Application Specification for Crane Load Moment Indicator

1 GENERALINFORMATION Each crane is under a load chart that, in short, specifies the crane’s capabilities — detailing its features and how its lift capacity varies when considering distance and angle. LMI Using different sensing devices, the Load Moment Indicator monitors various crane functions and provides the operator with a continuous reading of the crane’s capacity. The readings continuously change as the crane moves through the motions needed to make the lift.LMI controls the lifting equipment to function as per the manufacturer's suggested safe load charts. Each of the measured parameters such as load charts, working radius, angle and extension of the crane boom, etc will then further be displayed in the operator's cabin. 2 SYSTEMDESCRIPTION The WANPULoadMoment Indicator consists of a central microprocessor unit,display, pressure transducers,length/angle sensor, and anti-two block switches The fixed data regarding the crane, such as capacity charts, boom weights, centers of gravity and dimensions are stored in memory chips in the central processor unit. This data is the reference information used to calculate the operating conditions. Boom length and boom angle are registered by the length/angle sensor, mounted inside the cable reel which is mounted on the boom. The boom length is measured by the cable reel cable which also serves as an electrical conductor for the anti two-block switches. The crane load is measured by pressure transducers attached to the piston and rod side of the hoist cylinders. The real value, resulting from the pressure measurement is compared with the reference data, stored in the central processor memory and evaluated in the microprocessor. When limits are reached, an overload warning signal is generated at the operator’s console

3 COMPONENTSOFTHELMISYSTEM 1 Display 2 Central Micro Processor Unit 3 Length/Angle Sensor 4 Pressure Transducers 5 Anti Two-Block Switch 6 Warning Light

3.2 CENTRAL MICRO PROCESSOR UNIT Core processing unit of LMI.Industrial-grade new-generation enhanced micro-processing chip, faster than the same processor Strong anti-interference ability and high efficiency.High strength chassis, good sealing, protection grade IP65, suitable for working in a variety of complex environments.

3.3 LENGTH/ANGLE SENSOR The length/angle sensor is installed on the boom of the crane, assisting the instrument control and display the length of the crane arm,lifting the arm relative to the horizontal

3.4 PRESSURE TRANSDUCERS For hydraulic cranes, the LMI reads its load value using a pair of pressure transducers, which read the cylinder pressure of the lift cylinders

3.5 ANTI TWO-BLOCK SWITCH Limit switch is used for lifting wire rope anti-volume limit an automatic electrical protection switch. It is an appropriate weight of the hammer supporting the use of hook up and down movement to hold up or disconnect or turn-on switch, put down the hammer to achieve the purpose of automatically cut off the hoist power supply connected braking system to limit rope over volume, and reach hook in the purpose of a certain height within the lift.

3.6 WARNINGLIGHT Three-color alarm suitable for larger machines. Increased visibility at great distances with a modular design.Three-color alarm series offers the latest in LED technology. Versatile and energy-efficient. 1.Application:Industrial safety equipment,maintenance of machine status 2.Making from noncombustible ABS,acidproof and dust proof 3.IP Rating:IP54 4.Different light source is available and adjustable,led 5.Integral alarm with adjustable volume up to 90db.