Classifications

• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04Q—SELECTING
  • H04Q9/00—Arrangements in telecontrol or telemetry systems for selectively calling a substation from a main station, in which substation desired apparatus is selected for applying a control signal thereto or for obtaining measured values therefrom
• • G—PHYSICS
  • G08—SIGNALLING
  • G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
  • G08C17/00—Arrangements for transmitting signals characterised by the use of a wireless electrical link
  • G08C17/02—Arrangements for transmitting signals characterised by the use of a wireless electrical link using a radio link
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04Q—SELECTING
  • H04Q2209/00—Arrangements in telecontrol or telemetry systems
  • H04Q2209/40—Arrangements in telecontrol or telemetry systems using a wireless architecture
  • H04Q2209/43—Arrangements in telecontrol or telemetry systems using a wireless architecture using wireless personal area networks [WPAN], e.g. 802.15, 802.15.1, 802.15.4, Bluetooth or ZigBee

Definitions

• the present invention relates to a load cell indicator system using Bluetooth and, more particularly, to a load cell indicator system using Bluetooth, in which a load cell and an indicator are connected to each other using Bluetooth to transmit/receive data through wireless communication and data values about the total physical quantity of a to-be-detected object are measured using at least one load cell.
• a currently used load cell detection and indication apparatus is one adapted to measure force or pressure.
• a load cell and an indicator are connected to each other using a wire such as a cable to display a data value detected by the load cell on the indicator through the cable or display the data value on the indicator using RF wireless communication.
• a to-be-detected object of the load cell is weight values.
• the load cell should detect values ranging from several tons to hundreds tons, the distance between the load cell and the indicator reaches 20 to 30 m, and a cable connecting the load cell to the indicator has a length one and a half times its length actually required for connecting the load call and the indicator. Ac ⁇ cordingly, resources and manpower are wasted when the cable is installed and accidents may occur.
• the present invention has been made to solve the above-mentioned problems occurring in the prior art, and it is an object of the present invention to provide a load cell indicator system that measures data values corresponding to physical quantity such as weight or pressure using load cells in the industrial on-site and displays the data values on an indicator, in which transmission and reception of the data values are carried out through wireless communication using Bluetooth and data values respectively measured using at least one load cell are processed to produce data values corresponding to the total physical quantity of a to-be-detected object.
• a load cell indicator system using Bluetooth comprising: load cell transmission means for measuring physical quantity of a to-be-detected object using one or more load cells and transmitting a data value corresponding to the physical quantity through wireless communication using Bluetooth; an indicator reception means for receiving the data value transmitted from the load transmission means through wireless communication using Bluetooth, displaying the physical quantity of each load cell transmitted from each load cell, displaying the total physical quantity corresponding to the sum of physical quantities of respective load cells, transmitting the total physical quantity through an external computer connecting port, and outputting a relative proportional control value of the total physical quantity; and external display means for receiving the total data value of the to-be-detected object, displayed on the indicator reception means, using Bluetooth and displaying the total data value on a display.
• a relay connected with each load cell is interrupted to stop the operation of an external device connected to the relay and, simultaneously, generate an alarm sound.
• the present invention provides the load cell indicator system using according to the present invention including: load cell transmission means for measuring physical quantity of a to-be-detected object using one or more load cells and transmitting a data value corresponding to the physical quantity through wireless communication using Bluetooth; an indicator reception means for receiving the data value transmitted from the load transmission means through wireless communication using Bluetooth, displaying the physical quantity of each load cell transmitted from each load cell, displaying the total physical quantity corresponding to the sum of physical quantities of respective load cells, transmitting the total physical quantity through an external computer connecting port, and outputting a relative proportional control value of the total physical quantity; and external display means for receiving the total data value of the to-be-detected object, displayed on the indicator reception means, using Bluetooth and displaying the total data value on a display.
• load cell transmission means for measuring physical quantity of a to-be-detected object using one or more load cells and transmitting a data value corresponding to the physical quantity through wireless communication using Bluetooth
• an indicator reception means for receiving the data value transmitted from the load transmission means through wireless communication using Bluetooth
• the load cell transmission means may include: a load cell sensor; a signal amplifier for amplifying a weak electric signal transmitted from each load cell of the load cell sensor to a predetermined voltage; an A/D converter for converting the analog signal transmitted from the signal amplifier into a digital signal that can be recognized by a controller; a controller for supplying a control signal to transmit the digital data converted by the A/D converter to the indicator reception means through a communication unit, the controller applying the control signal to corresponding components to control them to amplify an analog signal value detected by the load cell sensor to a predetermined voltage and convert the amplified signal value into digital data; and a communication unit for performing wireless bidirectional communication with the indicator reception means using Bluetooth.
• the indicator reception means may include: a communication unit A for performing wireless bidirectional communication with the load cell transmission means using Bluetooth; a load cell display unit for displaying the data value detected by each load cell of the load cell sensor; a general display unit for displaying a data value with respect to the total physical quantity, which corresponds to the sum of data values detected by respective load cells; a relay output unit for operating a relay of the load cell display unit to control it when the displayed value of each load cell is overloaded as compared to a predetermined value; an alarm sound output unit for generating an alarm sound when the displayed value of each load cell is overloaded as compared to the predetermined value; a 4-2OmA output unit for outputting the relative proportional control value of the total physical quantity to control an external output device; an RS232 output unit for connecting the indicator reception means to an external computer to output a predetermined signal; a communication unit B for performing wireless bidirectional communication with the external display means using Bluetooth; and a controller for controlling the overall operation of the components.
• a communication unit A for performing wireless bidirectional
• the external display means may include: a communication unit for performing wireless bidirectional communication with the indicator reception means using Bluetooth; a controller for supplying a control signal to a corresponding component to receive the total data value of the to-be-detected object transmitted from the indicator reception means and display the total data value; and a display for displaying the total data value of the to-be-detected object.
• the load cell includes one to four load cells
• the external device connected to the relay is a hoist, a crane or a PLC.
• the external output device includes a PLC.
• the present invention enables transmission of data between a load cell and an indicator through wireless communication using Bluetooth such that data values cor ⁇ responding to total physical quantities of a to-be-detected object can be rapidly displayed.
• the present invention can reduce waste of cost and manpower required for installation of cables used to connect the load cell to the indicator and protect workers from accidents occurring in the industrial on-site using a crane or a hoist.
• FIG. 1 is a block diagram of a load cell transmitter applied to the present invention
• FIG. 2 is a block diagram of an indicator receiver applied to the present invention.
• FIG. 3 is a block diagram of an external display device applied to the present invention. Best Mode for Carrying Out the Invention
• FlG. 1 is a block diagram of a load cell transmitter 10 applied to the present invention
• FlG. 2 is a block diagram of an indicator receiver applied to the present invention
• FlG. 3 is a block diagram of an external display device 30 applied to the present invention.
• the load cell indicator system includes the load cell transmitter 10 having at least one load cell 11a that directly detects physical quantity of a to-be-detected object such as weight or pressure and transmitting a data value corresponding to the detected physical quantity, the indicator receiver 20 receiving the data value corresponding to the physical quantity detected by each load cell 11a and the total physical quantity by wireless to display the data value and displaying various output signals based on information values, and the external display 30 displaying data values corresponding to the total physical quantity finally processed.
• the load cell transmitter 10 having at least one load cell 11a that directly detects physical quantity of a to-be-detected object such as weight or pressure and transmitting a data value corresponding to the detected physical quantity
• the indicator receiver 20 receiving the data value corresponding to the physical quantity detected by each load cell 11a and the total physical quantity by wireless to display the data value and displaying various output signals based on information values
• the external display 30 displaying data values corresponding to the total physical quantity finally processed.
• the load cell transmitter 10 transmits detected data values to the indicator receiver
• the load cell transmitter 10 includes a load cell sensor 11, a signal amplifier 12, an A/D converter 13, a controller 14, and a communication unit 15.
• the load cell sensor 11 includes at least one load cell 11a and measures physical quantity such as weight or pressure of the to-be-detected object.
• the load cell sensor 11 measures a resistance variation of a strain gauge according to an elastic variation of each load cell 11a when specific external force is applied thereto, converts the magnitude of force into an electric signal and transmits the electric signal to the signal amplifier 12.
• the signal amplifier 12 amplifies the electric signal transmitted from each load cell
• the electric signal of the load cell 1 Ia is amplified to a voltage of 0 to 5 V through an amplifier OP 177 [AMP] and transmitted to the A/D converter 13.
• the A/D converter 13 converts the analog signal transmitted from the signal amplifier 12 into a digital signal that can be recognized by the controller 14 .
• the A/D converter 13 processes the analog signal through 12bit operation to convert the analog signal into a digital signal indicative of digital data of 0 to 4095 and transmits the digital data to the controller 14.
• the controller 14 receives the digital data processed by the A/D converter 13 using a microprocessor and transmits the digital data to the indicator receiver 20 through the communication unit 15 by wireless communication.
• the controller 14 applies control signals to the corresponding components to control them such that the electric analog signal corresponding to the data value detected by each load cell 1 Ia of the load cell sensor 11 is amplified to a predetermined voltage, converted into a digital signal value and transmitted by wireless communication.
• the communication unit 15 enables wireless communication using Bluetooth and uses a microchip transceiver capable of transmitting and receiving data at an available frequency band of 2.4GHz.
• the communication unit 15 carries out wireless bidi ⁇ rectional communication with a communication unit A 21 of the indicator receiver 20 such that the data values detected by the load cell sensor 11 can be transmitted to the indicator receiver 20 through wireless communication.
• the indicator receiver 20 receives the data values transmitted through wireless com ⁇ munication from the load cell transmitter 10 and proportionally displays the data values.
• the indicator receiver 20 includes communication units A and B (21 and 29), a controller 22, a load cell display unit 23, a general display unit 24, a relay output unit 25, an alarm sound output unit 26, an RS232 output unit 27, and a 4-2OmA output unit 28.
• the communication unit A 21 enables wireless communication using Bluetooth and uses a microchip transceiver capable of transmitting and receiving data at an available frequency band of 2.4GHz.
• the communication unit A 21 receives the data values transmitted through wireless communication from the load cell receiver 10 and transmits the data values to the controller 22.
• the controller 22 displays the data values transmitted from the load cell transmitter
• the controller 22 displays the data value detected by each load cell 1 Ia on the load cell display unit 23. In addition, the controller 22 calculates the total data value corresponding to the sum of data values detected by one or more load cells 1 Ia to display the total data value.
• the controller 22 applies control signals to the relay output unit 25, alarm sound output unit 26, RS232 output unit 27 and 4-2OmA output unit 28 in response to the data values displayed on the display unit 23 to control the output units to output corresponding output signals.
• the load cell display unit 23 includes one or more display units to display the data value detected by each load cell 1 Ia of the load cell sensor 11 on the corresponding load cell display unit 23.
• the general display unit 24 displays the sum of the data values detected by the load cells, calculated by the controller, as the total data value of the to-be-detected object.
• the relay output unit 25 allows a relay of each load cell display unit 23 to operate to cut power or control weight by magnetic holding when the displayed value of each load cell 1 Ia is larger than a set value to become overload.
• the alarm sound output unit 26 forms a buzzer such that the buzzer is operated to generate an alarm sound when the displayed value of each load cell 1 Ia is larger than the set value to become overload.
• the RS232 output unit 27 connects the indicator receiver with an external device such as a computer such that, when overload or alarm is generated, data about the overload or alarm is input to the computer to confirm it through the computer.
• the 4-2OmA output unit 28 controls an external PLC or other output devices.
• the 4-2OmA output unit 28 outputs a relative proportional control value of the total physical quantity. Specifically, the 4-2OmA output unit 29 outputs 4mA when the total physical quantity is 0, 2OmA when the total physical quantity is a maximum value, and a relative proportional value of a specific value of 4 through 20 when the total physical quantity is a value between 0 and the maximum value.
• the communication unit B 29 enables wireless communication using Bluetooth and uses a microchip transceiver capable of transmitting and receiving data at an available frequency band of 2.4GHz.
• the communication unit B 29 can transmit the data value corresponding to the total physical quantity of the to-be-detected object, displayed on the general display unit 24, to the external display device 30 through wireless com ⁇ munication between Bluetooth modules.
• the external display device 30 receives the data value of the to-be-detected object transmitted from the indicator receiver 20 and displays the data value.
• the external display device 30 includes a communication unit 31, a controller 32, and a display 33.
• the communication unit 31 enables wireless communication using Bluetooth and uses a microchip transceiver capable of transmitting and receiving data at an available frequency band of 2.4GHz.
• the communication unit 31 receives the data value transmitted from the indicator receiver 20 by wireless and transmits the received data value to the controller 32.
• the controller 32 applies a control signal to the communication unit 31 to control it to receive the total data value transmitted from the indicator receiver 20.
• the controller 32 applies a control signal to the display 33 to control it to display the data value received through the communication unit 31.
• the display 33 displays the detected total data value of the to-be-detected object such that it can be used when the data value detected by the load cell transmitter 10 is not distinctly viewed from afar or the data value is required to be confirmed at multiple points.
• load cell indicator system using Bluetooth can be used to measure physical quantity such as pressure or weight in various industrial fields
• the operation of the load cell indicator system using Bluetooth when the system is used for measuring the weight of a detection object of a load cell in a hoist or crane field is described hereinafter.
• the controllers When force is applied to the load cell 1 Ia of the load sensor 11, located in at least one region of the to-be-detected object, an elastic variation of the load cell sensor 11 is measured through resistance varied in a stain gauge to detect a weight value corresponding to physical quantity of the to-be-detected object. The magnitude of force is converted into an electric signal.
• the signal amplifier 12 OP 177 [AMP] amplifies the electric signal to a predetermined voltage because the electric signal sent from each load cell 1 Ia of the load cell sensor 11 is very weak.
• the analog signal amplified by the signal amplifier 12 is processed through 12-bit operation by the A/D converter 13 to be converted into a digital signal of 0 to 4095, which is a binary value recognizable by the controller 14.
• the digital signal is transmitted to the controller 14.
• the controller 14 applies a control signal to the com ⁇ munication unit 15 to control it to transmit the data value sensed by the each load cell 1 Ia of the load cell sensor 11 by wireless communication to the indicator receiver 20.
• the indicator receiver 20 receives the data value of the to-be-detected object transmitted from the load cell transmitter through the communication unit A 21 and displays the data value.
• the controller 22 of the indicator receiver 20 applies a control signal to the load cell indicator 23 to control it to display the data value detected by each load cell 1 Ia of the load cell sensor 11 on the one or more load cell display units 23.
• the controller 22 controls the general display unit 24 to display the total data value with respect to the weight of the to-be-detected object, which corresponds to the sum of the data values detected by the load cells 1 Ia of the load cell sensor 11.
• the displayed values can be output in various forms.
• a relay is operated to cut power or the operation of the load cell display unit 23 is stopped through magnetic holding using the relay output unit 25 of each load cell display unit 23.
• the buzzer is operated to generate an alarm sound through the alarm sound output unit 26.
• the controller 22 supplies a control signal to the communication unit B 29 to transmit the total data value with respect to the weight of the to-be-detected object, displayed on the general display unit 24, to the external display device 30 through wireless communication.
• the external display device 30 receives the data value by wireless from the indicator receiver 20 through the communication unit 31 and displays the received data value with respect to the weight of the to-be-detected object on the display 33 under the control of the controller 32 such that the data value displayed on the display 33 can be used when the data value displayed on the general display unit 24 of the indicator receiver 20 is not clearly viewed or it is required to be confirmed at multiple points.
• the present invention transmits the data value with respect to physical quantity of the to-be-detected object, detected by the load cell transmitter 10, to the indicator receiver 20 through wireless communication using Bluetooth to display the data value.
• the present invention displays data values detected using one or more load cells 11a and, simultaneously, displays the total data value corresponding to the sum of the data values such that the data value corresponding to the total physical quantity of the to-be-detected object can be measured.
• the present invention enables transmission of data between a load cell and an indicator through wireless communication using Bluetooth so that data values can be rapidly confirmed.
• the present invention is applied to the industrial field using a crane or a hoist, manpower and cost required for installing cables can be reduced and accidents can be prevented that may occur when the cables are installed.
• the inventive load cell indicator system is an excellent technology that can be applied to all the industrial fields.

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• Engineering & Computer Science (AREA)
• Computer Networks & Wireless Communication (AREA)
• Physics & Mathematics (AREA)
• General Physics & Mathematics (AREA)
• Arrangements For Transmission Of Measured Signals (AREA)

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Citations (3)

• 2004
  • 2004-07-30 KR KR10-2004-0060106A patent/KR100533338B1/ko active IP Right Grant
• 2005
  • 2005-07-30 WO PCT/KR2005/002496 patent/WO2006011780A2/en active Application Filing

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