CN104791325A - Pressurization prevention multistage oil cylinder - Google Patents

Pressurization prevention multistage oil cylinder Download PDF

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Publication number
CN104791325A
CN104791325A CN201510221229.2A CN201510221229A CN104791325A CN 104791325 A CN104791325 A CN 104791325A CN 201510221229 A CN201510221229 A CN 201510221229A CN 104791325 A CN104791325 A CN 104791325A
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CN
China
Prior art keywords
cylinder
spool
hole
piston
diameter
Prior art date
Application number
CN201510221229.2A
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Chinese (zh)
Other versions
CN104791325B (en
Inventor
陈善坤
李精龙
方忠磊
郑家菊
朱红梅
Original Assignee
合肥长源液压股份有限公司
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Priority to CN201510221229.2A priority Critical patent/CN104791325B/en
Publication of CN104791325A publication Critical patent/CN104791325A/en
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Publication of CN104791325B publication Critical patent/CN104791325B/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
    • F15B15/1409Characterised by the construction of the motor unit of the straight-cylinder type with two or more independently movable working pistons
    • 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
    • F15B13/00Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • F15B13/025Pressure reducing valves
    • 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
    • F15B15/1447Pistons; Piston to piston rod assemblies
    • 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
    • F15B15/16Characterised by the construction of the motor unit of the straight-cylinder type of the telescopic type
    • 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
    • F15B20/00Safety arrangements for fluid actuator systems; Applications of safety devices in fluid actuator systems; Emergency measures for fluid actuator systems

Abstract

A pressurization prevention multistage oil cylinder comprises an outer cylinder barrel, a piston rod and one or more middle cylinder barrels sequentially arranged between the outer cylinder barrel and the piston rod in a sleeving mode, and the outer wall of the piston rod and the outer wall of the bottom end of each stage of middle cylinder barrel are sleeved with annular pistons. Each piston is provided with a decompressor. Each decompressor comprises a valve seat, a valve element, a spring and a valve sleeve. A first oil hole communicated with a rodless cavity and an axial mounting through hole is formed in each valve seat. Each valve element is of a stepped shaft structure, the small-diameter section of each valve element is close to the corresponding valve seat, the outer wall of the large-diameter section of each valve element is matched with the wall of the corresponding axial mounting hole, a pushing cavity is formed between the small-diameter section of each valve element, the wall of the corresponding axial mounting hole, the corresponding valve seat and the large-diameter section of each valve element, and a second oil hole is formed in each piston. According to the pressurization prevention multistage oil cylinder, when the supercharge pressure of a rod cavity reaches a certain value, oil in the rod cavity flows to the rodless cavity through the second oil holes, the pushing cavities and the first oil holes, and the pressurization effect problem of the rod cavity is solved effectively, and cylinder expansion accidents are avoided.

Description

Anti-supercharging multi-stage oil cylinder
Technical field
The present invention relates to a kind of anti-supercharging multi-stage oil cylinder.
Background technique
Multi-stage oil cylinder is set with by multiple piston-type hydraulic cylinder and forms, and the cylinder barrel of rear stage piston cylinder is equivalent to the piston rod of previous stage piston cylinder.When pressure oil enters from rodless cavity, the maximum cylinder barrel of piston effective area starts to stretch out, when walking to terminal, the cylinder barrel that piston effective area takes second place starts to stretch out, therefore very long working stroke can be obtained, and overhanging cylinder barrel useful area is less, speed of stretching out is faster, and corresponding hydraulic thrust from large to small.The Changing Pattern of this thrust, speed, is just meeting the job requirements of most of work mechanism, so this oil cylinder is widely applied in the field such as environmental sanitation and mine.
Multi-stage oil cylinder in use, delayed due to system response time, rod chamber oil circuit is easily caused to be blocked, especially system after a period of operation, due to the pollution of fluid, the situations such as return check valve or selector valve often block, if rod chamber oil circuit is blocked, because piston two ends will reach equilibrium of forces, and multi-stage oil cylinder rodless cavity effective active area is always greater than rod chamber effective active area, therefore, pressurized effect can be produced in the rod chamber of multi-stage oil cylinder, and boost pressure is once exceed the yield strength of cylinder barrel, will plastic deformation be there is in cylinder barrel, rise cylinder accident.
Summary of the invention
Technical problem to be solved by this invention is to provide the anti-supercharging multi-stage oil cylinder that a kind of structure is simple, effectively can solve the pressurized effect problem of rod chamber.
In order to solve the problems of the technologies described above, the present invention adopts following technological scheme: anti-supercharging multi-stage oil cylinder, comprise outer cylinder (1), the more than one middle cylinder barrel (3) being sheathed on the piston rod (2) in outer cylinder (1) and being sheathed on successively between outer cylinder (1) and piston rod (2), the bottom of outer cylinder (1) is provided with cylinder bottom (11), the top of outer cylinder (1) and every grade of middle cylinder barrel (3) is equipped with end cap (4), the bottom outer wall of piston rod (2) and every grade of middle cylinder barrel (3) is all set with the piston (5) of ring-type, outer cylinder (1), cylinder bottom (11) and described piston (5) enclose and form rodless cavity (a), outer cylinder (1), described middle cylinder barrel (3), piston rod (2), described piston (5) and described end cap (4) enclose the rod chamber (b) forming respective numbers,
Piston rod (2) is hollow structure, the top of piston rod (2) is provided with rodless cavity hydraulic fluid port (21) and rod chamber hydraulic fluid port (22), rodless cavity hydraulic fluid port (21) is communicated with rodless cavity (a) by the first oil duct (23) be located in piston rod (2), first oil duct (23) outer wall and piston rod (2) inwall enclose formation second oil duct, piston rod (2) and every grade of middle cylinder barrel (3) all have spill port (31), rod chamber hydraulic fluid port (22) is communicated with described rod chamber (b) by the second oil duct (24) and described spill port (31),
Described piston (5) is provided with decompressor, described decompressor comprises valve seat (61), spool (62), spring (63) and valve pocket (64), the axis described piston (5) had for installing decompressor installs through hole (51), valve seat (61) sealing is arranged on the one end of axially installing the close cylinder bottom (11) of through hole (51), valve pocket (64) sealing is arranged on the one end away from cylinder bottom (11) of axially installing through hole (51), spool (62) is positioned between valve seat (61) and valve pocket (64), spring (63) is positioned between spool (62) and valve pocket (64), valve seat (61) has the first oilhole (611) being communicated with rodless cavity (a) and axially installing through hole (51), spool (62) is multidiameter shaft structure, the diameter of spool (62) comparatively segment near valve seat (61), diameter larger section of outer wall of spool (62) is installed through hole (51) hole wall with axis and is matched, under the elastic force effect of spring (63), the diameter of spool (62) comparatively segment blocks the first oilhole (611), the diameter of spool (62) comparatively install between through hole (51) hole wall by valve seat (61) by segment and axis, larger section of the diameter of spool (62) encloses and forms push chamber (c), described piston (5) has the second oilhole (52) being communicated with push chamber (c) and corresponding rod chamber (b), spool (62) has balancing orifice (621), the first oilhole (611) is led in one end of balancing orifice (621), the other end of balancing orifice (621) leads to spring (63) the place section axially installing through hole (51).
Beneficial effect of the present invention is: the present invention by arranging decompressor on piston (5), can when rod chamber (b) boost pressure reaches certain value, the fluid in rod chamber (b) is made to flow to rodless cavity (a) by the second oilhole (52), push chamber (c) and the first oilhole (611), thus efficiently solve the pressurized effect problem of rod chamber (b), the generation of cylinder accident of avoiding rising.The present invention also has the advantage that structure is simple, be easy to manufacture, can save installing space in addition.
Further, diameter larger section of outer wall of described spool (62) is provided with multiple balancing slit (622).Adopt this structure, can radial force on balance valve core (62), eliminate the lateral hydraulic force on spool (62).
Further, the diameter of described spool (62) comparatively segment free end is truncated cone, and the diameter of spool (62) comparatively segment free end stretches into the first oilhole (611) and matches with the first oilhole (611) hole wall.Adopt this structure, the diameter that can increase spool (62) is the area of contact of segment and the first oilhole (611) hole wall and compatible degree comparatively, thus improves plugging effect.
Further, described second oilhole (52) by one section of axial bore (521) be opened in the ring annular groove (522) axially installing through hole (51) hole wall and be connected and form, the position of annular groove (522) is corresponding to push chamber (c), and axial bore (521) extends to annular groove (522) from an end face of the close rod chamber (b) of described piston (5).Adopt this structure, fluid can pass in and out push chamber (c) equably.
Accompanying drawing explanation
Fig. 1 is the structural representation of one embodiment of the invention.
Fig. 2 is I place's enlarged view in Fig. 1.
Being labeled as of each parts in accompanying drawing: 1 outer cylinder, 11 cylinder bottoms, 2 piston rods, 21 rodless cavity hydraulic fluid ports, 22 rod chamber hydraulic fluid ports, 23 first oil ducts, 24 second oil ducts, 3 middle cylinder barrels, 31 spill ports, 4 end caps, 5 pistons, 51 axially install through hole, 52 second oilholes, 521 axial bores, 522 annular grooves, 61 valve seats, 611 first oilholes, 62 spools, 621 balancing orifices, 622 balancing slits, 63 springs, 64 valve pockets, a rodless cavity, b rod chamber, c push chamber.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described:
See Fig. 1 and Fig. 2.
The anti-supercharging multi-stage oil cylinder of one embodiment of the invention, comprise outer cylinder 1, be sheathed on the piston rod 2 in outer cylinder 1 and be sheathed on the more than one middle cylinder barrel 3 between outer cylinder 1 and piston rod 2 successively, for convenience of describing, the present embodiment is chosen only has the situation of a middle cylinder barrel 3 to be described, it should be apparent to those skilled in the art that, under routine, the quantity of middle cylinder barrel can up to more than ten;
The bottom of outer cylinder 1 is provided with cylinder bottom 11, the top of outer cylinder 1 and every grade of middle cylinder barrel 3 is equipped with end cap 4, the bottom outer wall of piston rod 2 and every grade of middle cylinder barrel 3 is all set with the piston 5 of ring-type, outer cylinder 1, cylinder bottom 11 and described piston 5 enclose and form rodless cavity a, and outer cylinder 1, middle cylinder barrel 3, piston rod 2, described piston 5 and described end cap 4 enclose formation two rod chamber b;
Piston rod 2 is hollow structure, the top of piston rod 2 is provided with rodless cavity hydraulic fluid port 21 and rod chamber hydraulic fluid port 22, rodless cavity hydraulic fluid port 21 is communicated with rodless cavity a by the first oil duct 23 be located in piston rod 2, first oil duct 23 outer wall and piston rod 2 inwall enclose formation second oil duct, piston rod 2 and every grade of middle cylinder barrel 3 all have spill port 31, and rod chamber hydraulic fluid port 22 is communicated with described rod chamber b by the second oil duct 24 and described spill port 31;
Described piston 5 is provided with decompressor, described decompressor comprises valve seat 61, spool 62, spring 63 and valve pocket 64, the axis described piston 5 had for installing decompressor installs through hole 51, valve seat 61 sealing is arranged on the one end of the close cylinder bottom 11 axially installing through hole 51, valve pocket 64 sealing is arranged on the one end away from cylinder bottom 11 of axially installing through hole 51, valve seat 61 and valve pocket 64 are all installed by the mode of scyewed joint, during installation and axially install between through hole 51 hole wall and all sealed by seal ring, spool 62 is between valve seat 61 and valve pocket 64, spring 63 is between spool 62 and valve pocket 64, one end of spring 63 snaps in spool 62, the other end snaps in valve pocket 64, such spring 63 torsional deformation is less likely to occur, valve seat 61 has the first oilhole 611 being communicated with rodless cavity a and axially installing through hole 51, spool 62 is multidiameter shaft structure, the diameter of spool 62 comparatively segment near valve seat 61, diameter larger section of outer wall of spool 62 is installed through hole 51 hole wall with axis and is matched, under the elastic force effect of spring 63, the diameter of spool 62 comparatively segment blocks the first oilhole 611, the diameter of spool 62 comparatively install between through hole 51 hole wall by valve seat 61 by segment and axis, larger section of the diameter of spool 62 encloses and forms push chamber c, described piston 5 has the second oilhole 52 being communicated with push chamber c and corresponding rod chamber b, second oilhole 52 by one section of axial bore 521 be opened in the ring annular groove 522 axially installing through hole 51 hole wall and be connected and form, the position of annular groove 522 is corresponding to push chamber c, axial bore 521 extends to annular groove 522 from an end face of the close rod chamber b of described piston 5, such design, fluid can pass in and out push chamber c equably, spool 62 has balancing orifice 621, the first oilhole 611 is led in one end of balancing orifice 621, the other end of balancing orifice 621 leads to the spring 63 place section axially installing through hole 51, arranging balancing orifice 621 is to make the pressure of spool 62 both sides equal, avoid occurring that pressure difference hinders the movement of spool 62.
Diameter larger section of outer wall of described spool 62 is provided with multiple balancing slit 622.Like this can radial force on balance valve core 62, eliminate the lateral hydraulic force on spool 62.
The diameter of described spool 62 comparatively segment free end is truncated cone, and the diameter of spool 62 comparatively segment free end stretches into the first oilhole 611 and matches with the first oilhole 611 hole wall.Adopt this structure, the diameter that can increase spool 62 compared with the area of contact of segment and the first oilhole 611 hole wall and compatible degree, thus improves plugging effect.
The working procedure of the anti-supercharging multi-stage oil cylinder of one embodiment of the invention is: set rodless cavity a cylinder diameter as D, then rodless cavity a effective active area rod chamber bar b footpath is d, then rod chamber b effective active area when pressure oil enters rodless cavity a from rodless cavity hydraulic fluid port 21, due to the difference of active area, first middle cylinder barrel 3 stretches out with piston rod 2 under the effect of pressure oil, after middle cylinder barrel 3 stretches out and puts in place, piston rod 2 starts to stretch out, and wholely stretches out process, by rod chamber hydraulic fluid port 22 oil return; Otherwise when rod chamber hydraulic fluid port 22 enters pressure oil, rodless cavity hydraulic fluid port 21 oil return, first pressure oil enter piston rod 2, and piston rod 2 was retracted before this, then be that middle cylinder barrel 3 is retracted, and when middle cylinder barrel 3 more, stretch out and retract according to above-mentioned rule.
In using process of the present invention, when producing pressurized effect in rod chamber b, by fluid mechanics Hydrostatic Transfer Device principle, known:
PA = P 1 A 1 ⇒ π D 2 P 4 = π ( D 2 - d 2 ) P 1 4 ⇒ P 1 P = D 2 ( D 2 - d ) ⇒ P 1 = D 2 P ( D 2 - d 2 )
In above formula, P is rodless cavity input pressure, P 1rod chamber boost pressure.
Because push chamber c is connected with corresponding rod chamber b, therefore, as rod chamber boost pressure P 1when reaching the setting pressure of described decompressor, the elastic force promotion spool 62 that push chamber c inner fluid pressure can overcome spring 63 moves towards valve pocket 64, make the diameter of spool 62 comparatively segment be separated with valve seat 61, first oilhole 611 is opened, now, fluid in corresponding rod chamber b will flow to rodless cavity a by the second oilhole 52, push chamber c and the first oilhole 611, thus makes rod chamber boost pressure P 1greatly reduced, therefore the present invention effectively can solve the pressurized effect problem of rod chamber b, and the generation of cylinder accident of avoiding rising, can available protecting oil cylinder.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.Such as, the present invention and multi-stage cylinder principle similar, also belong to protection scope of the present invention when being therefore applied to Pneumatic Transmission.

Claims (4)

1. anti-supercharging multi-stage oil cylinder, comprise outer cylinder (1), the more than one middle cylinder barrel (3) being sheathed on the piston rod (2) in outer cylinder (1) and being sheathed on successively between outer cylinder (1) and piston rod (2), the bottom of outer cylinder (1) is provided with cylinder bottom (11), the top of outer cylinder (1) and every grade of middle cylinder barrel (3) is equipped with end cap (4), the bottom outer wall of piston rod (2) and every grade of middle cylinder barrel (3) is all set with the piston (5) of ring-type, outer cylinder (1), cylinder bottom (11) and described piston (5) enclose and form rodless cavity (a), outer cylinder (1), described middle cylinder barrel (3), piston rod (2), described piston (5) and described end cap (4) enclose the rod chamber (b) forming respective numbers,
Piston rod (2) is hollow structure, the top of piston rod (2) is provided with rodless cavity hydraulic fluid port (21) and rod chamber hydraulic fluid port (22), rodless cavity hydraulic fluid port (21) is communicated with rodless cavity (a) by the first oil duct (23) be located in piston rod (2), first oil duct (23) outer wall and piston rod (2) inwall enclose formation second oil duct, piston rod (2) and every grade of middle cylinder barrel (3) all have spill port (31), rod chamber hydraulic fluid port (22) is communicated with described rod chamber (b) by the second oil duct (24) and described spill port (31),
It is characterized in that: described piston (5) is provided with decompressor, described decompressor comprises valve seat (61), spool (62), spring (63) and valve pocket (64), the axis described piston (5) had for installing decompressor installs through hole (51), valve seat (61) sealing is arranged on the one end of axially installing the close cylinder bottom (11) of through hole (51), valve pocket (64) sealing is arranged on the one end away from cylinder bottom (11) of axially installing through hole (51), spool (62) is positioned between valve seat (61) and valve pocket (64), spring (63) is positioned between spool (62) and valve pocket (64), valve seat (61) has the first oilhole (611) being communicated with rodless cavity (a) and axially installing through hole (51), spool (62) is multidiameter shaft structure, the diameter of spool (62) comparatively segment near valve seat (61), diameter larger section of outer wall of spool (62) is installed through hole (51) hole wall with axis and is matched, under the elastic force effect of spring (63), the diameter of spool (62) comparatively segment blocks the first oilhole (611), the diameter of spool (62) comparatively install between through hole (51) hole wall by valve seat (61) by segment and axis, larger section of the diameter of spool (62) encloses and forms push chamber (c), described piston (5) has the second oilhole (52) being communicated with push chamber (c) and corresponding rod chamber (b), spool (62) has balancing orifice (621), the first oilhole (611) is led in one end of balancing orifice (621), the other end of balancing orifice (621) leads to spring (63) the place section axially installing through hole (51).
2. anti-supercharging multi-stage oil cylinder as claimed in claim 1, is characterized in that: diameter larger section of outer wall of described spool (62) is provided with multiple balancing slit (622).
3. anti-supercharging multi-stage oil cylinder as claimed in claim 1 or 2, it is characterized in that: the diameter of described spool (62) comparatively segment free end is truncated cone, the diameter of spool (62) comparatively segment free end stretches into the first oilhole (611) and matches with the first oilhole (611) hole wall.
4. anti-supercharging multi-stage oil cylinder as claimed in claim 1 or 2, it is characterized in that: described second oilhole (52) by one section of axial bore (521) be opened in the ring annular groove (522) axially installing through hole (51) hole wall and be connected and form, the position of annular groove (522) is corresponding to push chamber (c), and axial bore (521) extends to annular groove (522) from an end face of the close rod chamber (b) of described piston (5).
CN201510221229.2A 2015-04-30 2015-04-30 Anti-supercharging multi-stage oil cylinder CN104791325B (en)

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CN104791325B CN104791325B (en) 2016-09-07

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106593991A (en) * 2016-05-26 2017-04-26 广东南曦液压机械有限公司 Anti-pressurization multi-stage hydraulic cylinder
CN106678122A (en) * 2017-02-20 2017-05-17 合肥长源液压股份有限公司 Child-mother differential hydraulic cylinder
CN109340209A (en) * 2018-10-29 2019-02-15 山西平阳重工机械有限责任公司 The double telescopic oil cylinders of carbon fiber for motor-car rescue
CN109654085A (en) * 2018-12-29 2019-04-19 武昌船舶重工集团有限公司 A kind of lifesaving breakout equipment cylinder and its application

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JPH08312609A (en) * 1995-05-22 1996-11-26 Toyooki Kogyo Co Ltd Hydraulic cylinder with air vent mechanism
US20030037668A1 (en) * 2001-08-21 2003-02-27 Alan Nastasi Hydraulic cylinder stroke stop mounting
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Publication number Priority date Publication date Assignee Title
CN106593991A (en) * 2016-05-26 2017-04-26 广东南曦液压机械有限公司 Anti-pressurization multi-stage hydraulic cylinder
CN106678122A (en) * 2017-02-20 2017-05-17 合肥长源液压股份有限公司 Child-mother differential hydraulic cylinder
CN106678122B (en) * 2017-02-20 2018-05-04 合肥长源液压股份有限公司 A kind of primary and secondary differential hydro cylinder
CN109340209A (en) * 2018-10-29 2019-02-15 山西平阳重工机械有限责任公司 The double telescopic oil cylinders of carbon fiber for motor-car rescue
CN109654085A (en) * 2018-12-29 2019-04-19 武昌船舶重工集团有限公司 A kind of lifesaving breakout equipment cylinder and its application

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