Servo motor driven high voltage fast grounding switch operating mechanism

Abstract

The utility model discloses a kind of high-voltage fast grounding switch operating mechanisms of servo motor drive, including bottom plate, servo motor and rack are fixedly installed on the bottom plate, the body input shaft is rotatably supported on rack;The output shaft of the servo motor is connected with crank, and is driven to rotate by output shaft crank;The crank is connected with connecting rod, and the other end of the connecting rod is connected rocker;The rocker is connected to the body input shaft by linkage component, and drives the body input shaft;Wherein, the length of the crank and the width of the rack sum is less than the length of the rocker and the length of the connecting rod sum.The high-voltage fast grounding switch operating mechanism provided by the utility model realizes fast, accurate action by using servo motor directly driving optimized design crank rocker mechanism, and realizes self-locking using mechanism dead point in closing position, ensure that closing state is stable and reliable.

Description

Technical Field

[0001] This utility model relates to the field of high-voltage electrical switchgear technology, and in particular to a servo motor driven high-voltage fast grounding switch operating mechanism. Background Technology

[0002] High-voltage grounding switches are critical safety devices in power systems, primarily used to reliably connect high-voltage equipment to the earth during equipment maintenance or fault handling, forming a clear grounding connection point and ensuring the personal safety of maintenance personnel. The operating mechanism, as the core driving component of the high-voltage grounding switch, directly determines the reliability, response speed, and operational stability of the grounding switch.

[0003] In existing technologies, high-voltage grounding switch operating mechanisms commonly employ hydraulic mechanisms, spring mechanisms, or traditional electric motor drive mechanisms. While hydraulic mechanisms can provide significant output torque, they pose environmental risks due to hydraulic oil leakage and reliability degradation caused by seal aging. Spring mechanisms require pre-stored energy, resulting in complex structures and high maintenance costs during energy storage. Traditional electric motor drive mechanisms offer convenient control, but achieving sufficient output torque and operational accuracy typically requires multi-stage reduction or conversion mechanisms, leading to a cumbersome overall structure, increased potential failure points, and susceptibility to transmission backlash, thus limiting reliability under extreme positions or external impacts.

[0004] Servo motor drive solutions have gradually gained attention in the high-voltage electrical field due to their significant advantages in control precision and response speed. However, directly applying servo motors to the operating mechanism of high-voltage fast grounding switches faces several core technical challenges: First, how to optimize the transmission path to simplify the structure while ensuring the effective transmission of instantaneous high torque; second, how to achieve rapid response of the grounding switch's opening and closing actions based on the characteristics of the servo motor; third, how to ensure the stability and reliability of the closing position and avoid displacement of the moving contact caused by external disturbances; fourth, conventional crank-connecting rod mechanisms have dead points at specific positions, which, if poorly designed, can easily lead to mechanism jamming or incomplete action, further limiting the practical application of servo motor drive solutions; fifth, existing servo motor drive technologies also suffer from drawbacks such as high noise and poor controllability, making it difficult to meet the requirements of modern power systems for low-noise and high-precision control of equipment.

[0005] Therefore, developing a servo motor-driven operating mechanism that combines simple structure, fast action, reliable self-locking, and precise control has become a key direction for upgrading high-voltage grounding switch technology. Utility Model Content

[0006] In view of the above-mentioned shortcomings of the current high-voltage grounding switch operating mechanism, this utility model provides a servo motor driven high-voltage fast grounding switch operating mechanism. This mechanism adopts a servo motor to directly drive an optimized crank-rocker four-bar linkage mechanism and utilizes the dead point characteristics of the mechanism in the closing position to realize the rapid opening and closing operation of the grounding switch and reliable mechanical self-locking at the closing end point, which significantly improves the reliability of operation and the ability to resist the electrodynamic impact of short-circuit current.

[0007] To achieve the above objectives, the embodiments of this utility model adopt the following technical solutions:

[0008] A servo motor driven high-voltage fast grounding switch operating mechanism realizes the opening and closing operation by driving the input shaft of the high-voltage grounding switch body, including a base plate;

[0009] A servo motor and a frame are fixedly mounted on the base plate, and the main body input shaft is rotatably supported on the frame;

[0010] The output shaft of the servo motor is connected to a crank, and the output shaft drives the crank to rotate.

[0011] The crank is connected to a connecting rod, and the other end of the connecting rod is connected to a rocker arm;

[0012] The joystick is connected to the input shaft of the main body via a linkage component and drives the input shaft of the main body to rotate;

[0013] Wherein, the sum of the length of the crank and the width of the frame is less than the sum of the length of the rocker arm and the length of the connecting rod.

[0014] According to one aspect of the present invention, the crank is provided with limit rods at both extreme positions of its rotational motion.

[0015] According to one aspect of this utility model, the output shaft of the servo motor is directly or through a primary reduction mechanism to drive the crank to rotate.

[0016] According to one aspect of this utility model, the primary reduction mechanism is a single-stage gear reducer or a synchronous belt drive device, used to reduce the speed and increase the torque of the servo motor output.

[0017] According to one aspect of the present invention, the two ends of the connecting rod are movably connected to the crank and rocker arm by means of pins or hinges.

[0018] According to one aspect of this utility model, the crank, connecting rod, rocker arm, and frame are single-degree-of-freedom planar mechanisms.

[0019] According to one aspect of the present invention, the servo motor driven high-voltage fast grounding switch operating mechanism further includes a position indicator, which is disposed at one end of a shaft segment that rotates synchronously with the input shaft of the main body. When the rocker arm rotates to the angle corresponding to the open or closed position of the high-voltage fast grounding switch, the position indicator is triggered to indicate the status.

[0020] According to one aspect of the present invention, the servo motor-driven high-voltage fast grounding switch operating mechanism further includes an auxiliary switch. The auxiliary switch is disposed on a shaft segment that rotates synchronously with the input shaft of the main body. When the rocker arm rotates to the angle corresponding to the open or closed position of the high-voltage fast grounding switch, the auxiliary switch is driven to switch contacts and output a corresponding electrical signal, thereby feeding back the open / closed state of the grounding switch to the control system in the form of electrical contacts.

[0021] According to one aspect of the present invention, there are two frames, and the rocker arm is disposed on a shaft section between the two frames.

[0022] According to one aspect of the present invention, the servo motor and the frame are both fixed to the base plate by screws, and the frame is provided with reinforcing ribs.

[0023] The advantages of this utility model are as follows: First, it adopts a highly integrated crank-rocker four-bar linkage mechanism, eliminating the need for complex multi-stage reduction or motion conversion devices. This results in fewer parts, a shorter transmission chain, significantly reduced failure rate, and improved overall operational reliability and long-term stability. Second, it fully leverages the superior control performance of the servo motor, enabling precise position and speed control of the operating mechanism with rapid response. Third, the unique design allows the motor to output power directly and efficiently without deceleration during operation, transmitted through the optimized four-bar linkage mechanism, achieving rapid opening and closing of the grounding switch. Fourth, it utilizes the dead-point characteristic of the four-bar linkage mechanism to achieve mechanical self-locking at the closing endpoint, eliminating the need for additional locking devices. This simple structure effectively resists external disturbances such as short-circuit electrodynamics, ensuring the moving contact remains stably closed even in extreme conditions, resulting in outstanding safety performance. Fifth, the position indicator and auxiliary switch signals are directly acquired from the rocker shaft, resulting in a simple structure and accurate and timely feedback. Sixth, it is purely electric-driven, eliminating the risk of hydraulic oil leakage and pollution, thus meeting environmental protection requirements. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a front view of a servo motor driven high-voltage fast grounding switch operating mechanism according to the present invention.

[0026] Figure 2 This is an isometric view of a servo motor driven high-voltage fast grounding switch operating mechanism according to the present invention.

[0027] The components are: 1. Servo motor, 2. Crank, 3. Connecting rod, 4. Rocker arm, 5. Frame, 6. Main body input shaft, 7. Position indicator, 8. Auxiliary switch, 9. Limit rod, 10. Base plate, 11. Moving contact, 12. Reinforcing rib. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0029] Figure 1 and Figure 2 This diagram illustrates the structure of a servo motor-driven high-voltage fast grounding switch operating mechanism according to this invention. This mechanism achieves opening and closing operations by driving the input shaft 6 of the high-voltage grounding switch body. Figure 1 and Figure 2 As shown, the mechanism includes a base plate 10, on which a servo motor 1 and a frame 5 are fixedly mounted. The main body input shaft 6 is rotatably supported on the frame 5. The output shaft of the servo motor 1 is connected to a crank 2, which drives the crank 2 to rotate. The crank 2 is connected to a connecting rod 3, and the other end of the connecting rod 3 is connected to a rocker arm 4. The rocker arm 4 is connected to the main body input shaft 6 through a linkage component, which drives the main body input shaft 6 to rotate. The sum of the length of the crank 2 and the width of the frame 5 is less than the sum of the length of the rocker arm 4 and the length of the connecting rod 3.

[0030] In this embodiment of the invention, the servo motor 1 is a high-torque, high-speed servo motor. During the movement of the mechanism from the open position to the closed position or from the closed position to the open position, the servo motor 1 outputs its inherent high speed and high torque, without the need to execute a deceleration control program. In this way, the power generated by the servo motor 1 is efficiently converted into the rotational motion of the main body input shaft 6 through the crank 2-connecting rod 3-rocker 4 mechanism, thereby driving the moving contact 11 to complete the opening and closing operation.

[0031] The specific process of the mechanism in this design, from the drive of servo motor 1 to the completion of closing and opening, is as follows: When the closing command is received, servo motor 1 starts at full speed and outputs maximum torque. Its output shaft directly drives crank 2 to rotate. Crank 2 transmits the motion to rocker arm 4 through connecting rod 3, causing rocker arm 4 to swing around its fixed fulcrum. Since crank 2, connecting rod 3, rocker arm 4 and the frame form a four-bar linkage mechanism that satisfies the condition that the sum of the length of crank 2 and the width of frame 5 is less than the sum of the length of rocker arm 4 and the length of connecting rod 3, the crank, as the driving element, can rotate continuously for a full revolution, ensuring that the transmission process has no dead spots and the operation is smooth. The swing of rocker arm 4 directly drives the high voltage through the linkage components. The grounding switch's main input shaft 6 rotates, thereby driving the moving contact 11 to move upward quickly, achieving reliable closure with the stationary contact. When the closing end position is reached, the connecting rod 3 and the rocker arm 4 tend to be collinear, and the mechanism enters the dead point state when the rocker arm 4 is the driving member, forming a mechanical self-locking mechanism. This effectively resists the electrodynamic impact generated by the short-circuit current and prevents the contacts from accidentally opening. During the opening operation, the servo motor 1 starts at full speed in reverse, using its high starting torque to drive the crank 2 in reverse, overcoming the static resistance at the dead point position, causing the mechanism to disengage from the self-locking state. The rocker arm 4 swings in reverse, driving the main input shaft 6 and the moving contact 11 to move downward, completing the rapid opening action.

[0032] It should be noted that crank 2, connecting rod 3, rocker arm 4, and the fixedly mounted frame 5 together constitute a single-degree-of-freedom planar four-bar linkage. In a four-bar linkage, the dead point refers to the position where the mechanism is stuck when rocker arm 4 is the driving member. At this time, no matter how much force is applied to the rocker arm, it cannot drive crank 2 to rotate because the force, after passing through connecting rod 3, passes through the center of rotation of the crank, resulting in zero torque.

[0033] In this context, "degree of freedom" refers to the number of parameters that allow for independent motion of a mechanism. The mechanism in this application requires only one independent parameter—the rotation angle of crank 2—to completely determine the position of all components. When the servo motor drives the crank to rotate at a certain angle, the posture of connecting rod 3 and the swing angle of rocker arm 4 are uniquely determined, with no other freely variable directions of motion; hence, it is called a single degree of freedom. This characteristic ensures the determinism and controllability of the mechanism's motion, meeting the requirements for precise control of servo motors. Simultaneously, the motion trajectories of all components of the four-bar linkage (crank 2, connecting rod 3, rocker arm 4, and frame 5) are within the same plane, without complex three-dimensional spatial motion. This design simplifies structural processing and assembly, reduces the risk of motion interference, ensures efficient and direct power transmission, and is suitable for the compact installation space requirements of high-voltage grounding switches.

[0034] In this embodiment of the invention, the output shaft of the servo motor 1 is directly or via a primary reduction mechanism connected to the crank 2, thereby driving the crank 2 to rotate. The primary reduction mechanism can be a single-stage gear reducer or a synchronous belt drive to slightly reduce the speed and increase the torque of the servo motor 1's output. The configuration of the single-stage gear reducer or synchronous belt drive is prior art and is not specifically limited in this invention.

[0035] It is understandable that the two ends of the connecting rod 3 are connected to the crank 2 and the rocker arm 4 by pins or hinges, which can ensure the stability of the connection without affecting the rotation of the crank 2 and the swing of the rocker arm 4.

[0036] In this embodiment of the utility model, the high-voltage fast grounding switch operating mechanism driven by the servo motor also includes a position indicator 7. The position indicator 7 is located at one end of the shaft segment that rotates synchronously with the input shaft 6 of the main body. When the rocker arm 4 rotates to a specific angle corresponding to the open or closed position of the high-voltage fast grounding switch, the position indicator 7 is triggered to indicate the status.

[0037] Common position indicators 7 include mechanical pointer type and electrical display type. The mechanical pointer type uses a mechanical structure connected to the rocker shaft to rotate the pointer, with different areas representing different open / closed states. The electrical display type uses a sensor to detect the angular position of the input shaft 6, converting the angle signal into an electrical signal, and displaying it via LEDs or other means. The specific type of position indicator 7 can be reasonably selected according to needs, and this utility model does not impose any special limitations.

[0038] Meanwhile, the structural design of the position indicator 7 must meet the environmental requirements of high-voltage electrical equipment and possess good protective performance, such as dustproof, moisture-proof, and corrosion-proof. Furthermore, to ensure the accuracy and reliability of the indication, its internal mechanical structure or sensor should have high precision and stability, and be securely installed so that the indication effect is not affected by factors such as vibration of the mechanism.

[0039] In this embodiment of the present invention, the high-voltage fast grounding switch operating mechanism driven by the servo motor also includes an auxiliary switch 8. The auxiliary switch 8 is set on a shaft segment that rotates synchronously with the input shaft 6 of the main body. When the rocker arm 4 rotates to a specific angle corresponding to the open or closed position of the high-voltage fast grounding switch, the auxiliary switch 8 is driven to switch contacts and output a corresponding electrical signal, thereby feeding back the open and closed status of the grounding switch to the control system in the form of electrical contacts.

[0040] The auxiliary switch 8 is mainly used to feed back the opening and closing status of the high-voltage grounding switch to the control system in the form of electrical contacts. When the high-voltage grounding switch is open or closed, the auxiliary switch 8 switches its contact status along with the rotation of the input shaft 6, transmitting the actual status information of the high-voltage grounding switch to the control circuit, protection devices, monitoring systems, etc. For example, in a substation automation system, the signal fed back by the auxiliary switch allows the background monitoring system to display the status of the grounding switch in real time, facilitating remote monitoring and operation.

[0041] Meanwhile, the auxiliary switch 8 needs to have good electrical performance, such as a high withstand voltage rating and reliable contact performance, to ensure stable and accurate signal transmission under high-voltage conditions. In addition, its mechanical structure should have a certain degree of vibration and shock resistance to ensure the reliability of contact switching during the operation of the operating mechanism and avoid contact malfunction or poor contact due to vibration or other factors.

[0042] In this embodiment of the invention, the crank 2 is provided with limit rods 9 at both extreme positions of its rotational motion to limit the rotation range of the crank 2.

[0043] The limit rod 9 limits the rotation angle range of the crank 2, on the one hand, to prevent excessive rotation that could cause the connecting rod 3, rocker arm 4 and other components to be subjected to excessive force or interfere with other structures, thus avoiding mechanical damage and ensuring the safe operation of the mechanism; on the other hand, it can help the crank 2 to accurately stop at the corresponding motion limit positions of opening and closing, and in conjunction with the dead point characteristics of the mechanism, ensure the accuracy and stability of the opening and closing positions, while providing a reliable mechanical positioning basis for the precise triggering of the position indicator 7 and auxiliary switch 8 for status indication and signal switching.

[0044] To ensure the stability of the input shaft 6, in this embodiment of the invention, there are two frames 5, and the rocker arm 4 is mounted on the shaft section between the two frames 5. Meanwhile, both the servo motor 1 and the frames 5 are fixed to the base plate 10 with screws, and the frames 5 are equipped with reinforcing ribs 12.

[0045] The advantages of this utility model are as follows: First, it adopts a highly integrated crank-rocker four-bar linkage mechanism, eliminating the need for complex multi-stage reduction or motion conversion devices. This results in fewer parts, a shorter transmission chain, significantly reduced failure rate, and improved overall operational reliability and long-term stability. Second, it fully leverages the superior control performance of the servo motor, enabling precise position and speed control of the operating mechanism with rapid response. Third, the unique design allows the motor to output power directly and efficiently without deceleration during operation, transmitted through the optimized four-bar linkage mechanism, achieving rapid opening and closing of the grounding switch. Fourth, it utilizes the dead-point characteristic of the four-bar linkage mechanism to achieve mechanical self-locking at the closing endpoint, eliminating the need for additional locking devices. This simple structure effectively resists external disturbances such as short-circuit electrodynamics, ensuring the moving contact remains stably closed even in extreme conditions, resulting in outstanding safety performance. Fifth, the position indicator and auxiliary switch signals are directly acquired from the rocker shaft, resulting in a simple structure and accurate and timely feedback. Sixth, it is purely electric-driven, eliminating the risk of hydraulic oil leakage and pollution, thus meeting environmental protection requirements.

[0046] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A servo motor-driven high-voltage fast grounding switch operating mechanism, which realizes the opening and closing operation by driving the input shaft (6) of the high-voltage grounding switch body, includes a base plate (10), characterized in that: A servo motor (1) and a frame (5) are fixedly installed on the base plate (10), and the main body input shaft (6) is rotatably supported on the frame (5); The output shaft of the servo motor (1) is connected to a crank (2), and the crank (2) is driven to rotate through the output shaft; The crank (2) is connected to a connecting rod (3), and the other end of the connecting rod (3) is connected to a rocker arm (4); The rocker arm (4) is connected to the input shaft (6) of the main body through a linkage component, and drives the input shaft (6) of the main body to rotate; The sum of the length of the crank (2) and the width of the frame (5) is less than the sum of the length of the rocker arm (4) and the length of the connecting rod (3).

2. The servo motor-driven high-voltage fast grounding switch operating mechanism according to claim 1, characterized in that, The crank (2) is provided with limit rods (9) at both extreme positions of its rotational motion.

3. The servo motor-driven high-voltage fast grounding switch operating mechanism according to claim 1, characterized in that, The output shaft of the servo motor (1) is directly or through a primary reduction mechanism connected to drive the crank (2) to rotate.

4. The servo motor-driven high-voltage fast grounding switch operating mechanism according to claim 3, characterized in that, The primary reduction mechanism is a single-stage gear reducer or a synchronous belt drive device, used to reduce the speed and increase the torque of the output of the servo motor (1).

5. The servo motor-driven high-voltage fast grounding switch operating mechanism according to claim 1, characterized in that, The two ends of the connecting rod (3) are movably connected to the crank (2) and rocker (4) by pins or hinges.

6. The servo motor-driven high-voltage fast grounding switch operating mechanism according to claim 1, characterized in that, The crank (2), connecting rod (3), rocker arm (4) and frame (5) are single-degree-of-freedom planar mechanisms.

7. The servo motor-driven high-voltage fast grounding switch operating mechanism according to claim 1, characterized in that, The high-voltage fast grounding switch operating mechanism driven by the servo motor also includes a position indicator (7). The position indicator (7) is located at one end of the shaft segment that rotates synchronously with the input shaft (6) of the main body. When the rocker arm (4) rotates to the angle corresponding to the open or closed position of the high-voltage fast grounding switch, the position indicator (7) is triggered to indicate the status.

8. The servo motor-driven high-voltage fast grounding switch operating mechanism according to claim 1, characterized in that, The high-voltage fast grounding switch operating mechanism driven by the servo motor also includes an auxiliary switch (8). The auxiliary switch (8) is set on a shaft segment that rotates synchronously with the input shaft (6) of the main body. When the rocker arm (4) rotates to the angle corresponding to the open or closed position of the high-voltage fast grounding switch, it drives the auxiliary switch (8) to switch contacts and outputs a corresponding electrical signal, thereby feeding back the open / closed status of the grounding switch to the control system in the form of electrical contacts.

9. The servo motor-driven high-voltage fast grounding switch operating mechanism according to claim 1, characterized in that, There are two frames (5), and the rocker arm (4) is set on the shaft section between the two frames (5).

10. The servo motor-driven high-voltage fast grounding switch operating mechanism according to any one of claims 1-9, characterized in that, The servo motor (1) and the frame (5) are both fixed to the base plate (10) by screws, and the frame (5) is provided with reinforcing ribs (12).

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