XGMA XG6121D Double Steel Wheel Roller

●Traveling speed realizes stepless speed change

The driving hydraulic system is a closed circuit composed of a manual servo two-way variable plunger pump and two fixed plunger motors., The diesel engine drives the manual servo two-way variable plunger pump through the transfer case.,Two fixed plunger motors respectively drive the front and rear vibrating wheels to travel through the planetary reducer.。Push the handle of the manual servo valve on the drive pump,The road roller can realize stepless speed change and advance.、The function of retrogression。

●Double Steel Wheel、Dual drive、Double amplitude and three frequencies XG6121DDouble drive of front and rear wheel,Ensure that the roller has good driving performance,The two vibrating wheels are driving wheels.,And is favorable for improving the quality of the pavement.,Front and rear wheels vibrate(It is also possible to vibrate the front or rear wheels individually),And improve that work efficiency and the compaction quality.。 According to the literature,Compaction of Asphalt Pavement,The optimal amplitude is 0..4——0.8mm,The appropriate frequency is 33.——50HzWithin range,While for the compaction of the stable layer and the base layer，The appropriate amplitude is 1..5——2mm,Frequency is 25——30Hz，In order to adapt to the asphalt pavement、Compaction of stabilized layer and base layer, XG6121DThe amplitude of is determined to be 0..42mmAnd 0.9mm，The vibration frequency is set to 30；35；45Hz。

●Drive and brake interlock

XG6121D The series vibratory roller has successfully adopted the patented technology.——Walking hydraulic mechanism of road roller with operation protection device（Patent No：ZL 00 2 29863.5）,Interlocking protection of driving and braking of road roller can be realized，It works as follows.：

The drive pump is equipped with an electrically controlled brake valve,The brake valve is installed between the charge pump and the oil circuit of the manual servo valve.,When the brake valve coil is energized,The oil charge pump supplies oil to the manual servo valve and the brake oil chamber through the brake valve,The hydraulic thrust overcomes the spring force of the brake to release the brake,Push the handle of manual servo valve,The road roller realizes forward or backward running.;When the brake valve coil is de-energized,The oil supply to the manual servo valve and the brake oil chamber is cut off,The brake works under the action of spring force.,At this time, the oil supply of the manual servo valve is also cut off.,Even if the manual servo valve handle is pushed by mistake,The swashplate angle of the drive pump does not Chan,The displacement of the drive pump remains at 0,So that that problem that the oil temperature of the hydraulic system rise and even the hydraulic components are damage due to the high-pressure overflow of the driving hydraulic system caused by mistakenly operating the handle of the manual servo valve when the road roll is in a braking state is avoided。

●Reliable three-stage braking function

XG6121DThe tandem vibratory roller can effectively realize the function of three-stage braking，The service brake、Parking brake and emergency brake，It can ensure the effective braking of the road roller under various dynamic and static conditions.。

The drive hydraulic system is a closed circuit,When the manual servo valve handle on the drive pump returns to the neutral position,Center the swashplate of the drive pump,The displacement of the drive pump is zero,Drive hydraulic system neutral self-locking stop,Road roller to realize service braking。

The two planetary reducers that drive the front and rear wheels are equipped with multi-disc brakes.,When the diesel engine shuts down or the brake valve coil on the drive pump loses power,Brake oil chamber cut off,Play a braking role,Reliable parking brake of road roller。

When the service brake fails due to the failure of the road roller and an emergency occurs,Emergency braking measures can be taken.,The emergency stop switch is pressed,Power loss of brake valve coil on the drive pump,De-energize the brake oil chamber,Braking function of brake,Road roller to realize emergency braking;At the same time, the manual servo valve also makes the swash plate of the drive pump return to the center due to oil cut-off.,The displacement of the drive pump decreases to zero.,The safety of the man-machine is effectively protected.。

●Equipped with short-distance dragging device for easy operation

BecauseXG6121DIt is mainly applied to the compaction of asphalt pavement.,When the roller breaks down,It shall be towed away from the construction site in time.,So as not to affect the quality of construction and pavement, XG6121DThe driving hydraulic system can realize this function conveniently.。

When the roller breaks down(For example, the diesel engine cannot be started.)When unable to walk on its own,By operating a bypass valve mounted on the side of the drive motor,O that the high and low pressure oil chambers of the driving hydraulic system are communicated,Supply oil to the brake oil chamber by operating the hand pump,Leave the brake in the released state,Use other existing traveling machinery on the construction site for traction,Short distance dragging can be realized,Pull the failed roller away from the construction site in time.。

●Smooth start and stop of vibration

High grade highway has a high requirement for the smoothness of asphalt pavement.,Unevenness or cracking of the asphalt surface due to local over or under compaction of the asphalt pavement shall be avoided,Therefore, compaction equipment for asphalt pavement is required.─The start and stop of vibration of tandem vibratory roller shall be stable.。

BecauseXG6121DThe vibratory hydraulic system has a unique oil passage design.，The influence of hydraulic impact characteristics on the compacted material is greatly reduced.，So that that compaction performance is improve。

●Vibrating wheel can realize multi-frequency vibration

XG6121DThe vibration hydraulic system adopts double variable displacement piston pump and double fixed displacement piston motor system.。Vibration pump adopts double pumps in series，The displacement is controlled by the electric proportional valve.，Multiple frequencies can be realized，This machine uses three frequencies.。The front and rear wheel vibration hydraulic systems are independent closed hydraulic systems.，Can be separately controlled，It can realize the vibration of front and rear wheels simultaneously or any single wheel.。

●Start and stop of vibration、Sprinkler can be controlled automatically or manually

XG6121DVibration and sprinkling can be set in automatic control or manual control state according to work requirements.,Free switching between the two。In the automatic control state，According to the preset speed,When the travel speed of the roller reaches the set value,Automatic vibration and automatic watering;Vibration and watering can be stopped automatically when the driving speed of the road roller is reduced to the set value.。In the manual control state，It can be manually controlled according to actual needs.。

●Adopt the products of famous international companies

XG6121DDrive pump、Vibrating pump、The vibration motor is usedSAUER-SUNDSTRANDThe company's products,Vibrating bearings are usedSKFThe company's special vibration bearings,Sprinkler pump is usedFLOJETThe company's products,The drive motor and the planetary reducer adoptREXROTHThe company's products，Used for electrical instrumentsCURTISThe company's products，The battery is PentiumN120 solid battery。

Due to the extensive use of international advanced technology and products,, XG6121DTandem vibratory roller has superior performance.,High reliability and quality stability。