Enclosed switchboard

Abstract

To provide an enclosed switchboard by which a device accommodated in the enclosed switchboard can be quickly pulled out of the switchboard when replacing it and prevent this work from being disturbed during maintenance and inspection of the device.SOLUTION: An enclosed switchboard includes a storage unit, a first rail, an opening / closing door, and an opening / closing mechanism. The storage unit accommodates a device. The first rail assists in moving the device. The opening / closing door opens and closes an opening of the storage unit. The opening / closing mechanism maintains the opening / closing door of the closed state substantially horizontally by tiling it forward and maintains it substantially perpendicular by lifting the opening / closing door of the opened state. The opening / closing door includes a flame, a multi-directional opening door, and a second rail. The frame is provided along an edge of the opening of the storage unit and is operated by the opening / closing mechanism. The multi-directional opening door is supported by the frame, opens downward integrally with the frame while the opening of the storage unit is opened, and opens laterally independently of the frame while the opening is closed. The second rail is connected to the first rail by the opening state of the opening / closing door.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to the structure of an enclosed switchboard.

Background Art

[0002] Patent Document 1 discloses an enclosed switchboard provided with a device for pulling out equipment such as a circuit breaker housed inside the board to the outside of the board. In this conventional enclosed switchboard, wheels are attached to the equipment to be pulled out. The pulling-out device includes two types of rails for assisting the movement of the object to be pulled out. The first rail is provided on the bottom plate constituting the housing that houses the object to be pulled out. The second rail is provided on the back surface of the front door of this housing. While the object to be pulled out is housed in the housing, the wheels of this object to be pulled out are positioned on the first rail.

[0003] The forming direction of the first rail is the front-rear direction of the housing. The front door of the housing has a downward-opening structure, and when it is tilted forward to a horizontal state, its back surface is connected to the bottom plate of the housing, and moreover, the heights of both are the same. The forming direction of the second rail is the vertical direction, but its end is connected to the end of the first rail when the front door is in a horizontal state. Therefore, when the front door is opened and becomes horizontal, the two types of rails are connected in the front-rear direction of the housing. Therefore, by rolling the wheels along these rails, the object to be pulled out is pulled out of the board.

[0004] In addition, the applicant is aware of the documents described below including Patent Document 1 as those related to the invention of the present application.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Patent Document 2

Patent Document 3

Patent Document 4

Summary of the Invention

Problems to be Solved by the Invention

[0006] According to the conventional closed switchboard, it can be pulled out of the cabinet during maintenance, inspection, or replacement of the equipment to be withdrawn. However, unlike in the case of replacement, it is not always necessary to pull out the equipment to be maintained / inspected outside the cabinet during maintenance and inspection operations. That is, in this case, the operator who has opened the front door looks into the cabinet to perform the operation, or the operator who has opened the front door enters the cabinet to perform the operation. However, in the maintenance and inspection operations using the conventional closed switchboard, the presence of the horizontally positioned front door may interfere with this operation.

[0007] Also, although not mentioned in Patent Document 1, the fact that wheels are attached to the equipment to be withdrawn means that the weight of the equipment to be withdrawn is considerable. Therefore, it is a burden for the operator to perform the withdrawal operation of the heavy equipment to be withdrawn and the storage operation after withdrawal by hand. From this point as well, there is room for improvement in the conventional closed switchboard.

[0008] One object of the present invention is to provide a technique for quickly pulling out the equipment housed in a closed switchboard outside the cabinet during replacement of the equipment and suppressing interference with this operation during maintenance and inspection of the equipment. Another object of the present invention is to provide a technique for facilitating the withdrawal and storage operations of the equipment housed in a closed switchboard.

Means for Solving the Problems

[0009] The present invention is a closed switchboard having the following features. Various equipment is housed in the closed switchboard. The closed switchboard includes a housing portion, a first rail, an opening / closing door, and an opening / closing mechanism. The accommodation part opens on the front surface of the enclosed switchboard. The accommodation part accommodates devices that can move in the front-rear direction of the enclosed switchboard by the rotation of wheels. The first rail is provided on the bottom surface of the accommodation part. The first rail assists the forward and backward movement of the device due to the rotation of the wheels. The opening / closing door is provided at the opening of the accommodation part. The opening / closing door also opens and closes the opening of the accommodation part. The opening / closing mechanism tilts the opening / closing door in the closed state forward and maintains it substantially horizontally. The opening / closing mechanism lifts the opening / closing door in the open state and maintains it substantially vertically. The opening / closing door includes a frame, a multi-directionally opening door, and a second rail. The frame is provided along the edge of the opening. The frame operates by the opening / closing mechanism. The multi-directionally opening door is supported by the frame. The multi-directionally opening door can also perform a downward opening operation integrally with the frame while the opening is opened by the opening / closing door. The multi-directionally opening door can further perform a lateral opening operation independently of the frame while the opening is closed by the opening / closing door. The second rail is provided on the multi-directionally opening door. The second rail is also connected to the first rail in the open state of the opening / closing door and assists the forward and backward movement of the device due to the rotation of the wheels.

Advantages of the Invention

[0010] According to the present invention, for example, when replacing a device, the multi-directionally opening door and the frame can be integrally opened downward to quickly pull out the device to the outside of the enclosed switchboard. For example, when maintaining or inspecting a device, only the multi-directionally opening door can be opened laterally to suppress interference with this operation.

Brief Description of the Drawings

[0011]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Figure 13

Figure 14

Figure 15

Figure 16

Figure 17

Figure 18

Figure 19

Figure 20

Embodiments for Carrying Out the Invention

[0012] Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings, the same reference numerals are given to common elements, and redundant descriptions are omitted. Further, the present invention is not limited by the following embodiments.

[0013] 1. Description of the configuration example FIGS. 1 to 3 are diagrams for explaining a configuration example of the switchboard 100 as a closed switchboard according to the embodiment. FIG. 1 corresponds to a view of the switchboard 100 cut along the 1-1 cross section shown in FIG. 2 as seen from above. FIG. 2 corresponds to a view of the switchboard 100 cut along the 2-2 cross section shown in FIG. 1 as seen from the front. FIG. 3 corresponds to a view of the switchboard 100 cut along the 3-3 cross section shown in FIG. 2 as seen from the left. FIGS. 1 to 3 are also diagrams when the heavy equipment HEQ described later is completely accommodated in the lower accommodation portion 15 of the switchboard 100 (when the drawing-in is completed).

[0014] For convenience of explanation, the X-axis, Y-axis, and Z-axis are drawn in FIGS. 1 to 3. The X-axis direction corresponds to the width direction of the switchboard 100, and the right side on the paper surface (the left side for the switchboard 100) is defined as the positive direction. The Y-axis direction corresponds to the depth direction of the switchboard 100, and the Z-axis direction corresponds to the height direction of the switchboard 100. The directions indicated by the X-axis, Y-axis, and Z-axis are common also in the figures other than FIGS. 1 to 3.

[0015] The switchboard 100 has an angle frame structure, and FIGS. 1 and 3 depict the angles 12B, 12L, 12R, 12T, 16B, and 16T that constitute the housing 11 of the switchboard 100. The angles 16B and 16T are provided at positions where the front door (not shown) of the switchboard 100 contacts. The angles 12B, 12L, 12R, and 12T are provided at the positions of the middle doors. The front door is provided outside the middle door for safety considerations, but its illustration is omitted because its relevance to the embodiment is low.

[0016] Angles 12B and 16B are L-shaped angles located in the bottom direction of the housing 11, and angles 12T and 16T are L-shaped angles located in the top direction of the housing 11. These L-shaped angles extend parallel to the X-axis direction. Angle 12L is an L-shaped angle located in the left direction of the housing 11, and angle 2R is an L-shaped angle located in the right direction of the housing 11. These L-shaped angles extend parallel to the Z-axis direction.

[0017] Various devices are housed in the housing 11. Figure 3 depicts a shelf plate 13 provided in the housing 11. The space above the housing 11 partitioned by this shelf plate 13 is defined as the upper accommodation part 14, and the lower space is defined as the lower accommodation part 15. In the upper accommodation part 14, lightweight devices LEQ are housed. Examples of the lightweight devices LEQ include a circuit breaker, a current transformer (CT), and an instrument transformer (VT). In the lower accommodation part 15, heavy devices HEQ are housed. An example of the heavy device HEQ is a transformer.

[0018] Wheels WHL and WHR are attached to the heavy device HEQ. The wheels WHL and WHR may be the wheels of a trolley on which the heavy device HEQ is placed. On the bottom surface of the lower accommodation part 15, a rail 17L combined with the wheel WHL and a rail 17R combined with the wheel WHR are provided. Guide grooves 171 are respectively formed along the longitudinal direction of these rails in the rails 17L and 17R, and the flanges of the wheels WHL and WHR are fitted here. The distance between the rails 17L and 17R allows the heavy device HEQ to move in the Y-axis direction as the treads of the wheels WHL and WHR roll on the rails 17L and 17R along the rails 17L and 17R. Incidentally, in some cases, the guide grooves 171 of the rails 17L and 17R may be omitted. In this case, the distance between the flanges of the wheels WHL and WHR is slightly narrower than the distance between the rails 17L and 17R.

[0019] The middle door of the switchboard 100 includes a first middle door composed of doors 21L and 21R, and a second middle door composed of doors 22L, 22R and frame 23. The first middle door is a double-leaf door that opens and closes the opening of the upper storage part 14 located on the front surface of the switchboard 100. The doors 21L and 21R may be single-leaf doors that open to the left or right direction. However, since there may be a limitation on the space in front of the switchboard 100, it is desirable to adopt a double-leaf door rather than a single-leaf door. The second middle door is a door that opens and closes the opening of the lower storage part 15 located on the front surface of the switchboard 100. Handles 28L and 28R are respectively provided on the doors 21L and 21R.

[0020] The second middle door includes a third middle door composed of doors 22L and 22R. Similar to the first middle door, the third middle door is composed of a double-leaf door. The doors 22L and 22R may be single-leaf doors that open to the left or right direction. The difference between the first middle door and the third middle door is the position of the hinge fulcrum. That is, the former has hinge fulcrums at the positions of angles 12L and 12R, and the latter has a hinge fulcrum at the position of the frame 23. Specifically, the hinge fulcrum of the door 21L is the hinge 24L provided on the angle 12L, and that of the door 21R is the hinge 24R provided on the angle 12R. On the other hand, the hinge fulcrum of the door 22L is the hinge 25L provided on the frame 23, and that of the door 22R is the hinge 25R provided on the frame 23. Handles 29L and 29R are respectively provided on the doors 22L and 22R.

[0021] The frame 23 is a member that supports the doors 22L and 22R. The frame 23 is provided along the opening of the lower storage part 15. One end of the hinge 26L is attached to the lower left part of the frame 23, and one end of the hinge 26R is attached to the lower right part of the frame 23. The other end of the hinge 26L is attached to the left end part of the angle 12B, and the other end of the hinge 26R is attached to the right end part of the angle 12B. As can be understood from the attachment positions of the hinges 26L and 26R shown in FIG. 3, these hinges are the hinges for "opening downward" the second middle door.

[0022] The door 22L is provided with a rail 27L, and the door 22R is provided with a rail 27R. The rails 27L and 27R are provided so as to protrude from the back surface to the front surface of the doors 22L and 22R. Guide grooves 271 (see FIGS. 6 and 7) are respectively formed along the longitudinal direction of these rails in the rails 27L and 27R. Slits 272 are also formed in the rails 27L and 27R.

[0023] The width of the guide groove 271 is slightly wider than the width of the flanges of the wheels WHL and WHR. The interval (length in the X-axis direction) between the rails 27L and 27R is equal to that between the rails 17L and 17R. The width (length in the X-axis direction) of the guide groove 271 is equal to that of the guide groove 171. When the second middle door is opened as described later, the flanges of the wheels WHL and WHR are engaged with the guide grooves 271 of the rails 27L and 27R, and the treads of the wheels WHL and WHR roll on the rails 27L and 27R, so that the heavy equipment HEQ is configured to be movable in the Y-axis direction. That is, the rails 27L and 27R are configured to connect the front end of the rail 17L and the rear end of the rail 27L, and the front end of the rail 17R and the rear end of the rail 27R when the second middle door is opened downward. The reason for forming the slit 272 is to avoid interference between the rails 27L and 27R and the angle 16B during this downward opening. Note that the description of the opening operation of the second middle door will be described later.

[0024] The downward opening operation of the second middle door is controlled by the operation of the winch mechanism 31 depicted in FIGS. 1 and 3. This winch mechanism 31 is provided at the left rear of the housing 11. FIG. 4 is a diagram showing the schematic configuration of the winch mechanism 31. As shown in FIG. 4, the winch mechanism 31 includes drums 32, 33, and 34, a rotary handle 35, and a switching lever 36. When pulling out the heavy equipment HEQ from the switchboard 100, the switching lever 36 is set to the delivery side (OUT), and when pulling back the heavy equipment HEQ to the switchboard 100, the switching lever 36 is set to the pull-back side (IN). Note that the position where the winch mechanism 31 is provided is not limited to the left rear of the housing 11, and it may be arranged at the right rear, left front, or right front of the housing 11 by appropriately arranging the pulleys and link mechanisms described later.

[0025] The drum 32 is a drum for feeding out and winding up the wire 44 shown in FIGS. 1 and 3. The drum 33 is a drum for feeding out and winding up the wire 55 shown in FIG. 1. The drum 34 is a drum for feeding out and winding up the wire 47 shown in FIG. 1. The rotary handle 35 is the power source for these drums. The switching lever 36 is a lever for switching the feeding and winding operations of these wires. The rotary handle 35 and the switching lever 36 are operated, for example, by an operator who replaces the heavy equipment HEQ. Although not shown, the housing 11 has a door or panel on its back surface, and when operating the rotary handle 35 or the like, the power reception of the switchboard 100 is stopped, safety measures such as grounding are implemented, and then this door or panel is opened.

[0026] As shown in FIGS. 1 and 3, a wire 44, one end of which is connected to a drum 32, is wound around pulleys 41, 42, and 43 attached to the left side surface of a housing 11. The other end of the wire 44 is connected to a ring 45 provided on the back surface of the upper left portion of a frame 23. As shown in FIG. 3, the pulleys 41, 42, and 43 are located in an upper accommodation portion 14, and all are located above the ring 45. In addition, the pulleys 41, 42, and 43 may be arranged anywhere as long as they maintain a necessary insulation distance from charged objects such as electrical equipment and bus work installed in a switchboard 100 and do not interfere with maintenance and inspection work, and have an arrangement with the opening and closing function of a second middle door described later. Some of the pulleys may be omitted or added.

[0027] As shown in FIG. 1 and FIG. 5 described later, a wire 55, one end of which is connected to a drum 33, is wound around pulleys 51, 52, 53, and 54 in this order. The other end of the wire 55 is connected to a ring 56 (see FIG. 5) provided on the bottom surface of a weighing device HEQ. The pulleys 51, 52, 53, and 54 are located below the bottom surface of the weighing device HEQ. Among these, the pulleys 51 and 52 are attached to the bottom surface of a lower accommodation portion 15, and the pulleys 53 and 54 are attached to a movable portion 58 (see FIG. 1). The operation of the movable portion 58 will be described later. As shown in FIGS. 5 and 6 described later, the pulley 52 is located in front of the switchboard 100 relative to the pulley 51. Also, the pulley 52 is arranged behind the switchboard 100 relative to an angle 12B. The pulley 53 is attached behind the movable portion 58, and the pulley 54 is attached in front of the movable portion 58. In a state where the drawing of the weighing device HEQ into the switchboard 100 is completed, the pulley 54 is arranged behind the switchboard 100 relative to the angle 12B. In a state where the drawing out of the weighing device HEQ from the switchboard 100 is completed, as shown in FIG. 6 described later, the pulley 54 is arranged in front of the switchboard 100 relative to the angle 12B, and the intervals between the pulleys 53 and 54 and the slide length of the movable portion 58 are determined such that the weighing device HEQ is arranged in front of the switchboard 100 relative to an angle 16B.

[0028] As shown in FIG. 1, a wire 47 having one end connected to a drum 34 is wound around a pulley 46 attached to the bottom surface of the lower housing portion 15. The other end of the wire 47 is connected to a ring 48 provided on the back surface of the weighing equipment HEQ.

[0029] 2. Description of the operation in the switchboard 100 2-1. Lateral opening operation of the first and third middle doors FIG. 5 is a diagram for explaining the lateral opening operation of the first and third middle doors. FIG. 5 is a diagram of a state in which the weighing equipment HEQ has been completely pulled into the switchboard 100. For convenience of explanation, the illustration of the shelf board 13 is omitted in FIG. 5. As already described, the middle door of the switchboard 100 includes a first middle door (doors 21L and 21R) and a third middle door (doors 22L and 22R), and these middle doors are double-leaf doors. FIG. 5 depicts a state in which the first and third middle doors are opened simultaneously. As can be understood from this figure, when the first and third middle doors are opened simultaneously, the door 22L is located inside the door 21L, and the door 22L is also located inside the door 21R. This is due to the difference between the hinge fulcrums of the first middle door and those of the third middle door.

[0030] 2-2. Lower opening operation of the second middle door FIGS. 6 to 8 are diagrams for explaining the lower opening operation of the second middle door. FIGS. 6 to 8 are also diagrams for explaining the moving operation of the weighing equipment HEQ, and are diagrams of a state in which the weighing equipment HEQ has been completely pulled out from the switchboard 100. FIGS. 6 to 8 respectively correspond to FIGS. 1 to 3. As already described, the middle door of the switchboard 100 includes a second middle door (doors 22L, 22R, and frame 23), and the hinges 26L and 26R are provided at the lower left and right portions of the frame 23. Also, a wire 44 from the winch mechanism 31 (drum 32) is connected to a ring 45 on the back surface of the frame 23.

[0031] While the second middle door is in the closed state, the second middle door is pulled by the winch mechanism 31 and maintained substantially vertically. When the drum 32 rotates in the wire 44 payout direction by the operation of the winch mechanism 31, the second middle door is tilted forward by the payout of this wire 44. This payout operation ends at a position where the second middle door becomes substantially horizontal. Thereby, the opened second middle door is maintained substantially horizontally (see Fig. 8). On the other hand, when the drum 32 rotates in the wire 44 winding direction, the second middle door is lifted by the winding of this wire 44. This winding operation ends at a position where the second middle door becomes substantially vertical.

[0032] When the second middle door is in the open state, the rear end of the rail 27L and the front end of the rail 17L are connected, and the rear end of the rail 27R and the front end of the rail 17R are connected. Also, the positions of these four rails in the height direction are aligned. Therefore, the rails 17L and 27L form one rail extending in the front-rear direction (Z-axis direction), and the rails 17R and 27R also form one rail in the same way. Then, the wheels WHL and WHR can roll on the corresponding one rail each. Thereby, the weight equipment HEQ can move in the front-rear direction.

[0033] 2-3. Front-rear movement of the weight equipment HEQ Similar to the downward opening operation of the second middle door, the front-rear movement of the weight equipment HEQ is also controlled by the operation of the winch mechanism 31. When the drum 33 rotates in the wire 55 winding direction by the operation of the winch mechanism 31, the movable part 58 slides forward by the winding of this wire 55. Figs. 9 and 10 are diagrams for explaining the configuration and operation of the slide mechanism including the movable part 58. As shown in Fig. 9, the movable part 58 is combined with the fixed part 57, and this fixed part 57 is attached to the bottom surface of the lower accommodation part 15 (see Fig. 6).

[0034] The fixed part 57 and the movable part 58 are adjusted in terms of size and position in the height direction so that the movable part 58 does not interfere with the angle 12B when the movable part 58 slides. A plurality of rollers may be provided on the sliding surfaces of the movable part 58 and the fixed part 57 so as to reduce the frictional force, or a sheet made of an organic material such as a nylon material may be provided.

[0035] As shown in FIG. 10, the sliding of the movable part 58 is performed along the longitudinal direction (Y-axis direction) of the fixed part 57. While the drum 33 is rotating in the winding direction of the wire 55, a force that pushes the pulley 53 forward (a force that acts so that the pulley 52 and the pulley 53 approach each other) acts on the pulley 53, and thereby the movable part 58 slides forward. Along with this sliding operation, the weighing equipment HEQ is sent forward (see FIG. 8). When the weighing equipment HEQ is pulled backward, the drum 33 rotates in the feeding direction of the wire 55, and the movable part 58 slides backward. The movable part 58 is configured not to move easily in directions other than the Y-axis. For example, as shown in FIG. 9, the cross-section of the movable part 58 in the X-Z plane is configured to hold a part of the cross-section of the fixed part 57 in the X-Z plane.

[0036] The backward pulling of the weighing equipment HEQ is performed by winding the wire 47 by the drum 34. While the drum 34 is rotating in the winding direction of the wire 47, a force that pulls the weighing equipment HEQ backward acts on the weighing equipment HEQ, so the weighing equipment HEQ is pulled backward. Incidentally, when the weighing equipment HEQ is sent forward, the drum 34 rotates in the feeding direction of the wire 47.

[0037] 3. Description of the operation of the winch mechanism Next, the operation of the winch mechanism 31 will be described with reference to FIGS. 11 to 20. In the description of this operation, a description of a configuration example for realizing this operation will also be given as appropriate. FIGS. 11 to 16 are diagrams for explaining the operation of the gear mechanism that controls the rotation of the drum 32. On the other hand, FIGS. 17 to 20 are diagrams for explaining the operation of the gear mechanism that controls the rotation of the drums 33 and 34.

[0038] FIG. 11 is a diagram showing the state of the gear mechanism for controlling the drum 32 when the second middle door is closed and the heavy equipment HEQ is housed in the lower housing portion 15. As shown in FIG. 11, this gear mechanism includes a shaft 61 that rotates by operating a rotary handle 35. An bevel gear 62 and a screw gear 63 that rotate together with the shaft 61 are provided on the shaft 61. A bevel gear 64 is meshed with the bevel gear 62, and the rotational force of the bevel gear 62 is transmitted to the gear 65 via the bevel gear 64. The transmission of the rotational force after the gear 65 will be described with reference to FIGS. 17 to 20. A helical gear 66 is meshed with the screw gear 63.

[0039] On the side of the helical gear 66, gears 67 and 68 and an operating gear 71 of the drum 32 are provided. The axes of the helical gear 66, the gear 68, and the operating gear 71 are rotatably fixed to the housing of the winch mechanism 31. The gear 68 and the operating gear 71 are always meshed. Further, the gear 68 and the gear 67 are connected via a connector 69 so as to be always meshed. A rod 74 that moves in the vertical direction (Z-axis direction) is provided on the connector 69. The vertical movement of the rod 74 causes the gear 67 and the helical gear 66 to mesh or the meshing to be released. Specifically, when the rod 74 moves downward (negative Z-axis direction), these gears mesh, and when the rod 74 moves upward (positive Z-axis direction), the meshing is released.

[0040] The other end of the rod 74 is connected to a movable plate 75 at a fulcrum 76. The movable plate 75 is connected to a holding member 77 fixed to the housing of the winch mechanism 31 via a spring 79. Note that a guide hole 78 for assisting the vertical movement of the rod 74 is provided in the holding member 77.

[0041] Above the movable plate 75, levers 91, 92, and 93 are provided. The fulcrums 911 of lever 91, the fulcrums 921 of lever 92, and the fulcrums 931 of lever 93 are fixed to the housing of the winch mechanism 31 so that each lever can rotate. The action points 913 of lever 91 and the action points 923 of lever 92 are located in front of the fulcrum 76 (negative Y-axis direction). On the other hand, the action point 933 of lever 93 is located behind the fulcrum 76 (positive Y-axis direction). The effort points 912 of lever 91 are connected to the frame 23 via a link mechanism (e.g., a wire) not shown. The effort points 922 of lever 92 are connected to the switching lever 36 via a link mechanism not shown. The effort points 932 of lever 93 are connected to the back of the weighing device HEQ via a link mechanism not shown or directly.

[0042] In the state shown in FIG. 11, the switching lever 36 is in the delivery side (OUT), the action point 923 of the lever 92 is above the movable plate 75 (Z direction), and no force is exerted on the movable plate 75. Note that the state of the gear mechanism for operating the drums 33 and 34 described later in this state corresponds to FIG. 17. Since the gear 67 and the helical gear 66 are engaged, the rotational force of the rotary handle 35 is transmitted to the operating gear 71. Then, the drum 32 rotates in the direction of paying out the wire 44, whereby the second middle door is opened. When the second middle door is opened, the effort point 912 moves downward and the action point 913 moves upward. Since the effort point 932 of the lever 93 is connected to the back of the weighing device HEQ via a link mechanism not shown or directly, a force is acting to press the movable plate 75 downward by the action point 933. Then, the force for pressing down the front of the movable plate 75 by the action point 913 decreases, and the movable plate 75 tilts toward the rear (positive Y-axis direction). As the opening of the second middle door progresses and reaches a substantially horizontal state, as shown in FIG. 12, the rod 74 pulled by the movable plate 75 moves upward and the gear 67 disengages from the helical gear 66, so that the rotational force of the rotary handle 35 is no longer transmitted to the operating gear 71.

[0043] Furthermore, the relationship between the force application point 912 and the force application point 913 is adjusted such that when the second middle door is in a substantially horizontal state (for example, when the angle between the frame 23 and the X-Y plane is 5 degrees or less), the force with which the force application point 913 presses the movable plate 75 is lost. FIG. 12 is a diagram showing the state of the gear mechanism when the second middle door is open and the weighing equipment HEQ is housed in the lower housing portion 15. In the state shown in FIG. 12, since the movable plate 75 is inclined rearward (in the positive Y-axis direction), the force application point 933 is in contact with the movable plate 75. The state of the gear mechanism for operating the drums 33 and 34 described later in this state corresponds to FIG. 18. When the state of FIG. 18 is reached, as will be described later, the rotational force of the gear 65 is transmitted to the operating gear 72 by the gear mechanism, and the wire 55 can be wound up by the drum 33. By rotating the rotary handle 35, the weighing equipment HEQ is gradually sent out from the switchboard 100.

[0044] FIG. 13 shows a state in which the feeding of the weighing equipment HEQ progresses from the state of FIG. 12, and the force application point 932 of the lever 93 is separated from the back surface of the weighing equipment HEQ via a link mechanism (not shown) or directly. As a result, since the force application point 932 moves in the direction opposite to the Y direction, the force with which the force application point 933 presses the movable plate 75 downward disappears. When feeding the weighing equipment HEQ, the force application point 922 is on the feeding side (OUT) by switching the switching lever 36. Then, the force application point 923 moves upward, but as the weighing equipment HEQ is fed out, the force application point 932 moves forward (negative Y-axis direction), so the force application point 933 also moves upward. Therefore, since the force pressing the movable plate 75 downward decreases in front of and behind the movable plate 75, the movable plate 75 moves upward as a whole (in the positive Z-axis direction). Therefore, the upward movement state of the rod 74 is maintained, and the state in which the gear 67 does not mesh with the helical gear 66 is also maintained. The state of the gear mechanism for operating the drums 33 and 34 described later in this state corresponds to FIG. 18. This state continues until the weighing equipment HEQ is completely pulled out from the switchboard 100.

[0045] Figure 14 is a diagram showing the state when the weighing device HEQ is retracted. When retracting the weighing device HEQ, the force point 922 moves to the retracting side (IN) by switching the switching lever 36. Then, the action point 923 moves downward, and a force that pushes the movable plate 75 downward acts in front of the movable plate 75. Then, the movable plate 75 tilts forward (negative Y-axis direction), but since the force that pushes the movable plate 75 downward still decreases behind the movable plate 75, the upward movement state of the rod 74 is maintained, and the state where the gear 67 does not mesh with the helical gear 66 is also maintained. The state of the gear mechanism for operating the drums 33 and 34 described later in this state corresponds to FIG. 19. As can be determined from FIG. 19, since the rotational force of the rotary handle 35 is transmitted to the operating gear 73, the wire 47 is wound up by the drum 34, and the retraction of the weighing device HEQ is started.

[0046] Figure 15 is a diagram showing the state where the weighing device HEQ is completely retracted and housed in the lower housing portion 15. When the weighing device HEQ is completely retracted and the weighing device HEQ is retracted and housed in the lower housing portion 15, the force point 932 moves rearward (positive Y-axis direction). Therefore, the force that pushes the movable plate 75 downward increases behind the movable plate 75. Then, the movable plate 75 moves downward (negative Z-axis direction), and the rod 74 pushed by the movable plate 75 also moves downward. As a result, the gear 67 returns to the state of meshing with the helical gear 66. When the gear 67 meshes with the helical gear 66, the rotational force of the rotary handle 35 is transmitted to the operating gear 71.

[0047] When the gear 67 meshes with the helical gear 66, the rotational force of the rotary handle 35 is transmitted to the operating gear 71. Then, the drum 32 rotates in the direction of rewinding the wire 44, whereby the second middle door is closed. When the second middle door is closed, the force point 912 moves upward and the action point 913 moves downward. Then, since the action point 913 pushes downward in front of the movable plate 75, the downward movement state of the rod 74 is maintained, and the state where the gear 67 meshes with the helical gear 66 is also maintained. FIG. 16 shows this state. This state is the same as FIG. 11 except for the state of the lever 92 interlocked with the switching lever 36.

[0048] Figure 17 is a view showing the state of the gear mechanism for controlling drums 33 and 34 when the second middle door is closed and the weighing device HEQ is housed in the lower housing portion 15. As shown in Figure 17, in addition to the gear 65 described in Figure 11, this gear mechanism includes an operating gear 72 of drum 33, an operating gear 73 of drum 34, and gears 81, 82, 84, 85, 87, and 88. The axes of the operating gears 72 and 73 and the axes of the gears 65, 81, 84, and 87 are rotatably fixed to the housing of the winch mechanism 31.

[0049] The operating gear 72 and the gear 81 are always in mesh. The gear 81 and the gear 82 are connected via a connector 83 so as to always be in mesh. By being connected via the connector 83, the gear 82 is rotatable about the center of the rotation axis of the gear 81. Also, the operating gear 73 and the gear 84 are always in mesh. The gear 84 and the gear 85 are connected via a connector 86 so as to always be in mesh. By being connected via the connector 86, the gear 85 is rotatable about the center of the rotation axis of the gear 84. A link 94 is connected to the connectors 83 and 86. One end of the link 94 is at the position of the connector 86 near the axis of the gear 85, and the other end is connected to the switching lever 36.

[0050] The gear 88 and the gear 87 are connected via a connector 89 so as to always be in mesh. One end of a link 95 is connected to the position of the connector 89 near the axis of the gear 88. A spring 97 provided on a holding member 96 is also connected to this position. The other end of the link 95 is connected to the force point 912 described in Figure 11.

[0051] When the force point 912 is in the state shown in FIGS. 11 and 16, that is, when the second middle door is closed and the heavy equipment HEQ is accommodated in the lower accommodation part 15, this force point 912 is located upward. Therefore, the gear 88 connected to the force point 912 via the link 95 is pulled upward by the spring 97. Accordingly, the gear 88 is disengaged from the gear 65. FIG. 17 shows this state. FIG. 17 corresponds to FIG. 11.

[0052] When the second middle door is opened, the force point 912 moves in the X direction or downward, so that the gear 88 comes into engagement with the gear 65. FIG. 18 shows this state. Incidentally, the opening angle of the second middle door when the gear 65 and the gear 88 are engaged is adjusted to be substantially the same as that when the screw gear 63 and the helical gear 66 are disengaged. That is, it is adjusted so that the state of FIG. 18 is achieved when the state of FIG. 12 is reached. When the rotary handle 35 is continuously turned in the state of FIG. 18, a rotational force is transmitted to the drum 33 through the gears 65, 88, 85, 81, 72, and the wire 55 is wound back, whereby the heavy equipment HEQ is pulled out. This state continues until the heavy equipment HEQ is completely pulled out from the switchboard 100.

[0053] Next, referring to FIGS. 19 and 20, the retraction will be described. The link 94 operates such that when the switching lever 36 is switched to the feed side (OUT), the gear 87 engages with the gear 82 and does not engage with the gear 85. The link 94 operates such that when the switching lever 36 is switched to the retraction side (IN), the gear 87 engages with the gear 85 and does not engage with the gear 82. FIG. 18 shows the state where the gear 88 engages with the gear 65 and the gear 87 engages with the gear 82, and FIG. 19 shows the state where the gear 88 engages with the gear 65 and the gear 87 engages with the gear 85. At this time, the state of the gear mechanism for driving the drum 32 corresponds to FIG. 14.

[0054] In the state shown in FIG. 18, the rotational force of the rotary handle 35 is transmitted from the gear 65 to the operating gear 72. Then, the drum 33 rotates in the direction of rewinding the wire 55, whereby the heavy equipment HEQ is sent forward. In the state shown in FIG. 19, the rotational force of the rotary handle 35 is transmitted from the gear 65 to the operating gear 73. Then, the drum 34 rotates in the direction of rewinding the wire 47, whereby the heavy equipment HEQ is pulled backward.

[0055] When the heavy equipment HEQ is pulled backward, the force point 912 connected to one end of the link 95 moves upward. Therefore, the gear 88 connected to this force point 912 is pulled upward by the spring 97, and the gear 88 no longer meshes with the gear 65. FIG. 20 shows this state. At this time, the state of the gear mechanism that drives the drum 32 corresponds to FIG. 15.

[0056] 4. Effects According to the switchboard 100 according to the embodiment described above, for example, when replacing the heavy equipment HEQ, the second middle door can be opened downward to quickly pull out the heavy equipment HEQ to the outside of the switchboard 100. Also, for example, when performing maintenance and inspection of the heavy equipment HEQ, the third middle door can be opened in a double-leaf manner to suppress interference with this operation.

[0057] Also, according to the switchboard 100 according to the embodiment, by switching with the switching lever and the operation of the gear mechanism, the opening operation of the second middle door by the rotation of the drum 32 and the feeding operation of the heavy equipment HEQ by the rotation of the drum 33 can be continuously performed, and also, the pulling-back operation of the heavy equipment HEQ by the rotation of the drum 34 and the closing operation of the second middle door by the rotation of the drum 32 can be continuously performed. Therefore, it is also possible to facilitate the feeding operation and pulling-back operation of the heavy equipment HEQ.

[0058] 5. Corresponding relationship between the present invention and the embodiment The second middle door in the above-described embodiment corresponds to the "opening and closing door" of the present invention. The third middle door corresponds to the "multi-directional opening door" of the present invention. Rails 17L and 17R correspond to the "first rail" of the present invention. Rails 27L and 27R correspond to the "second rail" of the present invention. The configuration including the drum 32, pulleys 41, 42, and 43, wires 44, and ring 45 corresponds to the "opening and closing mechanism" of the present invention.

[0059] The configuration including the slide mechanism including drums 33 and 34, pulleys 46, 51, 52, 53, and 54, wires 47 and 55, and fixed part 57 and movable part 58 corresponds to the "insertion and extraction mechanism" of the present invention. The configuration of the gear mechanism for controlling drum 32 described in FIGS. 11 to 16 and the configuration of the gear mechanism for controlling drums 33 and 34 described in FIGS. 17 to 20 correspond to the "gear mechanism" of the present invention.

Explanation of Reference Numerals

[0060] 11 Housing 12B, 12L, 12R, 12T, 16B, 16T Angles 13 Shelf board 14 Upper storage part 15 Lower storage part 17L, 17R, 27L, 27R Rails 171, 271 Guide grooves 21L, 21R, 22L, 22R Doors 23 Frame 24L, 24R, 25L, 25R, 26L, 26R Hinges 272 Slits 28L, 28R, 29L, 29R Handles 31 Winch mechanism 32, 33, 34 Drums 35 Rotating handle 36 Switching lever 41, 42, 43, 46, 51, 52, 53, 54 Pulleys 44, 47, 55 Wires 45, 48, 56 Rings 57 Fixed part 58 Movable part 61 Shaft 62, 64 Bevel gears 63 Screw gear 65, 66, 67, 68, 81, 82, 84, 85, 87, 88 Gears 66 Helical gears 71, 72, 73 Operating gears 69, 83, 86, 89 Connectors 74 Rod 75 Movable plate 76 Fulcrum 77, 96 Retaining materials 78 Guide holes 79, 97 Springs 91, 92, 93 Levers 911, 921, 931 Fulcrums 912, 922, 932 Force points 913, 923, 933 Action points 94, 95 Links 100 Switchboard LEQ Light equipment HEQ Heavy equipment WHL, WHR Wheels

Claims

1. An enclosed switchboard for housing various machines, comprising: a housing portion that opens on the front surface of the enclosed switchboard and houses a machine that can move in the front-rear direction of the enclosed switchboard by the rotation of wheels; a first rail provided on the bottom surface of the housing portion to assist the front-rear movement of the machine by the rotation of the wheels; an opening / closing door provided at the opening of the housing portion to open and close the opening; an opening / closing mechanism that tilts the opening / closing door in the closed state forward to maintain the opening / closing door substantially horizontally, and lifts the opening / closing door in the open state to maintain the opening / closing door substantially vertically; wherein the opening / closing door is provided along the edge of the opening and is a frame that operates by the opening / closing mechanism; a multi-directional opening door supported by the frame, which moves downward integrally with the frame while the opening is opened by the opening / closing door, and can perform a lateral opening movement independently of the frame while the opening is closed by the opening / closing door; a second rail provided on the multi-directional opening door, which is connected to the first rail in the open state of the opening / closing door to assist the front-rear movement of the machine by the rotation of the wheels; An enclosed switchboard characterized by comprising the above.

2. The enclosed switchboard according to Claim 1, further comprising: a loading / unloading mechanism that sends out the machine located in the housing portion to the front of the enclosed switchboard and pulls back the machine located in front of the enclosed switchboard to the housing portion in the open state of the opening / closing door; a gear mechanism that controls the sending-out operation of the machine by the loading / unloading mechanism following the opening operation of the opening / closing door by the opening / closing mechanism, and the closing operation of the opening / closing door by the opening / closing mechanism following the pulling-back operation of the machine by the loading / unloading mechanism; An enclosed switchboard characterized by further comprising the above.

3. The enclosed switchboard according to Claim 1 or 2, wherein the multi-directional opening door includes double-leaf doors that open outwards and are attached to the frame via hinges provided on the left and right frame members constituting the frame. An enclosed switchboard characterized by the above.

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