Fault detection method for traction system and braking system of elevator

Abstract

The invention discloses an elevator traction system and brake system fault detection method which comprises the following steps: step 1, (1) obtaining a reference value of the number of rotation radians of a main engine rotor, and (2) determining an error redundancy value of the number of rotation radians; step 2, obtaining a test value of the rotation radian number of the main engine rotor through a brake test; 3, evaluating the test value: if the difference between the test value and the reference value exceeds an error redundancy value, judging that the test value is abnormal; if not, the operation is normal; wherein when the difference between the test value and the reference value exceeds the error redundancy value, if the test value changes suddenly, the traction system has a fault, and if the test value changes slowly, the braking system has a fault. According to the invention, elevator fault monitoring is carried out in a dynamic mode, a real braking working condition is restored, and various faults in a traction system and a braking system can be monitored.

Description

Technical Field

[0001] The present invention relates to the technical field of special equipment inspection, and in particular to a method for detecting faults of an elevator traction system and a brake system. Background Art

[0002] Traction elevator is a commonly used vertical transportation tool, which plays an irreplaceable role in daily travel.

[0003] At present, the system cannot automatically identify changes in the quality of the traction drive elevator system, and the system cannot automatically identify changes in the balance coefficient, which poses a great safety hazard. Braking system monitoring includes monitoring of braking force and brake action (correct opening and closing). In order to reduce the elevator failure rate, the monitoring of brake action generally has a long delay time, that is, when the system detects abnormal brake action (not correctly opened or closed), it delays for a certain period of time. If the abnormality still exists, the system enters the fault program, otherwise it continues to run. Common faults such as brake jamming and brake asynchrony cannot be monitored. Brake jamming and brake asynchrony often exist for a long time and are common before an accident occurs, and the monitoring of brake action cannot detect this fault.

[0004] Braking force monitoring often uses a static method. The brake is in a closed state. The traction machine is under a certain stall current. The braking force meets the requirements by judging whether it is running. This test method cannot reflect the actual braking condition, nor can it monitor common faults such as brake sticking and asynchronous brake action. Summary of the invention

[0005] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a method for detecting faults in an elevator traction system and a braking system, which can monitor elevator faults in a dynamic manner, restore the actual braking conditions, and monitor various faults in the traction system and the braking system.

[0006] The objective of the present invention is achieved through the following technical solutions:

[0007] A method for detecting faults in an elevator traction system and a brake system comprises the following steps:

[0008] Step 1: (1) obtaining a reference value of the number of radians of rotation of the main engine rotor, and (2) determining an error margin value of the number of radians of rotation of the main engine rotor;

[0009] Step 2: Obtain the test value of the number of rotation arcs of the main engine rotor through a braking test;

[0010] Step 3: Evaluate the test value: if the difference between the test value and the reference value exceeds the error redundancy value, it is judged as abnormal; otherwise, it is normal; among them, when the difference between the test value and the reference value exceeds the error redundancy value, if the test value changes suddenly, it is a traction system failure, and if the test value changes slowly, it is a braking system failure.

[0011] Furthermore, the elevator is calculated by the preset elevator parameters. The elevator runs at a speed V to a specified position as the starting point. The brake starts braking. The number of radians of the main engine rotor rotation when stopping is the reference value in step one.

[0012] Furthermore, after the elevator is debugged, the elevator is run at a speed V to a specified position for a braking test, and the number of arcs of rotation of the main engine rotor when the elevator brake is applied is recorded as the reference value in step one.

[0013] Furthermore, the preset elevator parameters include car weight, counterweight weight, traction wire rope or covering belt weight, compensation chain weight, accompanying cable weight, main engine rotor moment of inertia J, and brake braking torque M1.

[0014] Furthermore, the designated position is a position when the car and the counterweight are at the same level or a position after the car and the counterweight are misaligned.

[0015] Furthermore, the number of radians of rotation of the main engine rotor when the elevator brake is applied is recorded by an encoder.

[0016] Furthermore, in step three, if the difference between the test value and the reference value exceeds the error redundancy value, it is judged as abnormal, and an abnormal result is generated at the same time, and the test value and the abnormal result are transmitted to the control main board, and the elevator stops running; conversely, when it is judged as normal, a normal result is generated, and the test value and the normal result are transmitted to the control main board, and the elevator runs normally.

[0017] The beneficial effects of the present invention are:

[0018] 1) The present invention monitors elevator faults in a dynamic manner, restores the actual braking condition, and can monitor multiple faults in the traction system and the braking system. Multiple faults can be reported.

[0019] 2) The present invention fully utilizes the existing parts of the elevator, does not need to add new parts, performs fault monitoring through algorithms and programs, and has low detection costs.

[0020] 3) The detection method of the present invention is safer and can make up for the shortcomings of the prior art (such as the inability to monitor brake jam). DETAILED DESCRIPTION

[0021] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0022] The present invention provides a technical solution:

[0023] Embodiment 1:

[0024] A method for detecting faults in an elevator traction system and a brake system comprises the following steps:

[0025] Step 1: (1) Obtain the reference value of the host rotor rotation radian (or angle, all radians below can be replaced by angle):

[0026] The calculation is performed based on the preset elevator parameters. The elevator runs at a speed V to a specified position as the starting point. The brake starts braking. The number of arcs the main engine rotor rotates when the brake stops is the reference value in step 1. The calculation method is a prior art, and specific reference is made to the rotor's rotation differential equation, which will not be described in detail here.

[0027] The designated position is the position when the car and the counterweight are at the same level or any position after the car and the counterweight are misaligned (here, any position: any position selected after the car and the counterweight are misaligned, but after the position is selected, each time the elevator parameter calculation is performed, the designated position is the aforementioned selected position). In this embodiment, for the convenience of calculation, the designated position is the position when the car and the counterweight are at the same level.

[0028] The preset elevator parameters include car weight, counterweight weight, traction wire rope or covering belt weight, compensation chain weight, accompanying cable weight, main engine rotor moment of inertia J, and brake braking torque M1.

[0029] (2) Determine the error margin value of the rotation radian number. The error margin value is an empirical value, the smaller it is, the safer it is; in this embodiment, the value range is 5°-10°.

[0030] Step 2: Through the braking test (the time and frequency of the test are determined according to the elevator design), the host encoder measures the number of rotation pulses of the host and converts it into the test value of the rotation radian number (or angle number).

[0031] Among them, braking test: the car runs downward at a certain speed v. When the car and the counterweight run to the same horizontal position, the brake is activated to stop the car. The rotation pulse value of the host encoder is recorded from the time the car runs to the specified position to the time the traction machine stops running, and converted into the test value of radians (or angles).

[0032] Each time the brake test is performed, the brake starts to work when the car moves to the same position, which is convenient for comparison of test data after the test is completed. The designated position of the car in the brake test can be changed again after recalculation or debugging.

[0033] Similarly, the car can also run upward at a certain speed, with other information remaining unchanged, and the effect is equivalent to running downward.

[0034] Step 3: Evaluate the test value: If the test value If the difference with the reference value exceeds the error redundancy value, it is judged as abnormal; at the same time, an abnormal result is generated, and the test value and abnormal result are transmitted to the control mainboard, and the elevator stops running;

[0035] Otherwise, it is normal and generates normal results, and transmits the test values ​​and normal results to the control mainboard, and the elevator operates normally. Among them, the detection data (test values) can also be recorded in the elevator storage unit to evaluate the use process of the elevator traction system and control system.

[0036] Among them, when the difference between the test value and the reference value exceeds the error redundancy value, if the test value changes suddenly, it is a traction system failure, and if the test value changes slowly, it is a brake system failure.

[0037] According to the rotor rotation differential equation: Where M2 is the friction torque of the traction wire rope or the covering belt on the traction wheel.

[0038] In the braking test, brake jam (or suspected jam), asynchronous brake action, insufficient or excessive braking force, failure to fully open the brake, oil stains on the brake, abnormal brake response time, etc. will affect the brake torque M1. Based on the effect analysis, M1 is a dynamic time function; when the car weight, counterweight weight, balance coefficient, traction wire rope or covering belt weight (line mass), compensation connection weight (line mass), and accompanying cable weight (line mass) change, M2 will also change accordingly; the main engine rotor moment of inertia J is a constant, and for a driving main engine, J does not change with time.

[0039] M1 is affected by the brake itself. As the service life increases, M1 may change. M2 is a constant under normal circumstances. When the traction system is repaired, M2 will change, such as car decoration (affecting the weight of the car), changes in the counterweight block (affecting the counterweight weight), changes in the balance coefficient, and replacement of traction wire ropes or free cables with different line quality will also affect the effect of M2. The change of M1 is natural and slow, and the change of M2 is sudden. The moment of inertia J is a constant, so the test value of the number of radians (or angles) of rotation of the rotor is The change of can measure some faults in the traction system and the braking system, that is, the test value of the number of rotation arcs (or angles) If it changes slowly, it means M1 changes, corresponding to the abnormality of the brake (brake system); and the test value of the rotation arc (or angle) Sudden changes correspond to changes in M2 and abnormalities in the traction system.

[0040] Record each test data and test results, predict some faults in the traction system and brake system through self-learning, and prompt maintenance.

[0041] The present invention monitors elevator faults in a dynamic manner and restores the real braking condition. It can monitor various faults in the traction system and the braking system and detect the faults through only one parameter. Multiple faults can be reported.

[0042] The present invention fully utilizes existing parts of the elevator without adding new parts, performs fault monitoring through algorithms and programs, and has low detection cost.

[0043] The detection method of the present invention is safer and can make up for the deficiencies of the prior art (such as the inability to monitor brake jam).

[0044] Example 2

[0045] The difference between this embodiment and embodiment 1 is that the method for obtaining the reference value is different, specifically: after the elevator is debugged, the elevator runs to a specified position at a speed V for a braking test, and the number of radians of rotation of the main engine rotor when the elevator brake is applied is recorded by the encoder, which is the reference value in step one.

[0046] The above is only a preferred embodiment of the present invention. It should be understood that the present invention is not limited to the form disclosed herein, and should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be modified within the scope of the concept described herein through the above teachings or the technology or knowledge of the relevant field. The changes and modifications made by those skilled in the art shall not deviate from the spirit and scope of the present invention, and shall be within the scope of protection of the claims attached to the present invention.

Claims

1. A method for detecting faults in an elevator traction system and a brake system, characterized in that: The following steps are included: Step 1: (1) obtaining a reference value of the number of radians of rotation of the main engine rotor, and (2) determining an error margin value of the number of radians of rotation of the main engine rotor; Step 2: Obtain the test value of the number of rotation arcs of the main engine rotor through a braking test; Step 3: Evaluate the test value: if the difference between the test value and the reference value exceeds the error redundancy value, it is judged as abnormal; otherwise, it is normal; among them, when the difference between the test value and the reference value exceeds the error redundancy value, if the test value changes suddenly, it is a traction system failure, and if the test value changes slowly, it is a braking system failure.

2. The elevator traction system and brake system fault detection method according to claim 1, characterized in that: The elevator is calculated based on the preset elevator parameters. The elevator runs at a speed V to the specified position as the starting point, and the brake begins to brake. The number of arcs the main engine rotor rotates when it stops is the reference value in step one.

3. The elevator traction system and brake system fault detection method according to claim 1, characterized in that: After debugging the elevator, the elevator runs at speed V to the specified position for a braking test. The number of arcs the main engine rotor rotates when the elevator brake is applied is recorded as the reference value in step one.

4. The elevator traction system and brake system fault detection method according to claim 2, characterized in that: The preset elevator parameters include car weight, counterweight weight, traction wire rope or covering belt weight, compensation chain weight, accompanying cable weight, main engine rotor moment of inertia J, and brake braking torque M1.

5. The elevator traction system and brake system fault detection method according to claim 2 or 3, characterized in that: The designated position is the position when the car and the counterweight are at the same level or the position after the car and the counterweight are misaligned.

6. The elevator traction system and brake system fault detection method according to claim 3, characterized in that: The number of arcs the main engine rotor rotates when the elevator brake is applied is recorded by the encoder.

7. The elevator traction system and brake system fault detection method according to claim 1, characterized in that: In step 3, if the difference between the test value and the reference value exceeds the error redundancy value, it is judged as abnormal, and an abnormal result is generated at the same time. The test value and the abnormal result are transmitted to the control main board, and the elevator stops running; On the contrary, when it is judged to be normal, a normal result is generated, and the test value and the normal result are transmitted to the control main board, and the elevator runs normally.