CN103253576B - Elevator car speed monitored control system - Google Patents

Abstract

The present invention provides a kind of elevator car speed monitoring system, comprises elevator control board, wherein, also comprises magnetic scale, and described magnetic scale comprises scale, magnetic scale sensor and control box; Hanging vertically in the elevator shaft, the magnetic grid sensor is fixed on the outer wall of the car, and is connected to the elevator control panel through the control box, and is used to send the collected first speed value of the elevator car to the The elevator control board; the elevator control board is used to receive the first speed value and monitor the speed of the elevator car through the first speed value. The invention can accurately detect the actual speed of the car, and has very high safety and reliability.

Description

Elevator car speed monitoring system

technical field

The invention relates to the technical field of elevator control, in particular to an elevator car speed monitoring system.

Background technique

The operation of the elevator is controlled by the frequency converter according to the preset speed curve in the elevator control system to control the rotation of the motor to adjust the running speed of the car.

The control speed at any moment during the elevator operation can be obtained by the frequency converter from the pulse encoder on the motor shaft. To monitor the actual running speed of the elevator, it is necessary to collect accurate speed values. The traditional elevator car speed monitoring is used in the The technology of installing an encoder on the speed limiter cannot directly obtain the actual speed of the car, but indirectly obtains the speed of the car by measuring the speed of the wire rope. Since the wire rope often slips when the elevator is running, the collected The difference between the actual running speed value of the car and the control speed value of the frequency converter is relatively large, which has a great impact on the safe operation of the elevator.

Contents of the invention

Based on this, the present invention provides an elevator car speed monitoring system, which can accurately detect the actual speed of the car, and has very high safety and reliability.

A speed monitoring system for an elevator car, comprising an elevator control panel, wherein a magnetic scale is also included, and the magnetic scale includes a scale, a magnetic grid sensor and a control box;

The scale of the magnetic scale is vertically suspended in the elevator shaft from the top of the well, and the magnetic grid sensor is fixed on the outer wall of the car, and is connected to the elevator control panel through the control box, and is used to collect the collected data of the elevator car. The first speed value is sent to the elevator control board through the control box;

The elevator control board is used to receive the first speed value and monitor the speed of the elevator car through the first speed value.

In the above-mentioned elevator car speed monitoring system, the magnetic scale is vertically suspended from the top of the shaft in the elevator shaft. The magnetic grid sensor is fixed on the outer wall of the car. The magnetic grid sensor moves with the running of the car, and the magnetic grid sensor collects The actual speed value of the car is connected to the elevator control board through the control box, so the elevator control board can accurately collect the actual speed value of the car when it is running. Series of effective monitoring, system security and reliability are very high.

Description of drawings

Fig. 1 is a structural schematic diagram of an embodiment of the elevator car speed monitoring system of the present invention.

detailed description

The present invention will be described in further detail below in conjunction with the embodiments and accompanying drawings, but the embodiments of the present invention are not limited thereto.

As shown in Figure 1, it is a structural schematic diagram of an embodiment of the elevator car speed monitoring system of the present invention, including an elevator control panel 12, wherein it also includes a magnetic grating ruler 11, and the magnetic grating ruler 11 includes a grating ruler 111, Magnetic grid sensor 112 and control box 113;

The grid scale 111 of magnetic grid scale 11 hangs vertically in the elevator shaft from the top of the shaft, and the magnetic grid sensor 112 is fixed on the outer wall of the car, and is connected to the elevator control board 12 through the control box 113, for collecting all The first speed value of the elevator car is sent to the elevator control board 12 through the control box 113;

The elevator control board 12 is used to receive the first speed value and monitor the speed of the elevator car through the first speed value;

In this embodiment, the scale 111 is vertically suspended in the elevator shaft from the top of the shaft, and the magnetic grid sensor 112 is fixed on the outer wall of the car. When the car moves, the magnetic grid sensor 112 moves with the car, and the magnetic grid sensor 112 moves time passes through the scale 111, so the magnetic scale 11 can accurately collect the actual speed value of the car, which is the above-mentioned first speed value; the magnetic grid sensor 112 is connected to the elevator control board 12 through the control box 113, and the collected car The real-time speed value of the car is sent to the elevator control board 12; after the elevator control board 12 receives the first speed value of the car, a series of speed monitoring can be performed on the elevator car through the first speed value.

In a preferred embodiment, the elevator control panel 12 is also used for:

Obtain the second speed value of the elevator car through the encoder installed on the motor shaft;

Comparing the first speed value with the second speed value, if the difference between the two exceeds the set error range, a deceleration stop instruction is issued;

In this embodiment, the elevator control board 12 can read the first speed value of the elevator car in real time. At the same time, when the elevator car is running, the control board will be preset with a speed curve, and the control board controls the motor to run and drive The elevator car moves according to the preset speed curve, and an encoder is installed on the motor shaft, and the encoder also collects the second speed value of the elevator car in real time, that is, the speed value in the preset speed curve in the above-mentioned control panel;

The elevator control board compares the first speed value with the second speed value in real time, and monitors the speed of the elevator car; when the difference between the two exceeds the set error range, for example, the first speed value is higher than the control board controlled The second speed value, and the difference exceeds the preset error value, and a deceleration and stop command needs to be issued. The error range can be flexibly adjusted through the function code of the inverter, which can adapt to different elevator speeds and site conditions, and significantly improve the reliability and adaptability of the system.

In a preferred embodiment, the elevator control panel 12 can also be used for:

When the elevator car runs to the preset end station position, if the received first speed value is greater than the preset normal deceleration curve speed, a deceleration stop command is issued to control the elevator car to follow the preset special deceleration to slow down;

At the same time, set a position parameter from the end station. Within this position range, if the obtained first speed value of the elevator car is still greater than the speed of the preset special deceleration curve, and it is obtained through the encoder installed on the motor shaft If the second speed value of the elevator car is greater than the preset safety speed threshold, the safety loop is disconnected, and the brake is controlled to stop the elevator car in an emergency.

In this embodiment, by setting the normal deceleration and special deceleration of the elevator, the control board draws theoretically the deceleration curve of the elevator according to the special deceleration and the deceleration curve according to the normal deceleration. The end station position includes the preset upper end station position and lower end station position in the hoistway. The elevator car passes through the preset end station position. If the first speed value of the elevator car obtained by the control board is higher than the preset normal deceleration at this position Curve speed, the control panel sends a deceleration stop command. The elevator car continues to run after passing the end station position, so it is necessary to set the position parameters of the upper end station and the lower end station separately at the same time. From the end station position to the set position, within this position range, if the control board obtains If the first speed value of the elevator car obtained is still greater than the speed of the special deceleration curve, and the second speed value of the elevator car obtained through the encoder installed on the motor shaft is greater than the preset safe speed threshold, the control board is disconnected The safety circuit controls the brake to stop the elevator car in an emergency.

In a preferred embodiment, the elevator control panel 12 can also be used for:

When the obtained first speed value of the elevator car is greater than 110% of the rated elevator speed, a forced deceleration stop command is issued to control the elevator car to decelerate and stop running according to a preset special deceleration;

In this embodiment, the first speed value is collected in real time during the running of the elevator car. When the first speed value is greater than 110% of the rated elevator speed, it means that the current elevator speed is overspeed, and the elevator speed is abnormal. The car is forced to decelerate to stop, and the car is controlled to decelerate according to the preset special deceleration and stop its operation, which can effectively prevent elevator operation accidents and facilitate inspection of equipment.

In a preferred embodiment, the magnetic grid sensor 112 is connected to the control box 113 through a CAN bus, and the control box 113 is connected to the elevator control panel 12 through a CAN bus, and the magnetic field can be quickly transmitted through CAN communication. The data collected by the scale 11 and various control commands transmitted to the elevator control board 12 .

In a preferred embodiment, the bottom of the magnetic scale 11 is equipped with an anti-sway device, which can prevent the suspended magnetic scale from swinging uncontrollably.

In a preferred embodiment, the control box 113 is installed on the top of the car.

In the elevator car speed monitoring system of the present invention, the grid scale of the magnetic grid scale is vertically suspended from the top of the shaft in the elevator shaft. The magnetic grid sensor is fixed on the outer wall of the car, and the magnetic grid sensor moves with the operation of the car. The actual speed value of the car is collected and connected to the elevator control board through the control box. Therefore, the elevator control board can accurately collect the actual speed value of the car when it is running. The elevator control board can monitor the speed of the elevator car through the actual speed value. With a series of effective monitoring, the security and reliability of the system are very high.

The above-mentioned embodiments only express several implementation modes 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 noted 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. Therefore, the protection scope of the patent for the present invention should be based on the appended claims.

Claims (7)

1. A kind of elevator car speed monitoring system, comprises elevator control board, is characterized in that, also comprises magnetic scale, and described magnetic scale comprises scale, magnetic sensor and control box; The scale of the magnetic scale is vertically suspended in the elevator shaft from the top of the well, and the magnetic grid sensor is fixed on the outer wall of the car, and is connected to the elevator control panel through the control box, and is used to collect the collected data of the elevator car. The first speed value is sent to the elevator control board through the control box; The elevator control board is used to receive the first speed value, and obtain the second speed value of the elevator car through an encoder installed on the motor shaft, and compare the first speed value with the second speed value, speed monitoring of the elevator car; The elevator control panel is also used for: When the elevator car runs to the preset end station position, if the received first speed value is greater than the preset normal deceleration curve speed, a deceleration stop command is issued to control the elevator car to follow the preset special deceleration to slow down; At the same time, set a position parameter from the end station. Within this position range, if the obtained first speed value of the elevator car is still greater than the speed of the preset special deceleration curve, and it is obtained through the encoder installed on the motor shaft If the second speed value of the elevator car is greater than the preset safety speed threshold, the safety loop is disconnected, and the brake is controlled to stop the elevator car in an emergency. 2. The elevator car speed monitoring system according to claim 1, wherein the elevator control panel is also used for: The first speed value is compared with the second speed value, and if the difference between the two exceeds a set error range, a deceleration and stop command is issued. 3. The elevator car speed monitoring system according to claim 1, wherein the elevator control panel is also used for: When the obtained first speed value of the elevator car is greater than 110% of the rated elevator speed, a forced deceleration and stop command is issued to control the elevator car to decelerate and stop running according to a preset special deceleration. 4. The elevator car speed monitoring system according to claim 1, wherein the magnetic grid sensor is connected to the control box through a CAN bus, and the control box and the elevator control board are connected through a CAN bus. 5. The elevator car speed monitoring system according to claim 1, further comprising a stroke reduction buffer arranged in the elevator pit. 6. The elevator car speed monitoring system according to claim 1, wherein an anti-swing device is installed at the bottom of the magnetic scale. 7. The elevator car speed monitoring system according to claim 1, wherein the control box is installed on the top of the car.