Spherical Hob Advantages:
1.Significantly reduces the construction cost of hydromill cutting
in hard rock layers, shortening the project duration.
2. No need for precutting holes, simplifying construction
equipment.
3. The hob-tooth hydromill wheel enables long-term continuous
operation (up to 100 hours), reducing the number of hydromill
lifts, effectively extending construction time, and simplifying
labor requirements.
4. Stable hydromill module operation with minimal gearbox impact,
reducing maintenance time and costs.
5. Low ground disturbance, making it suitable for construction near
buildings.
6. Enhances the deflection ability of hydromill cutting in hard
rock layers.
7. The vertical accuracy of the trench can be controlled within 1‰.
8. Saves over 20% of fuel (currently averaging 73L/h with a CAT C18
engine), making it more energy-efficient and environmentally
friendly.
Cutting wheels--Gearing box and cutting wheels
If the Spherical hob is to be effective, it must exert sufficient
downforce. A single hob requires at least 5 tons of downforce.
Taking the 1200mm thickness wheel as an example, a set of wheels
has a total of 54 hobs. , an average of 1/3, that is, 18 hobs, are
involved in rock breaking, and the total pressure required is at
least 90 tons. A single gearbox has to withstand 45 tons of
pressure, which requires the gearbox to have sufficient radial
load-bearing capacity. In addition, the hob is a rolling
rock-breaker, which does not require much torque. For safety
reasons, the gearbox torque is designed to be 150KNm; The output
end adopts a tapered hexagonal structure, which allows quick
installation and removal of the cutting wheel.
There are two main types of fixed cutting tools on the Spherical
hob, one is the side hydromill and the other is the main cutting
hydromill. There are three side hydromill designed, and two main
cutting hydromill on each trajectory line. There is also a flapper
tooth, which is designed in the form of a roller structure. The
structure is simple and practical, and it has better force
resistance than traditional machine. The structure of traditional machine flapper tooth is heavy and the force is poor, which will cause the
wear block and guide ring to wear out quickly.
Module Parameter with SC-135
| Parameter | Specification |
| Total hydromill Module Weight | 47–60ton |
| Wall thickness | 1000–2000mm |
| Maximum Torque of Gearbox | 180KNm |
| Gearbox Output Speed | 0–20rpm |
| Maximum Pressing Force | 60 ton |
| Maximum Ground Pressure | 120 ton |
Module Parameters with XCMG 120
| Parameter | Specification |
| Total hydromill Module Weight | 47–60ton |
| Wall thickness | 1000–2000mm |
| Maximum Torque of Gearbox | 180KNm |
| Gearbox Output Speed | 0–20rpm |
| Maximum Pressing Force | 60 ton |
| Maximum Ground Pressure | 120 ton |
