过顶是高低轮式小型斜面升船机在单绳牵引条件下的特殊问题。 单绳牵引克服了“无极绳”牵引的许多缺点,使牵引线路大为简化。但是,当承船车运行趋近峰顶时,卷扬机最后无法牵引承船在继续前进,成为牵引死点,如图1。 解决过顶问题是克服牵引“死点”,使承船车越过顶峰,实现升船机全程连续运行的关键。 Overhead is a special issue of high and low wheeled small bevel shiplift under single-rope traction conditions. Single-rope traction to overcome the “Promise rope” traction of many shortcomings, the traction circuit is greatly simplified. However, when the vessel runs close to the peak, the hoist can not finally tow the vessel to continue moving forward, as shown in Figure 1. To solve the problem of over-head is to overcome the traction “dead”, so that the carrier car crossed the peak to achieve the full operation of the ship lift the key to continuous operation.