JPH0321131Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Industrial application field]

The present invention relates to a shutter drive device for a closed switchboard with a shutter device.

[Prior art]

Generally, in control centers, etc., a box-shaped panel frame is partitioned into multiple levels above and below by shelf boards to form multiple unit rooms, and units are stored in each of these unit rooms in a state where they can be pulled out. . This unit is a unit in which various control devices such as a molded circuit breaker, an electromagnetic contactor, an overload relay, and a control relay are mounted on a common frame to obtain predetermined control functions. When the unit is pulled out or inserted into the panel frame, the unit's main power circuit, load main circuit, and in some cases, control circuit are automatically disconnected or connected to the corresponding circuits of the bus bar, load side terminals, etc. of the panel frame. It is configured as follows. In such a unit, when inspecting the unit chamber with the unit pulled out, consideration must be given to prevent any part of the human body from accidentally coming into contact with the bus bar. That is, a shutter device that shields the exposed busbar is essential for safety. There are various types of drive means for this shutter device, such as one consisting of a guide groove and a drive pin that directly or indirectly drive the shutter. An example of an apparatus for directly driving the shutter is disclosed in Japanese Utility Model Application No. 57-74611, and an example of an apparatus for indirectly driving a shutter is the apparatus shown in FIGS. 3 to 5. 3 is a schematic plan view with a part of the unit omitted, FIG. 4 is a schematic front view with the unit omitted, and FIG. 5 is a schematic right side view with a part of the unit omitted. Incidentally, in FIGS. 3 and 4, the imaginary lines indicate the state in which the unit-side contactor and the board-side conductor are in contact. In Figures 3 to 5, reference numeral 1 denotes a unit that is housed in a closed switchboard so that it can be pulled out, and its movement along the pull-out direction brings the unit-side contactor and the panel-side conductor into contact with and away from each other. It is composed of Contactors 10, 10a, 10b, and 10c are attached to the unit 1 via a contactor mounting base 1a, and various devices such as a molded circuit breaker, an electromagnetic contactor, and an overload relay (not shown) are housed therein. There is. The switchboard has a vertical busbar 2 as a conductor on the panel side,
2a, 2b, 2c are provided, and the vertical busbars 2, 2
a, 2b, 2c are busbar covers 3, 3a, 3b, 3
It is surrounded by c to prevent dangers such as electric shock and short circuit accidents. Among the busbar covers 3, 3a, 3b, 3c, the contacts 10, 10a, 10b,
Square holes 4, 4a, 4b, 4c are provided at the joint with 10c.
is open, and the contacts 10, 10 of unit 1
a, 10b, 10c are square holes 4, 4a, 4b, 4c
It penetrates through and contacts the vertical busbars 2, 2a, 2b, and 2c. Square holes 4, 4 in busbar covers 3, 3a, 3b, 3c
Square holes 4, 4a, 4b, 4c on the a, 4b, 4c sides
A shielding plate 5 is provided to cover. Guide portions 6 formed by bending or the like are formed at both ends of the shielding plate 5, and engage with engaging portions formed at the ends of the generatrix covers 3, 3c on both sides, and slide in the direction along the generatrix, that is, in the vertical direction. It is possible and installed. A pin 7 is provided protruding from the unit 1 side of the shielding plate 5, and the pin 7 is slidably engaged in a sliding groove 9 formed at the tip of the rotating arm 8. The rotating arm 8 rotates about its base, and a sliding groove 9 formed at its tip is configured to push up the pin 7 while sliding it, thereby raising and lowering the shielding plate 5. A drive shaft 11 is attached to the base of the rotating arm 8 at a substantially right angle, and the drive shaft 11 is provided so that its axis is in the direction in which the unit 1 is pulled out. The drive shaft 11 is a bearing 3 provided on the base 50.
0 and 30a, and a guide groove 12 is formed in the drive shaft 11. The guide groove 12 has continuous parts, that is, a guide part 13 parallel to the axial direction, an oblique part 14 that intersects the axial direction at a predetermined angle, and a guide part 13 parallel to the axial direction in the circumferential direction. It consists of position holding parts 15 at different positions. A receiving opening 16 with a wide tip is formed at the end of the guide portion 13 so that the drive pin 20 and the guide groove 12 can easily engage when the unit 1 is inserted into the unit chamber. Note that the base 50 is generally also used as a shelf board. Reference numeral 17 denotes a rotation angle adjustment protrusion provided on the drive shaft 11, and a height-adjustable stopper 18 provided on the base 50 sets the range of rotation of the drive shaft 11, ensuring that the shielding plate 5 is Square hole 4, 4a, 4b,
I'm trying to put it in a position where I can block 4c. The unit 1 has a drive pin 20 on the lower surface, and the drive pin 20 engages with the guide groove 12 and slides within the guide groove 12 as the unit 1 is pulled out and inserted. The mounting position of the drive pin 20 is contact 1
0, 10a, 10b, and 10c are at the diagonal portion 14 of the guide groove 12 when they come out of the shielding plate 5.

[Problem that the invention attempts to solve]

In order to store the units 1 in each unit chamber in a drawable state, there must be a small gap between the unit chambers and the unit 1. For this reason, the position when storing unit 1 in each unit room is not constant,
Move left and right by the gap. If the position of the drive pin 20 and the position of the guide part 13 are misaligned and do not match, the drive pin 20 may not be aligned with the guide groove 1.
2. I am not guided smoothly. As a countermeasure against this, the receiving port 16 is formed as described above. If the weight of the unit 1 is light, there is no problem because the unit 1 moves in the direction to correct the misalignment. However, as mentioned above, since various control devices are attached to the unit, its total weight is quite heavy, and the unit 1 does not move in the direction to correct the misalignment, and moreover, The provided drive shaft 11 is fixed at a fixed position, and a drive pin 2 is provided on the movable side where the drive shaft 11 drives the shielding plate 5.
0 deviates, leave some margin in the movable range of the shielding plate 5, and move the drive shaft 11 within that margin.
can move and escape, but if the drive pin 20 shifts to the side opposite to the movable side of the drive shaft 11, the drive pin 20 will be pressed against the guide part 13 and will not escape, causing the drive pin 20 to bend. There is a problem.

[Means to solve the problem]

The present invention solves the above problems by housing the unit so that it can be pulled out, and by moving the unit in the direction of pull-out, the contact on the unit side and the conductor on the panel side are brought into contact with and separated from each other, so that when the unit is pulled out, It has a shielding plate that covers the joint part of the panel-side conductor with the unit-side contactor, and the shielding plate is driven by a drive shaft that is fixed to the base and has a guide groove formed along the direction in which the unit is pulled out. On the other hand, the unit has a shielding plate that engages with a guide groove formed on the drive shaft, and moves the shielding plate to both a closed position covering the joint portion and an open position where it is removed by moving the unit in the pulling direction and insertion direction. A drive pin is provided via the rotating shaft for positioning, and the driving pin is eccentric with respect to the rotating shaft,
This is a shutter drive device for a closed power distribution board with a shutter device, which can be rotated in the left and right directions about the rotation axis with respect to the pull-out direction and insertion direction of the unit.

【Example】

The present invention will be explained in more detail based on embodiments shown in the drawings. FIG. 1 is a perspective view showing the drive shaft and its surroundings;
FIG. 2a is a perspective view of the drive pin, and FIG. 2b is an explanatory diagram of the drive pin viewed from above, showing a state in which the drive pin 20 rotates eccentrically with respect to the rotation axis.
a, b, and c correspond to a, b, and c in FIG. 2a, respectively. A collar 206 is provided upright around the through hole provided in the unit 1. The collar 206 is provided with a through hole, through which the rotating shaft 21 of the drive pin 20 is inserted. A flange 202 that moves together with the rotating shaft 21 is connected to the rotating shaft 21, and a drive pin 2 that is eccentric to the rotating shaft 21 is attached to the flange 202.
0 is provided protrudingly. A retaining pin 204 is inserted through the upper end of the rotary shaft 21 so that both sides protrude from the rotary shaft 21 to prevent the drive pin 20 from slipping out. In addition, a stopper 205 is provided upright to restrict the range of rotation of the rotating shaft 21 by contacting the protrusion of the stop pin 204, so that the drive pin 20 can rotate within a range not exceeding 180 degrees on the drawer side of the unit 1. I have made it possible. 203 is a washer. The drive pin 20 engages with a guide groove 12 provided on the drive shaft 11 and slides within the guide groove 12 as the unit 1 is pulled out and inserted. a, b, and c in Fig. 2a are perspective views of the drive pin;
It shows a state in which it has been rotated around the rotation axis in sequence from a to b to c, and can be rotated within 180 degrees as shown by arrow A around state b. The drive pin 20 is
Since it is provided eccentrically with respect to the rotating shaft 21, it swings, and when the drive pin 20 is engaged with the guide groove 12, the play between the unit 1 and a guide (not shown) on which the unit 1 slides is prevented. By the amount of the gap, an escape is provided so that no load is applied to the drive pin 20 even if it moves from side to side, and the drive pin 20 is prevented from bending or breaking. Note that, as described above, the drive pin 20 is connected to the rotation shaft 2.
Unit 1 should be able to rotate within a range not exceeding 180 degrees on the drawer side of Unit 1.
When inserting the guide groove 1 in conjunction with the action of the receiving port,
2 to reduce the load on the drive pin 20, but the present invention is not limited thereto.

[Effect]

Next, the operation of this embodiment will be explained. Contacts 10, 10 shown by imaginary lines in Fig. 3
a, 10b, 10c and vertical generatrix 2, 2a, 2
In the case of pulling out the unit 1 which is in contact with the units 1 and 2c from the control center, the drive pin 20 on the lower surface of the unit 1 moves toward the oblique part 14 while sliding on the position holding part 15 in the guide groove 12. In this state, the shielding plate 5 remains elevated and is in the open position of the square holes 4, 4a, 4b, 4c. After the unit 1 is further pulled out and the drive pin 20 reaches the diagonal portion 14, the drive shaft 11 rotates clockwise in FIG. 4 as the unit 1 moves, and the rotation arm attached to the drive shaft 11 8 also rotates in the same direction to insert the shielding plate 5 into the square holes 4, 4.
Lower a, 4b, and 4c to the position where they will be shielded. Conversely, in the case of inserting the unit 1 into the unit chamber, the drive pin 20
A, 10b, 10c slide the guide part 13 toward the diagonal part 14 until they are just in front of the shielding plate 5, and after reaching the diagonal part 14, move the unit 1 and perform the above-mentioned movement in the pull-out direction. This is done in roughly the reverse order, pushing up the shielding plate 5 by rotating the drive shaft 11, exposing the square holes 4, 4a, 4b, 4c, and connecting the contacts 10, 10a, 10b, 10c to the square holes 4. , 4a, 4b, and 4c, respectively, to bring the contacts and the vertical generatrix into contact.

[Effect of the idea]

As explained above, the drive pin provided on the unit can be rotated by the required width in the left and right directions with respect to the pull-out and insertion directions of the unit, so that when the unit is inserted, the unit and the unit guide are Even if there is a gap due to left and right play,
The drive pin is not loaded due to its flexibility,
It can prevent bending or breaking. Moreover, since its flexibility is kept within the required range, it can operate smoothly and reliably.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing the drive shaft and its surroundings;
Figure 2a is a perspective view of the drive pin, Figure 2b is an explanatory diagram of the drive pin viewed from above, Figure 3 is a schematic plan view with a part of the unit omitted, and Figure 4 is a schematic front view with the unit omitted. FIG. 5 is a schematic right side view with a part of the unit omitted. 1: Unit, 10, 10a, 10b, 10
c: contactor, 5: shielding plate, 8: rotating arm, 1
1: Drive shaft, 20: Drive pin.

Claims (1)

[Claims for Utility Model Registration] The unit is housed so that it can be pulled out, and the contact on the unit side and the conductor on the panel side are brought into contact with and separated from each other by moving along the direction of the unit being pulled out, so that when the unit is pulled out, the conductor on the panel side The shield plate has a shield plate that covers the joint part with the unit side contactor, and the shield plate is driven by a drive shaft that is fixed to the base and has a guide groove formed along the direction in which the unit is pulled out; The unit is driven to engage with a guide groove formed on the drive shaft and move the shielding plate in both the closed position covering the joint portion and the open position in which the shielding plate is removed from the joint by movement of the unit in the pull-out direction and the insertion direction. A pin is provided via the rotation axis, the drive pin being eccentric with respect to the rotation axis,
A shutter drive device for a closed power distribution board with a shutter device, which is capable of rotating left and right about the rotation axis with respect to the pull-out direction and insertion direction of the unit.