CN2093828U

CN2093828U - Emergency dispersal device for lifts

Info

Publication number: CN2093828U
Application number: CN 91207651
Authority: CN
Inventors: 刘以凭; 何行炯; 魏桥
Original assignee: Individual
Current assignee: Individual
Priority date: 1991-05-07
Filing date: 1991-05-07
Publication date: 1992-01-22

Abstract

The utility model provides an emergency dispersing device for lifts, which is controlled by a microcomputer. The utility model is characterized in that the utility model is provided with a controller which can randomly generate the optimal SPWM waveform to satisfy the emergency dispersing requirements of a dragging motor when a lift carriage is in the state of different load and different failures, and can simultaneously control the operation of a plurality of lifts, and the controller is composed of a single chip microcomputer, a programmable timer and an SPWM circuit. The emergency dispersing device has the advantages of safe and reliable emergency dispersal, advanced and perfect control function and convenient and simple installation and use, and particularly has good dispersal control function for the top pushing failure of a light-load lift carriage cab and the sinking failure of a heavy-load lift carriage.

Description

Emergency dispersal device for lifts

The utility model relates to the application of electronic technology field, be about a kind of by microcomputerized control be used for elevator faults, emergency evacuation device when having a power failure.

Existing all kinds of elevator emergency device, certain limitation is all arranged, mainly there is following point, (1) less because of the outgoing current of device, so the output torque of hoisting motor is less, only can make heavily loaded bridge railway carriage or compartment descending or underloading bridge railway carriage or compartment is up during fault, thereby sink to the bottom or underloading bridge railway carriage or compartment when rushing to summit, can't realize the emergency evacuation function when heavily loaded bridge railway carriage or compartment; (2) only rely on picking up of rotating speed or electric current and survey to judge whether the bridge railway carriage or compartment is moved, so when above-mentioned fault, mistake may occur and pick up survey; (3) one cover emergency facilitys can only be controlled an elevator; (4) during fault in the railway carriage or compartment passenger can not in time understand fault cause and expeditious measures; (5) whole device is installed complexity, and also inconvenience is used and keeped in repair.The major cause of above-mentioned deficiency is that the control circuit of emergency facility all constitutes with the combinational logic circuit of routine, the reliability of not only working is relatively poor, and main is to be difficult to produce at random best SPWM waveform, the work of hoisting motor during with control different loads and fault.

The purpose of this utility model is that a kind of reliable operation by microcomputerized control will be provided, complete function, safe and practical elevator emergency detrainment device.

This programme employing microcomputer (micro controller system) cooperation programmable interval timer and SPWM circuit are as the controller of device, this controller can be differentiated the work at present state of elevator faults and hoisting motor like clockwork, comprise fault or power cut signal, floor signal, tach signal, And such as current signal send the corresponding work instruction, drive hoisting motor work by the three-phase low-voltage alternating current power supply after the inversion when nonserviceabling with assurance, and the running state of the output torque that makes hoisting motor can be with the size of raise railway carriage or compartment load and fault the time, automatically adjust and the phase sequence conversion, thereby no matter the bridge railway carriage or compartment is rushed to summit or heavy duty when sinking to the bottom in underloading, all can put the visitor by flat bed, safe escape.Owing to adopt system controlled by computer, so, can realize that a table apparatus controls many elevators simultaneously as long as corresponding increase interface is isolated and the group number of commutation circuit.This controller also can pass through input/output circuitry, puts just configured voice producer, so that the passenger can in time understand faulty condition and expeditious measures in the railway carriage or compartment.Of the present utility modelly be characterised in that one can produce best SPWM waveform at random, with satisfy hoisting motor when different loads, the different faults the emergency evacuation needs and can control the controller of many elevator work simultaneously, this controller is made of the little shape computing machine of monolithic, programmable interval timer and SPWM circuit.Wherein, the A wire A of singlechip CPU ₀～A ₇By latch, the work of decoder control programmable interval timer, programming data is by data line D ₀～D ₇Input, input end FCT, the VCT of SPWM circuit, OCT(RCT) be connected with the mouth of programmable interval timer respectively, its mouth ORM1-OBM2 is connected with driving circuit respectively.

The utility model has the advantages that safe and reliable, emergency function is complete, controller performance is preferable, both solved the emergency evacuation that rush to summit in underloading bridge railway carriage or compartment and heavily loaded bridge railway carriage or compartment sinks to the bottom, realized controlling simultaneously the function of many elevators again, and can dispose emergent forecast speech synthesizer easily, its ratio of performance to price is higher.This apparatus structure compactness, easy for installation, easy to maintenance has good practical values.

Below, will be in conjunction with the accompanying drawings, the utility model is further described ， And provides embodiment.

Fig. 1 is a structured flowchart of the present utility model.

Fig. 2 is the controller fundamental diagram,

Fig. 3 is the main loop circuit figure of three-phase inverter.

Interface buffer circuit figure when Fig. 4 is many elevator controls.

With reference to Fig. 1, Fig. 2: the utility model comprises that battery pack 1, miniwatt UPS2, electric current pick up survey time road 3, three-phase inverter 4, driving circuit 5, controller 6, input/output circuitry 7, interface buffer circuit 8, speech synthesizer 9.Described battery pack is used to provide the general supply of device, and UPS provides emergency lighting, controller, speech synthesizer, traction machine brake, door magnet stopper, the working power of door motor.Three-phase inverter is controlled by the controller and by driving circuit driving work, its mouth connects with hoisting motor 10 by the interface buffer circuit, and speech synthesizer is configured in input/output circuitry one end of controller.The controller of this device is made of one chip microcomputer and the programmable interval timer 11, the SPWM circuit 12 that are mated setting, and micro controller system is by CPU, latch 13, decoder 14 control programmable interval timer work.Wherein, the address signal A of CPU ₀～A ₇CS and A by latch and decoder input programmable interval timer ₀, A ₁End, the programming data signal D of CPU ₀～D ₇By read-write WR and WD input programmable interval timer, so that three time meters in this programmable interval timer are programmed accordingly, after this under the fixed frequency pulse input of f end, export the spike train of three required frequencies, make input end FCT, VCT, the OCT(RCT of SPWM circuit) under different frequency pulse input, produce different SPWM waveforms at mouth ORM1, ORM2, OBM1, OBM2, OYM1, OYM2, with the out-put supply of automatically regulating three-phase inverter.If will change the phase sequence of SPWM circuit output wave shape, as long as change the control level that its CW holds by CPU, the height variation along with control level can produce the SPWM waveform of different phase sequences, and then changes the phase sequence of three-phase inverter out-put supply.

With reference to Fig. 3: this device three-phase inverter major loop mainly is made of six power transistors (GTR).Its dc power supply terminal, but be connected to the current transformer of measuring as overcurrent protection and double as regenerated signal 15.

With reference to Fig. 4: when many elevators work of needs control, as long as configuration corresponding interface buffer circuit and commutation circuit.After device startup work, computing machine is at first differentiated the fault elevator with follow procedure, controls evacuation then.As distinguishing that No. 1 elevator has fault, then the pin P1 of computing machine P1 mouth, 0 output low level make relay 1K adhesive, and its contact makes interface buffer circuit I energising work, and then No. 1 elevator is evacuated control.If during many elevator simultaneous faultss, computing machine will be differentiated control in order, finish evacuation one by one.

The principle of work that this device is evacuated control is:

One, hinders for some reason or have a power failure when being stuck in the middle of the floor when the bridge railway carriage or compartment, controller is received actuation signal by interface circuit, promptly producing one group of output frequency by the evacuation procedures imported control SPWM circuit is SPWM waveform about 5HZ, go to promote drive circuit works, after amplifying, this circuit power promotes three-phase inverter work again, three-phase inverter is reverse into three-phase alternating-current supply about 5HZ with 60 volts of following batteries as dc power source, to drive hoisting motor work, can make heavy duty or balance bridge railway carriage or compartment descending, flat bed is put the visitor nearby; As this moment hoisting motor do not have rotating speed, then controller will change the phase sequence by the three-phase alternating-current supply of three-phase inverter output automatically, make hoisting motor do anti-phase rotation, can make the up flat bed nearby in underloading bridge railway carriage or compartment put the visitor.More than two kinds of mode of operations can carry out rapid evacuation, that is conventional the evacuation.

Two, sink to the bottom in underloading bridge railway carriage or compartment or heavily loaded bridge railway carriage or compartment when rushing to summit, it is the same that it evacuates principle.When rapid evacuation, as hoisting motor generation overspeed, then controller enters the regenerative brake state with the automatic guidance hoisting motor and carries out, and makes it be stabilized near the operation synchronous speed.

Three, sink to the bottom in heavily loaded bridge railway carriage or compartment or rush to summit in underloading bridge railway carriage or compartment and the 5HZ three-phase alternating-current supply can't drive hoisting motor when making up or underloading bridge railway carriage or compartment, heavily loaded bridge railway carriage or compartment descending, controller is not detecting under the lasting excessive situation of rotating speed or electric current, with three ac power frequencies that change automatically by inverter output, to regulate the hoisting motor rotating speed, increase the electrical motor output torque, it is up or underloading bridge railway carriage or compartment is descending to drive heavily loaded bridge railway carriage or compartment, finishes evacuation.

The microcomputer of present embodiment adopts MCS～51 type micro controller systems; Driving circuit is a pulse power amplifier circuit; The three-phase inverter major loop is made of power transistor GTR; Programmable interval timer and SPWM circuit are respectively 8253 and 4752 large-scale integration circuiies; Speech synthesizer is made of UM5100 speech synthesis ic and eprom memory; Input/output circuitry is made of photoelectronic coupler and midget relay; Electric current is picked up survey time route Hall current transformer and is constituted; The interface buffer circuit is made of time relay, intermediate relay, contactless switch etc.

Claims

1, a kind of elevator emergency detrainment device.Comprise that battery pack (1), miniwatt UPS (2), electric current pick up survey time road (3), three-phase inverter (4), driving circuit (5), input/output circuitry (7), interface buffer circuit (8) is characterized in that having one can produce best SPWM waveform at random to satisfy the emergency evacuation needs of hoisting motor (10) when elevator cab is in different loads, different faults and can control the controller (6) of many elevator work simultaneously.This controller is made up of one chip microcomputer, programmable interval timer (11) and SPWM circuit (12), wherein, and the A wire A of singlechip CPU ₀～A ₇By latch (13) and decoder (14) control programmable interval timer (11) work, programming data is by data line D ₀～D ₇Input, input end FCT, the VCT of SPWM circuit (12), OCT (RCT) are connected with the mouth of programmable interval timer (11) respectively, and its mouth ORM1～OBM2 is connected with driving circuit (5) respectively.

2, a kind of elevator emergency detrainment device as claimed in claim 1, its feature are provided with the speech synthesizer (9) that is controlled by controller (6) at an end of input/output circuitry (7).