KR100337115B1 - Pull-out switchgears and their locking devices - Google Patents

Abstract

It is an object of the present invention to reduce the number of parts of a locking device without impairing the function of the locking device.

The locking device for restraining and locking the movement of the device body 4 that is movable along the guide member is made by using a single plate-shaped locking body that is rotatably supported by the device body. A movement locking portion for locking the movement of the apparatus main body by engaging with the guide member, and a locking release portion for restraining rotation of the locking device to release the locking state when the movable plug is connected to the fixed plug;

A connection preservation section for maintaining the connection state of the fixed and movable plugs and a rotation restraining section for restraining the rotation of the locking device when the device main body is moved are provided.

Description

Pull-out switchgears and their locks

The present invention relates primarily to a drawer-type switchgear assembled in a closed switchgear and a locking device suitable for use in the switchgear.

The closed switchgear divides the inside of an outer box made of a box made of ground metal into a partition made of a ground metal or an insulating material to form a plurality of compartments, and each of these compartments is connected to a common bus bar. It consists of a load side conductor connected to a transmission cable for transmission to the load of side branch conductors, other electric chambers, load equipment, etc., a switchgear using a circuit breaker folding the conductors, and a control unit necessary for supervisory control. .

In such a closed switchboard, it is necessary to de-energize the internal equipment before the inspection in order to prevent an electric shock accident of the inspection worker due to the residual of the internal equipment and the voltage in each internal inspection of the compartment.

For this reason, for example, as described in Japanese Patent Application Laid-Open No. 4-54807, the opening and closing device is moved from the test position to the operating position according to a guide member having a predetermined length disposed in the compartment accommodating the opening and closing device. In the case of internal inspection, the opening and closing device is removed from the compartment to the test position along the guide member, and the busbar branch conductor and the load conductor are reliably disconnected.

Next, this conventional drawer type switching device will be described with reference to FIGS. 8 to 15. 8 is a front view of the drawer type opening and closing device, FIG. 9 is a side view, FIG. 10 is a partially enlarged front view showing the vicinity of the connection plug, FIG. 11 is a sectional view taken along line XX of FIG. 10, and FIG. 12 is a movable plug to the fixing plug of FIG. 10. Fig. 13 is an explanatory diagram of a state in which the switchgear is moved.

The conventional drawer-type switchgear E has an opening-closing circuit and a fixing plug F connected to the opening-closing circuit, and according to the guide member G of a predetermined length, the test position shown in FIG. And a locking device J for restraining and locking the movement of the device body H.

The fixing plug F and the locking device J are installed at the lower left side of the front of the main body H, and the contact Z of the main body H and the contacting member Y, which are connected to the load side conductor, Y and Y are freely connected to the rear of the main body H, Z is installed.

Moreover, wheels K and K which are free to move in accordance with the guide member G are provided on the front left and right lower sides of the device body H.

The movable plug L connected to the control unit is detachably attached to the fixed plug F at the front side of the device main body H.

Moreover, the U-shaped plug hook M is supported on the upper and lower surfaces of the fixed plug F, and restrains the movement with respect to the fixed plug F of the said movable plug L.

The locking device J includes a hook-shaped locking body O and a plug cover P freely rotatable through a horizontal axis N on the right side of the main body H, an operating spring Q for operating the locking body 0 in one rotational direction, and The support lever protruding from the main body H is provided with the unlocking lever R in which the horizontal movement is supported freely.

The unlocking lever R restrains and locks the rotation of the locking body 0 when the movable plug L is connected to the fixing plug F. _One end thereof contacts the protrusion 0 ₁ protruding from the locking body 0 and the other end thereof. Reaches the inside of the fixing plug F.

And the pressing part S which can engage with the other end of the unlocking lever R in FIG. 11 is provided in the said movable plug L. As shown in FIG.

The locking body 0 is provided with a movement locking part 02 on the yaw that locks the movement of the device main body H by engaging with one end d of the fixed shank D installed in parallel with the guide member G.

As shown in Fig. 15, the plug cover P is bent at an end opposite to the support portion to the main assembly H, and the connection preservation portion P1 for retaining the connection state of the fixed and movable plugs F and L, and the main assembly H, When moved, the rotation restraint part P2 which restrains the rotation of the plug cover P, the contact part P3 which abuts on one end of the fixed shank D, and the guide pin T protrudingly installed on the main body of the device (Fig. The guide hole P4 on the arc which accepts) is shown.

When the drawer type switch E configured as described above is connected with the movable plug L to the fixed plug F of the switch E which is drawn out to the test position, the pressing part S presses the release lever R, and the locking device 0 is opposed to the operating spring Q. It rotates clockwise in FIG. 11 centering on the horizontal axis N, and it becomes the state of FIG. 12 (connection detection, unlocking).

Next, when moving the switchgear E from the test position to the operation position according to the guide member G, the contact portion P3 of the plug cover P is the projection D1 of the fixed shank D as shown in FIG. The plug cover P rotates clockwise about the horizontal axis N. As shown in FIG.

Accordingly, when the switch E is moved from the test position to the operation position, as shown in Fig. 13, the connection preservation portion P1 of the plug cover P covers the entire surface of the movable plug L, and the folding of the movable plug L is constrained (preventing folding). ).

In addition, when attempting to move the switchgear E to the operation position without connecting the movable plug L at the test position, since the locking body 0 is operating on the fixed body D side as shown in FIG. The end of D is in contact with d and the movement of switchgear E is constrained (locked).

In addition, when the movable plug L is connected to the fixed plug F of the apparatus main body H drawn out to the test position as described above, the plug hook M is clockwise from the position indicated by the broken line in FIG. 14 to the position indicated by the solid line. By rotating, the pin of the movable plug L can be locked into the engaging hole of the plug hook M.

After the movable plug L is locked by the plug hook M and the switchgear E is moved to the operation position, the operation part of the plug hook M is covered by the lock cover U in the range from immediately after the movement to the operation position. It becomes difficult to operate the operation unit.

However, as described above, the locking device J of the drawer type opening and closing device E has a locking device O, a plug cover P, and an unlocking lever R, so that the number of parts is high. Therefore, there existed a problem that workability and assembly workability were bad and a cost became high.

The present invention has been made in view of the above circumstances, and by providing a locking body which is swingably supported by the apparatus main body, a moving locking part, a unlocking part, a connection preservation part and a moving restraint part, without losing the function of the locking device. It is an object of the present invention to provide a drawer-type switchgear and its locking device, which can reduce the number of parts of the locking device and can improve the processing and assembly work.

1 is a side view of a part of the switchgear according to the invention omitted

2 is a front view in which a part of the switchgear according to the present invention is omitted.

3 is an explanatory diagram showing an operating state of a switchgear according to the present invention;

4 is an explanatory diagram showing an operation process of the switchgear according to the present invention.

Figure 4 (a) is a test position, Figure 4 (b) is a process of connecting the movable plug to the fixed plug, Figure 4 (c) is an unlocking process of the unlocking portion, Figure 4 (d) is an operating position.

5 is a side view schematically showing a closed switchboard in which the switchgear according to the present invention is incorporated;

Fig. 6 is a side view in which part of the embodiment 2 of the switchgear according to the present invention is omitted.

Fig. 7 is a side view in which part of the embodiment 3 of the switchgear according to the present invention is omitted.

8 is a front view of a switchgear showing a conventional example

9 is a side view of a switchgear showing a conventional example

Fig. 10 is a partially enlarged front view showing the vicinity of a connection plug showing a conventional example;

11 is a cross-sectional view taken along the line X-X of FIG.

12 is an explanatory diagram of a state in which a movable plug is connected to the fixed plug of FIG.

13 is an explanatory diagram of a state in which the switchgear of FIG. 12 is moved;

14 is a plan view of only the fixed plug and the movable plug portion

15 is a perspective view of a plug cover

<Description of the symbols for the main parts of the drawings>

2: guide member 3: fixing plug

4: main unit 5: locking unit

6: Movable plug 50, 50A, 50B: locking body

51, 51A, 51B: Moving lock part 52, 52A, 52B: Unlocking part

53, 53A, 53B: Connection preservation part 54, 54A, 54B: Rotational restriction part

The drawer-type switchgear according to the first aspect of the present invention is provided with a fixed plug to which a movable plug is detachably attached and an open / close circuit connected to the fixed plug, the apparatus main body being movable in a drawer type according to a predetermined guide member, and the apparatus main body. And a locking device for locking the locking device, the locking device being configured to be rotatably supported by the device body, which locks and locks the movement of the device body by engaging with the guide member. A movement lock portion, a lock release portion for restraining rotation by locking the locking body when the movable plug is connected to the fixing plug, a connection preservation portion for preserving a connection state of the fixing and movable plug; When the device body is moved, it is characterized in that the rotational restraint portion for restraining the rotation of the locking body is provided.

The drawer-type switchgear which concerns on 2nd invention is characterized in that the said locking body is formed of one board | plate body or one wire rod.

The locking device of the drawer-type switchgear according to the third aspect of the present invention is a drawer-type switchgear which is provided with a fixed plug to which the movable plug is detachably attached and an opening-and-closing circuit connected to the fixed plug and which is movable in a drawer type according to a predetermined guide member. The locking device for locking the opening and closing device is provided with a locking body that is rotatably supported by the opening and closing device, and the locking body restrains and locks the movement of the device body by engaging with the guide member. When the movable plug is connected to the movable locking portion and the fixed plug, the unlocking portion for restraining the lock by restraining the rotation of the locking body, the connection holding portion for preserving the connection state of the fixed and movable plug, and It is characterized in that the rotational restraint section is provided to restrain the rotation of the locking body when the device body is moved.

Embodiment 1

EMBODIMENT OF THE INVENTION Hereinafter, this invention is explained in full detail by the figure which shows embodiment. 1 is a side view of a part of the switchgear omitted, FIG. 2 is a front view of a part of the switchgear omitted, FIG. 3 is an explanatory view showing the operating state, FIG. 4 is an explanatory view showing the operation process, FIG. It is a side view which shows typically the closed switchgear which a switchgear is built in.

As shown in Fig. 5, in the closed switchboard, the inside of the metal outer box 1 forming the spherical box shape is the busbar chamber 1a, the cable chamber 1b, and the switchgear by a partition wall made of a ground metal or an insulating material. The main chamber 1c is divided into a control unit chamber 1d, a bus bar side branch conductor A is arranged in the bus chamber 1a, a load side conductor B is arranged in the cable chamber 1b, and a switch unit 1c is opened and closed. The device C is freely arranged to move, and a controller device (not shown) is housed in the controller room d.

Moreover, a pair of guide members 2 and 2 for guiding the switchgear C freely from the test position to the operation position are arranged in the switchgear chamber 1c at a predetermined interval in the horizontal direction.

These guide members (2) and (2) are opposed to the upper guide piece (21) and the lower guide face (22) at predetermined intervals up and down, and the upper guide piece (21) and the lower guide piece (22). It is formed in a cross-section c-shaped by the connection part piece 23 which connects this.

At one end in the longitudinal direction of the guide member 2, the upper guide part 21 and the connecting part 23 are cut out to provide a cutout 2a.

The switchgear C includes a device main body 4 provided with a locking circuit and a fixing plug 3 connected to the open / close circuit, and a locking device that restrains and locks the movement of the device main body 4 from the test position to the operation position. 5) is provided.

The movable plug 6 connected to the control device is detachably attached to the fixed plug 3 from the front side of the apparatus main body 4.

In addition, a U-shaped plug hook 31 is attached to the upper and lower surfaces of the fixed plug 3 to restrain the movement of the movable plug 6 with respect to the fixed plug 3.

The main body 4 is provided with the fixing plug 3 and the locking device 5, and the front and rear lower left and right wheels (7), (7) free light according to the guide member (2), (2) These wheels (7) and (7) make the device main body a moving material.

The locking device 5 is rotated through a longitudinal support shaft 8 arranged between a pair of opposing support pieces 4a and 4a with a predetermined interval up and down on the right side of the device body 4. One locking device 50 which is freely supported may be used.

The lock 50 is operated in the clockwise direction of Fig. 4 (a) by an actuating spring 9 on a coil wound around the support shaft 8.

The locking body 50 of Embodiment 1 shown to FIG. 1 thru | or 4 is formed by one board | plate body, A pair of curved surfaces 5a and 5a protrude and are provided in the upper and lower ends of the center part of the front-back direction. And it is fitted to the said support shaft 8 by the gon-tonggoen which penetrates these bending pieces 5a and 5a.

As shown in Fig. 1, the locking device 50 using the plate body protrudes below the support position at the rear end in the moving direction with respect to the center of rotation, so that the upper guide of the cutout portion 2a of the guide member 2 is provided. The movable locking part 51 which can abut on the subpiece 21 is provided, and protrudes above the supporting position at the front end of the moving direction with respect to the center of rotation, so that the movable plug 6 connected to the fixed plug 3 is provided. An unlocking portion 52 in contact with one side and restraining rotation by the operating spring 9 of the locking body 50, and bending at the front end of the unlocking portion 52 toward the fixing plug 3; The connection preservation part 53 is provided, and it rotates so that it may protrude below the support position in the movement direction electric charge end part with respect to the rotation center, and can contact the front-edge edge 21a of the upper guide part piece 21 of the said guide member 2. The restraining part 54 is provided.

The drawer type switch C configured as described above does not connect the movable plug 6 to the fixed plug 3 of the main body 4 drawn out to the test position according to the guide member 2, and the switch C is connected to the operation position. As shown in (a) of FIG. 4, the locking body 50 is operated by the operating spring 9 on the guide member 2 side as shown in FIG. This movement locking portion 51 restrains the movement of the switchgear C by abutting the upper guide portion 21 of the cutout portion 2a of the guide member 2 (locking), and the test shown in FIG. When connecting the movable plug 6 to the fixed plug 3 of the switchgear C drawn out to the position, the connection retaining portion 53 is rotated counterclockwise against the operating spring 9. ) Can be retracted from the connection path of the movable plug 6, and therefore, the movable plug 6 can be easily attached to the fixed plug 3 It can belong. Further, when the locking member 50 is rotated counterclockwise in Fig. 4 (b) against the operating spring 9, the cutout portion 2a is provided at one end of the guide member 2, Since the rotational confinement portion 54 does not interfere with the guide member 2, the locking member 50 can be rotated as described above.

After connecting the movable plug 6 to FIG. 4 (c), the locking device 50 is rotated in the clockwise direction of FIG. 4 (b) by the force of the operation spring 9, and the unlocking portion 52 is activated. Contact with one side of the plug 6 and the rotation by the operating spring (9) of the locking body 50 is restrained, the locking device 50 is in parallel with the guide member (2) to the main body 4 Can be moved along the guide member 2 (connection detection, unlocking).

Therefore, the movement locking part 51 can be prevented from contacting the upper guide part piece 21 of the cutout part 2a of the guide member 2.

In this case, as shown in Fig. 4C, the connection storage portion 53 enters the connection path of the movable plug 6 and faces the front surface of the movable plug 6, so that the movable plug can be prevented from being pulled out.

4 (d) shows the operation position, the rotation of the locking device 50 is constrained by the guide member (2) in accordance with the movement of the switchgear C, the connection state of the fixed plug (3) and movable plug (6) Can be surely preserved.

As described above, when the movable plug 6 is connected to the fixed plug 3, the locking by the operation spring 9 of the locking body 50 can be restrained to release the lock. Can be moved from the test position to the operating position according to the guide members (2) and (2).

As the opening / closing device C moves, the rotational constraining portion 54 contacts the tip edge portion 21a of the upper guide portion 21 of the guide member 2, so that the rotation of the locking member 50 is guided. Since it restrains by, the connection state of the fixed plug 3 and the movable plug 6 can be reliably preserved.

Embodiment 2

Next, Embodiment 2 shown in FIG. 6 will be described.

In the second embodiment, as shown in FIG. 6, the locking body 50 is rotated freely through the vertical support shaft 8 as in the first embodiment, as shown in FIG. 6. The rotation was freely supported through 8A), and the basic configuration is the same as that of the first embodiment, and thus the drawings and detailed description of the common points are omitted.

Embodiment 2 shown in FIG. 6 uses one locking body 50A which can be rotated freely via the support shaft 8A which protruded in the horizontal direction on the right side surface of the apparatus main body 4. As shown in FIG.

The locking body 50A is formed of a single triangular plate body, and the support shaft 8A is fitted into a through hole drilled in the upper and lower middle portions thereof, and the locking device 50A and the device body 4 are provided. The operating spring 9A is interposed between them.

As shown in Fig. 6, the locking member 50A made of a plate body is in contact with the upper guide portion 21 of the cutout portion 2a of the guide member 2 at the rear end in the moving direction with respect to the center of rotation. 51A of movable locking parts are provided, and the locking body is bent to the front end of the movable plug 6 connected to the fixed plug 3 by bending to the fixed plug 3 side at the top of the moving direction with respect to the rotation center. An unlocking portion 52A and a connection preservation portion 53A for restraining rotation by the operating spring 9A of 50A are provided, and at the charge end in the moving direction with respect to the rotation center, A rotational constraining portion 54A that is in contact with the upper surface of the upper guide portion 21 is provided.

The drawer-type switchgear C of the second embodiment configured as described above has the switchgear C without connecting the movable plug 6 to the fixed plug 3 of the switchgear C drawn out at the test position according to the guide member 2. The lock device 50A is moved to the position of FIG. 6 by the operating spring 9A, that is, the movement lock part 51A enters the cutout part 2a of the guide member 2. Since the state of operation is preserved in the position, the movement locking portion 51A abuts on the upper guide portion 21 of the cutout portion 2a of the guide member 2, and the movement of the switchgear is restrained (locked).

In addition, when the movable plug 6 is connected to the fixed plug 3 of the switchgear which is drawn out at the test position, the lock retainer 50A rotates counterclockwise against the operating spring 9A. The 53A can be retracted from the connection path of the movable plug 6.

Therefore, the movable plug 6 can be easily connected to the fixed plug 3. In addition, when the locking member 50A is rotated counterclockwise in Fig. 6 against the operating spring 9A, the cutout portion 2a is provided at one end of the guide member 2, and the rotation restraint portion is provided. Since 54A does not interfere with the guide member 2, the locking device 50A can be rotated as described above.

After connecting the movable plug 6, the locking device 50A is rotated by the force of the operating spring 9A, and the unlocking portion 52A and the connection retaining portion 53A contact the front surface of the movable plug 6, Rotation by the operating spring 9A of the locking body 50A is restrained, and the lower end of the locking body 50A is parallel to the guide member 2.

Accordingly, the movement locking portion 51A can be prevented from contacting the upper guide portion 21 of the cutout portion 2a of the guide member 2, and the switch C can be moved along the guide member 2. State (connection detection, unlock).

In this case, since the unlocking portion 52A and the connection holding portion 53A face the front surface of the movable plug 6, it is possible to prevent the movable plug 6 from being pulled out, and the fixing plug 3 and the movable plug can be prevented. The connection state of (6) can be saved.

As described above, when the movable plug 6 is connected to the fixed plug 3, it is possible to restrain the rotation by the operating spring 9A of the locking body 50A and release the lock. According to the guide member 2, it can move from a test position to an operation position.

As the rotational restraint 54A contacts the upper surface of the upper guide part 21 of the guide member 2 as the movement of the switchgear C moves, the rotation of the locking member 50A is constrained by the guide member 2 so as to be fixed. The connection state of the plug 3 and the movable plug 6 can be reliably preserved.

Embodiment 3

Next, Embodiment 3 shown in FIG. 7 will be described.

In the third embodiment of the present invention, instead of forming the locking member 50A freely supported on the device body 4 via the supporting shaft 8A in the lateral direction, as in the second embodiment, a single plate body is shown. As shown in Fig. 8, the wire rod was formed by bending one wire rod, and since the basic configuration is the same as that of the first and second embodiments, the drawings and detailed description of the common points are omitted.

Embodiment 3 shown in FIG. 7 uses the one locking body 50B which can be rotatably supported by the support shaft 8A which protruded in the horizontal direction on the right side of the apparatus main body 4. As shown in FIG.

The locking member 50B extends in the vertical direction, and includes a first lever part piece 55 and a second lever part piece 56 and an upper end and a second lever part piece of the first lever part piece 55 which are arranged before and after the moving direction. And a connecting lever portion piece 57 for connecting the lower end of the connecting portion 56, and a supporting piece 58 is provided in the middle portion of the connecting lever piece piece 57, and the above-mentioned hole is formed in the through hole drilled in the supporting piece 58. The support shaft 8A is fitted, and the actuation spring 9A is interposed between the connecting lever portion 57 and the device body 4.

As shown in FIG. 7, the locking member 50B of the wire rod is provided with a cutout portion of the guide member 2 at a lower end portion of the first lever portion piece 55 which is rearward and downward in the moving direction with respect to the rotation center. The movement locking part 51B which is able to contact the upper guide part piece 21 of 2a) is provided, and it bends toward the fixing plug 3 side at the upper end part of the 2nd lever part piece 56 which becomes the moving direction top side with respect to the rotation center. And a lock release portion 52B and a connection retention portion 53B which come into contact with the front surface of the movable plug 6 connected to the fixed plug 3 and restrain the rotation by the operating spring 9A of the lock 50B. Is provided, and the rotational constraining portion 54B which is in contact with the upper surface of the upper guide part piece 21 of the guide member 2 at the lower end of the second lever part piece 56 which is lower in the whole moving direction with respect to the rotational center. Installed.

The drawer-type switchgear C of the third embodiment configured as described above is provided with the switchgear C without connecting the movable plug 6 to the fixed plug 3 of the switchgear C drawn out to the test position according to the guide member 2. When moving to the driving position, the locking body 50B is positioned in FIG. 7 by the operation spring A, that is, the position where the movement locking portion 51B enters in the cutout 2a of the guide member 2. Since the movement lock portion 51B abuts on the upper guide portion 21 of the cutout portion 2a of the guide member 2, the movement of the switchgear C is restrained (locked).

In addition, when the movable plug 6 is connected to the fixed plug 3 of the opening and closing device C drawn out to the test position, the locking body 50B is rotated counterclockwise against the operating spring 9A. 53B) can be retracted from the connection path of the movable plug 6.

Therefore, the movable plug 6 can be easily connected to the stationary plug 3. In addition, in the case where the locking member 50B is rotated counterclockwise in FIG. 7 against the operating spring 9A, the cutout portion 2a is provided at one end of the guide member 2, and the rotation restraint portion is provided. Since 54B does not interfere with the guide member 2, the locking member 50B can be rocked as described above.

After the connection of the movable plug 6, the locking member 50B is rotated by the force of the operating spring 9A, and the unlocking portion 52B and the connection retaining portion 53B come into contact with the front surface of the movable plug 6. As a result, rotation by the operating spring 9A of the locking member 50B is restrained, and the movement restraint 51B of the locking member 50B is positioned above the guide member 2.

Therefore, the movement locking part 51B can be prevented from contacting the upper guide part piece 21 of the cutout part 2a of the guide member 2, and the switch C can be moved along the guide member 2. State (connection detection, unlock).

In this case, since the unlocking part 52B and the connection holding part 53D face the front surface of the movable plug 6, it is possible to prevent the movable plug 6 from being pulled out, and the fixing plug 6 and the movable plug ( The connection state of 6) can be saved.

As described above, when the movable plug 6 is connected to the fixed plug 3, the rotation by the operating spring 9A of the locking member 50B can be restrained to be in the unlocked state. According to the guide member 2, it can move from a test position to an operation position.

The rotational restraint 54B comes into contact with the upper surface of the upper guide part 21 of the guide member 2 as the switch C moves, and the rotation of the locking member 50B is constrained by the guide member 2. The connection state of the fixed plug 3 and the movable plug 6 can be reliably preserved.

In addition, although the opening-and-closing device C which uses a drawer type | mold breaker was demonstrated in the above Embodiments 1-3, the switching device C in this invention may be a switching device, such as a disconnecting device.

According to the drawer type opening and closing device according to the first invention and the locking device according to the third invention, a movement locking portion for locking the movement of the device body to a lock body rotatably supported by the device body, and restraining the rotation of the locking body to unlock it; The lock release part, the connection preservation part which preserves the connection state of a plug, and the rotation restraint part which restrains rotation of a lock body can be installed, and the number of parts of a lock device can be reduced without impairing the function of a lock device. have.

Therefore, the cumulative error and failure rate due to the large number of parts can be reduced, and operations such as manufacturing and assembly can be simplified and the cost can be reduced.

According to the drawer-type switchgear according to the second invention, the locking device can be easily formed by molding the plate or bending the wire rod, and the cost can be further reduced.

Claims (3)

A locking plug for attaching and detaching the movable plug freely and an opening / closing circuit connected to the fixing plug are provided, and the locking device for locking the locking device is provided with an apparatus body capable of withdrawing and moving according to a predetermined guide member. The lock body is rotatably supported by the device body, and the lock body includes a movement locking part for restraining and locking the movement of the device body by engaging with the guide member, and the movable plug to the fixing plug. Is connected, the lock release portion for restraining the rotation of the lock body to release the lock state, the connection retention portion for retaining the connection state of the fixed and movable plugs, and the lock body when the device body is moved. Drawer-type switchgear, characterized in that the rotational restraint portion is installed to restrain the rotation. The method of claim 1, The lock body is a drawer type switch is formed of a sheet or one wire. A fixed plug for attaching and detaching the movable plug freely and an opening / closing circuit connected to the fixed plug are provided, and the locking device for locking the opening / closing device is mounted on a drawer type switchgear capable of withdrawing and moving according to a predetermined guide member. A locking body rotatably supported on the locking body, the locking body restraining and locking the movement of the main body by engaging with the guide member, and when the movable plug is connected to the fixing plug, A lock release portion for restraining the lock by releasing the lock, releasing the connection for preserving the connection state of the fixed and movable plugs, and a rotation for restraining the rotation of the lock when the device body is moved. Locking device of the drawer-type switchgear characterized in that the restraint portion is installed.