Transmission structure for grounding switch, grounding switch and working method of grounding switch

Abstract

The invention discloses a transmission structure for a grounding switch, the grounding switch and a working method of the grounding switch. The transmission structure comprises a fan-shaped crank arm adopting a variable radius design; the edge of the fan-shaped crank arm is provided with a first shaft pin used for being inserted and connected with a moving contact; a second shaft pin is inserted into the vertex of the fan-shaped crank arm; when opening and closing actions are carried out, the fan-shaped crank arm can rotate clockwise or anticlockwise by taking the second shaft pin as an axis, so that the distance from the first shaft pin to the second shaft pin is gradually increased or gradually reduced, and then the rail generates upward or downward acting force on the first shaft pin to drive the moving contact to move up and down; therefore, reliable opening or closing operation is realized. The variable radius arrangement on the fan-shaped crank arm ensures the travel in the switching-on and switching-off process, and excessive space is not occupied due to the travel; by adopting the structural design, not only is the high performance of the direct insertion type structure ensured, but also the size space of the grounding switch can be reduced, and the requirements of engineering application are met.

Description

Technical Field

[0001] The present invention belongs to the technical field of grounding switches, and in particular relates to a transmission structure for a grounding switch, a grounding switch and a working method thereof. Background Art

[0002] The grounding switch is an important electrical device, which is mainly used to release the static charge of the equipment and circuits under maintenance, and to ensure the personal safety of maintenance personnel during power outages. Therefore, the grounding switch plays an important role in the electrical system, ensuring the safety of maintenance work and the stable operation of the power system.

[0003] At present, the transmission structure of the traditional plug-in grounding switch usually adopts a crank slider structure. This structure requires a large space to accommodate the travel of the connecting plate and the moving contact when the grounding switch moves from the closed state to the open position; specifically, due to the characteristics of the crank slider structure, the moving contact will move in a straight line or curve along a predetermined trajectory during the movement process. This movement process not only involves the moving distance of the moving contact itself, but also includes the corresponding movement of connecting parts such as the connecting plate, thereby increasing the overall space required. Therefore, the adoption of the above-mentioned traditional design results in a relatively long overall length of the traditional plug-in grounding switch, which in turn increases the distance between the product center and the fixed wall accordingly, making it impossible to achieve a miniaturized design of the grounding switch, and thus unable to meet the needs of engineering applications.

[0004] It can be seen that the existing grounding switch transmission structure needs to occupy a certain internal space of the grounding switch due to the long overall travel of the transmission structure, which makes it impossible to reduce the size of the grounding switch and meet the needs of engineering applications. Summary of the invention

[0005] The present invention provides a transmission structure for a grounding switch to solve the technical problem that, in the existing grounding switch transmission structure, the overall stroke of the transmission structure is relatively long and a certain internal space of the grounding switch needs to be occupied, resulting in the inability to reduce the size of the grounding switch and the inability to meet the needs of engineering applications.

[0006] In order to achieve the above object, the present invention adopts the following technical contents:

[0007] A transmission structure for a grounding switch, comprising a fan-shaped crank arm;

[0008] The edge of the fan-shaped crank arm is provided with a track;

[0009] A first axle pin capable of moving in a vertical direction is inserted on the track, and the first axle pin is used to connect a moving contact of the grounding switch;

[0010] The fan-shaped crank arm is set with a variable radius, and the radius of the fan-shaped crank arm gradually increases from one side of the fan-shaped crank arm to the other side;

[0011] A second shaft pin is inserted at the rotation center of the fan-shaped crank arm;

[0012] The fan-shaped crank arm can rotate clockwise or counterclockwise with the second shaft pin as the axis, so that the distance from the first shaft pin to the second shaft pin gradually increases or decreases, and the first shaft pin is driven to move upward or downward in the vertical direction on the track to drive the moving contact to move up and down to complete the opening and closing action of the grounding switch.

[0013] Furthermore, the track includes a variable radius section, a transition arc section and a track self-locking section which are connected in sequence; wherein the track self-locking section adopts a horizontal structure arrangement; when the first axle pin is at any point on the track self-locking section, the distance between the first axle pin and the second axle pin remains unchanged.

[0014] Furthermore, the stroke of the grounding switch is equal to the difference between the radius of the closing position and the radius during the movement process; wherein the radius of the closing position is the distance from the first axis pin to the second axis pin in the closing state; and the radius during the movement process is the distance from the first axis pin to the second axis pin during the orbital movement.

[0015] Furthermore, the stroke of the grounding switch is ≥ half of the radius of the closing position.

[0016] Furthermore, a first roller that is slidably matched with the track is provided at the end of the first shaft pin; and the transition arc segment is larger than the diameter of the first roller.

[0017] Furthermore, a square hole is provided on the housing of the grounding switch, and the second roller of the first shaft pin is inserted into the square hole and can move up and down along the square hole;

[0018] One end of the first shaft pin is connected to the moving contact through a joint, and the other end is sleeved with a first shaft sleeve, and the first shaft sleeve is located between the first roller and the second roller; a retaining ring is provided at the end of the first shaft pin;

[0019] A second shaft sleeve is arranged between the second roller and the joint, and the second shaft sleeve is sleeved on the first shaft pin.

[0020] Furthermore, the second axle pin is connected with a rotating shaft, and the fan-shaped crank arm is movably connected to the housing of the grounding switch through the rotating shaft.

[0021] A grounding switch, characterized by comprising the above-mentioned transmission structure for the grounding switch and a grounding switch body;

[0022] The switch body comprises a static side contact, a dynamic side contact and a housing;

[0023] The movable side contact is located in the housing, and a contact finger is arranged inside the movable side contact.

[0024] Furthermore, a shielding cover is provided on the moving side contact; a first guide groove is provided on the shielding cover; a second guide groove is provided on the housing; the first guide groove cooperates with the second guide groove to guide the moving contact.

[0025] A working method of a transmission structure for a grounding switch, based on the transmission structure for a grounding switch, comprises:

[0026] The fan-shaped crank arm rotates in the closing direction under the action of the driving force, so that the distance from the first shaft pin to the second shaft pin gradually increases, and then the first shaft pin drives the moving contact to move upward in the vertical direction to achieve closing;

[0027] The fan-shaped crank arm rotates in the opening direction under the action of the driving force, so that the distance from the first shaft pin to the second shaft pin gradually decreases, and then the first shaft pin drives the moving contact to move downward in the vertical direction to achieve opening.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] The present invention provides a transmission structure for a grounding switch, which includes a fan-shaped crank arm with a variable radius design; a first axle pin connected to a moving contact is provided on the edge of the fan-shaped crank arm; a second axle pin is inserted at the top of the fan-shaped crank arm; when performing an opening and closing action, the fan-shaped crank arm can rotate clockwise or counterclockwise with the second axle pin as the axis, so that the distance from the first axle pin to the second axle pin gradually increases or decreases, thereby causing the track to exert an upward or downward force on the first axle pin, driving the moving contact to move up and down, thereby realizing reliable opening or closing operations; the variable radius setting on the fan-shaped crank arm ensures that the stroke taken during the closing and opening process will not occupy too much space due to the stroke; the above-mentioned structural design not only ensures the high performance of the direct-insertion structure, but also reduces the size and space of the grounding switch, meeting the needs of engineering applications; the transmission structure has a simple principle, is easy to implement, and has good promotion and application value.

[0030] Preferably, in the present invention, the variable radius guide rail of the fan-shaped crank arm includes a variable radius section, a transition arc section and a track self-locking section connected in sequence; the track self-locking section adopts a horizontal structure arrangement, that is, in the closed position state, a fixed radius guide rail is arranged, and this section of the guide rail can realize the self-locking function of the switch.

[0031] Further preferably, in the present invention, the stroke of the grounding switch is equal to the difference between the radius of the closing position and the radius during the movement; thus, the accuracy and reliability of the stroke of the grounding switch are ensured.

[0032] Further preferably, in the present invention, a design is adopted in which the stroke of the grounding switch is greater than or equal to half of the radius of the closing position to prevent the radius drop from being too small, thereby generating excessive lateral force during the closing and opening process; the above design ensures the efficiency of the closing and opening operations.

[0033] Further preferably, in the present invention, a first roller is provided at the end of the first axle pin, and the transition arc segment is larger than the diameter of the first roller, thereby ensuring smooth rolling of the first roller during the reciprocating motion at both ends of the track, thereby ensuring the reliability of the transmission.

[0034] Preferably, in the present invention, the first axle pin is inserted into the square hole of the shell; the first axle pin is provided with components such as the second roller, the first sleeve, the retaining ring and the second sleeve; the above-mentioned component design not only ensures the stable installation and smooth movement of the first axle pin, but also improves the overall mechanical strength and stability.

[0035] The present invention also provides a grounding switch, comprising the above-mentioned transmission structure for the grounding switch and a grounding switch body, wherein the grounding switch body comprises a static side contact, a moving side contact and a shell; due to the adoption of the above-mentioned transmission structure for the grounding switch, the space occupied by the internal transmission structure of the entire grounding switch is reduced, thereby reducing the overall length of the grounding switch, achieving a reduction in the distance between the product center and the fixed wall, and meeting the needs of engineering applications.

[0036] Preferably, in the present invention, a shielding cover is provided on the moving side contact, and mutually matching guide grooves are provided on the shielding cover and the housing, providing precise guiding effect for the moving contact, thereby improving the stability and accuracy of the grounding switch during the opening and closing process.

[0037] The present invention also provides a working method of a transmission structure for a grounding switch. Based on the above-mentioned transmission structure for a grounding switch, in this method, the fan-shaped crank arm is first driven by external force, and the fan-shaped crank arm is rotated in the closing direction or the opening direction, so that the distance from the first shaft pin to the second shaft pin gradually increases or decreases, and then the first shaft pin drives the moving contact to move upward or downward in the vertical direction, thereby realizing reliable and precise closing and opening actions; this method utilizes the variable radius characteristic of the fan-shaped crank arm, reduces the space occupied by the entire transmission structure in the direction of movement, and ensures the reliability of closing and opening. The use of this method can realize the miniaturized design of the grounding switch and meet the needs of engineering applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 A schematic diagram of the principle of a conventional transmission structure of a grounding switch provided in an embodiment of the present invention, (a) is the closing position; (b) is the opening position;

[0039] Figure 2A schematic diagram of a practical engineering application of a grounding switch provided by an embodiment of the present invention;

[0040] Figure 3 A schematic structural diagram of a grounding switch including a transmission structure for a grounding switch provided in an embodiment of the present invention;

[0041] Figure 4 A side view of a grounding switch including a transmission structure for a grounding switch provided by an embodiment of the present invention;

[0042] Figure 5 A schematic structural diagram of a transmission structure for a grounding switch provided in an embodiment of the present invention.

[0043] Reference numerals:

[0044] 1-static contact; 2-moving contact; 3-moving contact; 4-housing; 5-first shaft pin; 6-closing direction; 7-opening direction; 8-fan-shaped crank arm; 9-second shaft pin; 10-first guide ring; 12-second guide ring; 13-first sleeve; 14-retaining ring; 15-first roller; 16-second roller; 17-second sleeve; 18-connecting surface; 91-rotating shaft;

[0045] 111-current entry surface; 21-connector; 31-contact finger; 32-shielding cover; 321-first guide groove; 311-first contact point; 312-second contact point;

[0046] 41-square hole; 411-first guide surface; 412-second guide surface; 42-second guide groove;

[0047] 81-track; 811-first track surface; 812-second track surface; 813-track centerline; 821-radius during movement; 822-closed position radius; 831-track self-locking section; 832-track self-locking surface; 833-self-locking circle centerline; 84-rotation center; 841-variable radius section; 842-transition arc section;

[0048] Earthing switch-900; closed busbar-901; connecting plate-902; connecting pin-903; crank arm-904. DETAILED DESCRIPTION

[0049] In order to make the technical problems, technical solutions and beneficial effects solved by the present invention more clearly understood, the present invention is further described in detail in the following specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0050] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0051] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0052] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0053] In the description of the embodiments of the present invention, it should be noted that if the terms "upper", "lower", "horizontal", "inner", etc. indicate an orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the invention is usually placed when in use, it is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0054] In addition, if the term "horizontal" appears, it does not mean that the component must be absolutely horizontal, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", which does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0055] In the description of the embodiments of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0056] Example 1

[0057] As mentioned in the background technology, the transmission structure of the existing traditional plug-in grounding switch usually adopts a crank slider structure. This structure requires a large space to accommodate the travel of the connecting plate and the moving contact when the grounding switch moves from the closed state to the open position; specifically, due to the characteristics of the crank slider structure, the moving contact will move in a straight line or curve along a predetermined trajectory during the movement process. This movement process not only involves the moving distance of the moving contact itself, but also includes the corresponding movement of connecting parts such as the connecting plate, thereby increasing the overall space required. Therefore, the adoption of the above-mentioned traditional design results in a relatively long overall length of the traditional plug-in grounding switch, which in turn leads to a corresponding increase in the distance between the product center and the fixed wall, making it impossible to achieve a miniaturized design of the grounding switch, and thus unable to meet the needs of engineering applications.

[0058] Specific as Figure 1 and Figure 2 As shown, Figure 1 (a) and Figure 1 In (b), the transmission structure adopts a crank slider structure, including a crank arm 904, a connecting pin 903 and a connecting plate 902, and the connecting plate 902 is connected to the moving contact 2 through the connecting pin 903; Figure 1 (a) is the closing position, Figure 1 (b) is the open position. It can be seen that Figure 1 (a) The closing position moves to Figure 1 (b) When the switch is in the open position, the space required includes the travel of the connecting plate 902 and the moving contact 2. Figure 2 As shown, the overall length of the grounding switch 900 needs to be designed to be relatively large to ensure reliable opening and closing actions; in actual engineering applications, the closed busbar 901 needs to protrude forward, and the channel space in the busbar installation area needs to occupy a relatively large space. However, due to the large overall length of the grounding switch 900, the distance between the product center and the fixed wall is relatively large, which affects the arrangement of the channel space in the busbar installation area and makes it impossible to meet the needs of engineering applications; therefore, it is necessary to design a transmission structure to reduce the size of the grounding switch to meet engineering requirements.

[0059] In order to solve the above problems, the present invention provides a transmission structure for a grounding switch. The transmission structure is provided with a fan-shaped crank arm with a variable radius. Due to the variable radius design of the fan-shaped crank arm, the stroke of the entire transmission is shortened, that is, the occupied space is reduced, and then the size space of the grounding switch is reduced to meet the needs of engineering applications.

[0060] In order to facilitate understanding of the technical solution provided by this embodiment, the technical terms in this field are explained as follows:

[0061] Earthing switch: A mechanical switching device used in high-voltage switchgear to ground a circuit. Under abnormal conditions (such as short circuit), it can carry a specified abnormal current for a specified time; but under normal circuit conditions, it is not required to carry current.

[0062] Moving side: The side connected to the operating mechanism, the side where the moving contact moves during the opening and closing process of the grounding switch.

[0063] Static side: The side that remains stationary during the opening and closing process of the grounding switch.

[0064] Contact finger: A part that makes sliding contact with the moving contact on the moving side or the static side during the opening and closing process, and serves as an electrical connection.

[0065] like Figure 3 , Figure 4 and Figure 5 As shown, specifically Figure 5 As shown, this embodiment provides a transmission structure for a grounding switch, including a fan-shaped crank arm 8; the outer edge of the fan-shaped crank arm 8 is a track 81 for inserting a first shaft pin 5; the first shaft pin 5 is connected to the moving contact 2 of the grounding switch, and is used to drive the moving contact 2 to move vertically. The track 81 of the fan-shaped crank arm 8, the track centerline 813 is the centerline of the track 81; the track 81 is composed of a variable radius section 841, a transition arc section 842, and a self-locking section 831; wherein, the difference between the radius 821Ro of the track centerline 813 and the radius 822Rc of the closing position during the movement of the second shaft pin 9 (i.e., Rc-Ro) determines the travel of the switch.

[0066] In this embodiment, when the grounding switch moves to the opening position, the difference should not be less than 1 / 2 of the closing position radius 822Rc; if the difference is less than 1 / 2Rc, the radius drop will be too small, requiring a larger sector radius. At the same time, the lateral force generated on the first track surface 811 and the second track surface 812 is too large, and the closing and opening operation efficiency is low. Near the closing position, a track self-locking section 831 is provided. The radius of the track self-locking section 831 remains unchanged, and the corresponding track self-locking surface 832. The center of the track self-locking section 831 and the track self-locking surface 832 are on the self-locking circle center line 833. According to different strokes, it is necessary to move on the self-locking circle center line 833. The self-locking circle center line 833 passes through the rotation center 84 of the sector arm 8. When the moving contact 2 is in the closing position, the first roller 15 contacts the track self-locking surface 832. When a fault current occurs in the closing position, the moving contact 2 is subjected to The electric force is transmitted to the track self-locking surface 832 through the first shaft pin 5 along the contact movement opening direction, and then transmitted to the rotating shaft 91, thereby overcoming the electric force and realizing the self-locking function in the closed position; there is also a variable radius section 841 on the track center line 813, and the variable radius section 841 and the track self-locking section 831 are connected by a transition arc section 842; the arc radius of the transition arc section 842 must be larger than the diameter of the first roller 15 to ensure that the first roller 15 does not get stuck during the reciprocating motion from the variable radius section 841 to the track center line 831.

[0067] like Figure 4 As shown, in this embodiment, a first shaft sleeve 13 , a first retaining ring 14 , a first roller 15 , a second roller 16 , and a second shaft sleeve 17 are installed on the first shaft pin 5 ; the first shaft pin 5 is connected to the moving contact 2 through a joint 21 .

[0068] Among them, the second sleeve 17 is arranged between the joint 21 and the second roller 16, and the first sleeve 13 is between the first roller 15 and the second roller 16 to ensure the relative position between the first roller 15 and the second roller 16; the first retaining ring 14 is installed at the outermost end of the first shaft pin 5 to prevent the first sleeve 13, the first roller 15, the second roller 16, and the second sleeve 17 from falling out; gaskets are installed between the first sleeve 13, the first retaining ring 14, the first roller 15, the second roller 16, and the second sleeve 17 to ensure that the above-mentioned sleeves and rollers are independent of each other and do not affect the movement flexibility of the rollers.

[0069] Combination Figure 3 , Figure 4 and Figure 5 As shown, this embodiment provides a working principle of a transmission structure for a grounding switch:

[0070] The current grounding switch state is the closed state. The grounding switch needs to realize the opening and closing actions. A torque is applied to the fan-shaped crank arm 8 to rotate the fan-shaped crank arm 8 around the second shaft pin 9. The opening direction 7 is the opening direction of the fan-shaped crank arm 8, and the opposite closing direction 6 is the closing direction of the fan-shaped crank arm 8. One end of the first shaft pin 5 is connected to the joint 21 on the moving contact 2, and the other end of the first shaft pin 5 is installed with the first roller 15. The first roller 15 moves along the track center line 813 of the track 81 in the track 81 as the fan-shaped crank arm 8 rotates in opening and closing. The radius change from each point on the track center line 813 to the center of the second shaft pin 9 drives the moving contact 2 to move in the contact movement direction to complete the switch opening and closing actions.

[0071] Example 2

[0072] like Figure 3 and Figure 4 As shown, this embodiment further provides a grounding switch, which includes the above-mentioned transmission structure for the grounding switch and a grounding switch body.

[0073] The grounding switch body comprises a stationary contact 1, a moving contact 2, a moving contact 3 and a housing 4; a transmission structure for the grounding switch is mounted on the housing 4.

[0074] In this embodiment, the current enters from the current inflow surface 111 of the static side contact 1, flows to the moving contact 2 through the contact structure of the static side contact 1, and then the moving contact 2 conducts the current to the shell 4 through the contact finger 31 in the moving side contact 3, and then the current is transmitted from the connected part above the shell 4. This is a current conduction circuit.

[0075] like Figure 4As shown, in this embodiment, in the moving direction of the moving contact 2, the first guide surface 411 and the second guide surface 412 on both sides of the square hole 41 on the housing 4 serve as guide surfaces for the second roller 16; in the opening movement of the moving contact 2, the fan-shaped crank arm 8 rotates along the opening direction 7, and the first roller 15 rolls on the first track surface 811 of the track 81. At the same time, the first track surface 811 generates an oblique downward force, pressing the first shaft pin 5 to move vertically downward, and the second roller 16 rolls on the surface of the second guide surface 412 (for overcoming the lateral force generated by the first track surface 811); in the closing movement of the moving contact 2, the fan-shaped crank arm 8 Rotating along the closing direction 6, the first roller 15 rolls on the second track surface 812 (lower side) of the track 81, and at the same time, the second track surface 812 generates an oblique upward force, pressing the first shaft pin 5 to move vertically upward, and the second roller 16 rolls on the surface of the first guide surface 411 (for overcoming the lateral force generated by the second track surface 812); that is, the second track surface 812 and the top 811 of the fan-shaped crank arm 8 provide vertical power; the guide surfaces of the first guide surface 411 and the second guide surface 412 of the shell 4 overcome the lateral forces generated by the second track surface 812 and the first track surface 811 to ensure vertical stability.

[0076] In this embodiment, in order to ensure that the moving contact 2 is reliable in the direction of movement, a first guide groove 321 is provided on the shielding cover 32 on the moving side contact 3, and a second guide groove 42 is provided on the shell 4; the first guide ring 10 and the second guide ring 12 are installed in the two guide grooves, thereby ensuring that the contact 2 will not deviate in the direction of movement.

[0077] It can be seen that the grounding switch provided in this embodiment firstly realizes the compactness of the structure and the integration of functions by integrating the transmission structure for the grounding switch with the grounding switch body, thereby improving the overall performance and reliability of the equipment; due to the use of a variable radius transmission structure, the overall size is reduced, meeting the application requirements; secondly, the designed current conduction circuit ensures that the current is smoothly transmitted from the static side contact to the moving contact, and then through the contact finger in the moving side contact to the housing and out, with a clear path and high conduction efficiency, which is conducive to the stable operation of the power system. In addition, by setting the first guide surface and the second guide surface as the guide surface of the second roller in the direction of movement of the moving contact, and by using the rotation of the fan-shaped crank arm and the rolling contact of the roller, the moving contact is realized to achieve smooth movement during the opening and closing process, effectively overcome the lateral force, and ensure the accuracy and reliability of the contact action. Finally, the first guide groove and the second guide groove are respectively set on the moving side contact and the housing, and a guide ring is installed, which further enhances the stability and accuracy of the moving contact in the direction of movement, prevents the occurrence of deviation, and thus improves the overall operation quality and safety of the grounding switch.

[0078] The present invention provides a transmission structure for a grounding switch, which has the following advantages over the existing grounding switch transmission structure:

[0079] First, compact structure and efficient transmission: By designing the fan-shaped crank arm and the track on it, combined with the ingenious layout of the first and second axis pins, the up and down movement of the moving contact is realized, thereby completing the opening and closing action of the grounding switch. Due to the design of the variable radius fan-shaped crank arm, the transmission stroke is shortened, and there is no need to occupy too much internal space of the grounding switch, which reduces the size of the grounding switch and meets the needs of engineering applications; this transmission structure is compact, the transmission efficiency is high, and energy loss and mechanical wear are reduced.

[0080] Second, flexibility and stability: The fan-shaped arm adopts a variable radius setting, so that the distance from the first axis pin to the second axis pin can be gradually increased or decreased as needed, thereby flexibly controlling the movement of the moving contact. At the same time, the design of the track self-locking section ensures that the distance between the first axis pin and the second axis pin remains unchanged at a specific position (such as the closing position), enhancing the stability of the system.

[0081] Third, precise control of the stroke: By defining the radius of the closing position and the radius during the movement, and stipulating the relationship between the stroke of the grounding switch and these radii, precise control of the stroke of the grounding switch is achieved. This design helps ensure that the grounding switch can accurately and reliably complete the opening and closing actions under different working conditions.

[0082] Fourth, reduce friction and wear: respectively set the first roller on the end of the first shaft pin and the transition arc segment and ensure that the transition arc segment is larger than the roller diameter, which effectively reduces the friction and wear during the movement and prolongs the service life of the equipment.

[0083] Fifth, enhance guidance and stability: a square hole is opened on the housing, and the second roller cooperates with the square hole to further enhance the guidance and stability of the moving contact in the direction of movement. At the same time, the first sleeve, the second sleeve and the retaining ring also play a protective and supporting role.

[0084] Sixth, easy installation and maintenance: the fan-shaped crank arm is movably connected to the housing through a rotating shaft, so that the entire transmission structure is easy to install and disassemble, which is convenient for subsequent maintenance and overhaul work.

[0085] The above embodiment is only one of the implementation methods that can realize the technical solution of the present invention. The scope of protection claimed by the present invention is not limited only to this embodiment, but also includes changes, replacements and other implementation methods that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed by the present invention.

Claims

1. A transmission structure for a grounding switch, characterized in that: Comprising a fan-shaped crank arm (8); A track (81) is provided on the edge of the fan-shaped turning arm (8); A first shaft pin (5) capable of moving in a vertical direction is inserted into the track (81), and the first shaft pin (5) is used to connect a moving contact (2) of a grounding switch; The fan-shaped turning arm (8) is set with a variable radius, and the radius of the fan-shaped turning arm (8) gradually increases from one side of the fan-shaped turning arm (8) to the other side; A second shaft pin (9) is inserted at the rotation center of the fan-shaped crank arm (8); The fan-shaped crank arm (8) can rotate clockwise or counterclockwise with the second shaft pin (9) as the axis, so that the distance from the first shaft pin (5) to the second shaft pin (9) gradually increases or decreases, and the track (81) drives the first shaft pin (5) to move upward or downward in the vertical direction, so as to drive the moving contact (2) to move up and down to complete the opening and closing action of the grounding switch.

2. A transmission structure for a grounding switch according to claim 1, characterized in that: The track (81) comprises a variable radius section (841), a transition arc section (842) and a track self-locking section (831) which are connected in sequence; wherein the track self-locking section (831) is arranged in a horizontal structure; when the first axle pin (5) is located at any point on the track self-locking section (831), the distance between the first axle pin (5) and the second axle pin (9) remains unchanged.

3. The transmission structure for a grounding switch according to claim 2, characterized in that: The stroke of the grounding switch is equal to the difference between the radius (822) at the closing position and the radius (821) during the movement process; wherein the radius (822) at the closing position is the distance from the first shaft pin (5) to the second shaft pin (9) in the closing state; and the radius (821) during the movement process is the distance from the first shaft pin (5) to the second shaft pin (9) during the movement of the track (81).

4. The transmission structure for a grounding switch according to claim 3, characterized in that: The stroke of the grounding switch is ≥ half of the radius (822) of the closing position.

5. The transmission structure for a grounding switch according to claim 2, characterized in that: The end of the first shaft pin (5) is provided with a first roller (15) which is slidably matched with the track (81); and the transition arc segment (842) is larger than the diameter of the first roller (15).

6. The transmission structure for the grounding switch according to claim 5, characterized in that: A square hole (41) is provided on the housing (4) of the grounding switch, and the second roller (16) of the first shaft pin (5) is inserted into the square hole (41) and can move up and down along the square hole (41); One end of the first shaft pin (5) is connected to the moving contact (2) via a joint (21), and the other end is sleeved with a first shaft sleeve (13), wherein the first shaft sleeve (13) is located between the first roller (15) and the second roller (16); a retaining ring (14) is provided at the end of the first shaft pin (5); A second shaft sleeve (17) is provided between the second roller (16) and the joint (21), and the second shaft sleeve (17) is sleeved on the first shaft pin (5).

7. The transmission structure for the grounding switch according to claim 1, characterized in that: The second shaft pin (9) is connected to a rotating shaft (91), and the fan-shaped crank arm (8) is movably connected to the housing (4) of the grounding switch via the rotating shaft (91).

8. A grounding switch, characterized in that: It comprises the transmission structure for the grounding switch according to any one of claims 1 to 7 and a grounding switch body; The switch body comprises a stationary contact (1), a movable contact (3) and a housing (4); The movable side contact (3) is located in the housing (4), and a contact finger (31) is arranged inside the movable side contact (3).

9. The grounding switch according to claim 8, characterized in that: The movable contact (3) is provided with a shielding cover (32); the shielding cover (32) is provided with a first guide groove (321); the housing (4) is provided with a second guide groove (42); the first guide groove (321) cooperates with the second guide groove (42) to guide the movable contact (2).

10. A working method of a transmission structure for a grounding switch, characterized in that: The transmission structure for a grounding switch according to any one of claims 1 to 7 comprises: The fan-shaped crank arm (8) rotates in the closing direction (6) under the action of the driving force, so that the distance between the first shaft pin (5) and the second shaft pin (9) gradually increases, and then the first shaft pin (5) drives the moving contact (2) to move upward in the vertical direction to achieve closing; The fan-shaped crank arm (8) rotates in the opening direction (7) under the action of the driving force, so that the distance from the first shaft pin (5) to the second shaft pin (9) gradually decreases, and then the first shaft pin (5) drives the moving contact (2) to move downward in the vertical direction to achieve opening.

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