CN106814678A - The safety device of turntable overspeed protection is realized in a kind of utilization dynamic braking - Google Patents
The safety device of turntable overspeed protection is realized in a kind of utilization dynamic braking Download PDFInfo
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- CN106814678A CN106814678A CN201510843466.2A CN201510843466A CN106814678A CN 106814678 A CN106814678 A CN 106814678A CN 201510843466 A CN201510843466 A CN 201510843466A CN 106814678 A CN106814678 A CN 106814678A
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/05—Programmable logic controllers, e.g. simulating logic interconnections of signals according to ladder diagrams or function charts
- G05B19/058—Safety, monitoring
Abstract
The invention discloses the safety device that turntable overspeed protection is realized in a kind of utilization dynamic braking; including control system; the control system includes frequency pressure translation circuit, PLC, autobrake interlock circuit, driver, motor and position sensor; the output end of the driver and the input of autobrake interlock circuit are electrically connected with; the output end of the autobrake interlock circuit and the input of motor are electrically connected with, and the output end of the motor and the input of position sensor are electrically connected with.The present invention realizes that hypervelocity judges using PLC; start the action of dynamic braking interlocking; dynamic braking interlocking mechanism utilizes direct current or alternating current generator principle of reversibility; the energy of moving component itself is converted into heat energy by the generating capacity of motor; kinematic axis is automatically stopped so as to protect turntable and its load; its action is quick, reliable, and braking distance can be obviously reduced, and braking distance can be quantified.
Description
Technical field
The safety device of turntable overspeed protection is realized the present invention relates to numerical control Inertial Navigation Testing Device technical field, more particularly to a kind of utilization dynamic braking.
Background technology
Widely, such as turntable, elevator, robot, its safety in operation are also increasingly taken seriously for the application of motorized motions control system.General motorized motions control system is generally comprised：Controller, driver, motor, mechanical structure, position detecting device, all kinds for completing to need by loop control theory are moved, such as the motion of point-to-point positioning, rate motion, oscillating motion etc..Because the characteristic of closed loop moving control system is influenceed by uncertain factors such as load characteristic, control algolithm and component failures; the safety protecting mechanism of inevitably equipment phenomenon out of control, therefore electric control system is necessary for the normal operation of system and the safety of carrier；
Existing safeguard protection testing mechanism generally comprises the spacing detection of multi-stage electrical and the detection of various fault-signals, all it is by disconnecting closed-loop system, cut off the electricity supply to realize, if rotatable parts inertia is very big, it is very big in high speed rear kinetic energy out of control, under free movement state, running into mechanical stop limiter can produce very big impulsive force, if it is braked often mechanical position limitation destroyed not in time, in turn result in turntable cable and the damage by trial product, and these detections are all premised on whole system reliability service, once system marginal security protection testing mechanism may fail；
Mechanical electromagnetic brake is generally for the safety precautions independently of system.Electromagnetic brake has its obvious limitation, such as wear and tear, and elliptical gear is greatly and complex structure, weight increase etc..On the one hand, the braking effect of electromagnetic brake can be changed over time due to mechanical wear, on the other hand, often relatively difficult to some large-scale compact structure frameworks installation electromagnetic clutch devices, even not possible with.
The content of the invention
The invention aims to solve shortcoming present in prior art, and the safety device of turntable overspeed protection is realized in a kind of utilization dynamic braking for proposing.
To achieve these goals, present invention employs following technical scheme：
The safety device of turntable overspeed protection is realized in a kind of utilization dynamic braking, including control system, the control system includes frequency pressure translation circuit, PLC, autobrake interlock circuit, driver, motor and position sensor, the output end of the driver and the input of autobrake interlock circuit are electrically connected with, the output end of the autobrake interlock circuit and the input of motor are electrically connected with, the output end of the motor and the input of position sensor are electrically connected with, the output end of the position sensor and the input of frequency pressure translation circuit are electrically connected with, the input and PLC of the frequency pressure translation circuit are electrically connected with, the output end of the PLC and the input of autobrake interlock circuit are electrically connected with.
Preferably, the PLC is programmable logic controller (PLC).
Preferably, the motor is electronic and generating double-purpose motor.
Preferably, the output end of the input of the PLC and frequency buckling parallel operation is electrically connected with.
Programmable logic controller (PLC) is utilized in the present invention（PLC）Real time rate signal and speed limit setting signal are received, by exporting digital quantity logical switching signal more afterwards；Motor can be placed in dynamic braking state by autobrake interlock circuit; so as to realize automatic rapid defencive function out of service after runaway speed; quadrature square wave increment type encoded signal of the encoded position signal of digital pulses comprising the output of the position sensors such as rotary encoder, grating, magnetic grid, frequency range is 0-20MHz.Encoded signal is converted to real time rate signal by speed detection module using frequency pressure shift theory, is 0-10V analog signals, using programmable logic controller（PLC）The 0-10V analog signals of receiving velocity signal conversion generation, live adjustable speed limit setting analog signal is received simultaneously, realize reception and the logical process of real time rate signal and speed limit setting signal, with high reliability and flexibility, autobrake interlock circuit makes switching of the motor between motor and generator two states, and exclude the possibility that two states occur simultaneously by mutual exclusion principle, braking distance can be obviously reduced, and braking distance can be quantified, the invention produces braking moment using the principle of reversibility of motor, braking distance can be efficiently controlled there is provided one kind, there is the abnormal condition of hypervelocity in turntable, the safety device of turntable overspeed protection is realized in the utilization dynamic braking in short distance braking immediately kinematic axis, one side protection device physical dimension is small, it is lightweight, it is non-maintaining；On the other hand can also make braking gentle, reduce elliptical gear, so as to avoid mechanical structure because being damaged by big impact or characteristic changes.The present invention is mainly made up of three parts, i.e.,：Speed detection module, exceed the speed limit determination module and dynamic braking module.
Brief description of the drawings
Fig. 1 is the connection block diagram of the safety device that turntable overspeed protection is realized in a kind of utilization dynamic braking proposed by the present invention；
Fig. 2 is the theory diagram of the speed detection module of the safety device that turntable overspeed protection is realized in a kind of utilization dynamic braking proposed by the present invention；
Fig. 3 is the inter-lock circuit schematic diagram of the safety device that turntable overspeed protection is realized in a kind of utilization dynamic braking proposed by the present invention.
Specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is only a part of embodiment of the invention, rather than whole embodiments.Based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art are obtained under the premise of creative work is not made belongs to the scope of protection of the invention.
Reference picture 1-3,The safety device of turntable overspeed protection is realized in a kind of utilization dynamic braking,Including control system,Control system includes frequency pressure translation circuit,PLC,Autobrake interlock circuit,Driver,Motor and position sensor,PLC is programmable logic controller (PLC),And the input of PLC and the output end of frequency buckling parallel operation are electrically connected with,The output voltage of integrated circuit can be stablized,Autobrake interlock circuit makes switching of the motor between motor and generator two states,And exclude the possibility that two states occur simultaneously by mutual exclusion principle,Braking distance can be obviously reduced,And braking distance can be quantified,The output end of driver and the input of autobrake interlock circuit are electrically connected with,The output end of autobrake interlock circuit and the input of motor are electrically connected with,The output end of motor and the input of position sensor are electrically connected with,The output end of position sensor and the input of frequency pressure translation circuit are electrically connected with,The output end and PLC of frequency pressure translation circuit are electrically connected with,The output end of PLC and the input of autobrake interlock circuit are electrically connected with.
The theory diagram of medium-rate detection module of the present invention is as shown in Figure 2.Frequency pressure converter unit 100KHz correspondence 10V outputs, encoded position signal when turntable being run into maximal rate first is normalized to the square-wave signal within 100KHz through frequency regulation block.Normalized square-wave signal pulse produces the spike of negative sense and forward direction after differential circuit differential, is input into frequency pressure converter unit, and charging of the triggering monostable flipflop control constant-current source to measurement electric capacity converts output voltage values.Magnitude of voltage on measurement electric capacity is directly proportional to the frequency of encoded position signal, while the voltage signal represents the size of real time rate.
Hypervelocity determination module major function is to complete the reading of rate signal analog quantity, is compared with speed limit setting rate signal, judges whether present rate exceeds the speed limit, and the part is main to be completed by PLC.Real time rate signal mode analog quantity is exported by speed detection module, and input PLC analog input channels, speed limit setting rate signal analog quantity is adjusted by adjustable potential meter, another analog input channels of input PLC.After calibration is carried out to PLC Analog input mModules, the corresponding PLC internal digitals amount of analog input is specified.PLC program is compared by reading real time rate digital quantity corresponding with setting speed to the two, if real time rate digital quantity is more than setting rate Digital amount, judges real time rate hypervelocity.In order to prevent real time rate signal because interference is undergone mutation or PLC analog inputs port is disturbed and causes to read in rate signal analog quantity mistake, PLC inside is provided with interference protection measure, compare this time to read in and the reading signal after 10 milliseconds, only the two signal differences within the specific limits when, just think that rate signal is believable.Overspeed signal can be fed back to system by hypervelocity determination module by system I/O paths simultaneously, and system makes corresponding treatment.
Dynamic braking module mainly ensures switching of the motor between motor and generator two states using inter-lock circuit as shown in Figure 3, and excludes the possibility that two states occur simultaneously by mutual exclusion principle.Main composition is the incoming transport contactor KMX1 between driver and motor, the incoming transport contactor KMX2 between motor and bleeder resistance, system controls the A.C. contactor open or closed power supplys of KM0 by controlling normally closed switch SB1 and normal open switch SB2, and then by controlling KMX1 and KMX2 to switch closure or disconnecting the working condition of controlled motor.Specific works mode is as described below：
After control system connects general supply L, PLC-Q0.0 is in closure state, SB1 is closed and SB2 disconnects, and KM0 line bag access failure power supplys, KM0 normally opened contacts are off, normally-closed contact is in closure state, KMX1 line bag access failure power supplys, KMX2 line bags switch on power, and open-circuit condition is now between motor and driver, with bleeder resistance in an ON state, now motor is operated in Generator Status to motor；When SB1 closures and SB2 closures, KM0 line bags switch on power, KM0 normally opened contacts are closed and are kept closed, normally-closed contact disconnects, and KMX1 line bags switch on power, KMX2 line bag deenergizations, now motor is connected with driver, motor disconnects with bleeder resistance, and now motor is operated in electric motor state, can run executing agency.After the determination module that exceeds the speed limit confirms system overspeeds, PLC paths disconnect in time, now KM0 lines bag deenergization, and KMX1 line bag deenergizations, KMX2 line bags switch on power, and motor work is rapidly switched to Generator Status.Now each phase current of motor first increases, and reduces afterwards.Increase is that, because speed is higher, the back-emf of generation is higher, and during back-emf acts on armature inductance and armature resistance during short circuit, electric current increases sharply.Then, the plugging torque of generation makes speed decline rapidly, and short circuit current also declines therewith.Motor speed is then the decline of exponential form, until finally stopping completely.Braking distance can be as needed adjusted by adjusting the size of dynamic braking resistance.
The above; preferably specific embodiment only of the invention; but protection scope of the present invention is not limited thereto; any one skilled in the art the invention discloses technical scope in; technology according to the present invention scheme and its inventive concept are subject to equivalent or change, should all be included within the scope of the present invention.
Claims (4)
1. the safety device of turntable overspeed protection is realized in a kind of utilization dynamic braking, including control system, it is characterized in that, the control system includes frequency pressure translation circuit, PLC, autobrake interlock circuit, driver, motor and position sensor, the output end of the driver and the input of autobrake interlock circuit are electrically connected with, the output end of the autobrake interlock circuit and the input of motor are electrically connected with, the output end of the motor and the input of position sensor are electrically connected with, the output end of the position sensor and the input of frequency pressure translation circuit are electrically connected with, the input and PLC of the frequency pressure translation circuit are electrically connected with, the output end of the PLC and the input of autobrake interlock circuit are electrically connected with.
2. the safety device of turntable overspeed protection is realized in utilization dynamic braking according to claim 1, it is characterised in that the PLC is programmable logic controller (PLC).
3. the safety device of turntable overspeed protection is realized in utilization dynamic braking according to claim 1, it is characterised in that the motor is electronic and generating double-purpose motor.
4. the safety device of turntable overspeed protection is realized in utilization dynamic braking according to claim 1, it is characterised in that the input of the PLC and the output end of frequency buckling parallel operation are electrically connected with.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201510843466.2A CN106814678A (en) | 2015-11-27 | 2015-11-27 | The safety device of turntable overspeed protection is realized in a kind of utilization dynamic braking |
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| CN201510843466.2A CN106814678A (en) | 2015-11-27 | 2015-11-27 | The safety device of turntable overspeed protection is realized in a kind of utilization dynamic braking |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111395440A (en) * | 2020-04-13 | 2020-07-10 | 内蒙古霍林河露天煤业股份有限公司 | Pushing limiting system and method for WK-10B electric shovel and electric shovel |
| CN113300637A (en) * | 2021-06-22 | 2021-08-24 | 九江精密测试技术研究所 | Quick braking system for area spacing revolving stage |
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| CN113300637A (en) * | 2021-06-22 | 2021-08-24 | 九江精密测试技术研究所 | Quick braking system for area spacing revolving stage |
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Application publication date: 20170609 |
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