Development of yarder with a new interlocking equipment of DRK

由于缺乏简单、廉价、实用的联锁装置，日本的联锁装置技术一直落后于国外，其核心问题是如何根据两滚筒的旋转方向简化联锁齿轮的更换。为了响应其期望，我们开发了一种DRK (Differentialreibungskupplung)，具有简单且自动功能的变速装置，其最近构想的合适原理仅基于小型机械机构，而不像传统的国外昂贵的气移缸。此外，该船厂还采用了静压传动装置，以减轻操作人员驾驶时的麻烦。工厂基本试验的结果：a.原换齿轮装置的基本功能始终是完全保证的。因此，该装置似乎将广泛应用于其他目的，当操作线必须相互保持一定的张力，而不依赖于旋转滚筒的方向时。b. DRK控制的稳定性取决于DRK的内部结构，当DRK由暴露的圆盘型结构用四个单独的垫块制成时，DRK控制可以保持足够的稳定性。测井现场试验结果表明：a.由DRK和变速装置组成的DRK-设备效果显著。b.堆码机的作业效率相对于其他堆码机来说是足够高的。c.尽管连续使用，DRK在运行过程中产生的摩擦热并不多，除了需要强制冷却外，还需要强制冷却。d.果然减轻了操作人员的麻烦和体力负担。

Applying the slip-clutch apparatus to the yarder for the purpose of the inter-lock, whose techniques in japan have been behind the foreign countries because of lack in the simple, cheap and capable yarder of interlock, the essential problem is how to simplify the change of the interlocking gear according to the rotative direction of the two drums. In response to its expectation we developed a yarder of DRK (Differentialreibungskupplung) with a simple and automatically functional apparatus for its gear change, whose recently conceived suitable principle is merely based on the small scaled mechanical mechanism, unlike the conventional foreign expensive air-shift-cylinder. In addition a hydrostatic transmission was also introduced in this yarder to ease the trouble of the operator in driving.A. The results of the basic tests in the factory: a. The fundamental function of the original apparatus for gear-change was always perfectly assured. Therefore it seems that this apparatus will be applied to the other purposes widely when the operating lines must be kept each other in a certain tension independent on the directions of the rotating drums. b. The stability of DRK-control depended on the inside structure of DRK and could continue enough when it was made of structure in exposed disc type with four separate pads.B. The results of the field tests in logging operation: a. The effect of the DRK-equipmeat composed of DRK and the apparatus for gear-change was remarkable. b. The operational efficiency by the yarder was higher enough comparing with that by the other ones. c. The frictional heat generated in DRK during operation was not so much as any forced cooling was besides required, in spite of its continuous use. d. The trouble and the physical burden of the operator were really lightened as expected.