Tap switch electric mechanism

Abstract

The utility model discloses an electric mechanism for a tap switch, which comprises a case (1), a belt transmission mechanism is horizontally arranged at the top of the case (1), and a gear transmission case with a gear display panel (2) is vertically arranged in the case (1); a transmission shaft (3) is vertically arranged on the belt transmission mechanism, and a three-stage gear transmission mechanism with a pointer is arranged in the gear transmission box; an encoder (4) is arranged at the end part of the lower end of the transmission shaft (3); and the lower part of the transmission shaft (3) is connected with the three-stage gear transmission mechanism through a worm and gear mechanism. The utility model has the advantages of ingenious structural design, practicability and reliability, not only can realize accurate position, speed and torque control and position error less than 1 degree, but also has the advantages of short acceleration and deceleration response time, capability of quickly tracking instruction change, strong overload resistance, capability of bearing instantaneous load which is 2-3 times of rated torque and high reliability. The method is suitable for scenes of frequent start and stop or impact load, has no out-of-step phenomenon during low-speed operation, and is high in stability.

Description

Technical Field

[0001] This utility model relates to the field of transformer tap changer accessories, specifically to an electric mechanism for a tap changer. Background Technology

[0002] Currently, the electric mechanism of the tap changer can provide power for the tap changer's tapping action under load, perform accurate tap position control and switching, and easily read the current status of the tap changer.

[0003] Chinese patent application CN115148515A discloses an invention patent entitled "An Electric Mechanism for a Tap Switch", which includes a chassis and the following components respectively installed in the chassis: a rotary output shaft, a reduction mechanism, a drive motor, a position display and gear signal transmission device, and an intelligent controller. The position display and gear signal transmission device includes a frame, a worm gear, a rotary input shaft, a progressive signal switch, a display disk drive transmission mechanism, a display disk mechanism, a contact signal disk drive transmission mechanism, a low-gear contact signal switching mechanism, and a high-gear contact signal switching mechanism.

[0004] Regarding this document, since the high-level power signal switching mechanism uses two PCB boards for gear position display, this is prone to causing gear position display errors, making it inconsistent with the actual gear position.

[0005] CN222762822U discloses a utility model patent entitled "Gear Position Display and Limiting Device for Tap Switch Operating Mechanism," which includes an output shaft of an operating mechanism. A drive wheel and a first worm gear are mounted on the output shaft. The tap switch operating mechanism also includes a parallel action indicator shaft and a gear position indicator shaft. A second worm gear meshes with the first worm gear on the action indicator shaft. The action indicator shaft also has a double-layer gear, comprising a full-tooth gear and a single-tooth gear. The full-tooth gear is linked to a gear position gear mounted on the gear position indicator shaft, and the gear position gear and gear position indicator shaft are keyed together. The single-tooth gear meshes with a limiting gear, and a limiting transmission mechanism is provided between the limiting gear and the drive wheel.

[0006] In this document, the double-gear position is operated by a single gear, which is prone to uneven mechanical limit of gear position. At the same time, the PCB gear position display in this device is prone to displaying incorrect gear positions, making it inconsistent with the actual gear position. Utility Model Content

[0007] The purpose of this invention is to provide an electric tap changer mechanism with high control precision and accurate gear position display.

[0008] The purpose of this utility model is achieved through the following technical solution: an electric tap changer mechanism, including a housing, a belt drive mechanism horizontally arranged on the top of the housing, a gear transmission box with a gear position display panel vertically arranged inside the housing; a drive shaft vertically arranged on the belt drive mechanism, a three-stage gear transmission mechanism with a pointer arranged inside the gear transmission box; an encoder arranged at the lower end of the drive shaft; and the lower part of the drive shaft connected to the three-stage gear transmission mechanism via a worm gear mechanism.

[0009] The belt drive mechanism includes a mounting plate horizontally mounted on the upper surface of the chassis, a servo motor vertically mounted at one end of the mounting plate, and a pulley mounted at the other end of the mounting plate. The servo motor is connected to the pulley via a belt. The drive shaft is vertically mounted at the center of the pulley.

[0010] The gear transmission box includes a vertical plate, and side plates are provided on both sides of the vertical plate. The gear position display panel is located on the front side of the side plates.

[0011] Furthermore, the worm gear mechanism includes a worm sleeved on the lower part of the transmission shaft and a worm wheel disposed on the back of the vertical plate, wherein the worm meshes with the worm wheel.

[0012] The three-stage gear transmission mechanism with pointers includes a small pointer shaft, a large pointer shaft, gear shaft A, and gear shaft B. A small pointer and cylindrical gear A are mounted on the small pointer shaft; a large pointer and cylindrical gear B are mounted on the large pointer shaft; cylindrical gears C and D are mounted on gear shaft A; and cylindrical gears E and F are mounted on gear shaft B. Cylindrical gears A and C mesh, D and E mesh, and F mesh with gear B. One end of the small pointer shaft passes through the vertical plate and into the center of the worm gear. The large pointer shaft, gear shaft A, and gear shaft B all pass through the vertical plate and are rotatably connected to it. The front ends of both the small and large pointer shafts pass through the gear position display panel. The small and large pointers engage with the gear position display lines on the gear position display panel.

[0013] In order to enable manual operation in the event of a power outage, a manual operation mechanism is provided on the upper part of the gear transmission box.

[0014] The manual operating mechanism includes a manual shaft that passes vertically through the upright plate, a graphite copper sleeve on the manual shaft, and a manual operating seat connected to the front end face of the upright plate fitted on the graphite copper sleeve; a helical gear A and a spring are arranged on the manual shaft and located on the back of the upright plate, one end of the spring abuts against the end face of the helical gear A, and the other end abuts against a spring seat connected to the lower end face of the mounting plate; the helical gear A meshes with a helical gear B arranged on the transmission shaft.

[0015] The manual shaft has a through groove at its end; a knob plunger is provided on the outer wall of the manual operating seat and passes through the manual operating seat; a limit switch is provided on the outer wall of the manual operating seat, one end of which passes through the manual operating seat and is electrically connected to the servo motor.

[0016] To achieve mechanical limiting, a connecting block is provided on the front end face of the vertical plate and above the cylindrical gear B. The connecting block is movably connected to the vertical plate by screws. A push rod is provided vertically downward at one end of the connecting block, and a limit rod is provided vertically upward at the other end of the connecting block. The limit rod passes through a linear slide on the vertical plate and its upper end passes through a mounting plate. A limit pin is provided on the lower end face of the pulley, and the limit rod cooperates with the limit pin. A mounting shaft is provided on the back of the cylindrical gear B and at its edge, and a bearing is provided on the mounting shaft. The push rod cooperates with the bearing.

[0017] To protect against rain, a rain cover is fitted onto the upper part of the drive shaft; the rain cover is connected to a bearing seat located on the upper surface of the mounting plate.

[0018] Due to the adoption of the above technical solution, this utility model has the advantages of ingenious structural design and practical reliability. It can not only achieve precise position, speed and torque control with a position error of less than 1 degree, but also has short acceleration and deceleration response time, can quickly track command changes, has strong overload resistance, can withstand instantaneous loads of 2 to 3 times the rated torque, is suitable for scenarios with frequent start and stop or impact loads, has no step loss phenomenon when running at low speed, and has high stability. Attached Figure Description

[0019] The accompanying drawings of this utility model are described below:

[0020] Figure 1 This is a schematic diagram of the structure of this utility model;

[0021] Figure 2 This is a schematic diagram of the internal structure of this utility model;

[0022] Figure 3 This is a schematic diagram of the three-stage gear transmission mechanism of this utility model;

[0023] Figure 4 for Figure 2 Rear view;

[0024] Figure 5 This is a schematic diagram of the manual operation mechanism of this utility model;

[0025] Figure 6 This is a schematic diagram of the structure of this utility model after the limit switch is removed;

[0026] Figure 7This is a schematic diagram of the handle structure of this utility model;

[0027] Figure 8 This is a schematic diagram of the structure of the limiting rod and the limiting pin of this utility model. Detailed Implementation

[0028] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings. However, this utility model is not limited to these embodiments. Any improvements or substitutions based on the basic spirit of these embodiments shall still fall within the scope of protection claimed by the claims of this utility model.

[0029] Example 1: As Figure 1 , 2 As shown in Figure 4, an electric tap changer mechanism includes a housing 1. A belt drive mechanism is horizontally arranged on the top of the housing 1. A gear transmission box with a gear position display panel 2 is vertically arranged inside the housing 1. A drive shaft 3 is vertically arranged on the belt drive mechanism. A three-stage gear transmission mechanism with a pointer is arranged inside the gear transmission box. An encoder 4 is arranged at the lower end of the drive shaft 3. The lower part of the drive shaft 3 is connected to the three-stage gear transmission mechanism through a worm gear mechanism.

[0030] The belt drive mechanism includes a mounting plate 5 horizontally mounted on the upper surface of the housing 1, a servo motor 6 vertically mounted on one end of the mounting plate 5, and a pulley 7 mounted on the other end of the mounting plate 5. The servo motor 6 is connected to the pulley 7 via a belt 8. The drive shaft 3 is vertically mounted at the center of the pulley 7.

[0031] Furthermore, the gear transmission box includes a vertical plate 9, and side plates 10 are provided on both sides of the vertical plate 9, with the gear position display plate 2 located on the front side of the side plates 10.

[0032] In this utility model, the worm gear mechanism includes a worm 11 sleeved on the lower part of the transmission shaft 3 and a worm wheel 12 disposed on the back of the vertical plate 9, wherein the worm 11 meshes with the worm wheel 12.

[0033] like Figure 3As shown, further described, the three-stage gear transmission mechanism with pointers includes a small pointer shaft 13, a large pointer shaft 14, a gear shaft A15, and a gear shaft B16. A small pointer 17 and a cylindrical gear A18 are mounted on the small pointer shaft 13; a large pointer 19 and a cylindrical gear B20 are mounted on the large pointer shaft 14; cylindrical gears C21 and D22 are mounted on the gear shaft A15; and cylindrical gears E23 and F24 are mounted on the gear shaft B16. The cylindrical gear A18... The cylindrical gear C21 meshes with the cylindrical gear D22, which meshes with the cylindrical gear E23, and the cylindrical gear F24 meshes with the cylindrical gear B20. One end of the small pointer shaft 13 passes through the vertical plate 9 and enters the center of the worm gear 12. The large pointer shaft 14, gear shaft A15, and gear shaft B16 all pass through the vertical plate 9 and are rotatably connected to the vertical plate 9. The front ends of the small pointer shaft 13 and the large pointer shaft 14 both pass through the gear position display plate 2. The small pointer 17 and the large pointer 19 engage with the gear position display line provided on the gear position display plate 2.

[0034] In this utility model, a three-stage gear transmission mechanism is adopted, which makes the transmission smoother; an encoder 4 is set to provide timely and accurate feedback on the gear position and number of revolutions. After the gear position is set in the electrical control part, it can limit the high and low gears during operation; and the mechanism can also record the number of revolutions of the electric mechanism during manual operation when the power is off. When the electric mechanism is restored to power, it can provide timely feedback to the transformer monitoring background.

[0035] like Figure 5 As shown, a manual operation mechanism is provided on the upper part of the gear transmission box for manual operation.

[0036] The manual operating mechanism includes a manual shaft 25 that passes vertically through the upright plate 9, a graphite copper sleeve 26 on the manual shaft 25, and a manual operating seat 27 connected to the front end face of the upright plate 9 fitted on the graphite copper sleeve 26; a helical gear A28 and a spring 29 are arranged on the manual shaft 25 and located on the back of the upright plate 9, one end of the spring 29 abuts against the end face of the helical gear A28, and the other end abuts against the spring seat 30 connected to the lower end face of the mounting plate 5; the helical gear A28 meshes with a helical gear B31 arranged on the transmission shaft 3.

[0037] The manual shaft 25 has a through groove 34 at its end; a knob plunger 35 is provided on the outer wall of the manual operating seat 27 and passes through the manual operating seat 27; a limit switch 36 is provided on the outer wall of the manual operating seat 27, one end of the limit switch 36 passes through the manual operating seat 27, and the limit switch 36 is electrically connected to the servo motor 6.

[0038] like Figure 7As shown, the handle 44 can be connected to the external handle through the through groove 34; at the same time, an annular groove 45 is provided on the handle 44. When the handle 44 is inserted into the manual shaft 25, one end of the knob plunger 35 is inserted into the annular groove 45, which can effectively prevent the handle 44 from falling off when rotating; when the handle 44 is inserted into the manual shaft, the limit switch 36 is activated to cut off the operation of the servo motor.

[0039] After the handle 44 is inserted into the manual operation seat 27, the limiting block 46 set in the handle 44 is locked in the through slot 34; then the handle 44 is turned to make the manual shaft 25 rotate, the rotating manual shaft 25 drives the helical gear A28 to rotate, the rotating helical gear A28 drives the helical gear B31 to rotate, the rotation of the helical gear B31 drives the transmission shaft 3 to rotate, and the transmission shaft 3 drives the three-stage gear transmission mechanism to work through the worm gear.

[0040] like Figure 6 , 8 As shown, to achieve mechanical limiting, a connecting block 37 is provided on the front end face of the vertical plate 9 and above the cylindrical gear B20. The connecting block 37 is movably connected to the vertical plate 9 by screws 38. A push rod 39 is provided vertically downward at one end of the connecting block 37, and a limiting rod 40 is provided vertically upward at the other end of the connecting block 37. The limiting rod 40 passes through the linear slide block 41 provided on the vertical plate 9 and its upper end passes through the mounting plate 5. A limiting pin 47 is provided on the lower end face of the pulley 7, and the limiting rod 40 cooperates with the limiting pin 47. A mounting shaft 42 is provided on the back of the cylindrical gear B20 and at the edge of the cylindrical gear B20, and a bearing 43 is provided on the mounting shaft 42. The push rod 39 cooperates with the bearing 43.

[0041] When the cylindrical gear B20 rotates, the bearing 43 reaches the push rod 39 and pushes the push rod 39 upward. At this time, the push rod 39 drives the connecting block 37 to move upward, which in turn drives the limit rod 40 to move upward. When the pulley 7 rotates, when the pulley 7 drives the limit pin 47 to the position of the limit rod 40, the limit rod 40 will press against the limit pin 47 to achieve mechanical limiting.

[0042] For rain protection, a rain cover 32 is fitted on the upper part of the drive shaft 3; the rain cover 32 is connected to the bearing seat 33 located on the upper end face of the mounting plate 5.

[0043] The invention works as follows: the servo motor 6 drives the pulley 8 to rotate via the belt 7, which in turn drives the transmission shaft 3 to rotate. The rotation of the transmission shaft then drives the worm gear 11 to rotate. Since the worm wheel 12 is meshed with the worm gear 11, it drives the worm wheel 12 to rotate. The rotation of the worm wheel drives the three-stage gear transmission mechanism to work, so that the large and small pointers can correctly display the gear position. During this process, the encoder 4 can accurately record the number of revolutions and feed it back to the backend.

[0044] In this utility model, the power transmission of the three-stage gear transmission mechanism is as follows:

[0045] Worm gear 12 - Small pointer shaft 13 - Small pointer 17 and cylindrical gear A18 - Cylindrical gear C21 - Gear shaft A15 - Cylindrical gear D22 - Cylindrical gear E23 - Gear shaft B16 - Cylindrical gear F24 - Cylindrical gear B20 - Large pointer shaft 14 and large pointer 19.

[0046] In this utility model, a three-stage gear transmission mechanism is adopted, which makes the transmission smoother. An encoder 4 is set to provide timely and accurate feedback on the gear position and number of revolutions. After the gear is set, it can limit the high and low gears during operation.

[0047] In this invention, the servo motor 6 only performs work when needed, with current consumption proportional to the load. Under light loads, its efficiency approaches 90%, far exceeding that of traditional motors. It offers a wide speed range and high adaptability: supporting smooth speed regulation from 0.1 RPM to several thousand RPM, suitable for complex environments such as explosion-proof servo motors and high / low temperature resistant models. This effectively meets the diverse and complex operating conditions in the transformer industry.

Claims

1. A tap changer electric mechanism, comprising a housing (1), characterized in that: in A belt drive mechanism is horizontally arranged on the top of the chassis (1), and a gear transmission box with a gear position display panel (2) is vertically arranged inside the chassis (1); a drive shaft (3) is vertically arranged on the belt drive mechanism, and a three-stage gear transmission mechanism with a pointer is arranged inside the gear transmission box; an encoder (4) is arranged at the lower end of the drive shaft (3); the lower part of the drive shaft (3) is connected to the three-stage gear transmission mechanism through a worm gear mechanism.

2. The tap changer electric mechanism as described in claim 1, characterized in that: The belt drive mechanism includes a mounting plate (5) horizontally mounted on the upper surface of the chassis (1), a servo motor (6) vertically mounted on one end of the mounting plate (5), and a pulley (7) mounted on the other end of the mounting plate (5). The servo motor (6) is connected to the pulley (7) via a belt (8). The drive shaft (3) is vertically mounted at the center of the pulley (7).

3. The tap changer electric mechanism as described in claim 2, characterized in that: The gear transmission box includes a vertical plate (9), and side plates (10) are provided on both sides of the vertical plate (9). The gear position display plate (2) is located on the front side of the side plate (10).

4. The tap changer electric mechanism as described in claim 3, characterized in that: The worm gear mechanism includes a worm (11) sleeved on the lower part of the transmission shaft (3) and a worm wheel (12) set on the back of the vertical plate (9), wherein the worm (11) meshes with the worm wheel (12).

5. The tap changer electric mechanism as described in claim 4, characterized in that: The three-stage gear transmission mechanism with pointers includes a small pointer shaft (13), a large pointer shaft (14), gear shaft A (15), and gear shaft B (16). A small pointer (17) and a cylindrical gear A (18) are mounted on the small pointer shaft (13). A large pointer (19) and a cylindrical gear B (20) are mounted on the large pointer shaft (14). Cylindrical gears C (21) and D (22) are mounted on gear shaft A (15). Cylindrical gears E (23) and F (24) are mounted on gear shaft B (16). The cylindrical gears A (18) and C (19) are connected to each other. 21) Meshing: the cylindrical gear D (22) meshes with the cylindrical gear E (23), and the cylindrical gear F (24) meshes with the cylindrical gear B (20); one end of the small pointer shaft (13) passes through the vertical plate (9) and enters the center of the worm gear (12); the large pointer shaft (14), gear shaft A (15) and gear shaft B (16) all pass through the vertical plate (9) and are rotatably connected to the vertical plate (9); the front ends of the small pointer shaft (13) and the large pointer shaft (14) both pass through the gear position display plate (2); their small pointer (17) and large pointer (19) cooperate with the gear position display line set on the gear position display plate (2).

6. The tap changer electric mechanism as described in claim 5, characterized in that: A manual operating mechanism is provided on the upper part of the gear transmission box.

7. The tap changer electric mechanism as described in claim 6, characterized in that: The manual operating mechanism includes a manual shaft (25) that passes vertically through the upright plate (9), a graphite copper sleeve (26) on the manual shaft (25), and a manual operating seat (27) connected to the front end face of the upright plate (9) fitted on the graphite copper sleeve (26); a helical gear A (28) and a spring (29) are provided on the manual shaft (25) and located on the back of the upright plate (9), one end of the spring (29) abuts against the end face of the helical gear A (28), and the other end abuts against the spring seat (30) connected to the lower end face of the mounting plate (5); the helical gear A (28) meshes with a helical gear B (31) provided on the transmission shaft (3).

8. The tap changer electric mechanism as described in claim 7, characterized in that: in The end of the manual shaft (25) is provided with a through groove (34); a knob plunger (35) is provided on the outer wall of the manual operating seat (27) and passes through the manual operating seat (27); a limit switch (36) is provided on the outer wall of the manual operating seat (27), one end of the limit switch (36) passes through the manual operating seat (27), and the limit switch (36) is electrically connected to the servo motor (6).

9. The tap changer electric mechanism as described in claim 8, characterized in that: in A connecting block (37) is provided on the front end face of the upright plate (9) and above the cylindrical gear B (20). The connecting block (37) is movably connected to the upright plate (9) by screws (38). A top rod (39) is provided vertically downward at one end of the connecting block (37), and a limit rod (40) is provided vertically upward at the other end of the connecting block (37). The limit rod (40) passes through the linear slide (41) provided on the upright plate (9) and its upper end passes through the mounting plate (5). A limit pin (47) is provided on the lower end face of the pulley (7), and the limit rod (40) cooperates with the limit pin (47). An mounting shaft (42) is provided on the back of the cylindrical gear B (20) and at the edge of the cylindrical gear B (20), and a bearing (43) is provided on the mounting shaft (42). The top rod (39) cooperates with the bearing (43).

10. The tap changer electric mechanism as described in claim 9, characterized in that: in The upper part of the drive shaft (3) is fitted with a rain cover (32); the rain cover (32) is connected to the bearing seat (33) set on the upper end face of the mounting plate (5).

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