Experimental device for X-ray CT in-situ force-thermal coupling experiment

Abstract

The invention provides an experimental device for an X-ray CT in-situ force and heat coupling experiment, and particularly belongs to the technical field of scientific instruments. Through the structural arrangement of the gas inlet, the gas channel and the gas outlets, gas can enter the gas channel from the gas inlet, flow along the gas channel and then be blown out from the gas outlets uniformly distributed in the inner wall of the shell, so that the gas can be uniformly heated by the spiral heating wire, and hot airflow enters the sample clamping space under the action of gas pressure to uniformly heat a sample; and hot air is finally discharged from the upper part, so that the unidirectional loading and heating conditions of the sample are realized. The device comprises a loading module and an atmosphere heating module, and further comprises a sample clamping module, an atmosphere heating module is arranged above the loading module, a sample clamping module is arranged above the atmosphere heating module, the loading module is driven by cooperation of a motor and a planetary gear reducer, the atmosphere heating module is composed of a heating wire and a heating wire frame, and the sample clamping module is of a slender cylindrical structure.

Description

Technical Field

[0001] The present invention relates to an experimental device for in-situ force-thermal coupling experiments of X-ray CT, and specifically belongs to the technical field of scientific instruments. Background Art

[0002] X-ray CT is an analytical instrument for non-destructively detecting the three-dimensional spatial structure inside materials at the sub-micron to millimeter scale. Combining X-ray CT with different material testing machines can in-situ non-destructively and dynamically observe the initiation and propagation processes of internal defects in materials under different stress states and temperatures, providing an experimental observation basis for studying and analyzing the failure behavior and mechanism of materials under service conditions and predicting the service life;

[0003] In addition to providing load and temperature conditions, the testing machine used in in-situ observation experiments also needs to meet special requirements of X-ray CT for the testing machine, such as the distance between the light source and the sample being as small as possible, the structure ensuring the penetration of X-rays, the weight being less than the load-bearing limit of the X-ray CT sample stage, and the spatial dimensions matching the X-ray CT optical path, etc. Summary of the Invention

[0004] The purpose of the present invention is to provide an experimental device for in-situ force-thermal coupling experiments of X-ray CT, so as to provide a testing machine for X-ray CT that provides unidirectional loading and heating conditions.

[0005] To solve the above technical problems, the technical solution adopted by the present invention is: the invention includes a loading module, an atmosphere heating module, and a specimen clamping module;

[0006] An atmosphere heating module is arranged above the loading module, and a specimen clamping module is arranged above the atmosphere heating module. The loading module is driven by a motor and a planetary gear reducer in cooperation. The atmosphere heating module consists of a heating wire and a heating wire frame. The specimen clamping module is arranged in a slender cylindrical structure.

[0007] Furthermore, the driving force is provided for the whole device through the loading module, unidirectional loading and heating conditions are provided for the specimen through the atmosphere heating module, and the specimen is stably clamped through the specimen clamping module.

[0008] The loading module includes a motor, a planetary gear reducer, a turbine, a worm, a load-bearing crossbeam, a lead screw, and a loading rod; the end of the output shaft of the motor is fixedly connected to the planetary gear reducer, the end of the output shaft of the planetary gear reducer is fixedly connected to the worm, the worm is connected to the turbines on both sides, a load-bearing crossbeam is arranged above the worm, the lead screw is fixedly installed inside the turbine, the lead screw is connected to the inside of the load-bearing crossbeam, and a load sensor and a loading rod are installed on the top surface of the load-bearing crossbeam

[0009] Furthermore, by adopting a planetary gear reduction system, the transmission efficiency is improved, the loss of motor torque due to friction can be effectively avoided, and the utilization rate of motor torque is increased; by adopting a worm and worm gear system, the structure has the advantages of a large reduction ratio, a small structure, and a compact space, which is conducive to the miniaturization of the entire structure; by adopting a single worm driving a double turbine structure, the worm is located in the middle of the two turbines at this time, making the structure compact; since the loading rod is located in the middle of the load-bearing crossbeam, the specimen is loaded under the drive of the load-bearing crossbeam.

[0010] The atmosphere heating module includes a hollow cylinder, fins, a loading rod, and low-thermal-conductivity ceramics; the heating wire frame is processed from a ceramic material with low thermal conductivity, and a hollow cylinder is installed in the middle position of the heating wire frame. Fins are fixedly installed at equal intervals on the outer side of the hollow cylinder. The fins are provided with spiral upward notches, and heating wires are inserted into the notches. A loading rod is arranged inside the hollow cylinder. There is a gap between the loading rod and the hollow cylinder, and the outside of the loading rod is coated with low-thermal-conductivity ceramics.

[0011] Furthermore, through the setting of the gap between the loading rod and the cylinder, the heating received by the loading rod is reduced. Through the low-thermal-conductivity ceramics coated on the outside of the loading rod, the heating effect of the heater on the loading rod is further reduced, so that the load sensor can be in the normal working temperature range.

[0012] The atmosphere heating module further includes a gas inlet, an air duct, and a gas outlet; a gas inlet is opened on the outside of the atmosphere heating module. One end of the gas inlet is connected to an air duct, and the other end of the air duct is connected to a gas outlet.

[0013] Furthermore, the gas enters the air duct from the gas inlet, flows along the air duct, and then is blown out evenly from the gas outlet on the inner wall of the shell. In this way, the gas can be evenly heated by the spiral heating wire. The hot air flow enters the specimen clamping space under the action of air pressure to evenly heat the specimen, and the hot air finally exits from the upper part.

[0014] The specimen clamping module includes a fixture, a specimen, and a support cylinder; the top of the loading rod is fixedly connected to the fixture. There are two fixtures, and a support cylinder is connected between the two fixtures. A specimen is arranged inside the support cylinder, and the two fixtures cooperate to complete the clamping of the specimen; the cross section of the support cylinder is arranged in a triangular, hexagonal, and arc structure.

[0015] Furthermore, through the structural setting of the support cylinder, the absorption of X-rays by the support cylinder during the CT experiment can be reduced, which is beneficial to improving the experimental efficiency and avoiding the generation of interference signals. And it can maintain a high load-bearing capacity.

[0016] The beneficial effects of the present invention are:

[0017] 1. Through the structural settings of the gas inlet, airway, and gas outlet, gas can enter the airway from the gas inlet, flow along the airway, and then be blown out evenly from the gas outlets distributed on the inner wall of the housing. In this way, the gas can be evenly heated by the spiral heating wire. The hot air flow enters the specimen clamping space under the action of air pressure to uniformly heat the specimen, and the hot air finally discharges from the upper part, thereby realizing the unidirectional loading and heating conditions for the specimen.

[0018] 2. By adopting a planetary gear reducer, the transmission efficiency is improved, the loss of motor torque due to friction can be effectively avoided, and the utilization rate of motor torque is increased; by adopting a worm and worm gear transmission structure, the structure has the advantages of a large reduction ratio, a small size, and a compact space, which is conducive to the miniaturization of the entire structure; by adopting a single worm driving a double turbine structure, the overall structure is compact.

[0019] 3. Through the structural setting with a gap between the loading rod and the cylinder, the heating received by the loading rod is reduced. Through the low - thermal - conductivity ceramic coated on the outside of the loading rod, the heating effect of the heater on the loading rod is further reduced, enabling the load sensor to be within the normal operating temperature range;

[0020] 4. Through the structural setting of the support cylinder with a hollow sandwich, high X - ray transmittance can be achieved while maintaining the strength of the support cylinder. Description of the Drawings

[0021] Figure 1 is a schematic diagram of the overall structure of the present invention;

[0022] Figure 2 is a three - dimensional structure schematic diagram of the planetary gear reducer of the present invention;

[0023] Figure 3 is a side - view structure schematic diagram of the load - bearing cross - beam of the present invention;

[0024] Figure 4 is a front - view structure schematic diagram of the lead screw of the present invention;

[0025] Figure 5 is a schematic diagram of the hollow cylinder structure of the present invention;

[0026] Figure 6 is a three - dimensional structure schematic diagram of the gas inlet of the present invention;

[0027] Figure 7 is a front - view structure schematic diagram of the fixture of the present invention;

[0028] Figure 8 is a schematic diagram of the triangular cross - section structure of the support cylinder of the present invention;

[0029] Figure 9 is a schematic diagram of the hexagonal cross - section structure of the support cylinder of the present invention;

[0030] Figure 10 It is a schematic diagram of the arc cross-section structure of the support cylinder of the present invention.

[0031] 1. Loading module; 2. Atmosphere heating module; 3. Specimen clamping module; 4. Motor; 5. Planetary gear reducer; 6. Turbine; 7. Worm; 8. Load-bearing crossbeam; 9. Lead screw; 10. Loading rod; 11. Gas inlet; 12. Air duct; 13. Gas outlet; 14. Hollow cylinder; 15. Fins; 16. Loading rod; 17. Low thermal conductivity ceramic; 18. Fixture; 19. Specimen; 20. Support cylinder. Specific embodiments

[0032] Next, the technical solutions in the embodiments will be described clearly and completely in conjunction with the attached Figures 1 - 10 drawings.

[0033] Specific embodiment 1: As Figures 1 - 4 shown, the overall device is composed of three parts: a loading module 1, an atmosphere heating module 2, and a specimen clamping module 3. Among them, the loading module 1 provides stable support and improved driving force for the overall device, the atmosphere heating module 2 realizes unidirectional loading and heating conditions for the specimen, and the specimen clamping module 3 completes the stable clamping of the specimen;

[0034] The loading module 1 is located at the lower part of the overall structure. The loading module 1 is composed of a planetary gear reducer 5 in cooperation with a turbine 6 and a worm 7. The output shaft end of the motor 4 is fixedly connected to the planetary gear reducer 5. By adopting a planetary gear reduction system, the transmission efficiency is improved, the loss of motor torque due to friction can be effectively avoided, and the utilization rate of motor torque is improved;

[0035] The output shaft end of the planetary gear reducer 5 is fixedly connected to a worm 7. The two sides of the worm 7 are connected with a turbine 6. By adopting a turbine-worm system, the structure has the advantages of a large reduction ratio, a small structure, and a compact space, which is beneficial to the miniaturization of the entire structure; at the same time, the worm 7 can drive the two turbines 6 to rotate. By adopting a single worm driving a double-turbine structure, the worm is located in the middle of the two turbines at this time, making the structure compact; a load-bearing crossbeam 8 is arranged above the worm 7, a lead screw 9 is fixedly installed inside the turbine 6, the lead screw 9 is connected to the inside of the load-bearing crossbeam 8, and a load sensor and a loading rod 10 are installed on the top surface of the load-bearing crossbeam 8; since the loading rod 10 is located in the middle of the load-bearing crossbeam 8, the specimen can be loaded under the drive of the load-bearing crossbeam 8.

[0036] Specific embodiment 2: As Figures 5 - 10As shown, a heating element composed of a helically wound heating wire and a heating wire holder is installed on the atmosphere heating module 2. The heating wire holder is made of a ceramic material with low thermal conductivity. A hollow cylinder 14 is installed at the middle position of the heating wire holder. Fins 15 are fixedly installed at equal intervals on the outer side of the hollow cylinder 14. The fins 15 are provided with helically rising notches, and the heating wire is inserted into the notches. A loading rod 16 is arranged inside the hollow cylinder 14. There is a gap between the loading rod 16 and the hollow cylinder 14. The outer side of the loading rod 16 is coated with a low thermal conductivity ceramic 17. By setting a gap between the loading rod 16 and the hollow cylinder 14, the heating received by the loading rod 16 is reduced. By providing the low thermal conductivity ceramic 17 coated on the outside of the loading rod 16, the heating effect of the heating element on the loading rod 16 is further reduced, so that the load sensor can be in the normal operating temperature range, which is beneficial to improving the safety of the device during use;

[0037] A gas inlet 11 is provided on the outside of the atmosphere heating module 2. One end of the gas inlet 11 is connected to an air duct 12, and the other end of the air duct 12 is connected to a gas outlet 13. Gas enters the air duct 12 from the gas inlet 11, flows along the air duct 12, and is blown out from the gas outlets 13 evenly distributed on the inner wall of the outer shell of the atmosphere heating module 2. In this way, the gas can be evenly heated by the helically arranged heating wire. The hot air flow enters the clamping space of the specimen 19 under the action of air pressure to uniformly heat the specimen 19, and the hot air finally discharges from the upper part. Through the processed gas flow channel, it is ensured that the gas is evenly input to the heating wire inside the heater, improving the heating efficiency, and at the same time realizing the rapid cooling of the outer shell. And the atmosphere heating module 2 can achieve heating from room temperature to 600 °C;

[0038] The specimen clamping module 3 is arranged in a slender cylindrical structure, which is beneficial for the X-ray source to approach the specimen to be tested, improving the resolution of the CT. The top of the loading rod 16 is fixedly connected to a fixture 18. There are two fixtures 18. A support cylinder 20 is connected between the two fixtures 18. The specimen 19 is arranged inside the support cylinder 20. The two fixtures 18 cooperate to complete the clamping of the specimen 19. The specimen 19 and the fixture 18 can adopt standard models or can be designed and replaced according to experimental needs. The support cylinder 20 bears the load received by the sample and transfers the load to the support column of the loading module 1. By setting the cross section of the support cylinder 20 as a triangle, a hexagon and an arc structure, as Figures 8 - 10 shown, this can reduce the absorption of X-rays by the support cylinder during the CT experiment, which is beneficial to improving the experimental efficiency and avoiding the generation of interference signals. And it can maintain a high load-bearing capacity.

[0039] The above are only the preferred embodiments of the present invention, and do not impose any form of limitation on the present invention. Although the present invention has been disclosed above with the preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art, without departing from the scope of the technical solution of the present invention, can make some changes or modifications to the above-disclosed technical content to obtain equivalent embodiments with equivalent changes. However, as long as it does not depart from the content of the technical solution of the present invention, and according to the technical essence of the present invention, any simple modifications, equivalent replacements, and improvements made to the above embodiments within the spirit and principles of the present invention still fall within the protection scope of the technical solution of the present invention.

Claims

1. An experimental device for in-situ X-ray CT force-thermal coupling experiments, characterized in that It includes a loading module (1), an atmosphere heating module (2), and a specimen clamping module (3); The atmosphere heating module (2) is arranged above the loading module (1), and the specimen clamping module (3) is arranged above the atmosphere heating module (2). The loading module (1) is driven by the cooperation of a motor (4) and a planetary gear reducer (5). The atmosphere heating module (2) consists of a heating wire and a heating wire frame. The specimen clamping module (3) is arranged in a slender cylindrical structure.

2. The experimental device for in-situ force-thermal coupling experiment of X-ray CT according to claim 1, characterized in that, The loading module (1) includes a motor (4), a planetary gear reducer (5), a turbine (6), a worm (7), a load-bearing crossbeam (8), a lead screw (9), and a loading rod (10); The end of the output shaft of the motor (4) is fixedly connected to the planetary gear reducer (5). The end of the output shaft of the planetary gear reducer (5) is fixedly connected to the worm (7). The two sides of the worm (7) are connected to the turbines (6). A load-bearing crossbeam (8) is arranged above the worm (7). The lead screw (9) is fixedly installed inside the turbine (6). The lead screw (9) is connected to the inside of the load-bearing crossbeam (8). A load sensor and a loading rod (10) are installed on the top surface of the load-bearing crossbeam (8).

3. The experimental device for in-situ force-thermal coupling experiment of X-ray CT according to claim 1, characterized in that, The atmosphere heating module (2) includes a hollow cylinder (14), fins (15), a loading rod (16), and a low thermal conductivity ceramic (17); The heating wire frame is processed from a ceramic material with low thermal conductivity. A hollow cylinder (14) is installed in the middle position of the heating wire frame. Fins (15) are fixedly installed at equal intervals on the outside of the hollow cylinder (14). A helically rising notch is opened on the fin (15), and a heating wire is inserted into the notch. A loading rod (16) is arranged inside the hollow cylinder (14). A gap is arranged between the loading rod (16) and the hollow cylinder (14). The outside of the loading rod (16) is coated with a low thermal conductivity ceramic (17).

4. An experimental device for in-situ force-thermal coupling experiments of X-ray CT, as claimed in claim 1, wherein, The atmosphere heating module (2) further includes a gas inlet (11), an air duct (12), and a gas outlet (13); A gas inlet (11) is opened on the outside of the atmosphere heating module (2). One end of the gas inlet (11) is communicated with an air duct (12), and the other end of the air duct (12) is communicated with a gas outlet (13).

5. An experimental device for in-situ force-thermal coupling experiment of X-ray CT, as claimed in claim 1, wherein, The specimen clamping module (3) includes a fixture (18), a specimen (19), and a support cylinder (20); The top end of the loading rod (16) is fixedly connected to the fixture (18). There are two fixtures (18). A support cylinder (20) is connected between the two fixtures (18). A specimen (19) is arranged inside the support cylinder (20). The two fixtures (18) cooperate to complete the clamping of the specimen (19).

6. The experimental device for in-situ force-thermal coupling experiment of X-ray CT according to claim 1, characterized in that, The cross-section of the support cylinder (20) is arranged in a triangular, hexagonal, and arc structure.

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