Multi-stage limiting pneumatic execution device and limiting execution method thereof

Abstract

The invention discloses a multistage limiting pneumatic execution device and a limiting execution method thereof. The multistage limiting pneumatic execution device comprises a shell, a gas circuit connecting piece arranged on the shell and an execution mechanism installed in the shell. The executing mechanism comprises an executing part arranged in the shell, and a first limiting part and a second limiting part which are used for limiting the motion stroke of the executing part; the shell is further internally provided with an adjusting part connected with the execution part and a transmission part connected with the adjusting part and used for adjusting the first limiting part. The first limiting part and the second limiting part are designed to limit the execution shaft in the first direction and the second direction, and meanwhile, the transmission part is designed, so that when the same adjusting part is located at different positions, the limiting strokes of the first-stage limiting piece and the second-stage limiting piece can be adjusted correspondingly; compared with a traditional mode that an air source is used for maintaining the opening and closing angle of the execution external connecting piece, after adjustment is completed, input of the air source can be abandoned, more cost is saved, and the limiting effect is better.

Description

Technical Field

[0001] The invention relates to the field of pneumatics, and in particular to a multi-stage position-limiting pneumatic actuator and a position-limiting execution method thereof. Background Art

[0002] Pneumatic actuators are actuators that use air pressure to open, close or adjust valves. They are also called pneumatic actuators or pneumatic devices. They are commonly used actuators in industrial automation control systems and are widely used in various pipelines, containers and equipment.

[0003] Pneumatic actuators include cylinders, rotary actuators and valve actuators, among which valve pneumatic actuators are the most common type.

[0004] After the traditional valve actuator drives the valve to a predetermined angle, it needs to continuously input air pressure to maintain the opening and closing degree of the valve, so that the entire pneumatic actuator is in a continuous working state, resulting in a waste of pneumatic resources. Summary of the invention

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

[0006] Technical solution: A multi-stage limit pneumatic actuator, comprising:

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

[0008] The actuator comprises an actuator part arranged in the housing, and a first limit part and a second limit part for limiting the movement range of the actuator part;

[0009] The housing also includes an adjusting portion connected to the executing portion, and a transmission portion connected to the adjusting portion and used to adjust the first limiting portion.

[0010] The present invention completes the limiting of the first direction and the second direction of the execution shaft by designing the first limiting part and the second limiting part, and designs the transmission part at the same time, so that when the same adjustment part is in different positions, the limiting strokes of the first limiting part and the second limiting part can be adjusted respectively, and multiple limiting operations can be completed without changing the size of the execution device. Compared with the traditional use of air source to maintain the opening and closing angle of the execution external parts, the present application can abandon the input of air source after the adjustment is completed, which is more cost-effective and has a better limiting effect.

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

[0012] An annular shell, wherein the annular shell is provided with an end airway and a middle airway which are connected with the airway connector, the end airway extends to both ends of the annular shell, and the middle airway extends to the middle position of the annular shell;

[0013] The ring housing is provided with a scale;

[0014] Two sides of the annular shell are provided with notches adapted to the externally connected actuator and the adjusting sleeve. The adjusting gear of the adjusting sleeve is located inside the annular shell, and the adjusting sleeve is located outside the annular shell.

[0015] When the pneumatic piston moves toward, air is taken in through the end air passage and exhaust is discharged through the middle air passage; when the pneumatic piston moves away, air is taken in through the middle air passage and exhaust is discharged through the end air passage.

[0016] The end shell is installed at both ends of the annular shell. An air groove connected with the end air channel is opened in the end shell to discharge the gas in the end air channel into the space between the pneumatic piston and the end to complete the movement of the pneumatic piston.

[0017] In a further embodiment, the execution unit comprises:

[0018] An actuator shaft is arranged in the annular housing, an actuator external connection piece is arranged at the end of the actuator shaft, and shaft teeth are arranged on the actuator shaft;

[0019] A linkage block is sleeved on the actuator shaft, wherein a linkage gear ring matching the shaft gear is arranged in the linkage block, and eccentric piston grooves are provided at both ends of the linkage block;

[0020] Through the eccentrically designed piston groove, different torques can be matched according to the different angles of the external parts, so that the opening and closing effect is better.

[0021] The pneumatic pistons are designed in two groups, which are centrally symmetrical. The ends of the pneumatic pistons are provided with piston rods which are matched with the piston grooves.

[0022] In a further embodiment, the adjusting portion comprises:

[0023] The adjusting sleeve shaft is sleeved on the end of the executing shaft away from the executing external component. The end of the adjusting sleeve shaft is provided with an adjusting step shaft. The adjusting step shaft is provided with adjusting teeth of a predetermined size on the circumference. The length of the adjusting teeth is shorter than the length of the adjusting step shaft.

[0024] The adjusting sleeve is sleeved on the adjusting sleeve shaft and is slidably connected with the adjusting sleeve shaft. The adjusting sleeve has an adjusting tooth groove adapted to the adjusting tooth. The end of the adjusting sleeve is provided with an adjusting gear. The adjusting sleeve is provided with an indicator mark. Through pre-calculation, the angle indication on the scale is consistent with the output rotation angle of the external actuator.

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

[0026] The adjusting sleeve drives the adjusting sleeve shaft to rotate only when the adjusting tooth groove is engaged with the adjusting teeth, and does not drive the adjusting sleeve shaft to rotate when it is disengaged.

[0027] By designing the adjustment part, the same adjustment sleeve can be used to adjust the output end spike group, the adjustment end spike group and the first limit part, so that the entire actuator is more integrated.

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

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

[0030] The primary limiting member is designed in two groups and symmetrically arranged in the ring shell, 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 secondary limiting member comprises an adjusting end ratchet group sleeved on the adjusting sleeve shaft, and an output end ratchet group sleeved on the executing shaft;

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

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

[0034] By designing the first limit part to cooperate with the adjustment end ratchet group, the first direction limit of the actuator is completed, which avoids the actuator from moving too long during the execution process, causing the actuator external component to rotate too much, resulting in the valve opening and closing degree not reaching the expected angle.

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

[0036] The output end ratchet group includes an output end ratchet wheel sleeved on the execution shaft, and an output end abutment block abutting against the output end ratchet wheel;

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

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

[0039] The adjusting end spike group is designed to cooperate with the first limiting part during operation, so that the first limiting part does not affect the execution axis when adjusting the stroke, thereby avoiding the problem of mutual interference.

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

[0041] The second limit block is sleeved on the execution shaft and is in a diamond shape;

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

[0043] By designing a second limiting portion, the work of the actuator is completed again, and the rotation angle of the external component is limited again. Through the first direction, the second direction and the second limiting, the actuator axis can be fixed at an angle. Compared with the traditional method of using continuous output of the air source, it is more stable and more cost-effective.

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

[0045] An adjusting end transmission gear shaft is arranged in the annular housing, close to one side of the adjusting sleeve, and an adjusting end transmission gear is sleeved on the adjusting end transmission gear shaft;

[0046] An adjusting end ratchet shaft is arranged in the annular housing, close to one side of the adjusting sleeve, and a ratchet shaft transmission gear is sleeved on the adjusting end ratchet shaft;

[0047] An output end ratchet shaft is arranged in the annular housing and away from the adjusting sleeve;

[0048] The transmission shaft is arranged in the annular shell, and the two ends of the transmission shaft are respectively provided with an adjustment end transmission belt and an output end transmission belt which are transmission-connected with the adjustment end transmission gear shaft and the adjustment end ratchet shaft.

[0049] The adjusting end ratchet shaft, the adjusting end transmission gear shaft, the output end ratchet shaft and the transmission shaft are all plugged into the ring shell, and a predetermined damping force is designed when they are assembled with the ring shell.

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

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

[0052] The output end abutment block is sleeved on the output end ratchet shaft;

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

[0054] A pneumatic limit execution method, comprising:

[0055] Step 1, adjusting the execution stroke of the actuator. During the adjustment, adjust the position of the adjusting sleeve on the adjusting sleeve shaft so that the adjusting tooth groove is engaged with the adjusting tooth teeth, rotate the adjusting sleeve, 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 actuator in the first direction, adjust the position of the adjusting sleeve on the adjusting sleeve shaft, separate the adjusting tooth groove from the adjusting tooth teeth, and mesh the adjusting gear with the ratchet shaft transmission gear, rotate the adjusting sleeve, drive the ratchet shaft transmission gear to rotate, drive the adjusting end ratchet shaft to rotate, drive the adjusting end abutment block to move, make the adjusting end abutment block abut against the adjusting end ratchet wheel, and when the actuator abuts against the first limiting column, the first direction limit is completed;

[0057] Step 3: The actuator works, driving the external actuator to select a predetermined angle, injecting gas into the gas path connector through an external gas source, and the gas enters the two ends of the pneumatic piston through the end gas channel, so that the two pneumatic pistons move close to each other, thereby driving the linkage block to swing, driving the actuator shaft to rotate, until the pneumatic piston abuts against the first limit column, driving the external actuator to select a predetermined angle;

[0058] The external actuator is connected to the external valve, and the valve is opened and closed by rotating the external actuator. A slot is provided inside the external actuator, and the slot is adapted to connect with the valve stem or valve core of the valve to complete the opening and closing work.

[0059] Step 4: limit the second direction of the actuator, adjust the position of the adjusting sleeve on the adjusting sleeve shaft, make the adjusting gear mesh with the adjusting end transmission gear, rotate the adjusting sleeve, drive the adjusting end transmission gear to rotate, drive the adjusting end transmission gear 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, drive the output end abutment block to abut the output end ratchet, and complete the second direction limit of the actuator;

[0060] Step 5, limit the actuator again. When the actuator is limited in the first direction and the second direction, rotate the limit bolt to make the limit bolt abut against the second limit block to complete the re-limiting work of the actuator. After limiting, maintain the angle of the actuator external component in the absence of air source.

[0061] Beneficial effect: The present invention discloses a multi-stage limit pneumatic actuator and a limit execution method thereof. The present invention completes the first direction and the second direction limit of the actuator shaft by designing a first limit part and a second limit part, and designs a transmission part at the same time, so that when the same adjustment part is in different positions, the limit strokes of the first limit part and the second limit part can be adjusted respectively, and multiple limit operations can be completed without changing the size of the actuator. Compared with the traditional use of air source to maintain the opening and closing angles of the actuator external parts, the present application can abandon the input of the air source after the adjustment is completed, which is more cost-effective and has a better limiting effect. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0063] Figure 2 It is a schematic diagram of the structure of the actuator of the present invention.

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

[0065] Figure 4 It is a schematic diagram of the structure of the execution unit of the present invention.

[0066] Figure 5 It is a schematic structural diagram of the first limiting portion of the present invention.

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

[0068] Figure 7 It is a schematic diagram of the structure of the regulating end spine group and the output end spine group of the present invention.

[0069] Figure 8 It is a schematic structural diagram of the second limiting portion of the present invention.

[0070] The accompanying drawings are marked as follows:

[0071] 1. Shell; 11. Ring shell; 111. End airway; 112. Middle airway; 12. End shell;

[0072] 2. Gas circuit connectors;

[0073] 3. Executive body;

[0074] 31. first limiting portion; 311. first limiting ring frame; 312. first limiting block; 313. first limiting column; 314. first limiting rack; 315. first limiting gear;

[0075] 316, adjusting end ratchet group; 3161, adjusting end ratchet; 3162, adjusting end abutment block;

[0076] 317, output end ratchet group; 3171, output end ratchet; 3172, output end stop block;

[0077] 32. Actuator; 321. Actuator shaft; 3211. Shaft gear; 322. Actuator external parts; 323. Linkage block; 3231. Linkage gear ring; 3232. Piston groove; 324. Pneumatic piston;

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

[0079] 34. Transmission part; 341. Transmission shaft; 342. Transmission belt at adjustment end; 343. Transmission gear at adjustment end; 344. Transmission gear shaft at adjustment end; 345. Ratchet shaft at adjustment end; 346. Transmission belt at output end; 347. Ratchet shaft at output end; 348. Ratchet shaft transmission gear;

[0080] 35. Adjustment part; 351. Adjustment sleeve; 352. Adjustment tooth groove; 353. Adjustment gear; 354. Adjustment sleeve shaft; 355. Adjustment step shaft; 356. Adjustment tooth. DETAILED DESCRIPTION

[0081] The present application relates to a multi-stage limit pneumatic actuator and a limit execution method thereof, which are explained in detail through specific implementation methods below.

[0082] A multi-stage limit pneumatic actuator, comprising:

[0083] A housing 1, a gas path connector 2 arranged on the housing 1, and an actuator 3 installed in the housing 1;

[0084] The actuator 3 includes an actuator part 32 disposed 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;

[0085] The housing 1 further includes 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 .

[0086] The present invention completes the limiting of the first direction and the second direction of the execution shaft 321 by designing the first limiting part 31 and the second limiting part 33, and designs the transmission part 34 at the same time, so that when the same adjustment part 35 is in different positions, the limiting strokes of the first limiting part and the second limiting part can be adjusted respectively, and multiple limiting operations can be completed without changing the size of the execution device. Compared with the traditional use of air source to maintain the opening and closing angle of the execution external component 322, the present application can abandon the input of air source after the adjustment is completed, which is more cost-effective and has a better limiting effect.

[0087] The housing 1 comprises:

[0088] 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 connected to the air passage connector 2, wherein the end air passage 111 extends to both ends of the annular shell 11, and the middle air passage 112 extends to the middle position of the annular shell 11;

[0089] The ring housing 11 is provided with a scale;

[0090] Notches adapted to the external actuator 322 and the adjusting sleeve 351 are provided on both sides of the annular shell 11 . The adjusting gear 353 of the adjusting sleeve 351 is located inside the annular shell 11 , and the adjusting sleeve 351 is located outside the annular shell 11 .

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

[0092] The end shell 12 is installed at both ends of the annular shell 11 . An air groove connected to the end air channel 111 is opened in the end shell 12 . The gas in the end air channel 111 is discharged into between the pneumatic piston 324 and the end to complete the movement of the pneumatic piston 324 .

[0093] The execution unit 32 includes:

[0094] An actuator shaft 321 is disposed in the annular housing 11. An actuator external connection member 322 is disposed at the end of the actuator shaft 321. A shaft tooth 3211 is disposed on the actuator shaft 321.

[0095] 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. Eccentric piston grooves 3232 are formed at both ends of the linkage block 323.

[0096] By means of the eccentrically designed piston groove 3232, different torques can be corresponded according to the different angles of the external component 322, so that the opening and closing effect is better.

[0097] The pneumatic pistons 324 are designed in two groups, which are centrally symmetrical. The ends of the pneumatic pistons 324 are provided with piston rods adapted to the piston grooves 3232 .

[0098] The adjustment unit 35 includes:

[0099] The adjusting sleeve shaft 354 is sleeved on the end of the executing shaft 321 away from the executing external component 322. The end of the adjusting sleeve shaft 354 is provided with an adjusting step shaft 355. The adjusting step shaft 355 is provided with adjusting teeth 356 of a predetermined size on the circumference. The length of the adjusting teeth 356 is shorter than the length of the adjusting 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. The adjusting sleeve 351 is provided with an adjusting tooth groove 352 adapted to the adjusting tooth 356. The end of the adjusting sleeve 351 is provided with an adjusting gear 353. The adjusting sleeve 351 is provided with an indicator. By pre-calculation, the angle indication on the scale is consistent with the output rotation angle of the actuator external component 322.

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

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

[0103] By designing the adjustment portion 35, the same adjustment sleeve 351 can be used to adjust the output end spike group 317, the adjustment end spike group 316 and the first limit portion 31, so that the entire actuator is more integrated.

[0104] The first limiting portion 31 includes:

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

[0106] The primary limiting member is designed in two groups and symmetrically arranged in the ring shell 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 secondary limiting member includes an adjusting end ratchet group 316 sleeved on the adjusting sleeve shaft 354 and an output end ratchet group 317 sleeved on the execution shaft 321;

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

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

[0110] By designing the first limit part 31 to cooperate with the adjustment end ratchet group 316, the first direction limit of the actuator 32 is completed, which avoids the actuator 32 from moving too long during the execution process, causing the actuator external component 322 to rotate too much, resulting in the valve opening and closing degree not reaching the expected angle.

[0111] The adjusting end ratchet assembly 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 abutting against the adjusting end ratchet wheel 3161;

[0112] The output end ratchet assembly 317 includes 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;

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

[0114] By designing two spike groups in opposite directions, the rotation angle of the external actuator 322 is limited. The adjusting end spike group 316 cooperates with the first limiting part 31 when working to limit the first direction of the actuator 32, and the output end spike group 317 directly acts on the actuator shaft 321 of the actuator 32.

[0115] The adjusting end spike 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 execution shaft 321 when adjusting the stroke, thereby avoiding the problem of mutual interference.

[0116] The second limiting portion 33 includes:

[0117] The second limit block 332 is sleeved on the execution shaft 321 and is in a diamond shape;

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

[0119] By designing the second limiting portion 33, the work of the executing portion 32 is completed again, and the rotation angle of the executing external component 322 is limited again. Through the first direction, the second direction and the second limiting, the executing shaft 321 can be fixed at an angle. Compared with the traditional method of using the continuous output of the air source, it is more stable and more cost-effective.

[0120] The transmission part 34 includes:

[0121] The adjusting end transmission gear shaft 344 is arranged in the annular shell 11, close to the side of the adjusting sleeve 351, and the adjusting end transmission gear shaft 344 is sleeved with an adjusting end transmission gear 343;

[0122] The adjusting end ratchet shaft 345 is arranged in the annular housing 11, close to the adjusting sleeve 351, and the adjusting end ratchet shaft 345 is sleeved with a ratchet shaft transmission gear 348;

[0123] The output end ratchet shaft 347 is arranged in the annular housing 11, away from the side of the adjustment sleeve 351;

[0124] The transmission shaft 341 is arranged in the annular shell 11. The two ends of the transmission shaft 341 are respectively provided with an adjustment end transmission belt 342 and an output end transmission belt 346 which are transmission-connected to the adjustment end transmission gear shaft 344 and the adjustment 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 plugged into the annular shell 11 , and a predetermined damping force is designed when they are assembled with the annular shell 11 .

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

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

[0128] The output end abutment 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 pneumatic limit execution method, comprising:

[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, so that the adjusting tooth groove 352 is engaged with the adjusting tooth teeth 356, rotate the adjusting sleeve 351, drive the adjusting 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;

[0132] Step 2: limit the actuator 32 in the first direction, adjust the position of the adjusting sleeve 351 on the adjusting sleeve shaft 354, separate the adjusting tooth groove 352 from the adjusting tooth teeth 356, and mesh the adjusting gear 353 with the ratchet shaft transmission gear 348, rotate the adjusting sleeve 351, drive the ratchet shaft transmission gear 348 to rotate, drive the adjusting end ratchet shaft 345 to rotate, drive the adjusting end abutment block 3162 to move, and make the adjusting end abutment block 3162 abut against the adjusting end ratchet wheel 3161, when the actuator 32 abuts against the first limiting column 313, the first direction limit is completed;

[0133] Step 3, the actuator 32 works, driving the external actuator 322 to select a predetermined angle, injecting gas into the gas path connector 2 through an external gas source, and the gas enters the two ends of the pneumatic piston 324 through the end gas channel 111, so that the two pneumatic pistons 324 move close to each other, 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 external actuator 322 to select a predetermined angle;

[0134] The external executing component 322 is externally connected to the valve, and the valve is opened and closed by rotating the external executing component 322. A slot is provided inside the external executing component 322, and the slot is adapted to connect with the valve stem or valve core of the valve to complete the opening and closing work.

[0135] 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 the output end ratchet 3171, and complete the second direction limit of the actuator 32;

[0136] Step 5, limit the actuator 32 again. When the actuator 32 is limited in the first direction and the second direction, rotate the limiting bolt 331 to make the limiting bolt 331 abut against the second limiting block 332 to complete the limiting work of the actuator 32 again. After limiting, in the absence of an air source, maintain the angle of the actuator external component 322.

[0137] Working principle description:

[0138] The execution stroke of the adjusting actuator 32 is adjusted. When adjusting, the position of the adjusting sleeve 351 on the adjusting sleeve shaft 354 is adjusted so that the adjusting tooth groove 352 is meshed with the adjusting tooth teeth 356. The adjusting sleeve 351 is rotated 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.

[0139] To limit the actuator 32 in the first direction, adjust the position of the adjusting sleeve 351 on the adjusting sleeve shaft 354, so that the adjusting tooth groove 352 is separated from the adjusting tooth teeth 356, and the adjusting gear 353 is meshed with the ratchet shaft transmission gear 348, and the adjusting sleeve 351 is rotated to drive the ratchet shaft transmission gear 348 to rotate, drive the adjusting end ratchet shaft 345 to rotate, drive the adjusting end abutment block 3162 to move, so that the adjusting end abutment block 3162 abuts 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;

[0140] The actuator 32 works, driving the external actuator 322 to select a predetermined angle, injecting gas into the gas circuit connector 2 through an external gas source, and the gas enters the two ends of the pneumatic piston 324 through the end gas channel 111, so that the two pneumatic pistons 324 move close to each other, 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 external actuator 322 to select a predetermined angle;

[0141] The external executing component 322 is externally connected to the valve, and the valve is opened and closed by rotating the external executing component 322. A slot is provided inside the external executing component 322, and the slot is adapted to connect with the valve stem or valve core of the valve to complete the opening and closing work.

[0142] To limit the actuator 32 in the second direction, adjust the position of the adjusting sleeve 351 on the adjusting sleeve shaft 354, so that the adjusting gear 353 is meshed with the adjusting end transmission gear 343, and the adjusting sleeve 351 is rotated to 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;

[0143] The actuator 32 is limited again. When the actuator 32 is limited in the first direction and the second direction, the limiting bolt 331 is rotated to make the limiting bolt 331 abut against the second limiting block 332 to complete the limiting work of the actuator 32 again. After limiting, in the absence of an air source, the angle of the actuator external component 322 is maintained.

[0144] The preferred embodiments of the present invention are described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, various equivalent transformations can be made to the technical scheme 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); The actuator (3) is characterized in that it comprises an actuator (32) arranged in the housing (1), and a first limiting portion (31) and a second limiting portion (33) for limiting the movement range of the actuator (32); The housing (1) is also 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).

2. A multi-stage limit pneumatic actuator according to claim 1, characterized in that: 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 piece (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 end shells (12) are installed at both ends of the annular shell (11).

3. A multi-stage limit pneumatic actuator according to claim 1, characterized in that: The execution unit (32) comprises: An actuator shaft (321) is arranged in the annular housing (11); an actuator external connection piece (322) is arranged at the end of the actuator shaft (321); and shaft teeth (3211) are arranged 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).

4. The multi-stage limit pneumatic actuator according to claim 1, characterized in that: The adjusting unit (35) comprises: An adjusting sleeve shaft (354) is sleeved on one end of the actuating shaft (321) away from the actuating external connecting member (322), an adjusting step shaft (355) is provided at the end of the adjusting sleeve shaft (354), and adjusting teeth (356) of a predetermined size are provided on the circumference of the adjusting step shaft (355); An 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 provided in the adjusting sleeve (351). An adjusting gear (353) is provided at the end of the adjusting sleeve (351).

5. The multi-stage limit pneumatic actuator according to claim 1 is characterized in that: The first limiting portion (31) comprises: A first limiting gear (315) is sleeved on the adjusting sleeve shaft (354); The primary limiting member is designed in two groups and 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 ratchet group (316) sleeved on the adjusting sleeve shaft (354), and an output end ratchet group (317) sleeved on the execution shaft (321); 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; The first limiting column (313) abuts against the end of the pneumatic piston (324).

6. A multi-stage limit pneumatic actuator according to claim 5, characterized in that: 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 limiting gear (315), and an adjusting end abutting block (3162) abutting against the adjusting end ratchet (3161); The output end ratchet group (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.

7. The multi-stage limit pneumatic actuator according to claim 1 is 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, which are respectively screwed to the ring shell (11) and are located at the upper and lower ends of the second limiting block (332).

8. The multi-stage limit pneumatic actuator according to claim 1, characterized in that: 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 away from a side of the adjustment sleeve (351); A transmission shaft (341) is arranged in the annular housing (11), and an adjustment end transmission belt (342) and an output end transmission belt (346) are respectively provided at two ends of the transmission shaft (341) and are transmission-connected to the adjustment end transmission gear shaft (344) and the adjustment end ratchet shaft (345).

9. A multi-stage limit pneumatic actuator according to claim 8, characterized in that: 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).

10. A pneumatic limit actuator method, implemented based on a multi-stage pneumatic limit actuator device according to any one of claims 1 to 9, 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 (356), rotate the adjustment sleeve (351), 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: limit the actuator (32) in the first direction by adjusting the position of the adjusting sleeve (351) on the adjusting sleeve shaft (354) so ​​that the adjusting tooth groove (352) is separated from the adjusting tooth teeth (356), and the adjusting gear (353) is meshed with the ratchet shaft transmission gear (348), and the adjusting sleeve (351) is rotated to drive the ratchet shaft transmission gear (348) to rotate, drive the adjusting end ratchet shaft (345) to rotate, drive the adjusting end abutment block (3162) to move, and make the adjusting end abutment block (3162) abut against the adjusting end ratchet wheel (3161), and when the actuator (32) abuts against the first limiting column (313), the first direction limit is completed; Step 3, the execution part (32) works, driving the execution external component (322) to select a predetermined angle, injecting gas into the gas path connection component (2) through an external gas source, and the gas enters the two ends of the pneumatic piston (324) through the end gas channel (111), so that the two pneumatic pistons (324) move closer to each other, thereby driving the linkage block (323) to swing, driving the execution shaft (321) to rotate, until the pneumatic piston (324) abuts against the first limit column (313), driving the execution 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, limit the actuator (32) again. When the actuator (32) is limited in the first direction and the second direction, rotate the limit bolt (331) so that the limit bolt (331) abuts against the second limit block (332), completing the re-limiting work of the actuator (32). After limiting, in the absence of an air source, maintain the angle of the actuator external component (322).

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