CN204554006U - There is the Quick-type angle stroke pneumatic final controlling element of pooling feature - Google Patents
There is the Quick-type angle stroke pneumatic final controlling element of pooling feature Download PDFInfo
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- CN204554006U CN204554006U CN201520188110.5U CN201520188110U CN204554006U CN 204554006 U CN204554006 U CN 204554006U CN 201520188110 U CN201520188110 U CN 201520188110U CN 204554006 U CN204554006 U CN 204554006U
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Abstract
The utility model discloses a kind of Quick-type angle stroke pneumatic final controlling element with pooling feature, two pistons in left and right are provided with in cylinder block, elastic device is provided with between described piston and the end cap of homonymy, the piston arm that described piston comprises piston plectane and is connected with periphery, piston plectane side one, left and right two pistons piston arm on be all fixed with hydraulic buffer, on described hydraulic buffer by raming end between the piston arm free end and the piston plectane of opposite side piston of side piston.Problem that is serious, that affect pneumatic actuator and valve working life and reliability is impacted when it efficiently solves the Quick-type angle stroke pneumatic final controlling element switch of prior art, pneumatic actuator good buffer effect of the present utility model, the working life of relevant device can be improved, there is very high use value.
Description
Technical field
The utility model relates to pneumatic actuator technical field, particularly a kind of Quick-type angle stroke pneumatic final controlling element with pooling feature.
Background technique
In many industrial automatic control processes, require that valve can respond fast, realize quick closedown or open fast, realize carrying out effectively controlling fast to controlled medium, thus meet the requirement of special operation condition.Quick-type pneumatic actuator, owing to taking effective speedup measure, makes pneumatic actuator drive the speed of valve also to accelerate thereupon, just can realize closedown or the unlatching of valve in 1 ~ 2 second.But because the speed of closing or open is very fast, causes pneumatic actuator and valve at off-position or open position, impacting serious, directly affect working life and the reliability of pneumatic actuator and valve.Therefore, design a kind of Quick-type pneumatic actuator with pooling feature, just very necessary.Publication date is on April 20th, 2011, and publication number is that the Chinese patent document of CN 201802383 U discloses a kind of Pneumatic rotating actuator with adjustable angle, comprising: cylinder, is provided with piston in described cylinder; Gear transmission structure, described gear transmission structure comprises pitch wheel and tooth bar, and described tooth bar connects described piston, and described gear axis connects final controlling element; Angle demodulator. described angle demodulator is connected with described piston and arranges, and limits described piston mobile position.This structure adopts cylinder as power source, and gear transmission structure, as actuator, can accurately control final controlling element action.This structure adopts the action of angle demodulator control gear drive mechanism, and position is reliable, can realize automation mechanized operation, while avoiding artificial incorrect operation, improve working efficiency.Publication date is on October 6th, 2004, publication number is that the patent document of CN2646452Y discloses a kind of smart small-sized pneumatic rotary actuator, comprise cylinder, cylinder head, there is piston at two ends in cylinder, two pistons are connected with piston arm, piston arm there is tooth bar, two tooth bars are meshed with the moment of torsion output gear in the middle of piston, cylinder wall there is gas inlet/outlet pipe, countercylinder is had between the two ends and the cylinder head at two ends of cylinder, cylinder separator disk is had to be isolated respectively between cylinder and two countercylinders, respectively sub-piston is had in two countercylinders, two sub-pistons are connected with close piston by piston rod respectively, gas inlet/outlet pipe is communicated with the cylinder of the both ends of the surface of piston and sub-piston respectively, in countercylinder, at the intermediate finite position screw of two cylinder head.But said structure all unresolved Quick-type angle stroke pneumatic final controlling element is opened or closing velocity is very fast, cause pneumatic actuator and valve to impact in switch bit serious, directly affect the problem of pneumatic actuator and valve working life and reliability.
Model utility content
Impact problem that is serious, that affect pneumatic actuator and valve working life and reliability when the purpose of this utility model is the Quick-type angle stroke pneumatic final controlling element switch for solving prior art, a kind of Quick-type angle stroke pneumatic final controlling element with switch pooling feature is provided.
The utility model for solving the problems of the technologies described above adopted technological scheme is: a kind of Quick-type angle stroke pneumatic final controlling element with pooling feature, comprise cylinder block and be arranged on the end cap at cylinder block two ends, cylinder block is provided with some gas ports, two pistons in left and right are provided with in cylinder block, elastic device is provided with between described piston and the end cap of homonymy, the piston arm that described piston comprises piston plectane and is connected with periphery, piston plectane side one, side near cylinder block axle center on piston arm is provided with tooth bar, its flank of tooth of tooth bar on two pistons in left and right relatively and all engage with output gear axle, the piston arm of two pistons in left and right is all fixed with hydraulic buffer, on described hydraulic buffer by raming end between the piston arm free end and the piston plectane of opposite side piston of side piston.The utility model sets up hydraulic buffer to reduce impact in pneumatic actuator, the technological scheme taked is, the piston arm of stroke pneumatic final controlling element inside, Quick-type angle installs hydraulic buffer, the head of being ramed of hydraulic buffer stretches out piston arm end face about 5 ~ 15mm, when the piston of fast moving is closer to each other, first contact be hydraulic buffer by raming and a side plane of opposing side piston, due to the protecting against shock pooling feature of hydraulic buffer, thus the buffer protection realized pneumatic actuator and valve, pneumatic actuator is made both to meet the requirement opened or closed fast, be unlikely to again to damage the spacing regulating mechanism of pneumatic actuator and the sealing pair of valve, improve reliability and the working life of product to greatest extent.Like this, problem that is serious, that affect pneumatic actuator and valve working life and reliability is impacted when the utility model solves the Quick-type angle stroke pneumatic final controlling element switch of prior art.
As preferably, output gear axle is provided with limit cam, limit cam is provided with two spacing block sets, and cylinder block is provided with the standard-sized sheet position adjusting bolt corresponding with two spacing block sets and complete shut-down position adjusting bolt, and standard-sized sheet position adjusting bolt and complete shut-down position adjusting bolt are equipped with locking nut.By regulating the built-in length of standard-sized sheet position adjusting bolt or complete shut-down position adjusting bolt, standard-sized sheet position adjusting bolt or complete shut-down position adjusting bolt and corresponding spacing block set are conflicted, the rotation angle of output gear axle can be limited, thus realize control the fine setting of valve near standard-sized sheet position or complete shut-down position, with the needs of satisfied different operating mode.Structure of the present utility model can realize the fine setting of ± 6 degree in the position of valve opening angle 0 degree and 90 degree, can meet the control overflow of most of valve.Locking nut after standard-sized sheet position adjusting bolt and complete shut-down position adjusting bolt are adjusted to the right place for the position of fixing standard-sized sheet position adjusting bolt and complete shut-down position adjusting bolt.
As preferably, described gas port is three, comprises the limit gas port that a middle gas port being arranged on the middle part of cylinder block and two are separately positioned on the two end part of cylinder block.
As preferably, piston arm is provided with the floor parallel with piston movement direction near cylinder block inwall side, diaphragm is provided with between floor, diaphragm is provided with axial hole, described hydraulic buffer is arranged in through hole, the outer wall of hydraulic buffer is provided with screw thread, and hydraulic buffer is fixed on diaphragm by set screw nut.Floor place on these piston arms arranges diaphragm that is vertical with floor length direction and that be mutually integrally connected by these floors, and diaphragm between floor arranges axial hole for fixing hydraulic buffer, the space between floor can be made full use of like this.
As preferably, elastic device is adjustable preload spring assembly, comprise Compress Spring and the pre-tightening mechanism for applying preload to Compress Spring, two that are oppositely arranged bottom described pre-tightening mechanism comprises spring guide pillars cylindrically, at the bottom of the cylinder of cylinder, central authorities are provided with through hole, the sliding guide that one end has baffle plate is equipped with respectively in through hole, tapped hole is provided with in sliding guide, be connected by adjustment screw rod between two sliding guides, the cylinder-like structure opening of spring guide pillar is provided with flanging, the two ends of described Compress Spring are connected between the flanging of two spring guide pillars, spacing between two spring guide pillar flangings is less than the free length of Compress Spring, the two ends of described adjustment screw rod are respectively left handed screw and right handed screw, the tapped hole in two sliding guides respectively with left handed screw and right handed screw suitable, tapped hole and adjustment screw rod between be provided with lock screw.The cascaded structure of spring guide pillar and sliding guide limits the free length of Compress Spring, make the overall length of spring when assembling shorter, be conducive to the assembling of spring, and when spring normally works by compression, sliding guide can put in spring guide pillar with an end of rib, therefore can not have an impact to the normal work of spring; And when the working pressure on spring disappears, adjustment screw rod has held the spring guide pillar at two by the rib on sliding guide, between the flanging length of Compress Spring being limited in two spring guide pillars.Due to be limited the Compress Spring after length be only longer than slightly spring in working order under length, when plant maintenance is taken apart, the component decisive range of spring to this equipment of compressive state is very short, therefore these component can not be ejected under the elastic force effect of spring, it is hereby ensured safety.
As preferably, hydraulic buffer comprises outer cylinder body and is located at the axle sleeve in outer cylinder body, the front end of axle sleeve and outer cylinder body seal, the rear end of axle sleeve is connected with inner cylinder body, be provided with the mandrel that can move axially along axle sleeve in axle sleeve, be provided with sliding plug in inner cylinder body, one end of mandrel is connected with sliding plug, the other end of mandrel passes axle sleeve and stretches out outer cylinder body, and its end arranges described being ramed; The rear end of inner cylinder body is communicated with outer cylinder body by check valve, and be provided with to slide between sliding plug and check valve in inner cylinder body and fill in Returnning spring, the casing wall of inner cylinder body is provided with oil drainage hole, is provided with pressure accumulation sponge between the periphery of axle sleeve and the casing wall of outer cylinder body.On the utility model hydraulic buffer by raming end between the piston arm free end and the piston plectane of opposite side piston of side piston, when piston movement collide ramed end time, the sliding plug in inner cylinder body is to check valve one lateral movement.Because the oil drainage hole on inner cylinder body casing wall has throttling action, oil in inner casing body cavity can not flow out in time, external impacts makes the oil pressure of inner casing body cavity sharply rise, because check valve is closed, high pressure oil can only, from oil drainage hole ejection at a high speed, make most of surge pressure change into heat energy, and by outer cylinder body loss in air, thus play the effect of damper piston elliptical gear power, before the sliding plug of hydraulic buffer is moved to stroke terminal, impact energy is all sponged.When the impact force by side of raming disappears, during piston reverses direction motion, under the effect of Returnning spring, sliding plug is oppositely mobile, and check valve is opened, and the oil flowed out from oil drainage hole is back to inner casing body cavity.Here pressure accumulation sponge is for storing the unnecessary fluid of discharging from inner casing body cavity, when there is sufficient space between the piston arm free end and the piston plectane of opposite side piston of side piston, while the oil pressure of inner casing body cavity and the elastic force of Returnning spring make piston rod stretch out, negative pressure is produced in outer shell body cavity, oil in pressure accumulation sponge is just back to inner casing body cavity, make sliding plug be reset to end, such hydraulic buffer can be just cushion ready next time.
As preferably, between mandrel and axle sleeve, be provided with stuffing box gland, on being ramed, be arranged with noise reduction cover.Stuffing box gland is used for dust-proof and sealing, and noise reduction cover can reduce impact noise, has buffer function simultaneously, can the operating life of extension device.
The beneficial effects of the utility model are: impact problem that is serious, that affect pneumatic actuator and valve working life and reliability when it efficiently solves the Quick-type angle stroke pneumatic final controlling element switch of prior art, pneumatic actuator good buffer effect of the present utility model, the working life of relevant device can be improved, there is very high use value.
Accompanying drawing explanation
Fig. 1 is a kind of structure sectional view of the present utility model;
Fig. 2 is a kind of partial structurtes schematic diagram of the present utility model;
Fig. 3 is a kind of structural representation of the utility model hydraulic buffer;
Fig. 4 is a kind of structural representation of the utility model elastic device.
In figure: 1. sliding guide, 2. cylinder block, 3. piston arm, 4. hydraulic buffer, 5. piston plectane, 6. Compress Spring, 7. spring guide pillar, 8. end cap, 9. spacing block set, 10. output gear axle, 11. complete shut-down position adjusting bolts, 12. middle gas ports, 13. standard-sized sheet position adjusting bolts, 14. tooth bars, 15. limit gas ports, 16. set screw nuts, 17. mandrels, 18. are ramed, 19. noise reduction covers, 20. outer cylinder bodies, 21. oil drainage holes, 22. sliding plug Returnning springs, 23. pressure accumulation sponges, 24. stuffing box glands, 25. check valves, 26. inner cylinder bodies, 27. sliding plugs, 28. axle sleeves, 29. baffle plates, 30. tapped holes, 31. adjustment screw rods, 32. flangings, 33. left handed screws, 34. right handed screw, 35. lock screws, 36. floors, 37. diaphragms.
Embodiment
Below by embodiment, and by reference to the accompanying drawings the embodiment of technical solutions of the utility model is further described.
Embodiment 1
In the embodiment 1 such as shown in Fig. 1 Fig. 2, a kind of Quick-type angle stroke pneumatic final controlling element with pooling feature, comprise cylinder block 2 and be arranged on the end cap 8 at cylinder block two ends, cylinder block is provided with three gas ports, comprise in limit gas port 15 cylinder block that a middle gas port 12 being arranged on the middle part of cylinder block and two are separately positioned on the two end part of cylinder block and be provided with two pistons in left and right, be provided with elastic device between described piston and the end cap of homonymy, elastic device is preload spring, the piston arm 3 that described piston comprises piston plectane 5 and is connected with periphery, piston plectane side one, the piston arm of two pistons in left and right is all fixed with hydraulic buffer 4, piston arm is provided with the floor 36 parallel with piston movement direction near cylinder block inwall side, diaphragm 37 is provided with between floor, diaphragm is provided with axial hole, described hydraulic buffer is arranged in through hole, the outer wall of hydraulic buffer is provided with screw thread, hydraulic buffer is fixed on diaphragm by set screw nut 16, on described hydraulic buffer by raming 18 ends between the piston arm free end and the piston plectane of opposite side piston of side piston.Side near cylinder block axle center on piston arm is provided with tooth bar 14, its flank of tooth of tooth bar on two pistons in left and right relatively and all engage with output gear axle 10, described output gear axle is provided with limit cam, limit cam is provided with two spacing block sets 9, cylinder block is provided with the standard-sized sheet position adjusting bolt 13 corresponding with two spacing block sets and complete shut-down position adjusting bolt 11, and standard-sized sheet position adjusting bolt and complete shut-down position adjusting bolt are equipped with locking nut.
Embodiment 2
The elastic device of embodiment 2 is adjustable preload spring assembly (see figure 4), comprise Compress Spring 6 and the pre-tightening mechanism for applying preload to Compress Spring, two that are oppositely arranged bottom described pre-tightening mechanism comprises spring guide pillars 7 cylindrically, at the bottom of the cylinder of cylinder, central authorities are provided with through hole, the sliding guide 1 that one end has baffle plate 29 is equipped with respectively in through hole, tapped hole 30 is provided with in sliding guide, be connected by adjustment screw rod 31 between two sliding guides, the cylinder-like structure opening of spring guide pillar is provided with flanging 32, the two ends of described Compress Spring are connected between the flanging of two spring guide pillars, spacing between two spring guide pillar flangings is less than the free length of Compress Spring, the two ends of described adjustment screw rod be respectively left handed screw 33 and the tapped hole in right handed screw 34, two sliding guides respectively with left handed screw and right handed screw suitable, be provided with lock screw 35 between tapped hole and adjustment screw rod, all the other are identical with embodiment 1.
Embodiment 3
The hydraulic buffer (see figure 3) of embodiment 3 comprises outer cylinder body 20 and is located at the axle sleeve 28 in outer cylinder body, the front end of axle sleeve and outer cylinder body seal, the rear end of axle sleeve is connected with inner cylinder body 26, the mandrel 17 that can move axially along axle sleeve is provided with in axle sleeve, sliding plug 27 is provided with in inner cylinder body, one end of mandrel is connected with sliding plug, and the other end of mandrel passes axle sleeve and stretches out outer cylinder body, and its end arranges described being ramed; The rear end of inner cylinder body is communicated with outer cylinder body by check valve 25, be provided with to slide between sliding plug and check valve in inner cylinder body and fill in Returnning spring 22, the casing wall of inner cylinder body is provided with oil drainage hole 21, pressure accumulation sponge 23 is provided with between the periphery of axle sleeve and the casing wall of outer cylinder body, stuffing box gland 24 is provided with between described mandrel and axle sleeve, be arranged with noise reduction cover 19 on being ramed, all the other are identical with embodiment 1 or embodiment 2.
The utility model installs hydraulic buffer on the piston arm of stroke pneumatic final controlling element inside, Quick-type angle, the head of being ramed of hydraulic buffer stretches out piston arm end face about 5 ~ 15mm, when the piston of fast moving is closer to each other, first contact be hydraulic buffer by raming and a side plane of opposing side piston, due to the protecting against shock pooling feature of hydraulic buffer, thus the buffer protection realized pneumatic actuator and valve, pneumatic actuator is made both to meet the requirement opened or closed fast, be unlikely to again to damage the spacing regulating mechanism of pneumatic actuator and the sealing pair of valve, improve reliability and the working life of product to greatest extent.
In addition to the implementation; in the scope disclosed in claims of the present utility model and specification; technical characteristics of the present utility model or technical data can carry out reselecting and combining; thus forming new embodiment, the embodiment that these the utility model are not described in detail also should be considered as specific embodiment of the utility model and within protection domain of the present utility model.
Claims (7)
1. one kind has the Quick-type angle stroke pneumatic final controlling element of pooling feature, comprise cylinder block (2) and be arranged on the end cap (8) at cylinder block two ends, cylinder block is provided with some gas ports, two pistons in left and right are provided with in cylinder block, elastic device is provided with between described piston and the end cap of homonymy, it is characterized in that, the piston arm (3) that described piston comprises piston plectane (5) and is connected with periphery, piston plectane side one, side near cylinder block axle center on piston arm is provided with tooth bar (14), its flank of tooth of tooth bar on two pistons in left and right relatively and all engage with output gear axle (10), the piston arm of two pistons in left and right is all fixed with hydraulic buffer (4), described hydraulic buffer ramed (18) end between the piston arm free end and the piston plectane of opposite side piston of side piston.
2. the Quick-type angle stroke pneumatic final controlling element with pooling feature according to claim 1, it is characterized in that: described output gear axle is provided with limit cam, limit cam is provided with two spacing block sets (9), cylinder block is provided with standard-sized sheet position adjusting bolt (13) corresponding with two spacing block sets and complete shut-down position adjusting bolt (11), and standard-sized sheet position adjusting bolt and complete shut-down position adjusting bolt are equipped with locking nut.
3. the Quick-type angle stroke pneumatic final controlling element with pooling feature according to claim 1, it is characterized in that: described gas port is three, comprise the limit gas port (15) that a middle gas port (12) being arranged on the middle part of cylinder block and two are separately positioned on the two end part of cylinder block.
4. the Quick-type angle stroke pneumatic final controlling element with pooling feature according to claim 1, it is characterized in that: described piston arm is provided with the floor (36) parallel with piston movement direction near cylinder block inwall side, diaphragm (37) is provided with between floor, diaphragm is provided with axial hole, described hydraulic buffer is arranged in through hole, the outer wall of hydraulic buffer is provided with screw thread, and hydraulic buffer is fixed on diaphragm by set screw nut (16).
5. there is the Quick-type angle stroke pneumatic final controlling element of pooling feature according to claim 1, it is characterized in that: described elastic device is adjustable preload spring assembly, comprise Compress Spring (6) and the pre-tightening mechanism for applying preload to Compress Spring, two that are oppositely arranged bottom described pre-tightening mechanism comprises spring guide pillars (7) cylindrically, at the bottom of the cylinder of cylinder, central authorities are provided with through hole, the sliding guide (1) that one end has baffle plate (29) is equipped with respectively in through hole, tapped hole (30) is provided with in sliding guide, be connected by adjustment screw rod (31) between two sliding guides, the cylinder-like structure opening of spring guide pillar is provided with flanging (32), the two ends of described Compress Spring are connected between the flanging of two spring guide pillars, spacing between two spring guide pillar flangings is less than the free length of Compress Spring, the two ends of described adjustment screw rod are respectively left handed screw (33) and right handed screw (34), the tapped hole in two sliding guides respectively with left handed screw and right handed screw suitable, be provided with lock screw (35) between tapped hole and adjustment screw rod.
6. the Quick-type angle stroke pneumatic final controlling element with pooling feature according to any one of claim 1-5, it is characterized in that: hydraulic buffer comprises outer cylinder body (20) and is located at the axle sleeve (28) in outer cylinder body, the front end of axle sleeve and outer cylinder body seal, the rear end of axle sleeve is connected with inner cylinder body (26), the mandrel (17) that can move axially along axle sleeve is provided with in axle sleeve, sliding plug (27) is provided with in inner cylinder body, one end of mandrel is connected with sliding plug, the other end of mandrel passes axle sleeve and stretches out outer cylinder body, and its end arranges described being ramed; The rear end of inner cylinder body is communicated with outer cylinder body by check valve (25), be provided with to slide between sliding plug and check valve in inner cylinder body and fill in Returnning spring (22), the casing wall of inner cylinder body is provided with oil drainage hole (21), is provided with pressure accumulation sponge (23) between the periphery of axle sleeve and the casing wall of outer cylinder body.
7. the Quick-type angle stroke pneumatic final controlling element with pooling feature according to claim 6, is characterized in that: be provided with stuffing box gland (24) between described mandrel and axle sleeve, is arranged with noise reduction cover (19) on being ramed.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106051280A (en) * | 2016-08-02 | 2016-10-26 | 成都兹维克阀门有限公司 | Pneumatic actuator with pneumatic cushioning function |
| CN107768877A (en) * | 2017-11-20 | 2018-03-06 | 镇江华京通讯科技有限公司 | A kind of attachment means of radio frequency (RF) coaxial connector |
| CN108561484A (en) * | 2018-03-14 | 2018-09-21 | 浙江耀欧汽车零部件有限公司 | One kind having the dust-proof motor-driven jack holder of buffer structure both legs support type |
| CN109114291A (en) * | 2017-06-23 | 2019-01-01 | 深圳市飞托克实业有限公司 | A kind of deep-sea hydraulic actuator |
| CN109357068A (en) * | 2018-11-30 | 2019-02-19 | 中国船舶重工集团公司第七〇九研究所 | Valve actuator and its application method |
| CN110296121A (en) * | 2019-08-06 | 2019-10-01 | 志泰阀门有限公司 | A kind of AT total travel adjusting actuator |
| CN113251168A (en) * | 2021-05-08 | 2021-08-13 | 超达阀门集团股份有限公司 | Fine actuator and valve |
| CN114294467A (en) * | 2021-12-30 | 2022-04-08 | 江苏汇朗机械科技有限公司 | Multipurpose adjustable pneumatic actuator and operation method thereof |
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2015
- 2015-03-31 CN CN201520188110.5U patent/CN204554006U/en active Active
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106051280A (en) * | 2016-08-02 | 2016-10-26 | 成都兹维克阀门有限公司 | Pneumatic actuator with pneumatic cushioning function |
| CN106051280B (en) * | 2016-08-02 | 2018-06-22 | 成都兹维克阀门有限公司 | Pressure buffer pneumatic actuator |
| CN109114291A (en) * | 2017-06-23 | 2019-01-01 | 深圳市飞托克实业有限公司 | A kind of deep-sea hydraulic actuator |
| CN107768877A (en) * | 2017-11-20 | 2018-03-06 | 镇江华京通讯科技有限公司 | A kind of attachment means of radio frequency (RF) coaxial connector |
| CN108561484A (en) * | 2018-03-14 | 2018-09-21 | 浙江耀欧汽车零部件有限公司 | One kind having the dust-proof motor-driven jack holder of buffer structure both legs support type |
| CN109357068A (en) * | 2018-11-30 | 2019-02-19 | 中国船舶重工集团公司第七〇九研究所 | Valve actuator and its application method |
| CN110296121A (en) * | 2019-08-06 | 2019-10-01 | 志泰阀门有限公司 | A kind of AT total travel adjusting actuator |
| CN113251168A (en) * | 2021-05-08 | 2021-08-13 | 超达阀门集团股份有限公司 | Fine actuator and valve |
| CN113251168B (en) * | 2021-05-08 | 2023-03-03 | 超达阀门集团股份有限公司 | Fine actuator and valve |
| CN114294467A (en) * | 2021-12-30 | 2022-04-08 | 江苏汇朗机械科技有限公司 | Multipurpose adjustable pneumatic actuator and operation method thereof |
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