JP2014091418A - Railroad crossing gate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a railroad crossing gate that eliminates the need for manual intervention after start of mounting position adjustment of a position detector, by automatically setting an upper side position and a lower side position in the ascending/descending range of a shutdown rod after start of the adjustment.SOLUTION: A railroad crossing gate includes: a motor 14 for making a shutdown rod 20 swing in an ascending/descending range; a control unit 12 for performing feedback control by a motion state detection signal Pf indicating a motor rotating position; an upper limit stopper of an ascent limit position; a lower limit stopper of a descent limit position; a lower side position detector 16 of the ascending/descending range; and a driven state detector 13a for detecting a driven state of the motor 14. Automatic setting means for the ascending/descending range of the control unit 12 makes the motor 14 ascend and descend, and it is detected by a driven state detection signal If that the ascending/descending limit is reached. Based on the motor rotating position in both detection, each of an upper side position and a lower side position of the ascending/descending range is associated with the motor rotating position. The association is distributed proportionally, based on a fixed value concerning the swinging of the shutdown rod, and also the detection of the lower side position detector 16 is completion conditions.

Description

  The present invention relates to a railroad crossing breaker that opens and closes a railroad railroad crossing with a barrier bar, and more particularly to a railroad crossing barrier that feedback controls a motor (electric motor) of a drive source that lifts and lowers the rail bar by cantilever swing.

A railroad crossing breaker (see, for example, Patent Documents 1 to 5) is installed at a railroad crossing, is equipped with a barrier rod, and swings the barrier rod from horizontal to vertical from vertical to horizontal for opening and closing the railroad crossing. For this purpose, the barrier rod is held in a cantilever state outside the housing, and the rotating main shaft with the barrier rod retaining portion attached to the end is axially rotated by the motor in the housing.
In order to eliminate such a balancer, there are an increasing number of such railroad crossing breakers that use a servo motor to control the position of the barrier rod, and in that case, the position of the barrier rod must be fed back to the controller (control unit). However, because of the necessity of protection and wiring restrictions, the position detection of the breaking rod is based on the position information corresponding to the rotation angle of the rotating spindle to which the breaking rod is attached and the position corresponding to the rotation angle of the motor spindle that rotates the rotating spindle. This is done indirectly by detecting information.

  Further, as the position information corresponding to the rotation angle of the rotation main shaft described above, each position over the entire range of the rotation angle may be detected. However, this is left to the detection of the rotation angle of the motor main shaft in a normal state. The upper position and the lower position related to the raising / lowering range, which is the range for raising and lowering, are detected. The detection of the rotation angle of the motor spindle is performed by the resolver attached to the motor, so each position can be easily found, but it is limited to the relative position, whereas the detection of the upper and lower positions related to the rotation angle of the rotation spindle is an absolute position. This is because it can be easily performed with a switch or the like that understands. By detecting the position of such a combination, the swing-type railroad crossing breaker swings the barrier rod in a lift range of approximately 0 ° to 90 ° (vertical to horizontal, upper position to lower position). It has become.

Furthermore, a railroad crossing breaker is generally provided with a mechanical stopper in the housing so that the position and posture of the barrier rod will not change drastically even in the unlikely event of control abnormality or control failure. A stopper and a lower limit stopper are provided so that the operation cannot be performed when the elevating limit of about −5 ° to about 95 ° slightly wider than the elevating range is exceeded.
In addition, there is a railroad crossing breaker that detects the drive current of the motor. Based on the detection signal of the motor drive current, it is possible to determine whether or not there is interference during the lifting / lowering control of the barrier rod (see Patent Document 1), and the motor load. The amount is calculated and displayed (see Patent Document 4).

JP 2002-160635 A (Patent No. 3749111) JP 2005-112151 A JP 2006-069333 A JP 2010-228580 A Japanese Patent Application No. 2011-026589

  In such a conventional railroad crossing breaker, among the detectors, the position detectors that detect the upper and lower positions of the lifting / lowering range of the barrier rod are attached to the main body of the railroad crossing barrier in the housing as described above. However, the main body of the railroad crossing breaker is manufactured by sheet metal welding structure or casting. For this reason, the position detector is provided with an adjustment part for attaching the position detector, and the level crossing blocker is assembled, and after the position detector is also attached, the position detector is finally adjusted with high accuracy. Therefore, it took a long time to adjust the position of the position detector. Specifically, in order to install the position detector at an appropriate angle while measuring the rotation spindle angle of the railroad crossing breaker with an angle meter etc. with the level crossing barrier temporarily installed on a horizontal reference plane, It took a very long time to adjust the mounting position of the position detector that detects the vertical position of the lifting range.

In order to reduce the burden of adjusting the mounting position of the position detector of the breaker as described above, the setting unit is operated to move the lift stop position (upward position of the lift range) and the drop stop position (lower position of the lift range). There is also a railroad crossing breaker that has been finely adjusted (see Patent Document 1).
However, since the adjustment is performed while manually operating an operation member such as a switch, manual intervention is indispensable before and after the start of the adjustment.
Therefore, in order to further reduce the burden on the position detector mounting position adjustment work, the upper and lower positions of the lifting / lowering range of the barrier rod are automatically set after the adjustment to eliminate the need for manual intervention after the adjustment is started. Realizing the railroad crossing breaker set in step 1 is a technical issue.

  The railroad crossing breaker of the present invention (Solution means 1) was devised in order to solve such a problem, and a motor for swinging the barrier rod in the lifting range and a relative axis related to the main shaft of the motor. A control unit that controls the rotational motion of the motor by detecting and feeding back a motion state in which the motor rotational position, which is a rotation angle, is detected, and raises the barrier rod at a rising limit position that exceeds the upper position of the lifting range. An upper limit stopper that stops by mechanical contact, a lower limit stopper that stops the lowering of the blocking rod by mechanical contact at a lower limit position that exceeds the lower position of the lifting range, and the blocking rod In a railroad crossing breaker having a lower position detector that detects that it is at a lower position and a driving state detector that detects the driving state of the motor, the controller is provided with a lifting range automatic setting means The raising / lowering range automatic setting means detects that the motor reaches the rising limit position by rotating the motor to the rising side based on the detection result of the driving state detector, and rotates the motor to the lowering side. Detecting that the lower limit position has been reached based on the detection result of the drive state detector, and based on the motor rotation position at the time of both detections, the upper and lower positions of the lift range and the motor rotation position respectively. It is characterized by the fact that they are associated with each other.

  Further, the railroad crossing breaker of the present invention (solution means 2) is the railroad crossing breaker of the above solution means 1, wherein the lifting range automatic setting means is configured such that the motor rotation position and the lowering limit corresponding to the rising limit position. The motor rotation range extending to the motor rotation position corresponding to the position is apportioned based on a predetermined value related to the swinging movement of the blocking rod, so that the upper position and the lower position of the lifting range are respectively rotated by the motor. It is characterized by being associated with a position.

  Further, the railroad crossing breaker according to the present invention is (the solution means 3), the railroad crossing breaker of the above solution means 1 and 2, wherein the lifting range automatic setting means includes a lower position of the lifting range and the motor rotation position. When associating with each other, the fact that the detection that the blocking bar is at the lower position is made by the lower position detector is a necessary condition for the completion of the correspondence.

In such a railroad crossing breaker of the present invention (Solution 1), when the lift range automatic setting means is activated, the lift limit position of the lift limit is detected using the drive state of the motor detected by the drive state detector. And the lower limit position are detected, and the absolute position ascent / descent limit is associated with the relative motor rotation position, and the ascending / descending range narrower than the ascent / lower limit is determined based on the motor rotation position thus established. The upper position (upward stop position) and the lower position (downward stop position) are associated with the motor rotation position. Therefore, if the lift range automatic setting means is operated after the position detector is mounted, the lift range is determined without bothering humans. Therefore, in the position detector, the blocking rod is at the lower position of the lift range, etc. This is not necessary until the moment when the blocking rod reaches the lower position of the lifting range, etc., so that the allowable range of the detector mounting position is expanded, and as a result, the position detector The burden of adjusting the mounting position is reduced.
Therefore, according to the present invention, it is possible to realize a railroad crossing breaker that automatically sets the upper position and the lower position of the lifting / lowering range of the barrier after the adjustment is started.

Further, in the railroad crossing breaker of the present invention (Solution means 2), the ascent and descent limit positions of the ascending / descending limit determined by the upper limit stopper and the lower limit stopper that stop the barrier rod by mechanical contact are machine differences, that is, Where there is little variation at each level crossing breaker, the motor rotation range corresponding to it is allocated based on the default value, so that the lower position of the lifting range etc. is associated with the motor rotation position. Since the predetermined value such as the ratio is determined from the design value of the railroad crossing breaker and the measured value of the swing state of the actual machine, undesired variations in the lower position of the lifting range and the like can be kept small.
Therefore, according to the present invention, it is possible to realize a railroad crossing breaker having a small setting error even when the upper position and the lower position of the lifting range are automatically set.

Furthermore, in the railroad crossing breaker of the present invention (Solution means 3), although the allowable range of the position detector mounting position has expanded, the position of the position detector is the minimum function of the position bar. As the arrival of the function is adopted as a necessary condition for the automatic setting of the lifting range, the completion of the lowering of the barrier is explicitly confirmed, so the safety of the railroad crossing breaker is ensured.
Therefore, according to the present invention, it is possible to realize a railroad crossing breaker that maintains the safety by confirming the lowering of the barrier rod even when the upper position and the lower position of the lifting range are automatically set.

About Example 1 of this invention, the structure of a railroad crossing breaker is shown, (a) is a whole block diagram, (b) is a general | schematic flowchart of the content of control. It is a flowchart which concerns on the raising / lowering operation | movement at the time of initial setting, and an raising / lowering range setting process.

A specific form for carrying out such a railroad crossing breaker of the present invention will be described with reference to Example 1 below.
The first embodiment shown in FIGS. 1 to 3 embodies all the above-described solving means 1 to 3 (claims 1 to 3 at the beginning of the application).
In these drawings, for simplification and the like, a housing, a fastener such as a bolt, a coupling tool such as a hinge, a drive source such as an electric motor, a transmission member such as a reduction gear, and an electric circuit such as a motor driver The details of the electronic circuit such as the controller and the details of the electronic circuit such as the controller are not shown in the figure, and those necessary for the explanation of the invention and related ones are mainly shown.

  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. FIG. 1A is an overall block diagram of the railroad crossing breaker 10, and FIG. 1B is a schematic flowchart of control contents of the control unit 12.

  The railroad crossing breaker 10 (see FIG. 1 (a)) includes a setting unit 11, a control unit 12, a drive unit 13, a drive state detector 13a, a motor 14, an upper position detector 15 and a lower unit made of an electronic circuit or an electric member. A side position detector 16, an upper limit stopper 17, a lower limit stopper 18, a rotation main shaft 19, and a speed reduction transmission mechanism 19a made up of mechanical parts are provided. Most of them are stored in a housing (not shown), but the operation member and the display member of the setting unit 11 protrude to the outer surface of the housing for manual operation and visual confirmation. At least one end portion protrudes from the housing to hold the blocking bar 20.

Since each of these hardware members may be the same as a well-known product (for example, refer patent documents 1-4), it demonstrates concisely.
The setting unit 11 includes an operation member such as a switch and can designate whether to operate in the initial setting mode or another operation mode, and includes a display member such as a light emitting diode (LED) and the operation state is normal. Can be displayed.

  The control unit 12 is composed of an electronic circuit such as a programmable microprocessor or system LSI, and is a relay signal of the binary train entry signal TER using a relay signal received from an external level crossing control device by executing an installed control program. Is also input as a binary up / down command CR1, and a motor control signal Sm is generated by discriminating whether to ascend or descend according to it, and at this time, a motion state detection signal Pf related to the motor 14 is used. Feedback control.

The drive unit 13 generates a three-phase motor drive current according to the motor control signal Sm given from the control unit 12 so that the rotational motion of the motor 14 follows the control of the control unit 12, and supplies this to the motor 14. Is.
The drive state detector 13a is composed of, for example, a clamp-type current transformer, detects a motor drive current supplied from the drive unit 13 to the motor 14, and sends it to the control unit 12 as a drive state detection signal If. It has become.

  The motor 14 is a servo motor or an induction motor capable of feedback control, and is an electric motor that can generate torque that can swing the shut-off rod 20 in the up-and-down range. A reduction transmission mechanism 19 a is connected to the motor main shaft 14 a. . The motor 14 is provided with a resolver for detecting the rotation angle of the motor spindle 14a. The resolver is used as a motion state detector 14b, and the detection signal is controlled as a motion state detection signal Pf. By sending it to the unit 12, a motion state in which the motor rotation position, which is a relative rotation angle related to the motor spindle 14 a, can be detected and fed back to the control unit 12.

The rotation main shaft 19 is composed of a shaft member that is supported so as to be capable of rotating the shaft in a posture in which the axial direction is horizontal, and has a shut-off rod 20 cantilevered outside the housing, and is connected to a speed reduction transmission mechanism 19a inside the housing.
The speed reduction transmission mechanism 19a is composed of an appropriate speed reduction gear or link mechanism, and is interposed between the motor main shaft 14a and the rotation main shaft 19, so that the motor 14 and the motor 14 together with the rotation main shaft 19 assists the swinging of the shut-off rod 20. It has become.

The lower limit stopper 18 is formed of a fixed member provided at a position where the rotation main shaft 19 or the speed reduction transmission mechanism 19a may interfere with the rotation position in the housing, and the lowering stopper 18 is moved at the lower limit position of the lifting limit. It is designed to stop at the point of contact.
The upper limit stopper 17 is formed of a fixed member provided at a position where the rotation main shaft 19 or the speed reduction transmission mechanism 19a may interfere with the rotation position in the casing, and the upper limit stopper 17 is moved to the upper limit position of the lift limit. It is designed to stop at the point of contact.

  The lower position detector 16 and the upper position detector 15 are made of a response member such as a snap switch, a limit switch, or a contact spring using a leaf spring, and correspond to the rotation position of the rotation main shaft 19 or the speed reduction transmission mechanism 19a in the casing. It is designed to turn on and off. The upper position detector 15 turns on the value of the upper position detection signal ULS when the rotary spindle 19 or the speed reduction transmission mechanism 19a is at a rotational position where the blocking rod 20 is at the upper position (lift stop position) of the lifting / lowering range. Otherwise, the value of the upper position detection signal ULS is turned off. The lower position detector 16 detects the lower position detection signal LLS when the rotary main shaft 19 or the speed reduction transmission mechanism 19a is at a rotational position where the blocking rod 20 is at the lower position (lowering stop position) of the lifting range. In other cases, the value of the lower position detection signal LLS is turned off. These position detection signals LLS and ULS are both sent to the control unit 12.

  Regarding the lifting limit and lifting range that define the operating range of the barrier 20, the vertical limit is 0 ° and the horizontal is 90. The lifting limit is the movable range under the mechanical regulation of the barrier 20, and By manufacture, the rising limit position of the lifting limit is set to -5 ° and the falling limit position of the lifting limit is set to 95 °. The lifting range is a swinging range during normal operation in which the control unit 12 raises and lowers the barrier rod 20 in accordance with the lifting command CR1, and the upper position of the lifting range is such that the barrier rod 20 is lowered by its own weight when an abnormality or failure occurs. In addition, considering the avoidance of obstacles above depending on the installation location of the railroad crossing breaker, it is initially set to 0 ° to + 30 °, and the lower position of the lifting range is shut off in case of an abnormality or failure. In order to keep 20 almost horizontal, it is initially set to any one of 85 ° to 91 ° in consideration of the inclination of the foundation on which the railroad crossing breaker is installed, the positional relationship with the road, and the deflection of the barrier.

  Since the ascending / descending range is set by the program processing of the control unit 12, the software of the control unit 12 will be described (see FIG. 1B). When the operation member of the setting unit 11 is operated to select the normal operation mode and the railroad crossing breaker 10 is turned on, the control unit 12 checks the operation mode at the time of activation (step S21), and is not the initial setting mode (No ), The elevation control is repeatedly performed according to the elevation command CR1 (step S22). On the other hand, when the operation member of the setting unit 11 is operated to select the initial setting mode and the power is supplied to the railroad crossing breaker 10, the control unit 12 checks the operation mode at the time of activation (step S21), and the initial setting mode. Therefore (Yes), the elevation limit is detected and the elevation range is automatically set (step S23). Since this automatic setting method is a feature of the present invention, it will be described in detail in the following operation description.

  About the level crossing cutting machine 10 of this Example 1, the use aspect and operation | movement are demonstrated referring drawings. FIG. 2 is a flowchart relating to the lifting operation and the lifting range setting process at the time of initial setting. Installation at a railroad crossing and normal operation for opening and closing a railroad crossing may be the same as before (see Patent Documents 1 to 4), so here, at the final stage of manufacturing the railroad crossing breaker 10, immediately after installation at the site, etc. Of the operations performed in the initial setting mode, the automatic setting of the lifting range will be described in detail.

  The detection of the lifting limit and the automatic setting of the lifting range are executed by the program of the lifting range automatic setting means among the initial setting programs installed in the control unit 12. Specifically, the ascending operation is performed at a low speed that does not cause an excessive impact even if it comes into contact with the upper limit stopper 17 (step S20). Waiting for the value of the drive state detection signal If to exceed a predetermined threshold It based on the rapid increase of the detection signal If (step S21, No), and if it exceeds (step S21, Yes), it rises to the lift limit position of the lift limit Since it is understood that the upper limit stopper 17 is forcibly stopped, the upper position detection signal ULS is further checked for on / off (step S22), and after confirming that it is turned on correctly (step S22). , On), and setting the rise limit position of the lift limit by writing the value of the motion state detection signal Pf at that time in a nonvolatile memory or the like Step S23), and sets the upper limit before the deceleration position (upper position inching starting point) in the value of the motion state detection signal Pf corresponding to from slightly descending side position it.

  Then, the descent operation is performed at a low speed that does not cause excessive impact even if it comes into contact with the lower limit stopper 18 (step S24), and the drive state is detected even when the descent is prevented by mechanical contact under feedback control. Based on the rapid increase of the signal If, it waits for the value of the drive state detection signal If to exceed a predetermined threshold It (No at Step S25), and when it exceeds (Step S25, Yes), it descends to the lower limit position of the upper and lower limit. Therefore, the lower position detection signal LLS is further checked for on / off (step S26), and it is confirmed that it is correctly turned on (step S26). , On), and setting the descent limit position of the ascent / descent limit by writing the value of the motion state detection signal Pf at that time in a nonvolatile memory or the like (Step S27), and sets the lower front deceleration position (lower position inching starting point) in the value of the motion state detection signal Pf corresponding than a little raised side position it.

  Thus, when the ascent / descent limit is detected and associated with the value of the motion state detection signal Pf, the upper and lower positions of the ascending / descending range are set in correspondence with the value of the motion state detection signal Pf based on the detection (step S28). ). Specifically, on the premise that the rotary main shaft 19 and the shut-off shaft 20 are designed and manufactured to swing between, for example, a rising limit position of −5 ° and a falling limit position of 95 °, for example, Is set at 0 °, and the lower position of the lifting range is set at 91 °, the two values already detected, the value Pf () of the motion state detection signal Pf corresponding to the ascent limit position. −5) and the value Pf (95) of the motion state detection signal Pf corresponding to the lower limit position, the value of the motion state detection signal Pf corresponding to the upper position of the lift range can be calculated by the proportional expression [Pf (−5 ) + {Pf (95) −Pf (−5)} × {(0) − (− 5)} / {(95) − (− 5)}], corresponding to the lower position of the lifting range The value of the motion state detection signal Pf is a proportional expression [Pf (−5) + {Pf (95) −Pf (−5)]. × {(91) − (− 5)} / {(95) − (− 5)}] and writing these calculated values in a nonvolatile memory or the like, Set.

  Thus, after the automatic setting of the lift range associated with the motion state detection signal Pf is completed, post-processing at normal time is performed (step S29), for example, setting completion history data is recorded in the nonvolatile memory and the setting unit 11 is normal. Turn on the status indicator and finish the initial setting. When the upper position detection signal ULS is turned on / off, it is turned off instead of on (step S22, Off), or when the lower position detection signal LLS is turned on / off, it is turned off instead of on. If so (step S26, Off), post-processing at the time of abnormality is performed (step S29a), for example, the setting abnormality history data is recorded in the nonvolatile memory, and the abnormality state indicator lamp of the setting unit 11 is turned on to initialize the setting. Exit.

  Thus, in the railroad crossing breaker 10, when the power is turned on after operating the operation member of the setting unit 11 to select the initial setting mode, the control unit 12 causes the lifting limit to correspond to the motion state detection signal Pf. Then, the elevation range is automatically set in association with the motion state detection signal Pf. In this way, if the setting process is started by instructing the setting of the lifting range, the setting process is completed automatically without requiring manual intervention after the setting process is started. There is no effect, and the lifting range is set quickly and accurately.

  Moreover, in the railroad crossing breaker 10, when the lifting range is automatically set, the motor rotation position Pf (−5) corresponding to the rising limit position of the lifting limit associated with the motion state detection signal Pf and the lifting limit are set. The motor rotation range Pf (−5) to Pf (95) extending to the motor rotation position Pf (95) corresponding to the lower limit position is set to the increase limit position of the upper limit / lower limit which is a predetermined value related to the swinging of the shut-off rod 20. Based on -5 °, the lower limit position of 95 °, the upper position of the lift range, 0 ° and the lower position of 91 °, the upper and lower positions of the lift range are set to the motor rotation positions. Therefore, even if the motion state detection signal Pf shows a relative value, feedback control during normal operation using the motion state detection signal Pf is accurately executed.

  In addition, since the upper position detection signal ULS and the lower position detection signal LLS are not used for calculating the set value, the position detector 15, the mounting position of the upper position detector 15 and the lower position detector 16 are For example, if fluctuations within ± 2 ° in the rocking angle occur due to sensitivity, positional deviation, etc., the fluctuation amount of −2 ° is set to −5 ° of the rising / lowering limit position. The upper position detector 15 is installed at a place where the arrival of the blocking rod 20 can be detected in a range including -7 ° added to 0 ° of the upper position of the lift range + 2 ° added with the fluctuation amount + 2 °. It is possible to detect the arrival of the blocking rod 20 in a range from 97 ° which includes the variation amount + 2 ° to the lower limit position 95 ° to 89 ° which includes the variation amount −2 ° to the lower position of the lifting range 91 °. Attach the lower position detector 16 to the place. In the adjustment of the mounting position is reliably eliminated.

[Others]
In the above embodiment, the adjustment of the upper limit stopper 17 and the lower limit stopper 18 was not mentioned. However, the upper limit stopper 17 and the lower limit stopper 18 only need to be mechanically fixed before performing the normal operation and the raising / lowering range setting. A combination with a fixed position adjusting means such as an adjusting screw is not denied (for example, see Patent Document 5).
In the above embodiment, the upper position detection signal ULS is checked to be turned on at the rising limit position of the lifting limit and the lower position detection signal LLS is checked to be turned on at the lowering limit position of the lifting limit. In addition, the upper position detection signal ULS is turned on at or near the upper position of the lifting range, and the lower position detection signal LLS is confirmed to be turned on at or near the lower position of the lifting range. good.
In the above embodiment, the upper position detector 15 of the upper position is provided in addition to the lower position detector 16 of the lower position as the position detector related to the lifting range. Since there are those without, the upper position detector 15 may be omitted. In that case, the program may be modified so that the upper position detection signal ULS is not checked (see step S22 in FIG. 2) for the automatic setting of the lifting range by the control unit 12.

In the above-described embodiment, the lifting / lowering speed or the like of the barrier rod is not mentioned, but the descent time and the ascending time may be set. Further, the jumping control during the lowering of the barrier rod and the unwinding control during the lifting may be performed.
Further, when the processing capacity of the control unit 12 has a surplus capacity, a failure detection or failure information may be externally transmitted so as to enable status monitoring at a monitoring center or the like.
Further, in the implementation, the controller 12 is required to be fail-safe, which can be achieved by a combination of known techniques.

10 ... Railroad crossing breaker,
DESCRIPTION OF SYMBOLS 11 ... Setting part, 12 ... Control part, 13 ... Drive part,
13a: Drive state detector (current transformer),
14 ... motor (electric motor), 14a ... motor spindle, 14b ... motion state detector (resolver),
15 ... Upper position detector (switch), 16 ... Lower position detector (switch),
17 ... Upper limit stopper, 18 ... Lower limit stopper,
19 ... Rotating spindle, 19a ... Deceleration transmission mechanism, 20 ... Shut off rod,
CR1 ... Lift command, Sm ... Motor control signal,
ULS ... upper position detection signal, LLS ... lower position detection signal,
Pf ... Motion state detection signal (rotation angle), If ... Drive state detection signal (drive current)

Claims (3)

  A motor that swings the shut-off rod in the up-and-down range, and a control unit that controls the rotational motion of the motor by detecting and feeding back a motion state in which the motor rotational position that is a relative rotational angle related to the main shaft of the motor is detected. An upper limit stopper for mechanically abutting the rising of the blocking rod at the rising limit position exceeding the upper position of the lifting range, and the blocking lever at the lower limit position exceeding the lower position of the lifting range. Lower limit stopper that stops the descent by mechanical contact, a lower position detector that detects that the blocking rod is at the lower position of the lifting range, and a driving state detection that detects the driving state of the motor A railroad crossing breaker equipped with a detector, rotating the motor to the upward side to detect that the upper limit position has been reached based on the detection result of the driving state detector and lowering the motor. The upper limit position and the lower position of the ascending / descending range are detected based on the detection result of the driving state detector and based on the motor rotation position at the time of both detections. A railroad crossing breaker characterized in that an elevation range automatic setting means for associating the motor rotation position is provided in the control unit.   The up-and-down range automatic setting means sets a motor rotation range extending between the motor rotation position corresponding to the rising limit position and the motor rotation position corresponding to the lowering limit position to a predetermined value related to the swinging of the blocking rod. 2. The railroad crossing breaker according to claim 1, wherein each of the upper position and the lower position of the lifting range is associated with the motor rotation position by allocating on the basis.   In the ascending / descending range automatic setting means, when the lower position of the ascending / descending range is associated with the motor rotation position, the lower position detector detects that the blocking bar is at the lower position. The railroad crossing breaker according to claim 1 or 2, characterized in that it is a necessary condition for completion of correspondence.

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