CN201973002U - Hydraulic cylinder with piston motion position capable of being measured - Google Patents
Hydraulic cylinder with piston motion position capable of being measured Download PDFInfo
- Publication number
- CN201973002U CN201973002U CN2011201113422U CN201120111342U CN201973002U CN 201973002 U CN201973002 U CN 201973002U CN 2011201113422 U CN2011201113422 U CN 2011201113422U CN 201120111342 U CN201120111342 U CN 201120111342U CN 201973002 U CN201973002 U CN 201973002U
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- rear end
- piston
- hydraulic cylinder
- piston rod
- rod
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Abstract
The utility model discloses a hydraulic cylinder with piston motion position capable of being measured, and relates to a hydraulic cylinder. The hydraulic cylinder with the piston motion position capable of being measured can convert straight-line displacement of a piston rod into angular displacement and realizes that protrusion of the piston rod can be accurately measured. The hydraulic cylinder comprises a piston, the piston rod, a cylinder body and a position sensing device, wherein the cylinder body is composed of a cylinder sleeve and sealing covers arranged at the front and the rear ends of the cylinder sleeve; the hydraulic cylinder has the characteristics that both the sealing cover at the front end and the sealing cover at the rear end are provided with center through holes; the piston rod is provided with a center hole; the position sensing device is provided with a threaded rod, a threaded sleeve and an angular displacement sensor; the threaded rod is positioned in the center hole of the piston rod; the rear end of the threaded rod is exposed outside the sealing cover at the rear end of the cylinder body; the threaded sleeve is fixedly connected with the rear end of the piston rod; the threaded sleeve is sheathed on the threaded rod and connected with the threaded rod through screw threads; and the angular displacement sensor is arranged outside the cylinder body and connected with the rear end of the threaded rod.
Description
Technical field
The utility model relates to oil hydraulic cylinder, especially relates to the oil hydraulic cylinder that a kind of piston motion position can be surveyed.
Background technique
Existing oil hydraulic cylinder generally comes the overhang of control piston bar by position limit switch, this control mode is more stiff, validity is not high, can not at will change the overhang of piston rod, must carry out relocating of position limit switch by manual operation, make manufacturing efficiency low, when position limit switch breaks down, very likely damage oil hydraulic cylinder.Development along with electronic parts and components, sensing measurement modes such as potentiometer type, condenser type, electromagnetic type, optical profile type are all increasingly mature, the overhang of controlling oil hydraulic cylinder by the measurement real time position not only can greatly make things convenient for production, significantly improve productivity, the more important thing is that the lifting of actuator's precision is played a kind of great promoting effect to the lifting of product precision.At present, more existing to the position-measurement device that the overhang of hydraulic cylinder piston rod is measured, be used for the overhang of control piston bar, they differ from one another.
Chinese patent CN201021684 discloses a kind of hydraulic cylinder travel measuring device that uses with the oil hydraulic cylinder configuration, be provided with encoder, the input end of this encoder is connected with a gear, this gear and tooth bar engagement, this tooth bar is parallel with the piston rod of tested liquid cylinder pressure, and an end of this tooth bar is fixedlyed connected with the front end of the piston rod of the front cover that protrudes from this tested liquid cylinder pressure by link.
Chinese patent CN101144495 discloses a kind of position measuring system that is used for oil hydraulic cylinder, it comprises at least one sensor, magnet and piston rod, piston rod has the roughly axial groove structure of metallic rod core and edge of high magnetic susceptibility, wherein, groove structure is filled with the metal that magnetic susceptibility is lower than bar core magnetic susceptibility, thereby sensor measurement is followed the bar core magnetic field that groove structure changes, and can determine the relative position and the absolute position of piston rod thus.
Summary of the invention
The purpose of this utility model provides and a kind ofly the piston rod straight-line displacement can be converted into angular displacement, realizes the oil hydraulic cylinder that can survey the piston motion position that the overhang of piston rod is accurately measured.
For achieving the above object, the utility model is by the following technical solutions:
The utility model comprises piston, piston rod, cylinder body and position sensing device, and cylinder body is made of cylinder sleeve and the sealing cover of being located at the cylinder sleeve rear and front end; Its characteristics are: forward end seal lid and rear end seal cover are equipped with central through bore; Piston rod is provided with center hole; Position sensing device is provided with screw rod, swivel nut and angular displacement sensor, and screw rod is arranged in the center hole of piston rod, and spiro rod rear end exposes the rear end of the cylinder block sealing cover, and swivel nut and piston rod rear end are connected, and swivel nut is enclosed within on the screw rod and with screw flight and is connected; Angular displacement sensor is located at the cylinder body outside and is connected with spiro rod rear end.
The forward end seal lid of described piston rod and cylinder body preferably is slidingly matched.
Preferably be provided with radial clearance between the center hole of described screw rod and piston rod.
The screw rod rear portion preferably is provided with the thrust step, and the thrust step is conflicted on the rear end of the cylinder block sealing cover, preferably sets firmly the tension lid on the rear end seal cover inwall, and the tension lid is enclosed within the screw rod rear portion and is pressed on the described thrust step, can prevent that like this screw axial from moving.
Spiro rod rear end preferably is provided with locking nut.
Angular displacement sensor is preferably selected existing optical encoding angular displacement sensor or magnetic coding angular displacement sensor etc. for use.
Cylinder sleeve, forward end seal lid, rear end seal cover, piston rod and screw rod are preferably coaxial inner conductor.
Compared with the prior art, the utlity model has following outstanding advantage:
The utility model is the angular displacement that the straight-line displacement of piston rod is converted to screw rod, by the angle displacement measurement to screw rod, promptly obtains the overhang of piston rod, by the requirement of measuring accuracy, can design the dependency structure parameter.When piston rod moved axially, the swivel nut that links to each other with piston rod must drive screw rod and rotate, and this just is converted into the straight-line displacement of piston rod the angular displacement of screw rod.Signal can be passed to outside surveying instrument by sensor, thereby realize the piston rod overhang is measured in real time.
Computational methods are as follows:
Suppose that pitch P is 50mm, number of starts n is 2, and then helical pitch is 100mm, screw diameter d
2Be 40mm, then have
Can be in the hope of lift angle
It is 38.50 °.When piston rod when moving right a helical pitch, then screw rod turns over 360 °, promptly piston rod will move axially
Screw rod just turns over 1 °.Measure the angle that screw rod turns over, can obtain piston rod and move axially numerical value (being the piston rod overhang).If require the axially movable distance of piston rod to be accurate to 0.01mm, then the measurement of angle need be accurate to 0.0277 °.If adopt the magnetic encoded transducer, when the diameter of the magnetic drum of magnetic encoded transducer was 200mm, then its girth was 628.32mm, and 0.0277 ° of pairing arc length is 0.048mm, that is to say that the magnetic grid scale on the magnetic drum will reach the precision of the 10-2mm order of magnitude.As from the foregoing, the parameters such as pitch, lift angle and cylinder diameter of screw rod can be designed, so just needed measuring accuracy can be realized according to needed measuring accuracy.Because difficulty is measured in the straight-line displacement of piston rod overhang in the real-time working condition, the utility model is measured by the piston rod overhang is converted to angular displacement, can reduce the size of measuring device greatly, thereby is convenient for measuring the installation and maintenance of transposition.The utility model can be realized control automatically, and antijamming capability is strong, can realize the measurement of piston rod overhang absolute position.By measurement, just can realize controlling automatically the stroke of oil hydraulic cylinder to the piston rod overhang.
Description of drawings
Fig. 1 is the utility model embodiment's a structural representation.
Embodiment
Referring to Fig. 1, the utility model comprises piston 6, piston rod 23, cylinder body 4, forward end seal lid 9, rear end seal cover 1 and position sensing device.Forward end seal lid 9 and rear end seal cover 1 are equipped with central through bore, all are locked on cylinder sleeve 4 ports by bolt.Piston rod is provided with center hole.Piston rod 23 is slidingly matched with forward end seal lid 9.Position sensing device is provided with screw rod 7, swivel nut 5 and angular displacement sensor and (selects magnetic coding angular displacement sensor for use, comprise marked body 17 and sensor probe 20), 18, screw rod 7 is arranged in the center hole 10 of piston rod 23, has radial clearance between the center hole 10 of screw rod 7 and piston rod 23.Rear end seal cover 1 is exposed in screw rod 5 rear ends, and screw rod 7 rear ends are provided with locking nut 18.Swivel nut 5 is fastened on piston rod 23 rear ends, and swivel nut 5 is enclosed within on the screw rod 7 and with screw rod 7 and is threaded.Screw rod 7 rear portions are provided with thrust step 71, and thrust step 71 is conflicted on rear end seal cover 1 inwall, and rear end seal cover 1 tightens intrinsic tension lid 13, and tension is covered 13 and is enclosed within screw rod 7 rear portions and is pressed on the described thrust step 71, can prevent that like this screw rod 7 from moving axially.Cylinder sleeve 4, forward end seal lid 9, rear end seal cover 1, piston rod 23, screw rod 7 and tension are covered 13 and are coaxial inner conductor.Angular displacement sensor is located at the cylinder body outside and is connected with screw rod 7 rear ends.Angular displacement sensor is selected existing magnetic coding angular displacement sensor (also can be photoelectric coding angular displacement sensor etc.) for use, and marked body 17 is connected with screw rod 7 rear ends, and sensor probe 20 is connected with marked body 17.The output line of sensor probe 20 is connected with externally measured instrument, and surveying instrument adopts existing surveying instrument.Label 11 is an end connection before the piston rod 23, label 19 is rear end seal cover 1 a peripheral hardware link, label 3 and 8 is respectively liquid entrance, label 12,26 is seal ring, label 15 is a labyrinth, the effect of labyrinth 15 is to arrive seal ring 26 again after allowing the pressure head of oil hydraulic cylinder descend, the excessive seal ring 26 that makes of pressure that prevents the oil hydraulic cylinder inner chamber is pressed on the screw rod 7, thereby the rotation of avoiding screw rod 7 is subjected to big resistance, can prevent effectively that the sharp wear of seal ring 26 and screw rod 7 are subjected to warping force to produce moderate finite deformation.
Claims (7)
1. the oil hydraulic cylinder that the piston motion position can be surveyed comprises piston, piston rod, cylinder body and position sensing device, and cylinder body is made of cylinder sleeve and the sealing cover of being located at the cylinder sleeve rear and front end; It is characterized in that: forward end seal lid and rear end seal cover are equipped with central through bore; Piston rod is provided with center hole; Position sensing device is provided with screw rod, swivel nut and angular displacement sensor, and screw rod is arranged in the center hole of piston rod, and spiro rod rear end exposes the rear end of the cylinder block sealing cover, and swivel nut and piston rod rear end are connected, and swivel nut is enclosed within on the screw rod and with screw flight and is connected; Angular displacement sensor is located at the cylinder body outside and is connected with spiro rod rear end.
2. the oil hydraulic cylinder that a kind of piston motion as claimed in claim 1 position can be surveyed is characterized in that the forward end seal lid of described piston rod and cylinder body is slidingly matched.
3. the oil hydraulic cylinder that a kind of piston motion as claimed in claim 1 position can be surveyed is characterized in that being provided with radial clearance between the center hole of described screw rod and piston rod.
4. the oil hydraulic cylinder that a kind of piston motion as claimed in claim 1 position can be surveyed, it is characterized in that the screw rod rear portion is provided with the thrust step, the thrust step is conflicted on the rear end of the cylinder block sealing cover, sets firmly the tension lid on the rear end seal cover inwall, and the tension lid is enclosed within the screw rod rear portion and is pressed on the described thrust step.
5. the oil hydraulic cylinder that a kind of piston motion as claimed in claim 1 position can be surveyed is characterized in that spiro rod rear end is provided with locking nut.
6. the oil hydraulic cylinder that a kind of piston motion as claimed in claim 1 position can be surveyed is characterized in that angular displacement sensor adopts optical encoding angular displacement sensor or magnetic coding angular displacement sensor.
7. the oil hydraulic cylinder that a kind of piston motion as claimed in claim 1 position can be surveyed is characterized in that cylinder sleeve, forward end seal lid, rear end seal cover, piston rod and screw rod are coaxial inner conductor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201113422U CN201973002U (en) | 2011-04-15 | 2011-04-15 | Hydraulic cylinder with piston motion position capable of being measured |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201113422U CN201973002U (en) | 2011-04-15 | 2011-04-15 | Hydraulic cylinder with piston motion position capable of being measured |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201973002U true CN201973002U (en) | 2011-09-14 |
Family
ID=44578105
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011201113422U Expired - Fee Related CN201973002U (en) | 2011-04-15 | 2011-04-15 | Hydraulic cylinder with piston motion position capable of being measured |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201973002U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102121491A (en) * | 2011-04-15 | 2011-07-13 | 厦门大学 | Hydraulic cylinder with position sensing device |
| CN103742479A (en) * | 2014-01-01 | 2014-04-23 | 陈奇 | Hydraulic oil cylinder device capable of achieving displacement detection and data communication |
| CN106441718A (en) * | 2016-11-11 | 2017-02-22 | 中国船舶重工集团公司第七0三研究所 | Marine water-pressure-resistant seal pressurizing device |
| CN109764023A (en) * | 2019-03-12 | 2019-05-17 | 韶关市伟光液压油缸有限公司 | A kind of dam sluice gate oil cylinder of built-in rotary encoder |
| CN114894079A (en) * | 2022-05-09 | 2022-08-12 | 石家庄开发区天远科技有限公司 | Hydraulic cylinder piston rod detection system and method |
-
2011
- 2011-04-15 CN CN2011201113422U patent/CN201973002U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102121491A (en) * | 2011-04-15 | 2011-07-13 | 厦门大学 | Hydraulic cylinder with position sensing device |
| CN103742479A (en) * | 2014-01-01 | 2014-04-23 | 陈奇 | Hydraulic oil cylinder device capable of achieving displacement detection and data communication |
| CN106441718A (en) * | 2016-11-11 | 2017-02-22 | 中国船舶重工集团公司第七0三研究所 | Marine water-pressure-resistant seal pressurizing device |
| CN109764023A (en) * | 2019-03-12 | 2019-05-17 | 韶关市伟光液压油缸有限公司 | A kind of dam sluice gate oil cylinder of built-in rotary encoder |
| CN114894079A (en) * | 2022-05-09 | 2022-08-12 | 石家庄开发区天远科技有限公司 | Hydraulic cylinder piston rod detection system and method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110914 Termination date: 20140415 |