Portable finger sleeve plugging and unplugging device for nuclear power station and plugging and unplugging method

Abstract

The invention relates to the field of nuclear instruments, in particular to a portable finger sleeve plugging device for a nuclear power station and a plugging method. The device comprises an upper pressing block and a lower pressing block which are arranged in parallel and are connected through a pressure bolt; guide clamping grooves are formed in the front ends and the rear ends of the upper pressing block and the lower pressing block; the driving mechanism comprises two sets of belt transmission units in mirror symmetry, and the two sets of belt transmission units are integrated in the upper pressing block and the lower pressing block correspondingly. Each belt transmission unit comprises a driving shaft vertically penetrating through the corresponding pressing block, the top end of the driving shaft extends to the outside of the pressing block, and the top end of the driving shaft is sleeved with a driving gear; the driven shaft is parallel to the driving shaft; the closed-loop driving belt is tensioned between the driving shaft and the driven shaft; the driving belt working surfaces of the two groups of belt transmission units are oppositely arranged; the clamping mechanism comprises a fixing rod, one end of the fixing rod is fixedly connected with the front end of the upper pressing block, and the other end of the fixing rod is connected with a clamping claw. According to the device, the reactor core finger sleeve can be quickly and conveniently pulled out and inserted.

Description

Technical Field

[0001] The present invention relates to the field of nuclear instruments, and particularly to a portable finger sleeve plugging and unplugging device and a plugging and unplugging method for a nuclear power plant. Background Art

[0002] The core measurement system of a nuclear power plant uses 5 movable miniature fission chambers to measure the core neutron flux. Each movable miniature fission chamber enters the core through a finger sleeve for core neutron flux measurement. The finger sleeve is a stainless steel pipe with an outer diameter of 8.6 mm, an inner diameter of 5.2 mm, and a length ranging from 13.6 m to 17.3 m, and is inserted into the guide hole of the core fuel assembly through a sealing assembly. To avoid affecting the refueling process, 50 finger sleeves need to be pulled out before each refueling, and 50 finger sleeves need to be pushed back into place after refueling.

[0003] The finger sleeve is inserted into the reactor pressure vessel from the bottom of the core through a sealing assembly. An "O" - ring and packing are used for sealing between the sealing assembly and the outer wall of the finger sleeve, and at the same time, the "O" - ring and packing are compressed by an inner plug and a nut to ensure that the primary coolant does not leak under various working conditions. Among them, the "O" - ring has a strong compression resistance, making it relatively laborious to plug and unplug the finger sleeve. During the plugging and unplugging process of the finger sleeve, 5 - 6 people need to operate simultaneously. After plugging and unplugging a dozen or so, personnel are rotated, and 4 groups of people are required to complete the plugging and unplugging of all 50 finger sleeves. During the pushing - back process, due to the limitation of the force exerted by personnel, the finger sleeve is prone to bending. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a portable finger sleeve plugging and unplugging device and a plugging and unplugging method for a nuclear power plant, which can realize the rapid and convenient pulling out and insertion of the core finger sleeve.

[0005] The present invention provides a portable finger sleeve plugging and unplugging device for a nuclear power plant, including: an upper pressing block, a lower pressing block, a driving mechanism, and a clamping mechanism;

[0006] The upper pressing block and the lower pressing block are arranged in parallel, and the two form a clamping matrix with an adjustable distance through a pressure bolt;

[0007] Guide card slots are arranged at the front end and the rear end of the upper pressing block and the lower pressing block for guiding the finger sleeve;

[0008] The driving mechanism includes:

[0009] Two groups of mirror - symmetric belt drive units, which are respectively integrated inside the upper pressing block and the lower pressing block;

[0010] Each belt drive unit includes:

[0011] A driving shaft vertically penetrating the corresponding pressing block, the top end of the driving shaft extends outside the pressing block, and a driving gear is sleeved on the top end of the driving shaft;

[0012] A driven shaft arranged parallel to the driving shaft;

[0013] A closed-loop driving belt tensioned between the driving shaft and the driven shaft;

[0014] Wherein the working surfaces of the driving belts of the two sets of belt transmission units are arranged oppositely to form a driving working surface for the finger sleeve;

[0015] The clamping mechanism includes:

[0016] A fixed rod, one end of which is fixedly connected to the front end of the upper pressing block, and the other end is connected to the clamping claw.

[0017] In a specific embodiment of the present invention, a force-reducing spring is arranged between the upper pressing block and the lower pressing block, and the compression direction of the force-reducing spring is consistent with the axial direction of the pressure bolt.

[0018] In a specific embodiment of the present invention, the upper pressing block and the lower pressing block are also fixed by a plurality of positioning pins, and the positioning pins penetrate through the upper pressing block, the lower pressing block and the force-reducing spring between the upper and lower pressing blocks.

[0019] In a specific embodiment of the present invention, the clamping claw is composed of an upper clamping claw and a lower clamping claw hinged at one end, and the movable ends of the upper clamping claw and the lower clamping claw are clamped and fixed by a bolt hinged on the lower clamping claw.

[0020] In a specific embodiment of the present invention, the lower clamping claw is provided with a hollow structure to achieve the purpose of clamping without disassembling the leak detector of the sealing assembly.

[0021] In a specific embodiment of the present invention, a handle is arranged on the side surface of the lower pressing block.

[0022] In a specific embodiment of the present invention, a protective cover is installed outside the driving gear.

[0023] In a specific embodiment of the present invention, the end of the driving gear has a hexagonal socket-shaped groove or hole.

[0024] The present invention provides a finger sleeve plugging method implemented by using a portable finger sleeve plugging device for a nuclear power plant, including the following steps:

[0025] Install the clamping claw between the upper and lower nuts of the sealing assembly;

[0026] Put the finger sleeve into the driving and guiding channels of the upper and lower pressing blocks, rotate the pressure bolt to fasten the upper and lower pressing blocks, and fasten the finger sleeve in the driving and guiding channels;

[0027] Rotate the driving gear to drive the driving shaft, the driven shaft and the driving belt to move;

[0028] The driving belt clamps the finger sleeve to move and complete the plugging and unplugging work.

[0029] Compared with the prior art, the portable finger sleeve plugging and unplugging device for nuclear power plants of the present invention has the following beneficial effects:

[0030] (1) A driving gear is provided, which is convenient for driving the finger sleeve by an electric tool. Forward and reverse rotations correspond to insertion and extraction respectively, with adjustable speed, torque protection, and not affected by the power supply; at the same time, it solves the current situation that a large amount of manpower is required for the plugging and unplugging of finger sleeves.

[0031] (2) A brand-new clamping design, the clamping claws fit the sealing component, but there is no need to remove the leakage detector, reducing the weight of the clamping parts and improving the stability and collimation.

[0032] (3) Belt friction drive reduces the weight of the device and the damage to the surface of the finger sleeve.

[0033] (4) The overall mass is less than 2 kg, which is convenient and easy to carry, solving the inconvenience of handling and installation of similar products.

[0034] (5) A force-reducing spring is designed at the pressing position to fully protect the finger sleeve and prevent the finger sleeve from being deformed due to excessive pressing force.

[0035] Generally speaking, the present invention can be installed between two sealing nuts of the sealing component of the core measurement system, and an electric wrench can act on the drive shaft to realize convenient and fast plugging and unplugging of the finger sleeve, solving the current situation that multiple groups of manpower are required to take turns for the plugging and unplugging of the finger sleeve. Description of the Drawings

[0036] Figure 1 It shows the structural diagram of the portable automatic plugging and unplugging device for finger sleeves in nuclear power plants;

[0037] Figure 2 It shows the top view of the portable automatic plugging and unplugging device for finger sleeves in nuclear power plants;

[0038] Figure 3 It shows the left view of the portable automatic plugging and unplugging device for finger sleeves in nuclear power plants;

[0039] Figure 4 It shows the front view of the portable automatic plugging and unplugging device for finger sleeves in nuclear power plants;

[0040] In the figure, 1 - upper pressing block, 2 - lower pressing block, 3 - grip, 4 - protective cover, 5 - drive shaft, 6 - pressure bolt, 7 - drive belt, 8 - drive gear, 9 - guiding slot, 10 - positioning pin, 11 - clamping claw, 12 - driven shaft, 13 - fixing rod, 14 - force-reducing spring. Detailed Embodiment

[0041] To further understand the present invention, the embodiments of the present invention will be described below in conjunction with the embodiments. However, it should be understood that these descriptions are only for further explaining the features and advantages of the present invention, rather than limiting the present invention.

[0042] An embodiment of the present invention discloses a portable finger sleeve plugging and unplugging device for a nuclear power plant, including:

[0043] An upper pressing block 1, a lower pressing block 2, a driving mechanism and a clamping mechanism;

[0044] The upper pressing block 1 and the lower pressing block 2 are arranged in parallel. The two form a clamping matrix with adjustable spacing through a pressure bolt 6, and achieve adjustable and firm connection through the pressure bolt 6; several positioning pins 10 are also used to fix between the upper pressing block 1 and the lower pressing block 2. The positioning pins 10 penetrate through the upper pressing block 1, the lower pressing block 2, and the force-reducing spring 14 between the upper and lower pressing blocks.

[0045] A finger sleeve guiding channel is formed between the two;

[0046] A guiding card slot 9 is arranged at the rear end of the upper pressing block 1 and the lower pressing block 2 for guiding the finger sleeve.

[0047] A grip 3 is arranged on the side surface of the lower pressing block.

[0048] The driving mechanism includes:

[0049] Two groups of mirror-symmetrical belt transmission units, which are respectively integrated inside the upper pressing block 1 and the lower pressing block 2; each belt transmission unit includes:

[0050] A driving shaft 5 vertically penetrating the corresponding pressing block. The top end of the driving shaft 5 extends outside the pressing block, and a driving gear 8 is sleeved on the top end of the driving shaft. A protective cover 4 is installed outside the driving gear 8. When in use, an electric wrench is used to rotate the driving gear 8, thereby driving the driving shaft 5.

[0051] A driven shaft 12 arranged parallel to the driving shaft 5;

[0052] A closed-loop driving belt 7 tensioned between the driving shaft 5 and the driven shaft 12;

[0053] Among them, the working surfaces of the driving belts 7 of the two groups of belt transmission units are arranged opposite to each other to form a finger sleeve driving working surface;

[0054] Specifically:

[0055] The driving shaft 5 includes an upper driving shaft and a lower driving shaft;

[0056] The driven shaft 12 includes an upper driven shaft and a lower driven shaft;

[0057] The upper drive shaft passes through the upper pressing block 1 from top to bottom. A drive gear 8 is sleeved on the upper end of the upper drive shaft, and the drive gear 8 is located on the upper surface of the upper pressing block 1.

[0058] The upper drive shaft passes through the upper pressing block 1 from top to bottom,

[0059] A drive belt 7 is arranged between the upper drive shaft and the upper driven shaft,

[0060] The rotation of the upper drive shaft drives the movement of the drive belt 7;

[0061] The lower drive shaft passes through the lower pressing block 2 from top to bottom. The lower drive shaft passes through the lower pressing block 2 from top to bottom,

[0062] A drive belt 7 is arranged between the lower drive shaft and the lower driven shaft,

[0063] The rotation of the lower drive shaft drives the movement of the drive belt 7;

[0064] The clamping mechanism includes:

[0065] A fixed rod 13, one end of which is fixedly connected to the front end of the upper pressing block 1, and the other end is connected to a clamping jaw 11; The clamping jaw 11 is composed of an upper clamping jaw and a lower clamping jaw that cooperate with each other,

[0066] One end of the upper clamping jaw and the lower clamping jaw is hinged, and the other end is fastened and disassembled through a bolt hinged on the lower clamping jaw.

[0067] The upper clamping jaw and the lower clamping jaw are provided with arc-shaped clamping surfaces that match the fixed contour of the sealing component. The lower clamping jaw is provided with a hollow structure to achieve the purpose of clamping without disassembling the leakage detector of the sealing component.

[0068] An embodiment of the present invention also discloses a finger sleeve plugging and unplugging method implemented by using the portable finger sleeve automatic plugging and unplugging device for nuclear power plants described in the present invention, which specifically includes the following steps:

[0069] Install the clamping jaw 11 between the upper and lower nuts of the sealing component;

[0070] One end of the finger sleeve is inserted into the guiding slot 9, and the pressure bolt 6 is rotated to fasten the upper pressing block 1 and the lower pressing block 2, and the finger sleeve is fastened in the guiding slot 9;

[0071] Rotate the drive gear 8 to drive the movement of the drive shaft 5, the driven shaft 12 and the drive belt 7;

[0072] The drive belt 7 clamps the finger sleeve to move to complete the plugging and unplugging work.

[0073] The present invention has verified this tool during the plugging and unplugging process of the finger sleeve of Unit 5 of Tianwan Nuclear Power Plant. It can be operated by a single person, and the finger sleeve of the reactor core can be plugged and unplugged quickly and smoothly, greatly improving the convenience and reliability of the plugging and unplugging work.

[0074] After using this tool, the process of inserting and removing finger sleeves, which originally required more than twenty people, can be completed by the cooperation of two people. Compared with the previous manual insertion and removal method, the pushing-back process is more continuous, reducing the possibility of the finger sleeves being bent, and is more labor-saving, time-saving, safe and reliable.

[0075] The description of the above embodiments is only used to help understand the method and its core idea of the present invention. It should be noted that for those of ordinary skill in the art of this technology, without departing from the principle of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

[0076] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to these embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A portable finger sleeve plugging and unplugging device for a nuclear power plant, characterized in that, Comprising: An upper pressing block, a lower pressing block, a driving mechanism and a clamping mechanism; The upper pressing block and the lower pressing block which are arranged in parallel with each other, and the two form a clamping matrix with adjustable distance through a pressure bolt; Guide card slots are arranged at the front end and the rear end of the upper pressing block and the lower pressing block for guiding finger sleeves; The driving mechanism includes: Two groups of mirror-symmetrical belt transmission units, which are respectively integrated inside the upper pressing block and the lower pressing block; Each belt transmission unit includes: A driving shaft vertically penetrating the corresponding pressing block, the top end of the driving shaft extends outside the pressing block, and a driving gear is sleeved on the top end of the driving shaft; A driven shaft arranged parallel to the driving shaft; A closed-loop driving belt tensioned between the driving shaft and the driven shaft; Wherein the working surfaces of the driving belts of the two groups of belt transmission units are arranged oppositely to form a finger sleeve driving working surface; The clamping mechanism includes: A fixing rod, one end of which is fixedly connected to the front end of the upper pressing block, and the other end is connected to a clamping claw.

2. The portable finger sleeve plugging and unplugging device for nuclear power plants according to claim 1, wherein A damping spring is arranged between the upper pressing block and the lower pressing block, and the compression direction of the damping spring is the same as the axial direction of the pressure bolt.

3. The portable finger sleeve plugging device for nuclear power plants according to claim 1, wherein The upper pressing block and the lower pressing block are also fixed by a plurality of positioning pins, and the positioning pins penetrate through the upper pressing block, the lower pressing block and the damping spring between the upper and lower pressing blocks.

4. The portable finger sleeve plugging and unplugging device for nuclear power plants according to claim 1, wherein, The clamping claw is composed of an upper clamping claw and a lower clamping claw hinged at one end, and the movable ends of the upper clamping claw and the lower clamping claw are clamped and fixed by a bolt hinged on the lower clamping claw.

5. The portable finger sleeve plugging and unplugging device for nuclear power plants according to claim 4, wherein The lower clamping claw is provided with a hollow structure to achieve the purpose of clamping without disassembling the leakage detector of the sealing component.

6. The portable finger sleeve plugging and unplugging device for nuclear power plants according to claim 1, wherein, A handle is arranged on the side surface of the lower pressing block.

7. The portable finger sleeve plugging device for nuclear power plants according to claim 1, characterized in that, A protective cover is installed outside the driving gear.

8. The portable finger sleeve plugging and unplugging device for nuclear power plants according to claim 1, characterized in that, The end of the driving gear has an internal hexagonal groove or hole.

9. A finger sleeve plugging and unplugging method implemented by using the portable finger sleeve plugging and unplugging device for nuclear power plants according to any one of claims 1 to 8, characterized in that, Including the following steps: Install the clamping claw between the upper and lower nuts of the sealing component; Put the finger sleeve into the driving and guiding channels of the upper and lower pressing blocks, rotate the pressure bolt to fasten the upper pressing block and the lower pressing block, and fasten the finger sleeve in the driving and guiding channels; Rotate the driving gear to drive the driving shaft, the driven shaft and the driving belt to move; The driving belt clamps the finger sleeve to move to complete the plugging and unplugging work.

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