Encourage everyone to understand all points of view. Avoid giving your personal opinions unless it is a small, informal meeting. A chairman tries to be impartial. After everyone has said everything they wish, put the motion to a vote. State the results.
People often confuse voting to end discussion with voting on the motion itself.
Here, it ends debate and forces a vote on the original motion. You do not need a vote ro end the discussion. This motion requires a simple majority. Reopen the discussion when the time agreed upon arrives. When members have strong opinions and are not understanding one another, suggest tabling the motion until the beginning of the next meeting.