JP2010228580A - Barrier - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To visualize a load of an electric motor in order to simplify adjustment work and reduce and adjustment time. <P>SOLUTION: This barrier includes: a blocking bar holding portion (29) for holding a blocking bar (30); the bi-directionally rotatable electric motor 25; a rotation transmission section (27) having a rotating shaft swingingly supporting the blocking bar holding portion (29) and a rotation/swinging converting mechanism transmitting the rotational movement of the electric motor 25 to the rotating shaft; and a control section 21 composed of 22, 23 and controlling the rotational movement of the electric motor 25 according to a received train input signal. In the barrier, current detection members 41 are provided for detecting drive currents of the electric motor 25, a current/load conversion means 43 is provided for determining the load of the electric motor 25 from the detected result, and a visible load display member 45 is provided for displaying the load. The calculation part of the current/load conversion means 43 and the logical part 22 of the control section are achieved by a program installed into the same MPU (microprocessor unit). <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a railroad crossing breaker, and more particularly to a railroad crossing breaker that employs an electric motor such as a servomotor as a drive source for raising and lowering a barrier rod.

  A railroad crossing breaker 20 shown in a block diagram in FIG. 2 is installed on a railroad crossing road, and is equipped with a barrier rod 30 and swings the barrier rod 30 from horizontal to vertical for opening and closing the railroad crossing. Therefore, the railroad crossing breaker 20 has a barrier rod holding portion 29 for holding the barrier rod 30, a motor 25 (electric motor) that can be rotated in two directions, and the barrier rod 30 is swung for raising and lowering. At this time, a rotation transmission unit 27 that transmits the rotation motion of the motor 25 to the barrier rod holding unit 29 and a control unit 21 that controls the rotation motion of the motor 25 according to the train entry signal TER received from the external railroad crossing control device 11 are provided. Being equipped.

  Among them, the control unit 21 is roughly divided into a control logic circuit 22 for processing the train entry signal TER and the like, and a motor drive circuit 23 for outputting the motor drive current to directly drive the motor 25. In some cases, both circuits 22 and 23 are operated by a power supply voltage DC24V (for example, a DC voltage of 24V) supplied from the power supply device 12 through the multicore cable 13 or the connection box 14 or the like. In some cases, the logic circuit 22 operates with a power supply voltage DC24V, and the motor drive circuit 23 operates with a power supply voltage AC200V (for example, an AC voltage of 200V) (see, for example, Patent Document 2).

  Further, brushless motors and servo motors are increasingly used for the motor 25, and a rotation detector 26 such as an optical rotary encoder is usually attached to detect the rotation state, for example, position information. Further, the rotation control of the motor 25 is performed by feedback control based on the detection signal, and the lifting / lowering operation of the blocking rod 30 can be flexibly and stably performed according to the setting in the setting unit 24 using the control. Yes, for example, the setting unit 24 can set operation parameters such as the raising / lowering time of the blocking rod 30 and the vertical stop position. In some cases, a lower limit detector or an upper limit detector is introduced instead of the setting unit 24 (see, for example, Patent Document 2).

  Further, the rotation transmission unit 27 is provided with a rotation shaft that supports the blocking rod holding unit 29 so as to be swingable, and a rotation / swing conversion mechanism that transmits the rotational motion of the motor 25 to the rotation shaft. The balancer 28 that reduces the load side rotational force that is undesirably applied to the rotating shaft from the blocking rod holding portion 29 based on the cantilever state of the blocking rod 30 is applied to a weight type balancer using a weight, a link mechanism, and an urging force. If a balancer combined with a member is provided (see, for example, Patent Document 1), the balancer is omitted by increasing the motor drive voltage or adopting a belt reduction mechanism with a small inertia and a large reduction ratio. In some cases (for example, see Patent Document 2).

JP 2005-112151 A JP 2006-069333 A

By the way, with regard to the operating characteristics of a railroad crossing breaker, it is necessary to keep the motor load when the breaking rod is raised below the rating, and to suppress the variation in the weight drop time of the breaking rod when there is no power supply. If there is, a load applied to the motor is adjusted using a reduction mechanism or an appropriate additional mechanism if there is no balancer.
However, although the dead weight drop time can be confirmed by looking at the operation of the interrupting rod, the load applied to the motor has not been able to visually recognize the load amount conventionally, so the sound generated by the motor and the transmission member, etc. He relied on indirect perception to estimate the load. For this reason, it takes time to make adjustments until the worker becomes skilled, and the heavy burdens such as securing the number of people and maintaining the skill level still remain for the skilled worker.
Therefore, in order to simplify the adjustment work and reduce the adjustment time, it is a technical problem to visualize the load amount of the motor in order to easily adjust the load applied to the motor.

  The railroad crossing breaker of the present invention (Solution means 1) was invented to solve such a problem, a barrier rod holding part for holding the barrier rod, an electric motor capable of bidirectional rotation, A rotary transmission unit having a rotary shaft that supports the barrier rod holding unit in a swingable manner, and a rotary swing conversion mechanism that transmits the rotary motion of the electric motor to the rotary shaft, and the electric motor according to a train entry signal received A crossing breaker having a control unit for controlling the rotational motion of the motor, a current detection member for detecting a drive current of the motor, a current / load amount conversion means for obtaining a load amount of the motor from the detection result, and A visible load amount display member for displaying the load amount is provided.

  Further, the railroad crossing breaker according to the present invention (solution means 2) is the railroad crossing breaker of the above solution means 1, wherein the calculation part of the current / load amount conversion means and the logic part of the control unit are the same. It is realized by a program installed in the system.

In such a railroad crossing breaker of the present invention (Solution 1), the drive current of the motor, which is a physical quantity corresponding to the load amount of the motor, is detected by the current detection member, and the current / load amount is converted from the detection result. The load amount of the electric motor is obtained by the means, and the load amount is displayed in a visible manner on the load amount display member. Thereby, the load amount of the electric motor is visualized.
Therefore, according to the present invention, it is possible to realize a railroad crossing breaker in which the load amount of the motor is visualized, the load of the motor is easily adjusted, and the adjustment time is short.

  Further, in the railroad crossing breaker of the present invention (Solution means 2), the calculation part of the current / load amount conversion means is programmed in the same manner as the logic part of the control part and then installed in the same electronic circuit. The function expansion for improving the adjustment work described above can be easily realized at low cost.

The structure of the principal part which improved about Example 1 of the railroad crossing breaker of this invention is shown, (a) is a block diagram of a load amount visualization means, (b) is a front panel of a setting part. It is a block diagram which shows the general | schematic structure of the conventional level crossing cutoff machine.

With respect to such a railroad crossing breaker of the present invention, a specific mode for carrying out this will be described below with reference to Example 1 shown in FIG.
In the drawings, the same reference numerals are given to the same components as those in the prior art, and therefore, repeated explanations are omitted. Hereinafter, the differences from the prior art will be mainly described.

A specific configuration of the first embodiment of the railroad crossing breaker according to the present invention will be described with reference to the drawings. FIGS. 1A and 1B show the structure of the main part that has been improved. FIG. 1A is a block diagram of the load amount visualization means 40, and FIG.
This level crossing cutting machine is different from the conventional machine 20 described above in that load amount visualization means 40 is added (see FIG. 1A).

The load amount visualization means 40 includes a current detection member 41, a detection signal input circuit 42, a current / load amount conversion means 43, a display drive circuit 44, and a load amount display member 45.
The current detection member 41 may be a well-known member using, for example, a coil or a Hall element, and is attached to a power supply line extending from the motor drive circuit 23 to the motor 25 (electric motor) so as to detect the drive current of the motor 25. It has become.
The detection signal input circuit 42 is composed of, for example, an insulation amplifier, an A / D conversion circuit, and the like, and digitizes an analog signal detected by the current detection member 41 for use in calculation by the current / load amount conversion means 43.

  The current / load amount conversion means 43 calculates a motor load amount by performing a predetermined calculation from the detected current value input via the detection signal input circuit 42. In addition to being determined in advance based on specifications and the like, the calculation formula can be finely adjusted for each device by setting or changing parameters based on experimental measurement or the like. Here, the calculation results are also classified into five levels: “light”, “slightly light”, “appropriate”, “slightly heavy”, and “heavy”. The calculation part of such current / load amount conversion means 43 is embodied by a program, and the control logic circuit 22 is embodied mainly by a microprocessor system (MPU) which is a programmable electronic circuit. Are installed in the same microprocessor system together with the logic part of the control logic circuit 22.

  The display drive circuit 44 includes, for example, an output port of a digital I / O port, a buffer, and the like, and the load amount display member 45 corresponds to the load amount display member 45 including a plurality of light emitting diodes in this example. The display state of the load amount display member 45 is switched depending on whether or not the display drive current is supplied. If the load amount display member 45 is a digital numerical display method, the display drive circuit 44 may be a latch circuit or the like corresponding thereto. If the load amount display member 45 is an analog display method, the display drive circuit 44 is D / A converted. A circuit or the like may be used.

  In this example, the load amount display member 45 is composed of five light emitting diodes, and is provided by exposing the light emitting portion on the front panel of the setting portion 24 suitable for visual recognition during adjustment work (see FIG. 1B). ). The load amount display member 45 is a so-called balance gauge arranged in a row on the left and right sides. When the load amount of the motor is “light” according to the output of the current / load amount conversion means 43 via the display drive circuit 44, When only one is lit and the load on the motor is “slightly light”, “appropriate”, or “slightly heavy”, the second, third, and fourth from the left side are lit, and the load on the motor is “heavy” ", Only one of the right end lights up.

  The use mode and operation of the railroad crossing breaker of the first embodiment will be described. In response to a train entry signal TER, installed on a railroad crossing road, or swinging the barrier rod 30 mounted on the barrier rod holding portion 29 from horizontal to vertical to open and close the railroad crossing. Since general matters such as swinging the blocking bar 30 by rotating the motor 25 are the same as in the past, the operation and advantages of the added load visualization means 40 will be described here.

  When the shut-off rod 30 is raised and lowered, a motor drive current corresponding to an electric motor load, which is a load applied as a torque to the rotating shaft of the motor 25 at that time, flows from the motor drive circuit 23 to the power supply line to the motor 25, and the current is a current. It is detected by the detection member 41 and input to the current / load amount conversion means 43 by the detection signal input circuit 42. The detected current value is converted into a motor load amount by the current / load amount conversion means 43 and classified into five levels, and is displayed on the load amount display member 45 via the display drive circuit 44.

  Since the load amount display member 45 is exposed on the front panel of the setting unit 24 that is easy to visually recognize, the load amount of the motor being lifted and lowered becomes obvious at a glance. Even when the shut-off rod 30 is stopped at the ascending position or the descending position, the motor driving current flows if the motor 25 is loaded, so that the electric motor load amount is clearly displayed on the load amount display member 45 at a glance. Furthermore, when the power supply to the motor 25 is stopped and the blocking rod 30 is lowered by its own weight, even if the length of the blocking rod 30 varies, the load adjustment of the blocking rod 30 and the balancer 28 can be adjusted. Due to the difference between the barrier rod 30 and the balancer 28, the barrier rod 30 can be lowered at a constant speed.

  Thus, by visualizing the motor load confirmation function (balance gauge function) of the railroad crossing breaker, when adjusting the load of the motor using a balancer, a reduction mechanism, etc., the load amount display member 45 is displayed. By making adjustments while looking at the screen, the load on the weight side and the cutoff side can be easily and accurately checked so that anyone can easily adjust the equipment in a short time. became. Moreover, no matter who makes the adjustment, the adjustment work can be carried out under substantially the same conditions, and the same adjustment result can be obtained. Further, since the LED is used for display, it is conspicuous by light emission (lighting) even at night, so that the balance state can be adjusted and confirmed easily and accurately even during night work.

[Others]
In the above-described embodiment, the electric motor load amount is only displayed in a visually recognizable manner on the setting unit 24 for ease of adjustment work. However, the current detection member 41 is installed in a place other than the setting unit 24 as long as it is visible. You may do it. In addition, since the torque applied to the motor 25 can be constantly monitored, it can also be used as a breakage detector for a broken rod by outputting the detection result of abnormal fluctuation of the motor load amount to the outside using a medium such as a relay. can do.

11 ... Railroad crossing control device, 12 ... Power supply device, 13 ... Multi-core cable,
14 ... Connection box, 20 ... Railroad crossing breaker, 21 ... Control unit,
22 ... logic circuit for control, 23 ... motor drive circuit, 24 ... setting unit,
25 ... motor (electric motor), 26 ... rotation detector, 27 ... rotation transmission part,
28 ... balancer, 29 ... blocking bar holder, 30 ... blocking bar,
40 ... Load amount visualizing means, 41 ... Current detection member,
42 ... detection signal input circuit, 43 ... current / load amount conversion means,
44 ... Display drive circuit, 45 ... Load amount display member

Claims (2)

  A blocking rod holding portion for holding the blocking rod, an electric motor capable of rotating in two directions, a rotating shaft that supports the blocking rod holding portion in a swingable manner, and a rotary swing that transmits the rotational motion of the motor to the rotating shaft. A current detection member for detecting a drive current of the electric motor in a railroad crossing breaker comprising: a rotary power transmission unit having a dynamic conversion mechanism; and a control unit that controls the rotational motion of the electric motor according to a received train entry signal; A railroad crossing breaker comprising: current / load amount conversion means for obtaining the load amount of the electric motor from the detection result; and a visually visible load amount display member for displaying the load amount.   2. The railroad crossing breaker according to claim 1, wherein the calculation part of the current / load amount conversion means and the logic part of the control part are realized by a program installed in the same electronic circuit.

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