Calibration device for overspeed fly ball of small steam turbine

Abstract

The utility model relates to a car overspeed fly weight calibration device, which comprises a device main body and a distance measuring device, the device main body comprises a mounting part and a measuring part, the mounting part is provided with a mounting structure, and the measuring part comprises two measuring reference surfaces which are symmetrically arranged about the mounting structure; the distance between the two measuring reference surfaces is gradually increased from one end close to the mounting part, the measuring reference surfaces are used for being in contact fit with the rotor axial surface, and the distance measuring device is mounted on the mounting structure and is used for measuring the radial positions of the rotor axial surface and the arc surface of the striking end of the fly ball in the radial direction of the rotor axial surface. According to the calibration device, the eccentric distance can be quantified through quantitative analysis of the flyweight, the requirement for high installation precision of the flyweight is met according to the requirement for regular maintenance of equipment, blindness of regular overspeed tests can be effectively avoided, and preventability and foresight can be achieved. The overspeed test progress and the safety quality of the small steam turbine are well promoted, and the overhaul efficiency and the overspeed test effect of the small steam turbine can be improved.

Description

Technical Field

[0001] This utility model relates to the field of nuclear power mechanical equipment maintenance technology, and in particular to a small steam turbine overspeed fly hammer calibration device. Background Technology

[0002] Nuclear power plant turbines are equipped with overspeed protection devices on their rotors. If the rotor speed increases uncontrollably, to prevent overspeeding, the turbine reaches a certain high speed, and the overspeed hammer automatically flies out, causing steam blockage and shutdown. The overspeed hammer's setpoint directly affects the turbine's overspeed protection function. The overspeed hammer's condition and actual speed setpoint verification are conducted annually or every 1.5 years. However, traditional test-based verification methods have blind spots in estimating the actual overspeed hammer setpoint, making quantification impossible and posing a risk of blindly failing overspeed setpoint tests, thus affecting maintenance quality and turbine equipment safety. Utility Model Content

[0003] The purpose of this invention is to provide a calibration device for overspeed fly weights in small steam turbines, so as to realize quantitative analysis of fly weights and quantification of eccentricity, effectively avoid the blindness of periodic overspeed tests, and ensure maintenance quality and safety of small steam turbine equipment.

[0004] To achieve the above objectives, this utility model provides the following technical solution:

[0005] A small steam turbine overspeed fly weight calibration device includes:

[0006] The device body includes a mounting part and a measuring part. The mounting part is provided with a mounting structure. The measuring part includes two measuring reference surfaces symmetrically arranged about the mounting structure. The distance between the two measuring reference surfaces gradually increases from one end closer to the mounting part. The measuring reference surfaces are used to contact and cooperate with the rotor shaft surface.

[0007] A ranging device is installed on the mounting structure and is used to measure the radial position of the rotor shaft surface and the arc surface of the hammer impact end along the radial direction of the rotor shaft surface.

[0008] In one embodiment of this application, the ranging device is one of a dial indicator, a micrometer, and a laser rangefinder.

[0009] In one embodiment of this application, the ranging device is a dial indicator. The mounting structure includes a first clamping part, a second clamping part, and a fastening mechanism. The gap between the first clamping part and the second clamping part is adjustable, and the first clamping part and the second clamping part form a mounting hole for mounting the ranging device. The two measuring reference surfaces are symmetrical about the axis of the mounting hole. The fastening mechanism is used to connect the first clamping part and the second clamping part to reduce the cross-sectional area of ​​the mounting hole and clamp the dial indicator. The detection end of the dial indicator extends between the two measuring reference surfaces along the symmetrical surface of the two measuring reference surfaces.

[0010] In one embodiment of this application, the first clamping part is fixedly disposed on the mounting part, the second clamping part is elastically deformable disposed on the mounting part, and the fastening mechanism is disposed between the first clamping part and the second clamping part for applying an external force to the second clamping part to bring it closer to the first clamping part.

[0011] In one embodiment of this application, the fastening mechanism includes:

[0012] A through hole is provided in one of the first clamping portion and the second clamping portion;

[0013] A threaded hole is provided in another of the first clamping portion and the second clamping portion;

[0014] A fastening bolt, which passes through the through hole and engages with the threaded hole.

[0015] In one embodiment of this application, the measuring part includes a connecting plate and a measuring plate. One end of the connecting plate is connected to the mounting part, and the other end is connected to the measuring plate. The measuring plate is inclined from the end connected to the connecting plate toward the measuring part at the other end away from the mounting part. The measuring reference surface is disposed on the opposite side of the measuring plates of the two measuring parts.

[0016] In one embodiment of this application, the two measuring units are disposed on the mounting portion via a symmetrical adjustment mechanism, the symmetrical adjustment mechanism comprising:

[0017] An intermediate gear is rotatably disposed on the mounting portion;

[0018] Two racks are symmetrically arranged about the center of the intermediate gear. The two racks are reciprocally slidably disposed on the mounting part. The two racks respectively mesh with the intermediate gear. The connecting plate is connected to the mounting part through the racks.

[0019] In one embodiment of this application, at least one of the measuring plates is provided with a hollowed-out groove, which extends from the end of the measuring plate connected to the connecting plate to the end of the measuring plate away from the connecting plate.

[0020] In one embodiment of this application, the hollowed-out groove extends through the measuring plate along the thickness direction.

[0021] In one embodiment of this application, a protective sleeve is provided on the measuring end of the dial indicator.

[0022] As can be seen from the above technical solution, this utility model discloses a small steam turbine overspeed fly hammer calibration device. The small steam turbine overspeed fly hammer calibration device includes a device body and a ranging device. The device body includes an installation part and a measuring part. The installation part is provided with an installation structure. The measuring part includes two measuring reference surfaces symmetrically arranged about the installation structure. The distance between the two measuring reference surfaces gradually increases from the end closer to the installation part. The measuring reference surfaces are used to contact and cooperate with the rotor shaft surface. The rotor shaft surface refers to the curved surface on the rotor with the rotor shaft as the center of rotation, that is, the circumferential surface of the rotor. The ranging device is installed on the installation structure and is used to measure the radial position of the rotor shaft surface and the arc surface of the fly hammer impact end along the radial direction of the rotor shaft surface.

[0023] In application, the ranging device is installed on the mounting structure, and then the two measuring reference surfaces are pressed against the rotor shaft surface. The ranging device is then used to measure the highest point of the arc surface at the impact end of the fly hammer and the rotor shaft surface, respectively, obtaining the radial position information of both the arc surface and the rotor shaft surface. The difference between these two radial position information is the fly hammer calibration data. Therefore, the aforementioned small steam turbine overspeed fly hammer calibration device can quantify the eccentricity through fly hammer quantitative analysis, achieving high fly hammer installation accuracy according to the equipment's periodic maintenance requirements. It also effectively avoids the blindness of periodic overspeed testing, preventing the inefficient adjustment after actual value deviations, thus achieving preventative and proactive results. This has a beneficial effect on the progress, safety, and quality of small steam turbine overspeed testing, improving the efficiency of small steam turbine maintenance and the effectiveness of overspeed testing. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 A schematic diagram of the main body of the small steam turbine overspeed fly hammer calibration device provided in this embodiment of the utility model;

[0026] Figure 2 A schematic diagram of the structure of the small steam turbine overspeed fly hammer calibration device provided in this embodiment of the present invention when measuring the radial position of the arc surface of the fly hammer impact end;

[0027] Figure 3 A schematic diagram of the structure of the small steam turbine overspeed fly hammer calibration device provided in this embodiment of the present invention when measuring the radial position of the rotor shaft surface;

[0028] Figure 4 A cross-sectional view of a small steam engine equipped with an overspeed fly hammer;

[0029] Figure 5 This is a cross-sectional view of the high-speed flying hammer.

[0030] In the picture:

[0031] 100 is the mounting part; 101 is the first clamping part; 102 is the second clamping part; 103 is the mounting hole; 104 is the through hole; 200 is the measuring part; 201 is the measuring reference surface; 202 is the connecting plate; 203 is the measuring plate; 204 is the hollow groove; 300 is the dial indicator; 301 is the measuring end; 400 is the rotor; 401 is the rotor shaft surface; 500 is the overspeed fly hammer; 501 is the outer fly hammer; 502 is the inner fly hammer; 503 is the end cover; 504 is the spring; 505 is the fly hammer striking end. Detailed Implementation

[0032] The core of this utility model is to provide a small steam turbine overspeed fly weight calibration device. The structural design of this small steam turbine overspeed fly weight calibration device enables it to achieve quantitative analysis of the fly weight and quantification of the eccentricity, effectively avoiding the blindness of periodic overspeed tests, and ensuring maintenance quality and the safety of small steam turbine equipment.

[0033] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0034] Please see Figures 1 to 3 , Figure 1 This is a schematic diagram of the main body of the small steam turbine overspeed flyweight calibration device provided in this embodiment of the utility model. Figure 2 This is a schematic diagram of the structure of the small steam turbine overspeed fly hammer calibration device provided in this embodiment of the invention, used to measure the radial position of the arc surface of the fly hammer impact end. Figure 3 A schematic diagram of the structure of the small steam turbine overspeed fly hammer calibration device provided in this embodiment of the present invention when measuring the radial position of the rotor shaft surface.

[0035] This utility model discloses a small steam turbine overspeed fly hammer calibration device, which includes a device body and a ranging device.

[0036] The main body of the device is made of rigid materials, including but not limited to metal and plastic. The main body of the device includes a mounting part 100 and a measuring part 200. The mounting part 100 is provided with a mounting structure for mounting the ranging device. The measuring part 200 includes two measuring reference surfaces 201 symmetrically arranged about the mounting structure. The measuring reference surfaces 201 are precision machined surfaces. The distance between the two measuring reference surfaces 201 gradually increases from the end closer to the mounting part 100. The measuring reference surfaces 201 are used to contact and cooperate with the rotor shaft surface 401. The rotor shaft surface 401 refers to the curved surface on the rotor 400 with the axis of the rotor 400 as the center of rotation, that is, the circumferential surface of the rotor 400.

[0037] The ranging device is installed on the mounting structure. The ranging device is used to measure the radial position of the rotor shaft surface 401 and the arc surface of the hammer impact end 505 along the radial direction of the rotor shaft surface 401. The ranging device includes, but is not limited to, dial indicator 300, micrometer and laser rangefinder.

[0038] In application, the ranging device is installed on the mounting structure, and then the two measuring reference surfaces 201 are pressed against the rotor shaft surface 401. The ranging device is then used to measure the highest point of the arc surface of the hammer impact end 505 and the rotor shaft surface 401 to obtain the radial position information of the arc surface of the hammer impact end 505 and the radial position information of the rotor shaft surface 401. The difference between the radial position information of the arc surface of the hammer impact end 505 and the radial position information of the rotor shaft surface 401 is the hammer calibration data.

[0039] Compared with existing technologies, the small steam turbine overspeed flyweight calibration device provided in this embodiment can quantify the eccentricity through flyweight quantitative analysis. It meets the high accuracy requirements for flyweight installation according to the equipment's regular maintenance requirements and effectively avoids the blindness of regular overspeed testing, where adjustments after actual value deviations are not worthwhile. It achieves preventative and forward-looking capabilities. This device positively promotes the progress, safety, and quality of small steam turbine overspeed testing, improving the efficiency of small steam turbine maintenance and the effectiveness of overspeed testing.

[0040] In one specific embodiment of this application, such as Figure 2 and Figure 3As shown, the ranging device is a dial indicator 300. The mounting structure includes a first clamping part 101, a second clamping part 102, and a fastening mechanism. The gap between the first clamping part 101 and the second clamping part 102 is adjustable, and the first clamping part 101 and the second clamping part 102 form a mounting hole 103 for mounting the ranging device. The inner surface of the mounting hole 103 is a precision-machined surface. The two measuring reference surfaces 201 are symmetrical about the axis of the mounting hole 103. The fastening mechanism is used to connect the first clamping part 101 and the second clamping part 102 to reduce the cross-sectional area of ​​the mounting hole 103 and clamp the dial indicator 300. The detection end of the dial indicator 300 extends between the two measuring reference surfaces 201 along the symmetrical surface of the two measuring reference surfaces 201.

[0041] The following is combined Figure 4 and Figure 5 The working principle of the small steam turbine overspeed fly hammer 500 calibration device in the embodiments of this application is introduced.

[0042] like Figure 4 and Figure 5 As shown, the overspeed fly hammer 500 includes an outer fly hammer 501, an end cap 503, an inner fly hammer 502, and a spring 504. One end of the outer fly hammer 501 is a closed fly hammer striking end 505, and the other end is provided with an inlet for the inner fly hammer 502 and the spring 504 to enter. The end cap 503 is fixedly connected to the outer fly hammer 501 at the inlet of the outer fly hammer 501 to form a cavity for accommodating the inner fly hammer 502 and the spring 504. The inner fly hammer 502 is reciprocally disposed inside the outer fly hammer 501 along its own axis. The axis of the inner fly hammer 502 is perpendicular to the axis of the rotor 400, and the end of the inner fly hammer 502 away from the fly hammer striking end 505 is limited by the end cap 503. A spring 504 is provided between the inner fly hammer 502 and the outer fly hammer 501 to reset the inner fly hammer 502.

[0043] First, it is necessary to analyze the center of gravity position of the inner flying hammer 502, such as... Figure 4 and Figure 5 As shown, the distance from the end face of the inner flying hammer 502 near the end cover 503 to the striking end 505 of the flying hammer is L1, and the distance from the end face of the inner flying hammer 502 near the end cover 503 to the center of gravity of the inner flying hammer 502 is L2. The diameter of the rotor 400 at the installation position of the overspeed flying hammer 500 is D. Assuming that after the initial installation of the overspeed flying hammer 500, the highest point of the arc of the striking end 505 of the flying hammer coincides with the axial surface 401 of the rotor shaft, then according to the analysis, the eccentricity of the center of gravity of the inner flying hammer 502 relative to the axis of the rotor 400 is e = D / 2 - (L1 - L2).

[0044] Then, force and mass analysis of the flyweight are performed, and the relationship between the flyweight's rotational speed and eccentricity is established as N = F(e). The overspeed flyweight 500 is subjected to centrifugal force F during the operation of the small steam turbine. L 504 spring force F TForce F between end cap 503 D The action of three forces. When the rotor speed of the small steam turbine is 400 rpm and 0, the centrifugal force is also 0, and the internal flyweight 502 is subjected to the force F of spring 504. T and the force F of end cap 503 D Under the action of [something], it remains stationary. When the small turbine rotor 400 starts to rotate, as the speed increases, the centrifugal force F of the inner flyweight 502 [something]. L The force increases, but has not yet exceeded the spring force F of 504. T In this situation, the internal flying hammer 502 will not move.

[0045] As the rotor speed continues to increase at 400 rpm, the centrifugal force continues to increase. Assuming the rotor speed continues to rise to N0, F... D When the force is reduced to 0, the force relationship of the inner flying hammer 502 is F. L =F T .

[0046] The above-mentioned spring has a force F of 504. T It consists of two parts: one is the force F generated by the compression of spring 504. TS Secondly, the force F exerted by the movable end of spring 504 on the inner flying hammer 502 is generated by spring 504 itself rotating around the axis of rotor 400. TC F TC The solution can be obtained using the following formula:

[0047] F TC =K(αX) a -βX b )

[0048] In the above formula, K is the stiffness of spring 504, and X a X is the distance from the movable end face of spring 504 to the rotor axis at a distance of 400. b The distance between the fixed end face of spring 504 and the rotor axis is 400. Figure 5 As shown, α and β are respectively:

[0049]

[0050] In the formula m s Let g be the mass of the spring (504), g be the acceleration due to gravity, and ω be the angular velocity of the rotor (40°).

[0051] Based on the measured parameters such as the mass and center of gravity of the inner flying hammer 502, as well as the force analysis of the inner flying hammer 502, the rotational speed of the inner flying hammer 502 under the initial installation conditions can be calculated.

[0052] Under initial installation conditions (the highest point of the arc surface of the impact end 505 of the impact hammer coincides with the rotor shaft surface 401), the eccentricity of the fly hammer is e. When the fly hammer needs to be adjusted, the eccentricity of the overspeed fly hammer 500 can be indirectly calculated by measuring the radial displacement of the impact end 505 of the fly hammer relative to the rotor shaft surface 401. Using the rotor shaft surface 401 as the measurement reference, the reference dimension A1 of the rotor shaft surface 401 is measured, and the positioning dimension A2 of the impact end 505 of the fly hammer is measured. Then, the radial position difference of the overspeed fly hammer 500 relative to the rotor shaft surface 401 is A = A2 - A1, and the eccentricity of the fly hammer at this time is e' = e + A.

[0053] To make it easier to understand, we will provide further explanation below with specific numerical values.

[0054] In one specific embodiment, the distance L1 = 74.7 mm between the end face of the inner flying hammer 502 near the end cover 503 and the striking end 505 of the flying hammer, and the distance L2 = 29.24 mm between the end face of the inner flying hammer 502 near the end cover 503 and the center of gravity of the inner flying hammer 502, and the diameter D = 95.25 mm of the rotor 400 at the installation position of the overspeed flying hammer 500, assuming that the highest point of the arc of the striking end 505 of the flying hammer coincides with the rotor shaft surface 401 after the initial installation of the overspeed flying hammer 500, then according to the analysis, the eccentricity of the center of gravity of the inner flying hammer 502 relative to the axis of the rotor 400 is e = D / 2 - (L1 - L2) = 95.25 / 2 - (74.7 - 29.24) = 2.165 mm.

[0055] In the subsequent calibration process, the eccentricity of the flying hammer is e' = 2.165 + A.

[0056] Taking initial parameters as an example, the pre-compression of spring 504 is 7.55mm, the mass of inner flyweight 502 is 55g, the stiffness of spring 504 is 5.6N / mm, the mass of spring 504 is 24.6712g, and X... a It is 20.28mm, X b The value is 22.17mm. The initial operating speed of the flyweight is calculated to be 9838rpm. Based on the required flyweight setpoint, a reverse calculation is performed to obtain the required adjustment amount of the flyweight relative to the axial plane 401, which is initially estimated at 100rpm / 0.01mm. This achieves a pre-evaluation of the flyweight setpoint.

[0057] As a preferred option, such as Figure 1 As shown, the first clamping part 101 is fixedly disposed on the mounting part 100, the second clamping part 102 is elastically deformable disposed on the mounting part 100, and the fastening mechanism is disposed between the first clamping part 101 and the second clamping part 102 for applying an external force to the second clamping part 102 to bring it closer to the first clamping part 101, that is, the fastening mechanism applies a force to the second clamping part 102 to bring it closer to the first clamping part 101, so as to achieve clamping of the dial indicator 300.

[0058] Specifically, such as Figure 1 As shown, the fastening mechanism includes a through hole 104, a threaded hole, and a fastening bolt. The through hole 104 is provided in one of the first clamping part 101 and the second clamping part 102, and the threaded hole is provided in the other of the first clamping part 101 and the second clamping part 102. The fastening bolt passes through the through hole 104 and engages with the threaded hole. As the fastening bolt is tightened in the threaded hole, the first clamping part 101 and the second clamping part 102 can be brought closer to each other to clamp the dial indicator 300.

[0059] like Figures 1 to 3 As shown, in one specific embodiment of this application, the measuring unit 200 includes a connecting plate 202 and a measuring plate 203. One end of the connecting plate 202 is connected to the mounting unit 100, and the other end is connected to the measuring plate 203. The measuring plate 203 is inclined from the end connected to the connecting plate 202 toward the measuring unit 200 at the other end away from the mounting unit 100. The measuring reference surface 201 is disposed on the side of the measuring plates 203 of the two measuring units 200 facing each other.

[0060] To improve the adaptability of the small steam turbine overspeed fly hammer calibration device in this application embodiment, and to calibrate rotors 400 and overspeed fly hammers 500 of different specifications, in one embodiment of this application, two measuring units 200 are arranged on the mounting part 100 through a symmetrical adjustment mechanism. The symmetrical adjustment mechanism includes an intermediate gear and a rack. The intermediate gear is rotatably arranged on the mounting part 100, and the two racks are symmetrically arranged about the center of the intermediate gear. The two racks are reciprocally slidably arranged on the mounting part 100, and the two racks mesh with the intermediate gear respectively. The connecting plate 202 is connected to the mounting part 100 through the rack, so that the distance between the two reference measuring surfaces can be adjusted within a certain range as needed.

[0061] To reduce friction between the measuring plate 203 and the rotor shaft surface 401, and to reduce the weight of the small steam turbine overspeed fly hammer calibration device, such as Figure 1 As shown, in one embodiment of this application, at least one measuring plate 203 is provided with a hollow groove 204, which extends from the end of the measuring plate 203 connected to the connecting plate 202 to the end of the measuring plate 203 away from the connecting plate 202. Further, the hollow groove 204 penetrates the measuring plate 203 along its thickness direction.

[0062] The measuring end 301 of the dial indicator 300 needs to contact the rotor shaft surface 401 and the hammer impact end 505. In order to protect the measuring end 301, rotor shaft surface 401 and hammer impact end 505 of the dial indicator 300, in one embodiment of this application, the measuring end 301 of the dial indicator 300 is provided with a protective sleeve, which includes, but is not limited to, a nylon sleeve.

[0063] In the above specific embodiment, when using the small turbine overspeed fly hammer calibration device, it is first placed on the corresponding rotor shaft surface 401, ensuring that the measuring reference surface 201 is in close contact with the rotor shaft surface 401. The dial indicator 300 is inserted into the mounting hole 103, and a fastening bolt is screwed through the through hole 104 into the threaded hole. The measuring end 301 of the dial indicator 300 is perpendicularly and directly in contact with the rotor shaft surface 401, so that the measuring end 301 of the dial indicator 300 has a certain amount of compression. The fastening bolt is tightened to ensure the dial indicator 300 is stable, and the smooth movement of the measuring end 301 of the dial indicator 300 is tested. The small turbine overspeed fly hammer calibration device is manually slid across the rotor shaft surface 401, measuring a data point at the high point of the fly hammer impact end 505 of the dial indicator 300 and another data point on the rotor shaft surface 401. The difference is the calibration data.

[0064] It should be noted that the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0065] This article uses specific examples to illustrate the principles and implementation methods of this utility model. The descriptions of the above embodiments are only for the purpose of helping to understand the core ideas of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the principles of this utility model, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

Claims

1. A small steam turbine overspeed fly weight calibration device, characterized in that, include: The device body includes a mounting part (100) and a measuring part (200). The mounting part (100) is provided with a mounting structure. The measuring part (200) includes two measuring reference surfaces (201) symmetrically arranged about the mounting structure. The distance between the two measuring reference surfaces (201) gradually increases from one end closer to the mounting part (100). The measuring reference surfaces (201) are used to contact and cooperate with the rotor shaft surface (401). A ranging device is installed on the mounting structure and is used to measure the radial position of the rotor shaft surface (401) and the arc surface of the hammer impact end along the radial direction of the rotor shaft surface (401).

2. The small steam turbine overspeed fly weight calibration device according to claim 1, characterized in that, The ranging device is one of a dial indicator (300), a micrometer, or a laser rangefinder.

3. The small steam turbine overspeed fly weight calibration device according to claim 2, characterized in that, The ranging device is a dial indicator (300). The mounting structure includes a first clamping part (101), a second clamping part (102), and a fastening mechanism. The gap between the first clamping part (101) and the second clamping part (102) is adjustable, and the first clamping part (101) and the second clamping part (102) form a mounting hole (103) for mounting the ranging device. The two measuring reference surfaces (201) are symmetrical about the axis of the mounting hole (103). The fastening mechanism is used to connect the first clamping part (101) and the second clamping part (102) to reduce the cross-sectional area of ​​the mounting hole (103) and clamp the dial indicator (300). The detection end of the dial indicator (300) extends between the two measuring reference surfaces (201) along the symmetrical surface of the two measuring reference surfaces (201).

4. The small steam turbine overspeed fly weight calibration device according to claim 3, characterized in that, The first clamping part (101) is fixedly disposed on the mounting part (100), the second clamping part (102) is elastically deformable disposed on the mounting part (100), and the fastening mechanism is disposed between the first clamping part (101) and the second clamping part (102) for applying an external force to the second clamping part (102) to bring it closer to the first clamping part (101).

5. The small steam turbine overspeed fly weight calibration device according to claim 4, characterized in that, The fastening mechanism includes: A through hole (104) is provided in one of the first clamping part (101) and the second clamping part (102); A threaded hole is provided in another of the first clamping part (101) and the second clamping part (102); A fastening bolt, which passes through the through hole (104) and engages with the threaded hole.

6. The small steam turbine overspeed fly weight calibration device according to claim 3, characterized in that, The measuring unit (200) includes a connecting plate (202) and a measuring plate (203). One end of the connecting plate (202) is connected to the mounting unit (100), and the other end is connected to the measuring plate (203). The measuring plate (203) is inclined from the end connected to the connecting plate (202) toward the measuring unit (200) away from the mounting unit (100). The measuring reference surface (201) is disposed on the side of the measuring plates (203) of the two measuring units (200) facing each other.

7. The small steam turbine overspeed fly weight calibration device according to claim 6, characterized in that, The two measuring units (200) are disposed on the mounting unit (100) by a symmetrical adjustment mechanism, the symmetrical adjustment mechanism comprising: An intermediate gear is rotatably disposed on the mounting portion (100); Two racks are symmetrically arranged about the center of the intermediate gear. The two racks are reciprocally slidably arranged in the mounting part (100). The two racks mesh with the intermediate gear respectively. The connecting plate (202) is connected to the mounting part (100) through the racks.

8. The small steam turbine overspeed fly weight calibration device according to claim 6, characterized in that, At least one of the measuring plates (203) is provided with a cutout groove (204) that extends from the end of the measuring plate (203) connected to the connecting plate (202) to the end of the measuring plate (203) away from the connecting plate (202).

9. The small steam turbine overspeed fly weight calibration device according to claim 8, characterized in that, The hollowed-out groove (204) penetrates the measuring plate (203) along the thickness direction.

10. The small steam turbine overspeed fly weight calibration device according to claim 3, characterized in that, The measuring end (301) of the dial gauge (300) is fitted with a protective sleeve.

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