GrabCAD 模型信息
RASSOR🌒bucket_in · 模型 267831
This concept aims to increase the fill ratio and speed up the discharge operation. When excavating, there is sufficient force to collect all the material into the bucket, but when emptying, the only engaged force is low lunar gravity, which might not be optimal for narrow and curvy interior sections of a closed drum bucket configuration. Operation: The shovel drum excavates the soil, which is transported via a shovel chamber up where falls out into the bucket. When full, the shovels rotate reverse while two independently hanging needles behind the shovel chamber push into the bucket wall. They are protected when the shovel orbits the bucket. For higher reliability, another pair is on the opposite side. Due to low gravity, the drum is open here, which allows a quick dump. Construction: A 3D printed model confirmed satisfactory operation (https://www.youtube.com/watch?v=UPq_6Xwj820&t=57s), but some friction forcing the freely suspended bucket to roll over as well. In this updated design, the bucket and shovel segment is mounted on an extended CF shaft. This fixed shaft allows adding a simple groove in the transmission housing cover, which limits the bucket travel. The drum is connected to the driving rod at the end of this extension. The shovel guides are rigid enough in the longitudinal direction with a little bit of flexibility in the transverse direction, which helps in absorbing accidental shocks. Pros: High fill ratio, quick and reliable discharge, reinforced drum axle, can drive-assist during transport without losing regolith, can collect rocks (sieving at the dump). Cons: Axle’s extension and additional hardware will increase the total mass of about 0,7 kg/1 drum Specification: Dimension: 443/310mm Total mass: 4,7kg (design allows potentially to remove two of the three guides which give -200g) Material: bucket CF, shovel Al/CF A single scoop width/volume: 71mm/~0,35l Bucket volume: ~25l Fill ratio: 99% Bucket full in 8-10 turns @20 RPM (1scoop 0,35lx8=2,8 l/1 turn ==>28l/10 turns) The test demonstrated the efficiency of the open shovel bucket, comparing to the closed one. The strengths were mentioned, but there are some weaknesses, of course. All the friction between the shovel and the bucket is actually not that bad. An accidental regolith fragment intrusion between shovel and bucket is a separate chapter. But there is a promising solution, very simple and robust, I'm on it. Also, shovel chamber entry requires some more care and material ...
- 格式
- STEP / IGES、Rendering、STL
- 分类
- Aerospace、Energy and Power
- 标签
- nasadrumchallenge
- 数据更新
- 2026-11-05T00:35:07Z