THE 5 HIGHLIGHTS OF HAMM SERIES VC
The compactor with vibration crusher drum is a special compactor which has been optimised for the special application of crushing, releasing and compacting soils and aggregate. The use of various cutting tools or, alternatively, of padfoot inserts makes the machine a versatile device.
MODEL OVERVIEW
View Hamm 3625 HT VC at: HERE
THE 5 HIGHLIGHTS OF THE SERIES VC
1. MACHINE EQUIPMENT
FRONT FRAME
The front frames of compactors with vibration crusher drums are well equipped for their tasks.
- Design
- Equipment
- Heavy duty features
Vibration compactors are not approved for operation on public roads because they have no lighting package. As headlights are needed in the field, they are integrated into the vibration compactor. However, the front frame does not have position lights.
Design (equals that of the Series H): There are two models: The 3625 HT VC of the Series 3000 and the H 25i VC of the Series H. They allow both TIER 3 markets and TIER 4 markets to be served. Both machine models have identical front frames.
Equipment: Large angle of driving slope, collision buffer front end, scraper (front and rear) top, hose protection as standard.
Heavy duty features: heavy duty front frame, heavy duty drum suspension, high-performance drum drive.
REAR FRAME
The rear frame of a vibration compactor also features special equipment.
EQUIPMENT
EM tyres - Decoupled step (H 25i VC only)
HEAVY DUTY
Heavy duty features: heavy duty 3-point articulation, heavy duty underbody protection
DRUM
Features of the vibration crusher drum:
- Drum width 2.22 m (84'')
- Drum with 150 toolholders
- Rigid imbalance (just 1 amplitude).
OPERATOR PLATFORM
Operator platform equipment:
1. Cabin with working lights and headlights (standard)
2. Driver's seat with high backrest and seat contact switch
3. HAMM Compaction Meter.
OTHER FEATURES
HEAVY DUTY VERSION
Some components are reinforced due to the special requirements and strains on the machine. Overview:
- Heavy duty front frame
- Heavy duty drum suspension
- High-performance drum drive
- Heavy duty 3-point articulation
- Heavy duty underbody protection
Crushing big rocks may sometimes result in heavy floating of the front frame. Design solution for VC:
- More screwing points at the front frame
- Torsion-reinforced frame (milled frame) for improved absorption and distribution of the forces
- Heavy duty front frame (sheet thickness, torsion-reinforced)
Heavy duty drum suspension: conventional vs. vibration crusher drum
Due to a higher torque of the drum drive and the loads due to operation, more forces act on the drum and its suspension. Design solution for VC:
- Heavy duty drum suspension with 28 screwed joints per side
- Additional rubber buffers at the drive end
- Additional rubber buffers at the vibration end
The machine needs higher gradeability when driving forth and back on rock or rocky subsoil and to avoid getting stuck in the material.
- Design solution for VC: Larger drum drive for higher driving torque (+25 % gradeability at about 60 %)
Heavy duty 3-point articulation
Crushing big rocks may sometimes result in heavy floating of and load on the front frame. Design solution for VC:
- Heavy duty articulated joint with new contour
- Articulated joint made of highly wear-resistant steel
View more at: HERE
If a rock is not crushed, the underbody protection protects the axle, the DPF (in case of Tier 4i) etc. Design solution for VC:
- Segmented underbody protection (easier to replace in case of service)
- Material thickness increased from 4 mm (0.16'') to 10 mm (0.4'')
- Underbody protection placed onto frame
STANDARD EQUIPMENT
Some of the options for the standard machine are provided as standard with the vibration compactor.
HAMMTRONIC
The Hammtronic electronic machine management system is used to monitor engine and vehicle functions. It includes adjustment of drive unit, vibration/oscillation and engine speed to the current operating conditions. Perfect machine tuning is guaranteed by combining all machine data to achieve optimal compaction or crushing quality.
See more at: HERE
HAMM COMPACTOR METER
- Measuring and indication of sub-base stiffness by means of the acceleration sensor at the vibrating drum. The HAMM Compaction Meter is of special importance because the driver can immediately detect when the machine changes to jumping operation. Vibration must be stopped immediately if jumping operation persists. This will protect the machine and the aggregates.
EM TREAD
EM tread (extreme conditions) - Tyre for smooth or padfoot drum
| Advantages | Disadvantages |
| Resistant to sharp-edged material. Good running characteristics on hard abrasive sub-bases. Increased durability | Lower traction in case of cohesive materials |
RACES FOR TRANSPORT
Special races support the transport of the machine to not damage the asphalt/sub-base. The races are suitable for transfers on the field and for truck transport. The machine is not suitable for transfer journeys on the road because it must not drive on public roads (no lighting).
Seat with high backrest
The seats have high backrests (optionally imitation leather or fabric) for higher driving comfort.
Retrofitting a standard machine to VC version is not possible. The same goes for conversion of a vibration compactor to a standard vibration compactor. A VC version of the 20 t (44,100 lbs) machine does not make sense economically due to the load and the performance.
2. VC QUICK-CHANGE TOOLHOLDER SYSTEM
Let's look at the construction of the vibration crusher drum. Its special design features 10 x 15 toolholders, i.e. a total of 150. Features of the toolholders:
- New locking system for contamination protection under the toolholder
- Integrated tool lock
- Easy assembly/dismantling
- Simple locating of the cutting tool
- Can be used for all vibration crusher drums
TOOLHOLDER AND TOOLS
There are different tools for the drum, depending on application and soil composition.
Standard cutting tools for low-abrasion materials
Heavy duty cutting tools for hard aggregate and high-abrasion materials
Padfoot insert for cohesive materials
They are stored in a box for easy and safe keeping of the tools.
The tools (hammer and drift punches) for installing and removing the inserts are supplied.
- Optimised assembly
The conical receivers of the tools optimise installation and removal.
3. DRIVE UNIT
The drive of a machine with vibration crusher drum is different from the drive of a standard machine in three aspects.
Drive - 1 amplitude (preferred rotational direction)
With the automatic vibration system, the rotational direction of the imbalance in the drum changes automatically (preferred rotational direction). That is, drum and imbalance always rotate in the same direction. Accordingly, the material will always be drawn under the drum.
Preferred rotational direction of the drum - without automatic vibration system
If the automatic vibration system is not active, the preferred rotational direction always is forward. Therefore, the material will not be drawn under the drum when reversing.
Button for activating the automatic vibration system
Preferred rotational direction of the drum - with automatic vibration system
If the automatic vibration system is active, the preferred rotational direction is forward in travel direction. Therefore, the material will be drawn under the drum also when reversing.
Drive - gradeability
Due to the special use of the machine, the vibration compactor must have a higher gradeability. To be able to efficiently crush rock and aggregate, the vibration crusher drum must move over the aggregate. This requires higher gradeability. The higher driving torque of the drum increases gradeability to up to 60 %.
Drive - 1 amplitude (preferred rotational direction)
I will tell you what additional technical features characterise the vibration compactor.
- Speed: 8 km/h (4.97 mph)
- Powerful 6-cylinder Deutz engine: 155 kW (208 HP) or 160 kW (215 HP)
- Adjusted software: due to the changed drum circumference and the more powerful hydraulics
- ASC: Anti-slip control prevents spinning of the drum/axle
- Hammtronic: Electronic machine management
- More powerful hydraulics/drum drive: Due to the higher load caused by the operating conditions
4. APPLICATIONS
Crushing
Good bearing sub-base: On good bearing sub-bases, the crushing performance is better as the rocks are less pressed into the sub-base (counterforce).
Less good bearing sub-base: On less good bearing sub-bases, the crushing performance is significantly lower as the rocks are pressed into the sub-base (no counterforce).
Functional principles of crushing
Crushing process under the drum
Due to the preferred rotational direction, the material is drawn under the drum. The main crushing process takes place under the drum.
Point load
Due to the small contact area of the tools, the vibration crusher drum can apply a point load of up to 50 t (110,230 lbs) during crushing.
Operating weight
The machine must have a high operating weight to absorb the forces that are generated.
Crushing video
The video shows the crushing process in slow motion.
Rocks are first brought into a stable position and get wedged. After that, the rocks are crushed by the cutting tools. This decreases the grain size and a higher compaction is achieved. Defined grain sizes are not created by the crushing with the vibration compactor.
Soil layers
The vibration compactor can work soil layers where no classified material is required because defined grain sizes are not created by the crushing with the vibration compactor. Hence, these primarily are layers below the planum or e.g. embankments.
Main areas of application
| Crushing and compacting of aggregate | Pre-crushing and releasing | Compacting of cohesive soils |
| Road construction, Embankment construction, Surface mining / mining (infrastructure), Foundation work, Construction of farming and forestry roads | Surface mining / mining, Tunnel construction, Rock construction | Road construction, Surface mining / mining (infrastructure), Earth work, Foundations, Construction of farming and forestry roads, Stabilising / recycling |
Examples
Crushing and compacting of aggregate at the Weibersbrunn construction site, A3 motorway
| Description | Material | Period of work | Requirement |
| Extension by third lane, 1,000,000 m³ of material crushed and compacted, Up to three machines used | Sandstone and mixed soil | 1.5 years | Crushing and compacting in one process, Load-bearing capacity of 45 MPa achieved |
Customer's benefit: Materials obtained on site could be used without treatment and transport.
Crushing and compacting of aggregate at the Hirschhagen tunnel construction site near Kassel
| Description | Material | Period of work | Requirement |
| New construction of a motorway. Approx. 1.8 million m³ of excavated material from tunnel construction. Direct use of the excavated material for the embankment | Lime sandstone (not weathered and of low porosity but highly pressure-resistant) | 6 months | Crushing and compacting of 60 cm thick layers. Crushing to a maximal grain size of 200 mm |
Customer's benefit: No use of additional equipment for the preparation of materials
Pre-crushing and releasing at the Großbreitenbach tunnel project
| Description | Material | Period of work | Requirement |
| New construction of a tunnel. Removal of the floor by milling (blasting not allowed) | Slate | 3 weeks | Pre-crushing and releasing of rock |
Customer's benefit: Increase of milling depth by up to 50%; reduction of cutting tool wear of the milling machine
Compacting of cohesive soil for the new construction of a railway line near Erlangen
| Description | Material | Period of work | Requirement |
| Production of a bearing sub-base for the subsequent construction of tracks using padfeet | Cohesive soil | Approx. 8 months | Compacting layer by layer of approx. 50 cm thick layers. 98 % density |
Customer's benefit: Required density achieved with only 8 passes
5. COST-EFFECTIVENESS
Economic efficiency - savings due to process slimming
Economic efficiency - savings potential after application
Rock crushing: Less or no transport of materials. No special material treatment. High-efficiency processes. Reduced times of tipper truck usage
Releasing: Increased milling depth, less passes, low wear (milling machine). Higher capacity utilisation (of the milling machine)
Compacting of cohesive soils: Higher capacity utilisation. Less standstill times. Compacting of layers up to 50 cm (19.7'')
Other costs: Lower consumption of diesel fuel (less machines used). Lower planning effort at the construction site. Low investments for machines. Lower cost of personnel
Economic efficiency - overview of the advantages
- Wide and new range of applications
- Lowest TCO (Total Cost of Ownership)
- High potential for savings
- Synergies within the Wirtgen Group
Economic efficiency - customer's benefit
The most important benefits to our customers are:
- One machine, various applications
- Costs saved due to optimisation of the construction site processes
- Simple and fast transport
- Up to 60 % gradeability
- Easy operation
- High crushing and compaction performance
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Tags: Hamm 3625 HT VC, hamm compactor, compactor with vibration crusher
