Friction coupling for grounding knife switch and grounding knife switch

Abstract

The invention relates to the technical field of electric power system safety protection, and discloses a friction coupling for a grounding knife-switch and the grounding knife-switch, the friction coupling comprises a fixed seat, an outer rotating shaft and an inner rotating shaft, the outer rotating shaft and the inner rotating shaft are rotatably arranged on the fixed seat, an inner end is arranged at the inner end of the outer rotating shaft, and the inner end is sleeved with an outer friction wheel; the outer friction wheel and the outer rotating shaft are circumferentially clamped and axially connected in a sliding manner; an inner friction wheel is fixedly arranged at the outer end of the inner rotating shaft; an elastic piece is further arranged between the outer rotating shaft and the outer friction wheel, the friction surface of the outer friction wheel and the friction surface of the inner friction wheel are of a multi-stage stepped contact structure, the friction surface of the outer friction wheel is divided into at least two stages of annular areas with different curvature radiuses, and the friction surface of the inner friction wheel is correspondingly arranged; by means of the design, after the disconnecting link plate is in place, the disconnecting link plate slips due to structure limiting, power transmission is automatically cut off, equipment is protected against overload damage, meanwhile, segmented friction force adjustment under different loads is achieved, the transmission efficiency is improved, and accurate control over a plurality of components is achieved through one driving source.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power system safety protection, and in particular to a friction coupling for a grounding knife switch and the grounding knife switch. BACKGROUND

[0002] Ice coating on a power transmission line is one of the main natural disasters threatening the power grid, and severe ice coating can cause a large area of the power grid to be paralyzed. At present, power grid companies install a direct current ice melting device in a hub substation to achieve ice melting for incoming and outgoing conductors. However, since the ground wire itself does not pass through current, it cannot generate heat energy through its own load current to resist freezing, and the surface is more prone to ice coating. Therefore, a connection method is needed to introduce the ice melting current from the conductor to the ground wire to achieve the purpose of ice melting by using the heat effect of the current.

[0003] At present, there are two types of ground wire ice melting connection devices, one is a handheld type, and the other is an automatic ground wire ice melting connection device. The handheld type has the disadvantages of long time consumption, high risk, and great difficulty in docking. The automatic connection device has the disadvantages of heavy weight, great construction difficulty, and inability to self-correct. In addition, the traditional grounding knife switch needs multiple independent driving sources to control the knife switch wheel and the knife switch plate, resulting in complex structure, high cost, and poor coordination. Therefore, a new type of overhead ground wire ice melting friction coupling structure is needed to realize the function of controlling the knife switch, moving contact and other components by a low-temperature motor. SUMMARY

[0004] The present application discloses a friction coupling for a grounding knife switch and the grounding knife switch to solve the technical problem that a single driving component cannot achieve one control of multiple in the existing grounding knife switch in the related art.

[0005] To solve the above problems, the present application adopts the following technical solutions: The present application provides a friction coupling for a grounding knife switch, comprising a fixed seat, comprising an outer fixed plate and an inner fixed plate, the outer fixed plate and the inner fixed plate are connected by a connecting rod; an outer rotating shaft rotatably arranged on the outer fixed plate, an inner end of the outer rotating shaft is provided with an inner end head, an outer friction wheel is sleeved on the inner end head, the outer friction wheel is circumferentially clamped and axially slidably connected with the outer rotating shaft; an inner rotating shaft rotatably arranged on the inner fixed plate, an outer end of the inner rotating shaft is provided with an outer end head, an inner friction wheel is fixedly arranged on the outer end head; an elastic member is arranged between the outer rotating shaft and the outer friction wheel to provide a pre-tightening force to make the friction surfaces of the outer friction wheel and the inner friction wheel fit; wherein the friction surfaces of the outer friction wheel and the inner friction wheel are a multi-stage stepped contact structure, the friction surface of the outer friction wheel is divided into at least two annular regions with different curvature radii, and the inner friction wheel is provided with a matching curvature radius in the corresponding region.

[0006] Preferably, the friction surface of the outer friction wheel is formed with a guide groove extending in the circumferential direction and forming a wedge-shaped gap with the friction surface of the inner friction wheel.

[0007] Preferably, the elastic member is a gradient stiffness spring set comprising a plurality of springs with decreasing stiffness and arranged in sequence in the axial direction, and the two ends of the spring set are connected to the outer friction wheel and the outer rotating shaft, respectively.

[0008] Preferably, a limiting guide column is arranged between the outer rotating shaft and the inner rotating shaft, one end of the guide column is fixed to the outer rotating shaft, and the other end penetrates the inner rotating shaft and is in sliding fit with the fixed seat.

[0009] Preferably, the end of the outer friction wheel is provided with an elastic stop washer, the washer is made of rubber or polyurethane material, and the washer is detachably connected to the fixed seat by screws.

[0010] Preferably, a plurality of grooves are arranged on the inner side of the friction surface of the outer friction wheel and the inner friction wheel, and the grooves are equidistantly distributed in the circumferential direction of the corresponding friction surface.

[0011] Preferably, a double-layer braking structure is arranged on the outer end of the inner rotating shaft, including a metal stop ring fixed on the inner rotating shaft and an elastic buffer ring sleeved on the outer side of the metal stop ring, and the elastic buffer ring is made of silica gel material.

[0012] Preferably, a sealing ring is arranged between the outer friction wheel and the inner friction wheel, and the two ends of the sealing ring abut against the non-friction areas of the outer friction wheel and the inner friction wheel, respectively.

[0013] The application also provides a grounding knife switch, which comprises a knife switch body and a friction coupling for a grounding knife switch as described above, the knife switch body comprises a base, a connecting support, an insulator and a knife, one end of the base is provided with the connecting support, the other end is provided with the insulator, the knife comprises a knife switch wheel and a knife switch plate connected with the knife switch wheel, and the knife switch wheel is rotatably connected with the connecting support through the friction coupling for the grounding knife switch.

[0014] Preferably, the outer rotating shaft is connected with the knife switch wheel, and a detachable coupling flange is arranged between the outer rotating shaft and the knife switch wheel, the coupling flange is matched with the outer rotating shaft through a key groove and is fixed with the knife switch wheel through bolts.

[0015] The technical scheme adopted by the application can achieve the following beneficial effects: 1. The elastic member pre-tightening force is used to make the friction surfaces fit together, and after the knife shutter board is in place, the structure is limited to slip, automatically cutting off the power transmission, protecting the equipment from overload damage; a multi-stage stepped contact surface structure is adopted to realize segmented friction force adjustment under different loads, improve transmission efficiency, use one driving source to realize accurate control of multiple components, the structure is simple, reduces system complexity and cost, and the function is reliable.

[0016] 2. The wedge-shaped guide groove formed on the friction surface of the outer friction wheel can produce a friction self-locking effect when sliding, enhancing the stability of power transmission, reducing sliding loss, and prolonging the service life of the friction surface.

[0017] 3. The gradient stiffness spring group is composed of a plurality of springs arranged circumferentially and decreasing in stiffness, which can adapt to the elastic deformation requirements of the friction surface under different driving loads, avoid spring fracture due to excessive overload, and improve the durability of the structure.

[0018] 4. The limiting guide column limits the relative offset amount of the outer rotating shaft and the inner rotating shaft, ensures the fitting precision of the friction surface, and reduces the transmission failure caused by assembly error.

[0019] 5. The elastic stop washer can adjust the initial compression force of the friction surface, optimize the contact state of the friction surface, and also absorb vibration energy and reduce noise, meeting the requirements of green production.

[0020] 6. Before installing the equipment, a lubricant is appropriately applied to the friction surface, and the circumferentially equidistant grooves arranged on the friction surface can store lubricant and reduce the accumulation of friction heat, thereby reducing the temperature of the friction surface, delaying wear, and improving transmission efficiency and service life.

[0021] 7. The double-layer brake structure can absorb impact energy when the friction slips, protect the friction wheel from overload damage, and maintain the stability of the structure.

[0022] 8. The sealing ring can prevent dust from entering the friction surface, reduce impurity wear, and ensure long-term efficient operation of the friction surface.

[0023] 9. The application also provides a grounding knife shutter, which comprises a knife shutter body and a friction coupling for a grounding knife shutter as described above, and has the same beneficial effects as the above-mentioned friction coupling for a grounding knife shutter, which will not be repeated here.

[0024] 10. The knife shutter wheel and the outer rotating shaft are connected by a detachable coupling flange, which facilitates quick replacement of the knife shutter wheel assembly, improves equipment maintenance convenience, and reduces downtime. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed in the embodiments or prior art description. Obviously, the drawings described below only show some of the embodiments of the present application, and all other drawings obtained by those of ordinary skill in the art without creative effort based on these drawings also belong to the scope of protection of the present application.

[0026] Figure 1 is a schematic view of a friction coupling for a grounding knife switch disclosed by the first embodiment of the present application; Figure 2 is a sectional view of a friction coupling for a grounding knife switch disclosed by the first embodiment of the present application; Figure 3 is a schematic view of an outer friction wheel of a friction coupling for a grounding knife switch disclosed by the first embodiment of the present application; Figure 4 is a front view of a grounding knife switch disclosed by the second embodiment of the present application; Figure 5 is a side view of a grounding knife switch disclosed by the second embodiment of the present application.

[0027] In the drawings: 100, a friction coupling for a grounding knife switch; 200, a grounding knife switch; 1, an outer fixing plate; 2, an inner fixing plate; 3, a connecting rod; 4, an outer rotating shaft; 5, a knife switch wheel; 6, an outer friction wheel; 7, a spring; 8, an inner rotating shaft; 9, a knife switch plate; 10, an inner friction wheel; 11, an inner end head; 12, an outer end head; 13, an annular area; 14, a guide groove; 15, a guide column; 16, a gasket; 17, a groove; 18, a double-layer braking structure; 19, a sealing ring; 20, a knife switch main body; 21, a base; 22, a connecting support; 23, an insulator; 24, a knife switch; 25, a coupling flange; 30, a fixing seat. DETAILED DESCRIPTION

[0028] In order to make the objects, technical solutions and advantages of the present application clearer, the technical solutions of the present application will be described in detail below. Obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort belong to the scope of protection of the present application.

[0029] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0030] In the management of icing on power grid transmission lines, the ground wire de-icing device needs to be connected to the grounding switch to eliminate the risk of icing. The existing driving structure of the grounding switch has the following technical defects: Controlling multiple components with a single drive source is difficult: Traditional grounding switches require multiple independent drive sources to control the switch wheel and switch plate respectively, resulting in complex structure, high cost and poor coordination.

[0031] Uncontrollable power transmission: The mechanical linkage structure cannot automatically cut off the power transmission after the knife switch component is in place, which can easily lead to equipment damage due to overload.

[0032] Low transmission reliability: Traditional friction drives are prone to efficiency loss or failure due to friction surface wear and load fluctuations, and lack the ability to adapt to different working conditions.

[0033] The following is in conjunction with the appendix Figures 1 to 5 The present application provides a detailed description of a friction coupling 100 for a grounding switch and a grounding switch 200 through specific embodiments and application scenarios.

[0034] Please refer to Figure 1 and Figure 2The first embodiment of the application provides a friction coupling for grounding knife switch 100, which comprises a fixed seat 30, an outer fixed plate 1 and an inner fixed plate 2, the outer fixed plate 1 and the inner fixed plate 2 are connected through a connecting rod 3; an outer rotating shaft 4 is rotatably arranged on the outer fixed plate 1, an inner end head 11 is arranged at the inner end of the outer rotating shaft 4, an outer friction wheel 6 is sleeved on the inner end head 11, the outer friction wheel 6 is circumferentially clamped and axially slidably connected with the outer rotating shaft 4; an inner rotating shaft 8 is rotatably arranged on the inner fixed plate 2, an outer end head 12 is arranged at the outer end of the inner rotating shaft 8, an inner friction wheel 10 is fixedly arranged on the outer end head 12; an elastic member 7 is arranged between the outer rotating shaft 4 and the outer friction wheel 6, and is used for providing a pre-tightening force to make the friction surfaces of the outer friction wheel 6 and the inner friction wheel 10 fit; wherein the friction surfaces of the outer friction wheel 6 and the inner friction wheel 10 are a multi-stage stepped contact structure, the friction surface of the outer friction wheel 6 is divided into at least two annular regions 13 with different curvature radii, and the inner friction wheel 10 is provided with a matching curvature radius in the corresponding region.

[0035] It can be understood that in the friction coupling for grounding knife switch 100 provided in the first embodiment, the design of the elastic member 7 can utilize the pre-tightening force of the elastic member 7 to make the friction surfaces between the outer friction wheel 6 and the inner friction wheel 10 tightly fit, and after the knife switch plate 9 is in place, the slip caused by structural limiting can automatically cut off the power transmission, thereby protecting the equipment from overload damage; at the same time, the multi-stage stepped contact surface structure can realize segmented friction force adjustment under different power loads, improve transmission efficiency, and ultimately realize precise control of multiple components by using one driving source, and the structure is simple, which can reduce system complexity and cost and is reliable in function.

[0036] Specifically, the outer rotating shaft 4 is connected with the knife switch wheel 5, and the inner rotating shaft 8 is connected with the knife switch plate 9. The outer rotating shaft 4 is rotatably arranged on the outer fixed plate 1 through a bearing, and the inner rotating shaft 8 is rotatably arranged on the inner fixed plate 2 through a bearing, so as to realize the rotary installation of the outer rotating shaft 4 and the inner rotating shaft 8.

[0037] Optionally, in some embodiments, the friction surfaces of the outer friction wheel 6 and the inner friction wheel 10 fit each other, and the friction surfaces of the outer friction wheel 6 and the inner friction wheel 10 are each provided with friction teeth to improve the friction force; the knife switch wheel 5 is rotated under the action of a driving assembly, the outer friction wheel 6 and the inner friction wheel 10 are in contact and fit, transmission is performed, the knife switch wheel 5 drives the knife switch plate 9 to rotate, and the on-off of the knife switch is realized. When the knife switch plate 9 is in place, the inner friction wheel 10 does not continue to rotate due to structural limitation, the outer friction wheel 6 and the inner friction wheel 10 slide, and transmission is cut off.

[0038] Further, please refer to Figure 3 The friction surface of the outer friction wheel 6 is formed with a guide groove 14, the guide groove 14 extends in the circumferential direction and forms a wedge-shaped gap with the friction surface of the inner friction wheel 10.

[0039] As an optional embodiment, the friction surface of one of the outer friction wheel 6 and the inner friction wheel 10 forms the guide groove 14, or the friction surfaces of both of them form the guide groove 14, and the outer friction wheel 6 and the inner friction wheel 10 are staggered and installed according to the position of the guide groove 14 to form a wedge-shaped gap.

[0040] It can be understood that the wedge-shaped guide groove 14 formed on the friction surface of the outer friction wheel 6 can generate a friction self-locking effect during friction sliding, enhance the stability of power transmission, reduce sliding loss, and prolong the service life of the friction surface.

[0041] Specifically, the wedge angle of the guide groove 14 ranges from 5° to 10°.

[0042] Specifically, please refer to Figure 3 The friction surface of the outer friction wheel 6 or the inner friction wheel 10 is divided into at least two annular regions 13 with different radii of curvature, and preferably the radius of curvature of the annular region close to the axis of the friction surface is smaller than the radius of curvature of the annular region away from the axis of the friction surface; in this embodiment, the surface of the annular region 13 away from the axis of the friction surface is provided with the guide groove 14, and the surface of the annular region 13 close to the axis of the friction surface is a smooth surface or a patterned surface. The purpose is that the guide groove 14 of the outer annular region serves as the main part for transmitting friction, and when power transmission is performed, the wedge-shaped gap formed by the guide groove 14 utilizes the self-locking effect to transmit power to the inner friction wheel 10 or the outer friction wheel 6, at which time the knife gate plate 9 gradually closes, and when the knife gate plate 9 is in place, the guide groove 14 of the outer annular region slips by friction, the protruding part thereof abuts against the other friction surface, so that the elastic member 7 is contracted, and a gap is generated between the friction surfaces of the outer friction wheel 6 and the inner friction wheel 10. Meanwhile, the inner annular region 13 is relatively smooth, and its structural characteristics make the friction surfaces automatically slip after the knife gate plate 9 is in place, thereby automatically cutting off the power transmission and protecting the equipment from overload damage.

[0043] Further, the elastic member 7 is a gradient stiffness spring set, which includes a plurality of springs with decreasing stiffness and is arranged in sequence along the axial direction, and the two ends of the spring set are connected to the outer friction wheel 6 and the outer rotating shaft 4, respectively.

[0044] It can be understood that, compared with the traditional spring connection, the gradient stiffness spring set is composed of a plurality of springs with decreasing stiffness arranged in the circumferential direction, which can adapt to the elastic deformation requirements of the friction surface under different driving loads, avoid the fracture of the spring due to excessive load, and improve the durability of the structure.

[0045] Further, a limiting guide column 15 is arranged between the outer rotating shaft 4 and the inner rotating shaft 8, one end of the guide column 15 is fixed to the outer rotating shaft 4, and the other end penetrates through the inner rotating shaft 8 and is in sliding fit with the fixed seat 30.

[0046] It can be understood that the fixed seat 30 is provided with a certain range of guide grooves at the part fixed with the limiting guide column 15, so that the limiting guide column 15 limits the relative offset amount of the outer rotating shaft 4 and the inner rotating shaft 8, ensures the fitting precision of the friction surface, and reduces the transmission failure caused by assembly error.

[0047] Further, the end of the outer friction wheel 6 is provided with an elastic stop washer 16 made of rubber or polyurethane material, and the washer 16 is detachably connected with the fixed seat through a screw.

[0048] It can be understood that the elastic stop washer 16 can adjust the initial compression force of the friction surface, optimize the contact state of the friction surface, and also absorb vibration energy and reduce noise, meeting the requirements of green production.

[0049] Further, the inner side of the friction surface of the outer friction wheel 6 and the inner friction wheel 10 is provided with a plurality of grooves 17, which are equidistantly distributed along the circumference of the corresponding friction surface.

[0050] It can be understood that before the installation of the equipment, lubricant is appropriately applied to the inner side of the friction surface, and the equidistantly arranged grooves 17 on the circumference of the friction surface can store lubricant and reduce the accumulation of friction heat, reduce the temperature of the friction surface, delay wear, and improve the transmission efficiency and service life; specifically, during the operation of the equipment, the lubricant on the inner side of the friction surface will gradually penetrate into the friction effective area under the action of centrifugal force.

[0051] Further, the outer end 12 of the inner rotating shaft 8 is provided with a double-layer braking structure 18, including a metal stop ring fixed on the inner rotating shaft 8 and an elastic buffer ring sleeved outside the metal stop ring, and the elastic buffer ring is made of silica gel material.

[0052] It can be understood that the double-layer braking structure 18 designed as a buffer structure in the device can absorb the impact energy when the friction slips, protect the outer friction wheel 6 and the inner friction wheel 10 from overload damage, and maintain the structural stability at the same time.

[0053] Further, a sealing ring 19 is arranged between the outer friction wheel 6 and the inner friction wheel 10, and the two ends of the sealing ring 19 abut against the non-friction areas of the outer friction wheel 6 and the inner friction wheel 10 respectively.

[0054] It can be understood that the sealing ring 19 is arranged to prevent dust and other impurities from entering the friction surface during daily work, reduce impurity wear, and ensure long-term efficient operation of the friction surface.

[0055] Please refer to Figure 4 and Figure 5The second embodiment of the present application provides a grounding knife switch 200, comprising a knife switch body 20 and the friction coupling 100 for the grounding knife switch as described in the first embodiment, the knife switch body 20 comprises a base 21, a connecting support 22, an insulator 23 and a knife 24, one end of the base 21 is provided with the connecting support 22, the other end is provided with the insulator 23, the knife 24 comprises a knife switch wheel 5 and a knife switch plate 9 connected with the knife switch wheel 5, and the knife switch wheel 5 is rotatably connected with the connecting support 22 through the friction coupling 100 for the grounding knife switch.

[0056] Further, the outer rotating shaft 4 is connected with the knife switch wheel 5, and a detachable connecting flange 25 is arranged between the outer rotating shaft 4 and the knife switch wheel 5, the connecting flange 25 is matched with the outer rotating shaft 4 through a key groove and is fixed with the knife switch wheel 5 through a bolt.

[0057] It can be understood that the knife switch wheel 5 and the outer rotating shaft 4 are connected through the detachable connecting flange 25, so that the knife switch wheel 5 assembly and the friction coupling 100 can be quickly replaced, the equipment maintenance convenience is improved, and the downtime is reduced.

[0058] Compared with the prior art, the present application has the following beneficial effects: The elastic member pre-tightening force is used to make the friction surfaces fit, and after the knife switch plate is in place, the structure is limited to slip, the power transmission is automatically cut off, the equipment is protected from overload damage, the multi-stage stepped contact surface structure is adopted, the segmented friction force adjustment under different loads is realized, the transmission efficiency is improved, one driving source is used to realize accurate control of multiple components, the structure is simple, the system complexity and cost are reduced, and the function is reliable.

[0059] It should be noted that in this document, the terms "comprising", "including", or any other variant thereof are intended to cover non-exclusive inclusions, so that processes, methods, articles or devices including a series of elements not only include those elements, but also include other elements not explicitly listed, or inherent to such processes, methods, articles or devices. Without more limitations, the element defined by the statement "including a" does not exclude the presence of other identical elements in the process, method, article or device including the element.

[0060] In addition, it should be noted that the scope of the methods and devices in the embodiments of the present application is not limited to performing functions in the order shown or discussed, but can also include performing functions in a substantially simultaneous manner or in the opposite order according to the functions involved, for example, the described method can be performed in an order different from the described order, and various steps can also be added, omitted or combined. In addition, the features described with reference to certain examples can be combined in other examples.

[0061] The above merely illustrates the specific embodiments of the present application, but the protection scope of the present application is not limited thereto, any person skilled in the art can easily think of the changes or replacements within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.

Claims

1. A friction coupling for a grounding pole shutter, characterized in that, The utility model relates to a fixed seat (30) including outer fixed plate (1) and inner fixed plate (2), outer fixed plate (1) with inner fixed plate (2) are connected through connecting rod (3), outer rotating shaft (4) rotatable is established in outer fixed plate (1), and the inner end of outer rotating shaft (4) is equipped with inner end head (11), and the sleeve of inner end head (11) is equipped with outer friction wheel (6), and outer friction wheel (6) and outer rotating shaft (4) circumferential clamping and axial sliding connection are connected, inner rotating shaft (8) rotatable is established in inner fixed plate (2), and the outer end of inner rotating shaft (8) is equipped with outer end head (12), and the fixed of outer end head (12) is equipped with inner friction wheel (10), elastic part (7) are set up between outer rotating shaft (4) and outer friction wheel (6), are used to provide pre-tightening force and make the friction surface of outer friction wheel (6) and inner friction wheel (10) fit, wherein the friction surface of outer friction wheel (6) and inner friction wheel (10) is multistage ladder type contact structure, and the friction surface of outer friction wheel (6) is divided into at least two annular regions (13) of different curvature radii, and the corresponding region of inner friction wheel (10) is provided with matched curvature radius. The friction surface of the outer friction wheel (6) is formed with a guide groove (14), and the guide groove (14) extends in the circumferential direction and forms a wedge-shaped gap with the friction surface of the inner friction wheel (10). The elastic member (7) is a gradient stiffness spring set including a plurality of springs with decreasing stiffness and arranged in sequence along the axial direction, and the two ends of the spring set are connected to the outer friction wheel (6) and the outer rotating shaft (4), respectively. A limiting guide column (15) is arranged between the outer rotating shaft (4) and the inner rotating shaft (8), one end of the guide column (15) is fixed to the outer rotating shaft (4), the other end penetrates through the inner rotating shaft (8) and is in sliding fit with the fixed seat (30). An elastic stop washer (16) is arranged at the end of the outer friction wheel (6), the washer (16) is made of rubber or polyurethane material, and the washer (16) is detachably connected to the fixed seat (30) by screws. The inner side of the friction surface of the outer friction wheel (6) and the inner friction wheel (10) is provided with a plurality of grooves (17), and the grooves (17) are equidistantly distributed in the circumferential direction of the corresponding friction surface.

2. The friction coupling for grounding pole-arms according to claim 1, characterized in that, The outer end head (12) of the inner rotating shaft (8) is provided with a double-layer braking structure (18) including a metal stop ring fixed to the inner rotating shaft (8) and an elastic buffer ring sleeved outside the metal stop ring, and the elastic buffer ring is made of silica gel material.

3. The friction coupling for grounding pole-arms according to claim 1, characterized in that, A sealing ring (19) is arranged between the outer friction wheel (6) and the inner friction wheel (10), and the two ends of the sealing ring (19) abut against the non-friction areas of the outer friction wheel (6) and the inner friction wheel (10), respectively.

4. The friction coupling for grounding pole-arms according to claim 1, characterized in that, ​ 5. The friction coupling for grounding pole-arms according to claim 1, characterized in that, ​ 6. The friction coupling for grounding pole-arms according to claim 1, characterized in that, ​ 7. The friction coupling for grounding pole-arms according to claim 1, characterized in that, ​ 8. The friction coupling for a grounding pole gap according to claim 6, characterized in that ​ 9. A grounding knife switch comprising a knife switch body (20) and a friction coupling for a grounding knife switch according to any one of claims 1-8, characterized in that, The knife switch main body (20) comprises a base (21), a connecting support (22), an insulator (23) and a knife (24), one end of the base (21) is provided with the connecting support (22), the other end is provided with the insulator (23), the knife (24) comprises a knife switch wheel (5) and a knife switch plate (9) connected with the knife switch wheel (5), the knife switch wheel (5) is rotatably connected with the connecting support (22) through the friction coupling for the grounding knife switch.

10. The grounding link claimed in claim 9, wherein, The outer rotating shaft (4) is connected with the knife switch wheel (5), and a detachable coupling flange (25) is arranged between the outer rotating shaft (4) and the knife switch wheel (5). The coupling flange (25) is matched with the outer rotating shaft (4) through a key groove and is fixed with the knife switch wheel (5) through bolts.

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