JPS5827724B2 - pantograph - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in the ability of an electric vehicle's puncture graph to follow overhead wires.

In general, catenary lines undergo relatively gradual large-amplitude displacement due to irregularities in the height of each support point of the catenary and sagging of the catenary between each support point, and changes due to pronation caused by wavy wear on the surface of the catenary. It has a sharp displacement with small amplitude.

Conventionally, a puncture graph as shown in FIG. 1 has been used to follow the displaced overhead wire and collect current effectively.

As shown in the figure, a pantograph frame 3 is supported on the roof 1 of an electric car via an insulating insulator 2.
- is pushed upward by the spring 4.

A current collector boat 7 is attached to the Punkgraph '03 so as to be in sliding contact with the overhead wire 6 via a restoring spring 5.

A link mechanism with a binge joint allows for a large movement upwards f on the puncture graph frame where the push-up blade is generated by the spring 4, and the push-up blade is configured so as not to change significantly.

Therefore, this portion has a large amplitude and is suitable for following the gradual change in displacement of the overhead wire.

However, the displacement of the overhead wire, which has a small amplitude and changes rapidly, cannot be followed because the inertia of the mass of the pangraph frame is large.

For this purpose, a restoring spring 5 is provided, and this restoring spring 5 can push up the collector boat 7, which has a relatively small mass, with a large acceleration, so that it can be used against a sudden change in displacement with a small amplitude. I am following you.

However, as the vehicle speeds up, the change in displacement due to irregularities on the surface of the catenary becomes even more rapid for the punk graph, making it impossible for the collector boat to follow the catenary even with the restoration splash.

In order to increase this followability, it is necessary to reduce the mass of the collector boat or increase the number of push-up blades.

The above-mentioned reduction in the mass of the current collector boat has a limit due to its mechanical strength, and there is a problem in that increasing the number of push-up blades increases wear on the overhead wires and the current collector boat.

In order to solve the above problem, we have developed a detection device that detects when it becomes difficult for the collector boat to follow the overhead wire due to a change in the contact force between the collector boat and the overhead wire, and this detection device A push-up device that pushes the current collector boat when the current collector is detected is provided between the restoration spring on the puncture graph frame and the current collector boat, and a timer mechanism that maintains the pushing-up operation of the push-up device for a certain period of time is provided. According to the provided puncture graph, in places where the displacement due to irregularities on the surface of the overhead wire is sudden, the pushing up device pushes up the collector boat, and as a reaction, the restoring spring is unnecessarily compressed and pushed [force, that is, the collector boat] It has been proposed to increase the tracking ability of the lifting device and restore the pushing operation of the lifting device after a certain period of time to bring the contact force between the overhead wire and the collector boat to a normal value, so as to prevent increased wear on the overhead wires and collector boat. There is.

FIG. 2 shows a schematic configuration of the above-mentioned proposed punk graph.

As shown in the figure, a punk graph frame 14- is supported on a roof 11 of an electric car via an insulating insulator 12, and the punk graph frame 11 is pushed upward by a spring 14.

A detection push-up device 1 which has a restoring spring 15 attached to a pantograph frame 1342 and a detection device and a push-up device integrated thereon
A current collector boat 17 is attached via 8.

The current collector boat 17 is in contact with the overhead wire 16.

FIG. 3 shows a schematic configuration of the main part of the punk graph shown in FIG. 2.

The detection device in this case is a detection device that detects disconnection when the contact force between the overhead wire 16 and the current collector boat 17 becomes small.

The “detection push-up device” is a piston 19 that pushes up the current collector boat 17.
and a poppet 20 coupled to the piston 19,
Furthermore, it has a cylinder 21 that forms an actuator together with the piston 19, and a main body 23 that has an opening 22 that forms an on-off valve together with the poppet 20.

The hydraulic power source 24 is connected to the opening portion 22 via a throttle valve 25 , and an accumulator 26 is connected between the throttle valve 25 and the opening portion 22 .

The cylinder 21 is connected to an atmospheric pressure tank 28 via a throttle valve 27, and the oil in the tank 28 is returned to the hydraulic pressure source 24.

The opening area of the throttle valve 25 is set to be considerably smaller than the opening area of the throttle valve 27.

The contact force when the collector boat is in sliding contact with the small amplitude and short wavelength displacement of irregularities on the surface of the overhead wire is the contact force caused by the push-up blade of the restoring spring compressed by the push-up blade of the punk graph frame. With Po (contact force when there is no unevenness on the surface of the overhead wire) as the center value, it fluctuates up and down by a value P~· corresponding to the steepness of the unevenness on the surface of the overhead wire.

As the unevenness increases, the fluctuation value Pv increases, and at the valley of the pulsation of the contact force, it becomes a value close to O, or becomes O, resulting in a deviation from the line.

In such a case, the force pushing down the poppet 20 becomes small, so the pressure of the oil in the opening 22 opens the on-off valve, and the FL force of the oil flowing into the cylinder 21 pushes up the piston 19, that is, the collector boat 17. , as a reaction to this push, the restoration splash 1
5 is compressed by the stroke of the piston 19, the push-up blade of the restoring spring 15, that is, the center value Po of the contact force is increased.

Therefore, the contact force increases, and the following ability of the current collector boat increases.

When the restoring spring 15 is unnecessarily compressed as described above, a force is generated that pushes down the punk graph frame 13, but the punk graph frame 13 does not fall suddenly due to its mass, and the punk graph frame 13 does not recover for a certain period of time. can be kept in an extra compressed state.

In the hydraulic circuit, oil flows into the cylinder 21 from the on-off valve and flows out into the tank 28 via the throttle valve 27, but this oil is mixed with oil from the hydraulic source 24 that has passed through the throttle valve 25 and oil released from the accumulator 26. A large amount of merging
, since this passes through the throttle ff27, a pressure difference is created before and after the throttle ff27, which gives pressure to the oil in the cylinder 21.

If the oil release time of the accumulator 26 is set at a certain time corresponding to the time the vehicle passes over a place where the overhead wire has steep irregularities, the tracking ability of the collector boat increases during that time.

When oil is no longer discharged from the accumulator 26, the only oil that passes through the throttle valve 27 is the oil from the hydraulic source 24 that has passed through the throttle valve 26.

Since the opening area of the throttle valve 25 is smaller than that of the throttle valve 27,
There is no pressure difference between the oil before and after the throttle valve 27, and the current collector boat 17
The piston 19, which had been pushing up the current collector, is lowered, the restoring spring 15 is no longer unnecessarily compressed, and the contact force between the overhead wire 16 and the collector boat 17 returns to its normal value.

As mentioned above, when the overhead wire passes through a sharply uneven area and the accumulator 26 stops emitting yuzu, the piston 19 descends, and the contact force between the overhead wire 16 and the collector boat increases in value at the trough of the pulsation. Therefore, the force pushing the poppet 20 downward becomes a force that overcomes the pressure of the oil in the opening 22 and pushes the poppet 20 downward.
closes the on-off valve.

When the opening valve is closed, the accumulator 26 accumulates oil due to the inflow from the hydraulic pressure source 24.

However, since the oil flows through the throttle valve 25, it takes time for the accumulator 26 to accumulate enough oil.
Ru.

During this time, if you come across a steeply uneven area on the next overhead wire, you may not be able to push the collector boat up, or even if you push the collector boat, the time to maintain the push-up action will be short. A disadvantage is that it may not be possible to increase the tracking ability of the collector boat.

This invention eliminates the above-mentioned drawbacks and increases tracking ability by holding the current collector boat for a certain period of time for each contact line even if there are steep unevenness points at short intervals. The purpose is to provide a pantograph that can.

According to the present invention, the above-mentioned object is to provide a detection device that detects the separation of the current collector boat based on a change in the contact force between the overhead wire and the current collector boat, and to push up the current collector boat when the detection device detects the separation from the line. In an electric car puncture graph in which a push-up device is provided between a restoring spring on a puncture graph frame and a collector boat, a timer mechanism is provided to maintain the pushing-up operation of the push-up device for a certain period of time and then quickly return to normal operation. This is achieved by providing a pantograph.

An actual case of this invention will be explained below based on FIG.

FIG. 4 shows a schematic configuration of the main part of a puncture graph according to an actual example of the present invention.

The detection push-up device 38 is similar to that shown in FIG. 3, and has a piston 39 that pushes up the current collector boat 37, a poppet 40 coupled to the piston 39, and a cylinder 41 that forms an actuator together with the piston 39, and a poppet 40. It has a main body 43 consisting of an opening 42 and the like that together with 40 form an on-off valve.

Pylon 14F50 (well, cylinder 53 that is slidingly engaged with spool 52 and spool 51)
It consists of a main body 54 having an inside.

The main body 54 has ports 55, 56, 57, and 5B.

59 are provided.

A port 55 is provided at the left end of the cylinder 53, which connects the lower part of the cylinder 41 and the left part of the cylinder 53 so that both are under the same pressure.

A port 56 is provided at the right end of the cylinder 53, thereby connecting the right side of the cylinder 53 to a tank 60 at atmospheric pressure.

The pilot valve 50 connects ports 57 and 58 when the spool 51 is located on the left side, and
When the port 57 is located on the right side, the port 57 and the port 59 are connected.

The port 57 is connected to a pilot port 75 of a sequence valve 70 (described later), the port 58 is connected to atmospheric pressure pressure, and the port 59 is connected to a hydraulic power source 62 via a throttle valve 61.

Further, the lower part of the cylinder 41 and the left side of the cylinder 53 are connected to atmospheric pressure 0 through a throttle valve 63.

The sequence valve 10 includes a spool 71 and a spool 7.
It consists of a spring 72 pushing the spool 1 to the left and a main body 74 having a cylinder 73 inside which is in sliding engagement with the spool 51.

The main body 74 has a pilot boat 75 and ports 76, 7.
7, 78, and 79 are provided.

That is, a pilot boat 75 is provided at the left end of the cylinder 73, and this is connected to the port 1- of the pylon Bi'50.
5 Connected to 7.

A port 76 is provided at the right end of the cylinder 73, and is connected to the atmospheric pressure terminal 0.

Sequence-170 connects ports 77 and 78 when the spool 71 is positioned to the left, and connects the ports 77 and 78 for most of its travel when the spool 71 moves to the right; The structure is such that port 78 is closed at the end of the stroke and ports 77 and 79 are connected.

Port 77 is connected to the opening 42 of the lifting device 3, port 78 is connected to the hydraulic source 62, and port 79 is connected to the atmospheric pressure
They are connected to each other.

Next, the operation of the above-mentioned punk graph will be explained.

When the current collector boat 37 is in sliding contact with a place where the overhead wire 36 has gentle irregularities, the pulsation of the contact force is small as described above, so the value of the valley does not become very small.

For this purpose, the main poppet 40 of the detection push-up device 1 has an opening 4.
2 is closed.

Further, since the F part of the cylinder 41 and the left part of the cylinder 53 are connected to atmospheric pressure pressure 0 through the throttle valve 63, the oil in these parts has no pressure.

Therefore, the spool 51 of the pylon T450 is splashed 52
The pilot boat 75 of the sequence Morisu is connected to the atmospheric pressure Kunkuro 0 through ports 57 and 58.

For this reason, the oil on the left side of the spool 71 has no pressure, so the spool 71 is pushed by the spring 72 and is positioned on the left side, and the pressure of the oil from the hydraulic source 62 passes through ports 78 and 77 to the opening 42. It has been reported.

The boppet 40 is pushed up by the pressure of the oil in the opening 42, but as mentioned above, where the overhead wire 36 has gentle irregularities, the pulsation of the contact force between the overhead wire 36 and the collector boat 37 is small, so the poppet 40 is opened. The section 42 is closed.

In other words, the detection push-up device is in a state where the current collector boat 37 is not pushed up.

Next, when the quadrupling on the surface of the overhead wire becomes sudden, the fluctuation of the contact force between the overhead wire 36 and the collector boat 37 becomes a dog as described above.
The value of the trough of the pulsation of the contact force becomes close to 0 or becomes 0, resulting in separation from the line.

In such a case, the force pushing the poppet 40 downward will be small, so the pressure of the oil in the opening 42 will open the poppet 40.
The pressure of the oil flowing into the cylinder 41 is used to push up the collector boat 37 with the piston 39 having a sufficiently large pressure receiving area to increase the tracking ability.

In this state, oil from the hydraulic source 62 flows through the port 78, the boat 77, the opening 42, the cylinder 41, and the throttle valve 63, so the amount of oil flowing out is smaller than the discharge capacity of the hydraulic source.

Therefore, a pressure difference is created between the oil before and after the throttle valve 63.

That is, the oil at the bottom of the cylinder 41 can be made to have pressure.

The oil pressure in the F part of the cylinder 41 is transmitted to the left side of the cylinder 53 from the boat 55 of the pilot valve 50, overcomes the force of the spring 52, and immediately moves the spool 51 to the right, connecting the boat 57 and the port 59.

When port 57 and port 59 are connected, oil under pressure from hydraulic source 62 flows through throttle valve 61, boat 59, and port 57.
The oil flows into the left side of the cylinder 73 from the pilot boat 75 of the sequence valve 70, overcomes the force of the spring 72, and moves the spool 71 to the right at a speed determined by the amount of oil passing through the throttle valve 61 and the cross-sectional area of the cylinder 73. let

Spool 71 closes boat 78 at the end of its stroke, connecting ports 77 and 79.

During the time until the spool 71 closes the port 78 described above, the hydraulic power source 62 is connected to the boat 78, the port 77, and the open section 4.
Since the piston 39 is connected to the lower part of the cylinder 41 via the piston 2, the piston 39 pushes down the current collector boat 37.

Note that the time from when the hydraulic pressure is applied to the port 75 of the sequence valve 70 until the spool 71 closes the boat 78 is determined by using a variable throttle valve with an adjustable opening area as the throttle valve 61 and adjusting the opening area of the throttle valve. It can be adjusted by adjusting.

Therefore, if this time is adjusted to a time that is safe for the vehicle to pass through a section where there are steep irregularities on the surface of the overhead wire, the push-L operation of the push device can be performed while the overhead wire is passing through the section where the irregularities occur. can be retained.

Spool 71 of sequence valve 70 moves to the right and closes port 78 at the end of its stroke, opening boats 77 and 79.
When the cylinders 41 and 53 are connected to each other, the cylinders 41 and 53 are connected to the atmospheric pressure via the opening 42, the boat 77, and the port 79, so the oil pressure in that area disappears, and the piston 39 down and open the poppet 40.
"it+" 42 is closed, and the spool 51 is also pushed by the spring 52 and moves to the left.

Furthermore, even if the poppet 40 closes the opening 42 before the spool 51 finishes moving to the left, the oil on the left side of the cylinder 53 escapes faster than the throttle valve 63 because the amount of oil on the left side of the cylinder 53 is small.
moves to the left.

When the spool 51 is located on the left side, the left side of the cylinder 73 of the sequence 10 is connected to the pilot boat 1-75 and the boat 5.
7. It is connected to the tank 60 at atmospheric pressure through a passage without a throttle valve through the port 58, and the oil can quickly flow out, so the spool 71 is pushed by the spring 72 and moves rapidly to the left. , the hydraulic power source 62 is opened via the boat 78 and the boat 7γ [
Connect to part 1 42.

Therefore, the oil in the open section 42 comes to have pressure.

In this practical example, the sequence valve that controls the opening and closing of pressurized oil supplied to the detection push-up device is controlled by a pilot valve that responds to the push-up operation of the detection push-up device, and the operation time limit of the sequence valve is controlled by a throttle valve. Since it is made to be visible, the push-up operation time can be kept constant, and when the time limit is reached, the sequence valve supplies JJn to the detection push-up device.
Since the pressure oil is cut off, effects such as the ability to quickly return the detection press device to its original state can be obtained.

Therefore, the tracking ability of the puncture graph is further improved.

FIG. 5 shows a schematic configuration of the main part of a bank graph according to another example of the present invention.

Detection push-up mounting %, IQ, pylon) valve 150, atmospheric pressure tank 160, throttle valve 161, hydraulic source 162, throttle valve 1
63 is similar to that of the pantograph shown in FIG.

The sequence valve 170 has a piston 171 and a piston 17.
1, a cylinder 173 that slides on the piston 171, a cylinder 174 that slides on the spool 172, and an oil reservoir 175 that has a larger cross section than the spool 172.
It consists of a main body 176 etc. having

The cross-sectional area of the piston 171 is set larger than the cross-sectional area of the spool 172.

The main body 176 has a pilot port 177 connected to the pilot valve ↓-50- at the left end of the cylinder 173, and a boat 17 connected to the hydraulic power source 162 at the right end of the cylinder 173.
8 and the opening 1 of the detection push-up device 136 in the cylinder 174.
42, and a bow 1-180 that connects the oil sump 175 to a tank 160 at atmospheric pressure.

A groove 181 is provided in the spool 172.

This groove 181 connects boats 178 and boats 1-179 when the spool 172 is located on the left side, and also connects boats 1-178 and boats 1-179 during most of the travel when the spool 172 moves to the right. -179,
At the end of the stroke, the boat 1-178 and the boat 179 are disconnected, and the boat 179 and the boat 180 are connected.

On the right side of the piston 171 of this sequence valve 170,
The force resulting from the area obtained by subtracting the cross-sectional area of the spool 172 from the cross-sectional area of the piston 171 and the pressure of the oil from the sweat source 162 always pushes the re-piston 171 and the spool 172 to the left.

Therefore, when the spool 151 of the pilot valve 150 is located on the left side, the pilot bow 1-177 is connected to the atmospheric pressure tank 160 by the pilot valve 150, and the oil on the left side of the piston 171 has no pressure, so the piston 171 and the spool 177 is located on the left.

In this state, the oil pressure from the hydraulic source 162 is transmitted to the opening 142 via the boat 178 and the boat 179.

When the detection push-up device performs a push-up operation, the spool 151 of the pilot valve 150 moves to the right, and the oil under the pressure of the hydraulic source 162 flows through the throttle well 161, the pilot valve 150, and the pilot boat 177 to the cylinder 173 of the sequence 170.
Since the pressure of this oil is applied to the entire area on the left side of the piston 171, it overcomes the force pushing the piston 171 from the right side, and the amount of oil passing through the throttle valve 161 and the cylinder 173
Piston 171 and spool 172 are moved at a speed determined by the cross-sectional area of .

The spool 171 moves to the right, and at the end of the stroke the boat 17
During a certain period of time until the connection between 8 and the boat 179 is cut off, the hydraulic power source 162 is connected to the detection push-up device 138 via the boat 178 and the boat 1-179, so the detection push-up device 1
Main 1- is performing a push-up motion.

When the spool 172 disconnects the boat 178 and the boats 1-179 and connects the boats 1 and 1γ9 with the boat 180, the tank 160 at atmospheric pressure
9 to the detection push-up device 13B, the detection push-up device 138 stops its push-up operation.

Then, the spool 151 of the pilot valve 150 moves to the left, connecting the pilot boat 177 to the atmospheric pressure tank 160 through a passage without a throttle valve, so that the piston 17
1 is pushed by the oil on the right side and rapidly moves to the left together with the spool 172.

This causes the detection push-up device and the timer mechanism to return to their original state and prepare for the next push-up operation.

In this practical example, not only the same effects as the embodiment shown in FIG. 4 can be obtained, but also the effect that the sequence valve 176 has a simple structure because it does not require a restoring spring.

FIG. 6 shows a schematic structure of a bank graph dissection according to another embodiment of the present invention.

Pilot valve - 25 mutually, atmospheric pressure tank 260 throttle valve 2
61, hydraulic power source 262, throttle valve 263, sequencer input 2-
70 is similar to that of the bank graph shown in FIG.

The detection push-up device 238 is a detection device that detects line separation when the peak value of the pulsation of the contact force between the overhead wire 236 and the current collector boat 237 becomes larger than a specified value, and a push-up device that pushes up the current collector boat by this detection device. It is composed of
A piston 239 that pushes up the collector boat 237 and a piston 2
39, a poppet 1-243 that opens when pushed by the protrusion 240 and has a spring 241 and a plunger 242 facing backwards, a main body 244, and the like.

The main body 244 forms an actuator together with the piston 239, and has a cylinder 246 with a bow 1-245 at the bottom, and an opening 247 that forms an on-off valve with the bow 1-243.
The range of movement is supported by the poppet 243, and the bow 1-2
An oil reservoir 249 having 48 is slidably fitted with the plunger 242,
It consists of a cylinder 251 and the like having a boat 250 at the bottom connected to an atmospheric pressure tank 260.

A boat 245 connects the lower part of the cylinder 246 to the pilot valve 255 and a throttle valve 263 in the same manner as the part of the cylinder 41 in FIG. The valve 2-L"- is connected in the same manner as in FIG. 4 except for the above.

Next, the operation of the bank graph written in L will be explained.

When the peak value of the pulsation of the contact force between the overhead wire 236 and the collector boat 237 is not large, the difference between the area of the opening 247 and the area of the plunger 242 is greater than the force of the protrusion 240 pushing the popetsu l-243. The pressure of the oil depending on the area and the splash 241 have a large force pushing up the popetsu l-243, so the popetsu l-
243 closes the opening 247.

Furthermore, since the lower part of the cylinder 246 is connected to the tank 260 at atmospheric pressure via the throttle valve 263, there is no pressure in the oil in this part.

Therefore, the piston 235 is not performing a pushing motion.

Also, the spool 256 of the pilot valve 255 is located on the left side, and the pilot bow 1-271 of the sequence valve 270 is located on the left side.
is connected to a tank 260 at atmospheric pressure and the spool 272 is located on the left side.

When the spool 272 is located on the left side, the oil sump 249 is connected to the hydraulic power source 262 through the sequence □ 270-, so that the oil therein has pressure.

When the peak value of the pulsation of the contact force between the overhead wire 236 and the collector boat 237 increases and the protrusion 240 pushes down the bopetsu l-243, oil with pressure flows into the lower part of the cylinder 246 and pushes the piston 239. At the same time as the poppet 243 is raised, the force determined by the oil pressure on the top surface of the poppet 243 and the cross-sectional area of the plunger 242 overcomes the force of the spring 241, pushing the poppet 243 down and keeping the opening 247 open.

Furthermore, the oil in the lower part of the cylinder 246 flows out from the throttle valve 263 into the tank 260 at atmospheric pressure, but the amount is limited to the oil pressure source 262.
Since the discharge capacity of the cylinder 246 is smaller than that of the cylinder 246, the oil at the bottom of the cylinder 246 can have pressure.

The pressure of the oil is transmitted to the pilot valve 255, moves the spool 256 to the right, and connects the pilot boat 271 of the sequence valve 270 to the hydraulic source 26 via the throttle valve 261.
2, the spool 272 moves to the right at a constant speed.

Therefore, the sequence valve 270 connects the oil sump 249 and the hydraulic source 2.
62 for a certain period of time, and therefore piston 2
39 presses down the collector boat 237, so after holding it for a certain period of time, the above connection is cut off and the oil reservoir 249 is connected to the tank 260 at atmospheric pressure.

When the oil sump 249 is connected to the tank 260 at atmospheric pressure, the oil pressure in the oil sump 249 and the lower part of the sill 246 disappears, and the poppet 243 springs into the opening 247 by the force of the spring 241.
is closed, and at the same time the piston 239 descends to finish pushing up the collector boat 237.

When the oil pressure at the bottom of the cylinder 246 disappears, the spool 256 of the pilot valve 255 moves to the left and connects the pilot boat 271 of the sequence valve 270- to the tank 260 of the atmosphere 1E, so the spool 272 quickly moves to the right. , and connect the oil reservoir 249 and the hydraulic power source 262.

This causes the detection push-up device 238 and the timer mechanism to return to their original state, and enter a standby state in preparation for the next push-up operation.

This embodiment also has the effect of being able to maintain the pushing up action of the pushing up device for a certain period of time, as well as allowing the pushing up device and the timer mechanism to return quickly, in a relatively short cycle, as in the two embodiments described above. A push-up motion can be performed.

In this embodiment, unlike the two actual cases described above, the detection push-up device employs a mechanism that detects line separation by increasing the contact force of the collector boat, so line separation is detected by decreasing the contact force. It also has the effect of improving manufacturing accuracy compared to mechanical ones.

Although oil is used as the working fluid in the embodiments of the present invention, air or other working fluids may be used in the present invention.

As described above, the puncture graph according to the present invention is equipped with a timer mechanism that maintains the lifting operation of the lifting device for a certain period of time and then quickly returns to normal operation. , the pushing up device can push up the collector boat for a certain period of time to increase the tracking ability.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of a conventional pantograph, FIG. 2 is a schematic diagram of a pantograph to which the present invention is applied, FIG. 3 is a schematic diagram of the main parts of the pantograph shown in FIG. 6 through 6 are schematic diagrams of the main parts of various embodiments of the punk graph according to the present invention. 3.13... Pantograph frame, 5,15...
...Restoration spring, 6, 16, 36, 236...
Overhead line, 7°17.37,237・・・Collection boat, 5
0,150°255...Pilot valve, 61,
161,261... Throttle valve, sheets, 170
, 2te''...Sequence valve, 75,177.
271...Pilot boat.

Claims (1)

[Scope of Claims] 1. A detection device that detects the separation of the current collection boat based on a change in the contact force between the overhead wire and the current collection boat, and a push-up device that pushes up the current collection boat when the detection device detects the separation of the current collection boat. In the electric car puncture graph, which is provided between a restoring spring on the puncture graph frame and a current collector boat, a timer mechanism is provided for holding the push-up operation of the push-L device for a certain period of time and then rapidly returning it. Punk graph featuring. 2. In the puncture graph as set forth in claim 1, the pushing up device comprises an actuator using pressure fluid,
In addition, the timing mechanism consists of a sequence valve, a throttle valve, and a pilot valve, and the pilot port of the sequence valve can be switched between connecting to a pressure fluid source with the throttle valve or connecting it to atmospheric pressure using the pilot valve. Features punk graph.