A device for measuring the stretching amount of a circumferential pull rod

Abstract

The present invention discloses a circumferential tie rod stretching measurement device, comprising a support ring, twelve hydraulic tensioners, twelve sleeves, twelve positioning long rods, twelve micrometers and annular support plates; the twelve sleeves are evenly distributed on the top of the support ring along the circumferential direction, and the end face of the support ring is vertically penetrated, and the bottom of each sleeve is provided with an internal threaded hole of the same size as the circumferential tie rod, and the top of each sleeve is connected to a hydraulic tensioner; the top of each sleeve is connected to a positioning long rod, and the top of the positioning long rod extends from the top of the hydraulic tensioner, and the positioning long rod is colinear with the axis of the sleeve; the annular support plate is located above the support ring, and the annular support plate is coaxially arranged with the support ring, and twelve micrometers are evenly distributed on the bottom of the annular support plate along the circumferential direction, and the heads of the twelve micrometers face downwards and correspond one by one to the tops of the twelve positioning long rods. It is possible to achieve real-time measurement of the elongation of the twelve tie rods in the process of applying preload to the circumferential tie rod rotor.

Description

Technical Field

[0001] The invention belongs to the field of installation measurement and relates to a device for measuring the stretching amount of a circumferential pull rod. Background Art

[0002] Measuring the stretching amount during the process of applying preload to the circumferential tie rod rotor can ensure that the preload is applied accurately and reasonably. At the same time, measuring during each assembly and disassembly can form a complete set of data. By analyzing the data, the changes in the dynamic characteristics of the rotor during operation can be understood, providing a reference for the improved design of gas turbine manufacturers.

[0003] The measurement of stretching requires very high accuracy. On the one hand, the traditional measurement method is not accurate enough to obtain accurate stretching values. On the other hand, the structure is relatively complex and is not suitable for measuring the stretching of circumferential tie rod bolts. Summary of the invention

[0004] The purpose of the present invention is to overcome the above-mentioned shortcomings of the prior art and provide a circumferential tie rod stretching measurement device, which can achieve real-time measurement of the elongation of twelve tie rods during the process of applying preload to the circumferential tie rod rotor.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A circumferential tie rod stretching measurement device comprises a support ring, twelve hydraulic tensioners, twelve sleeves, twelve positioning long rods, twelve micrometers and a circular ring support plate;

[0007] Twelve sleeves are evenly distributed on the top of the support ring along the circumferential direction, and vertically penetrate the end face of the support ring. The bottom of each sleeve is provided with an internal threaded hole of the same size as the circumferential pull rod. The top of each sleeve is connected to a hydraulic tensioner; the top of each sleeve is connected to a positioning long rod, the top of the positioning long rod extends from the top of the hydraulic tensioner, and the positioning long rod is in line with the axis of the sleeve;

[0008] The circular support plate is located above the support ring, and the circular support plate is coaxially arranged with the support ring. Twelve micrometers are evenly distributed circumferentially at the bottom end of the circular support plate, with the heads of the twelve micrometers facing downwards, and corresponding one by one to the top ends of the twelve positioning long rods.

[0009] Preferably, the annular support plate is made of magnetic metal, and the micrometer is a magnetic base micrometer.

[0010] Preferably, a plurality of support plates are vertically arranged at the bottom of the support ring.

[0011] Furthermore, the number of the support plates is twelve, and the twelve support plates and the twelve sleeves are arranged alternately.

[0012] Preferably, the top of the sleeve extends into the hydraulic stretcher, and a sealing plate and a mating nut are provided on the top of the sleeve. The mating nut is fixedly connected to the top of the sleeve, and the sealing plate is located below the mating nut and is sealed to the inner wall of the hydraulic stretcher. The hydraulic stretcher is provided with a medium inlet below the sealing plate.

[0013] Furthermore, an axial internal threaded blind hole is provided on the top of the sleeve, the internal threaded blind hole is located at the center of the matching nut, and the bottom end of the positioning long rod is threadedly connected to the internal threaded blind hole.

[0014] Preferably, a positioning concave point is provided at the top end of the positioning rod.

[0015] Preferably, a plurality of reinforcing ribs are provided on the annular support plate.

[0016] Preferably, a long bracket is connected to the top of the circular support plate, the long bracket is parallel to the top surface of the circular support plate, and both ends of the long bracket are located outside the circular support plate.

[0017] A measurement method based on the circumferential tie rod stretching measurement device described in any one of the above items, comprising the following process;

[0018] Pass the support ring through the shaft head and install it on the wheel disc. After connecting the twelve sleeves and the circumferential tie rods, insert the twelve positioning long rods into the top of each sleeve.

[0019] The circular support plate is facing the support ring, and the heads of the twelve micrometers are against the top of each positioning long rod. The twelve micrometers are reset to zero, and the twelve hydraulic tensioners work at the same time, driving the sleeve to stretch the circumferential tie rod, and the positioning long rod moves upward accordingly. By reading the readings on each micrometer, the stretching amount of the circumferential tie rod at each position can be obtained until the stretching is completed.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] The present invention can be connected to the circumferential tie rod through the internal threaded hole of the sleeve, the circumferential tie rod can be stretched by a hydraulic stretcher, and the stretching amount of the circumferential tie rod can be measured by using a micrometer through the displacement of the positioning long rod, thereby realizing real-time measurement of the elongation of twelve circumferential tie rods during the process of applying pre-tightening force to the circumferential tie rod rotor.

[0022] Furthermore, the micrometer uses a magnetic base micrometer to be adsorbed on the circular support plate, so that the position is not restricted, and the position adjustment is convenient.

[0023] Furthermore, the positioning concave point is used to position the dial gauge head, ensuring that the position of the dial gauge head remains unchanged during the measurement process, thereby improving the measurement accuracy.

[0024] Furthermore, the reinforcing ribs can ensure that the lower surface of the circular support plate is free of deformation, thereby improving the measurement accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic structural diagram of the tensile measuring device of the present invention;

[0026] Figure 2 A bottom view of the support ring of the present invention;

[0027] Figure 3 It is a top view of the circular ring support plate of the present invention.

[0028] Among them: 1-support ring; 2-support plate; 3-sleeve; 4-hydraulic tensioner; 5-positioning long rod; 6-matching nut; 7-micrometer; 8-circular ring support plate; 9-reinforcement rib; 10-long bracket; 11-sealing plate. DETAILED DESCRIPTION

[0029] The present invention is further described in detail below in conjunction with the accompanying drawings:

[0030] like Figure 1 As shown, the circumferential tie rod stretching amount measuring device described in the present invention includes a support ring 1, a support plate 2, a sleeve 3, a hydraulic tensioner 4, a positioning long rod 5, a matching nut 6, a micrometer 7, a circular ring support plate 8, a reinforcing rib 9, a long bracket 10 and a sealing plate 11.

[0031] Twelve sleeves 3 are evenly distributed on the top of the support ring 1 along the circumferential direction, and vertically penetrate the end surface of the support ring 1. Twelve support plates 2 are vertically arranged at the bottom of the support ring 1. Figure 2 As shown, the twelve support plates 2 and the twelve sleeves 3 are arranged alternately, and the support rings 1 and the support plates 2 are both made of cast iron.

[0032] An internal threaded hole with the same size as the circumferential pull rod is provided at the bottom of each sleeve 3. The top of each sleeve 3 is connected to a hydraulic stretcher 4. The hydraulic stretcher 4 is installed in the groove of the support ring 1. The size of the groove of the support ring 1 matches the outer diameter of the hydraulic stretcher 4 to ensure that the hydraulic stretcher 4 cannot move radially.

[0033] The top of the sleeve 3 extends into the hydraulic stretcher 4. A sealing plate 11 and a mating nut 6 are provided on the top of the sleeve 3. The mating nut 6 is fixedly connected to the top of the sleeve 3. The sealing plate 11 is located below the mating nut 6 and is sealed and connected to the inner wall of the hydraulic stretcher 4. The hydraulic stretcher 4 is provided with a medium inlet below the sealing plate 11.

[0034] The top of each sleeve 3 is connected to a positioning long rod 5, and the top of the positioning long rod 5 extends from the top of the hydraulic stretcher 4. The positioning long rod 5 is colinear with the axis of the sleeve 3. An axial internal threaded blind hole is provided on the top of the sleeve 3. The internal threaded blind hole is located at the center position of the matching nut 6, and the bottom end of the positioning long rod 5 is threadedly connected to the internal threaded blind hole.

[0035] The top of the positioning rod 5 is provided with a positioning concave point for positioning the dial gauge 7 head, so as to ensure that the position of the dial gauge 7 head remains unchanged during the measurement process, thereby improving the measurement accuracy.

[0036] The annular support plate 8 is located above the support ring 1, and the annular support plate 8 is coaxially arranged with the support ring 1. Twelve micrometers 7 are evenly distributed at the bottom end of the annular support plate 8 along the circumferential direction. The heads of the twelve micrometers 7 face downward and correspond one by one to the top ends of the twelve positioning long rods 5.

[0037] The annular support plate 8 is made of magnetic metal, and the micrometer 7 is a magnetic base micrometer.

[0038] like Figure 3 As shown, reinforcing ribs 9 are welded on the circular support plate. The reinforcing ribs 9 are divided into a central cross reinforcing rib 9 and four long reinforcing ribs 9 in different directions. The reinforcing ribs 9 can ensure that there is no deformation on the lower surface of the circular support plate.

[0039] like Figure 3 As shown, a long bracket 10 is welded on the top of the circular support plate 8, the long bracket 10 is parallel to the top surface of the circular support plate 8, and both ends of the long bracket 10 are located outside the circular support plate 8. The long bracket 10 is I-shaped, and there are bolt holes at both ends of the long bracket 10, and the bolt holes are used to fix the long bracket 10.

[0040] The working process of the circumferential pull rod stretching measurement device of the present invention is as follows:

[0041] The assembly and disassembly of the circumferential tie rod rotor must be carried out on a special rotor precision inspection table. During assembly, the rotor must be placed vertically on the inspection table. Taking the measurement of the stretching amount of the circumferential tie rod at the turbine end as an example, the support ring 1 is installed on the last stage wheel disc at the turbine end through the shaft head, and the bottom surface of the support plate 2 falls on the last stage wheel disc at the turbine end to ensure that the support ring is horizontal. After connecting the twelve sleeves 3 and the circumferential tie rods, insert the twelve positioning long rods 5 into the matching nuts 6 to ensure that the positioning long rods 5 are tightened.

[0042] The two ends of the long bracket 10 are fixed to the stand by bolts, so that the circular support plate is facing the support ring 1. Twelve micrometers 7 are arranged on the circular support plate, and the heads of the micrometers are against the upper positioning concave points of each positioning long rod 5. The twelve micrometers 7 are reset to zero. The twelve hydraulic tensioners 4 are pressurized at the same time by the pressure pump, and the sleeve 3 is driven by the sealing plate 11 to stretch the circumferential tie rod, and the positioning long rod 5 moves upward accordingly. By reading the readings on each micrometer 7, the stretching amount of the circumferential tie rod at each position can be obtained.

[0043] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A device for measuring the stretching amount of a circumferential tie rod, characterized in that: It comprises a support ring (1), twelve hydraulic tensioners (4), twelve sleeves (3), twelve positioning long rods (5), twelve micrometers (7) and a circular ring support plate (8); Twelve sleeves (3) are evenly distributed on the top of the support ring (1) along the circumferential direction, and vertically penetrate the end surface of the support ring (1). The bottom of each sleeve (3) is provided with an internal threaded hole of the same size as the circumferential pull rod. The top of each sleeve (3) is connected to a hydraulic tensioner (4). The top of each sleeve (3) is connected to a positioning long rod (5). The top of the positioning long rod (5) extends from the top of the hydraulic tensioner (4). The positioning long rod (5) and the axis of the sleeve (3) are colinear. The annular support plate (8) is located above the support ring (1), the annular support plate (8) and the support ring (1) are coaxially arranged, twelve micrometers (7) are evenly distributed along the circumferential direction at the bottom end of the annular support plate (8), the heads of the twelve micrometers (7) face downwards, and correspond one by one to the top ends of the twelve positioning long rods (5); The annular support plate (8) is made of magnetic metal, and the micrometer (7) is a magnetic base micrometer; A plurality of support plates (2) are vertically arranged at the bottom of the support ring (1).

2. The circumferential tension rod stretching measurement device according to claim 1, characterized in that: The number of the support plates (2) is twelve, and the twelve support plates (2) and the twelve sleeves (3) are arranged alternately.

3. The circumferential tension rod stretching measurement device according to claim 1, characterized in that: The top of the sleeve (3) extends into the hydraulic tensioner (4). A sealing plate (11) and a matching nut (6) are provided at the top of the sleeve (3). The matching nut (6) is fixedly connected to the top of the sleeve (3). The sealing plate (11) is located below the matching nut (6) and is sealed to the inner wall of the hydraulic tensioner (4). The hydraulic tensioner (4) is provided with a medium inlet at a position below the sealing plate (11).

4. The circumferential tension rod stretching measurement device according to claim 3, characterized in that: An axial internal thread blind hole is provided at the top of the sleeve (3), the internal thread blind hole is located at the center of the matching nut (6), and the bottom end of the positioning long rod (5) is threadedly connected to the internal thread blind hole.

5. The circumferential tension rod stretching measurement device according to claim 1, characterized in that: A positioning concave point is arranged at the top end of the positioning long rod (5).

6. The circumferential tension rod stretching measurement device according to claim 1, characterized in that: A plurality of reinforcing ribs (9) are arranged on the annular support plate (8).

7. The circumferential tension rod stretching measurement device according to claim 1, characterized in that: A long bracket (10) is connected to the top of the circular support plate (8), the long bracket (10) is parallel to the top surface of the circular support plate (8), and both ends of the long bracket (10) are located outside the circular support plate (8).

8. A measurement method based on the circumferential tie rod stretching measurement device according to any one of claims 1 to 7, characterized in that: The following processes are included; Pass the support ring (1) through the shaft head and install it on the wheel disc. After connecting the twelve sleeves (3) and the circumferential pull rods, insert the twelve positioning long rods (5) into the top of each sleeve (3); The circular support plate faces the support ring (1), and the heads of the twelve micrometers (7) are pressed against the top of each positioning long rod (5). The twelve micrometers (7) are reset to zero, and the twelve hydraulic tensioners (4) work simultaneously, driving the sleeve (3) to stretch the circumferential pull rod, and the positioning long rod (5) moves upward accordingly. By reading the readings on each micrometer (7), the stretching amount of the circumferential pull rod at each position can be obtained until the stretching is completed.

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