JPS5829683B2 - pantograph - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pantograph for a vehicle that collects current through sliding contact with an overhead wire.

In general, overhead wires have relatively gradual changes with large amplitudes due to irregularities in the height of each support point of the overhead wire and sagging of the overhead wire between each support point, and steep changes due to unevenness caused by wavy wear on the surface of the overhead wire. It has a small amplitude displacement.

Conventionally, a pantograph as shown in FIG. 1 has been used to properly collect current by following the displaced overhead wire.

A pantograph frame 3 is attached to the roof 1 of the vehicle via an insulating insulator 2.
is supported, and this pantograph frame 3 is supported by a push-up spring 4
is pushed upward by

A current collector boat 7 is mounted on the pantograph frame 3 so as to be in sliding contact with the overhead wire 6 via a restoring spring 5.

The pantograph frame 3, which generates a push-up blade by a spring 4, can be moved vertically by a link mechanism having a pin joint, and is configured so that the push-up force does not change greatly.

Therefore, this pantograph can sufficiently follow the displacement of the overhead wire, which changes slowly even if the amplitude is large.

However, the pantograph frame 3 cannot follow the large inertia of the mass of the pantograph frame 3 due to the large inertia of the mass of the pantograph frame 3, even if the amplitude is small due to irregularities on the surface of the overhead wire, and the displacement of the overhead wire changes rapidly.

A restoring spring 5 is provided in order to improve the ability of the pantograph to follow the displacement of the overhead wire, which changes rapidly even if the amplitude is small. It is made to be able to be pushed up so that it can follow a displacement with a steep change and a small amplitude.

However, as the vehicle speeds up, the change in the displacement of the catenary due to irregularities on the catenary's surface becomes even steeper, so even with the restoring spring it is no longer possible to make the collector boat follow the catenary.

When the pantograph is no longer able to follow the overhead wires, the wires repeatedly leave and land on the wires, causing arcs.This not only increases wear and tear on the overhead wires and collector boats, but also causes radio wave interference due to the arcs. Since it generates noise due to sound and mechanical noise associated with arrival and departure lines, it has a negative impact on the area around the line.

Therefore, it is strongly desired to improve the tracking ability of pantographs at high speeds and reduce the occurrence of line separation, not only to improve the current collection performance of pantographs but also to reduce the negative impact on the surrounding areas. ing.

In order to meet these demands, conventional efforts have been made to reduce the mass of the collector boat or increase its pushing force, thereby increasing the response speed of the collector boat to the displacement of the catenary and making it possible to follow the boat at high speed. Efforts have been made to improve gender.

However, there is a limit to the amount by which the mass of the current collector can be reduced in order to obtain the mechanical strength and characteristics required for the current collector.

Additionally, the contact force between the overhead wire and the current collector boat is increased by increasing the push-up force (this increases wear on the overhead wire and the current collector boat, so there is a limit to the increase in the push-up force).

For this reason, it is quite difficult to improve the followability of the pantograph even more than it is currently possible.

An object of the present invention is to overcome such difficulties and provide a pantograph that has good followability at high speeds and less occurrence of disconnection.

The above object is to provide a pantograph which collects current through sliding contact with an overhead wire according to the present invention, and a detection device for detecting disconnection between the collector boat and the overhead wire based on a change in the contact force between the overhead wire and the collector boat. A push-up device that pushes up the collector boat when track separation is detected is provided between the restoring spring on the pantograph frame and the collector boat, and a timer mechanism that holds the push-up operation of the push-up device for a certain period of time and a push-up device that pushes up the collector boat when a line separation is detected. This can be achieved by providing a push-up force increasing device that increases the push-up blade of the pantograph frame in conjunction with the push-up operation.

Embodiments of the present invention will be described below based on the drawings.

FIG. 2 is a schematic diagram of the entire pantograph according to an embodiment of the present invention.

A pantograph frame 13 is supported by an insulating insulator 12 fixed to a roof 11 of the vehicle, and the pantograph frame 13 is pushed upward by the contractile force of a spring 14.

A detection push-up device 18 is constructed by integrating a detection device for detecting line separation and a push-up device between the restoring spring 15 on the pantograph 13 and the current collector boat 17 that is in sliding contact with the overhead wire 16.
is provided.

The pushing-up force increasing device 19 is connected to the pantograph frame 13 by a pin joint 20 and a pin joint 21, and operates in a direction to shorten the distance between the pin joint 20 and the pin joint 21 to increase the pushing blade of the pantograph frame.

FIG. 3 shows an example of the pantograph shown in FIG. 2 in which a detection device is used to detect line separation by detecting that the contact force between the overhead wire and the collector boat has become smaller than a specified value. FIG. 2 is a schematic configuration diagram showing the main parts of a pantograph.

The detection push-up device 28 includes a main body 34 having a cylinder 32 and a valve opening 33, a piston 36 that hydraulically pushes up the collector boat 27 through a rod 35, and a poppet 37 that is coupled to the piston 36 and forms an on-off valve with the opening 33. It consists of etc.

Furthermore, the main body 34 has an inlet 38 communicating with the opening 33 of the on-off valve, and an outlet 39 in the lower part of the cylinder 32.

The hydraulic power source 40 is connected to the inlet 38 via a throttle valve 41, and an accumulator 42 is connected between the throttle valve 41 and the inlet 38.

The accumulator 42 includes a cylinder 43 and a piston 44.
and a spring 45.

The outlet 39 is connected to a tank 47 at atmospheric pressure via a throttle valve 46, and the oil in the tank 47 is returned to the hydraulic source 40.

The opening area of the throttle valve 41 is set to be considerably smaller than the opening area of the throttle valve 46.

The lifting force increasing device 29 is an actuator having a cylinder 48, an oil inlet/outlet 49 at the right end thereof, and a piston 51. The main body 50 is connected to the pantograph frame 23 by a pin joint 30, and the piston 51 is connected to the pantograph frame 23 by a pin joint 31.

The inlet/outlet 49 is connected to the outlet 39 of the detection push-up device 28 and the throttle valve 4.
6.

Next, the operation of the pantograph of the above embodiment will be explained.

When the collector boat 27 is in sliding contact with the upwardly facing concave portion A of the overhead wire 26 shown in FIG. The contact force between the overhead wire 26 and the current collector boat 27 is large, and separation from the line does not occur.

However, when the collector boat 27
When the current collector boat 27 is in contact with the current collector boat 27, an acceleration is applied to the current collector boat 27 in the same direction as the push-up direction of the upper restoring spring 27, so that the contact force decreases and line separation occurs.

Therefore, the collector boat 27
Consider the case where the two are in sliding contact.

The push-up blade of the restoration spring 25 is P, the contact force between the overhead wire 26 and the current collector boat 27 is F, the total mass of the current collector boat 27, the rod 35, the piston 36, and the poppet 37 is Ml, and the detection push-up device 2
The mass of the main body 34 of 8 is M2, the upward acceleration on the surface given by the downward convex portion B of the overhead wire 26, that is, the upward acceleration necessary for the current collector boat 27 to follow the overhead wire, is A, and the upward acceleration of the opening/closing valve is Letting Pl be the force that pushes up the poppet 37 due to the hydraulic pressure of the opening 33 and the contact force with the valve seat, the following equation is established from the relationship between the force S, acceleration, and mass.

■The following formula holds true.

The following equation holds true from equations ■ and equation ■.

If the force for pushing up the poppet 37, which is determined by the area of the opening 33 of the opening/closing valve of the detection push-up device 28 and the pressure of the oil in the opening 33, is set to P2, which is slightly larger than p Ml- in the formula (■), then It becomes like this.

In other words, when the irregularities of the overhead wire 26 are gentle, the apparent acceleration A given by the overhead wire is small, so F according to the formula
becomes larger.

When the value of F is large, Pl becomes a larger value than P2 according to the formula (■), the on-off valve closes, and the collector boat 27 and the detection push-up device 28 work together to follow the irregularities of the overhead wire 26 by the push-up blade of the restoring spring 25. On the other hand, since the on-off valve is closed, oil flows into the accumulator 42, overcomes the force of the spring 45, and pushes the piston 44 to the right, so that the accumulator 42 is in a state where oil is accumulated in the cylinder 43.

Similarly to the oil in the cylinder 62, the oil in the cylinder 48 of the push-up force increasing device 29 has no pressure because it communicates with the atmospheric pressure tank 47 via the throttle valve 46.

Therefore, the pantograph frame 23 is pushed up only by the force of the spring 24.

When the unevenness of the overhead wire 26 becomes steep, the apparent upward acceleration A given by the downward convex portion becomes a dog. According to the formula ■, the value of F becomes smaller and approaches the line separation, and A becomes larger and P becomes (M1 + M2) If A becomes a dog, the collector boat 27 will not be able to follow the unevenness of the overhead wire 26.

However, before that, Pl becomes smaller than P2, so the on-off valve opens and oil flows into the cylinder 32, pushing up the piston 36, that is, the collector boat 27.

As a reaction to this pushing up, the restoring spring 25 is activated by the piston 36.
Since it is compressed by the stroke of Become.

When the restoring spring 25 is further compressed as described above, the difference in force between this force and the push-up blade by the spring 24 is applied downward to the pantograph frame 23, but the pantograph frame 23 does not fall down suddenly due to the inertia of its mass. .

However, if the time exceeding this inertia elapses, the frame 23 will descend, so in order to prevent this, oil at the same pressure as the cylinder 32 of the detection push-up device 28 is supplied to the push-up force increasing device 29 from the inlet/outlet 49. The piston 51 is pushed to the left, and the push-up force increasing device 29 acts to increase the force that reduces the distance between the pin joints 30 and 31, that is, the push-up edge of the pantograph frame 23.

For this reason, the pantograph frame 23 does not go down, and the restoring spring 25
can be kept in an extra compressed state.

In addition, by increasing the pressure receiving area of the piston 51, the restoring spring 25 can be further compressed and a larger upward acceleration can be applied to the current collector boat 27.

In the hydraulic circuit, the oil that flows into the cylinder 32 from the on-off valve flows out from the outlet 39 through the throttle valve 46 and into the tank 47, but after the oil accumulated in the accumulator 42 is released, the oil pressure source passes through the throttle valve 41. 40 and the oil discharged from the accumulator 42 are combined and a large amount of oil passes through the throttle valve 46, creating a pressure difference before and after the throttle valve 46.
The oil in the cylinder 32 has pressure, and the force generated by the pressure of this oil and the sufficiently large area of the piston 36 pushes up the collector boat 27, and the reaction causes the restoring spring 25 to move an additional 360 strokes per screw. Compress.

The oil in the cylinder 48 of the push-up force increasing device 29 also has a pressure similar to the oil in the cylinder 32, and increases the push-up edge of the pantograph frame 23.

When the oil is no longer discharged from the accumulator 42, the oil passing through the throttle valve 46 is transferred to the hydraulic source 40 through the throttle valve 41.
Only the oil from above is used.

Since the opening area of the throttle valve 41 is smaller than that of the throttle valve 46, there is no difference in oil pressure before and after the throttle valve 46.

Therefore, the pressure of the glaze in the cylinder 32 disappears, the piston 36 descends, the poppet 37 closes the on-off valve, the oil pressure in the cylinder 48 disappears, and the pantograph frame 2
The push-up blade 3 is only driven by a spring 24.

Therefore, unnecessary compression of the restoring spring 25 is eliminated, and the contact force between the overhead wire 26 and the current collector boat 27 becomes a normal value.

FIG. 4 shows the main parts of a pantograph of an embodiment in which a detection device for detecting disconnection when the contact force between the overhead wire and the collector boat becomes larger than a specified value is used in the pantograph shown in FIG. 2. FIG.

The detection push-up device 58 includes a piston 66 that pushes up the collector boat 57 with oil pressure through a rod 65, a poppet 67 that has a spring 83 and a plunger 84 on the back side that is pushed open by a protrusion 82 provided on the piston 66, and a piston. A cylinder 62 which together with 66 forms an actuator and has an outflow port 69 at the bottom, and an opening 63 which forms an on-off valve together with a poppet 67 and an inflow port 68 which gives a movable range to the poppet 67.
It has a main body 64 consisting of an oil reservoir 85 and a cylinder 87 which corresponds to the plunger 84 and has a release port 86 at its lower part.

The hydraulic power source 70 is connected to the inlet 68 via a throttle valve 71, and an accumulator 7 is connected between the throttle valve 71 and the inlet 68.
2 are connected.

The accumulator 72 has a cylinder 73, a piston 74 and a spring 75.

The outlet 69 is connected to a tank 7T at atmospheric pressure via a throttle valve 76.

Since the release port 86 is connected to the tank 77, the cylinder 87 is maintained at atmospheric pressure.

The opening area of the throttle valve 71 is set to be considerably smaller than the opening area of the throttle valve 76.

The push-up force increasing device 59 is an actuator having a cylinder 78, an oil inlet/outlet lower 9 at its right end, and a piston 81. The main body 80 is connected to the pantograph frame 53 by a pin joint 60 and the piston 81 by a pin joint 61, respectively.

Further, the inlet/outlet γ9 is connected between the outlet 69 of the detection push-up device 58 and the throttle valve 76.

Next, the operation of the pantograph of the above embodiment will be explained.

A collector boat 57 is placed on the downward convex portion B of the overhead wire 56 in FIG.
When the current collector boat 57 is in sliding contact with the current collector boat 57, an upward acceleration Bu is required in order to follow the current collector boat 57 without leaving the track.

While Bu is smaller than the acceleration that can be applied to the current collector boat 57 by the push-up blade Q of the restoring spring 55, the current collector boat 5T follows the overhead wire 56.

The upward acceleration Bu necessary to follow the sudden irregularities of the overhead wire is applied to the current collector boat 5 by the push-up blade Q of the restoring spring 15.
If the acceleration is greater than that which can be applied to 7, disconnection will occur.

The collector boat 51 that is away from the line is accelerated by the push-up blade Q of the restoring spring 55, increases its upward speed, and arrives at the overhead wire 56.

Due to the impact at this time, that is, due to the momentum of the current collector boat 57, a large contact force is temporarily generated between the overhead wire 56 and the current collector boat 57.

In addition, when the collector boat 57 is in sliding contact with the upward concave portion of the overhead wire 56, the collector boat 57 moves against the push-up blade Q of the restoration spring 55.
7 must be given downward acceleration Bd, so overhead wire 5
6 and the collector boat 57 is large, and the steeper the unevenness of the overhead wire, the larger the downward acceleration Bd and the larger the contact force G becomes.

These relationships will be explained below.

Current collector boat 57, rod 65, piston 66, and protrusion 82
The total mass of is N1, the mass of the main body 64 of the detection push-up device 58 is N2, and the contact force between the protrusion 82 and the poppet 67 is Ql. Since the mass of the poppet 67 is small, it can be ignored for the sake of simplicity. The following equation is established from the relationship between force, acceleration, and mass.

From equations 0 and 0, the following equation holds true.

When the collector boat 57 is in sliding contact with the downward convex portion of the irregularities of the overhead wire 56, the following equation holds true.

Q-G-(N1+N2)Bu ・・・・・・・・・
... ■At the limit where the collector boat 57 leaves the track, G=0 and the following equation holds true.

Q=(N1+N2)Bu ・・・・・・・・・
...[Phase] In the unevenness of the overhead wire 56 with the same steepness, the curvature of the downward convex part and the upward concave part is equal to X, so the accelerations Bu and Bd in each direction are equal in magnitude to g, and this and 0 From the formula and the [phase] formula, when the unevenness of the overhead wire 56 is at the limit steepness that causes the collector boat to leave the line at a downward convex portion, the contact force G is the same as the push-up blade Q of the restoring spring 55 at the upward concave portion before and after it. is x2 times.

At this time, the contact force Q1 between the protrusion 82 and the poppet 67 is OH
From formula 2, it becomes KQ+Q.

Opening of the on-off valve N1 + N2 The force generated by the difference in cross-sectional area between the part 63 and the plunger 84 and the pressure of the oil in the oil reservoir 85 plus the force of the spring 83 to push the poppet 67 upward is a little less than the above 2 Q + Q□ Set it to a small value, Q2, and get N1+N2 (as shown below).

That is, when the irregularities of the overhead wire 56 are gentle, the downward acceleration Bd applied to the collector boat 57 at the upward concave portion is small, and therefore, as is clear from equation 0, (G-Q) is sufficiently smaller than Q.

In this state, according to formula 0, Ql is a smaller value than Q2,
Since the poppet 67 remains closed X, the current collector boat 57 and the detection push-up device 58 work together to follow the unevenness of the overhead wire 56 by the push-up blade Q of the restoring spring 55, while the poppet 67 is closed in the accumulator 72. When oil flows into the spring 75
The piston 74 is pushed to the right, and the accumulator 72 is in a state where oil is accumulated in the cylinder 73.

Further, the oil in the cylinder 73 of the lifting force increasing device 59, like the oil in the cylinder 62, has no pressure because it communicates with the atmospheric pressure tank 47 via the throttle valve 76.

Therefore, the pantograph frame 53 is pushed up only by the force of the spring 54.

When the unevenness of the overhead wire 56 becomes steep, the upward acceleration Bu required to follow the downward convexity increases, and the pushing up blade Q of the restoring spring 55 can apply the acceleration Bu to the current collector boat 57. If I can't do it, I'll be off track.

Correspondingly, the downward acceleration Bd applied to the collector boat 57 increases in the upward concave portion, and therefore the contact force G between the overhead wire 56 and the collector boat 57 increases, and at the limit where line separation occurs, the contact force G is the push-up blade Q of the restoring spring is g2 times, and the contact force Q1 between the protrusion 82 and the poppet 67 is g2 Q + Q according to the formula 0. As mentioned above, the poppet N, +
N2 2 67 push-up blade has a value N1 slightly smaller than Q+Q
Since it is set to +N2 Q2, when the collector boat 57 is sliding in contact with a point whose steepness is slightly smaller than the steepness of the unevenness of the overhead wire that causes line separation, the poppet 67 is pushed down and the on-off valve opens. .

Further, even if the current collector boat 57 leaves the line, a large contact force G is temporarily applied to the current collector boat 57 due to the impact when it arrives at the line, pushing down the poppet 67 and opening the on-off valve.

When the on-off valve opens, oil flows into the cylinder 62 and the piston 6
6, that is, the current collector boat 57 is pushed up.

As a reaction to this pushing up, the restoring spring 55 is activated by the piston 66.
Since the stroke is further compressed, the push-up blade of the restoring spring 55 increases and can give a large upward acceleration to the collector boat 57, so that the collector boat 5 can overcome sudden irregularities in the overhead wire 56.
7 will be able to follow.

As mentioned above, when the restoring spring 55 is unnecessarily compressed, the difference in force between this force and the push-up blade caused by the spring 54 is applied downward to the pantograph frame 53, but the pantograph frame 53 does not fall down suddenly due to the inertia of its mass. .

In addition, oil with the same pressure as the cylinder 62 of the detection push-up device 58 flows into the push-up force increasing device 59 from the inlet/outlet 49 to push the piston 81 to the left, and the push-up force increasing device 59 shortens the distance between the pin joint 60 and the pin joint 61. The force, that is, the push-up blade of the pantograph frame 53 is increased.

For this reason, the pantograph frame 53 does not go down and the restoring spring 55
can be kept in an extra compressed state.

By increasing the pressure-receiving area of the piston 81 (and further increasing the push-up blade of the pantograph frame 53), the restoring spring 55 can be further compressed to give even greater upward acceleration to the collector boat 57. .

In the hydraulic circuit, oil that flows into the cylinder 62 from the on-off valve flows out from the outlet 69 through the throttle valve 76 and into the tank 77, but while the oil accumulated in the accumulator 72 is being discharged, the oil pressure that passes through the throttle valve 71 A large amount of oil, which is a combination of the oil from the source 70 and the oil released from the accumulator 72, passes through the throttle valve 76, creating a pressure difference before and after the throttle valve 76. The force generated by the sufficiently large area of the piston 66 pushes up the collector boat 57, and as a reaction, the restoring spring 55 is compressed by an additional stroke of the piston 66.

Since the bottom of the plunger 84 is still open to atmospheric pressure, the poppet 67 pushed down by the protrusion 82 is moved by a force determined by its cross-sectional area and the pressure of the oil in the oil reservoir 85, which is equal to g in the cylinder 62. It is pressed down by compressing the spring 83.

The oil in the cylinder 78 of the push-up force increasing device 59 has a pressure similar to the oil in the cylinder 62 of the detection push-up device 58,
The number of push-up blades of the pantograph frame 53 is increased.

When the oil is no longer discharged from the accumulator 72, the oil passing through the throttle valve 76 is transferred to the hydraulic source 70 through the throttle valve 71.
Only the oil from above is used.

Since the opening area of the throttle valve 70 is smaller than that of the throttle valve 76, there is no difference in oil pressure before and after the throttle valve 760.

Therefore, the pressure of the oil in the cylinder 62 disappears, the piston 66 descends, the poppet 67 closes the on-off valve by the force of the spring 83, the pressure of the oil in the cylinder 78 disappears, and the push-up blade of the pantograph frame 53 is moved by the force of the spring 54. Only those due to

Therefore, unnecessary compression of the restoring spring 55 is eliminated, and the contact force between the overhead wire 56 and the current collector boat 5T becomes a normal value.

FIG. 5 is a schematic configuration diagram showing the essential parts of the pantograph of an embodiment in which a sequence valve is added to operate the lifting force increasing device in the pantograph shown in FIG. 3 in conjunction with the lifting operation of the lifting device. .

Similar to the one shown in FIG. 3, a detection push-up device 12 having a cylinder 132, a piston 136, an outlet 139, etc.
8 is provided between the restoring spring 125 on the pantograph frame 123 and the collector boat 127, has a hydraulic power source 140, and has a throttle valve 1.
41, an accumulator 142, a throttle valve 146, etc., and a cylinder 148, and a push-up force increasing device 129 having an inlet/outlet 149, a piston 151, etc. at the right end of the cylinder 148.

It also has a sequence valve 160 in addition to the one shown in FIG.

The sequence valve 160 consists of a main body 162 whose interior is a cylinder 161, a spool 163, a spring 164, and the like.

The main body 162 includes a cylinder 132 of the detection push-up device 128.
An inlet/outlet 16 connected to an outlet 139 at the lower end of the
5, an inlet/outlet 166 connected to the right end inlet/outlet 149 of the cylinder 148 of the push-up force increasing device 129, an inlet/outlet 167 connected to the atmospheric pressure tank 147, and an inlet/outlet 168 connected to the hydraulic source 140. ing.

Next, the operation of the above pantograph will be explained.

When the contact between the overhead wire 126 and the collector boat 127 is greater than a specified value because the irregularities of the overhead wire 126 are gentle, the detection push-up device 128 does not push up the collector boat 127.

At this time, the oil in the cylinder 132 has no pressure, so the oil in the cylinder 161 of the sequence valve 160 connected thereto also has no pressure.

For this reason, the spool 163 is moved to the left by the force of the spring 164.

In this state, the sequence valve 160
Since the inlet/outlet 166 connected to the cylinder 148 of No. 9 is connected to the inlet/outlet 167 connected to the atmospheric pressure tank 147, the oil in the cylinder 148 becomes atmospheric pressure, and the pushing force increasing device 129 pushes up the pantograph frame 123. Does not increase the blade.

When the irregularities of the overhead wire 126 become sharp and the contact force between the overhead wire 126 and the current collector boat 127 becomes thicker than the specified value (when this happens, the detection push-up device 128 performs a push-up operation and the oil in the cylinder 132 has pressure, Therefore, the oil in the cylinder 161 also has pressure, which overcomes the force of the spring 164 and moves the spool 163 to the right, connecting the inlet/outlet 166 and the inlet/outlet 168.
Since the cylinder 148 is connected to the hydraulic power source 140, the push-up force increasing device 129 can increase the push-up blade of the pantograph frame 123.

When the oil from the accumulator 142 stops being discharged, the push-up operation of the detection push-up device 128 ends, the spool 163 of the sequence valve 160 moves to the left, the oil pressure in the cylinder 148 disappears, and the push-up force increase device 129 also moves to the pantograph frame. 123 push-up blades should be increased.

FIG. 6 shows a schematic diagram of another embodiment of the sequence valve.

This sequence valve 260 includes a spool 262 having a piston 261 and a cylinder 263 corresponding to the piston 261.
and a cylinder 264 corresponding to the spool 262 and a body 26 having an oil sump 265 with a cross section larger than the cross section of the spool.
It consists of 6 mag.

The pressure receiving area of the piston 261 is set to be sufficiently larger than the pressure receiving area of the spool 262.

The main body 266 has an inlet/outlet 267 at the left end of the cylinder 263 connected to the cylinder of the lifting device of the collector boat, and an inlet/outlet 267 at the right end of the cylinder 263 connected to the atmospheric pressure tank.
68, an inlet/outlet 269 connected to the cylinder of the lifting force increasing device in the cylinder 264, and an inlet/outlet 270 connected to the oil sump 265 to a hydraulic power source.

A groove 271 is provided in the spool 262, and when the spool 262 moves to the left, an entrance/exit 268 and an entrance/exit 269 are formed.
If the spool 262 moves to the right, the entrance 26
9 and the entrance/exit 270 are connected.

When the above sequence valve is connected in the same manner as the sequence valve shown in FIG. 5, the result will be as described below.

When the lifting device is not pushing up the collector boat, there is no pressure in the oil in the cylinder, so piston 2
The oil on the left side of 61 has no pressure, and the spool 262 is pushed by the oil from the hydraulic source and moves to the left, connecting the inlet/outlet 268 and the outlet 269 to bring the oil in the cylinder of the uplift force increasing device to atmospheric pressure. and the push-up force increasing device is in a non-operating state.

When the push-up device pushes up the collector boat, the pressure of the oil in the cylinder is transmitted to the oil on the left side of the piston 261, and this pressure is applied to the piston 261, which has a sufficiently large pressure receiving area, and this force is applied to the right end of the spool 262. By overcoming the force of the oil from the applied hydraulic source and moving the spool 262 to the right and connecting the inlet/outlet 269 and the inlet/outlet 270, the pressure of the oil from the hydraulic source is introduced into the oil in the cylinder of the uplift force increasing device. This allows the number of push-up blades for the pantograph frame to be increased.

As described above, the push-up force increasing device can increase the number of push-up blades of the pantograph frame in conjunction with the push-up operation of the push-up device via the sequence valve shown in FIG.

In the case of the Pandagraph, which is a detection device shown in Figure 4 that detects line separation when the contact force between the overhead wire and the collector boat becomes larger than a specified value, the uplift force increasing device also uses a sequence valve. Through this, the number of push-up blades of the pantograph frame can be increased in conjunction with the push-up operation of the push-up device.

In the pantograph shown in Figures 3 and 4, which does not have a sequence valve, when the pantograph frame moves up and down when the lifting device is not operating, oil enters and exits the cylinder of the lifting force increasing device through the throttle valve. Therefore, some resistance may be provided to the sudden vertical movement of the pantograph frame, and pressure may be applied to the oil in the cylinder of the push-up device, causing a push-up operation.

However, in a pantograph with a sequence valve, the above-mentioned problem does not occur.

In the pantograph according to the present invention, the time for which the timer mechanism maintains the pushing-up operation of the pushing-up device is set to a certain period of time that corresponds to the time required for the overhead wire to pass through a location where sharp irregularities are continuously present. , it is possible to significantly increase the ability of the collector boat to follow irregularities in the overhead wire.

In addition, the restoring spring is supported not only by the inertia of the mass of the pantograph frame (but also by the pushing-up force increasing device), so the setting time of the timer mechanism can be set for a sufficiently long time.

The pantograph according to the present invention configured as described above includes a detection device that detects when the collector boat is out of line or close to leaving the line due to a change in the contact force between the overhead wire and the collector boat, and a detection device that detects the above-mentioned fact. A push-up device that pushes up the collector boat when the boat is pushed up when Since it has a lifting force increasing device that increases the pushing blade of the pantograph frame in conjunction with the movement, the collector boat increases its tracking ability in areas where there are steep irregularities in the overhead wire, generating arcs and causing radio wave interference. ,
Arc Sound 2 Mechanical noise is unlikely to have a negative impact on the surrounding area.

Further, since the contact force between the overhead wire and the collector boat is increased only at steeply uneven areas of the overhead wire, the wear of the overhead wire and the collector boat is hardly increased compared to the conventional pantograph.

Therefore, the increase in the number of replacements of overhead wires and collector boats will be small.

Although oil is used as the working fluid in each of the above embodiments, the present invention is not limited thereto, and it is of course possible to use a gaseous fluid such as air.

[Brief explanation of the drawing]

FIG. 1 is a schematic block diagram of a conventional pantograph, FIG. 2 is a schematic block diagram of the entire pantograph according to an embodiment of the present invention, and FIGS. 3 to 5 are main parts showing different embodiments of the present invention. FIG. 6 is a schematic diagram of another embodiment of the sequence valve, and FIG. 7 is a vertical cross-sectional view of an overhead wire used for explaining the present invention. 13.23, 53, 123: Pantograph frame, 15.2
5,55,125: Restoration spring, 16°26.56,12
6: Overhead line, 17, 27, 57° 127: Power collector boat, 19,
29,59,129: Push-up force increasing device, 160,260
Nijikens dialect.

Claims (1)

[Scope of Claims] 1. In a pantograph that collects current through sliding contact with the overhead wire, detection that detects that the collector boat and the overhead wire are out of line or approaching the disconnection due to a change in the contact force between the overhead wire and the current collector boat. A device and a push-up device that pushes up the collector boat when the detection device detects that the line is out of line or approaching the track-away are provided between the restoring spring on the pantograph frame and the collector boat, and the push-up device also pushes up the boat. A pantograph characterized in that it is provided with a timer mechanism that maintains the operation for a certain period of time and a push-up force increasing device that increases the push-up blade of the pantograph frame in conjunction with the push-up operation of the push-up device. 2. A pantograph as claimed in claim 1, wherein the uplift force increasing device comprises an actuator operated by pressure fluid. 3. The pantograph according to claim 2, wherein the pushing-up force increasing device increases the number of pushing-up blades of the pantograph frame in conjunction with the pushing-up operation of the pushing-up device via a sequence valve.