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Elevator safety protection method

A safety protection and elevator technology, applied in the field of elevator control, can solve the problems of slow response speed of contactors, easily damaged contacts, and increased costs, and achieve the effects of inhibiting accidental movement, reducing slippage speed, and increasing costs.

Active Publication Date: 2016-04-06
SHANGHAI MITSUBISHI ELEVATOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] However, in addition to the increased cost of the contactor and the slow response speed of the contactor, this method also has the defect that the contact of the auxiliary contactor is easily damaged by the instantaneous large current generated when the three-phase coil of the motor is short-circuited. Not suitable for braking after the elevator has slipped

Method used

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Examples

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Effect test

Embodiment 1

[0032] This example is suitable for application image 3 Inverter lift shown. This inverter structure is a general-purpose frequency converter structure commonly used now. The AC power of the power supply is converted into DC power through a rectifier. An alternating current with adjustable frequency and amplitude is used to drive the motor.

[0033] After the car slippage is detected, the elevator control system sends an instruction to short-circuit the three-phase coil of the motor to the inverter. After receiving the instruction, the inverter outputs an on or off signal to the switching element to close the switching element on either the positive polarity side or the negative polarity side of the inverter and turn off the switching element on the other polarity side.

[0034] Such as image 3As shown, in this embodiment, the three switching elements located on the upper bridge arm of the inverter are turned off, and the three switching elements located on the lower brid...

Embodiment 2

[0045] This embodiment is suitable for elevators using matrix frequency converters.

[0046] Such as Figure 4 As shown, the matrix frequency conversion circuit is connected by nine controllable bidirectional switches. After the car slippage is detected, the elevator control system sends an instruction to short-circuit the three-phase coil of the motor to the inverter. After the inverter receives the instruction, it outputs voltage signals to the nine bidirectional switching elements of the matrix frequency conversion circuit, closes the three bidirectional switching elements directly connected to the power input phase a (or b phase, or c phase) and turns off the power supply. The other two inputs are connected to six bidirectional switching elements.

[0047] At this time, the three closed bidirectional switching elements in the matrix frequency conversion circuit and the three-phase coil of the motor form a closed loop, and the car slips to drag the motor to rotate to ente...

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Abstract

The invention discloses an elevator safety protection method. When an elevator stops in a door area, the elevator monitors the sliding condition of an elevator car in real time. If the situation that the car slides due to the insufficient braking torque of a band-type brake is judged, electricity generation braking is carried out through a three-phase coil of an inverter short-circuit motor, the sliding speed of the car is lowered, and meanwhile a door is forced to be closed. After the elevator door is closed, the elevator is started again and moves towards the terminal layer of the sliding direction of the car, a door closing state is kept after the elevator stops, fault prompting is sent out, and a person waits for rescue. The elevator safety protection method can effectively achieve protection in the elevator sliding process, and the danger of the sliding of the car is reduced without adding a system hardware device.

Description

technical field [0001] The invention relates to the field of elevator control, in particular to an elevator safety protection method with a car slip detection function. Background technique [0002] Such as figure 1 As shown, in the elevator, one end of the wire rope 11 is connected with the car 6, and the other end is connected with the counterweight 7, and the car 6 and the counterweight 7 are hung on the rope winding wheel 5 driven by the motor 4 through the wire rope 11. [0003] When the elevator is running, the brake blocks 8 and 9 are opened, the three-phase alternating current is rectified into direct current by the rectifier 1, and the rectified direct current is filtered by the rectifying capacitor 2 and then output to the inverter 3. Inverter 3 is connected by bridge circuit with six groups of diodes and switching elements, and the variable frequency drive unit in the elevator controller sends out voltage commands to turn on or off each switching element, so that...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B66B5/02
Inventor 刘玉兵贺东方
Owner SHANGHAI MITSUBISHI ELEVATOR CO LTD
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