JP2992618B2 - Electric point machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to an electric pointing machine, and in particular, a technique for shortening a tong rail switching time from turning on of a motor power to displaying completion of lock. About.

<Conventional Technology> A switching operation in a conventional electric switch will be described with reference to FIG.

First, when changing from the locked state of the tongue rail to the opposite side, the rotation of the motor upon power-on is reduced by the reduction gear mechanism, and the conversion roller 1 provided on the conversion gear at the final stage of the reduction gear mechanism is rotated. . The conversion roller 1 rotates along the cam surface 2A of the cam bar 2 and moves to the escape portion 2B. During this period, only the conversion roller 1 moves and the cam bar 2 does not stroke. When the conversion roller 1 further rotates, the cam surface 2C is drawn with the center of the arc different from that of the cam surface 2A, and the cam bar 2 is pushed downward with the rotation of the conversion roller 1 so that the cam bar 2 is drawn. Move down and down
The lock piece 3 provided on the cam bar 2 also moves downward, disengaging from the operation rod 4 and unlocking the operation rod 4.
At this time, the projection 3a of the lock piece 3 is
The lock rod 7 is unlocked through one of the notches, and the tongue rail can be changed.

Thereafter, the rotation of the conversion roller 1 causes the conversion roller 1 to engage with the cam surface 4A of the operation rod 4, and the operation rod 4 linearly moves rightward in the figure with the rotation of the conversion roller 1. Thereby, the tongue rail (not shown) connected to the operation rod 4 starts to change. The conversion roller 1 is the cam surface 5C of the other cam bar 5
To the escape portion 5B, and the switching operation of the operating rod 4 ends. Further, when the conversion roller 1 rotates, the cam bar 5 and the lock piece 6 move upward integrally with the rotation of the conversion roller 1 so that the lock piece 6 is engaged with the operation rod 4 and the operation rod 4 is locked. I do. At this time, the protrusion 6a of the lock piece 6 is engaged with the notch of the lock rod 7, thereby fixing the lock rod 7 and locking the tongue rail to the switching position. The circuit controller (not shown) is operated by the movement of the lock piece 6 in synchronization with the end of the locking of the operation rod 4, the power of the motor is automatically turned off, the completion of the lock is displayed, and the conversion operation is completed. The motor power is turned off when the cam surface 5A enters the cam surface 5A from the escape portion 5B of the cam bar 5, and the conversion roller 1 moves along the cam surface 5A of the cam bar 5 by inertia and stops at an appropriate position.

<Problems to be Solved by the Invention> By the way, in the switching operation, at the time of unlocking, it is necessary to move the cam bar to unlock the operation rod by the lock piece and then move the operation rod.

That is, when the rotation center of the conversion roller 1 is set to the point O in FIG.
When passing through the point P passing through 4B and entering the cam surface 4A, that is, the angle α at the time when the operating rod 4 starts a stroke, the sixth angle
In the figure, when the conversion roller 1 passes through the point Q which enters the cam surface 2C from the cam surface 2A of the cam bar 2 through the escape portion 2B, that is, the lock piece 3 unlocks the operation rod 4 via the cam bar 2. The relationship with the angle β at the end is α
≤ β. In order to eliminate the waste of the conversion process, it is desirable that the difference between α and β is as small as possible, and it is desirable that the operation rod 4 moves at the same time as the lock is released, that is, α = β.

However, in the conventional conversion mechanism, the rotation radius r of the conversion roller such that α = β is uniquely determined by each stroke amount of the operation rod and the cam bar, and there is no design freedom.

Further, in the conventional conversion mechanism, the chain of the operating rod 4 is locked by the lock piece from the time when the operation of the operating rod 4 is completed (the point at which the operating rod 4 passes through the cam surface 4A in FIG. 5 and enters the escape part 4B). The amount of movement of the conversion roller until the lock is completed (the time when the vehicle passes the point S in FIG. 6) is γ-α. Among these, the cam bar 2 actually starts moving.
This is from the time when the transfer roller reaches the escape portion 2B of the cam bar 2 (point T in FIG. 6), and is point P (Q when α = β).
The movement from the point (equivalent to the point) to the point T (rotation angle x) is a useless movement. Similarly, in the unlocking operation, the rotation of the conversion roller wastes (the rotation angle y). Therefore, in the conventional conversion mechanism, there is a problem that such a useless rotation area of the conversion roller is inevitably generated, and the conversion time is correspondingly increased.

Further, although the motor power is turned off when the lock is completed, conventionally, the conversion roller coasts as it is. For this reason, there is a risk that the cam bar may collide with the stopper portion (end portion of the cam surface) and rotate in the opposite direction by repulsion to unlock the cam bar. (Point S in the figure)
It was necessary to increase the distance from the contact point to the collision position (the rotation angle of the conversion roller) to some extent. However, the amount of reversal of the conversion roller changes depending on the temperature and the like. When the temperature is low, the viscosity of the lubricant in the rotating shaft becomes higher than when the temperature is high, so the reversal amount is small, and the conversion roller stops near the collision position. . When the conversion operation is started from this state, there is a problem that the rotation angle of the conversion roller from the start of the conversion to the start of the unlocking increases, and the conversion time becomes longer.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an electric switching machine that eliminates a useless rotation area of a conversion roller and shortens a conversion time.

<Means for Solving the Problems> For this reason, the present invention relates to an electric pointing machine configured to convert a tongue rail by reciprocating linearly using a motor to move an operating rod connected to the tongue rail, A rotating mechanism for rotating the operating rod by reciprocating and linearly moving the operating rod by engaging with the operating rod, a cam plate having a cam surface having a predetermined shape and rotating in conjunction with the rotating operation of the rotating mechanism; And always reciprocate linearly in a direction perpendicular to the operation rod in response to the cam surface shape in different rotation angle ranges of the cam plate, and the movement of the operation rod and the lock rod after the tongue rail conversion is completed. A braking force is generated in synchronism with energization cutoff for the pair of lock members for locking the motor and the motor whose energization is cut off when the pair of lock members lock the movement of the operation rod and the locking rod. And braking means to be used.

<Operation> According to this configuration, the operation rod is moved by the rotation mechanism (a conversion roller or the like), and the movement of the lock member that locks the operation rod is performed by a cam plate different from the rotation mechanism. The region and the operation region of the lock member can be set independently of each other without any restrictions.

In addition, since the braking means applies a braking force to the motor by the braking means in synchronization with the interruption of the power supply to the motor, the moving distance (rotation angle) of the conversion roller from the lock completion position to the stop position can be reduced, and the next conversion can be performed. The time from start to unlocking can be shortened, and the conversion time can be shortened.

<Example> An example of the present invention will be described below with reference to the drawings.

In FIG. 1 showing the configuration of this embodiment, a conversion roller 11 corresponding to a rotation mechanism is fixed to the cam plate 12 at a position eccentric from the rotation center A of the cam plate 12, and a driving circuit shown in FIG. The motor 31 is rotated via a reduction gear mechanism, a conversion gear, and the cam plate 12 by a motor 31 which is driven and controlled. The operating rod 13 connected to the tongue rail is formed with a cam surface 13A and an escape portion 13B with which the conversion roller 11 is engaged, and the operating rod 13 is reciprocated linearly with the rotation of the conversion roller 11 as in the related art. I do.

Rollers 16 and 17 are rotatably provided on lock pieces 14 and 15 as a pair of lock members that reciprocate linearly in a direction perpendicular to the operating rod 13. The rollers 16,
17 is formed on the cam plate 12 via the lock pieces 14 and 15 by the springs 19 and 20 interposed between the lock pieces 14 and 15 and the fixing portion 18 of the point machine body. It is always in pressure contact with the cam surface 12A having a predetermined shape.

The lock pieces 14 and 15 are formed with projections 14a and 15a which engage with the lock rod 21 when the tongue rail is locked as in the conventional case.

Next, the drive circuit for the motor and brake shown in FIG. 2 will be shown and described.

In the motor drive circuit, a lock piece is provided between the aforementioned forward / reversely rotatable motor 31 for tong rail conversion and a conversion command switch WR having two switching contacts of a localization side N contact and a reverse side R contact. The NC contact and the RC contact of the circuit controller 32 driven by 14 and 15 are connected.

Further, in the drive circuit of the brake 33 as a braking means for applying a braking force to the motor 31 at the same time as the completion of the lock, between the brake 33 and the switch WR for the conversion command.
The R contact and the N contact of the circuit controller 32 are connected.

Next, the operation of the switch according to the present embodiment will be described by taking as an example a case where the state of FIG. 1 is changed from the localization side to the opposite side assuming that the tongue rail is changed to the localization side.

In the state before the start of conversion shown in FIG.
WR is connected to the N contact side. In addition, the circuit controller 32
The NC contact and the N contact are in the ON state, the RC contact and the R contact are in the OFF state, the power to the motor 31 is cut off, the brake 33 is energized, and the conversion roller 11 is in the braking state (see the time chart in FIG. 3). ).

When the conversion command switch WR is switched to the R-contact side by the conversion command from this state to the opposite side, the R-contact is in the OFF state, the power supply to the brake 33 is cut off, and the braking force is released. The contact is in the ON state, the motor 31 is energized, and the conversion roller 11 starts rotating. Immediately after the start of rotation, the changeover roller 11 moves along the escape portion 13B of the operation rod 13, so that the operation rod 13 does not move. On the other hand, the cam plate 12 starts rotating at the same time as the conversion roller 11, and the cam surface 12A
In response to the shape, the lock piece 14 moves downward in the figure against the elastic force of the spring 19 via the roller 16.

Then, the conversion roller 11 is moved to the escape portion 13B of the operating rod 13.
When the lock piece 14 enters the cam surface 13A through
The lock piece 14 moves in response to the cam surface 12A of the cam plate 12 so that the lock is completed by releasing the engagement with the operating rod 13. While the lock of the operation rod 13 by the lock piece 14 is unlocked, the N-contact of the circuit controller 32 is turned off and the operation rod 12
Is displayed, and the RC contact turns ON. Thereafter, the conversion roller 11 engages with the cam surface 13A of the operation rod 13, and the operation rod 13 moves rightward in the drawing with the rotation of the conversion roller 11, thereby converting the tong rail to the opposite side.

When the conversion roller 11 rotates and passes through the cam surface 13A of the operation rod 13 and enters the escape portion 13B, the tongue rail is changed to the opposite side, and the stroke of the operation rod 13 ends. At this point, the locking operation of the operation rod 13 by the lock piece 15 is started. That is, in response to the cam surface 12A of the cam plate 12 rotating integrally with the conversion roller 11, the lock piece 15 starts moving upward in the drawing by the elastic force of the spring 20, and the operating rod 13
Is engaged with the lock piece 15 to lock the operation rod 13.

At the same time when the lock of the operation rod 13 is completed, the NC contact of the circuit controller 32 is turned off by the lock piece 15 and the energization of the motor 31 is cut off, and the motor 31 is stopped.
When the R contact is turned ON, the current supply to the brake 33 is started, and a braking force is applied to the conversion roller 11 to forcibly stop the rotation of the conversion roller 11. When the R contact is turned on, the lock of the operation rod 13 is displayed, and the switching operation of the tongue rail to the opposite side is completed.

In this manner, the stroke operation of the operation rod 13 and the lock pieces 14 and 15 is performed separately by the conversion roller 11 and the cam plate 12, and the start time and operation time of unlocking and locking of the operation rod 13 are performed. Can be freely set by changing the shape of the cam surface 12A of the cam plate 12 irrespective of the rotation mechanism of the conversion roller 11, so that the useless rotation area of the conversion roller can be eliminated. In addition, since the conversion roller 11 is forcibly braked at the same time as the completion of the lock, the coasting distance of the conversion roller 11 after the power supply to the motor is stopped can be reduced as compared with the conventional case, and the lock piece is unlocked from the start of the conversion at the time of conversion. The time until the operation starts can be shortened. Therefore,
The conversion time can be greatly reduced as compared with conventional point machines.

<Effects of the Invention> As described above, according to the present invention, the start time and operating time of the stroke of the lock member can be freely set by changing the cam surface shape of the cam plate regardless of the rotation of the conversion roller. As a result, there is no useless movement of the conversion roller, and the conversion time can be reduced.

In addition, since the motor is forcibly stopped at the same time as the completion of the lock, the coasting operation of the conversion roller can be suppressed, and the time from the start of conversion to the start of unlocking can be shortened.
The conversion time can be further shortened.

[Brief description of the drawings]

FIG. 1 is a simplified configuration diagram showing a conversion mechanism according to an embodiment of the present invention, FIG. 2 is a drive circuit diagram of a motor and a brake of the embodiment, FIG. 3 is an operation time chart of the motor and a brake, FIG. FIG. 5 is a simplified structural view showing a conventional switching mechanism of a switching machine, and FIGS. 5 and 6 are views for explaining the drawbacks of the conventional switching mechanism. 11 ... conversion roller, 12 ... cam plate, 12A ... cam surface, 13
…… Moving rod, 13A …… Cam surface, 13B …… Escape part, 1
4,15 …… Lock piece, 14a, 15a …… Protrusion, 16,17 ……
Roller, 19, 20… Spring, 21… Lock rod, 31…
Motor, 32 Circuit controller, 33 Brake

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kanzo Seki 2-29, Heian-cho, Tsurumi-ku, Yokohama-shi, Kanagawa Prefecture 1 within Keisan Seisakusho Co., Ltd. 2-29, Heian-cho 1 Kyosan Seisakusho Co., Ltd. (72) Inventor Koshiro Iino 1579-2 Kumagaya, Kumagaya-shi, Saitama Prefecture (56) References JP-A-60-121172 (JP, A) JP-A-60-93032 (JP, U) JP-A-2-82666 (JP, U) (58) Fields investigated (Int. Cl. ⁶⁾ , DB name) B61L 5/00-5/10 E01B 7/00

Claims (1)

(57) [Claims] 1. An electric pivoting machine configured to convert a tongue rail by reciprocating and linearly moving an operating rod connected to a tongue rail using a motor, wherein the electric rod is rotated by the motor and engaged with the operating rod. A rotating mechanism for linearly moving the operating rod back and forth, a cam plate having a cam surface of a predetermined shape while rotating in conjunction with the rotating operation of the rotating mechanism,
The cam plate is constantly pressed against the cam surface and reciprocates linearly in a direction perpendicular to the operation rod in response to the cam surface shape in different rotation angle ranges of the cam plate. A pair of locking members for locking the movement of the rods, and a braking force synchronized with the interruption of the power supply to the motor, the power supply of which is cut off when the pair of lock members locks the movements of the operation rod and the locking rod. An electric point machine comprising a braking means for acting on the electric point.