Internal thread pitch diameter measuring device for large-size nut of gas turbine

Abstract

The invention discloses a gas turbine large-size nut internal thread pitch diameter measuring device, and relates to the technical field. The device comprises a nut, and further comprises a measuring part arranged in the nut; the fixing part is arranged on the measuring part; the measuring part comprises a measuring assembly, and the measuring assembly is arranged in the nut; the calibration assembly is arranged on the measurement assembly; the measuring assembly comprises an internal thread pitch diameter arranged on a nut, and a measuring support is arranged in the nut. By arranging the measuring part, the problems that in the machining process of an existing gas turbine rotor nut, multiple times of feeding is needed, the process size of threads needs to be measured before each time of feeding, an existing measuring device can only detect the final size, the middle size in the machining process is inconvenient to effectively monitor, and the machining precision is poor are solved. And the working allowance and the tool compensation parameters are difficult to set in real time.

Description

Technical Field

[0001] This invention belongs to the field of nut processing and measurement technology, and in particular relates to a device for measuring the mean diameter of the internal thread of a large-size nut for a gas turbine. Background Technology

[0002] The gas turbine large-size nut internal thread pitch diameter measuring device is a specialized device used to accurately measure the pitch diameter of the internal threads of large nuts in key components of gas turbines. The device typically consists of a high-precision measuring mechanism, a positioning and clamping system, and a data acquisition and processing unit. It can achieve stable and reliable measurement under complex working conditions. Its measurement principle is based on contact or non-contact detection methods. By accurately matching the thread profile, it acquires pitch diameter data and performs real-time analysis. This device can effectively improve the efficiency of thread processing quality inspection, ensure the assembly accuracy and operational safety of gas turbines, and is an important measuring tool in the manufacturing and maintenance of large power equipment.

[0003] However, existing gas turbine rotor nuts require multiple feeds during machining, and the thread dimensions must be measured before each feed. Since existing measuring devices can only detect the final dimensions, it is not convenient to effectively monitor intermediate dimensions during machining, making it difficult to set machining allowances and tool compensation parameters in real time. Summary of the Invention

[0004] The purpose of this invention is to provide a measuring device for the pitch diameter of the internal thread of a large-size nut for gas turbines. By setting up a measuring unit, it solves the problem that existing gas turbine rotor nuts require multiple feeds during processing, and the thread process dimension needs to be measured before each feed. Since existing measuring devices can only detect the final dimension, it is not convenient to effectively monitor the intermediate dimensions during the processing, which makes it difficult to set the machining allowance and tool compensation parameters in real time.

[0005] To solve the above-mentioned technical problems, the present invention is achieved through the following technical solution: This invention relates to a device for measuring the pitch diameter of the internal thread of a large-size nut for a gas turbine. The device includes a nut and further comprises: a measuring part disposed within the nut; a fixing part disposed on the measuring part; the measuring part includes a measuring component disposed within the nut; and a calibration component disposed on the measuring component. The measuring component includes the pitch diameter of the internal thread formed on the nut. A measuring bracket is disposed within the nut. A dedicated probe is slidably connected to the measuring component. The bottom end of the dedicated probe extends into the pitch diameter of the internal thread. A dial indicator is disposed at the top end of the dedicated probe. A fixing member is disposed on the dedicated probe. The bottom of the measuring bracket contacts the pitch diameter of the internal thread of the nut. The fixing member includes a bolt fixedly connected to the top of the dedicated probe. A bolt hole is formed on the outer wall of the dial indicator, and the outer wall of the bolt is threadedly connected to the bolt hole.

[0006] Furthermore, the fixing part includes a positioning component disposed on the measuring bracket; and a fixing component disposed on the measuring bracket.

[0007] Furthermore, the calibration assembly includes a calibration device disposed at the bottom of the measurement bracket, with the bottom end of the dedicated probe contacting the top of the calibration device.

[0008] Furthermore, the positioning assembly includes several positioning holes formed on the top of the measuring bracket, a positioning ring is fixedly connected to the outer wall of the special probe, a positioning element is provided on the positioning ring, the bottom of the positioning ring is in contact with the top of the measuring bracket, and the positioning element includes several insert rods fixedly connected to the bottom of the positioning ring, the bottom ends of the several insert rods extend into the several positioning holes, and the outer walls of the several insert rods are slidably connected to the several positioning holes.

[0009] Furthermore, the fixing component includes a threaded hole on the front of the measuring bracket, a screw is threaded into the threaded hole, a knob is fixedly connected to the outer wall of the screw, and the rear end of the screw contacts a dedicated probe.

[0010] The present invention has the following beneficial effects: 1. By setting up a measurement unit, the problem of traditional measuring devices being able to only detect the final size but not monitor intermediate dimensions during machining is solved, making it difficult to set machining allowances and tool compensation parameters in real time. The measurement unit uses a dedicated probe and dial indicator as its core, combined with a calibration device to achieve measurement. The dedicated probe contacts the minor diameter of the thread, and the dial indicator reads the minimum value of radial oscillation. Combined with the thread specification parameters, the actual value of the pitch diameter is automatically calculated. This design can quickly measure after each feed operation in nut machining, obtain intermediate dimension data in real time, and avoid the lag mode of traditional machining, final inspection, and rework. The calibration device ensures that the reference is consistent before each measurement, eliminates the influence of ambient temperature or mechanical errors on the measurement results, and ensures data reliability. The measurement unit allows operators to dynamically adjust the machining allowance and tool compensation value for the next cut based on the real-time dimensions, reducing the scrap rate caused by dimensional deviations and improving machining efficiency. 2. By incorporating a fixing unit, the problem of probe misalignment and inaccurate positioning leading to large fluctuations in measurement data during the measurement process is solved. The positioning component of the fixing unit, through the insertion rod on the positioning ring cooperating with the positioning hole of the measuring bracket, enables quick insertion and removal of the dedicated probe, ensuring consistent radial position of the probe during each installation and avoiding measurement errors introduced by manual placement deviations. The screw and knob of the fixing component can lock the probe during measurement, preventing it from sliding during radial oscillation, further enhancing structural stability. The combined effect of these two components ensures stable contact between the probe and the thread pitch diameter in both handheld operation and automated testing, ensuring reliable dial indicator readings. The modular design of the fixing unit also supports quick replacement of probes of different specifications, adapting to the measurement needs of various thread sizes and improving the versatility and ease of operation of the device.

[0011] Of course, any product implementing this invention does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0012] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0013] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a partial cross-sectional view of the measuring section of the present invention; Figure 3 This is a partial cross-sectional view of the fixing part of the present invention; Figure 4 For the present invention Figure 2 A magnified structural diagram of A in the middle; Figure 5 For the present invention Figure 2 A magnified structural diagram of B in the diagram.

[0014] The attached diagram lists the components represented by each number as follows: 1. Nut; 2. Measuring section; 21. Measuring assembly; 211. Internal thread pitch diameter; 212. Measuring bracket; 213. Special probe; 214. Dial indicator; 215. Bolt; 216. Bolt hole; 22. Calibration assembly; 221. Calibration device; 3. Fixing part; 31. Positioning assembly; 311. Positioning hole; 312. Positioning ring; 313. Insert rod; 32. Fixing assembly; 321. Threaded hole; 322. Screw; 323. Knob. Detailed Implementation

[0015] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0016] Please see Figure 1-5 As shown, the present invention is a measuring device for the pitch diameter of the internal thread of a large-size nut for a gas turbine, including a nut 1, and further including: a measuring part 2, which is disposed inside the nut 1; and a fixing part 3, which is disposed on the measuring part 2; The measuring unit 2 includes a measuring component 21, which is disposed inside the nut 1; and a calibration component 22, which is disposed on the measuring component 21. The measuring component 21 includes an internal thread diameter 211 formed on the nut 1. A measuring bracket 212 is disposed inside the nut 1. A dedicated probe 213 is slidably connected to the measuring component 21. The bottom end of the dedicated probe 213 extends into the internal thread diameter 211. A dial indicator 214 is disposed at the top end of the dedicated probe 213. A fixing component is disposed on the dedicated probe 213. The bottom of the measuring bracket 212 contacts the internal thread diameter 211 of the nut 1. The fixing component includes a bolt 215 fixedly connected to the top of the dedicated probe 213. A bolt hole 216 is formed on the outer wall of the dial indicator 214. The outer wall of 5 is threadedly connected to the bolt hole 216. The calibration component 22 includes a calibration device 221 set at the bottom of the measuring bracket 212. The bottom end of the special probe 213 contacts the top of the calibration device 221. During the test, the dial indicator 214 is first zeroed to ensure the accuracy of the measurement reference. Then, the measuring device is placed inside the nut 1 to be measured, so that the bottom ends of the measuring bracket 212 and the special probe 213 are in full contact with the thread pitch diameter. The measuring bracket 212 is held and swung radially to read the minimum value of the dial indicator 214. Finally, the minimum value, thread specification and accuracy grade are input into the calculation program. The system will automatically calculate the actual measured value of the pitch diameter and compare it with the preset standard value, thereby automatically determining whether the pitch diameter of the internal thread of the nut 1 is qualified.

[0017] The fixing part 3 includes a positioning component 31, which is mounted on the measuring bracket 212; and a fixing component 32, which is also mounted on the measuring bracket 212. The positioning component 31 includes several positioning holes 311 formed on the top of the measuring bracket 212. A positioning ring 312 is fixedly connected to the outer wall of the dedicated probe 213. Positioning elements are provided on the positioning ring 312, and the bottom of the positioning ring 312 contacts the top of the measuring bracket 212. The positioning elements include several insert rods 313 fixedly connected to the bottom of the positioning ring 312. The bottom ends of the insert rods 313 extend into the positioning holes 311, and the outer walls of the insert rods 313 are slidably connected to the positioning holes 311. The fixing component 32 includes a threaded hole 321 formed on the front of the measuring bracket 212. A screw 322 is threaded into the threaded hole 321, and a knob 323 is fixedly connected to the outer wall of the screw 322. The rear end of the screw 322 is connected to... The dedicated probe 213 is in contact with the micrometer. During use, the theoretical minor diameter and pitch diameter relationship is calculated according to the thread specification. Then, a suitable dedicated probe 213 is selected, and the two are fixedly connected by the bolt 215 on its top and the bolt hole 216 of the dial indicator 214. After the connection is completed, the dedicated probe 213 is inserted into the measuring bracket 212. At this time, the positioning ring 312 on the probe will drive the four insertion rods 313 to be inserted into the four positioning holes 311 on the top of the measuring bracket 212 simultaneously, thereby realizing the rapid positioning and limiting of the dedicated probe 213. Next, the positioned dedicated probe 213, dial indicator 214 and measuring bracket 212 are placed on the calibration device 221 for calibration. After calibration, if it is necessary to fix the overall structure, the screw 322 on the measuring bracket 212 can be tightened inward to lock and limit the sliding dedicated probe 213. This setting can significantly improve the stability of the measuring device.

[0018] One specific application of this embodiment is as follows: When using it, the theoretical minor diameter and pitch diameter relationship is calculated according to the thread specification. Then, a suitable special probe 213 is selected, and the two are fixedly connected by the bolt 215 on its top and the bolt hole 216 of the dial indicator 214. After the connection is completed, the special probe 213 is inserted into the measuring bracket 212. At this time, the positioning ring 312 on the probe will drive the four insertion rods 313 to be inserted into the four positioning holes 311 on the top of the measuring bracket 212 simultaneously, thereby realizing the rapid positioning and limiting of the special probe 213. Then, the positioned special probe 213, dial indicator 214 and measuring bracket 212 are placed on the calibration device 221 for calibration. After calibration, if it is necessary to fix the overall structure, the screw 322 on the measuring bracket 212 can be screwed inward to lock and limit the sliding special probe 213. Through this setting, the stability of the measuring device can be significantly improved. During testing, the dial indicator 214 is first zeroed to ensure accurate measurement reference. Then, the measuring device is placed inside the nut 1 being tested, so that the bottom of the measuring bracket 212 and the special probe 213 are in full contact with the thread pitch diameter. The measuring bracket 212 is held and swung radially to read the minimum value of the dial indicator 214. Finally, the minimum value, thread specification and accuracy class are input into the calculation program. The system will automatically calculate the actual measured value of the pitch diameter and compare it with the preset standard value, thereby automatically determining whether the pitch diameter of the internal thread of the nut 1 is qualified.

Claims

1. A device for measuring the pitch diameter of the internal thread of a large-size nut for a gas turbine, comprising a nut (1), characterized in that, Also includes: Measuring part (2), the measuring part (2) is disposed inside the nut (1); A fixing part (3) is provided on the measuring part (2); The measuring part (2) includes a measuring component (21), which is disposed inside the nut (1); as well as A calibration component (22) is disposed on the measurement component (21); The measuring component (21) includes an internal thread pitch diameter (211) opened on a nut (1), a measuring bracket (212) is provided inside the nut (1), a special probe (213) is slidably connected to the measuring component (21), the bottom end of the special probe (213) extends into the internal thread pitch diameter (211), a dial indicator (214) is provided at the top end of the special probe (213), and a fixing member is provided on the special probe (213); The bottom of the measuring bracket (212) is in contact with the inner thread diameter (211) of the nut (1).

2. The gas turbine large-size nut internal thread pitch diameter measuring device according to claim 1, characterized in that, The fixing part (3) includes a positioning component (31), which is disposed on the measuring bracket (212); and Fixing component (32) is disposed on measuring bracket (212).

3. The device for measuring the pitch diameter of the internal thread of a large-size nut for a gas turbine according to claim 1, characterized in that, The calibration assembly (22) includes a calibration device (221) disposed at the bottom of the measuring bracket (212), and the bottom end of the dedicated probe (213) is in contact with the top of the calibration device (221).

4. The device for measuring the pitch diameter of the internal thread of a large-size nut for a gas turbine according to claim 2, characterized in that, The positioning component (31) includes several positioning holes (311) opened on the top of the measuring bracket (212), and a positioning ring (312) is fixedly connected to the outer wall of the special probe (213), and a positioning element is provided on the positioning ring (312); The bottom of the positioning ring (312) is in contact with the top of the measuring bracket (212).

5. A device for measuring the pitch diameter of the internal thread of a large-size nut for a gas turbine according to claim 2, characterized in that, The fixing component (32) includes a threaded hole (321) on the front of the measuring bracket (212), a screw (322) is threadedly connected to the threaded hole (321), and a knob (323) is fixedly connected to the outer wall of the screw (322). The rear end of the screw (322) is in contact with the special probe (213).

6. The device for measuring the pitch diameter of the internal thread of a large-size nut for a gas turbine according to claim 1, characterized in that, The fastener includes a bolt (215) fixedly connected to the top of the special probe (213), and the outer wall of the dial indicator (214) is provided with bolt holes (216). The outer wall of the bolt (215) is threadedly connected to the bolt hole (216).

7. A device for measuring the pitch diameter of the internal thread of a large-size nut for a gas turbine according to claim 3, characterized in that, The positioning element includes a plurality of insert rods (313) fixedly connected to the bottom of the positioning ring (312), and the bottom ends of the plurality of insert rods (313) extend into a plurality of positioning holes (311); Among them, the outer walls of several insertion rods (313) are slidably connected to several positioning holes (311).

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