A rack for measuring the coefficient of friction on the surface of a nuclear fuel rod

Abstract

The utility model discloses a kind of nuclear fuel rod surface friction coefficient measurement with lattice, it is related to lattice technical field, including screw rod elevator, linear guide and coating tube, the top of screw rod elevator is equipped with linear guide, and positioning plate is installed on the central axis of linear guide, the top of positioning plate is equipped with multiple groups of frame body assembly, the frame body assembly includes micro push rod, pressure sensor and rigid tab, the outer wall of micro push rod is provided with first frame, second frame.The utility model is through the setting of frame body assembly, uses separate lattice, and installs pressure sensor between micro push rod, the positive pressure when pipe passes through lattice during measurement experiment, the friction coefficient of the surface of pipe when pipe passes through different layer lattice is further calculated, so that the degree of automation of device improves, also improve work efficiency, through the setting of positioning assembly, positioning assembly overall structure is simple, improve the stability of coating tube in detection process.

Description

Technical Field

[0001] This utility model relates to the field of grid technology, specifically a grid for measuring the surface friction coefficient of nuclear fuel rods. Background Technology

[0002] The measurement of the surface friction coefficient of nuclear fuel rods is a specialized test conducted on the surface mechanical properties of nuclear fuel rods, a core component of nuclear reactors. The core objective is to quantitatively obtain the friction coefficient between the fuel rod surface and the contact medium, such as coolant and supporting structure, providing crucial data support for reactor safety design, fuel rod life assessment, and operation optimization.

[0003] The grid used for measuring the surface friction coefficient of nuclear fuel rods is a special simulation and auxiliary component in the experiment of measuring the surface friction coefficient of nuclear fuel rods. Its core function is to simulate the support and contact environment of the fuel rods by the grid of the real fuel assembly in the reactor, and to provide stable mechanical loading, contact positioning and structural fixation for the friction coefficient measurement, so as to ensure that the measurement process can reproduce the interaction between the fuel rods and the grid under real working conditions, thereby obtaining accurate friction coefficient data.

[0004] Existing grids for measuring the surface friction coefficient of nuclear fuel rods, based on simplified grid devices or full-size insertion force test benches, can measure the overall insertion resistance of fuel rods. However, this resistance includes the frictional coupling effect of multiple grid elements and the interference of guiding forces, and cannot effectively separate the true frictional force between the coating and the spring / boob interface within a single grid element. Furthermore, the normal clamping force of the grid on the cladding tube usually depends on the design value estimation or finite element inference, which is greatly affected by manufacturing tolerances and assembly stresses. Consequently, it is not possible to obtain the real-time normal pressure and frictional force during dynamic motion in a good synchronous manner. Utility Model Content

[0005] Therefore, the purpose of this utility model is to provide a grid for measuring the surface friction coefficient of nuclear fuel rods, so as to solve the technical problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a grid for measuring the surface friction coefficient of nuclear fuel rods, comprising a screw jack, a linear guide rail, and a coated tube. The top of the screw jack is equipped with a linear guide rail, and a positioning plate is installed on the central axis of the linear guide rail. Multiple sets of frame components are installed on the top of the positioning plate. Each frame component includes a miniature push rod, a pressure sensor, and a rigid protrusion. The outer wall of the miniature push rod is provided with a first frame and a second frame. A positioning component is also provided at one end of each frame component.

[0007] By adopting the above technical solution, through the setting of the frame components, using a separate grid, and installing pressure sensors between the micro push rods, the positive pressure when the tube passes through the grid during the experiment is measured. The friction coefficient of the tube surface when the tube passes through different layers of grid is further calculated, which improves the automation level of the device and the work efficiency. Moreover, the experimental results can provide theoretical guidance for actual engineering. Through the setting of the positioning component, a positioning component is set at one end of the frame component, and the positioning component is located on the central axis of the linear guide. The overall structure of the positioning component is simple and reasonable, which improves the stability of the coated tube during the testing process and facilitates the observation of the equipment by the staff.

[0008] The present invention is further configured such that a second frame is fitted inside the inner wall of the first frame, and a third frame is fitted inside the inner wall of the second frame, and a micro push rod is located between the first frame, the second frame, and the third frame.

[0009] Preferably, the arrangement of multiple frames effectively supports the micro push rod, improves the stability of the micro push rod in detecting the coated tube, and also facilitates the connection between the first frame and the positioning plate.

[0010] The present invention is further configured such that a pressure sensor is sleeved on the outer wall of the micro push rod, and a rigid protrusion and a spring plate are welded to the ends of the micro push rod respectively.

[0011] Preferably, this increases the degree of automation of the device and also improves work efficiency.

[0012] The present invention is further configured such that the third frame is sleeved on one end of the micro push rod near the rigid protrusion and the spring plate, and the rigid protrusion and the spring plate are distributed at right angles around the third frame.

[0013] Preferably, this improves the stability of the coated pipe during the testing process, and the experimental results can provide theoretical guidance for practical engineering.

[0014] The present invention is further configured such that the screw jack is connected to the frame, and a positioning plate is movably sleeved on the top of the linear guide rail, and a positioning component is provided at one end of the positioning plate.

[0015] Preferably, the positioning of the positioning plate and positioning components effectively improves the stability of the frame assembly during the inspection of the coated pipe, thus enhancing the practicality of the device.

[0016] The present invention is further configured such that multiple sets of frame components are installed on the top of the positioning plate, and the multiple sets of frame components are arranged opposite to each other on the top of the positioning plate.

[0017] As a preferred option,

[0018] The present invention is further configured such that the positioning component includes a connecting plate, a fixing block and a limiting block, and a tension sensor, and the fixing block is provided with limiting blocks at both ends.

[0019] Preferably, a split grid is used, and the friction coefficient of the pipe surface is calculated when the pipe passes through different layers of grid, which improves the working efficiency of the device.

[0020] The present invention is further configured such that the inner wall of the limiting block has a through hole, the connecting plate is bolted to the frame, and the fixing block is arranged opposite to the positioning plate.

[0021] Preferably, the through-hole facilitates the passage of the coating tube and limits its position.

[0022] The present invention is further configured such that the tension sensor is located between the two sets of limiting blocks, and the limiting blocks and the tension sensor are located on the same horizontal line.

[0023] Preferably, the installation of a tension sensor improves the automation of the device, making it easier for staff to observe the device and enhancing its practicality.

[0024] In summary, the present invention has the following main advantages: 1. This utility model adopts a split grid structure by setting up the frame components and installing pressure sensors between the micro push rods to measure the positive pressure when the tube passes through the grid during the experiment. It further calculates the friction coefficient of the tube surface when the tube passes through different layers of grid, which improves the automation level of the device and the work efficiency. Moreover, the experimental results can provide theoretical guidance for actual engineering.

[0025] 2. This utility model features a positioning component. A positioning component is provided at one end of the frame component and is located on the central axis of the linear guide rail. The overall structure of the positioning component is simple and reasonable, which improves the stability of the coated pipe during the testing process and facilitates the observation of the equipment by the staff. Attached Figure Description

[0026] Figure 1 This is a front perspective view of the present utility model; Figure 2 This is a top view of the present invention; Figure 3 This is a three-dimensional schematic diagram of the frame component structure of this utility model; Figure 4 This is a front view of the frame assembly of this utility model; Figure 5 This is a schematic diagram of the positioning component structure of this utility model.

[0027] Explanation of reference numerals in the attached figures: 1. Screw jack; 2. Linear guide rail; 3. Positioning plate; 4. Frame assembly; 40. First frame; 41. Second frame; 42. Third frame; 43. Miniature push rod; 44. Pressure sensor; 45. Rigid protrusion; 46. Spring plate; 5. Positioning assembly; 50. Connecting plate; 51. Fixing block; 52. Limiting block; 53. Tension sensor; 6. Coated tube. Detailed Implementation

[0028] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0029] The embodiments of this utility model will be described below based on its overall structure.

[0030] First embodiment: A grid for measuring the surface friction coefficient of nuclear fuel rods, please refer to [link / reference]. Figures 1-5 The system includes a screw jack 1, a linear guide rail 2, and a coated pipe 6. The linear guide rail 2 is mounted on the top of the screw jack 1, and a positioning plate 3 is mounted on the central axis of the linear guide rail 2. Multiple frame assemblies 4 are mounted on the top of the positioning plate 3. Each frame assembly 4 includes a miniature push rod 43, a pressure sensor 44, and a rigid protrusion 45. The outer wall of the miniature push rod 43 is provided with a first frame 40 and a second frame 41. A positioning assembly 5 is also provided at one end of the frame assembly 4. Through the arrangement of the frame assembly 4, a split grid is adopted, and pressure sensors are installed between the miniature push rods 43. Device 44 measures the positive pressure when the tube passes through the grid during the experiment, and further calculates the friction coefficient of the tube surface when the tube passes through different layers of grid, which improves the automation level of the device and the work efficiency. Moreover, the experimental results can provide theoretical guidance for actual engineering. Through the setting of positioning component 5, a positioning component 5 is set at one end of the frame component 4, and the positioning component 5 is located on the central axis of the linear guide rail 2. The overall structure of positioning component 5 is simple and reasonable, which improves the stability of the coated tube 6 during the testing process and makes it easier for staff to observe the equipment.

[0031] For details regarding the above embodiments, please refer to [link / reference]. Figures 1-4 The inner wall of the first frame 40 is fitted with a second frame 41, and the inner wall of the second frame 41 is fitted with a third frame 42. The micro push rod 43 is located between the first frame 40, the second frame 41, and the third frame 42. The arrangement of multiple frames effectively supports the micro push rod 43, improves the stability of the micro push rod 43 in detecting the coated tube 6, and also facilitates the connection between the first frame 40 and the positioning plate 3.

[0032] For details regarding the above embodiments, please refer to [link / reference]. Figures 1-4A pressure sensor 44 is fitted on the outer wall of the miniature push rod 43, and a rigid protrusion 45 and a spring plate 46 are welded to the ends of the miniature push rod 43, which improves the automation level of the device and also improves the work efficiency.

[0033] For details regarding the above embodiments, please refer to [link / reference]. Figures 1-4 The third frame 42 is fitted on one end of the miniature push rod 43 near the rigid protrusion 45 and the spring plate 46, and the rigid protrusion 45 and the spring plate 46 are distributed at right angles around the third frame 42, which improves the stability of the coated tube 6 during the testing process, and the experimental results can provide theoretical guidance for practical engineering.

[0034] For details regarding the above embodiments, please refer to [link / reference]. Figures 1-5 The screw jack 1 is connected to the frame, and the top of the linear guide rail 2 is movably fitted with a positioning plate 3, and one end of the positioning plate 3 is provided with a positioning component 5. The positioning of the positioning plate 3 and the positioning component 5 effectively improves the stability of the frame assembly 4 when inspecting the coated pipe 6, and improves the practicality of the device.

[0035] For details regarding the above embodiments, please refer to [link / reference]. Figure 1 , Figure 2 Multiple sets of frame components 4 are installed on the top of the positioning plate 3, and the multiple sets of frame components 4 are arranged opposite to each other on the top of the positioning plate 3. The separate grid is adopted, and the friction coefficient of the pipe surface when the pipe passes through different layers of grid is calculated, which improves the working efficiency of the device.

[0036] Second embodiment: Please refer to Figure 5 The difference between Embodiment 2 and Embodiment 1 is that, while retaining the features of Embodiment 1, a positioning component 5 is added to one end of the frame assembly 4. The positioning component 5 assists the frame assembly 4, effectively limiting the coated tube 6 and improving the stability of the equipment during testing. The positioning component 5 includes a connecting plate 50, a fixing block 51, a limiting block 52, and a tension sensor 53. The installation of the tension sensor 53 improves the automation of the device, and the overall structure of the positioning component 5 is simple, making it easy for operators to observe the device and improving its practicality.

[0037] In practical operation, this utility model is as follows: First, install the frame assembly 4 and positioning assembly 5 on the appropriate equipment frame, then start the drive motor. The motor drives the drum to rotate at a constant speed. Adjusting the speed of the drive motor can adjust the speed at which the rope pulls the coating tube 6. Record the initial value N1 of the tension sensor 53. After the coating tube 6 passes through the tube and is positioned, start the atomizing sprayer to prepare a water film on the surface of the tube. When the coating tube 6 enters the constant temperature chamber and comes into contact with the water film on the surface of the low temperature gas, it freezes into an ice film. Then, it enters the ferrule hole of the split grid. At this time, the value of the tension sensor 53 changes and is recorded as N2. The values ​​of the four pressure sensors 44 of the first layer of the split grid also change. The value of the pressure sensor 44 at the spring plate 46 in the X-axis direction of the first layer of the split grid is recorded as Fx1, the value of the pressure sensor 44 at the rigid protrusion 45 in the X-axis direction of the first layer of the split grid is recorded as fx1, the value of the pressure sensor 44 at the spring plate 46 in the Y-axis direction of the first layer of the split grid is recorded as Fy1, and the value of the pressure sensor 44 at the rigid protrusion 45 in the Y-axis direction of the first layer of the split grid is recorded as fy1. Similarly, the Cr coating and the coating tube 6 pass through eight grid devices in succession, and the values ​​N3……N9, Fx2……Fx8, Fy2……Fy8, fx2……fx8, fy2……fy8 are recorded. Based on the recorded values, μX2……μX8, μx2……μx8, μY2……μY8, μy2……μy8 can be calculated.

[0038] Although embodiments of the present invention have been shown and described, these specific embodiments are merely explanations of the present invention and are not intended to limit the invention. The specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. After reading this specification, those skilled in the art may make modifications, substitutions, and variations to the embodiments as needed without departing from the principles and spirit of the present invention, provided that such modifications, substitutions, and variations are within the scope of the claims of the present invention and are protected by patent law.

Claims

1. A grid for measuring the surface friction coefficient of nuclear fuel rods, comprising a screw jack (1), a linear guide rail (2), and a coated tube (6), characterized in that: The top of the screw jack (1) is equipped with a linear guide rail (2), and a positioning plate (3) is installed on the central axis of the linear guide rail (2). Multiple sets of frame components (4) are installed on the top of the positioning plate (3). The frame components (4) include a miniature push rod (43), a pressure sensor (44), and a rigid protrusion (45). The outer wall of the miniature push rod (43) is provided with a first frame (40) and a second frame (41). A positioning component (5) is also provided at one end of the frame components (4).

2. The grid for measuring the surface friction coefficient of nuclear fuel rods according to claim 1, characterized in that: The inner wall of the first frame (40) is fitted with a second frame (41), and the inner wall of the second frame (41) is fitted with a third frame (42), and the micro push rod (43) is located between the first frame (40), the second frame (41), and the third frame (42).

3. The grid for measuring the surface friction coefficient of nuclear fuel rods according to claim 1, characterized in that: The outer wall of the micro push rod (43) is fitted with a pressure sensor (44), and the ends of the micro push rod (43) are respectively welded with a rigid protrusion (45) and a spring plate (46).

4. A grid for measuring the surface friction coefficient of nuclear fuel rods according to claim 2, characterized in that: The third frame (42) is sleeved on one end of the micro push rod (43) near the rigid protrusion (45) and the spring plate (46), and the rigid protrusion (45) and the spring plate (46) are distributed at right angles around the third frame (42).

5. A grid for measuring the surface friction coefficient of nuclear fuel rods according to claim 1, characterized in that: The screw jack (1) is connected to the frame, and the top of the linear guide rail (2) is movably fitted with a positioning plate (3), and one end of the positioning plate (3) is provided with a positioning component (5).

6. The grid for measuring the surface friction coefficient of nuclear fuel rods according to claim 1, characterized in that: The top of the positioning plate (3) is equipped with multiple sets of frame components (4), and the multiple sets of frame components (4) are arranged opposite to each other on the top of the positioning plate (3).

7. A grid for measuring the surface friction coefficient of nuclear fuel rods according to claim 1, characterized in that: The positioning component (5) includes a connecting plate (50), a fixing block (51), a limiting block (52), and a tension sensor (53), and both ends of the fixing block (51) are provided with limiting blocks (52).

8. A grid for measuring the surface friction coefficient of nuclear fuel rods according to claim 7, characterized in that: The inner wall of the limiting block (52) is provided with a through hole, and the connecting plate (50) is bolted to the frame, and the fixing block (51) is arranged opposite to the positioning plate (3).

9. A grid for measuring the surface friction coefficient of nuclear fuel rods according to claim 7, characterized in that: The tension sensor (53) is located between the two sets of limiting blocks (52), and the limiting blocks (52) and the tension sensor (53) are located on the same horizontal line.

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