Reactive nut adjusting device of nuclear power station kingbolt stretcher

Abstract

The utility model relates to a reaction nut adjusting device for a nuclear power station kingbolt stretcher, which is used for adjusting the height of a reaction nut (5) of the stretcher and comprises a sleeve (1), a screwing pin (2), a bolt (3) and a rotating rod (4). The bolt (3) is connected with the sleeve (1), and the bolt (3) is used for connecting the sleeve (1) and the rotating rod (4); the rotating rod (4) is connected with the bolt (3), and the rotating rod (4) is used for driving the sleeve (1) to rotate; the screwing pin (2) is connected with the sleeve (1), and the screwing pin (2) is used for being matched with a reaction nut (5). Compared with the prior art, the adjusting device can well solve the problem that the stretching amount cannot meet the requirement, is simple in design, convenient to machine, manufacture and use, well matched with a bolt stretching machine, suitable for equipment of the same model of different power stations, and convenient to popularize and use.

Description

Technical Field

[0001] The utility model relates to the technical field of overhaul of reactor pressure vessel equipment in the nuclear power field, in particular to a reaction nut adjusting device for a main bolt stretching machine in a nuclear power plant. Background Technique

[0002] During the disassembly and assembly of the reactor, the stretching of the main bolts is an essential task. Currently, the domestic AP series pressurized water reactor types are basically similar, and bolt stretching machines are required for the stretching of the main bolts. When the nuclear power plant undergoes disassembly, assembly, and overhaul after each fuel cycle, during the removal or installation of the reactor integral top cover during refueling overhaul of the nuclear power plant, a bolt stretching machine is needed to stretch the main bolts to ensure that the main bolts are tightened or removed with appropriate pre-tightening force. For the integral stretching machine used, during the stretching of the main bolts, it is inevitable that the stretching amount fails to meet the specified range requirements. Because the integral bolt stretching machine stretches the main bolts through a reaction nut on the stretching machine, the reaction nut acts on the main bolts, and the stretching oil cylinder drives the reaction nut through the action of the high and low pressure cylinders, thereby realizing the stretching work. The numerical accuracy range of the stretching amount has high requirements and must be met. However, there are often individual cases where the stretching machine does not meet the stretching amount, which requires repeated bolt stretching work on the main bolts. This will result in a waste of construction period, delay the main line work, and also increase the risk of radioactive contamination of personnel in the refueling pool, increasing the individual and overall radiation dose intake. Therefore, there are strict requirements for the stretching amount of the integral stretching machine. For the stretching oil cylinder whose stretching amount cannot meet the requirements, special tools are needed to adjust to ensure normal stretching. The common solution for other domestic units using integral stretching machines is to perform secondary stretching on the main bolts. However, since the stretching amount of the reaction nut itself is insufficient, secondary stretching may not solve this problem, and there is no suitable and universal special tool or device for effective adjustment.

[0003] The bolt stretching work is the main line work task during refueling overhaul, with a tight schedule, heavy tasks, a large number of participating personnel, a complex working environment, and a high radiation protection risk. At the same time, in order to ensure that the stretching amount can meet the requirements for the disassembly and assembly of the integral top cover and avoid unnecessary dose exposure of personnel, it is urgent to develop an adjusting device for the reaction nut to adjust the height of the reaction nut of the stretching machine to ensure that the stretching amount meets the requirements. The adjusting device for the reaction nut plays an important role in the quality control of the disassembly and assembly work of the reactor and the process of avoiding radiation protection-related risks. Content of the Utility Model

[0004] The purpose of the present utility model is to overcome the defects existing in the above-mentioned prior art and provide an adjusting device for the reaction nut of the main bolt tensioning machine in a nuclear power plant. By setting a sleeve, a screwing pin, a bolt, and a rotating rod, the screwing pin cooperates with the reaction nut, which can well solve the situation where the stretching amount cannot meet the requirements. Moreover, this device has a simple design, is convenient for processing and manufacturing, and is easy to use. It well adapts to the bolt tensioning machine and is applicable to the same type of equipment in different power plants, facilitating popularization and use.

[0005] The purpose of the present utility model can be achieved through the following technical solutions:

[0006] The purpose of the present utility model is to provide an adjusting device for the reaction nut of the main bolt tensioning machine in a nuclear power plant. The adjusting device is used to adjust the height of the reaction nut of the tensioning machine. The adjusting device includes a sleeve, a screwing pin, a bolt, and a rotating rod; the bolt is connected to the sleeve, and the bolt is used to connect the sleeve and the rotating rod; the rotating rod is connected to the bolt, and the rotating rod is used to drive the sleeve to rotate; the screwing pin is connected to the sleeve, and the screwing pin is used to cooperate with the reaction nut.

[0007] Furthermore, the adjusting device is made of stainless steel, and the sleeve, the screwing pin, the bolt, and the rotating rod are all made of stainless steel.

[0008] Furthermore, the sleeve includes a cylinder body and a top cover connected to the cylinder body; the bolt is fixedly connected to the top cover of the sleeve; the screwing pin is fixedly connected to the outer side wall of the cylinder body of the sleeve.

[0009] Furthermore, the screwing pin and the sleeve are connected by welding.

[0010] Furthermore, the top bolt and the sleeve are connected by welding.

[0011] Furthermore, the rotating rod includes a rotating rod and a connecting rod connected to the rotating rod, and the connecting rod is connected to the bolt.

[0012] Furthermore, the rotating rod and the connecting rod are perpendicularly arranged.

[0013] Furthermore, a plurality of screwing pins are provided, and the plurality of screwing pins are evenly arranged along the circumferential direction of the sleeve.

[0014] Furthermore, 4 screwing pins are provided, and the adjacent two of the 4 screwing pins are distributed at an interval of 90°.

[0015] Furthermore, the reaction nut is provided with a flat top and a counterbore part connected to the flat top; a limiting hole is opened at the connection of the flat top and the counterbore part; the width of the limiting hole matches the width of the screwing pin to limit the screwing pin.

[0016] Further, the axes of the reaction nut and the adjusting device are on the same straight line.

[0017] Further, the reaction nut is provided with a hollow hole, and the hole wall of the hollow hole is connected to the counterbore portion; the measuring rod is arranged in the hollow hole of the reaction nut, and the measuring rod can be used for...

[0018] Further, the bolt includes a bolt head; a connecting hole is provided at the bottom of the rotating rod; the size of the connecting hole matches the size of the bolt head to rotate the bolt through the rotating rod.

[0019] Further, the connecting hole is opened at the bottom of the connecting rod.

[0020] Further, the stretching machine includes a reaction nut; the stretching machine further includes a hydraulic cylinder; the hydraulic cylinder is sleeved on the reaction nut to drive the reaction nut to perform stretching.

[0021] Further, the stretching machine is used to stretch the main bolt; the reaction nut is connected to the main bolt.

[0022] Further, the main bolt is located at the center of the reaction nut hole; the axes of the main bolt, the reaction nut, and the adjusting device are on the same straight line.

[0023] Further, the adjusting device mainly includes a sleeve device adapted to the top of the reaction nut, a screwing stud, a rotating rod, etc. By acting on the top of the reaction nut through the adjusting device, a person can apply an appropriate rotational torque to complete the adjustment of the height of the reaction nut, thereby ensuring that the stretching amount is within a suitable range. It can effectively solve the technical problem that the stretching amount is insufficient after the main bolt is stretched and cannot meet the requirements even through secondary stretching, avoid the waste of manpower, material resources and construction period caused by stretching the bolt multiple times, and greatly reduce the working risk. When designing and manufacturing the adjusting device, in order to better adapt to the reaction nut on the stretching machine, the design accuracy of the tool is relatively high, and size measurement and tool verification are required. Therefore, it is necessary to prepare the dimensional tolerance required to adapt to the reaction nut to ensure the effective use of the tool.

[0024] Compared with the prior art, the present utility model has the following beneficial effects:

[0025] 1) A reaction nut adjusting device for a main bolt stretching machine of a nuclear power plant provided by the present technical solution can well solve the situation where the stretching amount cannot meet the requirements by setting a sleeve, a screwing stud, a bolt, and a rotating rod. The screwing stud cooperates with the reaction nut. Moreover, this device has a simple design, is convenient for processing and manufacturing, and is easy to use. It well adapts to the bolt stretching machine and is applicable to the same type of equipment in different power plants, facilitating popularization and use.

[0026] 2) The reaction nut adjustment device for the main bolt tensioning machine of a nuclear power plant provided by this technical solution is simply assembled with the reaction nut of the bolt tensioning machine, not restricted by the surrounding environment, without interference, and the applied torque is uniform and reliable, enabling effective adjustment of the relative position of the reaction nut.

[0027] 3) The reaction nut adjustment device for the main bolt tensioning machine of a nuclear power plant provided by this technical solution has mechanical properties and strength meeting the usage requirements. The screwing stud and the sleeve body, as well as the top bolt and the sleeve body, are connected by welding to ensure reliable force application during use. The rotating rod can also be replaced with other suitable socket wrenches for use, which is simple and convenient.

[0028] 4) The reaction nut adjustment device for the main bolt tensioning machine of a nuclear power plant provided by this technical solution calibrates and adjusts the stretching amount of the reaction nut in advance in an environment with relatively low risk before the integral tensioning machine enters the refueling pool for assembly. In this way, personnel do not need to carry out this work in a place with relatively high risk such as the refueling pool, greatly reducing the radiation dose level. At the same time, it ensures that the stretching amount can reach the specified standard range at one time during the main bolt tensioning process, avoiding the need for secondary tensioning work due to unmet data, ensuring the maintenance quality and the progress of the main line work of the refueling outage, improving the stretching efficiency, and reducing the risk. It can effectively solve the technical problem that the stretching amount is insufficient after the main bolt is tensioned and cannot meet the requirements even through secondary tensioning, avoiding waste of manpower, material resources, and construction period caused by multiple bolt tensionings, and greatly reducing the work risk. It is light in weight, small in size, convenient to carry and use, does not generate other foreign objects, does not damage key equipment, and can accurately ensure that the stretching amount reaches the appropriate range, very suitable for the usage needs of the bolt tensioning machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a cross-sectional schematic diagram of the reaction nut adjustment device for the main bolt tensioning machine of a nuclear power plant in the embodiment of the present invention.

[0030] Figure 2 It is an assembled plane schematic diagram of the reaction nut adjustment device for the main bolt tensioning machine of a nuclear power plant in the embodiment of the present invention (cooperating with the reaction nut of the tensioning machine).

[0031] Figure 3 It is an assembled three-dimensional schematic diagram of the reaction nut adjustment device for the main bolt tensioning machine of a nuclear power plant in the embodiment of the present invention (cooperating with the reaction nut of the tensioning machine, only showing the top part structure of the reaction nut of the tensioning machine, without affecting the understanding of the cooperation between the adjustment device and the reaction nut).

[0032] Figure 4Assembly three-dimensional explosion schematic diagram of the reaction nut adjustment device of the main bolt tensioning machine in the nuclear power plant in the embodiment of the present utility model (cooperating with the reaction nut of the tensioning machine, only showing the top part structure of the reaction nut of the tensioning machine, which does not affect the understanding of the cooperation between the adjustment device and the reaction nut).

[0033] Figure 5 Three-dimensional structure schematic diagram of the reaction nut adjustment device of the main bolt tensioning machine in the nuclear power plant in the embodiment of the present utility model.

[0034] Figure 6 Separation schematic diagram of the connection hole of the screwing pin and the bolt head of the bolt in the reaction nut adjustment device of the main bolt tensioning machine in the nuclear power plant in the embodiment of the present utility model.

[0035] Figure 7 Cooperation schematic diagram of the limiting hole of the reaction nut and the screwing pin in the reaction nut adjustment device of the main bolt tensioning machine in the nuclear power plant in the embodiment of the present utility model.

[0036] Wherein:

[0037] 1. Sleeve; 1-1. Cylinder body; 1-2. Top cover; 2. Screwing pin; 3. Bolt; 3-1. Bolt head; 4. Rotating rod; 4-1. Connection hole; 4-2. Connecting rod; 4-3. Rotating rod; 5. Reaction nut; 5-1. Flat top; 5-2. Counterbore part; 5-3. Limiting hole; 5-4. Hollow hole; 6. Hydraulic cylinder; 7. Main bolt; 8. Measuring rod. Specific implementation mode

[0038] The present utility model will be described in detail below with reference to the accompanying drawings and specific embodiments. Features such as component models, material names, and connection structures that are not clearly described in this technical solution are all regarded as common technical features disclosed in the prior art.

[0039] In the present utility model, unless otherwise clearly defined and limited, terms such as "installation", "connection", "connection", "fixation" and other terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components; "up", "down", "left", "right", etc. are only used to represent relative position relationships. When the absolute position of the object being described changes, the relative position relationship may change. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0040] It should be noted that in the present utility model, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, such that a process, method, article or device comprising a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising one..." does not exclude the presence of additional identical elements in the process, method, article or device comprising the element.

[0041] The following further elaborates on the content of the present utility model in conjunction with specific embodiments.

[0042] Embodiment 1

[0043] As Figures 1 to 6 shown, in this embodiment, an adjusting device for the reaction nut of a main bolt tensioning machine in a nuclear power plant, the adjusting device is used to adjust the height of the reaction nut 5 of the tensioning machine, and the adjusting device includes a sleeve 1, a screwing stud 2, a bolt 3, and a rotating rod 4; the bolt 3 is connected to the sleeve 1, and the bolt 3 is used to connect the sleeve 1 and the rotating rod 4; the rotating rod 4 is connected to the bolt 3, and the rotating rod 4 is used to drive the sleeve 1 to rotate; the screwing stud 2 is connected to the sleeve 1, and the screwing stud 2 is used to cooperate with the reaction nut 5.

[0044] The adjusting device is made of stainless steel material, and the sleeve 1, the screwing stud 2, the bolt 3, and the rotating rod 4 are all made of stainless steel.

[0045] The sleeve 1 includes a cylinder body 1-1 and a top cover 1-2 connected to the cylinder body 1-1; the bolt 3 is fixedly connected to the top cover 1-2 of the sleeve 1; the screwing stud 2 is fixedly connected to the outer side wall of the cylinder body 1-1 of the sleeve 1.

[0046] The screwing stud 2 is connected to the sleeve 1 by welding.

[0047] The top bolt 3 is connected to the sleeve 1 by welding.

[0048] The rotating rod 4 includes a rotating rod 4-3 and a connecting rod 4-2 connected to the rotating rod 4-3, and the connecting rod 4-2 is connected to the bolt 3.

[0049] The rotating rod 4-3 and the connecting rod 4-2 are perpendicularly arranged.

[0050] Four screwing studs 2 are provided, and the four screwing studs 2 are evenly arranged along the circumferential direction of the sleeve 1. The adjacent two of the four screwing studs 2 are distributed at an interval of 90°, and are arranged at the same height of the cylinder body 1-1.

[0051] The reaction nut 5 is provided with a flat top 5-1 and a counterbore part 5-2 connected to the flat top 5-1; a limiting hole 5-3 is opened at the connection part of the flat top 5-1 and the counterbore part 5-2; the width of the limiting hole 5-3 matches the width of the screwing stud 2. Here, the matching means that the width of the limiting hole 5-3 can ensure that the screwing stud 2 is inserted into the limiting hole 5-3 to limit the screwing stud 2.

[0052] The axis of the reaction nut 5 and the axis of the adjusting device are on the same straight line.

[0053] The bolt 3 includes a bolt head 3-1; a connecting hole 4-1 is provided at the bottom of the rotating rod 4; the shape and size of the connecting hole 4-1 match the shape and size of the bolt head 3-1 to rotate the bolt 3 through the rotating rod 4. The bolt head is hexagonal, the connecting hole is a hexagonal shape matching it, and the tolerance fit between the connecting hole 4-1 and the bolt head 3-1 should be just right, and the machining accuracy should be within ±0.1 mm.

[0054] The connecting hole 4-1 is opened at the bottom of the connecting rod 4-2.

[0055] The stretching machine includes a reaction nut 5; the stretching machine further includes a hydraulic cylinder 6; the hydraulic cylinder 6 is sleeved on the reaction nut 5 and is used to drive the reaction nut 5 to stretch.

[0056] The stretching machine is used to stretch the main bolt 7; the reaction nut 5 is connected to the main bolt 7.

[0057] The main bolt 7 is located at the center of the hole of the reaction nut 5; the axis of the main bolt 7, the axis of the reaction nut 5, and the axis of the adjusting device are on the same straight line.

[0058] The reaction nut 5 is further provided with a hollow hole 5-4, and the hole wall of the hollow hole 5-4 is connected to the counterbore part 5-2; a measuring rod 8 is arranged in the hollow hole 5-4 of the reaction nut 5. The measuring rod 8 can be used to measure the height of the reaction nut 5. The top end of the measuring rod 8 is lower than the inner wall of the top cover 1-2 of the sleeve 1 or abuts against the inner wall of the top cover 1-2 of the sleeve 1. The measuring rod 8 can adopt a commercially available telescopic height measuring rod.

[0059] The stretching machine is a bolt stretching machine, and the working principle of the bolt stretching machine is not improved in this application.

[0060] The working method of the reaction nut adjusting device of the above-mentioned nuclear power plant main bolt stretching machine includes the following steps:

[0061] The adjusting device is adapted to the top of the reaction nut 5 of the bolt stretching machine by screwing the stud 2. The rotating rod 4 is connected to the bolt 3. By screwing the rotating rod 4, the reaction nut 5 is driven to rotate, so as to adjust the relative height with the hydraulic cylinder 6. By measuring the height of the measuring rod 8, the relative height of the reaction nut 5 and the hydraulic cylinder 6 is made to meet the stroke when the hydraulic cylinder 6 is pressurized, so as to ensure that the stretching amount meets the requirements of the appropriate range.

[0062] Embodiment 2

[0063] On the basis of Embodiment 1, this embodiment further includes the following settings:

[0064] The tolerance fit between the rotating stud 2 and the limit hole 5-3 should be just right. Here, it means that after the rotating stud 2 is inserted into the limit hole 5-3, both sides are in contact with the hole wall of the limit hole 5-3 to avoid shaking during use. The machining accuracy should be within ±0.1 mm. If the fit clearance is too large, the adjusting device may be unevenly stressed and shake during use, unable to effectively adjust the height of the reaction nut, and it is easy to damage the equipment.

[0065] The above description of the embodiments is to enable those of ordinary skill in the art to understand and use the utility model. It is obvious that those skilled in the art can easily make various modifications to these embodiments and apply the general principles described herein to other embodiments without creative labor. Therefore, the present utility model is not limited to the above embodiments, and the improvements and modifications made by those skilled in the art without departing from the scope of the present utility model according to the disclosure of the present utility model should be within the protection scope of the present utility model.

Claims

1. A reaction nut adjustment device for a main bolt tensioner in a nuclear power plant, the adjustment device being used to adjust the height of a reaction nut (5) of the tensioner, characterized in that: The adjusting device comprises a sleeve (1), a screw pin (2), a bolt (3), and a rotating rod (4); The bolt (3) is connected to the sleeve (1), and the bolt (3) is used to connect the sleeve (1) and the rotating rod (4); The rotating rod (4) is connected to the bolt (3), and the rotating rod (4) is used to drive the sleeve (1) to rotate; The screw pin (2) is connected to the sleeve (1), and the screw pin (2) is used to cooperate with the reaction nut (5).

2. A reaction nut adjustment device for a main bolt tensioner in a nuclear power plant according to claim 1, characterized in that: The sleeve (1) comprises a cylinder (1-1) and a top cover (1-2) connected to the cylinder (1-1); The bolt (3) is fixedly connected to the top cover (1-2) of the sleeve (1); The screw pin (2) is fixedly connected to the outer side wall of the cylinder body (1-1) of the sleeve (1).

3. A reaction nut adjustment device for a main bolt tensioner in a nuclear power plant according to claim 1, characterized in that: A plurality of screw pins (2) are provided, and the plurality of screw pins (2) are evenly arranged along the circumference of the sleeve (1).

4. A reaction nut adjustment device for a main bolt tensioner in a nuclear power plant according to claim 3, characterized in that: Four screw pins (2) are provided, and two adjacent screw pins (2) among the four screw pins (2) are spaced 90 degrees apart.

5. A reaction nut adjustment device for a main bolt tensioner in a nuclear power plant according to claim 1, characterized in that: The reaction nut (5) is provided with a flat top portion (5-1) and a countersunk hole portion (5-2) connected to the flat top portion (5-1); A limiting hole (5-3) is provided at the junction of the flat top portion (5-1) and the countersunk hole portion (5-2); The width of the limiting hole (5-3) matches the width of the screw pin (2) so as to limit the position of the screw pin (2).

6. A reaction nut adjustment device for a main bolt tensioner in a nuclear power plant according to claim 5, characterized in that: The reaction nut (5) is provided with a hollow hole (5-4), and the hole wall of the hollow hole (5-4) is connected with the counterbore portion (5-2); The measuring rod (8) is arranged in the hollow hole (5-4) of the reaction nut (5), and the measuring rod (8) can be used to measure the height of the reaction nut (5).

7. A reaction nut adjustment device for a main bolt tensioner in a nuclear power plant according to claim 1, characterized in that: The bolt (3) comprises a bolt head (3-1); The bottom of the rotating rod (4) is provided with a connecting hole (4-1); The size of the connecting hole (4-1) matches the size of the bolt head (3-1) so that the bolt (3) can be rotated by the rotating rod (4).

8. The reaction nut adjustment device for a main bolt tensioner of a nuclear power plant according to claim 1, characterized in that: The stretching machine comprises a reaction nut (5); The stretching machine also includes a hydraulic cylinder (6); The hydraulic cylinder (6) is sleeved on the reaction nut (5) and is used to drive the reaction nut (5) to stretch.

9. A reaction nut adjustment device for a main bolt tensioner in a nuclear power plant according to claim 8, characterized in that: The stretching machine is used to stretch the main bolt (7); The reaction nut (5) is connected to the main bolt (7).

10. A reaction nut adjustment device for a main bolt tensioner in a nuclear power plant according to claim 9, characterized in that: The main bolt (7) is located at the center of the hole of the reaction nut (5); The axis of the main bolt (7), the axis of the reaction nut (5), and the axis of the adjustment device are on the same straight line.

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