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Slow descending device of lifting machine

A lift and slow-down technology, which is applied in lifts, transportation and packaging, etc., can solve the problems of unstable descending speed, slow descending speed, and car load requirements, etc., so as to solve the problems of long rescue time and safe and stable rescue process Effect

Inactive Publication Date: 2014-06-18
JIANGSU SANSI WIND POWER TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a kind of elevator slow-down device in order to overcome the slow-down speed and unstable down-speed in the slow-down operation of the elevator in the prior art, and to have requirements on the car load of the elevator. In the process of descending, by detecting and controlling the alternating current in a motor, the uniform motion of the motor can be realized

Method used

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  • Slow descending device of lifting machine
  • Slow descending device of lifting machine
  • Slow descending device of lifting machine

Examples

Experimental program
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Effect test

no. 1 example

[0025] Such as figure 1 The structure diagram of the elevator slow-down device of the present invention is shown, which includes a motor 1 , a rectifier unit 2 , a voltage detection unit 3 and a discharge unit 4 .

[0026] Wherein the motor 1 generates alternating current through the movement of the elevator, that is, when the elevator descends, the motor 1 is driven to rotate, so that the motor 1 generates alternating current.

[0027] The rectification unit 2 is used to convert the alternating current generated by the motor 1 into direct current, and the sorting unit may adopt full-bridge rectification or half-bridge rectification to realize the conversion from alternating current to direct current.

[0028] The voltage detecting unit 3 is used for detecting the voltage of the direct current converted by the rectifying unit 2 . Wherein the voltage detection unit 3 is also preset with a threshold voltage, and when the voltage of the direct current is greater than the thresho...

no. 2 example

[0040] Such as figure 2 As shown, the difference between this embodiment and the first embodiment is that the lift slow down device in this embodiment further includes a switch unit 5, and the switch unit 5 is used to turn on or off the motor 1 and the The connection path between the rectification units 2. When the elevator is in failures such as power outages, the elevator slow-down device in this embodiment can be opened manually. Thereby giving the user a larger operating space and preventing the system failure from causing the elevator lifting device to not work.

[0041] In addition, the voltage detection unit 3 in this embodiment includes a voltage sampling module 31 and a voltage comparison module 32 . The discharge unit 4 includes a discharge module 41 and a drive protection module 42 . The voltage sampling module 31 samples the voltage of the direct current output by the rectifying unit 2 , and the voltage comparison module 32 is preset with a threshold voltage fo...

no. 3 example

[0043] Such as image 3 The circuit structure diagram of the elevator slow down device of the present invention is shown, which includes a permanent magnet synchronous motor 1 , a switch 5 , a rectifier bridge 2 , a voltage detection unit 3 and a discharge unit 4 .

[0044] In this embodiment, the permanent magnet synchronous motor 1 is used as an electric motor, and generates alternating current through the movement with the elevator.

[0045] In this embodiment, the rectifier bridge 2 converts the alternating current generated by the permanent magnet synchronous motor 1 into direct current in the form of full bridge rectification. In addition, conversion methods such as half-bridge rectification can also be used as needed. The rectifier bridge 2 has a positive output terminal 21 and a negative output terminal 22, and outputs positive direct current and negative direct current respectively.

[0046] In this embodiment, a switch 5 is used as a switch unit for opening or clos...

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Abstract

The invention discloses a slow descending device of a lifting machine, which comprises an electric motor for generating alternating current through the motion of the lifting machine, a rectifier unit for transforming the alternating current generated by the electric motor to direct current, a voltage detecting unit for detecting the voltage of the direct current and a discharging unit for discharging the direct current, wherein a threshold voltage is further preset in the voltage detecting unit, when the voltage of the direct current is larger than a threshold unit, the discharging unit is used for discharging the direct current. The slow descending device of the lifting machine can realize the constant-speed motion of the electric motor by detecting and controlling the alternating current in the electric motor; therefore, when fault shutdown occurs in the lifting machine, the constant-speed descending can be achieved regardless of the weight of a load of a car, the safety and the smoothness in the rescue process can be further realized, and the problems that the rescue time is too long, the car has potential safety hazard when carrying the heavy load, the service life of a contracting brake is shortened due to the use of the contracting brake and the like in the traditional method can be solved.

Description

technical field [0001] The invention relates to a slow-down device for an elevator, in particular to a device for slow-downing an elevator at a constant speed. Background technique [0002] In the existing elevators, especially the elevators of wind towers, when a power failure or other failure occurs during the operation of the elevator, the car of the elevator is likely to stop at a non-leveling position, so people will be trapped in the car. At this time, it is necessary to manually release the main engine brake in the elevator, and use the car's own weight to slide down to the bottom layer to realize personnel rescue. [0003] In the process of car descent, in order to ensure the safety of personnel and equipment while the car is descending, it is required that the car's descent speed be below a safe speed. [0004] In the prior art, the above requirements are achieved by using a mechanical friction device. That is, when the brake of the main engine is released, the ca...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B66B5/02
Inventor 吴攀洪浩王伟峰
Owner JIANGSU SANSI WIND POWER TECH