A hand-automatic mode quick switching device of an electric actuator

Abstract

The utility model provides a kind of electric actuator hand automatic mode quick switching device, including driving shaft and clutch shaft, clutch wheel is along the first clutch wheel and second clutch wheel being fixed with axle, and is engaged with the gear of driving shaft respectively by two clutch wheels;Hand wheel unit includes hand wheel and transmission shaft, and when second clutch wheel is engaged with manual transmission gear, transmission shaft can drive second clutch wheel rotation;Transmission shaft is equipped with a linkage sleeve, linkage sleeve is connected with a fork, and when linkage sleeve moves along axial direction, fork drives clutch shaft movement, so that two clutch wheels are engaged with two transmission gears respectively;Hand wheel is equipped with a crank handle, crank handle is hinged with hand wheel edge, and crank handle one end is connected with abutting sleeve by second connecting rod.The utility model makes that operating personnel can see handle and crank simultaneously, control fork moves clutch shaft to predetermined position while pulling crank, simultaneously, save operating personnel's time of movement while playing more intuitive prompting effect to operating personnel.

Description

Technical Field

[0001] This utility model belongs to the technical field of valve actuators, and in particular relates to a device for quickly switching between manual and automatic modes of an electric actuator. Background Technology

[0002] Valves are generally used to control the flow rate and on / off state of media in pipelines. For ease of control and management, an electric actuator is connected to the valve stem. The valve status is monitored by the motor and corresponding control module. However, in case of unexpected situations such as power failure or damage to the electric actuator, it is usually necessary to manually shut off the valve in an emergency to avoid greater accidental risks.

[0003] Currently, the manual / automatic switching method for electric actuators usually requires switching the electric module of the electric actuator to manual mode by operating external knobs, levers, etc. After operation, maintenance, or other work is completed, the knobs, levers, etc. need to be turned back to their original positions so that the electric actuator can re-engage in valve control.

[0004] This operation is rather cumbersome in emergency situations. Operators may become nervous in such situations and may turn the handwheel directly without switching the electric actuator from manual to automatic, which would prevent the valve from being turned on or off quickly, wasting time and requiring the operator to stay at the valve for an extended period, thus increasing the probability of the operator being in danger. Utility Model Content

[0005] In view of this, the present invention aims to propose a quick switching device for manual and automatic modes of an electric actuator, which combines the manual / automatic switching mode with a handwheel to provide prompts for the operator and avoid wasting operation time.

[0006] To achieve the above objectives, the technical solution of this utility model is implemented as follows:

[0007] A device for quickly switching between manual and automatic modes of an electric actuator, comprising:

[0008] A drive shaft, on which a motor drive gear and a manual drive gear are fixed axially;

[0009] A clutch shaft, along which a first clutch wheel and a second clutch wheel are fixedly mounted;

[0010] The manual unit includes a handwheel and a drive shaft that rotates synchronously with the handwheel. When the second clutch wheel engages with the manual transmission gear, the drive shaft can drive the second clutch wheel to rotate.

[0011] A linkage sleeve is fitted on the drive shaft. The linkage sleeve is connected to the outer end of a shift fork through a first connecting rod. When the linkage sleeve moves along the axial direction of the drive shaft, the shift fork can drive the clutch shaft to move along its own axial direction. The clutch shaft is placed in the space surrounded by the shift fork, so that the first clutch wheel or the second clutch wheel can mesh with the motor drive gear or the manual drive gear, respectively.

[0012] A stop sleeve is also fitted onto the drive shaft, which can abut against the linkage sleeve. A crank handle is provided on the handwheel, and the crank handle is hinged to the edge of the handwheel. One end of the crank handle is connected to the stop sleeve via a second connecting rod. The two ends of the second connecting rod are respectively hinged to the crank handle and the stop sleeve.

[0013] Furthermore, the end of the drive shaft is provided with a drive gear, and the drive shaft drives the drive gear to rotate through the engagement of the drive gear with the second clutch wheel.

[0014] Furthermore, a spring is fitted onto the drive shaft, with its two ends abutting against the drive gear and the linkage sleeve, respectively.

[0015] Furthermore, the end of the crank handle is provided with a hinge sleeve, and a hinge ear is fixed on the hinge sleeve. The second connecting rod is hinged to the hinge sleeve through the hinge ear.

[0016] Furthermore, a connecting sleeve is also fitted on the drive shaft. The connecting sleeve is connected to the linkage sleeve by a third link and a fourth link. The sum of the lengths of the third link and the fourth link is greater than the minimum distance between the linkage sleeve and the connecting sleeve. The ends of the second link, the third link and the fourth link are hinged to the same rotation center.

[0017] Furthermore, the clutch shaft is provided with a clutch sleeve, and the two ends of the clutch sleeve extend outward to form limiting edges, with the shift fork positioned between the two limiting edges.

[0018] Furthermore, the shift fork includes a fork body and a shift fork shaft, and the first connecting rod is rotatably connected to the shift fork shaft.

[0019] Furthermore, a guide sleeve is fitted onto the first connecting rod, and the guide sleeve is fixedly connected to the housing of the electric actuator.

[0020] Furthermore, a first fixing rod is provided above the shift fork, and a first guide surface is provided above the fork body. When the fork body moves away from the clutch shaft, the first fixing rod contacts the first guide surface, causing the end of the fork body away from the shift fork shaft to move downward.

[0021] Furthermore, a second fixing rod is provided below the shift fork, and a second guide surface is provided below the fork body. When the fork body moves towards the clutch shaft, the second fixing rod contacts the second guide surface, causing the end of the fork body away from the shift fork shaft to move upward.

[0022] Compared with existing technologies, the electric actuator manual / automatic mode quick switching device of this utility model has the following advantages:

[0023] This invention combines the structure controlling the movement of the clutch shaft with the handwheel, allowing the operator to see both the handwheel and the crank handle simultaneously. For ease of operation, turning the crank handle moves the clutch shaft to a predetermined position via a shift fork. This provides a more intuitive prompt to the operator and saves the time previously required to move from the position of the electric actuator to the handwheel before operation, enabling the operator to quickly get to the work of changing the valve state. Attached Figure Description

[0024] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of the utility model. The illustrative embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an undue limitation of the utility model. In the drawings:

[0025] Figure 1 A schematic diagram of the overall structure of the manual / automatic mode switching device for an electric actuator;

[0026] Figure 2 This is a schematic diagram of the clutch shaft and manual unit's mating structure;

[0027] Figure 3 This is a sectional view of the manual unit and the clutch shaft assembly structure.

[0028] Explanation of reference numerals in the attached figures:

[0029] 1-Drive shaft; 11-Motor transmission gear; 12-Manual transmission gear; 2-Clutch shaft; 21-First clutch wheel; 22-Second clutch wheel; 23-Clutch sleeve; 231-Limiting edge; 3-Manual unit; 31-Handwheel; 32-Crank handle; 321-Hinged sleeve; 322-Second connecting rod; 33-Transmission shaft; 331-Drive gear; 332-Spring; 34-Linkage sleeve; 341-First connecting rod; 35-Abutting sleeve; 351-Fourth connecting rod; 36-Connecting sleeve; 361-Third connecting rod; 37-Shift fork; 371-First guide surface; 372-Second guide surface; 373-Fork body; 374-Shift fork shaft; 38-First fixing rod; 39-Second fixing rod. Detailed Implementation

[0030] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0031] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, 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. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0032] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0033] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0034] A device for quickly switching between manual and automatic modes of an electric actuator, comprising:

[0035] A drive shaft 1 is axially fixed with a motor drive gear 11 and a manual drive gear 12. One end of the drive shaft 1 is connected to the valve stem of the valve.

[0036] A clutch shaft 2 is located on one side of the drive shaft 1. A first clutch wheel 21 and a second clutch wheel 22 are fixedly mounted along the shaft of the clutch shaft 2. A clutch sleeve 23 is provided between the first clutch wheel 21 and the second clutch wheel 22, with limiting edges 231 extending radially outward from both ends of the clutch sleeve 23. During operation, the clutch sleeve 23 drives the clutch shaft 2 to move along its own axial direction. When the clutch shaft 2 moves upward to its limit position, the first clutch wheel 21 engages with the motor drive gear 11; when the clutch wheel moves downward to its limit position, the second clutch wheel 22 engages with the manual transmission gear 12. Those skilled in the art should understand that, for ease of gear movement and engagement after disengagement, the first clutch wheel 21, the second clutch wheel 22, and the gears engaging with the two clutch wheels can be bevel gears, spur gears, or other types of gears. The output shaft of the electric actuator's motor is connected to the motor drive gear 11.

[0037] The manual unit 3 includes a handwheel 31 and a transmission shaft 33 that rotates synchronously with the handwheel 31. When the second clutch wheel 22 meshes with the manual transmission gear 12, the transmission shaft 33 can drive the second clutch wheel 22 to rotate. Specifically, the end of the transmission shaft 33 is fixedly connected to a drive gear 331, and the drive gear 331 is located below the second clutch wheel 22. When the clutch shaft 2 moves to the lower limit position, the transmission shaft 33 meshes with the second clutch wheel 22 through the drive gear 331, driving the drive gear 331 to rotate. At this time, the axial direction of the drive gear 331 is perpendicular to the axial direction of the connecting shaft.

[0038] A linkage sleeve 34 is fitted onto the drive shaft 33. The linkage sleeve 34 is connected to the outer end of a shift fork 37 via a first connecting rod 341. When the linkage sleeve 34 moves axially along the drive shaft 33, the shift fork 37 can drive the clutch shaft 2 to move axially. The clutch shaft 2 is placed within the space enclosed by the shift fork 37, so that the first clutch wheel 21 or the second clutch wheel 22 can respectively mesh with the motor drive gear 11 or the manual drive gear 12. More specifically, a short shaft extends radially outward from the end of the linkage sleeve 34, and the short shaft is hinged to the shift fork 37 via the first connecting rod 341. The shift fork 37 includes a fork body 373 and a shift fork shaft 374. The shift fork shaft 374 is located at the end of the shift fork 37 away from the clutch shaft 2. Specifically, the first connecting rod 341 is hinged to the shift fork shaft 374. When the linkage sleeve 34 moves along its own axis, the first connecting rod 341 moves, allowing the shift fork 37 to move between the two limiting edges 231. Specifically, a first fixing rod 38 is provided above the shift fork 37, and a first guide surface 371 is provided above the fork body 373. When the fork body 373 moves away from the clutch shaft 2, the first fixing rod 38 contacts the first guide surface 371, causing the end of the fork body 373 away from the shift fork shaft 374 to move downward. A second fixing rod 39 is provided below the shift fork 37, and a second guide surface 372 is provided below the fork body 373. When the fork body 373 moves towards the clutch shaft 2, the second fixing rod 39 contacts the second guide surface 372, causing the end of the fork body 373 away from the shift fork shaft 374 to move upward. The first fixing rod 38 and the second fixing rod 39 are respectively fixed to the housing of the electric actuator (not shown in the figure). The housing is also fixed with a guide sleeve. The first connecting rod 341 extends into the guide sleeve, so that the first connecting rod 341 moves along its own length. In this embodiment, the transmission shaft 33 and the shift fork 37 are respectively placed on both sides of the clutch shaft 2. When the linkage sleeve 34 is away from the clutch shaft 2, the shift fork 37 moves towards the clutch shaft 2. With the cooperation of the second guide surface 372 and the second fixing rod 39, the fork body 373 of the shift fork 37 moves upward, thereby lifting the clutch shaft 2 upward, so that the first clutch wheel 21 meshes with the motor transmission gear 11. When the linkage sleeve 34 is close to the clutch shaft 2, the shift fork 37 moves away from the clutch shaft 2. With the cooperation of the first guide surface 371 and the first fixing rod 38, the fork body 373 of the shift fork 37 moves downward, thereby pressing the clutch shaft 2 downward, so that the second clutch wheel 22 meshes with the drive transmission gear. It is worth noting that although the fork 373 can move closer to or further away from the clutch shaft 2, the length of the fork 373 is greater than the displacement length of the shift fork 37, so that the fork 373 can be placed on both sides of the clutch sleeve 23.In this embodiment, the clutch shaft 2 is rotatably connected to the bushing or bearing on the housing of the electric actuator. When the clutch shaft 2 moves downward to its limit position, the clutch wheel can be supported by the bushing and shift fork 37. Optionally, a spring 332 can also be fitted on the clutch shaft 2. When the clutch shaft 2 moves downward, the spring 332 is compressed. After the manual operation is completed, the spring 332 lifts the clutch shaft 2 upward, so that the clutch shaft 2 returns to its original position. The two ends of the spring 332 abut against the bushing and the first clutch wheel 21, respectively.

[0039] A stop sleeve 35 is also fitted on the drive shaft 33. The stop sleeve 35 can abut against the linkage sleeve 34. A crank handle is provided on the handwheel 31. The crank handle is hinged to the edge of the handwheel 31, and one end of the crank handle is connected to the stop sleeve 35 through a second connecting rod 322. The two ends of the second connecting rod 322 are respectively hinged to the crank handle and the stop sleeve 35. More specifically, in this embodiment, a hinge sleeve 321 is provided at the end of the crank handle. A hinge ear is fixed on the hinge sleeve 321. The second connecting rod 322 is hinged to the hinge sleeve 321 through the hinge ear. A connecting sleeve 36 is also fitted on the drive shaft 33. The connecting sleeve 36 is connected to the linkage sleeve 34 through a third connecting rod 361 and a fourth connecting rod 351. The sum of the lengths of the third connecting rod 361 and the fourth connecting rod 351 is greater than the minimum distance between the linkage sleeve 34 and the connecting sleeve 36. The ends of the second connecting rod 322, the third connecting rod 361, and the fourth connecting rod 351 are hinged to the same rotation center. A spring 332 is sleeved on the drive shaft 33, and the two ends of the spring 332 can abut against the drive gear 331 and the linkage sleeve 34 respectively.

[0040] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A device for quickly switching between manual and automatic modes of an electric actuator, characterized in that: include A drive shaft, on which a motor drive gear and a manual drive gear are fixed axially; A clutch shaft, along which a first clutch wheel and a second clutch wheel are fixedly mounted; The manual unit includes a handwheel and a drive shaft that rotates synchronously with the handwheel. When the second clutch wheel engages with the manual transmission gear, the drive shaft can drive the second clutch wheel to rotate. A linkage sleeve is fitted on the drive shaft. The linkage sleeve is connected to the outer end of a shift fork through a first connecting rod. When the linkage sleeve moves along the axial direction of the drive shaft, the shift fork can drive the clutch shaft to move along its own axial direction. The clutch shaft is placed in the space surrounded by the shift fork, so that the first clutch wheel or the second clutch wheel can mesh with the motor drive gear or the manual drive gear, respectively. The drive shaft is also fitted with a stop sleeve, which can abut against the linkage sleeve. The handwheel is provided with a crank handle, which is hinged to the edge of the handwheel. One end of the crank handle is connected to the stop sleeve through a second connecting rod, and the two ends of the second connecting rod are respectively hinged to the crank handle and the stop sleeve.

2. The electric actuator manual / automatic mode quick switching device according to claim 1, characterized in that: The drive shaft is provided with a drive gear at its end, and the drive shaft drives the drive gear to rotate by meshing with the second clutch wheel through the drive gear.

3. The electric actuator manual / automatic mode quick switching device according to claim 2, characterized in that: A spring is fitted onto the drive shaft, with its two ends abutting against the drive gear and the linkage sleeve, respectively.

4. The electric actuator manual / automatic mode quick switching device according to claim 1, characterized in that: The crank handle is provided with a hinge sleeve, and a hinge ear is fixed on the hinge sleeve. The second connecting rod is hinged to the hinge sleeve through the hinge ear.

5. The electric actuator manual / automatic mode quick switching device according to claim 4, characterized in that: A connecting sleeve is also fitted on the drive shaft. The connecting sleeve is connected to the linkage sleeve by a third link and a fourth link. The sum of the lengths of the third link and the fourth link is greater than the minimum distance between the linkage sleeve and the connecting sleeve. The ends of the second link, the third link and the fourth link are hinged to the same rotation center.

6. The electric actuator manual / automatic mode quick switching device according to claim 1, characterized in that: The clutch shaft is provided with a clutch sleeve, and the two ends of the clutch sleeve extend outward to form limiting edges, with the shift fork positioned between the two limiting edges.

7. The electric actuator manual / automatic mode quick switching device according to claim 1, characterized in that: The shift fork includes a fork body and a shift fork shaft, and the first connecting rod is rotatably connected to the shift fork shaft.

8. The electric actuator manual / automatic mode quick switching device according to claim 7, characterized in that: A guide sleeve is fitted onto the first connecting rod, and the guide sleeve is fixedly connected to the housing of the electric actuator.

9. The electric actuator manual / automatic mode quick switching device according to claim 8, characterized in that: A first fixing rod is provided above the shift fork, and a first guide surface is provided above the fork body. When the fork body moves away from the clutch shaft, the first fixing rod contacts the first guide surface, causing the end of the fork body away from the shift fork shaft to move downward.

10. A device for rapid switching between manual and automatic modes of an electric actuator according to claim 8, characterized in that: A second fixing rod is provided below the shift fork, and a second guide surface is provided below the fork body. When the fork body moves towards the clutch shaft, the second fixing rod contacts the second guide surface, causing the end of the fork body away from the shift fork shaft to move upward.

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