface (21); the coordinate measuring machine (1) includes a base (11), a rotating arm (12) rotatably arranged circumferentially on the base (11), and a measuring probe (13) arranged on the rotating arm (12).

7. The device for measuring the geometric dimensions of a pump housing flange according to claim 6, characterized in that, The shielding plug (2) is in clearance fit with the flange (5), and the raised structure (41) inside the pump housing (4) supports the side of the shielding plug (2) facing away from the mounting surface (21).

8. The device for measuring the geometric dimensions of a pump housing flange according to any one of claims 6-7, characterized in that, It includes a base (3) detachably arranged on the mounting surface of the shielding plug (2), and the coordinate measuring machine (1) is arranged on the base (3).

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