CN102774720A - Elevator overload protection method - Google Patents
Elevator overload protection method Download PDFInfo
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- CN102774720A CN102774720A CN2012102920201A CN201210292020A CN102774720A CN 102774720 A CN102774720 A CN 102774720A CN 2012102920201 A CN2012102920201 A CN 2012102920201A CN 201210292020 A CN201210292020 A CN 201210292020A CN 102774720 A CN102774720 A CN 102774720A
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- overload protection
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Abstract
The invention discloses an elevator overload protection method. When the elevator runs in a full load or overload mode, the electric torque output by the motor is the maximum; and if a weighing sensor is failed, an accident that the elevator descends to the bottom is easily caused. The elevator overload protection method comprises the following steps of: detecting the elevator running direction through a running direction instruction (3) by an elevator main computer (4) after the elevator runs; judging whether the actual running operation of the elevator is upward through a photoelectric encoder if the elevator runs upwards, the elevator is positioned in a normal state if the elevator runs upwards; and if the actual running operation of the elevator is downward, calculating the photoelectric pulse number to obtain the running distance, when the distance exceeds 100mm, transmitting an instruction through the elevator main computer, disconnecting a power supply of an electromagnetic brake through a driving switch (7), so that the electromagnetic brake acts, and the elevator stops in a door area; and opening the elevator door to allow people to leave, and giving out a failure alarm. The elevator overload protection method is used for elevator overload protection.
Description
Technical field:
the present invention relates to elevator Electrical Control Technology field, are specifically related to a kind of elevator overload protection method.
Background technology:
elevator is increasingly extensive as the application in modern society of a kind of vertical transport vehicle.The elevator safety technology is an important problem.During fully loaded or overload operation, the electronic torque of elevator output is maximum at elevator.If the LOAD CELLS of this moment lost efficacy, " at the bottom of the crouching " accident very easily takes place.
CN01807760.9 discloses a kind of " Weight detector of elevator "; CN02142456.X discloses a kind of " being used to interdict the device of lift facility falling protector "; CN01118513.9 discloses a kind of " fender guard of preventing inertial slide for lift with released brake ", and these three patents all are mechanical means.The present invention solves elevator overload operation problem from the electrical control angle.
The overload operation of
elevator occurs in first and four-quadrant, i.e. heavy duty is operation and heavy duty operation downwards upwards.Under the general elevator operation normal circumstances, the accident that elevator can be reported to the police and open the door and can not overloaded and cause when overload.But when in the LOAD CELLS fault or because of maintenance the door machine being weighed overload interlock signal shielding, this moment, the car overload elevator still can the operation of danger close ground, very easily caused fatal accident.
are operated in first quartile when elevator; When overload interlock signal conductively-closed or LOAD CELLS lost efficacy if the door machine is weighed; After overload capacity is big and upwards operation is started; Usually make elevator glide in the opposite direction, after elevator collides energy disperser, stop because electromagnetic torque owes to drive.Car can stop in pit and wait for rescue.Here this type of fault is called " first kind overload fault ".
are operated in four-quadrant when elevator, when overload interlock signal conductively-closed or LOAD CELLS lost efficacy if a door machine is weighed, and elevator overload operation downwards, hoisting motor provides braking torque.The torque direction that hoisting motor provides upwards, and is opposite with sense of motion.This moment, hoisting motor was in generating state.If this moment, overload capacity was bigger, braking current can be greater than the electrical motor rated current, and frequency converter and electrical motor all are in overload, and car speed also can be a little more than command speed, but does not reach the operating value of magnet stopper and safety tongs as yet.This moment, elevator was in extremely dangerous state.When elevator need stop, frequency converter need provide bigger braking current, and hoisting motor need provide bigger braking torque that car is run slowly, and stops up to car.Frequency converter and electrical motor all possibly reach overload limit and protected in this process, and the towing machine power circuit is had a power failure.Cause magnet stopper to move because of dead electricity.Magnet stopper does not move with regard to dead electricity when car speed reduces to very low, can cause car strenuous vibration in being decelerated to zero process rapidly, and such elevator faults tends to cause passenger's casualty accident.Here this type of fault is called " second type of overload fault ".This type of overload fault danger is bigger.
Summary of the invention:
the purpose of this invention is to provide a kind of elevator overload protection method, can judge accurately whether elevator overloads and carry out the elevator overload protection.
Above-mentioned purpose realizes through following technical scheme:
a kind of elevator overload protection method; This method comprises the steps: to pass through the service direction of service direction command detection to elevator by the elevator mainframe computer after the elevator operation; If upwards operation; Then judge through photoelectric encoder whether the real-world operation direction of elevator is upwards, if upwards operation then belongs to normal condition; If actual is downward operation; Then measure the photoimpact number and try to achieve range ability, when distance surpassed 100mm, described elevator mainframe computer sent instruction; Break off the power supply of magnet stopper through driving switch; Make the magnet stopper action, elevator stopping in the door district, is opened the door then and puts the concurrent warning of being out of order of people.
described elevator overload protection method, if instruction is downward operation, then the current sensing means by the frequency converter DC side detects size of current and direction; If the cooresponding electric electromechanics magnetic torque of direction of current upwards, and current value can conclude that " second type of overload fault " taken place elevator when exceeding the protection threshold values of setting; Method of disposal is to send deceleration instruction by described elevator mainframe computer to frequency converter; Described frequency converter slows down hoisting motor, finally makes elevator stop flat bed stop nearby, opens the door and puts the concurrent warning of being out of order of people; If in braking stop process; The frequency converter overheating protection makes the electrical motor dead electricity, and then described elevator mainframe computer sends instruction and makes the magnet stopper action, makes lift car force to stop.
Beneficial effect:
1. the present invention utilize the existing sensor of elevator, instruction repertoire and control law provided by the invention under the prerequisite of not adding any hardware cost, realized the elevator overload protection through software approach.
Whether
through comparing the real-world operation direction of service direction instruction and the detected elevator of photoelectric encoder, can be judged elevator and overload when 2. elevator is operated in first quartile; If elevator is operated in four-quadrant, and current value can conclude that elevator overloads when exceeding the protection threshold values of setting.
The basis that " first kind overload fault " 3. discerned and controlled in
is: (1) photoelectric encoder can not only measuring speed and distance, can also measure the rotation direction of electrical motor; (2) speed of elevator is also very slow in the door district, and the use magnet stopper can be very rapidly with the car stop.
Description of drawings:
accompanying drawing 1 is the structured flowchart of overload protection of the present invention system.
accompanying drawing 2 is software flow patterns of the present invention.
The specific embodiment:
Embodiment 1:
a kind of elevator overload protection method; This method comprises the steps: that elevator operation back is detected the service direction of elevator through service direction instruction 3 by elevator mainframe computer 4; If upwards operation; Then judge through photoelectric encoder 1 whether the real-world operation direction of elevator is upwards, if upwards operation then belongs to normal condition; If actual is downward operation; Then measure the photoimpact number and try to achieve range ability, when distance surpassed 100mm, described elevator mainframe computer sent instruction; Break off the power supply of magnet stopper through driving switch 7; Make the magnet stopper action, elevator stopping in the door district, is opened the door then and puts the concurrent warning of being out of order of people.
Embodiment 2:
The elevator overload protection method that
are above-mentioned, if instruction is downward operation, then the current sensing means 2 by the frequency converter DC side detects size of current and direction; If the cooresponding electric electromechanics magnetic torque of direction of current upwards, and current value can conclude that " second type of overload fault " taken place elevator when exceeding the protection threshold values of setting; Method of disposal is to send deceleration instruction by described elevator mainframe computer to frequency converter 5; Described frequency converter slows down hoisting motor, finally makes elevator stop flat bed stop nearby, opens the door and puts the concurrent warning of being out of order of people; If in braking stop process; The frequency converter overheating protection makes the electrical motor dead electricity, and then described elevator mainframe computer sends instruction and makes the magnet stopper action, makes lift car force to stop.
Embodiment 3:
The elevator overload protection method that
are above-mentioned; Use therein overload protection system; Its composition comprises: the elevator mainframe computer; The information that photoelectric encoder, current sensing means, control operating instruction are gathered respectively separately passes to described elevator mainframe computer, and described computing machine passes to master cock and frequency converter with control command, and described master cock passes to magnet stopper with order; Described frequency converter passes to described current sensing means with information, and described frequency converter is connected with electrical motor 6.
Embodiment 4:
Judge elevator through comparison order direction and real-world operation direction when elevator is operated in first quartile and whether overload,, also can judge elevator and overload if elevator is operated in four-quadrant and current value when exceeding the protection threshold values of setting;
When being operated in first quartile, elevator, judges whether elevator overloads through comparing the real-world operation direction of service direction instruction and the detected elevator of photoelectric encoder;
Through detected size of current of the current sensing means of frequency converter DC side and direction, in conjunction with current service direction instruction, judge whether elevator is operated in four-quadrant, when current value exceeds the protection threshold values of setting, can conclude that overload has taken place elevator;
Make elevator stop when overloading through magnet stopper;
frequency converter stops the deceleration of elevator flat bed through frequency converter during overheating protection, when frequency converter is overheated, makes elevator stop when the overload through magnet stopper.
Embodiment 5:
combination photoelectric encoder, service direction instruct and judge whether to take place " first kind overload fault ".Concrete deterministic process is, after the elevator mainframe computer obtains the upwards operation information from the service direction instruction, through the real-world operation direction of photoelectric encoder detection elevator, with upwards operation information contrast.If the real-world operation direction of elevator is downward operation; Then in certain distance, send instruction,, make the magnet stopper action through the power supply of driving switch disconnection magnet stopper by mainframe computer; Elevator stopping in the door district, is opened the door then and puts the concurrent warning of being out of order of people.The basis one of identification and control " first kind overload fault " is that photoelectric encoder can not only measuring speed and distance, can also measure the rotation direction of electrical motor; The 2nd, the speed of elevator is also very slow in the door district, and the use magnet stopper can be very rapidly with the car stop.Photoelectric encoder and service direction instruction all are the unit that general elevator has all had, and do not need to add in addition hardware cost.
Claims (2)
1. elevator overload protection method; It is characterized in that: this method comprises the steps: to pass through the service direction of service direction command detection to elevator by the elevator mainframe computer after the elevator operation; If upwards operation; Then judge through photoelectric encoder whether the real-world operation direction of elevator is upwards, if upwards operation then belongs to normal condition; If actual is downward operation; Then measure the photoimpact number and try to achieve range ability, when distance surpassed 100mm, described elevator mainframe computer sent instruction; Break off the power supply of magnet stopper through driving switch; Make the magnet stopper action, elevator stopping in the door district, is opened the door then and puts the concurrent warning of being out of order of people.
2. elevator overload protection method according to claim 1 is characterized in that: if instruction is downward operation, then the current sensing means by the frequency converter DC side detects size of current and direction; If the cooresponding electric electromechanics magnetic torque of direction of current upwards, and current value can conclude that " second type of overload fault " taken place elevator when exceeding the protection threshold values of setting; Method of disposal is to send deceleration instruction by described elevator mainframe computer to frequency converter; Described frequency converter slows down hoisting motor, finally makes elevator stop flat bed stop nearby, opens the door and puts the concurrent warning of being out of order of people; If in braking stop process; The frequency converter overheating protection makes the electrical motor dead electricity, and then described elevator mainframe computer sends instruction and makes the magnet stopper action, makes lift car force to stop.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210292020.1A CN102774720B (en) | 2012-08-16 | 2012-08-16 | Elevator overload protection method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210292020.1A CN102774720B (en) | 2012-08-16 | 2012-08-16 | Elevator overload protection method |
Publications (2)
| Publication Number | Publication Date |
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| CN102774720A true CN102774720A (en) | 2012-11-14 |
| CN102774720B CN102774720B (en) | 2016-09-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210292020.1A Expired - Fee Related CN102774720B (en) | 2012-08-16 | 2012-08-16 | Elevator overload protection method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103213896A (en) * | 2013-04-17 | 2013-07-24 | 无锡市崇安区科技创业服务中心 | Intelligent escalator |
| CN105683079A (en) * | 2013-11-01 | 2016-06-15 | 通力股份公司 | Elevator and method for the use of an elevator control system in monitoring the load of a car and/or to determine the load situation |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02249884A (en) * | 1989-03-22 | 1990-10-05 | Mitsubishi Electric Corp | Elevator controller |
| US5039028A (en) * | 1986-09-26 | 1991-08-13 | Akerstroms Bjorbo Ab | Overload protection |
| JPH09284992A (en) * | 1996-04-12 | 1997-10-31 | Shintachikawa Kokuki Kk | Overload protector fro lifter |
| JP2006321642A (en) * | 2005-05-20 | 2006-11-30 | Hitachi Building Systems Co Ltd | Car inside load detecting device of elevator |
| CN101085662A (en) * | 2007-06-21 | 2007-12-12 | 江苏三上机电制造股份有限公司 | Construction lifter excess load controller |
| JP2010143692A (en) * | 2008-12-17 | 2010-07-01 | Mitsubishi Electric Corp | Elevator device |
-
2012
- 2012-08-16 CN CN201210292020.1A patent/CN102774720B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5039028A (en) * | 1986-09-26 | 1991-08-13 | Akerstroms Bjorbo Ab | Overload protection |
| JPH02249884A (en) * | 1989-03-22 | 1990-10-05 | Mitsubishi Electric Corp | Elevator controller |
| JPH09284992A (en) * | 1996-04-12 | 1997-10-31 | Shintachikawa Kokuki Kk | Overload protector fro lifter |
| JP2006321642A (en) * | 2005-05-20 | 2006-11-30 | Hitachi Building Systems Co Ltd | Car inside load detecting device of elevator |
| CN101085662A (en) * | 2007-06-21 | 2007-12-12 | 江苏三上机电制造股份有限公司 | Construction lifter excess load controller |
| JP2010143692A (en) * | 2008-12-17 | 2010-07-01 | Mitsubishi Electric Corp | Elevator device |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103213896A (en) * | 2013-04-17 | 2013-07-24 | 无锡市崇安区科技创业服务中心 | Intelligent escalator |
| CN105683079A (en) * | 2013-11-01 | 2016-06-15 | 通力股份公司 | Elevator and method for the use of an elevator control system in monitoring the load of a car and/or to determine the load situation |
| CN105683079B (en) * | 2013-11-01 | 2018-01-12 | 通力股份公司 | For the elevator and method using apparatus for controlling elevator monitoring car load and/or determination loading condition |
| US10179718B2 (en) | 2013-11-01 | 2019-01-15 | Kone Corporation | Elevator car overload monitoring to prevent starting |
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| Publication number | Publication date |
|---|---|
| CN102774720B (en) | 2016-09-14 |
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