Rapid positioning device for strain gauge pasting

Abstract

The utility model discloses a quick positioning device for strain gauge pasting, which comprises an upper side positioning frame, a lower side positioning frame and a composite material sample piece, the bottom of the upper side positioning frame is in sliding contact with the top of the lower side positioning frame, and wing-shaped bolts are arranged at the two ends of the upper side positioning frame in a penetrating manner. The bottoms of the wing-shaped bolts are in threaded connection with the tops of the two ends of the lower side positioning frame, clamping plates clamped with a composite material sample piece are integrally arranged in the middles of the bottoms of the upper side positioning frame and the lower side positioning frame, and rectangular through grooves are formed in the opposite faces of the upper side positioning frame and the lower side positioning frame. And rubber sleeves are fixedly mounted at the opposite angles of the rectangular through groove. Through the positioning mode that the rubber sleeve is connected with the diagonal lines of the rectangular through groove, and the crossed position is the center point of the rectangle, the positioning time of measuring the center position of the spline through the graduated scale is shortened, scribing is controlled through the adjusting structure, and the drawing accuracy of the test spline is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of material performance characterization testing, in particular to a fast positioning device for pasting strain gauges. Background Art

[0002] Composite materials have been increasingly developed and applied due to their advantages such as light weight, high strength, corrosion resistance, aging resistance, impact resistance, strong environmental adaptability, preparation flexibility and easy processing, such as in aircraft, rockets, spacecraft, automobiles, civil engineering, fans and many other fields.

[0003] Since the application environment of composite materials is relatively harsh, it is often necessary to test the performance of composite materials under high or low temperature environments. When testing the variable temperature mechanical properties of materials, how to accurately measure the surface shape changes of materials under variable temperature environments, or determine the physical parameters such as the strain of materials, has become a key issue in the mechanical properties testing of materials. The resistance strain gauge measurement method is a traditional method that can measure physical quantities such as strain, stress, bending moment, torque, acceleration, displacement, etc., and is an effective sensor for stress measurement.

[0004] At present, the positioning line of composite materials is mainly measured by a ruler to measure the midpoint of the width and effective length of the composite material. The midpoints of the width of the upper, middle and lower parts of the sample are measured by a ruler and connected into a straight line. Then the midpoints of the upper, middle and lower parts of the width direction of the sample are measured and connected into a straight line. The point where the two straight lines intersect vertically is the center point of the effective length of the composite material spline. This positioning line drawing method is not only time-consuming, but also prone to errors. The drawing accuracy of the positioning line is directly related to the accuracy of the results of the mechanical properties test of the composite material sample. Therefore, it is urgent to design a rapid positioning device for bonding composite strain gauges.

[0005] To this end, we propose a rapid positioning device for strain gauge pasting. Utility Model Content

[0006] The utility model aims to provide a fast positioning device for sticking strain gauges to solve the problems raised in the above-mentioned background technology.

[0007] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a rapid positioning device for strain gauge pasting, comprising an upper positioning frame, a lower positioning frame and a composite material sample, the bottom of the upper positioning frame is in sliding contact with the top of the lower positioning frame, both ends of the upper positioning frame are penetrated by wing-shaped bolts, the bottom of the wing-shaped bolts are threadedly connected with the top of the two ends of the lower positioning frame, the middle part of the bottom of the upper positioning frame and the lower positioning frame is integrally provided with a clamping plate clamped with the composite material sample, the opposite surfaces of the upper positioning frame and the lower positioning frame are provided with rectangular through grooves, the diagonals of the rectangular through grooves are fixedly installed with rubber sleeves, and the intersection point of the two rubber sleeves is the central intersection point of the rectangular grooves.

[0008] Optionally, sample end reinforcement plates connected to the detector are provided at both ends of the composite material sample.

[0009] Optionally, the ends of the bottoms of the upper positioning frame and the lower positioning frame away from the composite material sample are respectively integrally connected with support plates, and the bottoms of the support plates of the upper positioning frame and the lower positioning frame are flush.

[0010] Optionally, the bottom of the clamping plate arranged at the bottom of the upper positioning frame and the bottom of the lower positioning frame is higher than the bottom of the supporting sheet.

[0011] Optionally, connecting hooks are fixedly installed at the four corners of the rectangular through slots formed by the upper positioning frame and the lower positioning frame, and the two ends of the two rubber sleeves are fixedly installed at the connecting hooks at the diagonals of the rectangular through slots.

[0012] Optionally, through holes for wing-shaped bolts to penetrate are provided at both ends of the upper positioning frame, and the through holes at both ends of the upper positioning frame are symmetrically arranged.

[0013] Optionally, the diameter of the threaded portion of the wing-shaped bolt is smaller than the diameter of the through hole, and the diameter of the knob at the top of the wing-shaped bolt is larger than the diameter of the through hole.

[0014] Compared with the prior art, the beneficial effects of the utility model are:

[0015] The fast positioning device for pasting strain gauges clamps the composite material sample through an upper positioning frame and a lower positioning frame, so that the clamping plates of the upper positioning frame and the lower positioning frame are located between the sample end reinforcement plates at both ends of the composite material sample, and the diagonal lines of the rectangular through groove are connected by rubber sleeves, and the intersection position is the positioning method of the center point of the rectangle, which shortens the positioning time of the scale measuring the center position of the spline, and the marking is controlled by the adjustment structure, thereby improving the accuracy of drawing the test spline. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a cross-sectional schematic diagram of the overall structure of the positioning process of the utility model;

[0017] Figure 2 It is a top view schematic diagram of the overall structure of the positioning process of the utility model;

[0018] Figure 3 It is a front view schematic diagram of the overall structure of the positioning process of the utility model.

[0019] In the figure: 1. Upper positioning frame; 2. Wing-shaped bolt; 3. Lower positioning frame; 4. Composite material sample; 5. Rubber sleeve; 6. Sample end reinforcement plate; 7. Center intersection. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] See also Figures 1 to 3 The utility model provides a fast positioning device for pasting strain gauges, comprising an upper positioning frame 1, a lower positioning frame 3 and a composite material sample 4. Both ends of the composite material sample 4 are provided with sample end reinforcement plates 6 connected to the detector, the bottom of the upper positioning frame 1 is in sliding contact with the top of the lower positioning frame 3, both ends of the upper positioning frame 1 are penetrated by wing-shaped bolts 2, both ends of the upper positioning frame 1 are provided with through holes through which the wing-shaped bolts 2 pass, the through holes at both ends of the upper positioning frame 1 are symmetrically arranged, the diameter of the threaded portion of the wing-shaped bolt 2 is smaller than the diameter of the through hole, the diameter of the knob at the top of the wing-shaped bolt 2 is larger than the diameter of the through hole, the bottom of the wing-shaped bolt 2 is threadedly connected with the top of both ends of the lower positioning frame 3, and the middle part of the bottom of the upper positioning frame 1 and the lower positioning frame 3 is The body is provided with a clamping plate clamped with the composite material sample 4, and the ends of the upper positioning frame 1 and the lower positioning frame 3 at the bottom away from the composite material sample 4 are respectively connected with support sheets, the bottoms of the support sheets arranged on the upper positioning frame 1 and the lower positioning frame 3 are flush, the bottoms of the clamping plates arranged on the bottoms of the upper positioning frame 1 and the lower positioning frame 3 are higher than the bottoms of the support sheets, and rectangular through grooves are opened on the opposite surfaces of the upper positioning frame 1 and the lower positioning frame 3, and rubber sleeves 5 are fixedly installed at the diagonals of the rectangular through grooves. The four corners of the rectangular through grooves opened by the upper positioning frame 1 and the lower positioning frame 3 are respectively fixedly installed with connecting hooks, and the two ends of the two rubber sleeves 5 are respectively fixedly installed with the connecting hooks at the diagonals of the rectangular through grooves, and the intersection of the two rubber sleeves 5 is the central intersection 7 of the rectangular grooves.

[0022] Working principle:

[0023] Loosen the wing-shaped bolt 2, move the upper positioning frame 1 and the lower positioning frame 3 toward both ends, so that the upper positioning frame 1 and the lower positioning frame 3 are aligned between the sample end reinforcement plates 6 arranged at both ends of the composite material sample 4, move the upper positioning frame 1 and the lower positioning frame 3 toward each other in a direction perpendicular to the axis of the composite material sample 4, clamp the composite material sample 4 through the clamping plate integrally arranged in the middle of the bottom of the upper positioning frame 1 and the lower positioning frame 3, then tighten the wing-shaped bolt 2 to fix the upper positioning frame 1 and the lower positioning frame 3 to the composite material sample 4, and connect the diagonals of the rectangular through groove through the rubber sleeve 5. The central intersection 7 of the two rubber sleeves 5 is the center point of the rectangular through groove, which is also the pasting position of the strain gauge.

[0024] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A fast positioning device for sticking a strain gauge, comprising an upper positioning frame (1), a lower positioning frame (3) and a composite material sample (4), characterized in that: The bottom of the upper positioning frame (1) is in sliding contact with the top of the lower positioning frame (3), and wing-shaped bolts (2) are provided through both ends of the upper positioning frame (1). The bottom of the wing-shaped bolts (2) is threadedly connected to the top of both ends of the lower positioning frame (3). A clamping plate for clamping the composite material sample (4) is integrally provided in the middle of the bottom of the upper positioning frame (1) and the lower positioning frame (3). Rectangular through grooves are provided on the opposite surfaces of the upper positioning frame (1) and the lower positioning frame (3), and rubber sleeves (5) are fixedly installed at the diagonals of the rectangular through grooves, and the intersection of the two rubber sleeves (5) is the central intersection (7) of the rectangular grooves.

2. A rapid positioning device for strain gauge bonding according to claim 1, characterized in that: Both ends of the composite material sample (4) are provided with sample end reinforcement plates (6) connected to the detector.

3. A rapid positioning device for strain gauge bonding according to claim 1, characterized in that: The ends of the bottoms of the upper positioning frame (1) and the lower positioning frame (3) away from the composite material sample (4) are respectively integrally connected with support plates, and the bottoms of the support plates of the upper positioning frame (1) and the lower positioning frame (3) are flush.

4. A fast positioning device for strain gauge bonding according to claim 3, characterized in that: The bottom of the clamping plate arranged at the bottom of the upper positioning frame (1) and the bottom of the lower positioning frame (3) is higher than the bottom of the supporting plate.

5. The rapid positioning device for strain gauge bonding according to claim 1, characterized in that: The four corners of the rectangular through slots formed in the upper positioning frame (1) and the lower positioning frame (3) are respectively fixedly mounted with connecting hooks, and the two ends of the two rubber sleeves (5) are respectively fixedly mounted with the connecting hooks at the diagonal corners of the rectangular through slots.

6. The rapid positioning device for strain gauge bonding according to claim 1, characterized in that: Through holes through which wing-shaped bolts (2) pass are provided at both ends of the upper positioning frame (1), and the through holes at both ends of the upper positioning frame (1) are symmetrically arranged.

7. A fast positioning device for strain gauge bonding according to claim 6, characterized in that: The diameter of the threaded portion of the wing-shaped bolt (2) is smaller than the diameter of the through hole, and the diameter of the knob at the top of the wing-shaped bolt (2) is larger than the diameter of the through hole.

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