JP3421473B2 - Locking device for railroad crossing barrier - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a locking device for a railroad crossing breaker that brakes and holds the railing stop in an electric railroad crossing breaker in which an electric motor raises and lowers the rail. The present invention relates to a locking device for holding a blocking rod in a raised position by braking.

[0002]

2. Description of the Related Art Conventionally, as a breaker provided at a railroad crossing,
The train position is detected, the electric motor is driven and controlled based on the position detection signal to automatically raise and lower the shutoff rod, and the built-in electric brake of the electric motor is operated at the raised position and the lowered position to shut off the shutoff rod. There is an electric railroad crossing breaker having a structure in which a vehicle is braked and held at an ascending position and a descending position.

By the way, the power of the circuit breaker is temporarily cut off at the time of construction near the railroad crossing circuit breaker, maintenance / inspection of the circuit breaker, etc. The braking of is released, and the shutoff rod drops due to its own weight. In this case, the railroad crossing is closed and the passage of vehicles and the like is obstructed, which causes a major obstacle to traffic.

Therefore, conventionally, there is provided a locking device for mechanically braking and holding the shutoff rod in the raised position by manual operation when the power supply is stopped (for example, the actual fair 6-
16849, etc.). In such a conventional locking device, an operation lever is provided on the outside of the shutoff rod body, one end of the wire is connected to an eccentric shaft rotated by the operation lever, the other end of the wire is connected to a brake piece, and the operation lever is externally connected. By manually rotating the, the brake piece is brought into pressure contact with the brake wheel provided on the drive shaft of the motor through the wire, so that the blocking rod can be held in the raised position by braking. In addition, a micro switch linked to the operating lever is installed in series with the power supply line of the circuit breaker, and the micro switch is operated in conjunction with the turning operation of the operating lever to supply power to the circuit breaker when the manual brake is activated. Is automatically stopped.

[0005]

However, the conventional locking device has only two operating lever positions, the unlocking position and the locking position. That is, there are a position where the manual brake is not operated and the breaker power is turned on (unlocked position), and a position where the manual brake is operated and the breaker power is turned off (locked position).

There are the following problems only with such two positions. In the circuit breaker, it is necessary to appropriately adjust the descent time of the shutoff rod so that the descent time of the shutoff rod will not be too early or too late. Therefore, the descent time during a power failure of the shutoff rod is adjusted. This is a method of adjusting the position of the balance weight provided on the shutoff rod to adjust the natural fall time of the shutoff rod.

However, in the case of a circuit breaker equipped with a conventional locking device, the power is turned off when the manual brake is deactivated.
The N state is reached, the electric brake is in the operating state, and the power is turned on
When the electric brake is set to FF and the electric brake is turned off, the manual brake is activated. For this reason, when adjusting the descent time during a power outage, with the operating lever set to the unlocked position and the manual brake inactive, remove the motor and brake control circuit relay built into the circuit breaker. Or, it was necessary to forcibly turn off the power supply circuit. For this reason, it is necessary to remove the cover of the main body of the circuit breaker, which makes the work troublesome.

The present invention has been made in view of the above circumstances, and is a chain of circuit breakers in which a state where the manual brake is not operated and the power supply to the control circuit of the circuit breaker is stopped by an operation outside the circuit breaker can be set. An object is to provide a locking device.

[0009]

For this reason, the present invention provides a power supply for a control circuit provided with an electric motor for driving the shut-off rod to move up and down, and an electric brake for holding the shut-off rod at a raised position and a lowered position of the shut-off rod. Switch means for controlling power supply to the control circuit, which is interposed in series with the wire, and friction for braking the brake wheel by pressing a brake piece against the peripheral surface of the brake wheel fixed to the drive shaft of the shutoff rod of the electric motor. The brake means and the operation lever outside the main body of the circuit breaker are manually turned to operate the switch means and the friction brake means in an interlocking manner, and when the operation lever is pivotally fixed to the unlocked position, the switch means is placed in the circuit closing position. Operating means for operating the friction braking means to the non-operating position and operating the switching means to the circuit opening position and the friction braking means to the operating position when the operation lever is pivotally fixed to the locking position. In a lock device for a circuit breaker provided with the operating means, an intermediate position for operating the switch means to a circuit opening position and the friction brake means to a non-operating position in a rotation range between an unlock position and a lock position. Is provided, and the operation lever can be held at the intermediate position by the holding means.

The operating means is specifically the operating lever, a rotary shaft pivotally supported by the main body wall of the circuit breaker and provided with the operating lever at one end outside the main body wall of the circuit breaker, and the rotating shaft. An eccentric shaft provided on the other end side of the moving shaft and eccentric to the rotating shaft, a cam link whose one end is swingably supported, and one end connected to the other end side of the cam link and the other end. Is provided with a flexible string member connected to the brake piece of the friction brake device and the holding means, and when the operation lever is in the unlocked position, the eccentric shaft is the operation lever of the cam link and the switch means. It is set to a position in the separated state, the tension is not applied to the string member, and the brake piece of the friction brake device is elastically biased by the elastic member in the direction of separating from the brake wheel, and the operation lever is rotated to move to the intermediate position. Eccentric shaft is When the operating lever of the switch means is set to the position where the switch lever is opened to the position where the circuit of the switch means is opened and the operating lever is in the locking position, the eccentric shaft presses the cam link together with the operating lever of the switch means. It is preferable that the brake piece is set to the position and the brake piece of the friction brake device is pressed against the brake wheel via the cord member against the elastic biasing force of the elastic member via the cord member.

[0011]

According to this structure, the manual friction brake means can be deactivated and the switch means can set the circuit open state only by operating the operation lever from the outside of the main body of the circuit breaker. It will be possible to adjust the descent time during a power failure of the shutoff rod without removing the cover.

Further, by using the cam link, it is possible to stably obtain the intermediate position state in which the friction brake means is in the non-operating state and the switch means is in the circuit open state.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In FIGS. 3 and 4 showing the overall schematic configuration of the railroad crossing barrier of the present embodiment, the main body 1 of the barrier is fixed to the ground by columns 2. In the main body 1 of the circuit breaker, an electric motor 3 for driving the breaking rod 7 up and down is built. The rotational force of the electric motor 3 is transmitted to the shutoff rod rotating shaft 5 via the reduction gear mechanism 4 shown in FIG. The tip of the rotating shaft 5 is fixed to a blocking rod holder 6 shown in FIG. 4, and the blocking rod holder 6 has a blocking rod 7 on one side and a balance weight 9 on the other side via an arm 8.
Is installed. Incidentally, 12 and 13 are limit switches which are turned on and off by a cam 4A which rotates together with the rotary shaft 5, and detect the lowering and raising of the shutoff rod 7, respectively.

Further, the circuit breaker main body 1 has a built-in control circuit 10 shown in FIG. 5 for driving and controlling the electric motor 3 and the electric brake 14 to control the lifting and lowering operation of the blocking rod 7. The control circuit 10 shown in FIG. 5 will be described. FIG. 5 shows the state in which the cutoff rod 7 is in the raised position, the limit switch 13 is in the ON state, and the relay CR2 is excited from the rectifier circuit 15 via the limit switch 13 and the first contact CR1a of the relay CR1. The first contact point CR2a is in the ON state, and the electric connection to the electric brake 14 holds the breaking rod 7 in the raised position by braking. At this time, the second contacts CR2b of the relay CR2 are both in the off state, and the power supply to the electric motor 3 is stopped.

In this state, when the approach of the train is detected, the relay CR1 is in the non-excited state and its first contact C
R1a and the second contact CR1b are O from the ON position in the figure.
Switch to FF position. As a result, the relay CR2 is de-energized, the first contact CR2a thereof is switched from ON to OFF, the energization of the electric brake 14 is stopped, the braking holding force of the cutoff rod 7 is released, and at the same time, the second contact CR2b is turned ON. The electric motor 3 drives the cutoff rod 7 to descend. When the cutoff rod 7 is lowered to a predetermined position, the limit switch 12 is turned on by the cam 4A, and the relay CR2 is excited via the first contact CR1a which is switched to the OFF position. As a result, the first contact CR2a turns on and the second contact CR2a
b is turned off and the electric motor 3 is stopped, and at the same time, the electric brake 14 operates to hold the cutoff rod 7 in the lowered position by braking.

Further, such a railroad crossing barrier is shown in FIGS.
As shown in FIG. 5, the lock device has a locking device that can manually hold the blocking rod 7 by braking. The locking device comprises a friction brake device 20 as a friction braking device for braking the blocking rod 7, the friction and the operating device 30 of the brake device 20 as an operation means for operating, more friction brake device in operation of the operating device 30 20 And a micro switch 60 as a switch means for interlocking with and stopping the power supply to the control circuit 10.

The friction brake device 20 includes a brake wheel 21.
And a brake piece 22 that brakes the brake wheel 21 by pressing it against the peripheral surface of the brake wheel 21, and a brake piece mounting plate 23.
And a bracket 24 and a spring 25. The brake wheel 21 is fixed to the end of the drive shaft 3a protruding from the end wall of the electric motor body 3A. Brake piece mounting plate
23 is horizontally arranged at a position near the lower peripheral surface of the brake wheel 21, and one end thereof is swingably connected to an end wall of the electric motor main body 3A via a pin 26. The brake piece 22 is fixed to the brake piece attachment plate 23 by bolts at a substantially middle portion in the longitudinal direction.
The bracket 24 is arranged opposite to the other end of the brake piece mounting plate 23 with a gap therebetween and is fixed to the end wall of the electric motor body 3A, and the spring 25 is connected to the other end of the brake piece mounting plate 23. It is interposed between the bracket 24 and the bracket 24.

On the other hand, the operating device 30 includes a rotating shaft 31, an operating lever 32, an eccentric shaft 33 having an axis center eccentric to the shaft center of the rotating shaft 31, and a wire rope as a flexible cord member. 34, a cam shaft 35, a cam link 36 that rotates about the cam shaft 35, hooks 37A and 37B for locking the operation lever 32 in an unlocked position and a locked position, and an operation lever 32. And a lock plate 38 as a holding means for stopping and holding the.

The rotating shaft 31 passes through the boss portion 1A of the side wall of the breaker body 1 and is supported by a bearing 39. The operation lever 32 is fixed to a side surface of an end portion of the rotating shaft 31 that protrudes outward from the side wall of the breaker body 1. The eccentric shaft 33 is fixed to an end portion of the rotary shaft 31 protruding inward from the side wall of the breaker main body 1.
The cam shaft 35 is pivotally supported below the rotary shaft 31 on the side wall of the breaker body 1 via a bearing 40. The cam link 36 has the shape shown in FIG. 6, one end is fixed to the cam shaft 35, and the other end is provided with a pin 41 for connecting the wire rope 34. Also, cam link
The upper portion of 36 is formed in a stepped shape, and the first step portion 36a with which the peripheral surface of the rotating shaft 31 is in sliding contact, and the rotating shaft 31 that protrudes upward from a part of the upper surface of the first step portion 36a Accordingly, a second step portion 36b whose side surface is pressed by the peripheral surface of the eccentric shaft 33 is provided.

The wire rope 34 connects the cam link 36 and the other end of the brake piece mounting plate 23. In this case, a pin 42 with a screw is fixed to one end of the wire rope 34, the pin 42 is screwed into the brake piece mounting plate 23, and the nut 42 is
It is tightened and fixed by 43. A ring member 44 is fixed to the other end of the wire rope 34. The ring member 44 is rotatably fitted in the pin 41 of the cam link 36 and is prevented from coming off by a retaining ring 45. Further, the wire rope 34 is provided with an outer tube 46, and both ends of the outer tube 46 are fixed to a bracket 24 fixed to an end wall of the electric motor main body 3A and a pedestal 52 in the breaker main body 1, respectively. It is penetratingly supported by the mounting portion of the bracket 47.

The hooks 37A and 37B are fixed to the side wall of the breaker main body 1 by nuts 48, respectively, and the tips thereof are bent at a substantially right angle, and the engaging holes formed in the operating lever 32 at the bent portions.
32a is configured to engage. The lock plate 38 is composed of, for example, a leaf spring made of stainless steel, and is fixed to the end surface of the boss portion 1A on the side wall of the breaker body 1 with a screw 49. Further, the lock plate 38 has a protrusion 50 at the tip, and the operation lever 32
32A formed by welding a round bar to the side surface of the
Is configured to stop and hold the operating lever 32 at a position (over the intermediate position of the operating lever 32, which is a feature of the present invention) over the projection 50. Reference numeral 51 is a stopper that regulates the elastically deformed position of the lock plate 38.

The microswitch 60 is a normally closed type, and is interposed in the power supply line of the control circuit 10 as shown in FIG.
10 is closed to enable power supply and switch on (excitation)
At some time, the control circuit 10 is opened to stop the power supply. The micro switch 60 is attached to the base 52 via a bracket 53. Actuating lever 61 of micro switch 60
Extends in the direction perpendicular to the axial direction of the eccentric shaft 33, and
When the eccentric shaft 33 is rotated to a predetermined position in conjunction with the rotation operation of, the operating lever 61 is pushed to the circuit open position, the micro switch 60 is turned on (excited), and its contact is turned off.

Next, the operation of the locking device of this embodiment will be described with reference to FIG.
A description will be given with reference to (A) to (D). First, FIG.
In (A), the operation lever 32 is in the unlocked position, the micro switch 60 is off (non-excited), its contact is in the on state (circuit closed position), and power is supplied to the control circuit 10. The electric motor 3 and the electric brake 14 can be energized and the normal operating state of the circuit breaker is shown.

In this state, the eccentric shaft 33 is not in contact with the operating lever 61 of the micro switch 60. The cam link 36 is also in the normal position, the brake piece 22 is separated from the brake wheel 21, and the manual friction brake device 20 is inoperative. From this state, when the operation lever 32 is rotated from the unlocked position in the locking direction (counterclockwise direction in FIG. 2) by approximately 90 degrees, the eccentric shaft 33 is rotated together with the rotation shaft 31 and the eccentric shaft 33 is rotated as shown in FIG. As shown, the peripheral surface of the eccentric shaft 33 contacts the actuating lever 61 of the microswitch 60 and the side surface of the second step portion of the cam link 36, but the operating states of the microswitch 60 and the friction part device 20 are as shown in FIG. There is no change with the state.

Further, the operation lever 32 is provided with a protrusion 32 on its side surface.
When A moves over the protrusion 50 of the lock plate 38, that is, when it rotates to the intermediate position, the rotation of the eccentric shaft 33 causes the rotation of FIG.
As shown in (C), the operating lever 61 of the microswitch 60
Is pressed by the eccentric shaft 33, and the microswitch 60 is turned on (excited). As a result, the contacts of the microswitch 60 are opened and the power supply to the control circuit 10 is cut off. Further, the side surface of the second step portion 36b of the cam link 36 also has an eccentric shaft 33.
It is pushed by and is rotated clockwise about the cam shaft 35 in FIG. As a result, the center position of the pin 41 moves downward, the wire rope 34 is pulled against the elastic force of the spring 25, and the brake piece mounting plate 23 rotates, but at this operating lever position, the brake piece is still attached. 22 does not press against the peripheral surface of the brake wheel 21.

Therefore, in this intermediate position, the micro switch 60 is in the circuit open state, the power supply to the control circuit 10 is stopped, and the friction brake device 20 is in the inoperative state.
The blocking rod 7 is in a free state in which neither the braking force of the friction brake device 20 nor the braking force of the electric brake 14 acts. At this intermediate position, the protrusion on the operating lever 32 side
When 32A gets over the protrusion 50 of the lock plate 38, the lock plate 38
Elastically returns and the projection 32A is locked by the projection 50, and the operating lever 32 is stopped and held at the intermediate position.

Further, when the operating lever 32 is rotated to the locking position, the eccentric shaft 33 further pushes the operating lever 61 of the micro switch 60 and the side surface of the second step portion 36b of the cam link 36. As a result, while the micro switch 60 is maintained in the ON (excited) state as it is, the wire rope 34 is further pulled by the rotation operation of the cam link 36 and the brake piece 22 is braked by the rotation of the brake piece mounting plate 23. By making a pressure contact with the peripheral surface of the electric motor 3, a braking force acts on the rotating shaft 5 of the cutoff rod 7 via the drive shaft 3a of the electric motor 3 to hold the cutoff rod 7 by braking.

FIG. 7 shows the relationship between the turning angle of the operating lever 32 and the clearance between the brake piece 22 and the brake wheel 21.
Regarding the gap on the vertical axis, the + direction is the separation direction (there is a gap), −
The direction indicates the pressure contact direction (no gap). In the figure, the solid line shows the case of this embodiment in which three position positions of an unlocking position, an intermediate position and a locking position are provided as the operation lever position,
The broken line shows the case of the conventional example in which two position positions, an unlock position and a lock position, are provided. Area A shows the setting range of the intermediate position.

In the case of the device of this embodiment, the cam link 36 does not rotate until the rotation angle of the operating lever 32 reaches approximately 90 degrees, and there is no change in the gap between the brake piece 22 and the brake wheel 21. After that, the brake piece 22 comes close to the brake wheel 21. That is, by using the cam link 36, the rotation amount of the operation lever 32 with respect to the movement stroke amount of the brake piece 22 can be made substantially larger than before, the micro switch 60 is on (excitation), and It is easy to set the rotation region where the friction brake device 20 is in the non-operating state, and the intermediate position can be set stably.

In this way, as the operating position of the operating lever 32, an intermediate position is provided in addition to the unlocking position and the locking position, and the micro switch 60 is turned on (excited) by an operation outside the breaker, and its contact point is set. Is opened to shut off the power supply to the control circuit 10 and to set the state in which the friction brake device 20 in which the brake piece 22 does not come into contact with the circumferential surface of the brake wheel 21 is deactivated, so that the shutoff rod 7 is cut off. Even when adjusting the time descent time, it is not necessary to remove the main body cover of the circuit breaker, which facilitates the adjustment work.

In order to lock the operating lever 32 in the unlocked position or the locked position, lock it with a lock while the engaging holes 32a of the operating lever 32 are engaged with the hooks 37A and 37B. You can leave it.

[0032]

As described above, according to the present invention, the shut-off rod can be set to a free state from the outside without removing the cover of the shut-off device, which facilitates the adjustment work of the shut-down rod during a power failure. The workability of maintenance and inspection of the circuit breaker can be further improved.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of a lock device for a circuit breaker according to the present invention.

FIG. 2 is a front view of an operation lever portion of the above embodiment.

FIG. 3 is a front view of the circuit breaker of the above embodiment.

FIG. 4 is a schematic perspective view showing a drive mechanism of a blocking rod of the circuit breaker of the above embodiment.

FIG. 5 is a control circuit diagram of the above embodiment.

6A and 6B are operation explanatory diagrams of the above embodiment, FIG. 6A is a diagram showing a case where an operation lever is in an unlocked position, and FIG. 6B is a diagram showing a case where the operation lever is between an unlocked position and an intermediate position. Figure, (C) is a diagram showing when the operating lever is in the intermediate position, (D) is a diagram showing when the operating lever is in the locking position

FIG. 7 is a diagram showing a relationship between a clearance between a brake piece and a brake wheel and a rotation angle of an operation lever.

[Explanation of symbols]

1 Breaker body 3 electric motor 3a drive shaft 7 isolation rod 9 Balance weight 10 Control circuit 14 Electric brake 20 Friction braking device 21 brake wheels 22 brake shoe 30 Operating device 31 Rotation axis 32 Control lever 32A protrusion 33 Eccentric shaft 34 wire rope 35 cam shaft 36 cam link 38 Lock plate 50 protrusions 60 micro switch 61 Actuator lever

Claims (2)

(57) [Claims] 1. A control circuit provided in series with a power supply line of a control circuit, comprising: an electric motor for driving a breaking rod up and down and an electric brake for holding the breaking rod in a raised position and a lowered position of the breaking rod. Switch means for controlling power supply to the electric motor, friction brake means for braking the brake wheel by pressing a brake piece against the peripheral surface of the brake wheel fixed to the drive shaft of the cutoff rod of the electric motor, and operation outside the breaker body The lever is manually rotated to interlock the switch means and the friction brake means, and when the operation lever is pivotally fixed to the unlocked position, the switch means is operated to the circuit closed position and the friction brake means to the inoperative position. A locking device for a circuit breaker, comprising: operating means for operating the switch means to the circuit open position and the friction brake means to the operating position when the operation lever is pivotally fixed to the locking position. The said operating means, in a rotation range between the unlocking position and the locking position, an intermediate position is provided for operating the switching means of the circuit open position and the friction brake means in a non-actuated position, by holding means intermediate position A locking device for a breaker, which is configured to hold an operation lever. 2. The operating means comprises the operating lever, a rotary shaft pivotally supported by the wall of the breaker main body and provided with the operation lever at one end outside the main body of the breaker main body, and the other end of the rotary shaft. Side, which is eccentric to the rotation shaft, a cam link whose one end is swingably supported, one end connected to the other end of the cam link, and the other end is the friction brake device. When the operating lever is in the unlocked position, the eccentric shaft is in a position in a state of being separated from the operating lever of the cam link and the switch means. When the tension is not applied to the string member, the brake piece of the friction brake device is elastically biased by the elastic member in the direction away from the brake wheel, and when the operation lever is rotated to the intermediate position, The eccentric shaft is made by the switch means. The lever is set to a position where it is pushed to a position where the circuit of the switch means is opened, and when the operation lever is in the locking position, the eccentric shaft is set to a position where it presses the cam link together with the operating lever of the switch means. The lock of the breaker according to claim 1, wherein the brake piece of the friction brake device is pressed against the brake wheel against the elastic biasing force of the elastic member through the cord member by the rotation operation of the cam link. apparatus.