Apparatus and method for measuring levelness of reactor pressure vessel head

Abstract

An apparatus (200) and method for measuring the levelness of a reactor pressure vessel head (100). The measuring apparatus (200) comprises a mounting and fixing mechanism (10), a tilt angle sensor mounting base (20), and a tilt angle sensor (30). The mounting and fixing mechanism (10) comprises a mounting bottom plate (11) and a fixing mechanism (12) located on the mounting bottom plate (11). The fixing mechanism (12) is configured to be fixed to the lower end face of the head (100). The tilt angle sensor mounting base (20) comprises a bearing plate (21) and a door-shaped frame (22) arranged on the bearing plate (21). The bearing plate (21) is located on the mounting bottom plate (11). A top surface (S1) of the door-shaped frame (22) is attached to a sealing surface (b) of the head (100). The tilt angle sensor (30) is mounted on a sensor mounting surface (S2) of the bearing plate (21) and is located in the door-shaped frame (22). The tile angle sensor (30) is configured to acquire the levelness of the sealing surface (b) of the head (100) by measuring the levelness of the sensor mounting surface (S2) of the bearing plate (21). The sensor mounting surface (S2) of the bearing plate (21) is parallel to the sealing surface (b) of the head (100).

Description

Reactor pressure vessel top cover horizontality measuring device and measuring method Technical Field

[0001] The present application belongs to the technical field of reactor pressure vessel top cover levelness measurement, and specifically relates to a reactor pressure vessel top cover levelness measurement device and a measurement method thereof. Background Art

[0002] The reactor pressure vessel head is a key piece of equipment in the nuclear island and a crucial component of the primary system's pressure boundary. A pressurized water reactor pressure vessel consists of a cylinder and a head, which are tightly compressed by sealing rings and surfaces to form a primary safety barrier. Lifting and reinstalling the head is a critical operation during periodic refueling overhauls. According to reinstallation procedures, the head sealing surface must be level at 0.25 mm / m to ensure that the sealing rings or surfaces are not damaged during assembly, thus ensuring effective sealing of the primary circuit. However, the head has a diameter of approximately 4 meters and weighs approximately 100 tons. Furthermore, the head storage room where leveling is performed is subject to high doses and limited space. Therefore, measuring head levelness is both crucial and challenging.

[0003] Currently, roof leveling operations generally use levels or total stations for measurement, and the roof hoist is adjusted based on the measurement results. This process requires manual visual readings and repeated multi-point measurements, and is greatly affected by the ground levelness of the roof storage room. Not only is it inefficient and time-consuming, but it also requires a large number of workers on site, which increases the collective radiation dose of the workers. This method has obvious shortcomings in measurement efficiency. Patent publication number CN114093538A, entitled "Pressurized Water Reactor Pressure Vessel Top Cover Levelness Measurement and Adjustment Device and Method," proposes a levelness measurement method using a laser level and a mobile measuring end. Although it has the advantages of automatic reading and directional measurement, its actual application may face disadvantages such as the inability to measure local points due to obstruction of the laser measurement path, and large measurement errors due to the wide laser beam line at long distances.

[0004] Summary of the Invention

[0005] In view of this, the embodiments of the present application are dedicated to providing a device and method for measuring the horizontality of a reactor pressure vessel top cover, so as to solve the problems existing in the existing measurement of the horizontality of a reactor pressure vessel top cover, such as large measurement errors and inability to measure local points.

[0006] In a first aspect, the present application provides a device for measuring the horizontality of a reactor pressure vessel top cover, the device comprising a mounting and fixing mechanism, an inclination sensor mounting seat and an inclination sensor. The mounting and fixing mechanism comprises a mounting base plate and a fixing mechanism located on the mounting base plate. The fixing mechanism is configured to be fixed to the lower end face of the top cover. The inclination sensor mounting seat comprises a bearing plate and a gantry disposed on the bearing plate. The bearing plate is located on the mounting base plate. The top surface of the gantry is in contact with the sealing surface of the top cover. The inclination sensor is mounted on the sensor mounting surface of the bearing plate and is located within the gantry. The inclination sensor is configured to obtain the horizontality of the sealing surface of the top cover by measuring the horizontality of the sensor mounting surface of the bearing plate. The sensor mounting surface of the bearing plate is parallel to the sealing surface of the top cover.

[0007] In the above scheme, by setting the top surface of the gantry in the measuring device to fit with the sealing surface of the top cover, and the sensor mounting surface of the supporting plate to be parallel to the sealing surface of the top cover, after the top surface of the gantry is completely fitted with the sealing surface of the top cover, the horizontality of the sealing surface of the top cover is consistent with the horizontality of the sensor mounting surface. Therefore, without the need to invert the inclination sensor, the horizontality of the sealing surface of the top cover can be indirectly measured by using the horizontality of the sensor mounting surface of the supporting plate of the inclination sensor. This can solve the problem that the inclination sensor cannot directly measure the sealing surface of the top cover, and is conducive to the operator to automatically obtain the overall horizontality data of the top cover in real time, making the measurement results more intuitive, avoiding large measurement errors caused by manual visual readings, and reducing the number of operators required for on-site operations, reducing personnel costs, and avoiding the shortcomings of being unable to measure local points due to obstruction of the laser measurement path and large measurement errors caused by the large width of the long-distance laser beam.

[0008] In a specific implementation of the present application, the measuring device further includes an adaptive fitting mechanism, which is mounted on a mounting base, and a supporting plate mounted on the adaptive fitting mechanism.

[0009] In one specific implementation of the present application, the adaptive fitting mechanism includes multiple spring assemblies, multiple adjustment washers, and a pressure cover. The multiple adjustment washers are respectively installed in multiple grooves on the mounting base. The multiple spring assemblies are respectively located on the multiple adjustment washers. The pressure cover is fixedly connected to the mounting base via flange bolts and also secures the multiple spring assemblies.

[0010] In a specific implementation of the present application, the depth of the groove is greater than the thickness of the adjustment gasket.

[0011] In one specific implementation of the present application, the fixing mechanism includes a support member, a magnetic base, a connecting post, and an adjustment nut. The support member is positioned on the mounting base. One end of the connecting post is connected to a threaded hole in the magnetic base via an external thread. The other end of the connecting post is secured to the support member via an adjustment nut. The magnetic base is configured to be fixed to the lower end surface of the top cover via magnetic attraction.

[0012] In a specific implementation of the present application, the fixing mechanism further includes a positioning block. The positioning block is located outside the magnetic base and is configured to locate the fixed position of the magnetic base and the top cover.

[0013] In a specific implementation of the present application, the positioning block includes a support platform and at least one positioning column located on the support platform. The positioning column is configured to abut against a side wall of the top cover.

[0014] In a specific implementation of the present application, the gantry includes two uprights and a crossbeam installed between the two uprights. The orthographic projection of one end of the upright facing the mounting base on the mounting base is located within the orthographic projection of one end of the upright facing away from the mounting base on the mounting base.

[0015] In a specific implementation of the present application, the tilt sensor includes a wireless module and a battery module. The wireless module is configured to remotely transmit levelness data wirelessly. The battery module is configured to power the wireless module.

[0016] The second aspect of the present application provides a method for measuring the horizontality of a reactor pressure vessel top cover, which comprises: fixing a device for measuring the horizontality of a reactor pressure vessel top cover according to the first aspect of the present application to the top cover; measuring the horizontality of a sensor mounting surface of a support plate in the measuring device using an inclination sensor in the measuring device; and determining the horizontality of a sealing surface of the top cover based on the horizontality of the sensor mounting surface of the support plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] FIG1 is a schematic structural diagram of the reactor pressure vessel top cover.

[0018] FIG2 is a schematic structural diagram of the reactor pressure vessel top cover from a top view.

[0019] FIG3 is a schematic structural diagram of a device for measuring the horizontality of a reactor pressure vessel top cover provided in one embodiment of the present application.

[0020] FIG4 is a schematic structural diagram of the inclination sensor mounting base in the measuring device of the embodiment shown in FIG3 .

[0021] FIG5 is a schematic top view of the measuring device of the embodiment shown in FIG3 .

[0022] FIG6 is a schematic structural diagram showing a device for measuring the horizontality of a reactor pressure vessel top cover and the corresponding fitting of the top cover, provided in one embodiment of the present application.

[0023] FIG7 is an exploded schematic diagram of a device for measuring the horizontality of a reactor pressure vessel top cover provided in one embodiment of the present application.

[0024] FIG8 is a flow chart showing a method for measuring the horizontality of a reactor pressure vessel top cover provided in one embodiment of the present application. DETAILED DESCRIPTION

[0025] After careful research, it was found that inclinometers, with their advantages of high measurement accuracy and simple reading, have replaced bubble levels and are widely used in measuring the levelness of electromechanical equipment, vehicles, and buildings. However, due to limitations such as the inability to measure inverted angles and the requirement for close contact, inclinometers are not currently suitable for roof leveling.

[0026] To address at least one of the above problems, the present application provides a device and method for measuring the horizontality of a reactor pressure vessel top cover. The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only a portion of the embodiments of the present application, not all of them. All other embodiments obtained by persons of ordinary skill in the art based on the embodiments of the present application without creative effort are within the scope of protection of this application.

[0027] FIG1 is a schematic diagram of the structure of the reactor pressure vessel top cover. FIG2 is a schematic diagram of the structure of the reactor pressure vessel top cover from a top view. As shown in FIG1 and FIG2, the reactor pressure vessel top cover 100 can be cylindrical, weighing approximately 100 tons, and stored upright in the top cover 100 storage room. The sealing surface of the top cover 100 is located at the bottom end face. The structure of the top cover 100 includes a bolt hole end face a, a flange sealing surface b, and a C-ring sealing groove c. The prerequisite for hoisting the top cover 100 is usually that the horizontality of the flange sealing surface b reaches 0.25 mm / m. Hereinafter, the flange sealing surface b will be collectively referred to as the sealing surface b of the top cover 100.

[0028] FIG3 is a schematic diagram of the structure of a device for measuring the horizontality of a reactor pressure vessel top cover, provided in one embodiment of the present application. FIG4 is a schematic diagram of the structure of a tilt sensor mounting base in the measuring device of the embodiment shown in FIG3. FIG5 is a schematic top view of the measuring device of the embodiment shown in FIG3. FIG6 is a schematic diagram of the structure of a device for measuring the horizontality of a reactor pressure vessel top cover, provided in one embodiment of the present application, corresponding to the top cover fitting.

[0029] As shown in Figures 3 to 6, the measuring device 200 includes a mounting and fixing mechanism 10, an inclination sensor mounting seat 20 and an inclination sensor 30. The mounting and fixing mechanism 10 includes a mounting base 11 and a fixing mechanism 12 located on the mounting base 11. The fixing mechanism 12 is configured to be fixed to the lower end surface of the top cover 100. The inclination sensor mounting seat 20 includes a bearing plate 21 and a gantry 22 arranged on the bearing plate 21. The bearing plate 21 is located on the mounting base 11. The top surface S1 of the gantry 22 is in contact with the sealing surface b of the top cover 100. The inclination sensor 30 is mounted on the sensor mounting surface S2 of the bearing plate 21 and is located inside the gantry 22. The inclination sensor 30 is configured to obtain the horizontality of the sealing surface of the top cover 100 by measuring the horizontality of the sensor mounting surface of the bearing plate 21. The sensor mounting surface of the bearing plate 21 is parallel to the sealing surface of the top cover 100. In this way, by setting the top surface of the gantry 22 in the measuring device 200 to fit the sealing surface of the top cover 100, and the sensor mounting surface of the supporting plate 21 to be parallel to the sealing surface of the top cover 100, after the top surface S1 of the gantry 22 is completely fitted with the sealing surface of the top cover 100, the horizontality of the sealing surface of the top cover 100 is consistent with the horizontality of the sensor mounting surface S2. Therefore, without the need to invert the inclination sensor 30, the horizontality of the sealing surface of the top cover 100 can be indirectly measured by using the horizontality of the sensor mounting surface of the supporting plate 21 of the inclination sensor 30. This can solve the problem that the inclination sensor 30 cannot directly measure the sealing surface of the top cover 100, and is conducive to the operator to automatically obtain the overall horizontality data of the top cover 100 in real time, making the measurement results more intuitive, avoiding large measurement errors caused by manual visual readings, reducing the number of operators required for on-site operations, reducing personnel costs, and avoiding the shortcomings of being unable to measure local points due to obstruction of the laser measurement path and large measurement errors caused by the large width of the long-distance laser beam. In addition, the measuring device 200 is fitted to the sealing surface of the top cover 100 via the gantry 22 in the inclination sensor mounting base 20, and the inclination sensor 30 is mounted in the forward direction on the bearing plate 21 in the inclination sensor mounting base 20, making the installation of the measuring device 200 relatively convenient, quick, and stable. It can be installed in place once and for all without manual adjustment, and can continuously measure during the leveling operation of the top cover 100. Furthermore, the measuring device 200 occupies a small space and is lightweight, effectively saving operating space. Furthermore, the operator can use the acquired levelness data of the top cover 100 as a data reference for the leveling operation of the top cover 100, and automatically calculate the sling adjustment amount and provide an adjustment plan through the inclination sensor 30 combined with spatial trigonometric functions, thereby improving the efficiency of the leveling operation and the reliability of the equipment, while reducing the experience requirements of the operator for the leveling operation, and reducing the operation time and the radiation dose to the operator.

[0030] It should be noted that the measuring device 200 achieves rapid and efficient leveling by measuring the horizontality of the roof 100 and calculating the relative height differences of the roof's lifting points. The basic concept is to convert the spatial geometric relationship between the horizontality of the roof 100 and the three lifting points of the roof into a calculated height difference relative to the same reference plane. This height difference is then used to output the number of boom assembly rotations. Operators can then fine-tune the leveling plan repeatedly until the target is achieved.

[0031] The levelness of the sensor mounting surface S2 of the carrier plate 21 directly reflects the levelness of the sealing surface of the top cover 100. The sensor mounting surface S2 is used for forward mounting of the tilt sensor 30. The sensor mounting surface S2, the top surface S1 of the gantry 22, and the sealing surface of the top cover 100 are parallel to each other, for example, at a high degree of parallelism.

[0032] The inclination sensor 30 can be selected according to actual needs, as long as it can meet the measurement requirements of the horizontality of the sealing surface of the top cover 100. On this basis, the embodiments of the present application do not specifically limit the design of the structural setting and output parameter setting of the inclination sensor 30. For example, in some embodiments, the inclination sensor 30 can support the output of horizontality measurement values ​​in multiple units such as mm / m and °, which is convenient for staff to understand and select. For example, in some embodiments, the measurement accuracy of the inclination sensor 30 can be better than 0.001°, and the measurement range is ≥±5°. In this way, due to the high measurement accuracy of the inclination sensor 30, it is beneficial to use the measuring device 200 to accurately measure the horizontality of the top surface of the gantry 22, which in turn helps to improve the measurement accuracy of the horizontality of the sealing surface of the top cover 100.

[0033] The material of the sealing surface where the inclination sensor mounting base 20 and the top cover 100 meet can be determined based on actual needs, as long as it does not damage the sealing surface of the top cover 100. On this basis, the present embodiment does not impose any specific restrictions on the material of the sealing surface where the inclination sensor mounting base 20 and the top cover 100 meet. For example, in some embodiments, the material where the sealing surface where the inclination sensor mounting base 20 and the top cover 100 meet can be a high-strength non-metallic material such as polyetheretherketone (PEEK), thereby ensuring high accuracy without damaging the sealing surface of the top cover 100.

[0034] In the measuring device 200 provided in at least one embodiment of the present application, as shown in FIG3 , the measuring device 200 further includes an adaptive fitting mechanism 40. The adaptive fitting mechanism 40 is mounted on the mounting base 11. The carrier plate 21 is mounted on the adaptive fitting mechanism 40. In this way, by adding the adaptive fitting mechanism 40, the inclination sensor mounting seat 20 can be adaptively and quickly fitted when it is upwardly fitted with the sealing surface of the top cover 100 by utilizing the adaptive fitting mechanism 40, and there is no need to adjust the inclination sensor mounting seat 20 multiple times to achieve a better fitting effect between the contact surface of the inclination sensor mounting seat 20 and the top cover 100, thereby improving work efficiency and ensuring the accuracy of the measurement results of the inclination sensor 30.

[0035] In the measuring device 200 provided in at least one embodiment of the present application, as shown in FIG3 , the gantry 22 includes two uprights 221 and a crossbeam 222 mounted between the two uprights 221. The orthographic projection of the end of the upright 221 facing the mounting base 11 on the mounting base 11 is located within the orthographic projection of the end of the upright 221 facing away from the mounting base 11 on the mounting base 11. Thus, by arranging the orthographic projection of the end of the upright 221 facing the mounting base 11 on the mounting base 11 to be located within the orthographic projection of the end of the upright 221 facing away from the mounting base 11 on the mounting base 11, the upright 221 has a structure that is narrow at the top and wide at the bottom, thereby facilitating improved stability of the upright 221.

[0036] In the measuring device 200 provided in at least one embodiment of the present application, the inclination sensor 30 includes a wireless module and a battery module. The wireless module is configured to remotely and wirelessly transmit levelness data. The battery module is configured to power the wireless module. This allows operators to directly collect data remotely and wirelessly using a terminal such as a mobile phone, tablet, or computer, eliminating the inconvenience of cables during field use and significantly reducing radiation dose for field workers. Furthermore, the independent power supply provided by the battery module facilitates field operation.

[0037] Figure 7 shows an exploded view of a device for measuring the levelness of a reactor pressure vessel top cover, according to one embodiment of the present application. The embodiment shown in Figure 7 is a variation of the embodiment shown in Figure 3 . As shown in Figure 7 , the difference from the embodiment shown in Figure 3 lies in that the adaptive fitting mechanism 40 includes multiple spring assemblies 41, multiple adjustment washers 42, and a pressure cover 43. The multiple adjustment washers 42 are respectively installed in multiple grooves on the mounting base 11. The multiple spring assemblies 41 are respectively located on the multiple adjustment washers 42. The pressure cover 43 is fixedly connected to the mounting base 11 via flange bolts and also secures the multiple spring assemblies 41. As the inclination sensor mounting base 20 moves upward toward the sealing surface of the top cover 100, the lower spring assembly 41 is gradually compressed. The inclination sensor mounting base 20 maintains a certain degree of floating due to the combined elastic forces provided by the multiple spring assemblies 41 in the adaptive fitting mechanism 40. This facilitates quick and tight fitting of the inclination sensor mounting base 20 with the top cover 100, thereby reducing the difficulty of installing the measuring device 200. Furthermore, by providing an adjustment shim 42 below the spring assembly 41, the spring force of the spring assembly 41 under pressure can be adjusted using the adjustment shim 42, thereby facilitating optimal floating support. By providing a pressure cap 43 fixedly connected to the mounting base 11 via flange bolts and simultaneously securing multiple spring assemblies 41, the spring assembly 41 and the inclination sensor mounting base 20 are secured to the mounting base 11 while ensuring sufficient floating space for the inclination sensor mounting base 20. Furthermore, the mounting base 11 is located below the spring assembly 41, allowing the spring assembly 41 and the inclination sensor mounting base 20 to be supported, maintaining contact between the sealing surface of the inclination sensor mounting base 20 and the top cover 100.

[0038] In the measuring device 200 provided in at least one embodiment of the present application, the depth of the groove is greater than the thickness of the adjustment shim 42. Thus, by setting the depth of the groove greater than the thickness of the adjustment shim 42, a portion of the spring assembly 41 can be positioned within the groove, thereby maintaining a relatively fixed position of the spring assembly 41.

[0039] In the measuring device 200 provided in at least one embodiment of the present application, the fixing mechanism 12 includes a support member 121, a magnetic base 122, a connecting column 123 and an adjusting nut 124. The support member 121 is located on the mounting base 11. One end of the connecting column 123 is connected to the threaded hole on the magnetic base 122 by an external thread. The other end of the connecting column 123 is fixed and locked to the support member 121 by an adjusting nut 124. The magnetic base 122 is configured to be fixed to the lower end surface of the top cover 100 by magnetic attraction. In this way, the fixing mechanism 12 can be quickly fixed to the lower end surface of the top cover 100 by magnetic attraction using the magnetic base 122. Since the magnetic base 122 has a good magnetic attraction effect, it can be stably adsorbed during the normal lifting process of the top cover 100, thereby further ensuring the accuracy of the horizontality measurement result of the measuring device 200.

[0040] It should be noted that the support member 121 can slide on the connecting column 123 through the shaft sleeve. The support member 121 can be a part of the fixing mechanism 12 or a part independent of the fixing mechanism 12. For example, the support member 121 can be a part fixedly connected to the mounting base 11.

[0041] In the measuring device 200 provided in at least one embodiment of the present application, the fixing mechanism 12 further includes a positioning block 125. Positioning block 125 is located on the side of the magnetic base 122. Positioning block 125 is configured to locate the fixed position of the magnetic base 122 and the top cover 100. Thus, by adding positioning block 125, the relative position of the magnetic base 122 and the top cover 100 can be precisely determined using positioning block 125, thereby further ensuring the accuracy of the levelness measurement results of the measuring device 200.

[0042] In the measuring device 200 provided in at least one embodiment of the present application, the positioning block 125 includes a support platform 125a and at least one positioning post 125b located on the support platform 125a. The positioning post 125b is configured to abut against the side wall d of the top cover 100. Thus, through the contact between the at least one positioning post 125b and the side wall d of the top cover 100, the relative position of the inclination sensor 30 and the top cover 100 is quickly determined. When the operator is leveling the top cover 100, the installation position of the inclination sensor 30 and the measurement results can be used to accurately determine the horizontal state of the top cover 100 and perform the corresponding leveling operation.

[0043] It should be noted that the number of the at least one positioning post 125b can be one, two, three, or even more. In some embodiments, the number of the at least one positioning post 125b can be an even number, and the at least one positioning post 125b is symmetrical along the central axis of the top cover 100, so that the measurement axis of the tilt sensor 30 always passes through the center of the top cover 100.

[0044] Figure 8 is a flow chart of a method for measuring the levelness of a reactor pressure vessel top cover 100 according to an embodiment of the present application. As shown in Figure 8 , the measuring method includes the following steps.

[0045] S100: The reactor pressure vessel top cover horizontality measuring device in the embodiment of the present application is fixedly mounted on the top cover.

[0046] Specifically, the inclination sensor mounting base 20 in the measuring device 200 is pressed upward against the sealing surface of the top cover 100 until the inclination sensor mounting base 20 is tightly fitted to the top cover 100 .

[0047] S200: Using the inclination sensor in the measuring device, measure the horizontality of the sensor installation surface of the load-bearing plate in the measuring device.

[0048] S300: Determine the levelness of the sealing surface of the top cover according to the levelness of the sensor mounting surface of the carrier plate.

[0049] It should be noted that the method for measuring the horizontality of the reactor pressure vessel top cover is the corresponding method of the device for measuring the horizontality of the reactor pressure vessel top cover in the above embodiment of this application, and thus can achieve the corresponding technical effect, which will not be repeated here.

[0050] It should also be noted that the combination of the various technical features in the embodiments of the present application is not limited to the combination described in the embodiments of the present application or the combination described in the specific embodiments. All technical features described in the present application can be freely combined or combined in any way unless there is a contradiction between them.

[0051] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements, etc. made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

Claims

1. A device for measuring the horizontality of a reactor pressure vessel top cover, characterized in that: include: An installation fixing mechanism, comprising an installation base plate and a fixing mechanism located on the installation base plate, wherein the fixing mechanism is configured to be fixed to the lower end surface of the top cover; The tilt sensor mounting seat comprises a bearing plate and a gantry frame arranged on the bearing plate, wherein the bearing plate is located on the mounting bottom plate, and the top surface of the gantry frame is in contact with the sealing surface of the top cover; The inclination sensor is mounted on the sensor mounting surface of the bearing plate and is located in the gantry, and is configured to obtain the horizontality of the sealing surface of the top cover by measuring the horizontality of the sensor mounting surface of the bearing plate, wherein the sensor mounting surface of the bearing plate is parallel to the sealing surface of the top cover.

2. The measuring device according to claim 1, characterized in that Also includes: The self-adaptive fitting mechanism is mounted on the mounting base plate, wherein the bearing plate is mounted on the self-adaptive fitting mechanism.

3. The measuring device according to claim 2, characterized in that The adaptive fitting mechanism includes multiple spring groups, multiple adjustment gaskets and a pressure cover, wherein the multiple adjustment gaskets are respectively installed in multiple grooves on the mounting base plate, the multiple spring groups are respectively located on the multiple adjustment gaskets, and the pressure cover is fixedly connected to the mounting base plate through flange bolts and simultaneously fixes the multiple spring groups.

4. The measuring device according to claim 3, characterized in that The depth of the groove is greater than the thickness of the adjusting gasket.

5. The measuring device according to any one of claims 1 to 4, characterized in that The fixing mechanism includes a support, a magnetic base, a connecting column and an adjusting nut. The support is located on the mounting base plate. One end of the connecting column is connected to the threaded hole on the magnetic base through an external thread. The other end of the connecting column is fixed and locked with the supporting member through the adjusting nut, and the magnetic seat is configured to be fixed with the lower end surface of the top cover by magnetic attraction.

6. The measuring device according to claim 5, characterized in that The fixing mechanism further comprises a positioning block, the positioning block is located outside the magnetic base, and the positioning block is configured to locate the fixing position of the magnetic base and the top cover.

7. The measuring device according to claim 6, characterized in that The positioning block includes a support platform and at least one positioning column located on the support platform, wherein the positioning column is configured to abut against a side wall of the top cover.

8. The measuring device according to any one of claims 1 to 4, characterized in that The gantry frame includes two vertical frames and a crossbeam installed between the two vertical frames, wherein the orthographic projection of one end of the vertical frame facing the mounting base plate on the mounting base plate is located within the orthographic projection of one end of the vertical frame facing away from the mounting base plate on the mounting base plate.

9. The measuring device according to any one of claims 1 to 4, characterized in that The tilt sensor includes a wireless module and a battery module. The wireless module is configured to remotely transmit horizontality data wirelessly, and the battery module is configured to supply power to the wireless module.

10. A method for measuring the horizontality of a reactor pressure vessel top cover, characterized in that: include: A device for measuring the horizontality of a reactor pressure vessel top cover according to any one of claims 1 to 9 is fixedly mounted on the top cover; Using the inclination sensor in the measuring device to measure the horizontality of the sensor installation surface of the load-bearing plate in the measuring device; The levelness of the sealing surface of the top cover is determined according to the levelness of the sensor mounting surface of the bearing plate.

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