JPS5919657Y2 - Shutoff rod breakage prevention device - Google Patents

Description

[Detailed description of the invention] This invention is based on the invention that when a vehicle blocked at a level crossing is escaping from a level crossing when a level crossing barrier is cut off, the barrier rod rotates horizontally against elastic force under the external force caused by the progress of the vehicle. In a level crossing barrier equipped with a barrier breakage prevention device (hereinafter referred to as a barrier) that prevents the barrier from breaking due to movement, the barrier is slowed down after a vehicle has passed, so that the barrier will not touch the human body when it is restored. This invention relates to a device for preventing breakage of a shielding rod, which has a structure that is safe even when touched.

At level crossings equipped with barrier gates, vehicles may be left stranded on the level crossing with the gates closed due to attempts to force their way through the crossing when the gates are lowered, or due to unexpected trouble or traffic jams while crossing the crossing. A lot of things happen.

At this time, the vehicle is forced to escape from the level crossing, but since the barrier remains closed, collision with another vehicle is unavoidable.

For this reason, the barrier generally has a barrier that, when receiving the external force in the horizontal direction from the vehicle during escape, rotates horizontally while remaining in contact with the vehicle against the elastic force to prevent the barrier from breaking. Built-in prevention device.

A conventional shutoff rod breakage prevention device will be explained based on FIG.

The device consists of a main body 1 at the left end in the figure that is held in a breaking rod lifting part of a circuit breaker (not shown), and a support shaft 2 at the other end of the main body 1.
1, and a cutoff rod holder 2 that fits and holds the cutoff rod 4, and an outer tube 11 on the main body 1 side.
A shutoff rod restoring device is contained within.

The restoring device includes a compression spring 13 interposed between a spring stopper 12 fitted and fixed to the right end of the outer tube 11 in the figure, and a spring washer 14 fixed to one end of the rod 15. The other end of the lever 15 is rotatably supported by the end of the lever 16 which is pivotally attached to the support shaft 21.

Next, the operation of the shield rod breakage prevention device having the above structure will be explained.

Normally, the rod 15 pulls the lever 16 by the spring force of the compression spring 13, so that the device main body 1 and the cutoff rod holder 2 are maintained in a straight line.

Next, as described above, when a vehicle trying to escape from the level crossing touches the barrier rod 4 and applies an external force F in the horizontal direction, the external force F acts as a moment force around the support shaft 21,
The moment force overcomes the spring force of the compression spring 13 and causes the blocking rod 4 to rotate together with the holder 2 around the support shaft 21 clockwise in the figure.

At the same time, the lever 16 pivoted on the support shaft 21 also rotates clockwise in the figure, pulling the rod 15 to the right and compressing the compression spring 13 via the spring washer 14.

When the vehicle passes and separates from the blocking rod 4, the external force F is removed, and the restoring force of the compression spring 13 pulls the rod 15 to the left in the figure, causing the lever 16 to rotate counterclockwise together with the support shaft 21, thereby closing the blocking rod 4. is returned to its previous position, that is, to a position that is in line with the main body 1 of the apparatus.

However, although the conventional overhanging device can sufficiently perform the function of preventing the breakage of the cut-off rod, when the cut-off rod is restored, the compressed spring that has accumulated pressure acts suddenly, so the force of the return of the cut-off rod is reduced. It was extremely dangerous if it hit too much and hit passersby.

For this reason, there is a device that is provided with a hydraulic shock absorber to buffer the restoring force of the cutoff rod (Japanese Utility Model Publication No. 33765/1983).

This structure transmits the horizontal movement of the cutoff rod to the piston of the shock absorber via a link mechanism, and when the cutoff rod is restored, it increases the fluid resistance against the movement of the piston, slowing down the restoring movement of the cutoff rod. ing.

However, in this case, the rotational movement of the shutoff rod is converted into linear motion of the piston by the link mechanism, so when the shutoff rod is restored (when the rotation angle of the shutoff rod changes from large to small), the piston movement speed is It tends to slow down gradually, and the fluid pressure drag becomes gradually smaller.

Therefore, the restoration speed of the shutoff rod gradually increases, and although it is gradually attenuated, it oscillates near the return position of the shutoff rod and does not come to rest easily, resulting in extremely unstable operation.

Furthermore, since the shock absorber is built into the isolation rod breakage prevention device, replacement work or maintenance/inspection work when the shock absorber breaks down is troublesome.

Therefore, it is an object of the present invention to eliminate the above-mentioned dangers of the conventional shock absorber and to improve the operational stability and replacement workability of the shock absorber.

For this reason, the present inventor uses a gear transmission mechanism to transmit the rotational movement of the cutoff rod to the piston of the shock absorber, and
The above object was achieved by providing a fluid pressure shock absorber outside the conventional apparatus main body so that it could be easily attached and detached.

The present invention will be explained below based on the drawings.

The present invention is constructed by adding a hydraulic shock absorber 3 to the conventional device as shown in FIG.

Therefore, in the apparatus according to the present invention, the same components as those in the prior art will be described using the same reference numerals.

In the figure, 1a indicates a connection part for connecting the hydraulic shock absorber 3, which is fixed and suspended on the apparatus main body 1 side.

A hydraulic shock absorber 3 is connected to the connecting portion 1a so that it can be easily attached and detached using a tightening tool.

Next, the structure and operation of the hydraulic shock absorber 3 will be explained with reference to FIG.

The hydraulic shock absorber 3 includes a cylinder case 31, a piston 32 that slides inside the case 31, a valve device that is slidably fitted into the left end of the piston 32 in the figure, and a rack formed on the side surface of the piston 32. 32 Pinion 34 fitted to C
It is mainly composed of b.

The cylinder case 31 is formed by sealing both ends of the cylinder, and after filling the inside of the case 31 with hydraulic oil through an oil filler port 31a, the cylinder case 31 is sealed with a screw plug 31b.

A connecting portion 35 having a screw hole 35 a for connecting to the device body 1 is formed at the center of the outside of the case 31 .

The operating shaft 34 is connected to the support shaft 21 of the cutoff rod 4 so as to rotate integrally therewith, and a pinion 34b is mounted thereon.

The axle box 36 of the operating shaft 34 is integrally connected and fixed to the cylinder case 31.

Inside the piston 32, there is a communication passage 32a that communicates two chambers A and B, which are divided into two by the piston 32.
is formed.

An oil supply hole 32b for lubricating the sliding movement of the piston 32 is formed in the center of the communication path 32a.

The valve device consists of a cap-shaped valve body 33 as shown, and a stopper 32e that projects into the communication passage 32a to restrict the leftward movement of the valve body in the figure.

The valve body 33 has an orifice hole 33 that communicates with both sides of the valve body 33.
Release hole 3 provided in the sliding part between a and communication path 32 a
3b and 3b, and a flange portion 33C that locks onto the valve seat 32d in order to restrict the rightward movement of the valve body 33 in the figure.

The orifice hole 33a is always open, but the relief hole 33b has a valve body 33 moving to the left in the figure and a stopper 32.
e, the valve body 33 moves to the right and closes to the valve seat 3.
2d, it is formed at a position where it is blocked by the inner wall of the communication path 32a.

Next, the operation of the isolation rod breakage prevention device according to the present invention in which the hydraulic shock absorber 3 is connected will be explained.

When the connecting portion 35 of the shock absorber 3 is connected to the connecting portion 1a of the device main body 1 as shown in FIG. It is connected by fitting into the formed groove-shaped female fitting part 21a.

- In this configuration, when a vehicle trying to escape from the level crossing touches the barrier rod 4 and an external force F is applied in the horizontal direction, the external force F acts as a moment force around the support shaft 21,
As the support shaft 21 rotates clockwise in FIG.
The actuating shaft 34 and pinion 34b connected to 1 also rotate clockwise in FIG.

Therefore, due to the engagement between the pinion 34b and the rack 32C, the piston 32 moves to the right in the figure, and the oil in the chamber A flows into the communication path 3.
2a into chamber B.

At this time, the valve body 33 in the valve device is moved to the left by the action of the fluid oil and is locked against the stopper 32e, so that the oil flows through both the orifice hole 32a and the relief hole 33b, so that the piston 32 moves, that is, the operating shaft 34. The rotation is accompanied by only slight fluid resistance.

Therefore, as in the conventional case, the shielding rod 4 can easily horizontally turn and be expanded by receiving an external force from the vehicle, thereby achieving the function of preventing breakage of the shielding rod.

Next, when the vehicle passes and leaves the blocking rod 4, the external force F is removed and the compression energy stored in the compression spring 13 acts as a restoring force on the support shaft 21, causing the first
Give a counterclockwise moment force in the figure.

The moment force rotates the pinion counterclockwise in FIG. 3 via the actuating shaft 34, causing the piston 32 to move to the left in the diagram.

However, in this case, at the same time as the piston 32 moves to the left, the valve body 33 moves to the right due to the flowing oil, and the flange 33C moves to the valve seat 32.
Since it touches d, the relief hole is 33, and b is the communication path 32.
A is closed by the orifice hole 33, and the oil in the B chamber is
It flows into the room A through only the communication path 32a.

Therefore, such oil flow is accompanied by a considerable amount of fluid resistance, and the piston 32 slowly moves leftward, and the operating shaft 34 also slowly rotates.

Therefore, the blocking rod 4 is operated via the operating shaft 34 and the support shaft 21,
It rotates horizontally at a speed that is safe enough to pose no danger to passersby and returns to its previous position, that is, a position in a straight line with the main body 1 of the device.

At this time, since the rotational movement of the cutoff rod 4 is transmitted to the piston 32 by the gear transmission mechanism, the cutoff rod 4 does not swing near the old position of the cutoff rod, unlike when using a conventional link mechanism. The return operation of the cutoff rod 4 can be made extremely stable.

In addition, since the shock absorber 3 is manufactured separately and can be attached and detached from the main body of the device using only bolts, maintenance and inspection work or replacement work when the hydraulic shock absorber breaks down can be easily performed.
It is also possible to remove the shock absorbers from barrier crossings used at railroad crossings where there is very little foot traffic, eliminating the need for shock absorbers, and replace them with barrier barriers at railroad crossings with heavy foot traffic. It is economically advantageous because it can be done.

Although this embodiment shows a case where a hydraulic shock absorber is used as the fluid pressure shock absorber, a shock absorber using water or the like as the working fluid may also be installed.

As described above, according to the present invention, by using a gear transmission mechanism to convert the rotational movement of the shutoff rod into the linear motion of the piston of the shock absorber, the moving speed of the piston when the shutoff rod returns becomes almost equal. The stability of the slow speed operation of the shock absorber when the shutoff rod is restored is improved, and the phenomenon of swinging of the shutoff rod past the return position of the shutoff rod can also be eliminated.

In addition, it is extremely easy to attach and detach the shock absorber from the main body of the device, greatly improving work efficiency during maintenance, inspection, and replacement, and it is also economically advantageous because it can be attached to other circuit breakers. .

[Brief explanation of the drawing]

FIG. 1 is a plan sectional view showing a conventional shutoff rod breakage prevention device, and FIG. 2 is a front view showing a shutoff rod breakage prevention device according to the present invention.
FIG. 3 is a front sectional view and a side sectional view showing the internal structure of the hydraulic shock absorber in the device according to the present invention. DESCRIPTION OF SYMBOLS 1... Device main body, 2... Shutoff rod holder, 3... Hydraulic shock absorber, 4... Shutoff rod.

Claims (2)

[Scope of utility model registration request] (1) In an isolation rod breakage prevention device configured such that the isolation rod rotates horizontally against elastic force when receiving a horizontal external force,
An operating shaft connected to the support shaft of the isolation rod and rotating integrally, a rack portion that divides the inside of a cylinder case containing working fluid into two chambers and meshes with a gear fixed to the operating shaft, and a rack section that connects the compartments. a piston that has a communication passage connecting the piston and reciprocates within the cylinder case due to rotation of an operating shaft; and a valve device that is interposed in the communication passage and increases fluid pressure resistance when the piston moves in response to restoring the horizontal movement of the isolation rod. A device for preventing breakage of a cutoff rod, characterized in that a fluid pressure shock absorber comprising: is configured to be freely attachable and detachable on the outside of the main body of the device for preventing breakage of a cutoff rod, thereby slowing down the restoring operation of the cutoff rod. (2) A device for preventing breakage of a cutoff rod according to claim 1, wherein the fluid pressure shock absorber is a hydraulic shock absorber.