CN204405428U - A kind of Sample location assembly of dynamic thermomechanical analysis apparatus double cantilever beam fixture - Google Patents

Abstract

For the existing double cantilever beam fixture of the dynamic thermomechanical analyzer (DMA), it is difficult to locate the sample accurately, resulting in large errors in test results and poor data reproducibility. Provides a sample positioning assembly for the double cantilever beam fixture of a dynamic thermomechanical analyzer. On the basis of the existing double cantilever beam fixture, a sample positioning assembly is designed and installed, which consists of a knurled fastening screw, a positioning ruler, a positioning guide column and Composition of positioning and fixing pieces: the guide groove on the positioning ruler cooperates with the guiding surface of the guide column to realize the movement of the positioning ruler perpendicular to the length of the sample; according to the width of the sample, set the scale on the positioning ruler to align with the scale groove on the positioning guide column position to achieve accurate positioning of the sample. The sample positioning component is used: the sample has good neutrality and does not affect the test result; the installation of the positioning component does not destroy the original structure of the fixture, the composition is simple, and it is easy to operate; the error of the test result is small, and the data reproducibility is good. It is suitable for use in various material testing laboratories.

Description

A sample positioning component of a double cantilever beam fixture for a dynamic thermomechanical analyzer

technical field

The utility model relates to a dynamic thermomechanical analyzer (DMA), mainly to a double cantilever beam fixture of this type of instrument, in particular to a sample positioning component of a dynamic thermomechanical analyzer double cantilever beam fixture.

Background technique

Dynamic Thermomechanical Analyzer (DMA) is mainly used to test the dynamic viscoelasticity of materials, and can obtain the dynamic modulus and loss factor of materials, thus reflecting the stiffness and damping of materials. The dynamic thermomechanical analyzer (DMA) can perform experimental scanning modes such as temperature, frequency, and strain. The deformation modes of the sample include double cantilever beam bending, three-point bending, tension, compression, and shear. In the double cantilever beam bending mode, the double cantilever beam fixture used includes a fixed part and a movable part. There is a compression grip at each end of the fixed part, and the movable part is located in the middle of the two fixed compression grips and has a compression grip. Grasp. According to the test principle and specification requirements, when the test strip sample is installed, it must pass through the three clamping grips and keep it perpendicular to them, and at the same time the sample is kept in the middle of each clamping grip, so that the test results obtained It is accurate, reliable and has good reproducibility. Since the total length of the strip-shaped sample used in this instrument is up to 60mm, it is difficult to keep the sample perpendicular to the three grippers and in the middle of the grippers by visual inspection when the sample is installed, resulting in large test results. error, the reproducibility of test results cannot be guaranteed.

Contents of the invention

In view of the shortcomings of the existing double cantilever beam fixture of the dynamic thermomechanical analyzer: it is difficult to accurately position the sample, resulting in large errors in test results and poor data reproducibility. On the basis of the existing double cantilever beam fixture, a sample positioning component is designed and installed, which can realize accurate positioning of the sample without affecting the test process, and solves the problem of poor reproducibility of double cantilever beam bending test data.

The technical scheme adopted by the utility model to solve the technical problem is: a sample positioning assembly of a double cantilever beam fixture of a dynamic thermomechanical analyzer, which consists of two knurled fastening screws (41), two positioning rulers (42), Two positioning guide pillars (43) and a positioning fixing piece (44) are formed, and the positioning guiding column (43) is fixed in the fixing screw hole (71) of the positioning fixing piece (44) by threads, and the guide on the positioning ruler (42) The groove (53) cooperates with the guide surface (62) of the guide column (43), and the knurled fastening screw (41) compresses the positioning ruler (42) through the fastening screw hole (73) of the positioning and fixing piece (44), Different scales (52) on the positioning ruler (42) are aligned with the scale grooves (61) on the positioning guide column (43) to determine different placement positions of the samples.

The beneficial effects of the utility model are: after adopting the sample positioning assembly, the two sets of positioning rulers (42) and the positioning guide column (43) can accurately limit the position of the sample, and the neutrality of the sample is good; after the sample is positioned, the positioning ruler (42) The evacuation of the positioning position does not affect the test results; the installation of the positioning components does not destroy the original structure of the fixture, the composition is simple, and it is easy to operate; due to the accurate positioning of the sample, the error of the test results is small and the reproducibility of the data is good.

Description of drawings

Fig. 1 is a schematic diagram of the assembly of the sample positioning component of a double cantilever beam fixture of a dynamic thermomechanical analyzer of the present invention.

FIG. 2 is an assembled and exploded schematic view of FIG. 1 .

Fig. 3 is an assembly diagram of the fixing fixture assembly (2) in Fig. 2 .

Fig. 4 is a schematic diagram of assembly of the movable clamp assembly (3) in Fig. 2 .

Fig. 5 is a schematic diagram of the assembly of the positioning component (4) in Fig. 2 .

FIG. 6 is an assembled and exploded schematic view of FIG. 5 .

Fig. 7 is a schematic diagram of the positioning ruler (42) in Fig. 6 .

Fig. 8 is a schematic diagram of the positioning guide column (43) in Fig. 6 .

Fig. 9 is a schematic diagram of the positioning and fixing piece (44) in Fig. 6 .

In the figure: 1. Base, 2. Fixed fixture assembly, 3. Movable fixture assembly, 4. Positioning assembly, 5. Sample, 11. Drive shaft, 12. Support column, 13. Trapezoidal groove connection block, 21. Fixed fixture seat , 22. Inner hexagonal fixing screw, 23. Movable compression grip, 24. Inner hexagonal compression screw, 25. Fixed through hole, 31. Movable clamp connector, 32. Inner hexagonal top wire, 41. Knurled fastening screw , 42. positioning ruler, 43. positioning guide column, 44. positioning fixed piece, 51. positioning head, 52. scale, 53. guide groove, 61. scale groove, 62. guide surface, 71. fixing screw hole, 72 .Fixing through hole, 73. Fastening screw hole

Detailed ways

With reference to accompanying drawing 1, accompanying drawing 2, accompanying drawing 3 and accompanying drawing 4, the dynamic thermomechanical analyzer double cantilever beam fixture with sample positioning assembly comprises base (1), fixed fixture assembly (2), movable fixture assembly ( 3) and the four parts of the positioning component (4), first place the fixing fixture component (2) on the support column (12) of the base (1), and then do not install the two hexagon socket set screws at the positioning component (4) (22) Insert the fixing through hole (25) of the fixing fixture seat (21) to correspond to the threaded holes on the two support columns (12), and then insert the two hexagon socket set screws (22) into the positioning component (4) The fixing through hole (72) of the positioning fixture (44) and the fixing through hole (25) of the fixing fixture seat (21) are fixed with the corresponding support column (12), and the fixing fixture assembly (2) and the positioning assembly (4) are completed. ) Two-part installation. Insert and connect the movable fixture connector (31) in the movable fixture assembly (3) with the trapezoidal groove connection block (13) of the base, and lock the two through the inner hexagon screw (32).

With reference to accompanying drawing 5, accompanying drawing 6, accompanying drawing 7, accompanying drawing 8 and accompanying drawing 9, a kind of sample positioning assembly of double cantilever beam fixture of dynamic thermomechanical analyzer, consists of two knurled fastening screws (41), two A positioning ruler (42), two positioning guide columns (43) and a positioning fixing piece (44) are formed, and the positioning guiding column (43) is fixed in the fixing screw hole (71) of the positioning fixing piece (44) by threads, and the positioning The guide groove (53) on the ruler (42) cooperates with the guide surface (62) of the guide column (43), and the knurled fastening screw (41) passes the positioning ruler (42) through the fastening screw of the positioning and fixing piece (44). The holes (73) are pressed tightly, and the different scales (52) on the positioning ruler (42) are aligned with the scale grooves (61) on the positioning guide column (43) to determine different placement positions of the samples.

With reference to accompanying drawing 7, positioning ruler (42) comprises positioning head (51), scale (52) and guide groove (53) three parts, the thickness of positioning head (51) is 5mm, and the precision of scale (52) is 0.5mm.

With reference to accompanying drawing 8, positioning guide post (43) comprises screw thread, scale groove (61) and guide surface (62), and the size between two guide surfaces is identical with the width of guide groove (53) in positioning ruler (42).

With reference to accompanying drawing 9, comprise two groups of fixing screw holes (71), fixing through hole (72) and fastening screw hole (73) on the positioning and fixing sheet (44), the positioning and fixing sheet (44) is arc-shaped, and fixed The corresponding parts of the fixed fixture seat (21) in the fixture assembly (2) have the same shape.

The operation process of the utility model is as follows: first, complete the installation of each part of the fixture according to the requirements, according to the thickness size of the sample (5), turn the inner hexagonal compression screw (24) to loosen the movable compression grip (23); then according to the sample (5) Half of the width of (5), adjust the positioning assembly (4), loosen the knurled fastening screw (41), and move the positioning ruler (42), according to the scale (52) on the positioning ruler (42) and the positioning guide column ( 43) the scale groove (61) on the alignment position, the placement of the sample is positioned by the positioning head (51) of the positioning ruler (42); when placing the sample (5), pass the sample (5) through the fixing fixture assembly (2 ) in the fixed fixture seat (21) and the movable clamping grip (23), and the movable fixture connector (31) and the movable clamping grip (23) in the movable fixture assembly (3), the sample ( 5) Close to the positioning head (51) of the positioning ruler (42) in the positioning assembly (4) to realize the accurate placement of the sample (5). Clamp the sample (5) tightly by grasping (23) to realize the fixation of the sample (5) at the corresponding positions of the fixed fixture assembly (2) and the movable fixture assembly (3); after the sample (5) is positioned and fixed, the knurled Loosen the fixing screw (41), remove the positioning ruler (42) from the sample positioning position and fix it, so as not to affect the test of the sample; finally, the whole system can be tested according to the setting, and the test sample (5) can be obtained by the drive shaft (11) motion test. related data.

Claims (4)

1. the Sample location assembly of a dynamic thermomechanical analysis apparatus double cantilever beam fixture, by two annular knurl trip bolts (41), two positioning rules (42), two positioning guide columns (43) and location stator (44) composition, it is characterized in that: positioning guide column (43) is by being screwed in the fixing threaded hole (71) of location stator (44), gathering sill (53) in positioning rule (42) coordinates with the spigot surface (62) of guidepost (43), the fastening screw (73) of positioning rule (42) by location stator (44) compresses by annular knurl trip bolt (41), different scales (52) in positioning rule (42) align from the scale groove (61) on positioning guide column (43) and determine the different placement locations of sample.

2. the Sample location assembly of a kind of dynamic thermomechanical analysis apparatus double cantilever beam fixture according to claim 1, it is characterized in that positioning rule (42) comprises positioning head (51), scale (52) and gathering sill (53) three part, the thickness of positioning head (51) is 5mm, and the precision of scale (52) is 0.5mm.

3. the Sample location assembly of a kind of dynamic thermomechanical analysis apparatus double cantilever beam fixture according to claim 1, it is characterized in that positioning guide column (43) comprises screw thread, scale groove (61) and spigot surface (62), the size between two spigot surfaces is identical with the width of gathering sill (53) in positioning rule (42).

4. the Sample location assembly of a kind of dynamic thermomechanical analysis apparatus double cantilever beam fixture according to claim 1, it is characterized in that location stator (44) comprises two groups of fixing threaded holes (71), fixed via (72) and fastening screw (73), location stator (44) is circular arc.