Linear calibration table for axial displacement probe
By designing an axial displacement probe linear calibration bench that includes a rotating block, a screw, an extension block and a rubber sleeve, the existing technology's problems of reduced accuracy and inability to simultaneously calibrate multiple probes are solved, achieving efficient and accurate The probe linearity is calibrated and actual working conditions are simulated.
Patent Information
- Application Number
- CN202420988368.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-09
- Publication Date
- 2025-01-21
- Estimated Expiration
- 2034-05-09
AI Technical Summary
As the service life of the existing linear calibration table of the axial displacement probe gradually decreases, the accuracy of the existing linear calibration table of the axial displacement probe gradually decreases, and multiple probes cannot be checked at the same time, and the working conditions of the probe on the turbine rotor cannot be truly simulated, resulting in a long calibration time and low accuracy.
An axial displacement probe linear calibration bench including a base, a rotating block, a screw, an extension block, a bracket, a threaded sleeve, a rubber sleeve and a threaded rod is designed. Through the cooperation of the rotating block and the screw, it is fixed on the turbine cylinder. , using rubber sleeves and threaded sleeves to achieve simultaneous calibration of three probes, and simulating the linear displacement of the probes through extension blocks and threaded rods.
It realizes the linearity calibration of three probes at the same time, reduces the interference of uncontrollable factors on the calibration process, simulates the actual installation of the probe on the turbine rotor to the maximum extent, and improves the accuracy and efficiency of calibration.
Smart Images
Figure CN222378953U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of axial displacement probe calibration, in particular to an axial displacement probe linear calibration platform. Background Art
[0002] The axial displacement of the steam turbine is an important component of the TSI system. Its measuring probe generally adopts an eddy current sensor. It uses non-contact measurement and has high linearity and high resolution to measure the distance between the measured metal conductor and the probe surface. The reinstallation of the probe of the steam turbine TSI system is time-sensitive and the task is heavy. Before the installation of various displacement probes, they need to undergo multiple linear calibrations to ensure that the probe quality meets the requirements. Among them, the linear calibration of the axial displacement probe has no special base, so it can only use a portable displacement calibration table to calibrate the probe linearity, which wastes a lot of time and cannot simulate the actual working conditions. It has always been a thorny problem faced by thermal engineering professionals.
[0003] The existing axial displacement probe linear calibration bench is a portable calibration bench. During calibration, the scale is set at the zero point, the probe is placed in the V-groove, the probe position is adjusted to the zero voltage and fixed firmly, and the linearity of the axial displacement probe is verified by rotating the displacement screw to move the side and simulate the rotor movement.
[0004] Although the existing axial displacement probe linear calibration bench is easy to carry, its accuracy gradually decreases with the increase of years of use. When calibrating the full-stroke linearity of the axial displacement probe, it is necessary to calibrate the positive and negative alarm values and tripping values of the probe. However, the calibration bench can only calibrate one displacement probe at a time, which wastes a lot of time and affects the overall installation progress. The linear calibration process calculates the distance through the gap voltage between the probe and the side of the calibration bench. The material, thickness and smoothness of the side are completely different from those on site, and it is impossible to truly simulate the working conditions of the displacement probe on the rotor.
[0005] Therefore, in order to solve the above problems, an axial displacement probe linear calibration platform is proposed. Utility Model Content
[0006] The utility model aims to provide an axial displacement probe linear calibration platform to solve the problem that the accuracy of the axial displacement probe linear calibration platform in the prior art mentioned in the above background technology gradually decreases with the increase of service life, and it is necessary to calibrate the positive and negative direction alarm values and tripping values of the probe while performing full-stroke linear calibration of the axial displacement probe, but the calibration platform can only calibrate one displacement probe at a time, which wastes a lot of time and affects the overall installation progress; the linear calibration process calculates the distance through the gap voltage between the probe and the side surface of the calibration platform, and the material, thickness and smoothness of the side surface are completely different from those on site, and it is impossible to truly simulate the working condition of the displacement probe for the rotor.
[0007] To achieve the above object, the utility model provides the following technical solution: an axial displacement probe linear calibration platform, comprising: a base, a rotating block is installed on one side wall of the base, and a screw is integrally formed on the side wall of the rotating block;
[0008] An extension block is slidably installed inside the side wall of the base, and the top surface of the extension block is fixedly connected to the bracket by a fixing bolt. Three groups of threaded holes are opened on the upper end surface of the bracket, and the inner sides of the threaded holes are threadedly connected with threaded sleeves. A rotating ring is integrally formed at the front end of the threaded sleeve, and a rubber sleeve is bonded to the inner side of the threaded sleeve. A threaded rod is rotatably installed on the inner side of the base, and a rotating handle is fixedly connected to the front end of the threaded rod. An adjustment bolt is threadedly connected to the other side wall of the base, and a limit plate is provided on the middle part of the adjustment bolt.
[0009] Preferably, the adjusting bolt passes through the extension block, and the limiting plate is in contact with the side wall of the extension block.
[0010] Preferably, the threaded rod is threadably connected to the extension block.
[0011] Preferably, the rotating ring is located on the front side of the bracket.
[0012] Preferably, the rubber sleeve fits the axial displacement probe.
[0013] Compared with the prior art, the utility model has the following beneficial effects: the utility model can calibrate the linearity of three probes at the same time, fix the probe calibration table on site to simulate the actual working conditions to calibrate the linearity of the displacement probe to the turbine rotor, reduce the interference of other uncontrollable factors on the entire probe calibration process, simulate the actual installation conditions of the probe to the maximum extent, and ensure the accurate calibration effect of the probe.
[0014] The utility model is provided with a rotating block, and a rotating ring is rotated to screw the threaded sleeve into the threaded hole. The rotating block is rotated to cooperate with the screw rod, and the device can be fixed on the steam engine cylinder body to ensure the overall stability. Three axial displacement probes are installed on the inner side of the rubber sleeve, and the rubber sleeve can fix and protect the axial displacement probe. The axial displacement probe can be fixed on the bracket to ensure that the three axial displacement probes are aligned. The rotating handle is rotated to drive the threaded rod to rotate. The threaded rod is threadedly connected to the extension block to drive the extension block to move. When the position of the gap voltage zero point is found, the rotating handle is continued to be rotated to drive the extension block to move, and then the bracket is driven to move. The gap displacement between the three axial displacement probes and the measured surface changes. The rotating handle is continued to be rotated, and the entire calibration process can be completed according to the linear rule. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 It is a schematic diagram of the structure of the utility model;
[0016] Figure 2It is a schematic back view of the structure of the utility model;
[0017] Figure 3 It is a schematic side cross-sectional view of the structure of the threaded sleeve of the utility model.
[0018] In the figure: 1. base; 2. rotating block; 3. screw; 4. bracket; 5. fixing bolt; 6. threaded hole; 7. extension block; 8. rotating handle; 9. limit plate; 10. adjustment bolt; 11. threaded rod; 12. threaded sleeve; 13. rotating ring; 14. rubber sleeve. DETAILED DESCRIPTION
[0019] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0020] See also Figure 1-3 , an embodiment provided by the utility model:
[0021] The base 1, rotating block 2 and screw 3 used in the present application are products that can be directly purchased on the market. Their principles and connection methods are existing technologies well known to those skilled in the art, so they will not be described here in detail.
[0022] An axial displacement probe linear calibration platform comprises: a base 1, a rotating block 2 is mounted on one side wall of the base 1, and a screw 3 is integrally formed on the side wall of the rotating block 2;
[0023] An extension block 7 is slidably installed inside the side wall of the base 1, and the top surface of the extension block 7 is fixedly connected to the bracket 4 through a fixing bolt 5. Three groups of threaded holes 6 are opened on the upper end surface of the bracket 4, and a threaded sleeve 12 is threadedly connected to the inner side of the threaded hole 6. A rotating ring 13 is integrally formed at the front end of the threaded sleeve 12, and a rubber sleeve 14 is bonded to the inner side of the threaded sleeve 12. A threaded rod 11 is rotatably installed on the inner side of the base 1, and a rotating handle 8 is fixedly connected to the front end of the threaded rod 11. An adjusting bolt 10 is threadedly connected on the other side wall of the base 1, and a limiting plate 9 is sleeved on the middle part of the adjusting bolt 10. The three groups of threaded holes 6 provide positions for the installation of three groups of axial displacement probes, and the linearity of the three axial displacement probes can be verified at the same time. The probe verification bench is fixed on site to simulate the actual working conditions to verify the linearity of the displacement probe to the turbine rotor, reduce the interference of other uncontrollable factors on the entire probe verification process, simulate the actual installation situation of the probe to the maximum extent, and ensure the effect of accurate probe verification.
[0024] Furthermore, the adjusting bolt 10 passes through the extension block 7 , and the limiting plate 9 is fitted with the side wall of the extension block 7 . The extension block 7 can be fixed on the base 1 by the adjusting bolt 10 and the limiting plate 9 .
[0025] Furthermore, the threaded rod 11 is threadedly connected to the extension block 7 , and rotating the threaded rod 11 can drive the extension block 7 to move on the base 1 .
[0026] Furthermore, the rotating ring 13 is located at the front side of the bracket 4 , and the threaded sleeve 12 can be screwed out of the threaded hole 6 by rotating the rotating ring 13 .
[0027] Furthermore, the rubber sleeve 14 fits the axial displacement probe, and the rubber sleeve 14 can fix and protect the axial displacement probe, and can fix the axial displacement probe on the bracket 4.
[0028] Working principle: Before use, rotate the rotating ring 13 to screw the threaded sleeve 12 into the threaded hole 6;
[0029] When in use, the rotating block 2 is rotated to cooperate with the screw rod 3 to fix the device on the steam turbine cylinder body to ensure overall stability. The three axial displacement probes are installed on the inner side of the rubber sleeve 14. The rubber sleeve 14 can fix and protect the axial displacement probes. The axial displacement probes can be fixed on the bracket 4 to ensure that the three axial displacement probes are aligned.
[0030] Rotating the rotating handle 8 drives the threaded rod 11 to rotate. The threaded rod 11 is threadedly connected to the extension block 7, which can drive the extension block 7 to move. When the position of the zero point of the gap voltage is found, continue to rotate the rotating handle 8 to drive the extension block 7 to move, and then drive the bracket 4 to move. The gap displacement between the three axial displacement probes and the measured surface changes. Continue to rotate the rotating handle 8, and the entire calibration process can be completed according to the linear rule.
[0031] The above description is only a preferred embodiment of the utility model and does not limit the utility model in any form. Any ordinary technician in the industry can smoothly implement the utility model as shown in the drawings of the specification and described above. However, any equivalent changes, modifications and evolutions made by technicians familiar with the profession without departing from the scope of the technical solution of the utility model using the technical content disclosed above are all equivalent embodiments of the utility model. At the same time, any equivalent changes, modifications and evolutions made to the above embodiments based on the essential technology of the utility model are still within the protection scope of the technical solution of the utility model.
Claims
1. An axial displacement probe linear calibration platform, comprising: A base (1), a rotating block (2) being mounted on one side wall of the base (1), and a screw rod (3) being integrally formed on the side wall of the rotating block (2); Features: An extension block (7) is slidably mounted inside the side wall of the base (1); the top surface of the extension block (7) is fixedly connected to a bracket (4) via a fixing bolt (5); three groups of threaded holes (6) are provided on the upper end surface of the bracket (4); a threaded sleeve (12) is threadedly connected to the inner side of the threaded hole (6); a rotating ring (13) is integrally formed at the front end of the threaded sleeve (12); a rubber sleeve (14) is bonded to the inner side of the threaded sleeve (12); a threaded rod (11) is rotatably mounted inside the base (1); a rotating handle (8) is fixedly connected to the front end of the threaded rod (11); an adjusting bolt (10) is threadedly connected to the other side wall of the base (1); a limiting plate (9) is sleeved on the middle part of the adjusting bolt (10).
2. The axial displacement probe linear calibration platform according to claim 1, characterized in that: The adjusting bolt (10) passes through the extension block (7), and the limiting plate (9) is in contact with the side wall of the extension block (7).
3. The axial displacement probe linear calibration platform according to claim 1, characterized in that: The threaded rod (11) is threadedly connected to the extension block (7).
4. The axial displacement probe linear calibration platform according to claim 1, characterized in that: The rotating ring (13) is located on the front side of the bracket (4).
5. The axial displacement probe linear calibration platform according to claim 1, characterized in that: The rubber sleeve (14) is fitted onto the axial displacement probe.