An overload protection device and overload protection method for an electric operating mechanism

Abstract

The present invention proposes an overload protection device and an overload protection method for an electric operating mechanism, comprising a side plate and a rotating member installed on the side plate, and also comprising a driving assembly, a claw assembly and a first spring, wherein a fixed shaft is arranged on the side plate, the claw assembly comprises a clamping end and a first spring connecting end, one end of the first spring is connected to the side plate, and the other end is connected to the first spring connecting end, the first spring applies a pulling force from the first spring connecting end to the clamping end on the claw assembly, and the claw assembly is provided with a driving connection position and a long hole, the long hole comprises an abnormal working end close to the clamping end and a normal working end close to the first spring connecting end, the fixed shaft is unimpededly penetrated in the long hole, and the driving assembly is connected to the driving connection position for driving the connection position to move in translation. The first spring and the driving mechanism are arranged to make the claw assembly contact and move away from the ratchet, thereby protecting the power system.

Description

Technical Field

[0001] The invention relates to low-voltage electrical equipment, and in particular to an overload protection system and an overload protection method for an energy storage type electric operator, which are used to protect the safety of a motor when the energy storage electric operator is working under overload. Background Art

[0002] Existing energy storage electric operating mechanisms are generally divided into two modes: manual and automatic. In manual mode, the energy storage mechanism is stored by manually operating the handle; in automatic mode, the energy storage mechanism is stored by the rotation of the motor. However, existing energy storage electric operating mechanism products do not have a device for protecting the electric energy storage structure, especially the motor, when the circuit breaker mechanism is in an abnormal state. When the circuit breaker mechanism is in an abnormal working state, the automatic energy storage structure cannot identify the state of the circuit breaker mechanism, which will cause the motor to overload or even stall, thereby rendering the electric operating mechanism ineffective.

[0003] Chinese invention patent application “Energy storage operating mechanism of circuit breaker” with application number 201610646933.7 and publication date of November 16, 2016 discloses an energy storage operating mechanism of circuit breaker, comprising two side plates, a drive shaft, an energy storage device, and a transmission assembly. The energy storage device comprises a cam assembly, an energy storage lever assembly, and a spring assembly. The energy storage lever assembly comprises two energy storage levers and a connecting shaft. The two energy storage levers are respectively mounted on the two side plates through two pins. The centers of the two pins are the rotation center A of the energy storage levers. The upper ends of the energy storage levers are connected to the connecting rods of the transmission assembly. The connection point between the energy storage levers and the connecting rods is the force point B of the energy storage levers. The spring assembly comprises a spring bracket, a large spring, and a small spring. One end of the spring bracket is connected to the lower end of the energy storage lever. The connection point between the spring bracket and the energy storage lever is the force application point C of the energy storage lever. The distance between the force application point C and the rotation center A is greater than the distance between the line L2 between the force point B and the rotation center A. The shortcoming of this circuit breaker is that no overload protection device is provided, which may cause safety hazards due to overload of the circuit breaker in actual use.

[0004] Patent No. 03131888.6, Chinese patent "Intelligentized Circuit Breaker Electric Operating Mechanism" published on August 31, 2005, discloses an intelligent circuit breaker electric operating mechanism, the output end of the motor is connected to the input end of the reducer, and its characteristics are: the reducer is composed of a central wheel with a ratchet, a planetary gear mechanism with an output shaft and a pawl, in which the planetary gear is mounted on the planetary frame, the output shaft (3) is mounted on the middle of the planetary frame, the planetary gear is meshed with the inner teeth of the central wheel, the planetary frame is provided with a boss, the pawl is provided with a ratchet and a connecting rod, the connecting rod is provided with a control boss and a control rod, the central wheel is concentric with the planetary frame and the output shaft, and a ratchet concentric with the central wheel is provided on one side end face of the central wheel. The ratchet is controlled by the connecting rod, and when the circuit breaker needs overload protection, the ratchet contacts the ratchet to prevent the ratchet from rotating, thereby protecting the circuit breaker. However, since the pawl stops the ratchet wheel from rotating through friction, the connecting rod control mechanism used in this invention is structurally unstable and the connecting rod is prone to breakage.

[0005] Therefore, it is necessary to design an overload protection device for an electric operating mechanism with a stable structure and convenient operation. Summary of the invention

[0006] The invention provides an overload protection device and an overload protection method for an electric operating mechanism. By arranging a first spring and a second spring, the contact and separation between a pawl assembly and a ratchet wheel are achieved, thereby protecting a power system.

[0007] An overload protection device for an electric operating mechanism comprises a side plate and a rotating part installed on the side plate, and also comprises a driving assembly, a claw assembly and a first spring, wherein a fixed shaft is arranged on the side plate, the claw assembly comprises a clamping end and a first spring connecting end, one end of the first spring is connected to the side plate, and the other end is connected to the first spring connecting end, the first spring applies a pulling force to the claw assembly from one side of the first spring connecting end to the other side of the clamping end, a driving connecting position and a long hole are arranged on the claw assembly, the long hole comprises an abnormal working end close to the clamping end and a normal working end close to the first spring connecting end, the fixed shaft is passed through the long hole without hindrance, and the driving assembly is connected to the driving connecting position for driving the connecting position to move in translation.

[0008] Preferably, the driving assembly includes a coil and a pull rod, wherein the coil is connected to the pull rod; when the coil is energized, the pull rod can be pulled, and the end of the pull rod is hinged to the driving connection position on the claw assembly.

[0009] Preferably, the pull rod is further provided with an open retaining ring and a pin, the end surface is provided with a third hole, and the open retaining ring and the third hole are coaxially connected via the pin.

[0010] Preferably, a tension spring shaft is provided on the side plate, a first hole is provided on the claw assembly above the long hole, one end of the second spring is connected to the first hole, and the other end is connected to the tension spring shaft.

[0011] Preferably, the claw assembly includes three sides, two corresponding sides are end sides, and the other side is the first spring connection end, on which the second hole is arranged, the long hole and the drive connection position are arranged on the end side, at least one first spring is arranged, and the number of the first springs is the same as the number of the second holes.

[0012] Preferably, the rotating member is a ratchet having a hollow portion, at least two planetary wheels being arranged on the periphery of the hollow portion, the inner sides of several of the planetary wheels being meshed and connected with external gears, and the outer sides of several of the planetary wheels being meshed and connected with internal gear assemblies.

[0013] Preferably, the external gear comprises a coaxially arranged large gear and a small gear, the small gear meshes with the inner sides of a plurality of the planetary gears, and a center hole is provided in the center of the large gear and the small gear.

[0014] Preferably, retaining frames are provided on both sides of the ratchet, and the retaining frames are hollow.

[0015] Preferably, the internal gear assembly comprises an internal gear and a central shaft, the internal gear is meshedly connected with the outer sides of several planetary gears on the ratchet; the central shaft passes through the central hole and the hollow part of the ratchet respectively.

[0016] The claw assembly is also provided with a second spring connection position, one end of the second spring is connected to the side plate, and the other end is connected to the second spring connection position.

[0017] An overload protection method for an electric operating mechanism, comprising:

[0018] Under normal working conditions, the pulling force of the first spring on the claw assembly causes the fixed shaft to be located at the normal working end of the long hole, and the driving assembly drives the driving connection position to move in a direction away from the connecting end of the first spring, and the claw assembly rotates around the fixed shaft, so that the engaging end of the claw assembly engages with the rotating member to limit the rotation of the rotating member, and the driving assembly stops after providing the pulling force, and no longer exerts force on the claw assembly;

[0019] In the abnormal working state, the thrust of the rotating part on the claw assembly is greater than the pulling force of the first spring. The claw assembly rotates so that the fixed shaft is located at the abnormal working end of the long hole, the engaging end of the claw assembly is disengaged from the rotating part, and the pulling force of the first spring causes the fixed shaft to return to the normal working end of the long hole. Since the driving assembly has no force on the driving connection position of the claw assembly, the claw assembly and the rotating part are in a non-contact state.

[0020] Beneficial Effects

[0021] The present invention has a simple structure, and by providing a first spring and a driving mechanism, the pawl assembly is brought into contact with and away from the ratchet, thereby protecting the power system. The overall structure is simple and efficient, and the maintenance cost is low. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of the combined state of an overload protection device of an electric operating mechanism;

[0023] Figure 2 It is an exploded diagram of an overload protection device of an electric operating mechanism;

[0024] Figure 3 is a schematic diagram of an internal gear assembly;

[0025] Figure 4 is a schematic diagram of a planetary gear assembly;

[0026] Figure 5 is a schematic diagram of an internal gear assembly;

[0027] Figure 6 is a schematic diagram of a side panel assembly;

[0028] Figure 7 It is a schematic diagram of the drive components;

[0029] Figure 8 is a schematic diagram of the claw assembly;

[0030] Fig. 9 is a schematic diagram of the first position of the claw assembly;

[0031] Fig.10 This is a schematic diagram of the second position of the claw assembly.

[0032] The meanings of the numbers in the figure are: 01 external gear, 02 planetary gear assembly, 03 internal gear assembly, 04 side plate assembly, 05 driving assembly, 06 first spring, 07 claw assembly, 08 second spring;

[0033] 01 External gear: 0101 large gear, 0102 small gear, 0103 center hole;

[0034] 02 planetary gear assembly: 0201 ratchet, 0202 planetary gear, 0203 cage;

[0035] 03 internal gear assembly: 0301 internal gear, 0302 center shaft;

[0036] 04 side panel assembly: 0401 side panel, 0402 tension spring shaft, 0403 fixed shaft;

[0037] 05 driving components: 0501 coil, 0502 pull rod, 0503 pin, 0504 open retaining ring;

[0038] 07 claw assembly: 0701 end face, 0702 groove, 0703 first hole, 0704 second hole, 0705 third hole. DETAILED DESCRIPTION

[0039] like Figure 1 and Figure 2 The figure shows the overall structure diagram and exploded view of an overload protection device for an electric operating mechanism. An overload protection device for an electric operating mechanism comprises an outer gear 01, a planetary gear assembly 02, an inner gear assembly 03, a side plate assembly 04, a drive assembly 05 and a claw assembly 07, wherein the outer gear 01, the planetary gear assembly 02 and the inner gear assembly 03 are meshed and connected in sequence.

[0040] like Figure 3 The external gear 01 includes a large gear 0101 and a small gear 0102 which are coaxially combined, and a center hole 0103 which is arranged at the center of the circle.

[0041] like Figure 4 The planetary gear assembly 02 includes a ratchet 0201 and a retaining frame 0203 disposed on both sides of the ratchet 0201. The ratchet 0201 is provided with three planetary gears 0202. The ratchet 0201 and the retaining frame 0203 are hollow. The gears of the three planetary gears 0202 are meshed and connected with the pinion 0102 on the outer gear 01.

[0042] like Figure 5 The internal gear assembly 03 includes an internal gear 0301 and a central shaft 0302 disposed at the center of the internal gear assembly 03 .

[0043] like Figure 6 The side plate assembly 04 includes a side plate 0401 and a tension spring shaft 0402 and a fixed shaft 0403 disposed on the side plate 0401, and is also provided with a through hole allowing the central shaft 0302 to pass through.

[0044] When in use, the central shaft 0302 passes through the central hole 0103 on the outer gear 01, the hollow part of the retaining frame 0203 and the ratchet 0201, and finally passes through the through hole on the side plate assembly 04 to achieve the connection between the outer gear 01, the planetary gear assembly 02, the inner gear assembly 03, and the side plate assembly 04. At this time, the pinion 0102 is meshed with the inner side of the three planetary gears 0202, and the outer side of the three planetary gears 0202 is meshed and connected with the inner gear 0301. The power transmission is as follows: the upper transmission gear (not shown in the figure) meshes and rotates with the large gear 0101, driving the pinion 0102 to rotate coaxially, thereby driving the three planetary gears 0202 to rotate, causing the inner gear 0301 to rotate, and finally transmitting the power to the central shaft 0302 to connect with the lower gear.

[0045] like Figure 7 The figure shows a schematic diagram of a driving component. The driving component 05 includes a coil 0501, a pull rod 0502 connected to the coil 0501, an open retaining ring 0504 and a pin 0503 are arranged on the other side of the pull rod 0502, and the pin 0503 can pass through the open retaining ring 0504. The coil 0501 is an electromagnet. When receiving an external closing signal, the electromagnet is energized to push the pull rod 0502 to move to one side.

[0046] like Figure 8 As shown, it is a schematic diagram of the claw assembly. The claw assembly 07 is composed of three surfaces, wherein the corresponding two surfaces are end surfaces 0701, and the other surface is provided with a second hole 0704. The two end surfaces 0701 are provided with grooves 0702 of the same size and position, a third hole 0705 is provided at the bottom of one end surface 0701, and a first hole 0703 is provided on the other end surface 0701. The fixed shaft 0403 passes through the grooves 0702 on the two end surfaces 0701 so that the side plate assembly 04 and the claw assembly 07 are connected, and the pin shaft 0503 passes through the open retaining ring 0504 and the third hole 0705 so that the driving assembly 05 and the claw assembly 07 are connected. One side of the second spring 08 is connected to the 0402 tension spring shaft, and the other side is connected to the 0703 first hole. One side of the first spring 06 is connected to the 0704 second hole, and the other side is connected to the 0403 fixed shaft. The distance between the two end surfaces 0701 is equal to that of the ratchet 0201.

[0047] like Fig. 9 The above is a schematic diagram of the first position of the claw assembly. At this time, it is a normal working state. Without the influence of external force, due to the pulling force of the first spring 06, the claw assembly 07 always maintains a tendency to approach the fixed shaft 0403, so that the fixed shaft 0403 slides to the rightmost end through the groove 0702. The driving assembly 05 drives the pull rod 0502 to move away from the second hole 0704, so that the claw assembly 07 rotates clockwise around the fixed shaft 0403, and the end surface 0701 contacts the ratchet 0201, limiting the rotation of the ratchet 0201. The driving assembly 05 only provides an initial pulling force, and then stops the action. At this time, the driving assembly 05 has no force on the claw assembly 07.

[0048] like Fig.10The figure shows a schematic diagram of the second position of the claw assembly. This is an abnormal working state. When the system is in an overload state, the central shaft 0302 provides a large resistance, so that the ratchet 0201 provides a large thrust to the claw assembly 07. The thrust is greater than the pulling force of the first spring 06, so that the fixed shaft 0403 slides to the end of the slot 0702 away from the second hole 0702, so that the claw assembly 07 rotates counterclockwise, so that the end surface 0701 and the ratchet 0201 are in a non-contact state. Subsequently, due to the pulling force of the first spring 06, the fixed shaft 0403 returns to the end of the slot 0702 close to the second hole 0704, but because there is no force from the driving assembly 05, the claw assembly 07 and the ratchet 0201 are in a non-contact state. At this time, the planetary gear assembly 02 is in a free state, and the power transmitted to the planetary gear assembly 02 by the outer gear 01 makes the planetary gear assembly 02 rotate as a whole around the central axis 0302, and the power cannot be transmitted to the inner gear 0301. Therefore, the upper transmission mechanism is no longer subject to the large resistance provided by the central axis 0302, thereby achieving protection of the power system.

[0049] An overload protection method for an electric operating mechanism, comprising:

[0050] Under normal working conditions, the pulling force of the first spring on the claw assembly 07 causes the fixed shaft 0403 to be located at the normal working end of the long hole, and the driving assembly 05 drives the driving connection position to move in a direction away from the first spring connection end, and the claw assembly 07 rotates around the fixed shaft 0403, so that the engaging end of the claw assembly 07 engages with the rotating part to limit the rotation of the rotating part. After providing this pulling force, the driving assembly 05 stops moving and no longer exerts force on the claw assembly 07;

[0051] In the abnormal working state, the thrust of the rotating part on the claw assembly 07 is greater than the pulling force of the first spring 06. The claw assembly 07 rotates to make the fixed shaft 0403 located at the abnormal working end of the long hole, and the engaging end of the claw assembly 07 is disengaged from the rotating part. The pulling force of the first spring 06 causes the fixed shaft 0403 to return to the normal working end of the long hole. Since the driving assembly 05 has no force on the driving connection position of the claw assembly 07, the claw assembly 07 and the rotating part are in a non-contact state.

[0052] The present invention is used in the energy storage type electric operating mechanism of 250A / 630A frame molded case circuit breakers, and can also adjust the spring force value to adjust the working range of the electric operating mechanism, and is suitable for the electric operating mechanisms of other circuit breakers.

Claims

1. An overload protection device for an electric operating mechanism, comprising a side plate (0401) and a rotating member mounted on the side plate (0401), characterized in that: The invention also comprises a driving component (05), a claw component (07) and a first spring (06); a fixed shaft (0403) is arranged on the side plate (0401); the claw component (07) comprises a locking end and a first spring connection end; one end of the first spring (06) is connected to the side plate (0401), and the other end is connected to the first spring connection end; the first spring (06) applies a pulling force from the first spring connection end to the locking end on the claw component (07); a driving connection position and a long hole are arranged on the claw component (07); the long hole comprises an abnormal working end close to the locking end and a normal working end close to the first spring connection end; the fixed shaft (0403) is unimpededly inserted into the long hole; the driving component (05) is connected to the driving connection position for driving the connection position to move in translation; in a normal working state, the pulling force of the first spring (06) on the claw component (07) causes the fixed shaft (0403) to move in a straight line. 3) located at the normal working end of the long hole, the driving component (05) drives the driving connection position to move in a direction away from the first spring connection end, and the claw component (07) rotates around the fixed shaft (0403), so that the engaging end of the claw component (07) engages with the rotating member to limit the rotation of the rotating member, and the driving component (05) stops moving after providing the pulling force, and no longer exerts force on the claw component (07); in an abnormal working state, the thrust of the rotating member on the claw component (07) is greater than the pulling force of the first spring (06), the claw component (07) rotates so that the fixed shaft (0403) is located at the abnormal working end of the long hole, the engaging end of the claw component (07) is disengaged from the rotating member, and the pulling force of the first spring (06) causes the fixed shaft (0403) to return to the normal working end of the long hole. Since the driving component (05) has no force on the driving connection position of the claw component (07), the claw component (07) and the rotating member are in a non-contact state.

2. The overload protection device according to claim 1, characterized in that: The driving component (05) comprises a coil (0501) and a pull rod (0502), wherein the coil (0501) is connected to the pull rod (0502); when the coil (0501) is energized, the pull rod (0502) can be pulled, and the end of the pull rod (0502) is hinged to the driving connection position on the claw component (07).

3. The overload protection device according to claim 2, characterized in that: A tension spring shaft (0402) is provided on the side plate (0401), a first hole (0703) is provided on the claw assembly (07) above the long hole, one end of the second spring (08) is connected to the first hole (0703), and the other end is connected to the tension spring shaft (0402).

4. The overload protection device according to claim 2, characterized in that: The claw assembly (07) comprises three surfaces, two corresponding surfaces being end surfaces (0701), and the other surface being the first spring connection end, on which a second hole (0704) is arranged, and the end surface (0701) is provided with the long hole and the drive connection position, and at least one first spring (06) is provided, and the number of the first springs (06) is the same as the number of the second holes (0704).

5. The overload protection device according to claim 4, characterized in that: The pull rod (0502) is also provided with an open retaining ring (0504) and a pin shaft (0503), and the end surface (0701) is provided with a third hole (0705), and the open retaining ring (0504) and the third hole (0705) are coaxially connected via the pin shaft (0503).

6. The overload protection device according to claim 1, characterized in that: The rotating member is a ratchet (0201), the ratchet (0201) is provided with a hollow portion, at least two planetary gears (0202) are provided on the periphery of the hollow portion, the inner sides of a plurality of the planetary gears (0202) are meshedly connected to the outer gear (01), and the outer sides of a plurality of the planetary gears (0202) are meshedly connected to the inner gear assembly (03).

7. The overload protection device according to claim 6, characterized in that: The external gear (01) comprises a large gear (0101) and a small gear (0102) which are coaxially arranged, the small gear (0102) meshing with the inner sides of a plurality of the planetary gears (0202), and a center hole (0103) is arranged at the center of the large gear (0101) and the small gear (0102).

8. The overload protection device according to claim 7, characterized in that: Retaining frames (0203) are also provided on both sides of the ratchet (0201), and the retaining frames (0203) are hollow.

9. The overload protection device according to claim 7, characterized in that: The internal gear assembly (03) comprises an internal gear (0301) and a central shaft (0302), wherein the internal gear (0301) is meshedly connected with the outer sides of a plurality of the planetary gears (0202) on the ratchet (0201); the central shaft (0302) passes through the central hole (0103) and the hollow part of the ratchet (0201) respectively; a second spring connection position is also provided on the pawl assembly (07), and one end of the second spring (08) is connected to the side plate (0401), and the other end is connected to the second spring connection position.

10. A method for overload protection of an electric operating mechanism using the overload protection device according to any one of claims 1 to 9, comprising: In a normal working state, the pulling force exerted by the first spring on the claw assembly (07) causes the fixed shaft (0403) to be located at the normal working end of the long hole, and the driving assembly (05) drives the driving connection position to move in a direction away from the first spring connection end, and the claw assembly (07) rotates around the fixed shaft (0403), so that the engaging end of the claw assembly (07) engages with the rotating part to limit the rotation of the rotating part, and the driving assembly (05) stops moving after providing the pulling force, and no longer exerts force on the claw assembly (07); in a non-operating state, the driving assembly (05) stops moving after providing the pulling force, and no longer exerts force on the claw assembly (07); In a normal working state, the thrust of the rotating member on the claw assembly (07) is greater than the pulling force of the first spring (06), the claw assembly (07) rotates so that the fixed shaft (0403) is located at the abnormal working end of the long hole, the engaging end of the claw assembly (07) is disengaged from the rotating member, and the pulling force of the first spring (06) causes the fixed shaft (0403) to return to the normal working end of the long hole. Since the driving assembly (05) has no force acting on the driving connection position of the claw assembly (07), the claw assembly (07) and the rotating member are in a non-contact state.

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