Double force spring operating mechanism

Abstract

The present invention relates to a double-force spring operating mechanism, comprising a mechanism frame, a spring energy storage drive assembly, and a connecting rod transmission assembly, wherein the connecting rod transmission assembly comprises a transmission crank arm, an output crank arm rotatably arranged on the mechanism frame, a connecting plate, a circuit breaker main shaft, and a double-force connecting rod group, wherein the double-force connecting rod group comprises a bracket, a main shaft crank arm linked with the circuit breaker main shaft, a driving push rod, a top push rod, and an output push rod for driving a vacuum circuit breaker to execute closing, wherein one end of the driving push rod is rotatably arranged on the top push rod and one end of the output push rod, and the other end of the driving push rod is rotatably arranged on the main shaft crank arm, the other end of the top push rod is rotatably arranged on the bracket, and the other end of the output push rod is rotatably arranged on the vacuum interrupter of the vacuum circuit breaker, and the moving conductive rod of the vacuum interrupter moves with the output push rod, and the closing of the vacuum circuit breaker can be realized. The present invention has the advantages of simple structure, stable and reliable performance, small size, rapid closing, and low cost.

Description

Technical Field

[0001] The invention relates to a spring operating mechanism, in particular to a multi-force spring operating mechanism. Background Art

[0002] The spring operating mechanism is an important component of the vacuum circuit breaker and is used to control the on and off of the circuit. The spring operating mechanism is an operating mechanism that uses a spring as a power element to perform opening and closing operations on the vacuum circuit breaker. It can well meet the power coordination characteristics required by the vacuum circuit breaker and has reliable working performance. The existing spring operating mechanism includes a mechanism frame, a spring energy storage component arranged on the mechanism frame, and a connecting rod component arranged between the vacuum arc extinguishing chamber and the spring energy storage component. The closing rotation stroke of the output crank arm used to output the closing energy on the existing spring operating mechanism is 80° to 120°, the closing movement stroke is large, the closing is not fast enough, and the closing movement stroke of the output crank arm is too long, and the output crank arm is easy to consume part of the closing energy released by the spring energy storage drive component, so that the closing output energy of the spring operating mechanism is small, which can only meet the use requirements of the vacuum circuit breaker with a rated current of 630A, but cannot meet the use requirements of the vacuum circuit breaker with a larger rated current. However, at present, most of the existing spring operating mechanisms used on vacuum circuit breakers with a rated current of 1250A have a relatively complex structural design, a relatively large volume, and a high cost. Therefore, it is very necessary to design a spring operating mechanism with large closing output force, simple structure and low cost. Summary of the invention

[0003] The purpose of the present invention is to overcome the defects of the prior art and provide a multiplier spring operating mechanism with simple structure, stable and reliable performance, small size, rapid closing and low cost.

[0004] To achieve the above-mentioned purpose, the present invention adopts a double-force spring operating mechanism, including a mechanism frame, a spring energy storage drive assembly arranged on the mechanism frame, and a connecting rod transmission assembly that cooperates with the spring energy storage drive assembly and is used to drive the vacuum circuit breaker to perform a closing operation. The connecting rod transmission assembly includes a transmission crank arm that is rotatably arranged on the mechanism frame and cooperates with the spring energy storage drive assembly, an output crank arm that is rotatably arranged on the mechanism frame, a connecting plate that is arranged between the transmission crank arm and the output crank arm, a circuit breaker main shaft that cooperates with the output crank arm, and a double-force connecting rod that is arranged on the vacuum circuit breaker and cooperates with the circuit breaker main shaft. The double-force connecting rod group includes a bracket arranged on the vacuum circuit breaker, a main shaft crank arm linked with the main shaft of the circuit breaker, a driving push rod, a top push rod, and an output push rod for driving the vacuum circuit breaker to execute closing. One end of the driving push rod is rotatably arranged on the top push rod and one end of the output push rod, the other end of the driving push rod is rotatably arranged on the main shaft crank arm, the other end of the top push rod is rotatably arranged on the bracket, and the other end of the output push rod is rotatably arranged on the vacuum interrupter of the vacuum circuit breaker, and the moving conductive rod of the vacuum interrupter moves with the output push rod, and the closing of the vacuum circuit breaker can be realized.

[0005] The beneficial effect of the above structure is that: the spring operating mechanism is provided with a double-force connecting rod group, and when the connecting rod transmission assembly is used in conjunction with the spring energy storage drive assembly, the connecting rod transmission assembly can multiply the closing energy output by the spring energy storage drive assembly and act on the moving conductive rod of the vacuum interrupter, and the use requirements of the large current vacuum circuit breaker can be met without increasing the closing output energy of the spring energy storage drive assembly. The connecting rod transmission assembly has a simple structural design and lower cost. The closing rotation angle of the output crank arm is 40°, the closing movement stroke is short, and the initial release energy of the spring energy storage drive assembly is the peak energy, so that the peak energy of the spring energy storage drive assembly can be quickly released on the main shaft of the circuit breaker, so that the main shaft of the short circuit can rotate quickly, which is conducive to improving the closing speed, and the top push rod and the output push rod of the double-force connecting rod group can increase the closing energy output by the main shaft of the circuit breaker to twice and act on the output push rod, thereby realizing the double-force output of the closing energy of the spring operating mechanism. Therefore, the spring operating mechanism has the advantages of simple structure, stable and reliable performance, small size, rapid closing and low cost.

[0006] In particular, the transmission crank arm is provided with a first connecting arm, a second connecting arm and a third connecting arm respectively, the first connecting arm is rotatably provided on one end of the connecting plate, the second connecting arm is provided with a closing roller matched with the cam of the spring energy storage drive assembly, and forms a linkage match between the transmission crank arm and the cam, the third connecting arm is rotatably provided with a switch-off roller matched with the switch-off rotating shaft, and forms a linkage match between the transmission crank arm and the switch-off rotating shaft. The transmission crank arm is provided with a closing roller matched with the cam of the spring energy storage output assembly, and the transmission between the cam and the transmission crank arm is more reliable, which is conducive to improving the reliability of the operation of the spring operating mechanism.

[0007] In particular, a hexagonal snap-fit ​​hole is provided on one end of the output crank arm, the cross-sectional shape of the circuit breaker main shaft is a regular hexagonal shape, one end of the circuit breaker main shaft is snap-fitted into the hexagonal snap-fit ​​hole and forms a linkage fit between the output crank arm and the circuit breaker main shaft, and the other end of the circuit breaker main shaft is inserted into the bearing on the bracket and forms a rotational connection fit between the circuit breaker main shaft and the bracket. The output crank arm and the circuit breaker main shaft are connected by snap-fitting, which facilitates the assembly of the output crank arm and the circuit breaker main shaft, and is conducive to improving the assembly efficiency of the spring operating mechanism.

[0008] In particular, the other end of the output push rod has a U-shaped connecting ear plate, the U-shaped connecting ear plate is provided with a fixing hole, the moving conductive rod of the vacuum interrupter is provided with a connecting hole, the fixing hole and the connecting hole are provided with a pin shaft, and needle bearings are provided at both ends of the pin shaft, and a guide groove is provided at the corresponding needle bearing on the bracket, and the needle bearing moves with the pin shaft and can slide back and forth in the guide groove. The guide groove is provided on the bracket to ensure that the transmission between the output push rod and the moving conductive rod of the vacuum interrupter is more reliable, and the pin shaft is provided with a needle bearing matched with the guide groove, and the needle bearing has a higher load bearing capacity, which is conducive to extending the service life of the spring operating mechanism.

[0009] In particular, a fixed support foot is provided on each side of the bracket, and each fixed support foot is provided with a through hole, and a fastener connected to the vacuum circuit breaker is provided in the through hole. The fixed support foot connected to the vacuum circuit breaker is provided on the bracket, and the connection between the bracket and the vacuum circuit breaker is more firm, which is conducive to improving the reliability of the transmission between the output push rod and the moving conductive rod of the vacuum interrupter. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a stereogram of an embodiment of the present invention.

[0011] Figure 2 It is a front view of the internal structure of an embodiment of the present invention.

[0012] Figure 3It is an assembly diagram of the double force connecting rod group and the vacuum interrupter according to an embodiment of the present invention.

[0013] Figure 4 for Figure 3 sectional view of .

[0014] Figure 5 Output a stereogram of the crank arm according to an embodiment of the present invention. DETAILED DESCRIPTION

[0015] like Figures 1 to 5 As shown, the embodiment of the present invention is a double-force spring operating mechanism, including a mechanism frame 10, a spring energy storage drive assembly 11 arranged on the mechanism frame 10, and a connecting rod transmission assembly 20 that cooperates with the spring energy storage drive assembly 11 and is used to drive the vacuum circuit breaker to perform any closing operation. The connecting rod transmission assembly 20 includes a transmission crank arm 21 that is rotatably arranged on the mechanism frame 10 and cooperates with the spring energy storage drive assembly 11, an output crank arm 22 that is rotatably arranged on the mechanism frame 10, a connecting plate 23 that is arranged between the transmission crank arm 21 and the output crank arm 22, a circuit breaker main shaft 24 that cooperates with the output crank arm 22, and a double-force connecting rod group 30 that is arranged on the vacuum circuit breaker and cooperates with the circuit breaker main shaft 24. The force-doubler connecting rod assembly 30 includes a bracket 31 arranged on the vacuum circuit breaker, a main shaft arm 32 that cooperates with the main shaft 24 of the circuit breaker, a driving push rod 33, a top push rod 34, and an output push rod 35 for driving the vacuum circuit breaker to execute closing. One end of the driving push rod 33 is rotatably arranged on one end of the top push rod 34 and the output push rod 35, the other end of the driving push rod 33 is rotatably arranged on the main shaft arm 32, the other end of the top push rod 34 is rotatably arranged on the bracket 31, and the other end of the output push rod 35 is rotatably arranged on the vacuum arc chamber 26 of the vacuum circuit breaker, and the moving conductive rod 261 of the vacuum arc chamber 26 moves with the output push rod 35, and the closing of the vacuum circuit breaker can be realized. Figure 1 and 2 As shown, the transmission crank arm 21 is respectively provided with a first connecting arm 211, a second connecting arm 212, and a third connecting arm 213. The first connecting arm 211 is rotatably provided on one end of the connecting plate 23. The second connecting arm 212 is provided with a closing roller 214 that matches the cam 111 of the spring energy storage drive assembly 11, and forms a linkage match between the transmission crank arm 21 and the cam 111. The third connecting arm 213 is rotatably provided with a closing roller 215 that matches the opening rotating shaft 12, and forms a linkage match between the transmission crank arm 21 and the opening rotating shaft 12. The transmission crank arm is provided with a closing roller that matches the cam of the spring energy storage output assembly, and the transmission between the cam and the transmission crank arm is more reliable, which is conducive to improving the reliability of the operation of the spring operating mechanism.

[0016] like Figure 1 , 3As shown in Figures 5 and 6, a hexagonal snap-fit ​​hole 221 is provided on one end of the output crank arm 22, and the cross-sectional shape of the circuit breaker main shaft 24 is a regular hexagonal shape. One end of the circuit breaker main shaft 24 is snap-fitted into the hexagonal snap-fit ​​hole 221 and forms a linkage fit between the output crank arm 22 and the circuit breaker main shaft 24, and the other end of the circuit breaker main shaft 24 is inserted into the bearing 311 on the bracket 31 and forms a rotational connection fit between the circuit breaker main shaft 24 and the bracket 31. The output crank arm and the circuit breaker main shaft are connected by snap-fitting, which is convenient for assembling the output crank arm and the circuit breaker main shaft, and is conducive to improving the assembly efficiency of the spring operating mechanism. The output push rod 35 has a U-shaped connecting ear plate 351 at the other end, and a fixing hole is provided on the U-shaped connecting ear plate 351. The moving conductive rod 261 of the vacuum interrupter 26 is provided with a connecting hole 262. A pin 36 is provided in the fixing hole and the connecting hole 262, and needle bearings 37 are provided at both ends of the pin 36. A guide groove 312 is provided at the position corresponding to the needle bearing 37 on the bracket 31. The needle bearing 37 moves with the pin 36 and can slide back and forth in the guide groove 312. The guide groove is provided on the bracket to ensure that the transmission between the output push rod and the moving conductive rod of the vacuum interrupter is more reliable, and the pin is provided with a needle bearing matched with the guide groove. The needle bearing has a high load bearing capacity, which is conducive to extending the service life of the spring operating mechanism. A fixed support foot 313 is provided on both sides of the bracket 31, and each fixed support foot 313 is provided with a through hole 314. A fastener connected to the vacuum circuit breaker is provided in the through hole 314. The fixed support foot connected to the vacuum circuit breaker is provided on the bracket, and the connection between the bracket and the vacuum circuit breaker is more firm, which is conducive to improving the reliability of the transmission between the output push rod and the moving conductive rod of the vacuum interrupter.

[0017] The spring operating mechanism is provided with a double-force connecting rod group. When the connecting rod transmission assembly is used in conjunction with the spring energy storage drive assembly, the connecting rod transmission assembly can multiply the closing energy output by the spring energy storage drive assembly and act on the moving conductive rod of the vacuum arc chamber. There is no need to increase the closing output energy of the spring energy storage drive assembly to meet the use requirements of high-current vacuum circuit breakers. The connecting rod transmission assembly has a simple structural design and lower cost. The closing rotation angle of the output crank arm is 40°, and the closing movement stroke is short. The initial release energy of the spring energy storage drive assembly is the peak energy, so that the peak energy of the spring energy storage drive assembly can be quickly released on the main shaft of the circuit breaker, so that the main shaft of the short circuit breaker can rotate quickly, which is beneficial to increase the closing speed. The push rod and output push rod of the double-force connecting rod group can increase the closing energy output by the main shaft of the circuit breaker to twice and act on the output push rod, thereby realizing the double-force output of the closing energy of the spring operating mechanism. Therefore, the spring operating mechanism has the advantages of simple structure, stable and reliable performance, small size, fast closing and low cost. Figure 2 and4 As shown, when the spring operating mechanism is working, the spring energy storage drive assembly drives the transmission crank arm to move, the transmission crank arm drives the output crank arm to rotate (rotate 40°) through the connecting plate, the output crank arm drives the circuit breaker main shaft to rotate, the circuit breaker main shaft drives the main shaft crank arm to move, the main shaft crank arm drives the driving push rod to move (force F1), the driving push rod simultaneously drives the top push rod and the output push rod to move, at this time, the forces of the driving push rod and the top push rod are all released on the output push rod (F2), the push rod drives the moving conductive rod of the vacuum interrupter to perform the closing action, which can realize the exponential increase and release of the closing output energy of the circuit breaker main shaft, which is beneficial to improve the closing output force of the spring operating mechanism.

Claims

1. A multi-force spring operating mechanism, comprising a mechanism frame, a spring energy storage drive assembly arranged on the mechanism frame, and a connecting rod transmission assembly that cooperates with the spring energy storage drive assembly and is used to drive a vacuum circuit breaker to perform a closing operation, characterized in that: The connecting rod transmission assembly includes a transmission crank arm rotatably arranged on the mechanism frame and linked with the spring energy storage drive assembly, an output crank arm rotatably arranged on the mechanism frame, a connecting plate arranged between the transmission crank arm and the output crank arm, a circuit breaker main shaft linked with the output crank arm, and a double-force connecting rod group arranged on the vacuum circuit breaker and linked with the circuit breaker main shaft. The closing rotation angle of the output crank arm is 40°. The double-force connecting rod group includes a bracket arranged on the vacuum circuit breaker, a main shaft crank arm linked with the circuit breaker main shaft, a driving push rod, a top push rod, and an output push rod for driving the vacuum circuit breaker to perform closing. One end of the driving push rod is rotatably arranged on the top push rod and one end of the output push rod, the other end of the driving push rod is rotatably arranged on the main shaft crank arm, the other end of the top push rod is rotatably arranged on the bracket, and the other end of the output push rod is rotatably arranged on the vacuum arc extinguishing chamber of the vacuum circuit breaker. The moving conductive rod of the vacuum arc extinguishing chamber moves with the output push rod, and the closing of the vacuum circuit breaker can be realized.

2. The multiplier spring operating mechanism according to claim 1, characterized in that: The transmission crank arm is respectively provided with a first connecting arm, a second connecting arm and a third connecting arm. The first connecting arm is rotatably arranged on one end of the connecting plate. The second connecting arm is provided with a closing roller which cooperates with the cam of the spring energy storage drive assembly, and constitutes a linkage cooperation between the transmission crank arm and the cam. The third connecting arm is rotatably provided with an opening roller which cooperates with the opening rotating shaft, and constitutes a linkage cooperation between the transmission crank arm and the opening rotating shaft.

3. The multiplier spring operating mechanism according to claim 1 or 2, characterized in that: A hexagonal snap-in hole is provided on one end of the output crank arm, and the cross-sectional shape of the circuit breaker main shaft is a regular hexagon. One end of the circuit breaker main shaft is snap-fitted into the hexagonal snap-in hole to form a linkage fit between the output crank arm and the circuit breaker main shaft, and the other end of the circuit breaker main shaft is inserted into the bearing on the bracket to form a rotational connection fit between the circuit breaker main shaft and the bracket.

4. The multiplier spring operating mechanism according to claim 1 or 2, characterized in that: The other end of the output push rod is provided with a U-shaped connecting ear plate, a fixing hole is arranged on the U-shaped connecting ear plate, a connecting hole is arranged on the moving conductive rod of the vacuum arc extinguishing chamber, a pin is arranged in the fixing hole and the connecting hole, and needle bearings are arranged at both ends of the pin respectively, a guide groove is arranged on the bracket corresponding to the needle bearing, and the needle bearing moves with the pin and can slide back and forth in the guide groove.

5. The multiplier spring operating mechanism according to claim 1 or 2, characterized in that: A fixed support foot is respectively arranged on both sides of the bracket, and each fixed support foot is respectively provided with a through hole, and a fastener connected with the vacuum circuit breaker is arranged in the through hole.

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