CN110831368A - Power line plug anti-pulling-out device of server cabinet and using method thereof - Google Patents

Abstract

The invention discloses a power line plug anti-pulling-out device of a server cabinet and a use method thereof, and relates to the technical field of safety protection of the server cabinet. The power line plug of the server cabinet is inserted into the external power line plug, the switch device is changed from a normally closed state to a disconnected state, and the armature is supported by the first elastic piece, so that the limiting plate blocks wheels of the server cabinet and prevents the server cabinet from moving; when the power line plug of the server cabinet is pulled out from the external power line plug, the conductive loop is communicated, the armature iron and the magnetized iron core are combined together, the limiting plate moves downwards, and the server cabinet is in a movable state. The invention can prevent the power line plug of the server cabinet from being missed to pull out.

Description

Power line plug anti-pulling-out device of server cabinet and using method thereof

Technical Field

The invention relates to the technical field of safety protection of a server cabinet, in particular to a power line plug anti-pulling device of the server cabinet and a using method thereof.

Background

When the server cabinet needs to be tested, the power line plug of the server cabinet needs to be inserted into the external power line plug of the external power supply first, so that the external power supply supplies power to the server cabinet.

In the process that a tester tests the server cabinet, the server cabinet is powered on all the time, and once the test is completed, the power line plug of the server cabinet needs to be pulled off from the external power line plug, so that the server cabinet can be moved.

However, after the test of the server cabinet is completed, the tester often forgets to pull the power plug of the server cabinet out of the external power plug, so as to move the server cabinet, which easily causes the damage of the power plug of the server cabinet and even causes the electric shock hazard.

Therefore, it is an urgent technical problem to be solved by those skilled in the art to prevent the power line plug of the server cabinet from being unplugged.

Disclosure of Invention

The invention aims at the defects in the prior art and provides the power line plug anti-pulling-out device of the server cabinet and the use method thereof.

In order to realize the purpose, the invention provides the following technical scheme:

the utility model provides a device is pulled out in power cord plug leak protection of server rack, include stop device and be used for the switching device who is connected with external power cord plug, stop device includes the power and from the top down limiting plate that connects gradually, armature, first elastic component, the iron core that is equipped with conductive winding, conductive winding establishes ties with power and switching device and forms electrically conductive return circuit, when the power cord plug of server rack and external power cord plug peg graft the cooperation, switching device becomes the off-state by the normally closed state.

Furthermore, the shell of the external power line plug is provided with a jack which is used for being matched with an inserted rod of a power line plug of the server cabinet;

the switch device is arranged in a shell of the external power line plug and comprises a first conducting strip, a second conducting strip, a third conducting strip and a second elastic piece, wherein the first conducting strip is connected with one end of the conductive winding, the second conducting strip is connected with the other end of the conductive winding, the first conducting strip and the second conducting strip are both connected with the shell of the external power line plug, the third conducting strip is close to the jack and is arranged, one end of the third conducting strip is hinged to the second conducting strip, and one end, far away from the second conducting strip, of the third conducting strip is matched with the first conducting strip.

Furthermore, the switching device adopts a normally closed microswitch, and a transmission element of the normally closed microswitch is matched with a power line plug of the server cabinet.

Furthermore, stop device is still including locating the first connecting plate of iron core lower extreme, locating the second connecting plate between limiting plate and the armature, locating the guide bar between first connecting plate and the second connecting plate, and first connecting plate is connected with the iron core, and the lower extreme and the first connecting plate of guide bar are connected, and limiting plate and armature all are connected with the second connecting plate, and the second connecting plate is equipped with and is used for and guide bar complex guiding hole, and the second connecting plate slides from top to bottom along the guide bar.

Furthermore, the lower extreme of guide bar is equipped with the external screw thread, and first connecting plate is equipped with and is used for the installation screw with the lower extreme complex of guide bar.

Furthermore, a dovetail groove used for being in sliding fit with the armature is arranged on the lower end face of the second connecting plate, a first fastening screw hole used for being matched with the first fastening piece and a second fastening screw hole used for being matched with the second fastening piece are arranged at the bottom of the dovetail groove, and the armature is arranged between the first fastening screw hole and the second fastening screw hole.

Furthermore, the second connecting plate is provided with a wiring hole.

A use method of a power line plug anti-pulling-out device of a server cabinet comprises the following steps:

(1) placing the limiting device in a reserved pit covered with a cover plate on the ground, wherein the limiting plate is matched with a position avoiding hole of the cover plate;

(2) the server cabinet is moved to the position above the limiting device, the power line plug of the server cabinet is inserted into the external power line plug, the switching device is changed from a normally closed state to a disconnected state, the conductive circuit is powered off, the armature is supported by the first elastic piece, the limiting plate penetrates out of the position avoiding hole of the cover plate, the limiting plate blocks wheels of the server cabinet, and the server cabinet is prevented from moving;

(3) the power line plug of the server cabinet is pulled out from the external power line plug, the switching device is changed into a normally closed state again, the conductive loop is electrified, the iron core provided with the conductive winding is magnetized, the armature is attracted by the magnetized iron core, the limiting plate moves downwards from the position avoiding hole of the cover plate, and the server cabinet is in a movable state.

Compared with the prior art, the invention has the beneficial effects that:

1. according to the invention, when the power line plug of the server cabinet is inserted into the external power line plug, the wheels of the server cabinet are blocked by the limiting plate, so that the server cabinet is in an immovable state, and the server cabinet can be in a movable state only by pulling the power line plug of the server cabinet off the external power line plug, thereby effectively preventing the power line plug of the server cabinet from being missed to be pulled out, and avoiding the damage of the power line plug of the server cabinet and the electric shock hazard.

2. Through setting up first conducting strip, second conducting strip, third conducting strip, second elastic component, make switching device simple structure, it is more simple and convenient nimble to switching device's operation.

3. Through adopting normal close formula micro-gap switch, can directly install normal close formula micro-gap switch on external power cord plug, need not to reform transform external power cord plug again, installation convenient to use.

4. Through setting up first connecting plate and second connecting plate, can save the materials of armature and iron core, reduce cost to through setting up the guide bar, can let the second connecting plate that carries armature can only slide from top to bottom along the guide bar, and can not rock in the horizontal direction, thereby improved the stability that the second connecting plate reciprocated at the guide bar, and then improved the stability that armature reciprocated.

5. Through set up the external screw thread at the lower extreme of guide bar, set up the installation screw on first connecting plate, can make the dismouting of guide bar and first connecting plate simple and convenient.

6. Through setting up the dovetail, with first fastener complex first fastening hole, with second fastener complex second fastening hole, can let armature receive the ascending holding power of the cell wall of dovetail in vertical direction, prevent that armature from dropping to let armature receive blockking of first fastener and second fastener on the sliding direction along the dovetail, prevent that armature from following the dovetail and slide, let the dismouting of second connecting plate and armature simple and convenient.

7. By providing the wiring holes on the second connecting plate, the winding wire used to form the conductive winding can be easily passed through.

Drawings

Fig. 1 is a first schematic structural diagram of a power plug anti-unplugging device of a server cabinet according to embodiment 1;

FIG. 2 is an enlarged view of a portion of FIG. 1A;

fig. 3 is a second schematic structural diagram of a power plug anti-unplugging device of a server cabinet in embodiment 1;

FIG. 4 is a partial enlarged view of FIG. 3B;

FIG. 5 is a first schematic structural view of a second connecting plate with an armature and a limiting plate;

FIG. 6 is a second schematic structural view of a second connection plate with an armature and a limiting plate;

fig. 7 is a first schematic structural diagram of a power plug anti-unplugging device of a server cabinet according to embodiment 2;

fig. 8 is a second schematic structural view of the device for preventing a power plug from being unplugged in a server rack according to embodiment 2.

In the figure:

1-a first connecting plate, 1-1-an installation screw hole, 2-a second connecting plate, 2-1-a guide hole, 2-2-a wiring hole, 2-3-a dovetail groove, 3-a guide rod, 4-a first elastic member, 5-an armature, 6-an iron core, 7-a winding wire, 8-a limiting plate, 9-a first fastener, 10-a second fastener, 11-an external power line plug, 11-1-a jack, 12-a server cabinet, 12-1-a power line plug, 12-2-a jack, 12-3-a wheel, 13-a first conductive sheet, 14-a second conductive sheet, 15-a third conductive sheet, 16-a second elastic member, 17-a reserved pit, 18-a cover plate, 18-1-auxiliary wiring hole, 18-2-avoiding hole, 19-normally closed microswitch and 19-1-transmission element.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example 1:

as shown in fig. 1 or fig. 3, a device for preventing a power line plug of a server cabinet from being unplugged includes a limiting device and a switch device.

As shown in fig. 1 or fig. 3, the limiting device includes a first connecting plate 1, a second connecting plate 2, a guide rod 3, a first elastic member 4, an armature 5, an iron core 6, a conductive winding, and a limiting plate 8.

As shown in fig. 1 or 3, the first connection plate 1 is provided with mounting screw holes 1-1. The lower end of the guide rod 3 is provided with an external thread which is in threaded fit with the mounting screw hole 1-1. Through the arrangement of the external threads and the installation screw holes 1-1, the guide rod 3 and the first connecting plate 1 can be conveniently disassembled and assembled.

As shown in fig. 5, the second connecting plate 2 is provided with a guide hole 2-1 for clearance-fitting with the guide rod 3, so that the second connecting plate 2 can only slide up and down along the guide rod 3 without shaking in the horizontal direction, thereby improving the up-and-down movement stability of the second connecting plate 2 carrying the armature 5 after the guide rod 3 and the guide hole 2-1 are arranged, and further improving the up-and-down movement stability of the armature 5. The second connecting plate 2 is provided with a wiring hole 2-2. The lower end face of the second connecting plate 2 is provided with a dovetail groove 2-3 which is used for being in sliding fit with the armature 5, and the bottom of the dovetail groove 2-3 is provided with a first fastening screw hole which is used for being matched with a first fastening piece 9 and a second fastening screw hole which is used for being matched with a second fastening piece 10. Specifically, the method comprises the following steps: the first fastening piece 9 and the second fastening piece 10 are both bolts or screws or threaded rods.

As shown in fig. 1 or 3, the first elastic member 4 is a spring.

As shown in fig. 1 or 3, the iron core 6 is fixedly mounted on the upper end surface of the first connection plate 1 by a fastener. This makes the attachment and detachment of the core 6 and the first connecting plate 1 easy.

As shown in fig. 1 or 3, the conductive winding is formed by winding a winding wire 7 around a core 6, and the winding wire 7 is a conductive metal wire having an insulating layer.

As shown in fig. 6, the limiting plate 8 is fixedly mounted on the upper end surface of the second connecting plate 2 through a fastener, specifically, the fastener adopts a bolt or a screw, and the limiting plate 8 and the second connecting plate 2 are fixedly mounted through the fastener, so that the limiting plate 8 and the second connecting plate 2 are easy and convenient to disassemble and assemble.

Assembling a limiting device:

(1) the second connecting plate 2 provided with the limiting plate 8 and the armature 5 are installed together: as shown in fig. 5, firstly, the armature 5 slides in along the dovetail groove 2-3 on the lower end surface of the second connecting plate 2, and the armature 5 slides between the first fastening screw hole and the second fastening screw hole on the groove bottom of the dovetail groove 2-3; the first fastening member 9 is then screwed into the first fastening screw hole and the second fastening member 10 is screwed into the second fastening screw hole. Therefore, in the vertical direction, the armature 5 is supported by the upward supporting force of the groove wall of the dovetail groove 2-3, so that the armature 5 is prevented from falling, the right side of the armature 5 is blocked by the first fastening piece 9, and the left side of the armature 5 is blocked by the second fastening piece 10, so that the armature 5 is prevented from sliding in the left-right direction, and the second connecting plate 2 and the armature 5 are installed together, so that the second connecting plate 2 and the armature 5 are more conveniently disassembled and assembled.

(2) The first connecting plate 1 with the iron core 6 mounted thereon is mounted together with the guide post 3: as shown in fig. 1 or 3, the lower end of the guide rod 3 is screwed into the mounting screw hole 1-1, so that the external thread of the lower end of the guide rod 3 is threadedly engaged with the mounting screw hole 1-1.

(3) As shown in fig. 1 or 3, the lower end of the first elastic member 4 is fixedly mounted on the upper end surface of the first connecting plate 1 by a fastener, so that the first elastic member 4 and the first connecting plate 1 can be conveniently disassembled; aligning a guide hole 2-1 on the second connecting plate 2 with a guide rod 3, and inserting the guide rod 3 into the guide hole 2-1; the upper end of the first elastic part 4 is fixedly arranged on the lower end face of the second connecting plate 2 through a fastening piece, so that the first elastic part 4 and the second connecting plate 2 are convenient to disassemble and assemble; the winding wire 7 is wound around the core 6, and both ends of the winding wire 7 are passed through the wire feeding holes 2-2 of the second connection plate 2 from below to above, so that the winding wire 7 for forming the conductive winding can be conveniently passed through by providing the wire feeding holes 2-2 on the second connection plate 2.

As shown in fig. 2 or fig. 4, the switch device is disposed in an inner cavity of a housing of the external power plug 11, a jack 11-1 is disposed on a side of the housing of the external power plug 11 close to a power plug 12-1 of the server cabinet 12, and the jack 11-1 is communicated with the inner cavity of the housing of the external power plug 11.

As shown in fig. 2 or fig. 4, the switch device includes a first conductive plate 13, a second conductive plate 14, a third conductive plate 15, and a second elastic member 16.

As shown in fig. 2 or 4, the first conductive plate 13 is connected to one end of the winding wire 7 for forming the conductive winding, the second conductive plate 14 is connected to the other end of the winding wire 7 for forming the conductive winding, both the first conductive plate 13 and the second conductive plate 14 are fixedly mounted on the housing of the external power plug 11 through fasteners, the third conductive plate 15 is disposed near the jack 11-1, the lower end of the third conductive plate 15 is hinged to the second conductive plate 14, and the upper end of the third conductive plate 15 is matched with the first conductive plate 13.

As shown in fig. 2 or fig. 4, the second elastic member 16 is also a spring, one end of the second elastic member 16 is connected to the third conductive plate 15 through a fastener, and one end of the second elastic member 16 away from the third conductive plate 15 is connected to one side of the housing of the external power plug 11 away from the power plug 12-1 of the server cabinet 12 through a fastener.

As shown in fig. 1 or 3, a power supply is connected in series to the winding wire 7 between the first conductive sheet 13 and the conductive winding. The switching device is connected in series with the power source and the conductive winding to form a conductive loop.

As shown in fig. 1, 2 or 3, the power plug 12-1 of the server cabinet 12 is provided with a plug rod 12-2 for mating with the jack 11-1 at a side close to the external power plug 11.

When in use:

(1) as shown in fig. 1 or fig. 3, the assembled limiting device is placed in a reserved pit 17 on the ground, a cover plate 18 is covered on the reserved pit 17, the winding wire 7 of the conductive winding penetrates out of an auxiliary wiring hole 18-1 of the cover plate 18, and a limiting plate 8 on the upper end surface of the second connecting plate 2 is matched with a clearance hole 18-1 of the cover plate 18.

(2) Before testing the server cabinet 12, as shown in fig. 2, a tester first inserts the power plug 12-1 of the server cabinet 12 into the external power plug 11 of the external power supply, so that the external power supply supplies power to the server cabinet 12. When the power line plug 12-1 of the server cabinet 12 is plugged into the plug of the external power line 11, the plug rod 12-2 on the power line plug 12-1 of the server cabinet 12 is inserted into the jack 11-1 of the external power line plug 11, and the inserting rod 12-2 is pressed against the third conducting plate 15, so that the third conducting plate 15 rotates anticlockwise around the hinge joint of the third conducting plate 15 and the second conducting plate 14, the upper end of the third conducting plate 15 leaves the first conducting plate 13, thereby breaking the first conductive plate 13 from the second conductive plate 14, de-energizing the conductive loop, passing no current through the conductive winding, the second connecting plate 2 moves upwards under the support of the first elastic element 4, so that the wheels 12-3 of the server cabinet 12 are blocked by the limiting plate 8 penetrating through the clearance hole 18-2 of the cover plate 18, and the server cabinet 12 is in a non-movable state.

(3) After the tester finishes testing the server cabinet 12, as shown in fig. 4, the tester pulls the power plug 12-1 of the server cabinet 12 off the external power plug 11, and after pulling the power plug 12-1 of the server cabinet 12 off, the insertion rod 12-2 on the power plug 12-1 of the server cabinet 12 is also pulled out from the insertion hole 11-1 on the external power plug 11, so that the third conductive plate 15 rotates clockwise around the hinge joint of the third conductive plate 15 and the second conductive plate 14 under the action of the second elastic member 16, and the upper end of the third conductive plate 15 contacts with the first conductive plate 13 again, so that the first conductive plate 13 and the second conductive plate 14 are communicated with each other through the third conductive plate 15, the conductive loop is in a power-on state, and current passes through the conductive winding, therefore, the iron core 6 is magnetized by the magnetic field of the conductive winding, the magnetized iron core 6 becomes a magnet, the armature 5 overcomes the elastic force of the first elastic piece 4 to move downwards under the action of the electromagnetic force, the armature 5 and the second connecting plate 2 are installed together, the second connecting plate 2 moves downwards along with the armature 5, the second connecting plate 2 and the limiting plate 8 are installed together, the limiting plate 8 moves downwards along with the second connecting plate 2, the limiting plate 8 is drawn downwards from the avoiding hole 18-1 in the cover plate 18, the wheels 12-3 of the server cabinet 12 are not blocked by the limiting plate 8 any more, and at the moment, the server cabinet 12 is in a movable state.

If the tester does not pull the power plug 12-1 of the server cabinet 12 off the external power plug 11, it is impossible to move the server cabinet 12 because the wheels 12-3 of the server cabinet 12 are always blocked by the limiting plate 8 before the power plug 12-1 of the server cabinet 12 is pulled off the external power plug 11, the server cabinet 12 is in the immovable state, and the server cabinet 12 can be in the movable state only by pulling off the power plug 12-1 of the server cabinet 12 off the external power plug 11.

Therefore, the device for preventing the power plug of the server cabinet from being unplugged in the embodiment 1 can effectively prevent the power plug 12-1 of the server cabinet 12 from being unplugged in a missing manner, thereby avoiding the damage to the power plug 12-1 of the server cabinet 12 and avoiding the electric shock hazard.

Example 2:

the embodiment 2 is the same as the embodiment 1, except that, as shown in fig. 7 or fig. 8, the switching device of the embodiment 2 directly adopts a normally closed microswitch 19, the normally closed microswitch 19 is the prior art, and the working principle of the normally closed microswitch 19 is that when an external force acts on a transmission element 19-1 of the normally closed microswitch 19, the normally closed microswitch 19 is in an off state, so that a conductive circuit is powered off; when the external force is removed, the normally closed microswitch 19 is in a normally closed state, so that the conductive loop is in a conductive communication state. Moreover, the plug 12-2 is not required to be arranged on the power line plug 12-1 of the server cabinet 12.

The normally closed type microswitch 19 is directly used, the installation is convenient, the normally closed type microswitch 19 is directly installed on the external power line plug 11 through a fastener, and the external power line plug 11 does not need to be reformed. The transmission element 19-1 of the normally closed microswitch 19 is matched with the power line plug 12-1 of the server cabinet 12.

When in use:

(1) before testing the server cabinet 12, as shown in fig. 7, a tester first inserts the power plug 12-1 of the server cabinet 12 into the external power plug 11 of the external power supply, so that the external power supply supplies power to the server cabinet 12. When the power line plug 12-1 of the server cabinet 12 is inserted into the external power line plug 11, the power line plug 12-1 of the server cabinet 12 presses the transmission element 19-1 of the normally closed microswitch 19, so that the normally closed microswitch 19 is in an off state, the conductive loop is powered off, no current passes through the conductive winding, the second connecting plate 2 moves upwards under the support of the first elastic part 4, the wheel 12-3 of the server cabinet 12 is blocked by the limiting plate 8 penetrating through the avoiding hole 18-2 of the cover plate 18, and the server cabinet 12 is in an immovable state.

(2) After the tester finishes testing the server cabinet 12, as shown in fig. 8, the tester pulls the power plug 12-1 of the server cabinet 12 off the external power plug 11, and after pulling the power plug 12-1 of the server cabinet 12 off, the power plug 12-1 of the server cabinet 12 and the transmission element 19-1 far away from the normally closed microswitch 19 make the normally closed microswitch 19 change from off state to normally closed state again, so that the conductive loop is in on state again, so that the current passes through the conductive winding, and the iron core 6 is magnetized by the magnetic field of the conductive winding, the magnetized iron core 6 becomes a magnet, so that the armature 5 overcomes the elastic force of the first elastic element 4 to move downwards under the action of the electromagnetic force, and because the armature 5 is installed with the second connecting plate 2, the second connecting plate 2 moves downwards along with the armature 5, because the second connecting plate 2 and the limiting plate 8 are installed together, the limiting plate 8 moves down together with the second connecting plate 2, so that the limiting plate 8 is drawn out downwards from the avoiding hole 18-2 on the cover plate 18, and the wheels 12-3 of the server cabinet 12 are not blocked by the limiting plate 8 any more, and at this time, the server cabinet 12 is in a movable state.

If the tester does not pull the power plug 12-1 of the server cabinet 12 off the external power plug 11, it is impossible to move the server cabinet 12 because the wheels 12-3 of the server cabinet 12 are always blocked by the limiting plate 8 before the power plug 12-1 of the server cabinet 12 is pulled off the external power plug 11, the server cabinet 12 is in the immovable state, and the server cabinet 12 can be in the movable state only by pulling off the power plug 12-1 of the server cabinet 12 off the external power plug 11.

Therefore, the device for preventing the power plug of the server cabinet from being unplugged in the embodiment 2 can also effectively prevent the power plug of the server cabinet 12 from being unplugged in a missing manner, so as to avoid the damage of the power plug 12-1 of the server cabinet 12 and avoid the electric shock hazard.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims (8)

1. The utility model provides a power cord plug anti-leakage device of server rack, its characterized in that, including stop device and be used for with external power cord plug connection's switching device, stop device includes power and limiting plate, armature, first elastic component, the iron core that is equipped with conductive winding that from the top down connects gradually, conductive winding establishes ties with power and switching device and forms electrically conductive return circuit, when the power cord plug of server rack and external power cord plug are pegged graft to cooperate, switching device becomes the off-state by the normally closed state.

2. The device of claim 1, wherein the housing of the external power plug is provided with a jack for engaging with a plug rod of the power plug of the server cabinet;

the switch device is arranged in a shell of the external power line plug and comprises a first conducting strip, a second conducting strip, a third conducting strip and a second elastic piece, wherein the first conducting strip is connected with one end of the conductive winding, the second conducting strip is connected with the other end of the conductive winding, the first conducting strip and the second conducting strip are both connected with the shell of the external power line plug, the third conducting strip is close to the jack and is arranged, one end of the third conducting strip is hinged to the second conducting strip, and one end, far away from the second conducting strip, of the third conducting strip is matched with the first conducting strip.

3. The device of claim 1, wherein the switch device is a normally closed microswitch, and a transmission element of the normally closed microswitch is engaged with the power plug of the server cabinet.

4. The device of claim 1, wherein the stop device further comprises a first connecting plate disposed at a lower end of the iron core, a second connecting plate disposed between the limiting plate and the armature, and a guide rod disposed between the first connecting plate and the second connecting plate, the first connecting plate is connected to the iron core, a lower end of the guide rod is connected to the first connecting plate, the limiting plate and the armature are both connected to the second connecting plate, the second connecting plate is provided with a guide hole for engaging with the guide rod, and the second connecting plate slides up and down along the guide rod.

5. The device for preventing the power plug of the server cabinet from being unplugged, as recited in claim 4, wherein the lower end of the guide bar is provided with an external thread, and the first connecting plate is provided with a mounting screw hole for engaging with the lower end of the guide bar.

6. The device for preventing the power cord plug of the server cabinet from being pulled out in the drawing of claim 4, wherein the lower end surface of the second connecting plate is provided with a dovetail groove for being in sliding fit with the armature, the bottom of the dovetail groove is provided with a first fastening screw hole for being matched with the first fastening piece and a second fastening screw hole for being matched with the second fastening piece, and the armature is arranged between the first fastening screw hole and the second fastening screw hole.

7. The device of claim 4, wherein the second connecting plate has a wire hole.

8. The method for using the anti-unplugging device for the power line plug of the server cabinet as claimed in any one of claims 1 to 7, comprising the following steps:

(1) placing the limiting device in a reserved pit covered with a cover plate on the ground, wherein the limiting plate is matched with a position avoiding hole of the cover plate;

(2) the server cabinet is moved to the position above the limiting device, the power line plug of the server cabinet is inserted into the external power line plug, the switching device is changed from a normally closed state to a disconnected state, the conductive circuit is powered off, the armature is supported by the first elastic piece, the limiting plate penetrates out of the position avoiding hole of the cover plate, the limiting plate blocks wheels of the server cabinet, and the server cabinet is prevented from moving;

(3) the power line plug of the server cabinet is pulled out from the external power line plug, the switching device is changed into a normally closed state again, the conductive loop is electrified, the iron core provided with the conductive winding is magnetized, the armature is attracted by the magnetized iron core, the limiting plate moves downwards from the position avoiding hole of the cover plate, and the server cabinet is in a movable state.

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