JP5138015B2 - Misoperation prevention switch - Google Patents

Description

  The present invention relates to an erroneous operation prevention switch that prevents an erroneous operation of an electric circuit due to misidentification of the switch, and more particularly to an erroneous operation prevention switch that can reliably prevent an erroneous operation of an electric circuit using a tablet.

  A number of switchboards are installed in the switchboard room of the substation, and most switchboards are provided with switches of the same shape such as a power switch and a changeover switch. Workers engaged in work in substations are required to be careful so as not to misidentify the switch when operating the switch because the switch names are the same or similar on each switchboard.

  Therefore, in the substation, for example, a tablet for preventing an erroneous operation is employed for the operation of the circuit breaker for turning on and off the high voltage circuit. The tablet has a collation hole formed in a rectangular plate-shaped member. When operating the circuit breaker, the tablet corresponding to the circuit breaker to be operated is removed from the collation table located at another location, and then removed. Bring the tablet to the switchboard that contains the circuit breaker and attach the tablet to the switchboard to prevent erroneous operation.

  2. Description of the Related Art Conventionally, there has been known an operation switch that prevents an erroneous operation due to a switch misidentification (see, for example, Patent Document 1). The operation switch has a lock member that locks the rotation of the rotation shaft, and the lock member is moved by an electromagnet to engage and disengage the lock member.

JP 58-54523 A

  However, since conventional tablets have only a visual confirmation function, switch misoperation due to misidentification of the switch is continually eradicating various measures each time, but eradicating switch misoperation. The current situation has not yet reached. In other words, the purpose of the tablet is to be able to reliably recognize the switch to be operated and to prevent incorrect operation in any case. Then, there is a possibility that the collation act itself may be omitted, and when the use of the tablet violates the rule, there is a problem that the use of the tablet becomes ineffective against an erroneous operation.

  The operation switch of Patent Document 1 has an electrical interlock type structure using an electromagnet, and the circuit configuration becomes complicated, and there is a concern about the failure of electromagnetic energization due to deterioration over time, which is problematic in terms of reliability. Therefore, it is desired to develop a technique that reliably prevents erroneous operation of the switch with a simple configuration without using electric control.

  Therefore, an object of the present invention is to provide an erroneous operation prevention switch that can reliably prevent an erroneous operation of a switch with a simple configuration without using electric control.

In order to achieve the above-mentioned object, the invention according to claim 1 is provided with a switch main body portion for turning on and off an electric circuit, and the switch main body portion so as to be interlocked with the switch main body portion. A lock mechanism unit that allows the operation of the switch, and the lock mechanism unit has an operation lid that detachably holds the tablet and can be moved back and forth with respect to the switch main body. A collation protrusion that can be fitted into the collation hole of the tablet having the specific shape is provided, and the operation of the switch main body is permitted by the collation protrusion entering the collation hole by pressing the operation lid. This is an erroneous operation prevention switch .

According to a second aspect of the invention, the erroneous operation preventing switch according to claim 1, wherein the matching protrusion is characterized by being composed of a cylindrical matching pin extending in moving direction of the operation cover.

According to a third aspect of the present invention, in the erroneous operation prevention switch according to the first or second aspect , the tablet is provided with a switch display portion in which a name of a switch to be operated is specified. It is characterized by being.

According to a fourth aspect of the present invention, in the switch for preventing erroneous operation according to any one of the first to third aspects, the switch body portion is composed of a cam switch that simultaneously turns on and off a plurality of electric circuits. It is characterized by.

  According to the first aspect of the present invention, since the lock mechanism portion that allows the operation of the switch main body portion only by mounting the tablet having a specific shape is provided, the lock is released when a different tablet is mounted. Incorrect operation of the switch due to misrecognition can be reliably prevented. As a result, it is possible to prevent the occurrence of, for example, a failure in the transmission / distribution system due to an erroneous operation of the switch, and to improve the reliability of the transmission / distribution system. Moreover, since it is set as the structure which does not use electric control, a locking mechanism part can be simplified and the reliability of the misoperation prevention switch itself can be improved.

In addition , since the operation of the switch main body is permitted by the operation of pressing the operation lid so that the verification protrusion enters the verification hole, the lock mechanism can be unlocked only by the pressing operation. Unlocking can be performed.

According to the second aspect of the present invention, since the verification protrusion is constituted by the cylindrical verification pin extending in the advancing / retreating direction of the operation lid, the verification protrusion is made to have a polygonal cross-sectional shape or a complicated cross-sectional shape. In addition, the configuration of the lock mechanism can be simplified.

According to the invention described in claim 3 , since the tablet is provided with a display portion in which the name of the switch to be operated is clearly specified, even when there are a large number of switches, the switch can be easily compared with the tablet. It is possible to shorten the time for searching for a switch to be operated.

According to the invention described in claim 4 , since the cam switch is configured to simultaneously turn on / off a plurality of electric circuits, a large number of electric circuits can be turned on / off by a single switch operation.

It is sectional drawing which shows the locked state of the misoperation prevention switch concerning embodiment of this invention. It is sectional drawing which shows the lock release state of the misoperation prevention switch of FIG. It is a perspective view which shows the mounting procedure of the tablet to the cover part which comprises the lock mechanism part of the misoperation prevention switch of FIG. FIG. 4 is a perspective view illustrating an operation procedure of the erroneous operation prevention switch of FIG. 1, and FIGS. 4A to 4D are perspective views illustrating movement of an operation lid. It is a front view of the switchboard provided with the misoperation prevention switch of FIG. It is a side view which shows the modification of the misoperation prevention switch of FIG. It is a side view which shows another modification of the misoperation prevention switch of FIG. It is a front view which shows an example of the tablet with which the misoperation prevention switch of FIG. 1 is mounted | worn. It is a front view which shows another example of the tablet with which the misoperation prevention switch of FIG. 1 is mounted | worn.

  Next, embodiments of the present invention will be described in detail with reference to the drawings.

  1 to 9 show an embodiment of the present invention. As shown in FIG. 5, a switchboard 50 is installed on the floor surface FL of the switchboard room of the power substation. The switchboard 50 is composed of a first switchboard 50a and a second switchboard 50b. A plurality of erroneous operation prevention switches 1 are provided on the operation panels 51 of the first switchboard 50a and the second switchboard 50b.

  1 and 2 show details of the erroneous operation prevention switch 1. The erroneous operation prevention switch 1 includes a switch body 10 and a lock mechanism 20. The switch main body 10 has a function for turning on and off an electric circuit. In this embodiment, the switch body 10 is constituted by a cam switch for turning on and off a plurality of electric circuits at the same time. The cam switch has a plurality of cams and a plurality of electrical contacts, and a plurality of electrical circuits can be turned on and off simultaneously by rotation (twisting) of the rotation shaft 23a of the lock mechanism unit 20. Yes.

  The lock mechanism portion 20 includes a panel mounting portion 21, a holding hole 22, an operation knob 23, an operation lid 24, verification pins 25 a and 25 b, a locking rod 27, a spring 28, and a lock plate 30. The switch body 10 is attached to one end of the panel mounting portion 21 in the axial direction. The other end of the panel mounting portion 21 in the axial direction bulges outward in the radial direction. The operation panel 51 is formed with a through hole 51 a penetrating the operation panel 51 in the horizontal direction, and the other end in the axial direction of the panel mounting portion 21 is fixed to the operation panel 51. That is, a part of the switch body 10 and the panel mounting portion 21 is accommodated in the switchboard 50 through the through hole 51 a of the operation panel 51. Accordingly, the panel mounting portion 21 is configured such that only the other end portion bulging outward in the radial direction is exposed on the surface side of the operation panel 51.

  A holding hole 22 extending along the axis P is formed in the panel mounting portion 21. The operation knob 23 has a rotation shaft 23a extending in the axial direction. In the holding hole 22, a rotation shaft 23a of the operation knob 23 is rotatably held. The end of the rotating shaft 23a is connected to the switch main body 10, and by rotating the operation knob 23 about the axis P, the switch main body 10 is interlocked to turn on and off a plurality of electric circuits simultaneously. It can be done. The operation knob 23 is formed in a size that can be covered with the palm of the operator, and the outer peripheral surface of the operation knob 23 is provided with a slip stopper. Although the outer shape of the operation knob 23 in this embodiment is formed in a disc shape, the outer peripheral portion of the operation knob 23 is formed in a chrysanthemum shape or a corrugated shape so that the operation knob 23 can be easily turned by hand. It is desirable to form.

  As shown in FIG. 4, the operation knob 23 is formed with a fitting groove 23 g into which the operation lid 24 can be fitted. The fitting groove 23 g extends in a direction orthogonal to the axis P and opens on the surface side of the operation panel 51. Both sides of the fitting groove 23g of the operation knob 23 are formed on regulation walls 23f and 23e that can come into contact with the operation lid 24. The regulating walls 23f and 23e have a function of rotating the operation lid 24 around the axis P integrally with the operation knob 23. A rod housing hole 23 b extending along the axis P is formed in the rotation shaft 23 a of the operation knob 23.

  One of the rod housing holes 23b opens at the groove bottom of the fitting groove 23g of the operation knob 23. The other of the rod storage holes 23b extends to an intermediate portion of the rotation shaft 23a. The operation knob 23 is provided with collation pins 25 a and 25 b as collation protrusions extending in the advancing and retreating direction of the operation lid 24. Each of the verification pin 25a and the verification pin 25b is formed in a circular column shape having a circular cross section over the entire length. The verification pins 25a and 25b are set to diameters that can be fitted into the verification holes 26e and 26f of the tablet 26 with almost no gap.

  As shown in FIG. 4, the outer shape of the operation lid 24 is formed in a bowl shape. The operation lid 24 includes an upper surface portion 24a, a lower surface portion 24b, a left side surface portion 24c, a right side surface portion 24d, a tablet mounting portion 24e, and a slide shaft 24i. The tablet mounting portion 24 e is formed on the back side of the operation lid 24. The tablet mounting portion 24e is formed in a concave shape that opens upward, and includes holding grooves 24f and 24g that hold the tablet 26 from the left and right directions, and a holding bottom 24h that holds the tablet 26 from below. As a result, the operation lid 24 allows the tablet 26 to be taken in and out from the upper part of the tablet mounting portion 24e. Below the tablet mounting portion 24e of the operation lid 24, a slide shaft 24i that supports the operation lid 24 so as to be movable in the axial direction with respect to the operation knob 23 is provided. One side 24i1 of the slide shaft 24i is movably held on the slide hole 23c side of the operation knob 23. The other end 24 i 2 of the slide shaft 24 i is fixed to the operation lid 24.

  The tablet mounting portion 24e of the operation lid 24 is composed of a permanent magnet that can be attracted to the operation knob 23, and the axial end surface of the tablet mounting portion 24e can be attracted to the groove bottom of the fitting groove 23g of the operation knob 23. It has become. The adsorption force of the operation lid 24 to the operation knob 23 is set larger than the urging force of the spring 28. Thereby, the operation lid 24 is in a state of being fitted into the fitting groove 23g of the operation knob 23 except that the operation lid 24 is pulled out in the axial direction by an external force by the operator.

  FIG. 3 shows details of the tablet 26. In this embodiment, the tablet 26 means a portable collation plate for collating with the operation target switch when the switch is manually operated. The tablet 26 is made of a synthetic resin, and has, for example, a rectangular outer shape. The tablet 26 includes a front surface portion 26a, a back surface portion 26b, a right side surface portion 26c, a left side surface portion 26d, verification holes 26e and 26f, and a pressing rod 26g.

  The right side surface portion 26c of the tablet 26 can be fitted into the holding groove 24f of the tablet mounting portion 24e. The left side surface portion 26d of the tablet 26 can be fitted into the holding groove 24g of the tablet mounting portion 24e. The collation holes 26e and 26f are arranged at predetermined intervals in the vertical direction, and are constituted by through holes that penetrate the front surface portion 26a and the back surface portion 26b. The pressing rod 26g is provided on the back surface portion 26b and extends in the axial direction. On the upper surface of the tablet 26, a switch display portion 26h for clearly indicating the name of the switch to be operated is formed.

  In the rod storage hole 23b of the operation knob 23, a lock rod 27 arranged concentrically with the axis P is movably stored. One end of the locking rod 27 is provided with an engagement plate 27 a extending in a direction perpendicular to the axis P. The engagement plate 27a extends through the regulating hole 23d formed in the rotation shaft 23a of the operation knob 23 to the outside of the rotation shaft 23a. The movement of the locking rod 27 in the axial direction is restricted to a certain distance by contact between the engagement plate 27a and the inner surface of the restriction hole 23g. The locking rod 27 is urged in the axial direction by a spring 28 provided in the rod housing hole 23b. In a state where the engagement plate 27a and the inner surface of the restriction hole 23g are in contact with each other, the end surface of the locking rod 27 stops at substantially the same position as the groove bottom of the fitting groove 23g of the operation knob 23.

  A lock plate 30 is fixed to the back side of the operation panel 51 of the switchboard 50. The lock plate 30 includes a lock plate main body 30a and a fixed plate 30b. The fixed plate 30 b is fixed to the back side of the operation panel 51 of the switchboard 50. The lock plate main body 30 a extends from the fixed plate 30 b toward the lock rod 27. When the tablet 26 is not attached to the operation lid 24, the engagement plate 27a of the lock rod 27 is kept engaged with the lock plate main body 30a, and twisting around the axis P of the operation knob 23 is prevented. It is like that. When the tablet 26 is mounted on the operation lid 24 and the collation pins 25a and 25b enter the collation holes 26e and 26f by pressing the operation lid 24, the engagement plate 27a of the lock rod 27 is connected to the lock plate body 30a. Thus, the operation knob 23 can be twisted (rotated) about the axis P of the operation knob 23.

  In the substation, there is a need to immediately return the switch when an abnormality of the device is recognized at the time of operating the switch. In this embodiment, the structure in which the operation knob 23 can be immediately returned to the original position is provided. Adopted.

  Next, the operation procedure and operation of the erroneous operation prevention switch 1 will be described.

  As shown in FIG. 4A, in the operation error prevention switch 1, the operation knob 23 needs to be twisted (rotated) around the axis P in order to operate the switch body 10. When the tablet 26 is not attached to the operation lid 24, the erroneous operation prevention switch 1 has the lock plate body 30a and the engagement plate 27a engaged as shown in FIG. 1, and the operation knob 23 is twisted around the axis P. Can not do it. As shown in FIG. 4A, the operation lid 24 is in close contact with the operation knob 23 side by a tablet mounting portion 24e that is usually made of a permanent magnet.

  FIG. 4B shows a state in which the operation lid 24 is pulled out from the operation knob 23. As described above, the operation lid 24 is always in close contact with the operation knob 23 because the tablet mounting portion 24e is made of a permanent magnet. By pulling out in the direction of the arrow (b), the operation lid 24 can be pulled away from the operation knob 23. In this state, since the operation lid 24 is supported on the operation knob 23 side by the two slide shafts 24 i, the operation lid 24 does not fall off from the operation knob 23.

  FIG. 4C shows a state immediately before the tablet 26 is attached to the operation lid 24. The tablet 26 is stored in a place other than the switchboard room where the switchboard 50 is installed, for example. When the operation of a specific switch is required, the tablet 26 corresponding to the switch to be operated is selected from the collation table (not shown), the operator carries the selected tablet 26 and enters the switchboard room, and the switchboard 50 Will operate certain switches. Since the tablet 26 is provided with a display portion 26h describing the name of the switch, the operator attaches the tablet 26 to the operation lid 24 of the erroneous operation prevention switch 1.

  In FIG. 4C, as shown in FIG. 3, the tablet 26 is mounted on the tablet mounting portion 24 e with the surface portion 26 a facing the operation lid 24. Here, since the tablet mounting portion 24e has holding grooves 24f and 24g for holding the tablet 26 and a holding bottom 24h, the tablet 26 is supported from the left and right directions and from below, and tilts or falls. It is positioned accurately without any problems.

  FIG. 4D shows a state where the tablet 26 is attached to the operation lid 24. When the tablet 26 is attached to the operation lid 24, the operator presses the operation lid 24 toward the operation knob 23 as shown by an arrow in FIG. Here, when the position of the collation holes 26e and 26f of the tablet 26 and the position of the collation pins 25a and 25b on the operation knob 23 side do not match, the collation pins 25a and 25b interfere with the back surface portion 26b of the tablet 26, and the pressing rod The locking rod 27 cannot be pressed at 26 g. In this state, the engagement plate 27a of the lock rod 27 is kept engaged with the lock plate main body 30a, and the operation knob 23 cannot be twisted around the axis P.

  When the position of the collation holes 26e and 26f of the tablet 26 matches the position of the collation pins 25a and 25b on the operation knob 23 side with the tablet 26 mounted on the operation lid 24, the collation pins 25a and 25b are collated with the collation pin 25a. 25b, and the locking rod 27 can be pressed by the pressing rod 26g. 2, the engagement state (locked state) between the engagement plate 27a of the lock rod 27 and the lock plate body 30a can be released, and the operation knob 23 is twisted about the axis P. It becomes possible.

  Then, by twisting the operation knob 23 around the axis P, the switch main body portion 10 that is interlocked with the rotation shaft 23a of the operation knob 23 is operated, and a plurality of electric devices are operated by the switch main body portion 10 constituted by a cam switch. The circuit is turned on and off.

  As described above, since the lock mechanism unit 20 that allows the operation of the switch body unit 10 only by mounting the tablet 26 having a specific shape is provided, the lock mechanism unit 20 is unlocked when a different tablet 26 is mounted. Therefore, it is possible to reliably prevent erroneous operation of the switch. As a result, it is possible to prevent the occurrence of a failure in the power transmission / distribution system due to an erroneous operation of the switch, and to improve the reliability of the power transmission / distribution system. Moreover, since it is set as the structure which does not use electrical control, the lock mechanism part 20 can be simplified and the reliability of the misoperation prevention switch 1 itself can be improved.

  In addition, since the operation of the switch body 10 is permitted by the verification pins 25a and 25b entering the verification holes 26e and 26f by pressing the operation lid 24, the lock mechanism 20 is unlocked only by the pressing operation. Can be unlocked with a simple operation. Furthermore, since the collation protrusion is composed of columnar collation pins 25a and 25b extending in the advancing and retreating direction of the operation lid 24, the lock mechanism portion is more effective than the case where the collation protrusion has a polygonal sectional shape or a complicated sectional shape. The configuration of 20 can be simplified.

  Since the tablet 26 is provided with a display portion 26h that clearly indicates the name of the switch to be operated, even when there are a large number of switches, it is easy to collate the switch with the tablet 26, and time for searching for the switch to be operated is saved. It can be shortened.

  Since the switch body 10 is composed of a cam switch that turns on and off a plurality of electric circuits simultaneously, a large number of electric circuits can be turned on and off by a single switch operation. Thereby, it is not necessary to provide a large number of switches on the operation panel 51 of the switchboard 50, and the structure of the switchboard 50 can be simplified.

  In addition, when an abnormality of the apparatus is recognized during the switch operation, it is necessary to immediately perform the switch return operation. In this embodiment, the structure in which the operation knob 23 can be immediately returned to the original position is adopted. Therefore, it is possible to take a quick response to the abnormality of the apparatus. That is, as shown in FIG. 2, the switch return operation is performed in a state where the engagement plate 27a and the lock plate 30 are not engaged, so that the operation knob 23 can be instantaneously returned to the original position. Become.

  6 and 7 show a modification of FIG. 1, the lock plate 30 provided inside the switchboard 50 is used to lock the twist of the operation knob 23. However, as shown in FIG. 6, the lock hole formed in the operation panel 51 is used. The engagement plate 40 may be protruded to the front surface side of the operation panel 51 using 51b and the spring 41, and the engagement between the engagement plate 40 and the operation panel 51 may be released by an external force from the arrow F1 direction. In addition, as shown in FIG. 7, by engaging the engagement plate 42 with the spring 43 in the recess 51c formed in the operation panel 51 and swinging the engagement plate 42 by the external force from the arrow F2 direction, The engagement plate 42 may be disengaged from the operation panel 51.

  FIG. 8 shows a modification of the tablet 26. As shown in FIG. 8, the tablet 26 </ b> A is formed in a trapezoidal shape in which the lower base length W <b> 2 is shorter than the upper base length W <b> 1. In the tablet 26A, for example, the upper base length W1 is set to 20 mm, and the lower base length W2 is set to 18 mm. Further, the diameter d1 of the verification hole is set to 3 mm. In the tablet 26A configured as described above, when the verification holes are formed in, for example, four squares out of the ten squares shown in FIG. 8, 210 types of verification holes can be arranged, and there are 210 types of tablets. 26A can be used. In addition, when collation holes are formed in, for example, five of the ten squares, 252 collation holes can be arranged, and 252 types of tablets 26A can be used.

  FIG. 9 shows another modification of the tablet 26. As shown in FIG. 9, the tablet 26 </ b> B is formed in a rectangular shape having a horizontal length of W <b> 2 and a vertical length of H. In the tablet 26B, for example, the horizontal length W2 is set to 18 mm, and the length H in the height direction is set to 20 mm. Further, the diameter d2 of the verification hole is set to 2 mm. In the tablet 26B configured in this way, when, for example, three check holes are formed in the thirteen pieces shown in FIG. 9, 286 check holes can be arranged, and 286 types of tablets are provided. 26A can be used. Further, when collation holes are formed in, for example, four of the 13 squares, 715 collation holes can be arranged, and 715 types of tablets 26A can be used.

  The embodiment of the present invention has been described in detail above, but the specific configuration is not limited to the above-described embodiment, and even if there is a design change or the like without departing from the gist of the present invention, It is included in this invention. For example, in the embodiment, the pressing rod 26g is formed on the tablet 26, and the locking rod 27 is moved via the pressing rod 26g. However, the locking rod 27 protrudes from the operation knob 23 toward the operation lid 24. The locking rod 27 may be pressed directly with a tablet. By doing in this way, it becomes possible to press the lock rod 27 directly with a tablet, the existing tablet can be used as it is, and it becomes unnecessary to manufacture a new tablet.

  Further, although the verification pins 25a and 25b have been described as an example of the verification protrusion, the verification protrusion is not limited to the verification pins 25a and 25b, and the cross-sectional shape may be a polygon or a complicated cross-sectional shape. It may have a configuration. Furthermore, in the embodiment of the present invention, the case where the switch body 10 is applied to a cam switch as an example of the switch body 10 has been described. However, the switch body 10 is also applied to a push button switch that turns on and off an electric circuit by a pressing operation. Can do.

  Moreover, in this embodiment, although the case where the misoperation prevention switch 1 was applied to the switch of the switchboard 50 of a power transmission / distribution system was demonstrated, it is needless to say that it is applicable to electric circuits other than a power transmission / distribution system.

DESCRIPTION OF SYMBOLS 1 Misoperation prevention switch 10 Switch main-body part 20 Locking mechanism part 21 Panel mounting part 23 Operation knob 24 Operation lid 25a Verification pin (verification protrusion)
25b Verification pin (Verification protrusion)
26 Tablet 26e Collation hole 26f Collation hole 26h Display unit 27 Locking rod 30 Lock plate 50 Switchboard 51 Operation panel

Claims (4)

A switch body for turning on and off the electrical circuit;
A lock mechanism that is provided so as to be interlocked with the switch body, and that allows the switch body to be operated only by mounting a tablet of a specific shape,
The lock mechanism unit has an operation lid that can be detachably held and can move forward and backward with respect to the switch body, and the operation lid can be fitted with a collation hole of the tablet of the specific shape. A misoperation prevention switch, characterized in that a collation protrusion is provided, and the operation of the switch main body is permitted when the collation protrusion enters the collation hole by pressing the operation lid. The misoperation prevention switch according to claim 1 , wherein the collation protrusion is configured by a columnar collation pin extending in a forward / backward direction of the operation lid. The tablet, error prevention switch according to any one of claims 1 or 2, characterized in that the switch display section name of the switch to be operated is specified is provided. The erroneous operation prevention switch according to any one of claims 1 to 3 , wherein the switch main body portion is constituted by a cam switch that simultaneously turns on and off a plurality of electric circuits.

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