CN112097604B - Through-flow clearance measurement system and device for generator end assembly - Google Patents
Through-flow clearance measurement system and device for generator end assembly Download PDFInfo
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- CN112097604B CN112097604B CN202010836525.4A CN202010836525A CN112097604B CN 112097604 B CN112097604 B CN 112097604B CN 202010836525 A CN202010836525 A CN 202010836525A CN 112097604 B CN112097604 B CN 112097604B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
- G01B5/14—Measuring arrangements characterised by the use of mechanical techniques for measuring distance or clearance between spaced objects or spaced apertures
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
- G01B5/0002—Arrangements for supporting, fixing or guiding the measuring instrument or the object to be measured
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Abstract
The invention discloses a through-flow clearance measuring system and a device for a generator end assembly, the system comprises the generator end assembly and a through-flow clearance measuring device, the generator end assembly comprises a static blade seat and a rotor, a plurality of measuring holes are formed in the static blade seat, and a plurality of moving blades are circumferentially distributed on the rotor; the through-flow gap measuring device comprises a shell cover which is of a cylindrical structure with one end closed and the other end opened; the mounting screw thread piece is used for fixedly mounting the shell cover on the corresponding measuring hole; the telescopic component is used for obtaining through-flow clearance data of the current measuring hole when the telescopic rod extends to contact the end part of the moving blade; and the power assembly can provide power for extending or retracting the telescopic rod. In the through-flow clearance measuring system and device for the generator terminal assembly, the power assembly supplies power to the telescopic assembly, so that the telescopic assembly can be extended or retracted controllably, data measurement is facilitated, the moving blade can be protected, and the moving blade is prevented from being damaged in the measuring process.
Description
Technical Field
The invention relates to the technical field of large-scale generator maintenance, in particular to a through-flow gap measuring system and device for a generator terminal assembly.
Background
At present, more large-scale steam turbine generators are cooled by axial ventilation multistage axial flow fans. The static blade seats are distributed along the circumference of the rotor. During overhaul and assembly, the radial clearance between the moving blade and the stationary blade seat needs to be checked, measured and adjusted. When the generator is overhauled, the operation space is narrow, the field environment is complex, and the measurement difficulty is very high. Especially, when measuring the radial clearance of the moving blade and the static blade, a measurer cannot observe the measuring hole, only can stretch hands into a hand hole on a wind shield of the base by feeling to carry out groping measurement, and can only gently push a mechanical depth gauge measuring rod to carry out measurement due to the fact that a rigid mechanical measuring device hurts the moving blade. Moreover, measurement needs to be repeated to ensure the accuracy of data, and in the process of gap adjustment, any adjustment changes the gaps of all measuring points, so that repeated measurement and verification need to be performed again, which is time-consuming and labor-consuming. Most generators all use the mechanical ruler to measure about the clearance measurement, and the mechanical ruler afterbody all has with flexible head rigid connection or flexible or the mechanism of translation, brings very big inconvenience for data measurement to there is the risk that causes the damage to generator parts too hard.
Patent CN201811628846 discloses a hydraulic generator group clearance measuring tool, and measuring tool includes main scale, vernier scale, locking screw and a pair of measurement claw, measure the claw respectively integrative setting in main scale and vernier scale's head one side and mutual symmetry, locking screw is used for the position of fixed vernier scale, the measuring tool range is at 0-50mm within range. Therefore, the measuring tool still has a sliding mechanical part which is not less than 50mm and occupies a large space. And the measuring device needs manual operation and does not have the function of automatic telescopic measurement.
Disclosure of Invention
The present invention is directed to a system and a device for measuring a through-flow gap of a generator end assembly.
The technical scheme adopted by the invention for solving the technical problems is as follows: the through-flow clearance measuring system for the end component of the generator comprises a generator end component and a plurality of through-flow clearance measuring devices, wherein the generator end component comprises a static blade seat and a rotor arranged in the static blade seat, a plurality of measuring holes are formed in the static blade seat, and a plurality of moving blades are distributed on the circumference of the rotor; the plurality of through-flow gap measuring devices are arranged on the plurality of measuring holes in a one-to-one correspondence manner; the through-flow gap measuring device comprises
The shell cover is of a cylindrical structure with one end closed and the other end opened;
the mounting threaded part is arranged at the opening end of the shell and forms a body part of the through-flow clearance measuring device together with the shell, a cavity is formed in the body part, and the mounting threaded part is provided with a central guide hole;
the telescopic component is arranged in the cavity and used for measuring the displacement change of a telescopic rod which can selectively move back and forth along the axial direction of the shell cover and obtaining the through-flow clearance data of the current measuring hole when the telescopic rod extends to contact the end part of the moving blade, and the telescopic rod is arranged on the central guide hole of the mounting threaded part in a penetrating way;
the power assembly is connected with the telescopic rod and can provide power for extending or retracting the telescopic rod.
Preferably, the telescopic assembly further comprises a static grid ruler and a movable grid ruler, the static grid ruler is fixedly arranged on the housing, the movable grid ruler is arranged in parallel with the static grid ruler, the movable grid ruler is connected with the telescopic rod and moves along with the movement of the telescopic rod, so that a relative displacement is generated between the movable grid ruler and the static grid ruler, and when the telescopic rod extends to contact with the end of the movable blade, the maximum relative displacement between the movable grid ruler and the static grid ruler is the through-flow gap data.
Preferably, the power assembly comprises a tension spring, a knob and a pull wire; the tension spring is positioned in the cavity, a first end of the tension spring is fixedly arranged on the mounting threaded part, and a second end of the tension spring is connected with the telescopic rod; the knob is annular and is sleeved on the periphery of the shell; the first end of the pull wire is connected with the second end of the tension spring, and the second end of the pull wire is connected with the knob; in the clockwise or anticlockwise rotating state of the knob, the pull wire is pulled out or pulled back, so that the telescopic rod is driven to extend or retract.
Preferably, the power assembly further comprises a guide ring and a threading hole, the guide ring is fixedly arranged in the shell cover, and the threading hole is formed in the shell cover; the second end of the pull wire sequentially penetrates through the guide ring and the threading hole to be connected to the knob.
Preferably, the number of the through-flow clearance measuring devices and the number of the measuring holes are at least one, and the at least one measuring hole is uniformly arranged on the static blade seat at intervals.
Preferably, the number of the through-flow gap measuring devices and the number of the measuring holes are both one.
Preferably, the through-flow gap measuring device further comprises a data acquisition assembly for acquiring the through-flow gap data measured by all the through-flow gap measuring devices.
Preferably, the through-flow gap measuring device further comprises a display component connected with the data acquisition component and used for displaying all the through-flow gap data.
Preferably, the through-flow gap measuring system for the generator end assembly further includes a background receiving device, and the through-flow gap measuring device further includes a transmission assembly, and the transmission assembly is connected with the data acquisition assembly, and receives and sends the through-flow gap data to the background receiving device.
A through-flow clearance measuring device is also provided, and the through-flow clearance measuring device comprises the through-flow clearance measuring device.
The beneficial effects of the implementation of the invention are as follows: in the through-flow clearance measuring system and device for the generator end assembly, the power assembly provides power for the telescopic assembly, so that the telescopic assembly can be extended or retracted controllably, data measurement is facilitated, the moving blade can be protected, and the moving blade is prevented from being damaged in the measuring process.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a schematic illustration of a through-flow clearance measurement system for a generator end assembly in some embodiments of the invention;
FIG. 2 is a schematic view of the connection of a generator end assembly and a through-flow clearance measurement device in accordance with certain embodiments of the invention;
FIG. 3 is a schematic structural view of the generator end assembly of FIG. 2;
FIG. 4 is an enlarged view of a portion of FIG. 3;
FIG. 5 is a schematic view of FIG. 4 with the through-flow gap measurement device installed;
FIG. 6 is a schematic view of a flow gap measurement device according to some embodiments of the invention;
FIG. 7 is a cross-sectional view of FIG. 6 at the guide ring location;
fig. 8 is a cross-sectional view of a flow gap measuring device at the position of a guide ring in further embodiments.
Detailed Description
For a more clear understanding of the technical features, objects and effects of the present invention, embodiments of the present invention will now be described in detail with reference to the accompanying drawings.
Fig. 1-6 illustrate a through-flow clearance measurement system for a generator end assembly in some embodiments of the invention for measuring through-flow clearance data of a fan cooling structure between stationary blade mounts 31 and moving blades 34 on a generator end assembly 100. The through-flow clearance measuring system for the generator end assembly in the embodiment of the invention comprises a generator end assembly 100 and a plurality of through-flow clearance measuring devices 200, wherein the plurality of through-flow clearance measuring devices 200 are respectively arranged on the measuring holes 32 of the generator end assembly 100 and measure through-flow clearance data.
The generator end assembly 100 includes a stationary blade seat 31 and a rotor 33 disposed inside the stationary blade seat 31, the stationary blade seat 31 is provided with a plurality of measuring holes 32, and the rotor 33 is circumferentially distributed with a plurality of moving blades 34. A plurality of through-flow gap measuring devices 200 are arranged on the plurality of measuring holes 32 in a one-to-one correspondence. Alternatively, in some embodiments, the number of the through-flow clearance measuring devices 200 and the measuring holes 32 is at least 3, and at least 3 measuring holes 32 are uniformly arranged on the static blade mount 31 at intervals. Preferably, the number of through-flow gap measuring devices 200 and measuring bores 32 is 12 each. It is understood that the distance between two measuring holes 32 is the same, so that when the corresponding flow gap measuring device 200 of one measuring hole 32 is measured by abutting against the end face of one moving blade 34, the flow gap measuring device 200 of each of the other measuring holes 32 corresponds to the corresponding moving blade 34, thereby facilitating the measurement.
As further shown in FIG. 1, the flow gap measurement device 200 includes a body portion 210, a telescoping assembly 220, a power assembly 230, a data acquisition assembly 240, a display assembly 250, and a transmission assembly 260.
As shown in fig. 1 and 6, the body portion 210 includes a housing 12 and a mounting screw 16. The casing 12 has a tubular structure with one end closed and the other end open. The mounting screws 16 are used to fixedly mount the housing 12 to the corresponding measuring holes 32. The mounting screw 16 is disposed at the open end of the casing 12 and constitutes a body portion 210 of the through-flow gap measuring device 200 with the casing 12, and a cavity is formed inside the body portion 210. The mounting screw 16 is provided with a central guide hole. In some preferred embodiments, the body portion 210 of the housing 12 and mounting screw 16 is about 30cm long and has a cross-sectional radius of about 2.5 cm. This has the advantage of facilitating measurements in narrow locations.
Referring to fig. 1, 6 and 7, the telescopic assembly 220 is disposed in the cavity, and the telescopic assembly 220 includes a telescopic rod 17, a static grid ruler 15 and a movable grid ruler 14. The telescopic assembly 220 is used for measuring the displacement change of the telescopic rod 17 and obtaining the through-flow clearance data of the current measuring hole 32 when the telescopic rod 17 extends to contact the end part of the moving blade 34.
As shown in fig. 1, 5, 6, and 7, the telescopic rod 17 is inserted into the central guide hole of the mounting screw 16, and the telescopic rod 17 can selectively move back and forth along the axial direction of the casing 12. One end of the telescopic rod 17 is a measuring end and is positioned outside the cavity for contacting the moving blades 34 through telescopic control. It will be appreciated that the measuring tip may be of a T-shaped configuration for greater stability upon contact with the rotor blades 34. The other end of the telescopic rod 17 is a connecting end and is positioned in the cavity for connecting other internal components.
The static grid ruler 15 is fixedly arranged on the housing 12, the movable grid ruler 14 is arranged in parallel with the static grid ruler 15, the movable grid ruler 14 is connected with the telescopic rod 17 and moves along with the movement of the telescopic rod 17, so that relative displacement is generated between the movable grid ruler 14 and the static grid ruler 15, and the maximum relative displacement between the movable grid ruler 14 and the static grid ruler 15 when the telescopic rod 17 extends to contact with the end part of the movable blade 34 is through-flow clearance data. Preferably, the static grid ruler 15 is parallel to the movable grid ruler 14 and ensures a fixed distance. The telescopic assembly 220 drives the movable and static grid rulers 15 to move synchronously, and the matching measurement of the capacitive grid rulers improves the precision of distance measurement. In addition, in the past, measurement needs to be carried out repeatedly to ensure the accuracy of data, and in the process of gap adjustment, gaps of all measuring points change due to any adjustment, so that repeated measurement and verification need to be carried out again, and time and labor are wasted. At present, the gap value can be directly obtained only by installing a measuring device, and the efficiency is extremely high.
As shown in fig. 1, 6, 7, and 8, the power assembly 230 is connected to the extension rod 17 and is operable to provide power for extension and retraction of the extension rod 17. The power assembly 230 comprises a tension spring 13, a knob 21, a pull wire 11, a guide ring 22 and a threading hole 23. The extension spring 13 is located inside the cavity, and a first end of the extension spring 13 is fixedly arranged on the mounting threaded part 16, and a second end of the extension spring 13 is connected with the telescopic rod 17. The knob 21 is annular and is sleeved on the periphery of the shell 12; the first end of the pull wire 11 is connected with the second end of the tension spring 13, and the second end of the pull wire 11 is connected with the knob 21; in a clockwise or counterclockwise rotation of the knob 21, the wire 11 is pulled out or retracted, thereby extending or retracting the extension rod 17. The guide ring 22 is fixedly arranged in the shell 12, and the threading hole 23 is formed in the shell 12; the second end of the pull wire 11 is connected to the knob 21 through the guide ring 22 and the threading hole 23 in sequence. Specifically, one end of the pull wire 11 is fixed at one end of the tension spring 13 fixed with the part of the telescopic rod 17 in the cavity, and penetrates through the guide ring 22, the guide ring 22 is fixed in the shell 12, and one end of the pull wire 11 penetrating through the threading hole 23 of the shell 12 is fixed on the knob. Alternatively, the guide ring 22 may be secured within the housing shell 12 in a variety of ways. In the embodiment shown in fig. 8, a cross bar 18 is also provided which is fixed to the housing 12, and a guide ring 22 is provided on the cross bar 18 such that the guide ring 22 is fixed within the housing 12 by the cross bar 18.
As shown in fig. 1-8, in some embodiments, the force source of the knob 21 may be a manual mode or an automatic mode controlled by an external device, which is not limited herein, as long as the rotation function can be realized. Under the condition that the knob 21 is automatically controlled to rotate by an external device, the through-flow gap measuring device 200 in some embodiments realizes the relative displacement of the movable grid ruler 14 and the static grid ruler 15 through the action of the internal stay wire 11, the knob 21 and the guide ring 22, so that the measured value is synchronously changed, and the telescopic contact can be rotated to automatically measure after the measuring device is arranged in the measuring hole 32.
It can be seen that, the power assembly 230 is matched with the telescopic assembly 220, the rotating and lifting mode of the power assembly 230 controls the telescopic rod 17, after the telescopic rod 17 extends out to contact with the moving blade 34, the end part of the telescopic rod 17 is slowly released due to rotation, and is lightly pressed to the moving blade 34 with controllable and uniform downward pressure all the time, so that the problems that the tail part of the rigid mechanical ruler is long, the moving blade 34 is possibly damaged, and the measurement is possibly inaccurate in the prior art are solved. This has the advantage that the end of the telescopic rod 17 is lightly pressed onto the moving blades 34 with a controlled and uniform downward pressure, so that the measurement is more accurate and no damage is caused to the motor parts.
It will be appreciated that the specific structure of the power assembly 230, the manner of providing power, may also be other forms, such as providing power by electric power, hydraulic power, etc., and is not limited specifically herein, so long as the relevant function is achieved.
The use of the flow gap measurement device 200 in some embodiments of the present invention is described below in conjunction with FIGS. 1-8. When the knob 21 is rotated, the pull wire 11 is guided and guided through the guide ring 22 and the wire threading hole 23, is pulled by the knob 21 to be wound on the outer wall of the shell 12 and resists the pulling force of the tension spring 13, and then the telescopic rod 17 is pulled to be contracted into the cavity; during measurement, the knob 21 is rotated reversely, the pull wire 11 is released, the telescopic rod 17 extends out under the action of the tension spring 13, meanwhile, the movable grid ruler 14 and the static grid ruler 15 are displaced relatively, through-flow gap data changes until the end part of the telescopic rod 17 abuts against a measured object, the knob 21 continues to be rotated reversely, and the through-flow gap data is stable and unchanged.
In the prior art, when measuring through-flow clearance data, a measurer cannot observe the measuring hole 32, can only stretch a hand into a hand hole on a wind shield of a machine base by feeling to perform groping measurement, is afraid of that a rigid mechanical measuring device hurts a moving blade 34, and can only slightly push a mechanical depth gauge measuring rod to perform measurement. Most generators all use mechanical ruler to measure about the clearance is measured, and mechanical ruler afterbody all has with flexible first rigid connection or flexible or the mechanism of translation, uses in this kind of narrow and small position, brings very big inconvenience for data measurement to there is the risk that causes the damage to motor parts hard too violently. The advantage of some embodiments of the invention is that the relative displacement of the movable grid ruler 14 and the static grid ruler 15 is realized through the action of the internal stay wire 11, the knob 21 and the guide ring 22, so that the measured value is changed synchronously, and the problems of large tail space, possible damage to the movable blade 34 and inaccurate measurement of the rigid mechanical ruler in the prior art in a narrow space are solved.
As further shown in FIG. 1, the data collection assembly 240 is configured to collect flow gap data measured by all of the flow gap measurement devices 200. The display component 250 is connected to the data acquisition component 240 for displaying all the through-flow gap data.
In some embodiments, the current gap measurement system for the generator terminal assembly further includes a background receiving device 300, and the current gap measurement device 200 further includes a transmission component 260, where the transmission component 260 is connected with the data acquisition component 240, and receives and transmits the current gap data to the background receiving device 300.
Alternatively, in some embodiments, the data collection component 240, the display component 250, the transmission component 260, and the background receiving device 300 may or may not be provided. Under the condition that the data acquisition assembly 240, the display assembly 250, the transmission assembly 260 and the background receiving device 300 are not arranged, the through-flow gap measurement system for the generator end assembly obtains through-flow gap data only through the displacement measurement assembly, and the functions of data acquisition, display, transmission, processing and the like are realized through other external devices.
The through-flow clearance measuring system for the generator terminal assembly in the embodiment of the invention can greatly improve the working efficiency, and the prior 12 positions can be measured for one circle in 20 minutes, so that the current automatic measurement can be realized; the through-flow clearance adjustment work which previously required 36 hours to be completed now can be completed in 24 hours, and the precision is higher and more accurate. Greatly improving the technical level of the whole maintenance work.
In other embodiments of the present invention, a flow gap measurement apparatus is further provided, which is the same as the foregoing embodiments and will not be described herein again.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that several modifications and adaptations to those skilled in the art without departing from the principles of the present invention should also be considered within the scope of the present invention.
Claims (7)
1. A through-flow clearance measuring system for a generator end assembly is characterized by comprising the generator end assembly (100) and a plurality of through-flow clearance measuring devices (200), wherein the generator end assembly (100) comprises a static blade seat (31) and a rotor (33) arranged inside the static blade seat (31), a plurality of measuring holes (32) are formed in the static blade seat (31), and a plurality of moving blades (34) are circumferentially distributed on the rotor (33); the through-flow clearance measuring devices (200) are arranged on the measuring holes (32) in a one-to-one correspondence manner; the through-flow gap measuring device (200) comprises
A shell (12) which is a cylindrical structure with one end closed and the other end opened;
the mounting screw (16) is used for fixedly mounting the shell cover (12) on the corresponding measuring hole (32), the mounting screw (16) is arranged at the opening end of the shell cover (12) and forms a body part (210) of the through-flow clearance measuring device (200) together with the shell cover (12), a cavity is formed in the body part (210), and the mounting screw (16) is provided with a central guide hole;
the telescopic component (220) is arranged in the cavity and used for measuring the displacement change of a telescopic rod (17) which can selectively move back and forth along the axial direction of the shell cover (12) and obtaining the current through-flow clearance data of the measuring hole (32) when the telescopic rod (17) extends to contact with the end part of the moving blade (34), and the telescopic rod (17) is arranged on the central guide hole of the mounting screw (16) in a penetrating way;
a power assembly (230) connected with the telescopic rod (17) and operable to provide power for extending or retracting the telescopic rod (17);
the telescopic assembly (220) further comprises a static grid ruler (15) and a movable grid ruler (14), the static grid ruler (15) is fixedly arranged on the housing (12), the movable grid ruler (14) is arranged in parallel with the static grid ruler (15), the movable grid ruler (14) is connected with the telescopic rod (17) and moves along with the movement of the telescopic rod (17), so that a relative displacement is generated between the movable grid ruler (14) and the static grid ruler (15), and when the telescopic rod (17) extends to contact with the end part of the movable blade (34), the maximum relative displacement between the movable grid ruler (14) and the static grid ruler (15) is the through-flow gap data; the static grid ruler (15) is parallel to the movable grid ruler (14) and a fixed distance is guaranteed;
the power assembly (230) comprises a tension spring (13), a knob (21) and a pull wire (11); the tension spring (13) is positioned in the cavity, the first end of the tension spring (13) is fixedly arranged on the mounting threaded part (16), and the second end of the tension spring (13) is connected with the telescopic rod (17); the knob (21) is annular and is sleeved on the periphery of the shell cover (12); one end of the pull wire (11) is fixed at one end of the tension spring (13) which is fixed with the part of the telescopic rod (17) in the cavity; the first end of the pull wire (11) is connected with the second end of the tension spring (13), and the second end of the pull wire (11) is connected with the knob (21); in the state that the knob (21) is operably rotated clockwise or anticlockwise, the pull wire (11) is pulled out or pulled back, so that the telescopic rod (17) is driven to extend or retract.
2. The through-flow clearance measurement system for a generator end assembly of claim 1, wherein the power assembly (230) further comprises a guide ring (22) and a threading bore (23), the guide ring (22) being fixedly disposed within the casing (12), the threading bore (23) opening onto the casing (12); the second end of the pull wire (11) sequentially penetrates through the guide ring (22) and the threading hole (23) to be connected to the knob (21).
3. The through-flow clearance measurement system for a generator end assembly of any one of claims 1-2, wherein the number of the through-flow clearance measurement devices (200) and the measurement holes (32) is at least 3, and at least 3 of the measurement holes (32) are evenly spaced on the static blade seat (31).
4. The through-flow clearance measurement system for a generator end assembly of claim 3, wherein the number of through-flow clearance measurement devices (200) and measurement holes (32) is 12 each.
5. The through-flow clearance measurement system for a generator end assembly of any of claims 1-2, wherein the through-flow clearance measurement device (200) further comprises a data collection assembly (240) for collecting the through-flow clearance data measured by all of the through-flow clearance measurement devices (200).
6. The through-flow clearance measurement system for a generator end assembly of claim 5, wherein the through-flow clearance measurement device (200) further comprises a display assembly (250) coupled to the data acquisition assembly (240) for displaying all of the through-flow clearance data.
7. The current gap measurement system for a generator end assembly of claim 5, further comprising a background receiving device (300), wherein the current gap measurement device (200) further comprises a transmission assembly (260), and wherein the transmission assembly (260) is connected with the data acquisition assembly (240) and receives and transmits the current gap data to the background receiving device (300).
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| CN111928769A (en) * | 2020-08-11 | 2020-11-13 | 中广核核电运营有限公司 | Distance measuring device |
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| KR19980052452A (en) * | 1996-12-24 | 1998-09-25 | 김종진 | Edge roll gap automatic measuring device using telescopic moving device |
| CN102829699A (en) * | 2012-08-03 | 2012-12-19 | 上海电气电站设备有限公司 | Device and method for measuring gap between steam turbine movable blades and cylinder inner wall |
| CN104314624A (en) * | 2014-08-20 | 2015-01-28 | 东方电气集团东方汽轮机有限公司 | Device and method for monitoring center change of air cylinder in process of covering cylinder of steam turbine |
| CN204484687U (en) * | 2015-03-10 | 2015-07-22 | 河北联合大学 | A kind of stiff spring chip finger rehabilitation device |
| US20190003814A1 (en) * | 2016-11-30 | 2019-01-03 | Teruko ISHIKAWA | Displacement measuring device |
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| CN111928769A (en) * | 2020-08-11 | 2020-11-13 | 中广核核电运营有限公司 | Distance measuring device |
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| CN112097604A (en) | 2020-12-18 |
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