Multifunctional arc extinguishing device for live working

By designing fixed components and arc suppression units for multi-function arc suppression devices for live operations, the existing equipment is not compatible with multiple line types and has arc safety hazards, and rapid and safe arc processing and operation efficiency improvement are achieved.

CN119231204APending Publication Date: 2024-12-31YUNNAN POWER GRID CO LTD KUNMING POWER SUPPLY BUREAU
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Patent Information

Application Number
CN202411199092.0
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-08-29
Publication Date
2024-12-31

AI Technical Summary

Technical Problem

Existing arc suppression equipment cannot meet the needs of single-straight wire clips, palm-type wire clips and winding fire-type wire clips, and when overlapping the drain wire, arcs are easily generated due to the influence of induction capacitors and current, which poses safety hazards.

Method used

A multi-functional arc decompression device for live operations is designed, including a driving unit, a fixed unit and an arc decompression unit. Through the coordinated work of the fixed component and the arc decompression component, a rapid and safe arc decompression and arc decompression processing are achieved to avoid the operator's direct operation. Contact the live part.

Benefits of technology

The device is compatible with a variety of clamps and line types, simplifies the installation process, significantly reduces the risk of electric shock, improves operating speed and safety, and enhances the efficiency and safety of live operations.

✦ Generated by Eureka AI based on patent content.

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Abstract

The invention discloses a multifunctional arc extinguishing device for hot-line work, and relates to the technical field of auxiliary tools for hot-line work, and the device comprises a driving unit which comprises a housing, a control button disposed on the housing, a power supply disposed at the bottom of the control button, and a control panel disposed in the housing. According to the multifunctional arc extinguishing device for live working, through the adaptive design of the fixing unit, the multifunctional arc extinguishing device can be compatible with various wire clamps and line types, the installation process is simplified, and the operation convenience is improved. The remote control fixing function of the device effectively prevents an operator from directly contacting an electrified part, the electric shock risk is remarkably reduced, in addition, the fixing assembly and the arc extinguishing unit of the device work cooperatively, rapid and safe arc drainage and arc extinguishing treatment are achieved, the operation speed is increased, the operation safety is further ensured, and the working efficiency is improved. Therefore, the live working efficiency is improved, and the working safety is greatly enhanced at the same time.
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Description

Technical Field

[0001] The invention relates to the technical field of live working auxiliary tools, and in particular to a multifunctional arc extinguishing device for live working. Background Art

[0002] With the continuous progress of society and the rapid development of science and technology, power equipment has become more and more important in daily life. However, various defects and hidden dangers will appear in power equipment during long-term operation, and these problems need to be eliminated by power outages, power testing and installation of grounding wires. However, large-scale power outages do not meet people's demand for continuous power supply, so live working has become an important means to solve this problem.

[0003] The existing arc extinguishing equipment is mainly suitable for double parallel groove line clamp fire-breaking lines. It cannot meet the needs of other types of lines such as single parallel groove line clamps, palm-type line clamps and winding-type fire-breaking lines, and a temporary drain line needs to be connected first. However, when connecting the drain line, due to the influence of induced capacitance and current, electric arcs are easily generated, which is not conducive to safe operation. Traditionally, an insulating operating rod is used to directly connect the drain line to the main line. Due to the use of the operating rod, the point where the arc is generated is a certain distance away from the operator, but due to the slow connection speed of the manually operated insulating operating rod, the corresponding arc generated is also larger. At the same time, the arc cannot be eliminated, and there is still a large safety hazard. Summary of the invention

[0004] In view of the above-mentioned problems existing in the existing multifunctional arc extinguishing device for live working, the present invention is proposed.

[0005] Therefore, the present invention provides a multifunctional arc extinguishing device for live working, the purpose of which is to solve the problem that other types of lines such as single parallel groove line clamps, palm-type line clamps and winding-type spark-connecting lines cannot meet the needs, and a temporary drain line needs to be overlapped first. However, when overlapping the drain line, due to the influence of induced capacitance and current, an arc is easily generated, which is not conducive to safe operation. Traditionally, an insulating operating rod is used to directly overlap the drain line on the main conductor. Due to the use of the operating rod, the point where the arc is generated is a certain distance away from the operator, but due to the slow overlapping speed of the manually operated insulating operating rod, the correspondingly generated arc is also larger. At the same time, the arc cannot be eliminated, and there is still a large safety hazard.

[0006] To solve the above technical problems, the present invention provides the following technical solutions: a driving unit, comprising a control button disposed on the housing, a power source disposed at the bottom of the control button, and a control board disposed inside the housing;

[0007] A fixing unit, comprising a fixing assembly arranged at one side of the housing, a main clamping assembly arranged at the top of the fixing assembly, a secondary clamping assembly arranged at the bottom of the fixing assembly, and a connecting rotating shaft arranged at the bottom of the fixing assembly;

[0008] The arc extinguishing unit comprises an arc extinguishing component arranged at the bottom of the fixing component and a flow guide component arranged inside the arc extinguishing component.

[0009] As a preferred solution of the multifunctional arc extinguishing device for live working described in the present invention, wherein: the fixed component includes a fixed main board arranged on one side of the outer shell, a matching buckle arranged on the fixed main board, a guide plate arranged at the bottom of the fixed main board, and a support plate arranged at the bottom of the fixed main board.

[0010] As a preferred solution of the multifunctional arc extinguishing device for live working described in the present invention, the main clamping assembly includes a top shell arranged on the top of the fixed main board, a rotating motor arranged inside the top shell, and a spiral rod slidably arranged inside the rotating motor.

[0011] As a preferred solution of the multifunctional arc extinguishing device for live working described in the present invention, a fixing block is provided at the bottom of the spiral rod 1, an extrusion buckle 1 is provided at the bottom of the fixing block, and the extrusion buckle 1 cooperates with the mating buckle.

[0012] As a preferred solution of the multifunctional arc extinguishing device for live working of the present invention, a rotating handle is provided on the top of the support plate.

[0013] As a preferred solution of the multifunctional arc extinguishing device for live working described in the present invention, wherein: the auxiliary clamping assembly includes a low shell arranged at the bottom of the fixed main board, a rotating motor 2 arranged inside the low shell, a spiral rod 2 arranged inside the rotating motor 2, and an extrusion buckle 2 arranged at one end of the spiral rod 2, and the extrusion buckle 2 cooperates with the mating buckle.

[0014] As a preferred solution of the multifunctional arc extinguishing device for live working of the present invention, a rotating handle 2 is arranged at the other end of the spiral rod 2.

[0015] As a preferred solution of the multifunctional arc extinguishing device for live working described in the present invention, the arc extinguishing assembly includes a guide block rotatably arranged on the connecting rotating shaft, an operating rod arranged on the guide block, a low ring arranged at the bottom of the operating rod, and a contact rod slidably arranged inside the operating rod.

[0016] As a preferred solution of the multifunctional arc extinguishing device for live working of the present invention, a pull rod is arranged at the bottom of the contact rod, a reset spring is arranged on the outer diameter of the pull rod, and the reset spring is connected to the contact rod.

[0017] As a preferred solution of the multifunctional arc extinguishing device for live working of the present invention, the guide assembly includes a contact block arranged on the operating rod, and a guide wire arranged on the contact block, and the contact block cooperates with the contact rod.

[0018] Beneficial effects of the present invention: The multifunctional arc extinguishing device for live working of the present invention can be compatible with a variety of wire clamps and line types through the adaptive design of the fixing unit, which simplifies the installation process and improves the convenience of operation. Its remote control fixing function effectively avoids the operator from directly contacting the live parts, significantly reducing the risk of electric shock. In addition, the fixing components and arc extinguishing units of the device work together to achieve fast and safe arc diversion and arc extinguishing processing, improve the operation speed and further ensure the safety of the operation, thereby greatly enhancing the safety of the operation while improving the efficiency of live working. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0020] Figure 1 It is a schematic diagram of the overall structure of the multifunctional arc extinguishing device for live working of the present invention.

[0021] Figure 2 It is a schematic diagram of the structure of the wire clamp assembly of the multifunctional arc extinguishing device for live working of the present invention.

[0022] Figure 3 It is a schematic diagram of the cross-sectional structure of the wire clamp assembly of the multifunctional arc extinguishing device for live working of the present invention.

[0023] Figure 4 It is a schematic diagram of the structure of the arc extinguishing component of the multifunctional arc extinguishing device for live working of the present invention.

[0024] Figure 5 It is a schematic diagram of the internal structure of the arc extinguishing component of the multifunctional arc extinguishing device for live working of the present invention.

[0025] Figure 6 It is a schematic diagram of the cross-sectional structure of the arc extinguishing component of the multifunctional arc extinguishing device for live working of the present invention. DETAILED DESCRIPTION

[0026] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings.

[0027] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0028] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor is it an embodiment that is mutually exclusive with other embodiments, either individually or selectively.

[0029] Secondly, the present invention is described in detail with reference to the schematic diagram. When describing the embodiments of the present invention in detail, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0030] Example 1, reference Figure 1 - Figure 2 , which is the first embodiment of the present invention, provides a multifunctional arc extinguishing device for live working, the device comprising: a driving unit 100, comprising a housing 101, a control button 102 arranged on the housing 101, a power supply 103 arranged at the bottom of the control button 102, and a control board 104 arranged inside the housing 101, the power supply 103 inside the driving unit 100 supplies energy to the whole, and the control button 102 enables the control board 104 to control the fixing unit 200 to fix the cable;

[0031] The fixing unit 200 includes a fixing component 201 disposed on one side of the housing 101, a main clamping component 202 disposed on the top of the fixing component 201, a secondary clamping component 203 disposed on the bottom of the fixing component 201, and a connecting rotating shaft 204 disposed on the bottom of the fixing component 201. The main clamping component 202 and the secondary clamping component 203 on the fixing component 201 cooperate to clamp and fix a variety of different cables.

[0032] The arc extinguishing unit 300 includes an arc extinguishing component 301 arranged at the bottom of the fixed component 201, and a guide component 302 arranged inside the arc extinguishing component 301. The arc extinguishing component 301 at the bottom of the fixed component 201 cooperates with the guide component 302 to divert the current and perform arc extinguishing.

[0033] Among them, the fixing component 201 includes a fixing main board 201a arranged on one side of the outer shell 101, a matching buckle 201b arranged on the fixing main board 201a, a guide plate 201d arranged at the bottom of the fixing main board 201a, and a support plate 201c arranged at the bottom of the fixing main board 201a. The matching buckle 201b on the outer shell 101 can cooperate with the main clamping component 202 and the auxiliary clamping component 203 so that a variety of different cables can be clamped and fixed.

[0034] During use, when the cable is fixed and installed, the operator can wrap different double parallel groove wire clamps for the spark-connecting lines. For single parallel groove wire clamps, palm-type wire clamps and winding-type spark-connecting lines, they can all be wound on the fixing component 201, and the pull rod 301d on the arc extinguishing component 301 is pulled to cut off the current first, and then the fixing main board 201a on the fixing component 201 and the card slot of the matching buckle 201b are used to cooperate with the main clamping component 202 and the auxiliary clamping component 203 to fix the wire clamps at different angles, and the spiral rod 202c and the screw on the main clamping component 202 and the auxiliary clamping component 203 can be controlled by the control shell 101. The second rotary rod 203c moves to fix the cable inside the slot, avoiding the operator's need to install it manually, increasing practicality, and after the cable is installed and fixed, the pull rod 301d is released to make the internal contact rod 301e contact the guide block 301b, and the current on the equipment begins to be guided. The current is guided out through the guide component 302 to extinguish the arc, avoiding the operator from directly connecting 302d to the main conductor. Due to the use of the operating rod 301a, the point where the arc is generated is a certain distance away from the operator, but due to the slow speed of manually operating the insulating operating rod 301a, the corresponding arc generated is also larger, which creates a danger.

[0035] The multifunctional arc extinguishing device for live working of the present invention realizes universal fixation of various types of wire clamps through its innovative design, simplifies the operation process, and improves the safety and efficiency of the operation. The fixing component 201 of the device allows winding and fixing at multiple angles, and the remote control operation reduces the need for operators to directly contact the live parts. The automatic control function of the spiral rod further simplifies the cable fixing process. In addition, through the pull rod operation of the arc extinguishing component 301, the current is quickly disconnected and diverted, and the diversion component 302 is used to effectively extinguish the arc, reducing the arc risk caused by manual operation. Overall, the present invention significantly improves the safety and efficiency of live working through automation and remote control technology, while reducing the complexity and potential dangers of manual operation.

[0036] Example 2, reference Figure 1 - Figure 3, which is the second embodiment of the present invention. This embodiment is different from the first embodiment in that: a main clamping assembly 202 includes a top shell 202a arranged on the top of the fixed mainboard 201a, a rotating motor 202b arranged inside the top shell 202a, and a spiral rod 202c slidably arranged inside the rotating motor 202b. The main clamping assembly 202 can be used to fix and connect the cable placed in the card slot.

[0037] Compared with Example 1, further, a fixing block 202e is provided at the bottom of the spiral rod 202c, and an extrusion buckle 202f is provided at the bottom of the fixing block 202e, and the extrusion buckle 202f cooperates with the matching buckle 201b, and the spiral rod 202c is used to extrude and fix the cable with the fixing block 202e and the extrusion buckle 202f.

[0038] Furthermore, a rotating handle 202d is provided on the top of the support plate 201c, and the rotating handle 202d is used to manually fix and install the drive unit 100 when it has no power.

[0039] Furthermore, the auxiliary clamping assembly 203 includes a low shell 203a arranged at the bottom of the fixed main board 201a, a rotating motor 203b arranged inside the low shell 203a, a spiral rod 203c arranged inside the rotating motor 203b, and an extrusion buckle 203e arranged at one end of the spiral rod 203c, and the extrusion buckle 203e cooperates with the matching buckle 201b. Through the cooperation between the auxiliary clamping assembly 203 and the main clamping assembly 202 and the matching buckle 201b, different double parallel groove wire clamps can be used for spark-connecting lines, and single parallel groove wire clamps, palm-type wire clamps and winding type spark-connecting lines can all be fixedly installed.

[0040] Furthermore, a rotating handle 203d is provided at the other end of the spiral rod 203c, and the spiral rod 203c can be rotated by rotating the handle 203d to squeeze the buckle 203e to fix the cable.

[0041] During use, when fixing the cable, different cables and wire clamps are placed inside the card slot, and the control button 102 on the drive unit 100 is used to rotate the rotating motor 1 202b inside the top shell 202a so that the spiral rod 1 202c moves downward with the fixing block 202e and the extruding buckle 1 202f, and the top cable is fixed and installed with the cooperation of the matching buckle 201b. At the same time, the rotating motor 203b at the bottom is also controlled by the control button 102 to make the rotating motor 203b work so that the spiral rod 203c moves with the extruding buckle 203e to fix the bottom cable with the cooperation of the matching buckle 201b. At the same time, the card slot shape on the extruding buckle 1 202f and the extruding buckle 20 The card slot shape of 3e cooperates with the matching buckle 201b to make it possible to connect different double parallel groove wire clamps to the spark-connecting lines. It can fix and install single parallel groove wire clamps, palm-type wire clamps and winding-type spark-connecting lines, and can also be installed in a circle, and the wire clamp installation can be freely adjusted. When the power supply 103 has no power, the top spiral rod 202c can be rotated by turning the rotating handle 202d to continue working, and the spiral rod 203c can be made to work by turning the rotating handle 203d at the bottom, thereby preventing the problem of the equipment being unusable when there is no power. It can effectively simplify the installation process and improve the convenience of operation. Its remote control fixing function effectively avoids direct contact between the operator and the live parts, significantly reducing the risk of electric shock.

[0042] The remaining structures are the same as those of Example 1.

[0043] Example 3, reference Figure 1 - Figure 6 , which is the third embodiment of the present invention. This embodiment is different from the second embodiment in that the arc extinguishing component 301 includes a guide block 301b rotatably arranged on the connecting rotating shaft 204, an operating rod 301a arranged on the guide block 301b, a low ring 301c arranged at the bottom of the operating rod 301a, and a contact rod 301e slidably arranged inside the operating rod 301a. The arc extinguishing component 301 is connected to the fixed component 201, so that the cable on the fixed component 201 can be arc extinguished and drained to prevent arc from injuring people.

[0044] Compared with Example 2, further, a pull rod 301d is provided at the bottom of the contact rod 301e, and a reset spring 301f is provided on the outer diameter of the pull rod 301d, and the reset spring 301f is connected to the contact rod 301e. The contact rod 301e is separated from the guide block 301b by pulling the pull rod 301d. After the operator completes the fixed installation of the cable, the pull rod 301d is released, and the contact rod 301e returns to its original position under the action of the reset spring 301f, contacts the guide block 301b, and starts to guide and extinguish the arc.

[0045] Furthermore, the guide assembly 302 includes a contact block 302a arranged on the operating rod 301a, and a guide wire 302b arranged on the contact block 302a, and the contact block 302a cooperates with the contact rod 301e, and the contact block 302a on the operating rod 301a contacts the contact rod 301e, so that the arc is guided to the guide wire 302b to start arc extinguishing and guiding.

[0046] During use, when the cable is diverted and arc extinguished, the operator pulls the low ring 301c to separate the contact rod 301e from the guide block 301b, and the operator uses the operating rod 301a to make the fixed component 201 on the operating rod 301a clamped on the cable, and then releases the pull rod 301d, so that under the action of the reset spring 301f, the contact rod 301e returns to its original position and contacts the guide block 301b, and begins to attract and divert the arc on the fixed component 201, and the contact block 302a contacts the contact rod 301e inside the operating rod 301a to start diverting the arc to the guide line 302 b, the current is guided out through the guide wire 302b, and the arc extinguishing work is started. At the same time, the cable is clamped through the fixing component 201, and the cable on the fixing component 201 is fixed by the control button 102, so that the matching buckle 201b and the extrusion buckle 1 202f and the extrusion buckle 2 203e are matched. Different cables can be freely adjusted and fixed by matching the buckle 201b and the extrusion buckle 1 202f and the extrusion buckle 2 203e. At the same time, different wire clamps can be installed, and it can be compatible with a variety of wire clamps and line types, which simplifies the installation process and improves the convenience of operation. Its remote control fixing function effectively avoids the operator from directly contacting the live parts, significantly reducing the risk of electric shock. In addition, the fixing component and the arc extinguishing unit of the device work together to achieve fast and safe arc diversion and arc extinguishing processing, improve the operation speed and further ensure the safety of the operation.

[0047] The remaining structure is the same as that of Example 2.

[0048] Importantly, it should be noted that the construction and arrangement of the present application shown in a plurality of different exemplary embodiments are only exemplary. Although only a few embodiments are described in detail in this disclosure, it should be readily understood by those who refer to this disclosure that many modifications are possible (e.g., the size, scale, structure, shape and proportion of various elements, as well as parameter values ​​(e.g., temperature, pressure, etc.), mounting arrangements, use of materials, color, directional changes, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in the application. For example, the element shown as integrally formed can be composed of multiple parts or elements, the position of the element can be inverted or otherwise changed, and the nature or number or position of the discrete element can be changed or changed. Therefore, all such modifications are intended to be included in the scope of the present invention. The order or sequence of any process or method steps can be changed or reordered according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure described herein that performs the function, and is not only structurally equivalent but also equivalent structure. Without departing from the scope of the present invention, other replacements, modifications, changes and omissions can be made in the design, operating conditions and arrangement of the exemplary embodiments. Therefore, the invention is not limited to a specific embodiment, but extends to numerous modifications still falling within the scope of the appended claims.

[0049] Additionally, in order to provide a concise description of exemplary embodiments, all features of an actual embodiment (ie, those features that are not relevant to the best mode presently contemplated for carrying out the invention or those that are not relevant to implementing the invention) may not be described.

[0050] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A multifunctional arc extinguishing device for live working, characterized in that: include: A drive unit (100) comprises a housing (101), a control button (102) arranged on the housing (101), a power supply (103) arranged at the bottom of the control button (102), and a control panel (104) arranged inside the housing (101); A fixing unit (200) comprising a fixing component (201) arranged at one side of the housing (101), a main clamping component (202) arranged at the top of the fixing component (201), a secondary clamping component (203) arranged at the bottom of the fixing component (201), and a connecting rotating shaft (204) arranged at the bottom of the fixing component (201); The arc extinguishing unit (300) comprises an arc extinguishing component (301) arranged at the bottom of the fixing component (201), and a flow guide component (302) arranged inside the arc extinguishing component (301).

2. The multifunctional arc extinguishing device for live working according to claim 1 is characterized in that: The fixing assembly (201) comprises a fixing main board (201a) arranged on one side of the housing (101), a matching buckle (201b) arranged on the fixing main board (201a), a guide plate (201d) arranged at the bottom of the fixing main board (201a), and a support plate (201c) arranged at the bottom of the fixing main board (201a).

3. The multifunctional arc extinguishing device for live working according to claim 2 is characterized in that: The main clamping assembly (202) comprises a top shell (202a) arranged on the top of the fixed main board (201a), a rotating motor (202b) arranged inside the top shell (202a), and a spiral rod (202c) slidably arranged inside the rotating motor (202b).

4. The multifunctional arc extinguishing device for live working according to claim 3 is characterized in that: A fixing block (202e) is disposed at the bottom of the spiral rod (202c), and a pressing buckle (202f) is disposed at the bottom of the fixing block (202e), and the pressing buckle (202f) cooperates with the matching buckle (201b).

5. The multifunctional arc extinguishing device for live working according to claim 4 is characterized in that: A rotating handle (202d) is provided on the top of the support plate (201c).

6. The multifunctional arc extinguishing device for live working according to claim 5 is characterized in that: The auxiliary clamping assembly (203) comprises a low shell (203a) arranged at the bottom of the fixed main board (201a), a second rotating motor (203b) arranged inside the low shell (203a), a second spiral rod (203c) arranged inside the second rotating motor (203b), and a second extrusion buckle (203e) arranged at one end of the second spiral rod (203c), and the second extrusion buckle (203e) cooperates with the matching buckle (201b).

7. The multifunctional arc extinguishing device for live working according to claim 6 is characterized in that: The other end of the spiral rod 2 (203c) is provided with a rotating handle 2 (203d).

8. The multifunctional arc extinguishing device for live working according to claim 7 is characterized in that: The arc extinguishing assembly (301) comprises a guide block (301b) rotatably arranged on the connecting rotating shaft (204), an operating rod (301a) arranged on the guide block (301b), a low ring (301c) arranged at the bottom of the operating rod (301a), and a contact rod (301e) slidably arranged inside the operating rod (301a).

9. The multifunctional arc extinguishing device for live working according to claim 8, characterized in that: A pull rod (301d) is provided at the bottom of the contact rod (301e), a return spring (301f) is provided on the outer diameter of the pull rod (301d), and the return spring (301f) is connected to the contact rod (301e).

10. The multifunctional arc extinguishing device for live working according to claim 9, characterized in that: The flow guide assembly (302) comprises a contact block (302a) arranged on the operating rod (301a), and a flow guide line (302b) arranged on the contact block (302a), and the contact block (302a) cooperates with the contact rod (301e).