CN212585672U - Steam turbine main steam valve bonnet bolt elongation measuring device - Google Patents
Steam turbine main steam valve bonnet bolt elongation measuring device Download PDFInfo
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- CN212585672U CN212585672U CN202022000019.XU CN202022000019U CN212585672U CN 212585672 U CN212585672 U CN 212585672U CN 202022000019 U CN202022000019 U CN 202022000019U CN 212585672 U CN212585672 U CN 212585672U
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Abstract
The utility model relates to a steam turbine main steam valve gap bolt extension measuring device for the degree of depth of main steam valve gap bolt centre bore around measuring tensile calculates the extension volume of centre bore, and then calculates the extension volume of steam turbine main steam valve gap bolt, measuring device includes measuring head and degree of depth chi, degree of depth chi and measuring head are connected, the measuring head is used for stretching into main steam valve gap bolt's centre bore, the degree of depth chi is used for measuring the degree of depth of main steam valve gap bolt's centre bore. Compared with the prior art, the utility model discloses a structure that device adopted depth gauge and measuring head to combine together ensures that the measuring position can not change, and it is convenient to measure. And calculating the elongation of the bolt according to the difference of the two measurement data. The utility model discloses a device measurement is convenient, eliminates and disturbs, can measure at any time as required to carry out measurement, the verification of bolt elongation.
Description
Technical Field
The utility model relates to a bolt elongation measuring tool especially relates to a steam turbine main steam valve gap bolt elongation measuring device.
Background
A nuclear turbine is one of the most critical devices of a nuclear power plant or a nuclear power plant. The new steam is saturated steam or slightly superheated steam containing trace moisture. For high temperature gas cooled reactor nuclear power plants and fast neutron breeder nuclear power plants, the new steam parameters are approximately the same as the superheated steam parameters of conventional high pressure thermal power plants, so that conventional steam turbines for thermal power generation can be directly adopted.
The main steam valve of the steam turbine is a valve which enables main steam to enter the steam turbine and can be closed quickly. The protective mechanism is used for protecting the steam turbine in emergency operation.
Before and after the main steam valve of the steam turbine is overhauled, a flange bolt of a valve cover of the main steam valve needs to be disassembled and fastened. Because the pressure and temperature parameters of the medium flowing in the main steam valve are very high, in order to guarantee smooth detachment and fastening of the flange bolts, guarantee tightness of the valve after the flange bolts are fastened and improve safety performance, on one hand, a hydraulic stretcher needs to be used for stretching the flange bolts, and on the other hand, a bolt elongation measuring tool needs to be used for measuring the elongation of the flange bolts.
Chinese patent CN208059748U discloses a tool for measuring the elongation of flange bolts of main steam valves of steam turbines. The measuring tool for the elongation of the flange bolt of the main steam valve of the steam turbine comprises a measuring head, a measuring rod, a main sleeve, a seal head sleeve, a compression spring, a support sleeve, a fixed sleeve, a locking bolt and a dial indicator; wherein, the center of the right end surface of the measuring head is provided with a threaded concave hole; the left end of the side surface of the measuring rod is provided with a thread, and the left end of the measuring rod is screwed in the threaded concave hole; the left part of the side surface of the measuring rod is provided with a measuring rod annular boss; the left end of the inner side surface of the main sleeve is in clearance fit with the side surface of the annular boss of the measuring rod; the left part of the inner side surface of the main sleeve is provided with a main sleeve annular boss; the side surface of the main sleeve annular boss is in clearance fit with the left part of the side surface of the measuring rod. The method is suitable for overhauling the main steam valve of the steam turbine of the power plant. However, the device has a complex structure and is inconvenient to use.
However, the main steam valve of the steam turbine of some nuclear power plants or nuclear power plants is of a horizontal structure, and the existing valve cover bolt stretching measuring tool has large measuring data error and complicated adjusting process in use, so that the measuring result is distorted and the workload is increased.
The tool for measuring the elongation of the main steam valve bolt on site has the advantages that the position change condition of the measuring rod cannot be determined when the length of the bolt changes, and the measuring rod is superposed with the radial deformation of the bolt to cause unqualified measuring results. The number of bolts is large, and the tensioner and the measuring tool need to be disassembled when the bolt tensioner is transferred every time, so that the workload is increased. The measuring tool needs to be assembled with the stretcher, and the bolt elongation can not be checked at any time according to the requirement.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a steam turbine main steam valve gap bolt extension measuring device in order to solve the defect that current measuring tool exists.
The utility model discloses a measuring device is applicable to the high measurement of required precision such as the horizontal main steam valve gap bolt tensile quantity of steam turbine.
The purpose of the utility model can be realized through the following technical scheme:
the utility model provides a steam turbine main steam valve gap bolt extension measuring device for the degree of depth of main steam valve gap bolt centre bore around measuring tensile calculates the extension volume of centre bore, and then calculates the extension volume of steam turbine main steam valve gap bolt, measuring device includes measuring head and degree of depth chi, degree of depth chi and measuring head are connected, the measuring head is used for stretching into main steam valve gap bolt's centre bore, the degree of depth chi is used for measuring the degree of depth of main steam valve gap bolt's centre bore.
Furthermore, the head end of the measuring head is a spherical surface and is adapted to the bottom of the central hole of the valve cover bolt of the main steam valve. Offer the head end of measuring head for the sphere, be favorable to adapting to with the machining shape of the centre bore bottom of main steam valve gap bolt, can both support the bottom of centre bore at every turn like this, make the accurate difficult change of measuring basis, and also can not deepen the centre bore bottom if offer into planar structure with the head end of measuring head, lead to measuring accuracy not high, if open the head end of measuring head and establish into most advanced, insert the position that the centre bore is not the least end easily, it is different to measure the basis when equally can lead to measuring many times, and then lead to measuring accuracy not high.
Furthermore, the measuring head is integrally cylindrical and is matched with the central hole of the main steam valve cover bolt, and the measuring head can easily enter the central hole of the main steam valve cover bolt.
Furthermore, the diameter of the measuring head cylinder is 0.8-0.9 times of the inner diameter of the central hole of the valve cover bolt of the main steam valve. The size design enables the diameter size of the measuring head cylinder to be matched with the inner diameter size of the central hole of the main steam valve cover bolt, so that the measuring head can conveniently enter, and the measuring head is unlikely to have too small size to cause the inclined condition and further influence the measuring precision.
Furthermore, the width of the depth gauge is smaller than or equal to the outer diameter of the measuring head and is also smaller than the inner diameter of the central hole of the valve cover bolt of the main steam valve, so that the depth gauge can also extend into the central hole of the valve cover bolt of the main steam valve, and further measurement is realized.
Furthermore, the depth gauge and the measuring head are detachably connected, and the connecting positions of the depth gauge and the measuring head are the same each time.
Furthermore, a groove and a fastening hole are formed in the side face of the measuring head, the depth gauge is inserted into the groove, the inner hexagonal screw penetrates through the fastening hole to achieve connection of the depth gauge and the measuring head, and the depth gauge is located in the direction in which the axis of the measuring head extends.
Further, the depth direction of the groove extends from the side surface of the measuring head to a position passing through the central axis of the measuring head, and the length direction of the groove extends from the end of the measuring head to a position close to the spherical surface of the head of the measuring head.
Further, the fastening holes extend from the side surface of the measuring head to the grooves, and communication with the grooves is achieved.
Further, the fastening hole sets up two at least, and the interval sets up to realize the firm connection of depth gauge and measuring head through two at least fixed points and can not rock or become flexible and lead to measurement accuracy to be influenced.
Further, the measuring head is a machined structural member. The measuring head can be manufactured at any time according to the on-site requirement, and the type of the depth gauge is selected so as to be suitable for the sizes of various bolt holes. The measuring head and the ruler body are fastened into a whole through the locking screws, the measuring head can be detached from the ruler body, the whole set of tool is high in universality, and the use is more convenient.
The utility model also provides a steam turbine main steam valve gap bolt extension measuring device application method, including following step:
during measurement, a depth gauge is inserted into the measuring head through a groove on the side surface of the measuring head, the measuring head is locked by using a hexagon socket head cap screw, and then the measuring head and the depth gauge are placed into a central hole of a valve cover bolt of a main steam valve of a steam turbine together to measure the depth of the central hole before stretching;
then taking out the measuring device;
stretching the valve cover bolt of the main steam valve of the steam turbine by using bolt stretching, taking down a bolt stretcher after the bolt stretching is finished, inserting a depth gauge into a measuring head through a groove on the side surface of the measuring head, locking the depth gauge by using a hexagon socket head cap screw, then putting the depth gauge into a central hole of the stretched valve cover bolt of the main steam valve of the steam turbine together, and measuring the depth of the stretched central hole;
the elongation of the central hole of the valve cover bolt of the main steam valve before and after stretching is calculated according to the difference of the measured data at the two sides,
the stretching amount of the bolt is calculated by the measured elongation of the core hole before and after stretching.
Compared with the prior art, the utility model discloses a structure that device adopted depth gauge and measuring head to combine together ensures that the measuring position can not change, and it is convenient to measure. And calculating the elongation of the bolt according to the difference of the two measurement data. The utility model discloses a device measurement is convenient, eliminates and disturbs, can measure at any time as required to carry out measurement, the verification of bolt elongation.
Drawings
FIG. 1 is a schematic structural diagram of a device for measuring the bolt elongation of a valve cover of a main steam valve of a steam turbine in embodiment 1;
FIG. 2 is a schematic front view showing the structure of a measuring head in example 1;
FIG. 3 is a schematic side view of a measuring head of example 1.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
Examples
Referring to fig. 1 to 3, the measuring device for the elongation of the valve cover bolt of the main steam valve of the steam turbine is used for measuring the depth of the central hole of the valve cover bolt of the main steam valve before and after stretching, calculating the elongation of the central hole and further calculating the elongation of the valve cover bolt of the main steam valve of the steam turbine, the measuring device comprises a measuring head 1 and a depth ruler 2, the depth ruler 2 is connected with the measuring head 1, the measuring head 1 is used for stretching into the central hole of the valve cover bolt of the main steam valve, and the depth ruler 2 is used for measuring the depth of the central hole of the valve cover bolt of the main.
In this embodiment, the head end of the measuring head 1 is a spherical surface, and is adapted to the bottom of the central hole of the valve cover bolt of the main steam valve. Offer the head end of measuring head 1 for the sphere, be favorable to suiting with the processing shape of the centre bore bottom of main steam valve gap bolt, can both support the bottom of centre bore at every turn like this, make the accurate difficult change of measuring basis, and if open the head end of measuring head 1 and establish into planar structure also can not deepen the centre bore bottom, lead to measuring accuracy not high, if open the head end of measuring head 1 and establish into most advanced, insert the position that the centre bore is not the least end easily, it is different to measure the basis when equally can lead to measuring many times, and then lead to measuring accuracy not high.
In this embodiment, the measuring head 1 is a cylinder, is adapted to the central hole of the valve cover bolt of the main steam valve, and is easy to enter the central hole of the valve cover bolt of the main steam valve. The diameter of the cylinder of the measuring head 1 is 0.8-0.9 times of the inner diameter of the central hole of the valve cover bolt of the main steam valve. The size design enables the diameter size of the cylinder of the measuring head 1 to be matched with the inner diameter size of the central hole of the valve cover bolt of the main steam valve, the measuring head 1 can conveniently enter the measuring head, and the measuring head 1 cannot be too small in size to cause the inclination of the measuring head and further affect the measuring precision.
In this embodiment, the width of the depth gauge 2 is smaller than or equal to the outer diameter of the measuring head 1, and is also smaller than the inner diameter of the central hole of the valve cover bolt of the main steam valve, so that the depth gauge 2 can also extend into the central hole of the valve cover bolt of the main steam valve, and further measurement is realized.
In this embodiment, the depth gauge 2 and the measuring head 1 are detachably connected, and the positions of connection are the same each time.
In this embodiment, a groove 11 and a fastening hole 12 are formed in the side surface of the measuring head 1, the depth gauge 2 is inserted into the groove 11, and the hexagon socket head cap screw penetrates through the fastening hole 12 to connect the depth gauge 2 and the measuring head 1, and the depth gauge 2 is located in the direction in which the axis of the measuring head 1 is extended. The depth direction of the groove 11 extends from the side of the measuring head 1 to a position passing through the central axis of the measuring head 1, and the length direction of the groove 11 extends from the end of the measuring head 1 to a position close to the spherical surface of the head of the measuring head 1. The fastening holes 12 extend from the side of the measuring head 1 to the recess 11, enabling communication with the recess 11. The fastening holes 12 are arranged at least two at intervals, so that the depth gauge 2 is stably connected with the measuring head 1 through at least two fixing points, and the measuring precision is not affected due to shaking or loosening.
In this embodiment, the measuring head 1 is a machined structural member. The measuring head can be manufactured at any time according to the on-site requirement, and the type of the depth gauge is selected so as to be suitable for the sizes of various bolt holes. The measuring head and the ruler body are fastened into a whole through the locking screws, the measuring head can be detached from the ruler body, the whole set of tool is high in universality, and the use is more convenient.
The embodiment also provides a use method of the device for measuring the elongation of the bolt of the valve cover of the main steam valve of the steam turbine, which comprises the following steps:
during measurement, a depth gauge is inserted into the measuring head through a groove on the side surface of the measuring head, the measuring head is locked by using a hexagon socket head cap screw, and then the measuring head and the depth gauge are placed into a central hole of a valve cover bolt of a main steam valve of a steam turbine together to measure the depth of the central hole before stretching;
then taking out the measuring device;
stretching the valve cover bolt of the main steam valve of the steam turbine by using bolt stretching, taking down a bolt stretcher after the bolt stretching is finished, inserting a depth gauge into a measuring head through a groove on the side surface of the measuring head, locking the depth gauge by using a hexagon socket head cap screw, then putting the depth gauge into a central hole of the stretched valve cover bolt of the main steam valve of the steam turbine together, and measuring the depth of the stretched central hole;
the elongation of the central hole of the valve cover bolt of the main steam valve before and after stretching is calculated according to the difference of the measured data at the two sides,
the stretching amount of the bolt is calculated by the measured elongation of the core hole before and after stretching.
The embodiments described above are intended to facilitate the understanding and use of the invention by those skilled in the art. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should make improvements and modifications within the scope of the present invention according to the disclosure of the present invention.
Claims (10)
1. A measuring device for the elongation of a bolt of a valve cover of a main steam valve of a steam turbine is characterized in that,
is used for measuring the depth of the central hole of the valve cover bolt of the main steam valve before and after stretching, calculating the elongation of the central hole and further calculating the elongation of the valve cover bolt of the main steam valve of the steam turbine,
the measuring device comprises a measuring head (1) and a depth gauge (2), the depth gauge (2) is connected with the measuring head (1),
the measuring head (1) is used for extending into a center hole of the main steam valve cover bolt, and the depth ruler (2) is used for measuring the depth of the center hole of the main steam valve cover bolt.
2. The steam turbine main steam valve cover bolt elongation measuring device according to claim 1, characterized in that the head end of the measuring head (1) is spherical for fitting with the bottom of the center hole of the main steam valve cover bolt.
3. The steam turbine main steam valve cover bolt elongation measuring device according to claim 1, characterized in that the measuring head (1) is generally cylindrical and adapted to a central hole of a main steam valve cover bolt.
4. The steam turbine main steam valve cover bolt elongation measuring device according to claim 3, characterized in that the diameter of the measuring head (1) cylinder is 0.8-0.9 times the inner diameter of the main steam valve cover bolt central hole.
5. The steam turbine main steam valve cover bolt elongation measuring device according to claim 3, characterized in that the width of the depth gauge (2) is less than or equal to the outer diameter of the measuring head (1).
6. The steam turbine main steam valve cover bolt elongation measuring device according to claim 1, characterized in that the depth gauge (2) and the measuring head (1) are detachably connected, and the connecting position is the same each time.
7. The steam turbine main steam valve cover bolt elongation measuring device according to claim 1, characterized in that a groove (11) and a fastening hole (12) are formed in the side surface of the measuring head (1), the depth gauge (2) is inserted into the groove (11), a hexagon socket head cap screw penetrates through the fastening hole (12) to achieve connection of the depth gauge (2) and the measuring head (1), and the depth gauge (2) is located in the direction in which the axis of the measuring head (1) extends.
8. The steam turbine main steam valve cover bolt elongation measuring device according to claim 7, characterized in that the depth direction of the groove (11) extends from the side of the measuring head (1) to a position passing through the central axis of the measuring head (1), and the length direction of the groove (11) extends from the end of the measuring head (1) to a position close to the spherical surface of the head of the measuring head (1).
9. The steam turbine main steam valve cover bolt elongation measuring device according to claim 7, characterized in that the fastening hole (12) extends from the side of the measuring head (1) to the groove (11) to communicate with the groove (11).
10. The steam turbine main steam valve cover bolt elongation measuring device according to claim 7, characterized in that the fastening holes (12) are arranged at least two and spaced apart.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022000019.XU CN212585672U (en) | 2020-09-14 | 2020-09-14 | Steam turbine main steam valve bonnet bolt elongation measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022000019.XU CN212585672U (en) | 2020-09-14 | 2020-09-14 | Steam turbine main steam valve bonnet bolt elongation measuring device |
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| Publication Number | Publication Date |
|---|---|
| CN212585672U true CN212585672U (en) | 2021-02-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022000019.XU Active CN212585672U (en) | 2020-09-14 | 2020-09-14 | Steam turbine main steam valve bonnet bolt elongation measuring device |
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|---|---|
| CN (1) | CN212585672U (en) |
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2020
- 2020-09-14 CN CN202022000019.XU patent/CN212585672U/en active Active
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