A multi-stage limit pneumatic actuator and its limit execution method

Abstract

The present invention discloses a multi-stage limiting pneumatic actuator and a limiting execution method thereof. The device includes: a housing, a gas path connector provided on the housing, and an actuator installed in the housing; the actuator includes an execution part provided in the housing, a first limiting part and a second limiting part for limiting the movement stroke of the execution part; a regulating part connected to the execution part and a transmission part connected to the regulating part and used for regulating the first limiting part are further provided in the housing. The present invention completes the limitation of the execution shaft in the first direction and the second direction by designing the first limiting part and the second limiting part. At the same time, a transmission part is designed, so that when the same regulating part is in different positions, the limiting strokes of the primary limiting part and the secondary limiting part can be respectively regulated. Compared with the traditional method of using a gas source to maintain the opening and closing angle of the externally connected execution part, after the adjustment is completed in the present application, the input of the gas source can be abandoned, which is more cost-saving and has a better limiting effect.

Description

Technical Field

[0001] The present invention relates to the field of pneumatics, and particularly to a multi-stage limit pneumatic actuator and a limit execution method thereof. Background Art

[0002] A pneumatic actuator is an actuator that uses air pressure to drive the opening, closing or adjustment of a valve. It is also called a pneumatic actuator or a pneumatic device. It is a commonly used actuator in industrial automation control systems and is widely used in various pipelines, containers and equipment.

[0003] Pneumatic actuators include types such as cylinders, rotary actuators and valve actuators, among which the valve pneumatic actuator is the most common one.

[0004] However, after the traditional valve actuator drives the valve to a predetermined angle, it is necessary to maintain the opening and closing degree of the valve by continuously inputting air pressure, so that the entire pneumatic actuator is in a continuous working state, resulting in a waste of pneumatic resources. Summary of the Invention

[0005] Object of the Invention: To provide a multi-stage limit pneumatic actuator and a limit execution method thereof to solve the above problems existing in the prior art.

[0006] Technical Solution: A multi-stage limit pneumatic actuator includes:

[0007] A housing, a gas path connector provided on the housing, and an actuator installed in the housing;

[0008] The actuator includes an execution part provided in the housing, and a first limit part and a second limit part for limiting the movement stroke of the execution part;

[0009] The housing further is provided with an adjustment part connected to the execution part, and a transmission part connected to the adjustment part and used for adjusting the first limit part.

[0010] The present invention completes the first-direction and second-direction limits of the execution shaft by designing the first limit part and the second limit part. At the same time, a transmission part is designed, so that when the same adjustment part is in different positions, the limit strokes of the primary limit part and the secondary limit part can be respectively adjusted. Without changing the size of the actuator, multiple limit operations can be completed. Compared with the traditional method of using the air source to maintain the opening and closing angle of the externally connected execution part, after the adjustment is completed in this application, the input of the air source can be abandoned, which is more cost-saving and has a better limit effect.

[0011] In a further embodiment, the housing includes:

[0012] A ring shell, an end air passage and a middle air passage communicating with the air passage connecting member are arranged inside the ring shell, the end air passage extends to both ends of the ring shell, and the middle air passage extends to the middle position of the ring shell;

[0013] A scale is provided on the ring shell;

[0014] Notches adapted to the externally connected execution member and the adjusting sleeve are provided on both sides of the ring shell. The adjusting gear of the adjusting sleeve is located inside the ring shell, and the adjusting sleeve is located outside the ring shell.

[0015] When the pneumatic piston moves closer, the end air passage intakes air and the middle air passage exhausts air. When the pneumatic piston moves away, the middle air passage intakes air and the end air passage exhausts air.

[0016] End shells are installed at both ends of the ring shell. Air grooves communicating with the end air passage are formed inside the end shells to discharge the gas in the end air passage between the pneumatic piston and the ends, completing the movement of the pneumatic piston.

[0017] In a further embodiment, the execution part includes:

[0018] An execution shaft is arranged inside the ring shell. An externally connected execution member is provided at the end of the execution shaft, and shaft teeth are provided on the execution shaft;

[0019] A linkage block is sleeved on the execution shaft. A linkage gear ring adapted to the shaft teeth is arranged inside the linkage block, and eccentric piston grooves are formed at both ends of the linkage block;

[0020] Through the eccentric piston grooves, different torques can be corresponding to different angles of the externally connected execution member, making the opening and closing effect better.

[0021] Two groups of pneumatic pistons are designed to be centrosymmetric. Piston rods adapted to the piston grooves are provided at the ends of the pneumatic pistons.

[0022] In a further embodiment, the adjusting part includes:

[0023] An adjusting sleeve shaft is sleeved on the end of the execution shaft away from the externally connected execution member. An adjusting stepped shaft is provided at the end of the adjusting sleeve shaft, and adjusting teeth of a predetermined size are provided on the circumference of the adjusting stepped shaft; the length of the adjusting teeth is shorter than the length of the adjusting stepped shaft.

[0024] An adjusting sleeve is sleeved on the adjusting sleeve shaft and is slidably connected to the adjusting sleeve shaft. An adjusting tooth groove adapted to the adjusting teeth is formed inside the adjusting sleeve, and an adjusting gear is provided at the end of the adjusting sleeve. An indicating mark is provided on the adjusting sleeve. Through pre-calculation, the angle indication on the scale is made consistent with the output rotation angle of the externally connected execution member.

[0025] The interior of the adjusting sleeve is adapted to the adjusting sleeve shaft and the adjusting step shaft, and the distance between the adjusting tooth grooves is not longer than that of the adjusting teeth.

[0026] The adjusting sleeve drives the rotation of the adjusting sleeve shaft only when the adjusting tooth grooves are engaged with the adjusting teeth, and does not drive the rotation of the adjusting sleeve shaft when disengaged.

[0027] By designing the adjusting part, the same adjusting sleeve can be used to adjust the output end ratchet group, the adjusting end ratchet group and the first limiting part, making the entire actuator more integrated.

[0028] In a further embodiment, the first limiting part includes:

[0029] A first limiting gear, sleeved on the adjusting sleeve shaft;

[0030] The first-level limiting members, designed in two groups, are symmetrically arranged in the ring housing. Each group includes a first limiting ring frame, a first limiting block connected to the first limiting ring frame, and a first limiting column installed at the bottom of the first limiting block;

[0031] The second-level limiting members include an adjusting end ratchet group sleeved on the adjusting sleeve shaft and an output end ratchet group sleeved on the actuating shaft;

[0032] A slide rail is provided in the ring housing, and a slider connected to the first limiting block is adapted on the slide rail;

[0033] The first limiting column abuts against the end of the pneumatic piston.

[0034] By designing the cooperation of the first limiting part and the adjusting end ratchet group to work, the first-direction limiting of the actuating part is completed, avoiding that during the execution of the actuating part, the movement stroke is too long, resulting in too large a rotation angle of the actuating external part and causing the opening and closing degree of the valve not to reach the expected angle.

[0035] In a further embodiment, the adjusting end ratchet group includes an adjusting end ratchet sleeved on the adjusting sleeve shaft and located between the adjusting gear and the first limiting gear, and an adjusting end abutting block abutting against the adjusting end ratchet;

[0036] The output end ratchet group includes an output end ratchet sleeved on the actuating shaft and an output end abutting block abutting against the output end ratchet;

[0037] The ratchet teeth on the adjusting end ratchet and the output end ratchet face in opposite directions.

[0038] By designing two ratchet groups with opposite directions, the rotation angle limiting of the actuating external part is completed. When the adjusting end ratchet group works, it cooperates with the first limiting part to complete the first-direction limiting of the actuating part, while the output end ratchet group directly acts on the actuating shaft of the actuating part;

[0039] The adjusting end sprag group is designed to cooperate with the first limiting part during operation, so that the first limiting part does not affect the actuating shaft during the adjustment stroke, avoiding the problem of mutual interference.

[0040] In a further embodiment, the second limiting part includes:

[0041] A second limiting block, sleeved on the actuating shaft and in a rhombus shape;

[0042] Limiting bolts, designed in multiple groups, respectively screwed to the ring housing and located at the upper and lower ends of the second limiting block.

[0043] By designing the second limiting part, the work of the actuating part is completed again, and the rotation angle of the externally connected actuating part is limited again. Through the first direction, the second direction and the re-limiting, the actuating shaft can be fixed at an angle, which is more stable and more cost-saving compared with the traditional method of continuously outputting by the air source.

[0044] In a further embodiment, the transmission part includes:

[0045] An adjusting end transmission gear shaft, arranged inside the ring housing, close to the adjusting sleeve. An adjusting end transmission gear is sleeved on the adjusting end transmission gear shaft;

[0046] An adjusting end sprag shaft, arranged inside the ring housing, close to the adjusting sleeve. A sprag shaft transmission gear is sleeved on the adjusting end sprag shaft;

[0047] An output end sprag shaft, arranged inside the ring housing, far from the adjusting sleeve;

[0048] A transmission shaft, arranged inside the ring housing. An adjusting end transmission belt and an output end transmission belt are respectively arranged at both ends of the transmission shaft and are in transmission connection with the adjusting end transmission gear shaft and the adjusting end sprag shaft.

[0049] The adjusting end sprag shaft, the adjusting end transmission gear shaft, the output end sprag shaft and the transmission shaft are all inserted into the ring housing, and a predetermined damping force is designed during the assembly with the ring housing.

[0050] By designing the transmission part, the adjusting sleeve can adjust the output end sprag group.

[0051] In a further embodiment, the adjusting end abutting block is sleeved on the adjusting end sprag shaft;

[0052] The output end abutting block is sleeved on the output end sprag shaft;

[0053] The adjusting end transmission gear and the sprag shaft transmission gear are not in the same plane and are adapted to the adjusting gear.

[0054] A limiting pneumatic actuating method includes:

[0055] Step 1: Adjust the execution stroke of the execution part. When adjusting, adjust the position of the adjusting sleeve on the adjusting sleeve shaft so that the adjusting tooth groove meshes with the adjusting tooth. Rotate the adjusting sleeve to drive the adjusting sleeve shaft to rotate, drive the first limit gear to rotate, drive the first limit rack to move, and drive the first limit block to move to a predetermined position;

[0056] Step 2: Limit the first direction of the execution part. Adjust the position of the adjusting sleeve on the adjusting sleeve shaft so that the adjusting tooth groove is separated from the adjusting tooth, and make the adjusting gear mesh with the ratchet shaft transmission gear. Rotate the adjusting sleeve to drive the ratchet shaft transmission gear to rotate, drive the adjusting end ratchet shaft to rotate, drive the adjusting end abutting block to move, and make the adjusting end abutting block abut against the adjusting end ratchet wheel. When the execution part abuts against the first limit post, the first direction limit is completed;

[0057] Step 3: The execution part works, driving the execution external part to be selected to a predetermined angle. Inject gas into the gas path connector through an external air source. The gas enters both ends of the pneumatic piston through the end air passage, causing the two pneumatic pistons to move closer, thereby driving the linkage block to swing and driving the execution shaft to rotate until the pneumatic piston abuts against the first limit post, driving the execution external part to be selected to a predetermined angle;

[0058] The execution external part is externally connected to a valve. Through the rotation of the execution external part, the opening and closing of the valve are driven. A notch is opened in the execution external part, and it is adaptively connected to the valve stem or valve core of the valve through the notch, thereby completing the opening and closing work.

[0059] Step 4: Limit the second direction of the execution part. Adjust the position of the adjusting sleeve on the adjusting sleeve shaft so that the adjusting gear meshes with the adjusting end transmission gear. Rotate the adjusting sleeve to drive the adjusting end transmission gear to rotate, drive the adjusting end transmission tooth shaft to rotate, drive the adjusting end transmission belt to move, drive the transmission shaft to rotate, drive the output end transmission belt to move, drive the output end ratchet shaft to rotate, and drive the output end abutting block to abut against the output end ratchet wheel to complete the second direction limit of the execution part;

[0060] Step 5: Limit the execution part again. After the first direction and the second direction of the execution part are both limited, rotate the limit bolt so that the limit bolt abuts against the second limit block to complete the re - limiting work of the execution part. After limiting, the angle of the execution external part is maintained in the absence of a gas source.

[0061] Beneficial effects: The present invention discloses a multi-stage limit pneumatic actuator and its limit execution method. By designing a first limit part and a second limit part, the present invention completes the limit of the actuator shaft in the first direction and the second direction. At the same time, a transmission part is designed, so that when the same adjustment part is in different positions, the limit strokes of the primary limit part and the secondary limit part can be adjusted respectively. Without changing the size of the actuator, multiple limit operations can be completed. Compared with the traditional method of using a gas source to maintain the opening and closing angle of the externally connected actuator, after the adjustment is completed in this application, the input of the gas source can be abandoned, which is more cost-saving and has a better limit effect. Brief Description of the Drawings

[0062] Figure 1 is a schematic structural diagram of the present invention.

[0063] Figure 2 is a schematic structural diagram of the actuator mechanism of the present invention.

[0064] Figure 3 is a schematic structural diagram of the ring shell of the present invention.

[0065] Figure 4 is a schematic structural diagram of the actuator part of the present invention.

[0066] Figure 5 is a schematic structural diagram of the first limit part of the present invention.

[0067] Figure 6 is a schematic structural diagram of the transmission part and the adjustment part of the present invention.

[0068] Figure 7 is a schematic structural diagram of the adjustment end ratchet group and the output end ratchet group of the present invention.

[0069] Figure 8 is a schematic structural diagram of the second limit part of the present invention.

[0070] The reference numerals are:

[0071] 1, housing; 11, ring shell; 111, end air passage; 112, middle air passage; 12, end shell;

[0072] 2, air path connector;

[0073] 3, actuator mechanism;

[0074] 31, first limit part; 311, first limit ring frame; 312, first limit block; 313, first limit column; 314, first limit rack; 315, first limit gear;

[0075] 316, adjustment end ratchet group; 3161, adjustment end ratchet; 3162, adjustment end abutting block;

[0076] 317. Output end ratchet group; 3171. Output end ratchet; 3172. Output end abutting block;

[0077] 32. Execution part; 321. Execution shaft; 3211. Shaft teeth; 322. Execution external part; 323. Linking block; 3231. Linking toothed ring; 3232. Piston groove; 324. Pneumatic piston;

[0078] 33. Second limiting part; 331. Limiting bolt; 332. Second limiting block;

[0079] 34. Transmission part; 341. Transmission shaft; 342. Adjusting end transmission belt; 343. Adjusting end transmission gear; 344. Adjusting end transmission tooth shaft; 345. Adjusting end ratchet shaft; 346. Output end transmission belt; 347. Output end ratchet shaft; 348. Ratchet shaft transmission gear;

[0080] 35. Adjusting part; 351. Adjusting sleeve; 352. Adjusting tooth groove; 353. Adjusting gear; 354. Adjusting sleeve shaft; 355. Adjusting stepped shaft; 356. Adjusting tooth. Detailed implementation mode

[0081] This application relates to a multi-level limiting pneumatic actuator and its limiting execution method, which will be explained in detail below through specific implementation modes.

[0082] A multi-level limiting pneumatic actuator includes:

[0083] A housing 1, a gas path connecting piece 2 arranged on the housing 1, and an execution mechanism 3 installed in the housing 1;

[0084] The execution mechanism 3 includes an execution part 32 arranged in the housing 1, and a first limiting part 31 and a second limiting part 33 for limiting the movement stroke of the execution part 32;

[0085] A regulating part 35 connected to the execution part 32 and a transmission part 34 connected to the regulating part 35 and used for regulating the first limiting part 31 are further arranged in the housing 1.

[0086] The present invention completes the first-direction and second-direction limiting of the execution shaft 321 by designing the first limiting part 31 and the second limiting part 33. At the same time, the transmission part 34 is designed so that when the same regulating part 35 is in different positions, the limiting strokes of the primary limiting part and the secondary limiting part can be respectively regulated. Without changing the size of the actuator, multiple limiting operations can be completed. Compared with the traditional method of using a gas source to maintain the opening and closing angle of the execution external part 322, after the adjustment is completed in this application, the input of the gas source can be abandoned, which is more cost-saving and has a better limiting effect.

[0087] The housing 1 includes:

[0088] A ring shell 11, an end air passage 111 and a middle air passage 112 communicated with the air path connecting member 2 are arranged in the ring shell 11. The end air passage 111 extends to both ends of the ring shell 11, and the middle air passage 112 extends to the middle position of the ring shell 11;

[0089] A scale is arranged on the ring shell 11;

[0090] Both sides of the ring shell 11 are provided with notches adapted to the execution external member 322 and the adjustment sleeve 351. The adjustment gear 353 of the adjustment sleeve 351 is located inside the ring shell 11, and the adjustment sleeve 351 is located outside the ring shell 11.

[0091] When the pneumatic piston 324 moves closer, the end air passage 111 intakes air, and the middle air passage 112 exhausts air. When the pneumatic piston 324 moves away, the middle air passage 112 intakes air, and the end air passage 111 exhausts air.

[0092] End shells 12 are installed at both ends of the ring shell 11. Air grooves communicated with the end air passage 111 are formed in the end shells 12 to discharge the gas in the end air passage 111 between the pneumatic piston 324 and the ends, completing the movement of the pneumatic piston 324.

[0093] The execution part 32 includes:

[0094] An execution shaft 321 is arranged inside the ring shell 11. An execution external member 322 is arranged at the end of the execution shaft 321, and a shaft gear 3211 is arranged on the execution shaft 321;

[0095] A linkage block 323 is sleeved on the execution shaft 321. A linkage gear ring 3231 adapted to the shaft gear 3211 is arranged inside the linkage block 323, and eccentric piston grooves 3232 are formed at both ends of the linkage block 323;

[0096] Through the eccentric piston grooves 3232, different torques can be corresponding to different angles of the execution external member 322, making the opening and closing effect better.

[0097] Two groups of pneumatic pistons 324 are designed to be centrosymmetric. A piston rod adapted to the piston groove 3232 is arranged at the end of the pneumatic piston 324.

[0098] The adjustment part 35 includes:

[0099] An adjustment sleeve shaft 354 is sleeved on one end of the execution shaft 321 far from the execution external member 322. An adjustment step shaft 355 is arranged at the end of the adjustment sleeve shaft 354, and adjustment teeth 356 of a predetermined size are arranged on the circumference of the adjustment step shaft 355; the length of the adjustment teeth 356 is shorter than the length of the adjustment step shaft 355.

[0100] The adjusting sleeve 351 is sleeved on the adjusting sleeve shaft 354 and is slidably connected to the adjusting sleeve shaft 354. An adjusting tooth groove 352 adapted to the adjusting tooth teeth 356 is formed in the adjusting sleeve 351, and an adjusting gear 353 is provided at the end of the adjusting sleeve 351. An indicating mark is provided on the adjusting sleeve 351. Through pre-calculation, the angle indication on the scale is made consistent with the output rotation angle of the executing external member 322.

[0101] The interior of the adjusting sleeve 351 is adapted to the adjusting sleeve shaft and the adjusting stepped shaft 355, and the distance of the adjusting tooth groove 352 is not longer than that of the adjusting tooth teeth 356.

[0102] The adjusting sleeve 351 drives the adjusting sleeve shaft 354 to rotate only when the adjusting tooth groove 352 meshes with the adjusting tooth teeth 356, and does not drive the rotation of the adjusting sleeve shaft 354 when disengaged.

[0103] By designing the adjusting part 35, the same adjusting sleeve 351 can be used to adjust the output end ratchet group 317, the adjusting end ratchet group 316 and the first limiting part 31, making the integration of the entire executing rotation higher.

[0104] The first limiting part 31 includes:

[0105] The first limiting gear 315 is sleeved on the adjusting sleeve shaft 354;

[0106] The first-stage limiting members are designed in two groups and are symmetrically arranged in the ring housing 11. Each group includes a first limiting ring frame 311, a first limiting block 312 connected to the first limiting ring frame 311, and a first limiting column 313 installed at the bottom of the first limiting block 312;

[0107] The second-stage limiting members include an adjusting end ratchet group 316 sleeved on the adjusting sleeve shaft 354 and an output end ratchet group 317 sleeved on the executing shaft 321;

[0108] A slide rail is provided in the ring housing 11, and a slider connected to the first limiting block 312 is adapted on the slide rail;

[0109] The first limiting column 313 abuts against the end of the pneumatic piston 324.

[0110] By designing the first limiting part 31 to cooperate with the adjusting end ratchet group 316 to work, the first-direction limiting of the executing part 32 is completed, avoiding that during the execution of the executing part 32, the movement stroke is too long, resulting in too large a rotation angle of the executing external member 322 and causing the opening and closing degree of the valve not to reach the expected angle.

[0111] The adjusting end ratchet group 316 includes an adjusting end ratchet wheel 3161 sleeved on the adjusting sleeve shaft 354 and located between the adjusting gear 353 and the first limiting gear 315, and an adjusting end abutting block 3162 abutted against the adjusting end ratchet wheel 3161;

[0112] The output end ratchet group 317 includes an output end ratchet wheel 3171 sleeved on the actuating shaft 321, and an output end abutting block 3172 abutted against the output end ratchet wheel 3171;

[0113] The ratchet teeth on the adjusting end ratchet wheel 3161 and the output end ratchet wheel 3171 face in opposite directions.

[0114] By designing two ratchet groups with opposite directions, the rotational angle limit of the externally connected actuating member 322 is completed. When the adjusting end ratchet group 316 works, it cooperates with the first limiting portion 31 to complete the first-direction limit of the actuating portion 32, while the output end ratchet group 317 directly acts on the actuating shaft 321 of the actuating portion 32;

[0115] The adjusting end ratchet group 316 is designed to cooperate with the first limiting portion 31 during operation, so that the first limiting portion 31 does not affect the actuating shaft 321 during the adjustment stroke, avoiding the problem of mutual interference.

[0116] The second limiting portion 33 includes:

[0117] A second limiting block 332, sleeved on the actuating shaft 321, in a rhombus shape;

[0118] Limit bolts 331, designed in multiple groups, respectively screwed to the ring housing 11 and located at the upper and lower ends of the second limiting block 332.

[0119] By designing the second limiting portion 33, the operation of the actuating portion 32 is completed again, and the rotational angle of the externally connected actuating member 322 is limited again. Through the first direction, the second direction and the re-limitation, the actuating shaft 321 can be fixed at an angle, which is more stable and more cost-saving compared with the traditional method of continuously outputting by an air source.

[0120] The transmission portion 34 includes:

[0121] An adjusting end transmission gear shaft 344, arranged in the ring housing 11, close to the adjusting sleeve 351 side, and an adjusting end transmission gear 343 is sleeved on the adjusting end transmission gear shaft 344;

[0122] An adjusting end ratchet shaft 345, arranged in the ring housing 11, close to the adjusting sleeve 351 side, and a ratchet shaft transmission gear 348 is sleeved on the adjusting end ratchet shaft 345;

[0123] The output end ratchet shaft 347 is arranged inside the ring housing 11, on the side far from the adjusting sleeve 351;

[0124] The transmission shaft 341 is arranged inside the ring housing 11. At both ends of the transmission shaft 341, there are respectively an adjusting end transmission belt 342 and an output end transmission belt 346 which are in transmission connection with the adjusting end transmission gear shaft 344 and the output end ratchet shaft 345.

[0125] The adjusting end ratchet shaft 345, the adjusting end transmission gear shaft 344, the output end ratchet shaft 347, and the transmission shaft 341 are all inserted into the ring housing 11. When assembled with the ring housing 11, a predetermined damping force is designed.

[0126] By designing the transmission part 34, the adjusting sleeve 351 can adjust the output end ratchet group 317.

[0127] The adjusting end abutting block 3162 is sleeved on the adjusting end ratchet shaft 345;

[0128] The output end abutting block 3172 is sleeved on the output end ratchet shaft 347;

[0129] The adjusting end transmission gear 343 and the ratchet shaft transmission gear 348 are not in the same plane and are adapted to the adjusting gear 353.

[0130] A limiting pneumatic execution method includes:

[0131] Step 1: Adjust the execution stroke of the execution part 32. When adjusting, adjust the position of the adjusting sleeve 351 on the adjusting sleeve shaft 354 to make the adjusting tooth groove 352 engage with the adjusting tooth 356. Rotate the adjusting sleeve 351 to drive the adjusting sleeve shaft 354 to rotate, drive the first limiting gear 315 to rotate, drive the first limiting rack 314 to move, and drive the first limiting block 312 to move to a predetermined position;

[0132] Step 2: Limit the first direction of the execution part 32. Adjust the position of the adjusting sleeve 351 on the adjusting sleeve shaft 354 to separate the adjusting tooth groove 352 from the adjusting tooth 356, and make the adjusting gear 353 engage with the ratchet shaft transmission gear 348. Rotate the adjusting sleeve 351 to drive the ratchet shaft transmission gear 348 to rotate, drive the adjusting end ratchet shaft 345 to rotate, drive the adjusting end abutting block 3162 to move, and make the adjusting end abutting block 3162 abut against the adjusting end ratchet wheel 3161. When the execution part 32 abuts against the first limiting column 313, the first direction limit is completed;

[0133] Step 3: The actuator 32 operates to drive the execution external part 322 to select to a predetermined angle. Gas is injected into the gas path connector 2 through an external air source. The gas enters both ends of the pneumatic piston 324 through the end air duct 111, causing the two pneumatic pistons 324 to move closer, thereby driving the linkage block 323 to swing and driving the execution shaft 321 to rotate until the pneumatic piston 324 abuts against the first limit post 313, driving the execution external part 322 to select to a predetermined angle;

[0134] The execution external part 322 is externally connected to a valve. Through the rotation of the execution external part 322, the opening and closing of the valve are driven. A notch is opened in the execution external part 322 and is adaptively connected to the valve stem or valve core of the valve through the notch, thereby completing the opening and closing work.

[0135] Step 4: Limit the actuator 32 in the second direction. Adjust the position of the adjustment sleeve 351 on the adjustment sleeve shaft 354 so that the adjustment gear 353 meshes with the adjustment end transmission gear 343. Rotate the adjustment sleeve 351 to drive the adjustment end transmission gear 343 to rotate, drive the adjustment end transmission gear shaft 344 to rotate, drive the adjustment end transmission belt 342 to move, drive the transmission shaft 341 to rotate, drive the output end transmission belt 346 to move, drive the output end ratchet shaft 347 to rotate, and drive the output end abutting block 3172 to abut against the output end ratchet 3171 to complete the second-direction limit of the actuator 32;

[0136] Step 5: Limit the actuator 32 again. After the first-direction and second-direction limits of the actuator 32 are completed, rotate the limit bolt 331 so that the limit bolt 331 abuts against the second limit block 332 to complete the re-limiting work of the actuator 32. After the limit, the angle of the execution external part 322 is maintained in the absence of an air source.

[0137] Principle description:

[0138] Adjust the execution stroke of the actuator 32. During adjustment, adjust the position of the adjustment sleeve 351 on the adjustment sleeve shaft 354 so that the adjustment tooth groove 352 meshes with the adjustment tooth 356. Rotate the adjustment sleeve 351 to drive the adjustment sleeve shaft 354 to rotate, drive the first limit gear 315 to rotate, drive the first limit rack 314 to move, and drive the first limit block 312 to move to a predetermined position;

[0139] Limit the actuator 32 in the first direction. Adjust the position of the adjustment sleeve 351 on the adjustment sleeve shaft 354 so that the adjustment tooth groove 352 is separated from the adjustment tooth 356 and the adjustment gear 353 meshes with the ratchet shaft transmission gear 348. Rotate the adjustment sleeve 351 to drive the ratchet shaft transmission gear 348 to rotate, drive the adjustment end ratchet shaft 345 to rotate, drive the adjustment end abutting block 3162 to move, and make the adjustment end abutting block 3162 abut against the adjustment end ratchet 3161. When the actuator 32 abuts against the first limit post 313, the first-direction limit is completed;

[0140] The execution part 32 works, driving the execution external part 322 to be selected to a predetermined angle. Gas is injected into the gas path connector 2 through an external gas source. The gas enters both ends of the pneumatic piston 324 through the end air duct 111, causing the two pneumatic pistons 324 to move closer, thereby driving the linkage block 323 to swing and driving the execution shaft 321 to rotate until the pneumatic piston 324 abuts against the first limit post 313, driving the execution external part 322 to be selected to a predetermined angle;

[0141] The execution external part 322 is externally connected to a valve. Through the rotation of the execution external part 322, the opening and closing of the valve are driven. A notch is opened in the execution external part 322, and it is adaptively connected to the valve stem or valve core of the valve through the notch, thereby completing the opening and closing work.

[0142] Limit the second direction of the execution part 32. Adjust the position of the adjustment sleeve 351 on the adjustment sleeve shaft 354 so that the adjustment gear 353 meshes with the adjustment end transmission gear 343. Rotate the adjustment sleeve 351, driving the adjustment end transmission gear 343 to rotate, driving the adjustment end transmission gear shaft 344 to rotate, driving the adjustment end transmission belt 342 to move, driving the transmission shaft 341 to rotate, driving the output end transmission belt 346 to move, driving the output end ratchet shaft 347 to rotate, and driving the output end abutting block 3172 to abut against the output end ratchet wheel 3171 to complete the second direction limit of the execution part 32;

[0143] Limit the execution part 32 again. After the first direction and the second direction of the execution part 32 are both limited, rotate the limit bolt 331 so that the limit bolt 331 abuts against the second limit block 332 to complete the re - limitation work of the execution part 32. After the limitation, the angle of the execution external part 322 is maintained in the absence of a gas source.

[0144] The preferred embodiments of the present invention have been described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the specific details in the above - mentioned embodiments. Within the scope of the technical concept of the present invention, various equivalent transformations can be made to the technical solutions of the present invention, and these equivalent transformations all belong to the protection scope of the present invention.

Claims

1. A multi-stage limit pneumatic actuator, comprising: A housing (1), a gas path connector (2) arranged on the housing (1), and an actuator (3) installed in the housing (1); Characterized in that the actuator (3) comprises an actuator part (32) arranged in the housing (1), and a first limiting part (31) and a second limiting part (33) for limiting the movement range of the actuator part (32); The housing (1) is further provided with an adjusting portion (35) connected to the executing portion (32), and a transmission portion (34) connected to the adjusting portion (35) and used for adjusting the first limiting portion (31); The housing (1) comprises: An annular shell (11), wherein the annular shell (11) is provided with an end air passage (111) and a middle air passage (112) which are in communication with the air passage connection member (2), the end air passage (111) extending to both ends of the annular shell (11), and the middle air passage (112) extending to the middle position of the annular shell (11); The execution unit (32) comprises: An actuator shaft (321) is disposed in the annular housing (11); an actuator external connection member (322) is provided at the end of the actuator shaft (321); and shaft teeth (3211) are provided on the actuator shaft (321); A linkage block (323) is sleeved on the execution shaft (321), a linkage tooth ring (3231) adapted to the shaft tooth (3211) is provided in the linkage block (323), and eccentric piston grooves (3232) are formed at both ends of the linkage block (323); The pneumatic pistons (324) are designed in two groups and are centrally symmetrical. The ends of the pneumatic pistons (324) are provided with piston rods adapted to the piston grooves (3232); The adjustment unit (35) comprises: An adjusting sleeve shaft (354) is sleeved on an end of the actuating shaft (321) away from the actuating external connection member (322), an adjusting step shaft (355) being provided at the end of the adjusting sleeve shaft (354), and adjusting teeth (356) of a predetermined size being provided on the circumference of the adjusting step shaft (355); an adjusting sleeve (351) sleeved on the adjusting sleeve shaft (354) and slidably connected to the adjusting sleeve shaft (354); an adjusting tooth groove (352) adapted to the adjusting tooth teeth (356) is provided in the adjusting sleeve (351); and an adjusting gear (353) is provided at the end of the adjusting sleeve (351); The first limiting portion (31) comprises: A first limiting gear (315) sleeved on the adjusting sleeve shaft (354); The primary limiting member is designed in two groups and is symmetrically arranged in the ring shell (11), each group comprising a first limiting ring frame (311), a first limiting block (312) connected to the first limiting ring frame (311), and a first limiting column (313) installed at the bottom of the first limiting block (312); The secondary limiting member comprises an adjusting end spike group (316) sleeved on the adjusting sleeve shaft (354), and an output end spike group (317) sleeved on the execution shaft (321); The first limiting column (313) abuts against the end of the pneumatic piston (324); The adjusting end ratchet assembly (316) comprises an adjusting end ratchet (3161) sleeved on the adjusting sleeve shaft (354) and located between the adjusting gear (353) and the first limit gear (315), and an adjusting end abutting block (3162) abutting against the adjusting end ratchet (3161); The output end ratchet assembly (317) comprises an output end ratchet (3171) sleeved on the execution shaft (321), and an output end abutment block (3172) abutting against the output end ratchet (3171); The ratchet teeth on the regulating end ratchet (3161) and the output end ratchet (3171) face in opposite directions; The transmission part (34) comprises: An adjusting end transmission gear shaft (344) is arranged in the annular housing (11) and close to a side of the adjusting sleeve (351), and an adjusting end transmission gear (343) is sleeved on the adjusting end transmission gear shaft (344); An adjusting end ratchet shaft (345) is arranged in the annular housing (11) and close to a side of the adjusting sleeve (351), and a ratchet shaft transmission gear (348) is sleeved on the adjusting end ratchet shaft (345); An output-end ratchet shaft (347) is arranged in the annular housing (11) and is located away from a side of the adjustment sleeve (351); A transmission shaft (341) is disposed in the annular housing (11), and an adjustment end transmission belt (342) and an output end transmission belt (346) are respectively provided at both ends of the transmission shaft (341) and are transmission-connected to the adjustment end transmission gear shaft (344) and the output end ratchet shaft (347); The adjusting end abutment block (3162) is sleeved on the adjusting end ratchet shaft (345); The output end abutment block (3172) is sleeved on the output end ratchet shaft (347); The adjusting end transmission gear (343) and the ratchet shaft transmission gear (348) are not in the same plane and are adapted to the adjusting gear (353).

2. A multi-stage limit pneumatic actuator according to claim 1, characterized in that: The housing (1) comprises: The end shells (12) are mounted on both ends of the annular shell (11).

3. A multi-stage limit pneumatic actuator according to claim 2, characterized in that: A slide rail is provided in the annular shell (11), and a sliding block connected to the first limiting block (312) is adapted to be provided on the slide rail.

4. A multi-stage limit pneumatic actuator according to claim 3, characterized in that: The second limiting portion (33) comprises: The second limit block (332) is sleeved on the execution shaft (321) and is in a diamond shape; The limiting bolts (331) are designed in multiple groups and are respectively screwed to the annular shell (11) and are located at the upper and lower ends of the second limiting block (332).

5. A pneumatic limit actuator method, implemented based on the multi-stage pneumatic limit actuator device according to claim 4, characterized in that: include: Step 1, adjusting the execution stroke of the execution part (32). When adjusting, adjust the position of the adjustment sleeve (351) on the adjustment sleeve shaft (354) so ​​that the adjustment tooth groove (352) is meshed with the adjustment tooth teeth (356), and the adjustment sleeve (351) is rotated to drive the adjustment sleeve shaft (354) to rotate, drive the first limit gear (315) to rotate, drive the first limit rack (314) to move, and drive the first limit block (312) to move to a predetermined position; Step 2, limiting the actuator (32) in the first direction, adjusting the position of the adjusting sleeve (351) on the adjusting sleeve shaft (354), separating the adjusting tooth groove (352) from the adjusting tooth teeth (356), and meshing the adjusting gear (353) with the ratchet shaft transmission gear (348), rotating the adjusting sleeve (351), driving the ratchet shaft transmission gear (348) to rotate, driving the adjusting end ratchet shaft (345) to rotate, driving the adjusting end abutment block (3162) to move, causing the adjusting end abutment block (3162) to abut against the adjusting end ratchet wheel (3161), and when the actuator (32) abuts against the first limiting column (313), the first direction limiting is completed; Step 3: The actuator (32) operates to drive the actuator external component (322) to select a predetermined angle, and gas is injected into the gas path connector (2) through an external gas source. The gas enters the two ends of the pneumatic piston (324) through the end gas channel (111), causing the two pneumatic pistons (324) to move closer, thereby driving the linkage block (323) to swing, driving the actuator shaft (321) to rotate, until the pneumatic piston (324) abuts against the first limit column (313), driving the actuator external component (322) to select a predetermined angle; Step 4: limit the second direction of the actuator (32), adjust the position of the adjusting sleeve (351) on the adjusting sleeve shaft (354), make the adjusting gear (353) mesh with the adjusting end transmission gear (343), rotate the adjusting sleeve (351), drive the adjusting end transmission gear (343) to rotate, drive the adjusting end transmission gear shaft (344) to rotate, drive the adjusting end transmission belt (342) to move, drive the transmission shaft (341) to rotate, drive the output end transmission belt (346) to move, drive the output end ratchet shaft (347) to rotate, drive the output end abutment block (3172) to abut against the output end ratchet (3171), and complete the second direction limit of the actuator (32); Step 5, the actuator (32) is limited again. When the actuator (32) is limited in both the first direction and the second direction, the limiting bolt (331) is rotated so that the limiting bolt (331) abuts against the second limiting block (332), thereby completing the limiting work of the actuator (32). After limiting, in the absence of an air source, the angle of the actuator external component (322) is maintained.

Images