JPS6223301A - 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 change over switch 5 is shifted to a nontrolley mode side, a pantograph control (PC) relay 15 is energized to close a contact 17. 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 and the driver intends to separate in the state that the switch 5 is shifted to the trolley mode, any of door contacts 12, 13 is opened to deenergize the relay 15 to deenergize the valve 8, thereby automatically falling the pantograph.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to dump trucks used for transporting ore in large-scale mines. In order to reduce costs, and to reduce exhaust gas emissions in mines where exhaust gas contamination inside mining bits by dump trucks is a problem, we have changed the loading course from the bottom of the bit, which consumes the most fuel, to the outside of the bit. This article relates to a current collector for a trolley-assisted dump truck that runs on inexpensive external power collected from overhead wires (trolley wires) and runs on its own engine on the reverse course.

(Prior Art) A conventional current collector of this type of trolley-assisted vehicle is equipped with a pantograph operation circuit 1 as shown in FIG. When the vehicle ascends and connects to the contact wire, a current collector drive circuit (not shown) causes the vehicle to run in a trailing manner.

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

This battery 4 is also used to control a control circuit for electric drive of a trolley assist vehicle (not shown), to control an alternator driven by a diesel engine in the engine mode, or to supply low voltage power to various electrical equipment. used.

This pantograph operation circuit 1 is operated by a control relay, that is, when the mode selector switch 5 provided on the shoe board of the driver's cab is manually switched to the T side of the trolley mode.
OR) When relay 6 is energized, relay contact 7 closes and energizes pantograph operation solenoid valve 8 (PVl, PV2).
That is, the pantograph operation solenoid 8a is energized, and the pantograph operation valve 8b is actuated. This allows the working fluid (e.g. air)
Pressurized fluid is introduced into the cylinder 10 from the source 9, and the link mechanism causes the pantograph 3 to rise and connect 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 mode changeover 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, the pantograph operation solenoid valve 8 (solenoid 8a and operation valve 8b) is deenergized, and the pressure inside the cylinder is The pressure fluid is drained and the pantograph is lowered and separated from the contact wire. At the same time, in the example shown in Figure 1, the engine mode (ENG) is set.
An engine mode command is generated by the relay 11, and preparations for self-propulsion in the engine mode can be made using the on-vehicle diesel engine via a control circuit (not shown).

However, in the circuit shown in Figure 1, the driver or the tour operator forgets to turn the mode selector switch to the E side (non-trolley mode) and leaves it in the lower side (trolley mode), that is, the pantograph is turned off. If you try to get off the vehicle with the contact wire attached, 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 tires of the dump truck, will be maintained at ground potential. There is a risk.

In general third-rail new transportation systems or trolleybuses that run in trolley mode all the time, when stopping at a station platform for the safety of passengers, the following regulations are required: A grounding shoe is used to ground the vehicle body.

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

Therefore, an object of the present invention is to prevent electric shock or the like even when the driver or tour conductor tries to get off the vehicle with the pantograph attached to the contact wire without providing a grounding shoe. To obtain a current collector for a trolley-assisted vehicle with a simple configuration capable of preventing accidents caused by electric shock.

To achieve this objective, 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 attached to the wire, the pantograph is moved up and down to attach to the contact wire by energizing the operating solenoid valve, and the pantograph is lowered and separated from the contact wire by deenergization. In the current collector of a trolley-assisted vehicle running in mode, when the door switch related to the driver's cab door is in the closed state and the mode changeover switch is in the non-trolley mode, the mode changeover switch is set to mode and is reset when the door switch is in the open state; and when the first switching circuit is in the set state and the mode changeover switch is in the trolley mode, the pantograph operating electromagnetic The pantograph operation circuit is provided with a second switching circuit section that energizes the valve and deenergizes the pantograph operation solenoid valve when the first switching circuit section is in a reset state or when the mode changeover switch is in a non-trolley mode. This is considered a special offense.

(Function) According to this configuration of the present invention, in order to energize the pantograph operation solenoid valve to raise the pantograph, first close the driver's cab door and set the mode changeover switch to the non-trolling state. 1. Set the switching circuit section.

Next, when the mode changeover switch is switched to the trolley mode, the pantograph operation solenoid valve is energized by the second switching circuit section, and thereby the pantograph moves up and down.
Climb up through the trolley line and reach the company line.

When the mode selector switch is in the 7-way position and the pantograph is connected to the trolley wire, the driver or a passenger forgets to set the mode selector switch to non-trolley mode and opens the door, causing the vehicle to die. When an attempt is made to operate the pantograph, the first switching circuit section is reset, and the second switching circuit section then operates the pantograph. [Valve a is deenergized and the pantograph automatically descends and leaves the track.] 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 turn on 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 addition to the trolley mode control (TOR) relay system, a pantograph control fil (
PC) The difference is that a relay system has been added. This pantograph control relay system has door contact 1 for the door switch (DS).
2.13, the 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 the pantograph control ll (PC) relay 15 are connected in series, and A circuit section (first switching circuit section) is provided in which a self-holding contact 16 that is operated by a PC relay 15 is connected in parallel to a normally closed contact 14,
This circuit section is constructed by connecting in parallel to a circuit section consisting of a relay contact 7 and a pantograph operation solenoid valve 8 which are operated by a TOR relay 60. Furthermore, a second switching circuit section is constructed by connecting a relay contact 17, which receives the action of a PC relay 15, in series with the relay contact 7.

According to this configuration, when the door of the driver's cab is closed and the mode changeover switch 5 is set 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 open, the self-holding contact 16 is closed, so the PC relay 15 is maintained in the energized state, and the first switching circuit section is closed while the second switching circuit section is closed. By closing the relay contact 7, the pantograph operation solenoid valve 8 (PVI) is activated.

PV2) is energized. As a result, the pantograph rises and connects the four contact wires 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 11 of the second switching circuit opens, and the pantograph operation solenoid valve 8 (PVI, PV2
) is deenergized and the pantograph automatically descends and leaves the track.

Even if this entry door is closed, the mode selector switch 5 is set to T.
As long as the PC relay is on the side, the normally closed contact 14 and the self-holding contact 16 remain open, so that the state in which the power supply to the PC relay is cut off, that is, the first switching circuit section is maintained in the 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.

(Second Embodiment; A) 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 70 knob 18
a first AND circuit 19 inputting both of the Q outputs of the first AND circuit 19; a NOT circuit 20 having an input parallel to the first AND circuit 19 and connected to the door switch DS;
A first switching circuit section is constituted by a second flip-flop 21 having a set input power S connected to the output of the negative circuit 9 and a reset input power R connected to the output of the negative circuit 20.

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;
and has an input connected to the output of this second AND circuit, and connects the pantograph operation solenoid valve 8 (PVl, PV2) from the battery 4.
> is configured by a switching element 23 that turns on and off the power supply path.

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

Table 1. According to the configuration described in the characteristic table, if the mode selector switch 5 is on the non-trolley mode side (E) and the door is closed, the 17th
The Q output of the lip flop 18 is sent to the first AND circuit 19.
1" is output. At this time, the setting power S of the second flip-flop is "1", the reset input R is "0" via the NOT circuit 20, and the Q output is "1" from the characteristic table. That is, the first switching circuit section is in the set state.

Next, when the mode selector switch 5 is set to the trolley mode side (T), the 17th lip-flop 18 is reset because input is input to the reset human power R, and outputs ro''' to the Q output and ``1'' to the a output. At this time, the second flip-flop 2
The set human power S of 1 becomes rOJ, but the reset human power R does not change, that is, remains "0", so the previous Q
The output state remains set to 1. on the other hand,
The σ output of the first flip-flop 18 is “
In order to output "1", "1" is supplied to the two inputs of the second AND circuit 22 of the second switching circuit section, respectively. Therefore, the output of this second AND circuit 22 also becomes "1", thereby turning on the switching element 23, energizing the pantograph operation solenoid valves 8 (PVl, PV2), and as described above, the pantograph rises 4. Line.

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 vehicle 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"
Output>. That is, the first switching circuit section is in a reset state. Therefore, the output of the second logic circuit section of the second switching circuit section becomes "0", and the pantograph operation solenoid valve 8 (
PVl, PV2> are deenergized, and the pantograph automatically descends and leaves the track as described above.

Even if the door is closed after this, the mode selector switch 5 will be set to T.
As long as the second flip-flop 21 of the first switching circuit section remains reset, the pantograph operating solenoid valve 8 will never be energized. To return the first switching circuit to the set state, use the mode selector switch 5.
It is necessary to switch to the non-trolley mode ([) side and input "1" to the set input S of the second flip-flop to bring it into the set state. In this way, electric shock or electric shock accidents due to driver's operational errors are reliably prevented.

(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.

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 the drawing]

FIG. 1a is a circuit diagram showing a main part of a first embodiment of a current collector for a trolley-assisted vehicle according to the present invention, and FIG. FIG. 2 is an explanatory diagram showing the lifting mechanism. FIG. 2 is an operation circuit diagram of a second embodiment of the trolley-assisted vehicle according to the present invention. 1... Pantograph operation circuit 2... Pantograph lowering mechanism 3.
...Pantograph 4...Battery 5...Mode changeover switch 6...Trolley mode (TOR) relay (control relay)
7.17...Relay contact 8...Panther operation solenoid valve (PVl, PV2>8a...
・Pantograph operation solenoid 8b...Pantograph 9...Working fluid source 10・
··Cylinder

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 the contact wire when the pantograph is connected to the pantograph via the pantograph lifting mechanism, the door switch related to the driver's cab door is in the closed state and the mode is a first switching circuit section that is set when the changeover switch is in the non-trolley mode and reset when the mode changeover switch is in the trolley mode and the door switch is in the open state; and the first switching circuit section is hit. state and the mode changeover switch is in the trolley mode, the pantograph operation solenoid valve is energized, and when the first switching circuit section is in the reset state or the mode changeover switch is in the non-trolley mode, the pantograph operation solenoid valve is energized. A current collector for a trolley-assisted vehicle, characterized in that the pantograph operation circuit is provided with a second switching circuit section that deenergizes the valve. 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 opens when the door switch and mode changeover switch are in a trolley state, and closed in a non-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;
The pantograph operating solenoid valve is constituted by a third circuit section connected in series, and the first circuit section, second circuit section and third circuit section are connected in parallel to the battery. A current collector for a trolley-assisted vehicle according to scope 1. 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 Q output of the first flip-flop 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. 2. The current collector for a trolley-assisted vehicle according to claim 1, further comprising a switching element having a connecting input to turn on and off a power supply path from the battery to the pantograph operation solenoid valve.