CN102080679A - Novel high-frequency electro-hydraulic flutter generator - Google Patents
Novel high-frequency electro-hydraulic flutter generator Download PDFInfo
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- CN102080679A CN102080679A CN2011100251909A CN201110025190A CN102080679A CN 102080679 A CN102080679 A CN 102080679A CN 2011100251909 A CN2011100251909 A CN 2011100251909A CN 201110025190 A CN201110025190 A CN 201110025190A CN 102080679 A CN102080679 A CN 102080679A
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- 230000007246 mechanism Effects 0.000 claims abstract description 15
- 239000012530 fluid Substances 0.000 claims abstract description 13
- 239000003921 oil Substances 0.000 claims description 38
- 239000000945 filler Substances 0.000 claims description 10
- 230000007306 turnover Effects 0.000 claims description 7
- 239000010720 hydraulic oil Substances 0.000 claims description 6
- 230000005284 excitation Effects 0.000 description 5
- 239000007788 liquid Substances 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 230000010355 oscillation Effects 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- 238000013016 damping Methods 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 229910000897 Babbitt (metal) Inorganic materials 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000003534 oscillatory effect Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
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Abstract
The invention provides a novel high-frequency electro-hydraulic flutter generator, comprising an alternating current (AC) valve and a flutter cylinder, wherein the flutter cylinder comprises a cylinder body; the side wall of the cylinder body is provided with an oil inlet/outlet hole; the inside of the cylinder body is a ring-like chamber; an oil inlet opening is communicated with an oil hole in the center of a cylinder body intermediate column by an oil hole at the bottom of the cylinder body; one end of the cylinder body is provided with an elastic end cap connected with a load; the oil hole in the center of the cylinder body intermediate column is dead against the elastic end cap; the other end of the cylinder body is provided with a fixed end cap; the cylinder body is internally provided with a piston; the piston is tightly connected with the side wall of the cylinder body and the intermediate column wall; the piston is connected with a piston driving mechanism which is used for driving the piston to move up and down; the piston is used for dividing the ring-like chamber into an upper chamber and a lower chamber; the cylinder body inner walls of the upper chamber and the lower chamber are respectively provided with a balance hydraulic fluid port; the two balance hydraulic fluid ports are communicated by a balance oil duct; and the balance oil duct is provided with a high-pressure ball valve. The novel high-frequency electro-hydraulic flutter generator is applied to occasions with large exciting force, high frequency and micro fluctuation, and is small in volume.
Description
Technical field
The present invention relates to a kind of high-frequency electrohydraulic fluttering generator.
Background technique
Mainly contain three types vibration equipment at present, performance characteristics is as follows: 1. mechanical type mainly is divided into centrifugal and direct acting type two classes.The frequency range of centrifugal mechanical shake unit is generally 5～100Hz, and load is 50～10000N; The frequency range of direct acting type mechanical vibrator is 1～200Hz, can obtain very big thrust and bigger amplitude.This class shake unit is simple in structure, cost is low, but upper limiting frequency is lower, is widely used in various low-frequency vibration occasions.2. electromagnetic type, can produce complicated vibrational waveform, have advantages such as waveform distortion is less, operating frequency range is big, owing to be subjected to intrinsic magnetically saturated restriction, be difficult for to obtain big excitation force, in addition, the device structure complexity, vibration displacement is limited and need radiator cooler, therefore, be mainly used in vibration mechine.The frequency range of small-sized electromagnetic type vibrating table is 0～10kHz, and large-scale electromagnetic type vibrating table frequency range is 0～2kHz, is mainly used in fields such as Aeronautics and Astronautics and national defence.3. hydraulic type is widely used in pile driving by vibration, vibration forging, vibration molding, oscillatory shear, vibrating compaction, vibrating transportation, vibrating sieve, farm machinery and vibration mechine etc.In the above-mentioned 3 class vibration equipment, hydraulic type thrust maximum.
In the engineering for big excitation force, high frequency a little (amplitude from 2 μ m to 100 μ m, frequency from the number Hz to the number kHz) and the demand of small volume vibrator more and more urgent; But the excitation force that existing electric and magnetic oscillation equipment is exported when dither is little can not to satisfy requirements at the higher level in the engineering.The hydraulic cylinder structure that common electric liquid vibrating table is adopted is a conventionally form, the asymmetric servo cylinder of promptly two rod oil hydraulic cylinders or differential connection, control unit adopts electrohydraulic control or novel exciting valve, because the quality of hydraulic cylinder piston is bigger, the work cavity volume volume of oil hydraulic cylinder is also relatively large, and the natural frequency of power system is difficult to improve.
Summary of the invention
In order to overcome the deficiency that existing vibration equipment can not be applicable to needs big excitation force, high frequency occasion a little simultaneously, the invention provides and a kind ofly can be applicable to the little novel high-frequency electrohydraulic fluttering generator of big excitation force, high frequency occasion, volume a little.
The technical solution adopted for the present invention to solve the technical problems is:
A kind of novel high-frequency electrohydraulic fluttering generator, comprise and exchange valve and flutter cylinder, described flutter cylinder comprises cylinder body, described cylinder side wall has a turnover oilhole, and described interchange valve comprises valve body, valve pocket, spool and drives the rotational power mechanism of valve core rotation and drive the sliding power mechanism that spool slides; Described valve body is provided with a filler opening, an oil outlet and a return opening, and described oil outlet is communicated with described turnover oilhole, and described filler opening and return opening are communicated with hydraulic oil source; Have the valve pocket that inserts for spool in the described valve body, the outer suit valve pocket of described spool, described cylinder interior is the ring-type cavity volume, described filler opening is connected with the oilhole at cylinder body intermediolateral column center by the oilhole of cylinder base, one end of described cylinder body is installed the elasticity end cap that is connected with load, the described cylinder body the other end installs and fixes end cap, piston is installed in the described cylinder body, the sidewall of described piston and described cylinder body and middle post jamb are tightly connected, described piston is connected with the piston drive mechanism that moves up and down in order to the drive piston, described piston is divided into epicoele and cavity of resorption with the ring-type cavity volume, the inboard wall of cylinder block of described epicoele and cavity of resorption all has the balance hydraulic fluid port, two balance hydraulic fluid ports are communicated with by the balance oil duct, on the described balance oil duct high-pressure ball valve are installed.
Further, described piston drive mechanism comprises piston rod, connecting plate and screw mandrel, described piston is fixedlyed connected with an end of described piston rod, the other end of described piston rod is fixedlyed connected with connecting plate, and described connecting plate is connected by snap ring with an end of screw mandrel, and described screw mandrel is provided with external thread section, described external thread section is installed in the tapped hole of leading screw bearing, tightening nut is installed on the described external thread section, and described leading screw bearing is fixedlyed connected with described cylinder body, and described cylinder body is installed on the fixed support.
Further again, the other end of described big piston is installed adjustable lever.
In the described interchange valve, 4 shoulders are arranged on the spool, wherein two shoulders in the outside are for supporting shoulder, and inboard two shoulders are circumferentially evenly being processed Z respectively
1Individual notch, Z
1Be even number, and the notch mutual dislocation on the shoulder of n 〉=4, two; Valve pocket is opened 4 group windows vertically, and the spacing between two shoulders of spacing between the adjacent window apertures and inboard equates that middle 1 group window is along circumferentially evenly offering Z
2Individual T type window, Z
2Be even number, Z
2=Z
1+ 2, Z is circumferentially evenly offered on 3 groups of edges, the outside
2Individual rectangular window, from the radial cross section direction, the position consistency of each group window.
The oilhole at described cylinder body intermediolateral column center and described elasticity end cap over against
Technical conceive of the present invention is: be made up of hydraulic oil source, interchange valve and flutter cylinder.The flutter cylinder is that single-acting does not have piston hydraulic cylinder, and structural feature is: the left side movable end can change the swept volume of oil hydraulic cylinder, thereby regulates frequency of the natural hydraulic mode; Right side elastic tip output vibration.Exchanging valve is that threeway profile shaft flow rotates selector valve, structural feature is: during valve core rotation, the valve port that two shoulders and valve pocket form in relevant position radially alternately opens and closes, control fluid output AC liquid stream, the innovative design of structural many places makes that to exchange valve working stability and noise when high frequency commutates little, has satisfied the requirement of flutter device dither.
During work, when valve core rotation during to position shown in Figure 3, pressure oil enters from the P mouth, the valve port that this moment, a pair of valve pocket window and spool notch formed is opened, and fluid enters valve inside and flows out from the A mouth through the valve pocket window, and promptly P-A is logical, pressure oil enters the flutter cylinder, and the distortion of oil hydraulic cylinder elastic tip is outstanding; When valve core rotation when the position shown in Figure 4, the valve port that P mouth place valve pocket window and spool notch form is closed, the valve port that A mouth place valve pocket window and spool notch form is opened, T-A is logical, the flutter cylinder takes back oil circuit, the oil hydraulic cylinder elastic tip is replied; Along with the continuous rotation of spool, valve port A and valve port P and T alternate conduction, the spool revolution can make and exchange valve commutation 12 times, and the oil hydraulic cylinder elastic tip produces flutter.
Beneficial effect of the present invention mainly shows: (1) compact structure.To exchange valve and high-pressure ball valve and all be installed on the flutter cylinder, make its compact structure, be convenient to practical application; (2) can improve natural frequency.Owing to saved connecting pipeline, and cavity volume is ring-shaped chamber, reduced the volume of fluid in the pipeline, can improve natural frequency; (3) can improve amplitude greatly.Make the flutter cylinder in resonance point work by regulating cavity volume, thereby can make amplitude maximum and energy consumption very little; (4) be convenient to volume adjusted.By the control of high-pressure ball valve to last lower oil cavitie break-make, when promptly needing volume adjusted, will go up lower oil cavitie and be communicated with, make that going up lower oil cavitie pressure equates, during adjusting, very laborsaving.
Owing to adopted the interchange valve arrangement, the present invention also has following technique effect:
1. vibration frequency height.Conventional hydraulic vibration is to produce vibration by the hydraulic cylinder piston to-and-fro motion, because piston has certain quality and adds load, the high brief acceleration of frequency is big, inertial force and damping force are all very big, needing great restoring force to overcome inertial force vibrates, therefore, realize that the dither difficulty is very big.And being high-frequency ac liquid stream, this electrohydraulic fluttering device acts directly on the bigger hydraulic cylinder of elastic stiffness, make the elasticity end cap produce vibration, only need partly overcome the inertial force (load is vertically installed) of load and not have damping force, relend the elastic-restoring force that helps elastic element very big, can realize very high vibration frequency, vibration frequency depends primarily on the ripple frequency of alternating flow hydraulic stream.Innovative design at the part-structure that exchanges valve can make spool have very high running accuracy under high rotating speed, has guaranteed that the interchange valve exports high-frequency ac liquid stream reposefully.
2. specific power is big.This is the outstanding advantage of hydraulics, except that in oil sources, this electrohydraulic fluttering device by the flutter cylinder with exchange valve and form, volume is very little, but can export bigger power, and is high more a lot of than the power with the magnetic vibrator of volume.
3. micro breadth oscillation.The emergent property of elastic element has determined this electrohydraulic fluttering utensil that the characteristics of micro breadth oscillation are arranged.
4. energy-conservation.The flutter cylinder is designed to the volume adjustable structure, can change frequency of the natural hydraulic mode, when flutter cylinder generation resonance, only needs less power just can realize bigger amplitude.
5. price is low.The performance requirement of other element is not high except that exchanging valve, and therefore, electrohydraulic fluttering device system has compared price advantage with other vibration equipment.
Description of drawings
Fig. 1 is the overall appearance figure of novel high-frequency electrohydraulic fluttering device.
Fig. 2 is the rear view of Fig. 1.
Fig. 3 is the schematic representation of the oil-feed state of novel high-frequency electrohydraulic fluttering generator.
Fig. 4 is the schematic representation of the oil return state of novel high-frequency electrohydraulic fluttering generator.
Wherein, 1-fixed support, 2-flutter cylinder, 3-elasticity end cap, 4-valve base plate, 5-actuating motor, 6-exchanges valve, 7-stepper motor, 8-screw mandrel bearing, 9-connecting plate, 10-adjustable lever, 11-screw mandrel, the 12-high-pressure ball valve, 13-piston rod, 14-tightening nut, 15-snap ring, 16-piston.
Embodiment
Below in conjunction with accompanying drawing the present invention is further described.
With reference to Fig. 1～Fig. 4, a kind of novel high-frequency electrohydraulic fluttering generator, comprise and exchange valve 6 and flutter cylinder 2, described flutter cylinder 2 comprises cylinder body, described cylinder side wall has a turnover oilhole, and described interchange valve comprises valve body, valve pocket, spool and drives the rotational power mechanism of valve core rotation and drive the sliding power mechanism that spool slides; Described valve body is provided with a filler opening, an oil outlet and a return opening, and described oil outlet is communicated with described turnover oilhole, and described filler opening and return opening are communicated with hydraulic oil source; Have the valve pocket that inserts for spool in the described valve body, the outer suit valve pocket of described spool, described cylinder interior is the ring-type cavity volume, described filler opening is connected with the oilhole at cylinder body intermediolateral column center by the oilhole of cylinder base, one end of described cylinder body is installed the elasticity end cap 3 that is connected with load, the described cylinder body the other end installs and fixes end cap, piston 16 is installed in the described cylinder body, described piston 16 is tightly connected with the sidewall and the middle post jamb of described cylinder body, described piston is connected with the piston drive mechanism that moves up and down in order to the drive piston, described piston 16 is divided into epicoele and cavity of resorption with the ring-type cavity volume, the inboard wall of cylinder block of described epicoele and cavity of resorption all has the balance hydraulic fluid port, two balance hydraulic fluid ports are communicated with by the balance oil duct, and high-pressure ball valve 12 is installed on the described balance oil duct.
Described piston drive mechanism comprises piston rod 13, connecting plate 9 and screw mandrel 11, described piston 16 is fixedlyed connected with an end of described piston rod 13, the other end of described piston rod 13 is fixedlyed connected with connecting plate 9, described connecting plate 9 is connected by snap ring 15 with an end of screw mandrel 11, described screw mandrel 11 is provided with external thread section, described external thread section is installed in the tapped hole of leading screw bearing 8, tightening nut 14 is installed on the described external thread section, described leading screw bearing 8 is fixedlyed connected with described cylinder body, and described cylinder body is installed on the fixed support 1.The oilhole at described cylinder body intermediolateral column center and described elasticity end cap 3 over against.
The other end of described big piston 11 is installed adjustable lever 10.Described actuating motor 5 is used to drive valve core rotation, produces the flow of pressurized of alternation, and can come regulating frequency by changing rotating speed, and described stepper motor 7 is used to drive spool and slides, and realizes the control to the valve openings of sizes, and then realizes the control to amplitude.
The interchange valve 6 of present embodiment comprises valve body, valve pocket, spool and drives the rotational power mechanism of valve core rotation and drive the sliding power mechanism that spool slides; Described valve body is provided with an oil inlet P, an oil outlet A and an oil return inlet T, and described oil outlet A is communicated with described turnover oilhole, and described filler opening A and oil return inlet T are communicated with hydraulic oil source; Have the valve pocket that inserts for spool in the described valve body, suit valve pocket outside the described spool has 4 shoulders on the spool, and wherein two shoulders in the outside are the supporting shoulder, and inboard two shoulders are at circumferential even respectively processing Z
1Individual notch, Z
1Be even number, and Z
1Notch mutual dislocation on 〉=4, two shoulders; Valve pocket is opened 4 group windows vertically, and the spacing between two shoulders of spacing between the adjacent window apertures and inboard equates that middle 1 group window is along circumferentially evenly offering Z
2Individual T type window, Z
2Be even number, Z
2=Z
1+ 2, Z is circumferentially evenly offered on 3 groups of edges, the outside
2Individual rectangular window, from the radial cross section direction, the position consistency of each group window.
Described valve pocket material selection copper base bearing metal, valve pocket is opened 4 notches vertically, arc transition between the adjacent in twos notch, it is lubricated to form the dynamic pressure slip at spool supporting shoulder place, on the valve port shoulder of spool balancing slit is arranged.
Spool and valve pocket notch be 165 °＜θ of angle＜180 ° radially.On the closed sides of full spool notch, open triangular groove.
The frequency of okperation f of electrohydraulic fluttering device equals to exchange the product of the spool rotation speed n of valve and the revolution break-make number of times m between spool notch and the valve pocket window, m=Z
1Z
2/ (Z
2-Z
1).
Be electrohydraulic fluttering device schematic diagram as shown in Figure 3, Figure 4, system is made up of hydraulic oil source, interchange valve 6 and flutter cylinder 2.Flutter cylinder 2 does not have piston hydraulic cylinder for single-acting, and structural feature is: the left side movable end can change the swept volume of oil hydraulic cylinder, thereby regulates frequency of the natural hydraulic mode; Right side elastic tip output vibration.Exchange valve 6 and rotate selector valve for threeway profile shaft flow, structural feature is: two shoulders of spool and valve pocket are circumferentially evenly offered notch on edge, axial relevant position, notch mutual dislocation on spool two shoulders, spool notch number is 4, and the valve pocket window number is 6, and the spool revolution can make and exchange valve commutation 12 times.
During work, the spool that exchanges valve 6 rotates continuously, and when valve core rotation during to position shown in Figure 3, P-A is logical, and pressure oil enters the flutter cylinder, and the distortion of oil hydraulic cylinder elastic tip is outstanding; When valve core rotation when the position shown in Figure 4, T-A is logical, the flutter cylinder takes back oil circuit, the oil hydraulic cylinder elastic tip is replied; Valve port A and valve port P and T alternate conduction, the oil hydraulic cylinder elastic tip produces flutter.Because the flow area of valve port size is directly proportional with the Face contact ratio that spool and valve pocket are linked up notch, can regulate amplitude by the axial displacement of control spool.The frequency of okperation f of electrohydraulic fluttering device equals to exchange the product of the spool rotation speed n of valve and the revolution break-make number of times m between spool notch and the valve pocket window.If the spool notch is counted Z
1With valve pocket window number Z
2Equate that after spool turned over several angle, valve port was all opened, and was open-shed, the break-make number of times of spool revolution is the spool notch and counts Z
1, flow area is whole valve port area sums, therefore, can pass through bigger flow, flutter device amplitude is relatively large.Improve frequency of okperation for making open-shed exchange valve, need on spool, open a large amount of notches, the valve core structure more complicated, diameter is bigger, and difficulty of processing also increases.If spool notch number and valve pocket window number are unequal, after spool turned over several angle, the part valve port was opened, and was the part open type, the break-make number of times of revolution.The flow area of part open type is littler than open-shed, but can satisfy the amplitude requirement of flutter device by the increase width of rebate.Because it is little to exchange the valve core rotation inertia of valve, be in again in the fine lubricating status, long-time high rotary speed working also is reliably, realizes on the engineering that the technical difficulty of electrohydraulic fluttering device dither is less.
In the present embodiment, side at cylinder body has two oilholes that are communicated with last lower oil cavitie respectively, two oilholes link together by high-pressure ball valve, utilize the control of high-pressure ball valve realization to two oilhole break-makes, when the flutter cylinder working, upper and lower cavity disconnects, and the fluid of epicoele covers in elastic tip its generation is vibrated with exchanging the valve on-off action, and cavity of resorption fluid is isolated; When needs are regulated the volume of epicoele, high-pressure ball valve is opened, upper and lower cavity is communicated with, make upper and lower cavity pressure equate, thereby be easy to regulate the cylinder body volume.
Claims (5)
1. novel high-frequency electrohydraulic fluttering generator, comprise and exchange valve and flutter cylinder, described flutter cylinder comprises cylinder body, described cylinder side wall has a turnover oilhole, and described interchange valve comprises valve body, valve pocket, spool and drives the rotational power mechanism of valve core rotation and drive the sliding power mechanism that spool slides; Described valve body is provided with a filler opening, an oil outlet and a return opening, and described oil outlet is communicated with described turnover oilhole, and described filler opening and return opening are communicated with hydraulic oil source; Have the valve pocket that inserts for spool in the described valve body, the outer suit valve pocket of described spool, it is characterized in that: described cylinder interior is the ring-type cavity volume, described filler opening is connected with the oilhole at cylinder body intermediolateral column center by the oilhole of cylinder base, one end of described cylinder body is installed the elasticity end cap that is connected with load, the described cylinder body the other end installs and fixes end cap, piston is installed in the described cylinder body, the sidewall of described piston and described cylinder body and middle post jamb are tightly connected, described piston is connected with the piston drive mechanism that moves up and down in order to the drive piston, described piston is divided into epicoele and cavity of resorption with the ring-type cavity volume, the inboard wall of cylinder block of described epicoele and cavity of resorption all has the balance hydraulic fluid port, two balance hydraulic fluid ports are communicated with by the balance oil duct, on the described balance oil duct high-pressure ball valve are installed.
2. novel high-frequency electrohydraulic fluttering generator as claimed in claim 1, it is characterized in that: described piston drive mechanism comprises piston rod, connecting plate and screw mandrel, described piston is fixedlyed connected with an end of described piston rod, the other end of described piston rod is fixedlyed connected with connecting plate, described connecting plate is connected by snap ring with an end of screw mandrel, described screw mandrel is provided with external thread section, described external thread section is installed in the tapped hole of leading screw bearing, tightening nut is installed on the described external thread section, described leading screw bearing is fixedlyed connected with described cylinder body, and described cylinder body is installed on the fixed support.
3. novel high-frequency electrohydraulic fluttering generator as claimed in claim 2 is characterized in that: the other end of described big piston is installed adjustable lever.
4. as the described novel high-frequency electrohydraulic fluttering generator of one of claim 1～3, it is characterized in that: in the described interchange valve, 4 shoulders are arranged on the spool, wherein two shoulders in the outside are for supporting shoulder, and inboard two shoulders are circumferentially evenly being processed Z respectively
1Individual notch, Z
1Be even number, and the notch mutual dislocation on the shoulder of n 〉=4, two; Valve pocket is opened 4 group windows vertically, and the spacing between two shoulders of spacing between the adjacent window apertures and inboard equates that middle 1 group window is along circumferentially evenly offering Z
2Individual T type window, Z
2Be even number, Z
2=Z
1+ 2, Z is circumferentially evenly offered on 3 groups of edges, the outside
2Individual rectangular window, from the radial cross section direction, the position consistency of each group window.
5. as the described novel high-frequency electrohydraulic fluttering generator of one of claim 1～3, it is characterized in that: the oilhole at described cylinder body intermediolateral column center and described elasticity end cap over against.
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| CN 201110025190 CN102080679B (en) | 2011-01-24 | 2011-01-24 | Novel high-frequency electro-hydraulic flutter generator |
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| CN 201110025190 CN102080679B (en) | 2011-01-24 | 2011-01-24 | Novel high-frequency electro-hydraulic flutter generator |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102287423A (en) * | 2011-08-11 | 2011-12-21 | 浙江大学 | Outflow-type micro-stoke double-acting exciting hydraulic cylinder |
| CN102305227A (en) * | 2011-08-11 | 2012-01-04 | 浙江大学 | Micro-stroke double-action vibration-exciting hydraulic cylinder |
| CN102562722A (en) * | 2011-12-26 | 2012-07-11 | 浙江工业大学 | High-frequency electro-hydraulic vibration mechanism |
| CN103042260A (en) * | 2012-11-09 | 2013-04-17 | 浙江工业大学 | High-frequency micro-amplitude vibration milling device of splicing quenched mould steel |
| CN104514769A (en) * | 2014-12-30 | 2015-04-15 | 天津福云天翼科技有限公司 | Symmetric double-plunger hydraulic cylinder with planar static pressure bearing |
| CN110939631A (en) * | 2019-12-26 | 2020-03-31 | 长安大学 | Oil-free hydraulic vibration exciter with adjustable frequency and amplitude and adjusting method thereof |
| CN112855648A (en) * | 2021-03-23 | 2021-05-28 | 同济大学 | Multi-redundancy shaft flow distribution servo valve |
| CN113328555A (en) * | 2021-05-31 | 2021-08-31 | 江苏金陵智造研究院有限公司 | High-temperature-resistant limited-angle servo motor system for valve |
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| DE3338739A1 (en) * | 1983-05-07 | 1984-11-08 | Kuroda Precision Industries Ltd., Kawasaki, Kanagawa | CUTTING LIQUID FEEDING DEVICE |
| CN101858373A (en) * | 2010-06-10 | 2010-10-13 | 浙江工业大学 | High-frequency electrohydraulic fluttering generator |
| CN201636422U (en) * | 2009-11-21 | 2010-11-17 | 浙江工业大学 | Driving device for large-flow high-frequency electro-hydraulic exciting control valve |
| CN202082203U (en) * | 2011-01-24 | 2011-12-21 | 浙江工业大学 | Novel high-frequency electrohydraulic flutter generator |
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| DE3338739A1 (en) * | 1983-05-07 | 1984-11-08 | Kuroda Precision Industries Ltd., Kawasaki, Kanagawa | CUTTING LIQUID FEEDING DEVICE |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102287423A (en) * | 2011-08-11 | 2011-12-21 | 浙江大学 | Outflow-type micro-stoke double-acting exciting hydraulic cylinder |
| CN102305227A (en) * | 2011-08-11 | 2012-01-04 | 浙江大学 | Micro-stroke double-action vibration-exciting hydraulic cylinder |
| CN102287423B (en) * | 2011-08-11 | 2013-09-18 | 浙江大学 | Outflow-type micro-stoke double-acting exciting hydraulic cylinder |
| CN102305227B (en) * | 2011-08-11 | 2013-10-23 | 浙江大学 | Micro-stroke double-action vibration-exciting hydraulic cylinder |
| CN102562722A (en) * | 2011-12-26 | 2012-07-11 | 浙江工业大学 | High-frequency electro-hydraulic vibration mechanism |
| CN103042260A (en) * | 2012-11-09 | 2013-04-17 | 浙江工业大学 | High-frequency micro-amplitude vibration milling device of splicing quenched mould steel |
| CN103042260B (en) * | 2012-11-09 | 2014-10-15 | 浙江工业大学 | High-frequency micro-amplitude vibration milling device of splicing quenched mould steel |
| CN104514769A (en) * | 2014-12-30 | 2015-04-15 | 天津福云天翼科技有限公司 | Symmetric double-plunger hydraulic cylinder with planar static pressure bearing |
| CN110939631A (en) * | 2019-12-26 | 2020-03-31 | 长安大学 | Oil-free hydraulic vibration exciter with adjustable frequency and amplitude and adjusting method thereof |
| CN112855648A (en) * | 2021-03-23 | 2021-05-28 | 同济大学 | Multi-redundancy shaft flow distribution servo valve |
| CN113328555A (en) * | 2021-05-31 | 2021-08-31 | 江苏金陵智造研究院有限公司 | High-temperature-resistant limited-angle servo motor system for valve |
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| CN102080679B (en) | 2013-01-16 |
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