Mobile machines & lifting technology
Wear measurement in the bearing
In modern marine diesel engines, the crankshaft bearing is subject to regular maintenance intervals. For predictive maintenance, inductive sensors (eddy current sensors) are used to permanently monitor the bearing wear. Despite harsh ambient conditions such as high temperatures, lubricants and pressures, the sensors measure the bearing movement reliably in long-term use.
Recommended sensor technologyInductive sensors (eddy current) for displacement, distance & position
Piston position in the hydraulic cylinder
In modern hydraulic cylinders, the piston position is detected continuously. Therefore, inductive long-stroke sensors from Micro-Epsilon are used which are directly integrated in the hydraulic cylinder. Its robust design enables the sensor to provide stable measurement values despite pressure and oil.
Recommended sensor technologyinduSENSOR EDS
Position detection of the piston in the hydraulic cylinder
In order to detect the piston position of hydraulic cylinders, magnetostrictive and inductive sensors are directly integrated in the sensor. Therefore, the magneto-inductive sensor mainSENSOR is an alternative. The face-mounted magnet transfers its magnetic field to the piston rod. The sensor mounted outside then detects the magnetic field distribution along the rod and converts this into a linear output signal, which corresponds to the piston position.
Recommended sensor technologyMagneto-inductive distance sensors
Jib lengths of mobile cranes
The current jib length is important when calculating the torque of the load on the crane. This length is measured with an integrated draw-wire sensor. This simple and telescopic measuring principle makes wire sensors predestined for the task. The sensors can also be retrofitted.
Request download linksApplication "Measuring Jib extension on mobile cranes" (PDF, 173 KB)
Precision synchronized lifting system
Synchronized lifting systems enable the raising and lowering of heavy loads controlled for distance and force or the controlled forward feed of large components. To achieve this, eight or more cylinders are connected to a central high pressure hydraulic system (700 bar). The travel displacement of each individual cylinder must be measured as the actual value for the synchronized movement and supplied to the closed/open loop controller. Draw-wire displacement sensors of the wireSENSOR Series P60 are employed for this task.
Recommended sensor technologyWDS-P60 analog
Request download linksApplication "Precision synchronized lifting system" (PDF, 126 KB)
Displacement measurement on slag transporter
Draw-wire sensors are used to reduce the standstill time of slag transporters during the loading and unloading. They are installed on the tipping cylinder and the support cylinder. In this way, the signal of a limit switch no longer has to be waited for. Depending on the load state, the transporter can start the journey earlier. The sensor also withstands this demanding environment using a special case and wire extensions.
Request download linksApplication "Displacement measurement on slag transporter" (PDF, 164 KB)
Lift height of a catering vehicle
Catering vehicles play an important role in passenger air traffic. They are responsible for there being enough foodstuffs on board. It is especially difficult with the Airbus A380 to reach the loading hatch with the vehicle. Therefore, the load area of the scissor platform is also maneuverable. Draw-wire sensors are perfectly suitable for measuring this displacement.
Request download linksApplication "Positioning of catering trucks at Airbus A380" (PDF, 131 KB)
Rack control unit - lift height
The frequently used automatic rack control units make modern warehousing much easier. These units must automatically travel long distances and position the products with millimetre precision at the end. Modern optical laser sensors and also draw-wire sensors are used to monitor this movement. Draw-wire sensors are the more economical solution for distances up to 50 metres. Laser sensors which determine the distance using time of flight measurement are suitable for larger distances. Distances can be precisely measured and loads can be exactly positioned or delivered with their help.
Crane support distance
A truck-mounted crane is frequently the better solution in many cases where loads have to be lifted. As a mobile solution, safety also plays an important role here. Therefore a load torque limiter controls whether the crane can still lift or not. In order to ensure the maximum permitted load, the side crane supports must always be completely extended. If this would not be possible due to lack of space, the crane could not be put into operation. The dynamic process for measuring how far the crane supports have been extended facilitates a calculation of the permitted load capacity. Thus, the use of truck-mounted cranes can also be ensured where space is restricted..
Lift platform – lift height
Side supports against tipping over are installed for lift trucks and lift work platforms. The crane or the platform can only be put into operation when the supports are completely extended so that there is also no danger of tipping in the case of long extension frames. However, sometimes this is not possible for spatial reasons. Therefore draw-wire sensors from Micro-Epsilon are used for measuring how far the supports are extended. A dynamic load torque limit across the actual support area is thus produced. Redundant measurement is performed as this is a safety relevant measured value.
Lift platform - automotive
Short cycle times for the assembly are extremely important in automobile production. In order to design the optimum ergonomics for the worker, the vehicles are transported along the production line on lift tables. Depending on the work operation to be performed, the vehicles are moved to the optimum height in order to ensure as efficient working as possible. Which exact height has been reached is established using draw-wire sensors from Micro-Epsilon. Completely integrated in the lift table, they ensure more reliability and higher productivity.
Request download linksApplication "Height of lifting platforms on automobile production lines" (PDF, 116 KB)
Synchronized lifting system lift height
Mobile lifting jacks are being used more and more often for commercial and railed vehicles. The lifting jacks for commercial vehicles are often designed as column lifts. In contrast, railed vehicles are often lifted on the frame. Any number of these lifting jacks can be combined into one system. As each lifting jack has its own drive for the lifting movement, the individual devices must be synchronized in order to ensure a completely level and oscillation-free movement. The lifting movement of each lifting jack is measured with a draw-wire sensor for this.
Request download linksApplication "Lift height measurement on wheel gripper and lifting systems" (PDF, 117 KB)
Forklift lifting height
A large part of internal transportation is performed by forklifts. The risk of tipping the forklift when products are lifted is high. Therefore, the permitted speed has been restricted with limit switches. Draw-wire sensors from Micro-Epsilon measure the current lift height and make continuous speed regulation possible, depending on the height of the products.