CN111594504A - Balance valve for traveling motor and crawler excavator - Google Patents
Balance valve for traveling motor and crawler excavator Download PDFInfo
- Publication number
- CN111594504A CN111594504A CN202010454071.4A CN202010454071A CN111594504A CN 111594504 A CN111594504 A CN 111594504A CN 202010454071 A CN202010454071 A CN 202010454071A CN 111594504 A CN111594504 A CN 111594504A
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- Prior art keywords
- valve
- valve core
- core
- spring
- cavity
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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
- 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
- F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
- F15B13/0401—Valve members; Fluid interconnections therefor
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
- E02F9/22—Hydraulic or pneumatic drives
- E02F9/2264—Arrangements or adaptations of elements for hydraulic drives
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
- E02F9/22—Hydraulic or pneumatic drives
- E02F9/2264—Arrangements or adaptations of elements for hydraulic drives
- E02F9/2267—Valves or distributors
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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
- F15B11/08—Servomotor systems without provision for follow-up action; Circuits therefor with only one servomotor
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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
- 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
- F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
- F15B13/0401—Valve members; Fluid interconnections therefor
- F15B13/0402—Valve members; Fluid interconnections therefor for linearly sliding valves, e.g. spool valves
Abstract
The invention relates to a balance valve for a walking motor and a crawler excavator, aiming at solving the problem that the existing balance valve for the walking motor is inconvenient to disassemble a valve core; the balance valve for the walking motor and the crawler excavator are provided, wherein two ends of a valve core of the balance valve are respectively provided with a one-way valve, a valve core resetting component and a valve core limiting mechanism; the check valve is arranged in an inner cavity hole at the end part of the valve core, the oil inlet end of the check valve is communicated with the front oil duct of the valve through an oil hole on the valve core, the front oil duct of the valve is communicated with a cavity of the valve core at the end part, and the spring cavity is communicated with the rear oil duct of the valve through the oil hole on the valve core; in the invention, when the valve core is disassembled, the valve core can be taken out piece by piece after the plug is disassembled, the valve core assembly with the longest length in the taken-out part can be taken out under the conditions that the bent plate of the crawler beam support of the original walking frame is not modified and the walking motor is not required to be disassembled, so that the cost for replacing and maintaining the valve core of the walking motor balance valve can be reduced, the maintainability of a machine is improved, and the working efficiency is improved.
Description
Technical Field
The invention relates to a balance valve, in particular to a balance valve for a walking motor and a crawler excavator.
Background
The hydraulic system of the hydraulic crawler excavator is formed by connecting and combining a hydraulic pump, a distribution valve, a hydraulic motor, a pilot hydraulic system and hydraulic accessories by pipelines, converts mechanical energy of an engine into hydraulic energy by taking oil as a medium for transmission, and then converts the hydraulic energy into the mechanical energy by a hydraulic execution element to realize various actions of the whole excavator. The walking function is driven by the walking motor, the daily use frequency is high, and the valve core of the walking motor balance valve needs to be cleaned after being disassembled during maintenance.
The walking motor is arranged on the left and right crawler beam brackets of the walking frame. The valve body of the walking motor balance valve and the flange rear flange of the walking motor are of an integral structure, the valve core of the walking motor balance valve is of an integral valve core, and the whole valve core needs to be pulled out together when the valve core is disassembled.
After a walking motor on the whole machine breaks down, when a valve core of the balance valve is replaced or cleaned and maintained, the whole valve core needs to be pulled out together when the valve core is detached due to the fact that the valve core of the walking motor balance valve is an integrated valve core. At present, the space of a bent plate of a track beam support of a walking frame is not enough for disassembling a valve core, a walking motor assembly is required to be disassembled from the whole walking frame, the valve core of a balance valve can be disassembled, the maintenance difficulty and the workload are very large, and the working efficiency is low. If the space for reserving the dismounting valve core is enlarged by the bent plate of the crawler beam support of the walking frame, the manufacturing difficulty of the walking frame is increased due to the need of reserving a larger space, and the overall stability of the walking frame is reduced.
Disclosure of Invention
The invention aims to solve the technical problem that the valve core is inconvenient to disassemble by using a balance valve for the existing walking motor, and provides the balance valve for the walking motor and a crawler excavator, so that a walking motor assembly does not need to be integrally disassembled from a walking frame or a structure of a bent plate of a crawler beam support of the walking frame is not needed to be changed when the valve core is disassembled.
The technical scheme for realizing the purpose of the invention is as follows: the balance valve for the walking motor comprises a valve core assembly, wherein the valve core assembly is positioned in a valve cavity arranged in a flange rear flange of the walking motor, and two ends of the valve cavity are provided with plugs in threaded connection with the flange rear flange; the valve core assembly comprises a valve core, wherein two ends of the valve core are respectively provided with a one-way valve, a valve core resetting assembly and a valve core limiting mechanism for limiting the axial movement stroke of the valve core; the check valve comprises a check valve seat fixed in the inner cavity hole at the end part of the valve core and forming a check valve cavity with the valve core, a check valve core arranged in the check valve cavity and forming a valve opening and closing part with the side wall of the check valve cavity, and a check valve spring arranged in a spring cavity between the check valve seat and the check valve core, wherein the oil inlet end of the check valve is communicated with a corresponding valve front oil duct in the flange rear flange through an oil hole on the valve core, the valve front oil duct is communicated with a cavity at the end part of the valve core, and the spring cavity is communicated with a valve rear oil duct in the flange rear flange through an oil hole on the valve core; the valve core resetting assembly comprises a resetting spring and a spring retainer ring, one end of the resetting spring is connected with the plug, the other end of the resetting spring is in contact connection with one side of the spring retainer ring, the other side of the spring retainer ring is in contact connection with the end part of the valve core, and a limiting step which is used for being in contact with the spring retainer ring and limiting the stroke of the spring retainer ring is arranged on the side wall of the valve cavity; after the valve core moves in a reversing way, the front valve oil duct and the rear valve oil duct which are positioned on the side of the moving direction of the valve core in the flange rear-mounted flange are communicated through a shoulder oil duct on the valve core, and the front valve oil duct and the rear valve oil duct are both cut off when the valve core is positioned at the middle position. In the invention, the check valve is arranged in the valve core, the components at two ends of the valve core component are in contact connection with the valve core, the valve core can be taken out piece by piece after the plug is disassembled when the valve core is disassembled, the valve core with the longest length in the taken-out components is the valve core, the length of the valve core is greatly reduced compared with the length of the whole valve core component in the existing balance valve, the valve core component can be taken out under the condition of not modifying the bent plate of the crawler beam support of the original walking frame and disassembling the walking motor, the cost of replacing and maintaining the valve core of the balance valve of the walking motor can be reduced, the maintainability of a machine is.
In the balance valve for the walking motor, the one-way valve seat is fixedly connected with the valve core through thread matching.
In the balance valve for the walking motor, the one-way valve seat is provided with an axial guide hole, the one-way valve core is provided with a guide rod which axially slides in the guide hole on the one-way valve seat, and the one-way valve spring is sleeved on the guide rod on the one-way valve core. Furthermore, a Y-shaped sealing ring for a shaft is arranged on the wall of the guide hole of the one-way valve seat. The guide hole can stabilize the movement of the one-way valve core.
In the balance valve for the traveling motor, the valve core limiting mechanism is composed of a tubular limiting part which is arranged on the plug and extends towards the direction of the valve core, and the end part of the tubular limiting part is used for being in contact with the spring retainer ring, and a radial oil through hole is arranged on the tubular limiting part. Or the valve core limiting mechanism comprises an ejector rod and an auxiliary spring, one end of the ejector rod is in contact connection with the one-way valve seat or the one-way valve core, the other end of the ejector rod is in contact connection with one end of the auxiliary spring, and the other end of the auxiliary spring is in contact connection with the plug. Or the valve core limiting mechanism comprises an ejector rod, one end of the ejector rod is fixedly connected with the plug, the other end of the ejector rod extends towards the direction of the valve core, and the end part of the ejector rod is used for being in contact connection with the one-way valve seat or the one-way valve core. The ejector rod is composed of a columnar rod portion and an installation plate fixed at the end portion of the rod portion, the rod portion is perpendicular to the installation plate, and the installation plate is pressed and fixed between the return spring and the plug.
The technical scheme for realizing the purpose of the invention is as follows: provided is a crawler excavator, characterized by comprising the aforementioned balance valve for a travel motor.
Compared with the prior art, the one-way valve is arranged in the valve core, the components at two ends of the valve core assembly are in contact connection with the valve core, the valve core can be taken out piece by piece after the plug is disassembled when the valve core is disassembled, the valve core with the longest length in the taken-out components is greatly reduced compared with the length of the whole valve core assembly in the existing balance valve, the valve core assembly can be taken out under the condition that the original walking frame crawler beam support bent plate is not modified and the walking motor is disassembled, the replacement and maintenance cost of the valve core of the walking motor balance valve can be reduced, the maintainability of a machine is improved, and the working efficiency is improved.
Drawings
Fig. 1 is a schematic diagram of a structure of a balance valve for a walking motor according to the present invention.
Fig. 2 is a disassembled schematic view of the balance valve for the walking motor of the present invention.
Fig. 3 is a schematic structural view of a balance valve for a traveling motor according to the present invention, which has a second spool limiting mechanism.
Fig. 4 is a schematic structural view of a balance valve for a traveling motor according to the present invention, which has a third spool limiting mechanism.
Detailed Description
The following description of the embodiments refers to the accompanying drawings.
In the embodiment, a walking motor is installed on a track beam of the crawler excavator, and a balance valve is arranged in a flange rear flange 12 of the walking motor. The balance valve for the walking motor is shown in fig. 1 and fig. 2, and comprises a valve core assembly, wherein the valve core assembly is positioned in a valve cavity arranged in a flange rear flange 12 of the walking motor, namely the flange rear flange 12 is used as a valve body of the balance valve. The flange rear flange 12 is provided with a valve cavity, a left valve front oil duct 13, a right valve front oil duct 15, a left valve rear oil duct 14, and a right valve rear oil duct 16. Two ends of the valve cavity are provided with plugs 7 in threaded connection with the flange postposition flange;
the valve core assembly comprises a valve core 10, and two ends of the valve core 10 are respectively provided with a one-way valve, a valve core resetting assembly and a valve core limiting mechanism for limiting the axial movement stroke of the valve core.
The end part of the valve core 10 is provided with an inner cavity hole, the check valve comprises a check valve seat 3 which is fixed at the end part of the inner cavity hole and forms a check valve cavity with the valve core, a check valve core 1 which is arranged in the check valve cavity and forms a valve opening and closing with the side wall of the check valve cavity, and a check valve spring 2 which is arranged in a spring cavity between the check valve seat 3 and the check valve core 1, the check valve seat 3 and the valve core 10 are fixedly connected through thread matching, and a sealing ring is arranged at the connection part.
An axial guide hole is formed in the one-way valve seat 3, the one-way valve core 1 is provided with a guide rod which axially slides in the guide hole in the one-way valve seat 3, and the one-way valve spring 2 is sleeved on the guide rod on the one-way valve core 1. The wall of the guide hole of the one-way valve seat 3 is provided with a Y-shaped seal ring 8 for the shaft. The guide hole can stabilize the movement of the single-phase valve core.
The valve core resetting component comprises a resetting spring 4 and a spring retainer ring 9, one end of the resetting spring 4 is connected with the plug 7, the other end of the resetting spring is in contact connection with one side of the spring retainer ring 9, the other side of the spring retainer ring 9 is in contact connection with the end part of the valve core 10, and the side wall of the valve cavity is provided with a limiting step which is used for being in contact with the spring retainer ring 9 and limiting the stroke of the spring retainer ring; the maximum working length of the return spring is limited by the matching action of the limiting step and the spring retainer ring, so that the position of the valve core in the middle position is determined.
The valve core limiting mechanism comprises an ejector rod 5 and an auxiliary spring 6, one end of the ejector rod 5 is in contact connection with the one-way valve seat 3, the other end of the ejector rod is in contact connection with one end of the auxiliary spring 6, and the other end of the auxiliary spring 6 is in contact connection with the plug 7. The auxiliary spring 6 keeps the mandril 5 in contact with the end surface of the one-way valve seat 3 all the time.
As shown in fig. 1, the oil inlet end of the check valve on the left side of the valve core assembly is communicated with the corresponding left valve front oil duct 13 in the flange rear flange through the oil hole on the valve core, the left valve front oil duct 13 is communicated with the cavity at the left end of the valve core assembly, and the spring cavity of the check valve on the left side is communicated with the left valve rear oil duct 14 in the flange rear flange through the oil hole on the valve core.
The oil inlet end of the check valve on the right side of the valve core assembly is communicated with a corresponding right valve front oil duct 15 in the flange rear flange through an oil hole on the valve core, the right valve front oil duct 15 is communicated with a cavity at the right end of the valve core assembly, and a spring cavity of the check valve on the right side of the valve core assembly is communicated with a right valve rear oil duct 16 in the flange rear flange through the oil hole on the valve core;
the left valve rear oil duct 14 and the right valve rear oil duct 16 are communicated with a hydraulic motor 17, and the left valve front oil duct 1 and the right valve front oil duct 15 are communicated with two working oil ports arranged on the flange rear flange.
The working principle of the balance valve for the walking motor in the embodiment is as follows: if the working oil port of the left valve front oil duct 13 is fed with oil, a part of hydraulic oil enters the oil inlet end of the left check valve of the valve core assembly through the left valve front oil duct 13 and the oil hole on the valve core, and pushes the single valve core 1 to move leftwards, the valve port of the check valve is opened, the oil enters the spring cavity of the left check valve and enters the left valve rear oil duct 14 through the oil hole on the valve core, and finally enters the hydraulic motor 17 through the left valve rear oil duct 14. Meanwhile, a part of oil of the front oil passage of the left valve enters a cavity at the left end of the valve core assembly, acts on the ejector rod 5, pushes the valve core 10 to move rightwards to compress a return spring at the right end, the ejector rod 5 at the left side of the valve core assembly is always in contact connection with the one-way valve seat under the action of the auxiliary spring 6 and moves rightwards along with the valve core, the ejector rod at the right side of the valve core assembly is also always in contact connection with the one-way valve seat at the right end of the valve core assembly under the action of the auxiliary spring at the right end of the valve core assembly and moves rightwards along with the valve core, finally, the right end of the ejector rod at the right end of the valve core assembly is in contact with a plug at the right end to be limited, the one-way valve at the right end of the valve core assembly is not opened, but the rear oil passage of the right valve and the front oil, thereby realizing the oil circuit conduction of the hydraulic motor driving oil. If no pressure oil is input into the two working oil ports, the valve core is kept at the middle position under the action of the return springs at the two ends, the one-way valves at the two ends of the valve core are not opened at the moment, the left valve front oil duct and the left valve rear oil duct are in a cut-off state, and the right valve front oil duct and the right valve rear oil duct are in a cut-off state.
As shown in fig. 2, in this embodiment, except that the valve core and the check valve are fixedly connected, other components of the valve core assembly are in contact connection, and after the plug is unscrewed, the components can be taken out one by one. The valve core is the longest in length among the taken-out components, the length of the valve core is greatly reduced compared with the length of the whole valve core assembly in the existing balance valve, the valve core assembly can be taken out under the condition that the bent plate of the crawler beam support of the original walking frame is not modified and the walking motor assembly 12 is detached from the whole crawler excavator, the cost for replacing and maintaining the valve core of the walking motor balance valve can be reduced, the maintainability of the machine is improved, and the working efficiency is improved.
In this embodiment, the valve core limiting mechanism is composed of a push rod 5 and an auxiliary spring 4, and other structural manners may be adopted to replace the push rod 5 and the auxiliary spring 4 in specific implementation, for example, a plug is used to limit the valve core. As shown in fig. 3, the plug 7 is screwed to the flange rear flange 12 via a threaded pipe 71 having a cylindrical pipe thread structure, an end portion of the threaded pipe 71 of the plug 7 extends in the direction of the valve element 10, and an end portion thereof is a tubular stopper portion 72 for contacting the spring collar, and the tubular stopper portion 72 constitutes a valve element stopper mechanism for restricting the maximum stroke of the valve element. When the valve core 10 moves leftwards or rightwards, after the valve core moves for a corresponding distance, the spring retainer ring 9 pushed by the valve core contacts with the end part of the tubular limiting part 72 of the plug 7 to realize the movement limiting of the valve core, thereby determining the maximum stroke of the valve core. The threaded pipe 71 or the tubular limiting part 72 is provided with a radial oil through hole, so that when the end of the tubular limiting part 72 is contacted with the spring retainer 9, the inner cavity of the tubular limiting part 72 is still communicated with the radial outside, namely, the end cavity of the valve core is communicated with the front oil passage of the valve.
As shown in fig. 4, the valve core limiting mechanism may further include a push rod 5, where the push rod 5 is composed of a columnar rod portion 51 and a mounting plate 52 located at an end of the rod portion 51 and integrated with the rod portion 51, the rod portion 51 is perpendicular to the mounting plate 52, and the mounting plate 52 is tightly pressed and fixed between the return spring 4 and the plug 7. The ejector rod 5 can also be fixedly connected with the plug through threaded fit or welding or integrally structured with the plug. The other end of the mandril extends towards the direction of the valve core 10, and the end part of the mandril is used for being in contact connection with the one-way valve seat or the one-way valve core, when the valve core moves leftwards or rightwards, the one-way valve core or the one-way valve seat contacts with the end part of the mandril after the valve core moves for a corresponding distance, so that the movement limiting of the valve core.
Claims (9)
1. A balance valve for a walking motor comprises a valve core assembly, wherein the valve core assembly is positioned in a valve cavity arranged in a flange rear flange of the walking motor, and two ends of the valve cavity are provided with plugs in threaded connection with the flange rear flange; the valve core assembly comprises a valve core, wherein two ends of the valve core are respectively provided with a one-way valve, a valve core resetting assembly and a valve core limiting mechanism for limiting the axial movement stroke of the valve core;
the check valve comprises a check valve seat fixed in the inner cavity hole at the end part of the valve core and forming a check valve cavity with the valve core, a check valve core arranged in the check valve cavity and forming a valve opening and closing part with the side wall of the check valve cavity, and a check valve spring arranged in a spring cavity between the check valve seat and the check valve core, wherein the oil inlet end of the check valve is communicated with a corresponding valve front oil duct in the flange rear flange through an oil hole on the valve core, the valve front oil duct is communicated with a cavity at the end part of the valve core, and the spring cavity is communicated with a valve rear oil duct in the flange rear flange through an oil hole on the valve core;
the valve core resetting assembly comprises a resetting spring and a spring retainer ring, one end of the resetting spring is connected with the plug, the other end of the resetting spring is in contact connection with one side of the spring retainer ring, the other side of the spring retainer ring is in contact connection with the end part of the valve core, and a limiting step which is used for being in contact with the spring retainer ring and limiting the stroke of the spring retainer ring is arranged on the side wall of the valve cavity;
after the valve core moves in a reversing way, the front valve oil duct and the rear valve oil duct which are positioned on the side of the moving direction of the valve core in the flange rear-mounted flange are communicated through a shoulder oil duct on the valve core, and the front valve oil duct and the rear valve oil duct are both cut off when the valve core is positioned at the middle position.
2. The balance valve for a walking motor as claimed in claim 1, wherein said single valve seat is fixedly connected to said valve core by screw-fitting.
3. The balance valve for a walking motor as claimed in claim 2, wherein said one-way valve seat is provided with an axial guide hole, said one-way valve core is provided with a guide rod axially sliding in the guide hole of said one-way valve seat, and said one-way valve spring is sleeved on the guide rod of said one-way valve core.
4. The balance valve for a walking motor as claimed in claim 3, wherein a Y-shaped seal ring for shaft is provided on the wall of the guide hole of said one-way valve seat.
5. The balance valve for a traveling motor according to any one of claims 1 to 4, characterized in that the spool stopper mechanism is constituted by a tubular stopper portion provided on the plug, extending in the spool direction, and having an end portion for contacting the spring retainer ring, and the tubular stopper portion is provided with a radial oil passage hole.
6. The balance valve for the walking motor as claimed in any one of claims 1 to 4, wherein the valve core limiting mechanism comprises a push rod and an auxiliary spring, one end of the push rod is in contact connection with the one-way valve seat or the one-way valve core, the other end of the push rod is in contact connection with one end of the auxiliary spring, and the other end of the auxiliary spring is in contact connection with the plug.
7. The balance valve for the walking motor as claimed in any one of claims 1 to 4, wherein the valve core limiting mechanism comprises a push rod, one end of the push rod is fixedly connected with the plug, the other end of the push rod extends towards the direction of the valve core, and the end part of the push rod is used for being in contact connection with the one-way valve seat or the one-way valve core.
8. The balance valve for a walking motor as claimed in claim 7, wherein said rod is composed of a columnar rod portion and a mounting plate fixed to the end of the rod portion, said rod portion is perpendicular to the mounting plate, and said mounting plate is pressed and fixed between said return spring and the plug.
9. A crawler excavator having the traveling motor balancer valve according to any one of claims 1 to 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010454071.4A CN111594504B (en) | 2020-05-26 | 2020-05-26 | Balance valve for traveling motor and crawler excavator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010454071.4A CN111594504B (en) | 2020-05-26 | 2020-05-26 | Balance valve for traveling motor and crawler excavator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111594504A true CN111594504A (en) | 2020-08-28 |
| CN111594504B CN111594504B (en) | 2022-05-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010454071.4A Active CN111594504B (en) | 2020-05-26 | 2020-05-26 | Balance valve for traveling motor and crawler excavator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111594504B (en) |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1422079A (en) * | 1973-08-20 | 1976-01-21 | Rockwell International Corp | Bi-directional pressure balanced valve |
| GB1464782A (en) * | 1973-02-07 | 1977-02-16 | Danfoss As | Fluid-flow valve arrangement |
| CN201010925Y (en) * | 2007-03-22 | 2008-01-23 | 湖南山河智能机械股份有限公司 | Straight walking mechanism of hydraulic excavator |
| CN101135398A (en) * | 2006-08-28 | 2008-03-05 | 贺勍 | Combining method for returning place force of balanced valve overlapped by seal pressure and spring force |
| CN101435446A (en) * | 2007-11-14 | 2009-05-20 | 上海立新液压有限公司 | Balance valve |
| CN101865171A (en) * | 2010-07-02 | 2010-10-20 | 镇江大力液压马达有限责任公司 | Thread cartridge balanced valve |
| CN101949397A (en) * | 2010-10-20 | 2011-01-19 | 竺浩君 | Balanced valve bank of derricking cylinder system |
| CN201739249U (en) * | 2009-12-11 | 2011-02-09 | 上海诺玛液压系统有限公司 | Dual-action balance valve used for mechanical hydraulic system of walking engineering machinery |
| CN102996556A (en) * | 2012-12-04 | 2013-03-27 | 怀特(中国)驱动产品有限公司 | Direct-acting type hydraulic threaded cartridge balanced valve |
-
2020
- 2020-05-26 CN CN202010454071.4A patent/CN111594504B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1464782A (en) * | 1973-02-07 | 1977-02-16 | Danfoss As | Fluid-flow valve arrangement |
| GB1422079A (en) * | 1973-08-20 | 1976-01-21 | Rockwell International Corp | Bi-directional pressure balanced valve |
| CN101135398A (en) * | 2006-08-28 | 2008-03-05 | 贺勍 | Combining method for returning place force of balanced valve overlapped by seal pressure and spring force |
| CN201010925Y (en) * | 2007-03-22 | 2008-01-23 | 湖南山河智能机械股份有限公司 | Straight walking mechanism of hydraulic excavator |
| CN101435446A (en) * | 2007-11-14 | 2009-05-20 | 上海立新液压有限公司 | Balance valve |
| CN201739249U (en) * | 2009-12-11 | 2011-02-09 | 上海诺玛液压系统有限公司 | Dual-action balance valve used for mechanical hydraulic system of walking engineering machinery |
| CN101865171A (en) * | 2010-07-02 | 2010-10-20 | 镇江大力液压马达有限责任公司 | Thread cartridge balanced valve |
| CN101949397A (en) * | 2010-10-20 | 2011-01-19 | 竺浩君 | Balanced valve bank of derricking cylinder system |
| CN102996556A (en) * | 2012-12-04 | 2013-03-27 | 怀特(中国)驱动产品有限公司 | Direct-acting type hydraulic threaded cartridge balanced valve |
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| Publication number | Publication date |
|---|---|
| CN111594504B (en) | 2022-05-17 |
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