CN105600635A - Elevator brake force detecting method - Google Patents

Abstract

The invention discloses a method for detecting the brake force of an elevator, wherein an elevator with a set load runs in a designated direction under the trigger of a detection instruction, and when the running speed of the elevator reaches the set speed, the absolute position H1 of the current elevator car is recorded Then make the elevator emergency brake; after the elevator stops, record the absolute position H2 of the current elevator car, calculate the distance difference between H1 and H2, and determine the brake force of the elevator when the distance difference is greater than or equal to the first threshold and less than the second threshold In a small state, when the distance difference is greater than or equal to the second threshold, it is judged that the brake force of the elevator is in a seriously small state; when the brake force of the elevator is too small, an alarm signal is sent and the maintenance personnel are prompted to maintain in time, When the brake force of the elevator is too small, a fault signal is issued and the elevator is prohibited from running. The method of the invention is simple and flexible, does not limit the running conditions of the elevator, and can detect the brake force of the elevator at any time according to actual needs.

Description

Detection method of elevator brake force

technical field

The invention relates to the braking technology of an elevator, and specifically belongs to a method for detecting the braking force of an elevator.

Background technique

With the increase of high-rise buildings in cities, elevators are increasingly entering people's lives and becoming an indispensable part of urban life. But in recent years frequently report the generation of elevator accident.

Some experts have analyzed the accidents of vertical elevators, among which 80% of the passenger casualties are caused by the extrusion and shearing of the car door area, and 15% of the passenger casualties are caused by the car's rushing to the top and squatting at the bottom , the others are 5%. The main factors that lead to extrusion, shearing, top rushing, and squatting are the failure of the electronic control system and braking.

The main cause of brake failure due to insufficient braking force or brake failure is also one of the factors causing abnormal movement of the car door area, so sufficient braking force is an important condition to ensure safe and reliable operation of the elevator. In response to the above problems, someone proposed a method to test whether the elevator braking force is sufficient when the elevator is in a dormant state. At present, the detection of the brake force is achieved by applying a predetermined torque when the elevator is stationary or checking whether the elevator moves after opening a brake. of.

For example, the invention patent application with the application number of 201210043620.4 "An automatic detection and control method of elevator braking force", the disclosed method is to detect each group of brakes sequentially when the elevator is in a dormant state and the detection time is reached. When the brake is applied, if the car is displaced, it is confirmed that the group of brakes is faulty, a fault signal is sent and the elevator is stopped. Although this method can detect the braking force state of the elevator conveniently and troubleshoot in time, it has strict requirements and restrictions on the operation of the elevator.

Contents of the invention

The technical problem to be solved by the present invention is to provide a method for detecting the brake force of an elevator, which can detect the brake force of the elevator at any time as required.

In order to solve the problems of the technologies described above, the detection method of the elevator brake force provided by the invention may further comprise the steps:

Step 1. The elevator with the set load runs in the specified direction under the trigger of the detection command. When the running speed of the elevator reaches the set speed, record the absolute position H1 of the current elevator car and make the elevator brake urgently;

Step 2, after the elevator stops, record the absolute position H2 of the current elevator car;

Step 3, calculating the distance difference between the absolute position H1 and the absolute position H2 of the elevator car, when the distance difference is greater than or equal to the first threshold but less than the second threshold, it is determined that the brake force of the elevator is in a relatively small state, When the distance difference is greater than or equal to the second threshold, it is determined that the brake force of the elevator is in a seriously small state, and when the distance difference is smaller than the first threshold, it is determined that the brake force of the elevator is in a normal state.

In the above method, when the braking force of the elevator is relatively small, the elevator controller sends an alarm prompt message; when the braking force of the elevator is seriously small, the elevator stops running.

Preferably, before step 1, it is first judged whether the brake force detection condition is met, and when the brake force detection condition is satisfied, the elevator controller sends a detection instruction, and the brake force detection condition is that the interval time reaches a preset period, the running time At least one of the predetermined time is reached and the number of running times reaches a predetermined value.

Wherein in the above method, the detection instruction is issued by at least one of an elevator controller, a manual, and a remote client.

The detection method of the present invention obtains the movement of the elevator in the process from emergency braking to stop by detecting the distance difference between the absolute position of the elevator car when it reaches the set speed and the absolute position of the elevator car after emergency braking. The situation, so as to judge the situation of the brake force of the elevator, this method is simple and flexible, there is no limit to the operation of the elevator, and the brake force of the elevator can be detected at any time according to actual needs.

Description of drawings

Fig. 1 is the schematic flow chart of detection method of the present invention;

Fig. 2 is another schematic flow chart of the detection method of the present invention.

detailed description

The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

In the detection method provided by the present invention, first ensure that the elevator runs in the detection state, and then control the emergency braking of the elevator, by detecting the difference between the absolute position when the elevator car reaches the set speed and the absolute position at which the elevator car stops after emergency braking. The distance difference can be used to obtain the movement of the elevator in the process from emergency braking to stop, so as to judge the braking force of the elevator.

first embodiment

In the present embodiment, the detection method of elevator brake force, as shown in Figure 1, comprises the following steps:

Step 1. The elevator with the set load runs in the specified direction under the trigger of the detection command. When the running speed of the elevator reaches the set speed, record the absolute position H1 of the current elevator car and make the elevator brake urgently;

The above detection command can be automatically issued by the elevator controller within the set detection period to realize the self-detection of the braking force, for example, first judge whether the detection condition of the braking force is met, and when the detection condition of the braking force is satisfied, the elevator controller sends a detection command , wherein the brake force detection condition is at least one of the three conditions: the interval time reaches the preset period, the elevator running time reaches the predetermined time, and the elevator running times reaches the set value; Terminal detection can be issued manually when needed according to the actual use of the elevator. Of course, the detection command can be issued by any two or three of the elevator controller, manual, and remote client;

In this step, the load of the elevator can be but not limited to no load, such as 50% load, etc.; the running direction of the elevator can be but not limited to set according to the set load, such as up when light load, down when heavy load, etc. ;

Step 2, after the elevator stops, record the absolute position H2 of the current elevator car;

Step 3, calculating the distance difference between the absolute position H1 and the absolute position H2 of the elevator car, when the distance difference is greater than or equal to the first threshold but less than the second threshold, it is determined that the brake force of the elevator is in a relatively small state, When the distance difference is greater than or equal to the second threshold, it is determined that the brake force of the elevator is in a seriously small state, and when the distance difference is smaller than the first threshold, it is determined that the brake force of the elevator is in a normal state.

In addition, preferably, in step 3, when the brake force of the elevator is in a relatively small state, the elevator controller sends an alarm reminder message to remind the maintenance personnel to check, and when the brake force of the elevator is in a seriously small state, it is forbidden to The elevator runs.

second embodiment

In this embodiment, the detection method is as shown in Figure 2, comprising the following steps:

Step 1, judge whether the detection command is received and the elevator is on standby, if yes, enter step 2, otherwise run normally;

When the elevator is in the self-detection state, the elevator controller sends a detection instruction when the detection condition is reached. The detection condition can be that the interval time reaches the preset cycle (such as once a week), the elevator running time reaches the predetermined time, and the elevator operation times reaches the predetermined time. at least one condition in the value;

Step 2: The elevator runs upwards according to the inspection speed. When the elevator runs at a constant speed, record the absolute position H1 of the elevator car and let the elevator brake urgently;

Step 3, after the elevator stops, record the absolute position H2 of the elevator car;

Step 4, calculating the distance difference between the absolute position H1 and the absolute position H2 of the elevator car, wherein the absolute position can be generated according to the direction and the encoder signal when the elevator is running;

When the distance difference is greater than or equal to the first threshold but less than the second threshold, it is determined that the brake force of the elevator is in a relatively small state. At this time, the elevator controller sends an alarm reminder message to remind the maintenance personnel to check; when the distance difference is greater than or equal to the second When the threshold is reached, it is determined that the brake force of the elevator is seriously too small, and the elevator stops running.

The present invention has been described in detail through specific embodiments above, which are only preferred embodiments of the present invention and are not intended to limit the present invention. Without departing from the principles of the present invention, equivalent replacements and improvements made by those skilled in the art should be considered within the technical scope of the present invention.

Claims (4)

1. a detection method of elevator brake force, is characterized in that, comprises the following steps: Step 1. The elevator with the set load runs in the specified direction under the trigger of the detection command. When the running speed of the elevator reaches the set speed, record the absolute position H1 of the current elevator car and make the elevator brake urgently; Step 2, after the elevator stops, record the absolute position H2 of the current elevator car; Step 3, calculating the distance difference between the absolute position H1 and the absolute position H2 of the elevator car, when the distance difference is greater than or equal to the first threshold but less than the second threshold, it is determined that the brake force of the elevator is in a relatively small state, When the distance difference is greater than or equal to the second threshold, it is determined that the brake force of the elevator is in a seriously small state, and when the distance difference is smaller than the first threshold, it is determined that the brake force of the elevator is in a normal state. 2. The detection method of elevator brake force according to claim 1, characterized in that, when the brake force of the elevator is in a relatively small state, the elevator controller sends an alarm message; when the brake force of the elevator is in a serious When it is too small, the elevator stops running. 3. the detection method of elevator brake force according to claim 1, is characterized in that, before step 1, first judge whether to meet the brake force detection condition, when the brake force detection condition is satisfied, the elevator controller sends a detection command , the brake force detection condition is at least one of the interval time reaching a preset period, the running time reaching a predetermined time, and the number of running times reaching a predetermined value. 4. The detection method of the elevator brake force according to claim 1, wherein the detection instruction is issued by at least one of an elevator controller, a manual, and a remote client.