Coaxiality-adjustable winding type tensile fixture

Abstract

The invention relates to a tensile fixture, and particularly discloses a coaxiality-adjustable winding type tensile fixture. The coaxiality-adjustable winding type tensile fixture comprises an upper fixture and a lower fixture which are arranged along the vertical direction, have the same structures and are in mirror symmetry, wherein the lower fixture comprises a fixture body; the lower end of the fixture body is connected with a connector; the fixture body is provided with a winding column and a clamping roller which are arranged along the transverse direction; the winding column is provided with a left and right adjustment mechanism; the clamping roller is provided with a clamping mechanism. After the coaxiality-adjustable winding type tensile fixture is used, the coaxiality can be adjusted according to the diameters of different samples, so that test force and deformation measurement are guaranteed, the stress of the samples is relatively dispersed, the samples are prevented from being damaged at the clamped parts, the breakage of the sample at the root of the fixture can be effectively prevented, lateral swing caused by the gravity of the fixture can be effectively reduced, and the sample can be conveniently clamped.

Description

(1) Technical field [0001] The invention relates to a stretching fixture, in particular to a winding stretching fixture with adjustable coaxiality. (2) Background technology [0002] The common structure of the general soft material tensile test fixture is to wrap one or several circles in a circular arc or semi-circular arc, and then fix it with some kind of mechanism. The clamped root was broken, and more reliable test data was obtained. [0003] However, the common winding type tensile clamp has the following three problems: [0004] The first problem is that common winding tensile fixtures cannot solve the coaxiality problem after clamping tensile samples of different diameters. For example, after a rope with a diameter of 1mm and a rope with a diameter of 3mm are clamped by the same tensile fixture, the sample The axis will deviate from the axis of the testing machine by 1mm. [0005] The main measurement result of the tensile test is the relationship between the...

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Problems solved by technology

[0004] The first problem is that common winding tensile fixtures cannot solve the coaxiality problem after clamping tensile samples of different diameters. For example, after a rope with a diameter of 1mm and a rope with a diameter of 3mm are clamped by the same tensile fixture, the sample The axis will deviate from the axis of the testing machine by 1mm

During the actual measurement of the testing machine, the distance S between the axis of the extensometer and the axis of the testing machine is generally between 150mm and 300mm. The Abbe error caused by the shaft will be between 0.262mm~0.524mm. When the deformation is 100mm, the Abbe error is 0.262%~0.524%, and the deformation measurement accuracy of the testing machine should generally not exceed 0.5%~1%. It can be seen that The Abbe error caused by different axes is the main error in the deformation measurement of the tensile test, which will have a huge impact on production and research

[0010] Also, when the test sample and the testing machine are not in the same axis, a lateral force will be applied to the load sensor, which will easily cause damage to the load sensor and affect the accuracy of the sensor. Even if a universal joint is added between the sensor and the fixture, Also only protects the load cell to a certain extent

[0011] The second problem is that the fixed part of the common winding tensile fixture is often sharp after winding, and it is easy to damage those samples with low strength, and let it break at the fixed part, resulting in the failure of the test

[0012] The third problem is that the left and right sides of the common winding tensile fixture are often unbalanced. When it is suspended on the testing machine through the universal joint, due to the action of gravity, the fixture will be skewed to the heavier end, which will make it difficult to clamp the sample.

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