Variable-stroke motor driving mechanism suitable for high-voltage switch

Abstract

The invention discloses a variable stroke motor driving mechanism suitable for a high-voltage switch, the variable stroke motor driving mechanism comprises a motor and a variable transmission crank arm mechanism, the variable transmission crank arm mechanism comprises a fixed seat, a telescopic crank arm, a sickle crank arm, an adjusting screw rod and an adjusting screw rod, the fixed seat is fixed on an output shaft, and a mounting hole is formed in the fixed seat; a mounting groove is formed in the hole wall of the mounting hole, the adjusting lead screw is rotationally arranged in the mounting groove in the vertical direction, and the lower end of the adjusting lead screw extends out of the fixed seat; the telescopic connecting lever is slidably arranged in the mounting hole in the vertical direction, and a rack structure used for being in threaded fit with the adjusting lead screw is correspondingly arranged on the outer side wall of the telescopic connecting lever. One end of the sickle crank arm is rotatably connected with the telescopic crank arm, and the other end is provided with a threaded hole; the adjusting screw rod is in threaded connection with the sickle crank arm through the threaded hole, and the adjusting screw rod is in threaded connection with a locking nut. According to the invention, the universality and the self-adaptive capability of the motor driving mechanism are greatly improved.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of motor driving mechanisms, and particularly relates to a variable-stroke motor driving mechanism suitable for high-voltage switches. BACKGROUND

[0002] With the development of electronic power technology and the promotion of the concept of full-state perception of power grids, the high-power motor driving mechanism suitable for high-voltage switches has been applied on a large scale in power grids due to the advantages of simple structure, stable mechanical characteristics and motion state monitoring and perception. The mechanism usually takes a crank structure as a core transmission component, rotates the crank arm through a motor, converts the angular motion of the motor into the linear opening and closing motion of the moving contact of the high-voltage switch, and combines PI control algorithm and curve design to accurately control the motion speed of the contact in different stages of the arc-extinguishing chamber, so as to meet the technical requirements of circuit interruption. However, different voltage levels and different types of circuit breakers have significant differences in the requirements for the opening and closing stroke, and the output stroke of the traditional motor driving mechanism is determined by the crank arm with a fixed rotation radius. When adapting to various stroke requirements, the mechanical structure of the transmission part needs to be repeatedly redesigned, resulting in high design complexity, increased cost and difficulty in realizing adaptive driving. Therefore, the application provides a variable-stroke motor driving mechanism suitable for high-voltage switches. SUMMARY

[0003] The application provides a variable-stroke motor driving mechanism suitable for high-voltage switches, which greatly improves the universality and adaptive ability of the motor driving mechanism.

[0004] Therefore, the application provides a variable-stroke motor driving mechanism suitable for high-voltage switches, which comprises a motor and a variable transmission crank arm mechanism connected with an output shaft of the motor.

[0005] The variable transmission crank arm mechanism comprises a fixed seat, an extension crank arm, a sickle crank arm, an adjusting lead screw and an adjusting screw.

[0006] The fixed seat is fixed on the output shaft, and a mounting hole is formed in the fixed seat.

[0007] A mounting groove is formed in the hole wall of the mounting hole.

[0008] The adjusting lead screw is arranged in the mounting groove in a vertical direction, and the lower end of the adjusting lead screw extends out of the fixed seat.

[0009] The extension crank arm is arranged in the mounting hole in a vertical direction, and a rack structure for threadedly cooperating with the adjusting lead screw is arranged on the outer side wall of the extension crank arm.

[0010] The adjusting lead screw is connected with the rack structure in a meshing manner.

[0011] One end of the sickle-shaped crank is rotationally connected with the telescopic crank, and the other end is provided with a threaded hole;

[0012] The adjusting screw is threadedly connected with the sickle-shaped crank through the threaded hole, and a locking nut is threadedly connected with the adjusting screw.

[0013] Optionally, one end of the adjusting screw away from the sickle-shaped crank is provided with a connecting ring for connecting an insulating pull rod.

[0014] Optionally, the connecting ring is connected with the movable contact through the insulating pull rod.

[0015] Optionally, the fixing seat comprises a main body structure and a limiting end cover detachably mounted at the bottom of the main body structure.

[0016] The limiting end cover is provided with a first through hole for the telescopic crank to extend out and a second through hole for the lower end of the adjusting screw to partially expose.

[0017] Optionally, the lower end of the adjusting screw is provided with a screwing part.

[0018] Optionally, the screwing part is an outer hexagonal structure.

[0019] Optionally, the limiting end cover is fixed at the bottom of the main body structure by bolts.

[0020] Optionally, the mounting slots are symmetrically provided on the hole walls on both sides of the mounting hole.

[0021] The adjusting screw is rotationally connected in each mounting slot.

[0022] The number of the rack structures is equal to the number of the adjusting screws, and they are one-to-one correspondingly arranged.

[0023] Optionally, the sickle-shaped crank is rotationally connected with the telescopic crank through a pin shaft.

[0024] Optionally, the fixing seat is located at the middle position of the output shaft.

[0025] From the above technical solution can be seen, the present application has the following advantages: the variable stroke motor drive mechanism suitable for high voltage switch is provided with the telescopic crank arm which can slide along the vertical direction and is matched with the adjusting screw rod, so that the effective rotating radius of the telescopic crank arm can be changed flexibly by rotating the adjusting screw rod, thereby realizing the adjustable output stroke of the motor drive, solving the problem that the traditional fixed crank arm needs to redesign the transmission mechanism for different strokes, and being able to adapt to circuit breaker bodies of various voltage grades and different stroke requirements; meanwhile, the sickle crank arm is connected with the movable contact through the adjusting screw rod, the distance change caused by the telescopic crank arm can be compensated by adjusting the engaging length of the adjusting screw rod, the consistency of the initial distance of the contact is ensured, the universality and operation reliability of the drive mechanism are improved, and the adaptive driving of the high voltage switch is realized. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 The front view of the variable stroke motor drive mechanism suitable for high voltage switch in the embodiment of the present application hides the motor;

[0027] Figure 2 The sectional view of the variable stroke motor drive mechanism suitable for high voltage switch in the embodiment of the present application hides the motor;

[0028] Figure 3 The connection structure diagram of the fixed seat and the output shaft in the embodiment of the present application;

[0029] Figure 4 The structure diagram of the adjusting screw rod in the embodiment of the present application;

[0030] Figure 5 The structure diagram of the telescopic crank arm in the embodiment of the present application;

[0031] Figure 6 The structure diagram of the sickle crank arm in the embodiment of the present application;

[0032] Figure 7 The structure diagram of the limiting end cover in the embodiment of the present application;

[0033] Figure 8 The use diagram of the variable stroke motor drive mechanism suitable for high voltage switch in the embodiment of the present application.

[0034] Among them, the reference signs are:

[0035] 1-output shaft, 2-fixed seat, 21-main body structure, 22-mounting hole, 23-mounting groove, 24-limiting end cover, 241-first through hole, 242-second through hole, 3-telescopic crank, 31-rack structure, 4-harvester crank, 41-threaded hole, 5-adjusting screw, 51-connection ring, 6-lock nut, 7-adjusting screw rod, 71-outer hexagonal structure, 8-pivot, 9-motor, 10-variable transmission crank mechanism, 11-insulating pull rod, 12-moving contact. DETAILED DESCRIPTION

[0036] In order to enable persons skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be described clearly and completely in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by persons skilled in the art without creative labor fall within the scope of protection of the present application.

[0037] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0038] Unless otherwise expressly specified and limited, the terms "mounting", "connecting", "connecting" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication between the two elements inside. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0039] The inventor finds that the core limitation of the prior art is the insufficient stroke adjustment capability of the transmission mechanism: on the one hand, the fixed structure of the crank arm cannot flexibly change the rotation radius, so that when the angular rotation of the motor is converted into the linear motion of the contact, there is a lack of elastic mechanism to adapt to different strokes, and forced adaptation may cause problems such as transmission efficiency reduction and motion accuracy deviation, which seriously affect the arc extinguishing performance of the switch; on the other hand, the difference in the motion stroke of different circuit breaker bodies requires frequent adjustment of the transmission mechanism, and the traditional design does not consider the influence of the extension and retraction of the crank arm on the initial distance of the moving contact, which may cause deviations in the contact pressure and synchronization of the mechanical characteristics when the contact is closed, further limiting the universality of the drive mechanism. In addition, even if the existing scheme optimizes the opening and closing characteristics through a control algorithm, it is still limited by the fixedness of the mechanical structure and cannot escape the technical dilemma of designing a dedicated drive mechanism for different stroke circuit breakers.

[0040] The present application provides one embodiment of a variable stroke motor drive mechanism suitable for high voltage switches, please refer to Figures 1 to 6 .

[0041] The variable stroke motor drive mechanism suitable for high voltage switches in the embodiment includes a motor 9 and a variable transmission crank arm mechanism 10 connected to the output shaft 1 of the motor 9, the variable transmission crank arm mechanism 10 includes a fixed seat 2, a telescopic crank arm 3, a sickle crank arm 4, an adjusting lead screw 7 and an adjusting screw rod 5, the fixed seat 2 is fixed on the output shaft 1, and a mounting hole 22 is formed in the fixed seat 2, a mounting groove 23 is formed in the hole wall of the mounting hole 22, the adjusting lead screw 7 is vertically arranged in the mounting groove 23, and the lower end of the adjusting lead screw 7 extends out of the fixed seat 2; the telescopic crank arm 3 is vertically arranged in the mounting hole 22, and a rack structure 31 for threadedly engaging with the adjusting lead screw 7 is correspondingly arranged on the outer side wall of the telescopic crank arm 3; the adjusting lead screw 7 is in meshing connection with the rack structure 31; one end of the sickle crank arm 4 is in rotational connection with the telescopic crank arm 3, and the other end is provided with a threaded hole 41; the adjusting screw rod 5 is in threaded connection with the sickle crank arm 4 through the threaded hole 41, and a locking nut 6 is in threaded connection with the adjusting screw rod 5.

[0042] It should be noted that the variable stroke motor drive mechanism suitable for high voltage switches is provided with the telescopic crank arm 3 which can slide in the vertical direction and threadedly engage with the adjusting lead screw 7, so that the effective rotation radius of the telescopic crank arm 3 can be flexibly changed by rotating the adjusting lead screw 7, thereby realizing the adjustable output stroke of the motor 9, solving the problem that the traditional fixed crank arm needs to redesign the transmission mechanism for different strokes, and being able to adapt to circuit breaker bodies of various voltage grades and different stroke requirements; at the same time, the sickle crank arm 4 is connected with the moving contact 12 through the adjusting screw rod 5, the distance change caused by the extension and retraction of the telescopic crank arm 3 can be compensated by adjusting the meshing length of the screw rod, the consistency of the initial distance of the contact is ensured, the universality and operation reliability of the drive mechanism are improved, and adaptive driving of the high voltage switch is realized.

[0043] The above is an embodiment of the variable stroke motor driving mechanism suitable for a high-voltage switch provided by the present application. The following is an embodiment of the variable stroke motor driving mechanism suitable for a high-voltage switch provided by the present application. For details, please refer to Figures 1 to 8 .

[0044] The variable stroke motor driving mechanism suitable for a high-voltage switch in the present embodiment comprises a motor 9 and a variable transmission crank arm mechanism 10 connected to the output shaft 1 of the motor 9. The variable transmission crank arm mechanism 10 comprises a fixed seat 2, an extension crank arm 3, a sickle crank arm 4, an adjusting lead screw 7, and an adjusting screw rod 5. The fixed seat 2 is fixed on the output shaft 1, and a mounting hole 22 is formed in the fixed seat 2. A mounting groove 23 is formed in the hole wall of the mounting hole 22. The adjusting lead screw 7 is arranged in the mounting groove 23 in the vertical direction, and the lower end of the adjusting lead screw 7 extends out of the fixed seat 2. The extension crank arm 3 is arranged in the mounting hole 22 in the vertical direction, and a rack structure 31 for threadedly cooperating with the adjusting lead screw 7 is correspondingly arranged on the outer side wall of the extension crank arm 3. The adjusting lead screw 7 is meshingly connected with the rack structure 31. One end of the sickle crank arm 4 is rotatably connected with the extension crank arm 3, and the other end of the sickle crank arm 4 is provided with a threaded hole 41. The adjusting screw rod 5 is threadedly connected with the sickle crank arm 4 through the threaded hole 41, and a locking nut 6 is threadedly connected with the adjusting screw rod 5.

[0045] It can be understood that the extension crank arm 3 can be slid up and down by rotating the adjusting lead screw 7 to adjust the rotation radius of the extension crank arm 3, thereby adjusting the driving output stroke of the motor 9. At the same time, the adjusting lead screw 7 and the extension crank arm 3 are affected by the thread pressure angle, forming a one-way transmission, so that the extension crank arm 3 will not change in length due to rotation swing. At the same time, in order to avoid the change of the initial position of the movable contact 12 caused by the extension and retraction of the extension crank arm 3, the engagement length of the adjusting screw rod 5 can be adjusted (the extension length of the adjusting screw rod 5 is adjusted by rotating the adjusting screw rod 5, and after adjustment, the locking nut 6 can be used for fixation), so as to ensure the length of the insulating pull rod 11 matching different extension lengths, thereby ensuring the consistency of the initial distance of the contact. The variable stroke motor driving mechanism suitable for a high-voltage switch adjusts the rotation radius of the extension crank arm 3 and the extension length of the adjusting screw rod 5 to compensate for the adaptive ability of the motor driving mechanism, so as to avoid the need to redesign the motor driving transmission structure due to different movement strokes of different high-voltage switches, and greatly improves the active adaptability of the motor driving mechanism.

[0046] The end of the adjusting screw rod 5 away from the sickle crank arm 4 is provided with a connecting ring 51 for connecting the insulating pull rod 11. The connecting ring 51 is connected with the movable contact 12 through the insulating pull rod 11.

[0047] The fixed seat 2 comprises a main body structure 21 and a limiting end cover 24 detachably mounted at the bottom of the main body structure 21, the limiting end cover 24 is provided with a first through hole 241 for the extension of the telescopic crank arm 3 and a second through hole 242 for the exposure of the lower end part of the adjusting screw rod 7.

[0048] The lower end of the adjusting screw rod 7 is provided with a screw part. Specifically, the screw part can be an outer hexagonal structure 71.

[0049] Specifically, the limiting end cover 24 is fixed on the bottom of the main body structure 21 by bolts, and the limiting end cover 24 is used to axially fix the adjusting screw rod 7.

[0050] The mounting holes 22 are symmetrically provided with mounting grooves 23 on the hole walls on both sides, and the adjusting screw rod 7 is rotatably connected in each mounting groove 23. The number of the rack structures 31 is equal to the number of the adjusting screw rods 7, and they are arranged one by one.

[0051] Specifically, the sickle crank arm 4 is rotatably connected with the telescopic crank arm 3 through the pin shaft 8.

[0052] Preferably, the fixed seat 2 is located at the middle position of the output shaft 1.

[0053] In specific implementation, the motor 9 serves as a driving unit to drive the rotation of the fixed seat 2, thereby driving the rotation of the telescopic crank arm 3 and the movement of the sickle crank arm 4, and further realizing the opening and closing actions of the high-voltage switch through the to-and-fro movement of the moving contact 12. In different high-voltage switch devices, the moving stroke of the moving contact 12 is different, and the extension distance of the insulating pull rod 11 out of the high-voltage switch end cover is different. The variable stroke motor driving mechanism suitable for the high-voltage switch realizes the variable stroke size of the moving contact 12 and the matching extension length of the insulating pull rod 11 by changing the part structure form and function of the fixed seat 2, the telescopic crank arm 3 and the sickle crank arm 4, and realizes the matching of the motor driving mechanism and the high-voltage switch.

[0054] In order to realize the variable length adjustment of the motor 9 output stroke, the telescopic crank arm 3 is adjusted up and down by rotating the adjusting screw rod 7, so that the rotation radius of the motor output crank arm changes. At the same time, in order to ensure that the initial distance between the center of the motor output rod and the output end rod of the high-voltage switch remains consistent, and to avoid adding other transition devices to compensate for the distance deviation, the coupling length of the adjusting screw rod 5 and the sickle crank arm 4 is adjusted, and the locking nut 6 is used for fixation. Thus, the variable adjustment function of the motor driving mechanism coupling different high-voltage switches with different strokes is realized.

[0055] The above-described embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacements for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A variable stroke motor drive mechanism suitable for a high voltage switch, characterized in that: include: a motor and a variable transmission crank arm mechanism connected to an output shaft of the motor; The variable transmission crank arm mechanism includes a fixed seat, a telescopic crank arm, a sickle crank arm, an adjustment lead screw and an adjustment screw; The fixing seat is fixed on the output shaft, and a mounting hole is provided on the fixing seat; A mounting groove is provided on the hole wall of the mounting hole; The adjusting screw rod is arranged in the mounting groove and rotates in the vertical direction, and the lower end of the adjusting screw rod extends out of the fixing seat; The telescopic crank arm is slidably arranged in the mounting hole along the vertical direction, and a rack structure for engaging with the adjusting screw thread is correspondingly arranged on the outer side wall of the telescopic crank arm; The adjusting screw is meshedly connected with the rack structure; One end of the sickle crank arm is rotatably connected to the telescopic crank arm, and the other end is provided with a threaded hole; The adjusting screw is threadedly connected to the sickle arm through the threaded hole, and a locking nut is threadedly connected to the adjusting screw.

2. The variable stroke motor drive mechanism for a high voltage switch according to claim 1, characterized in that: One end of the adjusting screw away from the sickle arm is provided with a connecting ring for connecting to an insulating pull rod.

3. The variable stroke motor drive mechanism for a high voltage switch according to claim 2, characterized in that: The connecting ring is connected to the moving contact through the insulating pull rod.

4. The variable stroke motor drive mechanism for a high voltage switch according to claim 1, characterized in that: The fixing seat includes a main structure and a limiting end cover detachably mounted on the bottom of the main structure; The limiting end cover is provided with a first through hole for extending the telescopic crank arm and a second through hole for exposing the lower end portion of the adjusting screw rod.

5. The variable stroke motor drive mechanism for a high voltage switch according to claim 1, characterized in that: The lower end of the adjusting screw rod is provided with a screwing portion.

6. The variable stroke motor drive mechanism for a high voltage switch according to claim 5, characterized in that: The screwing portion is an external hexagonal structure.

7. The variable stroke motor drive mechanism for a high voltage switch according to claim 4, characterized in that: The limiting end cover is fixed to the bottom of the main structure by bolts.

8. The variable stroke motor drive mechanism for a high voltage switch according to claim 1, characterized in that: The mounting grooves are symmetrically provided on the hole walls on both sides of the mounting hole; The adjusting screw is rotatably connected in each of the mounting slots; The number of the rack structures is equal to the number of the adjusting screw rods and they are arranged in a one-to-one correspondence.

9. The variable stroke motor drive mechanism for a high voltage switch according to claim 1, characterized in that: The sickle crank arm is rotatably connected to the telescopic crank arm through a pin shaft.

10. The variable stroke motor drive mechanism for a high voltage switch according to claim 1, characterized in that: The fixing seat is located in the middle of the output shaft.

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