CN210240167U

CN210240167U - Drive shaft guide mechanism for pneumatic actuator

Info

Publication number: CN210240167U
Application number: CN201921038905.2U
Authority: CN
Inventors: Chutian He; 何楚天; Chao Chen; 陈超; Bing Hu; 胡冰; Jun Chen; 陈君
Original assignee: Wuxi Aishengtuoke Fluid Control Co ltd
Current assignee: Wuxi Aishengtuoke Fluid Control Co ltd
Priority date: 2019-07-04
Filing date: 2019-07-04
Publication date: 2020-04-03
Anticipated expiration: 2029-07-04

Abstract

The utility model relates to a drive shaft guiding mechanism for pneumatic actuator belongs to guiding mechanism technical field. The cylinder comprises a cylinder body, a cylinder cover, a rack piston, a cam and a driving shaft; two ends of the cylinder body are provided with cylinder covers; a rack piston and a cam are arranged in the cylinder body, and the cam is connected with the driving shaft in a matching way; the device also comprises a driving shaft guide mechanism; the output end of the driving shaft is connected with the cylinder body in a matching way through a driving shaft guide mechanism. The utility model discloses the plastics guide ring has not only played the drive shaft in the cylinder body and has connected the guide effect, has still replaced the plastic pad that needs to use when original drive shaft assembly, and this kind of novel structure can the fit clearance of effective control drive shaft and cylinder body to reach the effect that further increases pneumatic actuator's action life-span.

Description

Drive shaft guide mechanism for pneumatic actuator

Technical Field

The utility model relates to a drive shaft guiding mechanism for pneumatic actuator, concretely relates to reduce drive shaft clearance of rotation and increase working life's novel guide structure belongs to guiding mechanism technical field.

Background

The actuating mechanism and the adjusting mechanism of the pneumatic actuator are a unified whole, and the actuating mechanism comprises a film type, a piston type, a shifting fork type and a gear-rack type. The piston type stroke is long, and the piston type thrust mechanism is suitable for occasions requiring large thrust; the diaphragm type stroke is small, and the valve rod can only be directly driven. The shifting fork type pneumatic actuator has the characteristics of large torque, small space, more accordance with a torque curve of a valve and the like, but is not very attractive; is often used on valves with high torque. The rack and pinion type pneumatic actuator has the advantages of simple structure, stable and reliable action, safety, explosion prevention and the like, and is widely applied to production processes with higher safety requirements, such as power plants, chemical engineering, oil refining and the like.

When the pneumatic actuator drive shaft rotated, in order to avoid drive shaft axis body (45 steel material) and cylinder body (aluminum alloy material) direct contact, thereby produced the excessive loss of two parts of intermetallic friction cause, lead to pneumatic actuator action life-span to seriously shorten, generally can install plastics guide ring (POM material) in the drive shaft, trun into intermetallic friction into metal and plastics friction to increase pneumatic actuator's action life-span.

Because the plastic guide ring is an injection molding product, the product size of the injection molding product cannot be accurately controlled like a machined part under the existing process condition, and the size of the injection molding product near an injection gate is particularly difficult to control due to the existence of the injection gate, so that after the plastic guide ring is adopted, the fit clearance between the driving shaft and the cylinder body cannot be effectively controlled, and the condition of overlarge fit clearance can often occur. If the fit clearance between the driving shaft and the cylinder body is too large, the pneumatic actuator starts to work at one moment, the place with the large driving axial clearance deflects, on one hand, a certain point of the plastic guide ring is subjected to excessive force friction, on the other hand, the sealing clearance of the sealing ring on the shaft is enlarged, and therefore air leakage of the contact part of the driving shaft and the cylinder body is caused, and if the air leakage of the pneumatic actuator occurs, the pneumatic actuator is represented to have sent a fault and needs to be maintained.

Disclosure of Invention

The utility model aims at overcoming above-mentioned weak point, providing a drive shaft guiding mechanism for pneumatic actuator, its fit clearance that can effective control drive shaft and cylinder body to reach the effect that further increases pneumatic actuator's action life-span.

The technical scheme of the utility model is that the driving shaft guide mechanism for the pneumatic actuator comprises a cylinder body, a cylinder cover, a rack piston, a cam and a driving shaft; two ends of the cylinder body are provided with cylinder covers; a rack piston and a cam are arranged in the cylinder body, and the cam is connected with the driving shaft in a matching way; the device also comprises a driving shaft guide mechanism; the output end of the driving shaft is connected with the cylinder body in a matching way through a driving shaft guide mechanism.

As an embodiment of the present invention, the driving shaft guide mechanism includes a retainer ring, a stainless steel gasket, a rubber seal ring, an upper guide ring and a lower guide ring; the driving shaft is connected with the cylinder body in a matching way through an upper guide ring and a lower guide ring; a check ring and a stainless steel gasket are arranged between the upper guide ring and the driving shaft; and the lower guide ring is also provided with a rubber sealing ring.

As an embodiment of the present invention, an upper boss is disposed on the top of the upper guide ring, and a first inner hole is disposed in the center; the upper guide ring is connected with the outer wall of the cylinder body in a matching way through an upper boss; the upper guide ring is fitted to the drive shaft through the first inner bore.

As an embodiment of the utility model, the bottom of the lower guide ring is provided with a lower boss, the middle part of the lower guide ring is provided with a groove, and the inner part of the lower guide ring is provided with a second inner hole; the lower guide ring is connected with the inner wall of the cylinder body in a matching way through a lower boss; the lower guide ring is assembled on the driving shaft through a second inner hole.

As an embodiment of the utility model, rubber seal sets up on the recess, rubber seal and cylinder body contact.

The utility model has the advantages that: the utility model discloses the plastics guide ring has not only played the drive shaft in the cylinder body and has connected the guide effect, has still replaced the plastic pad that needs to use when original drive shaft assembly, and this kind of novel structure can the fit clearance of effective control drive shaft and cylinder body to reach the effect that further increases pneumatic actuator's action life-span.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a schematic view of the upper guiding section structure of the present invention.

Fig. 3 is a schematic view of the structure of the lower guiding section of the present invention.

Description of reference numerals: 1. a cylinder body; 2. a cylinder cover; 3. a rack piston; 4. a cam; 5. a drive shaft; 6. a drive shaft guide mechanism; 61. a retainer ring; 62. a stainless steel gasket; 63. a rubber seal ring; 64. an upper guide ring; 641. an upper boss; 642. a first inner bore; 65. a lower guide ring; 651. a lower boss; 652. a groove; 653. a second bore.

Detailed Description

As shown in fig. 1-3, the driving shaft guide mechanism for the pneumatic actuator comprises a cylinder body 1, a cylinder cover 2, a rack piston 3, a cam 4 and a driving shaft 5; two ends of the cylinder body 1 are provided with cylinder covers 2; a rack piston 3 and a cam 4 are arranged in the cylinder body 1, and the cam 4 is connected with a driving shaft 5 in a matching way;

also comprises a driving shaft guide mechanism 6; the output end of the driving shaft 5 is matched and connected with the cylinder body 1 through a driving shaft guide mechanism 6;

the driving shaft guide mechanism 6 comprises a retainer ring 61, a stainless steel gasket 62, a rubber seal ring 63, an upper guide ring 64 and a lower guide ring 65; the driving shaft 5 is matched and connected with the cylinder body 1 through an upper guide ring 64 and a lower guide ring 65; a retainer ring 61 and a stainless steel gasket 62 are also arranged between the upper guide ring 64 and the driving shaft 5; the lower guide ring 65 is also provided with a rubber sealing ring 63.

The top of the upper guide ring 64 is provided with an upper boss 641, and the center of the upper guide ring is provided with a first inner hole 642; the upper guide ring 64 is connected with the outer wall of the cylinder body 1 in a matching way through an upper boss 641; the upper guide ring 64 is fitted to the drive shaft 5 through the first inner hole 642.

The bottom of the lower guide ring 65 is provided with a lower boss 651, the middle part of the lower guide ring is provided with a groove 652, and the inner part of the lower guide ring is provided with a second inner hole 653; the lower guide ring 65 is connected with the inner wall of the cylinder body 1 in a matching way through a lower boss 651; the lower guide ring 65 is fitted to the drive shaft 5 through the second inner hole 653.

The rubber seal 63 is arranged on the groove 652, and the rubber seal 63 is in contact with the cylinder body 1.

The utility model discloses the during operation is by rack piston 3 under the effect of air supply pressure, at 1 inside reciprocating motion that is of cylinder body to it is rotatory to drive shaft 5. At this time, the upper boss 641 of the upper guide ring 64 is clamped on the outer wall of the cylinder body 1, and the upper end of the upper guide ring 64 is provided with a retaining ring 61 and a stainless steel gasket 62; the lower boss 651 of the lower guide ring is clamped on the inner wall of the cylinder body 1, and the rubber seal 63 is sleeved in the groove 652. The first and second

inner holes

642 and 653 are cooperatively connected to the driving shaft 5, and the upper and

lower bosses

641 and 651 are cooperatively connected to the cylinder block 1.

The utility model discloses an upper guide ring 64 and lower guide ring 65 that adopt are the processing part, are different from the injection molding that plastic gasket adopted in the traditional structure, can its size of accurate control.

The utility model discloses the plastics guide ring has not only played the drive shaft in the cylinder body and has connected the guide effect, has still replaced the plastic pad that needs to use when original drive shaft assembly, and this kind of novel structure can the fit clearance of effective control drive shaft and cylinder body to reach the effect that further increases pneumatic actuator's action life-span.

Claims

1. A drive shaft guide mechanism for a pneumatic actuator comprises a cylinder body (1), a cylinder cover (2), a rack piston (3), a cam (4) and a drive shaft (5); two ends of the cylinder body (1) are provided with cylinder covers (2); a rack piston (3) and a cam (4) are arranged in the cylinder body (1), and the cam (4) is connected with a driving shaft (5) in a matching way;

the method is characterized in that: the device also comprises a driving shaft guide mechanism (6); the output end of the driving shaft (5) is matched and connected with the cylinder body (1) through a driving shaft guide mechanism (6);

the driving shaft guide mechanism (6) comprises a retainer ring (61), a stainless steel gasket (62), a rubber seal ring (63), an upper guide ring (64) and a lower guide ring (65); the driving shaft (5) is connected with the cylinder body (1) in a matching way through an upper guide ring (64) and a lower guide ring (65); a retainer ring (61) and a stainless steel gasket (62) are also arranged between the upper guide ring (64) and the driving shaft (5); and a rubber sealing ring (63) is also arranged on the lower guide ring (65).

2. The drive shaft guide mechanism for a pneumatic actuator as set forth in claim 1, wherein: the top of the upper guide ring (64) is provided with an upper boss (641), and the center of the upper guide ring is provided with a first inner hole (642); the upper guide ring (64) is connected with the outer wall of the cylinder body (1) in a matching way through an upper boss (641); the upper guide ring (64) is fitted to the drive shaft (5) through the first inner hole (642).

3. The drive shaft guide mechanism for a pneumatic actuator as set forth in claim 1, wherein: the bottom of the lower guide ring (65) is provided with a lower boss (651), the middle of the lower guide ring is provided with a groove (652), and the inner part of the lower guide ring is provided with a second inner hole (653); the lower guide ring (65) is connected with the inner wall of the cylinder body (1) in a matching way through a lower boss (651); the lower guide ring (65) is fitted to the drive shaft (5) through the second inner hole (653).

4. The drive shaft guide mechanism for a pneumatic actuator as set forth in claim 3, wherein: the rubber sealing ring (63) is arranged on the groove (652), and the rubber sealing ring (63) is in contact with the cylinder cover (2).