Clamp for crop stem bending test

Abstract

A clamp for crop stem bending test comprises a clamp holder (3) and a fixed chuck with an annular clamping cavity. The fixed chuck comprises a semicircular upper chuck (1) and a lower chuck (2), the bottom of the lower chuck (2) is fixedly connected with the clamp holder (3), and the upper chuck (1) is detachably connected with the lower chuck (2). A pushable arc-shaped inner chuck (4) is arranged in the annular clamping cavity of the clamp, the top of the inner chuck is vertically, upwardly and fixedly connected with a pitch adjusting screw (9), the pitch adjusting screw (9) is connected with a pitch adjusting nut (10) outside the fixed chuck through a hole at the top of the fixed chuck in a threaded manner, and a clamp groove (102) is arranged at the bottom of the pitch adjusting nut (10) and slidably clamped with a clamp ring (103) corresponding to the upper chuck (1). Straw positions with different diameters are fastened by the pushable arc-shaped inner chuck, the contact area of the inner surface of the clamp and surfaces of straws is increased, the pulling resistance of the clamp is improved, and the problem that ends of the straws are squashed is effectively reduced.

Description

technical field [0001] The invention relates to a clamp used in the test of the lodging resistance of crops, in particular to a clamp used for the bending test of crop stems. Background technique [0002] Lodging is a common problem in crop production and has become one of the important limiting factors for high and stable yield. In crop high-yield breeding, improving the lodging resistance of crop stems is an important breeding goal. The lodging resistance of stems is related to stem height, stem thickness and mechanical strength of stems. An important index to evaluate the mechanical strength of crop stalks is usually to test the bending resistance of the stalks. [0003] The cantilever beam bending test of the stem is to simulate the bending of the crop stem under the lateral force (such as wind, rain and other natural conditions), and the test results can reflect the mechanical strength of the crop stem against lodging. However, at present, the cantilever beam bending...

AI Technical Summary

Problems solved by technology

[0005] 2 During the bending test, the common clamps can easily crush the nodes of the crop stems, or when the ends of the stems are in hard contact with the ends of the clamps, the ends of the stems have already been crushed, making it impossible to effectively test the stems at the nodes. Stem lodging mechanical strength

[0006] The above two points fully demonstrate that ordinary fixtures cannot meet the requirements of the stem bending test because they cannot effectively fix the plant stems.

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