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1、 ???????? ?????

?????? ???? ??? ?? ???? ??? ??? ?????? ?????? → ????? ?????? → ????? ??????? → ???? → ?????? → ?????? ??????? ????? ???? ?????? ?? ??? ????? ???? ????? ?? ??????? ?????? ?? ??????, ??? ????? ???-??? ????????, ???? ???-??? ???????? ?? ????-??? ???????? ??? ??????? ???? ?? ???? ???

1. ????? ??? ??? ???????? ???? ????? ???????

?????? ???????? ?????? (???? ???????? ????, ?????? ??????? ????????????, ???) ???? ??? ?? ?????? ??????? (???? ????????) ?? ??????? ???? ???? ??, ?? ?????? ??????? ?? ?????? ???? ???? ??? ???? ??? ?? ???? ??? ?????????? ???????? ??????? ?????? ?????????? ?? ???, ???? ????? ?? ?????? ?? ????? ???? ?? ????? ???? ???? ??, ?? ????? ???? ???????? ??? ?? ?????? ??????? ?? ?????? ?? ??? ?????? ?? ????? ???? ??? ????? ????? ?? ???? ????? ???? ???? ??? ??????, ?? ???? ?? ???? ??? ???????? ?? ??? ??? ??? ???? ??, ????? ?????? ?? ????? ?????? ?? ???? ???? ??????? ??? ???? ?????, ????? ???? ????? ???? ?? ????? ???? ?? ????? ?????????? ????? ?? ??????? ???? ?? ??? ???? ???, ?? ???? ?? ???? ?? ???? ???? ?????, ??????? ???? ????? ????? ???-??? ???????? ?? ????? ???? ???? ????

2. ???? ??? ??? ???????? ???? ????? ???????

?????? ?? ??? ????? ???? ????? ????????? ???? ?? ??? ??? ?? ?????? ??? ?? ??? ??? ??????? ???? ??, ????? ????? ?????? ?? ????? ???? ?? ?????? ??? ?? ??? ????? ?? ??? ???? ???? ??, ?????????? ??? ?? ???? ??? ?? ???? ????? ?? ???????? ?????? ?? ????? ??, ?? ???????? ??????? ?? ???? ???? ????? ???????? ??????? ?? ???? ??? ????? ?? ??? ?? ??? ????? ???? ?????? ?? ???? ??? ?? ?????? ?? ????, ???? ??????? ??? ?????? ???? ??? ?? ???? ???? ???? ?????? ????? ?? ??? ??????? ???? ??? ???????? ???? ??????? ??? ?????? ?????? ?? ?????? ??? ?? ????? ???? ????

2、 ?????????? ?????????

1. ????? ??? ??? ???????? ???????

?????? ?? ??? ????? ???? ??????? (???? ?? ????? ????, ????? ??????????, ???) ??? ???-??? ?????? ???? ???? ???: ± 0.01 ????、 ± 0.005 ????、 ± 0.003 ????、 ± 02 ????), ????? ????? ???-??? ???????? ??? ????????? ?????, ?? ?????? ?????? ?????? ???? ?? ???????? ???? ???

?????? ?? ??? ????? ???? ????? ?? ????? ???????? (????? ??????) ?? ??? ?? ???-???? ??????? ?? ??? ???? ??? ????? ??????? ?? ?????? ???? ????? ?? ??? ??????? ?? ?????? ???? ??? ?? ???? ??? ?? ????? ?????? ?? ????? ???? ??? ?????, ?????? ?? ???? ???? ???? ????? ?????? ?? ??? ???? ?? ??? ???? ??? ?? ??????? ????????? ??? ?????? ?????? ?? ?? ???? ?????? ??? ??????? ?? ????????? ??? ????? ?????? ?? ?? ???? ?? ??? ??? ??? ???? ????? ??????? ?????? ?? ????????, ???? ??? ?????? ?? ????? ??????, ???? ??? ?? ??????, ????? ?????? ?? ?????? ?????? ???? ???? ????

???????? ??? ???, ????????? ???? (???? ?????) ?? ????, ??? ????? ???? ????? ?????? ????? ?? ???? ?? ????, ????? ???? ?? ??????? ???? ?? ???? ?? ????? ???, ?? ?????? ????? ?? ??? ??????? ??, ????? ???? ??? ?? ???? ??????? ??? ???? ?? ???? ?? ???? ??????? ???? ?? ??? ???? ?? ??????? ?? ???? ??, ????? ?????? ?? ?????? ?? ??? ?? ?????????? ??? ???? ??????, ???? ?????? ?? ??? ????? ???? ?? ??? ???? ???? ??, ????? ?????? ???? ??? ?????? ?????? ?????? ??????? ???? ?? ???? ??? ???? ????? ??? ??, ????? ???? ?? ??????? ?????? ????????? ???? ?? ???? ??, ????? ??????? ?? ?????? ?? ????????? ???? ?? ??? ?? ??????? ???? ??? ?? ???? ?? ?????? ?? ???? ????? ??? ????? ?? ????? ?? ????? ???? ???? ?? ??? ????? ?? ???????? ??? ???? ??????? ???? ??? ?? ????????? ???????? ????? ???? ?? ??????? ???? ??? ????? ??, ?? ????? ???? ???? ?? ????? ?? ?? ???? ??? ?? ??? ????? ?? ????? ????????? ??, ?? ?????? ????? ????? ???? ??? ?? ????????? ???????? ????? ????? ??? ????? ??, ?? ????? ???? ???? ?? ????? ?? ?? ??? ?? ??? ????? ?? ????? ??? ???? ??? ??, ?? ?????? ???? ?? ????? ???? ??, ???? ??????, ?? ????????? ???????? ?? ???? ?? ?????? ??, ????? ???? ???? ?? ???? ???? ?? ?? ???? ??? ??? ??? ??? ??? ????? ????? ???? ???

??????? ??????? ?? ??????: ?? ??? ??, ??????? ??????? ?? ??????? ?????????? ???? ???? ??, ?? ??? ?? ???? ??????? ?????? ???? ???? ???????, ????? ???? ?? ????? ?????? ????????????? ???? ??? ???, ?? ???? ????? ???????? ?????? ????????? ?????? ??????? ???? ?????? ?? ????? ??? ??? ?????? ?? ???????? ???? ???? ???? ???? ???? ??? ?? ???? ???? ???? ?????, ?? ???? ????? ??? ?? ??? ???? ??, ?? ????? ???? ??? ?? ???? ?? ???? ?? ???? ????? ???? ??, ????? ????? ???? ?? ????? ?????? ????????????? ?? ???? ?????? ????? ??? ?????, ????? ???-??? ???????? ??????? ?? ????? ???? ?? ???, ??????? ?? ?????? ??? ????? ??? ???? ?? ?????, ???? ??????? ??????? ??? ????? ???? ?????? ??????, ?? ???? ????? ????? ?? ???? ??? ??? ????? ?????? ??, ????? ???? ????? ?? ???? ?? ?? ?? ??? ?? ??? ???? ??? ??? ? ???? ?????? ??? ??? ?? ??, ????? ???? ??? ????? ?????? ????? ???

2. ???? ??? ??? ???????? ???????

????? ????? ???? ????? ???? ?? ??? ?????? ?? ????? ?? ??????? ???? ??, ????? ??? ??? ???? ???? ???? ??, ????? ???????? ?? ??? ???????? ???? ???? ??? ???? ??????? ??? ??????? ?????? ?? ???? ?????? ????? ??? ?? ??? ?????? ?? ??????? ?? ?????? ????????? ?? ?????? ???? ??? ??????? ???????????? ??? ????? ?? ???, ?????? ??? ?????? ?? ??????? ???????????? ???? ???? ??, ?? ????-???? ??? ?????? ????? ??? ??? ?? ??? ?? ?????? ????????? ?? ?????? ?? ???? ??? ???? ?????, ??????? ????????? ???, ??? ?????? ?????? ??? ?????? ????? ?? ????? ???? ???? ??, ?? ??? ?? ?????? ????????? ?? ???? ??? ?? ?????? ?? ???? ??? ???? ?????, ?? ???? ??? ?????? ??? ?????? ?? ?????????? ?????? ?? ???? ??? ?? ????? ?????? ?? ?????? ?? ???? ???? ?? ??? ???? ?????????? ???? ?? ????? ???? ???? ?? ??????? ???, ???? ??? ??? ???????? ??????? ???? ????? ?? ???? ?????? ??????? ???? ?? ??? ????????? ???? ??? ????? ???

3、 ????????

To sum up, it can be seen that in theory, if the external factors are not considered, the full closed-loop control may improve the positioning accuracy of the foundation than the semi closed-loop control. But if we can’t solve the problems of machine heating, environmental pollution, temperature rise, vibration, installation and other factors, the phenomenon of full closed loop is worse than half closed loop. It may be effective in a short time, but as time goes on, the influence of dust and temperature changes on the grating ruler will seriously affect the measurement feedback data, thus losing its function. At the same time, when there is a problem with the grating ruler, an alarm will be generated, resulting in the machine can not work.

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