String tightening method of string tightening type semi-rigid base plate

Abstract

The invention discloses a string tightening method of a string tightening type semi-rigid base plate. the string tightening method comprises the steps that after pretreatment and performance verification of a string tightening process part are conducted according to predetermined process parameters, a product is installed on a pretreatment tool through tightened strings and placed in a drying ovento be subjected to heating and loading pretreatment; in the string tightening process, the semi-rigid base plate is installed on a string tightening tool by means of a pressing point positioning mechanism, one end of each tightened string is fixed to the semi-rigid base plate, the other ends of every two adjacent tightened strings are installed on the same tension adjusting device, and tension isapplied to all the tightened strings of the semi-rigid base plate by adjusting the tension adjusting device; and meanwhile, tool strings are installed on a base plate frame on one side of the to-be-fixed ends of every two tightened strings, two times of tightened string tension is applied, the tool strings are fixed on a tool tightened string fixing device, still standing is conducted for a certain period of time, each tightened string and the base plate are cemented and fixed after the tension value is stable, and the semi-rigid base plate is taken out after curing. Tension test is conductedon all span tightened strings of the semi-rigid base plate through a tension tester cemented by a tightened string tension cementing tool.

Description

technical field [0001] The invention relates to a string stringing method of a string string type semi-rigid substrate, belonging to the field of frame composite material structure manufacturing. Background technique [0002] The stringed semi-rigid substrate is a brand-new structural form, mainly to meet the power supply (≥25kw) requirements of the new generation of ultra-large-capacity geostationary orbit satellite platforms, the requirements for weight reduction of the solar wing, and the high deployment stiffness of the solar wing. It is mainly composed of a substrate frame, a string positioning bracket and a Kevlar fiber braided string, all of which are assembled into one body by adhesive bonding. [0003] Kevlar fiber braided string adopts the structure of unidirectional core bundle (rope core) + braided sheath (rope sheath), but due to the molecular segment movement of the fiber material and the microbending of the unidirectional core bundle caused by the weaving proc...

AI Technical Summary

Problems solved by technology

[0006] 1) The large-load pre-tensioning treatment method at room temperature is more effective for ropes used at room temperature, but when the rope experiences high and low temperature environments, its length still changes, which cannot meet the actual working conditions of semi-rigid substrates;

[0007] 2) Multiple high and low temperature cycles and multiple variable load pretensioning methods have high requirements for pretreatment equipment, processing cycle and cost, and are not suitable for string stringing of semi-rigid substrates with long single size and large batches;

[0009] 1) The strings are stretched in different areas, resulting in uneven tension of the strings on the whole board;

[0010] 2) The influence of the deformation of the frame under load on the string tension is not considered, and the string tension of the substrate after forming is small and the uniformity is poor;

[0011] 3) The local deformation of the semi-rigid substrate frame caused by the tension of the string is not considered, which may easily cause the dimensional accuracy of the important mechanical interface of the substrate to be out of tolerance

[0012] 4) The friction between the string and the string support cannot be removed, which affects the tension uniformity of the string on the whole board;

[0013] 5) During the tensioning process, the tension cannot be monitored and adjusted in real time

[0015] 1) Limited by human factors and measurement system errors, the measurement accuracy of the weight hanging method is poor, and the operation process is cumbersome, the amount of recording and calculation data is large, and the measurement cycle is long;

[0016] 2) The tension tester is mainly suitable for the rope structure of the open system. It is not suitable for the structure of the string between the two string brackets of the semi-rigid substrate. The measured results cannot represent the real string tension.

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