Valve driving executing mechanism

Abstract

According to the technical scheme, the valve driving executing mechanism is characterized by comprising a body, the body is provided with an executing box body, a worm gear structure and a worm structure, and the worm gear structure comprises an executing worm gear and a worm gear rotating shaft. A movable limiting structure matched with the valve actuator is arranged between the execution worm gear and the worm gear rotating shaft and comprises two worm gear movable protrusions fixedly arranged on the execution worm gear and two rotating shaft movable protrusions fixedly arranged on the worm gear rotating shaft, and the two worm gear movable protrusions and the two rotating shaft movable protrusions are matched with each other. The worm structure comprises a worm part matched with the execution worm gear, a worm gear part matched with the execution worm gear is arranged on the outer side of the execution worm gear, and the worm gear part and the worm part are connected in an engaged mode. The utility model has the effects that the structure is simple, the service life of the worm gear and the worm is prolonged, the transmission between the worm gear and the worm is more stable, and the valve state control is more accurate.

Description

TECHNICAL FIELD

[0001] The utility model relates to valve technical field, concretely relates to a valve drive actuating mechanism. BACKGROUND

[0002] At present, the Chinese patent with the announcement number CN 207569298 U discloses a kind of clutch formula valve drive device, it includes shell and the worm gear and worm that are installed in shell, the worm gear is sleeved on worm shaft and rotates synchronously with worm shaft, the part of worm shaft that extends out shell upper cover is equipped with first connecting part, the part of worm shaft that extends out shell lower cover is equipped with second connecting part;The worm is sleeved on worm shaft and rotates synchronously with worm shaft, worm shaft and worm shaft are arranged across, both ends of worm shaft that extend out shell all pass through eccentric block and are fixed on eccentric block, one end of worm shaft that extends out eccentric block is equipped with third connecting part;The eccentric block is fixedly installed on the front and rear sides of shell, and with fixed shaft as center, worm shaft is rotated in shell, to realize the meshing or separation of worm and worm gear.This device can be combined with pneumatic actuator or electric actuator to realize pneumatic manual or electric manual control to cut-off valve, structure is simplified, reliable in operation.

[0003] Although the patent can rotate worm shaft in shell with fixed shaft as center by eccentric block, to realize the meshing or separation of worm and worm gear, but the connecting part of worm and worm gear will be worn constantly in long time occlusion and separation process, shorten the service life of worm and worm gear, to reduce the stability of transmission between worm and worm gear and the control precision of valve. UTILITY MODEL CONTENTS

[0004] In view of the deficiencies in the prior art, the utility model provides a valve drive actuating mechanism, which has the advantages of simple structure, prolonged service life of worm and worm gear, smoother transmission between worm and worm gear, and more precise valve state control.

[0005] To achieve the above object, the utility model provides the following technical scheme: a valve drive execution mechanism, including the body, the body is provided with execution box body and the worm structure in the inside of execution box body, the worm structure includes execution worm and the worm shaft of being inserted in execution worm, execution worm is discoid structure setting, execution worm and worm shaft are provided with the movable limit structure of being suitable for valve actuator between, movable limit structure includes two worm movable protrusions of being fixed in execution worm and two shaft movable protrusions of being fixed in worm shaft, two worm movable protrusions and two shaft movable protrusions cooperate with each other, the valve rod through -hole of being suitable for valve stem is seted up on the worm shaft, valve stem passes through valve rod through -hole and is connected with valve actuator, the worm structure includes the worm part of being suitable for execution worm, the worm part of being suitable for it is seted up outside execution worm, and the worm part and the worm part are mutually engaged connection.

[0006] Through adopting the above technical scheme, set movable limit structure, when valve actuator controls the opening and closing of valve, execution worm does not rotate with worm shaft rotation, and then worm structure together with control hand wheel also does not rotate, when valve actuator stops working, worm structure rotates and drives execution worm to rotate, worm movable protrusion and shaft movable protrusion continuously close until contact, then drive shaft movable protrusion to rotate, until valve completes opening and closing work.

[0007] The utility model further sets up: execution worm middle part is seted up worm movable recess of being suitable for worm movable protrusion, and worm movable recess is discoid structure setting, and two worm movable protrusions are about worm movable recess center symmetry.

[0008] Through adopting the above technical scheme, two worm movable protrusions are about worm movable recess center symmetry, facilitate execution worm to drive worm shaft rotation and be more even under stress.

[0009] The utility model further sets up: worm shaft is seted up shaft movable convex ring of being suitable for shaft movable convex on the worm shaft, worm shaft, shaft movable convex ring and shaft movable protrusion are all one -piece structure setting, and two shaft movable protrusions are about shaft movable convex ring center symmetry, and shaft movable convex ring one side and worm movable recess mutually cooperate, and worm movable recess is seted up worm limit recess of being suitable for shaft movable convex ring in.

[0010] Through adopting the above technical scheme, two shaft movable protrusions are about shaft movable convex ring center symmetry, facilitate execution worm to drive worm shaft rotation and be more even under stress.

[0011] The present invention is further configured such that: worm rings integrally formed with the worm gear are provided on both sides of the worm gear part, a worm bearing adapted to the worm ring is provided on the outer side of the worm ring, and a worm connecting shaft adapted to the worm gear part is provided on one side of the worm gear part.

[0012] By adopting the above technical solution, the worm bearing ensures the smooth operation of the worm structure and the reliability of the transmission between the worm structure and the worm wheel structure. The worm connecting shaft is used to connect the control handwheel, making it convenient for operators to control the valve status.

[0013] The present invention is further configured such that: the execution housing includes a fixed housing and a worm gear end cover fixedly connected to the fixed housing, a worm gear cavity is formed between the fixed housing and the worm gear end cover, a first end cover sealing ring 411 is clamped at the connection between the worm gear end cover and the fixed housing, a first worm end cover and a second worm end cover are also provided on both sides of the fixed housing and fixedly connected thereto, a worm cavity is formed between the fixed housing, the first worm end cover and the second worm end cover, the worm cavity and the worm gear cavity are interconnected and respectively cooperate with the worm gear structure and the worm structure.

[0014] By adopting the above technical solution, the worm gear cavity and the worm shaft cavity are used to install and fix the worm gear structure and the worm shaft structure, respectively.

[0015] The present invention is further configured such that: the worm gear end cover, the first worm end cover, and the second worm end cover are all fixedly connected to the fixed housing by fixing bolts, and bolt washers adapted to them are also fitted on the fixing bolts; the worm gear end cover is fixedly provided with a first end cover protrusion ring that abuts against the other end of the movable protrusion ring of the rotating shaft; a first end cover through hole adapted to the worm gear rotating shaft is opened in the first end cover protrusion ring; the inner sides of the first worm end cover and the second worm end cover are provided with second end cover protrusion rings adapted to the worm bearing; a second end cover sealing groove is also opened on the outer side of the second end cover protrusion ring; a second end cover sealing ring adapted to the fixed housing is fitted on the second end cover sealing groove; the first worm end cover is also provided with a second end cover through hole adapted to the worm connecting shaft; a worm sealing ring fitted on the worm structure is also provided in the second end cover through hole; a worm sealing groove adapted to the worm sealing ring is opened on the worm structure.

[0016] By adopting the above technical solution, the fixing bolts and bolt washers cooperate to ensure the reliability of the connection, and the second end cap convex ring cooperates with the worm convex ring to prevent the worm bearing position from shifting, thus ensuring the reliability and stability of the worm structure operation.

[0017] The present invention is further configured such that: an integrally formed housing protrusion ring is provided on the inner side of the fixed housing, and the housing protrusion ring abuts against the side of the actuator worm gear away from the movable groove of the worm gear; an integrally formed actuator bracket is also provided on the outer side of the fixed housing, and the actuator bracket is fixedly connected to the valve actuator; and a housing through hole adapted to the worm gear shaft is provided on the fixed housing.

[0018] By adopting the above technical solution, the housing convex ring and the first end cover convex ring cooperate with each other to press the actuator worm gear and worm gear shaft into the worm gear cavity, ensuring stable transmission. The housing through hole facilitates the connection between the valve stem and the worm gear shaft.

[0019] The present invention is further configured such that: a plurality of matching shaft sealing grooves are provided on the outer side of the worm gear shaft, and a first shaft sealing ring and a second shaft sealing ring are respectively fitted inside the shaft sealing grooves to match the through hole of the housing and the first end cover protrusion ring.

[0020] By adopting the above technical solution, the first shaft seal ring and the second shaft seal ring improve the sealing performance between the worm gear shaft and the actuator housing.

[0021] The present invention is further configured such that: a protrusion adjustment block is provided on one side of the worm gear movable protrusion and is movably connected thereto; an adjustment connecting rod is provided on the side of the protrusion adjustment block near the worm gear movable protrusion and is integrally connected thereto; and a connecting rod groove adapted to the adjustment connecting rod is provided on the worm gear movable protrusion.

[0022] By adopting the above technical solution, the angle between the movable protrusion of the worm gear and the movable protrusion of the rotating shaft can be changed by adjusting the position of the protrusion adjustment block, so as to adapt to the valve state control of some valves with special requirements for the valve stem rotation angle.

[0023] The present invention is further configured such that: an adjustment limiting groove is provided on the adjustment connecting rod, both the adjustment limiting groove and the adjustment connecting rod are arc-shaped, and an adjustment bolt adapted to it is inserted through the adjustment limiting groove, the adjustment bolt passes through the adjustment limiting groove and is fixedly connected to the bottom of the connecting rod slide groove.

[0024] By adopting the above technical solution, the adjusting bolt and the adjusting limit groove work together to control the position of the adjusting protrusion, thereby controlling the angle of the movable angle to adapt to different angle requirements.

[0025] In summary, this utility model has the following beneficial effects:

[0026] 1. By setting a movable limit structure, when the valve actuator controls the opening and closing of the valve, the worm wheel will not rotate with the worm wheel shaft, and the worm structure and the control handwheel will not rotate. When the valve actuator stops working, the worm structure rotates and drives the worm wheel to rotate. The movable protrusion of the worm wheel and the movable protrusion of the shaft continue to approach until they contact each other, and then drive the movable protrusion of the shaft to rotate until the valve completes the opening and closing work.

[0027] 2. By ensuring that the two movable protrusions of the worm gear are symmetrical about the center of the movable groove of the worm gear, and that the two movable protrusions of the rotating shaft are symmetrical about the center of the movable ring of the rotating shaft, the force is more evenly distributed when the worm gear drives the worm gear shaft to rotate, thus ensuring transmission stability. Attached Figure Description

[0028] Figure 1 This is a perspective view of Example 1.

[0029] Figure 2 This is a top view of Example 1.

[0030] Figure 3 for Figure 2 A cross-sectional view at point AA.

[0031] Figure 4 for Figure 2 A cross-sectional view of section BB.

[0032] Figure 5 for Figure 2 A cross-sectional view at point CC.

[0033] Figure 6 This is a schematic diagram of opening the worm gear end cover in Example 1.

[0034] Figure 7 This is a schematic diagram of the connection between the worm gear structure and the worm shaft structure in Example 1.

[0035] Figure 8 This is a schematic diagram of the connection between the worm gear structure and the worm shaft structure in Example 2.

[0036] Figure 9 for Figure 8 A magnified view of a portion of point I in the middle.

[0037] Reference numerals: 1. Actuating worm gear; 11. Worm gear movable protrusion; 111. Connecting rod groove; 12. Worm gear movable groove; 121. Worm gear limiting groove; 13. Worm gear part; 2. Worm gear shaft; 21. Valve stem through hole; 22. Shaft movable protrusion; 23. Shaft movable convex ring; 24. First shaft sealing ring; 25. Second shaft sealing ring; 3. Worm structure; 31. Worm part; 32. Worm convex ring; 33. Worm bearing; 34. Worm connecting shaft; 4. Fixed housing; 41. Worm gear end cover; 411. First end cap sealing ring; 412. First end cap protruding ring; 413. First end cap through hole; 42. Worm gear cavity; 43. First worm end cap; 431. Second end cap protruding ring; 432. Second end cap sealing ring; 44. Second worm end cap; 45. Worm cavity; 46. Fixing bolt; 461. Bolt washer; 47. Housing protruding ring; 48. Actuating bracket; 481. Housing through hole; 5. Protrusion adjusting block; 51. Adjusting connecting rod; 511. Adjusting limit groove; 512. Adjusting bolt. Detailed Implementation

[0038] The present invention will be further described in detail below with reference to the accompanying drawings.

[0039] Example 1: This example discloses a valve drive actuator, such as... Figures 1 to 7 As shown, it includes a main body, which is equipped with an execution housing and a worm gear structure and a worm shaft structure 3 located inside the execution housing.

[0040] The worm gear structure includes an actuating worm gear 1 and a worm gear shaft 2 inserted on the actuating worm gear 1. The actuating worm gear 1 is arranged in a disc shape. A movable limiting structure adapted to the valve actuator is provided between the actuating worm gear 1 and the worm gear shaft 2. A valve stem through hole 21 adapted to the valve stem is opened on the worm gear shaft 2. The valve stem passes through the valve stem through hole 21 and is connected to the valve actuator.

[0041] The movable limiting structure includes two worm gear movable protrusions 11 fixed on the actuator worm gear 1 and two shaft movable protrusions 22 fixed on the worm gear shaft 2. The worm gear movable protrusions 11 and the shaft movable protrusions 22 cooperate to form a movable angle, the maximum angle of which is greater than 90 degrees. The two worm gear movable protrusions 11 and the two shaft movable protrusions 22 cooperate to control whether the body controls the opening and closing state of the valve. The actuator worm gear 1 has a worm gear movable groove 12 in the middle that is adapted to the worm gear movable protrusions 11. The worm gear movable groove 12 is circular in shape, and the two worm gear movable protrusions 11 are symmetrical about the center of the worm gear movable groove 12. The worm gear shaft 2 is provided with a shaft movable protrusion ring 23 that is adapted to it. The worm gear shaft 2, the shaft movable protrusion ring 23 and the two shaft movable protrusions 22 are all integral structures, and the two shaft movable protrusions 22 are symmetrical about the center of the shaft movable protrusion ring 23. The bottom of the worm gear movable groove 12 is also provided with a worm gear limiting groove 121 that abuts against the lower end face of the shaft movable protrusion ring 23.

[0042] The worm gear structure 3 includes a worm portion 31 adapted to the actuator worm wheel 1, and a worm wheel portion 13 adapted to the actuator worm wheel 1. The worm wheel portion 13 and the worm portion 31 are meshed together. Because the worm wheel portion 13 and the worm portion 31 are always meshed together, the transmission between the worm wheel structure and the worm gear structure 3 is smoother, the transmission efficiency is higher, and the wear at the connection between the worm wheel structure and the worm gear structure 3 is greatly reduced, thereby extending the service life of the worm wheel structure and the worm gear structure 3. The valve control effect is more precise. The two sides of the worm portion 31... The worm gear cam ring 32 is integrated with the worm gear 31. A worm bearing 33 is also provided on the outer side of the worm gear cam ring 32. The worm bearing 33 is used to reduce friction when the worm gear structure 3 rotates, so as to facilitate rotation and thus facilitate its smooth control of the valve state. The worm gear cam ring 32 can prevent the worm bearing 33 from sliding laterally, so as to ensure the reliability of the worm gear structure 3's operation. A worm connecting shaft 34 is also provided on one side of the worm part 31. The worm connecting shaft 34 is used to connect the control handwheel, which allows the operator to control the valve state.

[0043] The actuator housing includes a fixed housing 4 and a worm gear end cover 41 fixedly connected to the fixed housing 4. A worm gear cavity 42 is formed between the fixed housing 4 and the worm gear end cover 41. A first end cover sealing ring 411 is clamped at the connection between the worm gear end cover 41 and the fixed housing 4. The first end cover sealing ring 411 improves the sealing performance at the connection between the worm gear end cover 41 and the fixed housing. A first worm end cover 43 and a second worm end cover 44 are also provided on both sides of the fixed housing 4 and fixedly connected to it. A worm cavity 45 is formed between the fixed housing 4, the first worm end cover 43 and the second worm end cover 44. The worm cavity 45 and the worm gear cavity 42 interact with each other. The components are connected and respectively cooperate with the worm gear structure and worm structure 3. The worm gear end cover 41, the first worm end cover 43, and the second worm end cover 44 are all fixedly connected to the fixed housing 4 by fixing bolts 46. The fixing bolts 46 are also fitted with matching bolt washers 461. The inner side of the fixed housing 4 is also provided with an integral housing protrusion ring 47, which abuts against the actuator worm gear 1. The outer side of the fixed housing 4 is also provided with an integral actuator bracket 48, which is fixedly connected to the valve actuator. The actuator bracket 48 is used to install and fix the valve actuator. The fixed housing 4 has a housing through hole 481 adapted to the worm gear shaft 2. The worm gear end cover 41 has a first end cover protrusion ring 412 fixed on it, which abuts against the other end of the movable protrusion ring 23 of the shaft. The first end cover protrusion ring 412 has a first end cover through hole 413 adapted to the worm gear shaft 2. The first end cover through hole 413 facilitates the connection between the valve stem and the valve actuator. The inner sides of the first worm end cover 43 and the second worm end cover 44 are provided with second end cover protrusion rings 431 adapted to the worm bearing 33. The outer side of the second end cover protrusion ring 431 is also provided with a second end cover sealing groove. A second end cover sealing groove is fitted with a... A second end cap sealing ring 432 is adapted to the fixed housing 4. The second end cap sealing ring 432 improves the sealing performance at the connection between the first worm end cap 43 and the second worm end cap 44 and the fixed housing 4. The first worm end cap 43 is also provided with a second end cap through hole adapted to the worm connecting shaft 34. The second end cap through hole facilitates the assembly of the worm connecting shaft 34. A worm sealing ring 35 is also provided in the second end cap through hole and fitted onto the worm structure 3. A worm sealing groove adapted to the worm sealing ring 35 is provided on the worm structure 3. The worm sealing ring 35 improves the sealing performance at the connection between the worm structure and the second worm end cap 44.

[0044] The outer side of the worm gear shaft 2 is also provided with several matching shaft sealing grooves. The shaft sealing grooves are fitted with a first shaft sealing ring 24 and a second shaft sealing ring 25 that are respectively matched with the housing through hole 481 and the first end cover protrusion ring 412. The first shaft sealing ring 24 and the second shaft sealing ring 25 improve the sealing between the worm gear shaft 2 and the actuator housing.

[0045] The working process is as follows: The normal opening and closing angle of the valve is 0 to 90 degrees. When the valve actuator controls the opening and closing of the valve and the control handwheel is not in operation, the valve actuator drives the valve stem to rotate between 0 and 90 degrees to complete the valve status control. Therefore, the valve stem drives the worm gear shaft 2 to rotate between 0 and 90 degrees. Since the maximum angle between the movable protrusion 11 of the worm gear and the movable protrusion 22 of the shaft is greater than 90 degrees, the actuator worm gear 1 will not rotate with the worm gear shaft 2. Consequently, the worm structure 3 and the control handwheel will not rotate. The control handwheel and the valve actuator are relatively separated and do not affect each other. When the valve actuator stops working and the control handwheel controls the valve opening and closing state, the control handwheel drives the worm structure 3 to rotate, which in turn drives the actuator worm gear 1 to rotate. When the actuator worm gear 1 first starts to rotate, the movable protrusion 11 of the worm gear and the movable protrusion 22 of the shaft continue to approach each other until they contact. At this time, the rotation angle of the actuator worm gear 1 is greater than 90 degrees. Subsequently, the movable protrusion 11 of the worm gear drives the movable protrusion 22 of the shaft to rotate until the valve completes the opening and closing operation.

[0046] Example 2, this example is based on Example 1, such as... Figure 8 and 9 As shown, a worm gear movable protrusion 11 is provided with a protrusion adjustment block 5 movably connected to it on one side. An adjustment connecting rod 51 integrally formed with the worm gear movable protrusion 11 is provided on the side of the worm gear movable protrusion 11. A connecting rod groove 111 adapted to the adjustment connecting rod 51 is provided on the worm gear movable protrusion 11. An adjustment limit groove 511 is also provided on the adjustment connecting rod 51. Both the adjustment limit groove 511 and the adjustment connecting rod 51 are arc-shaped. An adjustment bolt 512 adapted to it is inserted through the adjustment limit groove 511. The adjustment bolt 512 passes through the adjustment limit groove 511 and is fixedly connected to the bottom of the connecting rod groove 111. By adjusting the position of the protrusion adjustment block 5, the angle of the movable angle between the worm gear movable protrusion 11 and the rotating shaft movable protrusion 22 can be changed to adapt to the valve state control of some valve stem rotation angle special requirements.

[0047] 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 design concept of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A valve drive actuator, comprising a body, an actuator housing, and a worm gear structure and a worm shaft structure (3) located inside the actuator housing, characterized in that: The worm gear structure includes an actuating worm gear (1) and a worm gear shaft (2) inserted on the actuating worm gear (1). The actuating worm gear (1) is arranged in a disc shape. A movable limiting structure adapted to the valve actuator is provided between the actuating worm gear (1) and the worm gear shaft (2). The movable limiting structure includes two worm gear movable protrusions (11) fixed on the actuating worm gear (1) and two shaft movable protrusions (22) fixed on the worm gear shaft (2). The movable protrusion (11) and the two rotating shaft movable protrusions (22) cooperate with each other. The worm gear shaft (2) is provided with a valve stem through hole (21) adapted to the valve stem. The valve stem passes through the valve stem through hole (21) and is connected to the valve actuator. The worm structure (3) includes a worm part (31) adapted to the actuator worm wheel (1). A worm wheel part (13) adapted to the actuator worm wheel (1) is provided on the outside of the actuator worm wheel (1). The worm wheel part (13) and the worm part (31) are meshed together.

2. The valve drive actuator according to claim 1, characterized in that: The worm gear (1) has a worm gear movable groove (12) in the middle that is adapted to the worm gear movable protrusion (11). The worm gear movable groove (12) is circular in structure, and the two worm gear movable protrusions (11) are symmetrical about the center of the worm gear movable groove (12).

3. The valve drive actuator according to claim 2, characterized in that: The worm gear shaft (2) is provided with a rotating shaft movable protrusion ring (23) that is adapted to the rotating shaft movable protrusion. The worm gear shaft (2), the rotating shaft movable protrusion ring (23) and the rotating shaft movable protrusion (22) are all integral structures. The two rotating shaft movable protrusions (22) are symmetrical about the rotating shaft movable protrusion ring (23). One side of the rotating shaft movable protrusion ring (23) cooperates with the worm gear movable groove (12). The worm gear movable groove (12) is provided with a worm gear limiting groove (121) that is adapted to the rotating shaft movable protrusion ring (23).

4. The valve drive actuator according to claim 1, characterized in that: The worm gear part (31) is provided with worm gear rings (32) integral with it on both sides. A worm gear bearing (33) adapted to it is also provided on the outer side of the worm gear ring (32). A worm gear connecting shaft (34) adapted to it is also provided on one side of the worm gear part (31).

5. A valve drive actuator according to claim 3, characterized in that: The execution housing includes a fixed housing (4) and a worm gear end cap (41) fixedly connected to the fixed housing (4). A worm gear cavity (42) is formed between the fixed housing (4) and the worm gear end cap (41). A first end cap sealing ring (411) is clamped at the connection between the worm gear end cap (41) and the fixed housing (4). A first worm end cap (43) and a second worm end cap (44) are also provided on both sides of the fixed housing (4) and fixedly connected to it. A worm cavity (45) is formed between the fixed housing (4), the first worm end cap (43), and the second worm end cap (44). The worm cavity (45) is interconnected with the worm gear cavity (42) and cooperates with the worm gear structure and the worm structure (3) respectively.

6. A valve drive actuator according to claim 5, characterized in that: The worm gear end cap (41), the first worm end cap (43), and the second worm end cap (44) are all fixedly connected to the fixed housing (4) by fixing bolts (46). A matching bolt washer (461) is fitted onto the fixing bolt (46). A first end cap protrusion (412) is fixed on the worm gear end cap (41) and abuts against the other end of the movable protrusion (23) of the rotating shaft. The first end cap protrusion (412) has an opening inside that matches the worm gear rotating shaft (2). The first end cover through hole (413), the inner side of the first worm end cover (43) and the second worm end cover (44) are provided with a second end cover protrusion ring (431) that is compatible with the worm bearing (33). The outer side of the second end cover protrusion ring (431) is also provided with a second end cover sealing groove. A second end cover sealing ring (432) that is compatible with the fixed housing (4) is fitted on the second end cover sealing groove. The first worm end cover (43) is also provided with a second end cover through hole that is compatible with the worm connecting shaft (34). A worm sealing ring (35) fitted on the worm structure (3) is also provided in the second end cover through hole. A worm sealing groove that is compatible with the worm sealing ring (35) is provided on the worm structure (3).

7. A valve drive actuator according to claim 6, characterized in that: The fixed housing (4) has an integral housing protrusion ring (47) on its inner side. The housing protrusion ring (47) abuts against the side of the actuator worm gear (1) away from the worm gear movable groove (12). The fixed housing (4) also has an integral actuator bracket (48) on its outer side. The actuator bracket (48) is fixedly connected to the valve actuator. The fixed housing (4) has a housing through hole (481) that is adapted to the worm gear shaft (2).

8. A valve drive actuator according to claim 7, characterized in that: The outer side of the worm gear shaft (2) is provided with several matching shaft sealing grooves. The shaft sealing grooves are fitted with a first shaft sealing ring (24) and a second shaft sealing ring (25) that are respectively matched with the housing through hole (481) and the first end cover protrusion ring (412).

9. A valve drive actuator according to any one of claims 1 to 8, characterized in that: A protrusion adjustment block (5) is provided on one side of the worm gear movable protrusion (11) and is movably connected thereto. An adjustment connecting rod (51) is provided on the side of the worm gear movable protrusion (11) that is integrated with it. A connecting rod groove (111) adapted to the adjustment connecting rod (51) is provided on the worm gear movable protrusion (11).

10. A valve drive actuator according to claim 9, characterized in that: The adjusting connecting rod (51) is also provided with an adjusting limiting groove (511). Both the adjusting limiting groove (511) and the adjusting connecting rod (51) are arranged in an arc shape. An adjusting bolt (512) adapted to it is inserted through the adjusting limiting groove (511). The adjusting bolt (512) passes through the adjusting limiting groove (511) and is fixedly connected to the bottom of the connecting rod slide groove (111).

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