JP3207946B2 - Pointing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a switching device, and more particularly to an indexing device in which one movable rail at a point portion is forcibly opened and another movable rail is forcibly closed by an erroneous train running. The present invention relates to a switching device that does not fail even when "" occurs.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 4, a tongue rail (pointed rail) 103 is provided at a point portion 101 where a train T is shifted from one track to another track to change the course.
A point device 105 is provided for moving points a and 103b to change points. This conventional point device 1
05 is provided with a drive mechanism 109 for driving an operation canister 107 connected to the tongue rails 103a and 103b. The drive mechanism 109 includes a motor 109a and a reduction gear unit 109b combining a plurality of gears and clutches.
And so on. By reciprocating the operation can 107 by the driving device 109, the tongue rails 103a and 103b are moved in the direction of the arrow A as shown by a two-dot chain line to change points.

[0003]

However, the conventional switching device 105 has the following problems. That is, as shown by a solid line in FIG. 4, for example, although the tongue rail 103a is pressed (closed) against the basic rail 111a, the train T erroneously travels in the direction of arrow B, and the tongue rail 103a When the so-called "indexing" is forcibly opened and passed, the operating rod 107 is pushed with a large force in the direction of arrow A, and the motor 109a of the driving mechanism 109 and the reduction gear device 109b are destroyed. was there.

In addition, many gears and clutches are used in the drive mechanism 109, and the mechanism is very complicated. It takes a long time. The present invention has been made in order to solve the above-mentioned problem, and an object of the present invention is to provide a switching device that does not fail even by “indexing”.

[0005]

According to a first aspect of the present invention, there is provided a switching device for moving a movable rail for switching points, wherein a fluid cylinder is used as a drive mechanism of the switching device. with use, provided in a first fluid passage leading to the cylinder chamber of the fluid cylinder, the fluid
The communication between the pressure source and the cylinder chamber
A communication state in which the position of the piston is movable, and the fluid pressure source
A first pressure control means capable of switching between a closed state in which the position of the piston of the cylinder is fixed by shutting off the cylinder chamber and a second fluid passage communicating with the cylinder chamber of the fluid cylinder; And the first pressure control means is
In the shut-off state, the piston moves and the cylinder chamber
If the internal pressure rises, the pressure will act
This forcibly shuts off the first pressure control means.
Automatically opening at a lower fluid pressure than the fluid pressure to release the
And a second pressure control means capable of reducing the pressure in the cylinder chamber .

[0006]

According to the first aspect of the present invention, there is provided a switching device using a fluid cylinder as a drive mechanism, and a first pressure control means in a first fluid passage communicating with a cylinder chamber of the fluid cylinder. The first pressure control means is provided for communicating between the fluid pressure source and the cylinder chamber.
And the fluid pressure
Isolate between the source and the cylinder chamber to fix the position of the cylinder piston. Therefore, the movement of the movable rail for point change is fixed at the change position.

A second pressure control means is provided in a second fluid passage communicating with the cylinder chamber of the fluid cylinder, and the second pressure control means is configured such that the first pressure control means is in a shut-off state. Moves the piston in the cylinder chamber
If the pressure rises, the pressure
Thus, the valve is automatically opened by a fluid pressure lower than the fluid pressure for forcibly releasing the shut-off state of the first pressure control means.
Reduce the pressure in the cylinder chamber . Therefore, although the position of the piston is fixed as described above and the movable rail is pressed against the basic rail and closed, the train runs erroneously and forcibly opens and passes through the movable rail. If this occurs, the device of the present invention operates as follows.

[0008] That is, by the "indexing", the piston of the cylinder connected to the movable rail is pushed by a large force to increase the fluid pressure, but the increase in the pressure releases the first pressure control means. Before the second pressure control means opens, the piston moves. Therefore, the fluid pressure does not rise abnormally and the first pressure control means and the hydraulic circuit are not broken, and the movable rail and the piston are not deformed or broken by applying a large force.

In other words, the point device of the present invention does not fail even by the above-mentioned "indexing".

[0010]

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIG. 1, a switching device 1 according to an embodiment of the present invention includes an operating can 5 connected to tong rails 3a and 3b, a hydraulic cylinder 7 for driving the operating can 5, and a hydraulic pressure for operating the hydraulic cylinder 7. The circuit 9 is provided.

Here, the operation can 5 is a basic rail 4
a and a bar-shaped member passed under the tong rails 3a and 3b so as to intersect substantially vertically.
The connection portions 3c and 3d near the distal ends of the a and 3b are connected, and the inner end 5a is connected to the piston rod 7d of the hydraulic cylinder 7. As shown by the dashed line, the tongue rails 3a, 3b and the basic rails 4a, 4b are locked at the portions where the operation can 5 intersects with the tongue rails 3a, 3b and the basic rails 4a, 4b. Locking devices 8a and 8b for fixing are provided.

The hydraulic cylinder 7 has left and right cylinder chambers separated by a piston, and drives the operation can 5 in the direction of the arrow A or B by the pressure fluid supplied from the hydraulic circuit 9. The hydraulic circuit 9 includes a driving oil tank 1 described later.
1, a motor 13, a pump 15, and various control valves (see FIG. 2).
It is housed in the vicinity of the sleeper 16 (having a size of about 06 mm × width 399 mm × height 278 mm).

Here, the hydraulic circuit 9 will be described in detail with reference to FIG. The hydraulic circuit 9 includes a driving oil tank 11, a motor 13 for sending out driving oil, and a pump 15,
Driving oil is pumped from the outlets 17a, 17b toward the cylinder chambers 7a, 7b of the hydraulic cylinder 7.

Electromagnetic directional control valves 19a and 19b are provided between the fluid passages connecting the outlets 17a and 17b and the cylinder chambers 7a and 7b, respectively, and the operating direction of the hydraulic cylinder 7 is determined by controlling the opening and closing of these valves. As well as
By closing both electromagnetic directional control valves 19a and 19b, the cylinder chambers 7a and 7b are closed, and the position of the piston 7c is fixed.

Check valves 21a and 21b are provided in the middle of the fluid passage connecting the electromagnetic direction control valves 19a and 19b and the outlets 17a and 17b. The check valves 21a and 21b are opened in the directions of arrows C and D, respectively, when the delivery pressure of the pump 15 exceeds a specified value (250 kgf in the present embodiment).
Reflux the drive oil to 1. Therefore, the hydraulic pressure applied to the hydraulic cylinder 7 is maintained at a certain value or less, and an excessive load is not applied to the hydraulic cylinder 7.

Relief valves 23a and 23b are connected to the cylinder chambers 7a and 7b via fluid passages. The relief valve 23 opens when the oil pressure becomes equal to or higher than the set pressure to return the drive oil to the drive oil tank 11, and the set pressure is higher than the set pressure at which the check valve 21 is opened. Further, the pressure is set to a value (400 kgf in the present embodiment) lower than the pressure (about 1000 kgf) at which the closed electromagnetic directional control valves 19a and 19b are forcibly opened.

A manual pump 27 is connected to the hydraulic circuit 9 via a check valve 25.
3. When the pump 15 cannot be used, the driving oil can be pumped to the hydraulic cylinder 7 by the manual pump 27 instead. Next, the operation of the switching device 1 according to the present embodiment will be described.

First, before the point change, the electromagnetic direction control valves 19a and 19b of the hydraulic circuit 9 (see FIG. 2) are closed, the position of the piston 7c is fixed, and the tongue rails 3a and 3b are moved to the positions shown in FIG. It is held at the position shown by the solid line. Next, as shown in FIG. 1, when the operation rod 5 is driven in the direction of arrow A to move the tong rails 3a, 3b to the position shown by the two-dot chain line (that is, the points are changed), first, the hydraulic circuit 9 Is turned on and the motor 13 is operated,
The pump 15 is rotated to start driving oil pumping. At the same time, power is also supplied to the electromagnetic directional control valves 19a and 19b, and as shown in FIG.
a in the direction of arrow E, and the electromagnetic directional control valve 19b
Is opened in the direction of arrow F. Then, the driving oil passes through the electromagnetic direction control valve 19a and is sent to the cylinder chamber 7a under pressure, and the piston 7c is driven in the direction of arrow A. Therefore, as shown in FIG. 1, the operating rod is pushed in the direction of arrow A, and the tong rail 3
a and 3b move.

As shown by the two-dot chain line, when the tongue rail 3b is pressed against the basic rail 4b and closed to complete the change of the point, the completion of the change is detected by a sensor (not shown). , The two electromagnetic directional control valves 19a and 19b are completely closed. As a result, the position of the piston 7c of the hydraulic cylinder 7 is fixed, and the tong rails 3a, 3b are held.

Next, as shown in FIG. 1, when the operation rod 5 is driven in the direction of arrow B to move the tong rails 3a, 3b from the position indicated by the two-dot chain line to the position indicated by the solid line, Conversely, if the electromagnetic direction control valves 19a and 19b of the hydraulic circuit 9 (see FIG. 2) are opened in the directions of arrows G and H, respectively,
Driving oil passes through the electromagnetic directional control valve 19b from the delivery port 17b and is pressure-fed to the cylinder chamber 7b.
, The tongue rails 3a and 3b move. After the completion of the point change, the electromagnetic direction control valves 19a and 19b are closed, the position of the piston 7c is fixed, and the tong rails 3a and 3b are held as in the above-described case.

If a foreign object such as a tool or a stone is caught between the tongue rail 3b and the basic rail 4b during the above-mentioned point changing operation, the movement of the piston 7c is stopped and the driving by the pump 15 is performed. The oil pressure applied to the hydraulic cylinder 7 rises because the oil pressure feed continues,
When the oil pressure exceeds the set value (250 kgf), the check valve 21b opens, so that the drive oil is returned to the drive oil tank 11 and the oil pressure applied to the hydraulic cylinder 7 is kept below this set value. Therefore, no excessive hydraulic pressure is applied to the hydraulic cylinder 7, and no excessive force is applied to the tongue rail 3b, the basic rail 4b, the operating rod 5, and the like.

Then, as shown in FIG. 3, for example, the change of points is completed, and the tongue rail 3b becomes the basic rail 4b.
Despite being pressed and closed, the train T
Accidentally travels in the direction of arrow J and forcibly opens and passes the tong rail 3b, so-called "indexing", the switch device 1 of the present embodiment operates as follows. That is, when "indexing" occurs, the operation can 5 and the piston 7c are pushed with a large force in the direction of arrow B. However, since the electromagnetic direction control valves 19a and 19b of the hydraulic circuit 9 (see FIG. 2) are closed, the cylinder The oil pressure in the chamber 7a rises rapidly. However, when the oil pressure reaches the set pressure (400 kgf) of the relief valve 23a, the relief valve 23a
Is opened, the drive oil is returned to the drive oil tank 11, and the piston 7c moves in the direction of arrow B. Therefore, the tongue rail 3b, the basic rail 4b, the operating can 5 and the like are not deformed or broken by an excessive force, and the hydraulic cylinder 7 and the hydraulic circuit 9 are not broken by an abnormal rise in the hydraulic pressure. . That is, even if the above-mentioned "indexing" occurs, the point device 1 does not break down.

As described above, the switching device 1 of the present embodiment
Is advantageous in that even if the above-mentioned "indexing" occurs due to a driver's oversight of a signal, a brake failure of a vehicle, or the like, no failure occurs. Further, the switching device 1 of the present embodiment has the following advantages due to the above-described configuration.

Since almost no gears or clutches are used in the drive mechanism, failures due to wear of parts and the like are small, and the number of maintenance inspections is extremely reduced. The structure is simple and can be manufactured at low cost. It is very light, weighing 60 kg, and can be carried by one person (the current point device has a weight of 350 kg).

Since it is small and occupies a small area, it can be used even in a line section where railway land is narrow. The conversion time is fast. The switching time of the switching device 1 of this embodiment is about 2.3 seconds, while the switching time of the current switching device is about 5.5 seconds.

The conversion power is strong. The conversion force of the switching device 1 of the present embodiment can be adjusted up to 400 kgf, while the conversion force of the current switching device is about 150 kgf. By using a suitable driving oil (oil for aircraft, etc.), it can be used in a wide temperature range of -40C to 80C.

[0027] Even if the conversion cannot be performed, the recovery is quick because of the simple structure. Although the embodiment has been described above, the present invention is not limited to the above embodiment, and can be implemented in various modes.

[0028]

As described above, according to the switching device of the present invention, even if "indexing" occurs due to a driver's oversight of a signal or a brake failure of a vehicle, a remarkable effect is obtained. To play.

In addition, the switching device of the present invention employs a fluid cylinder as a drive mechanism, and uses almost no parts such as gears and clutches. Therefore, there is a remarkable effect that the structure is simple, small and inexpensive to manufacture, and there are few failures and almost no maintenance is required.

[Brief description of the drawings]

FIG. 1 is a plan view of a point device of the present embodiment.

FIG. 2 is a block diagram illustrating a configuration of a hydraulic circuit according to the present embodiment.

FIG. 3 is an explanatory diagram showing an operation at the time of “indexing”.

FIG. 4 is an explanatory diagram showing a conventional technique.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Pointing device 3a, 3b ... Tongue rail 7 ... Hydraulic cylinder 7a, 7b ... Cylinder chamber 7c ... Piston 9 ... Hydraulic circuit 19a, 19b ... Electromagnetic direction control valve 23a, 23b ... Relief valve

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B61L 5/04 E01B 7/20

Claims (1)

(57) [Claims] 1. A switching device for moving a movable rail for switching points, wherein a fluid cylinder is used as a drive mechanism of the switching device and provided in a first fluid passage communicating with a cylinder chamber of the fluid cylinder. Between the fluid pressure source and the cylinder chamber.
A communication state in which the position of the piston of the cylinder is movable.
When the switching and blocking state by blocking between said cylinder chamber and the fluid pressure source to fix the position of the piston of the cylinder
Replaceable first pressure control means, provided in a second fluid passage communicating with a cylinder chamber of the fluid cylinder, wherein the first pressure control means is in the shut-off state.
The piston moves to increase the pressure in the cylinder chamber
In this case, when the pressure acts , the valve is automatically opened at a fluid pressure lower than the fluid pressure for forcibly releasing the shut-off state of the first pressure control means, and
And a second pressure control means capable of lowering the pressure in the dam chamber .