CN103410802A - Pilot operated check valve for excavator hydraulic system - Google Patents
Pilot operated check valve for excavator hydraulic system Download PDFInfo
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- CN103410802A CN103410802A CN2013103499178A CN201310349917A CN103410802A CN 103410802 A CN103410802 A CN 103410802A CN 2013103499178 A CN2013103499178 A CN 2013103499178A CN 201310349917 A CN201310349917 A CN 201310349917A CN 103410802 A CN103410802 A CN 103410802A
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- pilot operated
- check valve
- operated check
- hydraulic system
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Abstract
The invention discloses a pilot operated check valve for an excavator hydraulic system. The pilot operated check valve is characterized by comprising a valve seat, wherein two ends of the valve seat are connected with a sealed screw plug and a valve rod respectively, one end of the sealed screw plug is connected with one end of a piston assembly, the other end of the piston assembly is connected with one end of a nut, the other end of the nut is connected with a first spring seat through a first reset spring, and one end of the valve rod sequentially penetrates through the first spring seat, the first reset spring and the nut to be connected with the other end of the piston assembly. The pilot operated check valve for the excavator hydraulic system has the advantages of being compact in structure, high in reliability, low in energy consumption and cost, small in inner leakage, long in service life and the like.
Description
Technical field
The present invention relates to a kind of excavator hydraulic system Pilot operated check valve, belong to the control valve technical field.
Background technique
Excavator hydraulic system is mainly used in the actuating mechanism of excavating machine control system with Pilot operated check valve, having " supporting " that realize to keep pressure, hydraulic jack, realize hydraulic locking cylinder, flow oil extraction greatly, use Fill valve as and be combined into the effect such as selector valve, is the important component part of excavator control system.The excavator hydraulic system of prior art is with Pilot operated check valve due to complex structure, and machining accuracy and the manufacturability of part are had relatively high expectations, inside let out large, to hydraulic oil control signal low-response, the actuator port pressure surge is larger, shorten the working life of executive component, high energy consumption, cost is high.
Summary of the invention
The technical problem to be solved in the present invention is: provide a kind of compact structure, the high and low energy consumption of reliability, cost low, in let out little, the excavator hydraulic system Pilot operated check valve of pressure and stability of flow, solved the excavator hydraulic system Pilot operated check valve complex structure of prior art, machining accuracy and the manufacturability of part are had relatively high expectations, inside let out large, to hydraulic oil control signal low-response, the actuator port pressure surge is larger, shortens the working life of executive component, high energy consumption, the problem that cost is high.
In order to solve the problems of the technologies described above, technological scheme of the present invention has been to provide a kind of excavator hydraulic system Pilot operated check valve, it is characterized in that, comprise valve seat, the two ends of valve seat are connected with sealing screw plug, valve rod respectively, one end of sealing screw plug is connected with an end of piston assembly, the other end of piston assembly is connected with an end of nut, the other end of nut is connected with the first spring seat by the first Returnning spring, and an end of described valve rod passes successively the first spring seat, the first Returnning spring, nut and is connected with the other end of piston assembly.
Preferably, in the cylindrical groove of described valve seat, be provided with supporting ring and O shape circle.
Preferably, described piston assembly comprises piston, one end of piston is connected with nut, the other end of piston is connected with an end of the second spring seat, between piston and the second spring seat, be provided with the second Returnning spring, in the second spring seat, be provided with fastening piece, an end of fastening piece passes the second spring seat and is located in piston.
Preferably, in the cylindrical groove of described piston, be provided with piston ring.
Preferably, between described piston and the second spring seat, also be provided with large washer.
Preferably, between described fastening piece and the second spring seat, be provided with small washer.
Preferably, described fastening piece is hexagon socket head cap screw.
Compact structure of the present invention, the high and low energy consumption of reliability, cost be low, in let out little, pressure and stability of flow, can effectively extend the working life of executive component, to hydraulic oil control signal response fast and reliable, have take up room little, install and use advantage easy to maintenance and widely used.
The accompanying drawing explanation
Fig. 1 is the structural representation of a kind of excavator hydraulic system with Pilot operated check valve;
Fig. 2 is the structural representation of piston assembly;
Fig. 3 is the hydraulic schematic diagram of a kind of excavator hydraulic system with Pilot operated check valve.
Embodiment
For the present invention is become apparent, hereby with preferred embodiment, and coordinate accompanying drawing to be described in detail below.
The present invention is a kind of excavator hydraulic system Pilot operated check valve, as shown in Figure 1, is the structural representation of a kind of excavator hydraulic system with Pilot operated check valve.It comprises sealing screw plug 1-1, valve seat 1-2, piston assembly 1-3, the first Returnning spring 1-4, nut 1-5, supporting ring 1-6, valve rod 1-7, the first spring seat 1-8, multiple O shape circle 1-9, supporting ring 1-6 and O shape circle 1-9 are installed in the cylindrical groove of valve seat 1-2, the two ends of valve seat 1-2 are connected with sealing screw plug 1-1, valve rod 1-7 respectively, form air-proof condition, play sealing effect.The end of sealing screw plug 1-1 is connected with the end of piston assembly 1-3, the other end of piston assembly 1-3 is connected with the end of nut 1-5, the other end of nut 1-5 is connected with the first spring seat 1-8 by the first Returnning spring 1-4, and the end of valve rod 1-7 passes the first spring seat 1-8 successively, the first Returnning spring 1-4, nut 1-5 are connected with the other end of piston assembly 1-3.
The present invention realizes linear sealing by rounded edge in valve rod 1-7 outer conical surface and valve seat 1-2; By valve seat 1-2, realize that the first spring seat 1-8's is spacing; By the first spring seat 1-8 endoporus, realize the motion guide of valve rod 1-7; The stressed end face of the first Returnning spring 1-4 is provided providing by the first spring seat 1-8; By nut 1-5, realize and valve rod 1-7 fastening; The stressed end face of the first Returnning spring 1-4 is provided providing by nut 1-5; By the first Returnning spring 1-4, realize resetting of valve rod 1-7; By piston assembly 1-3 indirectly-acting, realize the hydraulic oil reverse flow of assembly in valve rod 1-7; 1-9 realizes the oil circuit sealing by O shape circle; By support ring 1-6, realize improving the operating mode oil pressure that assembly is used.
Sealing screw plug 1-1 is threaded and is anchored on valve seat 1-2, coordinates and adopts O shape circle 1-9 and 30 ° of conical surfaces of valve seat 1-2 inner valve stem 1-7 to form seal rings, prevents the hydraulic oil leakage.Seal the socket head screw 2-7 end in screw plug 1-1 contact piston assembly 1-3, indirectly increased original preload pressure of the second Returnning spring 2-6.
Valve seat 1-2 high precision inner-pore has determined the moving direction of piston assembly 1-3.Piston between the assurance of valve seat 1-2 high precision inner-pore and piston assembly 1-3 and piston ring form cylinder oil sealing effect, prevent from controlling hydraulic fluid pressure and descend.
When piston assembly 1-3 resetted, the first Returnning spring 1-4 indirectly-acting, in valve rod 1-7, resetted it, closes the hydraulic oil oil duct.
O shape circle 1-9 is the important component part of assembly sealing fluid force feed, and 1-6 is used in conjunction with supporting ring, is arranged in the cylindrical groove of valve seat 1-2, has improved the oil pressure carried of assembly, has increased the using scope of assembly.
As shown in Figure 1, Figure 3, during use, high pressure oil enters the first hydraulic fluid port 3-2 and acts on valve rod 1-7 potted line top minute outer conical surface, and the effect useful area is the effectively area of circle of potted line.Valve rod 1-7 indirectly-acting the first Returnning spring 1-4, overcome the first Returnning spring 1-4 pretightening force and move down, and valve rod 1-7 outer conical surface is separated rounded edge in valve seat 1-2, and the high pressure oil in the first hydraulic fluid port 3-2 flows into the second hydraulic fluid port 3-3.The high pressure oil pressure decreased, the first Returnning spring 1-4 indirectly-acting valve rod 1-7 moves up, and valve rod 1-7 outer conical surface is near circular edge straight in valve seat 1-2 to contact, and oil duct is closed.
High pressure oil enters the second hydraulic fluid port 3-3 and acts on valve rod 1-7 lower end surface, because rounded edge in valve seat 1-2 is spacing, valve rod 1-7 can't on move.In valve rod 1-7 outer conical surface and valve seat 1-2, rounded edge realizes linear sealing, and the high pressure oil in the second hydraulic fluid port 3-3 can't flow into the first hydraulic fluid port 3-2.
As shown in Figure 2, be the structural representation of piston assembly 1-3.Piston assembly 1-3 comprises piston ring 2-1, piston 2-2, large washer 2-3, small washer 2-4, the second spring seat 2-5, the second Returnning spring 2-6, fastening piece, in the cylindrical groove of piston 2-2, piston ring 2-1 is installed, the end of piston 2-2 is connected with nut 1-5, the other end of piston 2-2 is connected with the end of the second spring seat 2-5, between piston 2-2 and the second spring seat 2-5, the second Returnning spring 2-6 and large washer 2-3 are installed, in the second spring seat 2-5, be provided with fastening piece, one end of fastening piece passes small washer 2-4 successively, the second spring seat 2-5 is fixed in piston 2-2.Fastening piece in the present embodiment is hexagon socket head cap screw 2-7.
Piston ring 2-1 is arranged in piston 2-2 cylindrical groove and forms cylinder oil sealing effect with valve seat 1-2 high precision inner-pore, prevents from controlling hydraulic fluid pressure and descends.Piston 2-2 material matrix is aluminium, lower hardness.Large washer 2-3 has increased the area of contact with piston 2-2, has avoided the second Returnning spring 2-6 directly with piston 2-2, to contact.Small washer 2-4 has determined that hexagon socket head cap screw 2-7 top is higher than the second spring seat 2-5 top, avoids the second spring seat 2-5 endoporus can't oil-feed and affect the normal operation of piston assembly 1-3.Hexagon socket head cap screw 2-7 selection standard spare, tensile strength is large, has effectively guaranteed the working life of assembly.The spring strength of the second Returnning spring 2-6 directly determined assembly to hydraulic oil control signal speed of response.
During use, piston ring 2-1 is contained in piston 2-2 cylindrical groove and forms cylinder oil sealing effect with valve seat 1-2 high precision inner-pore, and control hydraulic oil enters control port 3-1 and acts on piston 2-2 upper-end surface.Piston 2-2 indirectly overcomes the second Returnning spring 2-6 pretightening force and moves down, promotion nut 1-5 overcomes the related valve rod 1-7 of the first Returnning spring 1-4 pretightening force and moves down, valve rod 1-7 outer conical surface is separated rounded edge in valve seat 1-2, the first hydraulic fluid port 3-2 and the second hydraulic fluid port 3-3 connect, and realize that the hydraulic oil any direction flows.
Claims (7)
1. excavator hydraulic system Pilot operated check valve, it is characterized in that, comprise valve seat (1-2), the two ends of valve seat (1-2) respectively with the sealing screw plug (1-1), valve rod (1-7) connects, one end of sealing screw plug (1-1) is connected with an end of piston assembly (1-3), the other end of piston assembly (1-3) is connected with an end of nut (1-5), the other end of nut (1-5) is connected with the first spring seat (1-8) by the first Returnning spring (1-4), one end of described valve rod (1-7) passes the first spring seat (1-8) successively, the first Returnning spring (1-4), nut (1-5) is connected with the other end of piston assembly (1-3).
2. a kind of excavator hydraulic system Pilot operated check valve as claimed in claim 1, is characterized in that, in the cylindrical groove of described valve seat (1-2), is provided with supporting ring (1-6) and O shape circle (1-9).
3. a kind of excavator hydraulic system Pilot operated check valve as claimed in claim 1, it is characterized in that, described piston assembly (1-3) comprises piston (2-2), one end of piston (2-2) is connected with nut (1-5), the other end of piston (2-2) is connected with an end of the second spring seat (2-5), between piston (2-2) and the second spring seat (2-5), be provided with the second Returnning spring (2-6), in the second spring seat (2-5), be provided with fastening piece, an end of fastening piece passes the second spring seat (2-5) and is located in piston (2-2).
4. a kind of excavator hydraulic system Pilot operated check valve as claimed in claim 3, is characterized in that, in the cylindrical groove of described piston (2-2), is provided with piston ring (2-1).
5. a kind of excavator hydraulic system Pilot operated check valve as claimed in claim 3, is characterized in that, also is provided with large washer (2-3) between described piston (2-2) and the second spring seat (2-5).
6. a kind of excavator hydraulic system Pilot operated check valve as claimed in claim 3, is characterized in that, is provided with small washer (2-4) between described fastening piece and the second spring seat (2-5).
7. a kind of excavator hydraulic system Pilot operated check valve as claimed in claim 6, is characterized in that, described fastening piece is hexagon socket head cap screw (2-7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310349917.8A CN103410802B (en) | 2013-08-12 | 2013-08-12 | Excavator hydraulic system Pilot operated check valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310349917.8A CN103410802B (en) | 2013-08-12 | 2013-08-12 | Excavator hydraulic system Pilot operated check valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103410802A true CN103410802A (en) | 2013-11-27 |
| CN103410802B CN103410802B (en) | 2016-04-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201310349917.8A Active CN103410802B (en) | 2013-08-12 | 2013-08-12 | Excavator hydraulic system Pilot operated check valve |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5617890A (en) * | 1994-09-03 | 1997-04-08 | Robert Bosch Gmbh | Electromagnetically operable pressure-regulation valve |
| JPH11264481A (en) * | 1998-03-16 | 1999-09-28 | Howa Mach Ltd | Pilot check valve and rotary cylinder structure |
| CN1548797A (en) * | 2003-05-20 | 2004-11-24 | 辽阳高新给水设备有限公司 | Slow-opening and fast-closing energy-saving non-return valve |
| WO2010094411A1 (en) * | 2009-02-19 | 2010-08-26 | Luk Lamellen Und Kupplungsbau Beteiligungs Kg | Pilot operated check valve |
| CN202510141U (en) * | 2012-03-31 | 2012-10-31 | 浙江华东矿用设备有限公司 | Hydraulic control one-way valve |
| CN203412838U (en) * | 2013-08-12 | 2014-01-29 | 龙工（上海）精工液压有限公司 | Hydraulic control one-way valve for hydraulic system of excavator |
-
2013
- 2013-08-12 CN CN201310349917.8A patent/CN103410802B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5617890A (en) * | 1994-09-03 | 1997-04-08 | Robert Bosch Gmbh | Electromagnetically operable pressure-regulation valve |
| JPH11264481A (en) * | 1998-03-16 | 1999-09-28 | Howa Mach Ltd | Pilot check valve and rotary cylinder structure |
| CN1548797A (en) * | 2003-05-20 | 2004-11-24 | 辽阳高新给水设备有限公司 | Slow-opening and fast-closing energy-saving non-return valve |
| WO2010094411A1 (en) * | 2009-02-19 | 2010-08-26 | Luk Lamellen Und Kupplungsbau Beteiligungs Kg | Pilot operated check valve |
| CN202510141U (en) * | 2012-03-31 | 2012-10-31 | 浙江华东矿用设备有限公司 | Hydraulic control one-way valve |
| CN203412838U (en) * | 2013-08-12 | 2014-01-29 | 龙工（上海）精工液压有限公司 | Hydraulic control one-way valve for hydraulic system of excavator |
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| Publication number | Publication date |
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| CN103410802B (en) | 2016-04-13 |
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