Valve actuator capable of ensuring stable execution

Abstract

The invention discloses a valve actuator capable of guaranteeing execution stability, and relates to the technical field of valve control, the valve actuator comprises a mounting box, a top partition plate is fixedly arranged at the top position of an inner cavity of the mounting box, a valve execution assembly is arranged at the top of the top partition plate, and the valve execution assembly can drive a plate valve to open or close the valve. The valve executing assembly comprises a power motor, a core screw cylinder, a butt joint cylinder and a driving block, the core screw cylinder is rotationally connected to the edge of the top of the top partition plate, the driving block is screwed into the outer wall of the core screw cylinder in a threaded mode, an extending block is fixedly arranged on one side face of the driving block, and the butt joint cylinder is fixedly arranged at the bottom of the extending block; a power motor is fixedly arranged at the top of the top partition plate, a power-off clutch assembly is arranged at the position, on the side face of the core screw cylinder, of the output end of the power motor, the core screw cylinder and the power motor are separated through the power-off clutch assembly when the whole valve execution assembly is powered off, and meanwhile workers can manually control the whole valve execution assembly conveniently.

Description

Technical Field

[0001] The present invention relates to the field of valve control technology, and in particular to a valve actuator capable of ensuring stable execution. Background Art

[0002] The working principle of the plate valve electric actuator is that the motor drives the screw to rotate forward and reverse, and the screw drives the output shaft of the electric actuator to move upward or downward accordingly, thereby completing the opening or closing of the valve. Once the power is cut off during the operation of the electric actuator, the motor cannot work normally, resulting in the valve cannot be opened and closed normally.

[0003] In the existing technology, when the power is cut off for the plate valve electric actuator, the valve plate controlled by the electric actuator is in an abnormal position. Some electric actuators are equipped with supercapacitors and reset controllers to complete their self-reset in the power-off state. However, when the electric actuator is placed in a low-temperature environment, the energy storage capacity of the supercapacitor is greatly reduced, which may cause abnormal resetting of the valve plate, and ultimately greatly reduce the stability and safety of the controlled system. Summary of the Invention

[0004] The purpose of the present invention is to solve the problem in the prior art that when the power is cut off, the valve plate controlled by the electric actuator is in an abnormal position. Some electric actuators are equipped with supercapacitors and reset controllers to complete their self-reset in the power-off state. However, when the electric actuator is placed in a low-temperature environment, the energy storage capacity of the supercapacitor is greatly reduced, which may cause abnormal resetting of the valve plate, and ultimately greatly reduce the stability and safety of the controlled system. A valve actuator that can ensure stable execution is proposed.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions: A valve actuator capable of ensuring stable execution, comprising an installation box, a top partition fixedly provided at the top of the inner cavity of the installation box, a valve actuator provided on top of the top partition, the valve actuator capable of driving a plate valve to open or close the valve, the valve actuator comprising a power motor, a core screw barrel, a docking barrel, and a drive block; The top edge of the top partition is rotatably connected to a core screw barrel, a driving block is screwed into the outer wall of the core screw barrel, an extension block is fixedly provided on one side of the driving block, a docking sleeve is fixedly provided on the bottom of the extension block, a power motor is fixedly provided on the top of the top partition, and a power-off clutch assembly is provided on the side of the core screw barrel at the output end of the power motor. When the power of the entire valve actuator is cut off, the power-off clutch assembly isolates the core screw barrel from the power motor, and at the same time facilitates manual operation of the entire valve actuator by personnel; An extension column is fixedly provided at one end of the driving block away from the extension block, and a power-off reset component is provided at the end of the extension column. The power-off reset component can control the valve to be in a fully open or fully closed state based on actual needs.

[0006] Optionally, the inner cavity of the docking tube is provided with an internal thread, the side wall of the docking tube is provided with a side hole, the extension block is movably inserted into a vertical column along the vertical direction, the bottom of the vertical column is fixedly connected to the bottom of the installation box, and the bottom of the installation box is provided with an avoidance hole, and the diameter of the avoidance hole is the same as the diameter of the docking tube.

[0007] Optionally, the power-off clutch assembly includes a clutch electromagnet, a driving gear, an intermediate gear, a top gear, a back-drive driving gear, a back-drive driven gear and a manual control assembly, and the manual control assembly allows manual control of the controlled valve when the entire valve actuator is powered off.

[0008] Optionally, a driving gear is fixedly provided at the output end of the power motor, a clutch electromagnet is fixedly provided on the top of the top partition on the side of the power motor, the head of the output end of the clutch electromagnet is rotatably connected to a vertical column, an intermediate gear and a back-drive driving gear are fixedly provided on the outer wall of the vertical column in sequence along the vertical direction, and a top gear and a back-drive driven gear are fixedly provided on the core barrel in sequence along the vertical direction.

[0009] Optionally, the manual control assembly includes a manual crank, a horizontal column, a vertical bevel gear, and a horizontal bevel gear. An extension box is fixedly provided on the side of the mounting box, a damping ring is fixedly provided on the side of the extension box, a horizontal column is rotatably connected inside the damping ring, a manual crank is fixedly provided at one end of the horizontal column, a vertical bevel gear is fixedly provided at the other end of the horizontal column, and a horizontal bevel gear is fixedly provided above the back-drive active gear on the vertical column.

[0010] Optionally, the power-off reset assembly includes a reset spring, a connecting ring, a vertical disk, a top boss, and a bottom boss. The end of the extension column is fixedly provided with a drive ring, the outer wall of the drive ring is rotatably connected to the connecting ring, and the top of the connecting ring is fixedly provided with a bottom boss.

[0011] Optionally, a driving column is fixedly provided on the side of the top boss, the vertical disk is fixedly connected to the side of the installation box, an arc-shaped half groove is opened on the side of the vertical disk, and a first connecting ring and a second connecting ring are fixedly provided at both ends of the arc-shaped half groove of the vertical disk, and the driving column extends into the interior of the arc-shaped half groove.

[0012] Optionally, the driving column is fixedly provided with an inner limit block on one side of the arc-shaped half groove, and the driving column is fixedly connected to an outer limit block on the other side of the arc-shaped half groove. An anti-breakage rod is fixedly provided on the top of the outer limit block, and a locking bolt is screwed into the top thread of the outer limit block. The diameter of the locking bolt is the same as the inner diameter of the first connecting ring and the second connecting ring.

[0013] Optionally, the outer wall of the bottom boss is fixedly connected to one end of a return spring, and the other end of the return spring is fixedly connected to the bottom of the top boss.

[0014] Optionally, a communication terminal is fixedly provided on the top of the side wall of the installation box, and the connecting wires of the power motor and the clutch electromagnet are connected to the communication terminal.

[0015] Optionally, the installation box is fixedly provided with a connection block on the top of the side of the vertical plate, and the side of the connection block is rotatably connected to a transparent protective cover.

[0016] Optionally, a docking seat is provided at the bottom of the installation box and fixed with bolts, a circular array of rectangular grooves is provided on the side of the docking seat, and a circular array of mounting holes is provided on the bottom of the docking seat.

[0017] Compared with the prior art, the present invention has the following advantages: 1. The present invention can control the executed valve through the valve execution assembly composed of a power motor, a docking sleeve, a drive block and other structures. At the same time, a power-off reset assembly is provided on the side of the drive block. The power-off reset assembly has three preset states, and the position of the valve plate after power-off reset can be preset according to actual user needs, that is, the valve plate is in a fully open or fully closed state. The power-off reset assembly does not rely on the supercapacitor and the reset controller to realize the power-off reset function. This not only avoids the reset abnormality problem caused by insufficient energy storage of the supercapacitor in a low-temperature environment, but also enhances the stability and reliability of the system, ensuring that the valve can automatically return to the preset safe position in the event of a power outage, reducing manual intervention and maintenance costs, and improving the safety and operational flexibility of the system.

[0018] 2. The present invention is provided with a power-off clutch assembly between the valve actuator assemblies. The power-off clutch assembly has rich functions. After the power motor providing power is powered off and stops, the power-off clutch assembly can cut off the power transmission between the power motor and the core screw barrel to avoid the power motor interfering with the core screw barrel. At the same time, the manual operation assembly in the power-off clutch assembly is connected to the core screw barrel that controls the valve displacement. When the entire actuator is normally powered on, the power-off clutch assembly separates the manual operation assembly from the core screw barrel to reduce the motor load. In the event of a power outage, the manual operation assembly can respond quickly, and the user can directly control the core screw barrel through the manual operation assembly to ensure that the valve can be quickly adjusted to a safe position, realize the displacement adjustment of the valve, and ensure that the valve can still be manually operated in the event of a power failure or emergency, thereby ensuring the normal operation of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0020] Figure 2 for Figure 1 Another perspective structural diagram.

[0021] Figure 3 for Figure 2 Another perspective structural diagram.

[0022] Figure 4 for Figure 3 Another perspective structural diagram.

[0023] Figure 5 for Figure 1 Schematic diagram of the half-section structure.

[0024] Figure 6 It is a structural diagram of the power-off reset component and its connecting parts.

[0025] Figure 7 It is a structural diagram of the power-off reset component.

[0026] Figure 8 It is a structural diagram of the vertical plate and its connecting parts.

[0027] Figure 9 It is a structural diagram of the power motor and its connecting parts.

[0028] Figure 10 It is a structural diagram of the vertical plate and connecting parts.

[0029] Figure 11 for Figure 10 Another perspective structural diagram.

[0030] In the figure: 1, communication terminal; 2, extension box; 3, installation box; 301, top partition; 4, adjustment slot; 5, connection block; 51, transparent protective cover; 6, avoidance hole; 7, rectangular slot; 8, docking seat; 9, vertical plate; 91, semi-arc slot; 92, first connecting ring; 93, second connecting ring; 10, manual crank; 101, damping ring; 11, horizontal column; 12, vertical bevel gear; 13, docking sleeve; 131, side hole; 14, extension block; 141, vertical column; 15, drive block; 16, extension Extension column; 17. Anti-breakage rod; 18. Outer limit block; 181. Locking bolt; 19. Inner limit block; 20. Drive column; 21. Drive ring; 22. Secondary cross bar; 23. Connecting ring; 24. Bottom boss; 25. Return spring; 26. Top boss; 27. Power motor; 28. Clutch electromagnet; 29. ​​Vertical column; 30. Driving gear; 31. Intermediate gear; 32. Horizontal bevel gear; 33. Back-drive driving gear; 34. Core screw barrel; 35. Top gear; 36. Back-drive driven gear. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0032] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying 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 direction, be constructed and operated in a specific direction, and therefore should not be understood as limiting the present invention.

[0033] Reference Figure 1-4 , a valve actuator that can ensure stable execution, includes an installation box 3, a top partition plate 301 is fixedly provided at the top position of the inner cavity of the installation box 3, a docking seat 8 is fixed at the bottom of the installation box 3 with bolts, an adjustment slot 4 is opened on the side of the installation box 3, a rectangular slot 7 is arranged in a circular array on the side of the docking seat 8, and a mounting hole is arranged in a circular array at the bottom of the docking seat 8. The entire valve actuator can be fixed to the top of the plate valve seat to be controlled by bolts and the mounting holes reserved at the bottom of the docking seat 8. When the top partition plate 301 is fixed to the inner cavity of the installation box 3, there is a certain distance between the top partition plate 301 and the end cover at the top of the installation box 3, leaving enough space for accommodating the following valve execution components. The main structure of the installation box 3 is a box body, and the end covers at both ends of the box body are fixedly connected by hexagon socket bolts.

[0034] Reference Figure 5-8 , a valve actuator is provided on the top of the top partition 301, which can drive the plate valve to open or close the valve. The valve actuator includes a power motor 27, a core screw barrel 34, a docking barrel 13, and a driving block 15. The core screw barrel 34 is rotatably connected to the top edge of the top partition 301, and the outer wall of the core screw barrel 34 is provided with an external thread. The driving block 15 is screwed into the outer wall of the core screw barrel 34, and an extension block 14 is fixedly provided on one side of the driving block 15. The bottom of the extension block 14 is fixedly provided with a docking barrel 13, and the inner cavity of the docking barrel 13 is provided with an internal thread. A side hole 131 is provided on the side wall of the docking barrel 13, and the extension block 14 is movably inserted with a vertical column 141 in the vertical direction. The bottom of the vertical column 141 is fixedly connected to the bottom of the installation box 3, and an avoidance hole 6 is provided at the bottom of the installation box 3. The diameter of the avoidance hole 6 is the same as the diameter of the docking barrel 13, and the vertical column 141 assists the extension block 14 to move in the vertical direction.

[0035] The output end of the power motor 27 is provided with a power-off clutch assembly on the side of the core screw barrel 34. The power-off clutch assembly includes a clutch electromagnet 28, a driving gear 30, an intermediate gear 31, a top gear 35, a back-drive driving gear 33, a back-drive driven gear 36 and a manual control assembly. The manual control assembly allows manual control of the controlled valve when the entire valve actuator is powered off. When selecting multiple gears, the number of teeth of the driving gear 30 is selected to be greater than the number of teeth of the intermediate gear 31 and the top gear 35. The number of teeth of the intermediate gear 31 and the top gear 35 is the same. When the power motor 27 rotates, the driving gear 30, the intermediate gear 31 and the top gear 35 can be used to drive the core screw barrel 34 to rotate slowly.

[0036] Referring to 9-11, the manual control assembly includes a manual crank 10, a horizontal column 11, a vertical bevel gear 12, and a horizontal bevel gear 32. An extension box 2 is fixedly provided on the side of the installation box 3, and a damping ring 101 is fixedly provided on the side of the extension box 2. The damping ring 101 is internally connected to the horizontal column 11 for rotation, and a manual crank 10 is fixedly provided at one end of the horizontal column 11. The friction force at the contact position between the damping ring 101 and the horizontal column 11 is set to be relatively large, which applies a certain damping to the rotation of the manual crank 10.

[0037] The other end of the horizontal column 11 is fixedly provided with a vertical bevel gear 12, and the vertical column 29 is fixedly provided with a horizontal bevel gear 32 above the back-drive active gear 33. The power-off clutch assembly isolates the core screw barrel 34 from the power motor 27 when the power is cut off from the entire valve actuator, and at the same time facilitates manual operation of the entire valve actuator by personnel. The output end of the power motor 27 is fixedly provided with a driving gear 30, and the top of the top partition 301 is fixedly provided with a clutch electromagnet 28 on the side of the power motor 27. The head of the output end of the clutch electromagnet 28 is rotatably connected to the vertical column 29. The outer wall of the vertical column 29 is fixedly provided with an intermediate gear 31 and a back-drive active gear 33 in sequence in the vertical direction, and the core screw barrel 34 is fixedly provided with a top gear 35 and a back-drive driven gear 36 in sequence in the vertical direction. The drive block 15 is fixedly provided with an extension column 16 at the end away from the extension block 14, and a power-off reset assembly is provided at the end of the extension column 16. The power-off reset assembly can control the valve to be fully open or fully closed based on actual needs.

[0038] The power-off reset assembly includes a reset spring 25, a connecting ring 23, a vertical disk 9, a top boss 26, and a bottom boss 24. A drive ring 21 is fixedly provided at the end of the extension column 16. The outer wall of the drive ring 21 is rotatably connected to the connecting ring 23. The top of the connecting ring 23 is fixedly provided with a bottom boss 24. The side of the top boss 26 is fixedly provided with a drive column 20. The vertical disk 9 is fixedly connected to the side of the installation box 3. An arc-shaped half groove 91 is provided on the side of the vertical disk 9. The vertical disk 9 is fixedly provided with a first connecting ring 92 and a second connecting ring 93 at both ends of the arc-shaped half groove 91. The first connecting ring 92 and the second connecting ring 93 are provided with internal threaded holes. The drive column 20 extends into the interior of the arc-shaped half groove 91. The diameter of the drive column 20 is the same as the width of the arc-shaped half groove 91. The arc-shaped half groove 91 is semicircular, and round ends are provided at both ends of the arc-shaped half groove 91.

[0039] The driving column 20 is fixedly provided with an inner limit block 19 on one side of the arc-shaped half groove 91, and the driving column 20 is fixedly connected to an outer limit block 18 on the other side of the arc-shaped half groove 91. The inner limit block 19 and the outer limit block 18 are fitted to the two side surfaces of the vertical disk 9 to limit the driving column 20 from rotating inside the arc-shaped half groove 91. The installation box 3 is fixedly provided with a connecting block 5 on the top of the side of the vertical disk 9. The side of the connecting block 5 is rotatably connected to a transparent protective cover 51. The transparent protective cover 51 is used to protect all components installed on the vertical disk 9.

[0040] An anti-break rod 17 is fixedly provided on the top of the outer limit block 18, and a locking bolt 181 is screwed into the top thread of the outer limit block 18. The diameter of the locking bolt 181 is the same as the inner diameter of the first connecting ring 92 and the second connecting ring 93. The outer wall of the bottom boss 24 is fixedly connected to one end of the return spring 25, and the other end of the return spring 25 is fixedly connected to the bottom of the top boss 26. A communication terminal 1 is fixedly provided on the top of the side wall of the installation box 3, and the connecting lines of the power motor 27 and the clutch electromagnet 28 are connected to the communication terminal 1. The top boss 26 and the bottom boss 24 have the appearance of a stepped column, and the diameter of the narrow end of the stepped column is the same as the diameter of the return spring 25. The anti-break rod 17 includes a vertical section and a horizontal section. The horizontal section of the anti-break rod 17 is on the side of the head of the locking bolt 181 to prevent the locking bolt 181 from being lost when it is unscrewed from the top of the outer limit block 18.

[0041] The length of the return spring 25 is set to be shorter and the elastic stiffness is set to be larger. At this time, the distance between the extension column 16 and the drive column 20 is the shortest, and the controlled valve plate will be controlled to the closest distance to the bottom of the installation box 3 or the closest distance to the top of the installation box 3.

[0042] The specific implementation steps and principles of the present invention are as follows: In the initial state, when the entire electric actuator is in the power supply state, by screwing the top thread of the valve plate of the plate valve into the interior of the docking sleeve 13, the clutch electromagnet 28 extends. Figure 10As shown, the driving gear 30, the intermediate gear 31, and the top gear 35 are all in a meshing state, the back-drive driving gear 33 is located obliquely below the back-drive driven gear 36, and the horizontal bevel gear 32 is located obliquely below the vertical bevel gear 12. At this time, human power rotation of the manual crank 10 cannot drive the core screw barrel 34 to rotate through the vertical bevel gear 12, the horizontal bevel gear 32, the back-drive driving gear 33, and the back-drive driven gear 36, and the core screw barrel 34 cannot drive the docking barrel 13 to move in the vertical direction through the driving block 15.

[0043] When the power motor 27 locks the core screw barrel 34 through the driving gear 30, the intermediate gear 31 and the top gear 35 through its own brake structure, the valve at the bottom of the driving block 15 is locked at a certain height.

[0044] If the user needs to reset the valve after power off, the valve is in a fully open state. At this time, it moves along the arc-shaped half groove 91, the outer limit block 18 moves to the top of the first connecting ring 92, the locking bolt 181 is screwed into the first connecting ring 92, and the top boss 26 is at the top of the bottom boss 24.

[0045] When the entire electric actuator is powered off, the clutch electromagnet 28 is powered off and in a retracted state, the intermediate gear 31 moves up, the driving gear 30, the intermediate gear 31, and the top gear 35 are in a separated state, the back-drive driving gear 33 is engaged with the back-drive driven gear 36, and the horizontal bevel gear 32 is engaged with the vertical bevel gear 12. At this time, manpower can rotate the manual crank 10 to drive the core screw barrel 34 to rotate through the vertical bevel gear 12, the horizontal bevel gear 32, the back-drive driving gear 33, and the back-drive driven gear 36 to operate the valve. The core screw barrel 34 is in a free state, and the reset spring 25 resets and drives the drive block 15 to move up, pulling the valve to the highest position in the vertical direction, and fully opening the plate valve.

[0046] If the user needs to reset after power off, the valve is in a fully closed state. At this time, it moves along the arc-shaped half groove 91, the outer limit block 18 moves to the top of the second connecting ring 93, and the locking bolt 181 is screwed into the inside of the second connecting ring 93. The top boss 26 is at the bottom of the bottom boss 24. When the entire electric actuator is powered off, the clutch solenoid 28 is powered off and in a retracted state. At this time, the mounting block 30 is close to the secondary crossbar 22, the intermediate gear 31 moves up, the driving gear 30, the intermediate gear 31, and the top gear 35 are in a separated state, the back-drive driving gear 33 is meshed with the back-drive driven gear 36, and the horizontal bevel gear 32 is meshed with the vertical bevel gear 12. At this time, manpower can rotate the manual crank 10 through the vertical bevel gear 12, the horizontal bevel gear 32, the back-drive driving gear 33, and the back-drive driven gear 36 to drive the core screw barrel 34 to rotate, thereby operating the valve. The core screw barrel 34 is in a free state, and the reset spring 25 resets and drives the drive block 15 to move upward, pulling the valve to the lowest position in the vertical direction, and completely closing the plate valve.

[0047] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A valve actuator capable of ensuring stable execution, comprising a mounting box, characterized in that: A top partition is fixedly provided at the top of the inner cavity of the installation box, and a valve actuator is provided on the top of the top partition. The valve actuator can drive the plate valve to open or close the valve. The valve actuator includes a power motor, a core screw barrel, a docking barrel, and a drive block; The top edge of the top partition is rotatably connected to a core screw barrel, a driving block is screwed into the outer wall of the core screw barrel, an extension block is fixedly provided on one side of the driving block, a docking sleeve is fixedly provided on the bottom of the extension block, a power motor is fixedly provided on the top of the top partition, and a power-off clutch assembly is provided on the side of the core screw barrel at the output end of the power motor. When the power of the entire valve actuator is cut off, the power-off clutch assembly isolates the core screw barrel from the power motor, and at the same time facilitates manual operation of the entire valve actuator by personnel; An extension column is fixedly provided at one end of the driving block away from the extension block, and a power-off reset component is provided at the end of the extension column. The power-off reset component can control the valve to be in a fully open or fully closed state based on actual needs.

2. A valve actuator capable of ensuring stable execution according to claim 1, characterized in that: The inner cavity of the docking tube is provided with an internal thread, and the side wall of the docking tube is provided with a side hole. The extension block is movably inserted with a vertical column in the vertical direction. The bottom of the vertical column is fixedly connected to the bottom of the installation box. The bottom of the installation box is provided with an avoidance hole, and the diameter of the avoidance hole is the same as the diameter of the docking tube.

3. A valve actuator capable of ensuring stable execution according to claim 1, characterized in that: The power-off clutch assembly includes a clutch electromagnet, a driving gear, an intermediate gear, a top gear, a back-drive driving gear, a back-drive driven gear and a manual control assembly. The manual control assembly allows manual control of the controlled valve when the entire valve actuator is powered off.

4. A valve actuator capable of ensuring stable execution according to claim 3, characterized in that: A driving gear is fixedly provided at the output end of the power motor, a clutch electromagnet is fixedly provided on the top of the top partition on the side of the power motor, the head of the clutch electromagnet output end is rotatably connected to a vertical column, an intermediate gear and a back-drive driving gear are fixedly provided on the outer wall of the vertical column in sequence along the vertical direction, and a top gear and a back-drive driven gear are fixedly provided on the core barrel in sequence along the vertical direction.

5. A valve actuator capable of ensuring stable execution according to claim 4, characterized in that: The manual control assembly includes a manual crank, a horizontal column, a vertical bevel gear, and a horizontal bevel gear. An extension box is fixedly provided on the side of the installation box, a damping ring is fixedly provided on the side of the extension box, and a horizontal column is rotatably connected inside the damping ring. A manual crank is fixedly provided at one end of the horizontal column, and a vertical bevel gear is fixedly provided at the other end of the horizontal column. A horizontal bevel gear is fixedly provided on the vertical column above the back-drive active gear.

6. A valve actuator capable of ensuring stable execution according to claim 1, characterized in that: The power-off reset assembly includes a reset spring, a connecting ring, a vertical disk, a top boss, and a bottom boss. The end of the extension column is fixedly provided with a driving ring, the outer wall of the driving ring is rotatably connected to the connecting ring, and the top of the connecting ring is fixedly provided with a bottom boss.

7. A valve actuator capable of ensuring stable execution according to claim 6, characterized in that: A driving column is fixedly provided on the side of the top boss, the vertical plate is fixedly connected to the side of the installation box, an arc-shaped half groove is opened on the side of the vertical plate, a first connecting ring and a second connecting ring are fixedly provided at both ends of the arc-shaped half groove, and the driving column extends into the interior of the arc-shaped half groove.

8. A valve actuator capable of ensuring stable execution according to claim 7, characterized in that: The driving column is fixedly provided with an inner limit block on one side of the arc-shaped half groove, and the driving column is fixedly connected to an outer limit block on the other side of the arc-shaped half groove. An anti-breakage rod is fixedly provided on the top of the outer limit block, and a locking bolt is screwed into the top thread of the outer limit block. The diameter of the locking bolt is the same as the inner diameter of the first connecting ring and the second connecting ring.

9. The valve actuator capable of ensuring stable execution according to claim 6, characterized in that: The outer wall of the bottom boss is fixedly connected to one end of the return spring, and the other end of the return spring is fixedly connected to the bottom of the top boss.

10. The valve actuator capable of ensuring stable execution according to claim 1, characterized in that: A communication terminal is fixedly provided on the top of the side wall of the installation box, and the connecting wires of the power motor and the clutch electromagnet are connected to the communication terminal.

11. A valve actuator capable of ensuring stable execution according to claim 1, characterized in that: The installation box is fixedly provided with a connecting block on the top of the side of the vertical plate, and the side of the connecting block is rotatably connected with a transparent protective cover.

12. The valve actuator capable of ensuring stable execution according to claim 1, characterized in that: A docking seat is fixedly provided at the bottom of the installation box by bolts. A circular array of rectangular grooves is provided on the side surface of the docking seat, and a circular array of mounting holes is provided on the bottom of the docking seat.

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