CN102691692B - Multi-stage pressure composite cylinder - Google Patents

Multi-stage pressure composite cylinder Download PDF

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Publication number
CN102691692B
CN102691692B CN201210111921.6A CN201210111921A CN102691692B CN 102691692 B CN102691692 B CN 102691692B CN 201210111921 A CN201210111921 A CN 201210111921A CN 102691692 B CN102691692 B CN 102691692B
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CN
China
Prior art keywords
piston
cylinder
cavity
rod
piston rod
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Expired - Fee Related
Application number
CN201210111921.6A
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Chinese (zh)
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CN102691692A (en
Inventor
姚凤银
胡永波
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XINCHANG DAYOU MACHINERY CO Ltd
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XINCHANG DAYOU MACHINERY CO Ltd
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Priority to CN201210111921.6A priority Critical patent/CN102691692B/en
Publication of CN102691692A publication Critical patent/CN102691692A/en
Application granted granted Critical
Publication of CN102691692B publication Critical patent/CN102691692B/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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Abstract

The invention relates to a multistage pressure composite cylinder, which solves the defects of incapability of relative displacement and multi independent strokes because of the only one connection end of the multistage telescopic piston rod in the prior art. The composite cylinder comprises a cylinder body equipped with at least one partition part therein, and a piston rod mounted in the body. One end of the piston rod is mounted in the cavity close to the end cap of the sealed bottom, the external of the piston rod is covered with a plurality of coaxial piston bushes the number of which is the same as that of the partition part which is sealed with the outer wall of the corresponding piston rod or outer wall of the piston cover. The ends of the piston bush and the piston rod are extended out of the sealed top end cap. The piston bush and the piston rod over cover with each other, have their ends extended out of the sealed top end cap, have a corresponding cavity in the cylinder body and are incapable of independently telescoping, thereby forming multistage strokes.

Description

Multi-stage pressure composite cylinder
Technical field
The present invention relates to a kind of flow energy pressure cylinder, especially a kind of have can the feature that controls separately of multistage stroke, and can be combined to form the multi-stage pressure composite cylinder that multiple Telescopic coordinates between every one-level stroke.
Background technique
Telescopic cylinder is divided into oil hydraulic cylinder and cylinder according to the source pressure used.Hydraulic energy is changed into mechanical energy, does the hydraulic actuator of straight reciprocating motion (or oscillating motion) by oil hydraulic cylinder.According to the structural type of conventional oil hydraulic cylinder, Four types can be divided into: piston type, plunger type, telescopic and swing type.
Single-piston-rod hydraulic cylinder only has one end to have piston rod, and hydraulic fluid port A and B is imported and exported at its two ends all can lead to pressure oil or oil return, to realize bidirectional-movement, therefore is called double acting cylinder.Plunger type cylinder is a kind of single-acting formula oil hydraulic cylinder, and can only realize the motion in a direction by hydraulic coupling, plunger backhaul will lean on the deadweight of other external force or plunger.Telescoping hydraulic cylinder has secondary or multi-level piston, and from big to small, unloaded order of retracting is generally then from small to large to the sequential that in telescoping hydraulic cylinder, piston stretches out.Spiral swing hydranlic pressure jar is output torque and realizes reciprocating executive component.
Telescopic cylinder can realize longer stroke, and when retracting, length is shorter, and structure is comparatively compact.The length of the flexible rod in existing multi-stage expansion cylinder is fixing, and flexible power is transmitted by flexible rod, mainly through flexible rod flexible come stroke and backhaul.Existing telescopic cylinder can not complete multiple drive power and stretch, and telescopic cylinder, when work, only has a kind of stroke, again can not realize second level stroke or three grades of formation after completing a kind of stroke.
Patent Office of the People's Republic of China has announced a CN2423449Y patent March 14 calendar year 2001, name is called pinpoint multiple-pass combined cylinders, comprise a cylinder body, and comprise three with the piston group of upper piston, match in the footpath, chamber in the stroke limit chamber at the same level that shape and its of each piston are positioned at and adjacent upper level or next stage stroke limit chamber, the footpath, chamber in each stroke limit chamber is gradin, the piston controlling these areas are changed step by step by gas circuit moves step by step under the driving of pressure difference, output piston bar is finally made to realize accurate multiple-pass telemechanical, other actuators are driven to form several different position form.The stroke of this cylinder is realized by the flexible of piston rod completely, the extrusion of control piston bar forms multistage stroke, but piston rod only has an end, outside parts to be supported can only be connected with the end of piston rod, the stroke with relative displacement can not be produced, multiple independent stroke cannot be produced.
Patent Office of the People's Republic of China has announced a CN2931886Y patent on August 8th, 2007, name is called glass fibre reinforced plastic anti-rotary multistage cylinder, comprise piston rod portion, Multi-stage cylinder part and outer cylinder portion, in cylinder base plate in the heart, the square interior pipe of outer shell is set, be placed in Multi-stage cylinder lower end cap square through hole, in Multi-stage cylinder lower end cap in the heart, offer square through hole, in Multi-stage cylinder lower end cap in the heart, arrange the square interior pipe of Multi-stage cylinder, one end is placed in piston-rod lower end lid square through hole, and the other end welds with Multi-stage cylinder lower end cap.Time the Multi-stage cylinder part of this multi-stage cylinder is subject to in-cylinder pressure, piston rod stretches out, but piston rod only has an end, and outside parts to be supported can only be connected with the end of piston rod, the stroke with relative displacement can not be produced, multiple independent stroke cannot be produced.
Summary of the invention
The object of this invention is to provide a kind of novel telescoping pressure cylinder, especially a kind of multi-stage pressure composite cylinder, the end of pressure cylinder has multiple connecting end be connected with outside parts to be supported, and different connecting ends can stretch out respectively, thus produces multistage stroke and can control separately.
The invention solves the piston rod of multi-stage telescopic in prior art and only have a connecting end, relative displacement can not be produced, the defect of multiple independent stroke cannot be produced, a kind of multi-stage pressure composite cylinder is provided, the end of pressure cylinder has multiple connecting end, different connecting ends stretches out respectively, can produce relative displacement, and produces multiple independently stroke.
The technical solution adopted for the present invention to solve the technical problems is: a kind of multi-stage pressure composite cylinder, comprise cylinder body and be arranged on the piston rod in cylinder body, the two ends of cylinder body are respectively arranged with sealed bottom lid and sealing top end cap, one is at least fixed with every portion in cylinder body, every portion cylinder interior is separated into some cavitys, the two ends of each cavity are respectively arranged with an intercommunicating pore; An end of piston rod is in the cavity place near sealed bottom lid, piston rod outer cover is equipped with multiple coaxial piston sleeve, the quantity of piston sleeve is equal with the quantity every portion, seal mutually with corresponding piston rod outer wall or piston sleeve outer wall every portion, the end of piston sleeve and the end of piston rod all reach outside sealing top end cap.Be the flexible driving cavity of piston rod between portion and sealed bottom lid, every portion and be driving cavity that piston sleeve stretches between portion or between portion and sealing top end cap; Piston rod produces an independently stroke, and a piston sleeve produces an independently stroke, and increasing by one increases a piston sleeve every portion simultaneously and just can increase an independently stroke; If piston sleeve is one, forms two-stage stroke in conjunction with piston rod, if piston sleeve is two, form three grades of strokes in conjunction with piston rod, by that analogy; The intercommunicating pore at cavity two ends can injection pressure oil or gas thus promote piston rod or piston sleeve stretches in cavity in the past; The end of piston rod end and piston sleeve all reaches outside sealing top end cap, and the end of stretching out connects parts to be supported, and separate different stroke can produce different motions; Cavity can be arranged to different length, and the different length of cavity produces different stroke combinations.
As preferably, piston rod is divided into piston and stopper rod, and the external diameter of piston is greater than the external diameter of stopper rod, and piston seals mutually with cavity inner wall, sealing mutually every portion and stopper rod of corresponding piston rod, and piston is between the intercommunicating pore at these cavity two ends.Piston rod moves ahead, and hydraulic oil or gas pressure are applied to the end face of piston, and piston rod bounces back, and hydraulic oil or gas pressure are applied on the annular end face that formed between piston and stopper rod; Two intercommunicating pores are communicated with hydraulic oil or the gas of different pressures, thus generation moves ahead or bounces back.
As preferably, piston sleeve is divided into piston portion and loop bar, and the external diameter of piston portion is greater than the external diameter of loop bar, and piston portion seals mutually with cavity inner wall, sealing mutually every portion and loop bar of corresponding loop bar, and piston portion is between the intercommunicating pore at respective chamber two ends.Piston sleeve moves ahead, and hydraulic oil or gas pressure are applied to the end face of piston portion, and piston sleeve bounces back, and hydraulic oil or gas pressure are applied on the annular end face that formed between piston portion and loop bar; Two intercommunicating pores are communicated with hydraulic oil or the gas of different pressures, thus generation moves ahead or bounces back.
As preferably, piston sleeve is coaxially nested with mutually, and outside piston sleeve is nested with on the loop bar of the piston sleeve of inside; Be provided with seal ring between piston sleeve and stopper rod, between the loop bar that outside piston sleeve and internal piston overlap, be provided with seal ring.Piston sleeve is nested with mutually, the guide element that inner piston sleeve can stretch as outer piston cover; Seal ring plays seal action, prevents hydraulic oil seepage or Leakage Gas.
As preferably, the intercommunicating pore at the cavity two ends of corresponding piston sleeve is arranged on cylinder body, and the end of the piston portion of piston sleeve is provided with protuberance, and the external diameter of protuberance is less than the external diameter of piston portion; The end face edge of the other end of piston portion is radiussed.Protuberance withstands the end face every portion, makes the end face of piston portion and between portion, forms a cavity, directly enters into cavity and be applied to the end face of piston portion time hydraulic oil or gas enter from intercommunicating pore; Radiussed is also to form a cavity, and hydraulic oil or gas can be applied on the annular end face of piston portion.
As preferably, the edge that piston portion arranges the end face of protuberance is radiussed.Facilitate hydraulic oil or gas to enter in cavity, prevent hydraulic oil or gas from being hindered.
As preferably, the intercommunicating pore at the two ends of the cavity of corresponding piston rod, one of them intercommunicating pore is arranged at sealed bottom and covers, and another intercommunicating pore is arranged on the cylinder body of the cavity the other end; The end face edge of the piston of the intercommunicating pore side on piston rod on corresponding cylinder body is bevelling shape; The end face of the piston on piston rod is provided with heavy chamber, and heavy chamber communicates with the intercommunicating pore that sealed bottom covers.Hydraulic oil or gas to enter in heavy chamber from the intercommunicating pore that sealed bottom covers and are applied to the bottom surface in heavy chamber; Bevelling shape forms a cavity, facilitates hydraulic oil or gas to enter into this cavity from another intercommunicating pore.
As preferably, the centre of sealed bottom lid is provided with circular hole, and the centre of one end of the corresponding sealed bottom lid of piston rod is provided with cylinder, and cylinder to be inserted in circular hole and to be sealed by seal ring, and the end of cylinder connects prober; The length of cylinder is greater than the stroke of piston rod.Cylinder moves relative to circular hole, and prober can detection pressure, and detection displacement, can control the rotation of inner rotation body simultaneously.
As preferably, cylinder body is segmentation structure, and the quantity of section is equal with the quantity sum of piston rod and piston sleeve, and fixed by straight button Flange joint between section and section, the connecting end surface between section and section is provided with the ladder surface mutually coincide.Segmented cylinder body is easy to make, especially can ensure the precision of each section of processing.
As preferably, the section of cylinder body and the section end of directly detaining Flange joint are provided with every portion, and after section is connected with section, adjacent contacts every end surface and seal.Each section is all provided with every portion, improves and connects cylinder body section and the sealability be connected between section.
The invention has the beneficial effects as follows: piston sleeve and piston rod are nested with mutually, and end all reaches outside sealing top end cap, piston sleeve and a cavity in the equal corresponding cylinder body of piston rod, piston sleeve and piston rod be energy independent telescope all, forms multistage stroke.
Accompanying drawing explanation
Fig. 1 is a kind of structural representation of the present invention;
Fig. 2 is that the present invention's one runs intermediateness schematic diagram;
Fig. 3 is that the present invention's one runs end-state schematic diagram;
Fig. 4 is the another kind of structural representation of the present invention;
In figure: 1, sealed bottom lid, 2, cylinder body, 3, piston, 4, intercommunicating pore, 5, directly flange is detained, 6, protuberance, 7, stopper rod, 8, first stage piston cover, 9, loop bar, 10, apical end should, 11, every portion, 12, one-level cavity 13, piston rod, 14, circular hole, 15, cylinder, 16, prober, 17, secondary cavity, 18, second piston cover, 19, three grades of cavitys, 20, heavy chamber.
Embodiment
Below by specific embodiment, and by reference to the accompanying drawings, technological scheme of the present invention is described in further detail.
Embodiment 1: a kind of two-stage type oil hydraulic cylinder (see accompanying drawing 1), and comprise cylinder body 2 and be arranged on piston rod in cylinder body 13 and be nested with first stage piston cover 8 on the piston rod, the two ends of cylinder body are respectively arranged with sealed bottom lid 1 and sealing top end cap 10.
Cylinder body is divided into two sections, is connected and fixed integral between section and section by straight button flange 5.One end of one section of cylinder body arranges sealed bottom lid, and the other end is arranged every portion 11, forms one-level cavity 12 between portion and sealed bottom lid.One end of another section of cylinder body arranges sealing top end cap, and the other end arranges and between portion and sealing top end cap, forms secondary cavity 17 every portion.When two sections of cylinder bodies connect, relative every portion.Sealed bottom covers and is provided with intercommunicating pore 4, and near the position in portion is provided with intercommunicating pore on cylinder body, two intercommunicating pores are communicated with one-level cavity.The intermediate portion of sealed bottom lid is provided with circular hole 14, and circular hole wall is provided with seal ring.The two ends of the cylinder body at secondary cavity place are respectively arranged with intercommunicating pore, and two intercommunicating pores are close every portion and sealing top end cap respectively.The end that two sections of cylinder bodies are relative is provided with the ladder surface of cooperation.
Piston rod is divided into piston 3 and stopper rod 7, and the external diameter of piston is greater than the external diameter of stopper rod, and piston seals mutually with one-level cavity inner wall, sealing mutually every portion and stopper rod of one-level cavity end, and piston is between the intercommunicating pore at one-level cavity two ends.The intermediate portion of piston is provided with the cylinder 15 matched with circular hole, and cylinder is inserted in circular hole, and the end of cylinder connects prober 16.The end face of piston is provided with heavy chamber 20, and heavy chamber communicates with the intercommunicating pore that sealed bottom covers.The corresponding end face edge every portion of piston is bevelling shape.The stroke of piston in one-level cavity is the stroke that 160mm is greater than in secondary cavity, and stopper rod is that multidiameter shaft is according to pressure distribution design size.
First stage piston cover is nested with in the little journal axle of stopper rod, and first stage piston cover is in secondary cavity 17.First stage piston cover is divided into piston portion and loop bar 9, and the external diameter of piston portion is greater than the external diameter of loop bar, and piston portion seals mutually with secondary cavity inner wall, sealing mutually every portion and loop bar of corresponding loop bar, and piston portion is between the intercommunicating pore at secondary cavity two ends.The inwall of first stage piston cover is provided with seal ring and seals mutually with the stopper rod of piston rod.The end position of first stage piston cover is provided with shoulder hole, and the external diameter of this shoulder hole and the large journal axle of stopper rod match, and the degree of depth of shoulder hole is the difference of adjacent stroke is 60mm.The end of piston portion is provided with protuberance 6, and the external diameter of protuberance is less than the external diameter of piston portion, and the peripheral part of protuberance forms cavity and communicates with the intercommunicating pore of secondary cavity, and the edge that piston portion arranges the end face of protuberance is radiussed.The end face edge of the other end of piston portion is radiussed, and fillet place forms cavity and communicates with the intercommunicating pore near sealing top end cap.
From the intercommunicating pore of sealed bottom lid toward injection liquid force feed in one-level cavity (see accompanying drawing 2 accompanying drawing 3), from the close intercommunicating pore every portion toward injection liquid force feed in secondary cavity, hydraulic oil is applied to the end face of piston and the end face of piston portion respectively, and piston rod and first stage piston cover are stretched out simultaneously.Until when first stage piston cover stretches out full stroke, keep the pressure of the hydraulic oil in secondary cavity, in one-level cavity, continue injection liquid force feed, the large journal axle of stopper rod extend in the shoulder hole of first stage piston cover simultaneously, until piston rod stretches out full stroke reach the desired stroke of design.
When retracting, oppositely injection liquid force feed in one-level cavity and in secondary cavity.Piston rod and first stage piston cover can synchronously be retracted herein, also can be that piston rod is first retracted, and then first stage piston cover is retracted again.
Embodiment 2: a kind of three grades of formula oil hydraulic cylinders (see accompanying drawing 4), comprise cylinder body 2 and the piston rod 13 that is arranged in cylinder body and the first stage piston cover 8, the second piston cover 18 that are nested with on the piston rod.
Cylinder body is divided into three sections, is connected and fixed integral between section and section by adpting flange 5.First paragraph cylinder body forms one-level cavity 12 by sealed bottom lid 1 with every portion 11, and second segment cylinder body forms secondary cavity the 17, three section of cylinder body by two every portion 11 and forms three grades of cavitys 19 by every portion and sealing top end cap.Piston rod is in one-level cavity, and first stage piston cover is in secondary cavity, and second piston cover is in three grades of cavitys.Being formed every portion and stopper rod of first paragraph cylinder body seals, and the loop bar overlapped every portion and first stage piston of second segment cylinder body is formed and seals, and the loop bar overlapped every portion and second piston of the 3rd section of cylinder body is formed and seals.All the other structures are with reference to embodiment 1.
The stroke of one-level cavity inner carrier is 160mm, and in secondary cavity, the stroke of first stage piston cover is 130mm, and in three grades of cavitys, the stroke of second piston cover is 100mm.Injection liquid force feed in one-level cavity, secondary cavity and three grades of cavitys, pressure oil promotes piston, first stage piston cover and second piston cover and stretches out.Second piston overlaps first full stroke, keeps the pressure in three grades of cavitys; Then first stage piston cover full stroke, keeps the pressure in secondary cavity, last piston rod full stroke, keeps the pressure in one-level cavity, finally finishes the work.
When retracting, inverse injection hydraulic oil in one-level cavity, secondary cavity and three grades of cavitys.Second piston cover is first retracted and is put in place, and then the retraction of first stage piston cover puts in place, and last piston rod is retracted and put in place.
Can simultaneously injection liquid force feed when retracting, also can before this toward injection liquid force feed in one-level cavity, piston rod is first retracted, then toward injection liquid force feed in secondary cavity, first stage piston cover is retracted, last toward injection liquid force feed in three grades of cavitys, second piston cover is retracted, and finally completes whole retraction.
Above-described embodiment is two kinds of preferred version of the present invention, not does any pro forma restriction to the present invention, also has other variant and remodeling under the prerequisite not exceeding the technological scheme described in claim.

Claims (10)

1. a multi-stage pressure composite cylinder, comprise cylinder body and be arranged on the piston rod in cylinder body, the two ends of cylinder body are respectively arranged with sealed bottom lid and sealing top end cap, it is characterized in that at least being fixed with one in cylinder body every portion, every portion, cylinder interior is separated into some cavitys, the two ends of each cavity are respectively arranged with an intercommunicating pore; An end of piston rod is in the cavity place near sealed bottom lid, piston rod outer cover is equipped with multiple coaxial piston sleeve, the quantity of piston sleeve is equal with the quantity every portion, seal mutually with corresponding piston rod outer wall or piston sleeve outer wall every portion, the end of piston sleeve and the end of piston rod all reach outside sealing top end cap; Piston rod is divided into piston and stopper rod, and the external diameter of piston is greater than the external diameter of stopper rod, and stopper rod is multidiameter shaft, and the end position of piston sleeve is provided with shoulder hole, and the external diameter of this shoulder hole and the large journal axle of stopper rod match.
2. multi-stage pressure composite cylinder according to claim 1, is characterized in that piston seals mutually with cavity inner wall, sealing mutually every portion and stopper rod of corresponding piston rod, and piston is between the intercommunicating pore at these cavity two ends.
3. multi-stage pressure composite cylinder according to claim 1, it is characterized in that piston sleeve is divided into piston portion and loop bar, the external diameter of piston portion is greater than the external diameter of loop bar, piston portion seals mutually with cavity inner wall, sealing mutually every portion and loop bar of corresponding loop bar, piston portion is between the intercommunicating pore at respective chamber two ends.
4. multi-stage pressure composite cylinder according to claim 3, is characterized in that piston sleeve is coaxially nested with mutually, and outside piston sleeve is nested with on the loop bar of the piston sleeve of inside; Be provided with seal ring between piston sleeve and stopper rod, between the loop bar that outside piston sleeve and internal piston overlap, be provided with seal ring.
5. the multi-stage pressure composite cylinder according to claim 3 or 4, it is characterized in that the intercommunicating pore at the cavity two ends of corresponding piston portion is arranged on cylinder body, the end of piston portion is provided with protuberance, and the external diameter of protuberance is less than the external diameter of piston portion; The end face edge of the other end of piston portion is radiussed.
6. multi-stage pressure composite cylinder according to claim 5, is characterized in that the edge that piston portion arranges the end face of protuberance is radiussed.
7. the multi-stage pressure composite cylinder according to claim 1 or 2 or 3 or 4, it is characterized in that the intercommunicating pore at the two ends of the cavity of corresponding piston, one of them intercommunicating pore is arranged at sealed bottom and covers, and another intercommunicating pore is arranged on the cylinder body of the cavity the other end; The end face edge of the piston of the intercommunicating pore side on piston rod on corresponding cylinder body is bevelling shape; The end face of the piston on piston rod is provided with heavy chamber, and heavy chamber communicates with the intercommunicating pore that sealed bottom covers.
8. the multi-stage pressure composite cylinder according to claim 1 or 2 or 3 or 4, it is characterized in that the centre of sealed bottom lid is provided with circular hole, the centre of one end of the corresponding sealed bottom lid of piston rod is provided with cylinder, and cylinder to be inserted in circular hole and to be sealed by seal ring, and the end of cylinder connects prober; The length of cylinder is greater than the stroke of piston rod.
9. the multi-stage pressure composite cylinder according to claim 1 or 2 or 3 or 4, it is characterized in that cylinder body is segmentation structure, the quantity of section is equal with the quantity sum of piston rod and piston sleeve, fix by directly detaining Flange joint between section and section, the connecting end surface between section and section is provided with the ladder surface cooperatively interacted.
10. multi-stage pressure composite cylinder according to claim 9, is characterized in that the end that the section of cylinder body is connected with section is provided with every portion, and after section is connected with section, adjacent contacts every end surface and seal.
CN201210111921.6A 2012-04-17 2012-04-17 Multi-stage pressure composite cylinder Expired - Fee Related CN102691692B (en)

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Application Number Priority Date Filing Date Title
CN201210111921.6A CN102691692B (en) 2012-04-17 2012-04-17 Multi-stage pressure composite cylinder

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CN102691692B true CN102691692B (en) 2015-06-03

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104595275B (en) * 2014-11-30 2017-02-22 贵州红林机械有限公司 Three-position precise air cylinder

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2423449Y (en) * 2000-04-19 2001-03-14 舒良 Multi-travel combination cylinder of accuracy positioned
CN1313933A (en) * 1998-07-08 2001-09-19 Aro公司 Actuator with approach pre-stroke and working stroke for operating a tool
CN1429996A (en) * 2003-01-21 2003-07-16 厦门大学 Multistage location sylinder
CN2716566Y (en) * 2004-08-06 2005-08-10 王贤新 Multisection pressure cylinder
CN202510455U (en) * 2012-04-17 2012-10-31 新昌县大有机械有限公司 Multistage pressure compound cylinder

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5231292B2 (en) * 2009-03-06 2013-07-10 Ckd株式会社 Cylinder

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1313933A (en) * 1998-07-08 2001-09-19 Aro公司 Actuator with approach pre-stroke and working stroke for operating a tool
CN2423449Y (en) * 2000-04-19 2001-03-14 舒良 Multi-travel combination cylinder of accuracy positioned
CN1429996A (en) * 2003-01-21 2003-07-16 厦门大学 Multistage location sylinder
CN2716566Y (en) * 2004-08-06 2005-08-10 王贤新 Multisection pressure cylinder
CN202510455U (en) * 2012-04-17 2012-10-31 新昌县大有机械有限公司 Multistage pressure compound cylinder

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