34results about How to "Add limit function" patented technology

The invention discloses a pulley device of a high-redundancy absolute grating ruler read head. The pulley device of the high-redundancy absolute grating ruler read head comprises a pulley body, a first idler wheel, a second idler wheel, a first angular encoder, a second angular encoder, fixed idler wheels, a scanning circuit board and grating glass, wherein the radius of the first idler wheel and the radius of the second idler wheel are different, the grating glass is installed below the pulley body, the scanning circuit board is installed below the grating glass, the first idler wheel and the second idler wheel both of which the radiuses are different are respectively fixed to the lower end of the pulley body, the first angular encoder and the second angular encoder penetrate through the pulley body to be connected with the first idler wheel and the second idler wheel respectively and are used for recording the rolling angle of the first idler wheel and the second idler wheel in the measurement process, the fixed idler wheels are fixed to the side face of the pulley body, and the fixed idler wheels are tight attached to the grating glass to roll in the measurement process. The pulley device of the high-redundancy absolute grating ruler read head can improve reliability of reading, has the functions of judging the direction of movement of the grating ruler read head and calculating the displacement, and provides the standby limit function of a grating ruler.

The invention provides a mechanical seal limiting mechanism which comprises cylindrical holes, positioning blocks, an upper half ring, a second O-shaped ring, a second sealing ring groove, a lower half ring, nuts, through holes, locking cylinders and a fixing ring. The upper half ring is arranged at the upper end of the lower half ring, the two cylindrical holes are formed in the right end face of the upper half ring and the right end face of the lower half ring correspondingly, and the two positioning blocks are welded to the left end of the upper half ring and the left end of the lower half ring correspondingly. By means of the design, a limiting block and a static ring end cover can be better connected in a positioned mode, and the separable limiting block is more convenient to mount and dismount; the two through holes are symmetrically formed in the upper and lower ends of the interior of the fixing ring, and the locking cylinders penetrate through the through holes; and the nuts are mounted on the locking cylinders and fixed to the left end of the fixing ring. According to the design, when the limiting block loses efficacy, the limiting block can be prevented from moving, working stability is further guaranteed, and the mechanical seal limiting mechanism is good in stability, high in reliability, long in life and easy to mount and dismount.