JP5837352B2 - Breaker - Google Patents

Description

  The present invention relates to an electric railroad crossing breaker for railways, and further relates to a breaker control device for an electric breaker used for gates such as a parking lot and a toll collection point on a toll road, and an electric breaker.

  Conventionally, this type of electric circuit breaker has been provided with a weight so as to balance the shut-off can so that the shut-off can slowly descend by its own weight. However, this electric circuit breaker with a weight has a problem that it takes time to adjust the descending characteristics by the weight, and it is necessary to provide a snow cover on the weight part in a snowy country. Therefore, a so-called waitress type electric circuit breaker in which no weight is provided has been proposed.

  However, in the case of a waitress, since the load torque on the shut-off side is large, the own-weight drop speed tends to become extremely large. That is, the barrier can slowly descend at the beginning of the descent, but the speed increases as it descends, which is dangerous for passers-by and vehicles, and has a large impact force when stopped at the lowered position. This will adversely affect the mechanical part of the breaker body.

  As means for solving such problems, Patent Document 1 discloses that when a power failure or failure is detected, the electric circuit breaker is disconnected from the driving power source, and when the breaker reaches the set position by its own weight drop, Discloses a technique for applying dynamic braking to a motor of a circuit breaker.

  However, various types of barriers with different lengths and weights are used depending on the width of the railroad crossing and the amount of traffic. The load torque for the motor of the breaker can vary greatly depending on the length and weight of the breaker. The technique described in Patent Document 1 does not take into account the variation in load torque due to the difference in the length and weight of such a shield.

  In view of this, a technique has been proposed that includes a self-weight drop adjusting mechanism and a cam, and adjusts the self-weight drop speed and the self-weight drop time in consideration of load torque fluctuations due to differences in the length and weight of the shut-off can. This self-weight drop adjustment mechanism is equipped with an adjustment bolt, the position of the adjustment bolt is replaced with a tool, and three levels of "heavy", "medium" and "light" are selected according to the length and weight of the shut-off can. To change the load torque. Then, after determining the position of the adjustment bolt, the position of the power generation braking is adjusted by adjusting the configuration position of the cam switch driven by the cam, and the dead weight drop time is adjusted.

  However, for replacing the adjustment bolt. In addition to the need for a dedicated tool, there is a problem that the adjustment work requires proficiency.

Japanese Patent Laid-Open No. 11-291911

  SUMMARY OF THE INVENTION An object of the present invention is to provide a breaker control device capable of lowering the weight of the breaker at a safe speed regardless of the magnitude of the torque at the time of falling due to the difference in length and weight of the breaker and a breaker using the same. It is to be.

  Another object of the present invention is to provide a breaker control device capable of easily and surely adjusting its own weight lowering speed without using a tool and requiring skill, and a breaker using the same. Is to provide.

In order to solve the above-described problems, a breaker control device according to the present invention includes a motor for driving a breaker, a plurality of resistors having different resistance values, and a dynamic braking control circuit including a switch for selecting a contact point of the resistor. When the power supply to the motor is stopped, switch the switch and select the contact of the resistor to be connected, or set it to the neutral position away from the contact, and the weight drop of the shut-off rod with respect to the motor A plurality of stages of power generation braking divided according to the magnitude of the hourly torque are provided .

  As already pointed out, the length and weight of the breaker used in the breaker varies depending on the width of the railroad crossing, the amount of traffic, etc. The size of also changes. In view of the above, when the power supply to the motor that drives the circuit breaker is stopped, the circuit breaker control device according to the present invention responds to the magnitude of the torque when the weight of the circuit breaker that the circuit breaker has with the selected resistor. Multi-stage power braking is provided.

  That is, in consideration of the magnitude of the torque at the time of its own weight descent determined by the length and weight of the used shut-off can, the shut-off can, for example, “weight” shut-off can, “medium” shut-off can, “light” shut-off can When the power supply to the motor is stopped, a plurality of stages of dynamic braking according to the classification are given by the selected resistor. Accordingly, the weight of the barrier can be lowered at a safe speed regardless of the magnitude of the torque at the time of weight reduction due to the difference in length and weight of the barrier.

The motor is a three-phase motor, and the dynamic braking control circuit selects a single phase or two phases of the motor, and gives the dynamic braking divided according to the magnitude of the torque at the time of falling of the weight of the interrupter. Is preferred .

  Specifically, the dynamic braking control circuit includes a resistance selection circuit. The resistance selection circuit can include a plurality of resistors and a switch. Each of the plurality of resistors has a different resistance value. The switch selects at least one resistor from among the plurality of resistors by switching operation, and applies dynamic braking according to the resistance value of the selected resistor to the motor.

  Therefore, regardless of the magnitude of the torque at the time of weight drop due to the difference in length or weight of the breaker, the breaker control device capable of dropping the breaker at a safe speed with a simple method of operating the switch and its use. Could provide a breaker.

  Further, since the weight drop of the breaker is controlled by a method of selecting a resistor in the dynamic braking control circuit, a dedicated tool is not required and the skill level of the worker is not required.

It includes a cam switch that controls the start and stop timings of dynamic braking by setting the cam operating angle with respect to the switch in conjunction with the rotation of the rotary shaft, and setting the operating angle to 0 degrees It is preferable to set dynamic braking in accordance with the magnitude of the torque at the time of falling of the own weight .

As described above, according to the present invention, the following effects can be obtained.
(A) To provide a breaker control device capable of lowering the weight of the breaker at a safe speed regardless of the magnitude of the torque at the time of falling due to the difference in length and weight of the breaker and a breaker using the same. it can.
(B) It is possible to provide a breaker control device and a breaker using the same, which can easily and surely adjust the weight drop speed without using a tool and without requiring a proficiency level. .

It is a block diagram which shows the electric structure of the interruption | blocking can control apparatus which concerns on this invention. It is a figure explaining the power generation braking operation | movement of the circuit breaker using the circuit breaker control apparatus of FIG. It is a figure explaining another power generation braking operation | movement of the circuit breaker using the circuit breaker control apparatus of FIG. It is a figure explaining another power generation braking operation | movement of the circuit breaker using the circuit breaker control apparatus of FIG. It is a figure explaining another power generation braking operation | movement of the circuit breaker using the circuit breaker control apparatus shown in FIG. It is a figure explaining another power generation braking operation | movement of the circuit breaker using the circuit breaker control apparatus shown in FIG. It is a figure explaining the raising operation | movement of the circuit breaker using the circuit breaker control apparatus shown in FIG.

  Referring to FIG. 1, the shut-off control device includes a motor 1 and a dynamic braking control circuit 3. The motor 1 drives a shut-off can and is shown in this embodiment as a three-phase AC motor having Um-phase, Vm-phase and Wm-phase field coils. In addition, a motor of a type known in the circuit breaker, for example, a rotor having a permanent magnet can be used. Although not shown, the rotary shaft of the motor 1 is connected to the rotary shaft of the motor 1 through a rotation adjusting mechanism (generally a reduction gear train) or the like.

  The dynamic braking control circuit 3 includes a first resistance selection circuit 31, a second resistance selection circuit 32, and a third resistance selection circuit 33. Each of the first resistance selection circuit 31 to the third resistance selection circuit 33 includes a plurality of resistors (311, 312), (321, 322), (331, 332) and a switch Suv, Svw or Swu. Yes.

  The first resistor 311 and the second resistor 312 included in the first resistance selection circuit 31 have resistance values R1 and R2 that are different from each other, for example, R1 <R2. Also in the first resistor 321 and the second resistor 322 included in the second resistance selection circuit 32 and in the first resistor 331 and the second resistor 332 included in the third resistance selection circuit 33, the resistance value R1, R2 are different from each other. In each of the first resistance selection circuit 31 to the third resistance selection circuit 33, the number of resistors is not limited to two. Three or more may be sufficient.

  When the power supply to the motor 1 is stopped, the first resistance selection circuit 31, the second resistance selection circuit 32, and the third resistance selection circuit 33 cause the motor 1 to have its own weight drop by the selected resistor. A plurality of stages of dynamic braking are provided according to the magnitude of the hourly torque.

  In this embodiment, there are provided three resistance selection circuits including a first resistance selection circuit 31, a second resistance selection circuit 32, and a third resistance selection circuit 33. However, the number of resistance selection circuits varies depending on the coil structure of the motor 1. In the embodiment, since the three-phase motor 1 is used as the motor 1 for driving the breaker, the three first resistance selection circuits 31 to 33 are used, and these are Δ-connected. is there. Although illustration is omitted, it is well known in the art that the Δ connection can be equivalently replaced with a star connection. As a matter of course, the Δ connection means that the Δ connection may be equivalently equivalent on the electric circuit, and means that it is arranged in a triangular shape on the circuit board. is not.

  Of the switches Suv, Svw, and Swu, the first switch Suv selects one of the resistors 311 and 312 by a switching operation. In such a switch Suv, the first selection movable contact 313 is switched between the first contact 314 and the second contact 315, and between the first contact 314 and the second contact 315, the neutral is separated from both the contacts. A mechanical point contact of a type that can take a position is preferable.

  The second switch Svw selects one of the resistors 321 and 322 by a switching operation. The third switch Swu selects one of the resistors 331 and 332 by a switching operation. The switches Suv, Svw, Swu are preferably three-piece integrated type in which switch operation and contact switching are performed simultaneously.

  Each of the first resistance selection circuit 31 to the third resistance selection circuit 33 will be described more specifically. First, the first resistance selection circuit 31 connects one end of the first resistor 311 having the resistance value R1 and one end of the second resistor 312 having the resistance value R2 in common to connect to the Um-phase connection point a of the motor 1. At the same time, the other end of the first resistor 311 is connected to the first contact 314 of the first switch Suv, and the other end of the second resistor 312 is connected to the second contact 315 of the first switch Suv. The first selectable movable contact 313 of the first switch Suv is connected to the Vm phase connection point b.

  Next, the second resistance selection circuit 32 connects one end of the first resistor 321 and the second resistor 322 in common and connects to the Vm phase connection point b of the motor 1. The other end is connected to the first contact 324 of the second switch Svw, and the other end of the second resistor 322 is connected to the second contact 325 of the second switch Svw. The second selection movable contact 323 of the second switch Svw is connected to the Wm phase connection point c.

  The third resistor selection circuit 33 connects one end of the first resistor 331 and the second resistor 332 in common and connects to the Wm-phase connection point c, and connects the other end of the first resistor 331 to the third resistor. The second contact 334 is connected to the first contact 334 of the switch Swu, and the other end of the second resistor 332 is connected to the second contact 335 of the third switch Swu. The third selection movable contact 333 of the third switch Swu is connected to the Um phase connection point a.

  The length and weight of the breaker used in the breaker vary depending on the width of the railroad crossing, the amount of traffic, and the like, and accordingly, the magnitude of the torque when the weight of the breaker is lowered also changes.

  Therefore, in consideration of the magnitude of the torque when the weight of the shut-off can be lowered, that is, the length and weight, the shut-off can, for example, “weight” shut-off can, “medium” shut-off can, “light” shut-off can be used. When the power supply to the motor 1 is stopped, the multi-stage dynamic braking according to the classification is given by the selected resistor.

  In the case of the embodiment, the resistance value R1 of the first resistor is set to a value smaller than the resistance value R2 of the second resistor, the first resistor is made to correspond to the “weight” breaker, and the second resistor is set to “ Corresponds to the “medium” block. For the “lightweight” circuit breaker, the first resistor and the second resistor are removed from the circuit (circuit open), and the motor 1 operating as a generator is brought into an unloaded state. In the case of the three-phase motor 1, the dynamic braking is basically performed so that the current flows evenly for each of the three phases. The configuration may be such that dynamic braking is applied only to two of the three phases.

  The breaker control device according to the present invention further includes a relay contact circuit 5 of a motor breaker relay (not shown), a cam switch 7, a power connection terminal 91, a motor connection terminal 92, and the like. The relay contact circuit 5 includes a first relay contact circuit 51 and a second relay contact circuit 52. The first relay contact circuit 51 includes a first movable contact 511, a first drop contact 512, and a first upper contact 513. The second relay contact circuit 52 includes a second movable contact 521, a second drop contact 522, and a second upper contact 523. The first movable contact 511 and the second movable contact 521 are dropped when the power is turned off and supplied to the circuit breaker, or when the control system detects some failure, and the first drop contact 512 and the second drop contact 522 is contacted. This corresponds to the weight drop operation of the shut-off can.

  When the coil of the motor cutoff relay is excited, the first movable contact 511 and the second movable contact 521 are lifted and contacted with the first hook contact 513 and the second hook contact 523. The motor cut-off relay coil is excited when the motor 1 is supplied with the power of the Us phase, Vs phase, and Ws phase, and is compatible with the motor 1's electric lift-off / lower operation. To do.

  The first drop contact 512 is led to the connection point a of the first resistance selection circuit 31 and the third resistance selection circuit 33 via the cam switch 7. The first movable contact 511 is connected to the Um phase of the motor 1 at the motor connection terminal 92. On the other hand, the second drop contact 522 is led to the connection point b of the first resistance selection circuit 31 and the second resistance selection circuit 32 without passing through the cam switch 7. The second movable contact 521 is connected to the Vm phase of the motor 1 at the motor connection terminal 92. The Wm phase of the motor 1 is led to the connection point c between the third resistance selection circuit 33 and the second resistance selection circuit 32 via the motor connection terminal 92.

  The first upper contact 513 is connected to the Us phase supplied from the power supply on the power connection terminal 91, and the second upper contact 523 is connected to the Vs phase supplied from the power supply on the power connection terminal 91. Is done.

  The cam switch 7 is a switch (limit switch) that is turned on / off by a cam that interlocks with the rotation of the shut-off can, and controls the start timing and stop timing of dynamic braking according to the cam operating angle θ with respect to the switch. The operating angle θ of the cam can be arbitrarily selected in the range of 90 ° to 0 ° according to the length and weight of the shield used. When the cam operating angle θ is 90 °, it means that the power generation braking for the breaker can be started from the lift stop position of the breaker (for example, 85 °) and continues to almost 0 °.

  Next, the operation will be described with reference to FIGS. First, FIG. 2 is a diagram showing dynamic braking for a “weight” shut-off can. In the figure, parts corresponding to those shown in FIG. 1 are given the same reference numerals. First, the railroad crossing interruption operation at the time of a power failure will be described. In this case, the Us phase, the Vs phase, and the Ws phase are turned off, and the motor cutoff relay is in a non-excited state. As a result, in the first relay contact circuit 51 and the second relay contact circuit 52, the first movable contact 511 and the second movable contact 521 are dropped and contact the first drop contact 512 and the second drop contact 522, respectively.

  When the Us phase, the Vs phase, and the Ws phase are turned off, the operating power supply to the motor 1 is also turned off, and the shut-off lever starts its own weight drop. When the weight of the shut-off can be lowered, the motor 1 works as a generator. In the first relay contact circuit 51 and the second relay contact circuit 52, the first movable contact 511 and the second movable contact 521 are in contact with the first drop contact 512 and the second drop contact 522, respectively, and operate as a generator. The Um phase and the Vm phase of the motor 1 are connected to the dynamic braking control circuit 3 via the first relay contact circuit 51 and the second relay contact circuit 52. The Wm phase of the motor 1 is connected to the dynamic braking control circuit 3 via the cam switch 7.

  In the dynamic braking control circuit 3, the first selection movable contact 313 of the first resistance selection circuit 31 contacts the first selection contact 314, and the second selection movable contact 323 of the second resistance selection circuit 32 becomes the first selection contact 324. The third selection movable contact 333 of the third resistance selection circuit 33 contacts the first selection contact 334. As a result, in any of the first resistance selection circuit 31, the second resistance selection circuit 32, and the third resistance selection circuit 33, the first resistors 311, 321 and 331 having the resistance value R1 are selected.

  The resistance value R1 of the first resistors 311, 321 and 331 is smaller than the resistance value R2 of the second resistors 312, 322 and 332 (R1 <R2). Therefore, compared with the case where the second resistors 312, 322, and 332 are selected, a larger current flows through the dynamic braking control circuit 3 and a larger dynamic braking is applied to the motor 1. Appropriate braking according to the weight is applied to the “weight” breaking can with a large weight fall torque. As a result, the “weight” barrier can descend at a safe speed.

In addition, since the weight reduction of the breaker is controlled by the method of selecting the resistor in the dynamic braking control circuit 3, no tool is required and the skill level of the worker is not required.
The cam switch 7 controls the start timing and stop timing of dynamic braking. The start timing and stop timing of power generation braking by the cam switch 7 can be easily set by adjusting and setting the cam operating angle θ. In setting the start timing and stop timing of the dynamic braking, the cam operating angle θ may be adjusted, and the adjustment does not require a tool and does not require the skill of the worker. When the operating angle θ is set, the operating angle θ is determined in consideration of the dead weight lowering time from the rising stop position to the horizontal stopping position (cutting position), the dead weight lowering speed, etc. with the breaker actually attached. In this example, the cam operating angle θ is set to 90 °, and the cam switch 7 is configured substantially at the upper limit position (90 °) of the shut-off can and continues to the horizontal stop position (0 °). Therefore, the breaker is subjected to the time control of the dynamic braking control circuit 3 from the ascending upper limit position to the horizontal stop position.

 Next, the fail safe operation will be described. If the Us phase, Vs phase, and Ws phase of the power supplied to the motor 1 are turned off due to a power failure, obstruction, power supply abnormality, etc., the barrier can be lowered to prevent traffic on the railroad crossing (fail) It must be controlled in the direction of the safe side), and the speed of descent of the barrier must be controlled so as not to impair traffic safety.

  In the present invention, when the power supplied to the motor 1 is turned off due to a power failure, obstruction, power supply abnormality or the like, the first relay contact circuit 51 and the second relay contact circuit 52 use the first movable contact 511 and the second contact. Since the movable contact 521 falls and contacts the first drop contact 512 and the second drop contact 522, respectively, as with the case of the interruption operation at the time of a power failure described above, Power generation braking control is added.

  Therefore, when the power is turned off due to power failure, obstruction, power supply abnormality, etc., it is detected by the motor shutoff relay, and the weight of the shutoff can be lowered so as to be on the fail-safe side. Depending on the operation, the speed of descent of the barrier can be appropriately controlled so that it does not impair traffic safety.

  FIG. 3 is a diagram for explaining another dynamic braking in the “weight” shut-off can. This embodiment relates to dynamic braking by two phases (single phase). Referring to the figure, the first selection movable contact 313 of the first resistance selection circuit 31, the second selection movable contact 323 of the second resistance selection circuit 32, and the third selection movable contact 333 of the third resistance selection circuit 33 are Are also in contact with the first selection contacts 314, 324 and the first selection contact 334. On the other hand, the cam operating angle θ is set to 0 °. That is, since the cam switch 7 is OFF, the circuit from the first relay contact circuit 51 to the connection point a is cut off. Therefore, only in the second resistance selection circuit 32, the first resistor 321 having the resistance value R1 is selected.

  The first resistor 321 having the resistance value R1 functions as a limiting resistor for a current that flows due to an electromotive force generated in the Vm phase and the Wm phase of the motor 1. Compared with the case where dynamic braking is applied to all of the Um phase, the Vm phase, and the Wm phase, the braking force is reduced, but it is suitable for applying braking to the “weight” cutoff mechanism.

  Next, FIG. 4 is a diagram for explaining power generation braking in the “medium amount” shut-off can. In the figure, parts corresponding to the constituent parts appearing in FIGS. 1 to 3 are given the same reference numerals. In the dynamic braking control circuit 3, the first selection movable contact 313 of the first resistance selection circuit 31 contacts the second selection contact 315, and the second selection movable contact 323 of the second resistance selection circuit 32 becomes the second selection contact 325. The third selection movable contact 333 of the third resistance selection circuit 33 contacts the second selection contact 335. As a result, in any of the first resistance selection circuit 31, the second resistance selection circuit 32, and the third resistance selection circuit 33, the second resistors 312, 322, and 332 having the resistance value R2 are selected. The cam operating angle θ is set to 90 °.

  The resistance value R2 of the second resistors 312, 322, 332 is larger than the resistance value R1 of the first resistors 311, 321, 331 (R2> R1). Therefore, compared with the case where the first resistors 311, 321, and 331 are selected, the current flowing through the second resistors 312, 322, and 332 of the dynamic braking control circuit 3 is reduced, and Appropriate braking will be activated according to the “medium” block. As a result, the barrier can be lowered by its own weight at a safe speed according to its weight.

  FIG. 5 shows another example of dynamic braking for a “medium” block. This embodiment is similar to the embodiment of FIG. 3 in terms of power generation braking by two phases (single layer). However, in the third resistor selection circuit 33, the second resistor 332 having a resistance value R2. Is different in that is selected. Since the resistance value R2 is larger than the resistance value R1, it can be said that the resistance value R2 is suitable for braking of a “medium amount” shut-off can that is further reduced in weight in comparison with FIG. The cam operating angle θ is 0 °.

  FIG. 6 shows an example of power generation braking for a lightweight breaker. Referring to the figure, in any of the first resistance selection circuit 31 to the third resistance selection circuit 33, the movable contacts 313, 323, 333 of the first selection switch Suv to the third selection switch Swu are in the neutral position, The 1 resistor 311, 321, 331 and the second resistor 312, 322, 332 are disconnected from the circuit. Therefore, although no-load power generation braking is applied to the motor 1, it is suitable for applying braking to the “lightweight” shut-off lever. The motor 1 is independent of the cam switch 7.

  It is not always essential to perform the dynamic braking shown in FIGS. 2 to 6 from the beginning to the end of the weight drop. In consideration of the load torque of the shut-off rod for the motor 1 operating as a generator, the power generation braking in FIGS. 2 to 6 may be combined as appropriate. For example, even if it is a “weight” breaking can, at the beginning of the drop of the load torque is small (region where the operating angle θ is large), the dynamic braking for the lightweight breaking can FIG. 6 is applied, and the load torque increases, The power generation braking shown in FIGS. 5, 4, 3 and 2 is appropriately combined.

  FIG. 7 shows a case in which the breaker is raised, and the movable contacts 511 and 521 of the relay contact circuits 51 and 52 are switched to the upper contacts 513 and 523 when the motor breaker relay is excited. Therefore, the dynamic braking control circuit 3 is disconnected from the motor 1.

  The present invention mainly provides an electric railroad crossing breaker for railroads, but is not limited thereto, and may be applied to an electric breaker used for gates such as parking lots and toll collection points on toll roads. it can.

  Although the contents of the present invention have been specifically described above with reference to the preferred embodiments, it is obvious that those skilled in the art can take various modifications based on the basic technical idea and teachings of the present invention. It is.

DESCRIPTION OF SYMBOLS 1 Motor 3 Power generation braking control circuit 31 1st resistance selection circuit 32 2nd resistance selection circuit 33 3rd resistance selection circuit 5 Elevation switching circuit 7 Cam switch

Claims (5)

A motor that drives the shut-off can;
A dynamic braking control circuit comprising a plurality of resistors having different resistance values and a switch for selecting contacts of the resistors,
When power supply to the motor is stopped, the switch is switched and the contact of the resistor to be connected is selected or set to a neutral position away from the contact , and the shut-off pin is provided for the motor. Gives multiple levels of dynamic braking divided according to the magnitude of the torque when dropping by its own weight,
Shut-off control device. 2. The shut-off control device according to claim 1, wherein the motor is a three-phase motor, and the dynamic braking control circuit selects a single phase or two phases of the motor, and A shut-off can control device that applies the above-described dynamic braking according to the magnitude of the torque when the weight of the shut-off can be lowered . 3. The shut-off control device according to claim 1, wherein the dynamic braking control circuit includes at least one resistance selection circuit, and the resistance selection circuit includes a plurality of resistors and a switch. Each of the plurality of resistors has a resistance value different from each other, and the switch selects at least one resistor from the plurality of resistors by a switching operation. 4. The breaker control device according to claim 1 , wherein a start angle and a stop of the dynamic braking are set by setting an operating angle of a cam with respect to the switch in conjunction with rotation of a breaker rotating shaft. A shut-off can control device that includes a cam switch for controlling the timing, and sets the braking operation according to the magnitude of the torque at the time of weight reduction of the shut-off can by setting the operating angle to 0 degree . A breaker control device and a breaker including a breaker, wherein the breaker control device is described in any one of claims 1 to 4,
The shut-off can is driven by the shut-off can control device,
Breaker.

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