WEICHAI WP12 Engines for Concrete Mixers
Due to the special purpose and characteristics of theconcrete mixer,the
vehicle structure and engine performance have very special
requirements.Therefore, it is necessary to do a specialized match and research
on the concrete mixer.
Concrete mixer operating conditions
1. The transport area is between the suburbs and the citywith complex traffic
and relatively short transport distance.
2. Operating conditions can be divided into: Loading– Standard loading
transport - Wait for unloading –Empty loading backhaul
3. Single-way standard loading andsingle-way empty loading.
4. Engines tend to run with small engine load and low speed.
Concrete mixer operating characteristics and requirements
1. Long idling time: the time to wait for loading and unloading takes more
than 60% of the total running time.
Requirements: good idle speed performance (noise, vibration, fuel
consumption, etc.)
2. Complex road conditions.Flat road, pathway, etc.
Requirements: Large low-speed torquethat could adapt to various complicated
road conditions.Vehicle speedshould be under 60km/h.
3. Oncethe mixing stops, the concrete in the tank will be scrapped.
Requirements: particularly high reliability of the vehicle.
4. Fails need the shortest time for troubleshooting.
Requirements: timely service.
Concrete mixer development trends
Due to the requirements of operational efficiency and municipal restrictions,
following trends gradually appeared:
1. Mixerused for municipal renovationtends to have small tonnage (9 squaresor
less).
2. Mixer used on construction site tends to have large tonnage (9 squares or
more).
WP13 Series China Ⅲ / Ⅳ 480PS-550PS
Number of cylinders6
Bore / Stroke (mm)127/165
Displacement (L)12.54
Rated speed (r / min)1900/2100
Fuel systemElectronically controlled high pressure common rail
PTO maximumoutput torque1000N·m
WP12 Series China Ⅲ / Ⅳ336PS-480PS
Number of cylinders6
Bore / Stroke (mm)126/155
Displacement (L)11.596
Rated speed (r / min)1900/2100
Fuel systemElectronically controlled high pressure common rail
PTO maximum output torque 1000 N·m
WP10 Series China Ⅲ / Ⅳ Common Rail 270PS-375PS
Number of cylinders6
Bore / Stroke (mm)126/130
Displacement (L)9.726
Rated speed (r / min)1900 (2200)
Fuel systemElectronically controlled high pressure common rail
PTO maximum output torque600 N · m
WP7 series China Ⅲ / Ⅳ 210PS-300PS
Number of cylinders6
Bore / Stroke (mm)108/130
Displacement (L) 7.5
Rated speed (r / min) 2300
Fuel SystemEGR
PTO maximum output torque 500 N · m
Configuration features of engines for concrete mixer
1. Dedicated data
According to the demand, fuel injection system, intake and exhaust system and
electric control data were optimized and re-designed.
Low idle speed: 550rpm.Maximum torque is ≥ 700 N · m.
Low-speed area: 550-800rpm.Optimize fuel consumption and increase torque.
High-speed area: 1200-1800rpm.Optimize performance, reduce noise and
vibration.
2. Electromagneticthermostatic fan
- Effectively reduce the useless power consumption of the fan and reduce fuel
consumption.
- Engine heating up time is fast during the cold start, reducing the wearand
prevent lubricating oil burning caused by insufficient heating up
andinsufficient piston ring expansion.
- Greatly reduce fan noise and engine vibration, improving driving comfort.
- Quick respond and accurate temperature control.
- Stable driving performance, high reliability and long life.
3. Special fuel-water separator
- Fuel waxing problemin the high altitude area which resultsin difficultyof
starting or flameout after starting is solved.
- High failure rate of the gear caused by starter dragging the exhaust air
during getting off the assembling line or during maintenance is solved.
- Tedious manual oil pumpingwork to get the air out exhaust is now replaced.
4. WP multi-Power fuel-saving switch
- WP multi-power fuel-saving switch can meet customers’ power requirements
forempty load, medium load, overloading or any other road conditions and help
changing driver's driving habits.
- As concrete mixers have onlyoneway with load and no load when returning. The
multi-power switchcan save the fuel consumption by 2.6 liters / 100 km on
average.
Features of gas engines for concrete mixers
1.Higher reliability
a. Low temperature test:Under the environmentof Harbin,ECUwas able to
automatically correct ignition time, energy and gas supply under -35℃to ensure
low temperature start-up performance.
b. High temperature test: Whenthe temperature is45℃ in Turpan and the
engine surface temperatures is up to105℃, the electronic control unit is still
working properly.
c. High altitude test: at an altitude of 4700mon Kunlun Mountain,the
turbocharger is free of over-speeding or over-heating andthe power loss is
only12%
- Special piston
- Moldedpipeline
- Large-flow water pump
- Focuson the reliability optimization outcome of the basic engine model
2. Enhance economical performance
- Unique spoiler mixing technology
- Large flow mixer
- New air intake pipe design
- Intelligent ignition coil
- Special data matching
3. Power performance upgrade –low-speed high torque
- New turbocharger with higher reliability and better low-speed performance
- Low-speed torque is increased by 10%
4. Enhanced security
- High-grade fire retardant wirings
