|Title of Invention
A RADIO REMOTE CONTROL SYSTEM FOR MOBILE EQUIPMENTS, LIKE LEVEL LUFFING CRANES
|A radio remote control system is provided for controlling mobile equipment like level luffing cranes. The system comprises a microcontroller based command unit for radio transmission of operational command for controlling the mobile equipment. An interface panel with a receiver circuit is provided for receiving and decoding the transmitted operational command and sending it to a programmable controller for controlling the crane movement according to the received command. The system also provides a carrier detection circuit for dropping the PLC power flowing through the carrier detect contact in absence of radio signal from the command unit.
|FIELD OF INVENTION
The present invention relates generally to a radio remote control system far a
mobftt equipment, like level luffing cranes. In particular it relates to a amaN,
rugged and cost effactive radio remote control system used mainly for controlling
level luffing cranes with a cordless control.
BACKGROUND OF THE INVENTION
Radio remote control system is being used for industrial applications and there
are several manu^turers of such systems world wide. With the advancement
of techncNogyf radio remote control system has undergone sevival changes in
terms of componente, circuit, frequency band, minlifeurintion, safoty foalures
Level luffing cranes are used for unloading of materiats from sMps. The time
kiken for unloading being important, it m«y somttimes be required to operate aH
the three motions of tfie aane together, namely luffing in / kiffbig out, slewing
left / slewing right and hoisting / towering.
There is therefore, a need to provkie a simple, tow coat radto remote control
system for controlling level luffing aanes.
SUMMARY OF THE INVENTION
Thus the main object of the present in»ention it to provide a cost effective smeH
end rugged radio remote control system for mobile equipment Mce e level Mfing
In the radio remote control system of the present swention for controNetg the
operation of level kiflfing aane comprists a cordless control unit caMad a hand
held tnrminal (HHT) and an intarfoce panel. The hand held terminal (HNT) is
designed to operate with a two axis joystick and petKH type batteries. The hand
held terminel transmite command signals, for conhroWng the operation of the
crvw whkh ya racaivad by the interfxa panel.
I nus me present eivenoon provioes a raoio remon convoi syssem lor a mooiie
equipment, Uke level luffing cranes comprising: a miaro-cenlroller beeed
commend unit for radio transmission of operational command; and an kitarfke
panel with a receiver circuit for receiving and decoding the transmMted
operational command and conb'oNing the crane movement according to Ifie
The system of the present invention wiN now be desai>ed in detail wNh
reference to the eccotnfMnying drewirtQ where
Figure 1 shows the interfece panel of the system of present invention wHh a
The hand held lenninai is a micro'ConlroMr based nteNipenk comniand unit, ft
consists of a processor card aikl a keyboard PCB. The processor card is baaed
on nc 16F877 processor. The PIC 16F877 processor is in the femlly of PIC 16F.
The job of the processor card is to read the keytward, encode the data for a
faithfui radio transmission and transmit the same over radio data Mnk. Ipi Ms
complete process kyw power modular radto in the UHf band has bean ustd.
me ffnariace penet siae, a receiver cvcuic nes oeen proviseci lor oeceaeip sw
signal, tranimittad t>y the hand hekt terminal. The decoded signal is suitably
converted to RS232C level signal and sent to a programmable conlf oiler of the
interfece perwi. The programmable controller is used to decode the signal and
conbrols the crane movement, according to the command of the hand heU
Uvti kiffing crants art diflirtnt from EOT aants. Tht thrtt motionf luffing,
slewing and hoisting can be dona aH togathar by using this radio ramote control
systam of the praaent invention.
The luffing action anatilas the aana to pick up and place the mafearial at a radiua
of 9m-32m. The two necessary operations of luffing are luff in and luff out.
Moving the first joyfticl( towards up/ down direction from the zero position wW
control the operation of kiff in / luff out. Four speeds are avaUaMe in both
upward / downward diractions. The canter / default / zero position of the
joystidc brings the crane to zero notch operation.
In the slewing operation the aane driver cal>in along wUh the Jfc can rotate up
to 360 dag. The two necessary operations of slewing me slew left and slaw
right. Moving the first joystick towards left / rij^ft direction from the zero
position will control the operation of slew left / slew right. Four speeds are
available in both left rif^ directions. The center / delMjIt / zero position of the
joystick brings the aane to zero notch operation.
The hoisting action is necessary for pkting up and bwaring down the matarlal.
Moving the second joystick towards up / down direction from the zero posllton
wiH control the operation of hoist / lowering. Four speads are avaikMe in both
upward / downward directions. The center / default / zero position of the
joystick brings tlie crane to zero notch operation.
Moving tht sacond joystick towards ktt/ri^ from zero position win control the
operation of grab open / grab close. Four speeds are available in both left and
right direction. The center / defwit / zero position of the joystick brings the
crane to zero notch operation.
For provkUng more protectnn in the system, a carrier_de|s£tiBQ.£|||lUp given.
This carrier detectkm circuit provides a potential free relay contact, that is
governed by the presence or absertce of radio signal in air. Thus under any case
if the hand hekJ termlftal is turned off, the carrier detect contact wM drop
thereby dropping aH of the programmable controller power ftowing through it.
The system of the present inventkm uses a specially devekiped communieatkin
protocol for radial data transmisskin by means of a simplex transmisston
^..-¦'fTfeShan^inT^eatures of this protocols are as follows:
Very compact data packet format and dgr of (simplex communic|flpD-j'
especially kir getting a real time operatfon.
Implementatfon of checksum foalure in the protocol for provkling safor
communicatfon between the transmitter and receiver.
Each system consists of af^ confJgurabJeJsystefnfejentityle&n protocol
at both transmitter and receiver ends. This provides safety \n the sense
that if the unit ID for transmKtsr does not match that of the receiver the
system stops fonctkNiing, even if the transmitter aid receiver are
communk^ating the data at same freauency. This means that the device
will not work with other hand held tenninals even if they are operating at
same frequency and communicating with the device.
1. A radio remote control system for a mobile equipment, like level
luffing cranes, characterized in that, said system comprises :
- a micro-controller based command unit for radio
transmission of operational command; and
- an interface panel with a receiver circuit for receiving and
decoding the transmitted operational command and sending
to a programmable controller for controlling the crane
movement according to the received command.
2. The system as claimed in claim 1, wherein said micro-controller
based command unit is a hand-held terminal.
3. The system as claimed in claim 2, wherein said hand-held terminal
comprises a processor card and a keyboard PCB for reading the
keyboard, encoding the keyboard data and transmitting the
encoded data over a radio data link.
4. The system as claimed in claim 3, wherein said micro-controller is based
on PIC 16F877 processor in the family of PIC 16F.
5. The system as claimed in claim 1, wherein said interface panel is
provided with a programmable logic controller for receiving and
processing the decoded command signal.
6. The system es claimed in claim 1, wherein said receiver circuit comprises
a radio module for receiving the operational command data transmitted
over the radio date link.
7. The system as claimed In claim 1, wherein said interface panel
provided with a relay drive unit for simultaneous controlling of eH three
crane motions, luffing, slewing and hoisting.
8. The system as claimed in claim 1, wherein said system Is provided with a
carrier detection circuitJor dropping the PLC power flowing through the
carrier detect contact in the absence radio signei from said command
9. Thw system as claimed in claim 1, wherein a simplex transmission
machanism is used for communication protocol and said systam
comprises a user configurable system identity set in protocol at both
transmitter and raceivar ends.
10. A remote control system for a mobile equipment, lice level luffing cranes
substantially as herein dascribed and illustrated in the accompanying
A radio remote control system is provided for controlling mobile equipment like level luffing cranes. The system comprises a microcontroller
based command unit for radio transmission of operational command for controlling the mobile equipment. An interface panel with a receiver circuit is provided for receiving and decoding the transmitted operational command and sending it to a programmable controller for controlling the crane movement according to the received command. The system also provides a carrier detection circuit for dropping the PLC
power flowing through the carrier detect contact in absence of radio signal from the command unit.
|Indian Patent Application Number
|PG Journal Number
|Date of Filing
|Name of Patentee
|THE TATA IRON AND STEEL COMPANY LIMITED
|RESEARCH AND DEVELOPMENT DIVISION JAMSHEDPUR - 831001
|PCT International Classification Number
|PCT International Application Number
|PCT International Filing date