Off-circuit tap-changer gear transmission mechanism

Abstract

The utility model provides a gear transmission mechanism of an off-circuit tap-changer. The gear transmission mechanism comprises a shell, a horizontal input shaft, a vertical output shaft, a large spiral gear, a supporting plate, a hollow sleeve shaft, a small spiral gear, a slot shifting piece, a small gear shaft, a small gear, a grooved wheel shaft, a grooved wheel and a large gear, the large spiral gear is fixed on the horizontal input shaft; the supporting plate is fixed in the shell; the hollow sleeve shaft is rotationally mounted in the shell; the small spiral gear is fixed on the hollow sleeve shaft and is meshed with the large spiral gear; the slot shifting piece is fixed on the hollow sleeve shaft; the pinion shaft is movably sleeved in the hollow sleeve shaft and is in transmission fit with the upper end of the vertical output shaft; the pinion is fixed on the pinion shaft; the grooved wheel shaft is rotationally installed in the shell. The grooved wheel is fixed on the grooved wheel shaft; and the bull gear is fixed on the grooved wheel shaft and is meshed with the pinion. The gear transmission mechanism is normalized in assembly requirement, convenient to produce in batches, stable and reliable in performance and not prone to being stuck, and the comprehensive performance of products is effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of off-excitation tap changers, in particular to a gear transmission mechanism of an off-excitation tap changer. Background Art

[0002] The publication number is: CN104465155A, and the name is: A specific implementation of the Chinese invention patent for a moving contact that changes to an off-excitation tap-changer after force relief. It provides a drum-type off-excitation tap-changer with a superior performance in force relief moving contact system for distribution transformers. At present, this drum-type off-excitation tap-changer has become one of the mainstream products due to its superior performance. It is widely used in power transformers and traction transformers, playing an important role in power grids and railway traction distribution.

[0003] Drum-type off-circuit tapchangers with a force-relief moving contact system have specific input drive torque requirements, with input angles of 300°, 315°, and 324° (corresponding to 5, 7, and 9 gears). The gear operating mechanism disclosed in Chinese Utility Model Patent Publication No. CN204577268U, entitled "Gear Operating Mechanism for Off-Circuit Drum Tapchangers," has long been used as a supporting mechanism for these systems. This gear operating mechanism utilizes an incomplete bevel gear transmission in conjunction with a plate positioning mechanism to achieve output angles of 300°, 315°, and 324°. This gear transmission mechanism, employing an incomplete bevel gear transmission in conjunction with a plate positioning mechanism, inherently suffers from the common drawbacks of incomplete gear transmissions (i.e., the first or last teeth of the incomplete gear may need to be ground during assembly and adjustment). Furthermore, the positioning plate requires extremely high clearance adjustment (approximately 0.1mm). Otherwise, the incomplete bevel gear cannot be properly coordinated, resulting in the positioning plate and the incomplete bevel gear becoming stuck. This kind of assembly requirement is difficult to achieve in factory mass production and is prone to assembly quality problems.

[0004] However, as the number of existing drum-type off-excitation tap-changers with unloading force moving contact systems increases, the number of gear transmission mechanisms that cooperate with each other incomplete bevel gear transmission and flat plate positioning also increases. As a result, mass production efficiency is low and it is easy to get stuck. Therefore, it is necessary to develop a new gear transmission mechanism that can effectively solve the above problems and is compatible with the drum-type off-excitation tap-changer with unloading force moving contact system. Utility Model Content

[0005] In order to solve the above problems, the purpose of the present invention is to provide a gear transmission mechanism for an off-excitation tap changer, which can be matched with a drum-type off-excitation tap changer with a force-removing moving contact system, thereby solving the problems of low batch production efficiency and easy jamming in the existing gear transmission mechanism in which an incomplete bevel gear transmission and a flat plate positioning are coordinated with each other, thereby improving the overall performance of the product.

[0006] The purpose of the utility model is achieved through the following technical solutions:

[0007] A gear transmission mechanism for an off-excitation tap changer comprises a hollow housing; a horizontal input shaft capable of rotating within the housing is transversely arranged within the housing, one end of the horizontal input shaft extending outside the housing as a transmission input end; a vertical output shaft capable of rotating within the housing is vertically arranged on the lower side of the interior of the housing, the lower end of the vertical output shaft extending outside the housing as a transmission output end; a large helical gear, a support plate, a hollow sleeve shaft, a small helical gear, a slotting member, a small gear shaft, a small gear, a sheave shaft, a sheave and a large gear are also arranged within the housing; the large helical gear is fixed on the horizontal input shaft; the support plate is fixed within the housing; the hollow sleeve shaft is a vertical and rotatable shaft mounted between the inner wall of the housing and the support plate The hollow shaft on it; the small helical gear is fixed on the hollow sleeve shaft and meshes with the large helical gear, and the large helical gear converts its own horizontal axis rotation into the vertical axis rotation of the small helical gear; the groove member is fixed on the hollow sleeve shaft; the pinion shaft is movably sleeved in the hollow sleeve shaft, and its lower end is transmission-matched with the upper end of the vertical output shaft, and its upper end extends out of the hollow sleeve shaft; the pinion gear is fixed on the protruding part of the upper end of the pinion gear shaft; the groove wheel shaft is vertically and rotatably mounted on the inner wall of the shell and the support plate; the groove wheel is fixed on the groove wheel shaft and can cooperate with the groove member to convert the circumferential rotation motion of the groove member into intermittent rotation of the groove wheel; the large gear is fixed on the groove wheel shaft and meshes with the pinion gear.

[0008] Furthermore, the support plate is located above the horizontal input shaft and the vertical output shaft, serving as a supporting carrier, and the large helical gear and the small helical gear are located below the support plate; the slot member, the small gear, the sheave and the large gear are all located above the support plate.

[0009] Furthermore, a locking circle and a roller are provided on the shifting member; a plurality of shifting grooves cooperating with the rollers are evenly distributed on the outer circumference of the groove wheel, and an arc groove cooperating with the locking circle is provided between adjacent shifting grooves; when the shifting member rotates one circle, the roller is stuck in the shifting groove and drives the groove wheel to rotate once and then leaves the shifting groove, and the locking circle re-enters the arc groove.

[0010] Furthermore, the sheave adopts a 90° gap rotating sheave, and four shifting grooves and an arc groove are evenly distributed on the outer circumference of the sheave; when the shifting groove member rotates one circle, the roller is stuck in the shifting groove and shifts the sheave wheel 90° and then leaves the shifting groove, and the locking circle re-enters the arc groove.

[0011] Further, when the large helical gear rotates 360° (one circle), the small helical gear rotates 720° (two circles).

[0012] Further, in order to prevent the horizontal input shaft from rotating randomly during installation and transportation, the gear transmission mechanism of the off-circuit tap-changer further includes a positioning member; one end of the positioning member is detachably connected to the housing, and the other end is detachably connected to the transmission input end of the horizontal input shaft.

[0013] Further, the gear transmission mechanism of the off-circuit tap-changer further includes a pointer and a position-in-place indicator plate for jointly indicating whether the current stop position of the horizontal input shaft is correct; the pointer is fixed at a preset position of the horizontal input shaft by screws and rotates synchronously with the horizontal input shaft; the position-in-place indicator plate is fixed at a preset position on the housing and corresponds to the position of the pointer, and an indication mark for cooperating with the pointer to indicate whether the stop position of the horizontal input shaft is correct is provided on its surface.

[0014] Further, the indication mark includes a green area indicating that the pointer and the stop position of the horizontal input shaft are correct, a red area indicating that the pointer and the stop position of the horizontal input shaft are incorrect, a rotation direction arrow indicating the rotation direction of the pointer and the horizontal input shaft, and a text description.

[0015] Further, for the convenience of installation and maintenance, the top of the housing is open, and a lid is detachably covered at the opening. At the same time, for the convenience of observing the gear position, an observation window is provided on the lid. The observation window is sealed with a glass sheet, and a sealing ring is provided at the connection between the glass sheet and the lid; a gear position plate is provided on the small gear, and gear position numbers are set on the gear position plate. When the gear position plate rotates with the small gear, the gear position numbers thereon pass directly below the observation window in sequence; at the same time, at least one arrow indicating the gear position in red is uniformly provided on the upper surface of the large gear, and the arrow rotates with the large gear and passes directly below the observation window in sequence.

[0016] Further, to protect the observation window, a transparent rain shield that covers and can be opened is provided on the lid above the observation window. The rain shield is made of transparent material, and the indication relationship between the gear position numbers and the arrow can be directly observed, so as to determine the gear position.

[0017] The utility model adopts the coordinated movement of helical gears, grooved wheels, gears, etc., which can flip the horizontal input shaft and the vertical output shaft by 90°, and can convert the rotation of one input circle into precise 300°, 315°, and 324° rotation angle outputs. The rotation angle of one input circle can have a deviation of plus or minus 60°, which can fully meet the needs of the drum-type de-excitation tap changer of the unloading force moving contact system. The coordinated movement of traditional helical gears, grooved wheels, gears, etc. is adopted to normalize its assembly requirements, facilitate mass production, and has stable and reliable performance, is not easy to get stuck, and effectively improves the overall performance of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The solution of the utility model is further described in detail below with reference to the accompanying drawings.

[0019] Figure 1 This is a front view of the gear transmission mechanism of the off-excitation tap changer of the utility model.

[0020] Figure 2 for Figure 1 Full cross-section of .

[0021] Figure 3 for Figure 1 Cross-sectional view along the AA direction.

[0022] Figure 4 This is a top view of the gear transmission mechanism of the off-excitation tap changer of the present invention.

[0023] Figure 5 It is a right side view of the gear transmission mechanism of the off-excitation tap changer described in the present invention.

[0024] Figure 6 This is a positional relationship diagram of the small gear and the large gear described in the present invention.

[0025] Figure 7 This is a diagram showing the position relationship between the gear position plate and the large gear described in the present invention.

[0026] Figure 8 This is a positional relationship diagram of the groove shifting member and the groove wheel of the utility model.

[0027] Shown in the figure: 1-housing, 2-grooved wheel shaft, 3-positioning part, 4-pointer, 5-in-place indicator, 6-support plate, 7-grooved wheel, 71-slot, 72-arc groove, 8-large gear, 9-cover, 10-observation window, 11-gear position plate, 12-small gear, 13-small gear shaft, 14-hollow sleeve shaft, 15-slot part, 151-lock circle, 152-roller, 16-small helical gear, 17-horizontal input shaft, 18-large helical gear, 19-vertical output shaft, 20-rain cover. DETAILED DESCRIPTION

[0028] The following specific embodiments illustrate the implementation manners of the present utility model. Those skilled in the art can easily understand other advantages and effects of the present utility model from the content disclosed in this specification. The described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without making creative efforts belong to the scope protected by the present utility model.

[0029] It should be noted that the structures, ratios, sizes, etc. shown in the drawings of this specification are only used to cooperate with the content disclosed in the specification for those skilled in the art to understand and read, and are not used to limit the limited conditions under which the present utility model can be implemented. Therefore, they do not have any technical essence. Any modification of the structure, change of the proportional relationship or adjustment of the size, without affecting the effects that the present utility model can produce and the purposes that can be achieved, should still fall within the scope covered by the technical content disclosed by the present utility model. At the same time, the terms such as "upper", "lower", "left", "right", "middle", etc. cited in this specification are only for the convenience of description and are not used to limit the scope under which the present utility model can be implemented. The change or adjustment of their relative relationships, without substantial change of the technical content, should also be regarded as the scope under which the present utility model can be implemented.

[0030] In the description of the present utility model, it should be noted that unless otherwise clearly specified and limited, the terms "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations. Embodiment 1

[0031] As Figures 1 to 8 shown, this embodiment provides a gear transmission mechanism for a non-excitation tap-changer, including a housing 1, a horizontal input shaft 17, a vertical output shaft 19, and a large helical gear 18, a support plate 6, a hollow sleeve shaft 14, a small helical gear 16, a groove member 15, a pinion shaft 13, a pinion 12, a sprocket shaft 2, a sprocket 7, and a large gear 8 respectively arranged in the housing 1. By using relatively traditional helical gears, sprockets, gears, etc. to cooperate in motion, a 360° rotation angle of the horizontal input is achieved, and 300°, 315°, and 324° rotation angles are accurately output vertically. And the 360° rotation angle of the input can have a deviation of plus or minus 60°, which can fully meet the requirements of the drum-type non-excitation tap-changer for the unloading and loading moving contact system.

[0032] The interior of the housing 1 is hollow and serves as the load-bearing body. On each of the left and right sides of the housing 1, a coaxial through-hole is provided for installing the horizontal input shaft 17; a through-hole is provided at the lower part of the housing 1 for installing the vertical output shaft 19; a counterbore is provided at the bottom of the inner cavity of the housing 1 for bearing and positioning the grooved pulley shaft 2; on each of the left and right sides of the inner cavity of the housing 1, a boss is provided above the horizontal input shaft 17, and screw holes are provided in the boss for installing and fixing the support plate 6.

[0033] The horizontal input shaft 17 is a conventional rotating shaft, on which key grooves, snap ring grooves, screw holes, a coupling end ball head and through-holes are provided. The horizontal input shaft 17 is horizontally arranged in the through-holes preset on the left and right sides of the housing 1 through bearings and snap rings and can rotate. One end of the horizontal input shaft 17 extends outside the housing 1 as the transmission input end, and a coupling end ball head and a through-hole are provided at this end; the function of the horizontal input shaft 17 is to connect to an external transmission shaft through the coupling end ball head and the through-hole, receive external transmission input, and drive the large helical gear 18 to rotate.

[0034] The vertical output shaft 19 is a conventional rotating shaft, with a groove provided at its upper end and a flat surface provided at its lower end, and a snap ring groove is provided on its outer circle. The vertical output shaft 19 is vertically and rotatably installed in the through-hole preset on the lower side inside the housing through bearings and snap rings. The lower end of the vertical output shaft 19 extends outside the housing 1 as the transmission output end, and its transmission output end is connected to the drum-type non-excited tap-changer of the unloading and adding force moving contact system.

[0035] The large helical gear 18 is a conventional helical gear, and is installed and fixed at a preset position in the middle of the horizontal input shaft 17 through a key groove and a snap ring, and rotates synchronously with the horizontal input shaft 17. The function of the large helical gear 18 is to change the rotation of its own horizontal shaft into the rotation of the vertical shaft of the small helical gear 16.

[0036] The support plate 6 is a flat part located above the horizontal input shaft 17 and the vertical output shaft 19, which plays a role in supporting and fixing. Installation and fixing holes are provided on both sides of it, and two bearing holes for installing the hollow sleeve shaft 14 and the grooved pulley shaft 2 respectively are provided in the middle. The support plate 6 is installed at a preset position on the housing 1 through the fixing holes on both sides of it and the corresponding installation threaded holes on the housing 1.

[0037] The hollow sleeve shaft 14 is a vertically arranged hollow shaft. Key grooves and snap ring grooves are provided on the outer circle surface of the hollow sleeve shaft 14, counterbores are provided at both ends of its inner cavity, and its upper part extends above the support plate 6. The hollow sleeve shaft 14 is vertically and rotatably installed at preset positions on the housing 1 and the support plate 6, and its function is to transmit the rotation of the small helical gear 16 to the grooved part 15.

[0038] The small helical gear 16 is a conventional helical gear located below the support plate 6. It is mounted and fixed to a predetermined position on the hollow sleeve shaft 14 via a keyway and a retaining ring. It meshes with the large helical gear 18. The large helical gear 18 converts its horizontal rotation into vertical rotation for the small helical gear 16. The function of the small helical gear 16 is to convert the horizontal rotation of the large helical gear 18 into its own vertical rotation and transmit this rotation to the hollow sleeve shaft 14. When the large helical gear 18 rotates 360° (one revolution), the small helical gear 16 rotates 720° (two revolutions).

[0039] The groove member 15 is a circular disc-shaped part arranged above the support plate 6. Figure 8 As shown, the shifting member 15 is configured with a locking circle 151 and a roller 152. The outer surface of the locking circle 151 is an arcuate surface (three-quarters of the outer surface of the locking circle 151 is a convex arc that mates with the arcuate groove 72 of the sheave 7, and the other quarter is a concave arc). The roller is located on the other side of the locking circle 151 (the side with the concave arc) and intermittently shifts the sheave 7 as the shifting member 15 rotates. The shifting member 15 is fixed to a predetermined position on the upper end of the hollow sleeve 14 (above the support plate) via a key and a retaining ring. The function of the shifting member 15 is to rotate with the hollow sleeve 14, converting its own circular rotation into intermittent 90° rotation of the sheave 7.

[0040] The pinion shaft 13 is provided with a keyway and a retaining ring groove at its upper end, and a flat surface at its lower end. Pinion shaft 13 is movably mounted within a predetermined position within the interior of the hollow sleeve shaft 14 via a bearing and retaining ring. The flat surface at its lower end engages with (meshes with) a groove at the upper end of the vertical output shaft 19, and the upper end of the pinion shaft 13 extends outside the hollow sleeve shaft 14. The function of pinion shaft 13 is to transmit the rotational motion of the pinion gear 12 to the vertical output shaft 19, enabling the vertical output shaft 19 to achieve rotational torques of 300°, 315°, and 324°.

[0041] The pinion 12 is a common spur gear arranged above the shifting member 15, and is fixed to a preset position on the protruding portion of the upper end of the pinion shaft 13 by a keyway and a retaining ring. The pinion 12 meshes with the large gear 8, converting the two 90° (a total of 180°) intermittent rotations of the large gear 8 into its own 300°, 315°, and 324° rotations, and driving the pinion shaft 13 to rotate synchronously.

[0042] The sheave shaft 2 is provided with a keyway and a retaining ring groove as a carrier for the sheave 7 and the gear 8. The sheave shaft 2 is vertically and rotatably mounted on a preset position of the housing 1 and the support plate 6 through a bearing and a retaining ring.

[0043] The sheave 7 is fixed to a preset position of the sheave shaft 2 by a keyway and a retaining ring and can cooperate with the shifting member 15 to convert the circumferential rotation of the shifting member 15 into intermittent rotation of the sheave 7. The sheave 7 is located above the support plate 6; four shifting grooves 71 are evenly distributed on the outer circumference of the sheave 7 and cooperate with the rollers 152. At the same time, arcuate grooves 72 that cooperate with the locking circular surface (arc-shaped convex surface) of the locking circle 151 are provided between adjacent shifting grooves 71 (there are also four arcuate grooves 72. When the arcuate convex surface of the locking circle 151 contacts the arcuate grooves 72, the shifting member 15 rotates, and the sheave 7 does not rotate), that is, the sheave 7 adopts a 90° gap rotating sheave; when the shifting member 15 rotates one circle, the roller 152 is engaged in the shifting groove 71 and shifts the sheave 7 90° and then leaves the shifting groove 71, and the arcuate convex surface of the locking circle 151 re-enters the arcuate groove 72.

[0044] The large gear 8 is a conventional spur gear positioned above the sheave 7. It is secured to a predetermined position on the sheave shaft 2 via a keyway and retaining ring, and meshes with the pinion 12. Sharing a keyway with the sheave 7, large gear 8 rotates synchronously with the sheave 7, then transmits its rotation to the pinion 12 through meshing with the pinion 12. By shifting the gear ratio, the intermittent rotation of large gear 8, in two steps of 90° (a total of 180°), is converted into rotations of 300°, 315°, and 324°, respectively, by the pinion 12.

[0045] Working principle:

[0046] The external transmission shaft is connected to the horizontal input shaft 17 through a coupling, driving the horizontal input shaft 17 to rotate 360° for one gear position, and the horizontal input shaft 17 drives the large helical gear 18 to rotate 360°. The large helical gear 18 meshes with the small helical gear 16, converting one full rotation (360°) of the horizontal axis of the large helical gear 18 into two full rotations (720°) of the vertical axis of the small helical gear 16. The small helical gear 16 simultaneously drives the hollow sleeve shaft 14 to rotate vertically two full rotations and drives the grooved part 15 to rotate vertically two full rotations. The grooved part 15 meshes with the Geneva wheel 7, converting two full rotations of the vertical rotation of the grooved part 15 into a 180° vertical progressive rotation of the Geneva wheel 7. The Geneva wheel 7 and the large gear 8 are jointly fixed on the Geneva wheel shaft 2, and the three rotate synchronously. Therefore, the large gear 8 follows the Geneva wheel 7 to rotate vertically and progressively 180°. The large gear 8 meshes with the small gear 12, converting the 180° vertical progressive rotation of the large gear 8 into a 300° vertical rotation of the small gear (by changing the transmission ratio between the large gear 8 and the small gear 12, different angles such as 315° and 324° of the vertical rotation of the small gear can be achieved). The small gear 12 is fixed on the small gear shaft 13, driving the small gear shaft 13 to rotate vertically 300°, 315°, or 324°. The flat surface of the small gear shaft 13 meshes with the groove of the vertical output shaft 19, driving the vertical output shaft 19 to rotate vertically 300°, 315°, or 324°. The flat surface at the lower end of the vertical output shaft 19 drives the drum-type non-excited tap-changer of the unloading and adding force moving contact system to shift gears, meeting the input torque requirements of the drum-type non-excited tap-changer of the unloading and adding force moving contact system.

[0047] The descriptions of the output rotation angles of 300°, 315°, and 324° in the above full text do not mean that a single embodiment can achieve rotation angles of 300°, 315°, and 324°. Instead, the gear mechanism corresponding to the 5th gear has an output rotation angle of 300°, the gear mechanism corresponding to the 7th gear has an output rotation angle of 315°, and the gear mechanism corresponding to the 7th gear has an output rotation angle of 324°. At the same time, by changing the gear transmission parameters of the small gear 12 and the large gear 8 in this embodiment, gear mechanisms with more gears such as the 11th gear and the 13th gear can be achieved. Embodiment 2

[0048] The difference between this embodiment and Embodiment 1 is as follows:

[0049] For ease of installation and maintenance, the top of the housing 1 is open, and a flat lid 9 is detachably covered at the opening through screws. The outer shape of the lid 9 is the same as that of the housing 1, enclosing the housing 1. Embodiment 3

[0050] The difference between this embodiment and Embodiment 2 is as follows:

[0051] For easy observation of the gear position, an observation window 10 is provided on the lid 9. The observation window 10 is sealed with a glass sheet, and a sealing ring is provided at the connection between the glass sheet and the lid. A circular plate-shaped gear position sign 11 is provided on the pinion 12. The gear position sign 11 is fixed to the pinion 12 by small screws and rotates with the pinion 12. Gear position numbers are set on the gear position sign 11. When the gear position sign 11 rotates with the pinion 12, the gear position numbers on it pass directly below the observation window 10 in sequence. At the same time, four red arrows for indicating the gear position are evenly arranged on the upper surface of the large gear 8. The arrows rotate with the large gear 8 and pass directly below the observation window 10 in sequence. When any one of the gear position numbers on the gear position sign 11 passes directly below the observation window 10, exactly one arrow also rotates with the large gear 8 to directly below the observation window 10.

[0052] In this embodiment, the gear position sign 11 rotates vertically by 300°, 315°, and 324° following the pinion 12. Thus, the gear position numbers on the gear position sign 11 also rotate and are coupled and marked with the red arrows on the upper plane of the large gear 8 at the same time. When the red arrows on the upper plane of the large gear 8 are aligned with the gear position number codes on the gear position sign 11, the codes represent the current gear position. Embodiment 4

[0053] The difference between this embodiment and Embodiment 3 is as follows:

[0054] To protect the observation window 10, a transparent rain shield 20 that covers and can be opened is provided on the lid above the observation window 10. The rain shield 20 is made of transparent material, and the indication relationship between the gear position numbers and the arrows can be observed without opening it, so as to determine the gear position. Embodiment 5

[0055] The difference between this embodiment and any one of Embodiments 1 - 4 is as follows:

[0056] As Figure 5 shown, the non-excitation tap-changer gear transmission mechanism further includes a pointer 4 and a position-in-place indicator plate 5 for jointly indicating whether the current horizontal input shaft stop position is correct. The pointer 4 is fixed to a preset position of the horizontal input shaft 17 by screws and rotates synchronously with the horizontal input shaft 17. The position-in-place indicator plate 5 is fixed to a preset position on the housing 1 and corresponds to the position of the pointer 4. An indication mark for cooperating with the pointer 4 to indicate whether the horizontal input shaft 17 stop position is correct is provided on its surface. The indication mark includes a green area indicating that the pointer 4 and the horizontal input shaft 17 stop position are correct, a red area indicating that the pointer 4 and the horizontal input shaft 17 stop position are incorrect, a rotation direction arrow indicating the rotation direction of the pointer 4 and the horizontal input shaft 17, and a text description.

[0057] In this embodiment, the pointer 4 is fixed at a preset position on the horizontal input shaft 17 and rotates synchronously with the horizontal input shaft 17. The pointer 4 rotates on the surface dial of the in-place indicator board 5. When the pointer 4 indicates the green area of the in-place indicator board 5, it means the allowed stop position. When the pointer 4 indicates the red area of the in-place indicator board 5, it means the warning position. The horizontal input shaft is not allowed to stop in the red area and the area of the part itself. Embodiment 6

[0058] The difference between this embodiment and any one of Embodiments 1-5 lies in that:

[0059] In order to prevent the horizontal input shaft from rotating randomly during installation and transportation, the non-excited tap-changer gear transmission mechanism further includes a positioning member 3, which is used as a disposable part. One end of the positioning member 3 is detachably connected (by screw connection) to the housing 1, and the other end is detachably connected (by tying with a nylon tie) to the transmission input end of the horizontal input shaft 17 to prevent it from rotating randomly during installation and transportation.

[0060] Other details not elaborated in the present utility model are all well-known conventional techniques in the art.

[0061] It should be noted that the term "comprising", "including" or any other variation is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements but also includes other elements not explicitly listed, or further includes elements inherent to such process, method, article or device.

[0062] The protection scope of the present utility model is not limited to the technical solutions disclosed in the specific embodiments. Any modification, equivalent replacement, improvement, etc. made to the above embodiments based on the technical essence of the present utility model shall fall within the protection scope of the present utility model.

Claims

1. A gear transmission mechanism for an off-circuit tap-changer, comprising a hollow housing; a horizontal input shaft is transversely arranged in the housing and can rotate in the housing, and one end of the horizontal input shaft extends out of the housing as a transmission input end; a vertical output shaft is vertically arranged at the lower side inside the housing and can rotate in the housing, and the lower end of the vertical output shaft extends out of the housing as a transmission output end; it is characterized in that: A large helical gear, a support plate, a hollow sleeve shaft, a small helical gear, a groove member, a small gear shaft, a small gear, a sprocket shaft, a sprocket and a large gear are further provided in the housing; the large helical gear is fixed on the horizontal input shaft; the support plate is fixed in the housing; the hollow sleeve shaft is a vertical hollow shaft rotatably installed on the inner wall of the housing and the support plate; the small helical gear is fixed on the hollow sleeve shaft and meshes with the large helical gear, and the large helical gear changes its own horizontal shaft rotation into the vertical shaft rotation of the small helical gear; the groove member is fixed on the hollow sleeve shaft; the small gear shaft is movably sleeved in the hollow sleeve shaft, its lower end is in transmission cooperation with the upper end of the vertical output shaft, and its upper end extends out of the hollow sleeve shaft; the small gear is fixed on the extending part of the upper end of the small gear shaft; the sprocket shaft is vertically and rotatably installed on the inner wall of the housing and the support plate; the sprocket is fixed on the sprocket shaft and can cooperate with the groove member to convert the circular rotation motion of the groove member into the intermittent rotation of the sprocket; the large gear is fixed on the sprocket shaft and meshes with the small gear.

2. The non-excitation tap-changer gear transmission mechanism according to claim 1, characterized in that: The support plate is located above the horizontal input shaft and the vertical output shaft, and the large helical gear and the small helical gear are located below the support plate; the groove member, the small gear, the sprocket and the large gear are all located above the support plate.

3. The non-excitation tap-changer gear transmission mechanism according to claim 1, characterized in that: The groove member is provided with a locking circle and rollers; a plurality of grooves for cooperating with the rollers are evenly distributed on the outer circumference of the sprocket, and an arc-shaped groove for cooperating with the locking circle is provided between adjacent grooves; when the groove member rotates one circle, the rollers are caught in the grooves and the sprocket is rotated once and then leaves the grooves, and the locking circle is reinserted into the arc-shaped groove.

4. The non-excitation tap-changer gear drive mechanism according to claim 3, characterized in that: Four grooves and arc-shaped grooves are evenly distributed on the outer circumference of the sprocket; when the groove member rotates one circle each time, the rollers are caught in the grooves and the sprocket is rotated 90° and then leaves the grooves, and the locking circle is reinserted into the arc-shaped groove.

5. The non-excitation tap-changer gear transmission mechanism according to claim 4, characterized in that: When the large helical gear rotates 360°, the small helical gear rotates 720°.

6. The non-excitation tap-changer gear drive mechanism according to claim 1, characterized in that: A positioning member is further included; one end of the positioning member is detachably connected to the housing, and the other end is detachably connected to the transmission input end of the horizontal input shaft.

7. The non-excitation tap-changer gear transmission mechanism according to claim 1, wherein: A pointer and a position-in-place indicator plate for jointly indicating whether the current stop position of the horizontal input shaft is correct are further included; the pointer is fixed at a preset position of the horizontal input shaft by screws and rotates synchronously with the horizontal input shaft; the position-in-place indicator plate is fixed at a preset position of the housing and corresponds to the position of the pointer, and an indication mark for cooperating with the pointer to indicate whether the stop position of the horizontal input shaft is correct is provided on its surface.

8. The non-excitation tap-changer gear transmission mechanism according to claim 1, characterized in that: The indication mark includes a green area indicating that the pointer and the stop position of the horizontal input shaft are correct, a red area indicating that the pointer and the stop position of the horizontal input shaft are incorrect, a rotation direction arrow indicating the rotation direction of the pointer and the horizontal input shaft, and a text description.

9. The no-excitation tap-changer gear transmission mechanism according to claim 1, characterized in that: The top of the housing is open, and a lid is detachably covered at the opening. An observation window is provided on the lid. The observation window is sealed with a glass sheet, and a sealing ring is provided at the connection between the glass sheet and the lid. A gear position plate is provided on the pinion gear, and gear position numbers are set on the gear position plate. When the gear position plate rotates with the pinion gear, the gear position numbers thereon sequentially pass directly below the observation window. At the same time, at least one arrow indicating the gear position in red is evenly arranged on the upper surface of the large gear, and the arrow rotates with the large gear and sequentially passes directly below the observation window.

10. The non-excitation tap-changer gear transmission mechanism according to claim 9, characterized in that: A transparent rain shield that covers and can open the observation window is provided on the lid above the observation window.

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