A vacuum tube drive device and on-load tap changer

Abstract

The present invention provides a vacuum tube drive device and an on-load tap changer. The device comprises an upper support plate, a lower support plate, a cam plate, a first transmission mechanism, a lifting mechanism, and a vacuum tube. The lifting mechanism is arranged between the upper and lower support plates along the axial direction of the upper support plate in a positionally adjustable manner. One end of the vacuum tube is connected to the upper support plate, and the other end is connected to the lifting mechanism. The cam plate is provided with end cam profiles arranged along the circumference of the cam plate, and the end cam profiles are respectively connected to the power input end of the first transmission mechanism. The first transmission mechanism is provided with multiple first power output ends, each of which is respectively connected to the lifting mechanism. The first transmission mechanism of the present invention can simultaneously control the opening and closing of multiple vacuum tubes, thereby improving space utilization and resolving the problem that existing vacuum tube drive devices use a single lever to control the opening and closing of a single vacuum tube, which requires a large amount of space when there are a large number of vacuum tubes.

Description

Technical Field

[0001] The present invention relates to the technical field of on-load tap changers, and in particular to a vacuum tube drive device and an on-load tap changer. Background Art

[0002] On-load tap-changers are essential and frequently operated core components of AC and DC converter transformers, playing an irreplaceable role in maintaining grid voltage stability and optimizing power flow distribution. For DC projects in particular, on-load tap-changers are crucial for power regulation and economical, flexible operation of DC transmission. The vacuum tube mechanism, a crucial component of the on-load tap-changer's switching core, operates by driving the vacuum tube drive mechanism via a transmission shaft, controlling the opening and closing of the vacuum tubes, and achieving contact and separation between the moving and static contacts in the vacuum interrupter, thus interrupting the current and extinguishing the vacuum arc, ultimately achieving the on-off function described in the circuit topology diagram.

[0003] Currently, the vacuum tube drive devices used in on-load tap changers, both domestically and internationally, mostly utilize various combinations of cams and levers. Rotation of the central shaft drives the cam, which transmits motion via rollers to the lever mechanism, thereby actuating the vacuum tube on and off. Cams include cylindrical cams, circumferential cams, and end cams. Levers are categorized as either leverless or leverless, and as having or not having a roller at the end of the lever. Different cam and lever combinations are selected based on the operating environment requirements of the tap changer to improve its efficiency and reliability.

[0004] In order to reduce the driving force and improve the axial pulling accuracy, levers are often used in vacuum tube driving mechanisms, and rollers are placed at the ends of the levers to reduce wear, and a guide sleeve structure is used to ensure the axial accuracy of the lifting rod in pulling the vacuum tube up and down. However, the existing vacuum tube driving device uses a single lever to control the opening and closing of a single vacuum tube, which requires a large space when the number of vacuum tubes is large. Summary of the Invention

[0005] In view of this, the present invention proposes a vacuum tube drive device and an on-load tap changer, aiming to solve the problem that the existing vacuum tube drive device uses a single lever to control the disconnection of a single vacuum tube, which requires a large space when the number of vacuum tubes is large.

[0006] On the one hand, the present invention provides a vacuum tube drive device, which includes: an upper support plate, a lower support plate, a cam plate, a first transmission mechanism, a lifting mechanism and a vacuum tube; wherein the lifting mechanism is arranged between the upper support plate and the lower support plate in an axial direction of the upper support plate in a position-adjustable manner, one end of the vacuum tube is connected to the upper support plate, and the other end is connected to the lifting mechanism; the cam plate is rotatably arranged on the lower support plate, and the cam plate is provided with an end cam profile arranged along the circumferential direction of the cam plate; the power input end of the first transmission mechanism cooperates with the end cam profile, the first transmission mechanism is provided with multiple first power output ends, each of the first power output ends is respectively connected to a corresponding lifting mechanism, when the cam plate rotates, the cam plate drives the end cam profile to rotate synchronously, thereby causing the end cam profile to input power to the power input end of the first transmission mechanism, thereby driving the multiple lifting mechanisms to perform synchronous position adjustment, so as to achieve the synchronous and simultaneous switching between closing and opening of the multiple vacuum tubes.

[0007] Furthermore, in the above-mentioned vacuum tube driving device, the end face cam profile includes: at least two protrusions spaced apart along the circumferential direction of the cam disc; wherein a groove is formed between any two adjacent protrusions.

[0008] Furthermore, in the above-mentioned vacuum tube driving device, the end wall surface of the protrusion is in a cam slope structure, and the slope of the cam slope structure is determined based on the pulling speed of the vacuum tube.

[0009] Furthermore, in the above-mentioned vacuum tube driving device, the first transmission mechanism includes: a first roller, a double-lifting lever and a support frame; wherein the support frame is arranged on the lower support plate; the double-lifting lever is provided with a power input end, and the double-lifting lever is also provided with two power output ends located on the same side, and the power output end of the double-lifting lever is located on opposite sides of the power input end of the double-lifting lever; the double-lifting lever is rotatably arranged on the support frame at an intermediate position between the power output end and the power input end of the double-lifting lever, and the power input end of the double-lifting lever is rotatably connected to the first roller for pressing and contacting the end face cam profile; when the cam disk rotates and drives the end face cam profile to rotate synchronously, the first roller is synchronously adjusted in height with the height change of the end face cam profile, so as to input power to the single lifting lever, so that the single lifting lever swings and the power output end of the single lifting lever can press the lifting mechanism to adjust the vertical position of the lifting mechanism.

[0010] Furthermore, the above-mentioned vacuum tube driving device also includes: a second transmission mechanism; wherein, the end face cam profile is multiple and is distributed in sequence along the radial direction of the cam disc from the axis to the periphery, and part of the end face cam profile cooperates with the power input end of the first transmission mechanism; another part of the end face cam profile cooperates with the power input end of the second transmission mechanism, and the second transmission mechanism is provided with a second power output end, and the second power input end is connected to the corresponding pulling mechanism, when the cam disc rotates, the cam disc drives the end face cam profile to rotate synchronously, and then the end face cam profile inputs power to the power input end of the second transmission mechanism that cooperates with the end face cam profile, thereby driving the pulling mechanism to adjust its position to realize the switching of the vacuum tube between closing and opening.

[0011] Furthermore, in the above-mentioned vacuum tube driving device, the second transmission mechanism includes: a second roller, a single lifting lever and a support seat; wherein the support seat is arranged on the lower support plate; the single lifting lever is rotatably arranged on the support seat at an intermediate position between the power output end and the power input end of the single lifting lever, and the power input end of the single lifting lever is rotatably connected to the second roller, and the second roller is used to press and contact the end face cam profile line. When the cam disk rotates and drives the end face cam profile line to rotate synchronously, the second roller is synchronously adjusted in height with the height change of the end face cam profile line to input power to the single lifting lever, so that the single lifting lever swings and the power output end of the single lifting lever can press the lifting mechanism to adjust the vertical position of the lifting mechanism.

[0012] Furthermore, in the above-mentioned vacuum tube driving device, the lifting mechanism includes: a guide sleeve, the guide sleeve is located between the upper support plate and the lower support plate and is installed on the lower support plate; the lifting rod is slidably provided in the guide sleeve along the axial direction of the guide sleeve.

[0013] Furthermore, in the above-mentioned vacuum tube driving device, the guide sleeve and the lifting rod are both provided with a waist-shaped through hole, and the first power output end or the second power output end is movably inserted into the waist-shaped through hole; the first power output end or the second power output end is also provided with a waist-shaped mounting hole, and the lifting rod is provided with a connecting shaft, which is connected to the first power output end or the second power output end in a manner that can slide along the length direction of the waist-shaped mounting hole, and is used to drive the lifting rod to slide along the axial direction of the guide sleeve when the first power output end or the second power output end performs circular motion.

[0014] Furthermore, in the above-mentioned vacuum tube driving device, when the cam disk rotates, at least one of the first transmission mechanisms and at least one of the second transmission mechanisms perform staggered motion under the action of the end face cam profile, or at least two of the first transmission mechanisms perform staggered motion under the action of the end face cam profile, or at least two of the second transmission mechanisms perform staggered motion under the action of the end face cam profile, thereby realizing staggered driving of multiple vacuum tubes.

[0015] Furthermore, in the above-mentioned vacuum tube driving device, each of the pulling mechanisms is also connected to a reset mechanism for applying a reset force to the pulling mechanism to move the pulling mechanism toward the upper support plate, so that the vacuum tube is closed.

[0016] Furthermore, in the above-mentioned vacuum tube driving device, a rotating shaft is provided on the cam disc for driving the cam disc to rotate.

[0017] On the other hand, the present invention further provides an on-load tap changer, which is provided with the above-mentioned vacuum tube driving device.

[0018] The vacuum tube drive device and on-load tap changer provided by the present invention utilize the connection between a second transmission mechanism and the end cam profile of a cam disc to adjust the vertical position of a lifting mechanism, thereby driving the switching of the vacuum tubes. In particular, the second transmission mechanism can simultaneously control the opening and closing of multiple vacuum tubes, improving space utilization and resolving the problem of existing vacuum tube drive devices that use a single lever to control the opening and closing of a single vacuum tube, resulting in a large space requirement when a large number of vacuum tubes are present. This device also has the following advantages:

[0019] First, by using the protrusions and grooves spaced at different radial positions on a single cam disc, a single cam disc can drive multiple levers in an interleaved manner, thereby improving the accuracy of lifting.

[0020] Second, the driving device is less susceptible to impact, has high reliability and long service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present invention. The same reference symbols are used throughout the drawings to represent the same components. In the drawings:

[0022] Figure 1 A schematic structural diagram of a vacuum tube driving device provided in an embodiment of the present invention;

[0023] Figure 2A schematic structural diagram of another aspect of the vacuum tube driving device provided by an embodiment of the present invention;

[0024] Figure 3 A schematic structural diagram of the vacuum tube driving device provided by an embodiment of the present invention from another perspective;

[0025] Figure 4 A schematic structural diagram of a partial position of a vacuum tube driving device provided by an embodiment of the present invention.

[0026] Description of reference numerals:

[0027] 1-upper support plate, 2-lower support plate, 3-rotating shaft, 4-cam disc, 41-end cam profile, 4101-first end cam profile, 4102-second end cam profile, 4103-third end cam profile, 411-bump, 412-groove, 5-first transmission mechanism, 501-first transmission mechanism A, 502-first transmission mechanism B, 51-first roller, 52-single lifting lever, 53-support seat, 6-second transmission mechanism, 61-second roller, 62-double lifting lever, 63 -Support frame, 7-lifting mechanism, 701-first lifting mechanism, 702-second lifting mechanism, 703-third lifting mechanism, 704-fourth lifting mechanism, 71-lifting rod, 72-guide sleeve, 73-waist-shaped through hole, 8-vacuum tube, 801-first vacuum tube, 802-second vacuum tube, 803-third vacuum tube, 804-fourth vacuum tube, 9-reset mechanism, 901-first reset mechanism, 902-second reset mechanism, 903-third reset mechanism, 904-fourth reset mechanism. DETAILED DESCRIPTION

[0028] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art. It should be noted that, unless there is a conflict, the embodiments of the present disclosure and the features described in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0029] Example of vacuum tube drive device:

[0030] See also Figures 1 to 4 , which shows the preferred structure of the vacuum tube driving device provided by the embodiment of the present invention. As shown in the figure, the device includes: an upper support plate 1, a lower support plate 2, a rotating shaft 3, a cam plate 4, a first transmission mechanism 6, a lifting mechanism 7, and a vacuum tube 8; wherein,

[0031] The upper support plate 1 and the lower support plate 2 are spaced apart, and the lifting mechanism 7 is arranged along the axial direction of the upper support plate 1 (such as Figure 2 The vertical direction shown in FIG) is arranged between the upper support plate 1 and the lower support plate 2 in a position-adjustable manner, and one end of the vacuum tube 8 (as shown in FIG) Figure 2 The upper end shown in FIG) is connected to the upper support plate 1, and the other end (as shown Figure 2 The lower end shown in the figure is connected to the pulling mechanism 7. Specifically, the upper support plate 1 and the lower support plate 2 can both be disc structures and are arranged in parallel and at intervals along the axial direction, that is, the two are coaxially arranged to support and fix each component. In this embodiment, there can be multiple vacuum tubes 8, which can be supported by the upper support plate 1, that is, the upper support plate 1 serves as a bracket for the vacuum tube 8. The pulling mechanism 7 can be arranged between the upper support plate 1 and the lower support plate 2 along the axial direction of the upper support plate 1 in a position-adjustable manner so as to drive the vacuum tube 8 and realize the switching between closing and opening of the vacuum tube 8. In this embodiment, the pulling mechanism 7 can be arranged in a one-to-one correspondence with the vacuum tube 8, and the pulling mechanism 7 can be arranged directly below the corresponding vacuum tube 8 so as to directly drive the vacuum tube 8 through the pulling mechanism 7. Among them, the pulling mechanism 7 and the vacuum tube 8 can both be arranged along the axial direction of the upper support plate 1. In this embodiment, the lower end of the vacuum tube 8 can be connected to the upper end of the lifting mechanism 7 through a threaded connection. For example, the lower end of the vacuum tube 8 can be provided with a threaded hole, and the upper end of the lifting mechanism 7 can be provided with a corresponding threaded rod. The upper end of the vacuum tube 8 can be fixedly connected to the upper support plate 1 through a connecting piece (not shown in the figure). The lower end of the vacuum tube 8 can be connected to the moving contact of the vacuum tube 8, and the upper end can be connected to the static contact of the vacuum tube 8. The moving contact moves along the axial direction of the vacuum tube 8 (such as Figure 2 The movable contact moves in the vertical direction shown in the figure to move closer to the static contact until it contacts the static contact to achieve closing, or moves away from the static contact to disconnect the movable contact from the static contact to achieve switching, that is, to complete the switching between closing and opening, that is, the switching between opening and opening.

[0032] For example, Figure 2The device shown includes four vacuum tubes 8, that is, the device belongs to a driving device for a single-phase four-vacuum tube on-load tap changer. The four vacuum tubes 8 are respectively a first vacuum tube 801, a second vacuum tube 802, a third vacuum tube 803 and a fourth vacuum tube 804. They are distributed in a circular manner along the circumference of the upper support plate 1 from left to right and can be arranged at equal intervals. In addition, the top ends of the first vacuum tube 801, the second vacuum tube 802, the third vacuum tube 803 and the fourth vacuum tube 804 are all fixedly connected to the upper support plate 1 through connecting pieces; there are also four pulling mechanisms 7, namely a first pulling mechanism 701, a second pulling mechanism 702 and a fourth pulling mechanism 703. 02, the third pulling mechanism 703 and the fourth pulling mechanism 704 are respectively disposed directly below the first vacuum tube 801, the second vacuum tube 802, the third vacuum tube 803, and the fourth vacuum tube 804. Furthermore, the top ends of the first pulling mechanism 701, the second pulling mechanism 702, the third pulling mechanism 703, and the fourth pulling mechanism 704 are respectively connected to the bottom ends of the first vacuum tube 801, the second vacuum tube 802, the third vacuum tube 803, and the fourth vacuum tube 804 via threads, thereby respectively driving the switching of the first vacuum tube 801, the second vacuum tube 802, the third vacuum tube 803, and the fourth vacuum tube 804. In this embodiment, the four vacuum tubes 8 form a single phase; however, multiple phases may be provided for simultaneous driving of multiple phases. The number of vacuum tubes 8 in each phase may also be other numbers, and this embodiment does not impose any limitation thereto.

[0033] The cam disc 4 is rotatably mounted on the lower support plate 2, and is provided with an end cam profile 41 arranged along the circumferential direction of the cam disc 4. Specifically, the cam disc 4 can be a disc structure, coaxially mounted on the lower support plate 2, and the cam disc 2 is rotatably connected to the lower support plate 2 to act as a driving disc to drive the first transmission mechanism 6 to move; the top wall of the cam disc 4 (relative to the Figure 2 The first transmission mechanism 6 is adapted to drive the first transmission mechanism 6 to operate. In this embodiment, to facilitate the driving of the cam disc 4, the cam disc 4 is preferably connected to a rotating shaft 3 for connecting to a drive motor (not shown in the figure), so that the drive motor drives the cam disc 4 to rotate, so that the cam disc 4 and the rotating shaft 3 rotate synchronously. The rotating shaft 3 and the cam disc 4 can be coaxially arranged, and the rotating shaft 3 is also coaxially arranged with the upper support plate 1 and the lower support plate 2. That is to say, the upper support plate 1, the lower support plate 2, the rotating shaft 3 and the cam disc 4 are coaxially arranged, and the rotating shaft 3 is rotatably passed through the upper support plate 1 and the lower support plate 2 so that the rotating shaft 3 can be driven to rotate by the drive motor.

[0034] The power input end of the first transmission mechanism 6 cooperates with the end face cam profile 41. The first transmission mechanism 6 is provided with a plurality of first power output ends that move synchronously. Each first power output end is respectively connected to the corresponding pulling mechanism 7. The first transmission mechanism 6 is used to drive the plurality of pulling mechanisms 7 to adjust their positions synchronously under the action of the end face cam profile 41, so as to realize the synchronous and simultaneous switching between closing and opening of a plurality of vacuum tubes 8. When the cam disc 4 rotates, the cam disc 4 drives the end face cam profile 41 to rotate synchronously, thereby causing the end face cam profile 41 to input power to the power input end of the first transmission mechanism 6, thereby driving the plurality of pulling mechanisms 7 to adjust their positions synchronously, so that the plurality of vacuum tubes 8 can switch between closing and opening synchronously. Specifically, the power input end of the first transmission mechanism 6 can cooperate with the end face cam profile 41, and the end face cam profile 41 can change in height when the cam disc 4 rotates, which can drive the first transmission mechanism 6 to move; the first transmission mechanism 6 can be provided with at least two first power output ends that move synchronously, so that when the first transmission mechanism 6 moves, the first power output ends can move synchronously and simultaneously, thereby driving the lifting mechanisms 7 corresponding to each first power output end to perform synchronous position adjustment, thereby realizing synchronous and simultaneous switching of multiple vacuum tubes 8.

[0035] Continue to see Figures 1 to 4 The device also includes: a second transmission mechanism 5; wherein, there are at least two end cam profiles 41, some of which correspond one-to-one with the first transmission mechanism 6 and are connected to the power input end of the corresponding first transmission mechanism 6, and the other part corresponds one-to-one with the second transmission mechanism 5 and is connected to the power input end of the corresponding second transmission mechanism 5. The second transmission mechanism 5 is provided with a second power output end, which is connected to the corresponding pulling mechanism 7. When the cam disc 4 rotates, the cam disc 4 drives the end cam profile 41 to rotate synchronously, and then the end cam profile 41 inputs power to the power input end of the second transmission mechanism 5 that cooperates with the end cam profile 41, thereby driving the pulling mechanism 7 to adjust its position to realize the switching between closing and opening of the vacuum tube 8.

[0036] Specifically, there can be multiple end cam profiles 41 and they are arranged in sequence along the radial direction of the cam disc 4 from the axis of the cam disc 4 to the periphery; wherein, the number of the end cam profiles 41 is adapted to the sum of the number of the second transmission mechanism 5 and the first transmission mechanism 6, that is, a part of the end cam profiles 41 corresponds to the second transmission mechanism 5, that is, each second transmission mechanism 5 is respectively provided with an end cam profile 41, and the power input end of each second transmission mechanism 5 is respectively connected to the corresponding end cam profile 41, so that when the end cam profile 41 changes in height when the cam disc 4 rotates, the second transmission mechanism 5 is driven to move, and the other part of the end cam profiles 41 corresponds to the first transmission mechanism 6, that is, each first transmission mechanism 6 is respectively provided with an end cam profile 41, and the power input end of each first transmission mechanism 6 is respectively connected to the corresponding end cam profile 41, so that when the end cam profile 41 changes in height when the cam disc 4 rotates, the first transmission mechanism 6 is driven to move. There can be at least one second transmission mechanism 5 and at least one first transmission mechanism 6. The number of both can be determined based on actual conditions and is not limited in this embodiment. Furthermore, the power output ends of both mechanisms correspond one-to-one with the lifting mechanism 7. In this embodiment, to avoid interference between the second transmission mechanism 5 and the first transmission mechanism 6, preferably, the second transmission mechanism 5 and the first transmission mechanism 6 are both radially distributed along the cam disc 4, and are arranged at an angle to each other. In this embodiment, by utilizing at least two end cam profiles disposed at different radial positions on a single cam disc, a single cam disc can drive the second transmission mechanism 5 and the first transmission mechanism 6, thereby achieving staggered actuation of multiple vacuum tubes and thereby meeting the switching timing requirements of multiple vacuum tubes.

[0037] For example, Figure 2 In the device shown, the top wall of the cam disc 4 is provided with three end cam profiles 41, namely a first end cam profile 4101, a second end cam profile 4102, and a third end cam profile 4103. These are arranged in sequence along the radial direction of the cam disc 4 from the outer periphery to the axis. That is, the first end cam profile 4101 is arranged at the outermost end, the second end cam profile 4102 is arranged in the middle, and the third end cam profile 4103 is arranged at the innermost end. Figure 2The device shown includes a first transmission mechanism 6 and two second transmission mechanisms 5. The two second transmission mechanisms 5 can be respectively arranged on both sides of the first transmission mechanism 6, namely a second transmission mechanism A 501 and a second transmission mechanism B 502. The second transmission mechanism A 501 is connected to the middle second end cam profile 4102, the second transmission mechanism B 502 is connected to the innermost third end cam profile 4103, and the first transmission mechanism 6 is connected to the outermost first end cam profile 4101; and the first transmission mechanism 6 has two first power output ends, then the second transmission mechanism There are four power output ends in total, including the second transmission mechanism A 501, the second transmission mechanism B 502 and the first transmission mechanism 6, among which the second power output end of the second transmission mechanism A 501 is connected to the first pulling mechanism 701, and the two first power output ends of the first transmission mechanism 6 are respectively connected to the second pulling mechanism 702 and the third pulling mechanism 703, so that the second pulling mechanism 702 and the third pulling mechanism 703 can move synchronously, and then drive the second vacuum tube 802 and the third vacuum tube 803 at the same time; the second power output end of the second transmission mechanism B 502 is connected to the fourth pulling mechanism 704.

[0038] Continue to see Figure 4 In order to ensure the stability of the closure of the vacuum tube 8, preferably, each pulling mechanism 7 is connected to a reset mechanism 9 for applying a reset force, i.e., a feedback force (such as Figure 2 As shown in the upward force) to the pulling mechanism 7, so that the pulling mechanism 7 moves toward the direction close to the upper support plate 1 (as shown in the upward force) to the pulling mechanism 7 Figure 2 As shown in the upward movement), the vacuum tube 8 is closed to avoid the phenomenon that the vacuum tube 8 is difficult to close when relying solely on the first transmission mechanism 6 or the second transmission mechanism 5 when the vacuum tube 8 is heavy. Specifically, the reset mechanism 9 corresponds one-to-one to the lifting mechanism 7. The reset mechanism 9 can store energy when the lifting mechanism 7 moves away from the upper support plate 1, that is, moves downward, and releases energy and applies a reset force, that is, a reverse thrust to the lifting mechanism 7 when the first transmission mechanism 6 or the second transmission mechanism 5 drives the lifting mechanism 7 to move upward, so that the lifting mechanism 7 can move upward to the reset position, and then drive the lower end of the vacuum tube 8 to move so that the vacuum tube 8 is closed. In this embodiment, the reset mechanism 9 can be a reset spring, which can be arranged below the lower support plate 2, with both ends respectively clamped between the lower support plate 2 and the lifting mechanism 7. The lifting rod 71 is arranged at the end below the lower support plate 2 (as shown in the upward movement). Figure 4the bottom end shown in the figure), and the lower end is connected to the bottom end of the lifting rod 71; the return spring can be a tension spring, that is, when the lifting rod 71 moves downward, the distance between the lower end of the lifting rod 71 and the lower support plate 2 becomes larger, the return spring stores energy, and applies an upward return force to the bottom end of the lifting rod 71, so that the lifting rod 71 moves upward to close. Of course, in other embodiments, the return spring can also be arranged above the lower support plate 2, and the lifting rod 71 is provided with a limit platform above the lower support plate 2. The return spring is arranged between the lower support plate 2 and the limit platform, and acts as a compression spring to compress and store energy when the lifting rod 71 moves downward, and can apply an upward return force, i.e., a reverse thrust, to the lifting rod 71, so that the lifting rod 71 returns upward to close.

[0039] For example, Figure 4 The device shown includes four reset mechanisms 9, namely the first reset mechanism 901, the second reset mechanism 902, the third reset mechanism 903 and the fourth reset mechanism 904, which are respectively connected to the first pulling mechanism 701, the second pulling mechanism 702, the third pulling mechanism 703 and the fourth pulling mechanism 704 to apply reset force to the first pulling mechanism 701, the second pulling mechanism 702, the third pulling mechanism 703 and the fourth pulling mechanism 704, so that the first vacuum tube 801, the second vacuum tube 802, the third vacuum tube 803 and the fourth vacuum tube 804 are closed.

[0040] When the cam disc 4 rotates, the first transmission mechanism 6 and the second transmission mechanism 5 perform staggered motion under the action of the end cam profile 41, thereby driving the lifting mechanism 7 to adjust the staggered position, thereby achieving staggered drive of each vacuum tube 8. Specifically, based on the switching timing requirements of the vacuum tube 8 and in combination with the position setting between different end cam profiles 41, at the same time, the power input ends of at least two of the first transmission mechanism 6 and the second transmission mechanism 5 are set at different heights, that is, at different heights of different end cam profiles 41, so that different parts of the vacuum tube 8 are closed and some are open. When the cam disc 4 rotates, each transmission mechanism is driven in turn to perform staggered motion, achieving staggered drive of the first transmission mechanism 6 and multiple second transmission mechanisms 5, and then driving multiple lifting mechanisms 7 to perform staggered motion, thereby achieving staggered drive between multiple vacuum tubes 8.

[0041] For example, Figure 2 In the device shown, Figure 2In the initial state, the power input end of the second transmission mechanism A 501 is set at the high position of the second end surface cam profile 4102 in the middle, the power input end of the first transmission mechanism 6 is set at the high position of the first end surface cam profile 4101 of the outermost circle, and the second transmission mechanism B 502 is set at the low position of the third end surface cam profile 4103 of the innermost circle. At this time, the first vacuum tube 801 is initially disconnected, the fourth vacuum tube 804 is initially closed, and the second vacuum tube 802 and the third vacuum tube 803 are initially disconnected; when the shaft 3 drives the cam plate 4 to rotate forward (such as Figure 2 4. When the second vacuum tube 802 and the third vacuum tube 803 are closed, the second lifting mechanism 702 and the third lifting mechanism 703 are closed. Tube 804 is disconnected; then the power input end of the second transmission mechanism A 501 moves to a low position under the action of the second end face cam profile 4102 in the cam disc 4, so that the second power output end of the second transmission mechanism A 501 drives the first pulling mechanism 701 to move upward, and at the same time, the first reset mechanism 901 applies a reset force to pull the first pulling mechanism 701 back to its original position, so that the first vacuum tube 801 is closed; finally, the first transmission mechanism 6 moves under the action of the cam disc 4, so that the two first power output ends of the first transmission mechanism 6 respectively drive the second pulling mechanism 702 and the third pulling mechanism 703 to move downward, and at the same time, the second reset mechanism 902 and the third reset mechanism 903 store energy, so that the second vacuum tube 802 and the third vacuum tube 803 are disconnected, and the subsequent process is repeated in sequence to complete the staggered switching drive between the disconnection and closure of each vacuum tube 8.

[0042] Continue to see Figure 2, each end face cam profile 41 includes: at least two protrusions 411; wherein, each protrusion 411 is arranged at intervals along the circumferential direction of the cam disc 4, and a groove 412 is formed between any two adjacent protrusions 411. Specifically, at least two protrusions 411 and at least two grooves 412 are arranged in sequence on the same circumference; in order to avoid jamming of the power input end of the first transmission mechanism 6 and the second transmission mechanism 5, preferably, the end wall surface of the protrusion 411 is a cam slope structure, and the slope of the cam slope structure can be determined based on the required pulling speed of the vacuum tube 8, for example, the steeper the slope, the faster the pulling speed. Among them, the protrusion 411 can be a trapezoidal structure, and the groove can also be a trapezoidal groove structure. Of course, in other embodiments, the protrusion 411 and the groove can also be one.

[0043] For example, Figure 2 In the illustrated device, each of the three end cam profiles 41 includes three protrusions 411 and three grooves 412. The central angles of each protrusion 411 and groove 412 can be determined based on practical needs. The ends of the protrusions 411 of the first and third end cam profiles 4101, 4103 can be aligned, while the ends of the second end cam profile 4102 can be staggered with the ends of the first and second end cam profiles 4102. The staggering angle can be determined based on practical needs. For example, the staggering angle and the angle between the first transmission mechanism 6 and the second transmission mechanism 5 can be adapted to the staggered timing between the vacuum tubes 8. This staggering angle is not limited in this embodiment. In this embodiment, each of the three protrusions 411 corresponds to a single-phase vacuum tube 8. The three protrusions 411 can correspond to three-phase vacuum tubes 8, driving all three phases simultaneously. Alternatively, only one or two phases can be provided, driven by the full rotation or reciprocating rotation of the cam disc 4.

[0044] Continue to see Figure 2 The second transmission mechanism 5 includes: a second roller 51, a single lifting lever 52 and a support seat 53; wherein the support seat 53 is arranged on the lower support plate 2, and the middle position of the single lifting lever 52 is rotatably arranged on the support seat 51, and the power input end of the single lifting lever 52 is rotatably connected to the second roller 51, for example, pivotally connected, for pressing and contacting the end face cam profile 41. When the cam disc 4 rotates and drives the end face cam profile 41 to rotate synchronously, the second roller 51 is synchronously adjusted in height with the height change of the end face cam profile 41, so as to input power to the single lifting lever 52, so that the single lifting lever 52 swings and the power output end of the single lifting lever 52 can press the lifting mechanism 7 to adjust the vertical position of the lifting mechanism 7.

[0045] Specifically, the support base 53 can be set on the lower support plate 2, for example, fixed to the lower support plate 2 by bolts. The middle position of the single-lift lever 52, that is, the position between the power output end and the power input end, can be installed on the support base 53, and the single-lift lever 52 can be rotated relative to the support base 53, for example, it can be pivotally connected to the support base 53 through the first support shaft 54; one end of the single-lift lever 52 (such as Figure 2 The lower left end shown in the figure) serves as the power input end, and is connected to a second roller 51. The second roller 51 contacts the corresponding end cam profile 41 to drive the single-lifting lever 52 to rotate as the cam disc 4 rotates, and then according to the lever principle, the other end of the single-lifting lever 52 moves upward or downward; the purpose of providing the second roller 51 is to better reduce vibration and friction. The second roller 51 and the power input end of the single-lifting lever 52 can be connected through a bearing and a retaining spring, that is, a bearing is provided between the second roller 51 and the power input end of the single-lifting lever 52, and a retaining spring is provided on the outside of the bearing. The other end of the single-lifting lever 52 (as shown in the figure) Figure 2 The upper right end (shown as a second power output terminal) is connected to the lifting mechanism 7. Rotation of the single lifting lever 52 drives the lifting mechanism 7 to adjust its vertical position, i.e., move it upward or downward. In this embodiment, the structure of the second transmission mechanism B 502 is used as an example to illustrate the second transmission mechanism 5. The structure of the second transmission mechanism A 501 is identical to that of the second transmission mechanism B 502 and is not further described here.

[0046] Continue to see Figure 2 and Figure 3 The first transmission mechanism 6 includes: a first roller 61, a double-lifting lever 62 and a support frame 63; wherein the support frame 63 is arranged on the lower support plate 2, the double-lifting lever 62 is provided with a power input end and two power output ends located on the same side, and the power output end and the power input end of the double-lifting lever 62 are located on opposite sides (such as Figure 2 The upper and lower sides shown in the figure) are rotatably arranged on the support frame 63 at the middle position between the power output end and the power input end of the double lifting lever 62. The power input end of the double lifting lever 62 is rotatably connected to the first roller 61, for example, pivotally connected, for pressing and contacting the end face cam profile 41, so that when the cam disc 4 rotates, the end face cam profile 41 is driven to rotate synchronously. The first roller 61 is synchronously adjusted in height with the height change of the end face cam profile 41 to input power to the double lifting lever 62, so that the double lifting lever 62 swings and the power output end of the double lifting lever 62 can simultaneously press the lifting mechanism 7 to make the lifting mechanism 7 perform synchronous vertical position adjustment.

[0047] Specifically, the support frame 63 can be set on the lower support plate 2, for example, fixed to the lower support plate 2 by bolts. The middle position of the double-lifting lever 62, that is, the position between the power output end and the power input end, can be installed on the support frame 63, and the double-lifting lever 62 can be rotated relative to the support frame 63, for example, it can be pivotally connected to the support frame 63 through a second support shaft (not shown in the figure); one end of the double-lifting lever 62 (such as Figure 2 The lower end shown in the figure) serves as the power input end, and is connected to a first roller 61. The first roller 61 contacts the corresponding end cam profile 41 to drive the double-lifting lever 62 to rotate as the cam disc 4 rotates, and then according to the lever principle, the other end of the double-lifting lever 62 moves upward or downward at the same time; the purpose of providing the first roller 61 is to be more conducive to reducing vibration and friction. Among them, the first roller 61 and the power input end of the double-lifting lever 62 can be connected through a bearing and a retaining spring, that is, a bearing is provided between the first roller 61 and the power input end of the double-lifting lever 62, and a retaining spring is provided on the outside of the bearing. The other end of the double-lifting lever 62 (as shown in the figure) Figure 2 The upper right end shown in the figure can be provided with two power output ends as the two first power output ends of the first transmission mechanism 6, which are respectively connected to the corresponding lifting mechanisms 7, so that when the double lifting levers 62 are rotated, the lifting mechanism 7 can be driven to adjust its position vertically, that is, to move upward or downward.

[0048] In this embodiment, the single lifting lever 52 and the double lifting lever 62 are both arranged along the radial direction of the cam disc 4, and are arranged at an angle therebetween. Specifically, the angle between the single lifting lever 52 and the double lifting lever 62 can be determined based on the relative staggered positions of the end cam profiles 41 corresponding to the second roller 51 and the first roller 61, and can be determined based on the switching sequence of the vacuum tube 8. The double lifting lever 62 can be arranged between the two single lifting levers 52, and the angle between the double lifting lever 62 and the single lifting lever 52 can be determined based on the staggered drive sequence of the second vacuum tube 802 and the third vacuum tube 803. This allows the double lifting lever 62 and the two single lifting levers 52 to switch positions in an staggered manner, thereby achieving staggered drive of the multiple vacuum tubes 8 according to a preset staggered sequence. The preset staggered sequence can be determined based on actual conditions and is not limited in this embodiment.

[0049] Continue to see Figure 4 The lifting mechanism 7 includes a lifting rod 71 and a guide sleeve 72; wherein the guide sleeve 72 is located between the upper support plate 1 and the lower support plate 2 and is mounted on the lower support plate 2; the lifting rod 71 is arranged along the axial direction of the guide sleeve 72 (such as Figure 4The guide sleeve 72 is connected to the guide sleeve 72 in a sliding manner (in the vertical direction shown), so that the lifting rod 71 can be guided by the guide sleeve 72 to slide up and down, thereby ensuring the axial accuracy of the lifting rod 71 in lifting the vacuum tube 8 up and down, avoiding axial deviation in the vacuum tube lifting process, that is, ensuring that the vacuum tube 8 is always parallel to the axis of the cam plate 3 during the lifting process. Specifically, the guide sleeve 72 and the lifting rod 71 are both arranged along the axial direction of the camshaft 3, and can be arranged coaxially with the vacuum tube 8. Among them, the bottom end of the guide sleeve 72 can be fixedly mounted on the support seat 53 or the lower support plate 2 by bolts, and of course it can also be fixedly mounted on the support frame 63. In this embodiment, the lifting rod 71 can also be slidably penetrated into the lower support plate 2, so that the reset mechanism 9 can be arranged between the lower end of the lifting rod 71 and the lower support plate 2.

[0050] For example, Figure 3 As shown, the bottom ends of the guide sleeve 72 of the first lifting mechanism 701 and the guide sleeve 72 of the fourth lifting mechanism 704 are respectively fixedly mounted on the support seat 53 of the second transmission mechanism A 501 and the support seat 53 of the second transmission mechanism B 502; the bottom ends of the guide sleeve 72 of the second lifting mechanism 702 and the guide sleeve 72 of the third lifting mechanism 703 are both fixedly mounted on the lower support plate 2; the lifting rods 71 ​​of the first lifting mechanism 701, the second lifting mechanism 702, the third lifting mechanism 703 and the fourth lifting mechanism 704 are all capable of sliding up and down and passing through the lower support plate 2, and are also capable of sliding up and down and passing through the guide sleeves 72 of the first lifting mechanism 701, the second lifting mechanism 702, the third lifting mechanism 703 and the fourth lifting mechanism 704.

[0051] Continue to see Figure 4 , the guide sleeve 72 and the lifting rod 71 are axially (such as Figure 4The first power output end or the second power output end is movably inserted into the waist-shaped through hole 73; the first power output end or the second power output end is also provided with a mounting hole (not shown in the figure) in a waist-shaped structure arranged along the length direction, and the lifting rod 71 is provided with a connecting shaft (not shown in the figure), which is connected to the first power output end or the second power output end in a manner that it can slide along the length direction of the mounting hole, and is used to drive the lifting rod 71 to slide along the axial direction of the guide sleeve 72 when the first power output end or the second power output end performs a circular motion. Specifically, waist-shaped through holes 73 are provided on the guide sleeve 72 and the lifting rod 71, and the power output side of the single lifting lever 52 or the double lifting lever 62, that is, the power output rod, is movably passed through the waist-shaped through hole 73, so that the single lifting lever 52 or the double lifting lever 62 can perform circular motion, that is, rotate; since the power output end performs circular motion around the fulcrum, that is, the middle position, when the single lifting lever 52 or the double lifting lever 62 rotates, there is displacement in both horizontal and vertical directions; to ensure that the lifting rod 71 only moves vertically The single lifting lever 52 or the double lifting lever 62 is provided with a waist-shaped mounting hole along the length direction, and the lifting rod is provided with a connecting shaft passing through the waist-shaped mounting hole. The connecting shaft can slide along the length direction of the waist-shaped mounting hole, and the connecting shaft slides along the direction of the power output rod of the single lifting lever 52 or the double lifting lever 62 to ensure that when the single lifting lever 52 or the double lifting lever 62 rotates, the distance between the lifting rod 71 and the fulcrum of the single lifting lever 52 or the double lifting lever 62 remains unchanged, thereby ensuring that the lifting rod 71 only moves vertically.

[0052] The specific working process of the device: Figure 2 In the initial state, the first vacuum tube 801 is initially disconnected, the fourth vacuum tube 804 is initially closed, and the second vacuum tube 802 and the third vacuum tube 803 are initially disconnected; when the shaft 3 drives the cam plate 4 to rotate forward (such as Figure 24 and 503 are rotated in the counterclockwise direction as shown in the figure), the first roller 61 moves to the low position under the action of the first end surface cam profile 4101 in the cam disc 4, so that the double pulling lever 62 in the first transmission mechanism 6 rotates, and then the two first power output ends of the first transmission mechanism 6 respectively drive the second pulling mechanism 702 and the third pulling mechanism 703 to move upward, and at the same time, the second reset mechanism 902 and the third reset mechanism 903 respectively apply reset forces to make the second pulling mechanism 702 and the third lifting mechanism 703 move upward and reset, so that the second vacuum tube 802 and the third vacuum tube 803 are closed; then the second roller 51 in the second transmission mechanism B 502 moves to the high position under the action of the third end surface cam profile 4103 in the cam disc 4, so that the single pulling lever 52 in the second transmission mechanism B 502 rotates, so that the second power output end of the second transmission mechanism B 502 drives the fourth pulling mechanism 704 to move downward, and at the same time, the fourth reset mechanism 904 stores energy, so that the fourth vacuum tube 804 is disconnected; then the second transmission mechanism B 502 is rotated to the low position, so that the double pulling lever 62 in the first transmission mechanism 6 rotates, and then the two first power output ends of the first transmission mechanism 6 respectively drive the second pulling mechanism 702 and the third lifting mechanism 703 to move upward, and at the same time, the second reset mechanism 904 stores energy, so that the fourth vacuum tube 804 is disconnected; The second roller 51 in the mechanism A 501 moves to a low position under the action of the second end surface cam profile 4102 in the cam disc 4, causing the single lifting lever 52 in the second transmission mechanism A 501 to rotate, thereby causing the second power output end of the second transmission mechanism A 501 to drive the first lifting mechanism 701 to move upward. At the same time, the first reset mechanism 901 applies a reset force to pull the first lifting mechanism 701 back to its original position, so that the first vacuum tube 801 is closed; finally, the first transmission mechanism 6 moves under the action of the cam disc 4, and the first roller 61 moves to a high position under the action of the first end surface cam profile 4101 in the cam disc 4. The double lifting lever 62 rotates, causing the two first power output ends of the first transmission mechanism 6 to respectively drive the second lifting mechanism 702 and the third lifting mechanism 703 to move downward, and at the same time, the second reset mechanism 902 and the third reset mechanism 903 store energy, so that the second vacuum tube 802 and the third vacuum tube 803 are disconnected. This process is then repeated step by step to complete the switching cycle between the opening and closing of each vacuum tube 8.

[0053] In summary, the vacuum tube drive device provided in this embodiment utilizes the connection between the second transmission mechanism and the end cam profile to achieve vertical position adjustment of the lifting mechanism, thereby driving the switching of the vacuum tubes. In particular, the second transmission mechanism can simultaneously control the opening and closing of multiple vacuum tubes, improving space utilization and resolving the problem of existing vacuum tube drive devices that use a single lever to control the opening and closing of a single vacuum tube, resulting in a large space requirement when there are a large number of vacuum tubes. This device also has the following advantages:

[0054] First, by using the protrusions and grooves spaced at different radial positions on a single cam disc, a single cam disc can drive multiple levers in an interleaved manner, thereby improving the accuracy of lifting.

[0055] Second, the driving device is less susceptible to impact, has high reliability and long service life.

[0056] On-load tap-changer example:

[0057] This embodiment further provides an on-load tap changer, which is provided with the above-mentioned vacuum tube drive device. In this embodiment, the on-load tap changer may include: an on-load tap changer body and the above-mentioned vacuum tube drive device; wherein the on-load tap changer body is provided with a high-potential line and a low-potential line; the fixed contact of the vacuum tube 8 of the vacuum tube drive device is connected to the high-potential line, and the movable contact of the vacuum tube 8 is connected to the low-potential line, for achieving conduction and disconnection between the high-potential line and the low-potential line under the action of the vacuum tube drive device; and / or, the fixed contact of the vacuum tube 8 of the vacuum tube drive device is connected to the low-potential line, and the movable contact of the vacuum tube 8 is connected to the high-potential line, for achieving conduction and disconnection between the high-potential line and the low-potential line under the action of the vacuum tube drive device. Specifically, the high potential line and the low potential line can be set in one-to-one correspondence and each can be provided with multiple ones. Each corresponding high potential line and low potential line corresponds to a vacuum tube 8 respectively. The moving contact and the static contact of the vacuum tube 8 are respectively connected to the corresponding high potential line and the low potential line. When the moving contact is connected to the high potential line, the static contact is connected to the low potential line. It can also be connected to the low potential line through the moving contact and connected to the high potential line through the static contact. As for the specific connection method, this embodiment does not impose any limitation on it.

[0058] In this embodiment, the high-potential line and the low-potential line are switched on and off by the vacuum tube 8, that is, when the moving contact and the contact head of the vacuum tube 8 are in contact, the high-potential line and the low-potential line are connected, so that the two are at the same potential, thereby achieving current conduction; when the moving contact and the contact head of the vacuum tube 8 are separated, the high-potential line and the low-potential line are disconnected.

[0059] The specific implementation process of the vacuum tube driving device can be found in the above description, and will not be described in detail in this embodiment.

[0060] Since the vacuum tube drive device has the above-mentioned effects, the on-load tap changer body having the vacuum tube drive device also has corresponding technical effects.

[0061] It should be noted that, in the description of the present invention, terms such as "up", "down", "left", "right", "inside", and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings. This is only for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0062] Furthermore, it should be noted that, in the description of the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediary, or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0063] Obviously, those skilled in the art may make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if such changes and modifications fall within the scope of the claims and their equivalents, the present invention is intended to include such changes and modifications.

Claims

1. A vacuum tube driving device, characterized in that: include: Upper support plate, lower support plate, cam plate, first transmission mechanism, lifting mechanism and vacuum tube; wherein, The lifting mechanism is arranged between the upper support plate and the lower support plate in an adjustable manner along the axial direction of the upper support plate, one end of the vacuum tube is connected to the upper support plate, and the other end is connected to the lifting mechanism; The cam disc is rotatably arranged on the lower support plate, and the cam disc is provided with an end face cam profile arranged along the circumferential direction of the cam disc; The power input end of the first transmission mechanism cooperates with the end surface cam profile. The first transmission mechanism is provided with a plurality of first power output ends, each of which is connected to a corresponding lifting mechanism. When the cam disc rotates, the cam disc drives the end surface cam profile to rotate synchronously, thereby causing the end surface cam profile to input power to the power input end of the first transmission mechanism, thereby driving the plurality of lifting mechanisms to synchronously adjust their positions, so that the plurality of vacuum tubes are switched between closing and opening synchronously and simultaneously. The vacuum tube driving device further includes: a second transmission mechanism; wherein, There are multiple end cam profiles, which are arranged in sequence along the radial direction of the cam disc from the axis to the periphery of the cam disc, and some of the end cam profiles cooperate with the power input end of the first transmission mechanism; Another part of the end cam profile is matched with the power input end of the second transmission mechanism. The second transmission mechanism is provided with a second power output end. The second power output end is connected to the corresponding pulling mechanism. When the cam disc rotates, the cam disc drives the end cam profile to rotate synchronously. Then, the end cam profile inputs power to the power input end of the second transmission mechanism matched with the end cam profile, thereby driving the pulling mechanism to adjust its position, so as to realize the switching between closing and opening of the vacuum tube. When the cam plate rotates, the first transmission mechanism and the second transmission mechanism perform staggered motion under the action of the end face cam profile, thereby driving the multiple pulling mechanisms to perform staggered position adjustment, thereby achieving staggered driving of the multiple vacuum tubes; The first transmission mechanism includes: a first roller, a double lifting lever and a support frame; wherein, The support frame is arranged on the lower support plate; The double-lifting lever is provided with a power input end, and the double-lifting lever is further provided with two power output ends located on the same side, and the power output end of the double-lifting lever is located on opposite sides of the power input end of the double-lifting lever; the double-lifting lever is rotatably arranged on the support frame at an intermediate position between the power output end and the power input end of the double-lifting lever, and the power input end of the double-lifting lever is rotatably connected to the first roller for pressing and contacting the end face cam profile line, so that when the cam disc rotates and drives the end face cam profile line to rotate synchronously, the first roller is synchronously adjusted in height with the height change of the end face cam profile line, so as to input power to the double-lifting lever, so that the double-lifting lever swings and the power output end of the double-lifting lever can simultaneously press the lifting mechanism to enable the lifting mechanism to perform synchronous vertical position adjustment; The lifting mechanism includes: a guide sleeve and a lifting rod; wherein, The guide sleeve is located between the upper support plate and the lower support plate and is mounted on the lower support plate; The lifting rod is slidably provided in the guide sleeve along the axial direction of the guide sleeve; The guide sleeve and the lifting rod are both provided with waist-shaped through holes along the axial direction, and the first power output end or the second power output end is movably inserted into the waist-shaped through holes; A waist-shaped mounting hole is further provided on the first power output end or the second power output end, and a connecting shaft is provided on the lifting rod. The connecting shaft is connected to the first power output end or the second power output end in a manner that can slide along the length direction of the waist-shaped mounting hole, and is used to drive the lifting rod to slide along the axial direction of the guide sleeve when the first power output end or the second power output end performs a circular motion; Each of the pulling mechanisms is also connected to a reset mechanism for applying a reset force to the pulling mechanism so that the pulling mechanism moves toward the upper support plate, thereby closing the vacuum tube.

2. The vacuum tube driving device according to claim 1, wherein: The end face cam profile includes: at least two protrusions spaced apart along the circumferential direction of the cam disc; wherein, A groove is formed between any two adjacent protrusions.

3. The vacuum tube driving device according to claim 2, wherein: The end wall surface of the protrusion is in a cam slope structure, and the slope of the cam slope structure is determined based on the pulling speed of the vacuum tube.

4. The vacuum tube driving device according to claim 1, wherein: The second transmission mechanism includes: a second roller, a single lifting lever and a support seat; wherein, The support seat is arranged on the lower support plate; The single-lifting lever is rotatably arranged on the support seat at an intermediate position between the power output end and the power input end of the single-lifting lever, and the power input end of the single-lifting lever is rotatably connected to the second roller, and the second roller is used to press and contact the end face cam profile. When the cam disc rotates and drives the end face cam profile to rotate synchronously, the second roller is synchronously adjusted in height with the height change of the end face cam profile to input power to the single-lifting lever, so that the single-lifting lever swings and the power output end of the single-lifting lever can press the lifting mechanism to adjust the vertical position of the lifting mechanism.

5. The vacuum tube driving device according to claim 1, wherein: The cam plate is provided with a rotating shaft for connecting to a driving motor so that the driving motor drives the cam plate to rotate.

6. An on-load tap changer, characterized in that: A vacuum tube driving device according to any one of claims 1 to 5 is provided.

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