CN114883960A

CN114883960A - Safe grounding handcart

Info

Publication number: CN114883960A
Application number: CN202210555371.0A
Authority: CN
Inventors: 何海涛; 刘乐; 许志浩; 李文辉; 陈晓磊; 张静; 李涛; 董国峰; 王少博; 辛庆山; 冯华君; 吕琦; 单东阳; 孙玉杰; 韩楠; 贺鹏; 王明杰; 闫磊; 杨勇; 刘保安
Original assignee: State Grid Corp of China SGCC; Shijiazhuang Power Supply Co of State Grid Hebei Electric Power Co Ltd
Current assignee: State Grid Corp of China SGCC; Shijiazhuang Power Supply Co of State Grid Hebei Electric Power Co Ltd
Priority date: 2022-05-20
Filing date: 2022-05-20
Publication date: 2022-08-09

Abstract

The invention discloses a safe grounding handcart, which comprises a box body, an aviation plug arranged on the box body, a tulip contact fixedly arranged on one side of the box body, a conductor A electrically connected with the tulip contact, an electrified display locking device fixedly arranged on the other side of the box body and used for detecting whether a detection terminal or the conductor A in the aviation plug is electrified or not, a grounding electrode fixedly connected to the bottom of the box body, a conductor B electrically connected with the grounding electrode and a grounding switch arranged on the box body. The invention can carry out double electricity testing on the secondary wire and the primary wire of the switch cabinet, thereby improving the reliability of electricity testing and preventing accidental electric shock accidents.

Description

Safe grounding handcart

Technical Field

The invention relates to the technical field of power equipment maintenance equipment, in particular to a safe grounding handcart.

Background

At present, the electric power enterprise generally uses a high-voltage switch cabinet to supply and distribute electric power, the switch cabinet is classified according to functions, and the switch cabinet has an outgoing line switch cabinet, a main incoming switch cabinet, a bus coupler switch cabinet, a PT cabinet and the like, but the functions of bus grounding cannot be realized by all cabinets under the structural limitation and the safety consideration, so that when the bus is required to be subjected to power failure and grounding during maintenance work, a grounding handcart is required to be used for grounding.

At present, grounding handcarts produced by manufacturers mainly have two types. The first type is the combination of electricity testing handcart + grounding handcart, and when in use, the electricity testing handcart is pushed into the cabinet to test the electricity nonexistence, then the electricity testing handcart is pulled out, and the grounding handcart is pushed into the cabinet to realize grounding, so that the handcart has obvious defects: firstly, need test two handcart of electricity, ground connection and lead to equipment cost high, secondly need twice advance the car, go out the car and lead to the work load big. The second type is to test electricity ground connection handcart, and this type of handcart has integrateed and has tested electricity and ground connection function, even can realize testing two functions of electricity and ground connection with a handcart, and this type of handcart compares with first type of handcart and saves a handcart reduce the cost, reduces half income car, the work load of going out the car and has improved efficiency. For example, chinese patent CN204243592U, chinese patent CN107153134A, chinese patent CN104979770A and chinese patent CN107153134A respectively propose a novel grounding handcart with electricity testing and grounding functions, although the structures are different, there is a common problem: the handcart can not meet the transformer safety regulations in practical use: the requirement that a qualified contact electroscope with a corresponding voltage grade is required to be used in the process of electroscopy, namely the handcart uses a high-voltage live display device to replace the contact electroscope to conduct electroscopy which is contrary to safety requirements, so that the use of the grounding handcart is limited, and the grounding handcart is not safe enough in practice because serious misoperation of closing a grounding knife switch in a live state can be caused when a probe of the high-voltage live display device in the handcart drops off or the high-voltage live display device fails.

Disclosure of Invention

The invention aims to provide a safe grounding handcart to improve the safety and reliability of the grounding handcart.

In order to solve the technical problems, the technical scheme adopted by the invention is as follows:

a safe grounding handcart comprises a box body, an aviation plug arranged on the box body, a tulip contact fixedly arranged on one side of the box body, a conductor A electrically connected with the tulip contact, an electrified display locking device fixedly arranged on the other side of the box body and used for detecting whether a detection terminal or the conductor A in the aviation plug is electrified or not, a grounding electrode fixedly connected to the bottom of the box body, a conductor B electrically connected with the grounding electrode and a grounding switch arranged on the box body; the plum blossom contact, the conductor A, the conductor B and the grounding electrode are insulated from the box body, when the grounding switch is switched on, the conductor A and the conductor B are conducted, and when the grounding switch is switched off, the conductor A and the conductor B are disconnected; the aviation plug and the conductor A are electrically connected with the electrified display locking device; the fixed electromagnetism bolt that is provided with on the lateral wall of box, when aviation plug's detection terminal or conductor first electrified, the inserted bar of electromagnetism bolt stretches out outside the box.

Furthermore, an insulating cylinder transversely penetrates through and is fixedly arranged on one side of the box body, the outer end of the insulating cylinder is fixedly and electrically connected with the tulip contact, the conductor A is arranged along the inside of the insulating cylinder, one end, far away from the tulip contact, of the conductor A is fixedly and electrically connected with a moving contact of the grounding switch, the lower end of the conductor B is fixedly and electrically connected with a grounding electrode, and the upper end of the conductor B is electrically connected with the moving contact of the grounding switch.

Furthermore, the one end that the plum blossom contact was kept away from to the insulator cylinder is kept away from one side fixed connection of plum blossom contact with the box, the box is equipped with the manual work and tests the electric hole in the position that this side and insulator cylinder correspond.

Furthermore, be equipped with the door plant on the manual work electricity inspection hole, the box body is fixed on one side of the door plant and is provided with the electromagnetic lock that is used for locking the door plant or unblock, and when the conductor first was electrified, the electromagnetic lock locked the door plant.

Furthermore, the grounding switch is driven electrically, and a closing button and an opening button for controlling the grounding switch are arranged on the box body.

Furthermore, a position switching knob electrically connected with the grounding switch is arranged on the box body, and the position switching knob is provided with two gears which are an operation gear and a maintenance gear respectively; when the position switching knob is positioned at the operation gear, the switch-on button is pressed, the grounding switch is switched on, the switch-off button is pressed, and the grounding switch is switched off; when the position switching knob is located at the maintenance gear, the state of the grounding switch is locked.

Furthermore, an artificial electroless confirmation button is arranged on the box body and electrically connected with the grounding switch, after the artificial electroless confirmation button is switched on, the closing button is pressed, the grounding switch is switched on, the opening button is pressed, the grounding switch is switched off, and after the artificial electroless confirmation button is switched off, the state of the grounding switch is locked.

Furthermore, the box body is provided with an observation window for observing the working state of the internal grounding switch of the box body.

Furthermore, a chassis is arranged at the bottom of the box body, and the grounding electrode extends out of the bottom surface of the chassis.

Furthermore, wheels are arranged below the chassis, and a crank used for driving the box body to move is detachably connected to the chassis.

The invention has the positive effects that:

1. the invention is provided with the electrified display locking device, the aviation plug, the plum blossom plug and the conductor A, and can carry out double electricity testing on the secondary wire and the primary wire of the PT cabinet, thereby improving the reliability of electricity testing and preventing accidental electric shock accidents.

2. The invention is provided with the electromagnetic bolt, and when the secondary line is electrified, the inserted link of the electromagnetic bolt is ejected, so that the invention is prevented from being pushed into the PT cabinet, and accidental electric shock is prevented.

3. The invention is provided with the manual electricity testing hole, and the contact type electricity tester can be used for directly testing electricity of the primary line through the manual electricity testing hole, so that the electricity testing is more direct and accurate, and the electric shock accident caused by the fault of the electrified display locking device is prevented.

Drawings

FIG. 1 is a schematic structural view of example 1;

FIG. 2 is a right side view of FIG. 1;

FIG. 3 is a flowchart of the operation of example 1;

FIG. 4 is a schematic structural view of embodiment 1;

FIG. 5 is a right side view of FIG. 4;

FIG. 6 is a flowchart of the operation of example 2;

in the figure:

1. a tulip contact; 2. an insulating cylinder; 3. a conductor A; 4. a manual electroscopy hole; 5. an aviation plug; 6. a door panel; 7. a live display lockout device; 8. static contact; 9. an observation window; 10. a moving contact; 11. a wheel; 12. a handle; 13. a ground electrode; 14. a conductor B; 15. a box body; 16. an electromagnetic lock; 17. an electromagnetic bolt; 18. a crank socket; 19. a manual no-power confirmation button; 20. a closing button; 21. a brake separating button; 22. a position switching knob; 23. chassis, 24, earthing switch.

Detailed Description

The technical scheme of the invention is clearly and completely described below with reference to the accompanying drawings. It is to be understood that the embodiments described are only a few examples of the present application and not all examples. The following description of the embodiments is merely illustrative in nature and is in no way intended to limit the application, its application, or uses. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments in the present application, are within the scope of protection of the present application.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

The relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in the embodiments do not limit the scope of the present application unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

In the description of the present application, it is to be understood that the orientation or positional relationship indicated by the directional terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc., are generally based on the orientation or positional relationship shown in the drawings, and are used for convenience of description and simplicity of description only, and in the case of not making a reverse description, these directional terms do not indicate and imply that the device or element being referred to must have a particular orientation or be constructed and operated in a particular orientation, and therefore, should not be considered as limiting the scope of the present application; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.

Spatially relative terms, such as "above … …," "above … …," "above … … surface," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and the terms have no special meanings unless otherwise stated, and therefore, the scope of protection of the present application is not to be construed as being limited.

The present invention will be further explained and illustrated with reference to the following specific embodiments and the accompanying drawings, wherein the following embodiments are only preferred embodiments, not all embodiments, and should not be construed as limiting the scope of the present invention.

Example 1

As shown in fig. 1 and 2, a safe grounding handcart comprises a rectangular box body 15, an aviation plug 5 arranged on the top surface of the box body 15, a tulip contact 1 fixedly arranged on one side of the box body 15, a conductor a 3 electrically connected with the tulip contact 1, an electrified display locking device 7 fixedly arranged on the other side of the box body 15 and used for detecting whether a detection terminal or the conductor a 3 in the aviation plug 5 is electrified or not, a grounding electrode 13 fixedly connected to the bottom of the box body 15, a conductor b 14 electrically connected with the grounding electrode 13 and a grounding switch 24 arranged on the box body 15; plum blossom contact 1, conductor first 3, conductor second 14 and earthing pole 13 all are insulating with box 15, when earthing switch 24 closed, conductor first 3 and conductor second 14 switched on, when earthing switch 24 separated, conductor first 3 and conductor second 14 disconnection. The aviation plug 5 and the conductor A3 are electrically connected with an electrified display locking device 7; all fixed being provided with electromagnetism bolt 17 on the lateral wall of box 15 both sides, when aviation plug 5's detection terminal or conductor first 3 electrified, outside box 15 was stretched out to electromagnetism bolt 17's inserted bar, under the blockking of inserted bar, box 15 can not pushed the PT cabinet to prevent unexpected electric shock.

The left side of box 15 transversely runs through fixedly being provided with insulating cylinder 2, box 15 external fixation is provided with the stand that is used for supporting insulating cylinder 2. The left end of insulating cylinder 2 is connected with plum blossom contact 1 fixed electricity, conductor first 3 sets up along insulating cylinder 2 is inside, 3 right-hand members of conductor first bends downwards and stretches out insulating cylinder 2. The grounding switch 24 is fixedly connected to the left side wall in the box body 15, the bottom of the conductor A3 is fixedly and electrically connected with the moving contact 10 of the grounding switch 24, the lower end of the conductor B14 is fixedly and electrically connected with the grounding electrode 13, and the upper end of the conductor B14 is electrically connected with the moving contact 10 of the grounding switch 24.

The wrench on the grounding switch 24 is located outside the box body 15, and the grounding switch 24 can be closed or separated by pulling the wrench.

The detection terminal on the aviation plug 5 is electrically connected with the live display locking device 7 through a flexible wire, and the conductor A3 and the live display locking device 7 are also electrically connected with the live display locking device 7 through a flexible wire. The aviation plug 5 is also provided with a power taking terminal.

Because the power is three-phase, so plum blossom contact 1, insulating cylinder 2, conductor first 3 are corresponding three respectively.

And an observation window 9 for observing the working state of the grounding switch 24 is arranged on the right side of the box body 15.

The bottom of the box body 15 is provided with a chassis 23, the box body 15 and the chassis 23 are connected through a dovetail sliding table in a sliding manner, the grounding electrode 13 extends out of the bottom surface of the chassis 23, and a strip-shaped hole is formed in the position, corresponding to the grounding electrode 13, on the chassis 23, so that the box body 15 and the chassis 23 can slide relatively without interference. Wheels 11 are arranged below the chassis 23, and a handle 12 is arranged on the right side of the chassis 23. The chassis 23 is connected with a lead screw in a rotating mode, the box body 15 is fixedly connected with a nut, the direction of the lead screw is consistent with the direction of the dovetail sliding table, one end of the lead screw is fixedly provided with a crank socket 18, and a rectangular blind hole is formed in the crank socket 18. After the crank is inserted into the blind hole of the crank socket 18, the crank is shaken to drive the screw rod to rotate, and further drive the nut and the box body 15 to slide along the chassis 23.

As shown in fig. 3, the process of using the present invention is:

the first step is that the aviation plug 5 is in butt joint with a corresponding socket on the PT cabinet, at the moment, a secondary wire on the PT cabinet is electrically connected with a detection terminal of the aviation plug 5 through the socket, and the socket of a power taking terminal of the aviation plug 5 obtains a power supply to supply power for the electrified display locking device 7 and the electromagnetic plug 17.

And step two, if the secondary coil in the PT cabinet is electrified, the electrified display locking device 7 gives out audible and visual alarm to indicate that the PT cabinet is electrified, and meanwhile, the electrified display locking device 7 controls the two electromagnetic bolts 17 to enable the coil of the electromagnetic bolts 17 to be electrified, so that the inserted rod of the electromagnetic bolts 17 extends out of the box body 15, the box body 15 of the PT cabinet cannot be pushed into the PT cabinet, the electricity testing work is finished, and the electrified reason is searched. If the secondary coil is not electrified, the next step is carried out.

And step three, pushing the invention into the PT cabinet, inserting the crank into the crank socket 18, then shaking the crank to move the box body 15, and respectively inserting the three tulip contacts 1 into corresponding sockets on a primary wire in the PT cabinet.

If the primary line is electrified, the electrified display locking device 7 gives out sound-light alarm to indicate that the electricity is dangerous, the electricity testing work is finished, and the reason of electrification is searched; if the primary wire is not electrified, the next step is carried out.

Step five, closing the grounding switch 24 and carrying out maintenance operation on the PT cabinet;

and step six, after the maintenance is finished, the grounding switch 24 is separated, the crank is shaken to separate the tulip contact 1 from the primary wire, and then the PT cabinet is pulled out.

The invention can carry out double electricity testing on the primary wire and the secondary wire during maintenance, thereby improving the reliability of electricity testing and preventing accidental electric shock accidents.

Example 2

As shown in fig. 4 and 5, the present embodiment is different from embodiment 1 in that:

insulating cylinder 2 extends right and with box 15 right side fixed connection, the right-hand member of insulating cylinder 2 is uncovered, box 15 is equipped with the manual work and tests electric hole 4 in the position that right side and insulating cylinder 2 correspond. Be equipped with on the manual work electroscope hole 4 with box 15 articulated door plant 6, box 15 right side is fixed being provided with the electromagnetic lock 16 that is used for locking or unblock door plant 6 beside door plant 6, and when conductor first 3 was electrified, electromagnetic lock 16 locked door plant 6.

The grounding switch 24 is driven electrically, the grounding switch 24 is provided with a closing coil and an opening coil, and the box body 15 is provided with a closing button 20 and an opening button 21 for controlling the closing coil and the opening coil respectively.

A position switching knob 22 electrically connected with a grounding switch 24 is arranged on the box body 15, and the position switching knob 22 is provided with two gears which are an operation gear and a maintenance gear respectively; when the position switching knob 22 is in the operating position, the closing button 20 is pressed, the grounding switch 24 is closed, the opening button 21 is pressed, and the grounding switch 24 is opened. When the position switching knob 22 is in the service range, the state of the earthing switch 24 is locked.

The box body 15 is provided with an artificial electroless confirmation button 19, the artificial electroless confirmation button 19 is electrically connected with a closing coil of the grounding switch 24, after the artificial electroless confirmation button 19 is conducted, the closing button 20 is pressed, the grounding switch 24 is closed, the opening button 21 is pressed, the grounding switch 24 is separated, and after the artificial electroless confirmation button 19 is disconnected, the state of the grounding switch 24 is locked.

As shown in fig. 6, the process of using the present invention is:

And step two, if the secondary coil in the PT cabinet is electrified, the electrified display locking device 7 gives out sound and light alarm to indicate that the PT cabinet is electrified, and meanwhile, the electrified display locking device 7 controls the two electromagnetic bolts 17 to enable the coil of the electromagnetic bolt 17 to be electrified, so that the inserted rod of the electromagnetic bolt 17 extends out of the box body 15, the box body 15 of the PT cabinet cannot be pushed into the PT cabinet, and the work is finished. If the secondary coil is not electrified, the next step is carried out.

Step four, the position switching knob is turned to an operation gear, if a primary line is electrified, the electrified display locking device 7 gives out sound and light alarm to indicate that the electricity is dangerous, the electromagnetic lock 16 keeps locking the door panel 6, and the work is finished; if the primary wire is not electrified, the next step is carried out.

And step five, unlocking the electromagnetic lock 16 and manually opening the door plate.

And step six, a contact electroscope is manually used for electroscopy the conductor A3 from the manual electroscopy hole 4, whether the conductor A3 is electrified or not is detected, if the conductor A3 is electrified, the condition that the electricity is dangerous is indicated, the electroscopy work is finished, and the reason of electrification is searched.

And step five, if the conductor A3 is not electrified as proved by manual electricity test, pressing the non-electricity confirmation button 19, and then closing the grounding switch 24.

Step six, the position switching knob 22 is turned to an overhaul gear, and when the opening button 21 is pressed at the moment, the grounding switch 24 does not act, so that the grounding switch 24 is prevented from being disconnected due to misoperation, and then the PT cabinet is overhauled;

and step six, after the maintenance is finished, the switching knob 22 is turned to an operation gear, then the opening button 21 is pressed, the grounding switch 24 is separated, the crank is shaken to separate the tulip contact 1 from the primary wire, and then the PT cabinet is pulled out.

The contact electroscope is used for directly testing the primary line through the manual electroscope hole 4, so that the electroscope is more direct, and the electric shock accident caused by the fault of the electrified display locking device 7 is prevented.

Example 3

The present embodiment is different from embodiment 2 in that:

an illuminating lamp is arranged in the box body 15, so that the working state of the grounding switch 24 can be observed from the observation window 9 more easily.

The above-mentioned embodiments are described in detail and specifically for the purpose of illustrating the technical ideas and features of the present invention, and it is an object of the present invention to enable those skilled in the art to understand the contents of the present invention and to implement the same, but not to limit the present invention only by the embodiments, and it is not limited to the scope of the present invention, i.e. equivalent changes or modifications made within the spirit of the present invention, and it is within the scope of the present invention for those skilled in the art to make local modifications within the system and changes or modifications between subsystems without departing from the structure of the present invention. At present, the technical scheme of the application has been subjected to pilot plant test, namely small-scale experiment before large-scale mass production of products; after the pilot plant test is finished, the use investigation of users is developed in a small range, and the investigation result shows that the user satisfaction is higher, so that the preparation of products for formal production is already carried out for industrialization.

Claims

1. A safe grounding handcart is characterized by comprising a box body (15), an aviation plug (5) arranged on the box body (15), a tulip contact (1) fixedly arranged on one side of the box body (15), a conductor A (3) electrically connected with the tulip contact (1), an electrified display locking device (7) fixedly arranged on the other side of the box body (15) and used for detecting whether a detection terminal or the conductor A (3) in the aviation plug (5) is electrified or not, a grounding electrode (13) fixedly connected to the bottom of the box body (15), a conductor B (14) electrically connected with the grounding electrode (13) and a grounding switch (24) arranged on the box body (15); the plum blossom contact (1), the conductor A (3), the conductor B (14) and the grounding electrode (13) are insulated from the box body (15), when the grounding switch (24) is closed, the conductor A (3) and the conductor B (14) are conducted, and when the grounding switch (24) is separated, the conductor A (3) and the conductor B (14) are disconnected; the aviation plug (5) and the conductor A (3) are electrically connected with the electrified display locking device (7); the fixed electromagnetism bolt (17) that is provided with on the lateral wall of box (15), when the detection terminal of aviation plug (5) or conductor first (3) were electrified, the inserted bar of electromagnetism bolt (17) stretched out outside box (15).

2. The safe grounding handcart according to claim 1, wherein an insulating cylinder (2) is transversely arranged on one side of the box body (15) in a penetrating and fixing mode, the outer end of the insulating cylinder (2) is fixedly and electrically connected with the tulip contact (1), the conductor A (3) is arranged along the inside of the insulating cylinder (2), one end, far away from the tulip contact (1), of the conductor A (3) is fixedly and electrically connected with a moving contact (10) of the grounding switch (24), the lower end of the conductor B (14) is fixedly and electrically connected with the grounding electrode (13), and the upper end of the conductor B (14) is electrically connected with the moving contact (10) of the grounding switch (24).

3. The safe grounding handcart according to claim 2, wherein one end of the insulating cylinder (2) far away from the tulip contact (1) is fixedly connected with one side of the box body (15) far away from the tulip contact (1), and the box body (15) is provided with a manual electricity testing hole (4) at a position corresponding to the insulating cylinder (2).

4. The safe grounding handcart according to claim 3, wherein a door plate (6) is arranged on the manual electricity testing hole (4), an electromagnetic lock (16) used for locking or unlocking the door plate (6) is fixedly arranged beside the door plate (6) outside the box body (15), and when the conductor A (3) is electrified, the door plate (6) is locked by the electromagnetic lock (16).

5. The safe grounding handcart according to claim 4, characterized in that the grounding switch (24) is driven electrically, and the box body (15) is provided with a closing button (20) and an opening button (21) for controlling the grounding switch (24).

6. The safe grounding handcart according to claim 5, characterized in that the box body (15) is provided with a position switching knob (22) electrically connected with a grounding switch (24), and the position switching knob (22) is provided with two gears, namely an operation gear and an overhaul gear; when the position switching knob (22) is positioned at an operation gear, the closing button (20) is pressed, the grounding switch (24) is closed, the opening button (21) is pressed, and the grounding switch (24) is opened; when the position switching knob (22) is located at the service position, the state of the grounding switch (24) is locked.

7. The safe grounding handcart according to claim 6, wherein an artificial non-electricity confirmation button (19) is arranged on the box body (15), the artificial non-electricity confirmation button (19) is electrically connected with the grounding switch (24), after the artificial non-electricity confirmation button (19) is conducted, the closing button (20) is pressed, the grounding switch (24) is closed, the opening button (21) is pressed, the grounding switch (24) is separated, and after the artificial non-electricity confirmation button (19) is disconnected, the state of the grounding switch (24) is locked.

8. The safe grounding handcart according to claim 1, characterized in that the box body (15) is provided with an observation window (9) for observing the working state of the grounding switch (24) therein.

9. The safe grounding handcart according to claim 1, wherein a chassis (23) is arranged at the bottom of the box body (15), and the grounding electrode (13) protrudes out of the bottom surface of the chassis (23).

10. The safe grounding handcart according to claim 9, characterized in that wheels (11) are arranged under the chassis (23), and a crank for driving the box body (15) to move is detachably connected to the chassis (23).