CN201586915U - Ripple control system used for air bag polishing - Google Patents
Ripple control system used for air bag polishing Download PDFInfo
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- CN201586915U CN201586915U CN2009202024753U CN200920202475U CN201586915U CN 201586915 U CN201586915 U CN 201586915U CN 2009202024753 U CN2009202024753 U CN 2009202024753U CN 200920202475 U CN200920202475 U CN 200920202475U CN 201586915 U CN201586915 U CN 201586915U
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- valve
- air bag
- pressure
- polishing
- cavity volume
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Abstract
The utility model relates to a ripple control system used for air bag polishing, which comprises an air bag polishing mechanism, an air source and a driver. The air bag polishing mechanism comprises an air containing cavity, a rubber air bag and a retainer; the retainer is connected with a direct current motor; a pressure sensor for detecting the practical pressure in the airbag is arranged on the rubber airbag; the driver comprises a first magnet valve for communicating the air source with the air containing cavity, and a second magnet valve for communicating the air containing cavity with atmosphere; the first magnet valve and the second magnet valve are controlled by a timer of the driver, which can produce control square wave to control the opening and closing of the two magnet valves; the air source is connected with a 2D valve with periodically changed valve port area and causing the charge pressure of the rubber air bag to be periodically changed; the 2D valve is connected with the air containing cavity and controlled by a central processing unit; and pressure signals sensed by the pressure sensor are transmitted to the central processing unit. The pulse control system has the advantages that the surface quality of dies can be rapidly improved, and the polishing time is short.
Description
Technical field
The utility model relates to a kind of pulse controlling system that is used for air bag polishing.
Technical background
The air bag polishing process is a kind of new aspheric surface polishing method that optical laboratory, 20th century London nineties proposes, its operation principle is, to be filled with the rubber pneumatic bag and the motor interlock of gas, rubber pneumatic bag is contacted with die surface and air bag rotates at a high speed, thereby reach the purpose of polishing.But in traditional air bag polishing technology, the blowing pressure of rubber pneumatic bag inside is a steady state value, and polishing time and technological parameter are consistent, and the contact stress between air bag and die surface can not change, the polishing duration.
Summary of the invention
Use the shortcoming of duration for the polishing that overcomes prior art, the utility model provides a kind of rubber pneumatic bag internal inflation pressure that makes to be cyclically-varying, back and forth changing appears in the contact performance between air bag and die surface, can improve the surface quality of mould fast, the pulse controlling system that is used for air bag polishing that the polishing time spent is short.
The pulse controlling system that is used for air bag polishing comprises the driver that air bag polishing mechanism, source of the gas, the described air bag polishing of driving mechanism polish mould; Described air bag polishing mechanism comprises the gas cavity volume that is communicated with source of the gas, to the rubber pneumatic bag of workpiece polishing, described rubber pneumatic bag is fixed on the retainer, described retainer is by a main shaft and a direct current motor interlock, described main shaft is provided with the air flue that is communicated with gas cavity volume and rubber pneumatic bag, and described rubber pneumatic bag is provided with the pressure sensor that detects actual pressure in the air bag;
Described driver comprises first magnetic valve with source of the gas and the connection of gas cavity volume, with second magnetic valve of gas cavity volume and atmosphere connection, described first magnetic valve and second magnetic valve are controlled by producing of described driver and control square wave to control the timer of two magnetic valve open and closes;
Described source of the gas is cyclically-varying with a valve port area, make the blowing pressure of rubber pneumatic bag be periodically variable 2D valve is connected, and described 2D valve is connected with described gas cavity volume, and described 2D valve is controlled by a central processing unit; The pressure signal of described pressure sensor induction transfers to described central processing unit.
Further, described 2D valve comprises valve body, multipole AC servo motor, the moment enlarger, spool and valve pocket, described multipole AC servo motor is installed on the valve body, the output shaft of described multipole AC servo motor is connected with described moment enlarger input, the output of described moment enlarger is fixedlyed connected with the front end of described spool, described valve pocket sealing is installed in the valve body, described spool is installed in rotation in the valve pocket, the left end of described spool, valve pocket and back shroud constitute sensitive cavity, spool land surface in the described sensitive cavity has a pair of axisymmetric pressure hole and a pair of axisymmetric low pressure hole, described pressure hole and low pressure hole all are completely arc, the bowstring of described pressure hole is parallel with the bowstring in low pressure hole, the inner surface of the valve pocket that described sensitive cavity is outer is provided with a pair of axisymmetric helicla flute, described spiral fluted one end is communicated with described sensitive cavity, and the described spiral fluted other end covers adjacent pressure hole bowstring and the zone between the bowstring of low pressure hole; Central processing unit is connected to 2D valve step motor control end, and the anglec of rotation of control step motor is with the openings of sizes of control 2D valve.
Further, described moment enlarger comprises gear and escapement, and described gear is installed on the output shaft of multipole AC servo motor, the upper end of described escapement and described gears engaged, and fixedly connected with spool in the lower end of described escapement.
Further again, described multipole AC servo motor is fixedlyed connected with motor mounting plate, and described output shaft passes described motor mounting plate, and described motor mounting plate is provided with spacer pin, have fan-shaped stopper slot on the described gear, described spacer pin is positioned at described stopper slot.
Further, the radially angle between the center in the center of adjacent pressure hole and low pressure hole is 90 degree; On the described spool concentric ring is installed, the right-hand member of described spool is installed right plug ring.
Further, described main shaft is connected with the infrared tube of a monitoring speed of mainshaft, the speed of mainshaft that described infrared tube is sensed is sent in the described central controller, be provided with the spindle speed signal conditioning that infrared tube is sensed in the described central controller and be the conditioning module of square-wave signal, with square-wave signal and the comparison module of representing the default square wave of main shaft preset rotation speed to compare.
Further, described gas cavity volume and shows that the Pressure gauge of cavity volume internal pressure is connected.
Further, described first magnetic valve is a normal open type two-bit triplet magnetic valve, closes when connecting power supply; Described second magnetic valve is a closed type two-bit triplet magnetic valve, conducting when connecting power supply.
Further, but the manual adjustments module of described central processing unit manual adjustments dc motor speed and control duty cycle square wave, described manual adjustments module comprises the numerical key of representing 0-9, the dutycycle that is connected, is provided with the control duty cycle square wave with timer is provided with button, the rotating speed that is connected, is provided with the motor output speed with direct current generator is provided with button, the real-time reset key that shows the display module of the actual pressure of pressure sensor induction and the actual speed of mainshaft that infrared tube is sensed and central processing unit is reverted to original state.
Technical conceive of the present utility model is: the timer by driver produces the control square wave, it is pwm pulse, when pwm pulse is in low level state, first solenoid valve conduction, second closed electromagnetic valve, source of the gas is inflated in the gas cavity volume, makes the pressure in the gas cavity volume consistent with the output pressure of source of the gas; When pwm pulse is in high level state, first closed electromagnetic valve, second solenoid valve conduction, the gas cavity volume is exitted to atmosphere; Thereby two magnetic valves realize that according to pulse signal conducting constantly, closure cyclically-varying appears in the pressure in the gas cavity volume, rubber pneumatic bag is communicated with the gas cavity volume, cyclically-varying also appears in the pressure in the rubber pneumatic bag, and the contact stress between rubber pneumatic bag and the polishing workpiece is cyclically-varying.
For making pressure in the gas cavity volume keep being the cyclically-varying of rule, actual pressure in the gas cavity volume that central processing unit is sensed pressure sensor and a preset pressure value are relatively, when the actual pressure in the gas cavity volume during greater than preset pressure value, by the 2D valve of central processing unit control connection to atmosphere, make it atmosphere is exitted, thereby gradually reduce the actual pressure in the gas cavity volume,, close this 2D valve this moment to preset pressure; When the actual pressure in the gas cavity volume during less than preset pressure value, by the 2D valve of central processing unit control connection, make it source of the gas is inflated it, thereby progressively increase actual pressure in the gas cavity volume to preset pressure to source of the gas, close this 2D valve this moment.
In the polishing process, the direct current chance produces speed loss because of the main shaft load, influence the speed of the contact zone of air bag and polished workpiece, for keeping the needed rotary speed of glossing, central processing unit is set rotating ratio with the speed of mainshaft and one that infrared tube monitors, when the speed of mainshaft is higher than the setting rotating speed, by the value of central processing unit timer internal is set, reduce the PWM dutycycle of control motor, make the average voltage of motor input reduce, thereby make rotating speed reduce; When the speed of mainshaft is lower than the setting rotating speed, by the value of central processing unit timer internal is set, increase the PWM dutycycle of control motor, make the average voltage of motor input strengthen, thereby make rotating speed raise.
When needs manually change the dutycycle of control square wave, press dutycycle earlier button is set, and by the dutycycle of numerical key input respective value with adjusting control square wave.
When needs manually change the rotating speed of direct current generator, press rotating speed earlier button is set, can adjust the rotating speed of direct current generator again by numerical key input respective value.
The beneficial effects of the utility model are: utilize two magnetic valve periodic duties of pulse width modulating technology control, realize the pulse feature regulation and control to the rubber pneumatic bag internal inflation pressure; Follow the tracks of and keep the rotary speed of polishing tool direct current generator simultaneously, realize closed-loop control the rubber pneumatic bag rotating speed.The rubber pneumatic bag internal inflation pressure regularity vibration of certain amplitude occurs with the change of pulse period and dutycycle, makes contacting between air bag and die surface occur back and forth changing, and helps improving the effective property of participation and the material removing rate of abrasive particle.The utility model can improve the surface quality of mould fast.
Description of drawings
Fig. 1 is a schematic diagram of the present utility model
Fig. 2 is a flow chart of the present utility model
Fig. 3 is the schematic diagram of air bag polishing mechanism
Fig. 4 is the structural principle schematic diagram of 2D digital servo valve
Fig. 5 is the enlarged diagram of sensitive cavity
Fig. 6 is the valve core structure schematic diagram
Fig. 7 is the structural representation in full sagitta low pressure hole
Fig. 8 is the D-D profile of Fig. 7
The specific embodiment
With reference to accompanying drawing, further specify the utility model:
The pulse controlling system that is used for air bag polishing comprises air bag polishing mechanism 31, source of the gas 32, drives the driver 33 that 31 pairs of moulds of described air bag polishing mechanism polish; Described air bag polishing mechanism 31 comprises the gas cavity volume 311 that is communicated with source of the gas, rubber pneumatic bag 312, the described rubber pneumatic bag 312 of workpiece polishing is fixed on the retainer 313, described retainer 313 is by a main shaft and a direct current motor interlock, described main shaft is provided with the air flue that is communicated with gas cavity volume and rubber pneumatic bag 312, and described rubber pneumatic bag 312 is provided with the pressure sensor 34 that detects actual pressure in the air bag;
Described driver 33 comprises first magnetic valve 35 with source of the gas 32 and 311 connections of gas cavity volume, with second magnetic valve 36 of gas cavity volume 311 and atmosphere connection, described first magnetic valve 35 and second magnetic valve 36 are controlled by producing of described driver 33 and control square wave to control the timer of two magnetic valve 35,36 open and closes;
Described source of the gas 32 is cyclically-varying with a valve port area, make the blowing pressure of rubber pneumatic bag be periodically variable 2D valve 37 is connected, and described 2D valve 37 is connected with described gas cavity volume 311, and described 2D valve 37 is controlled by a central processing unit 38; The pressure signal of described pressure sensor 34 inductions transfers to described central processing unit 38.
Described 2D valve 37 comprises multipole AC servo motor 27, moment enlarger, servo screw mechanism, spacer pin 3, valve body 26, back shroud 20, lid 6, right plug ring 8, concentric ring 9, motor mounting plate 1, O RunddichtringO 14,15,16,17,18,22 and screw 4,10,11,12,13,19,23,25,28,29,30.
Described multipole AC servo motor 27 is positioned at valve body 26 upper ends as the electromechanical converter that drives digital valve, is connected with motor mounting plate 1 by screw 28,29,30.Lid 6 is connected on the motor mounting plate 1 by screw 4,11,12.
The moment enlarger comprises gear 2 and escapement 5, gear 2 is press fit on the outrigger shaft of multipole AC servo motor 27, is meshed with escapement 5 to constitute the moment enlarger of stable drive ratio, and it is simple in structure, reliable operation effectively reduces the output torque requirement to multipole AC servo motor 27; Excessive for preventing the displacement of the servomotor anglec of rotation, on gear, have fan-shaped stopper slot, the spacer pin 3 on being contained in motor mounting plate 1 constitutes the position-limit mechanism of servo valve.Escapement 5 lower ends link to each other with spool 24, and are fixing by screw 10.
Servo screw mechanism is the control structure of leading of realizing valve core of servo valve corner and axial straight-line displacement (main valve opening) conversion, it comprises spool 24 and valve pocket 21 etc., spool 24 cooperates formation sensitive cavity d with valve pocket 21, back shroud 20, offer two couples of axisymmetric high-low pressure hole f and c on the spool 24 shoulder surfaces near sensitive cavity d end.According to the traffic requirement of servo valve, the high-low pressure hole is full arc high-low pressure hole f and c, and as shown in Figure 4, the bowstring in full sagitta low pressure hole is aimed at helicla flute, with the increased area gradient.Spool 24 is loaded in the valve pocket 21, between the two by O RunddichtringO 15,16,17,18 and 22 sealings, concentric ring 9 and right plug ring 8 is housed to guarantee the location between spool 24, valve pocket 21 and the valve body 26 on the spool 24.Offer a pair of axisymmetric helicla flute on the inner surface of valve pocket 21, an end and the sensitive cavity d of this groove communicate, and the other end and high-low pressure hole f and c constitute the resistance half-bridge, and the resistance half-bridge is by the pressure in the helicla flute control sensitive cavity d.
The design feature of 2D servo valve has determined very little (not the having dead cavity volume substantially) that its sensitive cavity d can design, thereby its hydraulic natural frequency is very high, big scope about 104～105Hz, so high hydraulic natural frequency makes the second order oscillation element exert an influence hardly to the dynamic response of spool 24, the axial displacement of spool 24 does not produce vibration to the response between its anglec of rotation displacement, can be reduced to an inertial element.
Can be taken as zero lap between high-low pressure hole and the helicla flute can guarantee to stablize.Because it is almost nil that zero lap valve makes zero-bit lead the leakage of control flow, and make the static axial rigidity of spool 24 very big, the conversion accuracy between the corner displacement of spool 24 and the axial straight-line displacement (main valve opening) is very high.
Described main shaft is connected with the infrared tube 39 of a monitoring speed of mainshaft, the speed of mainshaft that described infrared tube 39 is sensed is sent in the described central controller 38, be provided with the spindle speed signal conditioning that infrared tube 39 is sensed in the described central controller 38 and be the conditioning module of square-wave signal, with square-wave signal and the comparison module of representing the default square wave of main shaft preset rotation speed to compare.
Described gas cavity volume 311 and one shows that the Pressure gauge 40 of cavity volume internal pressure is connected.
Described first magnetic valve 35 is a normal open type two-bit triplet magnetic valve, closes when connecting power supply; Described second magnetic valve 36 is a closed type two-bit triplet magnetic valve, conducting when connecting power supply.
But the manual adjustments module of described central processing unit 38 manual adjustments dc motor speeds and control duty cycle square wave, described manual adjustments module comprises the numerical key of representing 0-9, the dutycycle that is connected, is provided with the control duty cycle square wave with timer is provided with button, the rotating speed that is connected, is provided with the motor output speed with direct current generator is provided with button, the real-time reset key that shows the display module of the actual pressure of pressure sensor induction and the actual speed of mainshaft that infrared tube is sensed and central processing unit is reverted to original state.
Technical conceive of the present utility model is: the timer by driver 33 produces the control square wave, it is pwm pulse, when pwm pulse is in low level state, 35 conductings of first magnetic valve, second magnetic valve 36 are closed, source of the gas 32 is inflated in gas cavity volume 311, makes the pressure in the gas cavity volume 311 consistent with the output pressure of source of the gas; When pwm pulse was in high level state, first magnetic valve 35 cut out, 36 conductings of second magnetic valve, and gas cavity volume 311 is exitted to atmosphere; Thereby two magnetic valves 35,36 realize that according to pulse signal conducting constantly, closure cyclically-varying appears in the pressure in the gas cavity volume 311, rubber pneumatic bag 312 is communicated with gas cavity volume 311, cyclically-varying also appears in the pressure in the rubber pneumatic bag 312, and the contact stress between rubber pneumatic bag 312 and the polishing workpiece is cyclically-varying.
For making gas cavity volume 311 interior pressure keep being the cyclically-varying of rule, gas cavity volume 311 interior actual pressure and the preset pressure values that central processing unit 38 is sensed pressure sensor 34 compare, when the actual pressure in the gas cavity volume 311 during greater than preset pressure value, by the 2D valve 37 of central processing unit 38 control connections to atmosphere, make it atmosphere is exitted, thereby gradually reduce the actual pressure in the gas cavity volume 311,, close this 2D valve 37 this moment to preset pressure; When the actual pressure in the gas cavity volume 311 during less than preset pressure value, by the 2D valve 37 of central processing unit 38 control connections to source of the gas, make it source of the gas 32 its inflation, thereby progressively increase actual pressure in the gas cavity volume 311, close this 2D valve 37 this moment to preset pressure.
In the polishing process, the direct current chance produces speed loss because of the main shaft load, influence the speed of the contact zone of air bag 312 and polished workpiece, for keeping the needed rotary speed of glossing, central processing unit 38 is set rotating ratio with the speed of mainshaft and one that infrared tube 39 monitors, when the speed of mainshaft is higher than the setting rotating speed, by the value of central processing unit 38 timer internals is set, reduce the PWM dutycycle of control motor, make the average voltage of motor input reduce, thereby make rotating speed reduce; When the speed of mainshaft is lower than the setting rotating speed, by the value of central processing unit 38 timer internals is set, increase the PWM dutycycle of control motor, make the average voltage of motor input strengthen, thereby make rotating speed raise.
When needs manually change the dutycycle of control square wave, press dutycycle earlier button is set, and by the dutycycle of numerical key input respective value with adjusting control square wave.
When needs manually change the rotating speed of direct current generator, press rotating speed earlier button is set, can adjust the rotating speed of direct current generator again by numerical key input respective value.
The described content of this specification embodiment only is enumerating the way of realization of utility model design; protection domain of the present utility model should not be regarded as only limiting to the concrete form that embodiment states, protection domain of the present utility model also reach in those skilled in the art according to the utility model design the equivalent technologies means that can expect.
Claims (9)
1. be used for the pulse controlling system of air bag polishing, it is characterized in that: comprise the driver that air bag polishing mechanism, source of the gas, the described air bag polishing of driving mechanism polish mould; Described air bag polishing mechanism comprises the gas cavity volume that is communicated with source of the gas, to the rubber pneumatic bag of workpiece polishing, described rubber pneumatic bag is fixed on the retainer, described retainer is by a main shaft and a direct current motor interlock, described main shaft is provided with the air flue that is communicated with gas cavity volume and rubber pneumatic bag, and described rubber pneumatic bag is provided with the pressure sensor that detects actual pressure in the air bag;
Described driver comprises first magnetic valve with source of the gas and the connection of gas cavity volume, with second magnetic valve of gas cavity volume and atmosphere connection, described first magnetic valve and second magnetic valve are controlled by producing of described driver and control square wave to control the timer of two magnetic valve open and closes;
Described source of the gas is cyclically-varying with a valve port area, make the blowing pressure of rubber pneumatic bag be periodically variable 2D valve is connected, and described 2D valve is connected with described gas cavity volume, and described 2D valve is controlled by a central processing unit; The pressure signal of described pressure sensor induction transfers to described central processing unit.
2. the pulse controlling system that is used for air bag polishing as claimed in claim 1, it is characterized in that: described 2D valve comprises valve body, multipole AC servo motor, the moment enlarger, spool and valve pocket, described multipole AC servo motor is installed on the valve body, the output shaft of described multipole AC servo motor is connected with described moment enlarger input, the output of described moment enlarger is fixedlyed connected with the front end of described spool, described valve pocket sealing is installed in the valve body, described spool is installed in rotation in the valve pocket, the left end of described spool, valve pocket and back shroud constitute sensitive cavity, spool land surface in the described sensitive cavity has a pair of axisymmetric pressure hole and a pair of axisymmetric low pressure hole, described pressure hole and low pressure hole all are completely arc, the bowstring of described pressure hole is parallel with the bowstring in low pressure hole, the inner surface of the valve pocket that described sensitive cavity is outer is provided with a pair of axisymmetric helicla flute, described spiral fluted one end is communicated with described sensitive cavity, and the described spiral fluted other end covers adjacent pressure hole bowstring and the zone between the bowstring of low pressure hole; Central processing unit is connected to 2D valve step motor control end, and the anglec of rotation of control step motor is with the openings of sizes of control 2D valve.
3. the pulse controlling system that is used for air bag polishing as claimed in claim 2, it is characterized in that: described moment enlarger comprises gear and escapement, described gear is installed on the output shaft of multipole AC servo motor, the upper end of described escapement and described gears engaged, fixedly connected with spool in the lower end of described escapement.
4. the pulse controlling system that is used for air bag polishing as claimed in claim 3, it is characterized in that: described multipole AC servo motor is fixedlyed connected with motor mounting plate, described output shaft passes described motor mounting plate, described motor mounting plate is provided with spacer pin, have fan-shaped stopper slot on the described gear, described spacer pin is positioned at described stopper slot.
5. the pulse controlling system that is used for air bag polishing as claimed in claim 4 is characterized in that: the radially angle between the center in the center of adjacent pressure hole and low pressure hole is 90 degree; On the described spool concentric ring is installed, the right-hand member of described spool is installed right plug ring.
6. the pulse controlling system that is used for air bag polishing as claimed in claim 5, it is characterized in that: described main shaft is connected with the infrared tube of a monitoring speed of mainshaft, the speed of mainshaft that described infrared tube is sensed is sent in the described central controller, be provided with the spindle speed signal conditioning that infrared tube is sensed in the described central controller and be the conditioning module of square-wave signal, with square-wave signal and the comparison module of representing the default square wave of main shaft preset rotation speed to compare.
7. the pulse controlling system that is used for air bag polishing as claimed in claim 6 is characterized in that: described gas cavity volume and shows that the Pressure gauge of cavity volume internal pressure is connected.
8. the pulse controlling system that is used for air bag polishing as claimed in claim 7 is characterized in that: described first magnetic valve is a normal open type two-bit triplet magnetic valve, closes when connecting power supply; Described second magnetic valve is a closed type two-bit triplet magnetic valve, conducting when connecting power supply.
9. as the described pulse controlling system that is used for air bag polishing of one of claim 1-8, it is characterized in that: but the manual adjustments module of described central processing unit manual adjustments dc motor speed and control duty cycle square wave, described manual adjustments module comprises the numerical key of representing 0-9, be connected with timer, the dutycycle that the control duty cycle square wave is set is provided with button, be connected with direct current generator, the rotating speed that the motor output speed is set is provided with button, the real-time reset key that shows the display module of the actual pressure of pressure sensor induction and the actual speed of mainshaft that infrared tube is sensed and central processing unit is reverted to original state.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202024753U CN201586915U (en) | 2009-12-17 | 2009-12-17 | Ripple control system used for air bag polishing |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202024753U CN201586915U (en) | 2009-12-17 | 2009-12-17 | Ripple control system used for air bag polishing |
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| CN201586915U true CN201586915U (en) | 2010-09-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2009202024753U Expired - Fee Related CN201586915U (en) | 2009-12-17 | 2009-12-17 | Ripple control system used for air bag polishing |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101758445B (en) * | 2009-12-17 | 2011-11-23 | 浙江工业大学 | Pulse controlling system for air bag polishing |
| CN102658517A (en) * | 2012-05-07 | 2012-09-12 | 浙江工业大学 | Contact force real-time control system for airbag polishing |
| CN102913496A (en) * | 2012-10-24 | 2013-02-06 | 浙江工业大学 | Bi-directional full-bridge 2D electro-hydraulic proportional directional valve |
| CN106425861A (en) * | 2016-12-06 | 2017-02-22 | 重庆市江津区前进焊接材料厂 | Stable pressure control system for handheld polisher |
-
2009
- 2009-12-17 CN CN2009202024753U patent/CN201586915U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101758445B (en) * | 2009-12-17 | 2011-11-23 | 浙江工业大学 | Pulse controlling system for air bag polishing |
| CN102658517A (en) * | 2012-05-07 | 2012-09-12 | 浙江工业大学 | Contact force real-time control system for airbag polishing |
| CN102913496A (en) * | 2012-10-24 | 2013-02-06 | 浙江工业大学 | Bi-directional full-bridge 2D electro-hydraulic proportional directional valve |
| CN102913496B (en) * | 2012-10-24 | 2015-03-04 | 浙江工业大学 | Bi-directional full-bridge 2D electro-hydraulic proportional directional valve |
| CN106425861A (en) * | 2016-12-06 | 2017-02-22 | 重庆市江津区前进焊接材料厂 | Stable pressure control system for handheld polisher |
| CN106425861B (en) * | 2016-12-06 | 2018-08-31 | 重庆市江津区前进焊接材料厂 | A kind of control system of the hand-held polishing machine of pressure stability |
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| GR01 | Patent grant | ||
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100922 Termination date: 20121217 |