Laser Guide car (LGVs)
Flexible automatic guide car in Zone (AGV)solution.
LGVs is a more flexible solution than the old form of AGVs, which follows the markings or wires on the floor, or the navigation is based on following the magnet debris trajectory.
LGVs can go through a facility on multiple paths and paths can be changed as needed.
This article explains how the "typical" LGV implementation will proceed and the steps involved.
Different suppliers of LGVs have slightly different approaches to laser navigation.
Mark Longacre explains that at JBT, LGVs has a navigation laser that usually rises 10 to 15 feet in the air and rotates a few laps per second. " Mr.
Longacre is the application engineering manager of JBT Corporation.
The range of the laser is 30 m and about 100 feet, which is an important factor because it limits the required infrastructure.
There is one in each car (or more)
These rotating laser sensors that interact with the target (
With reflective strips)
Install along the path.
The laser sensor receives the reflected signal and uses this data to make a triangular measurement of the position of the vehicle.
At JBT, the navigation algorithm recalculates the vehicle position 40 times per second, which means that the path correction remains small.
Create and change the virtual guide path in the layout Wizard Software.
In the JBT implementation, the target is usually installed on the column, alternating around every 50 feet or so.
These targets have a center, which is the center of a highly reflective, with a black quarter border around them.
The target needs to be accurately investigated in a facility.
Measure and locate the leftmost edge of the reflective surface and position it on a CAD drawing with accuracy typically within 1mm of what is shown on the drawing.
Measurement is done using a transport measuring tool, a photoelectric measuring instrument.
This is a precision optical instrument for measurement and you may have seen that it is being used to measure a property or construction site.
If the LGV will travel a relatively short distance in a simple cycle, the survey may be completed within four hours.
But in a large facility with an area that could reach 2 square miles, the survey could take about two weeks.
John Clark, a Dematic North American mobile automation product marketing company, agrees that the survey of the "average" project may take about two weeks.
Like JBT, Dematic is also one of the major suppliers of AGVs.
But he pointed out that AGV companies are very busy.
Once the AGV is ordered, delivery can take months.
Best of all, you will see the delivery in a few weeks.
Preliminary investigations can be conducted during vehicle construction.
Can you use the customer's drawings? Mr.
Dematic already knows they need to do their own research, Clark said.
The facility may have changed in some way, which may not be reflected in the current CAD in the file.
In addition to conducting a target survey, wireless infrastructure was investigated.
Reliable wireless coverage allows continuous communication between vehicles and fleet management software.
Reliable wireless coverage is also required if the vehicle is undergoing automatic barcode scanning or integrated into the warehouse management system.
For some LGV suppliers, a second survey may be conducted to verify the location of the initial target.
This is especially desirable if the LGV not only navigated based on XY coordinates, but also requires Z coordinates to accurately place the tray in the slot in the rack, or at the top of each other, or on the conveyor belt
Where this precision is required, the number of targets required will increase.
In a large warehouse that may have up to 2000 pallet placement locations, this survey may take two months.
The final step is integration testing.
Here, the vehicle is given a task and the project personnel ensure that the vehicle is able to reach its destination accurately from the starting point.
Depending on the number of paths and the difficulty of integrating into the warehouse management system, this test may take one to two days to three to four weeks.
So in all the steps, the customer is thinking about how long it will take to install it for a few months.
The return of any form of AGV is achieved by Saving Labor, as less time is wasted when crossing the facility.
Warehouses and factories in the rich western world find it increasingly difficult to hire workers.
This is the main reason why AGV is so busy.
Laser-guided vehicles may get less publicity than autonomous mobile robots (
We just finished a market study.
Because it's an old one (
But it also proved reliable)technology.
But technology is cool!