Transmission device of self-locking electric actuating mechanism

Abstract

The invention discloses a transmission device of a self-locking electric actuating mechanism, and relates to an electric actuating mechanism. Comprising a worm arranged on a shell and driven by a motor to rotate; the worm gear is arranged on the output shaft in a sleeving manner and is meshed with the worm; the gear A is arranged on the output shaft in a sleeving manner and is in transmission connection with the worm gear; the planet carrier X is fixedly arranged on the output shaft in a sleeving manner; the planet carrier X is provided with a first gear C which is rotatably arranged, and the planet carrier X is driven to rotate through meshing of the gear A and the first gear C, so that the output shaft is driven to rotate; according to the scheme, by means of the self-locking performance of the worm and gear pair and the planetary transmission mechanism, the motor shaft and the hand wheel of the electric actuating mechanism are effectively prevented from reversing, accidental injuries caused by following rotation can be avoided, and the valve can be accurately kept at the set position.

Description

Technical Field

[0001] The invention relates to an electric actuator, and in particular to an improvement of a transmission device of a self-locking electric actuator. Background Art

[0002] Electric actuators are widely used in the fields of electricity, petroleum, chemical industry and public utilities, and the mechanical transmission mechanism is an important part of the electric actuator. The transmission mechanism of the electric actuator is a mechanical mechanism that can not only transmit the rotation of the motor to the output shaft at a reduced speed, but also transmit the rotation of the worm gear to the output shaft, thereby realizing the control of the valve by the electric actuator.

[0003] At present, the control method used by most gate valves and stop valves is torque switch valve closing. It is required that after the valve is closed, the torque switch should remain in the closed position, that is, the electric actuator itself must have a self-locking function. The self-locking function of the electric actuator can ensure that the valve stays accurately in the set position and effectively prevent the motor shaft or handwheel of the electric actuator from rotating due to external interference (such as impact and vibration of the medium). In order to achieve the self-locking function, the existing electric actuator mainly realizes it through the self-locking of the worm gear pair. At the same time, in order to realize the switch from electric to manual, a corresponding switching mechanism needs to be added. The transmission efficiency of this scheme is low, the overall structure size is large, and the weight is heavy, which is not conducive to the lightweight and miniaturized design of the electric actuator. Summary of the invention

[0004] In view of the above problems, the present invention provides an electric actuator transmission device with compact structure and high transmission efficiency, which can not only realize full-automatic manual-electric switching, but also realize double self-locking after electric and manual are in place, thereby ensuring the accuracy of valve position.

[0005] The technical solution of the present invention is: a transmission device of a self-locking electric actuator, comprising an electric transmission mechanism and a manual transmission mechanism; The electric transmission mechanism comprises: A worm is arranged on the housing and driven to rotate by a motor; A worm wheel, sleeved on the output shaft and meshing with the worm; Gear A, sleeved on the output shaft and drivingly connected to the worm gear; A planet carrier X is fixedly sleeved on the output shaft; a first gear C is rotatably arranged on the planet carrier X, and the gear A is meshed with the first gear C to drive the planet carrier X to rotate, thereby driving the output shaft to rotate; The manual transmission mechanism comprises: A manual shaft is rotatably sleeved on the output shaft; a detachable and fixed hand wheel is provided on the top of the manual shaft; A planet carrier X' is detachably fixed at the bottom of the manual shaft; the planet carrier X' is provided with a plurality of evenly distributed rotatable gears C'; Gear A' is rotatably sleeved on the output shaft and meshes with the gear C'; Gear B is rotatably sleeved on the output shaft, and its top is drivingly connected to the gear A'; the planet carrier X is provided with a plurality of second gears C meshing with the gear B, and the second gears C are rotatably set on the planet carrier X and meshing with the first gears C.

[0006] Specifically, the gear B is provided with a rotatable gear B'; The gear B' is meshed with the gear C'; The gear B' is provided with a spur gear bar extending to the outside of the second gear C, and the side of the spur gear bar is provided with a torque shaft meshing with the spur gear bar; A disc spring group is provided on the side of the torque shaft, and a shell is provided outside the disc spring group. The shell is detachably fixedly connected to the housing.

[0007] Specifically, a sealing gasket is provided between the manual shaft and the hand wheel seat.

[0008] Specifically, the hand wheel seat is detachably fixedly connected to the housing.

[0009] Specifically, there are four gears C', which are evenly distributed on the planet carrier X' and mesh with the gears A' and B'.

[0010] Specifically, the first gear C and the second gear C of the first-stage planetary component are provided with two each, which are arranged up and down and mesh with each other.

[0011] Beneficial effects of the present invention: The present invention combines a planetary transmission mechanism with high transmission efficiency and compact structure with a worm gear, realizing the requirement of a transmission system with multiple inputs and a single output. Taking into account the friction loss of bearings and grease, the planetary efficiency can be as high as 0.93-0.95. The transmission mechanism is not only small and compact, but also improves the transmission efficiency.

[0012] The transmission device used can achieve seamless switching between electric and manual operation modes without the need for additional clutches or switching mechanisms. It is easy to operate and can quickly respond to various emergencies. At the same time, in order to achieve double self-locking after electric and manual operation and ensure the accuracy of the valve position, this case uses the self-locking property of the worm gear pair and the planetary transmission mechanism to effectively prevent the motor shaft and handwheel of the electric actuator from reversing, which can not only avoid accidental damage caused by following the rotation, but also keep the valve accurately in the set position. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a three-dimensional structural schematic diagram of the present invention; Figure 2 It is a schematic diagram of the cross-sectional plan structure of the present invention; Figure 3 It is a schematic diagram of the three-dimensional structure of the first-stage planetary component; Figure 4 It is a schematic diagram of the three-dimensional structure of the secondary planetary component; Figure 5 It is a schematic diagram of the three-dimensional structure of the manual parts; Figure 6 It is a two-dimensional structural diagram of a spur gear mechanism; In the figure, 1 is the output shaft, 2 is the worm gear, 3 is the worm, 4 is the gear A, 51 is the first gear C, 52 is the second gear C, 6 is the planetary carrier X, 7 is the gear B, 8 is the gear B', 9 is the gear C', 10 is the gear A', 11 is the planetary carrier X', 12 is the handwheel seat, 13 is the sealing gasket, 14 is the screw E, 15 is the manual shaft, 16 is the screw F, 17 is the handwheel, 18 is the spur gear, and 19 is the torque shaft. DETAILED DESCRIPTION

[0014] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0015] In the description of the present invention, it should be understood that the terms "upper", "lower", "left", "right", "vertical", "horizontal" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0016] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0017] Reference below Figure 1-6 describe the invention; A transmission device of a self-locking electric actuator comprises an electric transmission mechanism and a manual transmission mechanism; The electric transmission mechanism comprises: The worm 3 is arranged on the housing and driven to rotate by the motor; The worm wheel 2 is sleeved on the output shaft 1, meshed with the worm 3, and driven to rotate by the worm 3; The gear A4 is sleeved on the output shaft 1 and is drivingly connected to the worm gear 2. The rotation of the worm gear 2 drives the rotation of the gear A4. Specifically, during electric drive, the motor is powered on, and the motor drives the electric worm 3 to rotate, transmitting the torque to the worm wheel 2, and the worm wheel 2 is connected to the gear A4 of the primary planetary component through two claws.

[0018] The planet carrier X6 is fixedly mounted on the output shaft 1 through a spline; the planet carrier X6 is provided with a rotatable first gear C51 and a second gear C52, and the gear A4 is meshed with the first gear C51 to drive the planet carrier X6 to rotate, thereby driving the output shaft 1 to rotate; In this case, the first gear C51 and the second gear C52 of the first-stage planetary component are respectively provided with two; they are arranged up and down in pairs and mesh with each other, that is, the second gear C52 meshes with the gear B7, the first gear C51 meshes with the gear A4, and the first gear C51 meshes with the second gear C52 at the same time.

[0019] The manual transmission mechanism comprises: A manual shaft 15 is rotatably sleeved on the output shaft 1 through a bearing, near the top; a detachably fixed hand wheel 17 is provided on the top of the manual shaft 15; The planet carrier X'11 is detachably fixed at the bottom of the manual shaft 15; the planet carrier X'11 is provided with a plurality of evenly distributed rotatable gears C'9; specifically, the planet carrier X'11 of the secondary planetary component is connected to the manual shaft 15 of the manual component by four screws E14; The gears C'9 of the secondary planetary component are provided with four gears, which are evenly distributed on the planet carrier X'11 and mesh with the gears A'10 and B'8.

[0020] Gear A'10 is rotatably sleeved on the output shaft 1 and meshes with the gear C'9; Gear B7 is rotatably mounted on the output shaft 1, and is transmission-connected to the gear A'10 at the top, so that the rotation of gear B7 is driven by the rotation of gear A'10; a plurality of second gears C52 meshing with gear B7 are provided on the planet carrier X6, and the second gears C52 are rotatably mounted on the planet carrier X6.

[0021] When the motor stops driving the worm 3 to rotate, the method of manually controlling the rotation of the output shaft 1 is: Manually rotate the handwheel 17, the manual shaft 15 and the planet carrier X'11 rotate accordingly, the gear C'9 on the planet carrier X'11 drives the meshing gear A'10 to rotate, the gear A'10 is connected to the gear B7 through a number of claws, and then the second gear C52 on the planet carrier X6 rotates, and finally the planet carrier X6 drives the output shaft 1 to rotate. It should be noted that the helix angle of the worm 3 is smaller than the friction angle between the worm wheel 2 and the worm 3, and the worm pair formed by them has self-locking properties and can effectively prevent reversal, that is, when manually operated, the worm wheel 2 is fixed and cannot drive the worm 3 to rotate, and the worm wheel 2 and the gear A4 do not rotate.

[0022] Further optimized, the gear B7 is provided with a rotatable gear B'8; The gear B'8 is meshed with the gear C'9; The gear B'8 is provided with a spur gear bar 18 extending to the outside of the second gear C52, and the side of the spur gear bar 18 is provided with a torque shaft 19 meshing therewith; A disc spring assembly is provided on the side of the torque shaft 19 .

[0023] The torque shaft 19 and the spur gear bar 18 form a spur gear bar structure, which is used to control the output torque of the electric actuator in the electric and manual states. A disc spring group 20 is arranged at one end of the torque shaft 19, and the outer shell 21 of the disc spring group is fixed to the housing by screws. Under the preload of the disc spring group 20, the torque shaft 19 remains stationary. When the axial load acting on the torque shaft 19 (equal to the circumferential force acting on the spur gear bar 18) is greater than the preload of the disc spring, the torque shaft 19 will move axially but cannot rotate. The spur gear bar 18 structure satisfies self-locking, that is, the spur gear bar 18 is fixed, and the gear B'8 and the spur gear bar 18 are an integrated structure. It can be seen that the gear B'8 of the secondary planetary component is a fixed wheel.

[0024] For further optimization, a sealing gasket 13 is provided between the manual shaft 15 and the hand wheel seat 12 .

[0025] According to the above analysis, when the electric motor is in operation, the gear B'8 of the secondary planetary component is a fixed wheel, so that the gear C'9 cannot rotate around its own axis. At the same time, under the combined effect of the meshing force of the gear A'10 and the gear B'8 and the friction force of the bearing and the contact surface of the planet carrier X'11, the friction torque of the gear C'9 is greater than the driving torque, so that the gear C'9 cannot revolve normally around the axis of the gear A'10, resulting in a self-locking phenomenon, so the planet carrier X'11 and the gear A'10 cannot rotate. At the same time, the sealing gasket 13 between the manual shaft 15 and the handwheel seat 12 can make the manual shaft 15 bear a certain sealing preload force, so under the dual effects of the self-locking of the secondary planetary component and the preload force of the manual shaft 15, the manual component as a whole cannot rotate.

[0026] The hand wheel seat 12 is detachably fixedly connected to the housing.

[0027] In this case, the planet carrier X'11 is fixed to the manual shaft 15 by screw E14, that is, the planet carrier X'11 is fixed when it is powered. Gear A'10 is connected to gear B7 by two claws, and gear B7 is loosely sleeved on the output shaft 1, that is, the gear B7 of the primary planetary component is fixed when it is powered. When it is powered, the motor is powered on, and the motor drives the worm 3 to rotate, transmitting the torque to the worm wheel 2. The worm wheel 2 drives gear A4 to rotate through two claws, and gear A4 drives the first gear C51 to rotate around its own axis. Since the second gear C52 cannot rotate under the action of gear B7, and the first gear C51 and the second gear C52 are meshed with each other, the first gear C51 also revolves around the axis of the planet carrier 6, that is, it drives the planet carrier X6 to rotate. The planet carrier X6 drives the output shaft 1 to operate through the spline, and then drives the valve switch, thereby realizing the electric state.

[0028] After the electric stop, due to the self-locking of the secondary planetary components, gear A'10 and gear B7 cannot rotate; due to the self-locking of the electric worm gear, worm wheel 2 and gear A4 are fixed, so the first gear C51 and the second gear C52 are both fixed, that is, the output shaft 1 cannot drive the planetary carrier X6 to rotate through the spline, that is, the valve cannot drive the output shaft to rotate, thereby achieving self-locking.

[0029] When driven manually, due to the self-locking between the worm 3 and the worm wheel 2, that is, the worm wheel 2 cannot drive the worm 3 to rotate, so the worm wheel 2 is fixed in the manual state, that is, the gear A4 of the primary planetary component is a fixed wheel. Since the torque shaft 19 and the spur gear bar 18 form a spur gear bar structure, which meets the self-locking, the spur gear bar 18 is fixed, and the gear B'8 and the spur gear bar 18 are an integrated structure, that is, the gear B'8 of the secondary planetary component is a fixed wheel, so when the hand wheel 17 is turned, the hand wheel 17 causes the planet carrier X'11 of the secondary planetary component to make a circular motion through the manual shaft 15, and the gear C'9 drives the gear A'10 of the secondary planetary component to rotate and transmits the torque to the gear B7 of the primary planetary component. Since the gear A4 is a fixed wheel in the manual state, the gear B7 drives the planet carrier X6 of the primary planetary component to make a circular motion through the gear 5, and the planet carrier X6 drives the output shaft 1 to operate through the spline, and then drives the valve switch, so as to realize the manual state. Gear B7 drives the second gear C52 to rotate around its own axis. Since the first gear C51 cannot rotate under the action of gear A4, and the first gear C51 and the second gear C52 are meshed, the second gear C52 also revolves around the axis of the planet carrier 6, that is, it drives the planet carrier X6 to rotate. The planet carrier X6 drives the output shaft 1 to operate through the spline, and then drives the valve switch, thereby realizing the manual state.

[0030] After the handwheel stops in place, due to the self-locking of the secondary planetary components, gear A'10 and gear B7 cannot rotate; due to the self-locking of the electric worm gear, worm wheel 2 and gear A4 are fixed, so the first gear C51 and the second gear C52 are both fixed, that is, the output shaft 1 cannot drive the planetary carrier X6 to rotate through the spline, that is, the valve cannot drive the output shaft to rotate, thereby achieving self-locking.

[0031] Regarding the contents disclosed in this case, there are a few points that need to be explained: (1) The drawings of the embodiments disclosed in this case only involve the structures involved in the embodiments disclosed in this case. Other structures can refer to the general design; (2) In the absence of conflict, the embodiments and features of the embodiments disclosed in this case may be combined with each other to obtain new embodiments; The above are only specific implementation methods disclosed in this case, but the protection scope of the present disclosure is not limited thereto. The protection scope disclosed in this case should be based on the protection scope of the claims.

Claims

1. A transmission device of a self-locking electric actuator, characterized in that: Including electric transmission mechanism and manual transmission mechanism; The electric transmission mechanism comprises: A worm (3) is arranged on the housing and driven to rotate by a motor; A worm wheel (2) is sleeved on the output shaft (1) and meshes with the worm (3); A gear A (4), sleeved on the output shaft (1) and drivingly connected to the worm gear (2); A planet carrier X (6) is fixedly sleeved on the output shaft (1); a first gear C (51) is rotatably arranged on the planet carrier X (6); the gear A (4) is meshed with the first gear C (51), thereby driving the planet carrier X (6) to rotate, thereby driving the output shaft (1) to rotate; The manual transmission mechanism comprises: A manual shaft (15) is rotatably sleeved on the output shaft (1); a detachably fixed hand wheel (17) is provided on the top of the manual shaft (15); A planet carrier X' (11) is detachably fixedly arranged at the bottom of the manual shaft (15); a plurality of gears C' (9) are evenly distributed and rotatably arranged on the planet carrier X' (11); A gear A' (10) is rotatably sleeved on the output shaft (1) and meshes with the gear C' (9); The gear B (7) is rotatably sleeved on the output shaft (1), and the top thereof is drivingly connected to the gear A' (10); the planet carrier X (6) is provided with a plurality of second gears C (52) meshing with the gears B (7); the second gears C (52) are rotatably arranged on the planet carrier X (6) and meshing with the first gears C (51).

2. The transmission device of a self-locking electric actuator according to claim 1, characterized in that: The gear B (7) is provided with a rotatable gear B' (8); The gear B' (8) is meshed with the gear C' (9); The gear B' (8) is provided with a spur gear bar (18) extending to the outside of the second gear C (52), and a torque shaft (19) meshing with the spur gear bar (18) is provided on the side thereof; A disc spring group (20) is provided on the side of the torque shaft (19), and an outer shell (21) is provided outside the disc spring group (20), and the outer shell (21) is detachably fixedly connected to the housing.

3. The transmission device of a self-locking electric actuator according to claim 1, characterized in that: A sealing gasket (13) is provided between the manual shaft (15) and the hand wheel seat (12).

4. The transmission device of a self-locking electric actuator according to claim 1, characterized in that: The hand wheel seat (12) is detachably fixedly connected to the housing.

5. The transmission device of a self-locking electric actuator according to claim 1, characterized in that: There are four gears C' (9), which are evenly distributed on the planet carrier X' (11) and mesh with the gears A' (10) and B' (8).

6. The transmission device of a self-locking electric actuator according to claim 1, characterized in that: The first gear C (51) and the second gear C (52) of the first-stage planetary component are provided with two each, which are arranged up and down and mesh with each other.

Images