JPH0329930Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to an air-lift pantograph for use in trackless electric vehicles. In particular, the vehicle usually runs on its own by driving an electric motor using electric power from the engine generator installed in the vehicle, and in some sections such as uphill roads,
This invention relates to a so-called trolley-assist type air-lifting pantograph for rubber-tired transport vehicles, which collects current from a trolley wire installed above the ground using a pantograph mounted on the vehicle to drive an electric motor in place of the engine-generator power source.

[Prior Art] As shown in FIGS. 3 and 4, a conventional trolley assist vehicle is provided with a pair of left and right pantographs 2 at the top of a vehicle 1, and a current collector boat 4 is attached to the upper ends of these pantographs. When traveling by collecting current from a trolley wire, the pantograph 2 is raised to bring the collector boat 4 into contact with two trolley wires 3 and 3' constructed above the ground. One of these trolley wires 3, 3' has a positive polarity and the other has a negative polarity.

As shown in FIG. 5, the pantograph 2 is connected to the vehicle 1.
The current collector boat 4 is attached to the free end via the insulator 14.
The lower frame 7 is attached to a main shaft 6 supported by a bearing fixed to the vehicle. Working arms 8 and 9 are further attached to this main shaft 6. One end of the tension spring 10 is attached to the working arm 8, and the other end of this tension spring is attached to the vehicle, so that the lower frame 7 rotates clockwise in the drawings around the main shaft 6 via the working arm 8. Make it. A pneumatic actuator is configured to act on the working arm 9. This actuator is composed of a cylinder 11 that receives air pressure from an air source, a piston rod 12 disposed within the cylinder 11, and a pressure spring 13 that normally presses the piston rod outward. The outer end of the pantograph presses the action arm 9 to rotate the lower frame 7 counterclockwise against the force of the tension spring 10, causing the pantograph to descend rapidly.

However, by energizing the solenoid valve 15 to the state shown in FIG.
7. When the piston rod 12 is drawn into the cylinder against the force of the pressure spring 13 by introducing it into the cylinder 11 through the orifice 18 and the check valve 19, the lower frame 7 is moved by the tensile force of the tension spring 10. Rotating clockwise around the main shaft 6, the pantograph is raised and the collector boat 4 provided at the free end of the link member engages with the trolley wire 3 or 3'. Conversely, when the solenoid valve 15 is deenergized, the state changes to the state opposite to that shown in the figure, and the air in the cylinder 11 flows through the orifice 2.
0,18 and via conduit 17 to solenoid valve 15
is exhausted from the exhaust port. Accordingly, the piston rod 12 is pushed outward by the pressing spring 13 and engages the operating arm 9 to rotate the lower frame 7 counterclockwise and lower the pantograph.

[The problem that the idea attempts to solve]

Trolley-assist vehicles with such pantographs are mainly used in mines, etc., and do not have dedicated tracks and require the driver to visually follow the trolley line. If the pantograph deviates from the width of the running path, the collector boat of the pantograph will come off the contact wire, and the pushing force of the pantograph will cause the collector boat to protrude above the trolley wire, causing the pantograph to hook the overhead wire and cause the pantograph and the There is a risk of damaging the trolley wire equipment.

Therefore, the purpose of the present invention is to provide an air lift type that can detect when the pantograph is about to come off the trolley wire and quickly lower the pantograph to prevent damage to the pantograph and the trolley wire. There is to get a pantograph.

[Means to solve the problem]

To achieve this objective, the present invention is an air-lift pantograph for a trackless electric vehicle having an emergency lowering device, wherein the emergency lowering device has a limit valve and a rapid exhaust valve, the limit valve is a current collector. The rapid exhaust valve is installed near both ends of the boat to detect the limit movement of the collector boat and generate an output, and the quick exhaust valve is connected to the air circuit of the cylinder as a pantograph actuator and is operated by the output of the limit valve. The feature is that the pantograph can be lowered in an emergency.

[Effect]

According to the air-lifting pantograph of the present invention, when the vehicle moves significantly left and right during trolley-assisted running of the vehicle and the collector boat attempts to come off the trolley wire, the limit valve detects the limit movement of the collector boat. For example, a trolley wire acts on the operating member of the limit valve to switch the limit valve to the atmosphere communication side. In response to the pressure reduction caused by the limit valve communicating with the atmosphere, the rapid exhaust valve operates, rapidly exhausting the pressurized air flowing into the cylinder, and causing the pantograph to descend urgently.

〔Example〕

Next, preferred embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows a pneumatic circuit for a cylinder 11 of an air-lift pantograph actuator with an emergency lowering device A according to the invention.

This emergency descent device A has a limit valve 21 attached near both ends of the collector boat 4, and a quick exhaust valve 27 connected between the limit valve 21 and the sill 11. This limit valve 21
Air is supplied to the orifice 2 through the supply conduit 22.
3. By connecting to the supply conduit 17 from the solenoid valve 15 via the check valve 24. As shown by the dotted line in FIG. 2, when the operating member 25 of the limit valve is pushed outward by the trolley wire 3 or 3', the limit valve 21 switches to the atmosphere communication side and connects the supply conduit 2.
The air from 2 is connected to the exhaust port 26 of this limit valve.
A mechanical switching valve that exhausts air from the In order to apply the air pressure of the limit valve 21 to the quick exhaust valve, a conduit 28 branching from the supply conduit 22 to the limit valve 21 is connected to the pilot port 29 of the quick exhaust valve 27, and the quick exhaust valve 27 is connected to the connecting conduit 3.
0 connects to cylinder 11.

Furthermore, in the illustrated embodiment, limit valve 21 is connected to pressure switch 31. That is, the pressure switch 31 is connected by a conduit 32 to the supply conduit 22 to the limit valve. This pressure switch 3
1 shall close at a certain pressure or higher, and is connected in series to a switch for operating a solenoid valve 15, although not shown. According to the present invention, the conduits 22, 28, 32 in this air circuit can be considered as a pressure sensing circuit, and are shown in dotted lines in FIG. 1 to help distinguish them from other parts. Furthermore, when the pantograph is raised, the solenoid valve 15 closes even if the pressure switch 31 does not close for approximately 10 seconds due to the timer.
An electrical circuit is provided to energize the

Next, the operation of the embodiment of the present invention shown in FIGS. 1 and 2 will be explained. When raising the pantograph, turn on the operating switch (not shown) for the solenoid valve 15, the solenoid valve 15 is energized and switched to the state shown, and air pressure is supplied to the cylinder 11 and the limit valve 21. , the pantograph 2 (see Figures 3, 4 and 5) is raised and the pressure switch 31 is closed.

When the pantograph is normally lowered, when the solenoid valve 15 is deenergized, this solenoid valve 15
is switched to a state opposite to that shown, the air in the cylinder 11 is exhausted from the exhaust port of the solenoid valve 15 via the orifices 20 and 18, and the pantograph slowly descends. At this time, the pressure in the pressure detection circuit (the part indicated by the dotted line in FIG. 1) does not decrease due to the action of the check valve 24, and the rapid exhaust valve 27 does not operate. As the pressure in the cylinder 11 decreases, the pressure in the pressure sensing circuit flows into the cylinder 11 through the conduit 28, the quick exhaust valve 27, and the connecting conduit 30, and then is exhausted from the exhaust port of the solenoid valve 15. The pressure in the pressure sensing circuit will never be lower than the pressure in the cylinder 11, so the quick exhaust valve 27 will not operate.

Next, the case of emergency descent will be explained. Vehicle 1 (3rd
and 4) deviate from the specified running width, the trolley wire 3 or 3' will close the limit valve 2.
2, the limit valve 21 switches from the state shown in FIG. 1 to the state in which the supply conduit 22 communicates with the atmosphere. As a result, the air in the pressure detection circuit is exhausted to the atmosphere from the exhaust port 26 of the limit valve, and the pressure is reduced. (However, from the air source to the check valve 2
4 into the pressure detection circuit is throttled by the orifice 23 to be smaller than the amount exhausted from the exhaust port 26). This pressure drop in the pressure sensing circuit activates the quick exhaust valve 27, the air in the cylinder 11 is exhausted from the exhaust port 33 of the quick exhaust valve 27, and the pantograph rapidly descends. At the same time, the pressure switch 31 opens and the solenoid valve 15 is deenergized, switching to the state opposite to that shown in FIG. Therefore, the air in the cylinder 11 is also exhausted from the exhaust port of the solenoid valve 15 via the orifices 20 and 18, allowing the pantograph to descend even more rapidly.

[Effect of idea]

As described above, according to the present invention, even if the vehicle deviates from the designated route, the pantograph will rapidly descend, and accidents caused by the pantograph getting caught on overhead wires can be prevented.

[Brief explanation of drawings]

Fig. 1 is a pneumatic circuit diagram of a pantograph with an emergency lowering device according to the present invention, Fig. 2 is a diagrammatic illustration of the operating state of the operating member of a limit valve of a pantograph according to the present invention, and Figs. 3 and 4 are respectively A side view and a rear view showing a state in which a pantograph of a vehicle is engaged with a trolley wire, and FIG. 5 are diagrammatic explanatory diagrams showing a mechanical configuration and an air circuit of a conventional pantograph. 1...Vehicle, 2...Pantograph, 3,3'...
... Trolley wire, 4 ... Current collector boat, 5 ... Link member, 6 ... Main shaft, 7 ... Lower frame, 8, 9 ... Working arm, 11 ... Cylinder, 12 ... Piston rod, 13 ... Pressure Spring, 14...Insulator, 15
... Solenoid valve, 16 ... Air source, 17,2
8, 32... Conduit, 18, 20, 23... Orifice, 19, 24... Check valve, 21... Limit valve, 22... Supply conduit, 25... Working member,
26...Exhaust port, 27...Rapid exhaust valve, 29...
Pilot port, 30... Connection conduit, 31...
Pressure switch, A...Emergency lowering device.

Claims (1)

[Scope of Claim for Utility Model Registration] An air-lift pantograph for a trackless electric vehicle having an emergency descent device A, wherein the emergency descent device A has a limit valve 21 and a rapid exhaust valve 27, and the limit valve 21 has a The rapid exhaust valve 27 is installed near both ends of the collector boat 4 to detect the limit movement of the collector boat 4 and generate an output. An air-lifting pantograph for trackless electric vehicles that operates with the output of a limit valve and lowers the pantograph 2 in an emergency.