CN212512812U

CN212512812U - Steam turbine rotor back wheel bolt elongation measuring device

Info

Publication number: CN212512812U
Application number: CN202021208563.7U
Authority: CN
Inventors: 秦专; 李战争; 骆祖春; 窦建业; 严巍峰
Original assignee: Jiangsu Nuclear Power Corp
Current assignee: Jiangsu Nuclear Power Corp
Priority date: 2020-06-28
Filing date: 2020-06-28
Publication date: 2021-02-09
Anticipated expiration: 2030-06-28

Abstract

The utility model belongs to the measurement technology, in particular to a steam turbine rotor back wheel bolt elongation measurement device, which comprises a measurement frame, a measurement end fixing block and an adjusting end fixing block which are respectively arranged at the measurement end and the adjusting end of the measurement frame, a dial indicator and a measurement screw rod which are arranged through the measurement end fixing block, and an adjusting screw rod which is arranged through the adjusting end fixing block; the dial indicator, the measuring screw rod, the adjusting screw rod and the backrest wheel bolt are coaxial; the flat end of the measuring screw presses a measuring head of the dial indicator, and the adjusting screw is tightly attached to the non-threaded end of the to-be-measured back wheel bolt; and the measuring end of the measuring screw rod is contacted with the threaded end of the back wheel bolt to be measured. The device can measure the elongation of the bolt at the position with a complex structure, and solves the problem of poor measurement of the complex position in the measuring process of the outside micrometer.

Description

Steam turbine rotor back wheel bolt elongation measuring device

Technical Field

The utility model belongs to the measurement technique, concretely relates to an elongation measuring device that is used for steam turbine rotor back of the body wheel bolt-up front and back.

Background

The back wheels of the rotors of the steam turbine of the power plant are connected by bolts, the elongation after the bolts are fastened has different requirements according to different specifications and models of the bolts, and whether the back wheels are fastened in place according to design requirements can be intuitively reflected through the elongation.

The elongation of the backrest wheel bolt is measured by using a standard outside micrometer generally, the original length is measured by using the outside micrometer before the bolt is installed, the length of the bolt stretched by fastening is measured by using the outside micrometer after the bolt is installed in place, and the difference is the elongation of the backrest wheel bolt. However, some backing wheels are complex in structure, and cannot be measured by using an outer diameter micrometer, such as a high-pressure rotor of a turbine of a VVER nuclear power unit, a gear wheel of a turning device is arranged on a rear back wheel of the high-pressure rotor, the diameter of the gear wheel of the turning device is larger than that of the backing wheel, the width of the gear wheel of the turning device also exceeds the thickness of the rear back wheel of the high-pressure rotor, and the gear wheel of the turning device is irregular.

Disclosure of Invention

The utility model aims at providing a steam turbine rotor back wheel bolt elongation measuring device, it can replace the external micrometer to measure back wheel bolt elongation, and it is more convenient, the suitability is better to measure, tests the speed faster.

The technical scheme of the utility model as follows:

a steam turbine rotor back rest wheel bolt elongation measuring device comprises a measuring frame, a measuring end fixing block and an adjusting end fixing block which are respectively arranged at a measuring end and an adjusting end of the measuring frame, a dial indicator and a measuring screw rod which are arranged through the measuring end fixing block, and an adjusting screw rod which is arranged through the adjusting end fixing block; the dial indicator, the measuring screw rod, the adjusting screw rod and the backrest wheel bolt are coaxial; the flat end of the measuring screw presses a measuring head of the dial indicator, and the adjusting screw is tightly attached to the non-threaded end of the to-be-measured back wheel bolt; and the measuring end of the measuring screw rod is contacted with the threaded end of the back wheel bolt to be measured.

The measuring frame is C-shaped, the lower ends of the two sides of the measuring frame are respectively a measuring end and an adjusting end, the measuring frame is installed on the outer side of the large gear of the barring gear, and the measuring end and the adjusting end are respectively located at the two ends of the back wheel bolt to be measured.

The measuring end is provided with a fixing bolt hole I, and the adjusting end is provided with a fixing bolt hole II; a fixed block bolt hole I is processed at the upper end of the measuring end fixing block, and a fixed block bolt hole II is processed at the upper end of the adjusting end fixing block; fixing bolt hole I align with fixing block bolt hole I, through the fixed end fixing block of measuring of fixing block fastener I, fixing bolt hole II align with fixing block bolt hole II, fix through fixing block fastener II and adjust the end fixing block.

The measuring end fixing block lower extreme processing mounting groove for the lower extreme of measuring end fixing block falls into two parts, the part processing plug screw thread hole in the outside, the partial processing measuring rod screw hole in the inboard, plug screw thread hole and measuring rod screw hole internal diameter size the same and coaxial.

The measuring end is provided with 4 fixing bolt holes I which are positioned at the same horizontal height and are uniformly spaced; fixed block bolt hole I be 4, the position corresponds with fixed bolt hole I.

The utility model discloses a dial indicator, including the dial indicator sleeve hole, the dial indicator is installed in the sleeve hole of dial indicator, the side processing has a set screw hole, the dial indicator install at the dial indicator sleeve hole through its outside sleeve, screw in the set screw hole through the set screw tightly with the dial indicator top.

And the lower end of the adjusting end fixing block is provided with an adjusting screw threaded hole which penetrates through the adjusting end fixing block along the axial direction.

The adjusting end is provided with 2 fixing bolt holes II which are positioned at the same horizontal height; and 2 fixing block bolt holes II are arranged, and the positions of the fixing block bolt holes II correspond to those of the fixing bolt holes II.

The measuring screw is installed in the measuring rod threaded hole in a threaded mode, the adjusting screw is installed in the adjusting screw threaded hole in a threaded mode in a screwed mode, and the adjusting screw is locked through the locking nut after being in contact with the backrest wheel bolt.

The utility model discloses an effect as follows: designing fixed blocks which are respectively fixed at two ends of the measuring frame; the fixed block is provided with a screw plug, a dial indicator, a measuring screw rod and an adjusting screw rod.

Adjusting the adjusting screw to a proper position according to the original length of the bolt, and locking the adjusting screw by using a locking nut; the end part of the adjusting screw is tightly attached to one end of the backrest wheel bolt, the measuring screw is rotated to enable the round head end to be pressed to be tightly attached to the other end of the backrest wheel bolt, the flat head end compresses a measuring head of the dial indicator, and the reading of the dial indicator is recorded; after the back wheel bolt is fastened and elongated through the nut, the measuring screw rod is adjusted in the same method, the reading of the dial indicator is read, and the difference of the two numbers is the elongation of the bolt.

Compared with an external micrometer, the dial indicator has the advantages of more direct and simpler reading and higher measuring speed.

The conventional outside micrometer cannot measure the elongation of the bolt at a position with a complex structure due to the self structure, and can avoid an obstacle to measure by manufacturing a measuring frame in a targeted manner; and the device can be disassembled in the measuring process and assembled after crossing the device, so that the data measurement is not influenced. The problem of complicated position measurement not good in the outside micrometer measuring process is solved.

Along with the increase of unit capacity, turbo generator set rotor backrest wheel bolt also is longer and longer, and the external micrometer that the range is super big is expensive and frequency of utilization low, has not had the external micrometer of corresponding measuring range even to measure, processes a measuring rack according to the length of bolt, and the course of working is simple, and the expense is few, is far less than purchasing the external micrometer expense that the range is super big.

Drawings

FIG. 1 is a schematic view of a steam turbine rotor back-wheel bolt elongation measuring device;

FIG. 2 is a schematic view of a measuring stand;

FIG. 3a is a schematic view of a measuring end fixing block;

FIG. 3b is a side view of a measuring end fixing block;

FIG. 4a is a schematic view of an adjusting end fixing block;

FIG. 4b is a side view of the adjustment end fixing block;

FIG. 5a is a schematic view of a screw plug;

FIG. 5b is a side view of the plug;

in the figure: 1. a high pressure rotor; 2. a dial indicator; 3. a set screw; 4. a plug screw; 5. a measuring end fixing block; 6. measuring a screw rod; 7. a fixed block fastener I; 8. a nut; 9. a high pressure rotor back wheel; 10. a measuring frame; 11. turning a bull gear; 12. a low pressure rotor back wheel; 13. a back wheel bolt; 14. a fixed block fastener II; 15. adjusting the end fixing block; 16. locking the nut; 17. adjusting the screw rod; 18. a low-pressure rotor; 19. a fixing bolt hole I; 20. a fixing bolt hole II; 21. a screw plug internal threaded hole; 22. a fixed block bolt hole I; 23. a measuring rod threaded hole; 24. a fixed block bolt hole II; 25. adjusting a threaded hole of the screw; 26. sleeve holes of dial indicators; 27. a set screw hole.

Detailed Description

The present invention will be further explained with reference to the drawings and the detailed description.

The measuring device as shown in fig. 1 comprises a measuring frame 10, a measuring end fixing block 5 and an adjusting end fixing block 15 respectively installed at a measuring end and an adjusting end of the measuring frame 10, a dial indicator 2 and a measuring screw 6 installed through the measuring end fixing block 5, and an adjusting screw 17 installed through the adjusting end fixing block 15.

The measuring object of the device is a back wheel bolt 13 for connecting a high-pressure rotor back wheel 9 and a low-pressure rotor back wheel 12, the back wheel bolt is fastened through a nut 8, the high-pressure rotor back wheel 9 and the low-pressure rotor back wheel 12 are respectively connected with a high-pressure rotor 1 and a low-pressure rotor 18, and a turning gear 11 is installed on the outer side of the high-pressure rotor back wheel 9.

The above-mentioned measuring device must satisfy the condition that the dial indicator 2, the measuring screw 6, the adjusting screw 17 and the back wheel bolt 13 are coaxial. The elongation of the backrest wheel bolt 13 is obtained by measuring with the dial indicator 2.

As shown in fig. 2, the measuring rack 10 is C-shaped, the lower ends of the two sides are respectively a measuring end and an adjusting end, and the measuring rack 10 is installed outside the large barring gear 11. The measuring end is processed with fixing bolt hole I19, and the regulation end is processed with fixing bolt hole II 20.

As shown in fig. 3a and 3b, the upper end of the measuring end fixing block 5 is provided with a fixing block bolt hole i 22, and the lower end of the measuring end fixing block is provided with a mounting groove, so that the lower end of the measuring end fixing block 5 is divided into two parts, the outer part of the measuring end fixing block is provided with a plug screw thread hole 21, the inner part of the measuring end fixing block is provided with a measuring rod thread hole 23, and the plug screw thread hole 21 and the measuring rod thread hole 23 have the same and. The upper end of the measuring end fixing block 5 is clamped at the front side and the rear side of the measuring end of the measuring frame 10, the fixing bolt holes I19 are aligned with the fixing block bolt holes I22, and the measuring end fixing block 5 is fixed through fixing block fasteners I7.

As shown in fig. 4a and 4b, the adjusting end fixing block 15 has a fixing block bolt hole ii 24 formed at an upper end thereof, and an adjusting screw threaded hole 25 axially penetrating the adjusting end fixing block 15 formed at a lower end thereof. The upper end of the adjusting end fixing block 15 is clamped on the front side and the rear side of the adjusting end of the measuring frame 10, the fixing bolt holes II 20 are aligned with the fixing block bolt holes II 24, and the adjusting end fixing block 15 is fixed through a fixing block fastening piece II 14.

The measuring screw 6 is installed in the measuring rod threaded hole 23 in a threaded mode, the adjusting screw 17 is installed in the adjusting screw threaded hole 25 in a threaded mode in a screwing mode, the adjusting screw 17 is locked through the locking nut 16 after being in contact with the backrest wheel bolt 13, and the measuring screw 6 is prevented from loosening.

The screw plug 4 is installed in the screw plug internal thread hole 21 in a screwed mode, a common gasket is additionally installed between the screw plug 4 and the measuring end fixing block 5, the screwing depth of the screw plug 4 is adjusted, and therefore the installation position of the dial indicator is guaranteed.

As shown in fig. 5a and 5b, the screw plug 4 is provided with a dial indicator sleeve hole 26 along the axial direction at the center and a stop screw hole 27 at the side. The dial indicator 2 is arranged in a sleeve hole 26 of the dial indicator through a sleeve outside the dial indicator, and the dial indicator 2 is tightly pressed by screwing the stop screw 3 into the stop screw hole 27.

The adjusting end fixing block 15 and the measuring end fixing block 5 are respectively fixed at two ends of the measuring frame 10 through fixing

block fasteners

14 and 7; the screw plug 4 is screwed into an internal thread hole of the measuring end fixing block 5, and the dial indicator sleeve 2 is fixed in the internal thread hole of the screw plug 4 through the stop screw 3; assembling a measuring screw 6 on a measuring end fixing block 5, and pressing a measuring head of the dial indicator 2 by a butt end; the adjusting screw 17 is screwed into the adjusting end fixing block 15 and is locked and positioned by the locking nut 16.

When in installation, the method comprises the following steps:

the method comprises the following steps: and mounting the measuring end fixing block 5, aligning the fixing bolt hole I19 with the fixing bolt hole I22, and fastening the measuring end fixing block 5 to the left end of the measuring frame 10 through a fixing block fastener I7.

Step two: and installing and adjusting the end fixing block 15, aligning the fixing bolt hole II 20 with the fixing block bolt hole II 24, and fastening the adjusting end fixing block 15 to the right end of the measuring frame 10 through a fixing block fastening piece II 14.

Step three: the measuring screw 6 is assembled on the measuring end fixing block 5 through the measuring rod threaded hole 23.

Step four: screwing the adjusting screw 17 into the adjusting end fixing block 15 through the adjusting screw threaded hole 25, and rotating the adjusting screw 17 to the position according to the position of the backrest wheel bolt 13; the lock nut 16 is used for locking and loosening prevention after the adjusting screw 17 is rotated into position.

Step five: and checking the measuring screw 6 and the adjusting screw 17 which are installed in place by using a ruler, wherein the central lines of the two screws are on the same straight line, if the deviation is large, the fixing block fastening piece I7 and the fixing block fastening piece II 14 are loosened to adjust until the measuring screw 6 and the adjusting screw 17 are on the same straight line, and formally screwing the fixing block fastening piece I7 and the fixing block fastening piece II 14 after the correction is finished.

Step six: the screw plug 4 is screwed into the measuring end fixing block 5, and a common gasket is additionally arranged between the screw plug 4 and the measuring end fixing block 5 as required to adjust the screwing depth of the screw plug 4 so as to ensure the installation position of the dial indicator.

Step seven: the sleeve of the dial indicator 2 extends into the sleeve hole 26 of the dial indicator plug 4 and is screwed into the stop screw hole 27 through the stop screw 3 to be tightly pressed.

Step eight: and rotating the measuring screw 6, wherein the central position of the end part of the measuring screw 6 tightly presses the measuring head of the dial indicator 2, so that the revolution indicator of the dial indicator is positioned at a half position of the measuring range, and the measuring tool is preliminarily assembled.

Claims

1. The utility model provides a steam turbine rotor backrest wheel bolt elongation measuring device which characterized in that: the device comprises a measuring frame (10), a measuring end fixing block (5) and an adjusting end fixing block (15) which are respectively arranged at a measuring end and an adjusting end of the measuring frame (10), a dial indicator (2) and a measuring screw rod (6) which are arranged through the measuring end fixing block (5), and an adjusting screw rod (17) which is arranged through the adjusting end fixing block (15); the dial indicator (2), the measuring screw (6), the adjusting screw (17) and the backrest wheel bolt (13) are coaxial; the butt end of the measuring screw (6) compresses a measuring head of the dial indicator (2), and the adjusting screw (17) is tightly attached to the non-threaded end of the back rest wheel bolt (13) to be measured; and the measuring end of the measuring screw (6) is contacted with the threaded end of the back wheel bolt (13) to be measured.

2. The steam turbine rotor back-wheel bolt elongation measuring device according to claim 1, wherein: the measuring frame (10) is C-shaped, the lower ends of the two sides are respectively a measuring end and an adjusting end, the measuring frame (10) is installed on the outer side of the large turning gear (11), and the measuring end and the adjusting end are respectively located at the two ends of a to-be-measured back wheel bolt (13).

3. The steam turbine rotor back-up pulley bolt elongation measuring apparatus of claim 2, wherein: the measuring end is provided with a fixing bolt hole I (19), and the adjusting end is provided with a fixing bolt hole II (20); a fixed block bolt hole I (22) is processed at the upper end of the measuring end fixed block (5), and a fixed block bolt hole II (24) is processed at the upper end of the adjusting end fixed block (15); fixing bolt hole I (19) align with fixing block bolt hole I (22), through I (7) fixed measurement end fixing block (5) of fixing block fastener, fixing bolt hole II (20) align with fixing block bolt hole II (24), through II (14) fixed regulation end fixing block (15) of fixing block fastener.

4. The steam turbine rotor back-wheel bolt elongation measuring device according to claim 3, wherein: the lower end of the measuring end fixing block (5) is provided with a mounting groove, so that the lower end of the measuring end fixing block (5) is divided into two parts, the outer part is provided with a screw plug internal thread hole (21), the inner part is provided with a measuring rod thread hole (23), and the internal diameters of the screw plug internal thread hole (21) and the measuring rod thread hole (23) are the same and coaxial.

5. The steam turbine rotor back-wheel bolt elongation measuring device according to claim 4, wherein: the measuring end is provided with 4 fixing bolt holes I (19) which are positioned at the same horizontal height and are uniformly spaced; the number of the fixing block bolt holes I (22) is 4, and the positions of the fixing block bolt holes I (22) correspond to those of the fixing bolt holes I (19).

6. The steam turbine rotor back-wheel bolt elongation measuring device according to claim 5, wherein: the utility model discloses a dial indicator, including screw plug internal thread hole (21), be equipped with screw plug (4) in screw plug internal thread hole (21), screw plug (4) center has percentage table cover barrel hole (26) along axial processing, side processing has stop screw hole (27), percentage table (2) install in percentage table cover barrel hole (26) through its outside sleeve, screw in stop screw hole (27) through stop screw (3) and push up percentage table (2).

7. The steam turbine rotor back-wheel bolt elongation measuring device according to claim 3, wherein: and the lower end of the adjusting end fixing block (15) is provided with an adjusting screw threaded hole (25) which penetrates through the adjusting end fixing block (15) along the axial direction.

8. The steam turbine rotor back-up pulley bolt elongation measuring apparatus of claim 7, wherein: the adjusting end is provided with 2 fixing bolt holes II (20) which are positioned at the same horizontal height; and 2 fixing block bolt holes II (24) are arranged, and the positions of the fixing block bolt holes II (24) correspond to those of the fixing bolt holes II (20).

9. The steam turbine rotor back-up pulley bolt elongation measuring apparatus of claim 8, wherein: the measuring screw (6) is installed in the measuring rod threaded hole (23) in a threaded mode, the adjusting screw (17) is installed in the adjusting screw threaded hole (25) in a threaded mode, and the adjusting screw (17) is locked through the locking nut (16) after being in contact with the backrest wheel bolt (13).