Gear displaying and limiting device of tap switch operating mechanism

Abstract

A gear displaying and limiting device of a tap switch operating mechanism comprises an output shaft of the operating mechanism, a driving wheel and a first worm wheel are arranged on the output shaft, and an action indicating shaft and a gear indicating shaft which are parallel to each other are further arranged in the tap switch operating mechanism. A second worm gear meshed with the first worm gear is arranged on the action indication shaft, a double-layer gear is arranged on the action indication shaft, and the double-layer gear comprises a full-tooth gear and a single-tooth gear; the full-tooth gear is in linkage with a gear gear installed on a gear indicating shaft, and the gear gear is in key connection with the gear indicating shaft. The single-tooth gear is meshed with a limiting gear, and a limiting transmission mechanism is arranged between the limiting gear and the driving wheel. The mechanism is suitable for tap switches of various models, and the double-layer gear on the action indication shaft not only can enable the gear display to be accurate through the full-tooth gear, but also can realize reliable mechanical limit at a limit position through the single-tooth gear.

Description

Technical Field

[0001] The utility model relates to a tap switch of a transformer, in particular to a gear position display and limit device of a tap switch operating mechanism which can limit the output shaft from continuing to rotate after reaching the lowest / highest gear position. Background Art

[0002] As power supply lines become longer, denser, and wider, the requirements for power supply quality and voltage are getting higher and higher. In this context, there is a great demand for power transmission and transformation transformers, and at the same time, the performance requirements for transformers are greatly enhanced, especially the voltage regulation range of transformers is increased, and the number of transformer taps is increased from 7, 9, 17, 19, 27, 35 to a maximum of 107; the gears of the tap switch operating mechanism are increased simultaneously.

[0003] In order for the tap changer operating mechanism to realize the output of gear position signal, gear position pointer indication and mechanical limit at both ends, a reduction gear must be added in the middle. There are two types of reduction gears currently used in the market: one is full gear reduction and the other is a single-tooth reduction mechanism.

[0004] The advantage of full gear ratio is that the gear position is accurate, but the disadvantage is that it is difficult to achieve mechanical limit at both ends when there are multiple gears. (Full gear ratio is uniform rotation. The more gears there are, the greater the speed ratio. The gear with a large speed ratio rotates slowly and cannot achieve mechanical limit within the specified range of "output shaft rotates within 2 circles". The moving size of the limit shaft fails to reach the limit position).

[0005] The advantage of a single-tooth speed ratio is that it can reliably achieve mechanical limiting in multiple gears. The disadvantage is that when the ball of the single-tooth reduction mechanism is loose, gear confusion will occur.

[0006] The patent number 202021685908.8 published by the China Patent Office on April 13, 2021 is a limit limit device for the manual operating mechanism of a tap changer. The limit limit device is arranged on the manual operating mechanism of the tap changer. The manual operating mechanism of the tap changer consists of a base, a mounting bracket, a main shaft, a limit mechanism and a transmission gear. A spline for connecting a socket wrench is arranged on the main shaft. The main shaft is coaxially connected to a coupling and connected to the tap changer through a coupling. A gear is installed on the main shaft, which is connected to the transmission gear. A limit wheel is arranged on the main shaft, a limit convex point is arranged at the bottom of the limit wheel, a limit groove is arranged on the base, and the limit convex point extends into the limit groove, and the limit wheel rotates with the main shaft. It can actively lock the rotation of the main shaft beyond the gear range. This limit device cannot accurately display the gear when there are too many gears. Summary of the invention

[0007] The purpose of the utility model is to provide a gear position display and limit device for a tap changer operating mechanism that can display the gear position accurately and realize reliable mechanical limit in view of the defects and shortcomings of the above-mentioned prior art.

[0008] To achieve the above-mentioned purpose, the technical solution adopted by the utility model is: the gear position display and limit device of the tap switch operating mechanism comprises an output shaft of the operating mechanism, a driving wheel and a first worm gear are arranged on the output shaft, an action indication shaft and a gear position indication shaft parallel to each other are also arranged in the tap switch operating mechanism, a second worm gear meshing with the first worm gear is arranged on the action indication shaft, a double-layer gear is arranged on the action indication shaft, and the double-layer gear comprises a full-tooth gear and a single-tooth gear;

[0009] The full-tooth gear is linked to the gear gear mounted on the gear indicating shaft, and the gear gear and the gear indicating shaft are key-connected;

[0010] The single-tooth gear is meshed with the limit gear, a limit convex point at the limit position is arranged at the bottom of the limit gear, a limit stop pin is arranged on the end face of the driving wheel, and a limit transmission mechanism is arranged between the limit convex point and the limit stop pin. When in the limit position, the limit convex point drives the limit transmission mechanism to resist the limit stop pin, thereby locking the driving wheel.

[0011] The limiting gear is evenly distributed in a ring with positioning holes with the same number of teeth as the limiting gear. Ball marbles are arranged on both sides of the limiting gear. When the single-tooth gear rotates until the single tooth is disengaged from the limiting gear, the ball marbles are embedded in the positioning holes, so that the limiting gear cannot rotate due to inertia.

[0012] The limit gear is movably sleeved on the gear indicating shaft.

[0013] A bearing is arranged inside the limit gear, and the inner hole of the bearing is installed on the gear indicating shaft.

[0014] A reduction gear set is arranged between the full-tooth gear and the gear position gear.

[0015] The action indicating shaft is provided with an action rotary switch, and the action rotary switch is provided with an action signal transmission device; the gear indicating shaft is provided with a gear rotary switch, and the gear rotary switch is provided with a gear signal transmission device.

[0016] An action pointer is arranged on the action indicating shaft, and a gear pointer is arranged on the gear indicating shaft.

[0017] The limit transmission mechanism includes a limit lever, a limit paddle and a limit push rod. After the limit convex point contacts the limit lever, the limit push rod is driven to extend outward to the rotation track of the limit stop pin through the transmission of the limit paddle.

[0018] The limit push rod is sleeved with a spring, and the restoring force of the spring drives the limit push rod to retract inwards.

[0019] There are two limit protrusions at the bottom of the gear gear, namely an upper limit protrusion and a lower limit protrusion, the limit paddle includes an upper limit paddle and a lower limit paddle, the limit push rod includes an upper limit push rod and a lower limit push rod, and the limit stop pin includes an upper limit stop pin and a lower limit stop pin.

[0020] The utility model is suitable for various types of tap switches. The double-layer gears on the action indicating shaft can not only make the gear position display accurate through the full-tooth gears, but also realize reliable mechanical limiting at the extreme position through the single-tooth gears, thereby avoiding the transmission of torque to the tap switch and effectively protecting the output shaft of the tap switch to avoid gear collapse and shaft breakage. It has the advantages of simple structure, convenient operation, fast operation and no delay, and has good market prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the structure of the utility model.

[0022] Figure 2 This is a schematic diagram of the structure of the action indicating shaft of the utility model.

[0023] Figure 3 This is a schematic diagram of the gear display transmission of the utility model.

[0024] Figure 4 This is a schematic diagram of the limit gear transmission of the utility model.

[0025] Figure 5 It is a cross-sectional view of the limiting gear of the utility model. DETAILED DESCRIPTION

[0026] like Figure 1 , Figure 2 As shown, the utility model is a gear position display and limit device of a tap switch operating mechanism, which includes an output shaft 10 of the operating mechanism, on which a driving wheel 11 and a first worm gear 12 are arranged, and the driving wheel 11 is driven by a motor or hand crank, so that the output shaft 10 can rotate synchronously. An action indication shaft 20 and a gear position indication shaft 30 which are parallel to each other are also arranged in the tap switch operating mechanism. A second worm gear 22 meshing with the first worm gear 12 is arranged on the action indication shaft 20, so that the output shaft 10 can drive the action indication shaft 20 to rotate synchronously. A double-layer gear 21 is arranged on the action indication shaft 20, and the double-layer gear 21 includes a full-tooth gear 21.1 and a single-tooth gear 21.2, and the full-tooth gear 21.1 and the single-tooth gear 21.2 are arranged up and down. An action rotary switch 23 is arranged on the top of the action indication shaft 20, and an action signal transmission device is arranged on the action rotary switch 23, which is used to remotely read the rotation angle of the action indication shaft 20. An action pointer 24 is provided on the action indicating shaft 20 , and the rotation angle of the action indicating shaft 20 can be read in conjunction with the dial.

[0027] like Figure 3 As shown, the full-tooth gear 21.1 is linked with the gear gear 31 installed on the gear indicating shaft 30, and the gear gear 31 is key-connected with the gear indicating shaft 30. Therefore, when the action indicating shaft 20 rotates, the gear indicating shaft 30 can also rotate synchronously to ensure the gear position is accurate. A reduction gear set 60 is arranged between the full-tooth gear 21.1 and the gear gear 31. The reduction gear set 60 enables the action indicating shaft 20 to rotate one circle, while the gear indicating shaft 30 only rotates one gear angle. A gear rotation switch 32 is arranged on the top of the gear indicating shaft 30, and a gear signal transmission device is arranged on the gear rotation switch 32 for remotely reading the rotation angle of the gear indicating shaft 30. A gear pointer 33 is arranged on the gear indicating shaft 30, and the rotation angle of the gear indicating shaft 30 can be read in conjunction with the dial.

[0028] like Figure 4 , Figure 5 As shown, the single-tooth gear 21.2 is meshed with the limit gear 50, a limit convex point 51 at the limit position is arranged at the bottom of the limit gear 50, a limit stop pin 13 is arranged at the end face of the driving wheel 11, and a limit transmission mechanism 40 is arranged between the limit convex point 51 and the limit stop pin 13. When in the limit position, the limit convex point 51 drives the limit transmission mechanism 40 to abut against the limit stop pin 13 to lock the driving wheel 11. The limit gear 50 can be movably mounted on the gear indicating shaft 30, or a bearing 54 can be arranged in the limit gear 50, and the inner hole of the bearing 54 is installed on the gear indicating shaft 30. In this way, the gear indicating shaft 30 and the limit gear 50 can rotate independently without affecting each other.

[0029] In the embodiment, the transmission ratio of the first worm gear 12 and the second worm gear 22 is 33:1, that is, the output shaft 10 rotates 33 times to drive the action indicating shaft 20 to rotate one circle. Since the single-tooth gear 21.2 has only one tooth, the limit gear 50 can only be driven to rotate by the single tooth when the output shaft 10 starts 2 circles and ends 2 circles. The limit gear 50 is evenly distributed with positioning holes with the same number of teeth as the limit gear 50 in an annular pattern. Ball marbles 53 are arranged on both sides of the limit gear 50. When the single-tooth gear 21.2 rotates until the single tooth is separated from the limit gear 50, the ball marbles 53 are embedded in the positioning holes, so that the limit gear 50 cannot rotate due to inertia. There are two limit convex points 51 on the limit gear 50, namely, the upper limit convex point 51.1 and the lower limit convex point 51.2. Since the dynamic of the limit gear 50 is concentrated in the front and rear 2 circles, its dynamic size is larger than the mechanical limit position, so that the output shaft 10 can achieve complete mechanical limit within 2 circles.

[0030] The limit transmission mechanism 40 includes a limit lever 41, a limit paddle 42 and a limit push rod 43. After the limit convex point 51 contacts the limit lever 41, the limit push rod 43 is driven to extend outward to the rotation track of the limit stop pin 13 through the transmission of the limit paddle 42, and the limit push rod 43 blocks the rotation track of the limit stop pin 13, thereby realizing the mechanical limit of the driving wheel 11. The limit push rod 43 is sleeved with a spring. After the limit convex point 51 leaves the limit lever 41, the restoring force of the spring drives the limit push rod 43 to retract inward.

[0031] The bottom of the gear 31 is provided with two limit convex points 51, which are an upper limit convex point 51.1 and a lower limit convex point 51.2, respectively. The limit paddle 42 includes an upper limit paddle 42.1 and a lower limit paddle 42.2, the limit push rod 43 includes an upper limit push rod 43.1 and a lower limit push rod 43.2, and the limit stop pin 13 includes an upper limit stop pin 13.1 and a lower limit stop pin 13.2. When the gear reaches the upper limit, the upper limit convex point 51.1 contacts the limit lever 41, drives the limit lever 41 to push the upper limit paddle 42.1, pushes out the upper limit push rod 43.1, blocks the rotation track of the upper limit stop pin 13.1, and realizes the mechanical limit of the driving wheel 11. When the gear reaches the lower limit, the lower limit protrusion 51.2 contacts the limit lever 41, driving the limit lever 41 to push the lower limit paddle 42.2, pushing out the lower limit push rod 43.2, blocking the rotation trajectory of the lower limit stop pin 13.2, and realizing the mechanical limit of the driving wheel 11.

[0032] The utility model is suitable for various types of tap switches. The double-layer gear 21 on the action indicating shaft 20 can not only make the gear position display accurate through the full-tooth gear 21.1, but also realize reliable mechanical limit at the extreme position through the single-tooth gear 21.2, thereby avoiding the transmission of torque to the tap switch, and effectively protecting the output shaft 10 of the tap switch to avoid gear collapse and shaft breakage. The utility model has the advantages of simple structure, convenient operation, fast operation and no delay, and has good market prospects.

Claims

1. A gear position display and limit device for a tap switch operating mechanism, comprising an output shaft of the operating mechanism, a driving wheel and a first worm gear are arranged on the output shaft, an action indication shaft and a gear position indication shaft parallel to each other are arranged in the tap switch operating mechanism, a second worm gear meshing with the first worm gear is arranged on the action indication shaft, and the device is characterized in that The action indicating shaft is provided with a double-layer gear, which includes a full-tooth gear and a single-tooth gear; The full-tooth gear is linked to the gear gear mounted on the gear indicating shaft, and the gear gear and the gear indicating shaft are key-connected; The single-tooth gear is meshed with the limit gear, a limit convex point at the limit position is arranged at the bottom of the limit gear, a limit stop pin is arranged on the end face of the driving wheel, and a limit transmission mechanism is arranged between the limit convex point and the limit stop pin. When in the limit position, the limit convex point drives the limit transmission mechanism to resist the limit stop pin, thereby locking the driving wheel.

2. The gear position display and limit device of the tap changer operating mechanism according to claim 1, characterized in that The limiting gear is evenly distributed in a ring with positioning holes with the same number of teeth as the limiting gear. Ball marbles are arranged on both sides of the limiting gear. When the single-tooth gear rotates until the single tooth is disengaged from the limiting gear, the ball marbles are embedded in the positioning holes, so that the limiting gear cannot rotate due to inertia.

3. The gear position display and limit device of the tap changer operating mechanism according to claim 1, characterized in that The limit gear is movably sleeved on the gear indicating shaft.

4. The gear position display and limit device of the tap changer operating mechanism according to claim 1, characterized in that A bearing is arranged inside the limit gear, and the inner hole of the bearing is installed on the gear indicating shaft.

5. The gear position display and limit device of the tap changer operating mechanism according to claim 1, characterized in that A reduction gear set is arranged between the full-tooth gear and the gear position gear.

6. The gear position display and limit device of the tap changer operating mechanism according to claim 1, characterized in that The action indicating shaft is provided with an action rotary switch, and the action rotary switch is provided with an action signal transmission device; the gear indicating shaft is provided with a gear rotary switch, and the gear rotary switch is provided with a gear signal transmission device.

7. The gear position display and limit device of the tap changer operating mechanism according to claim 1, characterized in that An action pointer is arranged on the action indicating shaft, and a gear pointer is arranged on the gear indicating shaft.

8. The gear position display and limit device of the tap changer operating mechanism according to any one of claims 1 to 7, characterized in that The limit transmission mechanism includes a limit lever, a limit paddle and a limit push rod. After the limit convex point contacts the limit lever, the limit push rod is driven to extend outward to the rotation track of the limit stop pin through the transmission of the limit paddle.

9. The gear position display and limit device of the tap changer operating mechanism according to claim 8, characterized in that The limit push rod is sleeved with a spring, and the restoring force of the spring drives the limit push rod to retract inwards.

10. The gear position display and limit device of the tap changer operating mechanism according to claim 8, characterized in that There are two limit protrusions at the bottom of the gear gear, namely an upper limit protrusion and a lower limit protrusion, the limit paddle includes an upper limit paddle and a lower limit paddle, the limit push rod includes an upper limit push rod and a lower limit push rod, and the limit stop pin includes an upper limit stop pin and a lower limit stop pin.

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