JPH0112484Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a high-voltage closed switchboard used in factories and the like, and particularly relates to a pull-out mechanism for pulling out and pushing in main circuit equipment housed within the panel.

Generally, main circuit equipment inside a high-voltage closed switchboard (mainly composed of power switchgear such as circuit breakers and high-voltage magnetic contactors, hereinafter simply referred to as equipment)
The drawer type is widely used for storage because it allows easy maintenance and inspection of the equipment and allows for a disconnection mechanism to be provided between the bus bar and the equipment. FIG. 1 is a schematic diagram showing the structure of a conventional closed switchboard of this type. In this figure, 1... is a three-phase main bus bar that runs horizontally through the switchboard, 2a..., 2b... are branch bus bars, and branch bus bars 2a..., 2b... are supported by insulating members 3, 3, respectively. The input side (power supply side) disconnection section contacts 6, 6 of the appliances 5, 5 are connected via the disconnection section conductors 4, 4 which are
and each output side (load side) disconnect contact 7,7 of the appliances 5,5 is respectively connected to a cable 8,8 extending to the load via the disconnect conductor 4,4, respectively. In addition, the appliances 5, 5 have four wheels 1
5, 15, . . . and are movable horizontally within storage chambers 16, 16 formed by grounded metal partition walls. Further, reference numerals 18 and 18 are front doors.

In such a configuration, when performing maintenance and inspection work on the appliance 5, open the power switchgear (breaker) of the appliance 5, disconnect the power supply side and the load side, and then disconnect the appliance 5 as shown in the figure. By pulling it out from the position shown to the position shown by the one-dot chain line, the disconnection section conductors 4, 4 and the disconnection section contacts 6, 7 are brought into a disconnected state. Then, after completely disconnecting the appliance 5 from the main bus 1, maintenance and inspection work for the appliance 5 is performed. The position where the instrument 5 is completely pushed in as shown in the figure is called the connection position, and when it is pulled out from this position, the disconnection section is disconnected and the control line between the external control means and the instrument 5 is disconnected. The position where only one of the terminals is connected (the position indicated by the dashed line in the figure) is called the test position. This test position is a position where the device 5 can be disconnected from the main bus bar 1 while remaining in the panel, and an operation test of the device 5 can be performed. Furthermore, when pulled out, the connection with the control means is also severed. This position is called the disconnection position, but both the test and disconnection positions are generally used in common.

By the way, it is very dangerous for the operator to directly perform the pull-out and push-in operations of the instrument 5 as described above, since there is a risk of contact with a high-pressure part. Therefore, it is conceivable to provide a pull-out mechanism that allows the device 5 to be pulled out and pushed in from the outside while the door 18 is closed. In order to ensure that the device 5 can be pulled out and pushed in smoothly,
A pull-out mechanism configured to pull out or push in both left and right ends of the instrument 5 at the same time may be provided. However, such a pull-out mechanism is large and has a complicated structure, which has become a problem as high-voltage closed switchboards are becoming smaller and lighter.

In view of the above-mentioned circumstances, this invention provides a pull-out mechanism for main circuit equipment that can be operated smoothly and has a small and simple structure. ,
disposed near the opening into which the operating lever is inserted and the opening inside the high-voltage closed switchboard;
a rotatable lever into which the operating lever is inserted; a transmission mechanism that converts the rotational movement of the lever into a linear movement in the front-rear direction and transmits it to the side of the main circuit device; and a roller that is rotatably attached to the main circuit device and prevents movement of the main circuit device in the width direction by coming into contact with the rails. There is.

Hereinafter, embodiments of this invention will be described with reference to the drawings. FIGS. 2A, 2B, and 2C are a front view, a side view, and a plan view showing the configuration of a board provided with a drawer mechanism according to an embodiment of the present invention. In these figures, 20a to 20i are all frames having an L-shaped cross section, and constitute the framework of the board. In this case, frames 20a to 20d are assembled horizontally in a mouth shape to constitute a bottom framework, frames 20e to 20g are assembled together with frame 20a in a mouth shape to constitute a front framework, and frames 20h and 20i are assembled in a mouth shape, respectively. It is vertically installed on the frame 20c and constitutes a rear framework.
Support members 22, 22 are attached to the upper and lower ends of the frame 20e on the left side of the front framework, respectively.
The left end portion of the door 18 is attached to these support members 22, 22 via shafts 21, 21, so that the door 18 can be opened and closed. A handle 23 is attached to the front right end of the door 18, and an opening 18a is formed below the handle 23. A cover 24 for opening and closing the opening 18a is attached by a hinge 25, and a dial fastener 26 is attached to the cover 24. This dial fastener 26 is used as a handle when opening and closing the cover 24, and also has the function of locking the cover 24 in the closed state. Further, a plate 27 is attached between the frames 20h and 20i of the rear framework, and six disconnection section conductors 4 are attached to this plate 27 through insulating members 3, respectively. Also,
Rails 28 and 29 each having a U-shaped cross section are attached between the frames 20a and 20c of the bottom frame in parallel and with their openings facing each other.
Reinforcement plates 30 and 31 are attached between the front ends and between the rear ends of 8 and 29, respectively. The instrument 5 is movably disposed between the rails 28 and 29, and a pull-out mechanism 4 for pulling out and pushing the instrument 5 into the rail 28 is provided.
0 is attached. The top, bottom, left and right sides of this panel are closed by grounded metal partition walls, and the rear side is connected to the busbar chamber.

Next, the structure of the drawer mechanism 40 will be explained with reference to FIGS. 3A and 3B. In these figures, a rectangular plate-shaped base 41 is horizontally attached by welding to the right side (outer side) of the front end portion (left end in FIG. 3B) of the rail 28. As shown in FIG. 4, a trapezoidal support plate 42 and a rectangular support plate 43 are each attached vertically and parallel to the rail 28 by welding to the upper surface of the base 41. Circular holes 42a and 43a are formed in the upper ends of the support plates 42 and 43, respectively.
Both ends of the pin 45 are rotatably supported by a and 43a. The pin 45 has a cylindrical member 46
is fitted, and this cylindrical member 46 connects a trapezoidal plate-shaped first link 47 and this first link 47.
A lever 48 attached by welding is rotatably supported. In this case, the first link 47 and the lever 48 are welded together such that the round hole 47a formed at the lower end of the first link 47 and the round hole 48a formed at the base end of the lever 48 overlap each other. The round holes 47a and 48a are supported by the cylindrical member 46. Further, the rotation range of the first link 47 is defined by bolts 41a and 41b (see FIG. 3B) vertically provided on the base 41. The front end of a long plate-shaped second link 52 is rotatably attached to the upper end of the first link 47 with a pin 51, and a round bar 53 is attached to the rear end of the second link 52. The front end is attached by welding. As shown in FIG. 5, a male threaded portion 53a is formed at the rear end of this round bar 53, and the male threaded portion 53a is connected to a nut 56 disposed on the front end surface of a prismatic third link 55. It is screwed into a female screw portion 55a formed by opening the front end surface. The distance between the second link 52 and the third link 55 can be adjusted by adjusting the screwing degree of the male screw portion 53a into the female screw portion 55a. Third
The rear end of the link 55 is rotatably attached to the approximate center of the rack cam 57 by a pin 58. This rack cam 57 is composed of a substantially U-shaped plate, and its lower end is connected to a shaft 61 attached between the right side of the rail 28 and a plate 60 fixed to this right side. It is rotatably supported. Recessed portion 57 at the top of the rack cam 57
A cylindrical cam follower 63 is slidably fitted into a, and this cam follower 63 is rotatably attached to a rectangular plate-shaped cam follower support 64 fixed to the right side of the instrument 5.

On the other hand, the tip of the lever 48 mentioned above has an opening 18a of the door 18 from the outside as shown in FIG.
The operating lever 70 inserted into is inserted. This operating lever 70 has a handle 70a and a joint part 70b which is attached to the tip of the handle 70a and has a substantially letter-shaped cross section.
and a lever pin 70c vertically disposed on the right side of the joint 70b, and the joint 70b is inserted into the tip of the lever 48. In this case, a stopper pin 48c is provided vertically on the right side of the lever 48, and the joint portion 70b is inserted until it comes into contact with the stopper pin 48c.

When the operating lever 70 is inserted to the position indicated by the two-dot chain line A shown in the figure and pushed down in the direction of the arrow B, the lever 48 is rotated in the direction of the arrow C to the position indicated by the two-dot chain line D. Link 47 rotates in the direction of arrow E. Furthermore, the second link 52, the round bar 53, and the third link 55 move in the direction of arrow F, and in conjunction with this, the rack cam 57 rotates in the direction of arrow G to the position indicated by the two-dot chain line H. As a result, the instrument 5 is pulled out in the direction of arrow I. In other words, the first link 47, pin 51, second link 52, round bar 53, third link 55, rack cam 57, etc.
It constitutes a transmission mechanism that converts the rotational movement of the lever 48 into a linear movement in the front-rear direction and transmits it to the side of the main circuit device 5.

Next, the reference numeral 72 in the figure is a regulating member that regulates the opening and closing of the door 18 and the removal of the operating lever 70 during the push-down and push-up operations. It is attached to the back side of the door 18 so as to be located on the side. This regulating member 72 includes a rectangular board 72a attached perpendicularly to the door 18, and a rectangular plate-shaped locking part 72b and 7 vertically installed on the left side of the board 72a.
2c. This locking portion 72b is provided vertically along a line extending obliquely upward from the center in the vertical direction of the front edge of the left side surface of the board 72a.
Further, the locking portion 72c is provided vertically at the lower end of the rear edge of the left side surface of the board 72a in parallel with the locking portion 72b.

Therefore, when the lever 48 is in the position shown in the figure, the locking portion 72c is attached to the stopper pin 4.
8c, the door 18 cannot be opened, and the door 18 can only be opened when the lever 48 is in the position indicated by the dashed line D. Also,
The operation lever 70 can be inserted into and removed from the lever 48 only when the lever pin 70c is not in contact with the locking portion 72b, that is, when the lever 48 is in the position shown in the figure or in the position indicated by the dashed line D. It is designed so that it cannot be removed while the operating lever 70 is being pushed down or pushed up.

Next, reference numeral 80 in the figure is a lever lock portion that prevents the operating lever 70 from being inserted into the lever 48 when the lever 48 is at the position indicated by the dashed line D and the door 18 is opened, and is shown in FIG. It is structured like this. In this figure, 81 is an L-shaped member with a front end 81a bent to the left, and a bolt 81b.
It is rotatably attached to the left side surface of the support plate 42 by a nut 81c. Also 82 is L
A pin 8 is installed approximately at the center of the left side surface of the character member 81 in the front and back direction.
A tongue-like member attached by 3, 84 is L
A pin 8 hanging vertically at the rear end of the left side of the character member 81
It is a tongue-shaped member supported by 1d. In this case, the upper end of the member 82 is rotatably attached by a pin 83, and the tongue-like lower end 82a extends downward under its own weight. In addition, the member 84 has a long hole 84a formed along the longitudinal direction at its upper end and is slidably supported by a pin 84d, and a tongue-shaped lower end 84b connects the member 82 and the L-shaped member 81. It extends diagonally forward and downward through the gap. Lower end 84b of left side of member 84
A pin 84c is vertically provided near the member 82, and this pin 84c is in contact with the front edge of the member 82. Further, one end of a tension spring 85 is attached to approximately the center of the left side surface of the member 84 in the front-rear direction, and the other end of this tension spring 85 always biases the member 84 diagonally downward and forward. It is attached to the upper surface of the base 41 with bolts 86 as shown in FIG. As a result, the lower end 84b of the member 84 is always in contact with the upper surface of the base 41.

Thus, the lever lock portion 80 is in the released state as shown in FIG. 3B when the door 18 is closed. That is, the head of the bolt 89 attached to a predetermined location on the lower end of the back surface of the door 18 presses the lower end 84b of the member 84 rearward (to the right in the drawing) against the biasing force of the tension spring 85. Therefore, the pin 81d attached to the rear end of the L-shaped member 81
(Fig. 4) is pushed diagonally upward, the L-shaped member 81 rotates around the bolt 81b, and its front end 8
1a has been lowered to the position shown in the figure. When the door 18 is opened from this state, the L-shaped member 81 rotates in the direction of the arrow J shown in the figure to the position indicated by the two-dot chain line K, and the lever 48 whose front end 81a is located at the position indicated by the two-dot chain line D.
It fits into a notch 48b formed at the tip.
This results in a state in which insertion of the operating lever 70 into the lever 48 is prevented.

Next, reference numeral 93 shown in FIG. 3A is an operation button for operating a movement prevention mechanism (not shown). The movement prevention mechanism has a locking function to prevent the instrument 5 from moving from the connection position or the disconnection/testing position, and is configured such that this locking function is released by pressing the operation button 93. However, this movement prevention mechanism is linked to the movable part of the power switchgear of the appliance 5, and when the power switchgear is in the open state, pressing of the operation button 93 is restricted, thus preventing the lock mechanism from being released. It is composed of

Next, with reference to FIGS. 6A and 6B, a description will be given of the horizontal roller 95 that prevents the rear end of the instrument 5 from moving to the left during the pushing operation. horizontal roller 9
5 is rotatably attached to a support plate 97 by a pin 96, and this support plate 97 is attached to the left rear end of the bottom plate 5a of the instrument 5. in this case,
The horizontal roller 95 is arranged to rotate while contacting the rail 29, and the support plate 97 has bolts 98 and nuts 98 for attaching the instrument 5 to the bottom plate 5a.
a, and bolts 99 and nuts 99a that attach the support plate that supports the wheels 15 to the bottom plate 5a. As a result, the pull-out mechanism 4
When the instrument 5 is pushed in at 0, the movement of the rear end of the instrument 5 to the left, which is caused by pushing only the right end of the instrument 5 backward, is suppressed. Therefore,
The wheel 15 at the left rear end of the instrument 5 is not pressed against the inner surface of the rail 29, and the pushing operation of the instrument 5 can be performed smoothly.

In the above configuration, the procedure for performing maintenance and inspection of the instrument 5 will be explained with reference to FIG. 2A and FIGS. 3A and 3B. First, a switch (not shown) of the control means for controlling opening and closing of the power switchgear of the appliance 5 is operated to open the power switchgear. and,
Twist the dial fastener 26 to open the cover 24 (FIG. 2A), insert the operating lever 70 into the opening 18a, and insert its joint 70b into the tip of the lever 48 (FIG. 3B). In this case, the joint 70b
until it abuts against the lever pin 48a, that is, the third
Insert it to the position indicated by the two-dot chain line A shown in Figure B. Next, while pressing the operation button 93, the handle 70a of the operation lever 70 is pushed down, and the instrument 5 is pulled out to the disconnection/test position. In this case, the handle 70a is pushed down until the lever 48 is at the position indicated by the two-dot chain line D shown in FIG. 3B. If this is not done, the operating lever 70 cannot be removed because the lever pin 70c contacts the locking portion 72b, and the door 18 cannot be opened thereafter because the locking portion 72c contacts the stopper pin 48c. Then, pull out the operating lever 70, release your hand from the operating button 93, and
Hold 3 and open door 18. At this time, the L-shaped member 81 of the lever lock portion 80 rotates to the position indicated by the two-dot chain line K shown in FIG. Also,
The member 82 stands upright with its lower end 82a in contact with the upper surface of the base 41, and therefore the front end 81a of the L-shaped member 81 cannot be pushed down. As a result, the operating lever 70 to the lever 48
insertion is completely prevented. In this state, maintenance and inspection work on the instrument 5 is performed.

Next, after the maintenance and inspection work of the instrument 5 is completed, the door 18 is closed and the lever lock part 80 is set to the released state shown in FIG.
Insert into 8. Next, while pressing the operation button 93, the handle 70a is pushed up. In this case, if the power switchgear of the appliance 5 is in the closed state, the operation button 93
Since the handle 70a cannot be pushed up and the lock function of the movement prevention mechanism cannot be released, the handle 70a cannot be pushed up and the instrument 5 cannot be pushed in. Then, push up the handle 70a until it reaches the upper limit position, that is, move the lever 48 to the position shown in FIG.
After pushing it to the connection position, pull out the operating lever 70. Finally, the cover 24 is closed to complete the work.

According to the embodiment described above, it is possible to reliably pull out and push the instrument 5 from the connection position to the disconnection/test position or from the disconnection/test position to the connection position with the door 18 closed, and the instrument The door 18 can be prevented from being opened unless the door 5 is completely pulled out to the disconnection/test position.
Further, when the door 18 is open, the device 5 is prevented from being pushed by the operating lever 70, and the device 5 is pushed by using a general tool other than the operating lever 70. This can also be prevented. Further, since a horizontal roller 95 is provided to prevent the rear end of the instrument 5 from moving to the left, the pushing operation of the instrument 5 can be performed smoothly.

As explained above, according to this invention, an operating lever, an opening formed in the front door of the high-voltage closing switchboard and into which the operating lever is inserted, and an opening provided in the vicinity of the opening inside the high-voltage closing switchboard are provided. a rotatable lever, into which the operating lever is inserted; a transmission mechanism that converts the rotational movement of the lever into a linear movement in the front-rear direction and transmits the same to the side of the main circuit device; A pair of rails that guide the main circuit device in the front and back direction, and a roller that is rotatably attached to the main circuit device and prevents the main circuit device from moving in the width direction by coming into contact with the rails. The advantage is that the main circuit equipment can be smoothly moved with a small and simple configuration.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram showing the structure of a conventional high-voltage closed switchboard, and Fig. 2 A, B, and C are front, side, and plan views showing the structure of a panel provided with a pull-out mechanism according to an embodiment of this invention. , 3A and 3B are a front view and a side view showing the structure of the drawer mechanism according to the same embodiment, and FIGS. 4 and 5 are both perspective views showing the structure of a part of the drawer mechanism according to the same embodiment. FIG. 6A is a plan view showing the configuration of a horizontal roller 95 which is a part of the pull-out mechanism according to the same embodiment, and FIG. 6B is a sectional view taken along the Y--Y line in FIG. 6A. 5... Instrument (main circuit instrument), 18... Door, 18
a...Opening, 24...Cover, 28, 29...
Rail, 40...Drawer mechanism, 41...Base, 4
2, 43...Support plate, 45...Pin, 46...Cylindrical member, 47...First link, 48...Lever,
48a... Stopper pin, 48b... Notch,
52...Second link, 53...Round bar, 55...Third link, 57...Rack cam, 63...Cam follower, 64...Cam follower support, 70...
...Operation lever, 95...Horizontal roller, 96...Pin, 97...Support plate, 98, 99...Bolt, 9
8a, 99a...Natsuto.

Claims (1)

[Scope of utility model registration request] In a high-voltage closed switchboard that has a door on the front and in which the electrical connection between the bus bar and the main circuit device is disconnected by pulling out the main circuit device stored inside to the front, an operating lever and a door formed on the door are provided. ,
disposed near the opening into which the operating lever is inserted and the opening inside the high-voltage closed switchboard;
a rotatable lever into which the operating lever is inserted; a transmission mechanism that converts the rotational movement of the lever into a linear movement in the front-rear direction and transmits it to the side of the main circuit device; a pair of rails for guiding the main circuit device; and a roller provided horizontally and rotatably on the rear side of the main circuit device to prevent the main circuit device from moving in the width direction by coming into contact with the rails. A main circuit equipment pull-out mechanism in a high-voltage closed switchboard, characterized by comprising: