CN203051293U - Air-suspending frictionless cylinder with pressure-relieving groove - Google Patents
Air-suspending frictionless cylinder with pressure-relieving groove Download PDFInfo
- Publication number
- CN203051293U CN203051293U CN 201220749614 CN201220749614U CN203051293U CN 203051293 U CN203051293 U CN 203051293U CN 201220749614 CN201220749614 CN 201220749614 CN 201220749614 U CN201220749614 U CN 201220749614U CN 203051293 U CN203051293 U CN 203051293U
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- Prior art keywords
- piston
- cylinder
- throttle orifice
- air
- pressure relief
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- 239000000725 suspension Substances 0.000 claims description 9
- 238000004080 punching Methods 0.000 claims description 3
- 230000015572 biosynthetic process Effects 0.000 claims description 2
- 238000002955 isolation Methods 0.000 claims description 2
- 238000005516 engineering process Methods 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 230000002950 deficient Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000005461 lubrication Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 230000006837 decompression Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 239000002783 friction material Substances 0.000 description 1
- 239000004519 grease Substances 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000008041 oiling agent Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
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Abstract
An air-suspending frictionless cylinder with a pressure-relieving groove comprises a cylinder barrel, a piston, a piston rod, a front end cap and a back end cap, wherein the piston rod is connected with the piston through a piston connector, a gap exists between the piston and the cylinder barrel, the front end cap is mounted at the front end of the cylinder barrel, the back end cap is mounted at the back end of the cylinder barrel, the back end cap is provided with an air inlet, the front end cap is provided with an air outlet, air inlet holes are evenly formed in the face, near the cylinder air inlet, of the piston, orifices are evenly formed in the piston in a radial direction, first blind holes are punched in an axial direction of the air inlet holes and are communicated with the orifices, second blind holes, the diameter of which are bigger than the diameters of the first blind holes, are formed in the piston at the side near the air outlet of the cylinder, a loop of groove is formed in the outer cylindrical surface of the piston and is near the middle portion of the piston, holes are punched in the portion above the groove in radial direction and are communicated with the second blind holes to from a pressure-relieving groove, and the pressure-relieving groove is separated from the orifices. The air-suspending frictionless cylinder with the pressure-relieving groove has the advantages that effects of high pressure airflow and low pressure airflow on an air film are avoided and control accuracy is high.
Description
Technical field
The utility model relates to a kind of air supporting cylinder.
Background technique
Common cylinder adopts mechanical seal usually, has contact friction force between cylinder barrel and the piston.
Traditional low friction cylinder relies on and improves machining accuracy, adopts special low-friction material or grease lubrication to reduce friction, but has processing difficulties, cost height, difficult in maintenance and defective that the life-span is short; Perhaps by improving seal form, reduce frictional force, be applied to cylinder as the special sealing technique of German FESTO company's employing, adopt the one-way sealing circle, have very little resistance of taxing.Japan SMC company adopts ball guide sleeve technology and Gap Sealing Technology, should low friction cylinder at the uniform velocity property, high low pressure friction, tell and high frequency aspect all have breakthrough, yet there are some defectives too, such as to load sensitivity radially, complex structure, manufacturing difficulty are big, expensive.
For satisfying the requirement of aspects such as ultraprecise constant force output control, minute-pressure action control, the gas lubrication technology is realizing that zero friction cylinder is applied.Be that 201120080863.6 " a kind of nothing friction cylinder that has an air-bearing " just announced a kind of nothing friction cylinder according to the design of air supporting principle as number of patent application, leave minimum gap between cylinder barrel and the piston, the throttle orifice of even cloth is set at piston radial, piston rod by hollow and flexible pipe are the piston air feed in the cylinder, and connect by ball pivot and to make that not having the friction cylinder can bear certain radial load and seizure of piston not take place in cylinder.But the plenum system complexity by hollow piston rod and flexible pipe, assembling are loaded down with trivial details, easy care not, do not optimize there being the friction cylinder afterwards, pressurized air in employing cylinder self cavity volume is as oiling agent, gas is introduced in the gap, make piston in cylinder, be in complete state of suspension, piston do not contact each other with cylinder barrel, thereby eliminated the frictional force between the piston and cylinder barrel in the air cylinder structure.But, no matter adopt which kind of plenum system, owing to leave the gap between piston and the cylinder barrel, there is very big draught head between the hyperbaric chamber of cylinder and the low-pressure cavity, thereby between the gap, can form air pressure stream, directly influence the air pressure film that piston forms in the gap by throttle orifice, on the other hand, the prerequisite that air film forms is to have certain draught head in the gap, and raise near the gap air pressure of hyperbaric chamber one end, cause air-film thickness, pressure distribution inhomogeneous, stability, precision, the bearing capacity of this nothing friction cylinder all caused influence.
Summary of the invention
For the high low pressure air-flow that overcomes existing air supporting cylinder to the deficiency that air film exerts an influence, control accuracy is lower, the utility model provides a kind of high low pressure air-flow of effectively avoiding that the gas suspension of the band pressure relief groove that air film exerts an influence, control accuracy is higher is not had the friction cylinder.
The technological scheme that its technical problem that solves the utility model adopts is:
A kind of gas suspension with pressure relief groove does not have the friction cylinder, comprise cylinder barrel, piston, piston rod, front cover and rear end cover, described piston rod is connected with piston by the piston connecting head, there is the gap between described piston and cylinder barrel, described front cover is installed in the front end of cylinder barrel, described rear end cover is installed in the rear end of cylinder barrel, suction port is stamped in described rear end, described front end is stamped the air outlet, described piston has uniform inlet hole near the one side of cylinder air inlet, the uniform throttle orifice radially of described piston, described inlet hole is in axial direction made a call to first blind hole and is communicated with throttle orifice, described piston is provided with diameter second blind hole bigger than first blind hole near cylinder air outlet one side, described outside piston cylinder is provided with a circle groove near the middle part, the punching formation pressure relief groove that communicates with second blind hole radially from groove top, isolation mutually between described pressure relief groove and the throttle orifice.
Further, in the described throttle orifice orifice plug is arranged.
Further, pressure relief groove also can be split into other forms on the described outside piston post.
On the described piston radially throttle orifice be uniformly distributed along the circumference, and described throttle orifice has two groups in the axial direction at least, is furnished with pressure relief groove near the throttle orifice opposite side of cylinder air inlet.
The beneficial effects of the utility model mainly show: effectively avoid the high low pressure air-flow to air film exert an influence, air pressure, the control accuracy in equalizing lever and cylinder barrel gap be higher.
Description of drawings
Fig. 1 is the schematic representation that a kind of gas suspension with pressure relief groove does not have the friction cylinder.
Fig. 2 is the tomograph of piston.
Fig. 3 is piston structure figure.
Fig. 4 is the A-A sectional view of Fig. 3.
Fig. 5 is the B-B sectional view of Fig. 3.
Fig. 6 is the air-flow schematic diagram.
Embodiment
Below in conjunction with accompanying drawing the utility model is further described.
With reference to Fig. 1～Fig. 6, a kind of gas suspension with pressure relief groove does not have the friction cylinder, this cylinder is by cylinder barrel 3, piston 4, piston rod 7, front cover 2 and rear end cover 8 are formed, described piston rod 7 is connected with piston 4 by the piston connecting head, there are minimum gap 11 in 3 of described piston 4 and cylinder barrels, described end cap is installed in the two ends of cylinder barrel, on the described front cover 2 suction port 1 is arranged, on the rear end cover 8 air outlet is arranged, described piston 4 has uniform inlet hole 6 near the one side of cylinder air inlet, the uniform throttle orifice 5 radially of described piston, described inlet hole 6 is in axial direction made a call to first blind hole and is communicated with throttle orifice 5, described piston 4 has diameter second blind hole bigger than first blind hole near cylinder air outlet one side, described piston 4 external cylindrical surfaces are provided with a circle groove near the middle part, radially punching communicates with second blind hole and forms pressure relief groove 10 from the groove top, isolates mutually between described pressure relief groove 10 and the throttle orifice 5.
In the described throttle orifice orifice plug is arranged.Pressure relief groove 10 also can be split into other forms on the described outside piston post, can balanced gap internal air pressure, and promote air film to generate and get final product.On the described piston radially throttle orifice 5 be uniformly distributed along the circumference, and described throttle orifice has two groups in the axial direction at least, is furnished with pressure relief groove 10 near throttle orifice 5 opposite sides of cylinder air inlet.
Cylinder air inlet one side forms hyperbaric chamber 13 by cylinder barrel, end cap, piston, and cylinder air outlet one side forms low-pressure cavity 9 by cylinder barrel, end cap, piston, and hyperbaric chamber is rodless cavity.
Be further detailed below in conjunction with Fig. 6, design has pressure relief groove near medium position at piston, pressure relief groove communicates with low-pressure cavity, on the one hand the gas stream that will enter piston and cylinder barrel gap from hyperbaric chamber is discharged to low-pressure cavity after through certain crevice throttle damping decompression in pressure relief groove, do not influence the air film that throttle orifice forms on the piston, on the other hand, the pressurized gas that come out from throttle orifice flow in the gap and discharge from close pressure relief groove, avoid raising because of the gap internal air pressure, pressure reduction is little and can't form the uniform air film of thickness.
Gas enters hyperbaric chamber from suction port, promotes the piston motion, and pressurized gas enter in the piston from the piston intake hole simultaneously, form air film by throttle orifice in the gap of piston and cylinder barrel, and plenum system is simpler.
Above-mentioned example is used for explaining the utility model, rather than the utility model is limited, and in the protection domain of spirit of the present utility model and claim, the utility model is made any modification and change, all falls into protection domain of the present utility model.
Claims (3)
1. the gas suspension with pressure relief groove does not have the friction cylinder, comprise cylinder barrel, piston, piston rod, front cover and rear end cover, described piston rod is connected with piston by the piston connecting head, there is the gap between described piston and cylinder barrel, described front cover is installed in the front end of cylinder barrel, described rear end cover is installed in the rear end of cylinder barrel, suction port is stamped in described rear end, described front end is stamped the air outlet, it is characterized in that: described piston has uniform inlet hole near the one side of cylinder air inlet, the uniform throttle orifice radially of described piston, described inlet hole is in axial direction made a call to first blind hole and is communicated with throttle orifice, described piston is provided with diameter second blind hole bigger than first blind hole near cylinder air outlet one side, described outside piston cylinder is provided with a circle groove near the middle part, the punching formation pressure relief groove that communicates with second blind hole radially from groove top, isolation mutually between described pressure relief groove and the throttle orifice.
2. the gas suspension of band pressure relief groove as claimed in claim 1 does not have the friction cylinder, it is characterized in that: in the described throttle orifice orifice plug is arranged.
3. the gas suspension of band pressure relief groove as claimed in claim 1 or 2 does not have the friction cylinder, it is characterized in that: on the described piston radially throttle orifice be uniformly distributed along the circumference, and described throttle orifice has two groups in the axial direction at least, and the throttle orifice opposite side of close cylinder air inlet is furnished with pressure relief groove.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220749614 CN203051293U (en) | 2012-12-31 | 2012-12-31 | Air-suspending frictionless cylinder with pressure-relieving groove |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220749614 CN203051293U (en) | 2012-12-31 | 2012-12-31 | Air-suspending frictionless cylinder with pressure-relieving groove |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203051293U true CN203051293U (en) | 2013-07-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220749614 Expired - Lifetime CN203051293U (en) | 2012-12-31 | 2012-12-31 | Air-suspending frictionless cylinder with pressure-relieving groove |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203051293U (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103016443A (en) * | 2012-12-31 | 2013-04-03 | 浙江工业大学 | Air suspension friction-free air cylinder provided with pressure relief groove |
| CN103511392A (en) * | 2013-10-18 | 2014-01-15 | 浙江工业大学 | Constant power output device not affected by air tube disturbance |
| CN103527568A (en) * | 2013-10-18 | 2014-01-22 | 浙江工业大学 | Constant-force-output air-floating device with guide rail following function |
| CN103527569A (en) * | 2013-10-18 | 2014-01-22 | 浙江工业大学 | Constant torque output air floatation device |
| CN104806584A (en) * | 2015-04-20 | 2015-07-29 | 广东工业大学 | Frictionless quick-response balance system |
| CN107655627A (en) * | 2017-11-09 | 2018-02-02 | 上海市计量测试技术研究院 | A kind of sinusoidal pressure generating means |
-
2012
- 2012-12-31 CN CN 201220749614 patent/CN203051293U/en not_active Expired - Lifetime
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103016443A (en) * | 2012-12-31 | 2013-04-03 | 浙江工业大学 | Air suspension friction-free air cylinder provided with pressure relief groove |
| CN103016443B (en) * | 2012-12-31 | 2015-08-12 | 浙江工业大学 | A kind of gas suspension with pressure relief groove is without friction cylinder |
| CN103511392A (en) * | 2013-10-18 | 2014-01-15 | 浙江工业大学 | Constant power output device not affected by air tube disturbance |
| CN103527568A (en) * | 2013-10-18 | 2014-01-22 | 浙江工业大学 | Constant-force-output air-floating device with guide rail following function |
| CN103527569A (en) * | 2013-10-18 | 2014-01-22 | 浙江工业大学 | Constant torque output air floatation device |
| CN103511392B (en) * | 2013-10-18 | 2016-04-13 | 浙江工业大学 | A kind of constant force output device of unaffected by disturbance of air pipes |
| CN103527569B (en) * | 2013-10-18 | 2016-05-18 | 浙江工业大学 | A kind of permanent torque output air-floating apparatus |
| CN104806584A (en) * | 2015-04-20 | 2015-07-29 | 广东工业大学 | Frictionless quick-response balance system |
| CN104806584B (en) * | 2015-04-20 | 2017-02-01 | 广东工业大学 | Frictionless quick-response balance system |
| CN107655627A (en) * | 2017-11-09 | 2018-02-02 | 上海市计量测试技术研究院 | A kind of sinusoidal pressure generating means |
| CN107655627B (en) * | 2017-11-09 | 2023-08-11 | 上海市计量测试技术研究院 | Sinusoidal pressure generating device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20130710 Effective date of abandoning: 20150812 |
|
| RGAV | Abandon patent right to avoid regrant |