CN106704312A - Digital hydraulic cylinder with novel feedback mechanism - Google Patents
Digital hydraulic cylinder with novel feedback mechanism Download PDFInfo
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- CN106704312A CN106704312A CN201510788835.2A CN201510788835A CN106704312A CN 106704312 A CN106704312 A CN 106704312A CN 201510788835 A CN201510788835 A CN 201510788835A CN 106704312 A CN106704312 A CN 106704312A
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Abstract
The invention discloses a digital hydraulic cylinder structural design with a novel feedback mechanism. The digital hydraulic cylinder mainly comprises a stepper motor part with driving capacity, a digital cylinder piston rod capable of realizing digital displacement, the feedback mechanism capable of returning the digital displacement to a valve element of a slide valve through a ball screw and a fixedly connected nut, and a cylinder body capable of connecting with an experiment platform and achieving a support effect. The feedback mechanism capable of returning the digital displacement to the valve element of the slide valve through the ball screw and the fixedly connected nut mainly includes a ball screw, a connecting piece, and a large nut connected with the valve element. The piston rod capable of realizing digital displacement mainly includes a piston rod part, and a nut fixedly connected with the piston rod and forming a travel motion pair with a lead screw. The connecting piece for fixedly connecting the lead screw with the large nut mainly includes a disc for limiting axial displacement of the large nut and fixedly connected with the cylinder body, and a fixed bearing projection and a bearing for achieving a stable connecting effect. The cylinder body for achieving the support effect mainly includes a cylinder shell, an oil access pipe, and space for moving the slide valve and the piston rod inside; and an internal chute enables the piston rod to generate no rotation so as to guarantee the precision of mechanical feedback quantities.
Description
One, technical fields
The present invention relates to mechanical engineering field, and in particular to one kind hasIt is newThe Numeric hydraulic cylinder of feedback mechanism.
Two, background technologies
The present invention is so that for the purpose of hydraulic cylinder realization digitlization displacement, enhancing functional reliability, current all servo hydraulic cylinder displacements are continuous, the large-scale control devices of control needs, and are separated with cylinder body, it is impossible to realized structure-integrated.
The driving of stepper motor is the key factor that hydraulic cylinder realizes digitlization displacement；The present invention is moved using driving stepper motor valve core of the spool valve, and feedback mechanism is realized with mechanical structure, and positioned at digital cylinder interior, precision is higher, so the present invention exactly solves hydraulic cylinder and realizes digitlization displacement, functional reliability can be strengthened and structure-integrated product is realized.
The control mode of current hydraulic cylinder mainly has two kinds：Servo control mode and Direct digital control.SERVO CONTROL typically uses close-loop control mode, and its high precision, frequency response are fast but expensive, mainly amplifies to control servo valve or proportioning valve through D/A switch and servo by microcomputer, reaches the purpose of hydraulic system Digital Control.Direct digital control is to study more hydraulic control mode at present, can be divided into two types:A kind of is the pulse width modulation controlled to high-speed switch valve.
The three, content of the invention
The present invention hasIt is newThe Numeric hydraulic cylinder of feedback mechanism, as the drive device of digital cylinder valve core of the spool valve, meets stepping requirement using stepper motor, and reducing energy consumption saves energy.
One kind hasIt is newThe Numeric hydraulic cylinder of feedback mechanism, the stepper motor part of driving force is mainly included, is capable of achieving to digitize the digital cylinder piston rod of displacement, digitlization can be displaced through the feedback mechanism that ball-screw and the nut connected with its feed back to valve core of the spool valve, the cylinder body for playing a supportive role that can be connected with experiment porch, can realize that displacement is digitized, enhancing functional reliability, realizes structure-integrated purpose.
Described hasIt is newThe Numeric hydraulic cylinder of feedback mechanism, it is characterised in that：Described can digitlization is displaced through ball-screw and the nut connected with its feeds back to the feedback mechanism of valve core of the spool valve and include that the big nut that ball-screw, connector are connected with valve element is constituted, piston linear displacement is converted into the angle of rotation measurement of leading screw first for its work, leading screw drives big nut to rotate by connector, one section of threaded valve element is set to realize straight-line displacement, to control digital cylinder to run.
Described hasIt is newThe Numeric hydraulic cylinder of feedback mechanism, it is characterised in that：The piston rod of described achievable digitlization displacement mainly includes nut that piston rod part and piston rod are connected and screw travel kinematic pair, and the described pitch of ball-screw may be selected suitable ratio with the pitch of valve element threaded one end.
Described hasIt is newThe Numeric hydraulic cylinder of feedback mechanism, it is characterised in that：Described leading screw and the connected connector of big nut is mainly included the disk being connected with cylinder body of limitation big nut axial displacement, the projection and bearing of fixed bearing play stable connection function jointly.
Described hasIt is newThe Numeric hydraulic cylinder of feedback mechanism, it is characterised in that：The shaft coupling that the described stepper motor part for having driving force mainly includes driver, stepper motor and is connected with guiding valve, stepper motor one angle of pulse rotation, the thread pitch of valve element one end and ball-screw and valve element thread pitch ratio of the control determine a step-wise displacement value of digital cylinder；The described cylinder body for playing a supportive role mainly includes cylinder body shell, enters flowline, inside for guiding valve and the space of piston rod activity, and internal chute prevents piston rod from producing rotation, to ensure the precision of machine feedback amount.
The present invention has advantages below and particularity effect：The type of drive of described stepper motor, simple structure is swift in response sensitive, and dynamic response capability is good, being capable of reducing energy consumption, saving energy；It is described can digitlization be displaced through ball-screw and the nut connected with it feeds back to the feedback mechanism of valve core of the spool valve, the reliability of digital cylinder working can be strengthened；The described connector for making ball-screw connected with big nut in feedback arrangement reduces inter-agency friction, overcomes and uses big magnetic coupling feedback mechanism friction, poor reliability and technical requirements shortcoming high, and good operating stability, and control is simple.
Four, are illustrated
Figure 1It is that the present invention hasIt is newThe Numeric hydraulic cylinder of feedback arrangement；
Figure 2It is that the stepper motor part-structure for having driving force in the present invention is illustratedFigure；
Figure 3It is the digital cylinder piston rod construction signal of achievable digitlization displacement in the present inventionFigure；
Figure 4It is that described can digitizing is displaced through ball-screw and the nut connected with it feeds back to the feedback mechanism structural representation of valve core of the spool valveFigure；
Figure 5It is ball-screw is illustrated with the connected connector of big nut in feedback arrangementFigure；
Five, specific embodiments
With reference toAccompanying drawingThe invention will be further described with specific embodiment, but not as a limitation of the invention.
Referring toFigure 1, one kind hasIt is newThe Numeric hydraulic cylinder of feedback mechanism, mainly includes the stepper motor part of driving force, is capable of achieving to digitize the digital cylinder piston rod of displacement, digitlization can be displaced through into the feedback mechanism that ball-screw and the nut connected with its feed back to valve core of the spool valve, the cylinder body for playing a supportive role that can be connected with experiment porch.
Referring toFigure 2The described stepper motor part 1 for having driving force includes stepper assemblies 2.3 and stepper motor outer cover 2.2; Hooks coupling universal coupling 2.1 is fixedly connected; stepper motor outer cover 2.2 plays a part of protection shaft coupling and is connected with stepper motor; Hooks coupling universal coupling is connected with valve core of the spool valve, realizes the transmission of torque.
Referring toFigure 3It is described can digitlization be displaced through ball-screw and the nut connected with it feeds back to the feedback mechanism 2 of valve core of the spool valve, mainly include ball-screw 3.1, the big nut 3.2 being connected with leading screw, valve core of the spool valve 3.3, ball bearing 3.4 and ball bearing 3.5, ball-screw 3.1 is connected with big nut 3.2 by latch, realize the transmission of torque, the rotational angle displacement of big nut 3.2 is converted into the straight-line displacement of valve element 3.3 by screw thread pair, valve core of the spool valve 3.3 is provided with recess, and bearing 3.3 plays a part of radially fixed big nut 3.3 with bearing 3.4, reduces friction.
Referring toFigure 4The digital cylinder piston rod 3 of digitlization displacement is capable of achieving, mainly includes cylinder body drive end bearing bracket 4.1, piston rod 4.2, with the nut 4.3 that leading screw forms feedback, connection member 4.4, drive end bearing bracket 4.1 plays a part of radially fixed piston rod, is provided with hydraulic fluid port, there is the groove of dress sealing ring the end of piston rod 4.2, nut 4.3 is connected with piston rod 4.2, and the straight-line displacement of piston rod is converted into the rotational angle displacement of ball-screw 3.1, and connection member 4.4 is connected by bolts and nuts 4.3.
Can the digitizing of the present embodiment is displaced through the advantage of the feedback mechanism 2 that ball-screw and the nut connected with it feed back to valve core of the spool valve and is, the straight-line displacement of piston rod 4.2 is converted into the angular displacement of ball-screw 3.1 for mechanism, it is then converted to the straight-line displacement of valve element 3.3, simple structure and functional reliability is high.
Referring toFigure 5The described cylinder body 4 for playing a supportive role that can be connected with experiment porch, mainly include cylinder body shell 5.1, end cap 5.2, rear end of the cylinder block lid 5.3, cylinder body shell 5.1 is connected by bolt with end cap 5.2, there is the groove of dress sealing ring on the part of end cap 5.2, rear end cap 5.3 has oil extraction groove, to balance the pressure produced when fluid flows through valve element, rear end cap 5.3 is connected by bolt with stepper motor outer cover 2.2, and cylinder body can be fixed on experiment porch.
The stepper motor part 1 of described driving force, be capable of achieving digitlization displacement digital cylinder piston rod 2, can by digitlization be displaced through the feedback mechanism 3 that ball-screw and the nut connected with its feed back to valve core of the spool valve, the cylinder body 4 for playing a supportive role that can be connected with experiment porch, between connect simple and reliable, specific relative position relation and operation principle are as follows.
In the present embodiment,Stepper motor 2.3 is connected by shaft coupling 2.2 and key with valve core of the spool valve 3.3,Outsides cover of electric machinery 2.2 is outside shaft coupling 2.2,Whenever controller issues 2.3 1 pulses of stepper motor,Stepper motor 2.3 accordingly rotates to an angle with movable valve plug 3.3,Produce opening,The inside oil suction chamber of oil passage cylinder body shell 5.1,Piston 4.2 is set outwards to produce corresponding displacement from drive end bearing bracket 4.1,Pass through connected nut 4.3 simultaneously by Displacement Feedback to ball-screw 3.1,Ball-screw 3.1 is rotated under the support of bearing 3.4 and bearing 3.5,Drive the synchronous rotary of big nut 3.2,Rotational angle displacement is fed back into valve element 3.3,It is that valve element 3.3 is moved to the direction of stepper motor 2.3,When amount of opening is reduced to 0,The stepping course of work in one pulse terminates；Piston 4.2 inwardly produces displacement process similarly from drive end bearing bracket 4.1.
The present embodiment hasIt is newThe advantage of the Numeric hydraulic cylinder of feedback mechanism is：1) can digitlization be displaced through ball-screw and the nut connected with it feeds back to the feedback mechanism simple structure of valve core of the spool valve, easy to control, functional reliability is high；2) digital hydraulic cylinder piston rod realizes digitlization displacement, and displacement can be by change in design；3) structure of this Numeric hydraulic cylinder realizes integration, and simple structure, functional reliability is high, it is adaptable to which complex working condition, engineer applied is strong.
This above case study on implementation only expresses several embodiments of the invention, and its description is more specific and detailed, but therefore can not be interpreted as the limitation to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to protection scope of the present invention.Therefore, the protection domain of patent of the present invention should be determined by the appended claims.
Claims (5)
1. one kind hasIt is newThe Numeric hydraulic cylinder of feedback mechanism, mainly includes the stepper motor part of driving force, is capable of achieving to digitize the digital cylinder piston rod of displacement, digitlization can be displaced through into the feedback mechanism that ball-screw and the nut connected with its feed back to valve core of the spool valve, the cylinder body for playing a supportive role that can be connected with experiment porch.
2.According to claimHaving described in 1It is newThe Numeric hydraulic cylinder of feedback mechanism, it is characterised in that：Described can digitlization is displaced through ball-screw and the nut connected with its feeds back to the feedback mechanism of valve core of the spool valve and include that the big nut that ball-screw, connector are connected with valve element is constituted, piston linear displacement is converted into the angle of rotation measurement of leading screw first for its work, leading screw drives big nut to rotate by connector, one section of threaded valve element is set to realize straight-line displacement, to control digital cylinder to run.
3.According to claimHaving described in 1It is newThe Numeric hydraulic cylinder of feedback mechanism, it is characterised in that：The piston rod of described achievable digitlization displacement mainly includes nut that piston rod part and piston rod are connected and screw travel kinematic pair, and the described pitch of ball-screw may be selected suitable ratio with the pitch of valve element threaded one end.
4.According to claimHaving described in 1It is newThe Numeric hydraulic cylinder of feedback mechanism, it is characterised in that：Described leading screw and the connected connector of big nut is mainly included the disk being connected with cylinder body of limitation big nut axial displacement, the projection and bearing of fixed bearing play stable connection function jointly.
5.According to claimHaving described in 1It is newThe Numeric hydraulic cylinder of feedback mechanism, it is characterised in that：The spline that the described stepper motor part for having driving force mainly includes driver, stepper motor and is connected with guiding valve, stepper motor one angle of pulse rotation, the thread pitch of valve element one end and ball-screw and valve element thread pitch ratio of the control determine a step-wise displacement value of digital cylinder；The described cylinder body for playing a supportive role mainly includes cylinder body shell, enters flowline, inside for guiding valve and the space of piston rod activity, and internal chute prevents piston rod from producing rotation, to ensure the precision of machine feedback amount.
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| CN201510788835.2A CN106704312A (en) | 2015-11-17 | 2015-11-17 | Digital hydraulic cylinder with novel feedback mechanism |
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| CN201510788835.2A CN106704312A (en) | 2015-11-17 | 2015-11-17 | Digital hydraulic cylinder with novel feedback mechanism |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108533561A (en) * | 2018-04-13 | 2018-09-14 | 东北大学 | Internal indirect feedback formula digital hydraulic cylinder structure is driven in a kind of |
| CN108757877A (en) * | 2018-08-23 | 2018-11-06 | 桂林航天工业学院 | Friction pulley flexible mechanical formula feedback device |
| CN110009965A (en) * | 2018-01-05 | 2019-07-12 | 北京航空航天大学 | A kind of six degree of freedom platform based on Numeric hydraulic cylinder |
| CN111043099A (en) * | 2019-11-27 | 2020-04-21 | 北京航空航天大学 | Symmetrical digital hydraulic cylinder |
| CN113898760A (en) * | 2021-10-27 | 2022-01-07 | 哈尔滨工业大学 | Digital reversing valve and control method thereof |
| CN114382744A (en) * | 2022-02-25 | 2022-04-22 | 邵阳先进制造技术研究院有限公司 | Digital hydraulic cylinder applied to textile splitting machine |
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| CN2739394Y (en) * | 2004-06-30 | 2005-11-09 | 贵阳铝镁设计研究院 | Cylinder self-locking device |
| CN1724882A (en) * | 2004-07-22 | 2006-01-25 | 杨世祥 | Two-stage screw internal foodback digital fluid cylinder |
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| CN103148047A (en) * | 2013-03-21 | 2013-06-12 | 肖志权 | Internal feedback digital servo hydraulic cylinder |
| AU2013205450A1 (en) * | 2012-04-28 | 2013-11-14 | Xu, Xuejun Mr | A Position Servo Control Apparatus for Fluid-operated cylinders |
| CN104196820A (en) * | 2014-09-09 | 2014-12-10 | 余理翔 | Energy-saving combined air cylinder |
| CN104930014A (en) * | 2015-06-05 | 2015-09-23 | 上海美西为机电设备有限公司 | Digital servo hydraulic cylinder |
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| CN1251884A (en) * | 1998-10-21 | 2000-05-03 | 杨世祥 | Digital fluid cylinder with self-feedback of torsional helicoid |
| CN2739394Y (en) * | 2004-06-30 | 2005-11-09 | 贵阳铝镁设计研究院 | Cylinder self-locking device |
| CN1724882A (en) * | 2004-07-22 | 2006-01-25 | 杨世祥 | Two-stage screw internal foodback digital fluid cylinder |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110009965A (en) * | 2018-01-05 | 2019-07-12 | 北京航空航天大学 | A kind of six degree of freedom platform based on Numeric hydraulic cylinder |
| CN108533561A (en) * | 2018-04-13 | 2018-09-14 | 东北大学 | Internal indirect feedback formula digital hydraulic cylinder structure is driven in a kind of |
| CN108757877A (en) * | 2018-08-23 | 2018-11-06 | 桂林航天工业学院 | Friction pulley flexible mechanical formula feedback device |
| CN108757877B (en) * | 2018-08-23 | 2023-04-25 | 桂林航天工业学院 | Flexible mechanical feedback device of friction wheel |
| CN111043099A (en) * | 2019-11-27 | 2020-04-21 | 北京航空航天大学 | Symmetrical digital hydraulic cylinder |
| CN113898760A (en) * | 2021-10-27 | 2022-01-07 | 哈尔滨工业大学 | Digital reversing valve and control method thereof |
| CN114382744A (en) * | 2022-02-25 | 2022-04-22 | 邵阳先进制造技术研究院有限公司 | Digital hydraulic cylinder applied to textile splitting machine |
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Application publication date: 20170524 |