CN105370645B - Novel sequential action hydraulic cylinder - Google Patents
Novel sequential action hydraulic cylinder Download PDFInfo
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- CN105370645B CN105370645B CN201510945380.0A CN201510945380A CN105370645B CN 105370645 B CN105370645 B CN 105370645B CN 201510945380 A CN201510945380 A CN 201510945380A CN 105370645 B CN105370645 B CN 105370645B
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- hydraulic cylinder
- oil
- piston rod
- hydraulic
- fluid port
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Classifications
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- 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
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
- F15B11/20—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors controlling several interacting or sequentially-operating members
- F15B11/205—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors controlling several interacting or sequentially-operating members the position of the actuator controlling the fluid flow to the subsequent actuator
-
- 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
- F15B15/08—Characterised by the construction of the motor unit
- F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
- F15B15/1404—Characterised by the construction of the motor unit of the straight-cylinder type in clusters, e.g. multiple cylinders in one block
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Actuator (AREA)
Abstract
Disclosed is a novel sequential action hydraulic cylinder. The novel sequential action hydraulic cylinder is technically characterized by comprising a first hydraulic cylinder and a second hydraulic cylinder, the rear end of the first hydraulic cylinder is provided with an oil pushing supply opening, the front end of the first hydraulic cylinder is provided with an oil retraction supply opening communicated with a second oil cavity, a first oil duct is arranged in a piston rod of the first hydraulic cylinder, an oil hole is formed in the piston rod of the first hydraulic cylinder, a movable sealing block capable of sealing the oil hole is arranged in the second oil cavity, the second oil cavity is communicated with a first oil cavity inside the piston rod of the first hydraulic cylinder through the oil hole, a plugging head is provided with a first oil opening, a second oil opening and a second oil duct, the first oil opening is communicated with the first oil duct, the second oil opening is communicated with the first oil cavity through the second oil duct, the first oil opening is communicated with a third oil opening, the second oil opening is communicated with a fourth oil opening, the third oil opening is located behind a piston rod of the second hydraulic cylinder, and the fourth oil opening is located in the front of the tail of the piston rod of the second hydraulic cylinder. The two piston rods can sequentially act, and meanwhile the novel sequential action hydraulic cylinder has the advantages that the pushing speeds of the piston rods can be kept uniform and consistent and pushing force is large.
Description
Technical field：
The present invention relates to technical field of hydraulic pressure, and in particular to a kind of new sequentially-operating liquid applied in agricultural mechanical field
Cylinder pressure.
Background technology：
In the practical application that multiple hydraulic cylinders drive workpiece to complete corresponding actions, it is often necessary to which hydraulic cylinder is according to one
Fixed sequence of movement carries out action.At present the method for control multiple hydraulic cylinders sequence of movement mainly has：1st, Stress control：Using flat
The different Opening pressures such as weighing apparatus valve, counterbalance valve make hydraulic cylinder realize sequentially-operating；2nd, direction controlling：Using relay, travel switch
Deng according to certain order to solenoid valve, make hydraulic cylinder action, this both control modes adds additional outer member, one
Determine the complexity that system is increased in degree, reduce reliability, while manufacture and maintenance cost are increased, and to system
Mounting arrangements and use environment propose higher requirement.Especially in the agricultural machinery application with tractor as power, it is difficult
Using automatically controlled mode, it is merely able to be reached by the frame for movement of hydraulic cylinder itself and allows the piston sequentially-operating of multiple hydraulic cylinders
Purpose, and then control the break-make that next stage performs oil circuit by this little new sequentially-operating hydraulic cylinder.
Multi-stage telescopic hydraulic cylinder used by existing tractor operationally piston or the extended very long stroke of plunger, no
Piston or plunger can retract during work, and it takes up room little.But during all pistons or plunger stretch out, by each hydraulic cylinder
The sequence of movement of piston, each piston stretches out that speed gradually increases, thrust is gradually reduced, and for require to take up room it is little, push away
Send that distance is remote and pushing speed remains uniform occasion, existing multi-stage telescopic hydraulic cylinder under the conditions of ultralong-stroke, very
Difficulty completes the action that continuous push and multistage order are pushed, and existing multi-stage telescopic hydraulic cylinder is merely able to push a work department
Part action, using with limitation.
The content of the invention：
The present invention is to overcome the deficiencies in the prior art, there is provided a kind of new sequentially-operating hydraulic cylinder, it can make two work
Stopper rod action in order, while the big advantage of uniform consistent, thrust is kept with the pushing speed that can make each piston rod, super
Also it is capable of achieving continuous push, multistage order under Long travel to push the purpose of workpiece motion, and two workpieces can be pushed
Action.
The new sequentially-operating hydraulic cylinder of the present invention, the technical scheme for being adopted for achieving the above object is：Including
One hydraulic cylinder and second hydraulic cylinder, are provided with what is communicated with the cavity of first hydraulic cylinder on the cylinder body of the first hydraulic cylinder in rear end
Oil-feed port is pushed, first hydraulic cylinder piston rod is located in the cavity of first hydraulic cylinder by the piston seal seat of its rear end, piston
It is close to the inner surface of first hydraulic cylinder on the outside of seal receptacle, is formed between first hydraulic cylinder piston rod and the cavity of first hydraulic cylinder
Second oil pocket, the front end of first hydraulic cylinder is provided with sealing shroud on the outside of first hydraulic cylinder piston rod, the tail end of sealing shroud with
There is gap between the cylinder body of first hydraulic cylinder, offers and the second oil pocket on the outside of sealing shroud tail end in first hydraulic cylinder
The retraction oil-feed port for communicating, oilhole, first hydraulic cylinder are offered on first hydraulic cylinder piston rod in front of piston seal seat
Piston rod closes on the front of oilhole and forms dogging shoulder, and the second oil pocket interior being in is provided with mobile envelope block between dogging shoulder and piston seal seat,
Level offers the 3rd oil duct communicated with the cavity of first hydraulic cylinder, the inside of first hydraulic cylinder piston rod on piston seal seat
The first oil duct is provided with chamber central, the rear end of the first oil duct passes through the rear end face and first hydraulic cylinder of first hydraulic cylinder piston rod
Cavity communicate, between the first oil duct and first hydraulic cylinder piston rod formed cavity be the first oil pocket, first hydraulic cylinder piston
The first hydraulic fluid port, the second hydraulic fluid port and the second oil duct are offered on the block head of bar front end, the first hydraulic fluid port is communicated with the first oil duct, second
Hydraulic fluid port is connected by the second oil duct with the first oil pocket, and the first hydraulic fluid port is communicated on the cylinder body of second hydraulic cylinder by the first oil pipe
The 3rd hydraulic fluid port, the second hydraulic fluid port is communicated in the 4th hydraulic fluid port on the cylinder body of second hydraulic cylinder, the 3rd hydraulic fluid port by the second oil pipe
The rear of the second hydraulic cylinder piston rod in second hydraulic cylinder cylinder body, the 4th hydraulic fluid port are in second hydraulic cylinder piston rod afterbody
Front.
As a further improvement on the present invention, the both sides up and down of the first hydraulic cylinder rear end of the cylinder block inner surface form direction
The chamfering of 30 ° of the 3rd oil duct, is easy to the fuel feeding for pushing oil-feed port to enter the 3rd oil duct, then the oil ducts of Jing the 3rd flow to the second oil pocket
It is interior to promote mobile envelope block to move forward stop oilhole.
As a further improvement on the present invention, mobile envelope block is provided with second oil pocket, first hydraulic cylinder piston rod faces
The front of nearly oilhole forms dogging shoulder, and mobile envelope block is between dogging shoulder and piston seal seat, and level is offered on piston seal seat
The 3rd oil duct communicated with the cavity of first hydraulic cylinder.What push first hydraulic cylinder piston rod and second hydraulic cylinder piston rod stretched out
During, oilhole is blocked by mobile envelope block, prevent the hydraulic oil in second hydraulic cylinder cylinder body from carrying out oil return, at the same also avoid because
The oil return of second hydraulic cylinder causes the resistance that first hydraulic cylinder piston rod stretches out.
As a further improvement on the present invention, the sealing shroud is the taper sheath that outer surface becomes narrow gradually from the front to the back, from
And make there is gap between the tail end of sealing shroud and the cylinder body of first hydraulic cylinder, and then enable hydraulic oil to pass through retraction oil-feed port
Enter in the second oil pocket, so that first hydraulic cylinder piston rod and second hydraulic cylinder piston rod are retracted.
The invention has the beneficial effects as follows：The present invention, when being pushed, is led to by arranging mobile envelope block in the second oil pocket
Cross move envelope closure of the block to oilhole make hydraulic oil in second hydraulic cylinder cannot oil return and formed to second hydraulic cylinder piston rod
The resistance for stretching out, until first hydraulic cylinder piston rod reach its cylinder body foremost when, mobile envelope block is in sealing shroud tail end
It is moved rearwards by under extruding, the hydraulic oil in second hydraulic cylinder just carries out oil return and releases the resistance stretched out to second hydraulic cylinder piston rod
Power, so as to allow second hydraulic cylinder piston rod to stretch out again after first hydraulic cylinder piston rod stretches out, that is, realizes two piston rods
Order is stretched out；When being retracted, the hydraulic oil part that Jing retractions oil-feed port is entered in the second oil pocket promote mobile envelope block to
Move afterwards to promote first hydraulic cylinder piston rod to be moved rearwards by retracting, because mobile envelope block is moved rearwards by oilhole is exposed, enter
Another part hydraulic oil in second oil pocket is finally flowed in second hydraulic cylinder by oilhole, promotes second hydraulic cylinder piston rod backward
Mobile, now the piston rod of two hydraulic cylinders completes to retract according to the size of setting resistance, and the little first retraction of resistance, resistance is equal
When retract simultaneously so that two piston rods are realized retracting or order retraction by the requirement of practical application simultaneously.The present invention is passed through
Design is calculated, and can reach the basically identical purpose of the speed for stretching out two piston rods, and makes each piston rod keep sufficiently large
Thrust.
The present invention according to control requirement can two hydraulic cylinders of flexible arrangement position, specially：The cylinder barrel of second hydraulic cylinder
Can be fixed on the piston rod of first hydraulic cylinder, both position relationships can be pushed together on the same line by this kind of mode
One workpiece travels forward, and is capable of achieving the push of ultralong-stroke；Or the cylinder barrel of second hydraulic cylinder is fixed on into the first hydraulic pressure
On the workpiece that the piston rod of cylinder is pushed, both can be arranged above and below, also can left-right situs, can be with according to special case
Front and rear part overlaps, and at the end of first hydraulic cylinder is pushed, pushes another workpiece again by second hydraulic cylinder and travels forward, from
And realize the push of Long travel in the confined space to two workpieces, for example, when material is pushed, first by first hydraulic cylinder
Push a base plate with push pedal to move forward, when base plate reaches range, then pushed on base plate by second hydraulic cylinder
Push pedal is continued to move along, so as to the purpose that the long range realized to two workpieces is pushed.
On the whole, the present invention has when not working and takes up room little, and piston rod can stretch out very Long travel during work
Advantage, under the conditions of ultralong-stroke, can make two piston rod realizations sequentially push, order retraction or while the purpose retracted, goes back
Two workpiece operations can be pushed, using more flexible, applied widely.Further, since the present invention using pure mechanic structure come
The control of sequence of movement is realized, can avoid causing headstock gear and equipment to send out because of the disorder of system electrical equipment or handss operating trouble
Raw situation about interfering, system configuration is optimized, and reliability is greatly improved, and each hydraulic cylinder in cylinder hydraulic system can be made tight
Lattice action successively in a predetermined sequence, and more stable compared with the new sequentially-operating hydraulic cylinder operation using unidirectional valve group technology,
It is reliable.
Description of the drawings：
Fig. 1 is the structural representation of the present invention.
Specific embodiment：
With reference to Fig. 1, the new sequentially-operating hydraulic cylinder, including first hydraulic cylinder 4 and second hydraulic cylinder 10, first liquid
The push oil-feed port 15 communicated with the cavity of first hydraulic cylinder 4, first hydraulic cylinder piston rod are provided with rear end on the cylinder body of cylinder pressure 4
5 are located in the cavity of first hydraulic cylinder 4 by the piston seal seat 1 of its rear end, and the first hydraulic pressure is close in the outside of piston seal seat 1
The second oil pocket 8, first hydraulic cylinder 4 are formed between the cavity of the inner surface of cylinder 4, first hydraulic cylinder piston rod 5 and first hydraulic cylinder 4
Outside of the front end in first hydraulic cylinder piston rod 5 be provided with sealing shroud 13, the sealing shroud 13 be outer surface from the front to the back by
The narrow taper sheath of gradual change, so that having gap, first hydraulic cylinder between the cylinder body of the tail end of sealing shroud 13 and first hydraulic cylinder 4
The retraction oil-feed port 16 communicated with the second oil pocket 8, first hydraulic cylinder piston rod are offered on 4 on the outside of the tail end of sealing shroud 13
Front on 5 in piston seal seat 1 offers oilhole 3, and first hydraulic cylinder piston rod 5 closes on the front of oilhole 3 and forms dogging shoulder,
In being provided with mobile envelope block 2 between dogging shoulder and piston seal seat 1 in second oil pocket 8, level is offered and the on piston seal seat 1
Mobile envelope block 2, first hydraulic cylinder piston rod are provided with the 3rd oil duct 14 that the cavity of one hydraulic cylinder 4 is communicated, second oil pocket 8
5 fronts for closing on oilhole 3 form dogging shoulder, and mobile envelope block 2 is between dogging shoulder and piston seal seat 1, level on piston seal seat 1
Offer the 3rd oil duct 14 communicated with the cavity of first hydraulic cylinder 4, the both sides up and down of the rear end of the cylinder block inner surface of first hydraulic cylinder 4
Form the chamfering of 30 ° towards the 3rd oil duct 14.The internal cavity center of first hydraulic cylinder piston rod 5 is provided with the first oil duct 6,
The rear end of the first oil duct 6 communicates through the rear end face of first hydraulic cylinder piston rod 5 with the cavity of first hydraulic cylinder 4, the first oil duct 6
Between first hydraulic cylinder piston rod 5 formed cavity be the first oil pocket 7, the block head 22 of the front end of first hydraulic cylinder piston rod 5
On offer the first hydraulic fluid port 17, the second hydraulic fluid port 18 and the second oil duct 9, the first hydraulic fluid port 17 is communicated with the first oil duct 6, the second hydraulic fluid port 18
Connected with the first oil pocket 7 by the second oil duct 9, the first hydraulic fluid port 17 is communicated in the cylinder of second hydraulic cylinder 10 by the first oil pipe 23
The 3rd hydraulic fluid port 19 on body, the second hydraulic fluid port 18 by the second oil pipe 12 be communicated on the cylinder body of second hydraulic cylinder 10 it is the 4th oily
Mouthfuls 20, at the rear of second hydraulic cylinder piston rod 11 of the 3rd hydraulic fluid port 19 in the cylinder body of second hydraulic cylinder 10, the 4th hydraulic fluid port 20
In the front of the afterbody of second hydraulic cylinder piston rod 11.
The present invention the course of work be：
Push first hydraulic cylinder piston rod 5 and when the order of second hydraulic cylinder piston rod 11 is stretched out, hydraulic oil is by pushing fuel feeding
In mouthfuls 15 cavitys for entering first hydraulic cylinder 4, to first hydraulic cylinder piston rod 5 rear end and piston seal seat 1 apply forward
Pressure stretches out the forward movement of first hydraulic cylinder piston rod 5, while most of hydraulic oil enters interior, the fraction liquid of the first oil duct 6
The 3rd oil ducts of force feed Jing 14 flow to mobile envelope block 2 and promote mobile envelope block 2 to move ahead and block oilhole 3, into the liquid of the first oil duct 6
Press oil and second hydraulic cylinder is entered by Jing the first oil pipes 23 of the first hydraulic fluid port 17 and the 3rd hydraulic fluid port 19 at the front end of stream to the first oil duct 6
Second hydraulic cylinder piston rod 11 is promoted to move ahead in 10 cylinder body, because oilhole 3 is blocked by mobile envelope block 2, second hydraulic cylinder
Hydraulic oil in 10 on front side of the tail end of second hydraulic cylinder piston rod 11 cannot oil return, so as to second hydraulic cylinder piston rod 11
Stretch out to form resistance, when first hydraulic cylinder piston rod 5 moves to the front end of the cylinder body of first hydraulic cylinder 4, mobile envelope block 2 is in sealing
It is moved rearwards by exposing oilhole 3 under the extruding of set 13, successively Jing the 4th is oily for the hydraulic oil before the tail end of second hydraulic cylinder piston rod 11
The 20, second oil circuit 12 of mouth, the second hydraulic fluid port 18, the second oil duct 9, the first oil pocket 7, oilhole 3 are back in the second oil pocket 8, and it is right to eliminate
The resistance that second hydraulic cylinder piston rod 11 stretches out, the hydraulic oil that now hydraulic fluid ports 19 of Jing the 3rd are entered in second hydraulic cylinder 10 promotes the
Two hydraulic cylinder piston rods 11 stretch out, so as to realize that first hydraulic cylinder piston rod 5 and the order of second hydraulic cylinder piston rod 11 stretch out.
When first hydraulic cylinder piston rod 5 and second hydraulic cylinder piston rod 11 are retracted, hydraulic oil is entered by oil-feed port 16 of retracting
Enter in the cavity of first hydraulic cylinder 4, promote mobile envelope block 2 to be moved rearwards by, and then promote piston seal seat 1 to make first hydraulic cylinder live
Stopper rod 5 is moved rearwards by, at the same hydraulic oil Jing oilholes 3 enter the first oil pocket 7 in, then by the first oil pocket 7 successively the second oil ducts of Jing 9,
Second hydraulic fluid port 18, the second oil pipe 12, the 4th hydraulic fluid port 20 are entered in the cylinder body of second hydraulic cylinder 10, promote second hydraulic cylinder piston
Bar 11 is moved rearwards by, and now two hydraulic cylinder piston rods complete to retract according to the size of setting resistance, the little first retraction of resistance, resistance
Retract simultaneously when power is equal.
Claims (3)
1. a kind of new sequentially-operating hydraulic cylinder, it is characterised in that：Including first hydraulic cylinder (4) and second hydraulic cylinder (10), institute
State and be provided with the push oil-feed port (15) that communicates with the cavity of first hydraulic cylinder (4) in rear end on the cylinder body of first hydraulic cylinder (4),
One hydraulic cylinder piston rod (5) by the piston seal seat (1) of its rear end in the cavity of first hydraulic cylinder (4), piston seal
It is close to the cavity of the inner surface of first hydraulic cylinder (4), first hydraulic cylinder piston rod (5) and first hydraulic cylinder (4) on the outside of seat (1)
Between form the second oil pocket (8), the front end of first hydraulic cylinder (4) is provided with sealing on the outside of first hydraulic cylinder piston rod (5)
Set (13), has gap between the tail end of sealing shroud (13) and the cylinder body of first hydraulic cylinder (4), first hydraulic cylinder is on (4)
The retraction oil-feed port (16) communicated with the second oil pocket (8), first hydraulic cylinder piston rod are offered on the outside of sealing shroud (13) tail end
(5) oilhole (3) is offered in front of piston seal seat (1) on, first hydraulic cylinder piston rod (5) is closed on before oilhole (3)
It is square into dogging shoulder, mobile seal block (2), piston seal seat in being provided between dogging shoulder and piston seal seat (1) in the second oil pocket (8)
(1) level offers the 3rd oil duct (14) communicated with the cavity of first hydraulic cylinder (4) on, first hydraulic cylinder piston rod (5)
Internal cavity center is provided with the first oil duct (6), and the rear end of the first oil duct (6) passes through the rear end of first hydraulic cylinder piston rod (5)
Face communicates with the cavity of first hydraulic cylinder (4), and the cavity formed between the first oil duct (6) and first hydraulic cylinder piston rod (5) is
First oil pocket (7), on the block head (22) of first hydraulic cylinder piston rod (5) front end the first hydraulic fluid port (17), the second hydraulic fluid port are offered
(18) and the second oil duct (9), the first hydraulic fluid port (17) is communicated with the first oil duct (6), the second hydraulic fluid port (18) by the second oil duct (9) with
First oil pocket (7) is connected, and the first hydraulic fluid port (17) is communicated on the cylinder body of second hydraulic cylinder (10) by the first oil pipe (23)
3rd hydraulic fluid port (19), the second hydraulic fluid port (18) is communicated in the 4th on the cylinder body of second hydraulic cylinder (10) by the second oil pipe (12)
Hydraulic fluid port (20), the rear of second hydraulic cylinder piston rod (11) of the 3rd hydraulic fluid port (19) in second hydraulic cylinder (10) cylinder body,
Front of four hydraulic fluid ports (20) in second hydraulic cylinder piston rod (11) afterbody.
2. a kind of new sequentially-operating hydraulic cylinder as claimed in claim 1, it is characterised in that：First hydraulic cylinder (4) cylinder
The both sides up and down of body aft end interior surface form the chamfering of 30 ° towards the 3rd oil duct (14).
3. a kind of new sequentially-operating hydraulic cylinder as claimed in claim 1, it is characterised in that：The sealing shroud (13) is appearance
The taper sheath that face becomes narrow gradually from the front to the back.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510945380.0A CN105370645B (en) | 2015-12-14 | 2015-12-14 | Novel sequential action hydraulic cylinder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510945380.0A CN105370645B (en) | 2015-12-14 | 2015-12-14 | Novel sequential action hydraulic cylinder |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105370645A CN105370645A (en) | 2016-03-02 |
| CN105370645B true CN105370645B (en) | 2017-04-19 |
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ID=55373153
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510945380.0A Active CN105370645B (en) | 2015-12-14 | 2015-12-14 | Novel sequential action hydraulic cylinder |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105370645B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111503088B (en) * | 2020-05-07 | 2022-04-29 | 山东万通液压股份有限公司 | Single-telescopic thrust multiplication hydraulic cylinder |
| CN112627662B (en) * | 2020-12-28 | 2022-12-09 | 北京北方华创微电子装备有限公司 | Semiconductor process equipment and door opening mechanism |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1270494A1 (en) * | 2001-06-18 | 2003-01-02 | FASSI GRU IDRAULICHE S.p.A. | Extension device for telescopic booms of hydraulic cranes |
| CN102518617A (en) * | 2011-12-21 | 2012-06-27 | 湖南特力液压有限公司 | Travel valve, sequential action type combination hydraulic cylinder and hydraulic equipment |
| CN202900830U (en) * | 2012-09-21 | 2013-04-24 | 张海平 | Sequence hydraulic cylinder |
| CN203441860U (en) * | 2013-07-30 | 2014-02-19 | 江苏建筑职业技术学院 | Dual-ejector-rod composite hydraulic cylinder capable of realizing sequential actions |
| CN205207304U (en) * | 2015-12-14 | 2016-05-04 | 黑龙江省农业机械工程科学研究院 | Novel sequence action pneumatic cylinder |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5868507A (en) * | 1981-10-20 | 1983-04-23 | Tadano Tekkosho:Kk | Coupling system for plural hydraulic cylinder |
| JPH10252709A (en) * | 1997-03-17 | 1998-09-22 | Tadano Eng:Kk | Hydraulic expansion device and operation method therefor |
-
2015
- 2015-12-14 CN CN201510945380.0A patent/CN105370645B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1270494A1 (en) * | 2001-06-18 | 2003-01-02 | FASSI GRU IDRAULICHE S.p.A. | Extension device for telescopic booms of hydraulic cranes |
| CN102518617A (en) * | 2011-12-21 | 2012-06-27 | 湖南特力液压有限公司 | Travel valve, sequential action type combination hydraulic cylinder and hydraulic equipment |
| CN202900830U (en) * | 2012-09-21 | 2013-04-24 | 张海平 | Sequence hydraulic cylinder |
| CN203441860U (en) * | 2013-07-30 | 2014-02-19 | 江苏建筑职业技术学院 | Dual-ejector-rod composite hydraulic cylinder capable of realizing sequential actions |
| CN205207304U (en) * | 2015-12-14 | 2016-05-04 | 黑龙江省农业机械工程科学研究院 | Novel sequence action pneumatic cylinder |
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| CN105370645A (en) | 2016-03-02 |
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Effective date of registration: 20220712 Address after: 150081 Heilongjiang Province, Harbin city Nangang District haping Road No. 156 Patentee after: Heilongjiang wunongzhuang Technology Co.,Ltd. Patentee after: Heilongjiang Academy of Agricultural Machinery Engineering Address before: 150081 Heilongjiang Province, Harbin city Nangang District haping Road No. 156 Patentee before: Heilongjiang Province Research Academy of Agricultural Machinery Engineering |