CN213294343U

CN213294343U - Device for online detecting ascending overspeed protection function of elevator car

Info

Publication number: CN213294343U
Application number: CN202021679630.3U
Authority: CN
Inventors: 刘小畅; 蒋涛; 王海玲; 张鹏; 马建强
Original assignee: Shanghai Special Equipment Supervision and Inspection Technology Institute
Current assignee: Shanghai Special Equipment Supervision and Inspection Technology Institute
Priority date: 2020-08-13
Filing date: 2020-08-13
Publication date: 2021-05-28
Anticipated expiration: 2030-08-13

Abstract

The utility model discloses a device for detecting the ascending overspeed protection function of an elevator car on line, which comprises a steel wire rope, wherein the two ends of the steel wire rope are respectively connected with the car and a counterweight, and the middle of the steel wire rope is hung on two rollers; one side of the steel wire rope at the machine room position is provided with an elevator car ascending overspeed protection device. The utility model discloses a device sets up near elevator machine room drive host computer, detects wire rope functioning speed and deceleration through laser displacement sensor, detects elevator speed and deceleration when car functioning speed and car go upward overspeed protection device action indirectly for detection personnel can go upward overspeed protection device's function by quick, the accurate detection car, in time discovers the defect that the device exists.

Description

Device for online detecting ascending overspeed protection function of elevator car

Technical Field

The utility model relates to an on-line measuring elevator car goes upward overspeed protect function's device belongs to elevator technical field.

Background

The safety gear of the elevator car is a protection device for overspeed descending caused by falling of the car, and the protection for ascending of the car is implemented by an overspeed ascending protection device. The overspeed protection device is an important safety protection device on the elevator. An elevator car crash accident due to its failure occurs occasionally. For example, in 2015, 8 months, 20 days and evening, a resident building in the north area of the sea lock is reached, and when a resident takes the elevator from the 1 st building to the 25 th building, the elevator directly slides and rushes to the top without stopping at the 25 th building, so that the top guard rail of the elevator car is deformed, the suspended ceiling of the elevator car falls off, and the fracture of the thigh of the resident is taken for medical service, so that the resident is fortunate and has no life risk. The accident investigation shows that the car ascending overspeed protection device of the elevator does not act.

At present, a tester detects the car ascending overspeed protection device on site without a special instrument, mainly inspects the stopping distance of the elevator by visual inspection, and judges whether the elevator is qualified according to experience.

The national standard GB7588-2003 "elevator manufacturing and installation safety code" states that the car overspeed protection device upstream of the car comprises a speed monitoring (governor) and a deceleration element (brake), and should be able to detect a loss of speed of the upstream car with a lower limit of 115% of the rated speed of the elevator and an upper limit of 1.1 times the speed of the upstream action of the governor, and should be able to arrest the car or at least reduce its speed to the design range of the counterweight buffer. When the car ascending overspeed protection device stops an empty car, the deceleration of the car ascending overspeed protection device is not larger than 1 gn.

Disclosure of Invention

The to-be-solved technical problem of the utility model is: how to quickly and accurately detect the overspeed protection device on the lift car.

In order to solve the technical problem, the technical scheme of the utility model is to provide a device for on-line detection of elevator car up-going overspeed protection function, including wire rope, wire rope's both ends respectively with the car, to heavy being connected, the middle of wire rope is hung on two gyro wheels, its characterized in that, wire rope one side between two gyro wheels is equipped with detection device, detection device includes the laser displacement sensor that detects wire rope functioning speed and deceleration; one side of the steel wire rope at the machine room position is provided with an elevator car ascending overspeed protection device.

Preferably, the detection device further comprises a CPU, a memory and a display, wherein the CPU is respectively connected with the memory, the display and the laser displacement sensor.

Preferably, the detection device further comprises a trigger which is arranged on the safety loop relay and acts synchronously with the safety loop relay, and the trigger is connected with the CPU.

Preferably, a plurality of screw pitches are uniformly distributed on the surface of the steel wire rope.

The utility model discloses a device sets up near elevator machine room drive host computer, detects wire rope functioning speed and deceleration through laser displacement sensor, detects elevator speed and deceleration when car functioning speed and car go upward overspeed protection device action indirectly for detection personnel can go upward overspeed protection device's function by quick, the accurate detection car, in time discovers the defect that the device exists.

Drawings

Fig. 1 is a schematic structural diagram of a device for detecting an overspeed protection function of an elevator car on line;

FIG. 2 is a line drawing of a steel wire rope thread curve detected by a constant speed running sensor;

FIG. 3 is a diagram of a sensor detecting a wire rope thread profile during braking;

FIG. 4 is a graph of time and velocity;

FIG. 5 is a schematic diagram of a laser displacement sensor detecting a wire rope;

fig. 6 is a functional block diagram of an apparatus for online detection of an overspeed protection function in an elevator car.

Detailed Description

In order to make the present invention more comprehensible, preferred embodiments are described in detail below with reference to the accompanying drawings.

The utility model provides an on-line measuring elevator car goes upward overspeed protect function's device, as shown in fig. 1, fig. 6, it includes wire rope 3, wire rope 3's both ends respectively with car 1, to heavy 2 connections, hang on two gyro wheels 6 in the middle of

wire rope

3, 3 one sides of wire rope between two gyro wheels 6 are equipped with detection device 4, detection device 4 is including the laser displacement sensor 5 that detects 3 functioning speed of wire rope and deceleration, CPU, the memory, the display, CPU connects the memory respectively, display and laser displacement sensor 5. A plurality of screw pitches are uniformly distributed on the surface of the steel wire rope 3. The detection device 4 further comprises a trigger which is connected with the CPU, and the trigger is arranged on the safety loop relay and acts synchronously with the safety loop relay.

As shown in fig. 5, the laser displacement sensor 5 acquires the number of the thread pitches of the wire rope 3 passing through in a certain time by acquiring the change of the distance d of the thread pitch on the surface of the wire rope 3, indirectly measures the moving speed of the wire rope 3, and differentiates the speed to acquire the deceleration during braking.

Before detection, parameters such as a wire rope pitch distance d, a rope winding ratio and the like are set.

When the elevator normally operates, the utility model discloses a device record elevator functioning speed, when the people for making going upward of overspeed electric safety device or the stop device action of overspeed governor, electric safety circuit disconnection, safety circuit relay release simultaneously drives the trigger action, and switching signal of release gives CPU, triggers CPU and begins to record elevator braking process's data, obtains speed through the displacement differential, and the speed differential reachs the deceleration.

Use the utility model discloses a method that detection device detected as follows:

a) in the maintenance state of the elevator, the electric safety loop should be disconnected by artificially actuating the uplink overspeed electric safety device of the speed limiter;

b) the elevator is restored to a normal state, the empty car is stopped at the lower part of the elevator stroke, the car runs upwards at the maintenance speed in an empty way, an electrical safety loop is manually disconnected, an up-going overspeed electrical safety device or a stopping device of the speed limiter acts, and the car can stop running;

c) restoring the elevator to a normal state, stopping the empty-load car at the lower part of the elevator stroke, taking measures to prevent the car from moving, fixing a device for detecting the overspeed of the car ascending near a steel wire rope of a machine room, aligning a laser displacement sensor to the steel wire rope, starting the elevator, and setting parameters such as the pitch distance d of the steel wire rope, the rope winding ratio and the like;

d) the lift car moves upwards at a rated speed, and an upward overspeed electric safety device or a stopping device of the speed limiter is manually operated to trigger a speed reducing device to operate;

e) adjusting operation parameters of an elevator control system or other methods to enable the maximum operation speed of the car to be greater than the action speed of the speed limiter, and enabling the car to accelerate and ascend to the speed limiter to trigger the speed reducer to act;

f) and after the test is finished, the elevator is restored to a normal state.

g) And checking the action speed and the deceleration value of the elevator on the detection device, and comparing the action speed and the deceleration value with the national standard value to obtain a final detection result.

As shown in fig. 2-4, when the elevator runs at a constant speed, the thread data of the steel wire rope 3 collected by the laser displacement sensor 5 is an equidistant voltage sine wave; when the elevator is stopped emergently, the running speed of the steel wire rope 3 is reduced until the steel wire rope stops, and the thread data of the steel wire rope 3, which is acquired by the laser displacement sensor 5, is a waveform with constant voltage amplitude and gradually-lengthened wavelength.

Claims

1. A device for detecting an ascending overspeed protection function of an elevator car on line comprises a steel wire rope (3), wherein two ends of the steel wire rope (3) are respectively connected with a car (1) and a counterweight (2), and the middle of the steel wire rope (3) is hung on two rollers (6), and is characterized in that a detection device (4) is arranged on one side of the steel wire rope (3) between the two rollers (6), and the detection device (4) comprises a laser displacement sensor (5) for detecting the running speed and deceleration of the steel wire rope (3); one side of the steel wire rope (3) positioned in the machine room is provided with an elevator car ascending overspeed protection device.

2. The device for on-line detecting the function of the overspeed protection on the elevator car as recited in claim 1, characterized in that the detecting device (4) further comprises a CPU, a memory, and a display, the CPU is respectively connected with the memory, the display, and the laser displacement sensor (5).

3. An apparatus for the on-line detection of the overspeed protection function upstream of an elevator car as set forth in claim 2, characterized in that said detection means (4) further comprises a trigger provided on the safety circuit relay and acting in synchronism therewith, the trigger being connected to the CPU.

4. The device for on-line detecting the function of overspeed protection on the elevator car as recited in claim 1, characterized in that a plurality of pitches are uniformly distributed on the surface of said steel cable (3).