CN101585018A - Centrifuge deceleration method and centrifuge for implementing the method - Google Patents
Centrifuge deceleration method and centrifuge for implementing the method Download PDFInfo
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- CN101585018A CN101585018A CNA2009101150594A CN200910115059A CN101585018A CN 101585018 A CN101585018 A CN 101585018A CN A2009101150594 A CNA2009101150594 A CN A2009101150594A CN 200910115059 A CN200910115059 A CN 200910115059A CN 101585018 A CN101585018 A CN 101585018A
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- centrifuge
- turntable
- asynchronous machine
- threephase asynchronous
- brace table
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Abstract
The invention relates to a centrifuge deceleration method and the centrifuge. The deceleration method is used for decelerating a rotating centrifuge, comprises the following steps: step one: reducing the current frequency inputted into the three-phase asynchronous motor of the centrifuge by a frequency converter to cause the turntable to decelerate preliminarily; step two: changing the power supply phase sequence of the three-phase asynchronous motor according to a set frequency to perform inching type reversal connection brake to the three-phase asynchronous motor, and to cause the turntable to decelerate further; step three: performing friction brake to the turntable by a brake mechanism to stop the rotation of the turntable stably. The invention has the following advantages: By adopting frequency conversion brake, reversal connection brake and friction brake, the invention can stop the rotation of the centrifuge rapidly and stably, increases work efficiency, and saves time.
Description
Technical field
The present invention relates to the retarding method of a kind of centrifuge and centrifuge.
Background technology
The application of centrifuge is very extensive, and when centrifuge rotated, the inertia of centrifuge turntable was very big usually, needs the long period to slow down and stops.Such as in the manufacture process of hollow fiber film assembly, need to adopt centrifuge that encapsulating is carried out at the both ends of hollow-fibre membrane, after finishing, embedding need to make the turntable of centrifuge to stop operating, the hollow fiber film assembly that more renews then carries out the embedding of next round, because it is all bigger to be used to lay the quality of the hanger of hollow fiber film assembly and turntable, therefore the inertia of turntable is very big, existing centrifuge adopts common friction catch, its braking time is longer, has seriously restricted the efficient of producing; In addition, in the friction catch process, the serious wear of brake block and brake rim, friction also can produce spark, brings the potential safety hazard of production; And because when centrifuge was worked, vibrations were relatively more severe, as do not have glissando, can produce bigger noise, and reduce the working life of centrifuge.
Summary of the invention
In order to overcome the deficiencies in the prior art, the purpose of this invention is to provide a kind of method that can brake the centrifuge that is rotating fast and effectively.
For reaching above purpose, the technical scheme that the present invention takes is: a kind of retarding method of centrifuge, be used for the centrifuge that is rotating is slowed down, described centrifuge comprises brace table, is arranged on turntable, threephase asynchronous machine on this brace table rotationally, the output shaft of described threephase asynchronous machine is in transmission connection mutually with turntable, and this retarding method may further comprise the steps:
The first step: reduce to import the power frequency of centrifuge threephase asynchronous machine by frequency converter, described turntable is tentatively slowed down;
Second step: change the power phase of importing threephase asynchronous machine with setpoint frequency, make described threephase asynchronous machine carry out a dynamic formula reversing braking, described turntable further slows down;
The 3rd step: by braking mechanism turntable is carried out friction catch, described turntable is stopped operating stably.
Another object of the present invention provides a kind of centrifuge of implementing above-mentioned retarding method.
For reaching this purpose, the technical scheme that the present invention takes is: a kind of centrifuge, it comprises base, be arranged on the brace table on the described base, be fixedly installed on the threephase asynchronous machine on this brace table, by the rotating turntable that is installed on the described brace table of rotating shaft, described turntable is in transmission connection mutually with described motor, described centrifuge also comprises the frequency converter that is used for described threephase asynchronous machine is carried out frequency conversion, be electrically connected with the input of described threephase asynchronous machine (3) and be used to change the reversal connection control circuit of input power phase and be arranged on braking mechanism on the described brace table, described braking mechanism comprises that fixed packet is trapped among the brake rim in the described rotating shaft outside and is fixedly mounted on brake block on the described brace table.
Preferably, described brace table is connected on the base by a plurality of dampers.
Preferably, be set with a plurality of guide pillars on the described base, described brace table passes described guide pillar slidably, described damper is a spring, described spring housing is in the outside of described guide pillar, and described spring one end is connected on the base, and the other end is connected on the brace table.
Because the enforcement of above technical scheme, the present invention compared with prior art has following advantage: carry out damping owing to be provided with spring, the centrifuge operation is more steady; Centrifuge of the present invention adopts frequency conversion braking, reversing braking, friction catch, can quick and stable make the centrifuge stall, improved operating efficiency, saved the time.
Description of drawings
Accompanying drawing 2 is the A-A cutaway view in the accompanying drawing 1;
Accompanying drawing 3 is the input power cord road figure of threephase asynchronous machine.
Wherein: 1, brace table; 2, turntable; 3, threephase asynchronous machine; 4, base; 5, frequency converter; 6, brake rim; 7, brake block; 8, guide pillar; 9, spring; 10, cylinder; 11, rotating shaft.
The specific embodiment
Below in conjunction with the accompanying drawing and the specific embodiment the present invention is described in further detail:
To shown in the accompanying drawing 3, a kind of retarding method of centrifuge is used for the centrifuge that is rotating is slowed down as accompanying drawing 1.Centrifuge comprises brace table 1, is arranged on turntable 2, threephase asynchronous machine 3 on this brace table 1 rotationally, and the output shaft of threephase asynchronous machine 3 is in transmission connection mutually with turntable 2, and its braking is divided into three steps to be carried out, and three steps are as follows respectively:
The first step: reduce to import the power frequency of centrifuge threephase asynchronous machine 3 by frequency converter 5, turntable 2 is tentatively slowed down;
Second step: change the power phase of importing threephase asynchronous machine 3 with setpoint frequency, make threephase asynchronous machine 3 carry out a dynamic formula reversing braking, turntable 2 further slows down;
The 3rd step: by braking mechanism turntable 2 is carried out friction catch, turntable 2 is stopped operating stably.
The present invention also comprises a kind of centrifuge that can implement above-mentioned centrifuge decelerates method, this centrifuge comprises base 4, be arranged on brace table 1 on the base 4, be fixedly installed on threephase asynchronous machine 3 on this brace table 1, by the rotating shaft 11 rotating turntables 2 that are installed on the brace table 1, turntable 2 is in transmission connection mutually with threephase asynchronous machine 3, and turntable 2 can rotate under the driving of threephase asynchronous machine 3.The brake component of centrifuge comprises and is used for threephase asynchronous machine 3 is carried out the frequency converter 5 of frequency conversion, is electrically connected with the input of described threephase asynchronous machine 3 and is used to change the reversal connection control circuit of input power phase and is arranged on braking mechanism on the brace table 1.
The power input of threephase asynchronous machine 3 is connected with frequency converter 5, threephase asynchronous machine 3 provides electric current by frequency converter 5, frequency converter 5 can change the power frequency of input threephase asynchronous machine 3, and when centrifuge started, frequency converter 5 provided an operating frequency for threephase asynchronous machine 3; When centrifuge decelerates is braked, reduce to import the power frequency of threephase asynchronous machine 3 by frequency converter 5, because power frequency has reduced, the rotating speed of threephase asynchronous machine 3 also descends thereupon, has played the effect of preliminary braking deceleration.
The reversal connection control circuit is arranged between frequency converter 5 and threephase asynchronous machine 3 inputs, the reversal connection control circuit can change the power phase of input threephase asynchronous machine 3, make rotating excitation field reverse, and produce a braking moment, the rotating speed of threephase asynchronous machine 3 is descended.
Braking mechanism comprises that fixed packet is trapped among the brake rim 6 and the brake block 7 that is fixedly mounted on the brace table 1 in rotating shaft 11 outsides, brake block 7 is connected with the piston rod of a cylinder 10, brake block 7 can move under the effect of cylinder 10, when turntable 2 rotates, the brake rim 6 that is fixed on rotating shaft 11 outsides also and then rotates, when carrying out friction catch, cylinder 10 driving brake blocks 7 move brake block 7 are contacted with brake rim 6, produce frictional force between the two the turntable that rotating 2 is slowed down until stopping, the kinetic energy in braking procedure during turntable 2 rotations will be converted to thermal energy consumption and fall.
More steady when centrifuge is rotated, brace table 1 is connected on the base 4 by a plurality of dampers.Be set with a plurality of guide pillars 8 on the base 4, brace table 1 passes guide pillar 8 slidably, and damper is a spring 9, and spring 9 is enclosed within the outside of guide pillar 8, and spring 9 one ends are connected on the base 4, and the other end is connected on the brace table 1.Owing to be provided with guide pillar 8, when centrifuge was worked, brace table 1 was limited to move within limits, can be owing to vibrations depart from too many distance.The damper of present embodiment can effectively absorb by turntable and rotate the vibrations that brought, and centrifuge is more steady during work, and noise is very little.
In the encapsulating process of hollow fiber film assembly, the braking procedure of centrifuge is:
Hollow fiber film assembly is the three-phase current of 50Hz by frequency converter 5 for threephase asynchronous machine 3 provides frequency after placing on the centrifuge turntable 2, and threephase asynchronous machine 3 drives and after turntable 2 quickens to rotate hollow fiber film assembly carried out encapsulating.After doughnut membrane module encapsulating is finished, at first carry out the frequency conversion braking, the power frequency that will import threephase asynchronous machine 3 by frequency converter 5 is reduced to 5Hz, and the time that reduces power frequency is 30 seconds; Carry out reversing braking then, the power frequency that keeps input threephase asynchronous machine 3 this moment is at 5Hz, change the power phase of input threephase asynchronous machine 3 by the reversal connection control circuit, make rotating excitation field reverse, and produce a braking moment, the rotating speed of threephase asynchronous machine 3 is descended, because the inertia when turntable 2 rotates is very big, if remain reversing braking, impulsive force in the braking procedure is stronger, cause the parts damages such as rotating shaft 11 of machine shaft or turntable easily, so when reversing braking, adopt the reversing braking of some dynamic formula, promptly the intermittence of short time is carried out the power phase of reversal connection input threephase asynchronous machine 3, decelerate to when stopping soon until turntable 2, cut off electric current input fully threephase asynchronous machine 3; Carry out friction catch at last, cylinder 10 driving brake blocks 7 move brake block 7 are contacted with brake rim 6, produce frictional force between the two and make the turntable 2 decelerations releasing of brake sheet 7 after stop, turntable 2 stops that rotating, and carry out the operation of next round.
By present embodiment as can be seen, the turntable that adopts the present invention that the very big high speed of inertia is being rotated also stops operating fast stably.
Claims (4)
1, a kind of retarding method of centrifuge, be used for the centrifuge that is rotating is slowed down, described centrifuge comprises brace table (1), is arranged on turntable (2), threephase asynchronous machine (3) on this brace table (1) rotationally, the output shaft of described threephase asynchronous machine (3) is in transmission connection mutually with turntable (2), and it is characterized in that: this retarding method may further comprise the steps:
The first step: reduce to import the power frequency of threephase asynchronous machine (3) by frequency converter (5), make that described turntable (2) is preliminary to slow down;
Second step: change the phase sequence of importing threephase asynchronous machine (3) power supply with setpoint frequency, make described threephase asynchronous machine (3) carry out a dynamic formula reversing braking, described turntable (2) further slows down;
The 3rd step: by braking mechanism turntable (2) is carried out friction catch, described turntable (2) is stopped operating stably.
2, a kind of centrifuge of implementing the method for claim 1, it comprises base (4), be arranged on the brace table (1) on the described base (4), be fixedly installed on the threephase asynchronous machine (3) on this brace table (1), by the rotating turntable (2) that is installed on the described brace table (1) of rotating shaft (11), described turntable (2) is in transmission connection mutually with described threephase asynchronous machine (3), it is characterized in that: described centrifuge also comprises the frequency converter (5) that is used for described threephase asynchronous machine (3) is carried out frequency conversion, be electrically connected with the input of described threephase asynchronous machine (3) and be used to change the reversal connection control circuit of input power phase, be arranged on the braking mechanism on the described brace table (1), described braking mechanism comprises the brake rim (6) that is fixedly installed on described rotating shaft (11) outside and is installed in brake block (7) on the described brace table (1).
3, centrifuge according to claim 2 is characterized in that: described brace table (1) is connected on the described base (4) by a plurality of dampers.
4, centrifuge according to claim 2, it is characterized in that: be set with a plurality of guide pillars (8) on the described base (4), described brace table (1) passes described guide pillar (8) slidably, described damper is spring (9), described spring (9) is enclosed within the outside of described guide pillar (8), described spring (9) one ends are connected on the base (4), and the other end is connected on the brace table (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2009101150594A CN101585018A (en) | 2009-03-10 | 2009-03-10 | Centrifuge deceleration method and centrifuge for implementing the method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2009101150594A CN101585018A (en) | 2009-03-10 | 2009-03-10 | Centrifuge deceleration method and centrifuge for implementing the method |
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| CN101585018A true CN101585018A (en) | 2009-11-25 |
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| CNA2009101150594A Pending CN101585018A (en) | 2009-03-10 | 2009-03-10 | Centrifuge deceleration method and centrifuge for implementing the method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105709943A (en) * | 2014-12-02 | 2016-06-29 | 来安县新元机电设备设计有限公司 | Shock-resistant centrifugal machine |
| CN108835683A (en) * | 2018-07-17 | 2018-11-20 | 刘仲华 | A kind of Dehydrated Vegetable Processing spin-drying device |
| CN108933372A (en) * | 2018-07-27 | 2018-12-04 | 中国工程物理研究院总体工程研究所 | Geotechnical centrifuge hanging basket power supply unit |
-
2009
- 2009-03-10 CN CNA2009101150594A patent/CN101585018A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105709943A (en) * | 2014-12-02 | 2016-06-29 | 来安县新元机电设备设计有限公司 | Shock-resistant centrifugal machine |
| CN108835683A (en) * | 2018-07-17 | 2018-11-20 | 刘仲华 | A kind of Dehydrated Vegetable Processing spin-drying device |
| CN108933372A (en) * | 2018-07-27 | 2018-12-04 | 中国工程物理研究院总体工程研究所 | Geotechnical centrifuge hanging basket power supply unit |
| CN108933372B (en) * | 2018-07-27 | 2024-01-16 | 中国工程物理研究院总体工程研究所 | Geotechnical centrifuge hanging basket power supply device |
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Open date: 20091125 |