Multi-turn electric actuator manual-automatic switching mechanism

Abstract

The utility model discloses a multi-rotation electric actuator manual automatic switching mechanism, the outside of the shell of actuator installs servo motor, the inside of shell, through bearing installation mutual occlusion worm wheel and worm, motor output shaft drives worm through motor reduction gear set, and worm wheel is used for output power, and motor reduction gear set includes a plurality of mutual occlusion motor reduction gear, and they rotatable installation is in support plate, and support plate installs in the inside of shell, and motor output shaft connects one motor reduction gear, and switching mechanism includes hand wheel, change gear, hand wheel clutch, worm clutch, and hand wheel is connected change gear through hand wheel axle and hand wheel clutch, and change gear occlusion driven gear, and driven gear is fixed in the lower part of worm. The utility model has the advantages of compact whole mechanism design, avoids the operation complexity and space occupation problem of traditional handle switching mode, and improves the automation degree and use convenience of equipment.

Description

Technical Field

[0001] This utility model relates to the field of electric actuator technology, specifically a manual / automatic switching mechanism for a multi-turn electric actuator. Background Technology

[0002] Electric actuators require switching from electric to manual mode during power outages, maintenance, or testing. Currently, existing electric actuators use a handle for switching between electric and manual modes, which introduces operational complexity and space constraints. Furthermore, maintenance or testing must be performed while the machine is stopped. Therefore, improvements are needed. Summary of the Invention

[0003] To overcome the shortcomings of the prior art, this utility model provides a manual / automatic switching mechanism for a multi-turn electric actuator.

[0004] This utility model is achieved through the following technical solution:

[0005] This utility model relates to a multi-turn electric actuator manual / automatic switching mechanism. A servo motor is mounted on the outside of the actuator's housing. Inside the housing, a meshing worm gear and worm are mounted via bearings. The motor output shaft drives the worm via a motor reduction gear set, and the worm gear is used for outputting power. Its key feature is:

[0006] The motor reduction gear set includes several meshing motor reduction gears, which are rotatably mounted on a support plate, which is installed inside the housing; the motor output shaft is connected to one of the motor reduction gears.

[0007] The switching mechanism includes a handwheel, a gear transmission, a handwheel clutch, and a worm clutch. The handwheel is connected to the gear transmission via a handwheel shaft and the handwheel clutch. The gear transmission meshes with the driven gear, and the driven gear is fixed to the lower part of the worm.

[0008] The worm gear has a hollow internal structure with an inner shaft inside. The upper end of the inner shaft is connected to the shaft of another motor reduction gear, and the lower plate of the worm clutch is fixedly installed at the lower end of the inner shaft. The upper plate of the worm clutch is slidably fitted on the spline at the lower end of the worm. The upper plate of the worm clutch rises and falls, disengaging or engaging with the lower plate of the worm clutch, so as to realize the worm disengaging from the inner shaft or rotating synchronously, thereby realizing automatic switching to manual.

[0009] By pulling the handwheel and the lower plate of the handwheel clutch, the handwheel can be connected or disengaged from the upper plate of the handwheel clutch, thereby connecting or disengaging the handwheel from the transmission gear and achieving automatic to manual switching.

[0010] In a further preferred embodiment, a gear shaft and its transmission gear are mounted on the inner side of the housing via bearings. The upper plate of the handwheel clutch is fixedly mounted on the gear shaft, and the lower plate of the handwheel clutch is fixedly mounted on the upper part of the handwheel shaft. The handwheel shaft and the gear shaft are located on the same axis, and the handwheel shaft is retractably mounted on the housing via the handwheel base.

[0011] In a further preferred embodiment, a double-hole gear set base is installed on the handwheel shaft. The right hole of the double-hole gear set base is fitted with a bearing sleeve on the outer groove of the upper plate of the worm gear clutch, and the left hole of the double-hole gear set base is fitted with a bearing sleeve on the outer groove of the lower plate of the handwheel clutch. The double-hole gear set base is used to simultaneously drive the upper plate of the worm gear clutch and the lower plate of the handwheel clutch to move upward or downward.

[0012] In a further preferred embodiment, a return spring is provided between the upper and lower plates of the handwheel clutch, and the return spring is sleeved on the gear shaft to separate the upper and lower plates of the handwheel clutch and eject the handwheel shaft and handwheel; a return spring is provided between the driven gear and the upper plate of the worm clutch, and the return spring is sleeved on the worm to engage the upper and lower plates of the worm clutch, so that the inner shaft drives the worm to operate automatically.

[0013] In a further preferred embodiment, several interlocking gears gradually increase in size to achieve a speed reduction function, with the motor output shaft connected to the small gear and the worm gear's inner shaft connected to the large gear.

[0014] In a further preferred embodiment, both the handwheel clutch and the worm gear clutch are manual clutches, comprising upper and lower plates, each with a slot and / or pawl. The pawl of the upper clutch plate can engage with the slot of the lower clutch plate, or the pawl of the lower clutch plate can engage with the slot of the upper clutch plate. The upper or lower clutch plate can be manually operated to raise or lower, thereby separating or engaging the two clutch plates. The worm gear clutch enables the inner shaft to disengage from or rotate synchronously with the worm, and the handwheel clutch enables the handwheel to disengage from or rotate synchronously with the transmission gear.

[0015] The advantages of this invention are that it avoids the operational complexity and space occupation problems caused by traditional handle switching methods, improving the automation level and ease of use of the equipment. This solution achieves seamless switching between manual and automatic modes through a dual-clutch structure (handle clutch and worm gear clutch), avoiding power interruption during switching (the servo motor does not need to stop), and improving operational continuity and stability. Furthermore, the combination of gear transmission and worm gear transmission effectively achieves high torque output and precise control, meeting the execution requirements under complex working conditions. The overall structure has a high degree of integration, reducing external operating components and improving the safety and reliability of the equipment.

[0016] In practical applications, this switching mechanism achieves efficient power transmission and mode switching through precise matching of gear ratios and optimized clutch linkage logic, effectively reducing the errors and inconveniences caused by manual operation in traditional mechanisms. The rational coordination between the worm gear, motor reduction gear, and speed-changing gear further enhances the deceleration effect and the controllability of output torque, ensuring stable operation of the actuator under different working conditions. Furthermore, the overall structure adopts a modular design, facilitating installation and maintenance, significantly improving the equipment's scalability and adaptability, and providing a practical solution for industrial automation control. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the front view of this utility model. Figure 2 for Figure 1 A partially enlarged schematic diagram, Figure 3 For illustration purposes only. Figure 4 , Figure 5 , Figure 6 The diagrams are, in order, of the worm gear, the inner shaft, and the worm gear-inner shaft assembly. Figure 7 This is a schematic diagram of the overall layout.

[0018] In the diagram: 1. Handwheel, 2. Handwheel shaft, 3. Motor reduction gear one, 4. Motor reduction gear two, 5. Motor reduction gear three, 6. Bearing one, 7. Speed ​​change gear, 8. Gear shaft, 9. Double-hole gear set base, 10. Motor output shaft, 11. Bearing two, 12. Return spring one (cylindrical compression spring one), 13. Return spring two (cylindrical compression spring two), 14. Upper clutch plate, 15. Lower clutch plate, 16. E-type spring, 17. Worm gear, 18. Driven gear, 19. Support plate, 20. Worm wheel, 22. Handwheel clutch, 23. Inner shaft, 24. Handwheel mounting seat, 25. Housing. Detailed Implementation

[0019] The attached figure shows a specific embodiment of this utility model.

[0020] In the description of this utility model, the term "multiple" refers to two or more. Unless otherwise explicitly defined, the terms "upper," "lower," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. The terms "connection," "installation," "fixing," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0021] The present invention relates to a multi-turn electric actuator manual / automatic switching mechanism. A servo motor is installed on the outside of the actuator housing. Inside the housing, a worm wheel 20 and a worm 17 are installed through bearings. The motor output shaft 10 drives the worm through a motor reduction gear set. The worm wheel is used to output power.

[0022] The motor reduction gear set includes several meshing motor reduction gears 3, 4, and 5, which are rotatably mounted on a support plate 19, which is installed inside the housing; the motor output shaft is connected to one of the motor reduction gears 3.

[0023] The switching mechanism includes a handwheel 1, a gear 7, a handwheel clutch 22, and worm clutches 14 and 15. The handwheel is connected to the gear 7 via the handwheel shaft 2 and the handwheel clutch. The gear 7 meshes with the driven gear 18, which is fixed to the lower part of the worm 17.

[0024] The worm 17 has a hollow internal structure with an inner shaft 23 inside. The upper end of the inner shaft is connected to the shaft of another motor reduction gear 5. The lower end of the inner shaft is fixedly installed with the lower worm clutch plate 15. The upper worm clutch plate 14 is slidably fitted on the spline at the lower end of the worm 17. The upper worm clutch plate rises and falls, disengaging or engaging with the lower worm clutch plate, so as to realize the worm disengaging from the inner shaft or rotating synchronously, thereby realizing automatic switching to manual.

[0025] By pulling the lower plate of handwheel 1 and handwheel clutch 22, the handwheel can be connected or disengaged from the upper plate of the handwheel clutch, thereby connecting or disengaging the handwheel from the transmission gear 7, thus achieving automatic switching to manual mode.

[0026] The gear shaft 8 and its transmission gear 7 are mounted on the inner side of the housing via bearings. The upper plate of the handwheel clutch 22 is fixedly mounted on the gear shaft, and the lower plate of the handwheel clutch is fixedly mounted on the upper part of the handwheel shaft. The handwheel shaft 2 and the gear shaft 8 are located on the same axis. The handwheel shaft 2 is removably mounted on the housing via the handwheel base.

[0027] A double-hole gear set base 9 is installed on the handwheel shaft. The right hole of the double-hole gear set base is fitted with a bearing sleeve on the outer groove of the upper plate 14 of the worm clutch, and the left hole of the double-hole gear set base is fitted with a bearing sleeve on the outer groove of the lower plate of the handwheel clutch 22. The double-hole gear set base is used to simultaneously drive the upper plate of the worm clutch and the lower plate of the handwheel clutch to move upward or downward.

[0028] There is a return spring 12 between the upper and lower plates of the handwheel clutch 22. The return spring is sleeved on the gear shaft 8 and is used to separate the upper and lower plates of the handwheel clutch, and to eject the handwheel shaft and handwheel 1. There is a return spring 13 between the driven gear 18 and the upper plate 14 of the worm clutch. The return spring 13 is sleeved on the worm and is used to engage the upper and lower plates of the worm clutch, so that the inner shaft drives the worm to rotate automatically.

[0029] Several interlocking gears 3, 4, and 5 gradually increase in size to achieve speed reduction. The motor output shaft is connected to the small gear, and the inner shaft 23 of the worm is connected to the large gear.

[0030] The handwheel clutch 22, worm gear clutches 14 and 15 are all manual clutches, consisting of upper and lower plates, each with a slot and / or pawl. The pawl of the upper clutch plate can engage with the slot of the lower clutch plate, or the pawl of the lower clutch plate can engage with the slot of the upper clutch plate. The upper or lower clutch plate can be manually operated to raise or lower, thereby separating or engaging the two clutch plates. The worm gear clutch enables the inner shaft 23 to disengage from or rotate synchronously with the worm gear 17. The handwheel clutch enables the handwheel to disengage from or rotate synchronously with the transmission gear.

[0031] The handwheel shaft 2 is retractable and rotatable and is installed inside the handwheel mounting sleeve 24, which is fixedly mounted on the outer casing 25.

[0032] This multi-turn electric actuator manual / automatic switching mechanism uses a servo motor-driven gear set for power transmission, and switches between manual and automatic modes via handwheel clutch 22 and worm clutches 14 and 15. In automatic mode, the servo motor drives the worm gear 17 and worm wheel 20 through motor reduction gears 3, 4, and 5 to reduce speed and increase torque, thereby driving the actuator to complete the predetermined action. In manual mode, the operator can drive the worm gear 17 and worm wheel 20 manually via handwheel 1, handwheel shaft 2, handwheel clutch 22, gear 7, and driven gear 18, allowing the worm wheel to output power and directly control the actuator without relying on electric drive.

[0033] This invention further optimizes the layout of the gear set and the linkage method of the clutch assembly. Specifically, when driven by the motor, the motor output shaft 10 cooperates with the motor reduction gears 3, 4, and 5 to transmit power to the worm gear 17 and worm wheel 20, which further transmits power to the actuator, achieving high-precision transmission. When manually operated for external control, the handwheel 1 is connected to the speed-changing gear 7, which meshes with the driven gear 18. External control is achieved through manual operation, realizing initial deceleration. At the same time, the worm gear is connected to the driven gear 18, and power is manually transmitted to the actuator via the worm gear and worm wheel.

[0034] By synchronously controlling the upper plate 14 of the worm clutch and the lower plate 22 of the handwheel clutch, flexible switching between automatic and manual modes is possible, and the servo motor does not need to be stopped for adjustment, greatly improving operating efficiency. Specifically, pushing the handwheel 1 upwards moves the handwheel shaft 2 and the lower plate of the handwheel clutch 22 upwards together, engaging the lower plate of the handwheel clutch with the upper plate. Rotating the handwheel causes the transmission gear 7 to drive the driven gear 18 to rotate, which in turn drives the worm 17 to rotate, and the worm drives the worm wheel 20 to rotate. When the handwheel is pushed upwards, moving the handwheel shaft and the lower plate of the handwheel clutch upwards together, the double-hole gear set base 9 moves upwards, causing the upper plate 14 of the worm clutch to disengage from the lower plate 15 of the worm clutch. The worm 17 then disengages from the inner shaft 23 and rotates synchronously, thus the servo motor cannot drive the worm to rotate, thereby disengaging the servo motor's power. Rotating the handwheel 1 allows for manual direct control of the actuator. After maintenance or testing is completed, the handwheel 1 is released manually. The lower plate of the handwheel clutch 22 is ejected by the return spring 12, disengaging the handwheel from the transmission gear 7. Simultaneously, under the action of the return spring 23, the upper plate 14 of the worm clutch moves downwards to reset, engaging with the lower plate 15 of the worm clutch. The inner shaft 23 drives the worm 17 to rotate, thereby connecting the power of the servo motor and re-establishing the actuator's automatic mode. The servo motor does not need to stop during this process.

[0035] The overall mechanism uses cylindrical compression spring 12 and cylindrical compression spring 23 (reset spring) to provide reset force, ensuring the stability and response speed of the handwheel clutch 22 and worm clutch 14 and 15 switching. At the same time, the setting of E-type spring 16 further enhances the structural reliability.

[0036] The worm gear 17 is a hollow structure with an inner shaft 23 fitted inside. The upper end of the inner shaft is connected to the shaft of the motor reduction gear 3 5. The inner shaft can rotate freely inside the worm gear. The driven gear 18 is fixedly installed at the lower end of the worm gear, and the upper plate of the worm gear clutch 14 is installed through a spline, allowing the upper plate of the worm gear clutch to slide up and down. In manual mode, the handwheel 1, the lower plate of the handwheel clutch 22, and the upper plate of the worm gear clutch 14 are pushed upwards. In automatic mode, the return springs 12 and 13 eject the handwheel, the lower plate of the handwheel clutch, and the upper plate of the worm gear clutch to reset.

Claims

1. A manual / automatic switching mechanism for a multi-turn electric actuator, wherein a servo motor is mounted on the outside of the actuator housing, and a worm gear and a worm are mounted inside the housing via bearings; the motor output shaft drives the worm via a motor reduction gear set, and the worm gear is used to output power; characterized in that: The motor reduction gear set includes several meshing motor reduction gears, which are rotatably mounted on a support plate, which is installed inside the housing; the motor output shaft is connected to one of the motor reduction gears. The switching mechanism includes a handwheel, a gear transmission, a handwheel clutch, and a worm clutch. The handwheel is connected to the gear transmission via a handwheel shaft and the handwheel clutch. The gear transmission meshes with the driven gear, and the driven gear is fixed to the lower part of the worm. The worm gear has a hollow internal structure with an inner shaft inside. The upper end of the inner shaft is connected to the shaft of another motor reduction gear, and the lower plate of the worm clutch is fixedly installed at the lower end of the inner shaft. The upper plate of the worm clutch is slidably fitted on the spline at the lower end of the worm. The upper plate of the worm clutch rises and falls, disengaging or engaging with the lower plate of the worm clutch, so as to realize the worm disengaging from the inner shaft or rotating synchronously, thereby realizing automatic switching to manual. By pulling the handwheel and the lower plate of the handwheel clutch, the handwheel can be connected or disengaged from the upper plate of the handwheel clutch, thereby connecting or disengaging the handwheel from the transmission gear and achieving automatic to manual switching.

2. The manual / automatic switching mechanism for a multi-turn electric actuator according to claim 1, characterized in that: The gear shaft and its transmission gear are mounted on the inner side of the housing via bearings. The upper plate of the handwheel clutch is fixedly mounted on the gear shaft, and the lower plate of the handwheel clutch is fixedly mounted on the upper part of the handwheel shaft. The handwheel shaft and the gear shaft are located on the same axis. The handwheel shaft is removably mounted on the housing via the handwheel base.

3. The manual / automatic switching mechanism for a multi-turn electric actuator according to claim 1, characterized in that: A double-hole gear set base is installed on the handwheel shaft. The right hole of the double-hole gear set base is fitted with a bearing on the outer groove of the upper plate of the worm clutch, and the left hole of the double-hole gear set base is fitted with a bearing on the outer groove of the lower plate of the handwheel clutch. The double-hole gear set base is used to simultaneously drive the upper plate of the worm clutch and the lower plate of the handwheel clutch to move upward or downward.

4. The manual / automatic switching mechanism for a multi-turn electric actuator according to claim 2, characterized in that: There is a return spring between the upper and lower plates of the handwheel clutch. The return spring is sleeved on the gear shaft and is used to separate the upper and lower plates of the handwheel clutch, so as to eject the handwheel shaft and the handwheel. There is a return spring between the driven gear and the upper plate of the worm clutch. The return spring is sleeved on the worm and is used to engage the upper and lower plates of the worm clutch, so as to drive the worm to rotate automatically.

5. The manual / automatic switching mechanism for a multi-turn electric actuator according to claim 1, characterized in that: Several interlocking gears gradually increase in size to achieve speed reduction. The motor output shaft is connected to the small gear, and the inner shaft of the worm is connected to the large gear.

6. The manual / automatic switching mechanism for a multi-turn electric actuator according to claim 1, characterized in that: Both handwheel clutches and worm gear clutches are manual clutches, consisting of upper and lower plates, each with a slot and / or pawl. The pawl of the upper clutch plate can engage with the slot of the lower clutch plate, or vice versa. The upper or lower clutch plate can be manually raised or lowered to separate or engage the two clutch plates. The worm gear clutch disengages the inner shaft from the worm or allows it to rotate synchronously. The handwheel clutch disengages the handwheel from the transmission gear or allows it to rotate synchronously.

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