Summary of the invention
The invention provides a kind of intellectual tensile force alarm device; existing tensile force alarm device can be solved and the warning value of thrust can not be automatically regulated; when the hanging basket negative-phase sequence is moved and lose protective effect when the hanging basket control contactor sticks together fault, can produce the problem of actuation of an alarm during exact connect ion at cable.
For solving the problems of the technologies described above, the present invention is achieved by the following technical solutions:
A kind of intellectual tensile force alarm device, comprise sensor, amplifying circuit, micro controller system and performance element, it is characterized in that also comprising controlling instruction detection unit,
The described instruction detection unit of controlling detects the control instruction of operative employee to hanging basket, and produces corresponding electric signal and be input to described micro controller system,
The VREF (Voltage Reference) calculation procedure that described micro controller system prestores corresponding with described electric signal, compare the VREF (Voltage Reference) calculated with the output voltage of described amplifying circuit, judgement, then export corresponding control signal to described performance element.
The described instruction detection unit of controlling comprises the optocoupler part, and the electric signal that its produces is input to described micro controller system after by described optocoupler partial coupling.
The described instruction detection unit of controlling obtains ac signal according to the alternating-current voltage/AC voltage variation at connected hanging basket control button or hanging basket control contactor two ends.
The described instruction detection unit of controlling comprises the rectification module part, and described rectification module is partly for controlling the ac signal that instruction detection unit obtains and change DC signal into described.
The described instruction detection unit of controlling comprises up command detection part and the descending command detection part of controlling controlled,
The described up command detection part controlled is controlled instruction for detection of the operative employee to hanging basket up, and it detects that the operative employee presses or while unclamping hanging basket upload control button, produces corresponding upward signal and be input to described micro controller system,
The described descending command detection part controlled is controlled instruction for detection of the operative employee to hanging basket descending, and it detects that the operative employee presses or while unclamping the descending control button of hanging basket, produces corresponding downgoing signal and be input to described micro controller system.
As further optimization, described intellectual tensile force alarm device also is provided with the sensing rope, and described sensing rope upper end connects described sensor, and described sensing rope outside is provided with sheath.
As further optimization, described intellectual tensile force alarm device also is provided with metal case, and described sensor is fixed in described metal case, and described sheath upper end is fixed on described metal case, described sensing rope passes described sheath, described sensing rope lower end connecting cable geometrical clamp.
As further optimization, described amplifying circuit, described micro controller system, described performance element and the described instruction detection unit of controlling all are fixed in described metal case.
Intellectual tensile force alarm device basic setup
The same with digital pulling force alarm device, intellectual tensile force alarm device also comprises sensor, amplifying circuit, performance element and micro controller system.Sensor produces electric signal according to the tension variations of cable end, amplifying circuit is input to micro controller system after the electric signal of sensor mouth is amplified, the built-in analog to digital conversion circuit of micro controller system is digital signal by the analog-signal transitions of amplifying circuit input, micro controller system can calculate the output voltage of amplifying circuit at any time, and calculates the value of the pulling force that sensor is subject to.Performance element comprises warning circuit and relay, and warning circuit is provided with buzzer phone and LED light.
What have more advantage is that intellectual tensile force alarm device comprises and controls instruction detection unit, controls instruction detection unit more information can be provided.The operative employee presses or while unclamping the control button of hanging basket, controlling instruction detection unit can produce immediately corresponding electric signal (hereinafter to be referred as controlling signal) and be input to micro controller system, what the information that micro controller system can obtain comprised that the operative employee presses is upload control button or descending control button, press the moment of this button, press lasting long of this button, unclamp the moment of this button.According to the information of these information and amplifying circuit input, micro controller system can be made multiple judgement, and circuit in hanging basket is carried out to intelligent control.
In order to make tensile force alarm device have more practicality, intellectual tensile force alarm device also is provided with metal case, sensing rope and sheath, and it is convenient that these settings install it.Intellectual tensile force alarm device can be fixed on hanging basket working platform, also can be arranged on hanging basket switch box inside.When the inner installation of hanging basket switch box, only the sensing rope need be passed and gets final product from hanging basket switch box below.Sensing rope and length are greater than the summation of the height and the width of hanging basket working platform.The geometrical clamp of sensing rope lower end connecting cable end.
Intellectual tensile force alarm device obtains the mode of cable end pulling force information when hanging basket is descending
While in the hanging basket switch box or on hanging basket working platform, intellectual tensile force alarm device being installed, all should guarantee that it is placed in the hanging basket working platform outside (side on building masonry wall opposite).
In the descending process of hanging basket, after being tangled by obstacle, cable can move sensing rope lower end to the hanging basket working platform inboard.If it is descending that hanging basket continues, the sensing rope can be crushed on the hanging basket working platform below.In the hanging basket working platform inboard, cable end can impose on the pulling force that the sensing rope makes progress, and the sheath of sensing rope outside can change the direction of this pulling force, so, in the hanging basket working platform outside, the pulling force that sensor is subject to remains downward.
Intellectual tensile force alarm device is adjusted the concrete mode of warning value of thrust automatically:
Hanging basket is in up process, and the quality of cable movement part is ever-increasing, so the suffered pulling force of cable end constantly increases.When not being subject to extraneous resistance, the suffered pulling force of cable end can calculate.The geometrical clamp of cable end connects sensing rope lower end, so the pulling force that sensor is subject to equals the suffered pulling force of cable end.
Lower surface analysis once, when in the up process of hanging basket, cable is not subject to extraneous resistance, the situation of change of the pulling force that sensor is subject to:
When hanging basket power supply phase sequence is normal, in the moment of from the operative employee, pressing hanging basket upload control button, hanging basket is in accelerating uplink state, and establishing the now quality of cable movement part is M
0, sensor under tension F now
0With M
0Pass be,
F
0=M
0(g+a), i.e. M
0=F
0/ (g+a),
Along with the hanging basket acceleration is up, the quality of cable movement part constantly increases thereupon, and the length that cable movement partly increases equals the up distance of hanging basket
If it is a that hanging basket accelerates up acceleration/accel, accelerate up distance for S
1, accelerating the up time is t
1, the quality of every meter cable is m, acceleration due to gravity is g.
S
1=at
1 2/ 2, the mass M that cable movement partly increases
Z1For, M
Z1=mat
1 2/ 2
T
1In time period, hanging basket is in accelerating uplink state, so the tensile force f that sensor is subject to
1Should be expressed as
F
1=(M
0+M
Z1)×(g+a)
=[F
0/(g+a)+mat
1 2/2]×(g+a)
=F
0+ma(g+a)t
1 2/2
After of short duration accelerator, hanging basket enters the uniform ascending state, and the speed of establishing the hanging basket uniform ascending is V, and the distance of uniform ascending is S
2, the time of uniform ascending is t
2,
S
2=Vt
2, the mass M that cable movement partly increases
Z2For, M
Z2=mVt
2,
T
2In time period, hanging basket is in the uniform ascending state, and the pulling force on sensor equals the suffered gravity of cable movement part, F
2Should be expressed as
F
2=(M
0+M
Z1+M
Z2)g
=F
0g/(g+a)+mgat
1 2/2+mgVt
2
At F
1And F
2Expression formula in, gravity acceleration g, the quality m of every meter cable, be constant.Because hanging basket is a kind of machinery of low cruise, how much load-carrying can be ignored for acceleration/accel a and speed uplink V impact, so during the suffered pulling force of calculating sensor, a and V can regard constant as.The operative employee presses the moment of hanging basket upload control button, and upward signal is input to micro controller system immediately, and micro controller system can calculate F
0, the time length of upward signal is the up time of hanging basket, so micro controller system can calculate F at any time
1And F
2Value.
In the up process of hanging basket, if the maximum resistance that allows cable to be subject to is f, at t
1In time period, micro controller system is made as F by the warning value of thrust
1+ f, at t
2In time period, micro controller system is made as F by the warning value of thrust
2+ f gets final product.
In the descending process of hanging basket, cable, in naturally drooping state, does not have the pulling force increase that friction force causes sensing to be subject to.When cable is tangled by obstacle, the quality of cable movement part can reduce rapidly, then reduces to gradually zero along with the hanging basket continuous decrease, if then hanging basket continues to descend, the pulling force that cable end is applied on sensor just can increase.Therefore can find out, even a very little value of the pulling force that now sensor is subject to just can be judged cable and be stopped by obstacle.So, in the descending process of hanging basket, when micro controller system detects pulling force that sensor is subject to and enlarging state occurs, as long as set a less warning value of thrust F
X, just can effectively protect cable.
The phase sequence of powering due to hanging basket may change, so micro controller system can't be according to controlling signal judgement hanging basket in uplink state or downstream state, the variation tendency of the pulling force that can only be subject to according to sensor judges.
In the moment of controlling signal input micro controller system, at first micro controller system need to be defaulted as the hanging basket running state up, according to F
1+ f calculating formula is set the warning value of thrust, constantly reducing and be reduced to gradually after zero when micro controller system detects the pulling force that sensor is subject to, then to proofread and correct the warning value of thrust is F
XGet final product.
As can be seen from the above analysis, the ratio of the pulling force be subject to according to sensor and the output voltage of amplifying circuit, micro controller system is by F
1+ f and F
2+ f and F
XBe converted into corresponding VREF (Voltage Reference) U
1, with the output voltage of amplifying circuit, compare at any time, just can reach the purpose of automatic calibration warning value of thrust.
The mode of intellectual tensile force alarm device when cable is tangled
After the operative employee presses the hanging basket control button, micro controller system calculates VREF (Voltage Reference) U at any time according to controlling signal
1, the output voltage that amplifying circuit detected surpasses U
1The time, can judge cable and be tangled by obstacle, micro controller system will be immediately input control signal to performance element, thereby the control relay action disconnects hanging basket urgency power failure road, and the buzzer phone in the control warning circuit sends interrupted chimes of doom, control LED light and constantly glimmer; The U the calculated when output voltage that micro controller system detects amplifying circuit continues lower than the actuating of relay
1Value, control warning circuit and quit work, micro controller system assert that the time period of warning circuit work is an alarm cycle.
In the moment of the actuating of relay, the operative employee can not leave finger the hanging basket control button at once, so micro controller system can be judged the operative employee and supresses which control button according to controlling signal.
If micro controller system detects upward signal when an alarm cycle starts,, in this alarm cycle, micro controller system just can make relay reset while upward signal disconnection or downgoing signal input being detected; If micro controller system detects downgoing signal when an alarm cycle starts,, in this alarm cycle, micro controller system just can make relay reset while downgoing signal disconnection or upward signal input being detected.
The mode of operation of intellectual tensile force alarm device when the operation of hanging basket negative-phase sequence tangles cable
In the situation that hanging basket power supply phase sequence mistake, after the operative employee presses the descending control button of hanging basket, the descending control contactor action of hanging basket, but hanging basket can be in uplink state.If now cable is tangled by obstacle, micro controller system moves control relay, disconnects the anxious power failure of hanging basket road, and controls warning circuit work, and three plase alternating current can not arrive the descending control contactor of hanging basket, and hanging basket stops rising.Mode according to intellectual tensile force alarm device when cable is tangled, in this alarm cycle, micro controller system could reset by control relay while downgoing signal disconnection or upward signal input being detected, so the operative employee must press hanging basket upload control button, could be controlled hanging basket.After the operative employee presses hanging basket upload control button, the action of hanging basket upload control contactless switch, hanging basket will be in downstream state.The operative employee is by after the removal of obstacle of below, and the pulling force that sensor is subject to reduces greatly, the VREF (Voltage Reference) U the calculated when output voltage of amplifying circuit must continue lower than the actuating of relay
1Value, micro controller system will be controlled warning circuit and quit work, and finish this alarm cycle.
In like manner, when the operative employee presses hanging basket upload control button, hanging basket can be in downstream state.If enter alarm cycle, micro controller system detects that upward signal disconnects or during the downgoing signal input, just can make relay reset, so the operative employee only pins the descending control button of hanging basket, and controlling that hanging basket is up could clearing of obstruction.
The mode of intellectual tensile force alarm device when adhesion fault appears in the hanging basket control contactor
The workplatform of hanging basket is to rely on steel wire hang skyborne, the operative employee controls the moment of stopping after the hanging basket upstream or downstream, after workplatform runs out of steam, under the elastic force effect of self gravitation and steel rope, through vibration could be steady gradually for several times, the pulling force that sensor is subject to can be stable gradually after acute variation, and the output voltage of amplifying circuit also can be stable gradually after acute variation, and variation is suddenly big or suddenly small.
When adhesion fault appears in the hanging basket control contactor, after the operative employee unclamps hanging basket upload control button or descending control button, hanging basket can still continue up or descending according to original running state, the output voltage of amplifying circuit will inevitably continue increase or reduce according to original trend, rather than the process of acute variation occurs immediately.
Micro controller system can be judged hanging basket in uplink state or downstream state according to the output voltage variation tendency of amplifying circuit.If micro controller system is judged hanging basket when uplink state stops, assert that the output voltage values of the amplifying circuit of controlling signal disconnection moment record is VREF (Voltage Reference) U
2If micro controller system detects amplifying circuit after controlling signal disconnection output voltage in two seconds continues higher than U
2, can judge the hanging basket control contactor and adhesion fault occur; If micro controller system is judged hanging basket when downstream state is stopped, assert that the output voltage values of the amplifying circuit of controlling signal disconnection moment record is VREF (Voltage Reference) U
2If the output voltage that micro controller system detects amplifying circuit within two seconds of controlling after signal disconnects continues lower than U
2, can judge equally the hanging basket control contactor and adhesion fault occur.
The contactless switch fault that sticks together is not accidental, once adhesion phenomenon occur, the existing problems of its inside is described, continues use and adhesion phenomenon can often occur, has very big potential safety hazard, easily produces dangerous.So micro controller system detects the hanging basket control contactor while sticking together fault, by the Sustainable Control actuating of relay, and the buzzer phone of controlling in warning circuit sends continuous chimes of doom, controls LED light and continues luminous.After only having maintainer's replacing by the time or maintenance contactless switch, connect by three control buttons, give monolithic processor resetting information, micro controller system could be removed alarm condition.
As seen through the above analysis, when adhesion fault appears in the hanging basket control contactor, intellectual tensile force alarm device forces hanging basket out of service by disconnecting the anxious power failure of hanging basket road.This mode has more advantage than disconnecting the hanging basket upstream circuitry, not only can prevent that cable is pulled off, and can eliminate potential potential safety hazard.
Intellectual tensile force alarm device judgement cable does not have the mode of exact connect ion
Hanging basket is when the floor operation, and after the operative employee presses hanging basket upload control button or descending control button, the pulling force that sensor is subject to will inevitably continue increase or reduce.Only have hanging basket when installation or dismounting, the operative employee need to penetrate or exit steel rope to hanging basket hoisting, and the pulling force that now sensor is subject to is sustained, but this process duration is no more than half an hour at most.
Therefore, if micro controller system after the time cumulation of controlling signal input surpasses half an hour, detects the pulling force that sensor is subject to, do not change, can conclude that the operative employee is not by the intellectual tensile force alarm device of cable exact connect ion.
When micro controller system is set after start and controlled signal and input for the first time, the output voltage values of the amplifying circuit of record is VREF (Voltage Reference) U
3, in the given time, output voltage and the U of amplifying circuit detected
3Difference continue not change, micro controller system moves control relay, forces hanging basket out of service, and the buzzer phone of controlling in warning circuit sends continuous alarm sound, LED light is constantly glimmered, the prompting operation work is by the cable exact connect ion.Micro controller system detects output voltage and the U of amplifying circuit
3Difference while changing, remove alarm condition.
Compared with prior art, advantage of the present invention and good effect are:
1, intellectual tensile force alarm device can be warned value of thrust by automatic calibration, can protect better cable not drawn bad.
No matter 2 in the up process of hanging basket or in descending process, if cable is tangled by obstacle, intellectual tensile force alarm device can produce actuation of an alarm, prevents that cable from being hung bad.
3, when hanging basket power supply phase sequence mistake, intellectual tensile force alarm device still can play a protective role, and effectively prevents that cable from being drawn bad, and operation is very easy.
4, when contactless switch sticks together fault, intellectual tensile force alarm device can judge, and sends actuation of an alarm, eliminates potential potential safety hazard and guarantees that cable can not be pulled off.
5, the operative employee, forget or during deliberately by the cable exact connect ion, intellectual tensile force alarm device can produce actuation of an alarm, thereby guarantees that this device can effectively be used, and avoids bringing unnecessary loss to the hanging basket owners.
6, intellectual tensile force alarm device can send different alarms according to different faults, and convenient operation work and maintainer investigate fault in time.