Electromagnetic type torsion actuation loading clamping device

Abstract

The clamping device comprises a U-shaped block, a groove is formed in the rear side of an inner cavity of the U-shaped block, a sliding plate is installed in the groove, the sliding plate slides back and forth in the groove to achieve clamping adjustment of to-be-tested pieces with different thicknesses and sizes, the left side and the right side of the sliding plate are connected with clamping blocks through bolts, and the left side and the right side of the sliding plate are connected with the clamping blocks through bolts. The first-stage clamping is realized by screwing the bolts on the left and right sides of the clamping block. The two sides of the U-shaped block are in threaded connection with hand wheels, top blocks are arranged at the front ends of the hand wheels, and when the hand wheels are screwed, the top blocks move forwards to extrude the sliding plate, and second-stage clamping of the to-be-tested piece is achieved. A flat key on the rear side of the exterior of the U-shaped block is connected with the rotor shaft, and the rotor shaft is driven by electromagnetic force to be accurately twisted by 1.8 degrees every time the electrifying sequence of the stator box winding is changed. According to the utility model, the guide sliding adjustment of test pieces with different thicknesses and sizes is realized, the integration of secondary clamping and electromagnetic drive torsion actuation of the experimental test piece is realized, the problems of infirm clamping and inaccurate torsion angle during test piece loading are solved, and the device has the advantages of convenience in operation, fastening in clamping, compact structure and high torsion precision.

Description

Technical Field

[0001] The utility model relates to the technical field of torsional test of material specimens, in particular to a clamping device for electromagnetic torsional actuation loading. Background Technique

[0002] When connecting specimens (such as composite laminates) to conduct tensile-torsional-shear load tests, it is necessary to simulate the small-angle torsional loading generated during the actual use of structural components. In a clamping device dedicated to a horizontal tensile-torsional-shear test platform with the patent application number 2023229838401, although it realizes the sliding adjustment and clamping fixation for specimens of different sizes and thicknesses, if torsional actuation is to be achieved, external forces (such as cylinder actuation) still need to be applied. Moreover, its L-shaped structure chuck uses threaded connection with the torsion bar, and during the torsional loading process, there is a relatively high risk of loosening at the threaded connection part during rotation, and it is extremely difficult to achieve high-precision torsional actuation (such as 3.6°) with cylinder and other torsional loading methods.

[0003] In existing torsional loading test equipment, most achieve torsional actuation through motors, cylinders, or hydraulics. The above three methods have problems such as heavy equipment, large space occupation, inconvenient disassembly, and difficult installation. Electromagnetic force has advantages such as fast loading speed, high precision, and large power. In a tensile-torsional drive device with electromagnetic force loading with the patent application number 2023210186425, it realizes the torsional actuation of electromagnetic force, but there are still problems such as difficult control of the torsional angle. Moreover, existing clamping devices also have problems such as loosening, slipping, and side deviation during clamping. If the electromagnetic force torsional loading is integrated into the design of the clamping device, while ensuring the clamping force, it will greatly improve the accuracy of the torsional angle of the specimen. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a clamping device for electromagnetic torsional actuation loading to solve the problems raised in the above background technique.

[0005] To achieve the above purpose, the utility model provides the following technical solutions: A clamping device for electromagnetic torsional actuation loading, including a U-shaped block. A groove is provided at the rear side of the inner cavity of the U-shaped block, and the convex block at the rear side of the sliding plate is fitted and installed in the groove. At one side in the middle of the U-shaped block and at the middle position of the sliding plate, there are the same cylindrical through holes. The corresponding guide posts are installed in the cylindrical through holes, and the guide posts are detachably connected to the U-shaped block by bolts. The front end of the sliding plate is detachably connected to a wedge block by bolts. The guide posts play a role of guiding and sliding when adjusting the clamping size.

[0006] As a preferred solution of the utility model, a pair of through holes are provided on the left and right opposite sides of the U-shaped block. A pair of hand wheels are detachably connected to the pair of through holes by threads. The front end of the hand wheel is threadedly connected to a top block. A pair of clamping blocks are detachably connected to the left and right sides of the sliding plate by bolts. The pair of clamping blocks and the top block are used to clamp the sliding plate, achieving the effect of secondary clamping.

[0007] As a preferred solution of the present utility model, a slot hole is provided at the rear side of the outside of the U-shaped block. The U-shaped block is connected to the rotor shaft in the slot hole through a flat key. When the rotor shaft is loaded, it drives the U-shaped block to twist and actuate.

[0008] As a preferred solution of the present utility model, a cylindrical hole is provided at one end of the rotor shaft where the rotor teeth are provided. The cylindrical support block provided in the middle of the rear box cover is correspondingly installed in the cylindrical hole of the rotor shaft, which is convenient for disassembly and assembly and realizes the function of supporting the rotor shaft.

[0009] As a preferred solution of the present utility model, the front end cover is provided with a cylindrical convex block, and the stator box is provided with a cylindrical hole corresponding to the convex block of the front end cover, which is convenient for disassembly and assembly and realizes the function of positioning and assembling.

[0010] As a preferred solution of the present utility model, a circular straight through hole is provided at the middle position of the front end cover. One end of the rotor shaft without rotor teeth is connected to the slot hole at the rear side of the outside of the U-shaped block through the circular straight through hole of the front end cover by a flat key, which is used for transmitting torque and realizing precise rotation.

[0011] As a preferred solution of the present utility model, the front end cover is detachably connected to the stator box by bolts, and the stator box is detachably connected to the rear box cover by bolts. Six bolt holes for connecting external equipment are provided at the rear side of the outside of the rear box cover, which are used for applying other external loads (such as tensile force and other types).

[0012] As a preferred solution of the present utility model, there are two convex blocks with the same length, width and height at the upper and lower positions at the rear side of the sliding plate. The convex blocks slide back and forth in the groove at the rear side of the inner cavity of the U-shaped block, realizing the adjustable clamping for specimens with different thicknesses.

[0013] As a preferred solution of the present utility model, a pin is provided at one end of the guide post away from the U-shaped block, which is convenient for disassembly and assembly.

[0014] As a preferred solution of the present utility model, a reticulate pattern is provided at one end of the wedge block close to the specimen to be tested, which is used for increasing the friction force for clamping the specimen.

[0015] As a preferred solution of the present utility model, the number of teeth set on the rotor shaft is 50, and the number of teeth set on the stator box is 48 (each group has 6 gears, and a total of 8 groups are set), and the distance between each group is 1.8°.

[0016] As a preferred solution of the present utility model, each coil is respectively wound around four stators (in a cross shape), and finally two coils are led out.

[0017] Compared with the prior art, the beneficial effects of the present utility model are:

[0018] In this utility model, a sliding plate is installed in the rear groove of the U-shaped block. The sliding plate slides back and forth in the groove to achieve the clamping adjustment of test pieces with different thickness dimensions. Clamping blocks are bolted to the left and right sides of the sliding plate, and tightening the bolts on the left and right sides of the clamping blocks realizes the first-level clamping. Handwheels are threadedly connected to both sides of the U-shaped block, and a top block is provided at the front end of the handwheel. When the handwheel is rotated, the top block moves forward to squeeze the sliding plate, realizing the second-level clamping of the test piece. The rear side of the outside of the U-shaped block is connected to the rotor shaft by a flat key. Each time the energization sequence of the stator box winding is changed, the electromagnetic force drives the rotor shaft to accurately twist and actuate by 1.8°. This utility model realizes the guiding and sliding adjustment for test pieces with different thickness dimensions, and at the same time realizes the integration of secondary clamping and electromagnetic-driven torsional actuation of the experimental test piece, solving the problems of insecure clamping during the loading of the test piece, inaccurate torsional angle, large space occupation and inconvenient operation of the traditional torsional test device, and has the advantages of simple operation, firm clamping, compact structure and high torsional accuracy. Description of the Drawings

[0019] Figure 1 It is a three-dimensional axonometric drawing of this utility model;

[0020] Figure 2 It is an exploded view of the U-shaped block, sliding plate, handwheel, etc. of this utility model;

[0021] Figure 3 It is a schematic diagram of the structure of the sliding plate of this utility model;

[0022] Figure 4 It is a schematic diagram of the sliding plate, handwheel, and top block of this utility model;

[0023] Figure 5 It is an exploded view of the U-shaped block, flat key, and rotor shaft of this utility model;

[0024] Figure 6 It is an exploded view of the rotor shaft, front end cover, and stator box of this utility model;

[0025] Figure 7 It is a wiring schematic diagram of the stator box of this utility model;

[0026] Figure 8 It is an assembled exploded view of the rotor shaft and the rear box cover of this utility model;

[0027] Figure 9 It is a schematic diagram of this utility model with the U-shaped block, sliding plate, handwheel, etc. removed;

[0028] Figure 10 It is an overall exploded view of this utility model;

[0029] Figure 11 It is a schematic diagram of clamping the test piece to be tested of this utility model.

[0030] Figure 7 For further illustration, in the figure, the magnetic poles of stators a and e are opposite, those of stators b and f are opposite, those of stators c and g are opposite, and those of stators d and h are opposite.

[0031] In the figure: A, top block; B, specimen to be tested; 1, U-shaped block; 2, sliding plate; 3, handwheel; 4, clamping block; 5, wedge block; 6, guiding column; 7, flat key; 8, rotor shaft; 9, front end cover; 10, stator box; 11, rear end cover. Specific implementation mode

[0032] For the embodiment, please refer to Figures 1 to 11 , the present utility model provides a technical solution: a clamping device for electromagnetic torsion actuation loading, including a U-shaped block 1. A groove is provided at the rear side of the inner cavity of the U-shaped block 1, and the convex block at the rear side of the sliding plate 2 is fitted and installed in the groove. Cylindrical through holes of the same size are provided at one side of the middle part of the U-shaped block 1 and at the middle position of the sliding plate 2, and corresponding guiding columns 6 are installed in the cylindrical through holes. The guiding columns 6 are detachably connected to the U-shaped block 1 by bolts. The front end of the sliding plate 2 is detachably connected to the wedge block 5 by bolts. A pair of through holes are provided on the left and right opposite sides of the U-shaped block 1, and a handwheel 3 is detachably connected to the pair of through holes by threads. The front end of the handwheel 3 is threadedly connected to the top block A. A pair of clamping blocks 4 are detachably connected to the left and right sides of the sliding plate 2 by bolts. A slot hole is provided at the rear side of the outside of the U-shaped block 1, and the U-shaped block 1 is connected to the rotor shaft 8 in the slot hole through a flat key 7. One end of the rotor shaft 8 provided with rotor teeth is provided with a cylindrical hole, and the cylindrical support block provided in the middle of the rear end cover 11 is correspondingly installed in the cylindrical hole of the rotor shaft 8. The front end cover 9 is provided with a cylindrical convex block, and the stator box 10 is provided with a cylindrical hole corresponding to the convex block of the front end cover 9. A circular straight through hole is provided at the middle position of the front end cover 9. One end of the rotor shaft 8 without rotor teeth is connected to the slot hole at the rear side of the outside of the U-shaped block 1 through the circular straight through hole of the front end cover 9 by a flat key 7. The front end cover 9 is detachably connected to the stator box 10 by bolts, the stator box 10 is detachably connected to the rear end cover 11 by bolts, and six bolt holes for connecting external devices are provided at the rear side of the outside of the rear end cover 11. There are two convex blocks with the same length, width and height at the upper and lower positions at the rear side of the sliding plate 2, and the convex blocks slide back and forth in the groove at the rear side of the inner cavity of the U-shaped block 1. A pin is provided at the end of the guiding column 6 far away from the U-shaped block 1, and a reticulation is provided at one end of the wedge block 5 close to the specimen to be tested B. Attached Figure 7 Among them, the magnetic poles of stators a and e are opposite, those of stators b and f are opposite, those of stators c and g are opposite, and those of stators d and h are opposite (the first coil is wound around stators aceg, and the second coil is wound around stators bdfh). The number of teeth provided on the rotor shaft 8 is 50, and the number of teeth provided on the stator box 10 is 48 (every 6 gears are in a group, and a total of 8 groups are provided). The spacing of each group is 1.8°. Each coil is wound around four stators (in a cross shape), and finally two coils are led out.

[0033] Working process of the utility model: The user manually adjusts the sliding plate 2 to slide in the groove at the rear side of the U-shaped block 1, so that the distance between a pair of sliding plates 2 becomes larger. Then, one end of the test piece B to be tested is placed between the wedge-shaped blocks 5 installed in the pair of sliding plates 2. After adjusting to the appropriate position, the user manually adjusts the sliding plate 2 to slide along the groove at the rear side of the U-shaped block 1 again, so that the distance between the pair of sliding plates 2 continuously decreases until it closely fits the test piece B to be tested. After the clamping position is determined, the bolts arranged above the clamping blocks 4 on the left and right sides of the sliding plate 2 are tightened to complete the first-stage clamping. The hand wheels 3 at both ends of the U-shaped block 1 are rotated, and the spiral movement of the hand wheels 3 drives the top block A at their front ends to squeeze the sliding plate 2 to complete the second-stage clamping. The rotor teeth provided on the rotor shaft 8 are S poles. After the second-stage clamping is completed, the first coil is energized in the positive direction. The stators a and e in the stator box 10 are N poles, attracting the rotor shaft 8 to rotate by 1.8°. When the second coil is energized in the positive direction, the stators b and f are N poles, attracting the rotor shaft 8 to rotate by 1.8°. When the first coil is energized in the reverse direction, the stators c and g are N poles, attracting the rotor shaft 8 to rotate by 1.8°. When the second coil is energized in the reverse direction, the stators d and h are N poles, attracting the rotor shaft 8 to rotate by 1.8°. These four steps form a cycle, completing the clamping and torsion actuation of the test piece B to be tested by 7.2°. After the above steps are completed, mechanical tests such as tension, torsion, and shear can be carried out under load.

[0034] Although the embodiments of the present utility model have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present utility model. The scope of the present utility model is defined by the appended claims and their equivalents.

Claims

1. An electromagnetic torsional actuation loading clamping device, comprising a U-shaped block (1), characterized in that: The U-shaped block (1) has a groove at the rear side of the inner cavity, and the groove cooperates with the protrusion on the rear side of the sliding plate (2) to install. The U-shaped block (1) and the sliding plate (2) have the same cylindrical through hole at one side of the middle part, and the cylindrical through hole is installed with a corresponding guide column (6). The guide column (6) is detachably connected to the U-shaped block (1) by bolts. The front end of the sliding plate (2) is detachably connected to the wedge block (5) by bolts. The U-shaped block (1) has a pair of through holes at the left and right opposite sides, and the pair of through holes is detachably connected to the hand wheel (3) by threads. The front end of the hand wheel (3) is threadedly connected to the top block (A). The left and right sides of the sliding plate (2) are detachably connected to a pair of clamping blocks (4) by bolts. The U-shaped block (1) has a slotted hole at the rear side of its exterior, and the U-shaped block (1) is fixed in the slotted hole by a flat key (7). The rotor shaft (8) is connected, one end of the rotor shaft (8) provided with rotor teeth is provided with a cylindrical hole, a cylindrical support block provided in the middle of the rear box cover (11) is mounted correspondingly to the cylindrical hole of the rotor shaft (8), the front end cover (9) is provided with a cylindrical protrusion, the stator box (10) is provided with a cylindrical hole corresponding to the protrusion of the front end cover (9), a circular straight-through hole is provided in the middle of the front end cover (9), the end of the rotor shaft (8) not provided with rotor teeth is connected to the slotted hole on the rear side of the U-shaped block (1) through the circular straight-through hole flat key (7) of the front end cover (9), the front end cover (9) is detachably connected to the stator box (10) by bolts, the stator box (10) is detachably connected to the rear box cover (11) by bolts, and the rear side of the rear box cover (11) is provided with 6 bolt holes for connecting external equipment.

2. The electromagnetic torsional actuation loading clamping device according to claim 1, characterized in that: The rear side of the sliding plate (2) is provided with two upper and lower protrusions of the same length, width and height, and the protrusions slide back and forth in the grooves on the rear side of the inner cavity of the U-shaped block (1).

3. The electromagnetic torsion-actuated clamping device according to claim 1, characterized in that: A latch is provided at one end of the guide column (6) away from the U-shaped block (1).

4. The electromagnetic torsional actuation loading clamping device according to claim 1, characterized in that: The end of the wedge-shaped block (5) close to the test piece (B) is provided with a mesh pattern.

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