JPH08127490A - Radio data transmission type load measuring device - Google Patents

Abstract

PURPOSE: To perform display of a load display value in the vicinity of a worker without damaging workability and safety at a work site. CONSTITUTION: A radio data transmission type load measuring device comprises a load meter body 1 consisting of a hook member 4 to couple a load measuring body, a load meter 20 to measure the load or the tension of a load measuring body coupled to the hook member 4, and a transmitter 21 to effect radio transmission of measuring data of the load meter 20; and a load data receiving device 10 consisting of a receiver to receive load measuring data from the transmitter 21, and a load data display part 11 to display receiving data of the receiver.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for remotely displaying load data measured by a load cell.

[0002]

2. Description of the Related Art A load cell has been proposed which is inserted between a crane hook and a suspended load to measure the weight of the suspended load and to measure the tension of a wire.

This load cell has a load cell built in its housing, and displays load data measured by the load cell on a display arranged on the surface of the housing of the load cell.

[0004]

However, in the above conventional load cell, when the load cell is attached to a crane and used as a load cell, (1) the load cell is attached to a hook portion apart from the operator seat of the crane, The load display value is difficult to see from the driver's seat. (2) There is a problem that the load display value is difficult to see because the worker cannot approach the crane hook for safety.

Further, when a wire-type remote display device is provided in order to solve the above-mentioned problems, it is difficult to use because the cable length is limited, and there is a problem that the cable is entangled with the wire of the crane and is dangerous. To do.

The present invention has been made in view of the above circumstances, and a wireless data transmission system capable of displaying a load display value near an operator without impairing workability and safety at a work site. An object is to provide a load measuring device.

[0007]

According to the present invention, a hook member for connecting a load measuring body, a load meter for measuring the load or tension of the load measuring body connected to the hook member, and measurement data of the load meter. And a load data receiving device having a load meter main body having a transmitter for wirelessly transmitting the load, a receiver for receiving the load measurement data from the transmitter, and a load data display section for displaying the received data of the receiver. To prepare.

[0008]

The load data measured by the load cell body is wirelessly transmitted from the transmitter of the load cell body. The transmitted load data is received by the load data receiving device arranged at a position different from the position of the load meter main body, and is displayed on the data display unit.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the embodiments shown in the accompanying drawings.

FIG. 1 shows a case in which the present invention is applied to load measurement of a suspended load of a crane. When the load is measured, the load cell body 1 is hung by the upper hook 2 on the hook 3 of the crane. At the same time, the load measurement object 6 is hung on the lower hook 4 via the rope 5. The load cell body 1 has a built-in load cell. When the power source of the load cell body 1 is turned on in this state, the load of the load measurement object 6 is measured, and the measurement data is displayed on the load cell body 1. Displayed in part 7.

At the same time, the load measurement data is wirelessly transmitted by a transmitter incorporated in the load meter body 1.

The load data receiving device 10 comprises a load meter main body 1
The load data receiving device 1 receives the load measurement data sent from the side and displays it on the display 11.
0 has a built-in receiver and the like. The load data is printed by the printer 12 as needed.

FIG. 2 shows an example of the internal structure of the load meter body 1 and the load data receiving device 10.

The load cell main body 1 is obtained by adding a transmission device 21 for transmitting load data to the load cell 20 for measuring tension and weight. In this case, the transmitter 2
As shown in FIG. 1, 1 is attached to the rear surface of the load cell 20 by a plurality of screws. The transmitter 21 and the load meter 20 are signal-connected by one connector. That is, the transmitting device 21 can be easily attached to and detached from the load meter 20.

The transmission device 21 has a transmission control section 22 for performing various transmission controls and control in a power saving mode described later.
And analyze the numerical data sent from the load cell 20,
A data analysis unit 23 that sends the result to the transmission control unit 22 and a transmission modulation unit 24 that modulates the weight data that has been data-converted by the transmission control unit 22 into a carrier wave and transmits the carrier wave
And a transmitting antenna 25.

On the other hand, the load data receiving apparatus 10 includes a receiving antenna 13, a receiving demodulating unit 14 which demodulates a received radio wave and sends a detection output of the received radio wave to a data analyzing unit 15, and numerical values of a load meter by analyzing the received data. A data analysis unit 15 that converts the data into data and sends the data to the data display unit 11, a data display unit 11 including a liquid crystal panel that displays input load numerical data, and a printer for printing out the load numerical data and the like. 12, overall control of reception, power saving control (described later), printer control,
It has a reception control unit 16 for checking interference with other radio waves. The load data receiving apparatus 10 is provided with a plurality of receiving channels so that load data can be received from a plurality of load cell main bodies.

FIG. 3 shows the details of the components in the power saving mode on the side of the load meter main body 1. Power is supplied to various circuits of the load meter main body 1 by a power supply (battery) 30. The power saving mode switch 31 is a switch for selecting a power saving mode. When the switch 31 is off, the switch circuit SWa is on and a circuit portion related to the data transmission operation,
That is, the circuits in the transmission modulator 24 and the controller 35 are unconditionally connected to the power supply 40. On the other hand, when the power saving mode switch 31 is on, the switch circuit SWa is off,
The power supply to the circuits of the transmission modulator 24 and the controller 35 is controlled by turning on / off the switch circuit SWb. On / off of the switch circuit SWb is controlled by the power saving control unit 33.

The load data D measured by the load meter 20 and the load data immediately before stored in the memory (not shown) in the power saving control 33 are input to the comparator 32, and the comparator 32 outputs these data. Are compared with each other, and when the comparison result shows a mismatch, a mismatch signal is output to the power saving control unit 33. As described above, the comparator 32 detects a change in the load data D, and inputs a detection signal to the power saving control unit 33 when a change in the data is detected. The comparator 32 may output a detection signal when the load data D input from the load meter 20 is larger than the immediately preceding stored load data.

The transmission interval setter 34 sets a transmission interval for intermittent transmission in a power saving mode, which will be described later.
The transmission interval setting unit 34 sets an appropriate transmission interval such as once every 5 seconds or once every 10 seconds.

The power saving control unit 33 in the transmission control unit 22 performs power saving control described later by turning on the power saving mode selection switch 31. Further, the control unit 35 of the transmission control unit 22 executes various controls other than the power saving control, such as an operation of converting the signal obtained from the data analysis unit 23 into a signal for transmission and change setting of the transmission frequency.

The power saving control on the load cell body 1 side will be described below with reference to the flow chart of FIG.

When the power saving mode switch 31 is off, the switch circuit SWa maintains the on state, and as a result, power is continuously supplied to all circuits of the load meter body 1 including the circuits of the transmission modulator 24 and the controller 35. (Step 11
0). As a result, the load data measured by the load meter 20 is continuously transmitted by the transmitter 21.

On the other hand, when the power saving mode selection switch 31 is turned on, the switch circuit SWa is turned off (step 115). As a result, the power supply to the circuits of the transmission modulator 24 and the controller 35 is determined by the on / off state of the switch circuit SWb.

Further, the power saving control unit 33 which detects the closing of the power saving mode selection switch 31 operates as follows.

That is, in the power saving mode, the power saving control unit 33 outputs the load data D by the output of the comparator 32.
Is determined (step 120). Then, when the load data does not change for a predetermined time or longer (step 130), the switch circuit SWb is turned off, so that the circuits related to data transmission, that is, the circuits of the transmission modulator 24 and the controller 35 are turned on. The power supply is cut off (step 140). As a result, the load data is not transmitted from the load meter body 1. Of course, power supply to circuits other than circuits related to data transmission, such as load measurement, data monitoring, and data display, is performed normally. The power supply to the circuit portion related to the above data transmission is restored when the load data changes.

Next, in the power saving mode, when a change in the load data is detected, the power saving control unit 33 turns on / off the switch circuit SWb at the intervals set by the transmission interval setting unit 34, so that the transmission modulation unit 24. Power is intermittently supplied to the controller 35 (step 150). Thereby, the load data is intermittently transmitted at the set transmission interval.

The intermittent transmission operation by turning on / off the switch circuit SWb is continued for a predetermined time set in advance if the load data does not change (step 160,
170, 150). Then, when the intermittent transmission operation for the predetermined time is completed, the switch circuit SWb is turned off to suspend the data transmission operation until the next data change occurs (step 140).

If a change in the data is detected during the intermittent transmission, the intermittent transmission based on the changed load data is executed (steps 160, 150).

That is, in the power saving mode of the load meter main body side 1 according to this embodiment, the power is saved by the intermittent transmission operation by intermittent power supply to the circuit portion related to the transmission operation, and the load data does not change for a predetermined time or more. Power is saved by suspending the transmission operation.

The loader main body 1 side may perform unconditional intermittent transmission without detecting a change in data in the power saving mode. In the power saving mode, the transmission data may be transmitted continuously or intermittently for a predetermined time only when the data changes.

Next, FIG. 5 shows the details of the components related to the power saving mode on the load data receiving device 10 side. Power is supplied from the power supply (battery) 40 to each circuit of the load data receiving device 10. The power saving mode switch 41 is
A switch for selecting a power saving mode on the load data receiving device 10 side, a switch circuit SWc is on when the switch 41 is off, and a circuit related to the reception operation, that is, a circuit in the reception demodulation unit 14 and the control unit 44. Is unconditionally connected to the power supply 40. On the other hand, when the power saving mode switch 41 is on, the switch circuit SWc is off, and the power supply to the circuits in the reception demodulation unit 14 and the control unit 44 is controlled by turning on / off the switch circuit SWd. The power saving control unit 43 controls ON / OFF of the switch circuit SWd.

The reception interval setter 42 sets the reception interval at the time of intermittent reception in the power saving mode. However, in the on / off control at the time of such intermittent reception, the off time interval is variable, but the on time interval is fixed and the intermittent transmission 1
It is longer than the cycle. As a result, even when the intermittent reception is performed, the transmission data can be reliably received without synchronization between the transmission side and the reception side.

The power saving control unit 43 in the reception control unit 16 performs power saving control described later by turning on the power saving mode selection switch 41. In addition, the control unit 44 of the reception control unit 16 executes various controls other than the power saving control for each component in the load data receiving device 10.

The power saving control on the load data receiving device 10 side will be described below with reference to the flowchart of FIG.

When the power saving mode switch 41 is off, the switch circuit SWc maintains the on state, and as a result, power is supplied to all circuits of the load data measuring device 10 including some circuits of the reception demodulation unit 14 and the control unit 44. It is continuously supplied (step 210). As a result, the load data receiving device 10 continuously executes the receiving operation.

On the other hand, when the power saving mode selection switch 41 is turned on, the switch circuit SWc is turned off (step 220). As a result, power is supplied to the circuits in the reception modulator 14 and the controller 44 by the switch circuit SWd.
Is determined by the on / off state of.

Further, the power saving control section 43 which has detected the closing of the power saving mode selection switch 41 operates as follows.

That is, in the power saving control section 43,
It is determined whether or not the received data is continuously input (step 230). If the determination result is YES, the switch circuit SWd is turned on to continuously execute the receiving operation (step 240). On the other hand, if the determination result is NO, the power saving control unit 43 determines whether or not the received data is intermittently received at a predetermined cycle (step 25).
0).

If the determination result is YES, the power saving control unit 43 determines whether the intermittently received data has the same value for a preset predetermined time or longer (step 260). If the data is not the same, the switch circuit SWd is turned on to continuously execute the receiving operation (step 240).

When the intermittent reception of the same data continues for a predetermined time or more, the switch circuit SWd is turned on / off at the time interval set by the reception interval setter 42 to execute the intermittent receiving operation. (Step 280).

Even when the received data is not received for a predetermined time or more (step 270), the switch circuit SWd is controlled to be turned on / off at the time interval set by the reception interval setter 42, thereby performing intermittent reception. The operation is executed (step 280).

In this intermittent receiving operation, when the received data is continuously input, or when a change in the received data occurs, the normal continuous receiving state is restored.

That is, in the power saving mode of the load data receiving apparatus 10 according to this embodiment, when the same load data is input for a certain time or more in a state where the received data is intermittently received, or the received data is received for a certain time or more. If not, power is intermittently supplied to the circuit portion related to the reception operation to save power.

In the power saving mode on the load data receiving device 10 side, when the power saving mode selection switch 41 is turned on, the intermittent reception may be unconditionally performed.

By the way, in the load data receiving device 10, in case a plurality of load cell main bodies 1 are used,
It has the following radio wave interference check function (used channel identification function). That is, when there is a load cell main body 1 to be newly installed for which radio wave interference is to be checked, data is intentionally transmitted from all the other load cell main bodies 1 that are already installed at present. In this state, the load data receiving device 10 is set to the test receiving mode.

As a result, the load data receiving apparatus 10 automatically scans all the receiving channels (NO1 to NO99), selects the channel on which the signal is received, and selects the selected channel number from its receiving intensity (0 to 9). ) Is displayed on the data display unit 11. By seeing this display, the operator can recognize a channel that does not have an impression on the receiver. Therefore, an appropriate channel that does not have an impression can be used as a channel of the load cell main body to be newly installed. . In this case, a channel having no reception sensitivity may be automatically selected and displayed.

The fields of application of the present invention include products and
Raw material weight measurement, packing weight measurement, scrap steel weight measurement, wire rope tension measurement, conveyor belt tension measurement, guide rope tension measurement for civil engineering construction, wire tension measurement, winch traction force measurement, tugboat traction force There is safety management such as measurement and crane.

[0048]

As described above, according to the present invention,
Since the load data measured by the load cell main unit is wirelessly transmitted, and this load data is received by the load data receiving device configured in a housing different from the load cell main unit and displayed, the load measurement data can be processed. It can be displayed at any position near the person, and the workability or safety at the work site is not impaired.

[Brief description of drawings]

FIG. 1 is a diagram showing an embodiment in which the present invention is applied to load measurement of a crane.

FIG. 2 is a diagram showing an internal configuration of a load meter main body and a load data receiving device.

FIG. 3 is a diagram showing a configuration example relating to a power saving mode on a load cell main body side.

FIG. 4 is a flowchart showing an operation in a power saving mode on the load cell main body side.

FIG. 5 is a diagram showing a configuration example relating to a power saving mode on the load data receiving device side.

FIG. 6 is a flowchart showing an operation in a power saving mode on the load data receiving device side.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Load cell main body 7 ... Display part 10 ... Load data receiving device 11 ... Indicator 14 ... Reception demodulation part 20 ... Load cell 21 ... Transmitting device 24 ... Transmission modulating part 30 ... Power supply (battery) 31 ... Power saving mode selection switch 32 ... Comparator 33 ... Power saving control unit 34 ... Transmission interval setting device 40 ... Power source (battery) 41 ... Power saving mode selection switch 42 ... Reception interval setting device 43 ... Power saving control unit

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[Procedure amendment]

[Submission date] October 31, 1994

[Procedure Amendment 1]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 3

[Correction method] Change

[Correction content]

[Figure 3]

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display location G08C 17/00

Claims (5)

[Claims] 1. A hook member for connecting a load measuring body, a load meter for measuring the load or tension of the load measuring body connected to the hook member, and a transmitter for wirelessly transmitting the measurement data of the load meter. A load cell body having, a receiver for receiving load measurement data from the transmitter,
A wireless data transmission type load measuring device comprising: a load data receiving device having a load data display section for displaying the received data of the receiver; 2. A power saving mode switch, and when the power saving mode switch is not turned on, continuously transmits the measurement data of the load meter, and when the power saving mode switch is turned on, the measurement data of the load meter is set to a predetermined value. The wireless data transmission type load measuring device according to claim 1, wherein the load meter main body is provided with a transmission control means for performing transmission control for intermittently transmitting at a time interval. 3. The wireless data transmission type load measuring device according to claim 2, wherein the transmission control means includes setting means for variably setting a time interval of the intermittent transmission. 4. A power saving mode switch and, when the power saving mode switch is not turned on, continuously receives the measurement data of the load meter, and when the power saving mode switch is turned on, the measurement data of the load meter is intermittently received. The wireless data transmission type load measuring device according to claim 1, wherein: the load data receiving device is provided with a reception control means for performing reception control for receiving the load data. 5. The wireless data transmission type load measuring device according to claim 4, wherein the reception control means includes setting means for variably setting the time interval of the intermittent reception.