CN102261360A - Multi-waveform hydraulic rotary valve for hydraulic vibration exciter - Google Patents
Multi-waveform hydraulic rotary valve for hydraulic vibration exciter Download PDFInfo
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Abstract
本发明公开了一种用于液压激振器的多波形液压转阀，包括阀座和阀芯，该阀座内设有内腔，该内腔的侧壁上设有分别径向贯穿内腔的B通道和D通道，该阀芯与B通道和D通道相对应的位置上分别开设有径向延伸贯穿阀芯的B导流槽和D导流槽；以面向阀芯左端的阀芯横截面为正面，该B导流槽的其一槽口相对于第一上通孔逆时针错开π/8，该D导流槽的其一槽口相对于第二上通孔顺时针错开π/8；内腔的侧壁上还设有径向贯穿上述内腔的，且其轴线与上述B通道的轴线处于同一平面上并相互平行的C通道，阀芯与C通道相对应的位置上开设有径向延伸贯穿阀芯的C导流槽。本发明的液压转阀，可根据实际工作需要进行增加或关闭相应油路来产生不同形式的脉动波，适用范围广。
The invention discloses a multi-waveform hydraulic rotary valve used for a hydraulic exciter, which comprises a valve seat and a valve core. The valve seat is provided with an inner cavity, and the side walls of the inner cavity are respectively provided with radially penetrating inner cavities. B channel and D channel, the spool corresponding to the B channel and D channel are respectively provided with B diversion groove and D diversion groove extending radially through the spool; The cross section is the front side, one of the notches of the B diversion groove is staggered counterclockwise by π/8 relative to the first upper through hole, and one notch of the D diversion groove is staggered clockwise by π/8 relative to the second upper through hole 8. On the side wall of the inner cavity, there is also a C channel that runs through the above-mentioned inner cavity radially, and whose axis is on the same plane as the axis of the above-mentioned B channel and is parallel to each other. There is a C guide groove extending radially through the spool. The hydraulic rotary valve of the present invention can generate different forms of pulsation waves by increasing or closing corresponding oil passages according to actual work needs, and has a wide range of applications.
Description
Technical field
The present invention relates to a kind of hydraulic reversing valve that is used to hydraulic vibration exciter that vibration source is provided.
Background technique
Vibration exciter is in order to the generation excitation force, and this excitation force can be applied to the device on other structures and the equipment.Existing vibration exciter has multiple structural types such as inertia-type, electrodynamic type, electromagnetic type, electrolyte type, pneumatic type, hydraulic type, wherein the principle of hydraulic type vibration exciter is to utilize the break-make shunting of fluid to produce vibration, it has, and volume is little, in light weight, power big, compact structure, and can provide high pressure oil with hydraulic station independently, be beneficial to separating of the energy and actuator, reduce advantages such as rate of fault, then hydraulic vibration exciter becomes the main flow of this application gradually, is widely used in industrial departments such as mine, traffic, building, building materials, metallurgy.
The existing many waveforms hydraulic reversing valve that is used for hydraulic vibration exciter, as on March 9th, 2005 disclosed publication number be disclosed four stopcocks that are used for hydraulic vibration exciter of CN2683910Y utility model patent, it comprise have liquid entering hole, the valve seat of liquid return hole, oil hydraulic cylinder connection mouth, be actively tied in the axis in the valve seat, axis middle part is set and is engaged in the cylindrical body spool of valve base cavity, on spool, offer two cross guiding gutters of 45 ° that stagger mutually.Axis is by motor driving during work, make the spool rotation, the spool cylndrical surface makes liquid entering hole or liquid return hole block, by the cross guiding gutter liquid entering hole or liquid return hole are connected with the oil hydraulic cylinder connection mouth simultaneously with the oil hydraulic cylinder connection mouth according to this, constitutes high pressure liquid, reflux liquid passage in turn; Like this, the spool revolution is crossed 45 ° of vibrations once, and four sinuous pulsation ripples of output rotate a circle.Yet this four stopcocks that are used for hydraulic vibration exciter can only be exported four continuous sinuous pulsation ripples during work, and the form of the pulsating wave of its output is comparatively single, and Applicable scope is little.
In view of above-mentioned reason, the inventor furthers investigate the structure of the hydraulic reversing valve that is used for hydraulic vibration exciter, and this case produces thus.
Summary of the invention
The purpose of this invention is to provide a kind of many waveforms hydraulic reversing valve that is used for hydraulic vibration exciter, its exportable multi-form pulsating wave, applied widely.
Technological scheme of the present invention is such: a kind of many waveforms hydraulic reversing valve that is used for hydraulic vibration exciter, comprise valve seat and spool, be provided with inner chamber in this valve seat, the sidewall of this inner chamber is provided with B passage and the D passage that radially runs through inner chamber respectively, B passage and D passage are formed with and are symmetricly set on respectively on the inner chamber, and each aperture all identical first on through hole, through hole on first lower through-hole and second, second lower through-hole, the axis of the axis of B passage and D passage is in the same plane and be parallel to each other, on first on the through hole and second through hole extend and to merge together, and common open forms the oil hydraulic cylinder connection mouth on valve seat, and first lower through-hole and second lower through-hole extend valve seat respectively separately and form liquid entering hole, liquid return hole; Spool activity accumbency is installed in the inner chamber of valve seat, and an end of spool extends to outside the valve seat, offer B guiding gutter and the D guiding gutter that radially extends through spool on this spool and B passage and the corresponding position of D passage respectively, this B guiding gutter and D guiding gutter are the identical cross recess of internal diameter of through hole on the internal diameter and first of its each notch; With the spool cross section towards spool left side is the front, and the one notch of this B guiding gutter is with respect to π/8 of staggering counterclockwise of through hole on first, and the one notch of this D guiding gutter is with respect to π/8 of staggering clockwise of through hole on second; Also be provided with on the sidewall of above-mentioned inner chamber and radially run through above-mentioned inner chamber, and the axis of its axis and above-mentioned B passage is in the same plane and the C-channel that is parallel to each other, this C-channel is formed with and is symmetricly set on the above-mentioned inner chamber, and its aperture its be 1/2 times of the aperture of through hole on first the 3rd on through hole and the 3rd lower through-hole, through hole is connected with above-mentioned oil hydraulic cylinder connection mouth on the above-mentioned the 3rd, above-mentioned the 3rd lower through-hole is connected with above-mentioned liquid entering hole, offer the C guiding gutter that radially extends through spool on above-mentioned spool and the corresponding position of above-mentioned C-channel, the internal diameter that above-mentioned C guiding gutter includes through hole on each notch internal diameter and the 3rd is identical, and the mutual first little cross recess second little cross recess that connects that intersects, the above-mentioned first little cross recessed one notch is with respect to π/16 of staggering counterclockwise of through hole on the above-mentioned the 3rd, the above-mentioned second little cross recessed one notch is with respect to through hole on the above-mentioned the 3rd stagger counterclockwise 3 π/16 or π/4, and above-mentioned valve seat is provided with and controls above-mentioned B passage and above-mentioned C-channel conducting or B switch valve that ends and C switch valve respectively.
Also be provided with on the sidewall of above-mentioned inner chamber and radially run through above-mentioned inner chamber, and the axis of its axis and above-mentioned B passage is in the same plane and the A channel that is parallel to each other, this A channel is formed with and is symmetricly set on the above-mentioned inner chamber, and on its aperture and first aperture of through hole identical the 4th on through hole and the 4th lower through-hole, through hole is connected with above-mentioned oil hydraulic cylinder connection mouth on the 4th, above-mentioned the 4th lower through-hole is connected with above-mentioned liquid entering hole, offer the A guiding gutter that radially extends through spool on above-mentioned spool and the corresponding position of above-mentioned A channel, above-mentioned A guiding gutter is 2 times the cross recess in the aperture in through hole footpath on the 4th for its each notch internal diameter, and this cross recessed one notch is with respect to 3 π/16 of staggering counterclockwise of through hole on the above-mentioned the 4th, the A switch valve that above-mentioned valve seat is provided with the above-mentioned A channel conducting of control or ends.
Above-mentioned C-channel is provided with two, the all corresponding above-mentioned C-channel setting of through hole, above-mentioned the 3rd lower through-hole, above-mentioned C guiding gutter and above-mentioned C switch valve on the above-mentioned the 3rd, and the first little cross recessed one notch of above-mentioned one C guiding gutter staggers π/16, the second little cross recessed one notch with respect to 3 π/16 of staggering counterclockwise of through hole on the above-mentioned the 3rd counterclockwise with respect to through hole on the above-mentioned the 3rd; The first little cross recessed one notch of above-mentioned another C guiding gutter staggers π/16, the second little cross recessed one notch with respect to π/4 of staggering counterclockwise of through hole on the above-mentioned the 3rd counterclockwise with respect to through hole on the above-mentioned the 3rd.
Above-mentioned B switch valve be with above-mentioned first on the suitable bolt-type switch of through hole, above-mentioned valve seat is positioned at that the position of through hole offers and the suitable mounting hole of B switch valve on first, and this mounting hole is provided with through hole on first is vertical, the afterbody of this B switch valve embeds in the through hole on above-mentioned first and through hole on first is isolated into two chambers that are not conducted mutually, the head of above-mentioned B switch valve stretches out outside the above-mentioned mounting hole, and above-mentioned B switch valve is positioned at towards the position of above-mentioned one chamber and is concaved with short slot.
Above-mentioned C switch valve be with the above-mentioned the 3rd on the suitable bolt-type switch of through hole, above-mentioned valve seat is positioned at that the position of through hole offers and the suitable mounting hole of C switch valve on the 3rd, and this mounting hole is provided with through hole on the 3rd is vertical, the afterbody of this C switch valve embeds in the through hole on the above-mentioned the 3rd and through hole on the 3rd is isolated into two chambers that are not conducted mutually, the head of above-mentioned C switch valve stretches out outside the above-mentioned mounting hole, and above-mentioned C switch valve is positioned at towards the position of above-mentioned one chamber and is concaved with short slot.
Above-mentioned A switch valve be with the above-mentioned the 4th on the suitable bolt-type switch of through hole, above-mentioned valve seat is positioned at that the position of through hole offers and the suitable mounting hole of A switch valve on the 4th, and this mounting hole is provided with through hole on the 4th is vertical, the afterbody of this A switch valve embeds in the through hole on the above-mentioned the 4th and through hole on the 4th is isolated into two chambers that are not conducted mutually, the head of above-mentioned A switch valve stretches out outside the above-mentioned mounting hole, and above-mentioned A switch valve is positioned at towards the position of above-mentioned one chamber and is concaved with short slot.
After adopting such scheme, the invention has the beneficial effects as follows: can increase or close corresponding oil circuit according to need of work during use, make spool can export continuous sawtooth pulsating wave and continuous sinuous pulsation ripple, and sawtooth wave is applicable to the fixed pulse vibration of thump, sine wave is applicable to the demanding impulse oscillation of stationarity, and is applied widely.
Description of drawings
Fig. 1 is a partial sectional view of the present invention;
Fig. 2 is the plan view of upper connection piece among the present invention;
Fig. 3 is the cut-away view along A-B direction among Fig. 2;
Fig. 4 is the structural representation of B switch valve among the present invention;
Fig. 5 is the initial phase bitmap of A, B, C1, C2, D among the present invention;
Fig. 6 is the phase diagram of high-pressure oil passage and low pressure oil circuit during first working state among the present invention;
Fig. 7 is the phase diagram of high-pressure oil passage and low pressure oil circuit during second working state among the present invention;
Fig. 8 is the phase diagram of high-pressure oil passage and low pressure oil circuit during the 3rd working state among the present invention;
Fig. 9 is a sawtooth wave flow periodogram;
Figure 10 is continuous sinuous pulsation wave current amount periodogram;
Figure 11 is a rectangular wave flow periodogram;
Figure 12 is the partial sectional view of the present invention's first use condition;
Figure 13 is the partial sectional view of the present invention's second use condition.
Embodiment
The many waveforms hydraulic reversing valve that is used for hydraulic vibration exciter of the present invention as Figure 1-3, comprises valve seat and spool 1, wherein:
Valve seat comprises upper connection piece 2, lower contact piece 3, protecgulum 4, bonnet 5, and the hollow cylinder 6 of both ends open, upper connection piece 2, lower contact piece 3 is installed in respectively on the both sides outer wall of hollow cylinder 6, offer oil hydraulic cylinder connection mouth 21 on the upper connection piece 2, offer liquid entering hole 31 and liquid return hole 32 on the lower contact piece 3, protecgulum 4, bonnet 5 is covered in respectively on the both ends open of hollow cylinder 6, and offer the axial hole that connects protecgulum 4 on the protecgulum 4, spool 1 activity is embedded in the cavity of hollow cylinder 6, and be accumbency and place, the left side of spool 1, right-hand member is by bearing 71,72 are actively tied in protecgulum 4, on the bonnet 5, and the right-hand member of spool 1 passes the axial center hole of protecgulum 4 to valve seat, and seal by the seal ring 81 that is set on the spool 1 between the right-hand member of spool 1 and the axial center hole, this seal ring 81 cooperates spacing in axial center hole by loose rib 82 with check ring 83.
The sidewall of hollow casing 6 is provided with the A that radially runs through inner chamber respectively, B, C1, C2, the D passage, A, B, C1, C2, the D passage is formed with the last through hole 22 on the symmetrical respectively coaxial sidewall that is arranged on hollow casing 6,23,24,25,26 and lower through- hole 33,34,35,36,37, and last through hole 22,23,26 with each lower through- hole 33,34,37 aperture is all identical, last through hole 24,25 and lower through- hole 35,36 aperture is 1/2 times of aperture of through hole 22, A, B, C1, C2, the axis of D passage is all in the same plane and be parallel to each other, the last aperture of last through hole 22, the last aperture of last through hole 23, the last aperture of last through hole 24, the last aperture of last through hole 25 and the last aperture of last through hole 26 extend upwardly to respectively in the upper connection 2 and with the oil hydraulic cylinder connection mouth 21 of upper connection 2 and are connected, the following aperture of lower through-hole 33, the following aperture of lower through-hole 34, the following aperture of lower through-hole 35 and the following aperture of lower through-hole 36 extend downward respectively in the lower contact 3 and with the liquid entering hole 31 of lower contact 3 and are connected, and the following aperture of lower through-hole 37 extends downward in the lower contact 3 and with the liquid return hole 32 of lower contact 3 and is connected.
The working principle that is used for many waveforms hydraulic reversing valve of hydraulic vibration exciter of the present invention is: the right-hand member of spool 1 is by motor driving, spool 1 is rotated in hollow casing 6, this moment hollow casing 6 sidewall can stop up according to this or conducting upper connection piece 2 on each on each lower through-hole on through hole and the lower contact piece 3, thereby constitute high-pressure oil passage and low pressure oil circuit in turn.
Wherein high-pressure oil passage has four groups of A, B, C1, C2, wherein A group high-pressure oil passage is: high pressure liquid enters from the liquid entering hole 31 of lower contact piece 3, flow into a notch of the cross recess 61 of spool 1 by the lower through-hole 33 that is communicated with it, and through another notch of symmetrically arranged cross recess 61, flow in the last through hole 22 of upper connection piece 2, flow out from the oil hydraulic cylinder connection mouth 21 that is connected with last through hole 22 at last; B group high-pressure oil passage is: high pressure liquid enters from the liquid entering hole 31 of lower contact piece 3, flow into a notch of the cross recess 62 of spool 1 by the lower through-hole 34 that is communicated with it, and through another notch of symmetrically arranged cross recess 62, flow in the last through hole 23 of upper connection piece 2, flow out from the oil hydraulic cylinder connection mouth 21 that is connected with last through hole 23 at last; C1 group high-pressure oil passage is: high pressure liquid enters from the liquid entering hole 31 of lower contact piece 3, flow into by the lower through-hole 35 that is communicated with it in the one notch of the one notch of cross recess 64 of spools 1 or cross recess 65, and warp is to another notch of symmetrically arranged cross recess 64 or another notch of cross recess 65, flow in the last through hole 24 of upper connection piece 2, flow out from oil hydraulic cylinder connection mouth 21 at last with last through hole 24; C2 group high-pressure oil passage is: high pressure liquid enters from the liquid entering hole 31 of lower contact piece 3, flow into by the lower through-hole 36 that is communicated with it in the one notch of the one notch of cross recess 66 of spools 1 or cross recess 67, and warp is to another notch of symmetrically arranged cross recess 66 or another notch of cross recess 67, flow in the last through hole 25 of upper connection piece 2, flow out from oil hydraulic cylinder connection mouth 21 at last with last through hole 25.
The low pressure oil circuit is oil hydraulic cylinder connection mouth 21 inflows of the interior low hydraulic fluid of oil hydraulic cylinder from upper connection piece 2, in the notch of cross recess 63 through flow into spool 1 by the last through hole 26 that is communicated with it, and through another notch of symmetrically arranged cross recess 63, flow in the lower through-hole 37 of lower contact piece 3, flow out from the liquid return hole 32 that is connected with lower through-hole 37 at last, be back in the hydraulic oil container.
The many waveforms hydraulic reversing valve that is used for hydraulic vibration exciter of the present invention, the original state that is decided to be spool with the phase place of each guiding gutter in shown in Figure 5, A-A represents the phase diagram of A guiding gutter among the figure, B-B represents the phase diagram of B guiding gutter, C1-C1 represents the phase diagram of C1 guiding gutter, C2-C2 represents the phase diagram of C2 guiding gutter, and D-D represents the phase diagram of D guiding gutter, among the figure 1 of each phase diagram, 2,3,4...... represents that oilhole connects in proper order.
The many waveforms hydraulic reversing valve that is used for hydraulic vibration exciter of the present invention, it has three kinds of working staties, and first kind of working state is: close A switch valve and C switch valve, open the B switch valve, be B high-pressure oil passage, the work of low pressure oil circuit, be the positive veer of spool in a clockwise direction, shown in Fig. 6 (a), when spool goes to (4n+1) π/8 (n=0,1,2,3......) B group high-pressure oil passage is connected constantly the time, and the low pressure oil circuit ends; Shown in Fig. 6 (b) when spool go to (4n+3) π/8 (n=0,1,2,3......) the low pressure oil circuit is connected constantly the time, B group high-pressure oil passage ends; Then as shown in Figure 9, in valve core rotation one during week, principle according to geometric superposition in the fluid mechanics, the flow cyclic curve that can calculate oil hydraulic cylinder this moment is a sawtooth wave, because sawtooth wave is precipitous relatively, forward meeting at spool and produce bigger oil shock, this moment, the hydraulic reversing valve of working state was applicable in the fixed pulse vibration of thump.
During second kind of working state, close the A switch valve, open B switch valve and C1 switch valve, be i.e. B high-pressure oil passage, C1 high-pressure oil passage and the work of low pressure oil circuit, be the positive veer of spool in a clockwise direction, shown in Fig. 7 (a), when spool goes to n π/16 (n=1,3,9,11,17......) constantly for pulsing the zero hour, this moment, high-pressure oil passage began to connect; Shown in Fig. 7 (b), when spool go to (4n+1) π/8 (n=0,1,2, constantly be that flow is constantly maximum 3......), this moment, B group high-pressure oil passage was connected fully, C1 organize high-pressure oil passage and the low pressure oil circuit obstructed; Shown in Fig. 7 (c), when spool go to n π/4 (n=0,1,2,3......) constantly for pulsation stops constantly, this moment, B group, C1 group high-pressure oil passage were closed fully.Like this, in valve core rotation one during week, according to the principle of geometric superposition in the fluid mechanics, the sine wave that the flow cyclic curve that can calculate oil hydraulic cylinder is, as shown in figure 10, promptly the hydraulic reversing valve of this kind working state is applicable in the demanding impulse oscillation of stationarity.
During the third working state, close the B switch valve, open A switch valve and C2 switch valve, promptly A high-pressure oil passage, C2 high-pressure oil passage and the work of low pressure oil circuit are the positive veer of spool in a clockwise direction, shown in Fig. 8 (a), when spool goes to (4n+1) π/16 (n=0,1,2,3......) constantly for pulsing the zero hour, this moment, A, C2 group high-pressure oil passage began to connect; Shown in Fig. 8 (b), when spool goes to (n
1+ 8n
2) π/8 (n
1=2,3,4; n
2=0,1,2, constantly be that flow is constantly maximum 3......), this moment, A group high-pressure oil passage was connected fully, and C2 group high-pressure oil passage and low tension oil circuit are obstructed; Shown in Fig. 8 (c), when spool go to (6+8n) π/16 (n=0,1,2,3......) constantly be pulsation finish time, this moment, A, C2 group high-pressure oil passage was closed fully.Like this, during one week, according to the principle of geometric superposition in the fluid mechanics, the flow cyclic curve that can calculate oil hydraulic cylinder is a rectangular wave in valve core rotation, and as shown in figure 11, promptly the hydraulic reversing valve of this kind working state is applicable in the impulse oscillation that requires stage oil pressure maintenance.
Among the present invention, in order to increase the sealing of valve seat, all establishing transposition in the joint that upper connection piece 2, lower contact piece 3, protecgulum 4, bonnet 5 are connected with hollow casing 6 has seal ring.
Among the present invention, in use, for the shearing stress that prevents spool is weakened, can be separately positioned on C1 guiding gutter and C2 guiding gutter on two spools, shown in Figure 12,13, promptly the one spool is provided with A, B, C1, D guiding gutter, and another spool is provided with A, B, C2, D guiding gutter, like this, can change spool according to the different operating occasion.
Among the present invention, can increase or close corresponding oil circuit according to the real work needs and produce sawtooth wave, sine wave and continuous rectangular wave.
The present invention is many waveforms hydraulic pressure shock wave device of the geometric superposition principle design in the utilization fluid mechanics, can be advantageously applied to high frequency, high pressure, the removable workplace of many waveforms.The present invention has good application prospects and value in hydraulic exciting, reversing arrangement application.
Claims (6)
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| CN201110191990.8A CN102261360B (en) | 2011-07-08 | 2011-07-08 | Multi-waveform hydraulic rotary valve for hydraulic vibration exciter |
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|---|---|---|---|
| CN201110191990.8A CN102261360B (en) | 2011-07-08 | 2011-07-08 | Multi-waveform hydraulic rotary valve for hydraulic vibration exciter |
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| CN102261360A true CN102261360A (en) | 2011-11-30 |
| CN102261360B CN102261360B (en) | 2014-06-18 |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102840193A (en) * | 2012-09-10 | 2012-12-26 | 太原理工大学 | Water pressure fluctuation excitation device |
| CN102966643A (en) * | 2012-11-22 | 2013-03-13 | 裕东（中山）机械工程有限公司 | Mechanical rotary pulse gas generator |
| CN104747520A (en) * | 2015-03-20 | 2015-07-01 | 辽东学院 | Hydraulic shock excitation rotation reversing valve |
| CN108204469A (en) * | 2017-12-10 | 2018-06-26 | 浙江伟星新型建材股份有限公司 | The dual-purpose high frequency rotary valve of novel gas-liquid |
| CN111828439A (en) * | 2020-06-16 | 2020-10-27 | 浙大城市学院 | A high frequency hydraulic exciter |
| CN113669318A (en) * | 2021-08-03 | 2021-11-19 | 华侨大学 | Rotary Shaft Controlled Hydraulic Control Check Valve Distribution Radial Piston Hydraulic Device |
| CN114811117A (en) * | 2022-02-24 | 2022-07-29 | 浙江工业大学 | High-frequency one-way sinusoidal flow control valve |
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| CN102966643A (en) * | 2012-11-22 | 2013-03-13 | 裕东（中山）机械工程有限公司 | Mechanical rotary pulse gas generator |
| CN102966643B (en) * | 2012-11-22 | 2015-06-17 | 裕东（中山）机械工程有限公司 | mechanical rotary pulse gas generator |
| CN104747520A (en) * | 2015-03-20 | 2015-07-01 | 辽东学院 | Hydraulic shock excitation rotation reversing valve |
| CN104747520B (en) * | 2015-03-20 | 2017-11-28 | 辽东学院 | Hydraulic exciting rotates reversal valve |
| CN108204469A (en) * | 2017-12-10 | 2018-06-26 | 浙江伟星新型建材股份有限公司 | The dual-purpose high frequency rotary valve of novel gas-liquid |
| CN108204469B (en) * | 2017-12-10 | 2019-09-10 | 浙江伟星新型建材股份有限公司 | The dual-purpose high frequency rotary valve of novel gas-liquid |
| CN111828439A (en) * | 2020-06-16 | 2020-10-27 | 浙大城市学院 | A high frequency hydraulic exciter |
| CN111828439B (en) * | 2020-06-16 | 2022-08-09 | 浙大城市学院 | High-frequency hydraulic vibration exciter |
| CN113669318A (en) * | 2021-08-03 | 2021-11-19 | 华侨大学 | Rotary Shaft Controlled Hydraulic Control Check Valve Distribution Radial Piston Hydraulic Device |
| CN113669318B (en) * | 2021-08-03 | 2023-05-05 | 华侨大学 | Hydraulic device with hydraulic control check valve flow distribution radial plunger controlled by rotating shaft |
| CN114811117A (en) * | 2022-02-24 | 2022-07-29 | 浙江工业大学 | High-frequency one-way sinusoidal flow control valve |
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