CN110454458A - A kind of hydraulic re-railing block cylinder rod chamber decompression load releasing valve - Google Patents
A kind of hydraulic re-railing block cylinder rod chamber decompression load releasing valve Download PDFInfo
- Publication number
- CN110454458A CN110454458A CN201910864584.XA CN201910864584A CN110454458A CN 110454458 A CN110454458 A CN 110454458A CN 201910864584 A CN201910864584 A CN 201910864584A CN 110454458 A CN110454458 A CN 110454458A
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- Prior art keywords
- valve
- oil
- drain charge
- hydraulic
- load releasing
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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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- 230000006837 decompression Effects 0.000 title claims abstract description 42
- 230000009471 action Effects 0.000 claims abstract description 4
- 210000000664 rectum Anatomy 0.000 claims description 4
- 240000002853 Nelumbo nucifera Species 0.000 claims description 2
- 235000006508 Nelumbo nucifera Nutrition 0.000 claims description 2
- 235000006510 Nelumbo pentapetala Nutrition 0.000 claims description 2
- 239000003921 oil Substances 0.000 abstract description 84
- 239000010720 hydraulic oil Substances 0.000 abstract description 6
- 230000003247 decreasing effect Effects 0.000 abstract description 3
- 230000004044 response Effects 0.000 abstract description 3
- 230000006378 damage Effects 0.000 description 7
- 239000000446 fuel Substances 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 239000012208 gear oil Substances 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 230000002427 irreversible effect Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 206010020852 Hypertonia Diseases 0.000 description 1
- 206010040007 Sense of oppression Diseases 0.000 description 1
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000000306 component Substances 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000001066 destructive effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 210000003811 finger Anatomy 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000003595 mist Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 210000003813 thumb Anatomy 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61K—AUXILIARY EQUIPMENT SPECIALLY ADAPTED FOR RAILWAYS, NOT OTHERWISE PROVIDED FOR
- B61K5/00—Apparatus for placing vehicles on the track; Derailers; Lifting or lowering rail vehicle axles or wheels
- B61K5/04—Devices secured to the track
- B61K5/06—Derailing or re-railing blocks
-
- 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
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/025—Pressure reducing valves
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Engineering & Computer Science (AREA)
- Actuator (AREA)
Abstract
The present invention provides a kind of hydraulic re-railing block cylinder rod chambers to depressurize load releasing valve, including valve body, drain charge chamber is provided in the valve body, drain charge is intracavitary to be disposed with screw, spring, valve rod, the end that the end of screw extends to valve body is connect with nut thread, spring one end offsets with screw, the other end offsets with valve rod, the front end of valve body is axially disposed the decompression drain charge valve port being connected to drain charge chamber, in oil cylinder in the normal situation of oil pressure, valve rod closes decompression drain charge valve port under the action of the spring, the middle part of sliding channel of valve body radially offers the oil leak hole being connected to drain charge chamber.By a small amount of hydraulic oil that leaks after decompression load releasing valve triggering of the present invention, in-cylinder pressure, which is slightly decreased, to be stopped, and is swift in response, and common unloading way is then that cylinder pressure is thoroughly down to zero, needs the regular hour.
Description
Technical field
The invention belongs to oil cylinder accessories fields, depressurize load releasing valve more particularly, to a kind of hydraulic re-railing block cylinder rod chamber.
Background technique
The hydraulic re-railing block core component that multiple oil cylinder is vehicle off-line rescue is played, multiple oil cylinder meeting during normal is played
It breaks down, damage that these failures are generally from the aging oil leak of sealing element and the machinery of appearance collides with.But most failures are
Hydraulic system from oil cylinder front end, including oil pump, control valve, oil pipe, connector etc. go wrong, and the influence caused by oil cylinder is logical
Be often not fuel feeding, fuel feeding it is unsmooth, it is fuel-displaced be obstructed, first two situation does not constitute destructive injury still to oil cylinder, only fuel-displaced to be obstructed
After can make oil cylinder interior cylinder pressure moment sharply increase, oil seal failure；Especially to the re-railing block oil cylinder for having super-pressure, frivolous feature
Oil sealing damage is never only terminated in, cylinder barrel deforms the cylinder that rises, internal oil channel breakage is scrapped and is difficult to avoid that.And fuel-displaced be obstructed has generally comprised
Rod cavity oil circuit is obstructed to be obstructed with rodless cavity oil circuit, but the former occurrence probability is far more than the latter；The reason is that being all first when working initial
To rodless cavity oiling to allow piston to move up, if rodless cavity oil circuit is obstructed, hydraulic oil does not enter oil cylinder, just not will form cylinder
Pressure, piston just has no movement can also cause operator's vigilance immediately, shut down investigation.But when rod chamber oil circuit is obstructed and without bar
When chamber oil circuit is unimpeded, hydraulic oil enters rodless cavity as usual, can the oil of rod chamber have nowhere to go, piston will stagnate i.e. piston or more
Two cavity pressures balance；The area of the effective piston of usual rod chamber only has the part of rodless cavity piston area, thus has
Rod cavity pressure moment can soar to the several times of rodless cavity oil pressure, up to several hundred MPa, and such high pressure is enough that oil cylinder is made to entirely collapse.
Because occurring in moment, operator can react at all, so damage is substantially irreversible, avoids oil cylinder in these cases
It is technical problem urgently to be resolved in the industry that hypertonia, which causes damage,.
Summary of the invention
In view of this, the present invention is directed to propose a kind of hydraulic re-railing block cylinder rod chamber depressurizes load releasing valve, to solve oil pressure
Excessively high the technical issues of causing oil cylinder to damage.
In order to achieve the above objectives, the technical scheme of the present invention is realized as follows:
A kind of hydraulic re-railing block cylinder rod chamber depressurizes load releasing valve, including valve body, is provided with drain charge chamber, institute in the valve body
State that drain charge is intracavitary to be disposed with screw, spring, valve rod, the end of the screw extends to the end of valve body and nut thread connects
It connects, the spring one end offsets with screw, and the other end offsets with valve rod, and the front end of the valve body is axially disposed to be had and drain charge chamber
The decompression drain charge valve port of connection, in oil cylinder in the normal situation of oil pressure, the valve rod is closed decompression under the action of the spring and is let out
Lotus valve port, the middle part of sliding channel of the valve body radially offer the oil leak hole being connected to drain charge chamber.
Further, oil scraper ring, the oil scraper ring and valve body clearance fit, the gear oil are arranged in the middle part of the valve body
Ring cover depressurizes drain charge valve port.
Further, the gap of the oil scraper ring and valve outer surface is not more than 0.2mm.
Further, the valve body is followed successively by linkage section, draining section and main paragraph by front end to end, and the linkage section is used
It is connect in the rod chamber with oil cylinder, the decompression drain charge valve port is opened in draining section, and the outer surface of the main paragraph is in hexagon.
Further, the outer surface of the linkage section is equipped with external screw thread, is provided with interior spiral shell engaged therewith on the oil cylinder
Line.
Further, the outer diameter of the main paragraph is greater than the outer diameter of draining section.
Further, one end of the valve rod towards decompression drain charge valve port is centrum, the minimum longitudinal section of the centrum
Area is less than the area of the longitudinal section of decompression drain charge valve port.
Further, the latus rectum of the decompression drain charge valve port is 3mm.
Further, the overall weight of the load releasing valve is not more than 50g.
Compared with the existing technology, hydraulic re-railing block cylinder rod chamber decompression load releasing valve of the present invention has following excellent
Gesture:
(1) decompression load releasing valve decompression result of the present invention is more efficient: few by leaking after the triggering of this decompression load releasing valve
Hydraulic oil is measured, in-cylinder pressure, which is slightly decreased, to be stopped, it is swift in response, and common unloading way is then that cylinder pressure is thoroughly down to zero,
Need the regular hour.
(2) decompression load releasing valve of the present invention increases the safety coefficient of oil cylinder: the setting value for triggering pressure reducing valve, which is higher than, to be had
Rod cavity real work needs, well below enabling oil seal failure and internal oil channel be damaged critical pressure.
(3) decompression drain charge response valve of the present invention is fast.The threshold sensitivity of valve port switch in 2~3MPa or so,
The oily time escape in seconds；When opening, there is a small amount of hydraulic oil to escape, destroy the balance of original oil pressure in cylinder, once oil pressure is slightly
Decline, then valve port is instantaneously automatically closed.
(4) decompression load releasing valve of the present invention is environmentally friendly: real oil cylinder can generate high pressure, continuous when leaking
A large amount of misty fuel injection events (injection process for the initiation that leaks can just stop when intracavitary storage oil pressure is down to atmospheric pressure), it is dirty
Contaminate environment；The oil spilling of this decompression load releasing valve has a small amount of, intermittent pulse characteristic, alarm while preventing oil cylinder impaired；Ease
In cylinder surface where hydraulic fluid port, it is cased with the device of similar finger ring, is stopped by it, high pressure oil can only be escaped on a small quantity in a manner of permeability
Out, it will not go the splash that nebulizes, bring disaster to ambient enviroment and operator.
(5) decompression load releasing valve compact of the present invention: valve body outer dimension is not more than the thumb of ordinary people, insufficient
50 grams, valve outer surface is in hexagon, and general tool dismounting can be used in hexagon valve body, and maintenance replacement is simple and easy.
(6) the great economic benefit of decompression load releasing valve of the present invention: after loading onto decompression load releasing valve, due to intracavitary oil
The irreversible damage of oil cylinder caused by height is pressed through, can substantially be prevented.
Detailed description of the invention
The attached drawing for constituting a part of the invention is used to provide further understanding of the present invention, schematic reality of the invention
It applies example and its explanation is used to explain the present invention, do not constitute improper limitations of the present invention.In the accompanying drawings:
Fig. 1 is the schematic internal view that hydraulic re-railing block cylinder rod chamber depressurizes load releasing valve described in the embodiment of the present invention；
Fig. 2 is that hydraulic re-railing block cylinder rod chamber described in the embodiment of the present invention depressurizes load releasing valve scheme of installation.
Description of symbols:
10, valve body；11, oil leak hole；12, external screw thread；13, valve rod；14, drain charge valve port is depressurized；15, nut；16, screw；
17, spring；18, oil scraper ring；19, handle；20, rod chamber ready-packaged joint.
Specific embodiment
It should be noted that in the absence of conflict, the feature in embodiment and embodiment in the present invention can phase
Mutually combination.
In the description of the present invention, it is to be understood that, term " center ", " longitudinal direction ", " transverse direction ", "upper", "lower",
The orientation or positional relationship of the instructions such as "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outside" is
It is based on the orientation or positional relationship shown in the drawings, is merely for convenience of description of the present invention and simplification of the description, rather than instruction or dark
Show that signified device or element must have a particular orientation, be constructed and operated in a specific orientation, therefore should not be understood as pair
Limitation of the invention.In addition, term " first ", " second " etc. are used for description purposes only, it is not understood to indicate or imply phase
To importance or implicitly indicate the quantity of indicated technical characteristic.The feature for defining " first ", " second " etc. as a result, can
To explicitly or implicitly include one or more of the features.In the description of the present invention, unless otherwise indicated, " multiple "
It is meant that two or more.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " installation ", " phase
Even ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected；It can
To be mechanical connection, it is also possible to be electrically connected；It can be directly connected, can also can be indirectly connected through an intermediary
Connection inside two elements.For the ordinary skill in the art, above-mentioned term can be understood by concrete condition
Concrete meaning in the present invention.
The present invention will be described in detail below with reference to the accompanying drawings and embodiments.
Refering to fig. 1, a kind of hydraulic re-railing block cylinder rod chamber of the present invention depressurizes load releasing valve, including valve body 10, valve
Drain charge chamber is provided in body 10, drain charge is intracavitary to be disposed with screw 16, spring 17, valve rod 13, and the end of screw 16 extends to
The end of valve body 10 is threadedly coupled with nut 15, and 17 one end of spring offsets with screw 16, and the other end offsets with valve rod 13, valve body 10
Front end axially disposed have the decompression drain charge valve port 14 being connected to drain charge chamber.The middle part of sliding channel of valve body 10 radially offer with
The oil leak hole 11 of drain charge chamber connection.
Screw 16 is used to adjust the pressure to valve rod 13 of spring 17, and the oil pressure for flowing through decompression drain charge valve port 14, which is greater than, to be limited
When value, valve rod 13 is open, and the intracavitary hydraulic oil of oil cylinder is discharged through decompression drain charge valve port 14, oil leak hole 11.17 pressure tune of spring
After fixed, screw 16 is locked by nut 15.
In oil cylinder in the normal situation of oil pressure, valve rod 13 closes decompression drain charge valve port 14, tool under the action of spring 17
Body, the latus rectum of decompression drain charge valve port 14 is 3mm.One end of valve rod 13 towards decompression drain charge valve port 14 is centrum, and centrum is most
The area of small longitudinal section is less than the area of the longitudinal section of decompression drain charge valve port 14.When spring 17 pressurizes postcentrum always to valve rod 13
In partial insertion oil leak hole 11.
The middle part of valve body 10 is arranged with oil scraper ring 18, oil scraper ring 18 and 10 clearance fit of valve body, and the covering of oil scraper ring 18 subtracts
Press drain charge valve port 14.The gap of oil scraper ring 18 and 10 outer surface of valve body is not more than 0.2mm.To prevent pressure oil from flowing through oil leak hole 11
High pressure mist splash when out before valve body 10 is installed on oil cylinder, covers a upper oil scraper ring 18, oil scraper ring 18 outside oil leak hole 11
It is not more than 0.2mm with cylindric 10 gap of valve body, the pressure oil of ejection can only be from 18 both ends of oil scraper ring to drip, seep after being stopped by it
Form evolution.After a small amount of ease oil, cylinder pressure is slightly decreased the decompression drain charge valve port 14 that can trigger decompression load releasing valve by spring 17
Valve rod 13 under compressing is closed.Valve body 10 is followed successively by linkage section, draining section and main paragraph by front end to end, linkage section be used for
The rod chamber of oil cylinder connects, and decompression drain charge valve port 14 is opened in draining section, and the outer surface of main paragraph is in hexagon.To guarantee gear oil
Drain charge valve port 14 is depressurized in covering to ring 18 always in use, sets outer slightly larger than draining section for the outer diameter of main paragraph
Diameter guarantees that oil scraper ring 18 will not glide.
The rod chamber of the load releasing valve and hydraulic re-railing block oil cylinder is connected through a screw thread, it can be achieved that fast assembling-disassembling specifically connects
The outer surface for connecing section is equipped with external screw thread 12, is provided with internal screw thread engaged therewith on oil cylinder.Certainly, in the premise for not considering dismounting
Under, load releasing valve and oil cylinder can also take the dismounting modes such as welding.
Referring to Fig.2, valve body 10 of the invention is made of 16# hexagonal bar shape extrusion, main paragraph is in hexagon, is suitble to make
It is dismounted with commercially available spanner, decompression load releasing valve is attempted by 20 side of rod chamber ready-packaged joint when installation, without departing from original oil cylinder
Gabarit range including handle 19, no matter oil cylinder is vertical or tilting when operation, will not all send out with position any on car body
Raw interference, entire valve body 10 only have adult thumbnail size, and the not super 50g of weight.
In actual use, decompression lets out valve port cracking pressure and is set as 30MPa, can usually meet rod chamber oil completely
Pressure shrinks the function of piston, and, internal oil channel breakdown lower than oil sealing suffers oppression the critical value of collapse.Depressurize the latus rectum of drain charge valve port 14
It is set as Φ 3mm, oil pressure changes in 2MPa, acts on the thrust variation on spring 17 up to 5kg or more, it is sufficient to which influence subtracts
The folding of drain charge valve port 14 is pressed, and can be opened repeatedly with the fuctuation within a narrow range of oil pressure, is responded rapidly to.
The drain charge mode that decompression load releasing valve of the invention only passes through " stopping after getting a little knowledge of a subject or about sth. " reduces cylinder pressure, is different from the prior art
The drain charge of " one rushes down on earth ".
The precision and service life of decompression load releasing valve of the present invention depend on the material of 17 mass of spring, valve port component
Matter, machining accuracy still belong to controllable, substantially can be with oil cylinder equivalent life.It is tested, seals on experimental bench before being dispatched from the factory in the form of assembly
Dress, can be with fast assembling-disassembling when periodically returning factory's detection.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Within mind and principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (9)
1. a kind of hydraulic re-railing block cylinder rod chamber depressurizes load releasing valve, it is characterised in that: including valve body, be provided in the valve body
Drain charge chamber, the drain charge is intracavitary to be disposed with screw, spring, valve rod, the end of the screw extend to the end of valve body with
Nut thread connection, the spring one end offset with screw, and the other end offsets with valve rod, and the front end of the valve body is axially disposed
There is the decompression drain charge valve port being connected to drain charge chamber, in oil cylinder in the normal situation of oil pressure, the valve rod is under the action of the spring
Closing decompression drain charge valve port, the middle part of sliding channel of the valve body radially offer the oil leak hole being connected to drain charge chamber.
2. hydraulic re-railing block cylinder rod chamber according to claim 1 depressurizes load releasing valve, it is characterised in that: the valve body
Middle part is arranged with oil scraper ring, the oil scraper ring and valve body clearance fit, the oil scraper ring covering decompression drain charge valve port.
3. hydraulic re-railing block cylinder rod chamber according to claim 2 depressurizes load releasing valve, it is characterised in that: the oil scraper ring
It is not more than 0.2mm with the gap of valve outer surface.
4. hydraulic re-railing block cylinder rod chamber according to claim 1 depressurizes load releasing valve, it is characterised in that: the valve body by
Front end to end is followed successively by linkage section, draining section and main paragraph, and the linkage section is described to subtract for connecting with the rod chamber of oil cylinder
Pressure drain charge valve port is opened in draining section, and the outer surface of the main paragraph is in hexagon.
5. hydraulic re-railing block cylinder rod chamber according to claim 4 depressurizes load releasing valve, it is characterised in that: the linkage section
Outer surface be equipped with external screw thread, be provided with internal screw thread engaged therewith on the oil cylinder.
6. hydraulic re-railing block cylinder rod chamber according to claim 3 depressurizes load releasing valve, it is characterised in that: the main paragraph
Outer diameter be slightly larger than draining section outer diameter.
7. hydraulic re-railing block cylinder rod chamber according to claim 1 depressurizes load releasing valve, it is characterised in that: the valve rod court
One end to decompression drain charge valve port is centrum, and the area of the minimum longitudinal section of the centrum is less than the longitudinal section of decompression drain charge valve port
Area.
8. hydraulic re-railing block cylinder rod chamber according to claim 1 depressurizes load releasing valve, it is characterised in that: the decompression is let out
The latus rectum of lotus valve port is 3mm.
9. hydraulic re-railing block cylinder rod chamber according to claim 1 depressurizes load releasing valve, it is characterised in that: the load releasing valve
Overall weight be not more than 50g.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910864584.XA CN110454458A (en) | 2019-09-12 | 2019-09-12 | A kind of hydraulic re-railing block cylinder rod chamber decompression load releasing valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910864584.XA CN110454458A (en) | 2019-09-12 | 2019-09-12 | A kind of hydraulic re-railing block cylinder rod chamber decompression load releasing valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110454458A true CN110454458A (en) | 2019-11-15 |
Family
ID=68491890
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910864584.XA Pending CN110454458A (en) | 2019-09-12 | 2019-09-12 | A kind of hydraulic re-railing block cylinder rod chamber decompression load releasing valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110454458A (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1594897A (en) * | 2004-06-29 | 2005-03-16 | 北汽福田汽车股份有限公司 | Self-protection large gear ratio hydraulic cylinder |
| CN201934661U (en) * | 2010-12-02 | 2011-08-17 | 广州柴油机厂股份有限公司 | Oil retaining sealing structure arranged at front end of rotating shaft |
| CN103062148A (en) * | 2013-01-30 | 2013-04-24 | 浙江海克力液压有限公司 | Energy-saving type prior unloading valve |
| CN203374967U (en) * | 2013-07-16 | 2014-01-01 | 宁波海宏液压有限公司 | Remote control overflow valve |
| CN105134681A (en) * | 2015-10-08 | 2015-12-09 | 杭州力龙液压有限公司 | One-way cushion overflow valve and closed-type hydraulic pump |
| CN205173042U (en) * | 2015-12-09 | 2016-04-20 | 新昌县亿源精密机械有限公司 | Bearing seat of fan |
| CN207131656U (en) * | 2017-09-04 | 2018-03-23 | 阜新北星液压有限公司 | Gear pump constant-flow relief valve |
| CN210769609U (en) * | 2019-09-12 | 2020-06-16 | 天津华征机械制造有限公司 | Rod cavity pressure reducing and load releasing valve of hydraulic rerailer oil cylinder |
-
2019
- 2019-09-12 CN CN201910864584.XA patent/CN110454458A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1594897A (en) * | 2004-06-29 | 2005-03-16 | 北汽福田汽车股份有限公司 | Self-protection large gear ratio hydraulic cylinder |
| CN201934661U (en) * | 2010-12-02 | 2011-08-17 | 广州柴油机厂股份有限公司 | Oil retaining sealing structure arranged at front end of rotating shaft |
| CN103062148A (en) * | 2013-01-30 | 2013-04-24 | 浙江海克力液压有限公司 | Energy-saving type prior unloading valve |
| CN203374967U (en) * | 2013-07-16 | 2014-01-01 | 宁波海宏液压有限公司 | Remote control overflow valve |
| CN105134681A (en) * | 2015-10-08 | 2015-12-09 | 杭州力龙液压有限公司 | One-way cushion overflow valve and closed-type hydraulic pump |
| CN205173042U (en) * | 2015-12-09 | 2016-04-20 | 新昌县亿源精密机械有限公司 | Bearing seat of fan |
| CN207131656U (en) * | 2017-09-04 | 2018-03-23 | 阜新北星液压有限公司 | Gear pump constant-flow relief valve |
| CN210769609U (en) * | 2019-09-12 | 2020-06-16 | 天津华征机械制造有限公司 | Rod cavity pressure reducing and load releasing valve of hydraulic rerailer oil cylinder |
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