CN201298821Y

CN201298821Y - Slippage controller with an over-speed protection function

Info

Publication number: CN201298821Y
Application number: CNU200820013386XU
Authority: CN
Inventors: 栾福彬; 苗苗
Original assignee: REFRACTORY MATERIAL CO OF ANGANG STEEL GROUP
Current assignee: REFRACTORY MATERIAL CO OF ANGANG STEEL GROUP
Priority date: 2008-06-06
Filing date: 2008-06-06
Publication date: 2009-08-26
Anticipated expiration: 2018-06-06

Abstract

The utility model discloses a slippage controller with an over-speed protection function, which comprises a speed given unit, a speed feedback unit, a comparison unit, an amplification unit, a dephasing trigger unit and a slippage current unit, and also is provided with an over-speed given unit, an over-speed comparison unit, an over-speed detection unit and a protection actuating unit; the over-speed comparison unit compares the feedback signal of the speed feedback unit with the given signal of the over-speed given unit, and after the comparison, the over-speed detection unit detects the comparison result, and the detection result is sent to the protection actuating unit, and the protection actuating unit outputs a signal to control a prime motor. The slippage controller resolves the problems that when a driven axle and a driving axle of a slippage motor are synchronically operated or the driven axle is deviated from the normal work rotation speed range, the alarming cannot be made instantly and the work cannot be automatically stopped. The slippage controller not only saves the human resource, but also prevents the danger caused by the device that works at an abnormal rotation speed, thereby prolonging the service life of the device, and improving the control reasonability of the device and process.

Description

A kind of slippage controller with overspeed protection function

Technical field

The utility model relates to a kind of Motor Control Field, especially a kind of automatic alarm control unit of slip electric motor.

Background technology

Slip electric motor is a kind of permanent torque AC stepless variable-speed motor, mainly is made up of common squirrel-cage asynchronous motor, electromagnetic slip clutch and electrical control gear three parts.Asynchronous motor uses as prime mover, and electromagnetic slip clutch is made up of armature and magnetic pole two parts, armature be cast steel make columnar structured, it is connected with the rotating shaft of squirrel-cage asynchronous motor, is commonly called as active part; Magnetic pole is made the claw type structure, is contained on the bearing axle, is commonly called as secondary part, and electrical control gear is the device that exciting current is provided for slip clutch, regulates the output speed of clutch by the electric current in the SCR control device adjusting clutch excitation winding.Active part and secondary part mechanically do not have any contact, and when prime mover drove the armature rotation of clutch, the armature that the magnetic pole of secondary part is just followed active part rotated together.Series of advantages such as mechanical property hardness height when slip electric motor has the automatic regulating system that speed adjustable range is wide, speed regulation is level and smooth, starting torque is big, power controlling is little, negative velocity feedback is arranged has obtained using widely in each production field.For example: on KM rotary kiln cooler discharge system, adopted slip electric motor to drive the tupelo discharging.

Because armature and magnetic pole gap are very little, be generally about 0.5mm, add reasons such as increase of tupelo drive bearing wearing clearance and cooler bottom dust are big, cause armature and magnetic pole adhesion easily, make driven shaft and the run-in synchronism of prime mover driving shaft, the tupelo blanking velocity is accelerated, the blanking amount increases, and finally causes the generation of accidents such as chain mat machine overload and cooler overflow.For this reason, often need not only waste human resources, also can untimelyly equipment be moved under abnormal condition and damaged because of reporting to the police by manually monitoring.

Summary of the invention

The purpose of this utility model is to provide a kind of slippage controller with overspeed protection function, when the driven shaft of solution slip electric motor departs from the operate as normal range of speeds with driving shaft synchronous operation or driven shaft, can not in time report to the police and automatic out-of-work problem.

The purpose of this utility model is to realize like this; a kind of slippage controller with overspeed protection function; comprise the velocity setting unit; the speed feedback unit; relatively; amplify; phase-shift trigger unit and slippage current unit; the given signal of velocity setting unit and the feedback signal of speed feedback unit are compared by comparing unit; difference relatively is through amplifying; the controllable silicon that phase shift triggers control slippage current unit carries out halfwave rectifier; regulate slip clutch exciting current size; it is characterized in that also being provided with the given unit of hypervelocity; the hypervelocity comparing unit; overspeed detection unit and protection motor unit; the feedback signal of speed feedback unit and the given signal of the given unit of hypervelocity are compared by the hypervelocity comparing unit; relatively the back is detected by the overspeed detection unit; testing result is given the protection motor unit, by the output signal of protection motor unit prime mover is controlled.

The utility model compares by the speed limit value with feedback speed signal and setting, when feedback speed signal exceeds the scope of setting speed limiting value, send alarm signal and control prime mover and stop operating, when the driven shaft that has solved slip electric motor departs from the operate as normal range of speeds with driving shaft synchronous operation or driven shaft, can not in time report to the police and automatic out-of-work problem.Both save human resources, and avoided equipment under abnormal rotational speed, to work and the harm that brings again, prolonged the useful life of equipment, improved the reasonability of apparatus and process control.

Description of drawings

Fig. 1 is the block diagram of the utility model slippage controller;

Fig. 2 is the control principle figure of a kind of embodiment of the utility model;

Fig. 3 is the control principle figure of the another kind of embodiment of the utility model.

Embodiment

The utility model is described in further detail below in conjunction with accompanying drawing.

As shown in Figure 1; a kind of slippage controller of the utility model with overspeed protection function; comprise velocity setting unit 6; speed feedback unit 13; relatively; amplify; phase-shift trigger unit 7 and slippage current unit 8; the given signal of velocity setting unit 6 and the feedback signal of speed feedback unit 13 are passed through relatively; amplify; phase-shift trigger unit 7 compares; difference relatively is through amplifying; the controllable silicon that phase shift triggers control slippage current unit 8 carries out halfwave rectifier; regulate slip clutch 4 exciting current sizes; it is characterized in that also being provided with the given unit 9 of hypervelocity; hypervelocity comparing unit 10; overspeed detection unit 11 and protection motor unit 12; the feedback signal of speed feedback unit 13 and the given signal of the given unit 9 of hypervelocity are compared by hypervelocity comparing unit 10; relatively the back is detected by overspeed detection unit 11; testing result is given protection motor unit 12, by the output signal of protection motor unit 12 prime mover 5 is controlled.When having solved the driving shaft synchronous operation of the driven shaft of slip electric motor bringing onto load 1 and prime mover 5 or driven shaft and departing from the operate as normal range of speeds, can not in time report to the police and automatic out-of-work problem.

As shown in Figure 1, the utility model be utilize tachogenerator 3 the output speed n of clutch 4 change into alternating voltage V～, become direct voltage-Vnf1 through rectifier again.General-Vnf1 sends into comparing unit, compares with given DC excitation voltage+Vgd.Get voltage difference delta V.So the exciting current If of slip clutch is proportional to exciting voltage+Vgd, but be proportional to voltage Δ V.Because V～(-Vnf1) size is relevant with rotation speed n, and n increases, V～(-Vnf1) become greatly.N reduces, V～(-Vnf1) diminish.Therefore, under the constant situation of given DC excitation voltage+Vgd, the size of the exciting current If of slip clutch is relevant with rotation speed n, and promptly along with decline or the rising of n, exciting current If will increase or reduce automatically, because degenerative effect, improved the hardness of electromagnetic clutch mechanical property, the parameter of speed governing at this moment no longer is electric current I f but voltage+Vgd, obviously, given exciting voltage+Vgd is higher, and then rotation speed n is higher; Otherwise then rotating speed is lower.When overspeed tripping device dropped into, setting speed limiting value and speed feedback value compared, when the limit of speed deviations normal range of operation (Vnf〉Vsd), the actuating of relay, the no source contact of its relay is as prime mover being quit work or sending warning; (Vnf＜Vsd), control midget relay coil must not electricity, make prime mover operate as normal or do not send alarm signal when speed during in normal range of operation.

As shown in Figure 1; the utlity model has the slippage controller of overspeed protection function; wherein the speed feedback unit of comparing with the given unit 9 of hypervelocity can adopt two kinds of forms; a kind ofly be made up of the variable resistances that increase in the tachogenerator 3 speed feedback unit 13, another kind is formed by being directly installed on slip clutch 4 output shafts speed measuring device 2.Select by jumper switch S2 during use.Equally, the given unit 9 that exceeds the speed limit also can adopt two kinds of forms, and a kind of variable resistance by increase in the velocity setting unit 6 is formed, and another kind is made up of DC power supply and variable resistance.Select by jumper switch S1 during use.

As shown in Figure 1; the utlity model has the slippage controller of overspeed protection function; its overspeed detection unit 11 judges that by comparing element, detection link, signal amplify and output element is formed, and protection motor unit 12 is made up of signal reception link, SCR control output element.

As shown in Figure 2, the overspeed detection unit is the operational amplifier type.When overspeed detection unit and protection motor unit input (K1 closure); setting speed limiting value and speed feedback value compare; when the limit of speed deviations normal range of operation (Vnf〉Vsd); the negative saturation signal of operational amplifier F1 output; triode T1 ends; capacitor C is charged through R5, R6; when capacitance voltage reaches the peak point voltage of unijunction transistor T2; unijunction transistor T2 conducting; form spike at R9 and make the controllable silicon SCR conducting; the ZJ actuating of relay, the no source contact of its ZJ is as prime mover being quit work or sending warning.As (the Vnf＜Vsd) of speed during in normal range of operation, operational amplifier F1 exports positive saturation signal, triode T1 conducting, capacitor C is discharged through triode T1, unijunction transistor T2 ends, controllable silicon SCR is ended, and control midget relay coil must not be electric, makes prime mover operate as normal or do not send alarm signal.

As shown in Figure 3, the overspeed detection unit is the transistor type.When overspeed detection unit and protection motor unit input (K1 closure); setting speed limiting value and speed feedback value compare; when the limit of speed deviations normal range of operation (Vnf〉Vsd); triode T1 conducting; triode T2 ends; triode T3 ends; capacitor C is charged through R9, R10; when capacitance voltage reaches the peak point voltage of unijunction transistor T4; unijunction transistor T4 conducting; form spike at R13 and make the controllable silicon SCR conducting, the ZJ actuating of relay, the no source contact of its ZJ is as prime mover being quit work or sending warning.As (the Vnf＜Vsd) of speed during in normal range of operation, triode T1 ends, triode T2 conducting, triode T3 conducting, capacitor C is through triode T3 discharge, and unijunction transistor T4 ends, and controllable silicon SCR is ended, control midget relay coil must not be electric, makes prime mover operate as normal or do not send alarm signal.

Claims

1; a kind of slippage controller with overspeed protection function; comprise velocity setting unit (6); speed feedback unit (13); relatively; amplify; phase-shift trigger unit (7) and slippage current unit (8); the given signal of velocity setting unit (6) and the feedback signal of speed feedback unit (13) are compared by comparing unit; difference relatively is through amplifying; the controllable silicon that phase shift triggers control slippage current unit (8) carries out halfwave rectifier; regulate slip clutch (4) exciting current size; it is characterized in that also being provided with hypervelocity given unit (9); hypervelocity comparing unit (10); overspeed detection unit (11) and protection motor unit (12); the feedback signal of speed feedback unit (13) and the given signal of the given unit of hypervelocity (9) are compared by hypervelocity comparing unit (10); relatively the back is detected by overspeed detection unit (11); testing result is given protection motor unit (12), by the output signal of protection motor unit (12) prime mover (5) is controlled.

2, the slippage controller with overspeed protection function according to claim 1 is characterized in that being made up of the variable resistance that increases in tachogenerator (3) the speed feedback unit (13) with the speed feedback unit of comparing, the given unit of hypervelocity (9).

3, the slippage controller with overspeed protection function according to claim 1 is characterized in that being formed by being directly installed on slip clutch (4) output shaft speed measuring device (2) with the speed feedback unit of comparing, the given unit of hypervelocity (9).

4, the slippage controller with overspeed protection function according to claim 1, the given unit (9) that it is characterized in that exceeding the speed limit is made up of the variable resistance that increases in velocity setting unit (6).

5, the slippage controller with overspeed protection function according to claim 1, the given unit (9) that it is characterized in that exceeding the speed limit is made up of DC power supply and variable resistance.

6, the slippage controller with overspeed protection function according to claim 1 is characterized in that overspeed detection unit (11) is made up of comparing element, detection judgement link, signal amplification and output element.

7, the slippage controller with overspeed protection function according to claim 1 is characterized in that protecting motor unit (12) to be made up of signal reception link, SCR control output element.