JPH0611162B2 - Closed switchboard display - Google Patents

Description

Detailed Description of the Invention [Industrial applications]

The present invention relates to a display device for a closed switchboard. More specifically, the present invention relates to a display device capable of easily confirming the state of contacts of a control unit of a closed switchboard from the outside.

[Prior art and its problems]

In a closed switchboard that has a structure that can set the contact of the control unit built in the unit room to each state of disconnection, inspection, and connection, it can be disconnected even when the unit door is closed. Even the unused control unit can be built in the unit room by disconnecting it. Therefore, it is convenient because it does not need to be removed one by one, but the following problems occur. In other words, in the closed switchboard having the above structure, the control units that are not needed may be mistakenly energized or the necessary control units may not be connected. In the former case, unnecessary electric power is supplied to the load side, which causes electric safety problems such as accidents and electric shock. In the latter case, the necessary equipment does not operate and the process of the controlled device does not function smoothly. In order to prevent them, it is necessary to confirm the state of the contact of the control unit in each unit room during operation. For displaying the state of the contactor, for example, Japanese Unexamined Patent Publication No.
The display devices disclosed in JP-A-4-71344 and JP-B-60-15373 can be mentioned. The display device of Japanese Patent Laid-Open No. 54-71344 has a structure in which the state of the contactor is confirmed by reading the scale of the display plate with a display needle that moves forward and backward with the same stroke as the contactor in conjunction with the movement of the contactor. . However, since this display device is provided inside the unit door, the state of the contact cannot be confirmed from the outside when the unit door is closed. Further, since the display device is located on the back side of the unit chamber, it is difficult to confirm the display even if the unit door is opened when the electric parts are mounted on the front side of the unit frame. The display device in Japanese Utility Model Publication No. 60-15373 has a structure in which the forward and backward movement of the unit frame is converted into a rotational movement of the indicator, and the state of the contactor is confirmed by the vertical movement position of the display plate surface at the tip of the indicator. . The display device having this structure is also inside the unit door, and like the above display device, when the unit door is closed, the state of the contact cannot be externally changed. Even when the unit door is open, it is difficult to confirm unless it is from the front. As described above, in the display device having the conventional structure, in order to know the state of the contactor, it is necessary to open the unit door and look into the inside of each unit room. Particularly, the unit room above the general closed switchboard is located at a high position, and it is necessary to use a stepladder to open / close the unit door and to see the inside of the unit room.

[Object of the Invention]

The present invention relates to a contact of a control unit built in a unit room in a closed switchboard in which a contact of a control unit built in the unit room can be set to each state of disconnection, inspection and connection even when the unit door is closed. It is an object of the present invention to provide a display device in which each state of a child can be easily confirmed from the outside.

[Constitution of the invention]

Means of the present invention taken to solve the above problems are as follows. That is, according to the present invention, the interlocking arm rotated by the operation of the operation handle advances and retracts the contactor mounting frame, and disconnects and inspects the contactor of the control unit built in the unit chamber with the unit door closed. A closed switchboard that can be set in each state of connection, and the closed switchboard is rotated by advancing and retracting the contact attachment frame, and a cam portion provided with a required number of positioning portions on the outer edge portion or the cam groove. A cam plate which is provided, a conversion means which is provided so as to be interposed between the contactor mounting frame and the cam plate, and which converts the advancing / retreating motion of the contactor mounting frame into a rotational movement of the cam plate, and a step at the tip. A display body that has an identifying portion that is provided in a fixed manner, the base end portion of which is in contact with the outer edge portion of the cam plate or is engaged with the cam groove, and which is moved forward and backward by the rotation of the cam plate; With a display hole at the position corresponding to the identification part of Comprising a door, a, in closed state of the unit door, the identification unit of the display body was to project from said display aperture, a display device of a closed switchboard. The structure of the cam plate is not particularly limited as long as the forward / backward movement of the display body can be controlled stepwise according to the forward / backward movement of the contactor mounting frame (state of the contactor), but the tip of the protruding display body does not interfere. It is advisable to adopt a structure in which the length of forward and backward movement can be reduced within a necessary and sufficient range. Further, in terms of certainty of readability, it is more preferable that the length of the forward / backward movement of each stage of the display body is constant regardless of the length of the forward / backward movement of the contactor attachment frame. The cam plate used is generally one having a cam surface at the outer edge portion, but a cam plate having a structure provided with a cam groove can also be used. The display body can be projected to the outside from a through hole formed in a part of the unit door. When the outside of the through hole is used as the reading point, the through hole should have a small diameter so that the display body can smoothly slide in and out in order to eliminate a reading error. Further, a dustproof member can be provided in the through hole. The structure of the identification portion of the display body is not particularly limited, and examples thereof include a structure in which a protruding portion is provided with a scale, or a structure in which color is gradually classified into strips. In addition, generally, as the state of the contact, the disconnection state,
There are three stages of inspection state and contact state, and the identification unit is usually provided in three stages corresponding to this, but not limited to this, for example, in two stages, the tip of the display body appears to the outside in the disconnection state. Instead, it is possible to adopt a structure in which the identification portion projects to the outside in the subsequent inspection state and contact state.

【Example】

The present invention will be described in more detail based on the preferred embodiments shown in the drawings. FIG. 1 is a plan view showing an outline of a unit room in which a display device is provided, FIG. 3 is a plan view of a display device portion, and FIG. 3 is a side view of the display device portion. The outline of the structure for advancing and retracting the contactor attachment frame 6 of the unit frame 1 shown in FIG. 1 will be described. On the unit frame 1, a contactor attachment frame 6 having a power contactor 7 and a load contactor 8 on the back surface is movable in the contact direction of both the contactors 7, 8 with respect to the unit frame 1, that is, the front-back direction. Is attached to. These contacts 7 and 8 are connected to the device governed by the unit frame 1. The power source contact 7 and the load contact 8 are provided on the board frame 5.
A bus bar 9 and a load-side terminal 10 connected to each other are provided. An L-shaped interlocking arm 16 that rotates around the interlocking arm circuit shaft 15 is attached to the unit frame 1. An operation rod 19 is provided at one end of the interlocking arm 16, and an elongated hole 16a is provided at the other end. The contactor attachment frame 6 is provided with a drive shaft 17 at a predetermined position. The drive shaft 17 is attached to the unit frame 1 by engaging the drive shaft 17 with the elongated hole 16a of the interlocking arm 16, and the contact arm attachment frame 6 is rotated by the rotation of the interlocking arm 16. It is a structure that moves forward and backward. The rotation of the interlocking arm 16 is
Although the operation handle 18 is attached to the operation rod 19, the operation handle 18 has a structure that can be removed only when the contactor attachment frame 6 reaches a predetermined position, and prevents an erroneous operation. . The display device 2 is provided on the slightly right side of the operation rod 19 in the connected state of the contacts 7 and 8. The display device 2 includes a cam plate 21. Cam plate 21
Has a cam portion 211 having a predetermined shape on the side of the center of rotation and a drive arm 212 on the end side. The cam plate 21 is rotatably attached to a predetermined position on the front side of the unit frame 1 by a pivot shaft 214. The cam surface of the cam portion 211 is composed of an arcuate positioning portion having the pivot 214 as the center, and a portion for gently connecting them. Each positioning portion from the pivot 214,
The distance to is appropriately set so that the rod-shaped display body 23, which will be described later, can be advanced and retracted stepwise for each operation and stopped. In this embodiment, the positioning portion,
The difference in the distance between the positioning portion and the positioning portion is the same, and the display body 23 has the same length of forward / backward movement so as to move forward / backward stepwise. The drive arm 212 of the cam plate 21 is provided with a long hole 213. A contactor attachment frame 6 is attached to the unit frame 1 so as to cover the cam plate 21. The contactor mounting frame 6 is provided with an escape groove 61 to allow the head of the pivot shaft 214 to escape so that the contactor mounting frame 6 can be smoothly moved back and forth. An engagement pin 62 is provided at a predetermined position on the back surface of the contactor attachment frame 6. Contact attachment frame 6
Is attached by engaging the engagement pin 62 with the long hole 213 of the cam plate 21, and when the contactor attachment frame 6 moves back and forth, the cam plate 21 moves in a certain range around the pivot 214. Rotate with. A display body 23 is attached to the unit frame 1 slightly forward of the cam plate 21 so as to be movable back and forth with a predetermined stroke. The display body 23 is a rod body having a predetermined length and a circular cross section. The front and rear walls of the bent portion 11 of the unit frame 1 have insertion holes 111,
112 is provided, and the display body 23 has the insertion hole 11
It is attached to the Nos. 1 and 112 so as to project forward and backward and to be slidable without rattling. A hemispherical contact portion 231 that contacts the cam surface is provided at the tip of the display body 23 on the cam plate 21 side. A fastener 232 is provided on the slightly front side of the contact portion 231.
The compression spring 233 is mounted between the fastener 232 and the peripheral portion of the insertion hole 111. As a result, the display body 23 is biased toward the cam plate 21, and the contact portion 231 is always in contact with the cam surface of the cam plate 21. Further, an identification portion 234 is provided on the other end portion of the display body 23 protruding from the bent portion 11 of the unit frame 1. The identification unit 234 is color-coded in a band-like manner in stages, “part is green indicating disconnection state,” part is yellow indicating inspection state,
The'part is colored red to indicate the connection state. On the unit door 3 of the unit room, the identification portion 2 of the display body 23 is provided.
The display hole 31 is provided at a position corresponding to 34, and the identification portion 234 of the display body 23 is in a state where the unit door is closed.
Protrude from the display hole 31. The outside of the display hole 31 serves as a reading point, and the states of the contacts 7 and 8 are discriminated by the color of each of ',', 'of the identification unit 234 related to the reading point.

[Work]

The state shown in FIG. 2 indicates that the contactor is in the disconnecting state. FIG. 4 is an explanatory diagram showing the positional relationship of the display device in the inspection state, and FIG. 5 is an explanatory diagram showing the positional relationship of the display device at the time of connection. The operation of this embodiment will be described with reference to the drawings. In the disconnection state, the cam plate 21 is in a state as shown in FIG. 2, and the abutting portion 231 of the display body 23 is the cam portion 211.
Is in contact with the positioning portion of. Display body 23 at this time
In the identification part 234, the green 'part is applied to the reading point of the display hole 31 of the unit door 3, so that it is determined that the contacts 7 and 8 are in the disconnected state. Next, the operation handle 18 is attached to the operation rod 19, the interlocking arm 16 is rotated, and the contactor attachment frame 6 is pushed into the inspection state. As a result, the cam plate 21 rotates clockwise in the drawing, and the position determining portion of the cam portion 211 contacts the contact portion 231 of the display body 23 in the inspection state. Along with this, the identification portion 234 of the display body 23 moves to the outside,
The yellow part is attached to the reading point of the display hole 31, and it is determined that the contacts 7 and 8 are in the inspection state. Further, the interlocking arm 16 is rotated to push the contactor attachment frame 6 and bring the contacts 7 and 8 into contact with each other. Cam plate 21
Further counterclockwise, and in the connected state, the positioning portion of the cam portion 211 contacts the contact portion 231 of the display body 23.
Along with this, the identification 234 of the display body 23 moves to the outside, the red 'portion is applied to the reading point of the display hole 31, and the contacts 7 and 8 are determined to be in the connected state. As described above, the respective states of the contacts 7 and 8 can be surely discriminated from the outside while the unit door 3 is closed, and it is not necessary to open the unit door 3 as in the conventional case. In addition, even in the unit room above the closed switchboard, the confirmation work can be performed accurately and quickly because the unit room can be easily identified from below. 6 to 9 are explanatory views showing another embodiment of the display device. FIG. 6 is a sectional view of an essential part in an empty unit state, FIG. 7 is a plan view of an essential part in a disconnected state, FIG. 8 is a plan view of an essential part in an inspection state, and FIG. 9 is a plan view of an essential part in a connected state. . The device according to the present embodiment is a display device having a dustproof structure and capable of discriminating the state of an empty unit. A cam plate 21 and a contactor attachment frame 6 (not shown in FIGS. 6 to 9) are attached to the unit frame 1 as in the above embodiment. The display body 23a attached to the bent portion 11 of the unit frame 1 has the front end portion on the outside of the insertion hole 112 when the contact portion 231 is in contact with the positioning portion of the cam plate 21 (the state shown in FIG. 7). It is set to be almost flush with. The unit door 3 is provided with an attachment hole 33 at a position corresponding to the display body 23a. A seal member 34 is attached to the attachment hole 33 via an O-ring 35. An insertion portion 341 is provided so as to penetrate the seal member 34. On the outer side of the insertion portion 341, a slightly large-diameter housing portion 342 and a further expanded opening portion 343 are continuously provided. The display body 23b is slidably attached to the insertion portion 341. The display body 23b is provided with a slightly larger diameter stop portion 235 accommodated in the accommodation portion 342 at the front end portion.
Further, an identification unit 236 is provided at the front end of the display body 23b. The identification unit 236 is color-coded stepwise in a strip shape. "Part (stop portion 235 part) is colored green indicating a disconnection state," part is yellow indicating an inspection state, and "part is colored red indicating a connection state. Further, an engaging portion 237 is fixed to the rear end portion of the display body 23b, and a compression spring 238 is attached between the engaging portion 237 and the inner wall portion of the unit door 3, Display 23
B is biased to the back side. The length of the display body 23b is determined when the engagement portion 237 and the front wall of the bent portion 11 of the unit frame 1 or the front end portion of the display body 23a come into contact with each other (when the unit door 3 is closed in the disconnection state: In FIG. 7), the stop portion 235 of the display body 23b is set to slightly project from the projecting end of the opening 343 of the seal member 34. The operation of this embodiment will be described with reference to FIGS. 6 to 9. In the state where the control unit is not built in the unit room, as shown in FIG.
5 is housed in the housing portion 342 of the seal member 34,
From the outside, the green part cannot be seen. This shows that the unit room is empty. When the control unit is inserted in the unit room, the cam plate 21 becomes as shown in FIG. The contact portion 231 of the display body 23a is in contact with the positioning portion of the cam portion 211. The outer end portion (lower end portion in the figure) of the display body 23a is the engagement portion 237 of the display body 23b.
Abutting the inner side end (upper end in the figure) of the display body 2
3b is a state in which the state of FIG. 6 is slightly pushed to the outside (downward in the figure). The identification portion 236 of the display body 23b at this time
Indicates that the green color "applies to the reading point at the edge of the opening 343 of the seal member 34 of the unit door 3, and the contacts 7 and 8 are in the disconnected state. 18 is mounted, the interlocking arm 16 is rotated, and the contactor attachment frame 6 is pushed in to enter the inspection state.The cam plate 21 is thereby rotated clockwise in the drawing to the state shown in FIG. In the state, the positioning portion of the cam portion 211 abuts on the abutting portion 231 of the display body 23a, and accordingly, the identification portion 236 of the display body 23b is pushed by the display body 23a and slides to the outside, The "yellow" portion is applied to the reading point on the edge of the opening 343, and it is determined that the contacts 7 and 8 are in the inspection state. Further, the interlocking arm 16 is rotated, and the contactor attachment frame 6 is pushed in to bring the contacts 7 and 8 into the connected state. Cam plate 21
Rotates clockwise to the state shown in FIG. In the connected state, the positioning portion of the cam portion 211 contacts the contact portion 231 of the display body 23a. Along with this, the identification portion 236 of the display body 23b slides to the outside, the red "part" is applied to the reading point of the edge of the opening 343, and it is determined that the contacts 7 and 8 are in the connected state. In this embodiment, the dustproof structure is provided in this manner to prevent dust from entering the unit chamber, and it is possible to determine the state in which the control unit is not placed in the unit chamber. The present invention is not limited to the embodiments, and various modifications can be made within the scope of the claims.

【The invention's effect】

The present invention has the above-mentioned configuration, and the disconnection, inspection, and connection states of the contactor of the control unit built in the unit chamber can be easily and quickly confirmed from the outside, and the control unit that is not necessary is energized by mistake. It is possible to prevent inconveniences such as an electrical safety problem and a necessary control unit not being connected.

[Brief description of drawings]

The drawings show an embodiment of the present invention, FIG. 1 is a plan view showing an outline of a unit room in which a display device is provided, FIG. 2 is a plan view of a display layer device, and FIG. 3 is a side view of the display layer device. 4 is an explanatory view showing the positional relationship of the display device in the inspection state, FIG. 5 is an explanatory view showing the positional relationship of the display device at the time of connection, and FIGS. 6 to 9 are other embodiments of the display device. FIG. 6 is a cross-sectional view of a main part in an empty unit state, FIG. 7 is a plan view of a main part in a disconnected state, FIG. 8 is a plan view of a main part in an inspection state, and FIG. 9 is a plan view of a main part in a connected state. It is a figure. 2: Display device 21: Cam plate 23: Display body ,: Positioning unit 234: Identification unit

Claims (4)

[Claims] 1. A control built in a unit chamber with a unit door closed by moving a contact mounting frame (6) forward and backward by an interlocking arm (16) which is rotated by operating an operating handle (18). A closed switchboard that allows the contacts of the unit to be set to disconnection, inspection, and connection states.This closed switchboard is rotated by the advancing / retreating of the contact take-off frame (6), and is not attached to the outer edge or cam groove. A cam plate (21) having a cam part (211) provided with a required number of positioning parts and a contact plate provided between the contact plate (6) and the cam plate (21). There is a conversion means for converting the forward / backward movement of the mounting frame (6) into the rotational movement of the cam plate (21), and the identification portion (234) provided in stages at the tip end, and the base end portion has the above-mentioned cam. A display body that is in contact with the outer edge portion of the plate (21) or is engaged with the cam groove, and moves back and forth by the rotation of the cam plate (21).
(23) and a display hole at a position corresponding to the identification part (234) of the display body (23).
A unit door (3) provided with (31), and in the state where the unit door (3) is closed,
The identification unit (234) of (23) is a display device of a closed switchboard, which is projected from the display hole (31). 2. A cam plate (2) which rotates about a pivot (214).
1) is provided with a required number of positioning portions and a drive arm (212) for driving the cam plate (21).
2) is provided with an elongated hole (213), and the contact attachment frame (6) is provided with an engaging pin (62) projecting from the engaging hole (213). ), And the contact pin mounting frame (6) is moved back and forth so that the engaging pin (62) becomes a long hole (21
3) It is designed to move inside, and the difference between the longest part and the shortest part of the distance from the pivot (214) to the outer edge of the cam plate (21) or the cam groove is the contact mounting It is formed to be shorter than the length of advance / retreat of the frame (6), and the length of advance / retreat of the display body (23) is reduced compared to the length of advance / retreat of the contactor mounting frame (6). A display device for a closed switchboard according to claim 1. 3. A cam plate (2) which rotates about a pivot (214).
1) has a required number of positioning portions that are gradually separated from the pivot axis (214), and the difference in the distance from the adjacent positioning portions to the pivot axis (214) is set to be substantially the same. (twenty three
The display device for a closed switchboard according to claim 1 or 2, wherein 4) is configured to move forward and backward stepwise with substantially the same length for each positioning portion. 4. The display device for a closed switchboard according to claim 1, 2 or 3, wherein a tip portion of the display body projects outside the unit door (3) through a dustproof member.