JPS6223302A - Current collector of trolley-assisted vehicle - Google Patents

Abstract

PURPOSE:To prevent a defect from occurring due to driver's electric shock or impact by enabling to lift a pantograph only when the door switch of a driver's cab is closed in a nontrolley mode. CONSTITUTION:When the door of a driver's cab is closed and a mode changeover switch 5 is shifted to a nontrolley mode E side, a pantograph control (PC) relay 15 is energized. When the switch 5 is shifted to a trolley mode T side in this state, a pantograph-actuating solenoid valve 8 is energized to lift the pantograph. When the door is opened in the state that the switch 5 is shifted to the trolley mode T, any of door contacts 12, 13 is opened to deenergize the relay 15. Thus, the valve 8 is deenergized after a slight delaying time due to an OFF delay relay 30. Simultaneously, a collected current is reduced by a rectification controller.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to dump trucks used for transporting ore in large-scale mines, and is particularly useful in regions where electricity costs are low and fuel costs are high. In order to reduce the amount of fuel consumed, and in mines where exhaust gas pollution inside mining bits caused by dump trucks is a problem, 1. In order to reduce the level of exhaust gas emissions, stacking from the bottom of the bit to the outside of the bit, which consumes the most fuel, is recommended. On the course, the trolley-assisted dump truck runs on inexpensive external electricity collected from overhead wires (trolley wires), and on the reverse course, the trolley-assisted dump truck runs on its own engine.
This relates to the current collector of Rack 1.

(Prior Art) A conventional current collector of this kind of trolley-assisted vehicle is equipped with a pantograph operation circuit 1 as shown in FIG. When the vehicle arrives at the contact wire, the vehicle is caused to run in a trailing manner by a current collector drive circuit (not shown).

The pantograph operation circuit 1 uses a vehicle-mounted battery 4 as a power source.

This battery 4 controls the alternator driven by the diesel engine in the controller 1~roll circuit length for electric drive of the trolley assist vehicle (not shown) or the engine mode, so the mapi is connected to various electrical equipment at low voltage. It is also used as a toilet to supply power.

This pantograph operation circuit 1 operates when the mode selector switch 5 provided on the dashco board of the driver's cab is manually turned to the T side of the 1 trolley mode, the control relay immediately switches to the 5 trolley mode (T).
OR> When relay 6 is energized, contact 7 closes and energizes pantograph operation solenoid valve 8 (PVl, PV2), that is, energizes pantograph operation solenoid 8a, and pantograph operation valve 8
Activate b. As a result, pressurized fluid is introduced from the working fluid (eg, air) source 9 into the cylinder 10, and the link mechanism causes the pantograph 3 to rise and attach to the contact wire.

In this way, preparations for traveling in trolley mode can be made using the current collection drive circuit (not shown).

[-When the door switch 5 is turned to the E side of the engine mode, the TOR relay 6 is not energized, the relay contact 7 is opened, and the pantograph operation solenoid valve 8 (solenoid 8a and operation valve 8
b) is deenergized and the pressurized fluid in the cylinder is drained;
The pantograph descends and separates from the contact wire. At the same time, in the example shown in FIG. 1, an engine mode command is generated by the engine mode (ENG) relay 11, and preparations for self-propulsion in the engine mode are made using the onboard diesel engine via a control circuit (not shown).

However, in the circuit shown in Figure 1, the driver or tour conductor forgets to turn the mode selector switch to the E side (non-trolley mode) and leaves it in the T side (trolley mode), in other words, the pantograph is connected to the trolley line. If you try to get out of the vehicle with the wire attached to the dump truck, the driver or passenger will receive an electric shock because there is no guarantee that the potential of the vehicle body, which is electrically floating due to the rubber tie I7 of the dump truck, will be maintained at ground potential. There is a risk.

In general third-rail new transportation systems or trolleybuses that always run in trolley mode, f? When rolling, the vehicle body is grounded using the ground shoe described in Utility Model Publication No. 25-9721 or No. 26-4906 of the same town.

However, for trolley-assisted vehicles whose driving modes can be switched, especially the above-mentioned dump trucks, there is no need to consider the frequent boarding and alighting of general passengers at specified locations, such as in third-rail new transportation systems or trolleybuses, and unspecified Since it is generally assumed that only the driver or tour conductor gets on and off at a given point, measures are needed to allow only the driver or tour conductor of a trolley-assisted vehicle to get on and off at unspecified points.

(Means for Solving the Problems) Therefore, an object of the present invention is to automatically prevent the driver or the tour conductor from leaving the vehicle while the pantograph is attached to the contact wire without providing a grounding shoe. The vehicle's current is collected by Droriasis 1, which has a simple configuration that reduces the current collection current and immediately lowers the pantograph to prevent accidents caused by electric shock or electric shock, and prevents abnormalities in the current collection device due to sudden disconnection. You are on your way to getting the equipment.

In order to achieve this object, the present invention provides a mode changeover switch for switching between trolley mode and non-trolley mode;
The pantograph operation circuit includes a pantograph operation solenoid valve that is energized when the mode changeover switch is in the trolley mode and deactivated when it is in the non-trolley mode, and a battery that energizes the pantograph operation solenoid valve. When the pantograph is connected, the pantograph is connected to the contact wire via the current collecting rectifier circuit through the pantograph raising VF mechanism which raises the pantograph by energizing the operating solenoid valve and attaches it to the contact wire, and lowers the pantograph to disconnect from the contact wire by deenergizing the control solenoid valve. In the current collector of a trolley-assisted vehicle that runs in trolley mode using electric power from a first switching circuit section that is reset when the switch is in the trolley mode and the door switch is in the open state; and a first switching circuit section that is reset when the switch is in the trolley mode and the door switch is in the open state; When the first switching circuit section switches from the set state to the reset state by energizing the pantograph operation solenoid valve, or when the mode changeover switch switches from the trolley mode to the non-trolley mode, the pantograph operation solenoid valve is deenergized after a delay time. A second switching circuit section is provided in the pantograph operation circuit, and further, the first switching circuit section acts on a rectification control circuit of the current collecting rectification circuit when switching from the state 1 to the ceramic state. According to this configuration of the present invention, the pantograph is raised by energizing the pantograph operating solenoid valve. In order to do this, first, close the driver's cab door and put the mode selector switch in the non-trolling state to put the first switching circuit section in the set state.

Next, when the mode selector switch is switched to the trolley mode, the pantograph operation solenoid valve is energized by the second switching circuit section, whereby the pantograph is raised via the pantograph lifting mechanism and connected to the four-wire contact wire.

When the mode selector switch is in trolley mode and the pantograph is connected to the four contact wires, if the driver or tour conductor forgets to set the mode selector switch to non-trolley mode and attempts to exit the vehicle by opening the door, The first switching circuit section is reset and therefore the second switching circuit section is reset after a delay time.
The pantograph operating solenoid valve is deenergized by the switching circuit, and the pantograph automatically descends and leaves the track. Within this delay time, the third switching circuit section acts on the rectification control circuit of the current collector rectifier circuit, and the result is 1! Since the current is restricted, the pantograph can be separated from the wire after a slight delay time without causing any abnormality to the current collector. Even if the door is closed after this, the mode selector switch must be set to the non-trolley mode as described above in order to set the first switching circuit section again.

The invention will now be described in detail with reference to the drawings.

(First Embodiment) FIG. 1a shows a first embodiment of a pantograph operation circuit for a current collector according to the present invention. In this embodiment, in the conventional circuit shown in FIG. 1, a pantograph control m (P
C) The difference is that a relay system is added. This pantograph control relay system has a door contact 12 for the door switch (DS).
．． 13, a normally closed contact 14 which opens when the TOR relay 6 is energized in the trolley mode and closes when the TOR relay 6 is de-energized in the non-trolley mode, and a pantograph control (PC) relay 15 are successively connected in series. A second circuit section formed by connecting a self-holding contact 16 that is operated in parallel to the normally closed contact 14 (this second circuit section and a first circuit section that includes the mode changeover switch 5 and the TOR relay 6 are connected to each other in parallel with the normally closed contact 14) ) that constitutes the circuit section. This second circuit part is connected to a relay contact 7 which is operated by a TOR relay 6;
It is connected in parallel to a third circuit portion consisting of a relay contact 17 and an off-delay relay (TD) 30 that are acted on by the PC relay 15, and further from a relay contact 31 that is actuated by an off-delay relay 30 and a pantograph operation solenoid valve 8. A fourth circuit section is connected in parallel to the third circuit section. The third circuit section and the fourth circuit section constitute a second switching circuit section.

According to this configuration, when the driver's cab door is closed and the mode selector switch 5 is turned to the non-trolley mode (E) side, the door contact 12 of the door switch (DS).
13, energize the PC relay 15 via the normally closed contact 14,
This closes the self-holding contact 16. That is, the first switching circuit section is set. At the same time, the relay contact 17 of the second switching circuit section is also closed. In this state, move the mode selector switch 5 to the trolley mode side, that is, to T.
When the normally closed contact 14 is closed, the self-holding contact 16 is closed, so the PC relay 15 is maintained in the energized state, and the first switching circuit remains set and the second switching circuit is turned on. By closing the relay contact 7 of
PV2) is energized. As a result, the pantograph rises and connects to the contact wire as described above.

Due to the driver's carelessness, he forgot to turn the mode selector switch to the non-trolley mode side, and opened the door with the mode selector switch in the trolley mode (T side) and the pantograph still connected to the four contact wires. When the operator attempts to leave the driver's cabin, either of the door contacts 12 and 13 opens, cutting off the power to the PC relay 15. The self-holding contact 16 is therefore opened and the first switching circuit section is therefore reset. As a result, the relay contact 17 of the second switching circuit section opens, and the off delay relay 30 opens the relay contact 31 after a minute delay time, and the pantograph operation solenoid valve 8 (PV
l, PV2) are deenergized and the pantograph automatically descends and leaves the track. Even if the door is closed after this, as long as the mode selector switch 5 is on the T side, the normally closed contact 14 and the self-holding contact 16 remain open, so the current to the PC relay is cut off, that is, the first switching circuit section is maintained in a reset state.

In order to return the first switching circuit to the set state, it is necessary to switch the mode selector switch 5 to the non-trolley mode (E) side and close the normally closed contact 14 again.

In this way, electric shock or electrocution accidents due to operation errors by the driver can be reliably prevented.

On the other hand, when the first switching circuit section is reset, the third switching circuit section acts on the rectification control circuit of the current collecting rectifier circuit to throttle the current collecting current within the delay time. If the current to be collected is not restricted in this way, problems may occur such as the pantograph being damaged due to interruption of the current by the sudden drop of the pantograph, or abnormal sparks occurring in the rectifier circuit due to sudden changes in the motor current. . An embodiment of this rectification control circuit is shown in FIG.

In the embodiment shown in FIG. 2, I! Mixed bridge rectifiers CRF1 to CRF4 are used as electric rectifier circuits.

In the current collection control circuit 40 shown in FIG. 2, 60 is a transducer that generates an electric signal proportional to the depression angle of the accelerator pedal, 64 is a current detector, and thyristors CRFI, CR
A DC current Io adjusted by the firing angle of F2 is detected. The calculation point 62 receives the accelerator pedal signal 61 and the current detector signal 63 and outputs a deviation signal 65 thereof. An amplifier 66 amplifies the deviation signal 65, and its output 67 becomes one input of the calculation point 74 as a phase command. Reference numeral 10 denotes a zero detection circuit for AC voltage, which outputs a pulse signal 11 of a double frequency synchronized with the zero point of the AC voltage stepped down by the transformer 68.

Reference numeral 12 denotes a sawtooth wave generation circuit which outputs a sawtooth wave signal 73 synchronized with the pulse signal 71 and serves as the other input of the calculation point 14. 76 is a discrimination circuit that outputs "0" depending on whether the calculation point 74 is positive or negative.
” or “1” pulse signal 11 is output.

This pulse signal 77 is proportional to the AC input frequency and is
The pulse width is the accelerator command signal 61 and the actual circuit current signal 6.
It is proportional to the deviation of thyristors CRF1 and CRF2.
becomes. This rectification control circuit 40 is provided with a third switching circuit 50. The third switching circuit section 50 is constituted by an OR circuit 82 that receives an input from a NOT circuit 80 connected to the transducer 60 and an input connected to the relay contact 32 which is acted on by the PC relay 15. The output signal 83 of the OR circuit 82 prevents the firing signal 79.81 from being generated unless the accelerator is off and/or the PC relay 15 is set. Since the rectifier control circuit configured in this way forms a closed circuit, a driving force proportional to the accelerator depression angle is automatically obtained, and when the first switching circuit section is reset, Even when the accelerator pedal is depressed, the collected T1 current becomes zero.

(Second Embodiment) Next, a second preferred embodiment of the pantograph operation circuit of the current collector according to the present invention is shown in FIG. This embodiment uses non-contact elements instead of relay contacts as in the first embodiment.

In this embodiment, a first flip-flop 18 is connected to the battery 4 and has a set power S connected to the non-trolley mode contact E of the mode changeover switch 5 and a reset power R connected to the trolley mode contact T of the mode changeover switch 5. door switch DS and first flip-flop 18
A first AND circuit 19 that inputs both Q outputs of , and a person connected in parallel to this first AND circuit 19 to a door switch DS.

a second flip-flop 2 having a set power S connected to the output of the first AND circuit 19 and a reset power R connected to the output of the NOT circuit 20;
1 constitutes a first switching circuit section.

The second switching circuit section includes a second flip-flop 21
and the first flip-flop 1 connected to the Q output of
a second AND circuit 22 having an input connected to the Q output of 8;
, an off delay circuit (TD) 30a having an input connected to the output of this second AND circuit, and this off delay circuit 30
The switching element 23 has an input connected to the output of the switch a and turns on/off the power supply path from the battery 4 to the pantograph operation solenoid valve 8 (PVl, PV2). Also the second
The output of AND circuit 22 is connected to the input of OR circuit 82 shown in FIG.

The characteristics of the flip-flop 18.20 are shown in the following table.

Table 1. Characteristic table According to the configuration described above, when the mode selector switch 5 is on the non-trolley mode side (E) and the door is closed, the Q output of the first flip-flop 18 is sent to the first AND circuit 19.
1" is output. At this time, the set human power S of the 27th lip-flop is "1", the reset human power R is "0" via the negative circuit 20, and the Q output outputs "1" from the characteristic table. That is, the first switching circuit section is in the let state.

Next, when the mode selector switch 5 is set to the trolley mode side (T), the first flip-flop 18 is reset because the input is input to the reset human power R, and outputs rOJ to the Q output and "1" to the Q output. At this time, the second flip 70 knob 2
1's set human power S becomes "0", but the reset human power R does not change, that is, remains "O", so the previous Q
The state of the output remains set to "1". On the other hand, the Q output of the 17th lip-flop 18 is "1" as described above.
In order to output "1", each of the two inputs of the second AND circuit 22 of the second switching circuit section is supplied with "1". Therefore, the output of the second AND circuit 22 also becomes "1", and the switching element 23 is thereby turned on.
The pantograph operation [41 valve 8 (PVl, PV2) is energized, and the pantograph lands in the upward direction as described above.

Due to the driver's carelessness, he forgot to turn the mode selector switch to the non-trolley mode (E) side, and opened the door with the mode selector switch in the trolley mode (T) side and the pantograph still attached to the contact wire. When the driver attempts to leave the driver's cabin by opening the door and either of the door contacts 12 or 13 opens, "1" is input to the reset human power R via the negative circuit 20, so the second flip-flop 21 is reset. At this time, the Q output of the second flip-flop 21 is "0".
). That is, the first switching circuit section is in a reset state. Therefore, the output of the second AND circuit section of the second switching circuit section becomes "0", and after a slight delay time, the pantograph operation solenoid valves 8 (PVl, PV2) are deenergized, and the pantograph is automatically lowered as described above. Leave the track. During the delay time, the third switching circuit 50 (see FIG. 2) restricts the current collection. Even if the door is closed after this, as long as the mode selector switch 5 is on the T side, the second flip-flop 21 of the first switching circuit remains reset, so the pantograph operating solenoid valve 8 is never energized. To return the first switching circuit to the set state, turn the mode selector switch 5 to the non-trolley position (E).
It is necessary to switch the second flip-flop to the set state by inputting "1" to the set human power S of the second flip-flop.

In this way, electric shock or electric shock accidents due to driver's operational errors are reliably prevented, and even if the pantograph is suddenly disconnected from the pantograph, no malfunction will occur in the current collector.

(Effects of the Invention) As explained above, according to the present invention, the driver's operation can be easily achieved by using only a simple circuit configuration without providing a grounding shoe, which is seen in conventional transportation systems that always run in trolley mode. Even if there is a mistake, electric shock or electric shock accidents can be reliably prevented, and no abnormality will occur in the current collector. Furthermore, since the second embodiment is a non-contact switching circuit, it is maintenance-free and has the advantage of having a long service life.

[Brief explanation of drawings]

FIG. 1a is a circuit diagram showing the main parts of a first embodiment of the current collector for a trolley-assisted vehicle according to the present invention, and FIG. An explanatory diagram showing the mechanism; FIG. 2 is a circuit diagram showing an example of a current collection rectification circuit and a rectification control circuit of the trolley-assisted vehicle according to the present invention; FIG. 3 is a second embodiment of the trolley-assisted vehicle according to the present invention. FIG. 1... Pantograph operation circuit 2... Pantograph lifting mechanism 3.
...Pantograph 4...Battery 5...Mode changeover switch 6...Trolley mode (TOR) relay (control relay)
7, 17.32...Relay contact 8...Panther operation solenoid valve (PVl, PV2) 8a...
Pantograph operation solenoid 8 b...Vanta operation valve 9...Working fluid source 10...
・Cylinder 11...Engine mode (ENG) relay 12, 13
... Door contact 14 ... Normally closed contact 15 ... Pantograph control (PC) relay 16 ... Self-holding contact 18 ... First flip-flop 19 ... First AND circuit 20 ... NOT circuit 21...second flip-flop 22, 82...second AND circuit 23...switching element 30...off delay relay 30a...off delay circuit 40...rectification control circuit

Claims (1)

[Claims] 1. A mode changeover switch for switching between trolley mode and non-trolley mode, and a pantograph operation electromagnetic device that is energized when the mode changeover switch is in trolley mode and deactivated when it is in non-trolley mode. The pantograph operation circuit includes a valve and a battery that energizes the pantograph operation solenoid valve, and when the pantograph operation solenoid valve is energized, the pantograph is raised to connect to the contact wire, and when deenergized, the pantograph is lowered and removed from the line. In the current collector of a trolley-assisted vehicle that runs in trolley mode using electric power from a contact wire via a current collector rectifier circuit when a pantograph is connected to a pantograph via a pantograph lifting mechanism, a door switch associated with the driver's cab door is installed. a first switching circuit section that is set when the door switch is in the closed state and the mode selector switch is in the non-trolley mode, and is reset when the mode selector switch is in the trolley mode and the door switch is in the open state; When the first switching circuit section is in the set state and the mode changeover switch is in the trolley mode, the pantograph operation solenoid valve is energized, and the first switching circuit section is switched from the set state to the reset state or when the mode is switched. The pantograph operating circuit is provided with a second switching circuit section that deenergizes the pantograph operating solenoid valve after a delay time when the switch switches from the trolley mode to the non-trolley mode, and further, the first switching circuit section resets the pantograph operating solenoid valve from the set state. A current collector for a trolley-assisted vehicle, characterized in that the current collecting rectifier circuit is provided with a third switching circuit unit that acts on a rectifying control circuit of the current collecting rectifier circuit to throttle the current collecting current when the current collecting rectifying circuit switches to the current collecting state. 2. The first switching circuit section includes a first circuit section in which a mode changeover switch and a first control relay are connected in series, and the door switch and the mode changeover switch open when they are in a trolley state and closed when they are not in a trolley state. a normally closed contact that is operated by the first control relay, and a second circuit portion in which a second control relay is connected in series, and a self-holding contact that is operated by the second control relay, The second switching circuit section includes: a relay contact operated by the first control relay; a relay contact operated by the second control relay;
It shall consist of a third circuit section in which off-delay relays are connected in series, and a fourth circuit section connected in parallel to this third circuit section, and this fourth circuit section includes a relay contact that is operated by the off-delay relay, Claim 1, characterized in that the pantograph operating solenoid valves are connected in series, and the first circuit section, second circuit section, and third circuit section are connected in parallel to the battery. Trolley-assisted vehicle current collector. 3. The first switching circuit section includes a first flip-flop having a set input connected to a non-trolley mode contact of the mode changeover switch and a reset input connected to a trolley mode contact of the mode changeover switch, and a first flip-flop connected to the battery. a first AND circuit having an input connected to the door switch and an input connected to the Q output of the first flip-flop;
The second flip-flop includes a NOT circuit whose input is connected to the door switch, and a second flip-flop having a set input connected to the output of the first AND circuit and a reset input connected to the output of the NOT circuit. The switching circuit section includes a second AND circuit having an input connected to the Q output of the second flip-flop and an input connected to the @Q@ output of the first flip-flop, and an output of the second AND circuit. The invention is characterized in that it is comprised of an off-delay circuit having a connected input, and a switching element having an input connected to the output of the off-delay circuit to turn on and off a power supply path from the battery to the pantograph operation solenoid valve. A current collector for a trolley-assisted vehicle according to claim 1.