CN217877400U

CN217877400U - Auxiliary accurate positioning tool for reactor core of loading and unloading system

Info

Publication number: CN217877400U
Application number: CN202220816601.XU
Authority: CN
Inventors: 陆斌; 王永鹏; 吴金标; 施卫华; 陆炜伟; 李昕; 陈晶
Original assignee: Cnnp Zhangzhou Energy Co ltd
Current assignee: Cnnp Zhangzhou Energy Co ltd
Priority date: 2022-04-11
Filing date: 2022-04-11
Publication date: 2022-11-22
Anticipated expiration: 2032-04-11

Abstract

The utility model belongs to the mechanical maintenance field specifically discloses a loading and unloading system reactor core auxiliary precise positioning instrument, include: the device comprises a measuring rod, a bottom plate and a measuring plate; the bottom plate is of a plate-shaped structure, and bosses are arranged on the bottom plate along diagonal lines; the measuring plate is of a plate-shaped structure, the measuring plate is vertically arranged on the bottom plate, and one side edge of the measuring plate props against the side edge of the boss on the bottom plate; the measuring rod is vertically installed in the side wall of the measuring plate. The utility model discloses a positioning tool simple structure, convenient operation can effectively improve the positioning accuracy degree, can obtain accurate reactor core coordinate through this positioning tool.

Description

Auxiliary accurate positioning tool for reactor core of loading and unloading system

Technical Field

The utility model belongs to the mechanical maintenance field, concretely relates to loading and unloading system reactor core auxiliary precise positioning instrument.

Background

The loading and unloading system is a key important system of a nuclear power plant and is used for loading and unloading nuclear fuel assemblies from a reactor core during the refueling overhaul of the nuclear power plant. During commissioning of a nuclear power plant, the handler needs to perform core positioning tests to obtain 177 sets of fuel assembly coordinates. In the process of performing a reactor core positioning test, when a loading and unloading machine carries a simulation fuel assembly to be placed in a reactor core, a worker needs to measure the relative position deviation of the central axis horizontal direction of a fuel assembly positioning hole before the fuel assembly positioning hole enters a grid plate positioning pin under the reactor core so as to judge whether the fuel assembly is accurately inserted into the reactor core. This process is related to the accuracy of the core coordinate establishment. However, there is no tool specially used for measuring the position deviation, and the measurement precision is difficult to control only by the judgment of a worker by hand and feeling, so that the measurement deviation caused by judgment of the worker exists.

Therefore, it is necessary to develop a precise positioning tool for core debugging of the loading and unloading system to solve the problems of the current measurement method.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a loading and unloading system reactor core auxiliary precise positioning instrument, this positioning instrument simple structure, convenient operation can effectively improve the positioning accuracy degree, can obtain accurate reactor core coordinate through this positioning instrument.

Realize the utility model discloses the technical scheme of purpose:

a handling system core assisted precision positioning tool comprising: the device comprises a measuring rod, a bottom plate and a measuring plate; the bottom plate is of a plate-shaped structure, and bosses are arranged on the bottom plate along diagonal lines; the measuring plate is of a plate-shaped structure, the measuring plate is vertically arranged on the bottom plate, and one side edge of the measuring plate props against the side edge of the boss on the bottom plate; the measuring rod is vertically installed in the side wall of the measuring plate.

The two ends of the lug boss of the bottom plate are symmetrically provided with positioning holes penetrating through the lug boss, and the positioning holes are matched with positioning pins of a grid plate under the reactor core of the reactor core internal member at the lower part of the reactor core.

And a through hole penetrating through the boss is formed in the middle of the boss of the bottom plate, and the size of the through hole is adapted to that of a fastening bolt at the bottom of the reactor core lower-part reactor internals.

The side wall of the measuring plate is provided with a measuring hole penetrating through the side wall, the measuring rod is inserted into the measuring hole and is installed in the side wall of the measuring plate in an interference fit mode, and one end of the measuring rod is in contact with the outer wall of the simulated fuel assembly.

Two measuring plates are vertically arranged on the bottom plate, and the two measuring plates are perpendicular to each other and are in opposite positions.

Two ends of the measuring plate are symmetrically provided with measuring holes, and each measuring hole is fixedly provided with a measuring rod.

The measuring rod comprises a measuring rod, a sleeve, a knob and an installation matching surface, the measuring rod and the installation matching surface are fixedly connected slender shafts, one end, close to the installation matching surface, of the measuring rod is sleeved with the sleeve, and the other end of the sleeve is fixedly connected with one end of the knob.

The movable part of the measuring rod is processed into a screw with the screw pitch of 0.5 mm.

The thread insert of the sleeve is uniformly provided with 50 grids along the circumference.

The utility model has the beneficial technical effects that:

1. the utility model provides a pair of loading and unloading system reactor core assists accurate positioning tool simple structure, reasonable in design, convenient operation measures the positioning accuracy of simulation fuel assembly when being convenient for loading and unloading machine reactor core location test to this obtains more accurate reactor core coordinate, thereby nuclear fuel assembly scraping's when reducing the loading and unloading material possibility, guarantees nuclear power plant's the security of fuel assembly during the loading and unloading material.

2. The utility model provides a pair of loading and unloading system reactor core assistance-localization real-time instrument for touch the method of roughly confirming whether the simulation fuel assembly location is accurate by the sensation for relying on the hand at present, can the quantitative measure to simulate fuel's torsion volume and position degree, and the precision can be followed present 2mm, improves to 0.3mm.

3. The utility model provides a pair of loading and unloading system reactor core assistance-localization real-time instrument, direct mount can direct measurement fuel assembly's torsion volume and position degree on the locating pin on the grid plate under the reactor core, lie prone for present personnel and observe and the measuring method can improve work efficiency on the grid plate down, improve the simple operation nature, and measuring time is original 1/3.

Drawings

Fig. 1 is a schematic structural view of an auxiliary precise positioning tool for a reactor core of a loading and unloading system provided by the present invention;

fig. 2 is a schematic structural view of a measuring rod in an auxiliary precise positioning tool for a reactor core of a loading and unloading system provided by the present invention;

fig. 3 is a schematic view of the working state of the auxiliary precise positioning tool for the reactor core of the loading and unloading system provided by the present invention.

In the figure: 1-measuring the hole; 2-measuring rod; 3-a bottom plate; 4-through holes; 5-positioning the hole; 6-measuring the plate; 7-simulating a fuel assembly lower nozzle; 21-measuring rod; 22-a sleeve; 23-a knob; 24-mounting a mating surface.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples.

As shown in FIG. 1, the utility model provides a pair of loading and unloading system reactor core assists accurate positioning tool, include: the device comprises a measuring rod 2, a bottom plate 3 and a measuring plate 6, wherein the bottom plate 3 is of a plate-shaped structure, and a boss is arranged at the diagonal position of the bottom plate 3. When the positioning tool of the utility model is used for measuring and positioning, the bottom plate 3 is arranged above a lower grid plate of a reactor core lower part reactor internals and is used for contacting with the lower grid plate of the reactor core lower part reactor core internals; the measuring plate 6 is of a plate-shaped structure, the measuring plate 6 is vertically arranged on the bottom plate 3, and one side edge of the measuring plate 6 props against the side edge of the boss on the bottom plate 3 and is used for fixedly arranging the measuring plate 6 on the bottom plate 3; the measuring rod 2 is mounted vertically in the side wall of the measuring plate 6.

As shown in fig. 1, the boss both ends symmetry of bottom plate 3 is opened has the locating hole 5 that link up the boss, and locating hole 5 cooperates with the locating pin of grid plate under the reactor core lower part internals reactor core, will the utility model discloses a positioning tool fixed mounting is in reactor core lower part internals grid plate top under. The boss intermediate position of bottom plate 3 is opened has the through-hole 4 that link up the boss, and the size of through-hole 4 suits with the fastening bolt's of reactor core lower part internals bottom size, is used for the utility model discloses a positioning tool fixed mounting holds the fastening bolt of reactor core lower part internals bottom when grid plate top under the reactor core lower part internals.

As shown in fig. 1, a measurement hole 1 penetrating through the side wall is formed in the side wall of the measurement plate 6, the measurement rod 2 is inserted into the measurement hole 1, an attachment fitting surface 24 of the measurement rod 2 is attached to the side wall of the measurement plate 6 by interference fit, and one end of the measurement rod 2 is in contact with the outer wall of the simulated fuel assembly and is pressed against the outer wall of the simulated fuel assembly to perform positioning and measurement of the loading and unloading system core.

In some embodiments, two measurement plates 6 are vertically installed on the bottom plate 3, and the two measurement plates 6 are in a mutually vertical relative position, as shown in fig. 1.

In some embodiments, the measuring plate 6 has measuring holes 1 symmetrically formed at both ends, and a measuring rod 2 is fixedly installed in each measuring hole 1, as shown in fig. 1.

As shown in fig. 2, the measuring rod 2 includes a measuring rod 21, a sleeve 22, a knob 23 and a mounting fitting surface 24, the measuring rod 21 and the mounting fitting surface 24 are slender shafts fixedly connected, the sleeve 22 is sleeved on one end of the measuring rod 21 close to the mounting fitting surface 24, the other end of the sleeve 22 is fixedly connected with one end of the knob 23, a movable portion of the measuring rod 21 is processed into a screw rod with a screw pitch of 0.5mm, when the screw rod rotates in a screw sleeve of the sleeve 22 for one circle, the screw rod advances or retreats by 0.5mm, and the screw sleeve is uniformly provided with 50 cells along the circumference. The portion greater than 0.5mm is read directly from the main scale on the lateral bar 21 and the portion less than 0.5mm is measured by the score lines around the periphery of the movable sleeve 22. The knob 23 is screwed to drive the side rod 21 to move left and right relative to the sleeve 22, when the pressure of the measuring rod 21 connected with a measured object reaches a set value, the ratchet wheel of the knob 23 slides and has a rattling sound, the movable sleeve 22 does not rotate any more, the measuring rod 21 also stops advancing, and at the moment, a measured value can be read.

Adopt the utility model provides a pair of loading and unloading system reactor core auxiliary precise positioning instrument carries out the location measurement work of loading and unloading system reactor core, specifically includes following step:

step (1), will the utility model discloses an auxiliary accurate positioning tool installs the position that certain fuel assembly on the grid plate corresponds under the reactor core of lower part internals, through two locating holes 5 of positioning tool and two locating pin location of grid plate down. The theoretical coordinate of the fuel assembly corresponding to the position is (X, Y), X is the horizontal coordinate of a cart track of the loading and unloading machine, Y is the horizontal coordinate of a trolley track of the loading and unloading machine, the coordinate precision is 0.1mm, and the coordinate parameter is stored in the PLC;

step (2), operating the material loading and unloading machine, and moving the material loading and unloading machine with the simulated fuel assembly to the position above the theoretical coordinates (X, Y) of the fuel assembly;

step (3) operating the loading and unloading machine to simulate the fuel assembly through the telescopic sleeve

Inserting the fuel assembly into a reactor core, stopping when the fuel assembly is about 50mm away from a grid plate under the reactor core, recording the telescopic length of a telescopic sleeve of a loading and unloading machine as a Z coordinate, wherein the Z coordinate is a vertical coordinate with the precision of 0.1mm, storing coordinate parameters in a PLC, and then simulating the fuel assembly to enter the measurement range of a positioning tool;

step (4), operating 4 measuring rods 2 on two measuring plates 6 which are arranged vertically with each other by a worker, and touching one end of a side rod 21 on all the measuring rods 2 to a simulated fuel assembly lower tube seat 7;

and (5) respectively reading the readings of the four measuring rods 2, so that the actual coordinate position torsion and the position degree of the simulated fuel assembly can be determined: the difference value of the readings measured by the two measuring rods 2 on the same measuring plate 6 is the torsion of the simulated fuel assembly; the difference value between the average value of the readings measured by the two measuring rods 2 on the same measuring plate 6 and the average value of the readings measured by the two measuring rods 2 on the other measuring plate 6 perpendicular to the measuring plate is the position degree deviation of the simulated fuel assembly;

step (6), if the actual coordinate position torsion amount of the fuel assembly is larger than 1mm and the position deviation value is larger than 1mm, determining that the positioning accuracy of the fuel assembly is out of tolerance, adjusting a horizontal coordinate X of a cart track of a loading and unloading machine in a PLC, and re-measuring a horizontal coordinate Y of a trolley track of the loading and unloading machine and a rotating sleeve Z until the actual coordinate position torsion amount is smaller than 1mm and the position deviation value is smaller than 1mm;

the present invention has been described in detail with reference to the drawings and examples, but the present invention is not limited to the above examples, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art. The present invention can adopt the prior art for the content which is not described in detail in the present invention.

Claims

1. A handling system core assisted precision positioning tool, the positioning tool comprising: the device comprises a measuring rod (2), a bottom plate (3) and a measuring plate (6); the bottom plate (3) is of a plate-shaped structure, and bosses are arranged on the bottom plate (3) along diagonal positions; the measuring plate (6) is of a plate-shaped structure, the measuring plate (6) is vertically arranged on the bottom plate (3), and one side edge of the measuring plate (6) props against the side edge of the boss on the bottom plate (3); the measuring rod (2) is vertically arranged in the side wall of the measuring plate (6).

2. The auxiliary precise positioning tool for the reactor core of the loading and unloading system as claimed in claim 1, wherein the bottom plate (3) is symmetrically provided with positioning holes (5) at two ends of the boss, and the positioning holes (5) are matched with the positioning pins of the lower grid plate of the reactor core lower reactor component.

3. The auxiliary precise positioning tool for the core of the handling system according to claim 1, wherein the bottom plate (3) is provided with a through hole (4) at the middle position of the boss, and the size of the through hole (4) is adapted to the size of the fastening bolt at the bottom of the reactor core lower internals.

4. The core auxiliary precise positioning tool of the loading and unloading system as recited in claim 1, wherein the side wall of the measuring plate (6) is provided with a measuring hole (1) penetrating through the side wall, the measuring rod (2) is inserted into the measuring hole (1), the measuring rod (2) is installed in the side wall of the measuring plate (6) through interference fit, and one end of the measuring rod (2) is in contact with the outer wall of the simulated fuel assembly.

5. The auxiliary precise positioning tool for the core of the loading and unloading system as recited in claim 1, wherein two measuring plates (6) are vertically mounted on the bottom plate (3), and the two measuring plates (6) are in mutually perpendicular relative positions.

6. The auxiliary precise positioning tool for the core of the loading and unloading system according to claim 1, wherein the measuring holes (1) are symmetrically formed at two ends of the measuring plate (6), and a measuring rod (2) is fixedly installed in each measuring hole (1).

7. The reactor core auxiliary accurate positioning tool of the loading and unloading system as recited in claim 1, wherein the measuring rod (2) comprises a measuring rod (21), a sleeve (22), a knob (23) and an installation matching surface (24), the measuring rod (21) and the installation matching surface (24) are fixedly connected slender shafts, the sleeve (22) is sleeved at one end of the measuring rod (21) close to the installation matching surface (24), and the other end of the sleeve (22) is fixedly connected with one end of the knob (23).

8. The auxiliary precise positioning tool for the core of the handling system according to claim 7, characterized in that the movable part of the measuring rod (21) is machined into a screw with a thread pitch of 0.5 mm.

9. The auxiliary precise positioning tool for the core of the loading and unloading system as recited in claim 7, wherein the threaded sleeve of the sleeve (22) is uniformly provided with 50 cells along the circumference.