Core detector guide support column adjustment tool

Abstract

This invention relates to the field of nuclear power equipment, and more particularly to an adjustment tool for a core detector guide support column. The adjustment tool includes: a gripper assembly, a support assembly, a lifting assembly, and a support lug operating rod; the support assembly includes an outer cylinder, a support sleeve, an end sleeve, and a fixing handle; the support sleeve is fitted onto the outside of the outer cylinder, its top connected to the end sleeve, and a fixing handle is welded to the side wall of the support sleeve; the side wall of the end sleeve also has two holes, upper and lower, with a groove between the holes; the lifting assembly includes a core rod, a push rod head, and a lifting handle; the lower end of the core rod is the push rod head; one end of the lifting handle passes through the end sleeve. The hole on the side wall connects to the upper end of the core rod; the lifting handle moves up and down along the slide groove and is engaged in the upper or lower hole for fixation; the core rod is a hollow structure, and the support ear operating rod is inserted into the core rod to adjust the opening and closing of the support ear; the gripper assembly includes a gripper seat and grippers; the upper part of the gripper seat is connected to the outer cylinder, and a rotating shaft is installed on the lower part of the gripper seat, with one gripper installed on each rotating shaft; the gripper seat is a hollow structure, and the core rod passes through the gripper seat and the outer cylinder, with the push rod head located between the grippers, and the push rod head moving up and down to control the opening and closing of the grippers. This invention helps to realize the integrated function of online adjustment of the guide support column and opening and closing of the support ear.

Description

Technical Field

[0001] This invention relates to the field of nuclear power equipment, and more particularly to a tool for adjusting the guide support column of a reactor core detector. Background Technology

[0002] The "Hualong One" is a third-generation nuclear power unit independently developed and designed in my country. Its advantage is that it adopts an integrated reactor bottom design, which greatly ensures the safety of the reactor core under extreme operating conditions. Its core measurement system uses neutron-temperature detector components and water level detector components to enter the fuel interior from the upper reactor internals through the core detector guide structure (hereinafter referred to as IGA).

[0003] In existing technologies, a lifting device is used to introduce the core detector guide structure into the reactor. Summary of the Invention

[0004] The technical problem to be solved by this invention is to provide a core detector guide support column adjustment tool to replace the lifting tool, which facilitates remote grabbing, rotation, opening and closing, and helps to realize the integrated function of online adjustment of guide support column and opening and closing of support lug.

[0005] This invention provides a core detector guide support column adjustment tool, comprising: a gripper assembly, a support assembly, a lifting assembly, and a lug operating rod;

[0006] The support assembly includes an outer cylinder, a support sleeve, an end sleeve, and a fixing handle;

[0007] The support sleeve is fitted onto the outside of the outer cylinder, and its top is connected to the end sleeve. A fixed handle is welded to the side wall of the support sleeve.

[0008] The end sleeve is also provided with two holes, one above the other, with a groove between the holes;

[0009] The lifting assembly includes a core rod, a push rod head, and a lifting handle;

[0010] The lower end of the core rod is a push rod head;

[0011] One end of the lifting handle passes through a hole in the side wall of the end sleeve and connects to the upper end of the core rod; the lifting handle moves up and down along the slide groove and is engaged in the upper or lower hole to achieve fixation;

[0012] The core rod has a hollow structure, and the support lug operating rod is inserted into the core rod to adjust the opening and closing of the support lug;

[0013] The gripper assembly includes a gripper base and grippers;

[0014] The upper part of the gripper seat is connected to the outer cylinder, and the lower part of the gripper seat is equipped with a rotating shaft, with a gripper installed on each rotating shaft.

[0015] The gripper seat is a hollow structure, with the core rod passing through the gripper seat and the outer cylinder. The push rod head is located between the grippers, and the push rod head moves up and down to control the opening and closing of the grippers.

[0016] In one specific embodiment of the present invention, three rotating shafts are installed on the lower part of the gripper base, and a gripper is installed on each rotating shaft. The angle between each gripper is 120 degrees, and the width of the gripper is the same as the width of the mounting position on the gripper base.

[0017] There is a baffle at each end of the rotating shaft, and the baffle is fixed on the gripper seat.

[0018] In one specific embodiment of the present invention, the support lug operating rod is inserted through an end sleeve and passes through the interior of the core rod.

[0019] In one specific embodiment of the present invention, the lifting handle includes a handle housing, a spring, and a plug rod;

[0020] The insertion rod is connected to the core rod;

[0021] A spring is provided inside the handle housing;

[0022] The insertion rod passes through one side wall of the spring and handle housing;

[0023] When the handle housing is pulled outward, the insert rod moves up and down along the slide groove; when the handle housing is retracted, it engages with the hole on the side wall of the support sleeve, thus fixing the position of the core rod.

[0024] In one specific embodiment of the present invention, a hanging ring is provided on the fixed handle.

[0025] In one specific embodiment of the present invention, both the upper and lower ends of the support arm operating rod are hexagonal heads.

[0026] In one specific embodiment of the present invention, the distance between the two holes on the side wall of the support sleeve is 60-80 mm.

[0027] In one specific embodiment of the present invention, the bottom of the gripper is an outward-facing hook.

[0028] In one specific embodiment of the present invention, the inner diameter of the gripper seat is the same as that of the guide support column.

[0029] In one specific embodiment of the present invention, the gripper, push rod head and rotating shaft are made of 05Cr17Ni4Cu4Nb martensitic stainless steel and their strength is increased by heat treatment.

[0030] Compared with the prior art, the core detector guide support column adjustment tool of the present invention has the following advantages:

[0031] (1) While realizing the orientation of the guide support column, the fast opening and closing of the support lug assembly can be realized without the need to replace the separate support lug operation tool. This makes the device multi-functional, easy to operate, and improves the efficiency of on-site operations.

[0032] (2) The tool can be used with online monitoring equipment to monitor the position matching information of the guide support column lug assembly and the lug slot of the core detector guide structure. Based on the position matching information of the lug, it reacts to the guide support column and adjusts the orientation in time, avoiding the risk of the guide support column and the upper internal components being locked due to "blind operation". This greatly improves the safety of the guide support column when it is screwed into the upper internal components and the reliability of the correct opening of the lug assembly. Attached Figure Description

[0033] Figure 1 This diagram shows the structure of the adjustment tool for the core detector guide support column.

[0034] Figure 2 A perspective view showing the adjustment tool for the core detector guide support column;

[0035] Figure 3 This diagram shows the structure of the support assembly.

[0036] Figure 4 Improve the component structure diagram;

[0037] Figure 5 Schematic diagram of the lifting handle structure;

[0038] Figure 6 This is a schematic diagram of the gripper assembly.

[0039] Figure 7 This is a cross-sectional view of the gripper assembly.

[0040] Figure 8 This is a schematic diagram of the gripper's structure;

[0041] Figure 9 This is a diagram showing the claws opening.

[0042] Figure 10 This diagram illustrates the closing of the gripper.

[0043] Figure 11 This diagram shows the structure of the lug operating lever.

[0044] In the picture,

[0045] 1-Support assembly, 2-Lifting assembly, 3-Grip head assembly, 4-Support operating lever, 5-Outer cylinder, 6-Support sleeve, 7-End sleeve, 8-Fixed handle, 9-Core rod, 10-Push rod head, 11-Lifting handle, 12-Grip holder, 13-Grip, 14-Rotating shaft, 15-Baffle, 16-Handle housing, 17-Spring, 18-Insertion rod, 19-Lifting ring. Detailed Implementation

[0046] To further understand the present invention, embodiments of the present invention are described below in conjunction with examples. However, it should be understood that these descriptions are only for further illustrating the features and advantages of the present invention, and not for limiting the present invention.

[0047] The tool described in this invention is applicable to the online adjustment of the guide column and the opening and closing of the lugs of the Hualong One reactor core detector.

[0048] An embodiment of the present invention discloses a core detector guide support column adjustment tool, such as... Figure 1 and Figure 2 As shown, it includes: support assembly 1, lifting assembly 2, gripper assembly 3, and support lug operating lever 4;

[0049] like Figure 3 As shown, the support assembly 1 is used to install and fix the lifting assembly 2, the gripper assembly 4 and the support lug operating rod 4, specifically including the outer cylinder 5, the support sleeve 6, the end sleeve 7 and the fixing handle 8;

[0050] The outer cylinder is preferably made of Φ48×5 stainless steel pipe. The upper and lower parts of the steel pipe are welded with M45 external thread ends. The lower M6 set screw is installed from the outer wall to ensure that the outer cylinder will not loosen after being tightened. The set screw is spot welded to prevent loosening at the factory.

[0051] The support sleeve 6 is sleeved on the outside of the outer cylinder 5, and its top is connected to the end sleeve 7. A fixing handle 8 is welded on the side wall of the support sleeve 6.

[0052] The support sleeve 6 is preferably a stainless steel round tube with an outer diameter of Φ65 and an inner diameter of Φ40mm. It has an M45 internal thread at the bottom to mate with the outer cylinder. The Φ40mm inner diameter allows the Φ35mm diameter lifting assembly to move smoothly up and down. The fixed handle 8 is preferably a stainless steel rod with a knurled surface to increase hand grip friction.

[0053] Preferably, the fixed handle 8 is provided with a hanging ring 19;

[0054] The end sleeve 7 is also provided with two holes on its side wall, namely an upper hole and a lower hole, and a sliding groove is provided between the upper hole and the lower hole;

[0055] The distance between the upper hole and the lower hole is 60-80mm, with 70mm being the optimal value, corresponding to the two positions of the gripper opening and closing respectively.

[0056] The support lug operating rod 4 is inserted through the end sleeve 7 and passes through the inside of the core rod 9;

[0057] like Figure 4 As shown, the lifting assembly 2 includes a core rod 9, a push rod head 10, and a lifting handle 11;

[0058] The lower end of the core rod 9 is the push rod head 10;

[0059] The core rod 9 can be made of Φ21×2 stainless steel pipe. The core rod 9 has a hollow structure. The support lug operating rod 4 is inserted into the core rod 9 to adjust the opening and closing of the support lug.

[0060] One end of the lifting handle 11 passes through a hole in the side wall of the end sleeve 7 and connects to the upper end of the core rod 9; the lifting handle 11 moves up and down along the slide groove and is engaged in the upper or lower hole to achieve fixation;

[0061] The lifting handle 11 is machined from a Φ30 stainless steel bar with knurled surface to increase friction.

[0062] like Figure 5 As shown, the lifting handle 11 includes a handle housing 16, a spring 17, and a plug rod 18;

[0063] The handle housing 16 can be machined from a Φ30 stainless steel bar with knurled surface to increase friction.

[0064] The insertion rod 18 is connected to the core rod 9;

[0065] A spring 17 is provided inside the handle housing 16;

[0066] The insertion rod 18 passes through the spring 17 and one side wall of the handle housing 16;

[0067] After the handle housing 16 is pulled outward, the insertion rod 18 moves up and down along the slide groove; after the handle housing 16 is retracted, it is engaged in the hole on the side wall of the end sleeve 7, thereby fixing the position of the lifting component and keeping the adjusting tool in the open or retracted state of the claw.

[0068] The push rod head 10 is paired with the claw 13. Its material is 05Cr17Ni4Cu4Nb martensitic stainless steel, the same as the claw. This part is a key component. It works in conjunction with the claw to ensure smooth up and down movement with low resistance.

[0069] like Figure 6 and 7As shown, the gripper assembly 3 is used to grip the guide support column. In the retracted state, the gripper seat can be lowered to the interface. After reaching the interface, the gripper opens, allowing it to be inserted precisely into the corresponding hole in the interface, thus connecting the adjustment tool and the guide support column into a single unit. The inner diameter of the gripper seat is the same as that of the guide support column, ensuring the coaxiality of the adjustment tool and the guide support column.

[0070] Specifically, the gripper assembly 3 includes a gripper base 12 and a gripper 13;

[0071] The upper part of the gripper seat 12 is connected to the outer cylinder, and the lower part of the gripper seat 12 is equipped with a rotating shaft 14, with a gripper 13 installed on each rotating shaft 14.

[0072] Preferably, the lower part of the gripper base 12 is equipped with three rotating shafts 14, and a gripper 13 is installed on each rotating shaft 14. The gripper 13 is spaced at an angle of 120 degrees, and the width of the gripper 13 is the same as the width of the mounting position on the gripper base 12.

[0073] For example, the gripper width is 35mm, and the gripper mounting position on the gripper base is 35mm wide. The two fit together tightly to ensure that the gripper can open and close smoothly.

[0074] There is a baffle 15 at each end of the rotating shaft 14 to prevent the rotating shaft from coming off. The baffle 5 is fixed to the gripper seat 12 by screws.

[0075] like Figures 8-10 As shown, the bottom of the gripper 13 has an outward-facing hook.

[0076] The gripper seat 12 is a hollow structure. The core rod 9 passes through the gripper seat 12 and the outer cylinder 5. The push rod head 10 is located between the grippers 13. The push rod head 10 moves up and down to control the opening and closing of the grippers 13.

[0077] The gripper 13 rotates around the central Φ10mm pivot 14. The opening and closing of the gripper 13 is controlled by the push rod head 10. In both open and closed states, the gripper 13 and the push rod head 10 have a mating surface in contact. When the push rod head 10 moves downwards, the mating surface switches to the lower mating surface, causing the hook of the gripper 13 to rotate outwards at an angle of 8 degrees. After opening, the gripper 13 opens to a distance of 118mm, which is greater than the inner diameter Φ90mm of the guide support column, allowing it to hook onto the guide support column. When the push rod head 10 moves upwards, the mating surface switches to the upper mating surface, causing the gripper 13 to rotate in the opposite direction and retract inwards. After retraction, the distance of the gripper 13 is 80.8mm, which is less than the inner diameter Φ90mm of the guide support column, allowing the adjustment tool to be easily withdrawn.

[0078] like Figure 11As shown, the support lug operating lever 4 is used to control the opening and closing of the support lug. It is independent of other components and can be used independently to operate the support lug assembly, whether the adjustment tool is present or not, making it convenient for on-site operators to use.

[0079] When used in conjunction with other components, it is inserted from the middle of the core rod 9.

[0080] Both the upper and lower ends of the support arm operating rod 4 are hexagonal heads.

[0081] The lower hexagonal head is inserted into the adjustment hole of the lug top rod of the guide support column. Rotating the lug operating rod can drive the lug top rod of the guide support column to move up and down, ultimately controlling the opening and closing of the lug.

[0082] The support arm operating rod 11 is welded from Φ12×2 stainless steel pipes. The pipe specifications are Φ12*2, material is 05Cr17Ni4Cu4Nb, and the hexagonal head is also 05Cr17Ni4Cu4Nb. Its total length is 5256mm, the insertion depth of the adjustment tool is 5224mm, and the insertion depth from the adjustment tool is 4988mm, leaving a 32mm margin for convenient on-site operation. The inner diameter of the adjustment tool core rod is Φ17mm, with a 5mm gap between them to ensure smooth lowering of the support arm operating rod. The lower hexagonal head mates with the adjustment hole of the support arm top rod, and the upper hexagonal head mates with the torque wrench interface to control the torque of the support arm operating rod rotation.

[0083] Torque calculations were performed on the hexagonal head and the steel pipe separately, and the minimum value was taken as the maximum allowable torque of the support lug operating rod.

[0084] A. Calculation of Torsional Resistance of Steel Pipes

[0085] The tensile strength of 05Cr17Ni4Cu4Nb is ≥1070 MPa, so the maximum shear stress is 0.58 * tensile strength, which is 620.6 MPa. Using a safety factor of 2, the allowable shear stress is 310.3 MPa. T = Wp * τmax

[0086] Where: T = maximum torque, Wp = torsional section modulus, τmax = allowable shear stress.

[0087] Then the torsional section modulus of the steel pipe, Wp, is given by: Wp = πD³¹⁶(1 - (dD)) 4 ) = 2.72 × 10 -7 m 3

[0088] The maximum torsional moment of the steel pipe is T = 2.72 × 10⁻⁶. -7 ×310.3×10 6 =84.4Nm

[0089] The failure torque of the steel pipe, Tfailure = 2.72 × 10-1 -7 ×620.6×10 6 =168.8Nm

[0090] B. Hexagonal head torque calculation

[0091] The tensile strength of the hexagonal head material 05Cr17Ni4Cu4Nb is greater than 1070 MPa. Therefore, the maximum shear stress is 0.58 * tensile strength, which is 620.6 MPa. Using a safety factor of 2, the allowable shear stress is 310.3 MPa.

[0092] Consider a solid cylinder with a diameter of 10mm made by a hexagonal head. According to the formula T=Wp*τmax

[0093] Where: T = maximum torque, Wp = torsional section modulus, τmax = allowable shear stress

[0094] Therefore, the torsional section modulus of the hexagonal head is Wp = πd³16 = 1.96 × 10⁻⁶ -7 m 3

[0095] The maximum torsional moment of the hexagonal head is T = 1.96 × 10⁻⁶. -7 ×310.3×10 6 =60.8Nm

[0096] The breaking torque of the hexagonal head, T_breaking, is 1.96 × 10⁻⁶. -7 ×620.6×10 6 =121.6 Nm

[0097] In summary: the lug operating lever can be used normally under a maximum torque of 60.8 Nm with a safety factor of 2. When the torque exceeds 121.6 Nm, the lug operating lever will undergo plastic deformation, providing a theoretical basis for the maximum torque for opening and closing the lug.

[0098] The gripper 13, push rod head 10, and rotating shaft 14 are made of 05Cr17Ni4Cu4Nb martensitic stainless steel and their strength is increased through heat treatment.

[0099] This invention controls the opening and closing of the gripper by manually controlling the lifting assembly, thereby controlling the tool to grip the guide support column. The core rod has a hollow structure and can be inserted with the support lug operating rod for adjusting the opening and closing of the lug. The integrated tool is made of 06Cr19Ni10 stainless steel, weighs approximately 53kg, has an overall gripping length of 4287mm, and a length of 5356mm after assembling the support lug operating rod.

[0100] The tool needs to be lifted to the corresponding guide support column by the auxiliary crane of the loading and unloading machine, then slowly lowered until it reaches the guide support column. Finally, the gripper is used to grab the tool, connecting it to the guide support column. The tool is then rotated to adjust the orientation of the guide support column. Once the orientation is adjusted to the support lug assembly, the lug operating lever can be immediately operated to open and close the lug assembly. The operator only needs to stand on the loading and unloading machine to operate remotely. By standing on the loading and unloading machine, the operator can remotely grab, rotate, and open / close the tool, achieving integrated online adjustment of the guide support column and lug opening / closing functions.

[0101] The above description of the embodiments is only for the purpose of helping to understand the method and core ideas of the present invention. It should be noted that those skilled in the art can make several improvements and modifications to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

[0102] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those 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 invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A core detector guide support column adjustment tool, characterized by, The utility model relates to a kind of lifting device, including: Grab head assembly, support assembly, lifting assembly, lug operating rod; The support assembly includes outer cylinder, support sleeve, end sleeve and fixed handle; The support sleeve is sleeved on the outside of outer cylinder, and its top is connected with end sleeve, and fixed handle is welded on the side wall of the support sleeve; Two holes are further provided on the side wall of the end sleeve, and a sliding groove is provided between the two holes; The lifting assembly includes core rod, push rod head and lifting handle; The lower end of the core rod is push rod head; One end of the lifting handle is connected with the upper end of the core rod by passing through the hole on the side wall of the end sleeve, and the lifting handle moves up and down along the sliding groove and is clamped in the upper hole or the lower hole to realize fixation; The core rod is hollow structure, and lug operating rod is inserted into the core rod to adjust the opening and closing of lug; The grab head assembly includes claw seat and claw; The upper part of the claw seat is connected with the outer cylinder, and the lower part of the claw seat is installed with rotating shaft, and one claw is installed on each rotating shaft; The claw seat is hollow structure, and the core rod passes through the claw seat and the outer cylinder, and the push rod head is located between the claws, and the push rod head moves up and down to control the opening and closing of the claws; The lug operating rod is inserted by the end sleeve and passes through the inside of the core rod; The lifting handle includes handle shell, spring and plug rod; The plug rod is connected with the core rod; The spring is arranged in the handle shell; The plug rod passes through the spring and one side wall of the handle shell; After the handle shell is pulled outwards, the plug rod moves up and down along the sliding groove, and the handle shell is clamped in the hole on the side wall of the support sleeve to realize the position fixation of the core rod after being folded; The upper end and the lower end of the lug operating rod are both hexagonal head.

2. The core-rod guide support column adjustment tool of claim 1, wherein, Three rotating shafts are installed on the lower part of the claw seat, one claw is installed on each rotating shaft, the interval angle between each claw is 120 degrees, and the width of the claw is consistent with the width of the installation position on the claw seat. There is a baffle on each end of the rotating shaft, and the baffle is fixed on the claw seat.

3. The core-rod guide support column adjustment tool of claim 1, wherein, The fixed handle is provided with a lifting ring.

4. The core-rod guide support column adjustment tool of claim 1, wherein, The distance between the two holes on the side wall of the support sleeve is 60-80mm.

5. The core-rod guide support column adjustment tool of claim 1, wherein, The bottom of the claw is outward hook head.

6. The core-rod guide support column adjustment tool of claim 1, wherein, The inner diameter of the claw seat and the guide support column is consistent.

7. The core-rod guide support column adjustment tool of claim 1, wherein, The claw, the push rod head and the rotating shaft are made of 05Cr17Ni4Cu4Nb martensitic stainless steel, and the strength is increased by heat treatment.

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