In-situ torsion experiment device for X-ray CT (Computed Tomography)

Abstract

The utility model relates to an in-situ torsion experiment device for X-ray CT (Computed Tomography), and belongs to the technical field of scientific instruments for in-situ torsion experiments for X-ray CT. Comprising a driving assembly, a torque sensor and a clamp assembly. Two ends of a shaft of the torque sensor are respectively connected with the driving assembly and a clamp. The driving assembly comprises a motor, an outer shell, a worm gear and a worm, the worm gear and the worm are rotationally arranged in the outer shell and meshed, the upper end of the worm gear is in key connection with the lower end of the torque sensor, and one end of the worm is connected with the output end of the motor. The driving assembly is stable in transmission during an experiment, has a self-locking function, prevents reverse rotation, improves the detection accuracy, is compact in structure, has a large transmission ratio, is suitable for speed reduction, is low in noise and small in vibration, and effectively prevents the influence on other works in a laboratory.

Description

Technical Field

[0001] This utility model relates to a torsion experiment device, belonging to the technical field of scientific instruments for in-situ torsion experiments in X-ray CT. Background Technology

[0002] X-ray computed tomography (XCT) is an analytical instrument used for non-destructive testing of the submicron to millimeter-scale 3D spatial structure of materials. Combining X-ray CT with various material mechanics testing machines allows for in-situ, non-destructive, and dynamic observation of the initiation and propagation processes of internal defects in materials under different stress states and temperatures. This provides an experimental observational basis for studying and analyzing the failure behavior and mechanisms of materials under service conditions and predicting their service life. Torsion is a common deformation and stress state. Observing the failure behavior and processes of materials under torsional deformation and stress states is of great significance for material optimization, torsional structural design, and component life prediction. For example, the utility model invention with publication number CN212379203U, entitled "A Torsion Testing Device for High-Strength Composite Material Pipes," discloses a device that uses a pipe with both ends located on two frames to undergo torsion, thereby conducting a torsion test. This device has good clamping effect, is convenient to install, and can prevent the pipe from being damaged while ensuring clamping force, thus providing convenience for personnel and improving the testing rate. However, its transmission device uses a connection of drive equipment, drive gear, driven gear, drive rod and right frame, which has poor transmission stability and is prone to reverse rotation, thus affecting the accuracy of detection.

[0003] Therefore, there is an urgent need to develop a device for in-situ torsion experiments in X-ray CT to solve the above-mentioned technical problems. Utility Model Content

[0004] To address the aforementioned problems, an apparatus for in-situ torsion experiments in X-ray CT is provided. A brief overview of this invention is given below to provide a basic understanding of certain aspects of the invention. It should be understood that this overview is not an exhaustive summary of the invention. It is not intended to identify key or essential parts of the invention, nor is it intended to limit the scope of the invention.

[0005] The technical solution of this utility model:

[0006] An in-situ torsion test apparatus for X-ray CT includes a drive assembly, a torque sensor, and a clamp assembly. The two ends of the shaft of the torque sensor are connected to the drive assembly and the clamp assembly, respectively. The drive assembly includes a motor, a housing, a worm gear, and a worm. The worm gear and worm are rotatably mounted in the housing, and the worm gear meshes with the worm. The upper end of the worm gear is keyed to the lower end of the torque sensor, and one end of the worm is connected to the output end of the motor.

[0007] Preferably, the motor is a stepper motor.

[0008] Preferably, the drive assembly further includes a drive gear, a chain, and a driven gear. The drive gear is keyed to the output end of the motor, the drive gear is connected to the driven gear via the chain, and the driven gear is keyed to one end of the worm gear extending out of the housing.

[0009] Preferably, it also includes a mounting bracket, the lower end of which is connected to the upper end of the housing, the lower part of which is connected to the housing of the torque sensor, and the mounting bracket is installed with the clamp assembly.

[0010] Preferably, the clamp assembly includes an upper clamp, a lower clamp, a baffle, and a sleeve. The upper end of the torque sensor is keyed to the lower part of the lower clamp. The upper part of the lower clamp has an upper mounting groove. The lower end of the sample is set in the mounting groove. The baffle is set on the side of the mounting groove. The baffle is detachably connected to the lower clamp, so that the lower end of the sample is clamped and fixed. The sleeve is fitted on the outside of the sample. The two ends of the sleeve are respectively connected to the upper clamp and the mounting bracket. The upper clamp has a mounting through hole machined in the middle. The upper end of the sample is inserted into the mounting through hole and fixed.

[0011] Preferably, the sleeve is made of transparent material.

[0012] Preferably, the clamping assembly also includes screws, the upper part of the lower clamp is located on the outside of the mounting bracket, the two sides of the baffle are machined with symmetrically arranged through holes, the side of the lower clamp is provided with two symmetrically arranged threaded holes, the threaded holes are located on both sides of the mounting groove, the through holes of the baffle and the threaded holes of the lower clamp are arranged one-to-one, and the screw passes through the through hole of the baffle and is threadedly connected to the corresponding threaded hole of the lower clamp.

[0013] Preferably, the upper end of the mounting bracket has an upper protrusion evenly arranged in the circumferential direction, the lower end of the upper clamp has a lower protrusion evenly arranged in the circumferential direction, and the two ends of the sleeve are respectively machined with an upper groove and a lower groove. The lower protrusion is inserted into the corresponding upper groove, and the upper protrusion is inserted into the corresponding lower groove.

[0014] Preferably, the upper groove and the lower groove are arranged in an alternating pattern.

[0015] This utility model has the following beneficial effects:

[0016] The drive component of this invention provides smooth transmission during testing, has a self-locking function to prevent reverse rotation, improves testing accuracy, has a compact structure, and has a large transmission ratio, making it suitable for deceleration. At the same time, it has low noise and low vibration, effectively preventing the impact on other work in the laboratory.

[0017] The fixture of this invention is directly connected to the sensor, and with the smooth transmission drive structure, the accuracy of detection is greatly improved.

[0018] The sleeve of this invention is unobstructed in all directions, which makes it easy to set up a light source and minimizes the distance between the light source and the sample. At the same time, the transparent sleeve ensures the penetration of X-rays. Attached Figure Description

[0019] Figure 1 A three-dimensional diagram of an in-situ torsion test apparatus for X-ray CT.

[0020] Figure 2 A side view of an in-situ torsion test apparatus for X-ray CT.

[0021] Figure 3 for Figure 2 Sectional view of AA;

[0022] Figure 4 This is a partial schematic diagram of an in-situ torsion test apparatus for X-ray CT.

[0023] Figure 5 This is a partial exploded view of an in-situ torsion experimental setup for X-ray CT.

[0024] In the figure, 1-drive assembly, 2-torque sensor, 3-mounting bracket, 4-sample, 5-clamp assembly, 11-motor, 12-drive gear, 13-chain, 14-driven gear, 15-outer shell, 16-worm gear, 17-worm, 31-upper protrusion, 51-upper clamp, 52-lower clamp, 53-baffle, 54-sleeve, 55-screw, 511-mounting through hole, 512-lower protrusion, 541-lower groove, 542-upper groove. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model is described below with reference to specific embodiments shown in the accompanying drawings. However, it should be understood that these descriptions are merely exemplary and not intended to limit the scope of the present utility model. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concept of the present utility model.

[0026] Specific implementation method one: Combining Figure 1-5This embodiment describes an in-situ torsion test apparatus for X-ray CT, comprising a drive assembly 1, a torque sensor 2, and a clamp assembly 5. The two ends of the torque sensor 2 are connected to the drive assembly 1 and the clamp assembly 5, respectively. The drive assembly 1 includes a motor 11, a housing 15, a worm gear 16, and a worm 17. The worm gear 16 and worm 17 are rotatably disposed within the housing 15, meshing with each other. The two ends of the vertically oriented worm gear 16 are rotatably connected to the housing 15 via bearings, and the two ends of the horizontally oriented worm 17 are rotatably connected to the housing 15 via bearings. The upper end of the worm gear 16 is keyed to the lower end of the torque sensor 2, and one end of the worm 17 is connected to the output end of the motor 11 outside the housing 15. This design ensures smooth transmission during the experiment, provides a self-locking function to prevent reverse rotation, improves detection accuracy, has a compact structure, a large transmission ratio suitable for deceleration, and exhibits low noise and vibration, effectively preventing interference with other work in the laboratory.

[0027] The motor 11 is a stepper motor;

[0028] The drive assembly 1 also includes a drive gear 12, a chain 13 and a driven gear 14. The drive gear 12 is keyed to the output end of the motor 11. The drive gear 12 is connected to the driven gear 14 through the chain 13. The driven gear 14 is keyed to one end of the worm gear 17 that extends out of the housing 15.

[0029] It also includes a mounting bracket 3, the lower end of which is bolted to the upper end of the housing 15, the lower part of which is bolted to the housing of the torque sensor 2, and the upper part of which is installed with the clamp assembly 5.

[0030] The clamp assembly 5 includes an upper clamp 51, a lower clamp 52, a baffle 53, and a sleeve 54. The upper end of the torque sensor 2 is inserted into the lower mounting hole 522 of the lower clamp 52. The upper end of the torque sensor 2 is keyed to the lower part of the lower clamp 52. The upper part of the lower clamp 52 is semi-circular and has an upper mounting groove 521. The lower end of the sample 4 is placed in the mounting groove 521. The baffle 53 is placed on the side of the mounting groove 521 and is detachably connected to the lower clamp 52, so that the lower end of the sample 4 is clamped and fixed. The sleeve 54 is fitted on the outside of the sample 4. The two ends of the sleeve 54 are respectively connected to the upper clamp 51 and the mounting bracket 3. The upper clamp 51 has a mounting through hole 511 machined in the middle. The mounting through hole 511 is a square through hole. The upper end of the sample 4 is inserted into the mounting through hole 51 for fixed connection, which can accommodate samples 4 of different lengths and reduce the accuracy requirements of the axial length of the sample 4. The mounting through hole 511, the baffle 53 and the lower clamp 52 form a mounting groove 521, which is square, and the mounting through hole 511 and the mounting groove 521 are axially corresponding. When the sample 4 is circular, both ends of the sample 4 need to be inserted into the circular countersunk holes of the square mounting block. The shape of the square mounting block is set to correspond to the mounting through hole 511 and the mounting groove 521. The inner diameter of the circular countersunk hole of the square mounting block corresponds to the outer diameter of the sample 4. Different circular countersunk holes of square mounting blocks can be selected for different outer diameters. The clamp of this utility model is directly connected to the sensor, and with the smooth transmission drive structure, the accuracy of detection is greatly improved.

[0031] The sleeve 54 is made of high-strength materials such as transparent ceramic, polycarbonate, or acrylic. This invention is suitable for in-situ observation experiments. In addition to providing environmental conditions such as load (torsion), this invention also meets the special requirements of X-ray CT for the experimental machine. The sleeve 54 of this invention is unobstructed in the circumference, which facilitates the setting of the light source and minimizes the distance between the light source and the sample. At the same time, the transparent sleeve 54 ensures the penetration of X-rays. Through the structural design of this invention, the structure is simplified, the weight is light (less than the load-bearing limit of the X-ray CT sample stage), and the spatial dimensions are matched with the X-ray CT optical path.

[0032] The clamp assembly 5 also includes screws 55. The upper part of the mounting frame 3 has a cylindrical structure. The lower part of the lower clamp 52 is located on the inner side of the upper part of the mounting frame 3. The outer wall of the lower clamp 52 and the inner wall of the upper part of the mounting frame 3 have a gap to prevent external interference during rotation and affect the test results. The upper part of the lower clamp 52 is located on the outer side of the mounting frame 3 for easy operation and convenient disassembly and installation. The baffle 53 has symmetrically arranged through holes on both sides. The lower clamp 52 has two symmetrically arranged threaded holes on its side. The threaded holes are located on both sides of the mounting groove 521. The through holes of the baffle 53 and the threaded holes of the lower clamp 52 are arranged one-to-one. The screws 55 pass through the through holes of the baffle 53 and are threadedly connected to the corresponding threaded holes of the lower clamp 52.

[0033] The upper end of the mounting bracket 3 has several upper protrusions 31 evenly arranged in the circumferential direction, and the lower end of the upper clamp 51 has several lower protrusions 512 evenly arranged in the circumferential direction. The two ends of the sleeve 54 are respectively machined with upper grooves 542 and lower grooves 541. The lower protrusions 512 are inserted into the corresponding upper grooves 542, and the upper protrusions 31 are inserted into the corresponding lower grooves 541. The upper protrusions 31 and lower protrusions 512 are square, and the lower grooves 541 and upper grooves 542 are square corresponding to the protrusions.

[0034] The upper groove 542 and the lower groove 541 are intersecting when viewed from above, which improves the strength of the sleeve 54. In operation, the sample 4 is first inserted radially or axially into the mounting groove 521. Then, a baffle 53 is used to block the radial opening of the mounting groove 521. The baffle 53 and the lower clamp 52 are connected by screws 55 to clamp the lower end of the sample 4. The sleeve 54 is then fitted axially onto the outside of the sample 4, with the upper protrusion 31 inserted into the lower groove 541 of the sleeve 54, and the lower protrusion 512 of the upper clamp 51 inserted into the upper groove 542 of the sleeve 54. Simultaneously, the upper part of the sample 4 is inserted into the mounting through hole 511. After the sample is installed, the motor 11 is started. The driving force of the motor 11 is transmitted sequentially through the driving gear 12, chain 13, driven gear 14, worm 17, and worm wheel 16 to the torque sensor 2. The torque sensor 2 can be the AT613 dynamic torque sensor from Aikelai. The two ends of the torque sensor 2 are fixedly connected to the worm wheel 16 and the lower clamp 52, respectively. At this time, the lower clamp 52 applies force to the sample 4. The mounting frame 3 is fixedly connected to the outer shell 15. The sleeve 54 is fixed in relative position to the mounting frame 3 and the upper clamp 51, so that the upper end of the sample 4 is fixed in relative position to the upper clamp 51, thereby applying torsion to the sample 4.

[0035] It should be noted that in the above embodiments, as long as the technical solutions are not contradictory, they can be arranged and combined. Those skilled in the art can exhaust all possibilities based on the mathematical knowledge of permutation and combination. Therefore, this utility model will not describe the technical solutions after permutation and combination one by one, but it should be understood that the technical solutions after permutation and combination have been disclosed by this utility model.

[0036] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A device for in-situ torsion experiments in X-ray CT, characterized in that: The device includes a drive assembly (1), a torque sensor (2), and a clamp assembly (5). The two ends of the torque sensor (2) are connected to the drive assembly (1) and the clamp assembly (5), respectively. The drive assembly (1) includes a motor (11), a housing (15), a worm gear (16), and a worm (17). The worm gear (16) and the worm (17) are rotatably disposed inside the housing (15). The worm gear (16) meshes with the worm (17). The upper end of the worm gear (16) is keyed to the lower end of the torque sensor (2), and one end of the worm (17) is connected to the output end of the motor (11).

2. The apparatus for in-situ torsion experiment in X-ray CT according to claim 1, characterized in that: The motor (11) is a stepper motor.

3. A device for in-situ torsion experiment in X-ray CT according to claim 1 or 2, characterized in that: The drive assembly (1) also includes a drive gear (12), a chain (13) and a driven gear (14). The drive gear (12) is keyed to the output end of the motor (11). The drive gear (12) is connected to the driven gear (14) through the chain (13). The driven gear (14) is keyed to one end of the worm gear (17) that extends out of the outer casing (15).

4. A device for in-situ torsion experiment in X-ray CT according to claim 1 or 2, characterized in that: It also includes a mounting bracket (3), the lower end of which is connected to the upper end of the housing (15), the mounting bracket (3) is connected to the housing of the torque sensor (2), and the mounting bracket (3) is installed with the clamp assembly (5).

5. The apparatus for in-situ torsion experiment in X-ray CT according to claim 4, characterized in that: The clamp assembly (5) includes an upper clamp (51), a lower clamp (52), a baffle (53), and a sleeve (54). The upper end of the torque sensor (2) is connected to the lower part of the lower clamp (52). The upper part of the lower clamp (52) has an upper mounting groove (521). The lower end of the sample (4) is set in the mounting groove (521). The baffle (53) is set on the side of the mounting groove (521). The baffle (53) is detachably connected to the lower clamp (52). The lower end of the sample (4) is clamped and fixed. The sleeve (54) is fitted on the outside of the sample (4). The two ends of the sleeve (54) are respectively connected to the upper clamp (51) and the mounting bracket (3). The middle part of the upper clamp (51) is machined with a mounting through hole (511). The upper end of the sample (4) is inserted into the mounting through hole (511).

6. The apparatus for in-situ torsion experiment in X-ray CT according to claim 5, characterized in that: The sleeve (54) is made of transparent material.

7. The apparatus for in-situ torsion experiment in X-ray CT according to claim 5, characterized in that: The clamp assembly (5) also includes screws (55). The upper part of the lower clamp (52) is located on the outside of the mounting bracket (3). The baffle (53) has symmetrically arranged through holes on both sides. The side of the lower clamp (52) has two symmetrically arranged threaded holes. The threaded holes are located on both sides of the mounting groove (521). The through holes of the baffle (53) and the threaded holes of the lower clamp (52) are arranged one-to-one. The screws (55) pass through the through holes of the baffle (53) and are threadedly connected to the corresponding threaded holes of the lower clamp (52).

8. The apparatus for in-situ torsion experiment in X-ray CT according to claim 5, characterized in that: The upper end of the mounting bracket (3) has an upper protrusion (31) evenly arranged in the circumference, and the lower end of the upper clamp (51) has a lower protrusion (512) evenly arranged in the circumference. The two ends of the sleeve (54) are respectively machined with an upper groove (542) and a lower groove (541). The lower protrusion (512) is inserted into the corresponding upper groove (542), and the upper protrusion (31) is inserted into the corresponding lower groove (541).

9. The apparatus for in-situ torsion experiment in X-ray CT according to claim 8, characterized in that: The upper groove (542) and the lower groove (541) are arranged in an intersecting manner.

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