CN109882467A - A kind of hydraulic cylinder safety valve and its application - Google Patents
A kind of hydraulic cylinder safety valve and its application Download PDFInfo
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- CN109882467A CN109882467A CN201910289921.7A CN201910289921A CN109882467A CN 109882467 A CN109882467 A CN 109882467A CN 201910289921 A CN201910289921 A CN 201910289921A CN 109882467 A CN109882467 A CN 109882467A
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Abstract
The invention discloses a kind of hydraulic cylinder safety valve and its application, including valve body, it is equipped with the first valve opening and the second valve opening side by side in the valve body；The right end of first valve opening is equipped with the first plug, left end is equipped with spill valve；The check valve assembly for controlling the second intercommunicating pore and the first valve opening on-off is equipped in the valve body；The valve body is equipped with the V hydraulic fluid port being connected to the second intercommunicating pore, and the C hydraulic fluid port being connected to the first valve opening；The first valve pocket is plugged in second valve opening, the left end of second valve opening is threaded with the second valve pocket；Main valve plug is slidably connected in first valve pocket, the right end of second valve opening is equipped with third valve pocket, forms right control chamber between the right end and the second plug of main valve plug in the third valve pocket；It is equipped with connecting rod in second valve pocket, is equipped with pilot valve in the third oilhole；The hydraulic cylinder safety valve structure is simple, hydraulic cylinder can be made to be held in place, and can reliably absorb impact overflow, and manufacturing cost is low.
Description
Technical field
The present invention relates to technical field of hydraulic elements, in particular to a kind of hydraulic cylinder safety valve and its applications.
Background technique
The engineering mechanical devices such as conventional excavator, autocrane, telescopic boom fork truck, their large arm hydraulic cylinder
Directly it is connected with multi-way valve, the up and down and holding of large arm hydraulic cylinder is controlled by multi-way valve.For example, hydraulic crawler excavator
After scraper bowl is lifted off ground, the reversal valve of large arm or dipper hydraulic cylinder may be controlled for various reasons returning briefly to middle position, and
Engine is in idling mode again at this time, at this moment if the gap between the spool and valve body of reversal valve is excessive, there is leakage, i.e.,
Make hydraulic cylinder non-internal leakage, equipment can also decline automatically under Gravitative Loads.When the built-in full with substance of scraper bowl or on scraper bowl
When suspension hook slings weight, equipment declines automatically often to lead to a disaster.Meanwhile when oil pipe burst occur, large arm can go out
There are security risks for now unexpected decline.
Summary of the invention
(1) technical problems to be solved
The purpose of the present invention is to overcome the above shortcomings and to provide a kind of hydraulic cylinder safety valve and its in hydraulic cylinder operating system
In application.
(2) technical solution
To achieve the above object, the invention provides the following technical scheme:
A kind of hydraulic cylinder safety valve, including valve body are equipped with perforative first valve opening and the second valve opening in the valve body side by side；
The right end of first valve opening is equipped with the first plug, left end is equipped with spill valve, the oil inlet of the spill valve
It is connected to the first valve opening, the oil outlet of the spill valve is connected to by the first intercommunicating pore with the second valve opening；In the valve body
Be equipped with equipped with the second intercommunicating pore for being connected to the first valve opening and the second valve opening, in the valve body for control the second intercommunicating pore with
The check valve assembly of first valve opening on-off；The third connecting for being connected to the first valve opening and the second valve opening is equipped in the valve body
Hole；The valve body is equipped with the V hydraulic fluid port being connected to the second intercommunicating pore, and the C hydraulic fluid port being connected to the first valve opening；
It is plugged with the first valve pocket in second valve opening, the left end of second valve opening is threaded with for by the first valve
Cover the second valve pocket being pressed in the second valve opening；First valve pocket is equipped with for being connected to V hydraulic fluid port and the first valve pocket inner hole
First oil-through-hole slidably connects the main valve for controlling the first valve pocket inner hole Yu third connecting hole on-off in first valve pocket
Core, the interior right end in the second valve opening of the valve body is equipped with threaded hole, forms shoulder between the threaded hole and the second valve opening, described
The right end of second valve opening is equipped with the third valve pocket for the insertion of main valve plug right end, and the circumference side of the third valve pocket is equipped with
With the chimb of shoulder cooperation, the threaded hole internal screw thread is connected with the second plug for being pressed on chimb on shoulder, described
Right control chamber is formed between the right end and the second plug of main valve plug in third valve pocket；
It is equipped with connecting rod in second valve pocket, is successively arranged the first oilhole, the second oil in the connecting rod from left to right
Hole, third oilhole, the connecting rod are equipped with the 6th oil-through-hole for being connected to the first oilhole and the second valve pocket inner hole, Yi Jiyong
In the second oil-through-hole of connection the second oilhole and the second valve pocket inner hole；The third oilhole is threadedly coupled with the left end of main valve plug,
It is equipped in the third oilhole across the second oilhole and the pilot valve in the first oilhole is protruded into left end, set in the third oilhole
There is the first spring for forcing the pilot valve to be pressed on the second oilhole right end；Top is slidably connected in first oilhole
Bar；It is equipped in second valve pocket for forcing the main valve plug to be pressed on the at the first valve pocket right-end openings by connecting rod
Two springs；
The left end of second valve pocket is equipped with X hydraulic fluid port, is slidably connected in second valve pocket in the left end of connecting rod useful
In the control piston for pushing mandril to move right, it is equipped between control piston and the left end of connecting rod for forcing the control
The third spring that piston processed moves downward；Damping hole is set between X hydraulic fluid port and the left end of control piston in second valve pocket；
Left control chamber is formed between the damping hole and the left end for controlling piston, the left control chamber is connected to the first intercommunicating pore；
The valve body is equipped with L hydraulic fluid port, and second valve pocket is equipped with for being connected to L hydraulic fluid port and the second valve pocket inner hole
Three oil-through-holes；The 4th oil-through-hole for being connected to right control chamber and third oilhole is equipped in the main valve plug, and for being connected to
5th oil-through-hole of the 4th oil-through-hole and third connecting hole.
In further technical solution, the connecting rod is equipped with convex shoulder, institute on the circumference side close to its left position
State second spring left end contradict on convex shoulder, right end by spring shim conflict in the left end of the first valve pocket.
Application of the above-mentioned hydraulic cylinder safety valve in hydraulic cylinder operating system, the hydraulic cylinder operating system further includes hydraulic
Cylinder, Y type three position four-way directional control valve, lever assembly, the first overflow valve, the second overflow valve, hydraulic pump, fuel tank and driving liquid
The motor of press pump rotation, the oil inlet of the hydraulic pump is connected to fuel tank, the P hydraulic fluid port of oil outlet and Y type three position four-way directional control valve
Connection, the oil inlet of first overflow valve is connected to the oil outlet of hydraulic pump, oil outlet is connected to fuel tank, three, the Y type
The T hydraulic fluid port of four-way reversing valve is connected to fuel tank, A hydraulic fluid port is connected to the V hydraulic fluid port of hydraulic cylinder safety valve, B hydraulic fluid port and hydraulic cylinder have
Rod cavity connection；The a control port and b control port of the Y type three position four-way directional control valve and the X hydraulic fluid port of hydraulic cylinder safety valve
It is connected to lever assembly；The oil inlet of second overflow valve is connected to the V hydraulic fluid port of hydraulic cylinder safety valve, oil outlet and oil
Case connection；The L hydraulic fluid port of the hydraulic cylinder safety valve is connected to fuel tank, C hydraulic fluid port is connected to the rodless cavity of hydraulic cylinder.
(3) beneficial effect
Compared with prior art, technical solution of the present invention has the advantage that
(1) present invention under the pressure of C hydraulic fluid port hydraulic oil, is applied to main valve by right control chamber when main valve plug is closed
Active force to the left is generated on core and pilot valve, therefore even if second spring, third spring are broken, it will not be to main valve plug
Closing impacts, and also hydraulic cylinder would not be made to cause subsidence accident, high reliablity.
(2) spill valve is directly to be controlled to open by C hydraulic fluid port pressure, and then control pilot valve and main valve plug unlatching,
Can effectively buffering hydraulic cylinder overload impact.
It (3) is all linear sealing when main valve plug and pilot valve are closed, therefore No leakage, hydraulic cylinder will not decline naturally.
Detailed description of the invention
Fig. 1 is structure chart of the invention；
Fig. 2 is the enlarged structure schematic diagram in Fig. 1 at E；
Fig. 3 is the sectional view of connecting rod in the present invention；
Fig. 4 is application principle figure of the invention；
Fig. 5 is application principle figure of the invention.
Specific embodiment
It please refers to shown in Fig. 1-5, a kind of hydraulic cylinder safety valve, including valve body 9, is equipped with side by side in the valve body 9 perforative
First valve opening 9a and the second valve opening 9b；The right end of the first valve opening 9a is equipped with the first plug 7c, left end is equipped with overflow valve
Component 7a, the oil inlet of the spill valve 7a are connected to the first valve opening 9a, and the oil outlet of the spill valve 7a passes through
First intercommunicating pore 9c is connected to the second valve opening 9b；It is equipped in the valve body 9 for being connected to the first valve opening 9a's and the second valve opening 9b
Second intercommunicating pore 9d, the interior check valve assembly being equipped with for controlling the second intercommunicating pore 9d and the first valve opening 9a on-off of the valve body 9
5b；The third connecting hole 9e for being connected to the first valve opening 9a and the second valve opening 9b is equipped in the valve body 9；It is set on the valve body 9
There are the V hydraulic fluid port 901 being connected to the second intercommunicating pore 9d, and the C hydraulic fluid port 902 being connected to the first valve opening 9a.
The first valve pocket 19 is plugged in the second valve opening 9b, the left end of the second valve opening 9b is threaded with for inciting somebody to action
First valve pocket 19 is pressed on the second valve pocket 12 in the second valve opening 9b；First valve pocket 19 is equipped with for being connected to V hydraulic fluid port 901
With the first oil-through-hole 19a of 19 inner hole of the first valve pocket, slidably connect in first valve pocket 19 for controlling the first valve pocket 19
The main valve plug 20 of inner hole and third connecting hole 9e on-off, the interior right end in the second valve opening 9b of the valve body 9 is equipped with threaded hole, described
Shoulder 9f is formed between threaded hole and the second valve opening 9b, the right end of the second valve opening 9b is equipped with to be inserted for 20 right end of main valve plug
The third valve pocket 21 entered, the circumference side of the third valve pocket 21 are equipped with the chimb 21a cooperated with shoulder 9f, the threaded hole
Internal screw thread is connected with the second plug 22 for being pressed on chimb 21a on shoulder 9f, and the third valve pocket 21 is interior in main valve plug
Right control chamber 20a is formed between 20 right end and the second plug 22.
It is equipped with connecting rod 16 in second valve pocket 12, is successively arranged the first oilhole from left to right in the connecting rod 16
16a, the second oilhole 16b, third oilhole 16c, the connecting rod 16 are equipped with for being connected to the first oilhole 16a and the second valve pocket 12
6th oil-through-hole 16d of inner hole, and the second oil-through-hole 16e for being connected to 12 inner hole of the second oilhole 16b and the second valve pocket；Institute
Third oilhole 16c is stated to be threadedly coupled with the left end of main valve plug 20, be equipped in the third oilhole 16c across the second oilhole 16b and
The pilot valve 17 in the first oilhole 16a is protruded into left end, is equipped in the third oilhole 16c for forcing the pilot valve 17
It is pressed on the first spring 5e of the second oilhole 16b right end；Mandril 15 is slidably connected in the first oilhole 16a；Described second
Be used for that the main valve plug 20 to be forced to be pressed at 19 right-end openings of the first valve pocket by connecting rod 16 second is equipped in valve pocket 12
Spring 5d.
The left end of second valve pocket 12 is equipped with X hydraulic fluid port 903, slides in second valve pocket 12 in the left end of connecting rod 16
It is connected with the control piston 14 for pushing mandril 15 to move right, is set between control piston 14 and the left end of connecting rod 16
There is the third spring 5c for forcing the control piston 14 to move downward；In X hydraulic fluid port 903 and control in second valve pocket 12
Damping hole 13a is set between the left end of piston 14；Left control chamber is formed between the damping hole 13a and the left end for controlling piston 14
20b, the left control chamber 20b are connected to the first intercommunicating pore 9c.
The valve body 9 is equipped with L hydraulic fluid port 904, and second valve pocket 12 is equipped with for being connected to L hydraulic fluid port 904 and the second valve
Cover the third oil-through-hole 12a of 12 inner holes；It is equipped in the main valve plug 20 for being connected to right control chamber 20a's and third oilhole 16c
4th oil-through-hole 202, and the 5th oil-through-hole 201 for being connected to the 4th oil-through-hole 202 and third connecting hole 9e.
The connecting rod 16 is equipped with convex shoulder 16f on the circumference side close to its left position, the second spring 5d's
Left end contradicts on convex shoulder 16f, right end is contradicted by spring shim 18 in the left end of the first valve pocket 19.
Application of the above-mentioned hydraulic cylinder safety valve in hydraulic cylinder operating system, the hydraulic cylinder operating system further includes hydraulic
Cylinder 40, Y type three position four-way directional control valve 41, lever assembly 42, the first overflow valve 43, the second overflow valve 44, hydraulic pump 45, fuel tank
46 and the motor 47 that rotates of driving hydraulic pump 45, the oil inlet of the hydraulic pump 45 is connected to fuel tank 46, oil outlet and Y type
The P hydraulic fluid port of three position four-way directional control valve 41 is connected to, and the oil inlet of first overflow valve 43 is connected to the oil outlet of hydraulic pump 45, goes out
Hydraulic fluid port is connected to fuel tank 46, and the T hydraulic fluid port of the Y type three position four-way directional control valve 41 is connected to fuel tank 46, A hydraulic fluid port and hydraulic cylinder are safe
The connection of V hydraulic fluid port 901 of valve, B hydraulic fluid port are connected to the rod chamber of hydraulic cylinder 40；The a of the Y type three position four-way directional control valve 41 controls oil
The X hydraulic fluid port 903 of mouth and b control port and hydraulic cylinder safety valve is connected to lever assembly 42；Second overflow valve 44
Oil inlet be connected to the V hydraulic fluid port 901 of hydraulic cylinder safety valve, oil outlet is connected to fuel tank 46；The L oil of the hydraulic cylinder safety valve
Mouth 904 is connected to fuel tank 46, C hydraulic fluid port 902 is connected to the rodless cavity of hydraulic cylinder 40.
Wherein, when hydraulic cylinder 40 stretches out, by lever assembly 42 hydraulic oil is flowed by V hydraulic fluid port 901, overcomes list
To the active force of valve module 5b, into the rodless cavity of hydraulic cylinder 40, the hydraulic stem in hydraulic cylinder 40 is pushed to stretch out.
When hydraulic cylinder 40 retracts, to control oil into X hydraulic fluid port 903, by damping hole 13a by lever assembly 42
In into left control chamber 20b and be applied to control piston 14 above, push control piston 14 overcome the elastic force of third spring 5c to
Right movement pushes pilot valve 17 by mandril 15, when 903 pressure increase of X hydraulic fluid port is to being enough to overcome the first spring of spring 5e's
When hydraulic oil in elastic force and right control chamber 20a acts on the active force in pilot valve 17, pilot valve 17 is opened, C
The hydraulic oil of hydraulic fluid port 902 is through the first valve opening 9a, third connecting hole 9e, the 5th oil-through-hole 201, the 4th oil-through-hole 202, third oilhole
16c, the second oilhole 16b, the second oil-through-hole 16e, third oil-through-hole 12a flow into L hydraulic fluid port 904 and simultaneously flow into fuel tank 46, during this
Hydraulic cylinder 40 generates slow motion, gentle no impact；903 pressure of X hydraulic fluid port continues to increase, and the opening of pilot valve 17 becomes larger, right
Pressure in control chamber 20a is laid down, while push rod is contacted with connecting rod 16, pushes main valve plug 20 to transport to the right by connecting rod 16
The dynamic active force for overcoming second spring 5d opens the left end opening of 19 inner hole of the first valve pocket, and hydraulic oil is through C hydraulic fluid port 902, the first valve
Cover 19 inner holes, the first oil-through-hole 19a flows into V hydraulic fluid port 901.Wherein pilot pressure determines to arrive first the openings of sizes of main valve plug 20.
When hydraulic cylinder 40 stops, 903 pressure of X hydraulic fluid port is laid down, and pilot valve 17 is in the first spring 5e and right control chamber 20a
It is closed under the action of interior pressure, 902 pressure oil of C hydraulic fluid port is through through the first valve opening 9a, third connecting hole 9e, the 5th oil-through-hole 201,
Four oil-through-holes 202 enter in right control chamber 20a, and under the action of difference in areas, main valve plug 20 is pressed on 19 inner hole of the first valve pocket
Left end opening on, realize reliable inclusion seal.Here main valve plug 20 and pilot valve 17 are all linear sealings, therefore nothing is let out
Leakage, hydraulic cylinder 40 will not retract naturally.
When hydraulic cylinder 40 overloads, the pressure oil of C hydraulic fluid port 902 is applied to above spill valve 7a, by spill valve
7a open, at this time 902 hydraulic oil of C hydraulic fluid port through the first valve opening 9a, the oil inlet of spill valve 7a, spill valve 7a it is fuel-displaced
Mouth, the first intercommunicating pore 9c are entered in left control chamber 20b, and are applied to above control piston 14, and control piston 14 is pushed to overcome
The elastic force of third spring 5c moves right, and pushes pilot valve 17 to open by mandril 15, if 902 pressure of C hydraulic fluid port is excessive, overflows
The opening of valve module 7a is flowed with regard to big, and 17 aperture of pilot valve pushes main valve plug 20 to open with regard to big, realizes relief function.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, without departing from the technical principles of the invention, several improvements and modifications can also be made, these improvements and modifications
Also it should be regarded as protection scope of the present invention.
Claims (3)
1. a kind of hydraulic cylinder safety valve, which is characterized in that including valve body, in the valve body side by side be equipped with perforative first valve opening and
Second valve opening；The right end of first valve opening is equipped with the first plug, left end is equipped with spill valve, the spill valve
Oil inlet be connected to the first valve opening, the oil outlet of the spill valve is connected to by the first intercommunicating pore with the second valve opening；Institute
The second intercommunicating pore being equipped in valve body for being connected to the first valve opening and the second valve opening is stated, is equipped in the valve body for controlling second
The check valve assembly of intercommunicating pore and the first valve opening on-off；The for being connected to the first valve opening and the second valve opening is equipped in the valve body
Tee joint hole；The valve body is equipped with the V hydraulic fluid port being connected to the second intercommunicating pore, and the C hydraulic fluid port being connected to the first valve opening；
It is plugged with the first valve pocket in second valve opening, the left end of second valve opening is threaded with for by the first valve pocket pressure
Tightly the second valve pocket in the second valve opening；First valve pocket is equipped with first for being connected to V hydraulic fluid port and the first valve pocket inner hole
Oil-through-hole slidably connects the main valve plug for controlling the first valve pocket inner hole Yu third connecting hole on-off in first valve pocket,
Threaded hole is equipped in the right end of the second valve opening in the valve body, forms shoulder between the threaded hole and the second valve opening, described the
The right end of two valve openings is equipped with the third valve pocket for the insertion of main valve plug right end, the circumference side of the third valve pocket be equipped with
The chimb of shoulder cooperation, the threaded hole internal screw thread are connected with the second plug for being pressed on chimb on shoulder, and described the
Right control chamber is formed between the right end and the second plug of main valve plug in three valve pockets；
It is equipped with connecting rod in second valve pocket, is successively arranged the first oilhole, the second oilhole, the in the connecting rod from left to right
Three oilholes, the connecting rod are equipped with the 6th oil-through-hole for being connected to the first oilhole and the second valve pocket inner hole, and for connecting
Second oil-through-hole of logical second oilhole and the second valve pocket inner hole；The third oilhole is threadedly coupled with the left end of main valve plug, described
It is equipped in third oilhole across the second oilhole and the pilot valve in the first oilhole is protruded into left end, be equipped with and use in the third oilhole
In the first spring for forcing the pilot valve to be pressed on the second oilhole right end；Mandril is slidably connected in first oilhole；
Be used for forcing that the main valve plug is pressed at the first valve pocket right-end openings by connecting rod second is equipped in second valve pocket
Spring；
The left end of second valve pocket is equipped with X hydraulic fluid port, slidably connects in the left end of connecting rod for pushing away in second valve pocket
The control piston that dynamic mandril moves right is equipped between control piston and the left end of connecting rod for forcing the control to be lived
Fill in the third spring moved downward；Damping hole is set between X hydraulic fluid port and the left end of control piston in second valve pocket；It is described
Left control chamber is formed between damping hole and the left end for controlling piston, the left control chamber is connected to the first intercommunicating pore；
The valve body is equipped with L hydraulic fluid port, and it is logical that second valve pocket is equipped with the third for being connected to L hydraulic fluid port and the second valve pocket inner hole
Oilhole；The 4th oil-through-hole for being connected to right control chamber and third oilhole is equipped in the main valve plug, and for being connected to the 4th
5th oil-through-hole of oil-through-hole and third connecting hole.
2. hydraulic cylinder safety valve according to claim 1, which is characterized in that the connecting rod is close to its left position
Circumference side is equipped with convex shoulder, and the left end of the second spring contradicts on convex shoulder, right end is contradicted by spring shim first
The left end of valve pocket.
3. application of the hydraulic cylinder safety valve according to claim 1 or 2 in hydraulic cylinder operating system, which is characterized in that
The hydraulic cylinder operating system further include hydraulic cylinder, Y type three position four-way directional control valve, lever assembly, the first overflow valve, second overflow
The motor of valve, hydraulic pump, fuel tank and driving hydraulic pump rotation is flowed, the oil inlet of the hydraulic pump is connected to fuel tank, oil outlet
It is connected to the P hydraulic fluid port of Y type three position four-way directional control valve, the oil inlet of first overflow valve is connected to the oil outlet of hydraulic pump, goes out
Hydraulic fluid port is connected to fuel tank, and the T hydraulic fluid port of the Y type three position four-way directional control valve is connected to fuel tank, the V of A hydraulic fluid port and hydraulic cylinder safety valve
Hydraulic fluid port connection, B hydraulic fluid port are connected to the rod chamber of hydraulic cylinder；The a control port of the Y type three position four-way directional control valve and b control oil
The X hydraulic fluid port of mouth and hydraulic cylinder safety valve is connected to lever assembly；The oil inlet and hydraulic cylinder of second overflow valve are pacified
The V hydraulic fluid port connection of full valve, oil outlet are connected to fuel tank；The L hydraulic fluid port of the hydraulic cylinder safety valve is connected to fuel tank, C hydraulic fluid port and liquid
The rodless cavity of cylinder pressure is connected to.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910289921.7A CN109882467B (en) | 2019-04-11 | 2019-04-11 | Hydraulic cylinder safety valve and application thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910289921.7A CN109882467B (en) | 2019-04-11 | 2019-04-11 | Hydraulic cylinder safety valve and application thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109882467A true CN109882467A (en) | 2019-06-14 |
| CN109882467B CN109882467B (en) | 2020-04-03 |
Family
ID=66936983
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910289921.7A Active CN109882467B (en) | 2019-04-11 | 2019-04-11 | Hydraulic cylinder safety valve and application thereof |
Country Status (1)
| Country | Link |
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| CN (1) | CN109882467B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110744999A (en) * | 2019-10-28 | 2020-02-04 | 韩国昊 | Hydraulic differential control system for vehicle |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN87105075A (en) * | 1987-09-02 | 1988-10-12 | 沈阳工业大学 | Differential pressure safety valve for high-pressure large flow |
| JPH02292488A (en) * | 1989-04-29 | 1990-12-03 | Kato Works Co Ltd | Push-in force regulator for kelly-bar in vertical slot excavator |
| CN2219407Y (en) * | 1994-06-16 | 1996-02-07 | 萧山市天新电子仪器厂 | Multifunctional valve |
| CN2477882Y (en) * | 2001-04-29 | 2002-02-20 | 山东工程机械厂 | Multifunctional prefill valve |
| CN102705288A (en) * | 2012-06-19 | 2012-10-03 | 常德中联重科液压有限公司 | Anti-shaking balance valve, telescopic control loop of hydraulic cylinder and hydraulic device |
| CN203098442U (en) * | 2013-01-30 | 2013-07-31 | 浙江海克力液压有限公司 | Energy-saving type priority unloading valve |
| WO2014026798A1 (en) * | 2012-08-13 | 2014-02-20 | Schaeffler Technologies AG & Co. KG | Automatic hydraulic tensioner |
| CN206159579U (en) * | 2016-10-28 | 2017-05-10 | 南京六合煤矿机械有限责任公司 | Pilot -operated type relief valve |
-
2019
- 2019-04-11 CN CN201910289921.7A patent/CN109882467B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN87105075A (en) * | 1987-09-02 | 1988-10-12 | 沈阳工业大学 | Differential pressure safety valve for high-pressure large flow |
| JPH02292488A (en) * | 1989-04-29 | 1990-12-03 | Kato Works Co Ltd | Push-in force regulator for kelly-bar in vertical slot excavator |
| CN2219407Y (en) * | 1994-06-16 | 1996-02-07 | 萧山市天新电子仪器厂 | Multifunctional valve |
| CN2477882Y (en) * | 2001-04-29 | 2002-02-20 | 山东工程机械厂 | Multifunctional prefill valve |
| CN102705288A (en) * | 2012-06-19 | 2012-10-03 | 常德中联重科液压有限公司 | Anti-shaking balance valve, telescopic control loop of hydraulic cylinder and hydraulic device |
| WO2014026798A1 (en) * | 2012-08-13 | 2014-02-20 | Schaeffler Technologies AG & Co. KG | Automatic hydraulic tensioner |
| CN203098442U (en) * | 2013-01-30 | 2013-07-31 | 浙江海克力液压有限公司 | Energy-saving type priority unloading valve |
| CN206159579U (en) * | 2016-10-28 | 2017-05-10 | 南京六合煤矿机械有限责任公司 | Pilot -operated type relief valve |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110744999A (en) * | 2019-10-28 | 2020-02-04 | 韩国昊 | Hydraulic differential control system for vehicle |
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| Publication number | Publication date |
|---|---|
| CN109882467B (en) | 2020-04-03 |
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