JPH0321129Y2 - - Google Patents

Description

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

The present invention relates to a closed power distribution board equipped with an insertion/removal mechanism for the contact portion of a control unit that is removably provided in a control center or the like.

[Prior art and its problems]

Generally, in a control center or the like, a box-shaped panel frame is partitioned into a plurality of upper and lower levels by shelf boards to form a plurality of unit chambers, and units are housed in each of these unit chambers in a drawable state. In this unit, control equipment such as a power distribution circuit breaker, an electromagnetic contactor, and a control relay are attached to a common frame, so that predetermined control functions can be obtained. The main circuit of the unit, and optionally the control circuit, are configured to automatically disconnect or connect with the circuit corresponding to the panel frame when the unit is withdrawn from or inserted into the panel frame. In such a unit, the following drawer structures have been proposed for the drawer structure of the unit. Direct pull-out structure by hand According to this structure, the structure is simple because only the hand is used without using a booster. However, not only does it require a large amount of force to take the unit in and out, but it is also impossible to move the unit if it is large. Furthermore, when the unit is pushed in to connect its contact portion to the vertical bus bar, the pushing force is insufficient, resulting in an uncertain connection and poor workability. Screw type drawer structure An example of this structure is the one disclosed in Japanese Utility Model Application Publication No. 56-169711. According to this structure, the above-mentioned drawbacks of the direct drawer method can be solved, but the following problems arise. That is, this structure requires less force, so even if there is a stopper to stop the handle, you will not be able to feel it and will tighten it as much as you like. Therefore, even if one tries to look at the stopper during operation, the stopper cannot be seen, which may result in damage to the stopper. Furthermore, since the stopper cannot be visually observed, it is necessary to sense that the screw has hit the stopper by increasing the rotational torque of the screw. This increase in the rotational torque of the screw is difficult to detect, and therefore not only does it feel uneasy to confirm the position, but when the screw is stopped at an intermediate position, it is difficult to clearly indicate the position. Furthermore, with this structure, it is necessary to turn the screw rod many times to take in and take out the unit, resulting in poor workability. In particular, the upper control unit is about 2000 mm high, making it difficult to operate with a screwdriver or crank, and difficult to insert and remove the unit. Lever type drawer structure Examples of this structure include those described in Japanese Utility Model Publication No. 48-44828 and Japanese Utility Model Application Publication No. 54-150918. Although this structure eliminates the drawbacks of the direct drawer type and screw type, the following problems arise. (A) Regarding the pull-out mechanism described in Japanese Utility Model Publication No. 48-44828 This pull-out mechanism is provided at a position that can be operated from the front of the mounting frame, and consists of an operating cam and a handle that is detachably attached to the cam. , consisting of a drive lever. The movable insertion contact and the fixed insertion contact are inserted and removed by moving the drive lever left and right. However, there is no mechanism to control the connection and disconnection between the movable insertion contact and the fixed insertion contact, and as mentioned above, the control center is partitioned into multiple units vertically with shelves to form multiple unit rooms. There is,
It has become impossible to see it visually. Therefore, when connecting a movable insertion contact and a fixed insertion contact, it is not possible to sufficiently confirm the connection between the contacts, and the resistance during insertion that is felt by the operator's hand is small. The feeling, the so-called "kan", is reliable.
For this reason, the degree of connection of the contacts differs depending on the operator, and cannot necessarily be said to be the same even for the same person.If excessive force is applied when inserting the contact, it may cause damage to some part of the equipment. occurs, and if this continues, it will cause damage to the equipment. On the other hand, if sufficient insertion is not performed, poor contact may occur over time and the contact area may become abnormally heated, or the movable insertion contact may come off from the fixed insertion contact due to vibration, etc. This is dangerous as arcing may occur and short circuits between phases may occur. (B) Regarding the pull-out device described in Japanese Utility Model Application Publication No. 54-150918 According to this device, a semi-circular groove and cutouts are provided at both ends of the groove, and the frame and lever are connected to the handle by the interlocking pin of the handle to open and close the device. Since the lever can be retracted when the device is pulled out, and the closing operation can be performed, the lever does not protrude outside when the opening/closing device is pulled out, making it safe.
It is easy to operate because there is no need to lose the lever and there is no need to attach or detach the lever. However, since the handle position is the same in both the connected and disconnected states, it may be possible to accidentally remove the unit frame to which the device is attached while the unit is in the connected state.
At this time, an arc is generated between the contacts, causing a short circuit accident between phases, which is dangerous. In addition, after the handle is tilted a certain distance toward you from the vertical position for the purpose of disconnecting, it is possible to mistakenly think that disconnection has been performed and return the handle to the original vertical position, which may result in incomplete disconnection. .
Similarly, when moving the handle from a horizontal position to a vertical position for the purpose of making a connection, you may accidentally press the push button, causing the interlocking pin to disengage from the protrusion and moving the handle to the vertical position without realizing it, resulting in an incomplete connection. There is a possibility that this may occur. In such cases, poor contact may occur over time and the contact portion may become abnormally heated, or the movable insertion contact may come off from the fixed insertion contact due to vibration, etc., and an arc may occur at this time, resulting in a short circuit between phases. It is dangerous and may cause accidents.

[Purpose of invention]

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a closed switchboard in which the relative positions of the vertical busbar of the contact frame and the power contact, and between the load contact and the load side terminal can be immediately confirmed. Another object of the present invention is to provide a closed switchboard that ensures the position of the operating body by stopping the movement of the operating body at each predetermined position and regulating the stop position so as to lock the operating body. There is a particular thing. Furthermore, another object of the present invention is to make it possible to visually see the target position of the operation using the display surface, and also to make it possible to see the vertical busbar of the contact frame, the power contact, the load contact, and the load side terminal even when looking up from below. It is an object of the present invention to provide a closed switchboard in which the relative positional relationship between the switchboard and the switchboard can be easily and reliably confirmed.

[Structure of the idea]

The structure of the invention devised to achieve the above purpose is as follows. That is, the present invention comprises: (a) a unit frame for installing equipment that is installed to be removable from a shelf attached to a panel frame and has a display surface formed on the front; (b) a unit frame for installing the equipment. A contact movable in the contact/disconnection direction, which is movably installed in the board frame, and includes a power contact that contacts and separates from a bus bar wired to the panel frame, and a load contact that contacts and separates from a load side terminal. and (c) converting the rocking motion of the operating body that swings in the left-right direction on the front surface of the device mounting unit frame into a linear motion of the contact frame, and moving the contact frame in the approaching and separating direction. a movable power transmission mechanism; (d) a connection position provided on the display surface, where both the power supply and load contacts are connected; located between the connection position and the disconnection position, the power contact is connected and the load contact is connected; Test position where the power supply and load contacts are disconnected; An operation notch consisting of a regulating notch formed at each position of the disconnecting position where both the power supply and load contacts are disconnected, and a connecting groove connecting these regulating notches; (e ) is provided on the operating body of the power transmission mechanism, is biased toward the operating notch, elastically protrudes at the regulating notch, and becomes locked with the regulating notch, and is pushed into the locked state. a lock body to be released; (f) a shaft portion that can move within the connecting groove; and a flange formed on the shaft portion that can be pulled out at the regulating notch but cannot be pulled out when the shaft portion is in the connecting groove; an operating handle whose tip portion is removable from the locking body; and after pushing the locking body with the operating handle to release the locked state, the operating handle is moved along the operating notch groove. This is a closed switchboard equipped with a contact insertion/removal mechanism that drives the contact frame.

【Example】

The present invention will be explained in more detail based on embodiments shown in the drawings. Fig. 1 is a schematic front view showing a part of the closed switchboard in the open state, Fig. 2 is a perspective view showing the relationship between the operating notch, the operating body, and the operating handle, and Fig. 3 shows the operating rod in the disconnected position. 4 and 5 are schematic plan views showing the relationship between the operation of the operating handle and the movement of the contact frame, and FIG. It is a detailed view of a contactor position display nameplate. Reference numeral 5 denotes a unit frame (shown in FIGS. 4 and 5) for mounting equipment, which is installed so as to be removable from the shelf board 2 attached to the panel frame 1. Reference numeral 9 denotes a contact frame (shown in FIGS. 4 and 5), which is movably installed in the unit frame 5, and includes a power contact 7 that comes into contact with and separates from a bus bar 10 wired to the panel frame 1; It is equipped with a load contact 8 that comes into contact with and separates from the load side terminal 11, and the power contact 7 and the load contact 8 are wired to equipment mounted on the unit frame 5 with electric wires (not shown), and It is provided so as to be movable in the away direction. 6 is a power transmission mechanism (shown in Figures 4 and 5);
The swinging motion of the operating rod 19 swinging on the front surface of the unit frame 5 is converted into a linear motion of the contact frame 9 to move the contact frame 9 in the approaching and separating directions. The power transmission mechanism 6 is attached to the unit frame 5,
It includes an interlocking arm 16 formed in an L-shaped plate shape and a drive shaft 17 protruding from the contact frame 9. The interlocking arm 16 is attached to be rotatable about an interlocking arm rotation shaft 15 (provided at a corner) embedded in the unit frame 5. The drive shaft 17 is inserted into a long hole 16a provided at the tip of the interlocking arm 16 and is freely engaged therewith, thereby driving the contact frame 9. The operating handle 18 for moving the contact frame 9 to the disconnection position, the test position, and the contact position is fitted into the base end of the interlocking arm 16 as described above. An operating rod 19, which is an operating body, is fixed. This operation rod 1
The tip of 9 is attached to the grip frame 5a on the front side of the unit frame 5.
It faces the operating notch 5b which is open to the bottom. The operating rod 19 has a built-in lock collar 21 that is a lock body that is pressed forward by a built-in spring (not shown). Reference numeral 5a denotes a hand grip frame, and the front side thereof is a display surface 50 for displaying the position of the contacts.
b-3 and a connecting groove 5e connecting them are formed. The ends of the lock collars 21 protrude from the regulation notches 5b-1, 5b-2, and 5b-3. There is a fitting hole 21a in the center of the lock collar 21, and the operating handle 18 shown in FIGS. 2 to 5
The distal end portion is inserted and fitted into this fitting hole 21a. This operation handle 18 has an insertion portion 18 at the tip.
a, a flange portion 18b, a small diameter portion 18c which is a shaft portion, and a grip portion 18d, and the grip portion 18d is coated with rubber. The diameter of this insertion portion 18a is larger than the width of the connecting groove 5e formed in the grip frame 5a shown in FIG.
Moreover, it is set smaller than the diameter of the regulating notches 5b-1, 5b-2, and 5b-3. Also, the small diameter portion 18
The diameter of c is set smaller than the width of the connecting groove 5e. The diameter of the flange portion 18b is larger than the diameter of the fitting hole 21a of the lock collar 21 and larger than the width of the connecting groove 5e, and the diameter of the flange portion 18b is larger than the diameter of the fitting hole 21a of the lock collar 21, and larger than the width of the connecting groove 5e.
It is formed smaller than the diameter of 2,5b-3.
As a result, the operating handle 18 is
-1, 5b-2, 5b-3, that is, at the position of the connecting groove 5e between the regulating notches 5b-1, 5b-2, 5b-3, it cannot be inserted into the lock collar 21, and once the lock collar 21 After being inserted into the connecting groove 5e, it cannot be removed from the connecting groove 5e.
And regulation notches 5b-1, 5b-2, 5b-3
At the location shown in FIG.
-1, 5b-2, and 5b-3. Insert the tip of the operating handle 18 into the lock collar 21, and keep pushing the operating handle 18.
By rotating the contactor unit 9 in the right direction in the drawing, the contactor unit 9 can be moved to the test position and the connection position. The reference numeral 25 is a contact position display plate, which indicates the position of the contact operation mechanism, that is, the interlocking arm 16, and indicates the contact position. The grip frame 5a is provided with stoppers 5c at both ends of the connecting groove 5e so that the operating rod 19 is stopped when the operating rod 19 is operated and its tip reaches the regulating notch 5b-1 or 5b-3. , 5d (see Figure 3). Stopper 5c, 5
d is made to come into contact with a trapezoidal head formed at the tip of the operating rod 19, and the inclined surface of the trapezoidal head is made to come into contact with the stopper surface at a substantially right angle when it comes into contact with the stoppers 5c and 5d. I have to. The three large-diameter regulating notches 5b-1, 5b-2, and 5b-3 of the connecting groove 5e in FIG. , the test position where the power contact is connected and the load contact is disconnected, and the disconnection position where both the power and load side contacts are disconnected, and the tip of the operating handle 18 can only be operated in that position. It can be inserted into and withdrawn from the rod 19. Further, when entering the restriction notch 5b-2 at the test position which is an intermediate position, the pivot 22 is
Inspection position stoppers 22 and 23 are provided which swing around b and 23b to open the path and prevent movement from the restriction notch 5b-2. This prevents the operation handle 18 from being inadvertently moved from the test position to the disconnection position or the closing position.
Also, when attempting to move from the disconnection position to the test position, the force is prevented from inadvertently moving directly to the connection position. When operating the operating handle 18, the protrusion 22a or 2 of the stopper 22 or 23
By pushing 3a, the other end is raised and the operating handle 18 can be moved freely.

[Effect]

Next, the operation of this embodiment will be explained. Insert the operating handle 18 into the lock collar 21 so that the tip of the lock collar 21 touches the operating rod 19.
The flange 18b of the operating handle 18 is released from the locking state with any of the regulating notches 5b-1, 5b-2, and 5b-3 buried inside and formed on the display surface 50, and the flange 18b of the operating handle 18 is disengaged from the operating rod 19. Push until it touches the tip. The operating rod 19 can now be moved to the regulating notch 5b-
1, 5b-2, and 5b-3 and becomes free to move, and the operating handle 18 also becomes able to move left and right in the connecting groove 5e. While maintaining this state, move the operating handle 18 to the left or right until it hits the inspection position stoppers 22, 23 or the stoppers 5c, 5d. At this time, if necessary, the projections 22a of the stoppers 22, 23
Alternatively, you can press 23a to pass through the test position. When the force pushing the operating handle 18 is removed after it has been moved to a predetermined position, the lock collar 21 is pushed by the spring and the regulating notches 5b-1, 5b-
2, 5b-3 and locks the movement of the operating rod 19. In addition, when moving from the central inspection position to another position, operate the operating handle 18 after pushing up either of the inspection position stoppers 22 or 23.

[Effect of the idea]

The present invention has the above configuration and has the following effects. (1) A display surface is formed on the front surface of the device mounting unit frame, and a lock body that swings left and right and elastically protrudes into a locked state at a predetermined regulation position is provided so that it can be seen from the display surface. As soon as the door is opened, the position of the lock body, that is, the relative positional relationship between the vertical bus bar of the contact frame and the power contact, and between the load contact and the load side terminal can be immediately confirmed. Furthermore, since the tip of the lock body moves from side to side, it is easier and more certain to confirm its position, especially when looking up from below, compared to when it moves up and down. (2) Since the operation groove is formed with a regulating means that stops the rocking movement of the lock body that swings in the left and right direction at each predetermined position and regulates the stop position so that the lock body is locked, Reliable position retention. (3) Since the target position for operating the lock body can be visually seen on the display surface, the lock body can be operated smoothly, and there is no problem even when operating the unit located at the top. (4) The position of each stopper of the control unit can be checked during operation on the display screen, and the operating handle is directly received via the operating body that comes into contact with the stopper, so no excessive force is applied and the stopper is not damaged. . (5) The contact frame can be moved in and out by simply attaching the operation handle to the lock body without rotating unlike the screw type, and it is easy to operate as it only needs to be operated in the left and right directions. It is easy to operate, especially when the unit is located in a high position. (6) The range of movement of the power transmission mechanism, operating body, locking body, and operating handle is flat in the left and right direction, and the thickness is not large, allowing the overall space of the operating device to be reduced.

[Brief explanation of the drawing]

Fig. 1 is a schematic front view showing a part of the closed switchboard in the open state, Fig. 2 is a perspective view showing the relationship between the operating notch, the operating body, and the operating handle, and Fig. 3 shows the operating rod in the disconnected position. 4 and 5 are schematic plan views showing the relationship between the operation of the operating handle and the movement of the contact frame, and FIG. It is a detailed view of a contactor position display nameplate. 1: Panel frame, 2: Shelf board, 5: Unit frame for equipment installation, 5b: Connection groove, 5b-1, 5b-2,
5b-3: Regulation notch, 6: Power transmission mechanism, 7:
Power contact, 8: Load contact, 9: Contact frame, 1
0: bus bar, 11: load side terminal, 18: operation handle, 21: lock collar, 50: display surface.

Claims (1)

[Scope of Claim for Utility Model Registration] (a) A unit frame for mounting equipment that is installed in a manner that can be inserted into and taken out from a shelf attached to a panel frame and that has a display surface formed on the front; (b) Mounting of the equipment; movably installed in a unit frame for the board, and comprising a power contact that connects and disconnects from a bus bar wired to the panel frame and a load contact that connects and disconnects from a load side terminal, and moves in the connection and separation direction. (c) converting the rocking motion of the operating body that swings in the left-right direction on the front surface of the device mounting unit frame into a linear motion of the contact frame so that the contact frame can be moved into the contact frame; a power transmission mechanism that moves in the away direction; (d) a connection position provided on the display surface, where both the power supply and load contacts are connected; and a power transmission mechanism that is located between the connection position and the disconnection position, where the power supply contact is connected and the load contact is connected; A test position where the contact is disconnected; a disconnection position where both the power supply and load contacts are disconnected; and an operation notch consisting of a regulating notch formed at each position and a connecting groove connecting these regulating notches. (e) It is provided on the operating body of the power transmission mechanism, is biased toward the operating notch, elastically protrudes at the regulating notch, becomes engaged with the regulating notch, and is engaged with the regulating notch when pushed. (f) a shaft portion that can move within the connection groove; and a lock body formed on the shaft portion, which can be pulled out at the regulating notch but cannot be pulled out when the shaft portion is in the connection groove; an operating handle having a flange portion and a tip portion of which is detachable from the lock body; A closed switchboard equipped with a contact part insertion/removal mechanism, characterized in that the contact frame is moved and driven.