Outer hexagonal bolt with adjustable pre-tightening function based on magneto-rheological effect
A magneto-rheological effect and external hexagon technology, applied in the direction of screws, threaded fasteners, connecting components, etc., can solve the problems that the accuracy is difficult to guarantee, and it is difficult to apply to high-precision mechanical assembly occasions, achieving high precision and compact structure , the effect of low energy consumption
Inactive Publication Date: 2016-05-11
孙美娜
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Although this method is simple to operate, when the external environment changes greatly, the physical characteristics of the force-measuring element
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[0010] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.
[0011] combine figure 1 and figure 2 , the present invention is an external hexagonal bolt with adjustable pre-tightening function based on the magneto-rheological effect. Device 6, electromagnetic coil 7, sealing ring 9, piston 10, sliding washer 11, return spring 12 are formed. Its internal structure is: there is a chamber in the upper half of the bolt rod 3, the chamber is connected with the outside air through four chute 2 opened on the bolt rod 3, and the sliding washer 11 is connected to the bolt rod 3 through the four chute 2 The sliding pair is established and connected to the bolt head 1 through the return spring 12. There is a groove on the piston 10, and the electromagnetic coil 7 is wound in this groove. The piston 10 is fixedly connected with the sliding washer 11, and the sliding washer 11 drives it to move , the volume compe...
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The invention relates to an outer hexagonal bolt with an adjustable pre-tightening function based on a magneto-rheological effect, and the outer hexagonal bolt is used for regulating and controlling magneto-rheological strength, and regulating pre-tightening force to meet the occasion of a connected part with special pre-tightening force requirements. The outer hexagonal bolt comprises a bolt head, slide slots, a bolt rod, a magneto-rheological fluid, an isolating ring, a volume compensator, an electromagnetic coil, a sealing ring, a piston, a slide gasket and return springs. According to the outer hexagonal bolt, after determining the optimal initial pre-tightening force F0 of the connected part, the size of current which flows into the electromagnetic coil is regulated to regulate the magneto-rheological strength of the magneto-rheological fluid, so that shear yield stress of the magneto-rheological fluid is stabilized at the optimal initial pre-tightening force F0 of the connected part; and a nut is rotated for enabling the slide gasket to generate small movement, so that the force is finally determined as the optimal initial pre-tightening force F0 of the connected part. After being connected to the connector part, the outer hexagonal bolt does not need additional pre-tightening force detection; and a tightening process is a pre-tightening force detecting process, so that the operation is convenient, the precision is high, and the time and the labor are saved.
Description
technical field [0001] The invention relates to an external hexagonal bolt with adjustable pre-tightening function, in particular to an external hexagonal bolt with adjustable pre-tightening function based on the magneto-rheological effect. Background technique [0002] Most of the threaded connections must be tightened during assembly, so that the connection is pre-stressed before the working load, the purpose is to increase the reliability and tightness of the connection, so as to prevent gaps or cracks in the connected parts after loading. Relative slip occurs. Facts have proved that a larger pre-tightening force is beneficial to the reliability of the threaded connection and the fatigue strength of the connected parts, especially for threads with high tightness requirements such as cylinder heads, pipeline flanges, gearboxes, and bearing caps. Connection, preload is more important. However, excessive preload will lead to an increase in the structural size of the entire...
Claims
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Login to View More IPC IPC(8): F16B35/00
CPCF16B35/00
Inventor 孙美娜
Owner 孙美娜