Synchronous high-precision tightening and height monitoring tool for thermocouple puller bolt

Abstract

The utility model discloses a thermocouple puller bolt synchronous high-precision tightening and height monitoring tool, which comprises a console, a measuring tool and a tightening tool, the tightening tool comprises a linkage driving part and a speed reducer, and the measuring tool comprises a precision measuring part and a display device. The precision test part sleeves a test workpiece to perform precision position test preparation work, the precision test part is connected with the console to feed back test information, the display device is connected with the console to display the test information of the precision test part, and the linkage driving part is installed below the speed reducer to be used for tightening a puller bolt on the test workpiece. The speed reducer is connected with the console and moves after receiving control information of the console, the top of the speed reducer inputs power through the power input shaft, accurate and synchronous screwing between bolts can be achieved, the high-precision torque control capacity is achieved, the height detection function is integrated, and therefore the installation efficiency and safety of thermocouple mechanical seal are improved. The irradiation dose of personnel is reduced, and the disassembly and assembly technological process is optimized.

Description

Technical Field

[0001] The utility model relates to the technical field of nuclear power equipment, in particular to a tool for synchronous high-precision tightening and height monitoring of thermocouple jacking bolts. Background Art

[0002] During the operation and maintenance of nuclear power plant reactors, the reactor pressure vessel top cover thermocouple mechanical seal, a key component of the reactor's primary circuit pressure boundary, is crucial for installation and removal. Especially during overhauls, when the reactor cover is opened and closed for operations, the efficiency of thermocouple mechanical seal installation and removal directly impacts the overall overhaul progress and personnel safety.

[0003] At present, other domestic manufacturers generally use six motors to drive the bolts separately during the installation of thermocouple mechanical seals. Although this design is relatively simple in structure, it exposes many safety risks and shortcomings in actual application:

[0004] 1. Synchronicity Issues: Because each bolt is tightened by an independent motor, synchronization between the bolts depends entirely on the precise control of the electronic control program. However, in actual operation, factors such as motor performance differences, transmission mechanism wear, and electronic control program response delays can cause angular deviations between the bolts during the tightening process, leading to overall jamming and seriously affecting installation quality and efficiency.

[0005] 2. Torque Precision Control: Motor torque output is typically achieved by adjusting the current, which can result in significant errors and makes high-precision torque control difficult. For critical components like thermocouple mechanical seals, torque control accuracy is directly related to seal tightness and long-term operational stability. Therefore, existing methods struggle to meet the demands of high-precision tightening. 3. Lack of Height Detection: Accurately controlling the bolt tightening height (i.e., the degree of tightening) is crucial during bolt tightening. However, current designs often lack effective height detection tools, making it difficult for operators to accurately determine whether the bolt has reached the intended tightening position, increasing uncertainty and risk during installation. 4. Equipment Size and Operational Difficulty: Due to the use of multiple motors and complex electronic control devices, existing tools are often bulky and difficult to operate in the cramped environment of a nuclear island. Furthermore, the need for an external power supply increases the complexity and safety risks of on-site operations. Therefore, a tool for simultaneous high-precision tightening and height monitoring of thermocouple tightening bolts is proposed to address these technical issues. Utility Model Content

[0006] The purpose of the present invention is to solve the above-mentioned technical problems and provide a tool for synchronous high-precision tightening and height monitoring of thermocouple tightening bolts. The present invention can realize precise synchronous tightening between bolts, has high-precision torque control capability, and integrates height detection function to improve the installation efficiency and safety of thermocouple mechanical seals, reduce the radiation dose to personnel, and optimize the disassembly and assembly process and procedures.

[0007] The technical solution adopted by the utility model to solve the above technical problems is: a thermocouple tightening bolt synchronous high-precision tightening and height monitoring tool, including a console, a measuring tool and a tightening tool, the tightening tool including a linkage drive component and a reducer, the measuring tool including a precision measuring component and a display device, the precision measuring component is sleeved on the test workpiece to prepare for the precision position test, the precision measuring component is connected to the console to feedback the test information, the display device is connected to the console to display the test information of the precision measuring component, the linkage drive component is installed under the reducer for tightening the tightening bolts on the test workpiece, the reducer is connected to the console to receive the control information of the console and then moves, the top of the reducer inputs power through the power input shaft, and the lower end of the reducer is connected to the drive component.

[0008] Preferably, the linkage drive component includes a middle drive component, a left tightening component and a right tightening component, the left tightening component and the right tightening component are both installed on the middle drive component, and the reducer is connected to the upper end of the middle drive component.

[0009] Preferably, locking holes are provided on the outer sides of the left tightening component and the right tightening component, and the locking holes close and fix the left tightening component and the right tightening component through locking pins. Opening and closing handles are provided on the tops of the left tightening component and the right tightening component.

[0010] Preferably, the middle driving component includes a left tightening gear and a right tightening gear, the bottom of the left tightening gear is connected to the first tightening shaft, the bottom of the right tightening gear is connected to the second tightening shaft, and the reducer is connected to the left tightening gear and the right tightening gear.

[0011] Preferably, the left tightening component is provided with a third tightening shaft and a fifth tightening shaft, the right tightening component is provided with a fourth tightening shaft and a sixth tightening shaft, the fifth tightening shaft is installed on the outside of the third tightening shaft, and the sixth tightening shaft is installed on the outside of the fourth tightening shaft.

[0012] Preferably, the bottoms of the first tightening shaft, the second tightening shaft, the third tightening shaft, the fourth tightening shaft, the fifth tightening shaft and the sixth tightening shaft are all provided with a torque limiter, a connecting ratchet and a bolt connecting head, the torque limiter is arranged at the lower end of the tightening shaft, the connecting ratchet is installed at the lower end of the torque limiter, and the bolt connecting head is installed at the lower end of the connecting ratchet.

[0013] Preferably, the first tightening shaft, the third tightening shaft and the fifth tightening shaft are connected and moved via a synchronous belt, and the second tightening shaft, the fourth tightening shaft and the sixth tightening shaft are connected and moved via a synchronous belt.

[0014] Preferably, the precision measuring component includes a measuring ring, a positioning ring and several displacement sensors. The measuring ring is installed above the positioning ring, and the displacement sensor is installed at the bottom of the positioning ring. Both the measuring ring and the positioning ring can be opened and closed in half. Tightening handles are provided on the measuring ring and the positioning ring to adjust the tightness by tightening the handles.

[0015] Preferably, the positioning ring is provided with a plurality of equal-height columns, the number of which is at least 3, and the equal-height columns are evenly installed on the upper surface of the positioning ring, and the heights of all the equal-height columns are equal.

[0016] Preferably, the precision measuring component further comprises a lifting bolt plate and a plurality of lifting bolts, wherein the lifting bolts are mounted on the lifting bolt plate, and the lifting bolt plate is mounted on the inner side of the measuring circle.

[0017] The beneficial effects of the utility model are:

[0018] This new design utilizes a linked drive assembly with a speed reducer to achieve synchronized, high-precision tightening of multiple jack bolts. This design eliminates the angular deviation and synchronization issues that can occur when a single motor is used, significantly improving installation efficiency and accuracy while ensuring the sealing performance of the thermocouple mechanical seal.

[0019] The torque limiter, connecting ratchet, and bolt connector are integrated into the tightening shaft, making torque control more precise. The torque limiter ensures that the predetermined torque value is not exceeded during tightening, preventing damage caused by overtightening; the connecting ratchet provides a stable torque transmission path, reducing energy loss. This design makes torque control more reliable and improves installation quality.

[0020] The utility model also integrates high-precision measurement components, including a measuring ring, a positioning ring, and a displacement sensor, which can monitor the height changes of the bolt in real time during the tightening process. This helps the operator accurately determine whether the bolt has reached the predetermined tightening position, avoids installation problems caused by improper height control, and further improves installation accuracy and reliability.

[0021] It realizes the automated operation of synchronous high-precision tightening and high-level monitoring, reduces the operator's stay time in the nuclear island environment and the chance of direct contact with radiation sources, thereby effectively reducing the radiation dose to personnel and ensuring the health and safety of operators. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of the tightening tool of the utility model;

[0023] Figure 2 It is a structural diagram of the measuring tool of the present utility model;

[0024] Figure 3 It is a schematic diagram of the control connection structure of the utility model.

[0025] In the figure: 1. Control console, 2. Measuring tool, 21. Precision measuring component, 211. Measuring circle, 212. Positioning circle, 213. Displacement sensor, 214. Tightening handle, 215. Equal height column, 216. Lifting bolt plate, 217. Lifting bolt, 22. Display device, 3. Tightening tool, 31. Linkage drive component, 311. Middle drive component, 3111. Left tightening gear, 31111. First tightening shaft, 3112. Right tightening gear , 31112, second tightening shaft, 312, left tightening component, 31113, third tightening shaft, 31115, fifth tightening shaft, 313 right tightening component, 31114, fourth tightening shaft, 31116, sixth tightening shaft, 314, locking hole, 315, locking pin, 316, opening and closing handle, 32, reducer, 321, power input shaft, 33, torque limiter, 34, connecting ratchet, 35, bolt connector, 36, synchronous belt. DETAILED DESCRIPTION

[0026] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0027] like Figure 1-3 As shown, the utility model is a thermocouple tightening bolt synchronous high-precision tightening and height monitoring tool, including a console 1, a measuring tool 2 and a tightening tool 3, the tightening tool 3 includes a linkage drive component 31 and a reducer 32, the measuring tool 2 includes a precision measuring component 21 and a display device 22, the precision measuring component 21 is sleeved on the test workpiece to prepare for the precision position test, the precision measuring component 21 is connected to the console 1 to feedback the test information, the display device 22 is connected to the console 1 to display the test information of the precision measuring component 21, the linkage drive component 31 is installed below the reducer 32 for tightening the tightening bolts on the test workpiece, the reducer 32 is connected to the console 1 to receive the control information of the console 1 and then move, the top of the reducer 32 inputs power through the power input shaft 321, and the lower end of the reducer 32 is connected to the drive component 31.

[0028] By adopting the above technical solution, the coordinated operation of the linkage drive component 31 and the reducer 32 enables the synchronous tightening of multiple jack bolts. This design eliminates the angular deviation and synchronization issues that may occur when a single motor is driven, ensuring that all bolts maintain a high degree of consistency and precision during the tightening process. The control console 1 serves as the hub of the entire system, responsible for receiving and processing information from the measuring tool 2 and tightening tool 3 and issuing corresponding control instructions. The tool can achieve automated tightening and high-level monitoring, reducing the operator's time in the nuclear island environment and the opportunity for direct exposure to radiation sources.

[0029] The linkage driving component 31 includes a middle driving component 311 , a left tightening component 312 and a right tightening component 313 . The left tightening component 312 and the right tightening component 313 are both mounted on the middle driving component 311 , and the reducer 32 is connected to the upper end of the middle driving component 311 .

[0030] By adopting the above technical solution, the left tightening component 312 and the right tightening component 313 achieve synchronous movement through the middle driving component 311, ensuring the synchronization of the tightening bolts on both sides during the tightening process, and effectively avoiding the angular deviation and synchronization problems caused by separate driving. The left tightening component 312 and the right tightening component 313 are integrated on the middle driving component 311 and driven uniformly by the reducer 32, making the structure of the entire tightening tool 3 more compact.

[0031] The outer sides of the left tightening component 312 and the right tightening component 313 are both provided with locking holes 314, and the locking holes 314 close and fix the left tightening component 312 and the right tightening component 313 through locking pins 315. The tops of the left tightening component 312 and the right tightening component 313 are both provided with opening and closing handles 316.

[0032] By adopting the above technical solution, the design of the locking hole 314 and the locking pin 315 enables the left tightening component 312 and the right tightening component 313 to be closed and fixed conveniently and quickly without the need for complicated tools or tedious steps. The left tightening component 312 and the right tightening component 313 are firmly fixed together by the locking pin 315, thereby enhancing the structural stability of the entire linkage drive component 31. The setting of the opening and closing handle 316 allows the operator to easily adjust the relative position between the left tightening component 312 and the right tightening component 313 to adapt to tightening bolts of different specifications and layouts.

[0033] The middle driving component 311 includes a left tightening gear 3111 and a right tightening gear 3112. The bottom of the left tightening gear 3111 is connected to the first tightening shaft 31111, and the bottom of the right tightening gear 3112 is connected to the second tightening shaft 31112. The reducer 32 is connected to the left tightening gear 3111 and the right tightening gear 3112.

[0034] By adopting the above technical solution, the left tightening gear 3111 and the right tightening gear 3112 achieve synchronous rotation through a common driving source (i.e., the reducer 32), ensuring the synchronization of the tightening components on the left and right sides during the tightening process, avoiding the angular deviation caused by separate driving, and improving the tightening accuracy and consistency.

[0035] The left tightening component 312 is provided with a third tightening shaft 31113 and a fifth tightening shaft 31115, and the right tightening component 313 is provided with a fourth tightening shaft 31114 and a sixth tightening shaft 31116. The fifth tightening shaft 31115 is installed on the outside of the third tightening shaft 31113, and the sixth tightening shaft 31116 is installed on the outside of the fourth tightening shaft 31114.

[0036] By adopting the above technical solution, by providing two sets of tightening shafts (third tightening shaft 31113 and fifth tightening shaft 31115, and fourth tightening shaft 31114 and sixth tightening shaft 31116) on the left tightening component 312 and the right tightening component 313, respectively, it is possible to simultaneously tighten multiple tightening points of the same jack bolt or bolts in different positions, thereby increasing tightening flexibility and efficiency. This is particularly suitable for applications requiring multi-point fixation or enhanced tightening. The simultaneous action of multiple tightening shafts can disperse the tightening force, making the tightening process more uniform. This helps reduce stress concentration and deformation caused by overtightening at a single point, thereby improving the quality and stability of the overall installation.

[0037] The bottom of the first tightening shaft 31111, the second tightening shaft 31112, the third tightening shaft 31113, the fourth tightening shaft 31114, the fifth tightening shaft 31115 and the sixth tightening shaft 31116 are all provided with a torque limiter 33, a connecting ratchet 34 and a bolt connecting head 35. The torque limiter 33 is arranged at the lower end of the tightening shaft, the connecting ratchet 34 is installed at the lower end of the torque limiter 33, and the bolt connecting head 35 is installed at the lower end of the connecting ratchet 34.

[0038] By adopting the above technical solution, the setting of the torque limiter 33 can accurately control the torque applied by the tightening shaft during the tightening process. When the preset torque value is reached, the torque limiter will automatically cut off the power transmission to prevent over-tightening from causing damage to the bolt or deformation of the connector. The design of the connecting ratchet 34 enables the tightening shaft to maintain stable rotational motion during the tightening process, reducing energy loss and time delay caused by slipping or tooth jumping. The self-locking function of the ratchet can also prevent the tightening shaft from rotating in the opposite direction when tightening stops, ensuring the stability of the tightening effect. The bolt connector 35 is a connecting component between the tightening shaft and the bolt. Its design should ensure close fit and reliable connection with the bolt, which is conducive to reducing safety hazards caused by loose or falling connections and improving the stability and reliability of the overall structure.

[0039] The first tightening shaft 31111 , the third tightening shaft 31113 and the fifth tightening shaft 31115 are connected and moved via a synchronous belt 36 , and the second tightening shaft 31112 , the fourth tightening shaft 31114 and the sixth tightening shaft 31116 are connected and moved via a synchronous belt 36 .

[0040] By adopting the above technical solution, the synchronous belt 36 has excellent transmission synchronization, which can ensure that the connected tightening shafts remain highly synchronized during the rotation process. All tightening shafts start and stop rotating almost at the same time, avoiding the tightening torque difference caused by asynchrony and improving the consistency and accuracy of the tightening operation.

[0041] The precision measuring component 21 includes a measuring ring 211, a positioning ring 212 and several displacement sensors 213. The measuring ring 211 is installed above the positioning ring 212, and the displacement sensor 213 is installed at the bottom of the positioning ring 212. The measuring ring 211 and the positioning ring 212 can be opened and closed in half. Tightening handles 214 are provided on the measuring ring 211 and the positioning ring 212 to adjust the tightness by tightening the handles 214.

[0042] By adopting the above technical solution, the precise design and coordination of the measuring circle 211 and the positioning circle 212 can ensure stable and accurate positioning of the measured component during the test process, which is crucial for high-precision measurement and reduces measurement errors caused by inaccurate positioning. The displacement sensor 213 can monitor the tiny displacement changes of the measured component during the test in real time and convert these changes into electrical signals for recording and analysis. The high-precision displacement sensor can capture tiny deformations or displacements, providing a reliable basis for subsequent data analysis and processing. The precision measurement component 21 can adapt to measured components of different sizes and shapes. By adjusting the opening and closing degree of the measuring circle 211 and the positioning circle 212, components of various sizes can be easily clamped and positioned, thereby improving the flexibility and adaptability of the test component.

[0043] The positioning ring 212 is provided with a plurality of equal-height columns 215 . The number of the equal-height columns 215 is at least 3. The equal-height columns 215 are evenly installed on the upper surface of the positioning ring 212 , and the heights of all the equal-height columns 215 are equal.

[0044] By adopting the above technical solution, the heights of all the equal-height columns 215 are equal, ensuring that the gap between the measured component and the positioning ring 212 is uniform when placed. The uniform gap helps to reduce errors caused by uneven contact, making the measurement more accurate.

[0045] The precision measuring component 21 further includes a jacking bolt plate 216 and a plurality of jacking bolts 217 . The jacking bolts 217 are mounted on the jacking bolt plate 216 , and the jacking bolt plate 216 is mounted on the inner side of the measuring circle 211 .

[0046] By adopting the above technical solution, through the fixation of the lifting bolt plate 216 and the lifting bolts 217, the precision measurement component 21 can maintain better stability during the lifting and installation process, which is conducive to reducing measurement errors caused by shaking or instability of the component.

[0047] During the specific implementation of the present invention, first, the positioning ring 212 in the precision measurement component 21 is installed on the thermocouple assembly to ensure that the positioning ring 212 is stable and accurately positioned. The displacement sensor 213 and the display device 22 are connected through the console 1 to perform preliminary tests to ensure that all sensors are working properly and can accurately feedback data.

[0048] Install the measuring ring 211 onto the thermocouple assembly. At this time, the measuring ring 211 and the positioning ring 212 are in a half-open state. Screw the lifting bolt 217 to slowly lower the lifting bolt plate 216 until it contacts the equal-height columns 215 on the positioning ring 212. During this process, continuous adjustment is required to ensure that the lifting bolt plate 216 descends smoothly and the equal-height columns 215 are evenly stressed. Until the tightening bolt of the thermocouple assembly is in light contact with the tightening surface of the thermocouple, the displacement sensor 213 should be able to work normally and display the displacement value through the display device 22. After confirming that all settings are correct, press the reset button on the display device 22 to set the displacement value of the initial position to zero, providing an accurate starting point for subsequent tightening operations.

[0049] Install the tightening tool 3 onto the thermocouple assembly, ensuring that each bolt connector 35 is tightly fitted with the tightening bolt of the thermocouple assembly. Hold the electronic tightening gun with accurate parameters set, connect it to the input shaft 321 of the reducer 32, start the electronic tightening gun, and start the tightening operation. During the tightening process, the tightening tool 3 will automatically work according to the preset torque and number of turns until it reaches the set value and stops.

[0050] During the tightening process and after the tightening is completed, continue to observe the changes in data on the display device 22. The height display value needs to be confirmed whether it is within the normal accuracy range, and confirm that the tightening bolts of the thermocouple assembly have been tightened evenly and with high precision. After completing all tightening and monitoring work, remove the tightening tool 3 and the precision measuring component 21 in reverse order.

[0051] The various embodiments in the specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to in detail.

[0052] The above description of the disclosed embodiments will enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A thermocouple jacking bolt synchronous high-precision tightening and height monitoring tool, characterized by: The invention comprises a control console (1), a measuring tool (2) and a tightening tool (3), wherein the tightening tool (3) comprises a linkage driving component (31) and a reducer (32), the measuring tool (2) comprises a precision measuring component (21) and a display device (22), the precision measuring component (21) is sleeved on a test workpiece to prepare for a precision position test, the precision measuring component (21) is connected to the control console (1) to feed back test information, the display device (22) is connected to the control console (1) to display the test information of the precision measuring component (21), the linkage driving component (31) is installed below the reducer (32) and is used to tighten a tightening bolt on the test workpiece, the reducer (32) is connected to the control console (1) and moves after receiving control information from the control console (1), the top of the reducer (32) inputs power through a power input shaft (321), and the lower end of the reducer (32) is connected to the driving component (31).

2. The thermocouple jacking bolt synchronous high-precision tightening and height monitoring tool according to claim 1 is characterized in that: The linkage drive component (31) comprises a middle drive component (311), a left tightening component (312), and a right tightening component (313); the left tightening component (312) and the right tightening component (313) are both mounted on the middle drive component (311); and the reducer (32) is connected to the upper end of the middle drive component (311).

3. The thermocouple jacking bolt synchronous high-precision tightening and height monitoring tool according to claim 2 is characterized in that: The outer sides of the left tightening component (312) and the right tightening component (313) are both provided with locking holes (314), and the locking holes (314) close and fix the left tightening component (312) and the right tightening component (313) through the locking pin (315). The tops of the left tightening component (312) and the right tightening component (313) are both provided with opening and closing handles (316).

4. The thermocouple jacking bolt synchronous high-precision tightening and height monitoring tool according to claim 2 is characterized in that: The middle driving component (311) comprises a left tightening gear (3111) and a right tightening gear (3112); the bottom of the left tightening gear (3111) is connected to a first tightening shaft (31111); the bottom of the right tightening gear (3112) is connected to a second tightening shaft (31112); and the reducer (32) is connected to the left tightening gear (3111) and the right tightening gear (3112).

5. The thermocouple jacking bolt synchronous high-precision tightening and height monitoring tool according to claim 4 is characterized in that: The left tightening component (312) is provided with a third tightening shaft (31113) and a fifth tightening shaft (31115), and the right tightening component (313) is provided with a fourth tightening shaft (31114) and a sixth tightening shaft (31116), the fifth tightening shaft (31115) being mounted on the outside of the third tightening shaft (31113), and the sixth tightening shaft (31116) being mounted on the outside of the fourth tightening shaft (31114).

6. The thermocouple jacking bolt synchronous high-precision tightening and height monitoring tool according to claim 5, characterized in that: The bottoms of the first tightening shaft (31111), the second tightening shaft (31112), the third tightening shaft (31113), the fourth tightening shaft (31114), the fifth tightening shaft (31115) and the sixth tightening shaft (31116) are all provided with a torque limiter (33), a connecting ratchet (34) and a bolt connection head (35), the torque limiter (33) being arranged at the lower end of the tightening shaft, the connecting ratchet (34) being mounted at the lower end of the torque limiter (33), and the bolt connection head (35) being mounted at the lower end of the connecting ratchet (34).

7. The thermocouple jacking bolt synchronous high-precision tightening and height monitoring tool according to claim 5, characterized in that: The first tightening shaft (31111), the third tightening shaft (31113) and the fifth tightening shaft (31115) are connected and moved via a synchronous belt (36), and the second tightening shaft (31112), the fourth tightening shaft (31114) and the sixth tightening shaft (31116) are connected and moved via a synchronous belt (36).

8. The thermocouple jacking bolt synchronous high-precision tightening and height monitoring tool according to claim 1, characterized in that: The precision measuring component (21) includes a measuring ring (211), a positioning ring (212) and a plurality of displacement sensors (213). The measuring ring (211) is installed above the positioning ring (212), and the displacement sensor (213) is installed below the positioning ring (212). The measuring ring (211) and the positioning ring (212) can both be opened and closed in half. Tightening handles (214) are provided on the measuring ring (211) and the positioning ring (212). Tightness is adjusted by tightening the handles (214).

9. The thermocouple jacking bolt synchronous high-precision tightening and height monitoring tool according to claim 8, characterized in that: The positioning ring (212) is provided with a plurality of equal-height columns (215), the number of the equal-height columns (215) is at least 3, the equal-height columns (215) are evenly installed on the upper surface of the positioning ring (212), and the heights of all the equal-height columns (215) are equal.

10. The thermocouple jacking bolt synchronous high-precision tightening and height monitoring tool according to claim 8, characterized in that: The precision measuring component (21) further comprises a lifting bolt plate (216) and a plurality of lifting bolts (217), wherein the lifting bolts (217) are mounted on the lifting bolt plate (216), and the lifting bolt plate (216) is mounted on the inner side of the measuring circle (211).

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