JPH0610477Y2 - Charge unit approach alarm - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention is designed to be installed in a mobile crane vehicle to carry out crane work in the vicinity of charging parts such as distribution lines and power transmission lines. The present invention relates to a charging unit approach alarm device that detects the voltage of a charging unit and issues an alarm in order to prevent an accident.

[Conventional technology]

A conventional charging unit approach alarm installed in a mobile crane is generally composed of a sensor unit attached to the tip of the boom of the mobile crane and an alarm unit installed in a place where a crane operator is present. In this way, the sensor section and the alarm section are installed at intervals corresponding to the distance.

[Problems to be solved by the device]

Since the conventional charging unit approach alarm is configured as described above, in such a conventional charging unit approach alarm,
Since the sensor section and the alarm section are respectively installed at a considerably long distance, the wiring of the power supply line to the sensor section, the signal line connecting the sensor section and the alarm section, and the like becomes very long, therefore There was a problem that it became complicated and the wiring work was very troublesome.

Also, set the sensitivity of the sensor unit to generate an alarm.
There was a problem that the setting operation was very complicated because it was done while operating in multiple steps by manual operation of the predetermined means, and in that case, the boom of the crane was actually approached to the position desired by the charging part. The alarm setting volume is adjusted so that an alarm (for example, an alarm sound) is emitted at that position. Therefore, there is a problem that the alarm setting operation is similarly complicated and troublesome.

The present invention has been made to solve such conventional problems, and charging for power line and signal line is simplified and the alarm setting operation of the alarm unit is also simplified. The purpose is to get a unit approach alarm.

[Means for solving problems]

The charging unit approach alarm device according to the present invention detects the induced voltage of the charging unit, converts it into a pulse having a corresponding frequency, sends it to the counting means through the power supply line, counts it, and presets the count value. The alarm value is compared and the alarm value is issued when the alarm value exceeds the count value, and the count value and the alarm value can be displayed so that the alarm value can be set manually by a switch. This makes it easier to do.

[Action]

The charging unit approach alarm device according to the present invention converts the induced voltage of the charging unit into a pulse having a corresponding frequency, superimposes the pulse on the power supply line to the sensor unit, returns the pulse, and counts the preset value. The alarm is issued by comparing with the alarm value. In addition, the count value and the alarm value are displayed,
The alarm value can be immediately set by manually operating the switch while confirming the display content of the alarm value.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. First
The figure is an overall block circuit diagram of the charging unit approach alarm. The alarm device is roughly divided into a sensor unit 1 attached to the boom of a mobile crane and an alarm unit 2 installed in the driver's seat where the crane operator is located.

The sensor unit 1 is a first channel ch1 installed at each of the front end and the middle part of the boom of the crane vehicle.
And detectors 11 which are two detectors for the second channel ch2 (only one detector is shown in the drawing),
An amplifier 12 for amplifying an induced voltage detected by the detector 11 such as a distribution line and a transmission line, and an amplifier gain for automatically switching the gain of the amplifier 12 according to the magnitude of the induced voltage at that time. Switching circuit 13, absolute value amplifier 1 for converting the output signal of the amplifier 12 into a DC signal
4. From the VF converter 15 and the alarm unit 2, which form a VF converter that converts the output signal of the absolute value amplifier 14 into a pulse having a corresponding frequency and sends the pulse to the alarm unit 2 via the power supply line 17. The voltage supplied through the power line 17 is ± 15V
Sensor power supply circuit for converting the voltage into ± 5 V and supplying it to each circuit 12 to 15 of the sensor unit 1 and driving the pulse to transmit the pulse to the alarm unit 2 via the power supply line 17. 16 and 16.

On the other hand, the alarm unit 2 includes a waveform shaping circuit 21 that shapes the waveform of the pulse, a counter 22 that constitutes counting means that counts the output pulse of the waveform shaping circuit 21, and an alarm for each of the first channel and the second channel. The count value of the digital switch 23 and the counter 22 which constitutes the alarm value setting means for setting the value by the manual operation of the switch and the alarm value set for each channel by the digital switch 23 are compared for each channel. 7-segment driver 2 which constitutes a comparator 24 which constitutes a comparison means and a display means which displays the count value and the alarm value.
5, 7-segment LED 26, this display means (25, 2
Based on the comparison result of the display switching circuit 27 and the comparator 27, the display content of 6) is switched to the channel side that requires the display when setting the alarm values of the first channel ch1 and the second channel ch2. A disconnection / short-circuit detection circuit for detecting disconnection short-circuit of the alarm driver 28, the speaker 29, the power supply line 17 and the signal line, which emits an alarm sound when the relation of count value ≧ alarm value is satisfied for each channel. 30,
The counter 23 includes a reference pulse generator 31 that supplies a reference pulse to the 7-segment driver 31.

The digital switch 23 is connected to the first channel c
It is composed of a digital switch 23-1 for h1 and a digital switch 23-2 for the second channel ch2.

Further, in FIG. 1, detailed circuits of the circuits 12 to 16 of the sensor unit 1 are shown in FIG. In this case, what is shown as blocks A, B, C and D in FIG. 1 corresponds to the circuits of the respective units of blocks A, B, C and D in FIG.

Further, in FIG. 1, each circuit 21, 22, 24, 3 of the alarm unit 2 is
The detailed circuit of 0 and 27 is shown in FIG. 4, and blocks E, F, G, H, and I in both figures correspond to each other. Further, in FIG. 1, each circuit 31 and 2 of the alarm unit 2 is
The detailed circuit of 5 and 26, 28 and 29 and 23 is shown in FIG. 5, and the blocks J, K, L and M in both figures correspond to each other.

Next, the operation will be described. First, the overall operation of the charging unit approach alarm device of this embodiment will be described with reference to the block diagram of FIG.
The detector 11 for the first channel ch1 and the detector 11 for the second channel ch2 of the sensor unit 1 attached to the tip end and the middle part of the boom of the mobile crane are charging parts for distribution lines, transmission lines, etc. The induced voltage from is detected. The detection voltage is amplified by the amplifier 12, and the absolute value amplifier 14
Is supplied to. In this case, the gain of the amplifier 12 is automatically switched to either 2 times or 20 times by the amplifier gain switching circuit 13 according to the magnitude of the detection voltage as described later.

The absolute value amplifier 14 converts the AC detection voltage from the amplifier 12 into a DC detection voltage and supplies the DC detection voltage to the VF converter 15.
Then, the VF converter 15 converts the input detection voltage into a pulse having a corresponding frequency, and supplies the pulse to the waveform shaping circuit 21 of the alarm unit 2 via the power supply line 17 to supply it to the post-waveform shaping counter 22. The counter 22 counts the input pulse, and the count value is 7 segment LED26.
Is displayed in.

In this case, with respect to the comparator 24, the digital switch 23-1 or 23-2 of each channel is previously provided for each of the first channel ch1 and the second channel ch2.
The alarm value is set manually by.
At this time, since the alarm value to be set is displayed on the 7-segment driver 26, it is possible to quickly set the required alarm value while observing it.

The display switching circuit 27 switches which channel the 7-segment LED 26 is to display.

In this way, the alarm value of each channel set in the comparator 24 and the count value of the counter 22 are constantly compared by the comparator 22, and when the relation of count value ≧ warning value is satisfied in any channel, Based on the comparison result signal, the alarm driver 28 causes the speaker 29 to emit an alarm sound to notify that the crane has approached the distribution line or the like from a distance corresponding to the alarm value set by the crane.

Next, the operation of each block A to M shown in FIG. 1 will be described with reference to FIGS.

In FIG. 2, the block A is composed of an amplifier 12 and an amplifier gain switching circuit 13. Then detector 1
The detection voltage of 1 is input to the operational amplifier OP1 via the filter Flt1. The gain of this operational amplifier OP1 is 2
It can be switched to either double or 20 times. This switching is performed by feedback resistors VR1, VR2, analog switch IC
1, IC2.

The block B is composed of an absolute value amplifier 14, and the voltage amplified by the amplifier 12 is AC-coupled by a capacitor C1. The AC signal input via the capacitor C1 is output to the output side of the operational amplifier OP3 as a voltage signal of equal size by the resistor R5. Since the voltage generated through the resistors R3 and R4 is an inverting input, the output of the operational amplifier OP2 has a minus half cycle. This voltage is output as a double voltage on the output side of the operational amplifier OP3 in relation to the resistors VR3 and VR4. However, because of the inverting input, its output voltage is plus half a cycle. As shown in FIG. 3, the two outputs are combined with the output waveform on the minus side and the plus output waveform of 2 times to form a plus half cycle waveform equal to the input waveform. The minus half cycle of the waveform of the input signal is applied to the operational amplifier OP3 via the resistor R5 and becomes a positive voltage when inverted.

On the other hand, the voltage applied to the resistors R3 and R4 is the operational amplifier OP2.
Is output to the output side as a positive side voltage, is fed back to the negative side input terminal of the operational amplifier OP2 via the diode D2, and is not given to the operational amplifier OP3. The output voltage of the operational amplifier OP3 is the capacitor C
Smoothed by 3.

The block C is composed of the VF converter 15. The voltage rectified by the absolute value amplifier 14 is a DC voltage, which is input to the IC 3 and converted into a pulse having a corresponding frequency. The duty ratio of this pulse is 1/2.

The block D is composed of the sensor power supply circuit 16 and applies the voltage supplied from the alarm unit 2 to the DC / DC converter DC / DC1.
Is converted to ± 15V by the three-terminal regulators Rg1 and Rg2 on the output side. The noise component of the voltage supplied from the alarm unit 2 is removed by the filter Flt4 and the capacitors C12 and C22. Then, the voltage is held at +12 V by the three-terminal regulator Rg3 and is applied to the DC / DC1. Further DC / DC1
The output voltage of is removed by its filters Flt2, Flt3 and capacitors C10 and C11.

IC4 is a comparator IC for switching the gain of the amplifier 12.
Is. The transistor Tr1 is a driver transistor, which amplifies the pulse from the VF converter 15 by current and sends it to the alarm unit 2.

The block E is the waveform shaping circuit 21. In FIG. 4, the current change of the pulse from the sensor unit 1 is represented by the resistance R
Converted to a voltage change by 1 and R2. The noise component of the pulse is cut by the filter Flt1 and the distortion of the waveform is reduced by the coil L1. Furthermore, the direct current component is cut off by the capacitor C1, and only the changed component is input to the base of the transistor Tr1 and amplified. The resistors R4 and R5 are resistors for biasing the transistor Tr1. The output of the transistor Tr1 is the capacitor C
Waveform distortion is corrected by 2 and Schmidt trigger IC
The pulse is shaped by the IC 18 which is

The block F is a counter 22. The pulse is then input to IC1. The entire counter 22 is an IC
Made up of cascade connections. And counter 2
When 2 overflows, the gain of the amplifier 12 of the sensor unit 2 is switched.

The block G comprises a comparator 24. As described above, the comparator 24 compares the alarm value set by the digital switch 23 with the count value of the counter 22, but when the count value becomes larger than the alarm value, the IC
12 outputs an alarm signal.

The block H constitutes a disconnection / short circuit detection circuit 30. Then, the voltage supplied to the sensor unit 1 is input to the ICs 16 and 17 which are comparator ICs, and disconnection or short circuit is detected.

Block I is a display switching circuit 27. A flip-flop is configured by the IC 15 to switch the display of ch1 and ch2.

Block J is a reference pulse generator. In FIG. 5, IC1 outputs a reference pulse of 10 Hz, for example. This reference pulse resets IC1 to IC4 of the counter 22 and simultaneously presets IC4 to IC7.
The IC 2 is a monostable multivibrator, and is used to improve the accuracy of the counter 22.

The block K constitutes a 7-segment driver 25 and a 7-segment LED 26.

The block L constitutes an alarm driver 28 and a speaker 29. In the figure, IC3 is an astable multivibrator.

The block M is a digital switch 23. The digital switch 23 is a thumb rotary switch, and a numerical value from 0000 to 1999 can be set as an alarm value.

[Advantage of the Invention] As described above, according to the present invention, the charging unit approach alarm device detects the induced voltage of the charging unit, converts the induced voltage into a pulse of a corresponding frequency, and counts it via the power supply line. And counts it, and compares the count value with a preset alarm value to issue an alarm when the alarm value exceeds the count value. Since the alarm value can be set and displayed easily by manual operation of the switch, the wiring work between the sensor unit and the alarm unit is simplified, and the alarm value setting work of the alarm unit is extremely easy. Therefore, there is an effect that the charging unit approach alarm can be easily installed and handled.

[Brief description of drawings]

FIG. 1 is a block circuit diagram of a charging unit approach alarm device according to an embodiment of the present invention, FIG. 2 is a detailed circuit diagram of the sensor unit 1, and FIG. 3 is an input waveform and output of an operational amplifier OP3 in the absolute value amplifier 14. Waveform diagrams showing waveforms, FIGS. 4 and 5 are detailed circuit diagrams of the alarm unit 2. 11 ... Detector (detection means), 15 ... V-F converter (V-
F conversion means), 17 ... power supply line, 22 ... counter (counting means), 23 ... digital switch (alarm value setting means),
24 ... Comparator (comparing means), 25 ... 7-segment driver, 26 ... 7-segment LED (25, 26 ... Display means), 28 ... Alarm driver, 29 ... Speaker (2
8, 29 ... Alarm means).

Claims (1)

[Scope of utility model registration request] 1. A detecting means for detecting an induced voltage by a charging section such as a distribution line and a transmission line, a VF converting means for converting the induced voltage detected by the detecting means into a pulse having a corresponding frequency, and The pulse from the VF conversion means is returned via the power supply line to the detection means, and the counting means for counting the pulse and the alarm value representing the count value of the counting means when the alarm is issued are set. Alarm value setting means, display means for displaying the count value and the alarm value, comparing means for comparing the count value and the set alarm value, and this comparing means for setting the count value as the alarm value A charging unit approach warning device, which is provided with a warning device that issues a predetermined warning when it detects that the battery has exceeded the limit.