Novel electric actuating mechanism

Abstract

The utility model provides a novel electric actuating mechanism which comprises a box body, a speed reducing mechanism arranged in the box body, and an electric driving mechanism and a manual operating mechanism which are respectively connected with the speed reducing mechanism, the speed reducing mechanism comprises a main shaft arranged in the box body, a first-stage sun gear and a second-stage sun gear which are rotationally arranged on the main shaft respectively, a planet carrier rotationally arranged on the outer side of the main shaft, a first-stage planet gear and a second-stage planet gear which are rotationally arranged on the two sides of the planet carrier respectively, and a gear ring meshed with the first-stage planet gear and the second-stage planet gear respectively. According to the novel electric actuating mechanism, the first check block and the second check block are arranged at the two ends of the first worm, the first spring is arranged between the first check block and the first worm, the second spring is arranged between the second check block and the first worm, and the first worm can move up and down through the arrangement of the first spring and the second spring; therefore, stress concentration between the gear ring and the first worm caused by continuous screwing of the hand wheel is buffered, and the gear ring and the worm wheel are buffered and protected together.

Description

Technical Field

[0001] The utility model relates to the technical field of electric actuators, in particular to a novel electric actuator. Background Art

[0002] An electric actuator is a mechanism that converts electrical energy into mechanical energy to drive a mechanical device. It is commonly used for opening and closing valve mechanisms and controlling the size of the opening. Current valve electric actuators are equipped with an electric drive mechanism and a manual operating mechanism. In order to change the working conditions, they are often equipped with a manual-electric switching mechanism. When in the electric drive state, the internal clutch is switched to the manual operation state through the manual-electric switching mechanism. If the current state is manual operation, the switching mechanism switches to the electric drive position. The manual-electric conversion is time-consuming and labor-intensive. As a result, an electric actuator has emerged on the market that can switch between the electric drive mechanism and the manual operating mechanism without a manual-electric switching mechanism. When the motor stops running, manual operation can be performed by directly rotating the handwheel. When manual operation is not required, the electric drive mechanism can be operated by directly starting the motor.

[0003] However, when the electric drive mechanism of the existing electric actuator is directly started, it has a large impact on the manual operating mechanism in the box, thereby reducing the service life of the electric actuator. This solution solves this technical problem. Utility Model Content

[0004] In view of the deficiencies in the prior art, the utility model provides a novel electric actuator.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the utility model is as follows: a new type of electric actuator, including a housing, a reduction mechanism arranged in the housing, an electric drive mechanism and a manual operating mechanism respectively connected to the reduction mechanism, the reduction mechanism including a main shaft arranged in the housing, a primary sun gear and a secondary sun gear respectively rotatably arranged on the main shaft, a planet carrier rotatably arranged outside the main shaft, a primary planet gear and a secondary planet gear respectively rotatably arranged on both sides of the planet carrier, and a gear ring respectively meshed with the primary planet gear and the secondary planet gear, a number of the primary planet gears are meshed with the primary sun gear, the planet carrier is connected to one end of the secondary sun gear, a number of the secondary planet gears are meshed with the secondary sun gear, the secondary planet gear is rotatably arranged on the planet carrier through a pin shaft, the planet carrier is connected to an output assembly through the pin shaft, and the output assembly is connected to the valve stem of the valve;

[0006] A volute tooth surface is provided on the outer side of the gear ring, and the manual operating mechanism includes a transmission shaft 1 rotatably arranged in the box body at one end, a worm 1 slidably sleeved on the transmission shaft 1, the worm 1 meshes with the volute tooth surface, and a stopper 1 and a stopper 2 are respectively provided on the transmission shaft 1 at both ends of the worm, a spring 1 is provided between the worm and the stopper 1, a spring 2 is provided between the worm and the stopper 2, and a handwheel is provided at the other end of the transmission shaft 1.

[0007] One end of the primary sun gear is connected to a worm wheel, and the electric drive mechanism includes a transmission shaft 2 rotatably arranged in the housing, a gear 1 connected to one end of the transmission shaft 2, and a worm 2 connected to the other end of the transmission shaft 2, the worm 2 is meshed with the worm wheel, a motor is arranged in the housing, and the motor shaft of the motor is connected to a gear 2, and the gear 2 is meshed with the gear 1.

[0008] A guide block is arranged on the side of the transmission shaft 1, a guide groove is opened on the inner side of the worm gear 1, and the worm gear 1 is slidably arranged on the outer side of the guide block of the transmission shaft 1 through the guide groove.

[0009] The output assembly includes a bearing sleeve connected to the pin shaft, a connecting shaft slidably inserted into the bearing sleeve, an inner tooth surface is provided on the inner side of the bearing sleeve, an outer tooth surface combined with the inner tooth surface is provided at one end of the connecting shaft, and the other end of the connecting shaft is connected to the valve stem of the valve.

[0010] Compared with the prior art, the beneficial effects of the utility model are:

[0011] (1) By arranging block 1 and block 2 at both ends of worm gear 1, and spring 1 is arranged between block 1 and worm gear 1, and spring 2 is arranged between block 2 and worm gear 1, when the gear ring is in electric drive mode, when the force from the primary planetary gear is transmitted to worm gear 1, the force of worm gear 1 is buffered by spring 1 and spring 2, thereby avoiding excessive impact of the gear ring on worm gear 1, and protecting the worm gear; when the gear ring is in manual operation mode, continuing to turn the hand wheel will increase the force between the gear ring and worm gear 1. By setting spring 1 and spring 2, worm gear 1 can move up and down, thereby buffering the force concentration between the gear ring and worm gear 1 caused by continuing to turn the hand wheel, and protecting the gear ring and turbine.

[0012] (2) The connecting shaft is slidably arranged in the bearing sleeve, and the connecting shaft is connected to the valve stem of the valve, thereby avoiding the impact of the axial movement of the valve stem on the electric actuator, protecting the electric actuator, and making the electric actuator more durable. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1It is a schematic diagram of the internal structure of the utility model.

[0014] Figure 2 It is a schematic diagram of the combination of the electric drive mechanism and the speed reduction mechanism of the utility model.

[0015] Figure 3 It is a partial structural schematic diagram of the manual operating mechanism of the utility model.

[0016] Figure 4 This is a schematic diagram of the internal structure of the speed reduction mechanism of the utility model. Figure 1 .

[0017] Figure 5 This is a schematic diagram of the internal structure of the speed reduction mechanism of the utility model. Figure 2 .

[0018] Among them, in the figure: 1, housing; 2, reduction mechanism; 21, main shaft; 22, primary sun gear; 23, secondary sun gear; 24, planet carrier; 25, primary planet gear; 26, secondary planet gear; 27, ring gear; 271, volute tooth surface; 28, pin shaft; 29, worm gear; 3, electric drive mechanism; 31, transmission shaft 2; 32, gear 1; 33, worm 2; 34, motor; 35, gear 2; 4, manual operating mechanism; 41, transmission shaft 1; 411, guide block; 42, worm 1; 421, guide groove; 43, block 1; 44, block 2; 45, spring 1; 46, spring 2; 47, handwheel; 5, output assembly; 51, bearing sleeve; 52, connecting shaft. DETAILED DESCRIPTION

[0019] In order to more clearly illustrate the technical features of this solution, this solution is described below through specific implementation methods.

[0020] See also Figure 1-Figure 5 A novel electric actuator comprises a housing 1, a reduction mechanism 2 arranged in the housing 1, an electric drive mechanism 3 and a manual operating mechanism 4 respectively connected to the reduction mechanism 2, the reduction mechanism 2 comprises a main shaft 21 arranged in the housing 1, a primary sun gear 22 and a secondary sun gear 23 respectively rotatably arranged on the main shaft 21, a planet carrier 24 rotatably arranged outside the main shaft 21, a primary planetary gear 25 and a secondary planetary gear 26 respectively rotatably arranged on both sides of the planet carrier 24, and a gear ring 27 respectively meshing with the primary planetary gear 25 and the secondary planetary gear 26, a plurality of primary planetary gears 25 are meshed with the primary sun gear 22, the planet carrier 24 is connected to one end of the secondary sun gear 23, a plurality of secondary planetary gears 26 are meshed with the secondary sun gear 23, the secondary planetary gear 26 is rotatably arranged on the planet carrier 24 through a pin shaft 28, the planet carrier 24 is connected to an output assembly 5 through the pin shaft 28, and the output assembly 5 is connected to the valve stem of the valve,

[0021] A volute tooth surface 271 is provided on the outer side of the gear ring 27. The manual operating mechanism 4 includes a transmission shaft 41 with one end rotatably arranged in the housing 1, a worm 42 slidably sleeved on the transmission shaft 41, the worm 42 meshes with the volute tooth surface 271, and a stopper 43 and a stopper 44 are respectively provided at both ends of the worm on the transmission shaft 41. A spring 45 is provided between the worm and the stopper 43, a spring 46 is provided between the worm 42 and the stopper 44, and a hand wheel 47 is provided at the other end of the transmission shaft 41.

[0022] One end of the primary sun gear 22 is connected to a worm gear 29, and the electric drive mechanism 3 includes a transmission shaft 2 31 rotatably arranged in the housing 1, a gear 1 32 connected to one end of the transmission shaft 2 31, and a worm 2 33 connected to the other end of the transmission shaft 2 31, and the worm 2 33 is meshed with the worm gear 29. A motor 34 is arranged in the housing 1, and the motor shaft of the motor 34 is connected to a gear 2 35, and the gear 2 35 is meshed with the gear 1 32.

[0023] A guide block 411 is provided on the side of the transmission shaft 41 , a guide groove 421 is provided on the inner side of the worm 42 , and the worm 42 is slidably arranged on the outer side of the guide block 411 of the transmission shaft 41 through the guide groove 421 .

[0024] The output assembly 5 includes a bearing sleeve 51 connected to the pin shaft 28, a connecting shaft 52 slidably inserted into the bearing sleeve 51, an inner tooth surface is provided on the inner side of the bearing sleeve 51, an outer tooth surface combined with the inner tooth surface is provided at one end of the connecting shaft 52, and the other end of the connecting shaft 52 is connected to the valve stem of the valve.

[0025] The specific working process of this utility model:

[0026] When the electric actuator is in the electric drive state, the motor 34 drives the gear 1 32 to rotate through the gear 2 35, the gear 1 32 drives the worm 2 33 to rotate through the transmission shaft 2 31, and the worm 2 33 drives the main shaft 21 to rotate through the worm wheel 29. At this time, the first-stage sun gear 22 on the main shaft 21 rotates, and drives the first-stage planetary gear 25 on the planetary carrier 24 to rotate. Since the volute tooth surface 271 on the outer side of the ring gear 27 is meshed with the worm 1 42, the self-locking effect of the worm 1 42 avoids the rotation of the ring gear 27. As a result, the meshing effect of the first-stage planetary gear 25 and the ring gear 27 makes the first-stage planetary gear 25 drive the planetary carrier 24 to rotate, and through the planetary carrier 24 drives the second-stage planetary gear 26 on the other side to rotate in the ring gear 27, the bearing sleeve 51 connected to the planetary carrier 24 drives the connecting shaft 52 to rotate, and then the connecting shaft 52 drives the valve stem to move, so as to achieve the purpose of controlling the valve.

[0027] Since the worm 42 is slidably arranged on the transmission shaft 41, by arranging a block 43 and a block 44 at both ends of the worm 42, and a spring 45 is arranged between the block 43 and the worm 42, and a spring 46 is arranged between the block 44 and the worm 42, when the ring gear 27 is subjected to the force from the primary planetary gear 25 and transmitted to the worm 42, the force of the worm 42 is buffered by the spring 45 and the spring 46, thereby avoiding excessive impact of the ring gear 27 on the worm 42, and protecting the worm 42.

[0028] When the electric actuator is in manual operation, when the motor 34 stops running, the handwheel 47 is manually rotated, and the handwheel 47 drives the transmission shaft 41 to rotate, the transmission shaft 41 drives the worm 42 to rotate, and the worm 42 drives the ring gear 27 to rotate. When the ring gear 27 rotates, it drives the primary planetary gear 25 and the secondary planetary gear 26 to rotate respectively. Since the worm wheel 29 is self-locking by the worm 23, the rotation of the primary sun gear 22 is avoided, and the planet carrier 24 rotates around the primary sun gear 22, the planet carrier 24 drives the bearing sleeve 51 to rotate, the bearing sleeve 51 drives the connecting shaft 52 to rotate, and then the connecting shaft 52 drives the valve stem to move, so as to achieve the purpose of controlling the valve. When the valve is in the open limit position or the closed limit position, stop turning the handwheel 47.

[0029] When the valve reaches the limit position, continuing to turn the hand wheel 47 will increase the force between the ring gear 27 and the worm 42. Through the setting of spring 1 45 and spring 2 46, the worm 42 can move up and down, thereby buffering the force concentration between the ring gear 27 and the worm 42 caused by continuing to turn the hand wheel 47, and protecting the ring gear 27 and the turbine.

[0030] The connecting shaft 52 is slidably disposed in the bearing sleeve 51 and is connected to the valve stem of the valve, thereby avoiding the impact of the axial movement of the valve stem on the electric actuator, protecting the electric actuator, and making the electric actuator more durable.

[0031] Technical features not described in the present invention can be achieved through or by adopting existing technologies, and will not be elaborated here. Of course, the above description is not a limitation of the present invention, and the present invention is not limited to the above examples. Changes, modifications, additions or substitutions made by ordinary technicians in this technical field within the essential scope of the present invention should also fall within the scope of protection of the present invention.

Claims

1. A novel electric actuator, comprising a housing (1), a speed reduction mechanism (2) arranged in the housing (1), an electric drive mechanism (3) and a manual operating mechanism (4) respectively connected to the speed reduction mechanism (2), characterized in that: The speed reduction mechanism (2) comprises a main shaft (21) arranged in the housing (1), a primary sun gear (22) and a secondary sun gear (23) rotatably arranged on the main shaft (21), a planet carrier (24) rotatably arranged outside the main shaft (21), a primary planet gear (25) and a secondary planet gear (26) rotatably arranged on both sides of the planet carrier (24), and a ring gear (27) meshing with the primary planet gear (25) and the secondary planet gear (26), a plurality of the primary planet gears (25) are meshed with the primary sun gear (22), a plurality of the secondary planet gears (26) are meshed with the secondary sun gear (23), the secondary planet gear (26) is rotatably arranged on the planet carrier (24) via a pin shaft (28), the planet carrier (24) is connected to an output assembly (5) via the pin shaft (28), and the output assembly (5) is connected to a valve stem of a valve; The outer side of the gear ring (27) is provided with a volute tooth surface (271), the manual operating mechanism (4) comprises a transmission shaft (41) with one end rotatably arranged in the housing (1), a worm (42) slidably sleeved on the transmission shaft (41), the worm (42) meshing with the volute tooth surface (271), a stopper (43) and a stopper (44) are respectively provided on the transmission shaft (41) at both ends of the worm, a spring (45) is provided between the worm and the stopper (43), a spring (46) is provided between the worm (42) and the stopper (44), and a hand wheel (47) is provided at the other end of the transmission shaft (41).

2. The novel electric actuator according to claim 1 is characterized in that: One end of the primary sun gear (22) is connected to a worm gear (29); the electric drive mechanism (3) comprises a second transmission shaft (31) rotatably arranged in the housing (1); a first gear (32) connected to one end of the second transmission shaft (31); and a second worm (33) connected to the other end of the second transmission shaft (31); the second worm (33) meshes with the worm gear (29); a motor (34) is arranged in the housing (1); a motor shaft of the motor (34) is connected to a second gear (35); and the second gear (35) meshes with the first gear (32).

3. The novel electric actuator according to claim 1 is characterized in that: A guide block (411) is provided on the side of the transmission shaft one (41), a guide groove (421) is provided on the inner side of the worm gear one (42), and the worm gear one (42) is slidably arranged on the outer side of the guide block (411) of the transmission shaft one (41) through the guide groove (421).

4. The novel electric actuator according to claim 2 is characterized in that: The output assembly (5) comprises a bearing sleeve (51) connected to the pin shaft (28), and a connecting shaft (52) slidably inserted into the bearing sleeve (51), wherein the inner side of the bearing sleeve (51) is provided with an inner tooth surface, one end of the connecting shaft (52) is provided with an outer tooth surface combined with the inner tooth surface, and the other end of the connecting shaft (52) is connected to a valve stem of the valve.

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