JP2007236104A - Pantograph with overload detection device for railcar - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pantograph for a vehicle having an overload detection device capable of detecting an overload and automatically reducing the load. <P>SOLUTION: A bracket 6 journaling a lower edge of a balance bar 5 to a base frame 16 is rotatably journaled to the base frame 16, fixed at the base frame with an elastic force of an elastic body 7, and integrated with the base frame 16 without relative displacement when a load in a traveling direction applied to the pantograph 1 is a detected load or less. When the load exceeds the detected load, the relative displacement to the base frame 16 is generated at the bracket 6. Therefore, a piston 11 for an air valve composed of the piston 11 and the piston cylinder 6b is discharged to operate a pressure switch 14. Besides, a displacement sensor detects the displacement of the bracket instead of the air valve to operate the pressure switch. Furthermore, the pivoted position of the bracket 6 is selected so that the bracket 6 may be displaced almost by the detected load regardless of a working height of the pantograph. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a current collector for a railway vehicle, and more particularly to a current collector with an overload detection device applied to a system that detects an overload that causes damage to the current collector and automatically lowers the current collector.

If the current collecting device of the traveling vehicle is damaged due to excessive external force during traveling and continues to travel as it is, great damage such as disconnection of the overhead wire by the damaged current collecting device occurs.
In particular, as the speed of railway vehicles increases in recent years, the load received by the current collector due to collisions with flying objects increases, and even small collisions that have not been a problem so far are likely to be damaged. It is done. Further, since a long braking distance is required until the vehicle stops after the current collector is broken, it is conceivable that the overhead wire is damaged over a long section.
Therefore, a current collector with an overload detection device that detects an excessive load load in the vehicle traveling direction on the current collector boat that causes damage to the current collector and automatically lowers the current collector to protect the overhead line. There is a need for an emergency descent system with equipment. If multiple current collectors are installed in the vehicle and the current collector is damaged due to an improper overhead line, all subsequent current collectors can be lowered immediately after the leading current collector is damaged. There is also an effect of protecting the electric device.
The emergency descent system is composed of a mechanism for detecting overload provided in the current collector and releasing pressure air and a pressure switch provided on the vehicle body side. The lowering cylinder of the electric device is controlled to automatically lower the current collecting device.

As a current collector with an overload detection device, for example, a device described in Patent Document 1 has been proposed. An example of the structure of the current collector with an overload detection device according to the conventional technique is shown in FIG. 7 and 8 are cross-sectional views taken along the line BB in FIG.
In the figure, 1 is a current collector boat, 2 is an upper frame, the current collector boat 1 is attached to one end of an upper frame 2, and the lower frame is connected to the other end side of the upper frame 2 via an intermediate hinge 4. 3 is attached, and one end side of the counter bar 5 is rotatably attached.
Further, the other end side of the lower frame 3 is pivotally supported by a support member 17 attached to the base frame 16, and the other end side of the balancing rod 5 is attached to the bracket 6 attached to the base frame 16. It is pivotally supported on the attached pin 9. Reference numeral 20 denotes an overhead line.

As shown in FIG. 7, the lower end of the balancing rod 5, which is one of the components of the frame that supports the current collector boat 1, is provided with a notch groove in the bracket 6 that is fastened to the frame 16 and integrated. The pin 9 is rotatably supported by a shaft.
When an excessive load that causes damage to the current collector due to the collision of the flying object 21 with the current collector boat 1 or the like, the load of the counter rod 5 increases, and the pin 9 shears and breaks at the notch groove portion. The upper frame 2 loses its fulcrum and rotates with its own weight around the intermediate hinge 4 and descends to protect the overhead wire 20.

Further, in the above-described technique, when the pin 9 is broken, the upper frame 2 is lowered, but the lower frame 3 is raised, and the intermediate hinge portion 4 may be damaged in a low tension.
Therefore, for example, as shown in FIG. 8, the pin 9 is made hollow and pressure air is supplied. When an excessive load is received, the pin 9 shears and breaks at the notch groove, and at the same time, the pressure air is exhausted. The pressure switch 14 installed in the vehicle detects a pressure reduction, controls the lowering cylinder of the current collector, and automatically It is also possible to perform a descent operation.
JP 2005-6390 A

The above-described conventional current collector with an overload detection device detects an overload on the current collector boat 1 by breaking the pin 9 due to an increase in the load of the balance rod 5. Even if the load in the traveling direction received by the current collector boat 1 is the same, the load varies greatly depending on the height of the action of the load of the current collector.
FIG. 9 shows an example of the relationship between the height of action and the balance rod load when a certain load is applied to the current collecting boat 1 in the traveling direction.
As shown in the figure, the load increases almost in proportion to the working height, and a large difference occurs depending on the working height. In other words, the external force received by the current collector boat 1 that breaks the pin 9 differs depending on the height of the current collector, so that a certain overload cannot be detected, and highly accurate detection cannot be performed.

Since the pin 9 at the lower end of the balancing rod of the conventional current collector with an overload detection device described above needs to be brittlely damaged when subjected to an overload, a notch using a material with low toughness (flexibility) should be used. It is necessary to have a structure having.
However, since the pin 9 is a strength member constituting the frame, it should not be damaged with respect to a load (hereinafter referred to as a steady load) applied to the current collector boat 1 during normal traveling. In order to set the detection load in the vicinity of the steady load, it is necessary to reduce the shear strength of the pin 9, and there is a possibility of causing a fatigue failure and erroneous detection even if no overload is applied. For this reason, the strength of the pin 9 needs to take a safety factor against fatigue, and the detected load cannot be set to a low value close to a steady load.

In the conventional current collector with an overload detection device described above, the set load that is regarded as an overload can be set by changing the shear strength of the pin 9, but in order to change the set load, the current collector is disassembled. Therefore, it is necessary to replace the pin 9 with a different shear strength, and the set load cannot be easily changed.
Even after the overload is detected, even if the current collecting boat 1 and the framework are small in damage and usable, the pin 9 is broken and cannot function as a current collecting device. Further, as described above, it is necessary to disassemble and recover the same as when the set load is changed, and workability is poor.
The present invention has been made to solve the above-described problems of the prior art, and the detection load is highly accurate, the detection load setting range is flexible, can be easily changed, and recovery after detection is easy. An object of the present invention is to provide a current collector with an overload detection device.

In the present invention, the above problem is solved as follows.
(1) A current collector boat is attached to one end, an upper frame provided with an intermediate hinge at the other end, one end is attached to the upper frame via the intermediate hinge, and the other end is attached to the underframe In the vehicle current collector, the following overload is made up of a lower frame, and a balancing rod having one end rotatably attached to the upper frame and the other end attached to the underframe via a bracket. A detection device is provided.
The bracket is pivotally supported on the base frame, and the balancing rod is pivotally supported with respect to the bracket.
An elastic body is provided between the bracket and the base frame, and the elastic body is bent in advance to give an initial biasing amount. That is, the bracket is not displaced relative to the frame until a certain load value in the traveling direction applied to the current collecting boat is set, and when the load exceeds a certain value, the bracket is displaced relative to the frame. The bracket is urged in a certain direction by the elastic body.
When the bracket is displaced, an air valve for releasing the pressure air to the atmosphere and a detection means for detecting that the pressure air is released to the atmosphere are provided, and the current collector is overloaded by the operation of the detection means. Detect that.
(2) In the above (1), the air valve includes a piston that serves as a plug for preventing pressure air from being released when the bracket is not displaced relative to the frame, and a cylinder in which the piston is fitted. And consists of
When the bracket is relatively displaced with respect to the frame, the piston is fixed to the cylinder, and the piston is released from the cylinder by the pressure air, and the pressure air is continuously released.
(3) In the above (1), the air valve includes a displacement sensor that detects the displacement of the bracket, a self-holding circuit that holds the output of the displacement sensor, and an electromagnetic valve that operates by the output of the self-holding circuit. .
And when the said bracket is displaced relatively with respect to a base frame, the said displacement sensor is operated, a solenoid valve is open | released, and it comprises so that pressure air may be discharge | released.
(4) In the above (1), (2), and (3), a substantially set load applied in the traveling direction of the current collector boat, regardless of the height of operation of the current collector, with respect to the pivot support position of the bracket on the base frame Thus, the bracket is selected so as to produce a relative displacement with respect to the frame.
Specifically, the product of the vertical distance between the pivot support position of the bracket to the frame of the bracket and the balance rod with respect to the load direction applied to the balance rod and the load applied to the balance rod is the load applied to the balance rod. Regardless of the working position in the height direction, the position of the pivot support on the bracket frame is selected so that it is always constant.
(5) In (1), (2), (3), and (4), a mechanism for adjusting the initial biasing amount of the elastic body is provided. Then, the initial biasing amount of the elastic body is adjusted by the mechanism, and a load in the traveling direction applied to the current collecting boat is set so that the bracket starts to be displaced with respect to the frame.

According to the present invention, as described below, the accuracy of the load to be detected is high, the setting of the load to be detected is easy, the detection load close to the steady load can be set, and the overload detection with high workability is possible. It is possible to provide an attached current collector, and it is possible to obtain a current collector suitable for a system that detects an overload on the current collector boat and automatically lowers the current collector.
(1) An elastic body is provided between the bracket and the base frame, and the bracket is not displaced relative to the base frame until the load in the traveling direction applied to the current collector boat is set to a certain value. When it exceeds, the elastic body urges it in a fixed direction so that it is displaced relative to the underframe, and when the bracket is displaced, the air valve releases pressure air to the atmosphere to detect overload. Therefore, the load applied to the current collector boat can be detected with high accuracy, and the protective operation can be performed.
Further, the load to be detected can be easily set by adjusting the biasing amount of the elastic body.
(2) The air valve is composed of a piston that serves as a stopper for preventing pressure air from being released when there is no relative displacement of the bracket, and a cylinder in which the piston is fitted. By returning to the original state, it is possible to easily restore the state before the overload detection.
Similarly, the self-holding circuit comprises the air valve comprising a displacement sensor that detects the displacement of the bracket, a self-holding circuit that holds the output of the displacement sensor, and an electromagnetic valve that operates according to the output of the self-holding circuit. By releasing the self-holding, it is possible to easily restore the state before the overload detection.
(3) The bracket is relatively displaced with respect to the underframe by a substantially set load applied to the current position of the current collecting boat regardless of the height of operation of the current collecting device. By selecting so as to generate an overload, it is possible to detect an overload when the same external force is applied to the current collecting boat regardless of the height of the external force applied to the current collecting boat.

FIG. 1 is a view showing a first embodiment of the present invention, and FIG. 2 is an enlarged view of a portion A in FIG.
In the figure, 1 is a current collector boat, 2 is an upper frame, the current collector boat 1 is attached to one end of an upper frame 2, and the lower frame is connected to the other end side of the upper frame 2 via an intermediate hinge 4. 3 is rotatably attached, and one end side of the counter bar 5 is rotatably attached to the other end of the upper frame 2 via a pin 5a.
Further, the other end (lower end) side of the lower frame 3 is pivotally supported by a support member 16 a attached to the base frame 16, and the other end (lower end) side of the balancing rod 5 is attached to the base frame 16. The bracket 6 is pivotally supported by a pin 8 and is pivotally supported by a pin 9.

FIG. 2 shows a detailed view of part A of FIG.
As shown in the figure, the lower end of a balancing rod 5, which is one of the elements constituting the framework that supports the current collector boat 1, is pivotally supported by a bracket 6 by a pin 9. The bracket 6 is rotatably supported on the frame 16 by pins 8, and an elastic body 7 composed of a spring or the like is attached between the bracket 6 and a support member 7 a erected on the frame 16. An adjusting screw 10 is provided between the elastic body 7 and the bracket 6.
The elastic body 7 urges the bracket 6 to rotate clockwise about the pin 8 as an axis. That is, when an excessive force is not applied to the balancing rod 5, the bracket 6 is in the state shown in FIG. 2, and the rotation is constrained by the moment around the pin 8 due to the elastic force of the elastic body 7. It has become. Further, the urging force of the elastic body 7 to the bracket 6 can be adjusted by the adjusting screw 10.

A fixing member 6a that functions as a stopper for the bracket 6 is attached to the underframe 16, and the piston 11 is fitted into a cylinder 6b provided on the fixing member 6a. A space 6c is provided between the cylinder 6b and the piston 11, and the space 6c communicates with the pipeline 6d. As shown in FIG. 1, the pipe 6d is connected to the air pressure source 15 via a pressure switch 14 and a throttle 15a.
The piston 11 is fixed to the bracket 6 with a stopper 12 fastened with a bolt 13, and when the piston 11 is fitted in the cylinder 6b, the space 6c is held at a predetermined pressure. That is, the piston 11 and the cylinder 6b constitute an air valve that holds the pressure air from the air pressure source 15 so as not to be released to the atmosphere.

As described above, the elastic body 7 is attached in a bent state so that the bracket 6 is rotated clockwise about the pin 8 as an axis, that is, an initial load is generated.
And even if the load below the detection load which acts on the current collecting boat 1 is received and the load of the balance rod 5 increases, the bracket 6 remains fixed to the frame 16 as shown in FIG.
Here, when an external force greater than the detection load is received, such as when the flying object 21 collides with the current collecting boat 1, the load applied to the counterbalance 5 increases. When the moment around the pin 8 becomes larger than the moment around the pin 8 due to the elastic force of the elastic body 7, the bracket 6 starts to rotate around the pin 8 in the direction of the arrow in FIG.
When the bracket 6 is rotated, the stopper 12 is removed from the piston 11 as shown in FIG. 3, and the piston 11 is released by the pressure air to enter the state shown in FIG. 3 and the air pressure is released, and the pressure switch 14 is operated to overload. Is detected.

Since the overload detection device of the present embodiment has the above-described configuration, when the overload is detected and then the load is removed, the bracket 6 returns to the original position by the elastic force of the elastic body 7. The piston 11 is released and does not return to its original state. However, even if an overload is detected, if the degree of damage of the current collector is light and there is no problem in use, the piston 11 can be recovered by simply returning the piston.
To return the piston, the bolt 13 is loosened, the stopper 12 is removed, the piston is returned to its original position, and fixed again with the stopper 12, and the recovery operation is extremely simple.
Further, even when the load on the current collecting boat 1 is impacted in a short time, such as a collision with a flying object, once the piston 11 is released, the pressure air is continuously released, so that the pressure air is reliably released. The pressure can be reduced and the pressure switch can be operated, and an overload can be reliably detected.
Furthermore, the load detected by the adjusting screw 10 can be easily set.

FIG. 4 is a diagram showing a second embodiment of the present invention. Only the method of releasing the pressure air is different from the first embodiment.
That is, a displacement sensor 17 for detecting the displacement of the bracket 6 is attached to the base frame 16, a self-holding circuit 18 that self-holds the output of the displacement sensor 17, a solenoid valve 19 that operates by the output of the self-holding circuit 18, and a pressure When the switch 14, the throttle 15a and the air pressure source 15 are provided and the electromagnetic valve 19 is opened, the pressure air from the air pressure source 15 is released to the atmosphere.
That is, in this embodiment, the displacement sensor 17, the self-holding circuit 18 and the electromagnetic valve 19 constitute an air valve that holds the pressure air from the air pressure source 15 so as not to be released to the atmosphere.
Other configurations are the same as those shown in FIG. 1, and a bracket 6 for pivotally supporting the lower end of the balancing rod 5, which is one of the elements constituting the frame for supporting the current collector boat 1, on the base frame 16. Is pivotally supported on the frame 16 by the pin 8, and as described above, the rotation is constrained by the moment around the pin 8 due to the elastic force of the elastic body 7 and is integrated with the frame 16.
The elastic body 7 is attached in a bent state in advance, that is, an initial load is generated. Even if the load of the balancing rod 5 is increased by receiving a load below the detection load acting on the current collector boat 1, the bracket 6 Remains fixed to the underframe.

Here, when an external force greater than the detection load is received, such as when the flying object 21 collides with the current collecting boat 1, the load on the counter rod 5 increases. When the moment around the pin 8 becomes larger than the moment around the pin 8 due to the elastic force of the elastic body 7, the bracket 6 starts to rotate around the pin 8. The displacement sensor 17 detects the rotational displacement of the bracket 6, the operation of the displacement sensor 17 is self-held by the self-holding circuit 18, and the electromagnetic valve 19 is opened.
When the solenoid valve 19 operates, the pressure air from the air pressure source 15 is released and the pressure is reduced, the pressure switch 14 is operated, and an overload is detected.
By providing the self-holding circuit 18 as described above, even when the load on the current collector boat 1 is impacted in a short time, such as a collision of flying objects, the pressure air is continuously released. Overload can be detected reliably.

Since the overload detection device of the present embodiment is configured as described above, as in the first embodiment, when the overload is detected and then the load is removed, the bracket 6 is restored to the original by the elastic force of the elastic body 7. Return to position. And even if an overload is detected, if the degree of damage of the current collector is light and there is no problem in use, it can be recovered by releasing the self-holding of the self-holding circuit 18, and the work is very simple. is there.
Even when the load on the current collecting boat 1 is impacted in a short time, such as a collision of a flying object, the operation of the displacement sensor 17 is held by the self-holding circuit 18 so that the pressure is continuously increased. In order to release air, the pressure can be reliably reduced, the pressure switch can be operated, and an overload can be reliably detected. Furthermore, the load detected by the adjusting screw 10 can be easily set.

Next, a measure for making it possible to detect a constant external force at any height of action in the configurations of the first and second embodiments will be described with reference to FIG.
As described above, the load change of the balancing rod due to the height of the current collector when the same external force is applied to the current collector boat 1 changes substantially in proportion to the height of the action as shown in FIG. Even if the balance rod load changes according to the height of action, the detected load can be made constant if the moment around the pin 8 is always constant.
For this purpose, the pin 8 is selected in such a position that the vertical distance change between the pin 8 and the balance rod 5 whose angle changes depending on the height of the operation is inversely proportional to the load change of the balance rod, and the balance between the balance rod load and the pin 8 is selected. This is possible by making the product of the vertical distances of the bars constant.
As shown in FIG. 5, the load of the balancing rod 5 at the position where the working height is high is F _A , the load of the balancing rod 5 at the low position is F _B , and the pin 8 with respect to the load direction applied to the balancing rod 5 When the vertical distances of the balancing bars 5 are α and β, the initial load of the elastic body 7 is F _K , and the vertical distance between the elastic body 7 and the pin 8 with respect to the urging direction of the elastic body 7 is γ, the following relationship By providing the center of the pin 8 at a position where the above holds, the detection load is constant regardless of the operating height, and high detection accuracy can be obtained.
F _A・ α ≒ F _B・ β ≒ F _K・ γ
The initial load by the elastic body 7 can be arbitrarily adjusted by changing the amount of deflection with the adjusting screw 10.

It is a figure which shows the 1st Example of this invention. FIG. 2 is a detailed view of part A in FIG. 1. It is a figure explaining the operation | movement about the 1st Example of this invention. It is a figure which shows the 2nd Example of this invention. In the Example of this invention, it is a figure explaining the policy for enabling it to detect fixed external force in any action height. It is a figure which shows the structure of the Example of a prior art. It is the 1st example of BB sectional view of Drawing 6. It is the 2nd example of BB sectional drawing of Drawing 6. It is a figure which shows an example of the relationship between the action height at the time of the load which has been loaded in the current collector, and the balance rod load.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Current collecting boat 2 Upper frame 3 Lower frame 4 Intermediate hinge 5 Balance rod 5a Pin 6 Bracket 6a Fixing member 6b Cylinder 6c Space 6d Pipe line 7 Elastic body 8 Pin 9 Pin 10 Adjustment screw 11 Piston 12 Stopper 13 Bolt 14 Pressure switch DESCRIPTION OF SYMBOLS 15 Air pressure source 16 Base frame 17 Displacement sensor 18 Self-holding circuit 19 Solenoid valve 20 Overhead wire 21 Projectile

Claims (5)

A current collector boat and an upper frame that supports the current collector boat, a lower frame having one end rotatably attached to the upper frame, and the other end rotatably attached to the underframe, and one end being the upper frame A vehicle current collector having a frame composed of a balancing rod that is pivotally attached to a frame and whose other end is attached to a frame via a bracket,
The bracket is pivotally supported on the underframe, and the balancing rod is pivotally supported with respect to the bracket.
Until the load in the traveling direction applied to the current collector boat is set to a certain value, the bracket is not displaced relative to the frame, and when the load exceeds a certain value, it is displaced relative to the frame. The bracket is biased in a certain direction by the elastic body,
When the bracket is displaced, an air valve for releasing the pressure air to the atmosphere and a detection means for detecting that the pressure air has been released to the atmosphere are provided, and the current collector is overloaded by the operation of the detection means. A current collector with an overload detection device for a rail vehicle. The air valve is composed of a piston that serves as a plug for preventing pressure air from being released when the bracket is not displaced relative to the frame, and a cylinder in which the piston is fitted.
When the bracket is relatively displaced with respect to the base frame, the piston is not fixed to the cylinder, and the piston is released from the cylinder by the pressure air, and the pressure air is continuously released. The current collector for a vehicle with an overload detection device for a railway vehicle according to claim 1. The air valve is composed of a displacement sensor that detects the displacement of the bracket, a self-holding circuit that holds the output of the displacement sensor, and an electromagnetic valve that operates according to the output of the self-holding circuit,
2. The railway vehicle according to claim 1, wherein when the bracket is relatively displaced with respect to the frame, the displacement sensor is operated to open the electromagnetic valve and release the pressure air. Vehicle current collector with overload detection device. The bracket is relatively displaced with respect to the underframe by the substantially set load applied in the traveling direction of the current collecting boat regardless of the height of operation of the current collector. The current collector for a vehicle with an overload detection device for a railway vehicle according to claim 1, wherein the vehicle current collector is selected as described above. A mechanism for adjusting an initial urging amount of the elastic body, and by adjusting the initial urging amount by the mechanism, the bracket starts to be displaced with respect to the underframe in a traveling direction applied to the current collector boat; 5. The vehicle current collector with a railway vehicle overload detection device according to claim 1, wherein the load can be set.

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