CN212963105U - Instrument for measuring bolt elongation of high-pressure cylinder of steam turbine - Google Patents
Instrument for measuring bolt elongation of high-pressure cylinder of steam turbine Download PDFInfo
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- CN212963105U CN212963105U CN202021307893.1U CN202021307893U CN212963105U CN 212963105 U CN212963105 U CN 212963105U CN 202021307893 U CN202021307893 U CN 202021307893U CN 212963105 U CN212963105 U CN 212963105U
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Abstract
The utility model belongs to the technical field of measuring tool, concretely relates to steam turbine high pressure cylinder bolt elongation measuring tool. The utility model discloses a left side lower link connecting pin, left side supporting legs fixed axle, the supporting legs is measured in the left side, left side lower link, left side pull rod connecting pin, pull rod connecting pin on the left side, connecting sleeve, tensile cover, a pedestal, the stopper, compression spring, shroud, stop screw, plug screw, connecting rod, tensile cover connecting shaft, connecting block, pull rod connecting pin on the right side, pull rod on the right side, right side pull rod connecting pin, right side lower link, the supporting legs is measured on the right side, right side supporting legs fixed axle, right side lower link connecting pin, percentage table. The utility model discloses can accurate measuring bolt extension capacity around hot is tight, ensure that the bolt pretightning force accords with the design requirement, solve the former cylinder in-situ facet bolt and probably have misoperation's the condition at the pretension in-process.
Description
Technical Field
The utility model belongs to the technical field of measuring tool, concretely relates to steam turbine high pressure cylinder bolt elongation measuring tool.
Background
The flanges of the upper cylinder and the lower cylinder of the steam turbine in the power plant are generally connected by bolts, the tightness of the cylinder is guaranteed, the bolts need to be pre-tightened during installation, otherwise, the upper cylinder and the lower cylinder can be separated after high-pressure steam is introduced into the cylinder, and the steam leaks from the flange joint surface. Especially, the high-pressure cylinder has high steam inlet parameters, thick flanges and large bolts, and the normal cold tightening means can not reach the designed fastening torque at all, so that the split bolts of the high-pressure cylinder of the steam turbine in almost all power generation plants are pre-tightened in a hot tightening mode, wherein the most common hot tightening mode is to insert an electric heating rod into a central hole of the bolt, heat a screw rod to extend the bolt, and then rotate a nut so as to ensure that the pre-tightening reaches the designed value when the split bolt in the cylinder is installed.
Whether the split bolt in the cylinder is fastened in place is checked, and whether the elongation of the stretched bolt meets the design requirement is generally measured, or whether the elongation meets the design requirement is determined by setting the rotation angle of the nut. The pretightening force of bolt is confirmed through the angle of swivel nut to the split bolt in russian confession VVER unit steam turbine high pressure cylinder, has also provided the design value of bolt elongation, but because bolt structure reason, does not have suitable measuring tool to measure the bolt elongation after the heat is tight always, through nut rotation angle probably appear when the heat is tight the condition of many rotations a whole circle and not being discovered, the unit is opened and shut many times, split bolt also bears cold and hot alternating stress many times in the cylinder, lead to the bolt fracture. In a certain power plant, a fracture situation of the right side hot-tightening bolt of the middle split surface of the high-pressure inner cylinder is found in one overhaul, and suspected possibility of being caused by over-hot-tightening is possible. Therefore, the extension of the split bolt in the high-pressure cylinder should be measured after the split bolt is hot-tightened.
Usually, the elongation of the bolt is measured, generally by a special tool, the bolt is inserted into the central heating hole of the bolt and extends out of the end face of the bottom, the length of the whole bolt before and after pre-tightening is directly measured, and the difference is the elongation of the split bolt in the cylinder.
The lower measuring claw of the traditional measuring tool needs to extend to the lower part of the bolt to hook the lower end face, and the upper measuring claw tightly presses the upper end face of the bolt to measure the absolute length of the upper end face and the lower end face of the bolt; the bolt length measuring device has the disadvantages that measuring tools with corresponding lengths are required to be equipped according to different bolt lengths, the measuring tools are large, and the use and maintenance are inconvenient.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a steam turbine high pressure cylinder bolt elongation measuring tool, the elongation of accurate measuring bolt around hot tight ensures that the bolt pretightning force accords with the designing requirement, solves the on-the-spot former cylinder in the facet bolt probably have misoperation's the condition at the pretensioning in-process.
The utility model adopts the technical proposal that:
a tool for measuring the elongation of a bolt of a high-pressure cylinder of a steam turbine comprises a left lower pull rod connecting pin, a left supporting leg fixing shaft, a left measuring supporting leg, a left lower pull rod, a left pull rod connecting pin, a left upper pull rod connecting pin, a connecting sleeve, a stretching sleeve, a base, a limiting block, a compression spring, a cover cap, a stop screw, a screw plug, a connecting rod, a stretching sleeve connecting shaft, a connecting block, a right upper pull rod connecting pin, a right upper pull rod, a right pull rod connecting pin, a right lower pull rod, a right measuring supporting leg, a right supporting leg fixing shaft, a right lower pull rod connecting pin and a dial indicator;
the left lower pull rod is connected to the left measurement supporting leg through a left lower pull rod connecting pin, the lower end of the left upper pull rod is connected with the upper end of the left lower pull rod through a left pull rod connecting pin, and the upper end of the left upper pull rod is connected to the connecting block through a left upper pull rod connecting pin;
the right lower pull rod is connected to the right measurement supporting leg through a right lower pull rod connecting pin, the lower end of the right upper pull rod is connected with the upper end of the right lower pull rod through a right pull rod connecting pin, and the upper end of the right upper pull rod is connected to the connecting block through a right upper pull rod connecting pin;
the connecting block is positioned in a lower cavity of the connecting sleeve and can move up and down in the cavity; the left measuring supporting leg is connected with the connecting sleeve through a left supporting leg fixing shaft, and the right measuring supporting leg is connected with the connecting sleeve through a right supporting leg fixing shaft; the upper end of the sleeve is connected with the lower end of the connecting rod through threads, the middle of the sleeve is provided with an adjusting gasket I, the upper part of the connecting sleeve is sleeved with a stretching sleeve from the upper end of the connecting rod and is placed to the lowest part, and the stretching sleeve is combined with the connecting rod through a pulling sleeve connecting shaft; the connecting rod is connected with the connecting sleeve through threads, the thread part at the upper end of the connecting rod penetrates out of the base, and the limiting block is screwed at the upper end of the connecting rod through thread matching; the compression spring is arranged above the limiting block; the cover cap and the base are screwed together through threads, the screw plug is screwed in a threaded hole in the top of the cover cap through threads, the adjusting gasket II is installed in the middle of the screw plug, the dial indicator is installed in the hole of the screw plug, the pointer of the dial indicator abuts against the top of the connecting rod, and the dial indicator sleeve is tightly pressed by the aid of the rotary stop screw to fix the dial indicator.
Supporting leg fixed axle split pins are installed at two ends of the left supporting leg fixed axle and the right supporting leg fixed axle to prevent movement.
The top of the stretching sleeve is provided with a pulling sleeve hanging lug; and a pulling-up sleeve connecting shaft cotter pin I and a pulling-up sleeve connecting shaft cotter pin II are arranged at two ends of the pulling-up sleeve connecting shaft.
When the left side measuring supporting leg and the right side measuring supporting leg are in a horizontal opening state, the length of the left side measuring supporting leg and the right side measuring supporting leg is larger than the diameter of the bolt counter bore.
Compared with the prior art, the beneficial effects of the utility model reside in that:
(1) the utility model provides a measuring tool for the bolt elongation of a high-pressure cylinder of a steam turbine, which measures the upper end surface of a compression bolt of a supporting leg and the lower surface of a support to compress the upper surface of a cover nut to finish measurement, and has simple and convenient operation, more direct and simpler reading of a dial indicator and higher measuring speed;
(2) the utility model provides a measuring tool for the bolt elongation of a high-pressure cylinder of a steam turbine, structurally adopts a pressing connecting rod to enable a measuring supporting leg to rotate by taking a fixed shaft as an axis, so that the measuring supporting leg is tightly attached to a connecting sleeve and tightly presses the upper surface of the fixed shaft, the stress direction of the upper surface of the pressing bolt of the measuring supporting leg during measurement is consistent, no movable gap exists, and the measuring data is more accurate;
(3) the utility model provides a pair of steam turbine high pressure cylinder bolt elongation measuring tool, the maintenance check-up is more convenient: the absolute length does not need to be measured, the standard measuring tool does not need to be managed, the regular inspection is not needed, and only one dial indicator in the valid period needs to be selected when the dial indicator is used;
(4) the utility model provides a steam turbine high pressure cylinder bolt elongation measuring tool, only measure the distance between hood nut upper surface to the bolt upper surface, the measuring distance is short, is irrelevant with bolt length, and can adjust the measuring range, can satisfy the less difference of distance between different bolt hood nuts and screw rod tops; different bolts, even heating bolts of different units only need one tool, so that the problem that different bolts need to be provided with various tools is solved;
(5) the utility model provides a pair of steam turbine high pressure cylinder bolt elongation measuring tool, the range of application is wide, can be applied to thermal power plant, nuclear power plant's steam turbine to compensate the problem that a lot of unit heating bolt do not have the measurement elongation instrument.
Drawings
FIG. 1: the utility model provides a front view of a tool for measuring the elongation of a bolt of a high-pressure cylinder of a steam turbine;
FIG. 2: the utility model provides a left view of a measuring tool for the elongation of a bolt of a high-pressure cylinder of a steam turbine;
in the figure: 1-split bolt in high pressure cylinder; 2-a cap nut; 3, connecting a left lower pull rod with a pin; 4, supporting the foot fixing shaft at the left side; 5, measuring supporting feet on the left side; 6, a left lower pull rod; 7-left side pull rod connecting pin; 8, a left upper pull rod; 9-connecting pin of upper pull rod on left side; 10-connecting the sleeve; 11-adjusting a gasket I; 12-stretching the sleeve; 13-a base; 14, a limiting block; 15-a hold-down spring; 16-a cover; 17-a stop screw; 18-a plug screw; 19-a connecting rod; 20, connecting a shaft by a stretching sleeve; 21-connecting block; 22-right side upper tie bar connecting pin; 23-right upper pull rod; 24-right side tie rod connecting pin; 25-right side down-link; 26-right measurement leg support; 27-right side supporting leg fixing shaft; 28-right lower pull rod connecting pin; 29-a pull-up sleeve connecting shaft cotter pin I; 30-supporting foot fixed shaft cotter pin; 31-bolt counterbores; 32-bolt center hole; 33-a pull-up sleeve connecting shaft cotter pin II; 34-dial indicator; 35-upper surface of the bonnet nut; 36-hood nut central hole; 37-lower surface of base; 38-pulling up the sleeve hangers; 39-upper end surface of bolt; and 40-adjusting a gasket II.
Detailed Description
The following describes the tool for measuring the elongation of the bolt of the high-pressure cylinder of the steam turbine in detail with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1 and 2, the utility model provides a measuring tool for the elongation of a bolt of a high-pressure cylinder of a steam turbine, including a left side lower pull rod connecting pin 3, a left side supporting leg fixing shaft 4, a left side measuring supporting leg 5, a left side lower pull rod 6, a left side pull rod connecting pin 7, a left side upper pull rod 8, a left side upper pull rod connecting pin 9, a connecting sleeve 10, a stretching sleeve 12, a base 13, a limiting block 14, a compression spring 15, a cover cap 16, a stop screw 17, a screw plug 18, a connecting rod 19, a stretching sleeve connecting shaft 20, a connecting block 21, a right side upper pull rod connecting pin 22, a right side upper pull rod 23, a right side pull rod connecting pin 24, a right side lower pull rod 25, a right side measuring supporting leg 26, a right side supporting leg fixing shaft 27, a right side lower pull rod connecting;
the left lower pull rod 6 is connected to a left measurement supporting leg 5 through a left lower pull rod connecting pin 3, the lower end of the left upper pull rod 8 is connected with the upper end of the left lower pull rod 6 through a left pull rod connecting pin 7, and the upper end of the left upper pull rod 8 is connected to a connecting block 21 through a left upper pull rod connecting pin 9;
the right lower pull rod 25 is connected to the right measuring supporting foot 26 through a right lower pull rod connecting pin 28, the lower end of the right upper pull rod 23 is connected with the upper end of the right lower pull rod 25 through a right pull rod connecting pin 24, and the upper end of the right upper pull rod 23 is connected to the connecting block 21 through a right upper pull rod connecting pin 22;
the connecting block 21 is positioned in a lower cavity of the connecting sleeve 10 and can move up and down in the cavity; the left measuring supporting foot 5 is connected with the connecting sleeve 10 through a left supporting foot fixing shaft 4, and the right measuring supporting foot 26 is connected with the connecting sleeve 10 through a right supporting foot fixing shaft 27;
the supporting foot fixing shaft cotter pins 30 are arranged at the two ends of the left supporting foot fixing shaft 4 and the right supporting foot fixing shaft 27 to prevent the movement;
the upper end of the sleeve 10 is connected with the lower end of the connecting rod 19 through threads, the middle of the sleeve is provided with an adjusting gasket I11, the stretching sleeve 12 is sleeved on the upper part of the connecting sleeve 10 from the upper end of the connecting rod 19 and is placed to the lowest part, the stretching sleeve 12 is combined with the connecting block 21 through a stretching sleeve connecting shaft 20, and the top of the stretching sleeve 12 is provided with a stretching sleeve hanging lug 38; and a pulling-up sleeve connecting shaft cotter pin I29 and a pulling-up sleeve connecting shaft cotter pin II 33 are arranged at two ends of the pulling-up sleeve connecting shaft 20.
The upper end thread part of the connecting rod 19 penetrates out of the base 13, and the limiting block 14 is screwed at the upper end of the connecting rod 19 through thread matching;
the compression spring 15 is placed above the limiting block 14; the cover 16 is screwed to the base 13,
the screw plug 18 is screwed in a threaded hole at the top of the cover cap 16 through threads, an adjusting gasket II 40 is arranged in the middle,
the dial indicator 34 is arranged in a hole of the screw plug 18, an indicator of the dial indicator 34 is propped against the top of the connecting rod 19, and the dial indicator 34 is tightly pressed by rotating the stop screw 17 to fix the dial indicator.
The left measurement support foot 5 and the right measurement support foot 26 are in a horizontally opened state, and the length thereof is longer than the diameter of the bolt counterbore 31.
After the hot-tightening bolt elongation measuring tool is assembled, the tool is adjusted according to the actually measured distance between the top of the bolt and the top of the cover nut, so that the measuring depth can meet the requirement of measuring data of all bolts before and after hot tightening.
The method comprises the following steps: it is checked that all the cap nuts 2 have been screwed onto the bolts 1, that they have been preliminarily fastened, that all the bolts have been in a state of waiting for hot-tightening, and that the cylinder mid-split clearance has been eliminated.
Step two: lifting and stretching the sleeve hanging lug 38 to enable the left measuring supporting foot 5 and the right measuring supporting foot 26 to be in a vertical closing state, extending a measuring tool into the hood nut central hole 36, then pressing and stretching the sleeve hanging lug 38 downwards to enable the left measuring supporting foot 5 and the right measuring supporting foot 26 to be in a horizontal opening state, confirming that the lengths of the left measuring supporting foot 5 and the right measuring supporting foot 26 are larger than the diameter of the bolt counter bore 31 and cling to the upper end face 39 of the bolt, and checking the gap between the upper surface 35 of the hood nut and the lower surface 37 of the base; and a plurality of bolts were checked in the same manner.
Step three: according to the condition of the inspection in the second step, the thickness of the spacer I11 is adjusted to ensure that the clearance between the upper surface 35 of the cap nut and the lower surface 37 of the base is at least 5 mm. Before adjustment, the connecting shaft 20 of the pulling-up sleeve is drawn out, the connection between the pulling sleeve 12 and the connecting block 21 is released, and the pulling sleeve 12 is put at the lowest part
Step four: and (3) loosening the stop screw 17 of the dial indicator 2, adjusting the insertion depth of the pointer of the dial indicator 2, rotating the stop screw 17 for fixing when the maximum value is 1mm, and rotating the dial plate to enable the pointer of the dial plate to be at 0 position.
Step five: checking to confirm the screwing of the thread between the base 13 and the cover 16, and checking to confirm the screwing of the thread between the connecting sleeve 10 and the connecting rod 19; pulling the pulling sleeve hanging lug 38 upwards and downwards, and whether the left measuring supporting leg 5 and the right measuring supporting leg 26 are opened flexibly or not; checking whether the lower limit of the pulling sleeve hanging lug 38 is higher than the lower surface of the base 13; and checking that the measuring tool is adjusted.
After the measuring tool is assembled and adjusted, the elongation of the bolt can be measured, in order to reduce the measuring error, the positions of the left measuring supporting leg 5 and the right measuring supporting leg 26 on the upper end surface 39 of the bolt are kept consistent before and after hot tightening, and the measuring steps are as follows:
step six: measuring the initial relative height of the bolt before tightening, lifting and stretching the sleeve hanger 38 to enable the left measuring supporting leg 5 and the right measuring supporting leg 26 to be in a vertical closing state, and extending a measuring tool into the central hole 36 of the bonnet nut, as shown in fig. 2; and then the stretching sleeve hanging lug 38 is pressed downwards to enable the left measuring supporting leg 5 and the right measuring supporting leg 26 to be in a horizontal open state, as shown in fig. 1, the left measuring supporting leg 5 and the right measuring supporting leg 26 are tightly attached to the upper end surface 39 of the bolt, the cover cap 16 is tightly held and pressed downwards to drive the dial indicator 2 to move downwards until the lower surface 37 of the base is tightly attached to the upper surface 35 of the cap nut, and the reading of the dial indicator is checked and recorded according to the number.
Step seven: all bolts before hot-fastening were measured as described above and the readings were recorded by number.
Step eight: and heating the bolts by using an electric heating rod to finish the final fastening of all the bolts.
Step nine: and when the temperature of the bolts is recovered to normal temperature, repeating the step six, measuring data of all the bolts subjected to hot tightening, wherein the obtained data is the relative height of the bolts subjected to hot tightening and is recorded according to the number.
Step nine: and (4) calculating the elongation, namely subtracting the relative height of the bolt before hot tightening from the relative height of the bolt after hot tightening, namely obtaining the elongation of the hot-tightened bolt.
Note that point 1: before each bolt measurement, a lower dial gauge reading is checked for initial 0.
Note that point 2: the temperature-induced elongation of the bolt should be considered when measuring the relative height of the bolt after hot-fastening, and when the temperature of the bolt is restored to the state before hot-fastening, or when calculating the elongation.
Note that point 3: during the measurement process, the threaded part and the dial indicator of the measuring tool cannot be rotated, otherwise the measurement result is influenced.
The above description is only the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art can substitute or change the technical solution of the present invention and the inventive concept thereof equally within the technical scope disclosed in the present invention, and all the modifications should be covered within the protection scope of the present invention.
Claims (4)
1. The utility model provides a steam turbine high pressure cylinder bolt elongation measuring tool which characterized in that: the device comprises a left lower pull rod connecting pin (3), a left supporting leg fixing shaft (4), a left measuring supporting leg (5), a left lower pull rod (6), a left pull rod connecting pin (7), a left upper pull rod (8), a left upper pull rod connecting pin (9), a connecting sleeve (10), a stretching sleeve (12), a base (13), a limiting block (14), a compression spring (15), a cover cap (16), a stop screw (17), a screw plug (18), a connecting rod (19), a stretching sleeve connecting shaft (20), a connecting block (21), a right upper pull rod connecting pin (22), a right upper pull rod (23), a right pull rod connecting pin (24), a right lower pull rod (25), a right measuring supporting leg (26), a right supporting leg fixing shaft (27), a right lower pull rod connecting pin (28) and a dial indicator (34);
the left lower pull rod (6) is connected to the left measuring supporting leg (5) through a left lower pull rod connecting pin (3), the lower end of the left upper pull rod (8) is connected with the upper end of the left lower pull rod (6) through a left pull rod connecting pin (7), and the upper end of the left upper pull rod (8) is connected to the connecting block (21) through a left upper pull rod connecting pin (9);
the right lower pull rod (25) is connected to the right measuring supporting leg (26) through a right lower pull rod connecting pin (28), the lower end of the right upper pull rod (23) is connected with the upper end of the right lower pull rod (25) through a right pull rod connecting pin (24), and the upper end of the right upper pull rod (23) is connected to the connecting block (21) through a right upper pull rod connecting pin (22);
the connecting block (21) is positioned in a lower cavity of the connecting sleeve (10) and can move up and down in the cavity; the left measuring supporting foot (5) is connected with the connecting sleeve (10) through a left supporting foot fixing shaft (4), and the right measuring supporting foot (26) is connected with the connecting sleeve (10) through a right supporting foot fixing shaft (27); the upper end of the sleeve (10) is connected with the lower end of the connecting rod (19) through threads, the middle of the sleeve is provided with an adjusting gasket I (11), the stretching sleeve (12) is sleeved on the upper part of the connecting sleeve (10) from the upper end of the connecting rod (19) and is placed to the lowest part, and the stretching sleeve (12) is combined with the connecting block (21) through a stretching sleeve connecting shaft (20); the connecting rod (19) is connected with the connecting sleeve (10) through threads, the thread part at the upper end of the connecting rod (19) penetrates out of the base (13), and the limiting block (14) is screwed at the upper end of the connecting rod (19) through thread matching; the compression spring (15) is placed above the limiting block (14); the cover cap (16) and the base (13) are screwed together through threads, the screw plug (18) is screwed in a threaded hole in the top of the cover cap (16) through threads, the middle of the screw plug is provided with an adjusting gasket II (40), the dial indicator (34) is arranged in the hole of the screw plug (18), the pointer of the dial indicator (34) is pressed against the top of the connecting rod (19), the dial indicator sleeve (34) is pressed by rotating the stop screw (17), and the dial indicator (34) is fixed.
2. The tool of claim 1 for measuring the bolt elongation of the high pressure cylinder of a steam turbine, wherein: supporting leg fixed axle cotter pins (30) are installed at two ends of the left supporting leg fixed axle (4) and the right supporting leg fixed axle (27) to prevent movement.
3. The tool according to claim 2, wherein the tool comprises: the top of the stretching sleeve (12) is provided with a pulling sleeve hanging lug (38); and a pulling-up sleeve connecting shaft cotter pin I (29) and a pulling-up sleeve connecting shaft cotter pin II (33) are arranged at two ends of the pulling sleeve connecting shaft (20).
4. The tool according to claim 3, wherein the tool comprises: when the left side measuring supporting foot (5) and the right side measuring supporting foot (26) are in a horizontal opening state, the length of the left side measuring supporting foot and the right side measuring supporting foot is larger than the diameter of the bolt counter bore (31).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021307893.1U CN212963105U (en) | 2020-07-06 | 2020-07-06 | Instrument for measuring bolt elongation of high-pressure cylinder of steam turbine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021307893.1U CN212963105U (en) | 2020-07-06 | 2020-07-06 | Instrument for measuring bolt elongation of high-pressure cylinder of steam turbine |
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| Publication Number | Publication Date |
|---|---|
| CN212963105U true CN212963105U (en) | 2021-04-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021307893.1U Active CN212963105U (en) | 2020-07-06 | 2020-07-06 | Instrument for measuring bolt elongation of high-pressure cylinder of steam turbine |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111811364A (en) * | 2020-07-06 | 2020-10-23 | 江苏核电有限公司 | Tool and method for measuring bolt elongation of high-pressure cylinder of steam turbine |
| CN111811364B (en) * | 2020-07-06 | 2024-05-14 | 江苏核电有限公司 | Tool and method for measuring bolt elongation of high-pressure cylinder of steam turbine |
-
2020
- 2020-07-06 CN CN202021307893.1U patent/CN212963105U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111811364A (en) * | 2020-07-06 | 2020-10-23 | 江苏核电有限公司 | Tool and method for measuring bolt elongation of high-pressure cylinder of steam turbine |
| CN111811364B (en) * | 2020-07-06 | 2024-05-14 | 江苏核电有限公司 | Tool and method for measuring bolt elongation of high-pressure cylinder of steam turbine |
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