Laser is a device that produce a very concentrated beam of light, which is single, very thin, high energy beam. A rotating laser light source is located somewhere in the field. As the laser rotates rapidly, a virtual “plane” of light is produced in the field. If the earthmover climbs over a high spot in the field, the blade will dig in as the receiver tries to stay locked on to the laser source. When the earthmover goes over a low spot, the blade will lift, again keeping locked onto the laser source, and dump soil into the low spot. If the rotating source is tilted as per prescribed grade, a grade can be installed in the field. The control panel mounted on the tractor interprets the signal from the receiver and opens or closes the hydraulic control valve, which will raise or lower the bucket. Drag Bucket: The levelling bucket can be either 3-point linkage mounted with tractor . PUNNI Best laser Land Leveller in India
The laser transmitter is mounted on a tripod, which allows the laser beam to sweep above the tractor unobstructed with the plane of light above the field.
The laser receiver is an omni-directional receiver that detects the position of the laser reference plane and transmits these signals to the control box. The receiver is mounted on a manual/hydraulic mast attached to the drag bucket.
The control box accepts and processes signals from the laser receiver. It displays these signals to indicate the drag buckets position relative to the finished grade. When the control box is set to automatic, it provides electrical output for driving the hydraulic valve. The control box is mounted on the tractor within easy reach of the operator. The three control box switches are On / Off, Auto/ Manual, and Manual Raise/ Lower (which allows the operator to manually raise or lower the drag bucket).
Hydraulic Control System:
The hydraulic system of the tractor is used to supply oil to raise and lower the levelling bucket. As the hydraulic pump is a positive displacement pump and always pumping more oil than required, a pressure relief valve is needed in the system to return the excess oil to the tractor reservoir. If the relief valve is not large enough or malfunctions damage can be caused to the tractor’s hydraulic pump. The solenoid control valve controls the flow of oil to the hydraulic ram, which raises and lowers the bucket. The faster the ground speed, the faster the bucket will need to adjust. The rate at which the bucket will raise and lower is dependent on the amount of oil supplied to the delivery line.
How to level the land with laser land leveller:
Step-1:Ploughing the field: Plow the field preferably from the centre of the field outwards.
Step-2: Conducting a topographic survey: Once the field is ploughed, a topographic survey is conducted to record the high and low spots in the field. From the surveyed readings, the mean height of the field is established by taking the sum of all the readings and dividing by the number of readings taken. Then using a field diagram and the mean height of the field, a strategy to effectively move soil from the high to low areas is finalized.
Step-3:Levelling the field: The laser-controlled bucket should be positioned at a point that represents the mean height of the field. The cutting blade should be set slightly above ground level (1-2 cm). The tractor should then be driven in a circular direction from the high areas to the lower areas in the field. To maximize working efficiency, as soon as the bucket is near filled with soil the operator should turn and drive towards the lower area. Similarly, as soon as the bucket is near empty the tractor should be turned and driven back to the higher areas. When the whole field has been covered in this circular manner, the tractor and bucket should then do a final levelling pass in long runs from the high end of the field to the lower end