CN105545982A - High-power magnetorheological constant acceleration soft start device and control system thereof - Google Patents
High-power magnetorheological constant acceleration soft start device and control system thereof Download PDFInfo
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- CN105545982A CN105545982A CN201610076992.5A CN201610076992A CN105545982A CN 105545982 A CN105545982 A CN 105545982A CN 201610076992 A CN201610076992 A CN 201610076992A CN 105545982 A CN105545982 A CN 105545982A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D35/00—Fluid clutches in which the clutching is predominantly obtained by fluid adhesion
Abstract
The invention discloses a high-power magnetorheological constant acceleration soft start device and a control system thereof, and belongs to the field of magnetorheological fluid transmission. The high-power magnetorheological constant acceleration soft start device and the control system thereof comprise a device part and a control part. The device part is in a double-disc magnetorheological fluid transmission mode, the working faces of two transmission discs are provided with radial strip grooves, the space between the two discs is filled with magnetorheological fluid, and a magnet exciting coil is wound around the two discs. The control part is composed of a data processor, a master controller, a sensor, a current controller and a hydraulic cylinder control valve. The largest torsional moment of the magnetorheological soft start device is improved by pressurizing the magnetorheological fluid and changing the surface structures of the inner wall faces of the two discs, and a constant acceleration soft start system is controlled in the starting process.
Description
Technical field
The present invention relates to a kind of magnetic rheological soft startor, especially a kind of high-power magnetorheological perseverance accelerates soft starting device and control system thereof.
Background technique
Magnetic flow liquid is a kind of novel intellectual material, and when without externally-applied magnetic field, it presents low viscosity class Newtonian fluid characteristic.And when externally-applied magnetic field, by liquid form good for rheological properties, similar solid-state material can be become within the time of Millisecond, and once magnetic field is ineffective, will liquid state be returned to again.Magnetic flow liquid under magnetic fields in magnetic flow liquid magnetic-particle can form the microstructures such as logical chain, side chain, Isolated Chains and column chain, and the end of all kinds of microstructure of molecular chain easily ruptures, therefore, shear mode is merely relied on to be difficult to improve the yield strength of magnetic flow liquid.But when magnetic flow liquid is subject to the additional positive pressure along magnetic direction in magnetic field, its shearing stress can obtain larger raising, or even improve an order of magnitude.This method by applying pressure change magnetorheological fluid performance and so-called magnetic flow liquid Extrusion Strengthening Technique.Magnetic flow liquid forms post chain microstructure and does not also shear, the ferromagnetic particle in magnetic flow liquid and be just present in relative movement between transmission wall, and this phenomenon is wall slippage, reduces even to avoid wall slippage can improve the solidification intensity of magnetic flow liquid.Due to this excellent rheological properties of magnetic flow liquid, it is widely used in fields such as machinery, automobiles.Domestic patent: CN100359198C discloses a kind of magnetic rheological soft startor, and driving link is made cavity, places the driven member that shape matches with it in it, produces magnetic field increase its torsional moment by two groups of electromagnetic coils.CN102297213B discloses a kind of Multi-plate magnetorheological soft start device, adopts multidisc structure, increases the excursion of moment of torsion, can realize the controllable soft start of heavy duty equipment.CN102359513B discloses a kind of Water-cooled magnetorheological soft start device, adopts multiple master, the structural type that driven cylinder gap is arranged, increases the torsional moment of soft starting device.Above-mentioned magnetic rheological soft startor increases torsional moment and mainly contains two kinds of modes: on the one hand by increasing the electric current of field coil, and then increasing magnetic field, improves the solidification intensity of magnetic flow liquid.The electric current increasing field coil can increase torsional moment within the specific limits effectively, but after magnetic flow liquid reaches magnetic saturation, the electric current increasing field coil then cannot continue to improve torsional moment.On the other hand, form multiple damping cavity by the quantity increasing friction plate, thus increase soft starting device maximum twist moment.But the quantity increasing friction plate not only makes device more complicated, is difficult to carry out processing and assembling, and operating difficulties, and reliability can not be guaranteed.And above-mentioned magnetic rheological soft startor does not realize effective control to its starting loop.
Summary of the invention
In order to solve the problem, the invention provides a kind of high-power magnetorheological perseverance and accelerate soft starting device and control system thereof, on the one hand when magnetic intensity reaches magnetic flow liquid saturation magnetic field intensity, the pressure increasing magnetic flow liquid can continue to increase its solidification intensity, drastically increases the maximum twist moment of soft starting device.On the other hand, radial groove is set on the surface of disk, reduces the wall slippage after magnetic flow liquid solidification, increase the maximum twist moment of soft starting device.And by the intelligent control to field current size and magnetic flow liquid pressure, and then realize the control to magnetic current and liquid flow variation characteristic, and the perseverance finally realizing magneto-rheological fluid soft starting device is accelerated to start.
The present invention in order to the technological scheme solving its technical problem and adopt is: a kind of high-power magnetorheological perseverance accelerates soft starting device and control system thereof, is divided into device section and control section; High-power magnetic rheological soft startor part comprises left magnetic conductive shell, fluid/pressure measurement port, bearing (ball) cover, round nut, tapered roller bearing, driving shaft, initiatively disk, magnetism resistent ring, field coil, seal ring, feed liquor/pressurization port, driven disk, right magnetic conductive shell, tapered roller bearing, round nut, driven shaft and bearing (ball) cover.Left magnetic conductive shell and right magnetic conductive shell are fastened by screw and are fixed together, the bearing (ball) cover with seal ring is fixed by screw in the end of left magnetic conductive shell, driving shaft is connected with left magnetic conductive shell by a pair tapered roller bearing, tapered roller bearing is fixed by round nut, initiatively disk is fixed by screws in the right-hand member of driving shaft, driven shaft is fixed on right magnetic conductive shell by a pair tapered roller bearing, the bearing (ball) cover with seal ring is fixed by screw in right magnetic conductive shell end, driven disk is fixed by screws in the left end of driven shaft, at active disk, driven disk and left magnetic conductive shell, field coil is provided with successively in the groove that right magnetic conductive shell is formed, magnetism resistent ring, seal ring, magnetism resistent ring is provided with and injects magnetic flow liquid and to the feed liquor/pressurization port of magnetic flow liquid pressurization and the fluid/pressure measurement port of discharging magnetic flow liquid and measurement magnetic flow liquid pressure.
Further, the gap 1.5-2mm initiatively between disk and brake puck.
Further, initiatively the internal surface of disk and brake puck all has radial streak groove, reduces the wall slippage of magnetic flow liquid and disk, improves the transmission capacity after magnetic flow liquid solidification.
High-power magnetorheological perseverance accelerates the control section of soft starting device, comprises input end speed probe, output terminal rotating speed and rotating speed acceleration transducer, field coil current sensor, magnetic flow liquid pressure transducer, data processing system, growth data connection device, MCU controller, field coil current controller and oil hydraulic cylinder supercharger control valve.
Wherein, input end speed probe, output terminal rotating speed and rotating speed acceleration transducer, field coil current sensor, magnetic flow liquid pressure transducer detects input end rotating speed respectively by corresponding probe, output terminal rotating speed and rotating speed acceleration, field coil electric current and magnetic flow liquid pressure, and data are transferred to data processor for analysis process, according to certain communication protocol, data are issued growth data connection device and MCU controller, the detection aggregation of data that MCU controller is sent according to the buffer value preset and data processing system calculates, the reference data of field coil electric current and cylinder pressure is calculated by certain algorithmic rule, according to control law, before field coil electric current reaches capacity value, MCU processor can not provide the control signal of pressure increase to oil hydraulic cylinder, field coil current reference data will send to field coil current controller, and then be working control electric current by current reference data transformations, in like manner, cylinder pressure reference data will send to oil hydraulic cylinder supercharger control valve, be actual hydraulic pressure pressure by pressure reference data transformations.Meanwhile, the field coil electric current that MCU controller calculates and the reference data of cylinder pressure also will feed back to data processing system by communication protocol, and then issue growth data connection device by data processing system with reference to data.In working procedure, each sensor of a whole set of control system is by continuous firing, collect the work state information of high-power magnetic rheological soft startor at any time, by data processing system, these information and the buffer value that can obtain by growth data connection device are together issued MCU processor, for adjusting the control to field coil current controller and oil hydraulic cylinder supercharger control valve at any time.
When output terminal rotating speed is consistent with input speed, MCU processor will control field coil electric current by field coil current controller and oil hydraulic cylinder supercharger control valve and cylinder pressure keeps currency constant, and maintains this value before input speed changes or load torque changes.
Further, master controller comprises MCU controller, data collection processor, A/D converter and D/A converter; Wherein, MCU controller is mainly used in the control of logical function, and A/D converter and data processing system are mainly used in pick-up transducers data, and D/A converter is for controlling field coil current controller and additional mechanical supercharging controller.
Further, data collection processor comprises data processing system, pressure data acquisition module, current data acquisition module, input end speed data acquisition module, output terminal speed data acquisition module, output terminal acceleration information acquisition module, growth data connection device and corresponding A/D converter; Wherein, the data delivery processed for completing the real-time process to each sensing data, and uses in order to controlling to MCU controller by data processing system; Pressure data acquisition module can gather the pressure data of magnetic flow liquid medium, by A/D converter, data is transferred to data processor processes; Current data acquisition module can gather the current data in electromagnetic coil, by A/D converter, data is transferred to data processor processes; Initiatively the speed acquisition module of axle head and driven axle head is respectively used to the angular velocity gathering initiatively axle head and driven axle head, transfers to data processing system to compare data by A/D converter; The speed that driven axle head acceleration acquisition module increases for gathering driven axle head rotating speed, for the buffer speed of this high-power magneto-rheological fluid soft starting device of closed loop control after data processor processes; Growth data connection device is for connecting upper-position unit or programming card, each sensing data is real-time transmitted on upper-position unit or programming card, realize the state of this high-power magneto-rheological fluid soft starting device of monitoring in real time, and the buffer speed of this high-power magneto-rheological fluid soft starting device can be set by upper-position unit or programming card.
Further, Auxiliary Damping controller comprises field coil and oil hydraulic cylinder control valve; Wherein, field coil can change the magnetic intensity in magnetic flow liquid medium, the pressure that oil hydraulic cylinder control valve exports for changing oil hydraulic cylinder, and then controls the pressure of the rear magnetic flow liquid of solidification.
The present invention is compared with background technique, and the gain effect had is:
(1) surface of driving disk of the present invention has radial streak groove, reduces the wall slippage of magnetic flow liquid and disk, improves the transmission capacity after magnetic flow liquid solidification.
(2) the present invention increases given current value to produce corresponding electromagnetic quantities by controller to magnetoelectricity coil, thus strengthens the shear yield strength of magnetorheological medium; By changing hydraulic jack to magnetic flow liquid medium applied pressure value, the auxiliary shear yield stress increasing the magnetic flow liquid medium after solidifying, improves its transmission capacity.And by the servocontrol to field current and pressure, finally realize the soft start of load device.
(3) the present invention is on the basis of said structure, sensor information and the operation information of this high-power magneto-rheological fluid soft starting device can be monitored with upper-position unit or programming card in real time by growth data connection device, and the starting loop of this high-power magneto-rheological fluid soft starting device can be changed in real time.
(4) electric current that gathered by data collection processor of Auxiliary Damping controller and pressure data carry out closed loop control, ensure that the servo control performance of magneto-rheological fluid soft starting device.
Accompanying drawing explanation
Fig. 1 is system architecture schematic diagram of the present invention
Fig. 2 is apparatus structure schematic diagram of the present invention
Fig. 3 is Two-stage control schematic diagram of the present invention
Fig. 4 is driving disk structural representation of the present invention
In accompanying drawing: 1 left magnetic conductive shell, 2 fluids/pressure measurement port, 3 bearing (ball) covers, 4 round nuts, 5 tapered roller bearings, 6 driving shafts, 7 active disks, 8 magnetism resistent rings, 9 field coils, 10 seal rings, 11 feed liquors/pressurization port, 12 driven disks, 13 right magnetic conductive shells, 14 tapered roller bearings, 15 round nuts, 16 driven shafts, 17 bearing (ball) covers.
Embodiment
Below in conjunction with drawings and Examples, the invention will be further described:
As shown in Figure 1, a kind of high-power magnetorheological perseverance accelerates soft starting device and control system thereof, is divided into device section and control section;
As shown in Figure 2, high-power magnetic rheological soft startor part comprises left magnetic conductive shell 1, fluid/pressure measurement port 2, bearing (ball) cover 3, round nut 4, tapered roller bearing 5, driving shaft 6, initiatively disk 7, magnetism resistent ring 8, field coil 9, seal ring 10, feed liquor/pressurization port 11, driven disk 12, right magnetic conductive shell 13, tapered roller bearing 14, round nut 15, driven shaft 16 and bearing (ball) cover 17.Left magnetic conductive shell 1 is fastened by screw with right magnetic conductive shell 13 and is fixed together, the bearing (ball) cover 3 with seal ring is fixed by screw in the end of left magnetic conductive shell 1, driving shaft 6 is connected with left magnetic conductive shell 1 by a pair tapered roller bearing 5, tapered roller bearing 5 is compressed location by round nut 4, initiatively disk 7 is fixed by screws in the right-hand member of driving shaft 6, driven shaft 16 is fixed on right magnetic conductive shell 13 by tapered roller bearing 14, the bearing (ball) cover 17 with seal ring is fixed by screw in right magnetic conductive shell 13 end, driven disk 12 is fixed by screws in the left end of driven shaft 16, at active disk 7, driven disk 12 and left magnetic conductive shell 1, field coil 9 is provided with successively in the groove that right magnetic conductive shell 13 is formed, magnetism resistent ring 8, seal ring 10, magnetism resistent ring 8 is provided with and injects magnetic flow liquid and to the feed liquor/pressurization port 11 of magnetic flow liquid pressurization and the fluid/pressure measurement port 2 of discharging magnetic flow liquid and measurement magnetic flow liquid pressure.
In field coil 9, pass into electric current, have the magnetic field producing between the active disk 7 of radial groove and driven disk 12 and there is certain magnetic induction intensity on surface, and magnetic intensity increases with electric current and increases.Magnetic flow liquid in two disk gaps forms post chain microstructure at magnetic direction, and moment is semisolid by liquid state, and its solidification intensity becomes large along with the enhancing in magnetic field, thus initiatively disk drives driven disk rotational, and then realizes soft start.After magnetic flow liquid reaches magnetic saturation, the size of current increased in field coil 9 no longer can improve the braking torque of break.Now, by pressurization port, magnetic flow liquid is pressurizeed, magnetic flow liquid shearing stress can be improve more greatly, thus larger starting torque is provided.
The control section of high-power magnetic rheological soft startor, comprises input end speed probe, output terminal rotating speed and rotating speed acceleration transducer, field coil current sensor, magnetic flow liquid pressure transducer, data processing system, growth data connection device, MCU controller, field coil current controller and oil hydraulic cylinder supercharger control valve.
The concrete controlling method of said structure is as follows:
(1) pressure data acquisition module, current data acquisition module, initiatively axle head speed data acquisition module, driven axle head speed data acquisition module and driven axle head acceleration information acquisition module gather the current information in electromagnetic coil, the pressure information in magnetic flow liquid medium, initiatively axle head and driven axle head rotary speed information and driven axle head acceleration information respectively, by A/D converter by these information transmission to data processing system;
(2) information of data processing system to data collecting module collected processes, on the one hand the information after process is sent to upper-position unit or programming card by growth data connection device, on the other hand these information are sent to MCU processor by data/address bus;
(3) MCU processor is by the damping control information obtained magnetic flow liquid medium of active axle head and driven axle head rotary speed information and driven axle head acceleration information and the buffer speed preset being compared;
(4) MCU processor obtains to field coil and oil hydraulic cylinder control valve by analyzing the current information in field coil and the pressure information in magnetic flow liquid medium control information respectively, and obtain corresponding control command, then these instructions are sent to Auxiliary Damping controller by D/A converter;
(5) Auxiliary Damping controller is by changing the electric current of field coil, thus controls the magnetic intensity in magnetic flow liquid medium, and then changes the shear yield strength of magnetic flow liquid medium; By the folding degree of hydraulic control cylinder control valve, and then change the pressure that hydraulic jack is applied to magnetic flow liquid in high-power magneto-rheological fluid soft starting device;
(6) MCU processor also can send to data processing system to the control information of electromagnetic coil and oil hydraulic cylinder control valve by data/address bus, by data processing system, information is sent to upper-position unit or programming card by growth data connection device;
(7) data processing system also constantly will gather and processes the information coming from data acquisition module and growth data connection device, and these information are sent to MCU processor, for adjusting the buffer speed of this high-power magneto-rheological fluid soft starting device and the closed loop control to Auxiliary Damping controller in real time.
As shown in Figure 3, must carry out after magnetic flow liquid solidification owing to pressurizeing, the present invention proposes the Two-level Control method based on magnetic flow liquid.
Under one-level input condition, data processing system is to the input speed of motor, and high-power magnetorheological perseverance is accelerated the output speed of soft starting device and is carried out gathering and carry out speed discrepancy through adder and solve, its signal delivers to PID controller, reconcile through PID, provide the variate-value that one-level exports, i.e. the current output value of field coil, magnetic flow liquid solidification intensity can be increased with this, and then the object improving torsional moment can be reached.
When data processing system is analyzed the high-power magnetorheological perseverance curved line relation accelerated between the current value of soft starting device and output speed, the current induced magnetic field of field coil makes magnetic flow liquid reach magnetic saturation, now saturated switch closes, unlatching secondary inputs, and MCU controller is from being advanced into Two-stage control state.
When secondary inputs, first system maintains the state of one-level input, simultaneously, open oil hydraulic cylinder solenoid directional control valve, constantly gather the delivery pressure of oil hydraulic cylinder simultaneously, this pressure signal is delivered to MCU controller and carries out PID control, by improving constantly the delivery pressure of oil hydraulic cylinder, and then constantly increase the torsional moment that high-power magnetorheological perseverance accelerates soft starting device, finally ensure that it accelerates to start as required.
Claims (5)
1. high-power magnetorheological perseverance accelerates soft starting device and a control system thereof, it is characterized in that being divided into high-power magnetorheological perseverance to accelerate soft starting device part and control section.
High-power magnetic rheological soft startor part, comprises left magnetic conductive shell (1), fluid/pressure measurement port (2), bearing (ball) cover (3), round nut (4), tapered roller bearing (5), driving shaft (6), initiatively disk (7), magnetism resistent ring (8), field coil (9), seal ring (10), feed liquor/pressurization port (11), driven disk (12), right magnetic conductive shell (13), tapered roller bearing (14), round nut (15), driven shaft (16) and bearing (ball) cover (17).Left magnetic conductive shell (1) and right magnetic conductive shell (13) are fastened by screw and are fixed together, the bearing (ball) cover (3) with seal ring is fixed by screw in the end of left magnetic conductive shell (1), driving shaft (6) is connected with left magnetic conductive shell (1) by a pair tapered roller bearing (5), tapered roller bearing (5) is fixed by round nut (4), initiatively disk (7) is fixed by screws in the right-hand member of driving shaft (6), driven shaft (16) is fixed on right magnetic conductive shell (13) by a pair tapered roller bearing (14), the bearing (ball) cover (17) with seal ring is fixed by screw in right magnetic conductive shell (13) end, driven disk (12) is fixed by screws in the left end of driven shaft (16), in active disk (7), driven disk (12) and left magnetic conductive shell (1), field coil (9) is provided with successively in the groove that right magnetic conductive shell (13) is formed, magnetism resistent ring (8), seal ring (10), magnetism resistent ring (8) is provided with and injects magnetic flow liquid and to the feed liquor/pressurization port (11) of magnetic flow liquid pressurization and the fluid/pressure measurement port (2) of discharging magnetic flow liquid and measurement magnetic flow liquid pressure.
The control section of high-power magnetic rheological soft startor, comprises input end speed probe, output terminal rotating speed and rotating speed acceleration transducer, field coil current sensor, magnetic flow liquid pressure transducer, data processing system, growth data connection device, MCU controller, field coil current controller and oil hydraulic cylinder supercharger control valve.
Wherein, input end speed probe, output terminal rotating speed and rotating speed acceleration transducer, field coil current sensor, magnetic flow liquid pressure transducer detects input end rotating speed respectively by corresponding probe, output terminal rotating speed and rotating speed acceleration, field coil electric current and magnetic flow liquid pressure, and data transferred to data processing system to carry out analysing and processing, according to certain communication protocol, data are issued growth data connection device and MCU controller, the detection aggregation of data that MCU controller is sent according to the buffer value preset and data processing system calculates, the reference data of field coil electric current and cylinder pressure is calculated by certain algorithmic rule, according to control law, when the current induced magnetic field of field coil does not make before magnetic flow liquid reaches magnetic saturation, MCU processor can not provide the control signal of pressure increase to oil hydraulic cylinder, field coil current reference data will send to field coil current controller, and then be working control electric current by current reference data transformations.When the current induced magnetic field of field coil makes magnetic flow liquid reach magnetic saturation, cylinder pressure reference data will send to oil hydraulic cylinder supercharger control valve, be actual hydraulic pressure pressure by pressure reference data transformations.Meanwhile, the field coil electric current that MCU controller calculates and the reference data of cylinder pressure also will feed back to data processing system by communication protocol, and then issue growth data connection device by data processing system with reference to data.In working procedure, each sensor of a whole set of control system is by continuous firing, collect the work state information of high-power magnetic rheological soft startor at any time, by data processing system, these information and the buffer value that can obtain by growth data connection device are together issued MCU processor, for adjusting the control to field coil current controller and oil hydraulic cylinder supercharger control valve at any time.
When output terminal rotating speed is consistent with input speed, MCU processor will control field coil electric current by field coil current controller and oil hydraulic cylinder supercharger control valve and cylinder pressure keeps currency constant, and maintains this value before input speed changes or load torque changes.
2. the high-power magnetorheological perseverance of one according to claim 1 accelerates soft starting device and control system thereof, it is characterized in that: initiatively the working surface of disk and driven disk has radial streak groove, and groove width is 2mm, and the degree of depth is 0.5mm.
3. the high-power magnetorheological perseverance of one according to claim 1 accelerates soft starting device and control system thereof, it is characterized in that: described active disk and the gap of driven disk are 1.5-2mm.
4. the high-power magnetorheological perseverance of one according to claim 1 accelerates soft starting device and control system thereof, it is characterized in that: the data that control procedure all detects by respective sensor also contrast the data pre-entering or set and carry out closed loop control.
5. the high-power magnetorheological perseverance of one according to claim 1 accelerates soft starting device and control system thereof, it is characterized in that: can as main frame connect programming card setting soft start time acceleration and monitor each sensing data, also can connect computer as from machine, acceleration when setting soft start in real time by upper-position unit also monitors each sensing data.
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| CN201610076992.5A CN105545982B (en) | 2016-01-31 | 2016-01-31 | A kind of high-power magnetorheological permanent acceleration soft starting device with control system |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107830080A (en) * | 2017-12-04 | 2018-03-23 | 洛阳理工学院 | A kind of new magnetic flow liquid freewheel clutch |
| CN111810556A (en) * | 2020-07-20 | 2020-10-23 | 中国矿业大学 | Hydraulic extrusion type magnetorheological fluid clutch |
| CN114734084A (en) * | 2022-02-14 | 2022-07-12 | 上海应用技术大学 | Control system applied to billet shearing machine and billet shearing machine |
| CN107830080B (en) * | 2017-12-04 | 2024-05-14 | 洛阳理工学院 | Novel magneto-rheological fluid overrunning clutch |
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| CN85203125U (en) * | 1985-07-27 | 1986-06-11 | 第二汽车制造厂 | Silicon oil fan clutch with oil scraping pin |
| CN102878225A (en) * | 2012-10-14 | 2013-01-16 | 吉林大学 | Multiple-piece magneto-rheological fluid torque transferring device |
| CN104019152A (en) * | 2014-06-11 | 2014-09-03 | 浙江师范大学 | Piston-type magneto-rheological clutch |
| CN104114893A (en) * | 2012-02-08 | 2014-10-22 | 博格华纳公司 | Fluid friction clutch |
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| US4227861A (en) * | 1979-02-14 | 1980-10-14 | General Motors Corporation | Cooling fan with viscous-magnetic fan clutch |
| CN85203125U (en) * | 1985-07-27 | 1986-06-11 | 第二汽车制造厂 | Silicon oil fan clutch with oil scraping pin |
| CN104114893A (en) * | 2012-02-08 | 2014-10-22 | 博格华纳公司 | Fluid friction clutch |
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| CN107830080A (en) * | 2017-12-04 | 2018-03-23 | 洛阳理工学院 | A kind of new magnetic flow liquid freewheel clutch |
| CN107830080B (en) * | 2017-12-04 | 2024-05-14 | 洛阳理工学院 | Novel magneto-rheological fluid overrunning clutch |
| CN111810556A (en) * | 2020-07-20 | 2020-10-23 | 中国矿业大学 | Hydraulic extrusion type magnetorheological fluid clutch |
| CN111810556B (en) * | 2020-07-20 | 2024-04-26 | 中国矿业大学 | Hydraulic extrusion type magnetorheological fluid clutch |
| CN114734084A (en) * | 2022-02-14 | 2022-07-12 | 上海应用技术大学 | Control system applied to billet shearing machine and billet shearing machine |
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| CN105545982B (en) | 2018-02-13 |
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