CN106224320A - Inbuilt displacement sensor integrated form list rod symmetrical hydraulic cylinder - Google Patents

Inbuilt displacement sensor integrated form list rod symmetrical hydraulic cylinder Download PDF

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Publication number
CN106224320A
CN106224320A CN201610817463.6A CN201610817463A CN106224320A CN 106224320 A CN106224320 A CN 106224320A CN 201610817463 A CN201610817463 A CN 201610817463A CN 106224320 A CN106224320 A CN 106224320A
Authority
CN
China
Prior art keywords
cylinder
lock chamber
piston rod
chamber
displacement sensor
Prior art date
Application number
CN201610817463.6A
Other languages
Chinese (zh)
Inventor
肖聚亮
徐发达
王国栋
洪鹰
Original Assignee
天津大学
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 天津大学 filed Critical 天津大学
Priority to CN201610817463.6A priority Critical patent/CN106224320A/en
Publication of CN106224320A publication Critical patent/CN106224320A/en

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/08Characterised by the construction of the motor unit
    • F15B15/14Characterised by the construction of the motor unit of the straight-cylinder type
    • F15B15/1423Component parts; Constructional details
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/20Other details, e.g. assembly with regulating devices
    • F15B15/28Means for indicating the position, e.g. end of stroke
    • F15B15/2815Position sensing, i.e. means for continuous measurement of position, e.g. LVDT
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2215/00Fluid-actuated devices for displacing a member from one position to another
    • F15B2215/30Constructional details thereof

Abstract

nullThe invention discloses inbuilt displacement sensor integrated form list rod symmetrical hydraulic cylinder,Including a magnetostrictive displacement sensor and a hydraulic cylinder,Hydraulic cylinder includes cylinder body,The main body of sensor is fixed on cylinder bottom by sealing ring,The sidewall of cylinder body right-hand member has air intake,Cylinder bottom has first liquid passage,The sidewall in the left side of cylinder body has second liquid passage,The lock chamber of one tubular is arranged in cylinder body,The piston rod of one hollow is installed between lock chamber outer wall and inboard wall of cylinder block,The right-hand member of lock chamber is fixed on cylinder bottom,Right-hand member at piston rod is provided with boss,Can be slidably matched between outer wall and the inboard wall of cylinder block of boss,Magnet ring lock chamber is installed in lock chamber,The left end of magnet ring lock chamber is fixed on piston end cap,The right-hand member of magnet ring lock chamber is fixed with the magnet ring of sensor,The magnetostrictive bar of sensor is inserted in the hollow cavity of magnet ring lock chamber.This device maintains stablizing during hydraulic cylinder works.

Description

Inbuilt displacement sensor integrated form list rod symmetrical hydraulic cylinder

Technical field

The present invention relates to fluid pressure actuator, especially relate to inbuilt displacement sensor integrated form list rod symmetry liquid Cylinder pressure.

Background technology

Hydraulic cylinder is the executive component that hydraulic energy is converted to linear motion mechanical energy.Symmetrical hydraulic cylinder refers to hydraulic cylinder Two acting surface area equation, and asymmetric servo cylinder is due to the reason of rod chamber piston rod, two active areas are unequal, are Asymmetrical cylinder.The flow difference caused due to area difference in asymmetrical cylinder motor process can affect the controlling of hydraulic cylinder Energy.For pump-contrdled cylinder, directly change the rotating speed of pump and turn to movement velocity and the direction of motion controlling hydraulic cylinder, hydraulic pressure System avoids restriction loss, reduces system heat generation, improves system effectiveness.At present about the research ratio of integrated type hydraulic cylinder Relatively limited, integration degree is relatively low is common problem, how motor, oil pump, valve block, pipeline and hydraulic cylinder to be carried out Reasonably space is arranged is matter of utmost importance;And about the research of symmetrical hydraulic cylinder, maximum has a problem in that and cannot suitably arrange Displacement transducer and the spatial relationship of hydraulic cylinder, in order to ensure the service behaviour of symmetrical hydraulic cylinder, can only be by outside displacement transducer Fix outside being placed in cylinder body or by the magnet ring of displacement transducer.Outside the former makes sensor independent of system, resisting of sensor Interference performance and contamination resistance are affected, and whole system is not truly integrated;Although the latter will sense Device is built-in, but sensor main body is with piston rod associated movement, makes system become complicated heavy.

Summary of the invention

It is an object of the invention to overcome the shortcoming of prior art, it is provided that a kind of inbuilt displacement sensor integrated form list rod Symmetrical hydraulic cylinder, this hydraulic cylinder Highgrade integration, inbuilt displacement sensor, simple in construction, Long travel, hydraulic cylinder two acting surface Effective area is equal, be not required to fuel tank, be applicable to closed circuit.

In order to achieve the above object, the technical solution used in the present invention is:

The inbuilt displacement sensor integrated form list rod symmetrical hydraulic cylinder of the present invention, including a magnetostrictive displacement sensing Device and a hydraulic cylinder, described hydraulic cylinder includes that cylinder body, the main body of described magnetostrictive displacement sensor pass through sealing ring Being fixed on cylinder bottom, described cylinder bottom is fixed on the right-hand member of described cylinder body, has sky on the sidewall of described cylinder body right-hand member Gas entrance, has first liquid passage on described cylinder bottom, has second liquid on the sidewall in the left side of described cylinder body Passage, the lock chamber of a tubular is arranged in cylinder body, is provided with one between described lock chamber outer wall and inboard wall of cylinder block The piston rod of hollow, the right-hand member of described lock chamber is fixed on cylinder bottom and compresses between other end outer wall and piston rod inwall Be provided with sealing ring with seal, the right-hand member at described piston rod is provided with the boss matched with inboard wall of cylinder block shape, described Boss outer wall and inboard wall of cylinder block between can be slidably matched and between the outer wall and inboard wall of cylinder block of described boss press Sealing ring is tightly installed to seal, the left end of described piston rod stretch out the opening on the left of cylinder body outer and be arranged on outside cylinder body Piston end cap be fixedly linked, can be slidably matched between the opening inwall on the left of the left end of described piston rod and described cylinder body And between opening inwall and the outer wall of piston rod on the left of described cylinder body compress be provided with sealing ring with seal, described Lock chamber in magnet ring lock chamber is installed, the left end of described magnet ring lock chamber is fixed on piston end cap, at described magnetic The magnet ring of magnetostrictive displacement sensor, the mangneto of described magnetostrictive displacement sensor it is fixed with on the right-hand member of ring lock chamber Expansion link is inserted in the hollow cavity of magnet ring lock chamber, the holding wire of described magnetostrictive displacement sensor and control system phase Even the displacement signal of digital quantity is exported to control system, structure between described cylinder bottom, lock chamber, piston rod and piston end cap Becoming the first chamber, the first described chamber to be connected with first liquid passage, the liquid in the first chamber described in inflow is being lived Squeezing action face on plug end cap is the first acting surface, constitutes the second chamber between described piston rod and cylinder body, described the Two fluid passages are connected with the second described chamber, the squeezing action on boss of the liquid in the second chamber described in inflow Face is the second acting surface, constitutes air cavity between described cylinder bottom, cylinder body, lock chamber and piston rod, and described air cavity passes through air Entrance is connected with air, and the first described acting surface and the area equation of the second acting surface, described cylinder body length, lock chamber are long The length of degree and piston rod reduces successively, and the length of described piston rod is less than the length of lock chamber, and described magnet ring is fixed The length in chamber is less than the length of piston rod.

The present invention compared with prior art, has the beneficial effect that and combines symmetrical hydraulic cylinder and asymmetric servo cylinder Plurality of advantages, solves in motor process the piston rod both sides work area problem such as not, it is ensured that pass in and out oil mass during hydraulic cylinder Equal, thus stablizing during maintaining hydraulic cylinder works, well solve the contradiction of hydraulic cylinder flow and stability;By magnetic Cause telescopic displacement sensor and be built in inside hydraulic cylinder, enhance the capacity of resisting disturbance of sensor, it is achieved that element integrated.This Structure have Long travel, single rod, hydraulic cylinder two acting surface effective area is equal, inbuilt displacement sensor, maintenance more Easily, it is applicable to the features such as closed circuit, can be widely applied in hydraulic system.

Accompanying drawing explanation

Fig. 1 is the front view of the inbuilt displacement sensor integrated form list rod symmetrical hydraulic cylinder of the present invention.

Detailed description of the invention

The present invention will be further described with specific embodiment below in conjunction with the accompanying drawings.Following each embodiment is merely to illustrate this Invention and not limitation of the present invention.

As shown in drawings, inbuilt displacement sensor integrated form list rod symmetrical hydraulic cylinder of the present invention, stretch including a mangneto Condense displacement sensor and a hydraulic cylinder, and described hydraulic cylinder includes cylinder body 2, the master of described magnetostrictive displacement sensor 8 Body is fixed on cylinder bottom 1 by sealing ring 10.

Described cylinder bottom 1 is fixed on the right-hand member of described cylinder body 2, has air on the sidewall of described cylinder body 2 right-hand member Entrance T, has first liquid passage A on described cylinder bottom 1, has the second liquid on the sidewall in the left side of described cylinder body 2 Body passage B, the lock chamber 5 of a tubular is arranged in cylinder body 2, installs between described lock chamber 5 outer wall and cylinder body 2 inwall The piston rod 6 of a hollow, the right-hand member of described lock chamber 5 is had to be fixed on cylinder bottom 1 and in other end outer wall and piston rod 6 Between wall compress be provided with sealing ring with seal, the right-hand member at described piston rod 6 is provided with and matches with cylinder body 2 inner wall shape Boss, can be slidably matched between outer wall and cylinder body 2 inwall of described boss and at the outer wall of described boss and cylinder Compressing between body 2 inwall and be provided with sealing ring to seal, the left end of described piston rod 6 stretches out outside the opening on the left of cylinder body 2 also And be fixedly linked with the piston end cap 7 being arranged on outside cylinder body 2, opening on the left of the left end of described piston rod 6 and described cylinder body Can be slidably matched between mouthful inwall and compress between opening inwall and the outer wall of piston rod 6 on the left of described cylinder body and install Having sealing ring to seal, be provided with magnet ring lock chamber 4 in described lock chamber 5, the left end of described magnet ring lock chamber 4 is fixed On piston end cap 7, the right-hand member of described magnet ring lock chamber 4 is fixed with the magnet ring 3 of magnetostrictive displacement sensor 8.Institute The magnetostrictive bar of the magnetostrictive displacement sensor 8 stated is inserted in the hollow cavity of magnet ring lock chamber 4, described magnetostriction The holding wire of displacement transducer is connected with control system to export the displacement signal of digital quantity to control system.In figure, 9 is magnetic Cause the housing of telescopic displacement sensor 8, be fixed on cylinder bottom.

The first chamber a, the first described chamber is constituted between described cylinder bottom 1, lock chamber 5, piston rod 6 and piston end cap 7 Room a is connected with first liquid passage A, and the first described chamber indoor liquid, through fluid passage A and outside oil communication, flows into institute The liquid in the first chamber a stated squeezing action face on piston end cap 7 is the first acting surface I;Piston rod 6 and cylinder body 2 it Between constitute the second chamber b, described second liquid passage B and be connected with the second described chamber b, liquid warp in the second chamber b Fluid passage B and outside oil communication, the squeezing action face on boss of the liquid in the second chamber b described in inflow is second Acting surface II;Between cylinder bottom 1, cylinder body 2, lock chamber 5 and piston rod 6 constitute air cavity t, described air cavity t by air intake T with Air is connected.The first described acting surface I and area equation of the second acting surface II.

The length of described cylinder body 2 length, lock chamber 5 length and piston rod 6 reduces successively, and the length of piston rod 6 needs Being less than the length of lock chamber 5, during to ensure that piston rod 6 is fully retracted, the boss rightmost side of piston rod 6 is positioned at air intake T Left side.In like manner, the length of described magnet ring lock chamber 4 is also required to the length less than piston rod 6, complete to ensure piston rod 6 When stretching out, it is ensured that in the case of magnetostrictive displacement sensor 8 normally works, the boss leftmost side of piston rod 6 is positioned at the second liquid The right side of body passage B.

The magnet ring 3 of magnetostrictive displacement sensor connects firmly with magnet ring lock chamber 4 bolt, thus ensures that piston rod 6 is moved through Cheng Zhong, the magnetostrictive bar position of magnetostrictive displacement sensor fixes, and magnet ring 3 crosses that magnet ring lock chamber 4 is Tong Bu with piston rod 6 to be transported Dynamic.Preferably the resolution of magnetostrictive displacement sensor is 0.001mm, exhausted with 25 Gray code digital output piston rods To position.The absolute position values of described magnetostrictive displacement sensor output piston bar, it is also possible to the speed of output piston bar, Reliability is good, and stability is strong;Metering system is contactless, it is not necessary to consider the interference factors such as friction, abrasion;There is not signal The measurement error such as drift, do not affect data receiver under powering-off state.

Operation principle of the present invention is as follows:

Hydraulic cylinder has and only an actuating rod, i.e. piston rod 6, and two acting surfaces of hydraulic cylinder are respectively the first acting surface I and second acting surface II, appropriate design cylinder diameter so that the area equation of two acting surfaces, to realize the control of asymmetric cylinder Performance.Lock chamber 5 diameter will not directly affect hydraulic cylinder active area, therefore, and can be by straight for lock chamber 5 in design process Footpath suitably increases, and has the most both ensured the stability of hydraulic cylinder, and will not improve again flow required during hydraulic cylinder works.

During work, air intake T leads to air, and during piston rod 6 stretches out, first liquid passage A oil-feed, through cylinder bottom 1 oil Road flows into the first chamber a, acts on the first acting surface I, and to promote piston rod 6 to stretch out, passage B is fuel-displaced for second liquid, and second The hydraulic oil of chamber b second liquid passage B on cylinder body 2 flows out;During piston rod 6 is regained, second liquid passage B oil-feed, Hydraulic oil second liquid passage B on cylinder body 2 enters the second chamber b, acts on and promotes piston rod 6 to regain on face II, the first liquid Passage A is fuel-displaced for body, and the hydraulic oil of the first chamber a, through cylinder bottom 1 oil circuit, is discharged from first liquid passage A.

The magnetostrictive bar of the built-in magnetostrictive displacement sensor of hydraulic cylinder 8, be arranged on cylinder bottom 1, the piston rod 6 of hollow, Lock chamber 5 and the inside of magnet ring lock chamber 4, compact conformation.During hydraulic cylinder works, magnetostrictive displacement sensor 8 Magnet ring 3 connects firmly on the piston rod, is synchronized with the movement with piston rod 6, and the main body of magnetostrictive displacement sensor 8 is solid by sealing ring 13 It is scheduled on cylinder bottom 1, the displacement of real-time accurate feedback piston rod 6.

Claims (2)

1. inbuilt displacement sensor integrated form list rod symmetrical hydraulic cylinder, it is characterised in that: include that a magnetostrictive displacement passes Sensor and a hydraulic cylinder, described hydraulic cylinder includes cylinder body, and the main body of described magnetostrictive displacement sensor is by sealing Ring is fixed on cylinder bottom, and described cylinder bottom is fixed on the right-hand member of described cylinder body, has on the sidewall of described cylinder body right-hand member Air intake, has first liquid passage on described cylinder bottom, has the second liquid on the sidewall in the left side of described cylinder body Body passage, the lock chamber of a tubular is arranged in cylinder body, is provided with one between described lock chamber outer wall and inboard wall of cylinder block The piston rod of individual hollow, the right-hand member of described lock chamber is fixed on cylinder bottom and presses between other end outer wall and piston rod inwall Tightly be provided with sealing ring with seal, the right-hand member at described piston rod is provided with the boss matched with inboard wall of cylinder block shape, institute Can be slidably matched between outer wall and the inboard wall of cylinder block of the boss stated and between the outer wall and inboard wall of cylinder block of described boss Compression is provided with sealing ring to seal, the left end of described piston rod stretch out the opening on the left of cylinder body outer and be arranged on cylinder body Outer piston end cap is fixedly linked, and can slide and join between the opening inwall on the left of the left end of described piston rod and described cylinder body Merge and compress between opening inwall and the outer wall of piston rod on the left of described cylinder body and sealing ring is installed to seal, in institute Being provided with magnet ring lock chamber in the lock chamber stated, the left end of described magnet ring lock chamber is fixed on piston end cap, described The magnet ring of magnetostrictive displacement sensor, the magnetic of described magnetostrictive displacement sensor it is fixed with on the right-hand member of magnet ring lock chamber Cause expansion link to be inserted in the hollow cavity of magnet ring lock chamber, the holding wire of described magnetostrictive displacement sensor and control system It is connected the displacement signal of digital quantity is exported to control system, between described cylinder bottom, lock chamber, piston rod and piston end cap Constituting the first chamber, the first described chamber is connected with first liquid passage, and the liquid in the first chamber described in inflow exists Squeezing action face on piston end cap is the first acting surface, constitutes the second chamber between described piston rod and cylinder body, described Second liquid passage is connected with the second described chamber, and the extruding on boss of the liquid in the second chamber described in inflow is made Being the second acting surface with face, constitute air cavity between described cylinder bottom, cylinder body, lock chamber and piston rod, described air cavity is by sky Gas entrance and air are connected, the first described acting surface and the area equation of the second acting surface, described cylinder body length, lock chamber The length of length and piston rod reduces successively, and the length of described piston rod is less than the length of lock chamber, and described magnet ring is solid Determine the length length less than piston rod in chamber.
Inbuilt displacement sensor integrated form list rod symmetrical hydraulic cylinder the most according to claim 1, it is characterised in that: described The resolution of magnetostrictive displacement sensor be 0.001mm, with the absolute position of 25 Gray code digital output piston rods.
CN201610817463.6A 2016-09-12 2016-09-12 Inbuilt displacement sensor integrated form list rod symmetrical hydraulic cylinder CN106224320A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106939910A (en) * 2017-04-22 2017-07-11 新乡市新倍增自动化设备有限公司 A kind of Electrical hydrostatic actuator single rod symmetrical hydraulic cylinder at a high speed
CN108223488A (en) * 2016-12-21 2018-06-29 精工电子有限公司 Fluid pressure cylinder
CN109058219A (en) * 2018-08-30 2018-12-21 哈尔滨工业大学 A kind of built-in sensors formula hydraulic cylinder device
CN110307207A (en) * 2019-06-25 2019-10-08 同济大学 A kind of hydraulic cylinder displacement sensor cooling flow control device

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3949650A (en) * 1975-01-16 1976-04-13 Blatt Leland F Equal area displacement hydraulic cylinder
CN2539019Y (en) * 2002-04-26 2003-03-05 无锡市长江液压缸厂 High-pressure heavy hydraulic cylinder with linear displacement sensor
CN1546873A (en) * 2003-11-29 2004-11-17 浙江大学 Single rod double acting symmetrical hydraulic cylinder with built-in displacement sensor
CN1584350A (en) * 2004-06-04 2005-02-23 浙江大学 Single rod and rough symmetric double actuating surfaces hydraulic cylinder with internal displacement sensor
CN2903517Y (en) * 2006-04-28 2007-05-23 韶关液压件厂有限公司 Unconventional hydraulic cylinder displacement sensor
CN101089406A (en) * 2006-06-16 2007-12-19 萱场工业株式会社 Fluid pressure cylinder unit with stroke sensor
CN101243259A (en) * 2005-09-09 2008-08-13 萱场工业株式会社 Cylinder device
CN201714733U (en) * 2010-06-25 2011-01-19 格力乐液压系统(常州)有限公司 Servo hydraulic oil cylinder
CN103016447A (en) * 2013-01-15 2013-04-03 无锡市三信传动控制有限公司 Constant-pressure and constant-force hydraulic servo cylinder with single outlet rod
CN103775441A (en) * 2014-01-26 2014-05-07 天津大学 Electrical feedback large-scale servo hydraulic cylinder driven by double motors
CN104047912A (en) * 2014-06-25 2014-09-17 天津大学 Digital pump control differential motion hydraulic cylinder with power source

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3949650A (en) * 1975-01-16 1976-04-13 Blatt Leland F Equal area displacement hydraulic cylinder
CN2539019Y (en) * 2002-04-26 2003-03-05 无锡市长江液压缸厂 High-pressure heavy hydraulic cylinder with linear displacement sensor
CN1546873A (en) * 2003-11-29 2004-11-17 浙江大学 Single rod double acting symmetrical hydraulic cylinder with built-in displacement sensor
CN1584350A (en) * 2004-06-04 2005-02-23 浙江大学 Single rod and rough symmetric double actuating surfaces hydraulic cylinder with internal displacement sensor
CN101243259A (en) * 2005-09-09 2008-08-13 萱场工业株式会社 Cylinder device
CN2903517Y (en) * 2006-04-28 2007-05-23 韶关液压件厂有限公司 Unconventional hydraulic cylinder displacement sensor
CN101089406A (en) * 2006-06-16 2007-12-19 萱场工业株式会社 Fluid pressure cylinder unit with stroke sensor
CN201714733U (en) * 2010-06-25 2011-01-19 格力乐液压系统(常州)有限公司 Servo hydraulic oil cylinder
CN103016447A (en) * 2013-01-15 2013-04-03 无锡市三信传动控制有限公司 Constant-pressure and constant-force hydraulic servo cylinder with single outlet rod
CN103775441A (en) * 2014-01-26 2014-05-07 天津大学 Electrical feedback large-scale servo hydraulic cylinder driven by double motors
CN104047912A (en) * 2014-06-25 2014-09-17 天津大学 Digital pump control differential motion hydraulic cylinder with power source

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108223488A (en) * 2016-12-21 2018-06-29 精工电子有限公司 Fluid pressure cylinder
CN108223488B (en) * 2016-12-21 2020-09-18 精工电子有限公司 Fluid pressure cylinder
CN106939910A (en) * 2017-04-22 2017-07-11 新乡市新倍增自动化设备有限公司 A kind of Electrical hydrostatic actuator single rod symmetrical hydraulic cylinder at a high speed
CN109058219A (en) * 2018-08-30 2018-12-21 哈尔滨工业大学 A kind of built-in sensors formula hydraulic cylinder device
CN110307207A (en) * 2019-06-25 2019-10-08 同济大学 A kind of hydraulic cylinder displacement sensor cooling flow control device
CN110307207B (en) * 2019-06-25 2020-07-07 同济大学 Cooling flow control device of hydraulic cylinder displacement sensor

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