A miniaturized dual-motor three-position operating mechanism

Abstract

This invention discloses a miniaturized dual-motor three-position operating mechanism, including a mechanism housing, a core mechanism and a motor disposed within the mechanism housing. The core mechanism includes a manual shaft driven by the motor or manually, a worm gear coaxially distributed with the manual shaft and capable of being driven to rotate by the manual shaft, a worm wheel meshing with the worm gear, a drive crank arm driven to rotate synchronously by the worm wheel, a drive plate driven to rotate by the drive crank arm, and an output shaft driven to rotate by the drive plate to output angle and torque. The manual shaft and the worm gear are connected by a mechanical clutch. The core mechanism also includes a pull plate driven by the worm wheel, capable of linear reciprocating motion in a first direction and a reverse second direction. The axial direction of the worm gear is parallel to the first direction. The pull plate is provided with a disengagement adjustment screw that can disengage the mechanical clutch from the manual shaft by applying force to the mechanical clutch, and a closing adjustment screw that can disengage the mechanical clutch from the worm gear by applying force to the mechanical clutch.

Description

Technical Field

[0001] This invention relates to a switch operating mechanism, and more particularly to a miniaturized dual-motor three-position operating mechanism. Background Technology

[0002] High-voltage switchgear is generally classified into the following three types: The first type is conventional air-insulated switchgear, abbreviated as AIS, in which the busbars are exposed and directly in contact with the air, and the circuit breakers can be porcelain column type or tank type; the second type is hybrid switchgear, abbreviated as H-GIS, in which the busbars are open type; the third type is sulfur hexafluoride gas-insulated fully enclosed switchgear, abbreviated as GIS.

[0003] With the development of the national economy, the power industry has seen a booming state. The new type of GIS that uses SF6 gas as the insulating medium has a small footprint, is lightweight, and is easy to standardize. It is being used more and more in substations, especially at voltage levels of 110 kV and above, where most of them use this type of switch combination.

[0004] In GIS switchgear, isolating and grounding switches are crucial components. Due to considerations of interlocking convenience and cost, combining isolating and grounding switches within a single tank has become the mainstream design approach. In China, the vast majority of 110kV GIS isolating and grounding switches are shared-tank assemblies, and this is increasingly common in 220kV GIS switches. In recent years, leading domestic switchgear manufacturers (such as Henan Pingdingshan High Voltage Switch Co., Ltd.) have also adopted shared-tank assemblies for 550kV GIS switches. Because the isolating and grounding switches are combined and housed in a single chamber, the size of the GIS is significantly reduced, making it more compact. After the combination, the operating mechanism changes from a two-position mechanism that independently operates either the isolating or grounding switch to a three-position mechanism that can operate both. The three positions refer to three working positions: 1. the closed position with the main disconnect of the isolating switch connected; 2. the isolating position with the main disconnect separated; and 3. the grounding position on the grounding side. A three-position switch integrates the functions of both a disconnector and a grounding switch, all accomplished by a single switch. This allows for mechanical interlocking, preventing the grounding switch from being closed while the main circuit is energized, and avoiding the possibility of misoperation.

[0005] Existing three-position mechanisms generally fall into two categories. One type uses two motors and two sets of drive units, combined into a single output via a crank-groove structure, commonly known as a dual-motor three-position mechanism. Because this dual-motor three-position mechanism combines two two-position mechanisms into one three-position mechanism, the limit switch at the open position can be easily implemented in each of their respective drive systems. Similarly, this dual-motor three-position mechanism can also easily incorporate mechanical clutches into its respective drive systems as needed. However, due to the presence of two sets of drive units, this type of three-position mechanism is structurally complex, bulky, costly, and difficult to maintain. The other type is a single-motor three-position mechanism with one motor and one drive unit directly outputting the signal. This single-motor three-position mechanism has a simpler structure and is more suitable for the requirements of shared-enclosure GIS in terms of appearance, production cost, and product maintenance compared to the dual-motor three-position mechanism. However, because this single-motor three-position mechanism only has one set of drive units, the limit switch at the open position and the separation become contradictory during the operation of the switch grounding-opening-isolation or isolating-opening-grounding process. It is precisely because of this interference between the limit switch and the separation at the open position that it is very difficult to add a mechanical clutch. Therefore, most of the existing single-motor three-position mechanisms on the market only have mechanical limits at the grounding and isolation positions, while the open position does not have a mechanical limit and is controlled only by a limit switch. As a result, the reliability of existing single-motor three-position mechanisms is worse than that of dual-motor three-position mechanisms.

[0006] A dual-motor three-position operating mechanism, such as the novel three-position operating mechanism disclosed in Chinese Patent Application No. 201620176321.1, includes a motor, a transmission system, a transmission bracket, and a limit switch. The transmission system is set in the transmission bracket and includes a lead screw, a lead screw nut, a grooved wheel plate, and an output shaft. Two motors are fixed at one end of the transmission bracket, and two lead screws are fixed on both sides of the transmission bracket and directly connected to different motors respectively. Each lead screw is provided with a lead screw nut. The grooved wheel plate is driven to rotate by the lifting of the lead screw nut. An arc-shaped groove is provided on the grooved wheel plate, and a gear is provided inside the arc-shaped groove. The output shaft is set in the arc-shaped groove, and a gear is provided on the output shaft that meshes with the gear inside the arc-shaped groove.

[0007] In such a mechanism, the motor overshoot due to inertia can cause impact on the mechanism and the stationary contact of the switch. Existing technologies have addressed this issue by incorporating a clutch device, but commonly used clutch devices are located at the bottom or side of the mechanism and cannot be easily adjusted according to actual usage to avoid errors in the termination position. Summary of the Invention

[0008] The technical problem to be solved by the present invention is to provide a miniaturized dual-motor three-position operating mechanism that avoids the impact caused by motor inertia overshoot, and is easy to adjust to meet the required termination position.

[0009] The technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows: a miniaturized dual-motor three-position operating mechanism, including a mechanism box, a core mechanism and a motor disposed in the mechanism box, the core mechanism including a manual shaft driven by the motor or manually, the core mechanism also including a worm gear coaxially distributed with the manual shaft so as to be driven to rotate by the manual shaft, a worm wheel meshing with the worm gear, a drive crank arm driven to rotate synchronously by the worm wheel, a drive plate driven to rotate by the drive crank arm, and an output shaft driven to rotate by the drive plate to output angle and torque, characterized in that: the manual shaft and the worm gear are connected by a mechanical clutch, the core mechanism also includes a pull plate driven by the worm wheel to perform linear reciprocating motion in a first direction and a reverse second direction, the axial direction of the worm gear is parallel to the first direction, the pull plate is provided with a disengagement adjustment screw that can disengage the mechanical clutch and the manual shaft by applying force to the mechanical clutch, and a closing adjustment screw that can disengage the mechanical clutch and the worm gear by applying force to the mechanical clutch.

[0010] Preferably, to facilitate the disengagement of the mechanical clutch from the manual shaft and worm gear via linear motion of the opening and closing adjusting screws, the mechanical clutch is structured as follows: the mechanical clutch includes a sleeve, a clutch part that moves linearly synchronously with the sleeve and can rotate relative to it, a first clutch pin located at the end of the manual shaft, and a second clutch pin located at the end of the worm gear. The ends of the manual shaft and worm gear with the clutch pins extend into the sleeve, respectively. The sleeve has a first limiting groove extending axially from the end near the manual shaft to the direction away from the manual shaft, and a second limiting groove extending axially from the end near the worm gear to the direction away from the manual shaft. The worm gear has a second limiting groove extending axially. The first clutch shaft pin can be engaged in the first limiting groove to make the manual shaft and sleeve rotate synchronously. The second clutch shaft pin can be engaged in the second limiting groove to make the worm gear and sleeve rotate synchronously. When the pull plate moves in the first direction, the closing adjustment screw applies force to the clutch part to disengage the second clutch shaft pin and the second limiting groove, thereby disengaging the mechanical clutch and the worm gear. When the pull plate moves in the second direction, the opening adjustment screw applies force to the clutch part to disengage the first clutch shaft pin and the first limiting groove, thereby disengaging the mechanical clutch and the manual shaft.

[0011] To facilitate linear movement of the sleeve with the clutch and to allow the clutch to rotate first, while also facilitating the correction of errors in the termination position of the operating mechanism, a radially inwardly recessed annular groove is formed on the outer periphery of the sleeve. The clutch is engaged in the annular groove to achieve synchronous linear movement with the sleeve and to rotate relative to the sleeve. An installation groove is provided on the pull plate, and the opening adjustment screw and the closing adjustment screw are respectively threaded to the two ends of the installation groove along the movement direction of the pull plate. The clutch has a push plate extending into the installation groove for interacting with the opening adjustment screw and the closing adjustment screw.

[0012] To facilitate the reset of the mechanical clutch after the operating mechanism has completed its operation, the mechanism also includes two first bearing seats fixed inside the mechanism housing. The mechanical clutch is located between the two first bearing seats, and two connecting rods are connected between the two first bearing seats. Through holes are provided on both sides of the clutch part and at the positions corresponding to the connecting rods. Each connecting rod passes through the through hole and its two ends are connected to the corresponding first bearing seat. Springs that can push the clutch part to reset are provided on both sides of each connecting rod.

[0013] To facilitate the automatic disconnection of the motor power supply and output of the corresponding signal when the opening and closing operations are completed, the mechanism also includes a limit switch switching block set on the pull plate. The limit switch switching block has two blocks respectively corresponding to the closing and opening operations, and they are arranged at intervals along the first direction. A limit switch is set in the mechanism box at the position corresponding to each limit switch switching block.

[0014] To facilitate the adjustment of the two adjusting screws of the mechanical clutch, a cover is also included on the front side of the mechanism box. The mechanism also includes a rear plate fixedly connected to the mechanism box, a front plate spaced apart on the front side of the rear plate, a worm gear rotatably disposed between the front plate and the rear plate, a drive crank arm and a drive plate located on the rear side of the rear plate, and a pull plate slidably disposed on the front side of the front plate.

[0015] To facilitate the linear motion of the pull plate driven by the worm gear, the mechanism also includes a half-tooth crank arm coaxial with and rotating synchronously with the worm gear, and a rack meshing with the half-tooth crank arm. The rack and the pull plate are connected and fixed, so that the rotation of the worm gear can drive the pull plate to move linearly. Alternatively, other rotation-to-linear motion conversion transmission mechanisms can be provided between the worm gear and the pull plate.

[0016] To further limit the travel of the worm gear and the drive crank arm, the mechanism also includes a closing limit screw that cooperates with the worm gear to limit the rotation position of the worm gear, and a closing limit screw that cooperates with the drive crank arm to limit the rotation position of the drive crank arm. The worm gear is fan-shaped. The closing limit screw is located between the front plate and the rear plate and adjacent to the worm gear. The closing limit screw is located on the rear side of the rear plate and adjacent to the drive crank arm.

[0017] Preferably, in order to make reasonable use of the space inside the mechanism box and reduce the overall thickness and width of the mechanism box, the combination of the motor, manual shaft, worm gear, mechanical clutch, worm wheel, drive crank arm and pull plate has two sets that are symmetrically arranged and correspond to isolation and grounding operations respectively.

[0018] To facilitate the installation and maintenance of the operating mechanism, mounting lugs for mounting the operating mechanism onto the switch are welded onto the mechanism housing.

[0019] Compared with the prior art, the advantages of this invention are as follows: by setting a mechanical clutch between the worm gear and the manual shaft, the mechanism is safer and more reliable, especially when using an AC / DC dual-purpose motor, it can prevent the inertial overshoot of the motor from impacting the mechanism and the stationary contact of the switch, and it is easy to adjust; the core is symmetrically arranged and integrated, so the isolation and grounding can be interchanged, and the main moving parts, control parts and output parts are combined on the core, which is convenient for testing; the reasonable layout allows the thickness and width of the mechanism box and the box cover to be greatly reduced, and the external mounting method of the lifting lug is very suitable, which is very suitable for the installation and maintenance of the operating mechanism. Attached Figure Description

[0020] Figure 1 This is an isometric view (viewed from front to back) of the three-position operating mechanism according to an embodiment of the present invention;

[0021] Figure 2 This is an isometric view (viewed from back to front) of the three-position operating mechanism according to an embodiment of the present invention;

[0022] Figure 3 This is a schematic diagram of the bottom surface of the three-position operating mechanism according to an embodiment of the present invention;

[0023] Figure 4 This is a front view of the hidden cover of the three-position operating mechanism according to an embodiment of the present invention;

[0024] Figure 5 for Figure 4 Sectional view along axis AA;

[0025] Figure 6 This is an isometric view of the mechanism of the three-position operating mechanism according to an embodiment of the present invention;

[0026] Figure 7 This is a front view of the mechanism of the three-position operating mechanism according to an embodiment of the present invention;

[0027] Figure 8 This is a rear view of the mechanism of the three-position operating mechanism according to an embodiment of the present invention;

[0028] Figure 9 This is a partially exploded schematic diagram of the mechanism of the three-position operating mechanism according to an embodiment of the present invention;

[0029] Figure 10 for Figure 4 BB-direction sectional view;

[0030] Figure 11 for Figure 4 CC-direction sectional view;

[0031] Figure 12 for Figure 4 DD section view;

[0032] Figure 13 This is a schematic diagram showing the connection state of the manual shaft, mechanical clutch, and worm gear of the three-position operating mechanism according to an embodiment of the present invention.

[0033] Figure 14 This is a schematic diagram showing the connection state of the manual shaft, mechanical clutch, and worm gear of the three-position operating mechanism according to an embodiment of the present invention (and...). Figure 13 (Different perspectives);

[0034] Figure 15 This is an exploded structural diagram of the manual shaft, mechanical clutch, and worm gear of the three-position operating mechanism according to an embodiment of the present invention.

[0035] Figure 16 This is an exploded structural diagram of the mechanical clutch of the three-position operating mechanism according to an embodiment of the present invention. Detailed Implementation

[0036] The embodiments of the present invention are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions.

[0037] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Since the embodiments disclosed in this invention can be arranged in different directions, these terms indicating direction are only for illustration and should not be regarded as limitations. For example, "upper" and "lower" are not necessarily limited to directions opposite to or consistent with the direction of gravity. In addition, features defined with "first" and "second" may explicitly or implicitly include one or more of such features.

[0038] See Figures 1-3This invention relates to a miniaturized dual-motor three-position operating mechanism, ideally suited for three-position systems used in GIS (Gas Infrared) systems, particularly in dual-busbar layouts. The mechanism comprises a housing 1 and a cover 2. The housing 1 is a crucial component, supporting both internal and external parts of the operating mechanism and serving as a connection point for switches. The housing 1 has an open front, and the cover 2 is detachably fitted over the front of the housing 1. The housing 1 and cover 2 together form a flat, hollow cuboid. The housing 1 and cover 2 are connected by a latch 11, facilitating easy assembly and disassembly. The latch 11 can be positioned on either the left or right side of the housing 1 or cover 2. A sealing gasket is installed at the contact surface between the housing 1 and cover 2 to ensure rain protection. A lifting ring 12 is also provided at the latch 11; this ring can rotate and be easily removed, greatly facilitating lifting operations within the confined spaces of a GIS system. The cover 2 is equipped with a nameplate 21, which indicates important information about the mechanism, such as the model number, motor power supply, control power supply, operating time, manufacturing date, product number, and manufacturer.

[0039] Mounting lugs 31 are welded onto the mechanism housing 1. Screws can be passed through these lugs to mount the entire operating mechanism onto the switch. To ensure balance after installation, lugs 31 are installed on both the left and right sides of the mechanism housing 1. In this embodiment, more preferably, two mounting lugs 31 are arranged vertically spaced on each side. A through hole 13 is provided on the back of the mechanism housing 1, exposing the output shaft 50 of the entire mechanism (described in detail below). The output shaft 50 is used to connect to the drive shaft of the switch to transmit the movement of the operating mechanism.

[0040] The side of the mechanism housing 1 is also equipped with an aviation connector 32, a respirator 33, and a grounding screw 34. The aviation connector 32 is connected to a switch via a cable, providing power, operating signals, and auxiliary output signals to the entire operating mechanism. An opening is made in the mechanism housing 1 corresponding to the respirator 33. The respirator 33 contains a wire mesh, allowing ventilation of the entire operating mechanism and keeping it dry. The grounding screw 34 is connected with a grounding wire to ground the entire operating mechanism, ensuring safety. The aviation connector 32 and grounding screw 34 can be located on the left and right sides of the mechanism housing 1, while the respirator 33 can be located on the left and right sides and the top surface of the mechanism housing 1.

[0041] The bottom surface of the mechanism housing 1 is equipped with an indicator 35 and a cover 36. Two covers 36 are spaced apart on the left and right sides, each with a printed manual operation indicator. A manual cover plate 37 is also provided between the cover 36 facing inwards from the mechanism housing 1 and the cover 36 itself. The manual cover plate 37 is welded with a screw 371 and a lock lug 372. When the mechanism is operated electrically, the wing nut 381 is tightened, and the lock 382 is engaged. When operated manually, the lock 382 is removed, the wing nut 381 is loosened, the cover 36 is removed, and the manual cover plate 37 is unscrewed, releasing the manual / electric interlock switch 95 (described in detail below). The operating mechanism has no internal power supply, ensuring safety and reliability.

[0042] A manual operation indicator 391 is also provided between the two covers 36, indicating the grounding operation port and the isolation operation port, making it easy to distinguish the location of the manual operation port 14 (described in detail below) during manual operation. A split / open indicator 392 is also provided at a corresponding position on each cover 36, indicating split and open arrows; manual operation is performed according to the direction of the arrows. The indicator 35 is partially transparent and spherical, and the movement within the operating mechanism is synchronously displayed on the indicator 35.

[0043] See Figure 4 and Figure 5 The components inside the mechanism housing 1 are arranged symmetrically from left to right. The mechanism housing 1 houses a core 5 and two motors 7 that provide power to the core 5. Each motor 7 is mounted on a motor mounting plate 71, which is fixed to a welded sleeve inside the mechanism housing 1 with screws. A motor gear 72 is mounted on the output shaft of each motor 7, and the motor gear 72 moves synchronously with the motor 7. In this embodiment, the manual operation indicator 391 on the left cover 36 displays an isolation operation port, and the manual operation indicator 391 on the right cover 36 displays a grounding operation port. Therefore, the left motor 7 corresponds to the isolation operation, and the right motor 7 corresponds to the grounding operation.

[0044] See also Figures 6-9 Movement 5 also adopts a symmetrical layout, including two sets of worm gear and clutch transmission structures. The movement is driven by the drive plate to output the output shaft. It also has two sets of stroke switching devices and two sets of auxiliary signal output devices. The structure of movement 5 will be described in detail below.

[0045] The mechanism 5 is a crucial module for transmitting the motion of the motor 7 through the operating mechanism. It includes the aforementioned output shaft 50, manual shaft 51, front plate 52, and rear plate 53. The front plate 52 is spaced apart on the front side of the rear plate 53 and the two are connected and fixed together. The rear plate 53 is fixed inside the mechanism housing 1 with screws. Both the front plate 52 and the rear plate 53 can be roughly T-shaped, with most components of the mechanism 5 located between them. There are two manual shafts 51, each equipped with a transmission gear 511. The transmission gear 511 meshes with a corresponding motor gear 72, allowing the motor 7 to rotate by driving the transmission gear 511 through the motor gear 72. Similarly, operating the manual shaft 51 transmits force to the motor 7. In this embodiment, the manual shaft 51 is positioned on the side of one motor 7 facing the other, i.e., the two manual shafts 51 are located between the two motors 7, and the manual shafts 51 and the output shafts of the motors 7 are parallel. In this embodiment, the left manual shaft 51 corresponds to isolation operation, and the right manual shaft 51 corresponds to grounding operation.

[0046] The mechanism 5 also includes two worm gears 54, each worm gear 54 being connected to a corresponding manual shaft 51 via a mechanical clutch 55. The worm gear 54 and the corresponding manual shaft 51 are coaxially arranged, allowing the manual shaft 51 and worm gear 54 to rotate synchronously or disengage during operation. The manual shaft 51 is supported by a support base 512. First bearing seats 541 are provided at the connection points of the manual shaft 51 and the mechanical clutch 55, the connection points of the mechanical clutch 55 and the worm gear 54, and at the end of the worm gear 54 furthest from the mechanical clutch 55. Each first bearing seat 541 contains a first rolling bearing 542. The worm gear 54 and the manual shaft 51 pass through the first rolling bearings 542 and are arranged coaxially. The support base 512 and each first bearing seat 541 are fixed between the front plate 52 and the rear plate 53, respectively.

[0047] Each worm 54 is fitted with a worm wheel 56 on its side. The worm wheel 56 is fan-shaped, and its center is fitted onto the worm wheel shaft 562 via a flat key 561. Each end of the worm wheel shaft 562 is provided with a second rolling bearing 563, which is mounted in a second bearing housing 564. The second bearing housing 564 is connected and fixed to the front plate 52 and the rear plate 53, respectively. (See also...) Figures 10-12The second bearing housing 564 has a step to ensure that the worm gear shaft 562 does not escape between the front plate 52 and the rear plate 53, confining the worm gear shaft 562 between the front plate 52 and the rear plate 53, and allowing it to rotate relative to the front plate 52 and the rear plate 53. Each end of the worm gear shaft 562 is machined with an external hexagonal shape, and the center of the external hexagonal shape has a threaded hole. A half-tooth crank arm 57 is mounted on the front end of the worm gear shaft 562, and a drive crank arm 58 is mounted on the rear end of the worm gear shaft 562. The movement of the motor 7 or the manual shaft 51 is transmitted to the drive crank arm 58 and the half-tooth crank arm 57 through the mechanical clutch 55, worm 54, worm gear 56, and worm gear shaft 562, and the movement is synchronous. The half-tooth crank arm 57 is located on the front side of the front plate 52, and the drive crank arm 58 is located on the rear side of the rear plate 53.

[0048] A drive plate 59 is provided on the rear side of the rear plate 53. The drive plate 59 is preferably arched and is rotatably connected to the rear plate 53 at its center. A drive pin 581 is provided at the end of the drive crank arm 58 away from the worm gear shaft 562. A guide groove 591 is provided on the drive plate 59. The guide groove 591 is preferably an oblong groove. The drive pin 581 is engaged in the guide groove 591, so that when the drive crank arm 58 rotates, it can push the drive plate 59 to rotate around its center. The two guide grooves 591 extend upwards at an angle towards each other. An arc-shaped internal gear groove 592 is provided above the guide groove 591. The internal gear groove 592 can pass through the drive plate 59 from front to back. The top surface of the internal gear groove 592 is an upwardly convex arc shape, and internal teeth 593 are provided on it facing into the internal gear groove 592. The aforementioned output shaft 50 passes through the rear plate 53 from the front side and enters the internal gear groove 592 of the drive plate 59. It passes through the through hole 13 of the mechanism box 1 so that it can contact the output shaft 50 from the outside of the mechanism box 1. The output shaft 50 is parallel to the worm gear shaft 562. The output shaft 50 is provided with external teeth 501. The external teeth 501 on the output shaft 50 mesh with the internal teeth 593 on the drive plate 59. Thus, when the drive plate 59 rotates, it can drive the output shaft 50 to rotate and output angle and torque.

[0049] The concentric shaft of the drive plate 59 is the drive shaft 60 (the pin that rotatably connects the drive plate 59 and the rear plate 53), and the two rotate synchronously. The rear end of the drive shaft 60 is machined with an external hexagonal hole and a threaded hole. The internal hexagonal hole of the drive plate 59 coincides with the internal hexagonal hole of the drive shaft 60 and is fixed by screws 601. Both ends of the output shaft 50 and the drive shaft 60 are machined with steps, and the output shaft 50 and the drive shaft 60 are parallel. In this embodiment, the output shaft 50 is located above the drive shaft 60. See also... Figure 11Third rolling bearings 602 are respectively provided at the connection points of the drive shaft 60 with the front plate 52 and the rear plate 53. Each third rolling bearing 602 is housed in a third bearing seat 603, which is fixedly connected to the corresponding front plate 52 and rear plate 53, thereby enabling the drive shaft 60 to rotate relative to the front plate 52 and the rear plate 53. Fourth bearing seats 502 are respectively provided at the connection points of the output shaft 50 with the front plate 52 and the rear plate 53. The fourth bearing seats 502 are fixedly connected to the corresponding front plate 52 and the rear plate 53, thereby enabling the output shaft 50 to rotate relative to the front plate 52 and the rear plate 53. The outer circle of the third rolling bearing 602 is concentric with the stepped third bearing housing 603, and the inner circle is concentric with the drive shaft 60. A fourth rolling bearing (not shown) can be installed in the fourth bearing housing 502. The outer circle of the fourth rolling bearing is concentric with the stepped fourth bearing housing 502, and the inner circle is concentric with the output shaft 50, ensuring that the output shaft 50 and the drive shaft 60 rotate between the front plate 52 and the rear plate 53.

[0050] A first sprocket 611 is mounted on the drive shaft 60, located between the rear plate 53 and the drive plate 59. The first sprocket 611 is situated on the upper part of the rear plate 53. The first sprocket 611 is fixedly connected to the drive shaft 60 and rotates synchronously, allowing the inner hexagon of the first sprocket 611 to coincide with the outer hexagon of the drive shaft 60, thus enabling synchronous movement of the first sprocket 611, drive shaft 60, and drive plate 59. A second sprocket 612 is mounted on the lower part of the rear plate 53 via a sprocket shaft 6121. The second sprocket 612 and sprocket shaft 6121 are connected by a key, and the sprocket shaft 6121 is parallel to the drive shaft 60. A chain 613 is wound between the first sprocket 611 and the second sprocket 612, transmitting the rotation of the first sprocket 611 to the second sprocket 612, and then to the sprocket shaft 6121. (See also...) Figure 11 The sprocket shaft 6121 passes through the rear plate 53 and the front plate 52, and can rotate relative to the front plate 52 and the rear plate 53. A bevel gear 614 is provided on the portion of the sprocket shaft 6121 located between the rear plate 53 and the front plate 52. A bevel gear shaft 5121 is rotatably mounted on the support base 512. The bevel gear 614 and the bevel gear shaft 5121 mesh, and the bevel gear shaft 5121 is parallel to the manual shaft 51. Thus, when the sprocket shaft 6121 rotates, it can drive the bevel gear shaft 5121 to rotate.

[0051] The movement 5 also includes two racks 62, each designed to engage with a half-toothed crank arm 57. The racks 62 slide against the front plate 52. The half-toothed crank arm 57 is circular, with teeth distributed around its circumference. The teeth of the racks 62 are spaced vertically, and the meshing of the teeth of the half-toothed crank arm 57 with the teeth of the racks 62 converts the circular motion of the half-toothed crank arm 57 into the linear motion of the racks 62. The racks 62 are positioned on the side of the half-toothed crank arm 57 facing the other half-toothed crank arm 57, i.e., the two racks 62 are located between the two half-toothed crank arms 57. Each rack 62 has a vertically extending first sliding groove 621. The front plate 52 has a first guide pin 622 extending into the first sliding groove 621. The first guide pin 622 can slide along the first sliding groove 621. Since the front plate 52 is fixed inside the mechanism housing 1, the racks 62 slide vertically relative to the front plate 52.

[0052] The movement 5 also includes two pull plates 63, each pull plate 63 being fixed to a corresponding rack 62. The pull plates 63 are positioned on the side of the rack 62 facing the other rack 62, i.e., the two pull plates 63 are located between the two racks 62. A second sliding groove 631 is provided on the pull plate 63, and a second guide pin 632 is provided on the front plate 52, extending into the second sliding groove 631. The second guide pin 632 can slide along the second sliding groove 631. Since the front plate 52 is fixed inside the mechanism housing 1, the pull plate 63 can slide up and down relative to the front plate 52. Each pull plate 63 may have two second sliding grooves 631, respectively located at the upper and lower ends of the pull plate 63, thereby allowing the pull plate 63 to move smoothly relative to the front plate 52.

[0053] The mechanism 5 also includes limit switch switching blocks 64 and fixing seats 65. There are two sets of limit switch switching blocks 64 and fixing seats 65, with one limit switch switching block 64 and fixing seat 65 fixed on each pull plate 63. Each set of limit switch switching blocks 64 has two blocks, located on the side of the pull plate 63 away from the other pull plate 63, with the two limit switch switching blocks 64 arranged vertically at intervals, located on the upper and lower sides of the half-tooth crank arm 57 respectively. A mounting groove 633 is also provided on the pull plate 63, between the second slide grooves 631, extending through the front and rear sides of the pull plate 63. Each set of fixing seats 65 has two blocks, located at the upper and lower ends of the mounting groove 633 respectively. The rack 62, pull plate 63, limit switch switching blocks 64, and fixing seats 65 move synchronously.

[0054] On each pull plate 63, the upper fixed seat 65 is provided with a tripping adjustment screw 661, and the lower fixed seat 66 is provided with a closing adjustment screw 662. The tripping adjustment screw 661 and the closing adjustment screw 662 can be placed in the mounting groove 633 by means of a separate fixed plate or by means of a threaded connection with the fixed seat 65. The aforementioned mechanical clutch 55 extends into the mounting groove 633. Thus, the relative position of the tripping adjustment screw 661 and the closing adjustment screw 662 with respect to the mounting groove 633 can be adjusted.

[0055] Each limit switch switching block 64 has a corresponding position equipped with a limit switch 67, which is mounted on the front plate 52 via a limit switch mounting plate 671. There are two limit switches 67, arranged at intervals along the first direction, adjacent to the pull plate 63. The upper one corresponds to the closing operation, and the lower one corresponds to the opening operation. When a limit switch 67 is activated, the corresponding indicator light illuminates.

[0056] See Figures 13-16 The mechanical clutch 55 includes a sleeve 551, a clutch portion 552, a limiting plate 553, a first clutch pin 554, and a second clutch pin 555. The sleeve 551 is a hollow cylinder with openings at both ends along the axial direction. The ends of the manual shaft 51 and the worm gear 54 extend into the sleeve 551, respectively. A radially inwardly recessed annular groove 5511 is formed on the outer circumference of the sleeve 551. The clutch portion 552 is engaged in the annular groove 5511, thereby allowing the clutch portion 552 and the sleeve 551 to move up and down synchronously, while the sleeve 551 can rotate relative to the clutch portion 552. Two connecting rods 543 are connected between the first bearing seat 541 located outside the manual shaft 51 and the first bearing seat 541 located outside the worm gear 54. The two connecting rods 543 are located on the left and right sides of the sleeve 551. The clutch part 552 has through holes 5521 on both sides, corresponding to the positions of the connecting rods 543. Each connecting rod 543 passes through the through hole 5521 and its two ends are connected to the corresponding first bearing seat 541. Each connecting rod 543 is provided with a spring 544 on the upper and lower sides of the clutch part 552. The up and down movement of the clutch part 552 can compress the spring 544 on the corresponding side. The clutch part 552 also includes a push plate 5522 extending into the mounting groove 633 of the pull plate 63, so as to cooperate with the opening adjustment screw 661 and the closing adjustment screw 662. The connecting rods 543 also guide the movement of the clutch part 552. The clutch part 552 and the sleeve 551 are fitted with a U-shaped limiting plate 553 at the opening of the U-shaped structure of the limiting plate 553, thereby limiting the position of the sleeve 551.

[0057] The lower end of the sleeve 551 has an upwardly extending first limiting groove 5512, and the upper end of the sleeve 551 has an upwardly extending second limiting groove 5513. A first clutch pin 554 is located at the upper end of the manual shaft 51, and a second clutch pin 555 is located at the lower end of the worm gear 54. The first clutch pin 554 is used to cooperate with the first limiting groove 5512, and the second clutch pin 555 is used to cooperate with the second limiting groove 5513. The first limiting groove 5512 and the second limiting groove 5513 can be arranged symmetrically along the axis. The first clutch pin 554 can be engaged into the first limiting groove 5512 from the lower end of the first limiting groove 5512 or disengaged from the first limiting groove 5512 from the lower end of the first limiting groove 5512. The second clutch pin 555 can be engaged into the second limiting groove 5513 from the upper end of the second limiting groove 5513 or disengaged from the second limiting groove 5513 from the upper end of the second limiting groove 5513.

[0058] By setting the mechanical clutch 55 in this way, the cover 2 can be easily opened to adjust the opening adjustment screw 661 or the closing adjustment screw 662.

[0059] During operation, the rotation of the half-tooth crank arm 57 drives the rack 62 and pull plate 63 to move linearly up and down, thereby causing the limit switch switching block 64, the fixed seat 65, the open adjustment screw 661, and the close adjustment screw 662 to move linearly synchronously. When the operation needs to be terminated, the open adjustment screw 661 or the close adjustment screw 662 will push the mechanical clutch 55 away, the limit switch switching block 64 will press the roller of the limit switch 67, and the motor 7 will be de-energized. If there is an error in the termination position, the open adjustment screw 661 or the close adjustment screw 662 can be adjusted to make the mechanical clutch 55 disengage earlier or later; in addition, the position of the limit switch 67 can be adjusted to make the limit switch switching block 64 contact the limit switch earlier or later, thereby making the motor 7 de-energized earlier or later, thus perfectly controlling the stroke of the operation mechanism.

[0060] A top block 634 is provided at the upper end of the pull plate 63. The top block 634 can be in the form of a cube. A counter 68 is provided at a corresponding position on the front plate 52. When the operating mechanism moves to the closed position, the top block 634 pushes the counter 68 to rotate, and the counter number increments by 1, thus visually displaying the number of times the mechanism has been operated. The counter 68 and the motor 7 are located on the upper and lower sides of the pull plate 63, respectively.

[0061] During operation, the interlocking between switches, the indication of switch positions, and the interlocking between mechanisms all require the output of corresponding auxiliary signals while the mechanisms are in motion to control or display the operational status. Therefore, the mechanism 5 also includes an auxiliary switch assembly, comprising a pin 691 connected to the half-tooth crank arm 57, a connecting plate 692 connected to the pin 691, an auxiliary switch crank arm 693, an auxiliary switch 694, and an auxiliary switch mounting plate 695. The pin 691 is parallel to the worm gear shaft 562. The connecting plate 692 extends vertically, with its upper end connected to the pin 691. The auxiliary switch 694 is mounted on the auxiliary switch mounting plate 695, which is fixed to the front plate 52. One end of the auxiliary switch crank arm 693 is rotatably connected to the connecting plate 692, and the other end is connected to the shaft of the auxiliary switch 694. In this embodiment, there are three auxiliary switches 694 for isolation and grounding operations, respectively. Correspondingly, there are also three connecting levers 692 and three auxiliary switch crank arms 693 for each group of auxiliary switches 694. Adjacent connecting levers 692 are rotatably connected, and each auxiliary switch 694 is connected to the corresponding auxiliary switch crank arm 693. When the operating mechanism moves, it drives the auxiliary switches 694 to output auxiliary signals.

[0062] In addition, four support rods 521 are connected between the front plate 52 and the rear plate 53, further securing the front plate 52 and the rear plate 53 in addition to the aforementioned bearing seats and support seats 512. A closing limit screw 663 is provided on the side of the support rod 521 located above the worm gear 56, facing the interior of the mechanism 5. A closing limit screw 664 is provided on the rear plate 53, preferably below the drive crank arm 58 and adjacent to it.

[0063] The forward and reverse rotation of the operating mechanism is controlled by relays 8. In this embodiment, four relays are provided, which respectively control the isolation on, isolation off, ground off, and ground on of the operating mechanism. Each set of relays 8 is mounted on a relay mounting plate 81, which is fixed to the mechanism housing 1.

[0064] To control the temperature and humidity inside the mechanism housing 1, the operating mechanism of the present invention further includes a temperature and humidity controller 91 and a heater 92. The temperature and humidity controller 91 is directly fixed inside the mechanism housing 1, and the heater 92 is mounted on a transition plate 93, which is mounted on the mechanism housing 1.

[0065] See Figures 3-5The operating status of the mechanism should be observed closely and displayed on the indicator 35. The component that drives the indicator 35 is mounted on the mechanism housing 1. The bevel gear shaft 5121 on the mechanism 5 is coaxially connected to the spline shaft 101. When the bevel gear shaft 5121 rotates, it can drive the spline shaft 101 to rotate synchronously. The bevel gear shaft 5121 and the spline shaft 101 are connected together by a spline sleeve. The bottom inner side of the mechanism housing 1 is provided with a copper sleeve 102, a fixing plate 103, a gear 104 and a rack plate 105. The copper sleeve 102 is mounted on the spline shaft 101 and fixed to the fixing plate 103. The outer circle of the other end of the spline shaft 101 is concentric with the inner circle of the copper sleeve 102. The outer circle of the copper sleeve 102 is concentric with the inner hole on the fixing plate 103. The fixing plate 103 is fixed to the fixing rod 106 welded to the mechanism box 1 with screws, so that the fixing plates 103 are spaced apart on the bottom of the mechanism box 1. The gear 104 is located between the fixing plate 103 and the bottom of the mechanism box 1. The end of the spline shaft 101 with the copper sleeve 102 passes through the gear 104, and there is a keyway on the outer side of this end. The gear 104 is connected with a flat key, so that the bevel gear shaft 5121, the spline shaft 101, and the gear 104 rotate synchronously.

[0066] Gear 104 meshes with the teeth on rack plate 105. Rotation of gear 104 causes rack plate 105 to move linearly left and right. Rack plate 105 has left and right extending third slide grooves 1051 on the left and right sides of gear 104. Guide rods 107 are respectively provided at the bottom of mechanism box 1. The guide rods 107 pass through the third slide grooves 1051, so that the guide rods 107 can slide relative to the third slide grooves 1051. Since the guide rods 107 are fixed, they guide the linear movement of rack plate 105.

[0067] A notch 1052 penetrating both the upper and lower surfaces of the rack plate 105 is provided on the rack plate 105, and the gear 104 is located within the notch 1052. To enable both electric and manual operation of the three-position mechanism, a manual operation port 14 is typically provided. In this embodiment, a manual operation port 14 penetrating the bottom of the mechanism box 1 is provided at a position corresponding to the manual cover plate 37, and the manual operation port 14 corresponds to the position of the manual shaft 51. When the operating mechanism is in the isolation and grounding positions, the manual operation port 14 and the notch 1052 partially overlap, allowing for manual operation. In the isolation position, the rack plate 105 moves to cover the grounding manual operation port 14, and in the grounding position, it covers the isolation manual operation port 14.

[0068] Each indicator 35 is provided with an indicator shaft 351 extending into the mechanism housing 1. The indicator shaft 351 is parallel to the spline shaft 101. An indicator crank arm 352 is provided on the indicator shaft 351. The indicator 35, indicator shaft 351 and indicator crank arm 352 can rotate synchronously. A torsion spring 353 is provided on the indicator crank arm 352. An indicator fixing plate 354 is provided at the bottom of the mechanism housing 1. The indicator crank arm 352 passes through the indicator fixing plate 354. The torsion spring 353 connects the indicator crank arm 352 and the indicator fixing plate 354. A push pin 1053 is provided at the end of each indicator crank arm 352 near the rack plate 105. When the rack plate 105 moves linearly to one side, the push pin 1053 pushes into the corresponding indicator crank arm 352 and abuts against it, which can drive the indicator crank arm 352 on that side to rotate, thereby driving the indicator 35 to rotate and display the position status of the operating mechanism. Meanwhile, the other indicator crank arm 352 is reset under the action of the torsion spring 353, and the indicator 35 displays another state of the operating mechanism.

[0069] In addition to housing the heater 92, the transition plate 93 also includes an interlocking coil bracket 94 and a manual / electric interlocking switch 95 to prevent potential manual / electric misoperation. This ensures that manual operation is only permitted when needed and not required otherwise. The interlocking coil bracket 94 houses the interlocking coil 941, preventing the manual crank handle from being inserted if manual operation conditions are not met, thus preventing misoperation. The interlocking coil bracket 94 also houses a rectifier bridge 942, which converts the AC power from the interlocking coil 941 to DC power. The roller of the manual / electric interlocking switch 95 abuts against the manual cover plate 37. When the manual cover plate 37 is in place, the roller of the manual / electric interlocking switch 95 is pressed, indicating it is in electric operation. When the manual cover plate 37 is removed, the manual / electric interlocking switch 95 is released.

[0070] When manual operation is required, open the manual cover 37 as described above to expose the corresponding manual operation port 14. The corresponding manual / electric interlock switch 95 is released. If the background signal allows manual operation, the interlock coil 941 is energized, and the interlock coil 29 attracts its iron core, causing the iron core to leave the space between the manual operation port 14 and the corresponding manual shaft 51. At this time, the manual crank handle can be inserted from the manual operation port 14 to the end connected to the manual shaft 51 for manual operation. The rotation direction of the manual shaft 51 is indicated by the arrow on the open / close indicator 392. Rotate accordingly according to the current required operation. When the background does not allow manual operation, the interlock coil 941 does not receive a signal that the manual operation mechanism is allowed. The interlock coil 941 is not energized, its iron core is not attracted, and the iron core on the interlock coil 29 blocks the space between the manual operation port 14 and the corresponding manual shaft 51 to prevent the manual crank handle from being inserted into the manual shaft 51.

[0071] The movement 5 has two sets of each component, except for the first sprocket 611, the second sprocket 612, the chain 613, and the related bevel gear 614 and bevel gear shaft 5121, which are only one set.

[0072] The operating mechanism of the present invention operates on the following principle:

[0073] I. Isolation

[0074] At this time, the left side of the mechanism 5 is activated, energizing the left motor 7 and one of the corresponding relays 8 (or by inserting the manual crank to operate the left manual shaft 51). The corresponding clutch part 552 and sleeve 551 are in their initial positions. The first clutch pin 554 is engaged in the first limiting groove 5512, and the second clutch pin 555 is engaged in the second limiting groove 5513. The motor gear 72 and transmission gear 511 drive the left manual shaft 51 to rotate, thereby activating the mechanical clutch 55. The sleeve 551 rotates, driving the worm 54 to rotate. This causes the worm wheel 56, which meshes with the worm 54, to rotate. Through the worm wheel shaft 562, the half-tooth crank arm 57 and the drive crank arm 58 rotate counterclockwise around the worm wheel shaft 562. This, in turn, causes the drive crank arm 58 to push the drive plate 59 to rotate clockwise. The internal teeth 593 of the drive plate 59 engage with the external teeth 501 of the output shaft 50, causing the output shaft 50 to rotate counterclockwise and output angle and torque. Simultaneously, the half-tooth crank arm 57 drives the rack 62 towards the counter 68 (…). Figure 7 The rack 62 moves in the upward direction, causing the pull plate 63, limit switch switching block 64, fixed base 65, opening adjustment screw 661, and closing adjustment screw 662 to move synchronously. At the same time, the half-tooth crank arm 57 pulls the connecting plate 692 upward, which drives the transmission shaft of the auxiliary switch 694 to rotate counterclockwise through the auxiliary switch crank arm 693. During these movements, the drive plate 59 drives the drive shaft 60 to rotate clockwise, thereby causing the first sprocket 611 on the drive shaft 60 to rotate synchronously. This drives the second sprocket 612 to rotate synchronously through the chain 613, which in turn drives the bevel gear 614 on the second sprocket 612 to rotate synchronously, causing the bevel gear shaft 5121 to rotate clockwise. This drives the spline shaft 101 connected to the bevel gear shaft 5121 to rotate synchronously, which in turn drives the gear 104 to rotate synchronously clockwise (viewed from bottom to top), causing the rack plate 105 to move to the left, pushing the left-side indicator crank arm 352 to rotate counterclockwise, thus outputting the position status of the mechanism.

[0075] When the isolation closing movement is in place, the closing adjustment screw 662 pushes the mechanical clutch 55 upwards, causing the second clutch pin 555 to disengage from the second limit groove 5513. The limit switch switching block 64 presses against the roller of the limit switch 67 near the counter 68, and one side of the worm gear 56 presses against the closing limit screw 663. At this time, due to the disengagement of the mechanical clutch 55, the manual shaft 51 separates from the worm gear 54, the motor 7 is de-energized, the output shaft 50 stops rotating, the indicator 35 displays the isolation position, and the isolation closing auxiliary signal point is output. During this isolation closing process, if the motor 7 overshoots, the mechanical clutch 55 prevents the worm gear 54 from rotating, thus avoiding damage caused by overload. The motor 7 rotates in the opposite direction at a certain angle, causing the second clutch pin 555 to be re-engaged into the second limit groove 5513 by the reset force of the spring 544 below the clutch part 552, so that the manual shaft 51 and the worm gear 54 rotate synchronously.

[0076] II. Isolation

[0077] At this time, the left side of the mechanism 5 is activated, energizing the left-side motor 7 and another left-side relay 8 (or by inserting the manual crank to operate the manual shaft 51). The clutch 552 and sleeve 551 are in their initial positions. The first clutch pin 554 is engaged in the first limiting groove 5512, and the second clutch pin 555 is engaged in the second limiting groove 5513. The motor gear 72 and transmission gear 511 drive the left-side manual shaft 51 to rotate, which in turn drives the sleeve 551 of the mechanical clutch 55 to rotate. The cylinder 551 drives the worm 54 to rotate, which in turn rotates the worm wheel 56 meshing with the worm 54. This rotation, via the worm wheel shaft 562, drives the half-tooth crank arm 57 and the drive crank arm 58 to rotate clockwise around the worm wheel shaft 562. This, in turn, drives the drive crank arm 58 to push the drive plate 59 to rotate counterclockwise. The internal teeth 593 of the drive plate 59 engage with the external teeth 501 of the output shaft 50, causing the output shaft 50 to rotate clockwise and output angle and torque. Simultaneously, the half-tooth crank arm 57 drives the rack 62 away from the counter 68 (motor 7 side). The movement of the rack 62 causes the pull plate 63, limit switch switching block 64, fixed base 65, trip adjusting screw 661, and closing adjusting screw 662 to move synchronously; simultaneously, the half-tooth crank arm 57 pulls the connecting plate 692 downward, which drives the drive shaft of the auxiliary switch 694 to rotate clockwise through the auxiliary switch crank arm 693; during these movements, the drive plate 59 drives the drive shaft 60 to rotate counterclockwise, thereby causing the first sprocket 611 mounted on the drive shaft 60 to rotate synchronously, which is then transmitted through the chain 6... 13 drives the second sprocket 612 to rotate synchronously, thereby causing the bevel gear 614 on the second sprocket 612 to rotate synchronously, causing the bevel gear shaft 5121 to rotate counterclockwise, thereby driving the spline shaft 101 connected to the bevel gear shaft 5121 to rotate synchronously, which in turn drives the gear 104 to rotate synchronously counterclockwise (viewed from bottom to top), causing the rack plate 105 to move to the right and away from the left indicator crank arm 352. The left indicator crank arm 352 rotates clockwise under the action of the torsion spring 353, outputting the position status of the mechanism.

[0078] When the isolation tripping action is in place, the tripping adjustment screw 661 pushes down to disengage the mechanical clutch 55, causing the first clutch pin 554 to disengage from the first limit groove 5512. The limit switch switching block 64 presses against the roller of the limit switch 67 on the side away from the counter 68, and one side of the drive crank arm 58 presses against the tripping limit screw 664. At this time, due to the disengagement of the mechanical clutch 55, the manual shaft 51 separates from the worm gear 54, the motor 7 is de-energized, the output shaft 50 stops rotating, the indicator 35 displays the isolation tripping position, and the auxiliary signal point for isolation tripping is output. During this isolation tripping process, if the motor 7 overshoots, the mechanical clutch 55 prevents the worm gear 54 from rotating, thus avoiding damage caused by overload. The motor 7 rotates in the opposite direction at a certain angle, causing the first clutch pin 554 to be re-engaged into the first limit groove 5512 by the reset force of the spring 544 above the clutch part 552, so that the manual shaft 51 and the worm gear 54 rotate synchronously.

[0079] III. Grounding

[0080] At this time, the right side of the mechanism 5 is activated, and the right motor 7 and one of the relays 8 are energized (or the manual crank is inserted to operate the manual shaft 51). At this time, the clutch part 552 and the sleeve 551 are in the initial position, the first clutch pin 554 is engaged in the first limit groove 5512, and the second clutch pin 555 is engaged in the second limit groove 5513. The motor gear 72 and the transmission gear 511 drive the right manual shaft 51 to rotate, which in turn drives the sleeve of the mechanical clutch 55. When sleeve 551 rotates, it drives worm 54 to rotate, which in turn drives worm wheel 56, which meshes with worm 54, to rotate. This rotation, via worm wheel shaft 562, drives half-tooth crank arm 57 and drive crank arm 58 to rotate clockwise around worm wheel shaft 562. This, in turn, drives crank arm 58 to push drive plate 59 to rotate counterclockwise. The internal teeth 593 of drive plate 59 engage with the external teeth 501 of output shaft 50, causing output shaft 50 to rotate clockwise and output angle and torque. Simultaneously, half-tooth crank arm 57 drives rack 62 to rotate... The directional movement of counter 68 and rack 62 causes pull plate 63, limit switch switching block 64, fixed base 65, trip adjustment screw 661 and trip adjustment screw 662 to move synchronously; at the same time, half-tooth crank arm 57 pulls connecting plate 692 downward, which drives auxiliary switch 694 to rotate clockwise through auxiliary switch crank arm 693; during these movements, drive plate 59 drives drive shaft 60 to rotate counterclockwise, thereby causing first sprocket 611 on drive shaft 60 to rotate synchronously, which drives second sprocket 612 to rotate synchronously through chain 613, thereby causing bevel gear 614 on second sprocket 612 to rotate synchronously, causing bevel gear shaft 5121 to rotate counterclockwise, thereby driving spline shaft 101 connected to bevel gear shaft 5121 to rotate synchronously, which in turn drives gear 104 to rotate synchronously counterclockwise (viewed from bottom to top), causing rack plate 105 to move to the right, pushing right-side indicator crank arm 352 to rotate clockwise, outputting the position status of the mechanism.

[0081] When the grounding closing movement is in place, the closing adjustment screw 662 pushes the mechanical clutch 55 upwards, causing the second clutch pin 555 to disengage from the second limit groove 5513. The limit switch switching block 64 presses against the roller of the limit switch 67 near the counter 68, and one side of the worm gear 56 presses against the closing limit screw 663. At this time, because the mechanical clutch 55 disengages from the first clutch pin 554, the manual shaft 51 separates from the worm gear 54, the motor 7 is de-energized, the output shaft 50 stops rotating, the indicator 35 displays the grounding closed position, and the auxiliary signal point for grounding closed is output. During this grounding closing process, if the motor 7 overshoots, the mechanical clutch 55 prevents the worm gear 54 from rotating, thus avoiding damage caused by overload. The motor 7 rotates in the opposite direction at a certain angle, causing the second clutch pin 555 to be re-engaged into the second limit groove 5513 by the reset force of the spring 544 below the clutch part 552, so that the manual shaft 51 and the worm gear 54 rotate synchronously.

[0082] IV. Grounding

[0083] At this time, the right side of the mechanism 5 is activated, energizing the right-side motor 7 and another right-side relay 8 (or by inserting the manual crank to operate the manual shaft 51). The clutch 552 and sleeve 551 are in their initial positions, the first clutch pin 554 is engaged in the first limiting groove 5512, and the second clutch pin 555 is engaged in the second limiting groove 5513. The motor gear 72 and transmission gear 511 drive the right-side manual shaft 51 to rotate, which in turn drives the sleeve 551 of the mechanical clutch 55 to rotate. When the sleeve 551 moves, it drives the worm 54 to rotate, which in turn drives the worm wheel 56 meshing with the worm 54 to rotate. This rotation, via the worm wheel shaft 562, drives the half-tooth crank arm 57 and the drive crank arm 58 to rotate counterclockwise around the worm wheel shaft 562. This, in turn, drives the drive crank arm 58 to push the drive plate 59 to rotate clockwise. The internal teeth 593 of the drive plate 59 and the external teeth 501 of the output shaft 50 engage, causing the output shaft 50 to output angle and torque counterclockwise. At the same time, the half-tooth crank arm 57 drives the rack 62 to move away from the counter 68. The movement of rack 62 drives pull plate 63, limit switch switching block 64, fixed base 65, opening adjustment screw 661 and closing adjustment screw 662 to move synchronously; at the same time, half-tooth crank arm 57 also pulls connecting plate 692 upward, driving auxiliary switch 694 to rotate counterclockwise through auxiliary switch crank arm 693; during these movements, drive plate 59 drives drive shaft 60 to rotate clockwise, thereby driving first sprocket 611 on drive shaft 60 to rotate synchronously, driving second sprocket 612 to rotate synchronously through chain 613, thereby driving bevel gear 614 on second sprocket 612 to rotate synchronously, causing bevel gear shaft 5121 to rotate clockwise, thereby driving spline shaft 101 connected to bevel gear shaft 5121 to rotate synchronously, and then driving gear 104 to rotate synchronously clockwise (viewed from bottom to top), causing rack plate 105 to move to the left away from right indicator crank arm 352, right indicator crank arm 352 rotates counterclockwise under the action of torsion spring 353, outputting the position status of the mechanism.

[0084] When the grounding trip mechanism is in place, the trip adjustment screw 661 pushes down to disengage the mechanical clutch 55, causing the first clutch pin 554 to disengage from the first limit groove 5512. The limit switch switching block 64 presses against the roller of the limit switch 67 on the side away from the counter 68, and one side of the drive crank arm 58 presses against the trip limit screw 664. At this time, due to the disengagement of the mechanical clutch 55, the manual shaft 51 separates from the worm gear 54, the motor 7 is de-energized, the output shaft 50 stops rotating, the indicator 35 displays the grounding trip position, and the auxiliary signal point of the grounding trip is output. During this grounding trip process, if the motor 7 overshoots, the mechanical clutch 55 prevents the worm gear 54 from rotating, thus avoiding damage caused by overload. The motor 7 rotates in the opposite direction at a certain angle, causing the first clutch pin 554 to be re-engaged into the first limit groove 5512 by the reset force of the spring 544 above the clutch part 552, so that the manual shaft 51 and the worm gear 54 rotate synchronously.

[0085] In this invention, the direction in which the pull plate 63 moves toward the counter 68 is denoted as the first direction, and the direction away from the counter 68 is denoted as the second direction. The first direction and the second direction are opposite, and the first direction (second direction) is parallel to the axial direction of the manual shaft 51 and the worm gear 54.

[0086] The dual-motor, three-position operating mechanism of this invention has two sets of transmission devices in its mechanical structure, which ultimately converge into a single output shaft 50. Therefore, the isolation and grounding points coincide. Due to the symmetrical and integrated layout of the mechanism 5, the isolation and grounding functions are interchangeable; that is, the left side can be used as both isolation and grounding, and similarly, the right side can be used as both. The main moving parts, control parts, and output parts are integrated into the mechanism 5, while vulnerable parts and parts requiring maintenance are arranged in easily accessible locations, facilitating product testing and maintenance.

[0087] In addition to meeting the characteristics and functional requirements, two more mechanical clutches have been added, making the mechanism safer and more reliable. In particular, when using AC / DC dual-purpose motors, it can prevent the motor's inertial overshoot from impacting the mechanism and the stationary contact of the switch.

Claims

1. A miniaturized dual-motor three-position operating mechanism, comprising a mechanism housing (1), a mechanism core (5) disposed within the mechanism housing (1), and a motor (7), wherein the mechanism core (5) includes a manual shaft (51) driven by the motor (7) or manually, the mechanism core (5) further comprising a worm gear (54) coaxially distributed with the manual shaft (51) and thus capable of being driven to rotate by the manual shaft (51), a worm wheel (56) meshing with the worm gear (54), a drive crank arm (58) driven to rotate synchronously by the worm wheel (56), a drive plate (59) driven to rotate by the drive crank arm (58), and an output shaft (50) driven to rotate by the drive plate (59) to output angle and torque, characterized in that: The manual shaft (51) and the worm (54) are connected by a mechanical clutch (55). The mechanism (5) also includes a pull plate (63) driven by a worm wheel (56) that can make linear reciprocating motion in a first direction and a reverse second direction. The axial direction of the worm (54) is parallel to the first direction. The pull plate (63) is provided with a disengagement adjustment screw (611) that can disengage the mechanical clutch (55) and the manual shaft (51) by applying force to the mechanical clutch (55), and a closing adjustment screw (612) that can disengage the mechanical clutch (55) and the worm (54) by applying force to the mechanical clutch (55). The dual-motor three-position operating mechanism also includes a cover (2) that covers the front side of the mechanism box (1). The mechanism (5) also includes a rear plate (53) that is fixedly connected to the mechanism box (1) and a front plate (52) that is spaced apart in front of the rear plate (53). The worm gear (56) is rotatably disposed between the front plate (52) and the rear plate (53). The drive crank arm (58) and the drive plate (59) are located behind the rear plate (53). The pull plate (63) is slidably disposed in front of the front plate (52).

2. The miniaturized dual-motor three-position operating mechanism according to claim 1, characterized in that: The mechanical clutch (55) includes a sleeve (551), a clutch part (552) that moves linearly synchronously with the sleeve (551) and can rotate relative to it, a first clutch pin (554) disposed at the end of the manual shaft (51), and a second clutch pin (555) disposed at the end of the worm (54). The ends of the manual shaft (51) and the worm (54) with their respective clutch pins extend into the sleeve (551). The sleeve (551) has a first limiting groove (5512) extending axially from one end near the manual shaft (51) to the direction away from the manual shaft (51), and a second limiting groove (5513) extending axially from one end near the worm (54) to the direction away from the worm (54). The first clutch pin (554) can be engaged in the first limiting groove. Within 5512), the manual shaft (51) and sleeve (551) rotate synchronously, and the second clutch pin (555) can be engaged in the second limiting groove (5513) to make the worm (54) and sleeve (551) rotate synchronously. When the pull plate (63) moves in the first direction, the closing adjustment screw (612) applies force to the clutch part (552) to make the second clutch pin (555) and the second limiting groove (5513) disengage, thereby disengaging the mechanical clutch (55) and the worm (54). When the pull plate (63) moves in the second direction, the opening adjustment screw (611) applies force to the clutch part (552) to make the first clutch pin (554) and the first limiting groove (5512) disengage, thereby disengaging the mechanical clutch (55) and the manual shaft (51).

3. The miniaturized dual-motor three-position operating mechanism according to claim 2, characterized in that: The outer periphery of the sleeve (551) has a radially inwardly recessed annular groove (5511). The clutch part (552) is engaged in the annular groove (5511) to achieve synchronous linear movement with the sleeve (551) and can rotate relative to the sleeve (551). The pull plate (63) has an installation groove (633). The opening adjustment screw (611) and the closing adjustment screw (612) are respectively threaded to both ends of the installation groove (633) along the movement direction of the pull plate (63). The clutch part (552) has a push plate (5522) extending into the installation groove (633) for interacting with the opening adjustment screw (611) and the closing adjustment screw (612).

4. The miniaturized dual-motor three-position operating mechanism according to claim 3, characterized in that: The mechanism (5) also includes two first bearing seats (541) fixed inside the mechanism box (1). The mechanical clutch (55) is disposed between the two first bearing seats (541). Two connecting rods (543) are connected between the two first bearing seats (541). Through holes (5521) are provided on both sides of the clutch part (552) and at the positions corresponding to the connecting rods (543). Each connecting rod (543) passes through the through hole (5521) and its two ends are connected to the corresponding first bearing seat (541). Each connecting rod (543) is provided with a spring (544) on both sides of the clutch part (552) that can push the clutch part (552) to reset.

5. The miniaturized dual-motor three-position operating mechanism according to claim 3, characterized in that: The mechanism (5) also includes a limit switch switching block (64) disposed on the pull plate (63). The limit switch switching block (64) has two corresponding to closing and opening, and is arranged at intervals along the first direction. In the mechanism box (1), a limit switch (67) is disposed at the position corresponding to each limit switch switching block (64).

6. The miniaturized dual-motor three-position operating mechanism according to any one of claims 1 to 5, characterized in that: The mechanism (5) also includes a half-tooth crank arm (57) that is coaxial with and rotates synchronously with the worm gear (56), and a rack (62) that meshes with the half-tooth crank arm (57). The rack (62) and the pull plate (63) are connected and fixed, so that the rotation of the worm gear (56) can drive the pull plate (63) to move linearly.

7. The miniaturized dual-motor three-position operating mechanism according to any one of claims 1 to 5, characterized in that: The mechanism (5) also includes a closing limit screw (663) that can cooperate with the worm gear (56) to limit the rotation position of the worm gear (56), and a closing limit screw (664) that cooperates with the drive crank arm (58) to limit the rotation position of the drive crank arm (58). The worm gear (56) is fan-shaped. The closing limit screw (663) is located between the front plate (52) and the rear plate (53) and adjacent to the worm gear (56). The closing limit screw (664) is located on the rear side of the rear plate (53) and adjacent to the drive crank arm (58).

8. The miniaturized dual-motor three-position operating mechanism according to any one of claims 1 to 5, characterized in that: The combination consisting of the motor (7), manual shaft (51), worm gear (54), mechanical clutch (55), worm wheel (56), drive crank arm (58) and pull plate (63) has two sets arranged symmetrically, corresponding to isolation and grounding operations respectively.

9. The miniaturized dual-motor three-position operating mechanism according to claim 8, characterized in that: The mechanism housing (1) is welded with mounting lugs (31) for mounting the operating mechanism onto the switch.

Images