DY-2 Butterfly Extensometer Extensometer Wholesale Price

Butterfly extensometer wholesale price
Butterfly extensometer overview:
Butterfly extensometer is a mechanical contact displacement meter, which is most suitable for measuring various small materials. Displacement to obtain indicators of certain mechanical properties of the material. The butterfly extensometer has a simple structure, is easy to use, works reliably, has good adaptability, is economical and durable, and can be used repeatedly. The sensitivity of measurement can be improved by increasing the gauge length. The instrument is light in weight, has clear readings and has a compact structure. Dial indicators and dial indicators can be selected according to different accuracy requirements. Therefore, this instrument is a necessary and ideal instrument in material testing.
Main uses of butterfly extensometer:
Butterfly extensometer is mainly used to measure certain mechanical properties of metallic materials and some non-metallic materials. It can be used with a universal testing machine to measure the displacement or strain of the material, and the elastic mold and yield strength of the material can be obtained through conversion. And can be used for deformation control of steel bar tensioning process. The butterfly extensometer can be used in a variety of conditions, and can be used indoors and outdoors with negotiated solid fiber deformations without modification. Therefore, it is widely used in the measurement, analysis and control of industrial displacement or strain. It is especially superior for measuring the mechanical properties of threaded steel bars.
Structure and principle of butterfly extensometer:
Butterfly extensometer mainly consists of three parts: sensory deformation part, transmission part, and indication part.
Feel the deformation part: It is mainly composed of the upper knife edge and the lower knife edge. and in direct contact with the test rod. The upper blade can move up and down on the benchmark. Fixed at selected position. The lower blade can rotate around its own midpoint. The lateral movement of the upper and lower blades is realized by the spring set in the guide rod moving in the guide sleeve. The longitudinal distance between the upper and lower knife edges is the gauge length of the sample, and the transverse distance is the diameter variation range of the sample. The upper and lower cutting edges have high hardness and wear resistance.
Transmission part: The deformation is transmitted to the scale through two movable lower blades installed on the left and right bodies of the gauge. One end of the movable lower blade is a sharp angle. The other end is inlaid with a top, both of which are hardened. The moving knife edge is supported on the screw cone tips screwed into the left and right bodies respectively, forming an equal-arm lever. The cooperation of the two support points affects the sensitivity of the scale, and the arm length ratio relationship will directly affect the sensitivity of the scale. numerical value. When the extensometer is working, the task of the transmission part is to transmit the deformation within the gauge length range of the specimen to the matching gauge, and visually reflect it through the rotation of the pointer.
Indicating part: The two gauges used with this type of extensometer, (a dial indicator with a graduation value of . or a dial indicator with a graduation value of . ) can be selected according to different accuracy requirements. The end of the measuring rod of the meter is inlaid with a carbide sheet, which is ground to a smooth finish of ▽ or above. The dial indicator shall be calibrated in accordance with B~ calibration regulations: The dial indicator shall be calibrated in accordance with B~ calibration standards and shall be qualified. It can be seen from the figure that when the upper and lower blades of the butterfly extensometer are tightly stuck on the specimen. The axial displacement caused by the force on the specimen causes the knife edge to rotate around the midpoint. Since the lever ratio is:, the scale reflects the axial displacement value. It can be seen from the construction principle that the sensitivity of the butterfly extensometer to strain measurement is variable. The sensitivity increases with the increase of the gauge length, but at this time the measuring range of the instrument becomes smaller because the measuring range of the gauge is fixed.
Maintenance points of the butterfly extensometer:
The butterfly extensometer is made of aluminum alloy and equipped with a precision gauge. When using it, you must handle it with care.
The measuring head, upper and lower knife edges should be kept clean, wipe them clean after use, apply anti-rust oil, put on the knife edge protective cover and put it in the box.
. The lower cutting edge of the butterfly extensometer is supported by two cones. It has been adjusted at the factory and cannot be adjusted casually.
When the deformation of the tested piece exceeds the maximum range of the butterfly extensometer, it must be removed and stopped using to avoid damaging the instrument.
. When using the spring cap to adjust the spring clamping force, the spring cap must be returned to the original position after use of the instrument
Main specifications of the butterfly extensometer:
, Maximum size of the clamped specimen : Diameter of cylindrical specimen and thickness of plate specimen.
, gauge length size range.
, Equipped with meter:
Dial indicator: Measuring range: Graduation value:
Dial indicator: Measuring range: Graduation value:
, Equipped with meter accuracy level: Level
How to use the butterfly extensometer:
According to the use and actual needs, determine the gauge length value and select the scale.
Adjust the position of the upper knife edge so that the distance between the upper and lower knife edges is equal to the gauge length value.
Loosen the fastening screws and adjust the position of the scale so that the bottom surface of the upper blade is in contact with the positioning screw on the bottom plate, and the top is in contact with the flat surface of the scale. When measuring tensile deformation, the starting position of the scale should be above the forward stroke of the pointer. It should be noted that when tightening the gauge, ensure that the measuring rod of the gauge can move up and down freely without getting stuck. If the system is used repeatedly, there is no need to adjust the position of the scale for each test.
. Hold the butterfly extensometer, compress the spring to separate the two blades, and clamp it on the specimen. If the clamping force is not enough, you can adjust the connecting plate spring cap.
When increasing the clamping force of the upper knife edge, a clamping frame needs to be used on the benchmark. Its position should be as close as possible to the upper knife edge. The clamping force can also be adjusted through the spring cap.
Take the average of the values in the two tables to calculate the elongation of the specimen within the gauge length range.