Single-motor driving anti-stuck three-station belt driving device and control method thereof

Abstract

The present application relates to the technical field of high-voltage switch, and discloses a single-motor driving anti-stuck three-station driving device and a control method thereof, aiming at solving the problems of easy sticking and burning of motor and high cost of double-motor driving when the existing three-station mechanism adopts ball screw transmission. The device is symmetrically arranged as a whole, and transmission units for opening and closing of disconnectors and grounding switches are arranged respectively, and the middle part is connected with a single motor through an axially slidable electromagnetic clutch. Each transmission unit comprises a coil shaft, a driving wheel, a ratchet wheel and a reverse ratchet wheel with opposite transmission directions, a push rod, a pull rod, a driving slider and a guide rail, etc. The control method makes the electromagnetic clutch engage the transmission unit on the corresponding side by electrifying the coil shaft, and drives the push rod and the pull rod to drive the driving slider to complete the opening and closing action by using the single-direction transmission characteristics of the positive and negative ratchet wheels.

Description

Technical Field

[0001] This invention relates to the field of high-voltage switch technology, specifically to a three-position mechanism for driving isolation and grounding bodies and its control method. Background Technology

[0002] As the voltage level of power transmission and transformation in China continues to increase, higher requirements are placed on the compactness of power transmission and transformation equipment. When isolation and grounding are located in the same combined electrical appliance, mechanical or electrical interlocking is required.

[0003] Mechanical interlocks achieve mutual restriction of isolation and grounding through physical limitations. Combined electrical equipment using mechanical interlocks is independent of power supply and will not fail due to control circuit faults, thus possessing higher reliability. Currently, most domestic and international three-position isolation and grounding operating mechanisms use ball screw transmission combined with motor drive. Under load, jamming is prone to occur during start-up and shutdown. Upon restarting, this can cause excessive motor load and burnout, leading to the inability to perform electrical operation of isolation and grounding, resulting in a major safety accident. Summary of the Invention

[0004] To address the problem of motor burnout caused by overshoot during the start-stop of three-position switching devices, this invention proposes a single-motor driven anti-jamming three-position drive device and its control method, which can effectively prevent jamming at the opening and closing positions. Furthermore, the use of an electromagnetic clutch and a single-motor drive effectively reduces the overall cost of the mechanism.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a single-motor driven anti-jamming three-position drive device, comprising a single motor, an electromagnetic clutch, and symmetrically arranged isolation side transmission unit and grounding side transmission unit. The isolation side transmission unit and the grounding side transmission unit are respectively used to drive the opening and closing of the isolation switch and the grounding switch. The electromagnetic clutch is drivenly connected to the output shaft of the single motor, and the electromagnetic clutch can slide along the axial direction, selectively engaging with the isolation side transmission unit or the grounding side transmission unit.

[0006] The isolation-side transmission unit and the grounding-side transmission unit have the same structure, both including a coil shaft, a drive wheel, a drive support, a ratchet, a reverse ratchet, a push rod, a pull rod, a support, a drive slider, a guide rail, and a guide rail support. One end of the coil shaft can engage with the electromagnetic clutch for transmission. Two drive wheels are mounted on the same coil shaft. One drive wheel is connected to the coil shaft via the ratchet, and the other drive wheel is connected to the coil shaft via the reverse ratchet. The unidirectional transmission directions of the ratchet and the reverse ratchet are opposite.

[0007] The two drive rollers respectively cooperate with the push rod and the pull rod, both of which are supported by the support. The ends of the push rod and the pull rod are connected to the drive slider. The guide rail is fixedly installed by the guide rail support, and the drive slider is slidably installed on the guide rail. The drive slider is used to connect with the self-locking component of the switch body, driving the switch body to complete the opening and closing action.

[0008] Furthermore, both ends of the electromagnetic clutch are provided with splines, and the end of the coil shaft facing the electromagnetic clutch is provided with a keyway adapted to the splines. When the electromagnetic clutch slides axially, the spline at one end engages with the keyway of the corresponding side of the coil shaft, and the spline at the other end disengages from the keyway of the other side of the coil shaft.

[0009] Furthermore, the drive wheel is provided with a protruding portion, the end of the push rod is provided with a pushing surface adapted to the protruding portion of the drive wheel, and the pull rod is provided with a recessed portion adapted to the protruding portion of the drive wheel.

[0010] Furthermore, the drive support is used to provide rotational support for the two drive wheels.

[0011] A control method for the above-mentioned single-motor driven anti-jamming three-position drive device includes a grounding switch opening and closing control step and an isolating switch opening and closing control step.

[0012] The specific steps for controlling the opening and closing of the grounding switch are as follows: S11: When the grounding side coil shaft is energized, the electromagnetic clutch slides axially to the grounding side under the action of electromagnetic force. The electromagnetic clutch engages with the spline and keyway of the grounding side coil shaft and disengages from the isolation side coil shaft. S12: When the grounding switch is closed, the single motor rotates in the forward direction, driving the electromagnetic clutch and the grounding side coil shaft to rotate synchronously. At this time, the ratchet drive and the reverse ratchet on the grounding side rotate freely. The drive wheel connected to the ratchet rotates with the coil shaft. Its protruding part pushes the push rod to make linear motion. The push rod then pushes the drive slider to slide along the guide rail. The drive slider drives the self-locking parts of the switch body to complete the grounding switch closing action. S13: When the grounding switch is opened, the single motor rotates in reverse, driving the electromagnetic clutch and the grounding side coil shaft to rotate in reverse synchronously. At this time, the reverse ratchet drive on the grounding side and the ratchet rotates freely. The drive wheel connected to the reverse ratchet rotates with the coil shaft. Its protruding part enters the recessed part of the pull rod, driving the pull rod to make a linear motion. The pull rod then pulls the drive slider to slide in the reverse direction along the guide rail. The drive slider drives the self-locking parts of the switch body to complete the grounding switch opening action.

[0013] The opening and closing control steps of the disconnecting switch are in the same principle as the opening and closing control steps of the grounding switch, specifically as follows: S21: When the isolation side coil shaft is energized, the electromagnetic clutch slides axially to the isolation side under the action of electromagnetic force. The electromagnetic clutch engages with the spline and keyway of the isolation side coil shaft and disengages from the grounding side coil shaft. S22: When the disconnecting switch is closed, the single motor rotates in the forward direction, driving the electromagnetic clutch and the isolation side coil shaft to rotate synchronously. At this time, the ratchet drive on the isolation side and the reverse ratchet rotate freely. The drive wheel connected to the ratchet rotates with the coil shaft. Its protruding part pushes the push rod to make linear motion. The push rod then pushes the drive slider to slide along the guide rail. The drive slider drives the self-locking parts of the switch body to complete the disconnecting switch closing action. S23: When the disconnecting switch is opened, the single motor rotates in reverse, driving the electromagnetic clutch and the isolation side coil shaft to rotate in reverse synchronously. At this time, the reverse ratchet drive on the isolation side and the ratchet rotates freely. The drive wheel connected to the reverse ratchet rotates with the coil shaft. Its protruding part enters the recessed part of the pull rod, driving the pull rod to make a linear motion. The pull rod then pulls the drive slider to slide in the reverse direction along the guide rail. The drive slider drives the self-locking parts of the switch body to complete the disconnecting switch opening action.

[0014] One or more technical solutions provided in this application embodiment have at least the following technical effects or advantages compared with the prior art: 1. A single motor combined with an electromagnetic clutch is used to achieve independent drive for the isolation and grounding positions, eliminating the need for dual motors, effectively reducing the overall cost of the mechanism. At the same time, the compact structure meets the design requirements of compact power transmission and transformation equipment. 2. By setting ratchet and reverse ratchet with opposite transmission directions on the same coil shaft, the push rod and pull rod are driven respectively to realize the opening and closing action, avoiding the jamming problem caused by overshoot during start and stop of traditional ball screw drive, preventing the motor from burning out due to excessive load, and significantly improving the operational reliability of the three-station mechanism. 3. The equipment adopts an interlocking method that combines mechanical transmission with electromagnetic clutch, and the physical restriction isolation and grounding switch operate simultaneously, without relying on power supply and control circuit, further improving the safety performance of the equipment.

[0015] Other advantages, objectives and features of the invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination or study, or may be learned from the practice of the invention. Attached Figure Description

[0016] Figure 1 This is a front view of the single-motor drive anti-jamming three-station drive device of the present invention; Figure 2 This is a structural schematic diagram of one side of the pull rod of the present invention; Figure 3 This is a schematic diagram of the structure of the other side of the pull rod of the present invention.

[0017] As shown in the figure: 1. Guide rail support; 2. Guide rail; 3. Drive slider; 4. Support; 5. Push rod; 6. Pull rod; 7. Coil shaft; 8. Electromagnetic clutch; 9. Drive wheel; 10. Drive support; 11. Ratchet; 12. Reverse ratchet. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] It should be noted that the terms "vertical," "horizontal," "up," "down," "left," "right," and similar expressions used in this article are for illustrative purposes only and do not represent the only possible implementation.

[0020] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains; the terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to limit the invention; the term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0021] like Figures 1-3 As shown, this invention discloses a single-motor driven anti-jamming three-position drive device. The overall mechanism adopts a symmetrical arrangement, with one side used for opening and closing the isolating switch and the other side used for opening and closing the grounding switch. The specific arrangement can be adjusted according to the actual situation of the combined electrical appliance body. This embodiment takes the right side as the grounding side and the left side as the isolating side as an example for detailed description.

[0022] This device consists of a single motor, an electromagnetic clutch 8, a coil shaft 7, a drive wheel 9, a drive support 10, a ratchet 11, a reverse ratchet 12, a pull rod 6, a push rod 5, a support 4, a drive slider 3, a guide rail 2, and a guide rail support 1. The structures on both sides are symmetrically arranged for isolation transmission and grounding transmission, respectively, and the transmission is connected in the middle by the electromagnetic clutch 8.

[0023] The electromagnetic clutch 8 is driven to rotate by a single motor. Both ends of the clutch are equipped with splines, and the ends of the coil shafts 7 on both sides facing the electromagnetic clutch 8 are equipped with keyways that are compatible with the splines. When it is necessary to drive an isolating or grounding switch, the corresponding coil shaft 7 is energized, and the electromagnetic clutch 8 moves axially to that side under the action of electromagnetic force. The splines and keyways of the electromagnetic clutch 8 and the coil shaft 7 on that side engage to achieve torque transmission. At the same time, the electromagnetic clutch 8 disengages from the splines and keyways of the coil shaft 7 on the other side, and the transmission unit on the other side does not participate in the operation, thus achieving mechanical interlocking.

[0024] The transmission unit structures on the isolation side and the grounding side are identical. Two drive wheels 9 are configured on the same coil shaft 7. Each drive wheel 9 is connected to the coil shaft 7 via a ratchet, and the two ratchets have opposite unidirectional transmission directions, namely ratchet 11 and reverse ratchet 12. The drive support 10 is used to provide rotational support for the two drive wheels 9 to ensure their rotational stability.

[0025] Both push rod 5 and pull rod 6 are supported by support 4. Guide rail 2 is fixedly installed by guide rail support 1. Drive slider 3 is slidably installed on guide rail 2. The ends of push rod 5 and pull rod 6 are connected to drive slider 3. Drive slider 3 is used to connect with the self-locking components of switch body.

[0026] The opening and closing procedures of the grounding switch and the disconnecting switch are explained below: When the grounding switch needs to be closed, the grounding side coil shaft 7 is first energized. The electromagnetic clutch 8 slides to the right under the action of electromagnetic force, engaging with the spline and keyway of the grounding side coil shaft 7 and disengaging from the isolation side coil shaft 7. The single motor rotates in the forward direction, driving the electromagnetic clutch 8 and the grounding side coil shaft 7 to rotate synchronously. At this time, the ratchet 11 on the grounding side transmits torque, while the reverse ratchet 12 rotates freely. Therefore, the drive wheel 9 connected to the ratchet 11 rotates with the coil shaft 7, while the drive wheel 9 connected to the reverse ratchet 12 does not rotate. The protruding part on the drive wheel 9 pushes the pushing surface at the end of the push rod 5, causing the push rod 5 to move linearly. The push rod 5 then pushes the drive slider 3 to move linearly on the guide rail 2. The drive slider 3 drives the self-locking components of the switch body to complete the grounding switch closing action.

[0027] When the grounding switch needs to be opened, the grounding coil shaft 7 remains energized, and the electromagnetic clutch 8 remains engaged with the grounding coil shaft 7. The single motor rotates in reverse, causing the electromagnetic clutch 8 and the grounding coil shaft 7 to rotate synchronously in reverse. At this time, the reverse ratchet 12 on the grounding side transmits torque, while the ratchet 11 idles. Therefore, the drive wheel 9 connected to the reverse ratchet 12 rotates with the coil shaft 7, while the drive wheel 9 connected to the ratchet 11 does not rotate. The protruding part on the drive wheel 9 rotates into the recessed part of the pull rod 6, causing the pull rod 6 to move linearly. The pull rod 6 then pulls the drive slider 3 to move linearly in the opposite direction on the guide rail 2. The drive slider 3 drives the self-locking components of the switch body to complete the grounding switch opening action.

[0028] The opening and closing process of the disconnecting switch is exactly the same as that of the grounding switch. When the disconnecting switch needs to be closed, the isolation side coil shaft 7 is energized, and the electromagnetic clutch 8 slides to the left under the action of electromagnetic force. The electromagnetic clutch 8 engages with the spline and keyway of the isolation side coil shaft 7 and disengages from the grounding side coil shaft 7. The single motor rotates in the forward direction, driving the electromagnetic clutch 8 and the isolation side coil shaft 7 to rotate synchronously. At this time, the ratchet 11 on the isolation side drives the switch, and the reverse ratchet 12 rotates freely. The drive wheel 9 connected to the ratchet 11 pushes the push rod 5 to move linearly, which in turn pushes the drive slider 3 to slide along the guide rail 2, completing the closing action of the disconnecting switch.

[0029] When the disconnector needs to be opened, the single motor rotates in reverse, the reverse ratchet 12 on the isolation side drives the ratchet 11 to rotate freely, and the drive wheel 9 connected to the reverse ratchet 12 drives the pull rod 6 to move in a straight line, which in turn pulls the drive slider 3 to slide in the reverse direction along the guide rail 2 to complete the disconnector opening action.

[0030] This invention effectively solves the problems of jamming and easy motor burnout during start-up and shutdown of traditional three-station mechanisms through the above-described structure and control method. At the same time, it adopts a single motor drive, which reduces costs, has a compact structure, and is reliable in operation. It is suitable for driving isolation and grounding switches of various high-voltage combined electrical appliances.

[0031] Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Anyone skilled in the art can make various modifications and alterations without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be determined by the claims.

Claims

1. A single-motor driven anti-jamming three-position drive device, characterized in that, It includes a single motor, an electromagnetic clutch (8), and symmetrically arranged isolation side transmission units and grounding side transmission units. The isolation side transmission units and the grounding side transmission units are used to drive the opening and closing of the isolation switch and the grounding switch, respectively. The electromagnetic clutch (8) is connected to the output shaft of the single motor and can slide along the axial direction to selectively engage with the isolation side transmission unit or the grounding side transmission unit. The isolation side transmission unit and the grounding side transmission unit have the same structure, both including a coil shaft (7), a drive wheel (9), a drive support (10), a ratchet (11), a reverse ratchet (12), a push rod (5), a pull rod (6), a support (4), a drive slider (3), a guide rail (2), and a guide rail support (1). One end of the coil shaft (7) can engage with the electromagnetic clutch (8) for transmission. Two drive wheels (9) are installed on the same coil shaft (7). One drive wheel (9) is connected to the coil shaft (7) through the ratchet (11), and the other drive wheel (9) is connected to the coil shaft (7) through the reverse ratchet (12). The unidirectional transmission directions of the ratchet (11) and the reverse ratchet (12) are opposite. The two drive wheels (9) are respectively engaged with the push rod (5) and the pull rod (6). The push rod (5) and the pull rod (6) are both supported by the support (4). The ends of the push rod (5) and the pull rod (6) are connected to the drive slider (3). The guide rail (2) is fixedly installed by the guide rail support (1), and the drive slider (3) is slidably installed on the guide rail (2). The drive slider (3) is used to connect with the self-locking component of the switch body and drive the switch body to complete the opening and closing action.

2. The single-motor driven anti-jamming three-station drive device according to claim 1, characterized in that, Both ends of the electromagnetic clutch (8) are provided with splines. The end of the coil shaft (7) facing the electromagnetic clutch (8) is provided with a keyway that matches the spline. When the electromagnetic clutch (8) slides axially, the spline at one end engages with the keyway of the corresponding side coil shaft (7), and the spline at the other end disengages from the keyway of the other side coil shaft (7).

3. The single-motor driven anti-jamming three-position drive device according to claim 1, characterized in that, The drive wheel (9) has a protruding part, the end of the push rod (5) has a pushing surface that matches the protruding part of the drive wheel (9), and the pull rod (6) has a recessed part that matches the protruding part of the drive wheel (9).

4. The single-motor driven anti-jamming three-station drive device according to claim 1, characterized in that, The drive support (10) is used to provide rotational support for the two drive wheels (9).

5. A control method for a single-motor driven anti-jamming three-position drive device as described in any one of claims 1-4, characterized in that, This includes the control steps for opening and closing the grounding switch and the control steps for opening and closing the disconnecting switch; The specific steps for controlling the opening and closing of the grounding switch are as follows: S11: When the grounding side coil shaft (7) is energized, the electromagnetic clutch (8) slides axially to the grounding side under the action of electromagnetic force. The electromagnetic clutch (8) engages with the spline and keyway of the grounding side coil shaft (7) and disengages from the isolation side coil shaft (7). S12: When the grounding switch is closed, the single motor rotates in the forward direction, driving the electromagnetic clutch (8) and the grounding side coil shaft (7) to rotate synchronously. At this time, the ratchet (11) on the grounding side is driven, and the reverse ratchet (12) is idle. The drive wheel (9) connected to the ratchet (11) rotates with the coil shaft (7). Its protruding part pushes the push rod (5) to make linear motion. The push rod (5) then pushes the drive slider (3) to slide along the guide rail (2). The drive slider (3) drives the self-locking parts of the switch body to complete the grounding switch closing action. S13: When the grounding switch is opened, the single motor rotates in the reverse direction, driving the electromagnetic clutch (8) and the grounding side coil shaft (7) to rotate in the reverse direction synchronously. At this time, the reverse ratchet (12) on the grounding side is driven, and the ratchet (11) rotates freely. The drive wheel (9) connected to the reverse ratchet (12) rotates with the coil shaft (7). Its protruding part enters the recessed part of the pull rod (6) to drive the pull rod (6) to make a linear motion. The pull rod (6) then pulls the drive slider (3) to slide in the reverse direction along the guide rail (2). The drive slider (3) drives the self-locking parts of the switch body to complete the grounding switch opening action. The opening and closing control steps of the disconnecting switch are in the same principle as the opening and closing control steps of the grounding switch, specifically as follows: S21: When the isolation side coil shaft (7) is energized, the electromagnetic clutch (8) slides axially to the isolation side under the action of electromagnetic force. The electromagnetic clutch (8) engages with the spline and keyway of the isolation side coil shaft (7) and disengages from the grounding side coil shaft (7). S22: When the disconnect switch is closed, the single motor rotates in the forward direction, driving the electromagnetic clutch (8) and the isolation side coil shaft (7) to rotate synchronously. At this time, the ratchet (11) on the isolation side is driven, and the reverse ratchet (12) is idle. The drive wheel (9) connected to the ratchet (11) rotates with the coil shaft (7). Its protruding part pushes the push rod (5) to make linear motion. The push rod (5) then pushes the drive slider (3) to slide along the guide rail (2). The drive slider (3) drives the self-locking parts of the switch body to complete the disconnect switch closing action. S23: When the disconnecting switch is opened, the single motor rotates in the reverse direction, driving the electromagnetic clutch (8) and the isolation side coil shaft (7) to rotate in the reverse direction synchronously. At this time, the reverse ratchet (12) on the isolation side is driven, the ratchet (11) is idle, and the drive wheel (9) connected to the reverse ratchet (12) rotates with the coil shaft (7). Its protruding part enters the recessed part of the pull rod (6) to drive the pull rod (6) to make a linear motion. The pull rod (6) then pulls the drive slider (3) to slide in the reverse direction along the guide rail (2). The drive slider (3) drives the self-locking parts of the switch body to complete the disconnecting switch opening action.

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