Transmission mechanism of three-position switch

Abstract

The utility model discloses a transmission mechanism of a three-position switch, which comprises an assembling plate, a flywheel transmission assembly arranged in the middle of the lower end of the assembling plate, a limiting plate fixedly arranged in the middle of the assembling plate and matched with the flywheel transmission assembly to operate, and a first crank arm driving assembly arranged on one side of the upper end of the assembling plate and linked through the flywheel transmission assembly, the second crank arm driving assembly is mounted on the other side of the upper end of the assembling plate and is linked through a flywheel transmission assembly; the first limiting assembly is mounted on the assembling plate and is matched with the first crank arm driving assembly to operate; the second limiting assembly is mounted on the assembling plate and is matched with the second crank arm driving assembly to operate; one end of the spring piece is movably mounted with the first crank arm driving assembly, and the other end of the spring piece is movably mounted with the second crank arm driving assembly; the mechanism can improve the operation precision of equipment, prolong the service life, improve the reliability and enhance the operation safety, and is suitable for application scenes needing precision control and high stability.

Description

A transmission mechanism for a three-position switch Technical Field

[0001] This utility model specifically relates to a transmission mechanism for a three-position switch. Background Technology

[0002] The three-position isolation mechanism is mainly used during the operation and maintenance of high-voltage disconnect switches to enable the isolation contacts to remain in three positions: closed, open, and grounded. To achieve this function, the output shaft of the isolation mechanism must have three reliably repositioned positions.

[0003] Existing three-position transmission mechanisms are either a rotating shaft with a shift fork structure or an operating shaft with a welded pin and a flywheel with a long groove structure. The rotating shaft with a shift fork structure drives the output shaft via a welded shift fork on the operating shaft, while the operating shaft with a welded pin and flywheel with a long groove structure drives the flywheel with a welded or riveted pin on the operating crank arm. However, these structural solutions have the following drawbacks: 1. The drive pin and flywheel are not rigidly connected, resulting in large gaps during transmission, high energy loss, and low transmission efficiency; 2. Due to the low transmission efficiency, the flywheel's rotation radius is large to meet output power requirements, resulting in a large overall mechanism size; 3. The drive fork plate or drive flywheel is prone to deformation of its sheet metal grooves or cracking of welds due to frequent impact movements; 4. The large gap at the intermediate isolation stop position in the three positions causes the isolation flywheel to swing back and forth significantly during the opening process, affecting the distance of the live isolation break and posing a risk. Summary of the Invention

[0004] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a transmission mechanism for a three-position switch.

[0005] The technical solution adopted by this utility model to solve its technical problem is:

[0006] A transmission mechanism for a three-position switch includes an assembly plate, a flywheel drive assembly mounted at the lower center of the assembly plate, a limiting plate fixedly mounted at the center of the assembly plate and operating in conjunction with the flywheel drive assembly, a first crank arm drive assembly mounted on one side of the upper end of the assembly plate and linked to the flywheel drive assembly, a second crank arm drive assembly mounted on the other side of the upper end of the assembly plate and linked to the flywheel drive assembly, a first limiting assembly mounted on the assembly plate and operating in conjunction with the first crank arm drive assembly, a second limiting assembly mounted on the assembly plate and operating in conjunction with the second crank arm drive assembly, and a spring member with one end movably mounted to the first crank arm drive assembly and the other end movably mounted to the second crank arm drive assembly.

[0007] Preferably, a first bearing housing is installed on the assembly plate at the location where the flywheel drive assembly is assembled, a second bearing housing is installed on the assembly plate at the location where the first crank arm drive assembly is assembled, and a third bearing housing is installed on the assembly plate at the location where the second crank arm drive assembly is assembled.

[0008] Preferably, the flywheel drive assembly includes a flywheel drive shaft, a bushing fitted on the flywheel drive shaft, a limiting tooth integrally formed on the bushing and cooperating with a limiting plate to limit excessive rotation of the flywheel drive shaft, a flywheel plate fitted and fixed to the end of the flywheel drive shaft, a first hinge head fixedly installed on one side of the upper end of the flywheel plate, a first connecting rod with a groove at its upper end and fitted with the first hinge head at its lower end, a second hinge head fixedly installed on the other side of the upper end of the flywheel plate, and a second connecting rod with a groove at its upper end and fitted with the second hinge head at its lower end.

[0009] Preferably, the limiting plate is an inverted Y-shaped limiting plate.

[0010] Preferably, the first crank arm drive assembly includes a first operating shaft, a first inner limiting arm and a first crank arm that are sequentially mounted and fixed on the first operating shaft, a first drive pin that passes sequentially through the upper part of the first inner limiting arm and the upper part of the first crank arm and is hinged to one end of the spring, the two ends of the first drive pin are screwed into nuts for fixation, and the end of the first drive pin that passes through the first crank arm is provided with a first pin joint.

[0011] Preferably, the second crank arm drive assembly includes a second operating shaft, a second inner limiting arm and a second crank arm that are sequentially mounted and fixed on the second operating shaft, a second drive pin that passes sequentially through the upper part of the second inner limiting arm and the upper part of the second crank arm and is hinged to one end of the spring member, the two ends of the second drive pin are screwed into nuts for fixation, and a second pin joint is provided at one end of the second drive pin that passes through the second crank arm.

[0012] Preferably, the first limiting component includes a first rectangular iron bar fixedly installed on the assembly plate, a first limiting bolt screwed vertically into one end of the first rectangular iron bar near the assembly plate, and a second limiting bolt screwed laterally into the end of the first rectangular iron bar.

[0013] Preferably, the second limiting component includes a second rectangular iron bar fixedly installed on the assembly plate, a third limiting bolt screwed vertically into one end of the second rectangular iron bar near the assembly plate, and a fourth limiting bolt screwed laterally into the end of the second rectangular iron bar.

[0014] The beneficial effects of this utility model are as follows:

[0015] 1. The first and second limiting bolts on the first rectangular iron bar, and the third and fourth limiting bolts on the second rectangular iron bar, can be rotated and adjusted to adjust the screw-in length as needed, thereby controlling the distance between the first inner limiting arm and the first limiting bolt, the distance between the first crank arm and the second limiting bolt, the distance between the second inner limiting arm and the third limiting bolt, and the distance between the second crank arm and the fourth limiting bolt. This allows for the adjustment of reasonable spacing between the aforementioned mating structures, which is more conducive to closing, opening, and grounding operations.

[0016] 2. Because the design fully considers the cooperation of various components and the role of springs, there will be no gaps or impacts in the transmission process. During frequent operation, the wear of various components can be significantly reduced, and the service life of the transmission system can be extended.

[0017] 3. Through the linkage of the flywheel drive assembly, crank arm drive assembly and spring components, it can quickly and reliably switch between the closed, open and grounded states, ensuring that the switch operation process is efficient and reliable. It also ensures that the three-position switch can be stably locked in each state, avoiding safety hazards caused by loose components or misoperation, and providing a high level of operational safety. Attached Figure Description

[0018] Figure 1 is a front view of the transmission mechanism of a three-position switch according to the present invention;

[0019] Figure 2 is a structural diagram of the transmission mechanism of a three-position switch according to this utility model;

[0020] Figure 3 is an exploded view of Figure 2;

[0021] Figure 4 is a schematic diagram of the tripped state;

[0022] Figure 5 is a schematic diagram of the transition from the open state to the closed state;

[0023] Figure 6 is a schematic diagram of the transition from the tripped state to the grounded state; Detailed Implementation

[0024] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand the present invention and implement it. However, the embodiments are not intended to limit the present invention.

[0025] Example

[0026] A transmission mechanism for a three-position switch, as shown in Figures 1-6, includes an assembly plate 1, a flywheel transmission assembly 2 installed at the lower middle part of the assembly plate 1, a limiting plate 3 fixedly installed at the center of the assembly plate 1 and operating in conjunction with the flywheel transmission assembly 2, a first crank arm drive assembly 4 installed on one side of the upper end of the assembly plate 1 and linked by the flywheel transmission assembly 2, a second crank arm drive assembly 5 installed on the other side of the upper end of the assembly plate 1 and linked by the flywheel transmission assembly 2, a first limiting assembly 6 installed on the assembly plate 1 and operating in conjunction with the first crank arm drive assembly 4, a second limiting assembly 7 installed on the assembly plate 1 and operating in conjunction with the second crank arm drive assembly 5, and a spring member 8 with one end movably installed with the first crank arm drive assembly 4 and the other end movably installed with the second crank arm drive assembly 5.

[0027] The assembly plate 1 is equipped with a first bearing seat 11 at the location where the flywheel drive assembly 2 is assembled, a second bearing seat 12 at the location where the first crank arm drive assembly 4 is assembled, and a third bearing seat 13 at the location where the second crank arm drive assembly 5 is assembled. Specifically, the first bearing seat 11, the second bearing seat 12, and the third bearing seat 13 enable the flywheel drive assembly 2, the first crank arm drive assembly 4, and the second crank arm drive assembly 5 to rotate normally during operation.

[0028] The flywheel drive assembly 2 includes a flywheel drive shaft 21, a bushing 22 fitted on the flywheel drive shaft 21, a limiting tooth 23 integrally formed on the bushing 22 and used in conjunction with the limiting plate 3 to limit the excessive rotation of the flywheel drive shaft 21, a flywheel plate 24 fitted and fixed to the end of the flywheel drive shaft 21, a first hinge head 25 fixedly installed on one side of the upper end of the flywheel plate 24, a first connecting rod 26 with a groove on the upper end and fitted with the first hinge head 25 at the lower end, a second hinge head 27 fixedly installed on the other side of the upper end of the flywheel plate 24, and a second connecting rod 28 with a groove on the upper end and fitted with the second hinge head 27 at the lower end.

[0029] The limiting plate 3 is an inverted Y-shaped limiting plate. Specifically, the lower end of the Y-shaped limiting plate is fitted onto the flywheel drive shaft 21 and cooperates with the limiting teeth 23 formed on the bushing 22, so that the flywheel drive shaft 21 rotates within a limited angle to realize the closing, opening and grounding operations of the three-position switch.

[0030] The first crank arm drive assembly 4 includes a first operating shaft 41, a first inner limiting arm 42 and a first crank arm 43 that are sequentially mounted and fixed on the first operating shaft 41, a first drive pin 44 that passes through the upper part of the first inner limiting arm 42 and the upper part of the first crank arm 43 and is hinged to one end of the spring member 8, and the two ends of the first drive pin 44 are screwed into nuts for fixation. The end of the first drive pin 44 that passes through the first crank arm 43 is provided with a first pin joint 441. Specifically, the slot of the first connecting rod 26 can be assembled with the first pin joint 441 to facilitate the linkage between the flywheel transmission assembly 2 and the first crank arm drive assembly 4.

[0031] The second crank arm drive assembly 5 includes a second operating shaft 51, a second inner limiting arm 52 and a second crank arm 53 which are sequentially mounted and fixed on the second operating shaft 51, and a second drive pin 54 which passes through the upper part of the second inner limiting arm 52 and the upper part of the second crank arm 53 and is hinged to one end of the spring member 8. The two ends of the second drive pin 54 are screwed into nuts for fixation. The end of the second drive pin 54 that passes through the second crank arm 53 is provided with a second pin joint 541. Specifically, the slot of the second connecting rod 28 can be assembled with the second pin joint 541 to facilitate the linkage between the flywheel transmission assembly 2 and the second crank arm drive assembly 5.

[0032] The first limiting component 6 includes a first rectangular iron rod 61 fixedly installed on the assembly plate 1, a first limiting bolt 62 screwed vertically into the first rectangular iron rod 61 near the assembly plate 1, and a second limiting bolt 63 screwed laterally into the end of the first rectangular iron rod 61. Specifically, the first limiting bolt 62 is used to abut against the lower end of the first inner limiting arm 42 to limit the movement of the first crank arm drive component 4 when the three-position switch is in the grounding state, while the second limiting bolt 63 is used to abut against the upper end of the first crank arm 43 to limit the movement of the first crank arm drive component 4 when the three-position switch is in the closed state.

[0033] The second limiting assembly 7 includes a second rectangular iron rod 71 fixedly installed on the mounting plate 1, a third limiting bolt 72 screwed vertically into one end of the second rectangular iron rod 71 near the mounting plate 1, and a fourth limiting bolt 73 screwed laterally into the end of the second rectangular iron rod 71. Specifically, the third limiting bolt 72 is used to abut against the lower end of the second inner limiting arm 52 to restrict the movement of the second crank arm drive assembly 5 when the three-position switch is in the closed state, while the fourth limiting bolt 73 is used to abut against the upper end of the second crank arm 53 to restrict the movement of the second crank arm drive assembly 5 when the three-position switch is in the grounding state.

[0034] It should be further explained that the first limiting bolt 62 and the second limiting bolt 63 on the first rectangular iron rod 61, and the third limiting bolt 72 and the fourth limiting bolt 73 on the second rectangular iron rod 71, can be rotated and adjusted to adjust the screw-in length as needed. This controls the distance between the first inner limiting arm 42 and the first limiting bolt 62, the distance between the first crank arm 43 and the second limiting bolt 63, the distance between the second inner limiting arm 52 and the third limiting bolt 52, and the distance between the second crank arm 53 and the fourth limiting bolt 73. This allows for the adjustment of reasonable spacing between the aforementioned cooperating structures, which is more conducive to closing, opening, and grounding operations.

[0035] Referring to Figure 4, in the open state, neither the first crank arm drive assembly 4 nor the second crank arm drive assembly 5 rotates. The middle part of the slot of the first connecting rod 26 contacts the first pin joint 441, and the middle part of the slot of the second connecting rod 28 contacts the second pin joint 541. The spring 8 extends to both ends due to tension, pushing the first drive pin 44 and the second drive pin 54, causing the upper end of the first crank arm 43 to abut against the second limit bolt 63 and the upper end of the second crank arm 53 to abut against the fourth limit bolt 73, thus stabilizing the open state. In this state, the flywheel drive assembly 2 does not rotate under the drive of the first crank arm drive assembly 4 and the second crank arm drive assembly 5. At this time, the limit tooth 23 does not contact the limit plate 3.

[0036] Referring to Figure 5, when transitioning from the open state to the closed state, the second crank arm drive assembly 5 needs to rotate clockwise. After the second crank arm 53 disengages from the fourth limit bolt 73, it rotates clockwise simultaneously with the second inner limit arm 52 until the lower end of the second inner limit arm 52 abuts against the third limit bolt 72 and is blocked by the third limit bolt 72. Meanwhile, the first crank arm drive assembly 4 remains stationary due to the tension of the spring 8. Under the action of the spring 8, the upper end of the first crank arm 43 still abuts against the second limit bolt 63. In this state, the second inner limit arm 52 and the second crank arm 53 simultaneously drive the second drive pin 54 to move clockwise. Through the second pin joint 541, the second connecting rod 28 is pressed down, driving the flywheel plate 24 to rotate counterclockwise, which in turn drives the flywheel drive shaft 21 to rotate counterclockwise. At the same time, the limit tooth 23 contacts the right side of the limit plate 3 and is blocked by the limit plate 3, completing the transition from the open state to the closed state.

[0037] It should be further explained that when the circuit breaker changes from the open state to the closed state, the flywheel plate 24 is driven to rotate counterclockwise through the second connecting rod 28. Before the spring member 8 passes the dead point, the second pin joint 541 has already made contact with the end of the strip groove in the second connecting rod 28. The transmission process is seamless and does not produce impact motion. Frequent operation causes little wear on the groove.

[0038] Referring to Figure 6, when transitioning from the open state to the grounded state, the second crank arm drive assembly 4 needs to rotate counterclockwise. After the first crank arm 43 disengages from the second limit bolt 63, it rotates counterclockwise simultaneously with the first inner limit arm 42 until the lower end of the first inner limit arm 42 abuts against the first limit bolt 42 and is blocked and limited by the first limit bolt 42. Meanwhile, due to the tension of the spring member 8, the upper end of the second crank arm 53 still abuts against the fourth limit bolt 73 under the action of the spring member 8. In this state, the first inner limit arm 42 and the first crank arm 43 simultaneously drive the first drive pin 44 to move clockwise. Through the first pin joint 441, the first connecting rod 26 is pressed down to drive the flywheel plate 24 to rotate clockwise, which in turn drives the flywheel drive shaft 21 to rotate clockwise. At the same time, the limit tooth 23 contacts the left side of the limit plate 3 and is blocked by the limit plate 3, thus completing the transition from the open state to the grounded state.

[0039] It should be further explained that when the circuit breaker is switched from the open state to the ground state, the flywheel plate 24 is driven to rotate clockwise through the first connecting rod 26. Before the spring member 8 passes the dead point, the first pin joint 441 has already made contact with the end of the strip groove in the first connecting rod 26. The transmission process is seamless and does not produce impact movement. Frequent operation causes little wear on the groove.

[0040] The above embodiments of this utility model are not intended to limit the scope of protection of this utility model. The implementation of this utility model is not limited thereto. All other modifications, substitutions or alterations made to the above structure of this utility model based on the above content of this utility model and in accordance with the common technical knowledge and conventional means in the field, without departing from the basic technical idea of ​​this utility model, shall fall within the scope of protection of this utility model.

Claims

1. A transmission mechanism for a three-position switch, characterized in that, The assembly includes an assembly plate, a flywheel drive assembly installed at the lower center of the assembly plate, a limiting plate fixedly installed at the center of the assembly plate and operating in conjunction with the flywheel drive assembly, a first crank arm drive assembly installed on one side of the upper end of the assembly plate and linked by the flywheel drive assembly, a second crank arm drive assembly installed on the other side of the upper end of the assembly plate and linked by the flywheel drive assembly, a first limiting assembly installed on the assembly plate and operating in conjunction with the first crank arm drive assembly, a second limiting assembly installed on the assembly plate and operating in conjunction with the second crank arm drive assembly, and a spring component with one end movably mounted to the first crank arm drive assembly and the other end movably mounted to the second crank arm drive assembly.

2. The transmission mechanism of the three-position switch according to claim 1, characterized in that, The assembly plate has a first bearing housing installed at the part where the flywheel drive assembly is assembled, a second bearing housing installed at the part where the first crank arm drive assembly is assembled, and a third bearing housing installed at the part where the second crank arm drive assembly is assembled.

3. The transmission mechanism of the three-position switch according to claim 1, characterized in that, The flywheel drive assembly includes a flywheel drive shaft, a bushing fitted on the flywheel drive shaft, a limiting tooth integrally formed on the bushing and used in conjunction with a limiting plate to limit excessive rotation of the flywheel drive shaft, a flywheel plate fitted and fixed to the end of the flywheel drive shaft, a first hinge head fixedly installed on one side of the upper end of the flywheel plate, a first connecting rod with a groove on its upper end and fitted with the first hinge head at its lower end, a second hinge head fixedly installed on the other side of the upper end of the flywheel plate, and a second connecting rod with a groove on its upper end and fitted with the second hinge head at its lower end.

4. The transmission mechanism of the three-position switch according to claim 1, characterized in that, The limiting plate is an inverted Y-shaped limiting plate.

5. The transmission mechanism of the three-position switch according to claim 1, characterized in that, The first crank arm drive assembly includes a first operating shaft, a first inner limiting arm and a first crank arm that are sequentially mounted and fixed on the first operating shaft, a first drive pin that passes through the upper part of the first inner limiting arm and the upper part of the first crank arm and is hinged to one end of the spring, the two ends of the first drive pin are screwed into nuts for fixation, and the end of the first drive pin that passes through the first crank arm is provided with a first pin joint.

6. The transmission mechanism of the three-position switch according to claim 1, characterized in that, The second crank arm drive assembly includes a second operating shaft, a second inner limiting arm and a second crank arm that are sequentially mounted and fixed on the second operating shaft, a second drive pin that passes through the upper part of the second inner limiting arm and the upper part of the second crank arm and is hinged to one end of the spring, and nuts are screwed into both ends of the second drive pin for fixation, and a second pin joint is provided at one end of the second drive pin that passes through the second crank arm.

7. The transmission mechanism of the three-position switch according to claim 1, characterized in that, The first limiting component includes a first rectangular iron bar fixedly installed on the assembly plate, a first limiting bolt screwed vertically into one end of the first rectangular iron bar near the assembly plate, and a second limiting bolt screwed laterally into the end of the first rectangular iron bar.

8. The transmission mechanism of the three-position switch according to claim 1, characterized in that, The second limiting component includes a second rectangular iron bar that is fixedly installed on the assembly plate, a third limiting bolt that is screwed vertically into one end of the second rectangular iron bar near the assembly plate, and a fourth limiting bolt that is screwed laterally into the end of the second rectangular iron bar.

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