CN108895060A - A kind of built-in stroke measurment hydraulic cylinder - Google Patents
A kind of built-in stroke measurment hydraulic cylinder Download PDFInfo
- Publication number
- CN108895060A CN108895060A CN201811049415.2A CN201811049415A CN108895060A CN 108895060 A CN108895060 A CN 108895060A CN 201811049415 A CN201811049415 A CN 201811049415A CN 108895060 A CN108895060 A CN 108895060A
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- Prior art keywords
- cylinder
- bracing wire
- piston
- piston rod
- encoder
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- Legal status (The legal status 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 status listed.)
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- 239000000446 fuel Substances 0.000 claims abstract description 11
- 238000007789 sealing Methods 0.000 claims description 19
- 230000003068 static effect Effects 0.000 claims description 9
- 238000009434 installation Methods 0.000 abstract description 8
- 238000006073 displacement reaction Methods 0.000 description 12
- 239000010720 hydraulic oil Substances 0.000 description 12
- 238000005259 measurement Methods 0.000 description 5
- 239000007788 liquid Substances 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000003921 oil Substances 0.000 description 2
- 210000001367 artery Anatomy 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 210000003462 vein Anatomy 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/20—Other details, e.g. assembly with regulating devices
- F15B15/28—Means for indicating the position, e.g. end of stroke
- F15B15/2815—Position sensing, i.e. means for continuous measurement of position, e.g. LVDT
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/20—Other details, e.g. assembly with regulating devices
- F15B15/28—Means for indicating the position, e.g. end of stroke
- F15B15/2892—Means for indicating the position, e.g. end of stroke characterised by the attachment means
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Actuator (AREA)
Abstract
The present invention relates to a kind of built-in stroke measurment hydraulic cylinders, it is characterized in that it includes draw wire encoder, encoder bracket, cylinder bottom, cylinder barrel, bracing wire pillar, piston, piston rod, cylinder cap, bracing wire fixed pin and plug screw；Cylinder bottom and cylinder cap are separately positioned on cylinder barrel both ends, and piston is arranged in cylinder barrel；A bracing wire through-hole is equipped in piston rod, piston rod front end is fixedly connected with the piston；One is equipped on cylinder bottom without bar fuel feed hole, being equipped with one on cylinder cap has bar fuel feed hole；Bracing wire pillar one end is extend into the bracing wire through-hole of piston rod, encoder bracket is fixedly mounted on cylinder bottom, draw wire encoder is arranged on encoder bracket, and the bracing wire of draw wire encoder is stuck in the end face of piston rod rear end with bracing wire fixed pin after extending into the bracing wire through-hole of piston rod by bracing wire pillar and is fixed at piston rod rear end by plug screw.The present invention has the advantages that required installation space is small, easy to maintain and cost performance is good.
Description
Technical field
The present invention relates to a kind of hydraulic cylinder more particularly to a kind of built-in stroke measurment hydraulic cylinders.
Background technique
In recent years, with the extensive use of hydraulic technique, the purposes of hydraulic cylinder is more and more wider.Some high-end servos,
The hydraulic cylinder used on proportional hydraulic system, it usually needs measure the movement travel of hydraulic cylinder, active control liquid is accomplished with this
The purpose of cylinder pressure movement.
The stroke of hydraulic cylinder generallys use displacement sensor to measure.According to displacement sensor mounting means not
Together, external and two kinds built-in can be divided into.External displacement sensor is installed outside hydraulic cylinder, is usually fixed in parallel
The side of hydraulic cylinder, measurement moving component are connect with hydraulic cylinder piston rod exposed parts.The movement of hydraulic cylinder piston rod drives
The moving component of displacement sensor acts, to measure the stroke of piston rod.External displacement sensor includes straight line current potential
Device, differential transformer, inductosyn, linear grating etc..External displacement sensor has price low, convenient for installation and maintenance
Advantage is easily damaged the disadvantage is that precision is low, installation space is big.It is different from external displacement sensor, built-in displacement sensor
It is typically secured on the cylinder bottom of hydraulic cylinder, moving component is built in inside hydraulic cylinder, therefore installation space is smaller；Due to its fortune
Dynamic component is built in hydraulic cylinder, and non-contact with hydraulic cylinder, so being hardly damaged.Built-in displacement sensor is mainly exactly magnetic
Cause telescopic displacement sensor, the measurement accuracy height of this magnetostrictive displacement sensor, good reliability, long service life.Mangneto
The shortcomings that telescopic displacement sensor is exactly that price is higher, and cost performance is bad.
Currently, also there is the report using draw wire encoder measurement hydraulic cylinder travel in published data.Since bracing wire is compiled
Code device measurement accuracy is high, and price is low, so its good cost performance.It but in report, is fixed using external mounting means
Draw wire encoder.Usually draw wire encoder is fixed on outside hydraulic cylinder on the bracket on side, the bracing wire of encoder is fixed on liquid
The exsertion part of pressure cylinder piston bar, due to being external installation, the bracing wire of encoder is exposed in ambient enviroment, easily damages,
The draw wire encoder of damage gently then causes stroke measurment accuracy decline, and it will cause equipment, personal safety accident for weight.
Summary of the invention
For disadvantage mentioned above, the purpose of the present invention is to provide a kind of built-in stroke measurment hydraulic cylinder, required installation
Space is small, easy to maintain and cost performance is good.
Technology contents of the invention are a kind of built-in stroke measurment hydraulic cylinder, it is characterized in that it include draw wire encoder,
Encoder bracket, cylinder bottom, cylinder barrel, bracing wire pillar, piston, piston rod, cylinder cap, bracing wire fixed pin and plug screw；
Cylinder bottom is fixed at one end of cylinder barrel, and the other end of cylinder barrel is arranged in cylinder cap, and piston is arranged in cylinder barrel；In piston rod
In be equipped with a bracing wire through-hole, piston rod front end passes through cylinder cap and protrudes into cylinder barrel and be fixedly connected with the piston；Piston is by cylinder barrel internal cavity
Be divided into rod chamber and rodless cavity, be equipped on cylinder bottom one be connected to rodless cavity without bar fuel feed hole, on cylinder cap equipped with one and
Rod chamber connection has bar fuel feed hole；Bracing wire pillar one end sequentially passes through cylinder bottom and piston extend into the bracing wire through-hole of piston rod
In, encoder bracket is fixedly mounted on cylinder bottom corresponding with the bracing wire pillar other end, and draw wire encoder is arranged in encoder branch
On frame, the bracing wire of draw wire encoder with bracing wire fixed pin is stuck in work after extending into the bracing wire through-hole of piston rod by bracing wire pillar
The end face of stopper rod rear end is simultaneously fixed at piston rod rear end by plug screw.
For convenience of fixed bracing wire pillar, a kind of above-mentioned built-in stroke measurment hydraulic cylinder further includes card key, and bracing wire pillar is logical
It crosses card key to be fixed on cylinder bottom, card key is pressed in the counterbore of cylinder bottom by encoder bracket simultaneously, prevents card key and bracing wire pillar
Axial float；For the leakproofness for improving hydraulic cylinder, piston rod seals are equipped between cylinder cap and piston rod, in cylinder cap and cylinder barrel
Between be equipped with cylinder cap sealing ring, between piston and piston rod be equipped with piston static sealing ring, between piston and cylinder barrel be equipped with live
Dynamic seal ring is filled in, pillar dynamic seal ring is equipped between piston and bracing wire pillar, cylinder bottom is equipped between cylinder bottom and cylinder barrel and is sealed
Circle is equipped with pillar static sealing ring between cylinder bottom and bracing wire pillar.
Piston dynamic seal ring is used to seal gap between cylinder barrel and piston, prevent hydraulic oil rod chamber and without bar it is strong it
Between leak mutually.Piston static sealing ring is used to the gap between sealing piston and piston rod, prevents hydraulic oil from letting out between gap
Leakage.Cylinder bottom is fixed on cylinder barrel using one group of cylinder bottom screw, and cylinder bottom sealing ring prevents seam of the hydraulic oil between cylinder bottom and cylinder barrel
Gap leakage.Cylinder cap also uses one group of cylinder cover screw to be fixed on cylinder barrel, cylinder cap sealing ring prevent hydraulic oil from cylinder cap and cylinder barrel it
Between slot leakage.When piston rod seals are used to prevent piston rod movement, gap of the hydraulic oil between piston rod and cylinder cap
Middle leakage.Bracing wire pillar is fixed on cylinder bottom center using card key, and pillar static sealing ring prevents hydraulic oil from cylinder bottom and bracing wire pillar
Between gap in leak.When pillar dynamic seal ring is used to prevent piston motion, hydraulic oil is between piston and bracing wire pillar
It is leaked in gap.Encoder bracket is fixed on cylinder bottom using a pack support screw, while card key being pressed on to the counterbore of cylinder bottom
It is interior, prevent card key and bracing wire pillar axial float.Draw wire encoder is fixed on encoder bracket using encoder screw.Bracing wire
Then the center for being drawstring through bracing wire pillar on encoder is stuck in the counterbore of piston rod end face using bracing wire fixed pin, and
It is fixed using plug screw.
The change in location of hydraulic cylinder piston bar assembly is detected by draw wire encoder.The arteries and veins of draw wire encoder output
The host computers such as signal supply digital instrument, programmable controller, computer are rushed, the motion bit of hydraulic cylinder piston rod can be calculated
It sets, the direction of motion and movement velocity.
The bracing wire of draw wire encoder is built in inside hydraulic cylinder, has structure simple, and protection is reliable, non-damageable spy
Point.
The bracing wire of draw wire encoder is protected using bracing wire pillar, can prevent the high pressure oil inside hydraulic cylinder from damaging coding
The bracing wire of device.
Piston rod is hollow structure, the convenient bracing wire in piston rod end regular coding device, while also bracing wire being facilitated to encode
The maintenance and replacement of device.
The card key of fixed bracing wire pillar is two halves structure, is easily installed in the outer circle card slot of bracing wire pillar.
Possessed advantage is the present invention compared with prior art：The present invention is using draw wire encoder as stroke measurment
Sensor has the characteristics that measurement accuracy is high, cost performance is good, simultaneously because the bracing wire of draw wire encoder is built in hydraulic cylinder
Portion protects it preferably, is hardly damaged；So the present invention also has installation space compact, convenient for installation and maintenance, it is not easy
The advantages of damage, long service life.
Detailed description of the invention
Fig. 1 is the structural diagram of the present invention.
Specific embodiment
As shown in Figure 1, a kind of built-in stroke measurment hydraulic cylinder, it is characterized in that its draw wire encoder 1, encoder bracket 2,
Card key 3, cylinder bottom 4, cylinder barrel 5, bracing wire pillar 6, piston 7, piston rod 8, cylinder cap 9, bracing wire fixed pin 10, plug screw 11, cylinder cover screw
12, piston rod seals 13, cylinder cap sealing ring 14, piston static sealing ring 15, piston dynamic seal ring 16, pillar dynamic seal ring 17,
Cylinder bottom sealing ring 18, pillar static sealing ring 19, cylinder bottom screw 20, bracket screw 21, encoder screw 22；
Cylinder bottom 4 is fixed on one end of cylinder barrel 5 with one group of cylinder bottom screw 20, and cylinder cap 9 is fixed on cylinder barrel 5 with one group of cylinder cover screw 12
The other end, piston 7 are arranged in cylinder barrel 5；A bracing wire through-hole 8.1 is equipped in piston rod 8,8 front end of piston rod passes through cylinder cap 9 and stretches
Enter and is fixedly connected in cylinder barrel 5 with piston 7；5 internal cavity of cylinder barrel is divided into rod chamber 5.1 and rodless cavity 5.2 by piston 7, in cylinder bottom 4
Be equipped with one be connected to rodless cavity 5.2 without bar fuel feed hole 4.1, on cylinder cap 9 equipped with one be connected to rod chamber 5.1 have bar into
Oilhole 9.1；The card key 3 of bracing wire pillar 6 is fixed on 4 center of cylinder bottom, and 6 one end of bracing wire pillar sequentially passes through cylinder bottom 4 and piston 7 protrudes into
Into the bracing wire through-hole 8.1 of piston rod 8, the pack support screw 21 of encoder bracket 2 is fixedly mounted on another with bracing wire pillar 6
It holds on corresponding cylinder bottom 4, while card key 3 being pressed in the counterbore of cylinder bottom 4, prevents 6 axial float of card key 3 and bracing wire pillar,
Draw wire encoder 1 is fixed on encoder bracket 2 with encoder screw 22, and the bracing wire 1.1 of draw wire encoder 1 passes through bracing wire
Pillar 6 with bracing wire fixed pin 10 is stuck in the end face of 8 rear end of piston rod after extending into the bracing wire through-hole 8.1 of piston rod 8 and by spiral shell
Plug 11 is fixed at 8 rear end of piston rod.
It is equipped with piston rod seals 13 between cylinder cap 9 and piston rod 8, cylinder cap is equipped between cylinder cap 9 and cylinder barrel 5 and is sealed
Circle 14 is equipped with piston static sealing ring 15 between piston 7 and piston rod 8, and piston dynamic sealing is equipped between piston 7 and cylinder barrel 5
Circle 16 is equipped with pillar dynamic seal ring 17 between piston 7 and bracing wire pillar 6, and cylinder bottom is equipped between cylinder bottom 4 and cylinder barrel 5 and is sealed
Circle 18 is equipped with pillar static sealing ring 19 between cylinder bottom 4 and bracing wire pillar 6.
The operation principle of the present invention is that the bracing wire 1.1 of draw wire encoder 1 passes through the center of bracing wire pillar 6 and piston rod 8,
It is stuck in using bracing wire fixed pin 10 in the counterbore of 8 end face of piston rod, and fixed using plug screw 11.When hydraulic cylinder works, piston rod 8
Movement drive bracing wire 1.1 stretch, flexible 1 output pulse signal of drive draw wire encoder of bracing wire 1.1.Pulse signal supplies
To host computers such as digital instrument, programmable controller, computers, upper computer detection goes out the quantity, polarity and frequency of pulse
Calculate movement position, the direction of motion and the movement velocity of hydraulic cylinder piston rod 8.
Specific work process is：When hydraulic cylinder piston rod stretches out, hydraulic oil, liquid are fed without bar fuel feed hole 4.1 on cylinder bottom 4
Pressure oil enters rodless cavity 5.2, and 7 piston rod of piston, 8 component is pushed to move right, and the hydraulic oil of 5.1 chamber of rod chamber passes through on cylinder cap 9
Have bar fuel feed hole 9.1 discharge；Piston rod 8 move right drive bracing wire 1.1 extend, draw wire encoder 1 export certain amount and
The positive pulse of frequency, host computer is by comparing pulse signal, it is possible to determine that going out hydraulic cylinder piston rod is stretch out motion, is calculated simultaneously
Extended position and stretching speed out；When hydraulic cylinder piston rod retracts, there is bar fuel feed hole 9.1 to feed hydraulic oil on cylinder cap 9, it is hydraulic
Oil enters rod chamber 5.1, and 7 piston rod of piston, 8 component is pushed to move downward, and the hydraulic oil of rodless cavity 5.2 passes through the nothing on cylinder bottom 4
Bar fuel feed hole 4.1 is discharged；Piston rod 8, which moves downward, drives bracing wire 1.1 to shorten, and draw wire encoder 1 exports certain amount and frequency
Negative pulse, host computer is by comparing pulse signal, it is possible to determine that going out hydraulic cylinder piston rod is retraction movement, while calculating contracting
Return is set and retraction speed.
Claims (3)
1. a kind of built-in stroke measurment hydraulic cylinder, it is characterized in that it include draw wire encoder, encoder bracket, cylinder bottom, cylinder barrel,
Bracing wire pillar, piston, piston rod, cylinder cap, bracing wire fixed pin and plug screw；
Cylinder bottom is fixed at one end of cylinder barrel, and the other end of cylinder barrel is arranged in cylinder cap, and piston is arranged in cylinder barrel；In piston rod
In be equipped with a bracing wire through-hole, piston rod front end passes through cylinder cap and protrudes into cylinder barrel and be fixedly connected with the piston；Piston is by cylinder barrel internal cavity
Be divided into rod chamber and rodless cavity, be equipped on cylinder bottom one be connected to rodless cavity without bar fuel feed hole, on cylinder cap equipped with one and
Rod chamber connection has bar fuel feed hole；Bracing wire pillar one end sequentially passes through cylinder bottom and piston extend into the bracing wire through-hole of piston rod
In, encoder bracket is fixedly mounted on cylinder bottom corresponding with the bracing wire pillar other end, and draw wire encoder is arranged in encoder branch
On frame, the bracing wire of draw wire encoder with bracing wire fixed pin is stuck in work after extending into the bracing wire through-hole of piston rod by bracing wire pillar
The end face of stopper rod rear end is simultaneously fixed at piston rod rear end by plug screw.
2. a kind of built-in stroke measurment hydraulic cylinder according to claim 1, it is characterized in that it further includes card key, bracing wire shield
Pipe is fixed on cylinder bottom by card key, and card key is pressed in the counterbore of cylinder bottom by encoder bracket simultaneously, prevents card key and bracing wire
Pillar axial float.
3. a kind of built-in stroke measurment hydraulic cylinder according to claim 1, it is characterized in that between cylinder cap and piston rod
Equipped with piston rod seals, it is equipped with cylinder cap sealing ring between cylinder cap and cylinder barrel, it is quiet that piston is equipped between piston and piston rod
Sealing ring is equipped with piston dynamic seal ring between piston and cylinder barrel, and pillar dynamic seal ring is equipped between piston and bracing wire pillar,
It is equipped with cylinder bottom sealing ring between cylinder bottom and cylinder barrel, pillar static sealing ring is equipped between cylinder bottom and bracing wire pillar.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811049415.2A CN108895060A (en) | 2018-09-10 | 2018-09-10 | A kind of built-in stroke measurment hydraulic cylinder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811049415.2A CN108895060A (en) | 2018-09-10 | 2018-09-10 | A kind of built-in stroke measurment hydraulic cylinder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108895060A true CN108895060A (en) | 2018-11-27 |
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ID=64359304
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811049415.2A Pending CN108895060A (en) | 2018-09-10 | 2018-09-10 | A kind of built-in stroke measurment hydraulic cylinder |
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| Country | Link |
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| CN (1) | CN108895060A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111608609A (en) * | 2020-04-21 | 2020-09-01 | 中国海洋石油集团有限公司 | Double-medium hydraulic injection cylinder |
| CN112503056A (en) * | 2020-11-17 | 2021-03-16 | 中联重科股份有限公司 | Oil cylinder, multi-oil-cylinder synchronous control system, control method and crane |
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| CN202092604U (en) * | 2011-05-21 | 2011-12-28 | 三一重工股份有限公司 | Stay wire sensor and engineering machinery |
| WO2012151708A1 (en) * | 2011-05-09 | 2012-11-15 | Mueller Peter A | Operating cylinder sensor |
| CN203394928U (en) * | 2013-08-08 | 2014-01-15 | 中联重科股份有限公司 | Hydraulic cylinder with stroke measuring and controlling device and engineering machine including hydraulic cylinder |
| CN203514270U (en) * | 2013-10-10 | 2014-04-02 | 安徽省六安恒源机械有限公司 | Internally-mounted sensor mounting mechanism of reverse hanging type hydraulic headstock gear |
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| CN205956117U (en) * | 2016-01-13 | 2017-02-15 | 中南大学 | Let out leakage quantity measuring device in arbitrary stroke position of pneumatic cylinder is small |
| CN108386416A (en) * | 2018-05-25 | 2018-08-10 | 江苏理工学院 | A kind of displacement sensor fixing device suitable for a variety of hydraulic cylinder specifications |
| CN208651326U (en) * | 2018-09-10 | 2019-03-26 | 江阴市洪腾机械有限公司 | A kind of built-in stroke measurment hydraulic cylinder |
-
2018
- 2018-09-10 CN CN201811049415.2A patent/CN108895060A/en active Pending
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|---|---|---|---|---|
| DE3744085A1 (en) * | 1987-12-24 | 1989-07-06 | Bochumer Eisen Heintzmann | Hydraulic multiple telescopic cylinder |
| JPH11336714A (en) * | 1998-05-21 | 1999-12-07 | Toyota Autom Loom Works Ltd | Stroke position detector for fluid pressure cylinder and lift cylinder for fork lift |
| FR2794196A1 (en) * | 1999-05-31 | 2000-12-01 | Pierre Clavel | Measurement and continuous display of actuator rod position utilizes cable connected at end to rod and wound round rotating drum |
| US20100050863A1 (en) * | 2008-08-29 | 2010-03-04 | Cowan Dynamics Inc. | Fluid-powered actuator having an internal position sensor and a sensor module therefor |
| CN101922483A (en) * | 2010-07-12 | 2010-12-22 | 无锡市长江液压缸厂 | Short-range pressure-retaining high-pressure heavy hydraulic cylinder with built-in linear displacement sensor |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111608609A (en) * | 2020-04-21 | 2020-09-01 | 中国海洋石油集团有限公司 | Double-medium hydraulic injection cylinder |
| CN112503056A (en) * | 2020-11-17 | 2021-03-16 | 中联重科股份有限公司 | Oil cylinder, multi-oil-cylinder synchronous control system, control method and crane |
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