CN207609642U - A kind of general double acting air supporting friction-free air cylinder - Google Patents

Abstract

The utility model provides a kind of general double acting air supporting friction-free air cylinder, including one be mounted on plain radial bearing by sleeve and with the air floating piston of piston rod matched air bearing and a designed, designed.It is proceeded in the gap between air floating piston and cylinder barrel by gas supply outside hollow piston rod and forms air film, then gas is discharged through hollow piston rod again.In this way, the plunger stem flange component across air bearing can be without frictionally moving.Due to the effect of plain radial bearing, to a certain extent can to avoid because piston piston rod assembly caused by rigging error or radial load it is stuck the cylinder barrel the phenomenon that.The utility model is vented by external independent gas supply, certainly, it is ensured that friction free movement still may be implemented in two chamber of cylinder under the action of the underpressure.

Description

A kind of general double acting air supporting friction-free air cylinder

Technical field

The utility model is related to a kind of floating cylinder, specifically a kind of general double acting air supporting friction-free air cylinder.

Background technology

Under normal conditions, common cylinder all has friction, friction to result between piston packing and inner wall of cylinder, And between piston rod and the dust-proof seal ring of end cap.

Traditionally, the method for cylinder reduction friction is usually improved machining accuracy to reduce surface roughness, select and rub The low material of coefficient, using novel lubricating grease and improve seal form.Although conventional method can reduce to a certain extent The frictional force of cylinder, but there is the shortcomings that processing and manufacturing of high cost, processing difficult in maintenance and short life.With the leather of technology Newly, the use of clearance seal and ball guide sleeve technology greatly reduces the frictional force of cylinder, but its to radial load-sensitive, It is complicated, cost is very high；The frictional force that cylinder is significantly reduced using cooperation linear ball bearing of diaphragm bellows sealing, However the structure of its diaphragm makes its stroke limiting.

To make cylinder realize, high-precision power output control, the friction-free air cylinder based on gas lubrication technology are suggested.In State utility application CN102155465A discloses a kind of friction-free air cylinder with air-bearing, it is by hollow Piston rod and hose be the piston that is designed with static pressure air-bearing principle supply to realize piston and inner wall of cylinder without friction, together When by flexural pivot connect be not easy by piston rod and piston enable cylinder to bear certain radial load it is stuck.But, hollow work Stopper rod only has external air supply channel, and the gap that external compressed air flows to piston and cylinder inner wall by throttling piston hole is formed Two chambers of cylinder can only be flowed to after high pressure air film loading piston, this can undoubtedly interfere two chamber of cylinder to control.In addition, when two cavity pressures When close with the external pressure of air floating piston independent gas supply, gas film pressure will be unable to loading piston, and no friction will be unable to reality It is existing.Chinese utility model patent application CN103047221A announces a kind of double acting gas suspension friction-free air cylinder, it is to use gas The compressed air of two chamber of cylinder be air floating piston supply to be formed air film supported piston realize it is non-contact, afterwards by intermediate gas pressure relief slot and Hollow piston rod is arranged to air.However, such design has the drawback that, i.e., when the air pressure of two chambers is smaller, can not produce Life, which is enough loading piston, makes piston and the discontiguous air film of inner wall of cylinder, then this friction-free air cylinder just fails.Therefore, above-mentioned Can air supporting friction-free air cylinder work normally the operating air pressure for being all limited to two chambers.

Utility model content

In view of the deficiencies of the prior art, the utility model proposes a kind of general double acting friction-free air cylinder, which rubs It is to form the air film supported realization of high pressure without friction, then automatically from piston circumferential direction both ends by independent gas supply to wipe cylinder air floating piston Exhaust, work are not influenced by two cavity pressure sizes in annular pressure release groove.

The utility model is to realize above-mentioned technical purpose by following technological means.

A kind of general double acting air supporting friction-free air cylinder, including piston rod, air floating piston, cylinder barrel, the two of cylinder barrel Drive end bearing bracket, rear end cap is respectively set in end, and the piston rod extends in cylinder barrel across drive end bearing bracket, fixes company with air floating piston Connect, piston rod by air bearings support on drive end bearing bracket, air floating piston be located in cylinder barrel and between cylinder barrel there are Gap；It is characterized in that, the piston rod penetrates air floating piston,

There is big cavity, the areola that diameter does not wait, the outer circle at the air floating piston both ends inside the air floating piston It is provided with first annular pressure release groove and the second annular pressure release groove on peripheral wall, diameter is circumferentially provided in the circumferential wall of air floating piston To the throttle orifice with balancing slit, be provided with the first axially extending inner passage, air floating piston end in air floating piston circumferential wall Radially-arranged second inner passage is equipped in facing the wall and meditating, the second inner passage is connected to areola and the first inner passage, and air supporting is lived Fill in the third inner passage that the first annular pressure release groove slot bottom in the circumferential wall of other end end is equipped with the first inner passage of connection；

To setting, mutually disconnected exhaust passage and inlet channel, exhaust passage run through entire piston to the piston rod Bar, inlet channel terminate at piston rod inner, and are provided on piston rod inside radial, connection inlet channel and air floating piston The sidewise hole of big cavity；

Areola is blocked in the end of the piston rod, and exhaust passage is connected to areola；The piston rod is by air bearing Compressed air out be formed by it is air film supported, the piston by outside provide the gentle inner wall of cylinder of the entrance piston it Between gap it is air film supported.

Further, sleeve, plain radial bearing are set between air bearing and drive end bearing bracket, air-flow is set on the sleeve Road junction is that the air bearing of Porous conveys compressed air.

Further, the plain radial bearing is fixed on by baffle ring and hole card spring on drive end bearing bracket.

Further, it is respectively equipped with first annular groove on the end face of sleeve and on the step of drive end bearing bracket and the second annular is recessed Slot, the ring type seal of cyclic annular raised line is equipped between the baffle ring and drive end bearing bracket for fixing the plain radial bearing, and annular is close The cyclic annular raised line of seal inner and outer ring be embedded in respectively in first annular groove and second annular groove.

Further, the piston rod is equipped with the adjusting screw for the gas flow size that can adjust exhaust passage.

Further, it is axially and symmetrically to divide that the radial throttle orifice with balancing slit is circumferentially provided in the piston circumferential wall The N of cloth is arranged, wherein N>=2；M are circumferentially uniformly distributed, wherein M>=3.

Further, on the piston, the first inner passage, the second inner passage, third inner passage quantity be L It is a, wherein L>=2, L the first inner passages, the second inner passage, third inner passage are uniformly distributed axially.

Further, third inner passage is the radially blind hole that opens up of first annular pressure release bottom portion of groove, inside second Channel is the through-hole that the second annular pressure release bottom portion of groove radially opens up；First inner passage is the second annular pressure release groove place The blind hole that end face opens up in an axial direction, the second annular pressure release groove end face where the second annular pressure release groove opening by blocking up Head is blocked.

General double acting air supporting friction-free air cylinder described in the utility model, external compression air by inlet channel via Sidewise hole is entered in piston and is flowed into piston and cylinder barrel from the throttle orifice of the piston circumferential band balancing slit again after big cavity Gap between wall, then air-flow by the annular pressure release groove near piston circumferential direction both ends via in the piston The exhaust passage that portion channel is pooled to after areola out of described piston rod is arranged to air.The piston rod is come out by air bearing Compressed air be formed by it is air film supported, the piston by outside provide into gap between the gentle inner wall of cylinder of piston It is air film supported.

The air bearing is mounted on plain radial bearing by sleeve, can due to the introducing of plain radial bearing To allow in assembling process there are certain bias, it is empty that compression to the air bearing of Porous is led to by the air-flow road junction on sleeve Gas, so as to be realized without friction between piston rod and air bearing.

The beneficial effects of the utility model are mainly manifested in：It is only to air floating piston and air bearing using external compression air Vertical gas supply establishes air film and realizes that, without friction, air floating piston circumferential direction both ends are provided with annular gas pressure relief slot, annular gas pressure relief slot by piston and The exhaust passage of piston rod inner is connected to ambient atmosphere, and adjusts exhaust outlet size by adjusting screw；Even if in two cavity pressures When close with the clearance pressure of the interior casing wall of piston-, or when two cavity pressures are smaller, cylinder can be ensured normally without friction operation State is not influenced by two cavity pressures in cylinder.

Description of the drawings

Fig. 1 is the schematic diagram of general double acting air supporting friction-free air cylinder described in the utility model；

Fig. 2 is the partial cutaway view that piston rod rotates about the axis 90 ° in Fig. 1；

Fig. 3 is the view in full section of front end cover in Fig. 1；

(a), (b) are the front view and complete section left view of thin ring type seal respectively in Fig. 4；

Fig. 5 is the view in full section of piston rod in Fig. 1；

Fig. 6 is the semi-cutaway of piston in Fig. 1；

Fig. 7 is Section A-A figure.

In figure：

1- adjusting screws, 2- air-flows road junction, 3- drive end bearing brackets, 4- air bearing, 5- plain radial bearings, 6- rod chamber air inlets Mouthful, 7- cylinder barrels, 8- exhaust passages, 9- piston rods, the first annular pressure release grooves of 10-, 11- throttle orifices, 12- air floating pistons, The annular pressure release grooves of 13- second, 14- rear end caps, 15- rodless cavity air inlets, the first O-ring seals of 16-, the first sealing rings of 17-, 18- sidewise holes, 19- screw threads, the second sealing rings of 20-, 21- inlet channels, the second O-ring seals of 22-, 23- ring type seals, 24- baffle rings, 25- hole card springs, 26- sleeves, the big cavitys of 27-, 28- air bearing static sealing rings, 29- areolas, in 30- first Portion channel, 31- thirds inner passage, the second inner passages 32-, 33- plugs, 34- second annular grooves, 35- are first annular recessed Slot,.

Specific implementation mode

Below in conjunction with the accompanying drawings and specific embodiment is further described the utility model, but the guarantor of the utility model Shield range is not limited to this.

The utility model passes through external compression air pair using the air floating piston of static pressure air-bearing principle design friction-free air cylinder Air floating piston supplies, and compressed air passes through external cylindrical surface and cylinder barrel internal face of the circumferentially uniformly distributed throttle orifice of piston to piston Between gap injection high pressure draught form air film supported piston.Similarly, the Porous air axis that piston rod is supplied by outside The air-flow for holding injection is formed by air film support.It is formed by motion parts in this way, being connected through a screw thread by piston and piston rod It can be realized with the stationary part of the formation such as cylinder barrel, end cap non-contact.Porous air bearing part passes through centripetal joint shaft It holds on drive end bearing bracket, the requirement of piston axis and piston rod axis concentricity can be reduced to a certain extent.Centripetal joint The sealing of bearing is to coordinate the groove in drive end bearing bracket and on sleeve to realize by special thin ring type seal, in rod chamber Compressed air can make the tighter of thin ring type seal patch.

The utility model is further illustrated with example below in conjunction with the accompanying drawings, the purpose of this utility model and effect will be brighter It is aobvious.

Figures 1 and 2 show that the complete section schematic diagram and piston rod of the air supporting friction-free air cylinder rotate about the axis 90 ° Partial cutaway view afterwards, the general double acting air supporting friction-free air cylinder, including piston rod 9, air floating piston 12, cylinder barrel 7, gas The both ends of cylinder barrel 7 are respectively set drive end bearing bracket 3, rear end cap 14, the piston rod 9 extends to across drive end bearing bracket 3 in cylinder barrel 7, It is fixedly connected with air floating piston 12, piston rod 9 is supported on by air bearing 4 on drive end bearing bracket 3, and air floating piston 12 is located at cylinder barrel In 7 and there are gaps between cylinder barrel 7；It is characterized in that, the piston rod 9 penetrates air floating piston 12.

12 inside of the air floating piston has big cavity 27, the areola 29 that diameter does not wait, 12 both ends of the air floating piston The annular pressure release groove 13 of first annular pressure release groove 10 and second, the circumferential wall of air floating piston 12 are provided on the outer circle wall in portion On be circumferentially provided with the radial throttle orifice 11 with balancing slit, be provided in axially extending first in 12 circumferential wall of air floating piston Portion channel 30,12 end-face wall of air floating piston is interior to be equipped with radially-arranged second inner passage 32, and the second inner passage 32 is connected to small Cavity 29 and the first inner passage 30, first annular 10 slot bottom of pressure release groove in 12 other end end circumferential wall of air floating piston Third inner passage 31 equipped with the first inner passage 30 of connection.

Mutually disconnected exhaust passage 8 and inlet channel 21, exhaust passage 8 run through entire to the axial setting of the piston rod 9 Piston rod 9, inlet channel 21 terminate inside piston rod 9, and be provided on piston rod 9 it is radial, connection inlet channel 21 with The sidewise hole 18 of 12 inside of air floating piston cavity 27 greatly.Areola 29 is blocked in the end of the piston rod 9, exhaust passage 8 with it is small Cavity 29 is connected to；The compressed air that the piston rod 9 is come out by air bearing 4 be formed by it is air film supported, the piston 12 by Outside provide between 7 inner wall of the piston 12 and cylinder barrel gap it is air film supported.

Piston rod 9 and air floating piston 12 are connected by screw thread 19, and 12 two end faces of piston rod 9 and air floating piston go out to be set respectively The first sealing ring 17 and the sealing of the second sealing ring 20 are set, external compression air is entered by inlet channel 21 via sidewise hole 18 After big cavity 27 in piston 12 air floating piston 12 and cylinder are flowed into from the throttle orifice 11 of 12 circumferential band balancing slit of air floating piston again Gap between 7 inner wall of cylinder barrel, then air-flow pass through the first annular pressure release groove 10 and near 12 both ends of air floating piston In third inner passage 31 that second ring pressure release groove 13 is mutually passed through via the inside of air floating piston 12, the first inner passage 30 and second After portion channel 32 is pooled to areola 29,8 row of exhaust passage out of piston rod 9 is to air.Piston-cylinder bar assembly and cylinder Between there are two do not contact only lean on air film support region, the two regions are realized using static pressure air-bearing principle.

As shown in Fig. 2, on the piston 12, the first inner passage 30, the second inner passage 32, third inner passage 31 Quantity is L, wherein L>=2, L the first inner passages 30, the second inner passage 32, third inner passage 31 are axial uniform Distribution.Third inner passage 31 is the radially blind hole that first annular 10 bottom of pressure release groove opens up, and the second inner passage 32 is The through-hole that second annular 13 bottom of pressure release groove radially opens up；First inner passage 30 is the second annular 13 institute of pressure release groove In the blind hole that end face opens up in an axial direction, the described second opening in the second annular 13 place end face of pressure release groove of annular pressure release groove 13 Mouth is blocked by plug 33.

As shown in figure 3, air bearing 4 is mounted on by sleeve 26 on plain radial bearing 5, pass through plain radial bearing Effect is to improve the problem that piston rod is eccentric.

On the end face of sleeve 26 and it is respectively equipped with first annular groove 35 and second annular groove on the step of drive end bearing bracket 3 34, for fixing between the baffle ring 24 of the plain radial bearing 5 and drive end bearing bracket 3 ring type seal 23 for being equipped with cyclic annular raised line, The cyclic annular raised line of 23 inner and outer ring of ring type seal be embedded in respectively in first annular groove 35 and second annular groove 34.Figure (a) in 4, (b) show the front view and complete section left view of thin ring type seal, the sealing ring inner ring and outer rings respectively with set The first annular groove 35 and second annular groove 34 of 3 inside of cylinder 26 and drive end bearing bracket match, in rod chamber under the action of pressure Thin slice, which can be attached on sleeve 26 and baffle ring 24, realizes sealing.

Fig. 5 shows that the view in full section of piston rod, piston rod 9 are connected with piston 12 by bolted connection, and compression is empty Gas flows to big cavity 27 in piston 12 from the sidewise hole 18 of 21 end both sides of inlet channel, and outlet passageway 8 is through-hole, can pass through tune It saves screw 1 and adjusts gas outlet size.

In an example shown in Fig. 1~7, piston 12 has 4 groups of throttle orifices with balancing slit in the axial direction, every group 6.

Air floating piston 12 involved by the utility model can have various structures, meet the group number of throttle orifice in the axial direction More than or equal to 2 and every group of number is more than or equal to 3；Involved piston rod 9 can be that single rod can also be double rods, double Rod, that is, one end air inlet other end outlet.

The embodiment is the preferred embodiment of the utility model, but the utility model is not limited to above-mentioned embodiment party Formula, without departing substantially from the substantive content of the utility model, those skilled in the art can make any apparent Improvement, replacement or modification belong to the scope of protection of the utility model.

Claims (8)

1. a kind of general double acting air supporting friction-free air cylinder, including piston rod (9), air floating piston (12), cylinder barrel (7), gas Drive end bearing bracket (3), rear end cap (14) is respectively set in the both ends of cylinder barrel (7), and the piston rod (9) extends to gas across drive end bearing bracket (3) It is fixedly connected in cylinder barrel (7), with air floating piston (12), piston rod (9) is supported on by air bearing (4) on drive end bearing bracket (3), gas Floating piston (12) is located in cylinder barrel (7) and there are gaps between cylinder barrel (7)；It is characterized in that, the piston rod (9) Air floating piston (12) is penetrated,

There is big cavity (27), the areola (29) that diameter does not wait, the air floating piston (12) inside the air floating piston (12) First annular pressure release groove (10) and the second annular pressure release groove (13), air floating piston are provided on the outer circle wall at both ends (12) it is circumferentially provided with the radial throttle orifice (11) with balancing slit in circumferential wall, is provided in air floating piston (12) circumferential wall Axially extending the first inner passage (30), air floating piston (12) end-face wall is interior to be equipped with radially-arranged second inner passage (32), the second inner passage (32) connection areola (29) and the first inner passage (30), air floating piston (12) other end end First annular pressure release groove (10) slot bottom in circumferential wall is equipped with the third inner passage (31) of connection the first inner passage (30)；

Axially mutually disconnected exhaust passage (8) and inlet channel (21), exhaust passage (8) run through the piston rod (9) for setting Entire piston rod (9), inlet channel (21) terminate at piston rod (9) inside, and radial, connection is provided on piston rod (9) The sidewise hole (18) of inlet channel (21) and the internal big cavity (27) of air floating piston (12)；

Areola (29) is blocked in the end of the piston rod (9), and exhaust passage (8) is connected to areola (29)；The piston rod (9) compressed air come out by air bearing (4) is formed by air film supported, and the piston (12) enters institute by what outside provided State the air film supported of gap between piston (12) and cylinder barrel (7) inner wall.

2. friction-free air cylinder as described in claim 1, which is characterized in that set is arranged between air bearing (4) and drive end bearing bracket (3) Cylinder (26), plain radial bearing (5), setting air-flow road junction (2) is that the air bearing (4) of Porous conveys on the sleeve (26) Compressed air.

3. friction-free air cylinder as claimed in claim 2, which is characterized in that the plain radial bearing (5) passes through baffle ring (24) It is fixed on drive end bearing bracket (3) with hole card spring (25).

4. friction-free air cylinder as claimed in claim 3, which is characterized in that the step of the end face and drive end bearing bracket (3) of sleeve (26) On be respectively equipped with first annular groove (35) and second annular groove (34), the gear for fixing the plain radial bearing (5) It encloses between (24) and drive end bearing bracket (3) and is equipped with the ring type seal (23) of cyclic annular raised line, the ring-type of ring type seal (23) inner and outer ring Raised line is embedded in respectively in first annular groove (35) and second annular groove (34).

5. friction-free air cylinder as described in claim 1, which is characterized in that the piston rod (9), which is equipped with, can adjust exhaust The adjusting screw (1) of the gas flow size in channel (8).

6. friction-free air cylinder as described in claim 1, which is characterized in that be circumferentially provided with diameter in piston (12) circumferential wall To the throttle orifice (11) with balancing slit be axially and symmetrically be distributed N row, wherein N>=2；M are circumferentially uniformly distributed, wherein M> =3.

7. friction-free air cylinder as claimed in claim 6, which is characterized in that on the piston (12), the first inner passage (30), Second inner passage (32), the quantity of third inner passage (31) are a for L, wherein L>The first inner passages (30)=2, L, the Two inner passages (32), third inner passage (31) are uniformly distributed axially.

8. friction-free air cylinder as claimed in claim 7, which is characterized in that third inner passage (31) are that first annular pressure release is recessed The radially blind hole that slot (10) bottom opens up, the second inner passage (32) are that second annular pressure release groove (13) bottom is radially opened If through-hole；The blind hole that end face where first inner passage (30) is the second annular pressure release groove (13) opens up in an axial direction, it is described Opening of the second annular pressure release groove (13) in end face where the second annular pressure release groove (13) is blocked by plug (33).