CN104176577A - Device and method for detecting absolute position of elevator car - Google Patents

Abstract

The invention discloses an elevator car absolute position detection device and a detection method. The elevator car absolute position detection device includes a speed limiter, a tension device, a ring-shaped speed limit rope, a pressing roller group, and at least one rotary encoder , the pinch roller set includes a first pinch roller and a second pinch roller, the first pinch roller and the second pinch roller are oppositely arranged on both sides of the speed limit rope on one side of the speed limiter, and the speed limiter The rope is compressed, and one of the rotary encoders is fixedly mounted on the first compression roller. During detection, press the speed limiting rope between the first pressing roller and the second pressing roller, drive the speed limiting rope to run when the car goes up or down, and the speed limiting rope drives the first pressing roller and the second pressing roller. When the roller rotates, the rotary encoder detects the number of rotations of the first pressing roller, and the absolute position of the car can be obtained after calculation. The above-mentioned elevator car absolute position detection device has high measurement accuracy, is easy to install and adjust, and can accurately detect the absolute position of the elevator car.

Description

Elevator car absolute position detection device and detection method

technical field

The invention relates to the technical field of elevators, in particular to an elevator car absolute position detection device and detection method.

Background technique

As a means of transportation for people to go up and down buildings in people's lives, elevators are very important for their safety. The control system of the elevator must accurately detect the absolute position of the car. At present, in the elevator industry, the method for detecting the absolute position of the car is mainly the motor traction sheave Rotary encoder measurement method, this method is to install a rotary encoder on the shaft of the motor traction wheel, and realize the detection of the motor speed and the position of the car through the signal fed back by the rotary encoder. This method has many shortcomings:

A. The motor traction sheave is used as the power mechanism of the elevator. Its inertia is large, and the dynamic moment and load change drastically. The location data has large errors.

B. During the running of the express train, when the elevator encounters a fault and needs to stop urgently, the brake is released, and the motor traction sheave stops in an emergency. Due to the huge inertia of the car, the steel wire rope will slip obviously with the motor traction sheave. At this time, the motor traction The pulley stops due to the action of the brake, and the rotary encoder cannot detect the slipping distance of the wire rope.

C. Since the elevator skids at an emergency stop, the slipping distance cannot be detected. After the elevator fault is eliminated, it needs to run at a low speed to the base station for position correction before releasing the trapped passengers and returning to normal. When the building is high, its lifting height is high, and the low speed It takes a long time to run to the base station.

Therefore, it is very necessary to provide an elevator car absolute position detection device and detection method with high measurement accuracy.

Contents of the invention

Based on this, the object of the present invention is to overcome the defects of the prior art, provide a detection device and detection method for the absolute position of the elevator car, and realize the accurate detection of the absolute position of the elevator car.

Its technical scheme is as follows:

An absolute position detection device for an elevator car, comprising a speed limiter, a tensioning device, a ring-shaped speed limit rope, a set of pressing rollers, and at least one rotary encoder, the speed limit rope is wound around the speed limiter, on the tensioning device, and can rotate relative to the speed limiter and the tensioning device, the speed limit rope on one side of the speed limiter is fixedly connected with the car, and the pressing roller set includes the first pressure Tightening rollers, second pressing rollers, the first pressing rollers and the second pressing rollers are relatively arranged on both sides of the speed limiting rope on one side of the speed governor, and compress the speed limiting rope, wherein One said rotary encoder is fixedly mounted on said first pinch roller.

Its further technical characteristics are as follows:

There are two rotary encoders, one of which is fixedly mounted on the axle of the first pinch roller, and the other rotary encoder is fixedly mounted on the axle of the second pinch roller .

The elevator car absolute position detection device also includes a mounting platform, the mounting platform is arranged in the machine room, and the first pinching roller and the second pinching roller are respectively installed on the mounting platform.

The elevator car absolute position detection device also includes an elastic member, the first pressing roller is fixed on the installation platform, and the elastic member presses the second pressing roller to press the speed limiting rope on the first pressing roller. Between the pinch roller and the second pinch roller.

The elevator car absolute position detection device also includes a travel switch, the elastic member is a spring, and the travel switch is used to adjust the pretightening force of the spring.

The elevator car absolute position detection device also includes a control system electrically connected to the rotary encoder.

The present invention also provides a method for detecting the absolute position of the elevator car, the method comprising the steps of:

(1) Press the speed-limiting rope between the first pressing roller and the second pressing roller, and connect the speed-limiting rope on one side of the speed governor to the car;

(2) The car goes up or down, and drives the speed-limiting rope to run at the same time, and the speed-limiting rope drives the first pinch roller and the second pinch roller to rotate;

(3) The rotary encoder detects the number of rotations of the first pressing roller, and the absolute position of the car can be obtained after calculation.

Further, rotary encoders are arranged on the axles of the first pinch roller and the second pinch roller, and the data of the two rotary encoders are calculated and compared, and when the feedback signals of the two rotary encoders are consistent, read data; when the feedback signals of the two rotary encoders are inconsistent, re-enter step (1).

Further, fix the first pinch roller on the installation platform, press the spring on the second pinch roller, make the speed limit rope be pressed between the first pinch roller and the second pinch roller, and set the stroke The switch adjusts the spring preload.

The advantages or principles of the foregoing technical solutions are described below:

In the above-mentioned absolute position detection device for the elevator car, the speed limit rope on one side of the speed governor is fixedly connected to the car, and the speed limit rope can reflect the displacement of the car without deviation. The first pressing roller, the second pressing roller The tight rollers are arranged on both sides of the speed limit rope on one side of the speed limiter to realize the conversion from the linear motion of the speed limit rope to the rotational movement of the pinch roller shaft. One of the rotary encoders is fixedly installed on the first pinch roller On the top, the rotary encoder detects the number of rotations of the first pinch roller to obtain the absolute position of the car.

The method for detecting the absolute position of the elevator car mentioned above ensures reliable transmission of the speed-limiting rope and the pressing roller group without mechanical slippage by pressing the speed-limiting rope between the first and second compression rollers; The speed limit rope on one side of the speed limiter is fixedly connected with the car, and the speed limit rope can reflect the displacement of the car without deviation. The moment of inertia of the pinch roller is small, much smaller than that of the motor traction wheel, so the elastic slip of the speed limit rope on the pinch roller can be ignored, and the absolute position of the car can be accurately obtained through the rotary encoder.

Description of drawings

Fig. 1 is a schematic structural view of an elevator car absolute position detection device according to an embodiment of the present invention;

FIG. 2 is a partially enlarged view of FIG. 1 .

Explanation of reference signs:

1. Speed governor, 20. The first pressing roller, 21. The second pressing roller, 3. Rotary encoder, 4. Mounting platform, 5. Spring, 6. Travel switch, 7. Speed limiting rope, 8. Tensioning device, 9, car.

Detailed ways

Embodiments of the present invention are described in detail below in conjunction with accompanying drawings:

As shown in Figure 1, a kind of elevator car absolute position detection device, comprises speed limiter 1, tensioning device 8, annular speed limiter rope 7, pressing roller group, at least one rotary encoder 3, described limiter The speed rope 7 is wound on the speed limiter 1 and the tensioning device 8, and can rotate relative to the speed limiter 1 and the tensioning device 8, and the speed limiter 1 passes through the speed limiter rope 7. Lift the tensioning device 8, the speed limiting rope 7 on one side of the speed governor 1 is fixedly connected to the car 9, and the pressing roller set includes a first pressing roller 20, a second pressing roller 21. The first pressing roller 20 and the second pressing roller 21 are relatively arranged on both sides of the speed limiting rope 7 on one side of the speed governor 1, and press the speed limiting rope 7 tightly. The rotary encoder 3 is fixedly mounted on the first pressing roller 20. In the above-mentioned absolute position detection device for the elevator car, the speed limit rope 7 on one side of the speed limiter 1 is fixedly connected to the car 9, and the speed limit rope 7 can reflect the displacement of the car 9 without deviation. The roller 20 and the second pinch roller 21 are relatively arranged on both sides of the speed limit rope 7 on one side of the speed limiter 1, realizing the conversion from the linear motion of the speed limit rope 7 to the rotary motion of the pinch roller shaft, one of which rotates The encoder 3 is fixedly installed on the first pinch roller 20, the rotary encoder 3 detects the number of rotations of the first pinch roller 20, and after calculation, the absolute position of the car 9 is obtained, and the absolute position detection device of the elevator car realizes Accurate detection of the absolute position of the elevator car.

As shown in Figure 2, there are two rotary encoders 3 in this embodiment, one of which is fixedly mounted on the axle of the first pinch roller 20, and the other rotary encoder 3 It is fixedly installed on the axle of the second pinch roller 21 . The diameters of the first pinch roller 20 and the second pinch roller 21 can be the same or different. The control system calculates and compares the feedback signals of the two encoders. When the feedback signals of the two rotary encoders 3 are consistent, read Get the data, ensure the accurate judgment of car 9 positions.

This embodiment also includes an installation platform 4, the installation platform 4 is set in the machine room, and the first pressing roller 20 and the second pressing roller 21 are installed on the installation platform 4 respectively. The mounting table 4 makes the installation of the first pinch roller 20 and the second pinch roller 21 more firm.

This embodiment also includes an elastic member, the first pressing roller 20 is fixed on the installation platform 4, and the elastic member presses the second pressing roller 21 to compress the speed limiting rope 7 on the first pressing roller 21. Between the pinch roller 20 and the second pinch roller 21 , the elastic member provided can better compress the speed limiting rope 7 between the first pinch roller 20 and the second pinch roller 21 .

This embodiment also includes a travel switch 6 , the elastic member is a spring 5 , and the travel switch 6 is used to adjust the pretightening force of the spring 5 . The pre-tightening force of the spring 5 is adjusted by the travel switch 6 to ensure reliable transmission of the speed limiting rope 7 and the pressing roller group.

This embodiment also includes a control system, the control system is electrically connected with the rotary encoder 3 . The control system calculates and compares the feedback signal of the rotary encoder 3 to judge whether the absolute position detection device of the elevator car is working normally.

A method for detecting the absolute position of an elevator car, the method comprising the steps of:

(1) Compress the speed-governing rope 7 between the first hold-down roller 20 and the second hold-down roller 21, and the speed-governing rope 7 on one side of the speed limiter 1 is fixedly connected with the car 9;

(2) The car 9 goes up or down, and simultaneously drives the speed-limiting rope 7 to run, and the speed-limiting rope 7 drives the first pinch roller 20 and the second pinch roller 21 to rotate;

(3) The rotary encoder 3 detects the number of rotations of the first pinch roller 20, and the absolute position of the car 9 can be obtained after calculation.

The speed-limiting rope 7 is compressed between the first compacting roller 20 and the second compacting roller 21 to ensure reliable transmission of the speed-limiting rope 7 and the compacting roller group without mechanical slipping. The speed limit rope 7 on one side of the speed limiter 1 is fixedly connected with the car 9, and the speed limit rope 7 can reflect the displacement of the car 9 without deviation. The linear motion of the speed-limiting rope 7 is converted into the shaft rotation movement of the pressing roller group. The moment of inertia of the pressing roller is small, much smaller than that of the motor traction wheel, so the elastic slippage of the speed-limiting rope 7 on the pressing roller can be ignored Excluding. The rotary encoder 3 can efficiently calculate the absolute position of the car 9 .

Further, rotary encoders 3 are arranged on the axles of the first pinch roller 20 and the second pinch roller 21, and the data of the two rotary encoders 3 are calculated and compared. When the two rotary encoders 3 feedback signals When consistent, read the data; when the feedback signals of the two rotary encoders 3 are inconsistent, re-enter step (1). The control system calculates and compares the feedback signals of the two encoders. When the feedback signals of the two rotary encoders 3 are consistent, the data is read to ensure the accurate judgment of the position of the car 9. When the feedback signals of the two rotary encoders 3 When inconsistent, readjust the speed-limiting rope 7 so that it is compressed between the first pinch roller 20 and the second pinch roller 21 .

Further, the first pinch roller 20 is fixedly installed on the installation platform 4, and the spring 5 is pressed on the second pinch roller 21, so that the speed limiting rope 7 is pressed against the first pinch roller 20 and the second pinch roller. 21, and the travel switch 6 is set to adjust the pretightening force of the spring 5. The installation table 4 makes the installation of the first pressing roller 20 and the second pressing roller 21 more firm, and the preload of the spring 5 is adjusted through the travel switch 6 to ensure that the transmission of the speed limiting rope 7 and the pressing roller group is reliable .

The above-mentioned embodiments only express the specific implementation manner of the present invention, and the description thereof is relatively specific and detailed, but should not be construed as limiting the patent scope of the present invention. It should be pointed out that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention, and these all belong to the protection scope of the present invention.

Claims (9)

1. a detector for absolute position of elevator lift car, it is characterized in that, comprise velocity limiter, tightening device, the speed limit rope of ring-type, pinch rollers group, at least one rotary encoder, described speed limit rope is around described velocity limiter, on described tightening device, and can relatively described velocity limiter, described tightening device rotates, this velocity limiter wherein speed limit rope of a side is fixedly connected with car, described pinch rollers group comprises the first pinch rollers, the second pinch rollers, described the first pinch rollers, described the second pinch rollers is oppositely arranged on the wherein both sides of the speed limit rope of a side of velocity limiter, and speed limit rope is compressed, described in one of them, rotary encoder is fixedly mounted in described the first pinch rollers.

2. detector for absolute position of elevator lift car according to claim 1, it is characterized in that, described rotary encoder is two, described in one of them, rotary encoder is fixedly mounted on the wheel shaft of described the first pinch rollers, and described in another, rotary encoder is fixedly mounted on the wheel shaft of described the second pinch rollers.

3. detector for absolute position of elevator lift car according to claim 2, is characterized in that, also comprises erecting bed, and described erecting bed is arranged in machine room, and described the first pinch rollers, the second pinch rollers are arranged on respectively on described erecting bed.

4. detector for absolute position of elevator lift car according to claim 3, it is characterized in that, also comprise elastic component, described the first pinch rollers is fixedly installed on erecting bed, described elastic component is pressed in described the second pinch rollers, and described speed limit rope is pressed between the first pinch rollers and the second pinch rollers.

5. detector for absolute position of elevator lift car according to claim 4, is characterized in that, also comprises travel switch, and described elastic component is spring, and described travel switch is for adjusting the predetermincd tension of described spring.

6. according to the detector for absolute position of elevator lift car described in claim 1-5 any one, it is characterized in that, also comprise control system, described control system and described rotary encoder are electrically connected.

7. a method of inspection for elevator sedan absolute position, is characterized in that, the method comprises the steps:

(1) speed limit rope is pressed between the first pinch rollers and the second pinch rollers, by velocity limiter wherein the speed limit rope of a side be fixedly connected with car;

(2) car is up or descending, drives the operation of speed limit rope simultaneously, and moving the first pinch rollers of speed limit rope band and the second pinch rollers are rotated;

(3) rotary encoder detects the rotation number of turns of the first pinch rollers, the absolute location that can draw car after computing.

8. the method for inspection of elevator sedan absolute position as claimed in claim 7, is characterized in that, further comprises the steps:

On the wheel shaft of the first pinch rollers and the second pinch rollers, rotary encoder is all set, the data of two rotary encoders are carried out to computing, comparison, when two rotary encoder feedback signals are consistent, reading out data; When two rotary encoder feedback signals are inconsistent, reenter step (1).

9. the method for inspection of elevator sedan absolute position as claimed in claim 6, is characterized in that, further comprises the steps:

The first pinch rollers is fixedly installed on erecting bed, spring is pressed in the second pinch rollers, speed limit rope is pressed between the first pinch rollers and the second pinch rollers, and the predetermincd tension that travel switch is adjusted spring is set.