Large rotating equipment end face deflection measuring tool and measuring method

Abstract

The invention discloses a tool and a method for measuring deflection of an end face of large rotating equipment. The tool and the method are applied to verticality measurement of the end face of large rotating machinery without a slow motion function and a manual turning function. The tool is provided with a 2 / 3 annular guide rail which is fastened and installed on a mechanical shaft to be tested through an adapter ring and a split installation ring. The dial indicator and the universal swing arm are installed on the guide rail through the sliding block, the top end of the dial indicator abuts against the end face of a to-be-measured bearing, the sliding block can slide on the guide rail along the circumference, the dial indicator slides over two thirds of an arc on the measured end face, and the deflection condition of the bearing within the angle range is obtained through measurement. The tool is simple in structure, convenient to use, high in adaptability and good in practicability.

Description

Technical Field

[0001] This invention relates to the field of maintenance of large rotating machinery, and specifically to a measuring tool and method for measuring end face runout of large rotating equipment. Background Technology

[0002] Bearings, discs, and couplings are common components in rotating machinery. These components are usually connected to the shaft by interference fit. If they are not installed properly, misalignment of the installation angle can easily occur, causing the components to wobble and resulting in vibration problems in the rotating equipment.

[0003] When troubleshooting such faults, the main method is to check the runout of the components suspected of being the excitation source. Currently, the runout of components is generally checked using a runout tester or a magnetic base with a dial indicator. The rotor is rotated manually or by a slow-motion drive, and the measured end face is measured to see if it is perpendicular to the axis during one revolution of the rotor.

[0004] For rotating machinery that is easy to move and rotate, it is very easy to check for runout using the above method. Patents for dedicated testing equipment can also be found. Similar functional patents include CN202322317671.8 "A Runout Measuring Instrument for Shaft Workpieces" and CN202423320032.8 "An Automatic Runout Detector", which are mainly used for end face runout detection of workpieces such as automobile engine shafts.

[0005] However, large rotating machinery such as the three main types of wind turbines, wind turbine generator sets, and steam turbine rotors in coal-fired power plants face problems such as immobility, high rotational resistance, and inability to be manually turned. Furthermore, such equipment is typically not equipped with dedicated easing drive devices. Therefore, using the aforementioned methods to check the sway of problematic components is extremely difficult. Summary of the Invention

[0006] This invention addresses the problem that conventional runout measurement of large rotating machinery such as power plant wind turbines, wind turbine generator sets, and steam turbine rotors cannot be performed through turning, moving, and slow-motion operations. It proposes a tool and method for measuring the runout of the end face of large rotating equipment.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: A measuring tool for the off-end face of a large rotating equipment includes an upper mounting ring, a lower mounting ring, a guide rail adapter ring, a slider guide rail ring, a guide rail baffle, a universal joint mounting slider, a universal swing arm, and a dial indicator. The upper and lower mounting rings are fitted onto the shaft of the device under test, and the upper and lower mounting rings are connected together by fasteners. The slider guide ring is connected to the upper mounting ring via a guide rail adapter ring. The upper mounting ring and the slider guide ring are provided with semi-circular flange edges for fixing the guide rail adapter ring. The universal joint mounts the slider and connects to the slider guide ring. The guide rail baffle is installed at the end of the slider guide ring. One end of the universal joint arm is connected to the universal joint mounting slider, and the other end is connected to a dial indicator.

[0008] A further improvement of the present invention is that the upper mounting ring is semi-circular, and a semi-circular flange edge with semi-circular distribution flange holes is welded on the outside. The distribution circle of the semi-circular flange holes is concentric with the inner ring surface of the mounting ring. The reference dimension of the inner ring is consistent with the shaft of the device being measured. Transition fit tolerance is adopted during processing. Upper mounting ring lugs with through holes are welded at both ends of the upper mounting ring, and the lug length is 30mm.

[0009] A further improvement of the present invention is that the inner ring size of the lower mounting ring is consistent with the shaft of the device being measured, negative tolerance is adopted during processing, and lower mounting ring lugs with through holes are welded to both ends of the lower mounting ring. The length of the lugs and the position of the openings are consistent with those of the upper mounting ring lugs.

[0010] A further improvement of the present invention is that the upper mounting ring and the lower mounting ring are connected by bolts through through holes on the upper mounting ring lugs and the lower mounting ring lugs, and the thickness of the upper mounting ring... t 1 is at least the thickness of the lower mounting ring. t More than twice as much as 2.

[0011] A further improvement of the present invention is that the slider guide ring includes a guide rail, a transition flange hole, and a transition flange; The adapter flange is semi-circular with an inner diameter of [missing information]. D n Greater than the radius of the pivot D s The distribution circle of the transition flange holes is semi-circular, the opening angle of the transition flange holes is consistent with that of the guide rail transition ring, the guide rail is arc-shaped with an angle greater than 180°, and the center of the guide rail arc, the center of the distribution circle of the transition flange holes and the center of the rotating shaft coincide. The guide rail has a V-shaped groove on both sides and is made of tin bronze or nylon. Threaded holes are opened at both ends of the guide rail for installing guide rail baffles.

[0012] A further improvement of the present invention is that the universal joint mounting slider is connected to the slider guide ring, and the part of the universal joint mounting slider that contacts the guide ring is made of tin bronze or nylon so as to allow it to slide freely on the slider guide ring.

[0013] A further improvement of the present invention is that the universal joint is a universal joint for magnetic gauge base, which is connected to the universal joint mounting slider by a tail bolt, and a universal dial indicator or micrometer is mounted on the head of the universal joint.

[0014] A further improvement of this invention is that the upper and lower mounting rings can be individually machined according to the actual shaft diameter of the device being measured, while the remaining components are suitable for all shaft diameters smaller than the inner diameter of the slider guide ring flange. D n The device axis.

[0015] A method for measuring the off-center end face pendulum of a large rotating equipment, the method being based on the aforementioned measuring tool for the off-center end face pendulum of a large rotating equipment, comprising: First, clean the dirt from the surface of the shaft of the device under test. Then, install the upper and lower mounting rings on the shaft of the device under test and tighten them with fasteners. Install the universal joint mounting slider into the slider guide ring, and then install the guide rail baffles at both ends of the slider guide ring; connect the slider guide ring and the upper mounting ring flange through the guide rail adapter ring; finally, install the universal joint onto the universal joint slider, and install the dial indicator or micrometer indicator onto the universal joint head.

[0016] A further improvement of this invention is that, during measurement, the dial indicator head is first adjusted to the top position of the rotating shaft, and the dial indicator is zeroed. The slider is then moved to read the dial indicator readings on both sides at a 45° angle above the rotating shaft. L 11 and L 12 Read the percentage readings on both sides of the horizontal position of the rotating shaft. L 21 and L 22 ; The runout readings of the test piece at a 45° angle below and directly below. L 31 , L 32 and L 4. Calculate using equations (1), (2), and (3) respectively; L 31 =3× L 12 - L 21 - L 22 (1) L 32 =3× L 11 - L 21 - L 22 (2) L 4= L 21 + L 22 (3) This completes the end face runout test of the shaft assembly of the tested equipment.

[0017] Compared with the prior art, the present invention has at least the following beneficial technical effects: This invention eliminates the need for full rotation or movement of the machine being measured during implementation. Instead, the slider structure slides along the guide ring, causing the magnetic gauge head to move half a revolution across the end face being measured. This effectively solves problems such as the difficulty of rotating large machinery.

[0018] Furthermore, during installation, the present invention uses upper and lower mounting rings to securely hold the surface of the shaft being measured, eliminating the need for magnetic fixation to the surface of the shaft using a magnetic base as in existing technologies. Therefore, it is applicable to various robust, non-magnetic round shaft objects. Attached Figure Description

[0019] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present invention.

[0021] Figure 2 This is a schematic diagram showing the installation and dimensional relationship between the upper and lower mounting rings and the shaft of the device under test in this invention.

[0022] Figure 3 This is a schematic diagram showing the relationship between the opening size of the annular guide rail and the size of the measured shaft in an embodiment of the present invention.

[0023] Figure 4 This is a schematic diagram illustrating how the present invention is used in an embodiment.

[0024] Figure 5 This is a diagram illustrating the measurement parameters of an embodiment of the present invention.

[0025] Explanation of reference numerals in the attached figures: 1. Shaft of the device under test; 2. Upper mounting ring; 201. Flange hole distribution circle; 202. Inner ring surface of the mounting ring; 203. Upper mounting ring lug; 3. Guide rail adapter ring; 4. Lower mounting ring; 401. Lower mounting ring lug; 5. Slider guide rail ring; 501. Guide rail; 502. Adapter flange hole; 503. Adapter flange; 6. Guide rail baffle; 7. Universal joint mounting slider; 8. Universal joint; 9. Dial indicator; 10. Structure under test; 11. Top position of the shaft; 12. 45° angled upward position of the shaft; 13. Horizontal position of the shaft. Detailed Implementation

[0026] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of the invention. Therefore, the drawings and description are considered to be exemplary in nature and not restrictive.

[0027] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0028] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0029] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0030] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0031] It should be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the invention. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0032] It should also be further understood that the term "and / or" as used in this specification and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0033] The accompanying drawings illustrate various structural schematic diagrams according to embodiments disclosed in this invention. These drawings are not to scale, and some details have been enlarged for clarity, and some details may have been omitted. The shapes of the various regions and layers shown in the drawings, as well as their relative sizes and positional relationships, are merely exemplary and may deviate from reality due to manufacturing tolerances or technical limitations. Furthermore, those skilled in the art can design regions / layers with different shapes, sizes, and relative positions as needed.

[0034] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0035] Example 1 This invention provides a measuring tool for the end face sway of large rotating equipment. For large rotating machinery that does not have the conditions for slowing down and turning, it uses a slide rail and slider structure to replace the dial indicator and follow the turning, thereby realizing the auxiliary measurement of the end face sway phenomenon of rotating machinery.

[0036] like Figure 1 The diagram shown is a schematic diagram of the overall structure of the present invention. The present invention provides a measuring tool for the offset end face of a large rotating device, which consists of an upper mounting ring 2, a lower mounting ring 4, a guide rail adapter ring 3, a slider guide rail ring 5, a guide rail baffle 6, a universal joint mounting slider 7, a universal swing arm 8, and a dial indicator 9.

[0037] The upper mounting ring 2 and the lower mounting ring 4 are fitted onto the shaft 1 of the device under test, and are connected together by fasteners. The slider guide ring 5 is connected to the upper mounting ring 2 through the guide rail adapter ring 3. The upper mounting ring 2 and the slider guide ring 5 are provided with semi-circular flange edges for fixing the guide rail adapter ring 3. The universal joint mounting slider 7 is connected to the slider guide ring 5, and the guide rail baffle 6 is installed at the end of the slider guide ring 5. One end of the universal swing arm 8 is connected to the universal joint mounting slider 7, and the other end is connected to a dial indicator 9.

[0038] In this embodiment, the upper mounting ring 2 is semi-circular, with a semi-circular flange edge welded to its outer side, featuring semi-circular distribution flange holes. The distribution circle 201 of the semi-circular flange holes is concentric with the inner ring surface 202 of the mounting ring. The reference dimension of the inner ring is consistent with the shaft 1 of the device under test, and a transition fit tolerance is adopted during machining. Upper mounting ring lugs 203 with through holes are welded to both ends of the upper mounting ring, with a lug length of 30mm.

[0039] In this embodiment, the inner ring size of the lower mounting ring 4 is consistent with the shaft 1 of the device under test. Negative tolerance is adopted during processing. The lower mounting ring lugs 401 with through holes are welded to both ends of the lower mounting ring. The length of the lugs and the position of the openings are consistent with those of the upper mounting ring lugs 203.

[0040] In this embodiment, the upper mounting ring 2 and the lower mounting ring 4 are connected by bolts through through holes in the upper mounting ring lug 203 and the lower mounting ring lug 401. The thickness of the upper mounting ring... t 1. At least 4mm thick for the lower mounting ring. t More than twice as much as 2.

[0041] In this embodiment, the slider guide ring 5 and the upper mounting ring 2 are connected by a guide rail adapter ring 3. The upper mounting ring 2 and the slider guide ring 5 are provided with semi-circular flange edges for fixing the guide rail adapter ring 3. The slider guide ring 5 consists of three parts: a guide rail 501, an adapter flange hole 502, and an adapter flange 503. The adapter flange 503 is semi-circular with an inner diameter of... D n Greater than the radius of the pivot D s The distribution circle of the transition flange hole 502 is semi-circular, and the opening angle of the transition flange hole is consistent with that of the guide rail transition ring 3. The guide rail 501 is an arc with an angle greater than 180°, and the center of the arc of the guide rail 501, the center of the distribution circle of the transition flange hole 502, and the axis of rotation coincide. The cross-section of the guide rail 501 is a V-shaped groove on both sides, made of tin bronze or nylon. The guide rail 501 has threaded holes at both ends for installing the guide rail baffle 6.

[0042] In this embodiment, the universal joint mounting slider 7 is connected to the slider guide ring 5. The part of the universal joint mounting slider 7 that contacts the guide rail 501 is made of tin bronze or nylon so that it can slide freely on the slider guide ring 5.

[0043] In this embodiment, the universal joint 8 is a universal joint for magnetic gauge base, which is connected to the universal joint mounting slider 7 by a tail bolt, and a universal dial indicator or micrometer is mounted on the head of the universal joint.

[0044] In this embodiment, the upper mounting ring 2 and the lower mounting ring 4 need to be machined separately according to the actual shaft diameter of the device being tested. The remaining components are suitable for all shaft diameters smaller than the inner diameter of the flange of the slider guide ring 5. D n The device axis.

[0045] Example 2 This invention provides a method for measuring the pendulum swing of a large rotating device at its off-center end face, comprising: First, clean the surface of shaft 1 of the device under test to remove dirt, then... Figure 2 As shown, the upper mounting ring 2 and the lower mounting ring 4 are installed on the shaft of the device under test. The upper mounting ring lug 203 and the lower mounting ring lug 401 are connected and locked by bolts.

[0046] Apply grease to guide rail 501, install universal joint mounting slider 7 into guide rail 501, and then install guide rail baffles 6 at both ends of guide rail 501. Connect slider guide rail ring 5 and upper mounting ring 2 flange through guide rail adapter ring 3. Finally, install universal joint 8 onto universal joint slider 7, and install dial indicator 9 or micrometer indicator onto the head of universal joint 8.

[0047] In this embodiment, as Figure 4 As shown, during use, first adjust the dial indicator head to position 11 at the top of the shaft, and then zero the dial indicator. Figure 5 middle L 0=0, move slider 7 along guide rail 501, and read the percentage readings on both sides of position 12 at 45° above the rotating shaft. L 11 and L 12 Read the percentage values ​​on both sides of position 13 at the horizontal position of the rotating shaft. L 21 and L 22 .

[0048] like Figure 5 As shown, the runout readings of the measured piece are at a 45° angle below and directly below. L 31 , L 32 and L 4. Calculate using equations (1), (2), and (3) respectively.

[0049] L 31 =3× L 12 - L 21 - L 22 (1) L 32 =3× L 11 - L 21 - L 22 (2) L 4= L 21 + L 22 (3) This completes the end face runout test of the shaft assembly of the device under test based on the present invention.

[0050] Example 3 The following illustrates a scenario where the perpendicularity of a shaft system to be tested and its support is measured using the present invention: During the preparation phase, machine the upper and lower mounting rings as required, with dimensions slightly smaller than the measured shaft, and equip them with flange holes matching the dimensions of the guide rail adapter ring's tail flange. Follow the aforementioned operating steps and attached... Figure 1 The overall structure is connected and installed on the shaft being measured. The adjusting slider is approximately located in the middle of the guide rail. The universal joint is adjusted until the dial indicator head abuts against its support. The selected position of the dial indicator head ensures that the slider moves along the guide rail through a precision-machined structure, which in this embodiment is the exposed bearing outer ring bushing structure.

[0051] Further adjust the universal joint until the dial indicator is at the top of the selected movement trajectory, and clear the indicator reading to zero. Lock the universal joint, move the slider 90° to the left and record the reading as 0.2mm, then move the slider in the opposite direction and record the reading as 0.05mm. Calculations using equations (1) to (3) show that the support has a runout. The left side is closer to the installation position of the measuring tool, and the right side is farther from the installation position of the measuring tool, with an offset of 0.15mm on the measuring plane. The lower side is closer to the installation position of the measuring tool, and the upper side is farther from the installation position of the measuring tool, with an offset of 0.25mm. This application example is used for measuring the runout of the support, so a 45° angled measurement is not required.

[0052] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the scope of the invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0053] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can be appropriately combined to form other embodiments that can be understood by those skilled in the art. The above content is only for illustrating the technical concept of the present invention and should not be construed as limiting the scope of protection of the present invention. Any modifications made based on the technical concept proposed in this invention shall fall within the scope of protection of the claims of this invention.

Claims

1. A measuring tool for the off-end face of a large rotating device, characterized in that, Includes upper mounting ring (2), lower mounting ring (4), guide rail adapter ring (3), slider guide rail ring (5), guide rail baffle (6), universal joint mounting slider (7), universal swing arm (8) and dial indicator (9); The upper mounting ring (2) and the lower mounting ring (4) are fitted onto the shaft (1) of the device under test, and the upper mounting ring (2) and the lower mounting ring (4) are connected together by fasteners; The slider guide ring (5) is connected to the upper mounting ring (2) through the guide rail adapter ring (3). The upper mounting ring (2) and the slider guide ring (5) are provided with semi-circular flange edges for fixing the guide rail adapter ring (3). The universal joint mounting slider (7) is connected to the slider guide ring (5). The guide rail baffle (6) is installed at the end of the slider guide ring (5). One end of the universal arm (8) is connected to the universal joint mounting slider (7), and the other end is connected to a dial indicator (9).

2. The measuring tool for the off-end face of a large rotating device according to claim 1, characterized in that, The upper mounting ring (2) is semi-circular, with a semi-circular flange edge with semi-circular distribution flange holes welded on the outside. The semi-circular flange hole distribution circle (201) is concentric with the inner ring surface (202) of the mounting ring. The inner ring reference dimension is consistent with the shaft (1) of the equipment being measured. Transition fit tolerance is adopted during processing. Upper mounting ring lugs (203) with through holes are welded at both ends of the upper mounting ring (2). The lug length is 30mm.

3. The measuring tool for the off-center end face of a large rotating device according to claim 2, characterized in that, The inner ring size of the lower mounting ring (4) is consistent with the shaft (1) of the device under test. Negative tolerance is adopted during processing. The lower mounting ring lugs (401) with through holes are welded to both ends of the lower mounting ring. The length of the lugs and the position of the opening are consistent with the upper mounting ring lugs (203).

4. The measuring tool for the off-end face of a large rotating device according to claim 3, characterized in that, The upper mounting ring (2) and the lower mounting ring (4) are connected by bolts through the through holes on the upper mounting ring lug (203) and the lower mounting ring lug (401). The thickness of the upper mounting ring is... t 1. At least the thickness of the lower mounting ring (4) t More than twice as much as 2.

5. A measuring tool for the off-center end face of a large rotating device according to claim 1, characterized in that, The slider guide ring (5) includes a guide rail (501), a transition flange hole (502), and a transition flange (503). The adapter flange (503) is semi-circular with an inner diameter of... D n Greater than the radius of the pivot D s The distribution circle of the transition flange hole (502) is semi-circular, the opening angle of the transition flange hole is consistent with that of the guide rail transition ring (3), the guide rail (501) is arc-shaped with an angle greater than 180°, and the center of the arc of the guide rail (501), the center of the distribution circle of the transition flange hole (502) coincides with the center of the rotating shaft. The guide rail (501) has a V-shaped groove on both sides and is made of tin bronze or nylon. The guide rail (501) has threaded holes at both ends for installing guide rail baffles (6).

6. A measuring tool for the off-center end face of a large rotating device according to claim 5, characterized in that, The universal joint mounting slider (7) is connected to the slider guide ring (5). The part of the universal joint mounting slider (7) that contacts the guide rail (501) is made of tin bronze or nylon so that it can slide freely on the slider guide ring (5).

7. A measuring tool for the off-center end face of a large rotating device according to claim 1, characterized in that, The universal joint (8) is a universal joint for magnetic gauge bases. It is connected to the universal joint mounting slider (7) by a tail bolt. A universal dial indicator (9) or micrometer is mounted on the head of the universal joint (8).

8. A measuring tool for the off-center end face of a large rotating device according to claim 1, characterized in that, The upper mounting ring (2) and lower mounting ring (4) can be individually machined according to the actual shaft diameter of the equipment being measured. The remaining components are suitable for all shaft diameters smaller than the inner diameter of the sliding guide ring (5) flange. D n The device axis.

9. A method for measuring the pendulum at the off-end face of a large rotating device, characterized in that, This method is based on a large rotating equipment off-center end face measuring tool according to any one of claims 1 to 8, comprising: First, clean the dirt on the surface of the shaft (1) of the device under test. Then, install the upper mounting ring (2) and the lower mounting ring (4) on the shaft of the device under test and lock them with fasteners. Install the universal joint mounting slider (7) into the slider guide ring (5), and then install the guide rail baffles (6) at both ends of the slider guide ring (5); connect the slider guide ring (5) and the upper mounting ring (2) flange through the guide rail adapter ring (3); finally, install the universal joint (8) onto the universal joint slider (7), and install the dial indicator (9) or micrometer onto the head of the universal joint (8).

10. A method for measuring the pendulum of a large rotating device at its off-center end face according to claim 9, characterized in that, During measurement, first adjust the dial indicator head to the top position of the rotating shaft (11), and zero the dial indicator. Move the slider (7) and read the dial indicator readings on both sides at the 45° angle above the rotating shaft (12). L 11 and L 12 Read the percentage values ​​on both sides of the horizontal position (13) of the rotating shaft. L 21 and L 22 ; The runout readings of the test piece at a 45° angle below and directly below. L 31 , L 32 and L 4. Calculate using equations (1), (2), and (3) respectively; L 31 =3× L 12 - L 21 - L 22 （1） L 32 =3× L 11 - L 21 - L 22 （2） L 4= L 21 + L 22 （3） This completes the end face runout test of the shaft assembly of the tested equipment.

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