CN101235835A - Hydraulic digital controller - Google Patents
Hydraulic digital controller Download PDFInfo
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- CN101235835A CN101235835A CNA200810034085XA CN200810034085A CN101235835A CN 101235835 A CN101235835 A CN 101235835A CN A200810034085X A CNA200810034085X A CN A200810034085XA CN 200810034085 A CN200810034085 A CN 200810034085A CN 101235835 A CN101235835 A CN 101235835A
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Abstract
The invention relates to a hydraulic digital control device, which comprises a controlling mechanism, an oil circuit P, an oil circuit T and an oil circuit A, wherein the controlling mechanism controls a controllable reversing valve, the oil circuit P is communicated with an oil pump, the oil circuit T is communicated with an oil box, the oil circuit A is communicated with load, the controlling mechanism is a rotor which is driven by a motor, the controllable reversing valve is a turning type three-way switch valve which comprises a flow distribution component which is matched with the rotor, the turning type three-way switch valve controls the oil circuit A, the oil circuit P and the oil circuit T to exchange and is communicated with a resonant cavity of an adjustable resonance device. The hydraulic digital control device has simple structure and convenient adjustment, thereby increasing the system efficiency, achieving excellent binding of the digital control and a hydraulic device, proving a transformation device for digital hydraulic pressure in a real sense, and the hydraulic digital control device has a wide application prospect in next generation.
Description
Technical field
The present invention relates to a kind of hydraulic control device, particularly a kind of digital hydraulic conversion equipment can be used for realizing to the output oil liquid pressure, and flow digital control, easy to adjust belongs to digital hydraulics field.
Background technique
Traditional throttling regulator solution hydraulic circuit generally all is the oil hydraulic pump continuous oil supply, controls flow and the pressure of exporting fluid by the throttling action of throttling arrangement, will certainly produce restriction loss, makes system effectiveness descend.Though the research of digital Hydraulic Field has obtained certain progress in recent years, what be to use remains traditional hydraulic element, and restriction loss still exists, and the digital control control electromagnetic valve that only limits to, and therefore is subjected to the restriction of solenoid valve response capability.
Summary of the invention
The objective of the invention is to defective, a kind of digital hydraulic conversion equipment is provided, can be used for realizing that logarithm goes out the digital control of oil liquid pressure, flow at the prior art existence.
For achieving the above object, design of the present invention is:
The digital hydraulic conversion equipment that the present invention proposes, by successively from oil hydraulic pump and fuel tank fuel feeding to load, in conjunction with a kind of resonance device, system is worked under resonance condition, improved system effectiveness widely.And regulate the logical oil time of logical pump oil circuit P and logical fuel tank oil circuit T, regulate the oil circuit inversion frequency, can regulate output oil liquid pressure or flow easily.
On the other hand, this invention is with hydraulic pressure installation and digital control being combined togather.As everyone knows, digital controlly be widely used in the engineering field, yet but seldom be applied in Hydraulic Field, main cause is to lack hydraulic switching valve at a high speed.Digital control, especially conversion and control, the inversion frequency of all having relatively high expectations, yet pass through the switching frequency that the multistage hydraulic amplifying device obtains at present, only there are tens hertz, the frequency of high-speed switch electromagnetic valve is the highest also only to be up to a hundred hertz, and spool inertia and electromagnet response capability have all limited the raising of frequency.The raising of frequency makes hydraulic pressure installation through-current capability carrying load ability and decline in addition.
The present invention adopts porous flow principle, by porous rotor high-speed rotation, realizes the quick switching of oil circuit, can reach higher inversion frequency.The resonance device natural frequency can be regulated, to adapt to the different rotating speeds requirement.The relative position on dial control limit can be regulated oil circuit on time easily, realizes pulse-width regulated.This hydraulic pressure installation adopts axial flow distribution, and simple in structure, easy to adjust, efficient is higher.
This hydraulic pressure conversion equipment can be regulated the pressure and the flow of output fluid easily and accurately according to the design of hydraulic pressure transfer principle, has higher efficient.
The hydraulic pressure transfer principle by a controlled selector valve 1, is switched on or switched off load oil hydraulic cylinder 2 as shown in Figure 1 with oil circuit P and T, oil circuit P connects oil hydraulic pump, and oil circuit T connects fuel tank.When selector valve 1 worked in a position, oil circuit P connected cylinder pressure chamber 4, and fluid overcomes load F motion, and pressure chamber 4 volumes increase; When selector valve was worked to the b position through the c position, oil circuit P disconnected, and oil circuit T connects, because the effect of inertia of fluid and mass block m, the pressure chamber volume continues to increase, and makes the pressure chamber pressure p drop to the fuel tank precompressed, and fluid is inhaled into pressure chamber 4 on a small quantity; When selector valve 1 again through the c position during to a position, because the effect of load F, the hydraulic cylinder piston stop motion, as pressure chamber 4 internal pressure p during greater than oil circuit P oil pressure, fluid is pushed back oil circuit P again, in the fluid reflux course, can or connect other load restoration part energy, thereby improve system effectiveness by the accumulator accumulation of energy.Can control the oil circuit P of selector valve 1 by control gear 3, the T transfer sequence, logical oil time and switching frequency, and then can control and export oil liquid pressure and flow.
Hydraulic pressure transfer principle shown in Figure 1 can be realized by the mode of resonantron, as shown in Figure 2, make resonant cavity 5 connect oil circuit P and T by selector valve 1, in the quick transfer process of oil circuit, produce and the same pressure wave frequently of inversion frequency in pressure chamber 5 ingress 6, by setting the length of resonantron 5, make the pressure wave of ingress and the pressure wave stack of resonant cavity end reflections form standing wave.A certain resonance node place 8 output fluid are to the load oil hydraulic cylinder on resonantron 5.Because resonantron 5 ends 7 are fixed end, standing wave amplitude perseverance everywhere is 0, regulates oil circuit P by control gear 3, just can regulate the delivery pressure of resonantron 5 on time of T.But adopt this device that two shortcomings are arranged, the one, resonantron 5 is the shortest to be half of pressure wave wavelength, be generally several meters, and the inversion frequency of selector valve 1 is low more, the resonantron of requirement is just long more.The 2nd, the system resonance frequency is determined, can't regulate, and the device regulation range is limited.
Realize the shortcoming of hydraulic pressure conversion equipment at resonantron 5, the present invention adopts resonance device 9 to replace resonantron 5, as shown in Figure 3, make resonant cavity 14 connect oil circuit P successively by selector valve 1, oil circuit T and oil circuit A, oil circuit P connects oil hydraulic pump fuel feeding circuit, and oil circuit T connects fuel tank, and oil circuit A is used for driving load.Oil circuit P, the logical oily process of oil circuit T was introduced in transfer principle, and when resonant cavity 14 volumes reached maximum, oil circuit A connected, and fluid output drives load.Resonance device 9 is made up of pressure-sensitive diaphragm 12 sealing adjustable compression air 11, and the mass block 10 that is connected on the pressure-sensitive diaphragm 12 can be regulated compressed air pressure by port one 3, and then can change the natural frequency of resonance device.When the oil circuit inversion frequency was identical with resonance device 9 natural frequencys, system reached resonance, formed standing wave in the pressure chamber 4, when pressure chamber 4 outlets are positioned at the standing wave anti-node location, and pressure wave amplitude maximum, delivery pressure is the highest.Oil circuit P can be regulated by control mechanism 3, the logical oil time of oil circuit T and oil circuit A, the delivery pressure and the flow of pressure chamber 4 can be conveniently regulated.Output oil pressure generally can be regulated in the scope of fuel tank oil pressure and pump oil pressure, and when the logical oil time of regulating oil circuit A was less than the logical oil time sum of oil circuit P and T, output oil pressure can be greater than the pump output oil pressure.Use this device can overcome the structural limitations of using resonantron, regulation range can also change the system resonance frequency and adapt to different inversion frequencies also greater than the regulation range of resonantron conversion equipment, and applicability is stronger.
According to the foregoing invention design, the present invention adopts following technical proposals.
A kind of hydraulic digital controller, comprise controlled switching valve 1 of a control mechanism 3 control and connect the oil circuit P of oil pump, connect the oil circuit T of fuel tank and connect switching between the oil circuit A of load, it is characterized in that described control mechanism be one by motor-driven rotor 20; Described controlled switching valve 1 is rotary type No. three switching valves that constitute with described rotor 20 coupling flow members; Rotary type No. three switching valves are controlled described oil circuit A, and oil circuit P and oil circuit T exchange the resonant cavity 14 of connecting an adjustable resonance device 9.
Above-mentioned rotor 20, rotary type No. three switching valves, oil circuit P, oil circuit T, oil circuit A and resonance device 9 set constitute an integral hydraulic numerical control device.
Above-mentioned integral hydraulic numerical control device comprises a casing 14, its front end connects a blind flange 15, its rear end connects an end cap 19, and inner chamber is settled the kernel 18 that constitutes rotor 20 rotary types No. three switching valves, resonance device 9 and oil circuit P, T, A, the rotating shaft of rotor 20 is stretched out external variable speed machine from blind flange 15, and oil circuit P, T, A pick out from end cap 19 respectively.
The structure of above-mentioned kernel 18 is: the inner of described rotor 20 is cylindrical body, the three oil circuit P that uniform three row's perforation constitute on this cylindrical body, T, the keying activity valve port of A, the rotation inserting is fixing in this cylindrical body goes out oil cavity 22 and control volume 21, oil circuit A is set in going out oil cavity 22, oil circuit P and oil circuit T are set in control volume 21, three oil circuit A, P, the inner port of T is aimed at the row of three on rotor 22 cylindrical bodys perforation respectively, constitute three oil circuit P, T, the fixing interior valve port of A, on an outer sliding sleeve 23 and the retaining ring 24 of joining of rotor 20 cylindrical bodys, the row's perforation on the row of two on the sleeve 23 perforation and the retaining ring 24 and the cylindrical body of rotor 20 three arranged to bore a hole and aimed at and connect the resonance device 9 that is placed in the casing 16 inwall cavitys.
Above-mentioned adjustable resonance device 9 is to be separated into two chambers by a pressure-sensitive diaphragm 12 in the container, one is resonant cavity 14, but another is a pressure regulation air cavity 11, resonant cavity 14 exchanges connects postal route A, oil circuit P and oil circuit T, but pressure regulation air cavity port connects the pressure regulation air, mass block 10 of fixed installation on the pressure-sensitive diaphragm 12.
Above-mentioned control volume 21 rear end outer rims are processed into gear, and with 48 engagements of a small gear, end cap 19 is stretched out in the rotating shaft of small gear 48, thereby constitutes the positioner of control volume 21.
In three row's perforation of above-mentioned rotor 20 cylindrical bodys, every row's the number of holes is 8, and is circumferentially uniform; One row's perforation of described rotor sleeve 23 2 row's perforation and retaining ring 24 all is that 4 perforation of every row are circumferentially uniform; 4 uniform cavitys of described casing 16 inwalls are aimed at the perforation of sleeve 23 and retaining ring 24; A described adjustable resonance device 9 respectively is set in each cavity; Describedly go out oil cavity 22 4 radially oil circuit A outlets are arranged, the oil circuit P of described control volume 21 and oil circuit T respectively have four radially oil circuit outlets.
The present invention has following conspicuous outstanding substantive distinguishing features and remarkable advantage compared with prior art:
Hydraulic digital controller of the present invention adopts the porous rotor of motor driving high speed rotating and rotary type No. three switching valves that the flow member constitutes oil circuit P, oil circuit T and oil circuit A, realized the control of three logical oil times of oil circuit, adopt three oil circuits to switch the resonant cavity of connecting adjustable resonance device, realize pressure chamber pressure maximum wave-amplitude, delivery pressure is the highest; Adopt positioner to regulate the control volume position, thereby regulate logical pump time and logical fuel tank time, promptly regulate pulsewidth, control output oil pressure power and flow.This device can be realized the accurate control to the fluid output parameter, and by setting up resonant frequency, adapts to different rotating speeds.This apparatus structure is simple, and is easy to adjust, improved system effectiveness, makes digital control and hydraulic pressure installation realize good combination, for truly digital hydraulic pressure provides a kind of conversion equipment, has a wide range of applications in hydraulic system of future generation.
Description of drawings
Fig. 1 is hydraulic pressure transfer principle figure
Fig. 2 is that resonantron is realized hydraulic pressure transfer principle figure
Fig. 3 is that resonance device is realized hydraulic pressure transfer principle figure
Fig. 4 is an one embodiment of the invention card outline drawing
Fig. 5 is the exploded view of Fig. 4 example
Fig. 6 is the exploded view of kernel 18 among Fig. 5
Fig. 7 is the sectional view of Fig. 4 example
Fig. 8 is c-c place sectional view among Fig. 7 (when oil circuit P connects)
Fig. 9 is b-b place sectional view among Fig. 7 (when oil circuit T connects)
Figure 10 is a-a place sectional view among Fig. 7 (when oil circuit A connects)
Embodiment
A preferred embodiment of the present invention accompanying drawings is as follows:
Referring to Fig. 3, Fig. 4, Fig. 5, Fig. 6 and Fig. 7, this hydraulic digital controller comprises that controlled selector valve 1 of a control mechanism 3 control connects the oil circuit P of oil pump, connects the oil circuit T of fuel tank and connect switching between the oil circuit A of load, described control mechanism be one by motor-driven rotor 20, described controlled selector valve 1 is rotary type three way reversing valves that constitute with described rotor 20 coupling flow members; Rotary type three way reversing valve control oil channel A, oil circuit P and oil circuit T exchange the resonant cavity 14 of connecting an adjustable resonance device 9.Rotor 20, rotary type three way reversing valves, oil circuit P, oil circuit T, oil circuit A and resonance device 9 set constitute an integral hydraulic numerical control device.This integral hydraulic numerical control device comprises a casing 16, its front end connects a blind flange 15, its rear end connects an end cap 19, and inner chamber is settled the kernel 18 that constitutes rotor 20, rotary type three way reversing valves, resonance device 9 and oil circuit P, T, A, the rotating shaft of rotor 20 is stretched out external variable speed machine from blind flange 15, and oil circuit P, T, A pick out from end cap 19 respectively.The structure of kernel 18 is: described rotor 20 inner cylindrical, the three oil circuit P that uniform three row's perforation constitute on this cylinder, T, the keying activity valve port of A, the rotation inserting is fixing in this cylindrical body goes out oil cavity 22 and control volume 21, oil circuit A is set in going out oil cavity 22, oil circuit P and oil circuit T are set in control volume 21, three oil circuit A, P, the inner port of T is aimed at the row of three on rotor 22 cylindrical bodys perforation respectively, constitute three oil circuit P, T, the fixing interior valve port of A, on an outer sliding sleeve 23 and the retaining ring 24 of joining of rotor 20 cylindrical bodys, row's perforation of the row of two on the sleeve 23 perforation and retaining ring 24 and the cylindrical body of rotor 20 three arranged to bore a hole and aimed at and connect the resonance device 9 that is placed in the casing 16 inwall cavitys.Resonance device 9 is to be separated into two chambers by a pressure-sensitive diaphragm 12 in the container, one is resonant cavity 14, but another is a pressure regulation air cavity 11, resonant cavity 14 exchanges connects postal route A, oil circuit P and oil circuit T, but pressure regulation air cavity port connects the pressure regulation air, mass block 10 of fixed installation on the pressure-sensitive diaphragm 12.Control volume 21 rear end outer rims are processed into gear, and with 48 engagements of a small gear, end cap 19 is stretched out in the rotating shaft of small gear 48, thereby constitutes the positioner of control volume 21.In three row's perforation of rotor 20 cylindrical bodys, every row's the number of holes is 8, and is circumferentially uniform; One row's perforation of described sleeve 23 2 row's perforation and retaining ring 24 all is that 4 perforation of every row are circumferentially uniform; 4 uniform cavitys of described casing 16 inwalls are aimed at the perforation of sleeve 23 and retaining ring 24; A described adjustable resonance device 9 respectively is set in each cavity; Describedly go out oil cavity 22 4 radially oil circuit A outlets are arranged, the oil circuit P of described control volume 21 and oil circuit T respectively have four radially oil circuit outlets.
Referring to Fig. 8, Fig. 9 and Figure 10, the detailed structure and the working principle of this hydraulic digital controller are as follows:
According to hydraulic pressure transfer principle and embodiment shown in Figure 3, the present invention proposes a kind of digital hydraulic conversion equipment, concrete structure as shown in Figure 4, this installs by flange plate 15, casing 16 (containing resonance device 9), pinion stand 17, kernel 18, end cap 19 compositions such as grade, kernel 18 is by rotor 20 and four flow members---control volume 21, go out oil pocket 22, sleeve 23 and retaining ring 24 are formed.
Article three, the flow section of runner such as Fig. 8, Fig. 9 and shown in Figure 10, when rotor hole 25 goes to retaining ring 24 oil throughs 29 control limits 35, oil circuit P begins to connect, fluid from oil hydraulic pump through control body cavity 30, rotor hole 25, retaining ring oil through 29 flow to resonant cavity 14, pressure-sensitive diaphragm 12 compressive deformations, sealing air compression; When rotor hole 25 turned over the control limit 36 in chamber 30, oil circuit P disconnected, and simultaneously, rotor hole 26 goes to control body cavity 31 control limits 37, and oil circuit T connects, fluid from resonant cavity 14 through control body cavity 31, rotor hole 26, sleeve 23 hydraulic fluid ports 32 a small amount of resonant cavities 14 that suck; When rotor hole 26 turned over the control limit 38 of sleeve 23 hydraulic fluid ports 32, oil circuit T disconnected, and rotor hole 27 goes to the control limit 39 of sleeve 23 hydraulic fluid ports 33 simultaneously, and oil circuit A connects, and fluid is from resonant cavity 14, through sleeve hydraulic fluid port 33, and rotor hole 27, flow out in the chamber 34 that goes out oil pocket 22; When rotor hole 27 turned over the control limit 40 in chamber 34, oil circuit A disconnected, and this moment, rotor hole 28 reclosed oil circuit P, and new circulation begins.
As mentioned above, the logical oil time of oil circuit P is by the angle α ' of two control limits 35,36 formations
PDecision, the angle α ' that the logical oil time of oil circuit T is made up of control limit 37,38
TDecision, the fuel-displaced time of oil circuit A is by the angle α ' on control limit 39,40
ADecision.Because rotor hole has certain thickness, therefore, oil circuit P, the logical oil time of oil circuit T and oil circuit A is respectively controlled angle α '
P, α '
T, α '
AWith rotor angle of spot hole θ sum.
Realize this digital hydraulic device is exported the digital control of fluid, just require the control angle is regulated, make the logical oil time of oil circuit P and oil circuit T approximate the fuel-displaced time of oil circuit A greatly, promptly make control limit 39 divide the central angle between control limit 35 and the limit 41 equally.And regulate the position of control limit 36 and 37, promptly the position of control volume can be regulated the relative of oil circuit P and oil circuit T and lead to the oil time, promptly realizes pulse-width regulated.
Structural realization has projection 42 as shown in Figure 7 on the axle sleeve 23, can embed to be used for the location in the groove of retaining ring 24, and control position, limit is drilled with cone shape hole 43 on the retaining ring 24, and 16 of available taper pin 44 and casings position.Go out the groove 45 that oil pocket 22 oil outlet places are processed with certain-length, end cap 19 boss cylndrical surface are processed with through hole 46, use pin with hole 47 circumferentially to locate going out 19 of oil pocket 22 and end caps.And go out the oil pocket outlet port and also process screw thread 48, available bolton is used for axial restraint and goes out oil pocket on the end cap boss, but also can adjust the axial clearance between oil pocket and the control volume, reduces the surface friction drag when regulating control volume.Between end cap 19 and the casing 16 by screw (Fig. 7 does not draw), therefore going out oil pocket 22 control limits 40 just can determine with the relative position on retaining ring control limit 35, make that rotor hole 28 went to the control limit of retaining ring 24 when rotor hole 27 turned over out oil pocket control limit 40, oil circuit P connects.
Gear is processed in control volume 21 ends, regulates its position by meshing with small gear 48, and then regulates the logical oil time of oil circuit P and oil circuit T, realizes pulse-width regulated.Control volume 21 control limit place's processing porose 49, by pin 50 it is limited in the groove 51 on the end cap 19, make its regulation range between retaining ring 24 control limits 35 and axle sleeve 23 control limits 38, and can see oil circuit P intuitively, the relativeness of logical oil time of T.
The resonant frequency of resonance device 9 and oil circuit P, T, the switching frequency unanimity of A is worked system under resonance condition.It is relevant that the system resonance frequency is arranged number by the circumferential branch of rotor speed and rotor hole, and the size of angle promptly depends on the quantity in uniform hole by angle decision between rotor hole between the flow member control limit.Because the control limit does not have axial symmetry, so this hydraulic digital controller turns to relevant with rotor.The natural frequency that changes resonance device can adapt to different rotating speed requirements, so this device also can regulate output by changing frequency, and regulation range is wider.
Claims (7)
1. hydraulic digital controller, comprise a controlled switching valve of a control mechanism (3) control (1) and connect the oil circuit P of oil pump, connect the oil circuit T of fuel tank and connect switching between the oil circuit A of load, it is characterized in that described control mechanism be one by motor-driven rotor (20); Described controlled switching valve (1) is rotary type No. three switching valves that constitute with described rotor (20) coupling flow member; Rotary type No. three switching valves are controlled described oil circuit A, and oil circuit P and oil circuit T exchange the resonant cavity (14) of connecting an adjustable resonance device (9).
2. according to the hydraulic digital controller shown in the claim 1, it is characterized in that described rotor (20), rotary type No. three switching valves, oil circuit P, oil circuit T, oil circuit A and resonance device (9) set constitute an integral hydraulic numerical control device.
3. hydraulic digital controller according to claim 2, it is characterized in that described integral hydraulic numerical control device comprises a casing (14), its front end connects a blind flange (15), its rear end connects an end cap (19), and inner chamber is settled the kernel (18) that constitutes rotor (20), rotary type No. three switching valves, resonance device (9) and oil circuit P, T, A, the rotating shaft of rotor (20) is stretched out external variable speed machine from blind flange (15), and oil circuit P, T, A pick out from end cap (19) respectively.
4. according to the hydraulic digital controller shown in the claim 3, the structure that it is characterized in that described kernel (18) is: the inner of described rotor (20) is cylindrical body, the three oil circuit P that uniform three row's perforation constitute on this cylindrical body, T, the keying activity valve port of A, the rotation inserting is fixing in this cylindrical body goes out oil cavity (22) and control volume (21), in going out oil cavity (22), oil circuit A is set, oil circuit P and oil circuit T are set in control volume (21), three oil circuit A, P, the inner port of T is aimed at the row of three on rotor (22) cylindrical body perforation respectively, constitute three oil circuit P, T, the fixing interior valve port of A, on an outer sliding sleeve (23) and the retaining ring (24) of joining of rotor (20) cylindrical body, the row's perforation on the row of two on the sleeve (23) perforation and the retaining ring (24) and the cylindrical body of rotor (20) three arranged to bore a hole and aimed at and connect the resonance device (9) that is placed in casing (16) the inwall cavity.
5. according to the hydraulic digital controller shown in the claim 4, it is characterized in that described adjustable resonance device (9) is to be separated into two chambers by a pressure-sensitive diaphragm (12) in the container, one is resonant cavity (14), but another is pressure regulation air cavity (11), resonant cavity (14) exchanges connects postal route A, oil circuit P and oil circuit T, but pressure regulation air cavity port connects the pressure regulation air, and pressure-sensitive diaphragm (12) is gone up a fixed installation mass block (10).
6. according to the hydraulic digital controller shown in the claim 4, it is characterized in that described control volume (21) rear end outer rim is processed into gear, with a small gear (48) engagement, end cap (19) is stretched out in the rotating shaft of small gear (48), thereby constitutes the positioner of control volume (21).
7. according to the hydraulic digital controller shown in the claim 4, it is characterized in that every row's the number of holes is 8, and is circumferentially uniform in three row's perforation of described rotor (20) cylindrical body; One row's perforation of described rotor sleeve (23) two row's perforation and retaining ring (24) all is that 4 perforation of every row are circumferentially uniform; 4 uniform cavitys of described casing (16) inwall are aimed at the perforation of rotor sleeve (23) and retaining ring (24); A described adjustable resonance device (9) respectively is set in each cavity; Describedly go out oil cavity (22) 4 radially oil circuit A outlets are arranged, the oil circuit P of described control volume (21) and oil circuit T respectively have four radially oil circuit outlets.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA200810034085XA CN101235835A (en) | 2008-02-29 | 2008-02-29 | Hydraulic digital controller |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA200810034085XA CN101235835A (en) | 2008-02-29 | 2008-02-29 | Hydraulic digital controller |
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| Publication Number | Publication Date |
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| CN101235835A true CN101235835A (en) | 2008-08-06 |
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ID=39919674
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA200810034085XA Pending CN101235835A (en) | 2008-02-29 | 2008-02-29 | Hydraulic digital controller |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102748337A (en) * | 2012-07-19 | 2012-10-24 | 意宁液压股份有限公司 | Digital-control cartridge valve type distributor |
-
2008
- 2008-02-29 CN CNA200810034085XA patent/CN101235835A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102748337A (en) * | 2012-07-19 | 2012-10-24 | 意宁液压股份有限公司 | Digital-control cartridge valve type distributor |
| CN102748337B (en) * | 2012-07-19 | 2015-10-28 | 意宁液压股份有限公司 | Digital-control cartridge valve type distributor |
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Open date: 20080806 |