Tool for measuring roundness of rotor

Abstract

The utility model provides a tool for measuring roundness of a rotor. The tool comprises a rotating structure, a connecting structure and a distance measuring structure which are connected in sequence, the rotating structure is located on the shaft end face of a to-be-measured rotor, one end of the connecting structure is connected with the output end of the rotating structure, the other end of the connecting structure is connected with the distance measuring structure, and the distance measuring structure is arranged towards the side wall of the to-be-measured rotor; the rotating structure is used for driving the connecting structure to rotate around the to-be-tested rotor, and the distance measuring structure rotates along with the connecting structure so as to test the distances between different positions of the side wall of the to-be-tested rotor and the distance measuring structure, so that the roundness of the to-be-tested rotor is obtained. The process of measuring the roundness of the to-be-measured rotor is simple and convenient, the measurement efficiency can be remarkably improved, and the measurement precision can be remarkably improved through automatic distance measurement of the distance measurement structure.

Description

Technical Field

[0001] The utility model relates to the technical field of measurement, in particular to a tool for measuring the roundness of a rotor. Background Art

[0002] Currently, when measuring the roundness of a rotor, a rotor roundness measuring stand and a displacement dial indicator are usually used together. The dial indicator is installed at 3-4 measuring points on the vertical longitudinal arm at the front of the roundness measuring stand. The maintenance worker pushes the roundness measuring stand to rotate and stops to take readings when it reaches the corresponding measuring point.

[0003] This measurement method requires a lot of material and manpower, and has low measurement accuracy and efficiency. Utility Model Content

[0004] In view of this, the purpose of the present invention is to provide a tool for measuring the roundness of a rotor, so as to solve the problem of low efficiency in measuring the roundness of a rotor.

[0005] Based on the above purpose, the utility model provides a tool for measuring the roundness of a rotor, comprising a rotating structure, a connecting structure and a distance measuring structure connected in sequence;

[0006] The rotating structure is located on the axial end face of the rotor to be measured, one end of the connecting structure is connected to the output end of the rotating structure, and the other end is connected to the distance measuring structure, and the distance measuring structure is arranged toward the side wall of the rotor to be measured;

[0007] The rotating structure is used to drive the connecting structure to rotate around the rotor to be measured. The distance measuring structure rotates with the connecting structure to measure the distance between different positions of the side wall of the rotor to be measured and the distance measuring structure to obtain the roundness of the rotor to be measured.

[0008] Furthermore, the tool further comprises a lifting structure, wherein the lifting structure is located on the axial end face of the rotor to be measured, and the rotating structure is connected to the rotor to be measured via the lifting structure.

[0009] Furthermore, the lifting structure is an electrically controlled lifting platform.

[0010] Furthermore, the connecting structure includes a connecting horizontal arm and a connecting vertical arm connected in sequence, the free end of the connecting horizontal arm is connected to the output end of the rotating structure, and the free end of the connecting vertical arm is connected to the ranging structure.

[0011] Furthermore, the connecting vertical arm is a telescopic sleeve, the fixed end of the telescopic sleeve is connected to the connecting horizontal arm, and the telescopic end is a free end connected to the ranging structure.

[0012] Furthermore, the connecting structure is a connecting oblique arm, which is a telescopic structure, a fixed end of which is connected to the output end of the rotating structure, and a telescopic end of which is connected to the ranging structure, and the fixed end is set higher than the telescopic end.

[0013] Furthermore, the distance measuring structure is an infrared distance measuring sensor or an ultrasonic distance measuring device.

[0014] Furthermore, the tool also includes a controller, and the rotating structure and the ranging structure are both electrically connected to the controller.

[0015] As can be seen from the above, the utility model provides a tool for measuring the roundness of a rotor, which connects a rotating structure and a distance measuring structure through a connecting structure. The rotating structure drives the distance measuring structure to rotate around the outer periphery of the side wall of the rotor to be measured, so that the distance measuring structure measures the distance between the side wall of the rotor to be measured and the distance measuring structure at the same height. Based on the change in this distance, the roundness of the rotor to be measured at this height is obtained. In actual use, the height of the distance measuring structure can be adjusted by adjusting the connecting structure to measure the roundness of the rotor to be measured at different heights, thereby achieving the goal of measuring the overall roundness of the rotor to be measured. The process of measuring the roundness of the rotor to be measured by this application is simple and can significantly improve measurement efficiency. The automatic distance measurement of the distance measuring structure can also significantly improve measurement accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0017] Figure 1 This is a schematic diagram of the structure of a tool for measuring the roundness of a rotor according to an embodiment of the present utility model.

[0018] In the figure: 10, rotating structure; 20, connecting structure; 21, connecting horizontal arm; 22, connecting vertical arm; 30, ranging structure; 40, rotor to be measured. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0020] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present invention should have the usual meanings understood by people with ordinary skills in the field to which this application belongs. The "first", "second" and similar words used in this application do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative position relationships. When the absolute position of the described object changes, the relative position relationship may also change accordingly.

[0021] The roundness of the rotor is related to the electromagnetic force balance during the operation of the generator set. The roundness of the rotor directly affects the stability of the unit operation. Therefore, high requirements are placed on the roundness accuracy of the rotor in the generator design.

[0022] As described in the background, rotor roundness is currently measured using a rotor roundness measuring stand and a displacement dial indicator. Three to four measuring points are selected on the vertical longitudinal arm at the front of the roundness measuring stand, and the dial indicator is installed. A maintenance worker rotates the roundness measuring stand, stopping at the corresponding measuring point to read the dial indicator value. The roundness measuring stand is typically a large, heavy, welded angle steel truss structure, making it time-consuming and labor-intensive to place on the rotor. The longitudinal arm measuring rod is prone to deformation and must stop at each magnetic pole during measurement, resulting in large swings and inaccurate stop positions. This leads to large reading errors and makes it impossible to accurately measure the value. This method also requires the operator to read the readings, which also results in certain deviations. Overall, this current measurement method requires significant material and human resources, resulting in low efficiency. To address this issue, improvements to rotor roundness measurement methods are necessary.

[0023] Based on this, the present application proposes a tool for measuring rotor roundness to improve the efficiency and accuracy of rotor roundness measurement.

[0024] The present application is described in detail below through one or more specific embodiments.

[0025] In some embodiments, a tool for measuring rotor roundness, such as Figure 1 As shown, it includes a rotating structure 10, a connecting structure 20 and a ranging structure 30 connected in sequence;

[0026] The rotating structure 10 is located on the axial end surface of the rotor to be measured 40. One end of the connecting structure 20 is connected to the output end of the rotating structure 10, and the other end is connected to the distance measuring structure 30. The distance measuring structure 30 is arranged toward the side wall of the rotor to be measured 40.

[0027] The rotating structure 10 is used to drive the connecting structure 20 to rotate around the rotor 40 to be tested. The distance measuring structure 30 rotates with the connecting structure 20 to measure the distance between different positions of the side wall of the rotor 40 to be tested and the distance measuring structure 30 to obtain the roundness of the rotor 40 to be tested.

[0028] Specifically, the rotating structure 10 is located on the axial end surface of the rotor 40 to be measured (i.e., on the top or bottom surface of the rotor 40 to be measured). The rotor 40 to be measured is capable of rotating about this axis. The distance measuring structure 30 is then configured to rotate about this axis to measure the roundness of the rotor 40 to be measured. The output end of the rotating structure 10 is capable of outputting rotational motion about this axis. The connecting structure 20 is connected to the output end of the rotating structure 10 to rotate therewith. Accordingly, the distance measuring structure 30, driven by the connecting structure 20 and the rotating structure 10, rotates about the sidewall of the rotor 40 to be measured. When the output end of the rotating structure 10 rotates one full rotation (i.e., 360°), the distance measuring structure 30 also rotates one full rotation about the sidewall of the rotor 40 to be measured.

[0029] The distance measuring structure 30 measures the linear distance between itself and the corresponding side wall of the rotor 40 to be measured during the process of rotating with the rotating structure 10 , and the roundness of the rotor 40 to be measured is obtained through the linear distance.

[0030] If the roundness of the rotor 40 to be measured is high, the distance measured by the distance measuring structure 30 during one rotation around the rotor 40 to be measured will have a small difference; if the roundness of the rotor 40 to be measured is low, the distance measured by the distance measuring structure 30 during one rotation around the rotor 40 to be measured will have a large difference.

[0031] It should be noted that the rotating structure 10 performs uniform circular motion during rotation to meet the need of the distance measuring structure 30 to measure distance during rotation. The measurement result of the distance measuring structure 30 is output as a line graph with time as the horizontal coordinate and distance as the vertical coordinate. When the line segment of the generated line graph is relatively flat, the roundness of the rotor 40 to be measured is higher. When the line segment of the generated line graph is relatively curved, the roundness of the rotor 40 to be measured is lower.

[0032] In addition, the rotor 40 to be measured is composed of multiple magnetic pole structures, and there is a gap between two adjacent magnetic pole structures. Therefore, when the distance measuring structure 30 rotates around the rotor 40 to be measured, the measured distance may suddenly increase significantly. When measuring the roundness of the rotor 40 to be measured, the value of the measured distance increase is not taken into account.

[0033] In this embodiment, the rotating structure 10 and the distance measuring structure 30 are connected by a connecting structure 20. The rotating structure 10 drives the distance measuring structure 30 to rotate around the side wall of the rotor 40 to be measured, so that the distance measuring structure 30 measures the distance between the side wall of the rotor 40 to be measured and the distance measuring structure 30 at the same height. Based on the change in this distance, the roundness of the rotor 40 to be measured at that height is obtained. In actual use, the height of the distance measuring structure 30 can be adjusted by adjusting the connecting structure 20 to measure the roundness of the rotor 40 to be measured at different heights, thereby achieving the goal of measuring the overall roundness of the rotor 40 to be measured. The process of measuring the roundness of the rotor 40 to be measured is simple and can significantly improve measurement efficiency. The automatic distance measurement of the distance measuring structure 30 can also significantly improve measurement accuracy.

[0034] In some embodiments, the tool further includes a lifting structure, which is located on the axial end surface of the rotor to be measured 40 , and the rotating structure 10 is connected to the rotor to be measured 40 via the lifting structure.

[0035] Specifically, the rotating structure 10 is connected to the axial end surface of the rotor to be measured 40 through the lifting structure, so that the rotating structure 10 can be lifted and lowered along with the lifting structure. Correspondingly, the connecting structure 20 and the distance measuring structure 30 are lifted and lowered along with the rotating structure 10. During the lifting process, the distance measuring structure 30 is opposite to the side walls of the rotor to be measured 40 at different heights, that is, it can measure the roundness of the rotor to be measured 40 at different heights. The tool can adjust the measuring position of the distance measuring structure 30 by adjusting the lifting structure, thereby improving the practicality of the tool.

[0036] In some embodiments, the lifting structure is an electrically controlled lifting platform.

[0037] Specifically, the lifting structure is an electrically controlled lifting platform, that is, the lifting structure can be lifted and lowered through electrical signals, thereby avoiding user operation, improving the ease of use of the tool, improving the measurement efficiency of the tool, and being beneficial to the practicality and promotion and application of the tool.

[0038] In some embodiments, as Figure 1 As shown, the connecting structure 20 includes a connecting horizontal arm 21 and a connecting vertical arm 22 connected in sequence, the free end of the connecting horizontal arm 21 is connected to the output end of the rotating structure 10, and the free end of the connecting vertical arm 22 is connected to the ranging structure 30.

[0039] Specifically, the function of the connecting structure 20 is to connect the rotating structure 10 and the ranging structure 30 together. The ranging structure 30 is arranged opposite to the side wall of the rotor to be measured 40. The rotating structure 10 is located on the end face of the rotor to be measured 40. The connecting cross arm 21 is provided to connect to the rotating structure 10. The connecting cross arm 21 is provided to protrude relative to the side wall of the rotor to be measured 40. The connecting vertical arm 22 is connected to the free end of the connecting cross arm 21 so as to rotate with the rotating structure 10 through the connecting cross arm 21. The connecting vertical arm 22 is used to connect the ranging structure 30, so that the ranging structure 30 is arranged opposite to the side wall of the rotor to be measured 40.

[0040] The connecting horizontal arm 21 and the connecting vertical arm 22 have simple structures and are easy to set up. They can be lightweight structures with high rigidity, which are easy to install and can greatly improve measurement efficiency.

[0041] In some embodiments, the connecting vertical arm 22 is a telescopic sleeve, the fixed end of the telescopic sleeve is connected to the connecting horizontal arm 21 , and the telescopic end is a free end connected to the ranging structure 30 .

[0042] Specifically, the connecting vertical arm 22 is a telescopic sleeve, and the distance measuring structure 30 is connected to the telescopic end of the telescopic sleeve so as to extend and retract with the telescopic sleeve to measure the side walls of the rotor 40 to be measured at different heights. This can not only meet the use requirements of the tool, but also facilitate user operation, which is conducive to improving measurement efficiency and enhancing the practicality of the tool.

[0043] It should be noted that the telescopic sleeve is used in conjunction with a tightening bolt. When the telescopic sleeve is extended to a corresponding position, the tightening bolt passes through a side wall of the telescopic sleeve and tightens against the sleeve located therein, so that the length of the telescopic sleeve is fixed.

[0044] In some embodiments, the connecting structure 20 is a connecting oblique arm, which is a retractable structure, a fixed end of which is connected to the output end of the rotating structure 10, and a retractable end of which is connected to the ranging structure 30, and the fixed end is set higher than the retractable end.

[0045] Specifically, the rotating structure 10 is located at the top of the rotor to be measured 40, that is, connected to the top axial end surface of the rotor to be measured 40. In this way, the fixed end of the connecting oblique arm is set higher than the telescopic end, so that the telescopic end can be extended and retracted to drive the distance measuring structure 30 toward the side walls of the rotor to be measured 40 at different heights, thereby being able to measure the roundness of the rotor to be measured 40 at different heights.

[0046] When the connecting oblique arm is extended or retracted, its retractable end moves, and accordingly, the distance measuring structure 30 located on the retractable end moves accordingly. The connecting oblique arm is arranged at an angle, and its fixed end is higher. Therefore, when the connecting oblique arm is extended, the distance between the distance measuring structure 30 and the side wall of the rotor 40 to be measured increases, and the height of the distance measuring structure 30 decreases. Accordingly, the height of the side wall of the rotor 40 to be measured, which is directed toward and measured by the distance measuring structure 30, decreases. By adjusting the extension or retraction of the connecting oblique arm, the roundness of the rotor 40 to be measured at different heights can be measured, which simplifies the measurement process and is conducive to improving the practicality and popularization and applicability of the tool.

[0047] In some embodiments, the distance measuring structure 30 is an infrared distance measuring sensor or an ultrasonic distance measuring device.

[0048] Specifically, the distance measuring structure 30 is used to automatically measure the distance between the object it is facing and the object. By measuring the distance between the side wall of the rotor 40 to be measured and the object, the purpose of measuring the roundness of the rotor 40 to be measured is achieved. By comparing the uniformity of the distance between the side wall of the rotor 40 to be measured and the distance measuring structure 30, the roundness of the rotor 40 to be measured can be determined.

[0049] Both the infrared ranging sensor and the ultrasonic ranging device are electrically controlled automatic ranging structures 30. Setting the ranging structure 30 as an infrared ranging sensor or an ultrasonic ranging device can be linked with the rotating structure 10. The user only needs to operate once to control the rotating structure 10 and the ranging structure 30 to run synchronously, greatly improving measurement efficiency.

[0050] In some embodiments, the tool further includes a controller, and the rotating structure 10 and the ranging structure 30 are both electrically connected to the controller.

[0051] Specifically, the controller is used to control the operation of the rotating structure 10 and the ranging structure 30. The controller can link the rotating structure 10 and the ranging structure 30 together, that is, when the controller controls the rotating structure 10 to operate, the ranging structure 30 automatically operates, and when the controller controls the ranging structure 30 to operate, the rotating structure 10 automatically operates. The setting of the controller can improve the practicality of the tool and greatly improve the measurement accuracy and efficiency of the tool.

[0052] In addition, when the rotating structure 10 is connected to the axial end face of the rotor to be measured 40 through an electrically controlled lifting platform, the electrically controlled lifting platform, the rotating structure 10, and the distance measuring structure 30 are all connected to the controller. The height of the rotating structure 10 is controlled by the controller, and the height of the distance measuring structure 30 is further controlled, so that the distance measuring structure 30 measures the side walls of the rotor to be measured 40 at different heights, greatly improving the measurement efficiency of the tool.

[0053] Exemplarily, after the user installs the rotating structure 10, the connecting structure 20 and the ranging structure 30 on the rotor 40 to be measured, the user operates the controller to realize the simultaneous operation of the rotating structure 10 and the ranging structure 30, and the rotating structure 10 rotates at a fixed speed at a uniform speed, and the running trajectory of the rotating structure 10 is controlled to be 360°, that is, one circle. Accordingly, the ranging structure 30 runs for a corresponding time by default. The controller can automatically calculate the time for the rotating structure 10 to run one circle = 360° / V, where V is the rotation speed of the rotating structure 10. In this way, the ranging structure 30 can automatically measure the corresponding time. After the cycle motion ends, the controller can generate a measurement result of the ranging structure 30. The measurement result is that the ranging structure 30 measures the side wall roundness of the rotor 40 to be measured at a certain height. By adjusting the height of the ranging structure 30, the measurement work of the next cycle can be started to measure the side wall roundness of the rotor 40 to be measured at other heights.

[0054] Those skilled in the art should understand that the discussion of any of the above embodiments is merely illustrative and is not intended to imply that the scope of the present application (including the claims) is limited to these examples. Within the scope of the present invention, the technical features of the above embodiments or different embodiments may be combined, the steps may be implemented in any order, and there are many other variations of the different aspects of the present invention as described above, which are not provided in detail for the sake of simplicity.

[0055] The embodiments of the present invention are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A tool for measuring rotor roundness, characterized in that: It includes a rotating structure, a connecting structure and a distance measuring structure connected in sequence; The rotating structure is located on the axial end face of the rotor to be measured, one end of the connecting structure is connected to the output end of the rotating structure, and the other end is connected to the distance measuring structure, and the distance measuring structure is arranged toward the side wall of the rotor to be measured; The rotating structure is used to drive the connecting structure to rotate around the rotor to be measured. The distance measuring structure rotates with the connecting structure to measure the distance between different positions of the side wall of the rotor to be measured and the distance measuring structure to obtain the roundness of the rotor to be measured.

2. The tool for measuring rotor roundness according to claim 1, characterized in that: It also includes a lifting structure, which is located on the shaft end surface of the rotor to be measured, and the rotating structure is connected to the rotor to be measured through the lifting structure.

3. The tool for measuring rotor roundness according to claim 2, characterized in that: The lifting structure is an electrically controlled lifting platform.

4. The tool for measuring rotor roundness according to claim 1, characterized in that: The connecting structure includes a connecting horizontal arm and a connecting vertical arm connected in sequence, the free end of the connecting horizontal arm is connected to the output end of the rotating structure, and the free end of the connecting vertical arm is connected to the distance measuring structure.

5. The tool for measuring rotor roundness according to claim 4, characterized in that: The connecting vertical arm is a telescopic sleeve, the fixed end of the telescopic sleeve is connected to the connecting horizontal arm, and the telescopic end is a free end connected to the distance measuring structure.

6. The tool for measuring rotor roundness according to claim 1, characterized in that: The connecting structure is a connecting oblique arm, which is a telescopic structure. Its fixed end is connected to the output end of the rotating structure, and its telescopic end is connected to the ranging structure. The fixed end is arranged higher than the telescopic end.

7. The tool for measuring rotor roundness according to claim 1, characterized in that: The distance measuring structure is an infrared distance measuring sensor or an ultrasonic distance measuring device.

8. The tool for measuring rotor roundness according to claim 1, characterized in that: It also includes a controller, and the rotating structure and the distance measuring structure are both electrically connected to the controller.

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