CN201368079Y - Lifting and steering hydraulic-pressure pile-up valve convenient for manual control - Google Patents
Lifting and steering hydraulic-pressure pile-up valve convenient for manual control Download PDFInfo
- Publication number
- CN201368079Y CN201368079Y CNU200920115450XU CN200920115450U CN201368079Y CN 201368079 Y CN201368079 Y CN 201368079Y CN U200920115450X U CNU200920115450X U CN U200920115450XU CN 200920115450 U CN200920115450 U CN 200920115450U CN 201368079 Y CN201368079 Y CN 201368079Y
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Abstract
The utility model relates to a lifting and steering hydraulic-pressure pile-up valve convenient for manual control; a steering slide valve, a lifting slide valve, a hydraulic control one-way valve, a high pressure relief valve and a lower pressure relief valve, which are respectively composed of valve core holes and valve core poles, are arranged in a valve body and are communicated with each other by a plurality of process oil pipes in the valve body; the pile-up valve is characterized in that: a pair of coaxial internal and external circle double spring seats are arranged at the section of the valve core pole in a spring mounting cavity of the valve core hole of the steering slide valve, an internal-circle spring and an external-circle spring are arranged on the internal and external circle double spring seat; under a non-working state, the internal-circle spring is positioned in a free-loosening state, and the external-circle spring is positioned in a slight-compressing state so as to generate a certain tensile force which leads the valve core pole of the steering slide valve to be positioned at a neutral position. After the steering slide valve adopts a double spring valve core pole control device, the control handle of the steering slide valve is greatly enhanced, thereby further improving the operating efficiency and safety and reliability of the steering operation of the valve.
Description
Technical field
The utility model belongs to hydraulic transmission control technique field, particularly relates to the set hydrovalve that control mechanical elevating and motion turn to.
Background technique
The machinery such as the combine-harvester that generally have lifting and walking function, its taiwan cut off and landing and complete machine steering control mechanism all are discrete settings, and it is big to take volume, inconvenient operation.The applicant had once designed a kind of " mono-lever control lifting; steering hydraulic integrated valve " (patent announcement CN2622451Y) for this reason, offer 5 spool bore in this valve body, be separately installed with and turn to guiding valve, the lifting guiding valve, the spool of Pilot operated check valve and high low pressure relief valve, offer the technology oil duct that connects each valve pocket in the valve body simultaneously, be furnished with the hydraulic oil import that is connected with oil pump on each end face of valve body, promote the connection mouth that oil cylinder is connected with the mechanical elevating platform, two oil outlets that promote that oil cylinder is connected with running mechanism and a return opening and the connection mouth that is connected with oil sump tank etc.It is integrated into some monomer valve in the valve body, and with a handlebar operation, constitutes organic whole, its compact structure, and volume is little, and installation, maintenance, use are all convenient.But this valve still has deficiency, promptly controlling when turning to the displacement of spool valve core bar, because of feedback force little, operator's feel is poor, be difficult for to control steering angle,, easily take place to control improper and cause zig zag and cause security incident particularly for the operator that lacks experience.
Summary of the invention
The purpose of this utility model is to provide a kind of feel manual lifting strong, easy to use, safe and steering hydraulic integrated valve controlled for the lifting running mechanism.
The technical solution of the utility model is: it has valve body, be provided with in the valve body and comprise the following minute valve of forming by spool bore and valve core rod: turn to guiding valve, the lifting guiding valve, Pilot operated check valve, high-pressure overflow valve and low pressure relief valve, being provided with some technology oil ducts between the valve body valve of interior each minute is connected, offer the filler opening that is connected and is connected with inner lifting guiding valve on the valve body end face with the oil outer pump discharge, the interface that is connected and is connected with the Pilot operated check valve of inside with outside mechanical elevating platform promotion oil cylinder filler opening, with inside turn to guiding valve to be connected and with running mechanism promote the corresponding interface that is connected of filler opening of oil cylinder and the interface that is connected with running mechanism promotion oil cylinder return opening and with above-mentioned each minute valve body oil sump tank interface of being connected of valve towards external fuel tank, it is characterized in that being positioned at the Internal and external cycle dual spring seat that a pair of concentric is installed on the valve core rod bar section of the spring installation cavity that turns to the valve core of the spool valve hole, coil spring and cycle spring in being equipped with on the described Internal and external cycle dual spring seat, under off working state, interior coil spring is in free relaxed state, and cycle spring is in slight its pre-compressed state and produce certain force of strain and make the bottom of a pair of Internal and external cycle dual spring seat be against on the interior edge face of spring installation cavity respectively and on the bottom surface of spring installation cavity collar extension calotte, turn to the valve core rod of guiding valve to be in meta thereby make.
The utility model compact structure, volume is little, speed of response is fast, reliable performance, installation, maintenance is convenient, and oil leakage quantity is few, and stain resistance is strong, particularly in turning to guiding valve, adopted to make behind the dual spring valve core rod control device to turn to the feel of controlling of guiding valve to strengthen greatly, thereby further improved the operating efficiency and the safety reliability of this valve steering manipulation.
Description of drawings
Fig. 1 is the utility model embodiment's a plan view.
Fig. 2 is the utility model embodiment's a plan view.
Fig. 3 is the A-A cross-sectional view of Fig. 1, promptly turns to the spool valve core bar to be in meta status architecture schematic representation.
Fig. 4 is for turning to the protruding one-level stroke state of spool valve core bar structural representation.
Fig. 5 is for turning to the protruding secondary stroke state of spool valve core bar structural representation
Fig. 6 is the B-B cross-sectional view of Fig. 1, i.e. lifting spool valve core bar is in meta status architecture schematic representation.
Fig. 7 is in protruding status architecture schematic representation for lifting spool valve core bar.
Fig. 8 is in inside advanced state structural representation for lifting spool valve core bar.
Fig. 9 is the utility model embodiment's a working principle schematic representation.
Embodiment
Present embodiment is to control the hydraulic integrated valve that the walking of combine harvester cutting table lifting and complete machine turns to.
As accompanying drawing 1,2,5, be provided with in the valve body 1 and comprise the following minute valve of forming by spool bore and valve core rod: turn to guiding valve 2, lifting guiding valve 3, Pilot operated check valve 4, high-pressure overflow valve 5 and low pressure relief valve 6, be provided with some technology oil ducts between the valve body valve of interior each minute and be connected, offer the oil inlet P that is connected and is connected with inner lifting guiding valve 3 on the valve body end face with outside oil pump 52 outlets, the interface A that is connected and is connected with the Pilot operated check valve 4 of inside with the mechanical elevating platform promotion oil cylinder 45 filler opening C of outside, with the turning to guiding valve 2 to be connected and promote the filler opening D of oil cylinder 50 of inside with machine-walking
1, D
2The corresponding interface B that connects
1, B
2And with running mechanism promote interface R that oil cylinder return opening E is connected and with above-mentioned each minute valve body oil sump tank interface T of being connected of valve towards external fuel tank 51.See accompanying drawing 3, offer the spool bore that turns to guiding valve 2, high-pressure overflow valve 5 and low pressure relief valve 6 in valve body 1 first half; Turn to the spool bore of guiding valve 2 to run through the left and right side of valve body 1, it radially offers i, j, k, t, m, n, seven annular groove oil pockets of o and a spring seat installation cavity 14, at spring seat installation cavity 14 oral areas, calotte 10 and seal ring 13 are installed on the valve body end face, be installed on and turn to spool valve core bar 11 in this spool bore, casing coupling 27 before its middle part is provided with, middle casing coupling 26 and back casing coupling 25, all make chamfering w with the valve core rod section ora terminalis that preceding casing coupling 27 front and back are adjacent, be positioned at and on the valve core rod bar section of spring installation cavity 14 Internal and external cycle dual spring seat 7 be installed and be installed on cycle spring 8 and coil spring 9 on the dual spring seat, it stretches out outside the valve body, the valve core rod end that is positioned at calotte is equipped with locating stud 12, and valve core rod 11 the other ends stretch out valve body and are connected with operating handle; The spool that is installed in the high-pressure overflow valve spool bore is made of throttling sheet 15, valve pocket 16, spool 17, spring 18 and calotte 19; The spool that is installed in the low pressure relief valve spool bore is to be made of calotte 20, spring 21, spring seat 22, steel ball 23, valve seat 24; The valve seat orifice of low pressure relief valve 6 is connected with the k annular groove oil pocket that turns to guiding valve 2.See accompanying drawing 6, offer the spool bore of lifting guiding valve 3 and Pilot operated check valve 4 in the Lower Half of valve body 1, and the spool bore of lifting guiding valve 3 runs through the front/rear end of valve body, it radially offers a, b, c, d, e five annular groove oil pocket and spring seat installation cavitys 37 around spool bore, at spring seat installation cavity 37 oral areas, calotte 34 is installed on the valve body end face, be installed on the lifting spool valve core bar 44 in this spool bore, casing coupling 41 before its middle part is provided with, back casing coupling 40, wherein back casing coupling 40 is made tapering transition section 39 with valve core rod section convergence part, rear portion, before casing coupling 41 two ends respectively extend on the valve rod of a casing coupling segment distance and offer radial hole 42 respectively, and be connected with this section valve core rod axial center hole 43, one end of valve core rod 44 is equipped with spring seat 33, spring 38, location piece 35, and at spring seat installation cavity 37 oral areas, calotte 34 and seal ring 36 are installed on the valve body end face, and the valve core rod the other end stretches out valve body and is connected with operating handle; The spool that is installed in the Pilot operated check valve spool bore is made of hydraulic control push rod 28, spring 29, valve rod 30, valve pocket 31 and plug screw 32.On valve body 1, except that the mounting hole of each hydraulic fluid port and each functional element, also have a lot of technology oil ducts.Wherein, oil inlet P pressure hydraulic fluid port by technology oil duct and high-pressure overflow valve 5 when the annular groove oil pocket c with lifting guiding valve 3 communicates communicates; The annular groove oil pocket k that turns to guiding valve 2 communicates by the pressure hydraulic fluid port of technology oil duct and low pressure relief valve 6; Valve body hydraulic fluid port B1 is by the technology oil duct and turn to the annular groove oil pocket j of guiding valve 2 to communicate; Valve body hydraulic fluid port B2 is by the technology oil duct and turn to the annular groove oil pocket t of guiding valve 2 to communicate; Valve body hydraulic fluid port R is by the technology oil duct and turn to the annular groove oil pocket n of guiding valve 2 to communicate, and valve body hydraulic fluid port T is by the technology oil duct and turn to annular groove oil pocket i chamber, m chamber, the o chamber of guiding valve 2 to communicate; Wherein turn to the annular groove oil pocket k of guiding valve 2 and the annular groove oil pocket a of lifting guiding valve 3 to communicate by the technology oil duct; The annular groove oil pocket d chamber of lifting guiding valve 3 and the h chamber of Pilot operated check valve 4 communicate by the technology oil duct, the annular groove oil pocket b chamber of lifting guiding valve 3 and the g chamber of Pilot operated check valve 4 communicate by the technology oil duct, and the lifting guiding valve all has the technology oil duct to link to each other with the valve body oil return inlet T with the spring installation cavity that turns to guiding valve.The oil return circuit of valve body valve of interior each minute connects into " mouth " font, makes the oil return of arbitrary place all can significantly reduce the oil return resistance by two drainback passages to oil return inlet T.
The utility model is installed on the rice wheat combine harvester, during use under normal conditions, the valve core rod 44 of the lifting guiding valve of control taiwan cut off and landing is in meta shown in Figure 6 under the effect of spring 38, the spool valve core bar 11 that turns to that the walking of control reaper turns to is in meta shown in Figure 3 under the effect of spring 8.Hydraulic oil from valve body hydraulic fluid port P to lifting guiding valve 3 annular groove oil pocket c and enter valve core rod axial centre duct 43 by one group of radial hole 42 on the valve core rod 44, from the valve core rod 44 another group radial hole 42 flows to annular groove oil pocket a then, again by the technology oil duct to the annular groove oil pocket k chamber that turns to guiding valve 2, arrive the valve body oil return inlet T by annular groove oil pocket m, i chamber subsequently, at this moment, valve body hydraulic fluid port A realizes pressurize under the effect of one-way valve 4, the ceding of Taiwan is highly constant; Valve body hydraulic fluid port B1 communicates by annular groove oil pocket j, i chamber and the oil circuit that turns to guiding valve 2, valve body hydraulic fluid port B2 communicates by annular groove oil pocket l, m chamber and the oil circuit that turns to guiding valve 2, valve body hydraulic fluid port R communicates through m chamber and oil circuit by the annular groove oil pocket n chamber that turns to guiding valve 2, machine-walking promotes oil cylinder 50 and is failure to actuate, and the combine-harvester direction of travel is constant.
The ceding of Taiwan is risen: as shown in Figure 7, operate lifting spool valve core bar 44 makes it protrude outwardly to two spring seats 33 to reach contact condition, the back casing coupling 40 of valve core rod is between the c of spool bore oil pocket and d oil pocket at this moment, so the hydraulic oil that enters from valve body hydraulic fluid port P through the annular groove oil pocket c chamber of lifting guiding valve 3 to the d chamber, the h chamber that flows to Pilot operated check valve 4 is again backed down Pilot operated check valve 4 and is flow to valve body hydraulic fluid port A, enter the mechanical elevating platform by external oil pipe and promote oil cylinder 45, the ceding of Taiwan is risen.Because of valve body hydraulic fluid port P simultaneously and the high pressure hydraulic fluid port of high-pressure overflow valve 5 communicate, so the oil pressure that the ceding of Taiwan is risen is set up by high-pressure overflow valve, the hydraulic oil that overflows arrives valve body hydraulic fluid port T through oil circuit.At this moment, turn to the spool valve core bar still to be in meta, valve body hydraulic fluid port B1, hydraulic fluid port B2, hydraulic fluid port R still communicate with oil circuit, and the combine-harvester direction of travel is constant.
The ceding of Taiwan descends: as shown in Figure 8, operate lifting spool valve core bar 44 inwardly moves back it, the preceding casing coupling 41 that makes valve core rod is between spool bore b oil pocket and c oil pocket, so enter the hydraulic oil of lifting guiding valve 3 annular groove oil pocket c from valve body hydraulic fluid port P, a part enters valve core rod axial centre duct 43 by one group of radial hole 42 on the valve core rod 44, from the valve core rod 44 another group radial hole 42 flows to annular groove oil pocket b then, simultaneously a part of hydraulic oil from the c chamber directly to the b chamber, the oil in b chamber flows to the g chamber of Pilot operated check valve 4 through the technology oil duct, promote hydraulic control push rod 28 and open one-way valve 4, thereby the mechanical elevating platform promotes oil cylinder 45 interior hydraulic oil enter Pilot operated check valve 4 from valve body hydraulic fluid port A by the connection oil pipe h chamber, flow to the d chamber of lifting guiding valve 3, tapering transition section 39 to annular groove oil pocket e on valve core rod, through the spring seat installation cavity 37 of gap f to spool, again through the technology oil duct to the valve body oil return inlet T, the ceding of Taiwan descends.The position difference of inwardly moving back along with valve core rod 44, the flow area difference that forms between tapering transition section 39 and the annular groove oil pocket e, valve core rod 44 moves back flow area more toward in big more, flow area is big more, the hydraulic oil that the mechanical elevating platform promotes in the oil cylinder 45 is short more through the time that above-mentioned passage flows to the valve body oil return inlet T, the ceding of Taiwan descends fast more, otherwise then slow.Therefore the operator can control the rate of descent of the ceding of Taiwan by the position of control valve core bar 44.The limit position that valve core rod 44 inwardly moves back is that two spring seats 33 are to contact condition.At this moment, turn to the spool valve core bar still to be in meta, valve body hydraulic fluid port B1, hydraulic fluid port B2, hydraulic fluid port R still communicate with oil circuit, and the combine-harvester direction of travel is constant.
Turn to control: when lifting spool valve core bar 44 is in meta shown in Figure 6 under the effect of Returnning spring 38, manipulation turns to spool valve core bar 11, with the valve core rod 11 protruding stroke state of one-level as shown in Figure 4, at this moment, cycle spring 8 is compressed, and interior coil spring 9 is not subjected to further compressive force as yet, hydraulic oil is the annular groove oil pocket c from valve body hydraulic fluid port P to lifting guiding valve 3 earlier, and enter valve core rod axial centre duct 43 by one group of radial hole 42 on the lifting spool valve core bar 44, from the valve core rod 44 another group radial hole 42 flows to annular groove oil pocket a then, again by the technology oil duct to the annular groove oil pocket k chamber that turns to guiding valve 2, and flow to the t chamber, through the technology oil duct to valve body hydraulic fluid port B2, enter the filler opening D2 that machine-walking promotes oil cylinder 50 by external oil pipe, it is protruding to promote machine-walking promotion oil cylinder plunger 48, extend out to oil cylinder filler opening D2 and oil cylinder q chamber communicates, promote the return opening E of oil cylinder 50 to machine-walking by the technology oilhole, get back to valve body hydraulic fluid port R through external oil pipe, again by the technology oil duct to the annular groove oil pocket n chamber that turns to guiding valve 2, through the m chamber to oil circuit.Machine-walking promotes the piston spring 49 of oil cylinder along with stretching out of plunger is compressed, produce one and stop plunger 48 outwardly directed power, the return opening E that promotes oil cylinder 50 because of machine-walking communicates by valve body hydraulic fluid port R and oil circuit, so state that plunger 48 keeps the q chamber to communicate with oil cylinder filler opening D2 under the resistance of piston spring 49, and can not continue toward overhanging, at this moment oil cylinder plunger 48 promotes combine-harvester one side steering arm, the clutch of this side is disconnected, but this moment, valve body hydraulic fluid port B1 communicates by i chamber and the oil circuit that turns to guiding valve 2, oil cylinder plunger 46 and piston spring 47 are failure to actuate, therefore, the clutch of oil cylinder filler opening D1 side still is in jointing state, and the manipulation combine-harvester advances and then turns to oil cylinder filler opening D2 side, and this moment, turning radius was bigger.When continuing the control valve core bar 11 protruding stroke state of secondary as shown in Figure 5, spring 9 also is compressed, thereby forming, spring 9 and spring 8 make a concerted effort to stop valve core rod 11 to be moved further, the operator feels that obviously steering force becomes big, be that prompting operation person's combine-harvester is turning to, simultaneously, because moving of valve core rod 11, turn to the annular groove oil pocket n chamber of guiding valve to lead under the effect of flow area valve core rod section ora terminalis chamfering at casing coupling 27 two ends before valve core rod in m chamber, beginning constantly diminishes, finally close fully, therefore, in the 9 compressed whiles of beginning of spring, the pressure at valve body hydraulic fluid port R place finally arrives the set pressure of low pressure relief valve 6 along with moving constantly of valve core rod increases.Increase along with valve body hydraulic fluid port R place pressure, machine-walking promotes the oil outlet E of oil cylinder 50 and the hydraulic oil of filler opening D2 increases simultaneously, promotion oil cylinder plunger overcomes piston spring power and continues protruding, thereby the steering arm that further promotes this side is braked this side wheel gradually, the suffered braking force of this side wheel is big more, and then combine-harvester opposite side roller steering radius is more little is that combine-harvester walking radius of turn is more little.In like manner, turn to spool valve core bar 11 inwardly to advance if handle, then combine-harvester is done and above-mentioned opposite directional steering.
From the above, the operator turns to the displacement stroke of spool valve core bar 11 by manipulation, promptly controls the size of combine-harvester walking radius of turn.And owing to originally turn to the one-level displacement stroke of spool valve core bar 11 to adopt single spring to match, the secondary displacement stroke adopts dual spring to match, make operator's feel obvious, thereby help the fast skilled in-local of operator and improve the safety reliability of this machine use and the operating efficiency of combine-harvester.
Claims (5)
1. be convenient to manual lifting and steering hydraulic integrated valve for one kind, has valve body (1), be provided with in the valve body (1) and comprise the following minute valve of forming by spool bore and valve core rod: turn to guiding valve (2), lifting guiding valve (3), Pilot operated check valve (4), high-pressure overflow valve (5) and low pressure relief valve (6), being provided with some technology oil ducts between the valve body valve of interior each minute is connected, offer the oil inlet P that is connected and is connected with inner lifting guiding valve (3) on valve body (1) end face with outside oil pump (52) outlet, the interface A that is connected and is connected with the Pilot operated check valve (4) of inside with outside mechanical elevating platform promotion oil cylinder (45) filler opening C, with the turning to guiding valve (2) to be connected and promote the filler opening D1 of oil cylinder (50) of inside with running mechanism, the corresponding interface B1 that connects of D2, B2 and with running mechanism promote interface R that oil cylinder return opening E is connected and with above-mentioned each minute valve body oil sump tank interface T of being connected of valve towards external fuel tank (51), it is characterized in that being positioned on the valve core rod bar section of the spring installation cavity (14) that turns to guiding valve (2) spool bore a pair of concentric dual spring seat (7) is installed, interior coil spring (9) and cycle spring (8) are installed between two dual spring seats (7), under off working state, interior coil spring (9) is in free relaxed state, and cycle spring (8) is in slight its pre-compressed state and produce certain force of strain and make the bottom of a pair of Internal and external cycle dual spring seat (7) be against on the interior edge face of spring installation cavity (14) respectively and on the bottom surface of spring installation cavity collar extension calotte (10), thereby makes the valve core rod (11) that turns to guiding valve be in meta.
2. by described lifting and the steering hydraulic integrated valve of being convenient to manual control of claim 1, it is characterized in that the oil return circuit of valve body valve of interior each minute connects into the square shape loop.
3. by described lifting and the steering hydraulic integrated valve of being convenient to manual control of claim 1, it is characterized in that turning to the spool bore of guiding valve (2) to run through the left and right side of valve body (1), it radially offers i, j, k, t, m, n, seven annular groove oil pockets of o and a spring seat installation cavity (14), at spring seat installation cavity (14) oral area, calotte (10) and sealing gasket (13) are installed on the valve body end face, be installed on and turn to spool valve core bar (11) in this spool bore, its middle part is provided with preceding casing coupling (27), middle casing coupling (26) and back casing coupling (25), be positioned at and on the valve core rod bar section of spring installation cavity (14) Internal and external cycle dual spring seat (7) be installed and be installed on cycle spring (8) and coil spring (9) on the dual spring seat, it stretches out outside the valve body, the valve core rod end that is positioned at calotte is equipped with locating stud (12), and valve core rod (11) the other end stretches out valve body and is connected with operating handle.
4. be convenient to manual lifting and steering hydraulic integrated valve by claim 3 is described, it is characterized in that the adjacent valve core rod section ora terminalis in the preceding casing coupling of valve core rod (11) 27 front and back all makes chamfering w.
5. by described lifting and the steering hydraulic integrated valve of being convenient to manual control of claim 1, it is characterized in that the spool bore of lifting guiding valve (3) runs through the front/rear end of valve body, it radially offers a, b, c, d, e five annular groove oil pocket and springs around spool bore
SeatInstall
The chamber(37), at spring seat installation cavity (37) oral area, calotte (34) is installed on the valve body end face, be installed on the lifting spool valve core bar (44) in this spool bore, its middle part is provided with preceding casing coupling (41), back casing coupling (40), wherein back casing coupling (40) is made tapering transition section (39) with valve core rod section convergence part, rear portion, before casing coupling (41) two ends respectively extend on the valve rod of a casing coupling segment distance and offer radial hole (42) respectively, and be connected with this section valve core rod axial center hole (43), one end of valve core rod (44) is equipped with spring seat (33), spring (38), location piece (35), and at spring seat installation cavity (37) oral area, calotte (34) and sealing gasket (36) are installed on the valve body end face, and the valve core rod the other end stretches out valve body and is connected with operating handle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU200920115450XU CN201368079Y (en) | 2009-03-13 | 2009-03-13 | Lifting and steering hydraulic-pressure pile-up valve convenient for manual control |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU200920115450XU CN201368079Y (en) | 2009-03-13 | 2009-03-13 | Lifting and steering hydraulic-pressure pile-up valve convenient for manual control |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201368079Y true CN201368079Y (en) | 2009-12-23 |
Family
ID=41486972
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU200920115450XU Expired - Lifetime CN201368079Y (en) | 2009-03-13 | 2009-03-13 | Lifting and steering hydraulic-pressure pile-up valve convenient for manual control |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201368079Y (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103016432A (en) * | 2012-12-17 | 2013-04-03 | 三一重工股份有限公司 | Secondary relief valve, hydraulic lowering system for cranes and crane |
| CN101504018B (en) * | 2009-03-13 | 2013-10-02 | 湖州生力液压有限公司 | Lifting and steering hydraulic integrated valve with manual convenience |
| CN104196796A (en) * | 2014-08-19 | 2014-12-10 | 合肥长源液压股份有限公司 | Pile-up valve for energy recovery of excavator and with overload preventing function |
| CN104454738A (en) * | 2014-12-22 | 2015-03-25 | 浙江海宏液压科技股份有限公司 | Agriculture machine control valve |
| CN115042857A (en) * | 2022-07-14 | 2022-09-13 | 芜湖双翼液压件有限公司 | Crawler-type steering hydraulic valve and control system |
-
2009
- 2009-03-13 CN CNU200920115450XU patent/CN201368079Y/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101504018B (en) * | 2009-03-13 | 2013-10-02 | 湖州生力液压有限公司 | Lifting and steering hydraulic integrated valve with manual convenience |
| CN103016432A (en) * | 2012-12-17 | 2013-04-03 | 三一重工股份有限公司 | Secondary relief valve, hydraulic lowering system for cranes and crane |
| CN103016432B (en) * | 2012-12-17 | 2016-02-10 | 三一重工股份有限公司 | Secondary relief, hoist fall width hydraulic system and hoist |
| CN104196796A (en) * | 2014-08-19 | 2014-12-10 | 合肥长源液压股份有限公司 | Pile-up valve for energy recovery of excavator and with overload preventing function |
| CN104454738A (en) * | 2014-12-22 | 2015-03-25 | 浙江海宏液压科技股份有限公司 | Agriculture machine control valve |
| CN115042857A (en) * | 2022-07-14 | 2022-09-13 | 芜湖双翼液压件有限公司 | Crawler-type steering hydraulic valve and control system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20091223 Effective date of abandoning: 20090313 |
|
| RGAV | Abandon patent right to avoid regrant |