JPH09247803A - Lifting and lowering device for pantograph - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a collector head from being brought into contact with a cable line with a shock when it is lifted in a spring-lifted type pantograph. SOLUTION: In a spring-lifted type pantograph, a pressure reducing valve 15 and a check valve 16, which supply compressed air of a smaller pressure than the minimum folding air pressure to cylinder 6 for lowering when a switch for lifting is turned on, constitute an air duct. With this structure, the pantograph is lifted smoothly even if the switch for lifting is kept pressed, and then the lifting speed is slowed down by a resistance in discharging air out of the cylinder 6 for lowering and thereby a collector head 1a gently brought into contact with a cable line.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pantograph ascending / descending device for slowing the ascending speed that acts when a spring-ascending pantograph is elevated.

[0002]

2. Description of the Related Art As a method for raising a pantograph mounted on an electric vehicle, there are a spring raising type and an air raising type. In either method, a lever attached to a main shaft of a lower frame forming a pantograph main frame is used. It is pulled by the pulling force of the main spring, and the main shaft is rotated to cause the main frame to move upward.
In the spring lift type, a tension force is always applied to the main spring, and when the action of the pantograph folding and locking mechanism is released, the tension force of the main spring immediately causes the pantograph to be raised.

FIG. 2 is a mechanism diagram showing an example of a raising and lowering operation circuit of a spring-lifting pantograph which has been conventionally used. 1 is a pantograph main frame (hereinafter referred to as pantograph), 1a is a collecting boat, and 1b is Main axis of pantograph 1,
Reference numeral 1c is a main spring, 1d is a lever for lowering a pantograph fixed to a main shaft 1b, 1e is a ceiling pipe, 2 is a key for locking a pantograph fold, and 3 is a disengagement cylinder for unlocking the locking key 2. Reference numeral 3a is a return spring of the key 2, 4 is an air pipe, 5 is a solenoid valve for raising, 6 is an air cylinder for pantograph lowering, 6a is a piston, 6b is a piston rod tip, 7 is an air pipe, 8 is a lowering solenoid valve. , 8a are exhaust holes of the solenoid valve, 9
Is a compressed air source, 10 is an up switch, 11 is a down switch,
12 is a power source and 13 is an overhead wire, and FIG. 2 shows a state in which the pantograph 1 is raised and is in contact with the overhead wire 13.

In FIG. 2, when the raised pantograph 1 is lowered, when the lowering switch 11 is operated to excite the solenoid valve 8, compressed air passes from the compressed air source 9 through the solenoid valve 8 and the air pipe 7 to the air cylinder 6. The piston 6a and the piston rod tip 6b move to the left in the figure. The pantograph lowering lever 1d is pushed by the piston rod tip 6b, the main shaft 1b rotates in the direction of the arrow X, and the pantograph 1 lowers against the tensile force of the main spring 1c. At the end of the descending process of the pantograph 1, the ceiling pipe 1e is folded and locked for locking 2
, And the pantograph 1 descending operation is completed. When the operation of the lowering switch 7 is stopped, the solenoid valve 8 is also released, the compressed air in the air cylinder 4 is released into the atmosphere from the exhaust hole 8a of the solenoid valve 8, and the piston 6a in the air cylinder 6 is in a non-pressurized state. Becomes

Next, in order to raise the pantograph 1 in the folded state, when the raising switch 10 is operated to excite the solenoid valve 5, compressed air is removed from the compressed air source 9 through the solenoid valve 5 and the air pipe 4. The key 2 is opened up to the cylinder 3 and the ceiling tube 1e of the pantograph 1 is unlocked. The pantograph 1 which is unlocked in the folded state performs an ascending operation by the pulling action of the main spring 1c, and at this time, the descending lever 1
d pushes the piston rod tip 6b, the piston 6a moves in the air cylinder 6 to the right as shown in the figure, and the pantograph rises. However, the air in the air cylinder to the right of the piston 6a is at atmospheric pressure, so there is no resistance. Without it, the pantograph rises rapidly.

[0006]

As described above, in the spring rising type pantograph, when the pantograph folding locking mechanism, that is, the folding locking key is released, the pantograph is pulled by the pulling force of the main spring. Rises rapidly. Therefore, the collector boat of the pantograph crashes into the overhead line and damages the overhead line. there were.

[0007]

SUMMARY OF THE INVENTION The present invention provides an ascending / descending device which eliminates the drawbacks of the conventional pantograph, and the means thereof will be described below. In the ascending / descending device of the present invention, the air circuit for the conventional pantograph is provided with an air pipe line connecting the air pipe to the degaussing cylinder and the air pipe to the descending air cylinder. In this air line, the side of the air pipe to the de-cylinder is the high pressure side, and the side of the air pipe to the descending EU cylinder is the low pressure side. An air circuit is formed by providing a pressure reducing valve in the air conduit and a check valve in the direction of blocking the air flow in the direction from the low pressure side to the high pressure side of the pressure reducing valve on the low pressure side of the pressure reducing valve. To do.

Further, the set pressure of the pressure on the low pressure side of the pressure reducing valve is set to a predetermined air pressure which is lower than the lowest air pressure capable of reliably folding the pantograph in the raised state, that is, the lowest folding air pressure. It is something to set.

The operation of the raising / lowering device of the present invention will be described with reference to FIG. 1. When raising the pantograph, when the raising switch is pushed from the folded state of the pantograph, the raising solenoid valve is excited and the compressed air is removed. Air is supplied to the cylinder and the locking key opens. At the same time, the compressed air of a predetermined pressure reduced to a pressure smaller than the minimum folding air pressure is passed through the air pipe connecting the air pipe to the de-cylinder and the air pipe to the descending air cylinder to the descending air cylinder. Is supplied to the piston rod 6b of the descending air cylinder.
After that, a force in the direction of lowering the pantograph 1 is generated on the lowering lever 1d.

However, the force in the direction of lowering the pantograph generated at this time is a force due to the air pressure that is smaller than the minimum folding air pressure, so it is a little smaller than the force to raise the pantograph due to the tension of the main spring, and the pantograph has a difference between the two. The lower lever 1d pushes the piston rod tip 6b into the air cylinder 6 by a small ascending force, and the compressed air in the air cylinder is gradually exhausted from the exhaust hole 8a, and the pantograph slowly rises and gently contacts the overhead wire. To do.

In this case, even if the raising switch is kept pressed all the time, the raising operation is not affected at all. That is, in the ascending / descending device of the present invention, when the pantograph is ascended, the air pressure supplied to the descending air cylinder is set to be smaller than the minimum folding air pressure, so that the ascending switch operation at the time of ascending can be performed in exactly the same manner as the conventional one.

For example, the compressed air supplied to the descending air cylinder when the raising switch is operated is different from that of the present invention, and in the case of compressed air that has not been depressurized, the force for lowering the pantograph by the descending air cylinder is the main spring. Since it is larger than the ascending force due to the tension, the locking key opens and the pantograph stops rising. Therefore, in this case, (1) Install a timer and solenoid valve, and supply compressed air to the lowering cylinder for a very short time when the rising switch is turned on, then open the rising switch to stop the air supply. It is necessary to construct a different circuit, and the rising speed is buffered by the resistance when exhausting the compressed air supplied to the lowering air cylinder. (2) Alternatively, the time during which the lift switch is pressed is limited to a short time of about 1 to 2 seconds, the lift switch is released, the supply of compressed air to the descending air cylinder is cut off, and the locking key is held for a while. Must be left open.

In both the above items (1) and (2), it is necessary to leave an interval of about several minutes when pressing the up switch once and then pressing it again. Otherwise, it remains in the descending cylinder. There is pressure and it does not rise normally. As described above, when the compressed air supplied to the descending air cylinder shown in the device of the present invention is not made smaller than the minimum folding air pressure, extra equipment and parts are required, and the operation procedure becomes complicated, which is very practical. Not.

[0014]

1 is a mechanism diagram showing a raising and lowering operation circuit of a pantograph raising and lowering device according to an embodiment of the present invention. In FIG. 1, the same reference numerals as those in FIG. 2 indicate the same parts or parts having the same function, 14 is an air pipe connecting the air pipe 4 to the de-cylinder cylinder and the air pipe 7 to the descending air cylinder, and 15 is A pressure reducing valve attached to the air pipe with the side of the air pipe of the cylinder removed as the high pressure side and the side of the air pipe to the descending air cylinder as the low pressure side, and 16 is the low pressure of the pressure reducing valve 15 of the air line 14. It is a check valve attached to the side.

The operation of the device of the present invention will be described below. FIG. 1 shows a state in which the pantograph 1 is raised and is in contact with the overhead wire 13. When the lowering switch 11 is operated in this state, the solenoid valve 8 is excited and compressed air is supplied from the compressed air source 9 to the lowering air cylinder 6 via the solenoid valve 8 and the air pipe 7, as described below with reference to FIG. By the same action, the pantograph 1 is folded and the locking hook 2 locks the ceiling pipe 1e. At this time, the compressed air is cut off by the check valve 16 in the air circuit from the air pipe 7 to the descending air cylinder to the air pipe 14 branched.

Next, when the pantograph 1 in the folded state is raised, when the raising switch 10 is operated, the solenoid valve 5 is excited, and compressed air is supplied from the compressed air source 9 to the solenoid valve 5,
Air is supplied to the disengagement cylinder 3 via the air pipe 4, and the locking hook 2 is opened. At the same time, compressed air is also supplied to the air pipe 14, and the pressure reducing valve 15 provides a predetermined air pressure smaller than the minimum folding air pressure. It is decompressed to and is stopped by the descending air cylinder 6 via the air pipe 7.

The compressed air contained in the descending air cylinder 6 generates a force in the descending lever 1d via the piston 6a and the piston rod tip 6b in the direction of lowering the pantograph 1. Here, the generated force in the direction of lowering the pantograph is a force due to a predetermined air pressure that is smaller than the minimum folding air pressure, and thus is a little smaller than the force in the direction of raising the pantograph due to the tension of the main spring. Therefore, the pantograph pushes the piston rod tip 6b into the air cylinder 6 by the force of a slight difference between the force in the ascending direction and the force in the descending direction, and the compressed air in the air cylinder 6 Is gradually exhausted from the exhaust hole 8a of the solenoid valve 8, and the pantograph 1 slowly rises as it is exhausted, and is gently attached to the overhead wire.

In this case, even if the raising switch 10 is turned off immediately after the pantograph starts to rise, or is kept pressed until the pantograph's raising operation is completed, or even if the raising switch is continuously pressed again and again, the air is turned on. Since the compressed air supplied to the pipe 7 is always smaller than the minimum folding air pressure, the operation of the raising switch is easy without hindering the raising operation of the pantograph.

In this embodiment, the case of using the air cylinder for disengaging the lock is shown as the method of releasing the locking key when folding, but the electromagnetic disengaging device is used as the method of releasing the locking key. Even if it is, by supplying the compressed air of a pressure smaller than the minimum folding air pressure to the descending air cylinder in conjunction with the operation of the electromagnetic de-catch device,
You can get exactly the same effect.

[0020]

The pantograph raising / lowering device of the present invention is
When the pantograph is raised, the locking key is opened, and at the same time, compressed air with a pressure smaller than the minimum folding air pressure can be fed into the descending air cylinder. Ascending / descending device that is easy to operate and can perform effective ascending speed buffering without requiring complicated operations such as specifying the operation time of the ascending switch or prohibiting continuous pressing. Can be obtained.

[Brief description of drawings]

FIG. 1 is a mechanism diagram showing a raising and lowering operation circuit of a pantograph raising and lowering device according to an embodiment of the present invention.

FIG. 2 is a mechanism diagram of an example of a lifting and lowering operation circuit of a spring-lifting pantograph which has been conventionally used.

[Explanation of symbols]

 1 Pantograph main framework 1a Current collecting boat 1c Main spring 1d Pantograph lowering lever 1e Ceiling pipe 2 Folding locking key 3 Detaching cylinder 5 Lifting solenoid valve 6 Lowering air cylinder 8 Lowering solenoid valve 9 Compressed air source 10 Up switch 11 Down switch 15 Pressure reducing valve 16 Check valve

Claims (2)

[Claims] 1. A spring-up type pantograph which rises due to the tension of a main spring and descends due to the aerodynamic force of a descending air cylinder. In the descending air cylinder, the pantograph in the descending state is interlocked with the closing of a pantograph raising switch. An ascending / descending device for a pantograph, characterized in that compressed air having a predetermined pressure smaller than the minimum folding air pressure capable of folding is supplied to the descending air cylinder. 2. When supplying compressed air having a predetermined pressure smaller than the minimum folding air pressure to the descending air cylinder, an air pipe from the compressed air source to the key removing cylinder and a compressed air source to the pantograph descending air cylinder. An air pipe that connects the air pipe to the air pipe is connected to the air pipe, and in the middle of these two air pipes, the air pipe side to the de-cylinder cylinder is the high pressure side, and the air pipe side to the descending air cylinder is the low pressure side. A pressure reducing valve is attached, and a check valve is attached to the low pressure side of the pressure reducing valve in a direction in which the air flow in the direction from the low pressure side to the high pressure side of the pressure reducing valve is blocked. Then, the pressure on the low pressure side of the pressure reducing valve is set to a predetermined pressure lower than the minimum folding air pressure, and the cylinder and the pressure reducing valve are decoupled from the compressed air by interlocking with the rise switch of the pantograph. Attached 2. The pantograph ascending / descending device according to claim 1, wherein air is supplied to the descending air cylinder via the air duct.