A manual direct drive structure of an electric actuator

Abstract

A manual direct-drive structure for an electric actuator includes a bearing housing. One end of the bearing housing is fixedly connected to a positioning seat on one side of the actuator by bolts. A cover is detachably installed on the other end of the bearing housing. The end of the cover extends radially to form a square rod I. An emergency handwheel is fitted onto the square rod I and is limited by a quick-release pin. A transmission rod is provided inside the actuator. The end of the transmission rod passes through the positioning seat and the bearing housing in sequence and extends into the cover. The transmission rod is connected to a gearbox through a connecting sleeve. A motor power assembly is also connected to the transmission rod. In case of power failure, the cover is removed, and the emergency handwheel is directly fitted onto the end of the transmission rod and limited by the quick-release pin. Rotating the emergency handwheel directly outputs power to the gearbox. This structure replaces the original handwheel transmission assembly by adding a bearing housing, a cover, and an emergency handwheel to the actuator. It does not use a clutch switching design, and the emergency handwheel can be directly fitted onto the end of the transmission rod to provide power, simplifying the structure.

Description

Technical Field

[0001] This invention relates to the field of motor actuators, and in particular to a manual direct drive structure for an electric actuator. Background Technology

[0002] An actuator is a drive device that actuates valves and is widely used in automated equipment. In existing technology, electric valve actuators are equipped with an electric-to-manual switching device for manual control when the electric actuator fails. Current electric-to-manual switching devices generally employ a clutch-disengaged handwheel design with an internal gearbox, resulting in a complex overall structure. Manual operation requires a large number of turns, increasing the operator's workload. Furthermore, if the clutch fails during electric operation, the manual wheel will still rotate, posing a safety hazard. Summary of the Invention

[0003] To address the shortcomings mentioned above, this invention provides a manual direct-drive structure for an electric actuator to ensure the service life of the valve stem.

[0004] To achieve the above objectives, the present invention provides a manual direct drive structure for an electric actuator, including a bearing housing. One end of the bearing housing is fixedly connected to a positioning seat on one side of the actuator by bolts. A cover is detachably installed on the other end of the bearing housing. The end of the cover extends radially to form a square rod I. An emergency handwheel is fitted on the square rod I and is limited by a quick-release pin.

[0005] The actuator is equipped with a transmission rod. The end of the transmission rod passes through the positioning seat and the bearing seat in sequence and then extends into the cover. The transmission rod is connected to the reduction gearbox through a connecting sleeve. A motor power assembly is also connected to the transmission rod. The reduction gearbox, the connecting sleeve, the motor power assembly, the transmission rod, and the emergency handwheel together form a transmission mechanism.

[0006] In the event of a power failure, the cover is removed, and the emergency handwheel is directly fitted onto the end of the transmission rod and limited by the quick-release pin. Rotating the emergency handwheel directly outputs power to the reduction gearbox.

[0007] As a further improvement of the present invention, the end of the transmission rod is machined into a square rod, and a square hole is machined at the center of the emergency handwheel, and the square rod matches the square hole.

[0008] As a further improvement of the present invention, a limiting hole is machined at the end of the square rod, and a through hole is machined at the end of the square rod I. Both the limiting hole and the through hole are matched with the quick release pin.

[0009] As a further improvement of the present invention, a positioning edge is provided on the outer circumference of the left part of the bearing seat, and the positioning edge is fixed to the end face of the positioning seat by bolts. An inner cavity is formed at the center of the bearing seat, and the transmission rod passes through the inner cavity. An external thread is machined on the outer circumference of the right part of the bearing seat.

[0010] As a further improvement of the present invention, the inner wall of the left part of the cover is machined with an internal thread that matches the external thread.

[0011] The beneficial effects of this invention are as follows:

[0012] This structure adds a bearing housing, a cover, and an emergency handwheel to the actuator. The transmission rod inside the actuator passes through the bearing housing and can be directly connected to the emergency handwheel. Functionally, it replaces the original handwheel transmission assembly. It does not use a clutch switching design to avoid the handwheel hitting the operator in case of clutch failure. In case of power failure, the emergency handwheel is directly fitted onto the end of the transmission rod to provide power, simplifying the structure and reducing the number of rotations of the emergency handwheel. When using a motor power assembly, a cover is installed at the end of the bearing housing, and the emergency handwheel is fitted onto the cover to keep the emergency handwheel stationary and prevent injury. Attached Figure Description

[0013] Figure 1 This is a structural diagram of an electric actuator in electric operation.

[0014] Figure 2 This is a structural diagram of an electric actuator in manual operation.

[0015] Figure 3 This is a schematic diagram of the transmission mechanism 2;

[0016] Figure 4 This is a sectional view of bearing housing 5;

[0017] Figure 5 This is a cross-sectional view of the cap 6;

[0018] Figure 6 Front view of emergency handwheel 7;

[0019] Figure 7 Side view of emergency handwheel 7;

[0020] Figure 8 This is a schematic diagram of the transmission mechanism in the prior art.

[0021] In the diagram: 1. Actuator; 2. Transmission mechanism; 21. Gearbox; 22. Connecting sleeve; 23. Motor power assembly; 24. Handwheel transmission assembly; 3. Positioning seat; 4. Transmission rod; 41. Square rod; 42. Limiting hole; 5. Bearing seat; 51. Positioning edge; 52. Inner cavity; 53. External thread; 6. Cover; 61. Internal thread; 62. Square rod I; 63. Through hole; 7. Emergency handwheel; 71. Square hole; 8. Quick release pin. Detailed Implementation

[0022] like Figure 1 As shown, the manual direct drive structure of the electric actuator of the present invention includes a bearing housing 5. One end of the bearing housing 5 is fixedly connected to the positioning seat 3 on one side of the actuator 1 by bolts. A positioning edge 51 is provided on the outer circumference of the left part of the bearing housing 5. The positioning edge 51 is fixed to the end face of the positioning seat 3 by bolts. An inner cavity 52 is formed at the center of the bearing housing 5. The transmission rod 4 passes through the inner cavity 52. ​​An external thread 53 is machined on the outer circumference of the right part of the bearing housing 5 (see...). Figure 4 The bearing housing 5 has a detachable cover 6 at the other end. The inner wall of the left side of the cover 6 is machined with an internal thread 61 that matches the external thread 53. The end of the cover 6 extends radially to form a square rod I 62 (see...). Figure 5 An emergency handwheel 7 is fitted onto square rod I62 and then limited by quick-release pin 8;

[0023] The actuator 1 has a transmission rod 4 inside. The end of the transmission rod 4 passes through the positioning seat 3 and the bearing seat 5 in sequence and then extends into the cover 6. The end of the transmission rod 4 is machined into a square rod 41. The emergency handwheel 7 has a square hole 71 machined at its center (see...). Figure 7 The square rod 41 matches the square hole 71. A limiting hole 42 is machined at the end of the square rod 41, and a through hole 63 is machined at the end of the square rod I 62. Both the limiting hole 42 and the through hole 63 match the quick-release pin 8. The transmission rod 4 is connected to the reduction gearbox 21 via the connecting sleeve 22. A motor power assembly 23 is also connected to the transmission rod 4. The reduction gearbox 21, connecting sleeve 22, motor power assembly 23, transmission rod 4, and emergency handwheel 7 together form the transmission mechanism 2 (see...). Figure 3 The motor power assembly 23 includes a motor, a worm gear, and a worm wheel, with the worm wheel mounted on the transmission rod 4;

[0024] In the event of a power failure, the cover 6 is removed, and the emergency handwheel 7 is directly fitted onto the end of the transmission rod 4 and limited by the quick-release pin 8. Rotating the emergency handwheel 7 directly outputs power to the reduction gearbox 21.

[0025] This structure adds a bearing housing, a cover, and an emergency handwheel to the actuator. The transmission rod inside the actuator passes through the bearing housing and can be directly connected to the emergency handwheel. Functionally, it replaces the original handwheel transmission assembly. It does not use a clutch switching design to avoid the handwheel hitting the operator in case of clutch failure. In case of power failure, the emergency handwheel is directly fitted onto the end of the transmission rod to provide power, simplifying the structure and reducing the number of rotations of the emergency handwheel. When using a motor power assembly, a cover is installed at the end of the bearing housing, and the emergency handwheel is fitted onto the cover to keep the emergency handwheel stationary and prevent injury.

[0026] In practical use, the invention will be described in conjunction with the accompanying drawings for ease of understanding;

[0027] like Figure 8 As shown, in the existing transmission mechanism 2, a handwheel transmission assembly 24 is provided on the transmission rod 4. The handwheel transmission assembly 24 includes a clutch, a switching lever, an internal reduction gearbox, and a handwheel. During electric operation, the motor inputs power to the worm gear, which reduces the speed and then transmits the power to the transmission rod 4. The transmission rod 4 outputs power to the reduction gearbox 21 through the connecting sleeve 22. After reduction by the reduction gearbox 21, the power is transmitted to the output shaft. During manual operation, the switching lever is rotated to disengage the clutch from the worm gear and engage the gear in the internal reduction gearbox. The handwheel is rotated, and the power from the handwheel is transmitted to the transmission rod 4 through the internal reduction gearbox. The transmission rod 4 outputs power to the reduction gearbox 21 through the connecting sleeve 22. After reduction by the reduction gearbox 21, the power is transmitted to the output shaft to open and close the valve.

[0028] In the structure of this invention, the power transmission structure during electric operation is the same as that in the prior art. The difference is that during manual operation, the emergency handwheel is first used to unscrew the cover. At this time, the cover and the emergency handwheel are connected by a quick-release pin. The quick-release pin is manually removed to separate the emergency handwheel and the cover. The separated emergency handwheel is then fitted onto the end of the transmission rod and the quick-release pin is inserted. The emergency handwheel is then rotated to open and close the valve.

[0029] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A hand drive structure of an electric actuator, characterized by: Includes a bearing housing (5), one end of which is fixedly connected to a positioning seat (3) on one side of the actuator (1) by bolts, and the other end of the bearing housing (5) is detachably fitted with a cover (6), the end of which extends radially to form a square rod I (62), and an emergency handwheel (7) is fitted on the square rod I (62) and then limited by a quick release pin (8); The actuator (1) is provided with a transmission rod (4). The end of the transmission rod (4) passes through the positioning seat (3) and the bearing seat (5) in sequence and then extends into the cover (6). The transmission rod (4) is connected to the gearbox (21) through the connecting sleeve (22). The transmission rod (4) is also connected to the motor power assembly (23). The gearbox (21), the connecting sleeve (22), the motor power assembly (23), the transmission rod (4), and the emergency handwheel (7) together form the transmission mechanism (2). The bearing housing (5) is threadedly connected to the cover (6); The transmission rod (4) is machined into a square rod (41) at the end, and a limiting hole (42) is machined at the end of the square rod (41). A through hole (63) is machined at the end of the square rod I (62). The limiting hole (42) and the through hole (63) are both matched with the quick release pin (8). When power is lost, the cover (6) is removed, the emergency handwheel (7) is directly sleeved on the end of the transmission rod (4) and limited by the quick release pin (8), and the emergency handwheel (7) is rotated to directly output power to the gearbox (21).

2. The manual direct drive structure of an electric actuator according to claim 1, characterized in that: The emergency handwheel (7) has a square hole (71) machined at its center, and the square rod (41) matches the square hole (71).

3. The manual direct drive structure of an electric actuator according to claim 1, characterized in that: The bearing seat (5) has a positioning edge (51) on the outer circumference of the left side. The positioning edge (51) is fixed to the end face of the positioning seat (3) by bolts. An inner cavity (52) is formed at the center of the bearing seat (5). The transmission rod (4) passes through the inner cavity (52). An external thread (53) is formed on the outer circumference of the right side of the bearing seat (5).

4. The manual direct drive structure of an electric actuator according to claim 3, characterized in that: The inner wall of the left side of the cover (6) is machined with an internal thread (61) that matches the external thread (53).

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