Two-dimensional stroke extension radiation relaxation fully automatic detection device and method

Abstract

The invention discloses a two-dimensional stroke extended irradiation relaxation fully automatic detection device and method, belonging to the field of material property measurement; an X-direction motion guide rail assembly is fixedly mounted on a vibration isolation platform, a Y-direction motion guide rail assembly can be mounted on the X-direction motion guide rail assembly for reciprocating motion along the X direction, a horizontal linear motion slider can be mounted on the Y-direction motion guide rail assembly for reciprocating motion along the Y direction, an irradiation relaxation assembly is fixedly mounted on the horizontal linear motion slider, a pressure measurement system and a bracket are fixedly mounted on the vibration isolation platform in sequence, a box cover grabbing assembly and a bolt automatic screwing in and out and gas exchange system are installed in sequence along the Y direction on the same side of the bracket, and detection is completed by the mutual cooperation of the irradiation relaxation assembly with the bolt automatic screwing in and out and gas exchange system, the box cover grabbing assembly and the pressure measurement system in sequence; the problem of fully automatic and high-precision measurement of irradiation relaxation characteristics is solved.

Description

Technical Field

[0001] The invention belongs to the technical field of radiation relaxation characteristic measurement, and in particular relates to a fully automatic detection device and method for radiation relaxation with extended stroke. Background Art

[0002] In the nuclear industry and other fields, nuclear safety issues have always been the focus of domestic and foreign social attention, which affects people's life and property safety, environmental sustainable development and stable economic operation. Among them, structural parts often creep under high temperature and radiation conditions during service, resulting in a decrease in the internal stress of the material. This phenomenon is called radiation relaxation. Radiation relaxation can cause structural parts to fail. In order to avoid this problem, it is necessary to understand the radiation relaxation characteristics of materials and select materials with suitable performance to make structural parts. Therefore, the measurement and research of the relaxation characteristics of structural materials becomes particularly important.

[0003] At present, there are relatively more theoretical calculations on the stress, stiffness and other properties of structural parts, but there are few experimental measurements and analyses of the relaxation characteristics of structural parts after irradiation. Therefore, it is extremely important to carry out measurements of the relaxation characteristics of structural parts after irradiation.

[0004] Zhang Shiquan proposed a method for measuring the irradiation relaxation characteristics of a single spring sheet and a method for measuring the relaxation of four types of grid clamping forces (Zhang Shiquan. Research on irradiation relaxation of the clamping force of the PWR fuel assembly positioning grid [J]. Nuclear Power Engineering, 1987 (01): 17-23.). The irradiation relaxation measurement of a single spring sheet uses a fixture structure composed of three layers of flat plates to make the spring sheet conform to the actual working conditions as much as possible. The three layers of the fixture are the upper plate, the middle plate and the lower plate. The middle plate has a long groove, and its groove width corresponds to the size of the grid element; the spring sheet is clamped between the middle plate and the lower plate, and the spring wave peak protrudes from the middle plate groove; the spring compression amount is adjusted by the gasket of different thicknesses between the middle plate and the upper plate; the three plates are fixed with bolts; thus simulating its actual stress state and boundary conditions. After a series of operation steps, the spring relaxation amount is calculated based on the spring force in the cold state and the irradiated state. The literature uses four methods to measure the relaxation of the grid clamping force: in-pile irradiation of small grids, measurement of the moving force and sliding force of fuel rods, measurement of the friction force of grid elements, and measurement of the geometric dimensions of grid elements. In summary, the technical solution proposed in the literature has the following characteristics: (1) The four methods for measuring the relaxation of the grid clamping force are all relaxation characteristics measurements for the overall structure of the grid, and none of them can measure the relaxation characteristics of the material itself without specific structural characteristics; (2) The spring force is obtained by measuring and drawing the spring load-displacement curve under different states, and then the spring relaxation amount is calculated. This method is prone to large errors. (3) The spring compression amount is adjusted by using gaskets of different thicknesses between the middle plate and the upper plate. The adjustment process is short and there are sudden changes, which can easily cause damage to the spring sheet sample and the measuring device. This technical solution is difficult to achieve fully automatic and high-precision measurement of irradiation relaxation characteristics.

[0005] Kenfield TA et al. proposed a method for measuring irradiation relaxation characteristics and designed a measuring device (Kenfield TA, Busboom HJ, Appleby WK. In-reactor stress relaxation in bending of 20% cold-worked 316 stainless steel [J]. North-Holland, 1977, 65.). A plurality of two-point support and two-point downward pressure structures are set in the device, so that the irradiation relaxation sample forms a beam bending model, and the stress is calculated using the beam bending theory and the beam deflection, and then the relaxation conditions under different irradiation conditions are calculated and compared. This technical solution has limited measurement accuracy and space constraints. It is impossible to use external more precise devices to measure the irradiation relaxation samples, and it is difficult to achieve fully automatic and high-precision measurement of irradiation relaxation characteristics.

[0006] One of the keys to measuring the relaxation characteristics of materials is to measure the internal stress of the materials. The internal stress measurement process requires high-precision measurement of the force applied to the material sample and the resulting deformation or displacement. This includes the measurement of the relationship between the force applied by the force measuring device to the material sample and the distance the device pushes the pressure head to move. In order to obtain a more accurate description of the relationship, it is expected to obtain a longer distance under the same force conditions. This process is difficult to achieve fully automatically, which also means that there is currently no fully automatic, high-precision irradiation relaxation characteristics measurement solution.

[0007] In summary, it is difficult to achieve fully automatic and high-precision measurement of irradiation relaxation characteristics in existing research. Therefore, it is urgent to propose a fully automatic and high-precision irradiation relaxation measurement device and method to meet the needs of my country in the field of precision measurement of material irradiation relaxation characteristics. Summary of the invention

[0008] The purpose of the present invention is to address the problems existing in the above-mentioned prior art and to propose a two-dimensional stroke expansion irradiation relaxation fully automatic detection device and method to achieve fully automatic and high-precision measurement of irradiation relaxation characteristics.

[0009] In order to achieve the above-mentioned object of the invention, the technical solution provided by the present invention is as follows:

[0010] The fully automatic detection device for irradiation relaxation of two-dimensional stroke extension includes a vibration isolation table, an X-axis motion guide rail assembly, a Y-axis motion guide rail assembly, a horizontal linear motion slider, a box cover grabbing assembly, and a bolt automatic screwing in and out and gas exchange system. The vibration isolation table is composed of a high-flatness table plate, a high-strength bracket and a high-performance vibration isolator assembly. The high-performance vibration isolator is supported and installed on the upper part of the high-strength bracket, and a high-flatness table plate is installed on the upper end of the high-performance vibration isolator; the X-axis motion guide rail assembly is fixed on the vibration isolation table, and the Y-axis motion guide rail assembly can be moved along the It is mounted on the X-direction motion guide rail assembly for reciprocating motion in the X-direction, a horizontal linear motion slider can be mounted on the Y-direction motion guide rail assembly for reciprocating motion in the Y-direction, an irradiation relaxation assembly is fixedly mounted on the horizontal linear motion slider, a pressure measurement system and a bracket are fixedly mounted on the vibration isolation stand in sequence, a box cover grasping assembly and an automatic bolt screwing in and out and gas exchange system are mounted in sequence along the Y-direction on the same side of the bracket, and the pressure measurement system, the box cover grasping assembly and the automatic bolt screwing in and out and gas exchange system are located above the irradiation relaxation assembly.

[0011] The fully automatic detection method of two-dimensional stroke extension irradiation relaxation includes the following steps:

[0012] Step 1, fix the irradiation relaxation component on the horizontal linear motion slider, and drive the irradiation relaxation component to move to the automatic screwing in and out of the bolts and the gas exchange system and the box cover grabbing component in sequence through the X-direction movement of the Y-direction motion guide rail component on the X-direction motion guide rail component and the Y-direction movement of the horizontal linear motion slider on the Y-direction motion guide rail component, and disassemble the irradiation relaxation component by the automatic screwing in and out of the bolts and the gas exchange system and the box cover grabbing component to expose the irradiation relaxation sample;

[0013] Step 2: The Y-direction motion guide assembly moves in the X-direction motion assembly and the horizontal linear motion slider moves in the Y-direction motion on the Y-direction motion guide assembly, and the horizontal linear motion slider drives the irradiation relaxation assembly without a box cover to move to the position of the pressure measurement system, and the relaxation of the irradiation relaxation sample in the irradiation relaxation assembly is measured according to the following method:

[0014] A. The precision linear motion slide rail drives the pressure measuring mechanism to descend, and the precision pressure head gradually approaches the irradiated relaxation sample. At this time, the elongation of the precision tension spring caused by the hanging vertical linear motion slide is fixed. In this process, the displacement, force and stretching of the precision pressure head in the pressure measuring mechanism are analyzed;

[0015] B. The precision linear motion slide rail drives the pressure measuring mechanism to continue to descend, and the precision pressure head makes virtual contact with the irradiated relaxed sample. The sample is about to change from a two-point support and two-point downward pressure state to a two-point support and four-point downward pressure state. The precision tension spring is about to retract and the elongation is about to decrease. In this process, the displacement, force and stretching of the precision pressure head and the precision tension spring are analyzed;

[0016] C. The precision linear motion slide rail drives the pressure measuring mechanism to continue to descend. When the precision pressure head presses down on the irradiated relaxed sample, making the irradiated relaxed sample in a two-point support and four-point pressure state, the displacement, force and stretching of the precision pressure head and the precision tension spring are analyzed;

[0017] D. The precision linear motion slide rail drives the pressure measuring mechanism to continue to descend. When the maximum internal stress of the irradiated relaxed sample does not exceed its yield strength, the descent of the pressure measuring mechanism is stopped. During this process, the irradiated relaxed sample changes from a two-point supported four-point pressed state to a new two-point supported two-point pressed state. The displacement, force and stretching of the precision pressure head and the precision tension spring are analyzed.

[0018] E. The precision linear motion slide rail drives the pressure measuring mechanism to rise and return to the state before step A. During this process, the displacement, force and stretching of the precision pressure head and the precision tension spring are analyzed;

[0019] F. According to the displacement, force and stretching of the precision pressure head, calculate the change of the internal stress of the irradiated relaxation sample, and calculate the maximum internal stress value when the irradiated relaxation sample changes from the two-point support and four-point downward pressure state to the new two-point support and two-point downward pressure state, so as to calculate the irradiation relaxation amount of the sample under different irradiation conditions;

[0020] Step 3, driven by the X-direction motion guide rail assembly and the Y-direction motion guide rail assembly, the self-sealing irradiation relaxation assembly is driven by the horizontal linear motion slider to move to the automatic screw-in and screw-out of the bolts and the gas exchange system and the box cover grabbing assembly in sequence, and the irradiation relaxation assembly is reassembled by the automatic screw-in and screw-out of the bolts and the gas exchange system and the box cover grabbing assembly;

[0021] Step 4: The horizontal linear motion slider drives the irradiation relaxation component to move to the position before step 1, and the irradiation relaxation component is removed from the horizontal linear motion slider to complete the stroke extension irradiation relaxation automatic detection of the irradiation relaxation sample.

[0022] The present invention has the following advantages:

[0023] (1) The present invention can realize the fully automatic detection of the radiation relaxation characteristics of materials. The existing radiation relaxation detection devices and methods have failed to solve the problem of fully automatic detection of the radiation relaxation characteristics of materials; the present invention proposes a fully automatic detection solution for radiation relaxation characteristics based on the principle of stress method, which fully automatically measures the maximum internal stress of the radiation relaxation sample under a specific bending state, and finally obtains the relaxation characteristics of the radiation relaxation sample under different irradiation conditions; it solves the problem that the existing technology has failed to solve the fully automatic detection of the radiation relaxation characteristics of materials. This is one of the innovative points that distinguish the present invention from the existing technology.

[0024] (2) The present invention proposes a high-precision irradiation relaxation measurement solution with extended stroke to improve the accuracy of the measurement results. By extending the stroke of the irradiation relaxation measurement solution, the number of points measured by the force measurement system increases significantly when the irradiation relaxation sample changes from a two-point support and four-point downward pressure state in the box body to a new two-point support and two-point downward pressure state, thereby improving the accuracy of data processing, and further improving the accuracy, repeatability, stability, etc. of the measurement. This is the second innovation of the present invention that distinguishes it from the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the overall structure of a two-dimensional stroke extension irradiation relaxation fully automatic detection device;

[0026] Figure 2 It is a schematic diagram of the pressure measurement system structure;

[0027] Figure 3 It is a schematic diagram of the structure of the pressure measurement mechanism;

[0028] Figure 4 is a schematic diagram of the structure of the irradiation relaxation assembly and the irradiation relaxation sample;

[0029] Figure 5 It is a schematic diagram of the vent bolt;

[0030] Figure 6 It is a schematic diagram of the radiation-relaxed sample supported at two points and pressed down at two points;

[0031] Figure 7 This is a schematic diagram of the radiation-relaxed sample being supported at two points and pressed down at four points.

[0032] Part number description in the figure: 1. Vibration isolation stand; 1.1. High flatness table; 1.2. High strength bracket; 1.3. High performance vibration isolator; 2. X-axis motion guide rail assembly; 3. Pressure measurement system; 3.1. Positioning frame; 3.2. Precision linear motion slide rail; 3.3. Mounting plate; 3.4. Radiation shielding shell; 3.5. Pressure measurement mechanism; 3.5.1. Flat seat plate; 3.5.2. Precision tension spring; 3.5.3. Vertical linear motion slide block; 3.5.4. High-precision force sensor; 3.5.5. Precision pressure head; 3.5.6. Guide control column; 4. Bracket; 5. Horizontal linear motion slide block; 6. Radiation irradiation relaxation assembly; 6.1, box cover; 6.2, sealing gasket A; 6.3, box body; 6.4, sealing gasket B; 6.5, end cover; 6.6, locking bolt B; 6.7, locking bolt A; 6.8, vent bolt; 6.8.1, vent A; 6.8.2, vent B; 6.8.3, T-shaped airway; 6.8.4, bolt body; 6.9, irradiation relaxation sample; 7, box cover grabbing assembly; 8, bolt automatic screwing in and out and gas exchange system; 9, Y-axis motion guide rail assembly; h, irradiation relaxation sample thickness; L, distance between two inner support points; A, distance between two ends of precision pressure head; F, precision pressure head pressure value. DETAILED DESCRIPTION

[0033] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0034] Embodiment 1

[0035] The fully automatic detection device for irradiation relaxation of two-dimensional stroke extension comprises a vibration isolation table 1, an X-axis motion guide rail assembly 2, a Y-axis motion guide rail assembly 9, a horizontal linear motion slider 5, a box cover grasping assembly 7 and a bolt automatic screwing-in and screwing-out and gas exchange system 8. The vibration isolation table 1 is composed of a high-flatness table plate 1.1, a high-strength bracket 1.2 and a high-performance vibration isolator 1.3. The high-performance vibration isolator 1.3 is supported and installed on the upper part of the high-strength bracket 1.2, and the high-flatness table plate 1.1 is installed on the upper end of the high-performance vibration isolator 1.3; the X-axis motion guide rail assembly 2 is fixedly installed on the vibration isolation table 1, and the Y-axis motion guide rail assembly 9 is fixedly installed on the Y-axis motion guide rail assembly 9. The moving guide rail assembly 9 can be mounted on the X-direction motion guide rail assembly 2 so as to reciprocate along the X-direction. A horizontal linear motion slider 5 can be installed on the Y-direction motion guide rail assembly 9 so as to reciprocate along the Y-direction. An irradiation relaxation assembly 6 is fixedly mounted on the horizontal linear motion slider 5. A pressure measurement system 3 and a bracket 4 are fixedly mounted on the vibration isolation stand 1 in sequence. A box cover grasping assembly 7 and an automatic bolt screwing-in and screwing-out and gas exchange system 8 are installed in sequence on the same side of the bracket 4 in the Y-direction. The pressure measurement system 3, the box cover grasping assembly 7 and the automatic bolt screwing-in and screwing-out and gas exchange system 8 are located above the irradiation relaxation assembly 6.

[0036] The pressure measurement system 3 comprises a system frame 3.1, a precision linear motion slide rail 3.2, a mounting plate 3.3, a radiation shielding shell 3.4 and a pressure measurement mechanism 3.5; the precision linear motion slide rail 3.2 is mounted on the system frame 3.1 so as to be movable up and down in the vertical direction, the mounting plate 3.3 is fixed on the precision linear motion slide rail 3.2, the pressure measurement mechanism 3.5 and the radiation shielding shell 3.4 are mounted on the lower end of the mounting plate 3.3, the radiation shielding shell 3.4 is located on the outer side of the pressure measurement mechanism 3.5 and surrounds the pressure measurement mechanism 3.5; the pressure measurement mechanism 3.5 is composed of a flat seat plate 3.5.1, a precision tension spring 3.5.2, a vertical linear motion slider 3.5.3, a high-precision force sensor 3.5.4, a precision pressure head 3.5.5 and a guide control column 3.5.6; the flat seat plate 3.5.1 is fixed on On the lower end of the mounting plate 3.3, guide control columns 3.5.6 are symmetrically mounted on the lower end of the flat seat plate 3.5.1, and the vertical linear motion slider 3.5.3 is mounted between the symmetrically arranged guide control columns 3.5.6 so as to be reciprocatingly movable up and down. The precision tension spring 3.5.2 is arranged between the lower part of the flat seat plate 3.5.1 and the upper part of the vertical linear motion slider 3.5.3. The upper and lower ends of the precision tension spring 3.5.2 are respectively fixedly connected to the flat seat plate 3.5.1 and the vertical linear motion slider 3.5.3, and the vertical linear motion slider 3.5.3 is elastically suspended on the flat seat plate 3.5.1. A high-precision force sensor 3.5.4 is mounted on the lower end surface of the vertical linear motion slider 3.5.3, and a precision pressure head 3.5.5 is mounted on the lower end surface of the high-precision force sensor 3.5.4.

[0037] The structure of the irradiation relaxation component 6 is as follows: an irradiation relaxation sample 6.9 is installed in a box body 6.3 in a two-point support and two-point downward pressure manner, a sealing gasket A6.2 and a box cover 6.1 are arranged in sequence from bottom to top on the upper end of the box body 6.3, the box cover 6.1 is fixed to the upper end surface of the box body 6.3 by means of locking bolts A6.7 and vent bolts 6.8, and end covers 6.5 are respectively fixed to the end surfaces of both sides of the box body 6.3 by means of locking bolts B6.6, and a sealing gasket B6.4 is arranged on the area between the two end surfaces of the box body 6.3 and the end covers 6.5; a T-shaped airway 6.8.3 is arranged in the bolt body 6.8.4 of the vent bolt 6.8, and vent holes A6.8.1 and vent holes B6.8.2 are respectively arranged on the side and bottom of the bolt body 6.8.4, and the vent holes A6.8.1 and vent holes B6.8.2 are respectively connected to the T-shaped airway 6.8.3.

[0038] Embodiment 2

[0039] The fully automatic detection method of two-dimensional stroke extension irradiation relaxation includes the following steps:

[0040] Step 1, fix the irradiation relaxation component 6 on the horizontal linear motion slider 5, drive the irradiation relaxation component 6 to move to the bolt automatic screwing in and out and gas exchange system 8 through the X-direction movement of the Y-direction motion guide rail component 9 on the X-direction motion guide rail component 2 and the Y-direction movement of the horizontal linear motion slider 5 on the Y-direction motion guide rail component 9, and screw the locking bolt A and the vent bolt 6.8 out of the box body 6.3 and the box cover 6.1 of the irradiation relaxation component 6 through the bolt automatic screwing in and out and the gas exchange system 8;

[0041] Step 2: On the Y-direction motion guide rail assembly 9, the horizontal linear motion slider 5 drives the irradiation relaxation assembly 6 to move to the box cover grabbing assembly 7, and the box cover 6.1 is removed from the irradiation relaxation assembly 6;

[0042] Step 3, the Y-direction motion guide assembly 9 moves in the X-direction motion assembly and the horizontal linear motion slider 5 moves in the Y-direction motion on the Y-direction motion guide assembly 9, and the horizontal linear motion slider 5 drives the irradiation relaxation assembly 6 without the box cover 6.1 to move to the position of the pressure measurement system 3, and the relaxation of the irradiation relaxation sample 6.9 in the irradiation relaxation assembly 6 is measured according to the following method:

[0043] A. The precision linear motion slide 3.2 drives the pressure measuring mechanism 3.5 to descend, and the precision pressure head 3.5.5 gradually approaches the irradiated relaxation sample 6.9. At this time, the elongation of the precision tension spring 3.5.2 caused by the hanging vertical linear motion slide is fixed. In this process, the displacement, force and stretching of the precision pressure head 3.5.5 in the pressure measuring mechanism 3.5 are analyzed;

[0044] B. The precision linear motion slide 3.2 drives the pressure measuring mechanism 3.5 to continue to descend, and the precision pressure head 3.5.5 makes virtual contact with the irradiated relaxed sample 6.9. The sample is about to change from a two-point support and two-point downward pressure state to a two-point support and four-point downward pressure state. The precision tension spring 3.5.2 is about to retract and the elongation is about to decrease. In this process, the displacement and force of the precision pressure head 3.5.5 and the stretching of the precision tension spring 3.5.2 are analyzed;

[0045] C. The precision linear motion slide 3.2 drives the pressure measuring mechanism 3.5 to continue to descend. When the precision pressure head 3.5.5 presses down on the irradiated relaxed sample 6.9, so that the irradiated relaxed sample 6.9 is in a two-point support and four-point downward pressure state, the displacement and force of the precision pressure head 3.5.5 and the stretching of the precision tension spring 3.5.2 are analyzed;

[0046] D. The precision linear motion slide 3.2 drives the pressure measuring mechanism 3.5 to continue to descend. When the maximum internal stress of the irradiated relaxed sample 6.9 does not exceed its yield strength, the descent of the pressure measuring mechanism 3.5 is stopped. During this process, the irradiated relaxed sample 6.9 changes from a two-point supported four-point pressed state to a new two-point supported two-point pressed state. The displacement and force of the precision pressure head 3.5.5 and the stretching of the precision tension spring 3.5.2 are analyzed.

[0047] E. The precision linear motion slide 3.2 drives the pressure measuring mechanism 3.5 to rise and return to the state before step A. In this process, the displacement and force of the precision pressure head 3.5.5 and the stretching of the precision tension spring 3.5.2 are analyzed;

[0048] F. According to the displacement and force of the precision pressure head 3.5.5 and the stretching of the precision tension spring 3.5.2, calculate the change of the internal stress of the irradiated relaxed sample 6.9, and calculate the maximum internal stress value of the irradiated relaxed sample 6.9 when it changes from a two-point support and four-point downward pressure state to a new two-point support and two-point downward pressure state, so as to calculate the irradiation relaxation amount of the sample under different irradiation conditions;

[0049] Step 4: Driven by the X-direction motion guide rail assembly 2 and the Y-direction motion guide rail assembly 9, the horizontal linear motion slider 5 drives the irradiation relaxation assembly 6 to move to the box cover grabbing assembly 7, and the box cover 6.1 is installed back on the box body 6.3 of the irradiation relaxation assembly 6;

[0050] Step 5, the X-direction motion guide rail assembly 2 and the Y-direction motion guide rail assembly 9 drive the irradiation relaxation assembly 6 to move to the bolt automatic screwing in and out and gas exchange system 8 through the horizontal linear motion slider 5, screw all the locking bolts A into the box cover 6.1 and the box body 6.3 of the irradiation relaxation assembly 6, partially screw the vent bolt 6.8 into the box cover 6.1 and the box body 6.3, so that the vent hole A6.8.1 is exposed outside the box body 6.3, the irradiation relaxation assembly 6 is connected with the vent hole A6.8.1, and inert gas is filled into the irradiation relaxation assembly 6, then the irradiation relaxation assembly 6 is separated from the vent hole A6.8.1, the bolts are automatically screwed in and out and the gas exchange system 8, and the vent bolt 6.8 is completely screwed into the box cover 6.1 and the box body 6.3;

[0051] Step 6: The horizontal linear motion slider 5 drives the irradiation relaxation component 6 to move to the position before step 1, and the irradiation relaxation component 6 is removed from the horizontal linear motion slider 5, completing the stroke extension irradiation relaxation fully automatic detection of the irradiation relaxation sample 6.9.

[0052] During the test, the displacement and force of the precision indenter are measured, including the precision tension spring 3.5.2 exerting a vertical upward tension F on the vertical linear motion slide 3.5.3 and the precision indenter 3.5.5 T When the precision indenter 3.5.5 contacts the irradiated relaxed sample 6.9, the irradiated relaxed sample 6.9 applies a vertical upward supporting force F N ; The precision pressure head 3.5.5 is subjected to force balance during the process of vertical downward uniform linear motion, that is, the gravity G = F T +F N ; Due to F T The existence of F N It will change with the downward displacement of the precision pressure head 3.5.5, so that the time required for the value measured by the high-precision force sensor 3.5.4 to change from 0 to G is longer, and the movement stroke of the motor that controls the descent of the pressure measuring mechanism 3.5 is extended; the pressure measurement system 3 has a fixed acquisition frequency for the measured value, so that in the process of the precision pressure head 3.5.5 from contacting the irradiated relaxed sample 6.9 to causing the irradiated relaxed sample 6.9 to undergo a state change of "two-point support and two-point pressure-two-point support and four-point pressure-new two-point support and two-point pressure" in the box body 6.3, the number of measured points collected by the pressure measurement system 3 is greatly increased, thereby achieving improved accuracy in data processing, and further improving accuracy, repeatability and stability of measurement.

[0053] Calculate the maximum internal stress value of the irradiated relaxed sample when it changes from a two-point support and four-point downward pressure state to a new two-point support and two-point downward pressure state in the box, including: obtaining the thickness h, width b, distance L between the two support points of the irradiated relaxed sample 6.9, the distance A between the two lower ends of the precision indenter 3.5.5, the force value F measured by the high-precision force sensor 3.5.4, and the maximum internal stress value σ=3F(AL) / (bh 2 ), where the thickness h, width b, distance L between two support points, and distance A between precision indenters are in meters.

[0054] The explanation is as follows: The two-point support and two-point pressure model is as follows Figure 6 As shown in the figure, when the irradiated relaxed sample 6.9 is placed in the box body 6.3, there are four contact points with the box body 6.3. The ones on the left and right sides are called external downward pressure points, and the two in the middle are called internal support points. The irradiated relaxed sample 6.9 is subjected to four forces from the box body 6.3, which correspond to the external downward pressure points and the internal support points and are called external downward pressure and internal support force respectively. When the precision pressure head 3.5.5 descends and contacts the irradiated relaxed sample 6.9, it continues to press down, and the irradiated relaxed sample 6.9 becomes as shown in the figure in the box body 6.3. Figure 7 The two-point support and four-point downward pressure state shown. The pressure of the precision indenter 3.5.5 on the irradiated relaxed sample 6.9 gradually increases, and the external downward pressure gradually decreases; when the external downward pressure decreases to zero, the irradiated relaxed sample 6.9 and the external downward pressure point become virtual contact. At this time, the position where the precision indenter 3.5.5 and the irradiated relaxed sample 6.9 contact can be regarded as a new "external downward pressure point", so that the irradiated relaxed sample 6.9 is in a new two-point support and two-point downward pressure state.

[0055] The method for calculating the relaxation amount of 6.9 irradiation-relaxed sample under certain irradiation conditions comprises the following steps:

[0056] Step 1, obtaining the maximum internal stress value σ0 of the irradiated relaxed sample 6.9 when it changes from a two-point supported four-point pressed state to a new two-point supported two-point pressed state in the box body 6.3 at room temperature without being irradiated;

[0057] Step 2, obtaining the maximum internal stress value σ of the irradiated relaxed sample 6.9 at room temperature and under certain irradiation, when the state of two-point support and four-point downward pressure changes to a new state of two-point support and two-point downward pressure in the box body 6.3;

[0058] Step 3: Irradiate the relaxed sample 6.9 under certain irradiation conditions, where the relaxation amount η = |(σ-σ0) / σ0|×100%.

[0059] By adopting the above-mentioned implementation mode, it is possible to detect the radiation relaxation characteristics of the material itself. The radiation relaxation sample 6.9 is placed in the radiation relaxation device, and the device is placed on the fixing and driving device of the radiation relaxation device. The motion guide component drives it to the automatic screwing in and out of the bolt and gas exchange system 8, the box cover grasping component 7 and the stroke extension force measurement system respectively. Then, the radiation relaxation characteristics of the material itself can be detected by using the stress method principle. The maximum internal stress of the radiation relaxation sample 6.9 under a specific bending state is measured, that is, the material is made into a simple shape and structure. The irradiated relaxed sample 6.9 is made to form a physical model similar to a beam under a two-point supported and two-point pressed state, and then the shape and force of the model are quantitatively analyzed, thereby obtaining the maximum internal stress value of the irradiated relaxed sample 6.9 under different irradiation conditions, and finally obtaining the relaxation characteristics of the irradiated relaxed sample 6.9 under different irradiation conditions; this solves the problem that the current existing technology cannot only detect the irradiation relaxation characteristics of the material itself, and at the same time the irradiated relaxed sample 6.9 can be reused, and high accuracy, high repeatability and high stability are achieved, thereby realizing high-precision detection of irradiation relaxation characteristics.

[0060] The present invention improves the validity and accuracy of the measurement data by reasonably designing the irradiation relaxation detection solution. By controlling the movement stroke of the motor that controls the pressure measurement mechanism 3.5 to descend, the number of points collected by the pressure measurement system 3 is greatly increased during the state change of the irradiated relaxation sample 6.9 in the box body 6.3 from "two-point support and two-point downward pressure - two-point support and four-point downward pressure - new two-point support and two-point downward pressure", thereby improving the accuracy of data processing, and further improving the accuracy, repeatability and stability of measurement.

[0061] The present invention can realize the automatic exchange of internal gas by reasonably designing a one-dimensional stroke extension irradiation relaxation fully automatic detection device and method. The existing irradiation relaxation sample 6.9 detection structure needs to be placed in an inert gas environment as a whole, which wastes inert gas resources; the present measuring device, through the design of the vent bolt 6.8, only needs to place the irradiation relaxation sample inside the irradiation relaxation component 6 with a smaller space, and the irradiation relaxation component 6 is in an inert gas environment, which can ensure the stability of the chemical properties of the irradiation relaxation sample 6.9 when irradiated, and solves the problem that the existing technology cannot automate gas protection.

Claims

1. A two-dimensional stroke extension irradiation relaxation fully automatic detection device, comprising a vibration isolation stand (1), an X-axis motion guide rail assembly (2), a Y-axis motion guide rail assembly (9), a horizontal linear motion slider (5), a box cover grabbing assembly (7) and an automatic bolt screwing-in and screwing-out and gas exchange system (8); the vibration isolation stand (1) is composed of a high-flatness tabletop (1.1), a high-strength bracket (1.2) and a high-performance vibration isolator (1.3), the high-performance vibration isolator (1.3) is installed on the upper support of the high-strength bracket (1.2), and the high-flatness tabletop (1.1) is installed on the upper end of the high-performance vibration isolator (1.3); the characteristics are: An X-direction motion guide rail assembly (2) is fixedly mounted on a vibration isolation stand (1); a Y-direction motion guide rail assembly (9) can be mounted on the X-direction motion guide rail assembly (2) so as to reciprocate along the X-direction; a horizontal linear motion slider (5) can be mounted on the Y-direction motion guide rail assembly (9) so as to reciprocate along the Y-direction; a self-sealing irradiation relaxation assembly (6) is fixedly mounted on the horizontal linear motion slider (5); an irradiation relaxation sample (6.9) is mounted inside the irradiation relaxation assembly (6); a pressure measurement system (3) and a bracket (4) are fixedly mounted on the vibration isolation stand (1) in sequence; and a box cover grabbing assembly (7) and a bolt automatic screwing-in and screwing-out and gas exchange system (8) are mounted in sequence along the Y-direction on the same side of the bracket (4). The pressure measurement system (3), the box cover grasping assembly (7) and the automatic screwing in and out bolt and gas exchange system (8) are located above the self-sealing radiation relaxation assembly (6); the pressure measurement system (3) comprises a system frame (3.1), a precision linear motion slide rail (3.2), a mounting plate (3.3), a radiation shielding shell (3.4) and a pressure measurement mechanism (3.5); the precision linear motion slide rail (3.2) is mounted on the system frame (3.1) so as to be movable up and down in the vertical direction, the mounting plate (3.3) is fixed on the precision linear motion slide rail (3.2), the pressure measurement mechanism (3.5) and the radiation shielding shell (3.4) are mounted at the lower end of the mounting plate (3.3), and the radiation shielding shell (3.4) is mounted on the lower end of the mounting plate (3.3). The housing (3.4) is located on the outer side of the pressure measuring mechanism (3.5) to surround the pressure measuring mechanism (3.5); the pressure measuring mechanism (3.5) is composed of a flat seat plate (3.5.1), a precision tension spring (3.5.2), a vertical linear motion slider (3.5.3), a high-precision force sensor (3.5.4), a precision pressure head (3.5.5) and a guide control column (3.5.6); the flat seat plate (3.5.1) is fixedly mounted on the lower end of the mounting plate (3.3), the guide control columns (3.5.6) are symmetrically mounted on the lower end of the flat seat plate (3.5.1), and the vertical linear motion slider (3.5.3) is mounted on the guide plates (3.5.6) to be symmetrically arranged. A precision tension spring (3.5.2) is arranged between the bottom of the flat seat plate (3.5.1) and the top of the vertical linear motion slider (3.5.3) on the position between the control column (3.5.6), the upper end and the lower end of the precision tension spring (3.5.2) are fixedly connected to the flat seat plate (3.5.1) and the vertical linear motion slider (3.5.3) respectively, the vertical linear motion slider (3.5.3) is elastically suspended on the flat seat plate (3.5.1), a high-precision force sensor (3.5.4) is installed on the lower end surface of the vertical linear motion slider (3.5.3), and a precision pressure head (3.5.5) is installed on the lower end surface of the high-precision force sensor (3.5.4).

2. A two-dimensional stroke extension irradiation relaxation fully automatic detection method based on the two-dimensional stroke extension irradiation relaxation fully automatic detection device according to claim 1, characterized in that: The method steps are: Step 1, fix the irradiation relaxation component on the horizontal linear motion slider, and drive the irradiation relaxation component to move to the automatic screwing in and out of the bolts and the gas exchange system and the box cover grabbing component in sequence through the X-direction movement of the Y-direction motion guide rail component on the X-direction motion guide rail component and the Y-direction movement of the horizontal linear motion slider on the Y-direction motion guide rail component, and disassemble the irradiation relaxation component by the automatic screwing in and out of the bolts and the gas exchange system and the box cover grabbing component to expose the irradiation relaxation sample; Step 2: Through the Y-direction motion of the Y-direction motion guide assembly on the X-direction motion assembly and the Y-direction motion of the horizontal linear motion slider on the Y-direction motion guide assembly, the irradiation relaxation assembly is driven by the horizontal linear motion slider to move to the position of the pressure measurement system, and the relaxation of the irradiation relaxation sample in the irradiation relaxation assembly is measured according to the following method: A. The precision linear motion slide rail drives the pressure measuring mechanism to descend, and the precision pressure head gradually approaches the irradiated relaxation sample. At this time, the elongation of the precision tension spring caused by the hanging vertical linear motion slide is fixed. In this process, the displacement, force and stretching of the precision pressure head in the pressure measuring mechanism are analyzed; B. The precision linear motion slide rail drives the pressure measuring mechanism to continue to descend, and the precision pressure head makes virtual contact with the irradiated relaxed sample. The sample is about to change from a two-point support and two-point downward pressure state to a two-point support and four-point downward pressure state. The precision tension spring is about to retract and the elongation is about to decrease. In this process, the displacement, force and stretching of the precision pressure head and the precision tension spring are analyzed; C. The precision linear motion slide rail drives the pressure measuring mechanism to continue to descend. When the precision pressure head presses down on the irradiated relaxed sample, making the irradiated relaxed sample in a two-point support and four-point pressure state, the displacement, force and stretching of the precision pressure head and the precision tension spring are analyzed; D. The precision linear motion slide rail drives the pressure measuring mechanism to continue to descend. When the maximum internal stress of the irradiated relaxed sample does not exceed its yield strength, the descent of the pressure measuring mechanism is stopped. During this process, the irradiated relaxed sample changes from a two-point supported four-point pressed state to a new two-point supported two-point pressed state. The displacement, force and stretching of the precision pressure head and the precision tension spring are analyzed. E. The precision linear motion slide rail drives the pressure measuring mechanism to rise and return to the state before step A. During this process, the displacement, force and stretching of the precision pressure head and the precision tension spring are analyzed; F. According to the displacement, force and stretching of the precision pressure head, calculate the change of the internal stress of the irradiated relaxation sample, and calculate the maximum internal stress value when the irradiated relaxation sample changes from the two-point support and four-point downward pressure state to the new two-point support and two-point downward pressure state, so as to calculate the irradiation relaxation amount of the sample under different irradiation conditions; Step 3, driven by the X-direction motion guide rail assembly and the Y-direction motion guide rail assembly, the self-sealing irradiation relaxation assembly is driven by the horizontal linear motion slider to move to the automatic screw-in and screw-out of the bolts and the gas exchange system and the box cover grabbing assembly in sequence, and the irradiation relaxation assembly is reassembled by the automatic screw-in and screw-out of the bolts and the gas exchange system and the box cover grabbing assembly; Step 4: The horizontal linear motion slider drives the irradiation relaxation component to move to the position before step 1, and the irradiation relaxation component is removed from the horizontal linear motion slider to complete the stroke extension irradiation relaxation automatic detection of the irradiation relaxation sample.

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