CN113830637B - Method for detecting balance coefficient of synchronous main machine elevator - Google Patents
Method for detecting balance coefficient of synchronous main machine elevator Download PDFInfo
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- CN113830637B CN113830637B CN202111191969.8A CN202111191969A CN113830637B CN 113830637 B CN113830637 B CN 113830637B CN 202111191969 A CN202111191969 A CN 202111191969A CN 113830637 B CN113830637 B CN 113830637B
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- balance coefficient
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
- B66B5/00—Applications of checking, fault-correcting, or safety devices in elevators
- B66B5/0006—Monitoring devices or performance analysers
- B66B5/0018—Devices monitoring the operating condition of the elevator system
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
- B66B5/00—Applications of checking, fault-correcting, or safety devices in elevators
- B66B5/0006—Monitoring devices or performance analysers
- B66B5/0037—Performance analysers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
- B66B5/00—Applications of checking, fault-correcting, or safety devices in elevators
- B66B5/0087—Devices facilitating maintenance, repair or inspection tasks
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- Maintenance And Inspection Apparatuses For Elevators (AREA)
Abstract
The invention discloses a method for detecting the balance coefficient of a synchronous host elevator, which is an elevator with a machine room synchronous host and comprises the steps that a flexible coupling is connected with an angular speed tester; when the elevator car and the counterweight are at the same horizontal position, the power supply of the elevator is disconnected, and the brake is opened; measuring and recording the average angular acceleration of the traction sheave in the initial short time, repeating the process after the lift car is added with a certain load, and measuring and recording the average angular acceleration of the traction sheave for the second time; and calculating the balance coefficient. The elevator has the advantages that only one angular velocity tester is needed to measure and record the angular acceleration within a certain time before, and fewer weights are used, so that the elevator can run back and forth without repeatedly adding weights; particularly, in places with large flow of people or frequent use, only the elevator freely slides for a short time. The elevator balance coefficient can be calculated by measuring the angular velocity twice, and compared with a current method, the method greatly simplifies the measurement process and shortens the measurement time. Can play a high-efficient role in the aspect of checking and monitoring the balance coefficient of the elevator.
Description
Technical Field
The invention relates to a method for detecting an elevator balance coefficient; in particular to a method for detecting the balance coefficient of a synchronous main elevator.
Background
At present, the existing method for measuring the balance coefficient of an elevator is mainly a current method, namely weights with different weights are loaded in a car, when the car and the counterweight run to the same horizontal height, the current of a driving host machine of the elevator is measured to obtain the current curves of the elevator going upwards and downwards, and the intersection point of the upward curve and the downward curve is the balance coefficient of the elevator. The current method has the defects that firstly, the balance coefficient of the elevator is not clear before measurement, weights are required to be additionally arranged in a car in a distributed grading mode, the elevator can run up and down once when the weights are additionally arranged each time, the elevator cannot normally run at the horizontal positions of the car and the counterweight easily when the up-and-down demand of personnel is large, and the current of a motor cannot reflect the condition of torque when the elevator runs in an acceleration mode and a deceleration mode, so that the method is time-consuming when an old elevator cannot cancel an outbound operation and the elevator taking amount of a building person is large; 2. the number of weights required by the current method is at least half of the rated load of the elevator, if the actual balance coefficient of the elevator is larger than 0.5, the number of required weights is more, otherwise, the uplink and downlink current graphs cannot have cross points, so the method is very laborious.
And the other method is to calculate the balance coefficient of the elevator by monitoring parameters such as current, voltage, power, speed and the like of the elevator driving main machine in up-and-down running and calculating the energy consumption of the elevator. However, this method requires a measurement method using a professional instrument, but this method requires characteristics of the motor, and if the elevator uses a new traction machine, this method cannot accurately measure the balance coefficient; in addition, the method for measuring the current and the voltage driven by the motor needs to connect a lead on a main wiring terminal, and also needs to install a device for testing the speed of the elevator at a traction sheave or a steel wire rope, and although the weight does not need to be added in the whole testing process, the method is complex and time-consuming, and needs to be operated by skilled professionals.
Disclosure of Invention
The invention aims to solve the technical problem of providing a simple, convenient and fast method for measuring and calculating the balance coefficient rapidly.
The technical scheme adopted by the invention is that the method for detecting the balance coefficient of the synchronous main machine elevator, the elevator with the synchronous main machine of a machine room, comprises the following steps,
A. the flexible coupling is connected with the angular speed tester;
B. when the elevator car and the counterweight are at the same horizontal position, the power supply of the elevator is disconnected, and the brake is opened;
C. measuring and recording the average angular acceleration of the traction sheave in the initial short time, repeating the process after a certain load is added to the lift car, and measuring and recording the average angular acceleration of the traction sheave for the second time;
D. and calculating the balance coefficient.
Has an equilibrium coefficient of
Wherein:
m 0 adding weights with known mass into the elevator car for the second time;
ω 1 ，ω 2 angular accelerations of the two measurements;
r is the radius of the traction sheave;
g is a gravitational acceleration constant;
G rated value The weight force to which the rated load of the elevator is subjected;
the flexible coupling is fixed on the axis outside the ferromagnetic traction sheave through a permanent magnet and a bracket; when the elevator has the star protection, the star protection contactor is disconnected, the brake is opened, and the star protection action is avoided.
The elevator has the advantages that only one angular velocity tester is needed to measure and record the angular acceleration within a certain time before, and the used weights are few, so that the elevator can move back and forth without repeatedly adding weights; particularly, in places with large flow of people or frequent use, only the elevator freely slides for a short time. The elevator balance coefficient can be calculated by measuring the angular speed twice, and compared with a current method, the method greatly simplifies the measuring process and shortens the measuring time. Can play a high-efficient role in the aspect of checking and monitoring the balance coefficient of the elevator.
Drawings
FIG. 1 is a schematic diagram of the system of the present invention;
FIG. 2 is a diagrammatic view of the testing apparatus of the present invention;
FIG. 3 is a side view of the testing device of the present invention.
In the figure:
1. the traction sheave 2, the magnet 3, the bracket 4, the angular velocity tester 5, the data display interface 6 and the flexible connector.
Detailed Description
The invention is described in further detail below with reference to the following figures and detailed description:
as shown in fig. 1 to 3, the method for detecting the balance coefficient of a synchronous main machine elevator, which is provided with a synchronous main machine of a machine room, comprises the following steps,
A. one end of a flexible coupling 6 is fixed on the axis outside the ferromagnetic traction wheel 1 through a bracket 3 and a permanent magnet 2, the other end of the flexible coupling is connected with an angular velocity tester 4, and the other end of the angular velocity tester is connected with a data display interface 5;
B. when the elevator car and the counterweight are at the same horizontal position, the power supply of the elevator is disconnected, and the brake is opened; when the star-sealing protection is provided for the elevator, the star-sealing protection contactor is disconnected, so that star-sealing protection action is avoided;
C. measuring and recording the average angular acceleration of the traction sheave in the initial short time, repeating the process after the lift car is added with a certain load, and measuring and recording the average angular acceleration of the traction sheave for the second time;
as shown in FIG. 1, for an elevator with a traction ratio of 1: 1, the angular accelerations measured twice can be set to be omega respectively 1 ，ω 2 (ii) a The balance coefficient is represented by k; by J 0 Representing the moment of inertia of the traction sheave and the system twice;
the pulling force of the two sides of the traction sheave is set as T 1 And T 2 The mass of the counterweight and the empty cage is m 1 And m 2 The gravity is G 1 And G 2 And r is the radius of the traction sheave. For convenient analysis and calculation, various friction forces in the system are ignored, and after the brake is released for a certain time t, the data measured by releasing the brake for the first time is as follows;
G 1 -G 2 -(m 1 +m 2 )ω 1 r＝T 1 -T 2 ＝J 0 ×ω 1 r (1)
adding the known mass m into the cage for the second time 0 After the same time t is measured for the second time:
G 1 -G 2 -m 0 g-(m 1 +m 2 +m 0 )ω 2 r＝T 1 -T 2 ＝J 0 ×ω 2 r (2)
comparing the above formulas (1) and (2), and simplifying to obtain
G 1 -G 2 ＝m 0 ω 1 (ω 2 r+g)/(ω 1 -ω 2 ) (3)
The balance coefficient can be expressed as
G Rated value Indicating the nominal load capacity of the elevator subject to gravity.
Through theoretical calculation, the above formula is still applicable when the traction ratio is changed.
Therefore, the general balance coefficient formula is
E. And calculating the balance coefficient.
The working principle of the method for detecting the balance coefficient of the elevator is that a formula of angular acceleration twice is established through the difference of acceleration values twice, then the formula of the angular acceleration twice is compared, the ratio of the angular velocity is converted into the difference value of the weights at two sides of the traction sheave of the elevator, the purpose of obtaining the quality difference between the counterweight of the elevator and the empty car is achieved by adding weights with certain known mass, and the balance coefficient of the elevator is further solved.
Example 1:
the permanent magnet synchronous main machine has the elevator rated load of 800kg, the traction ratio of 2: 1 and the radius r =0.2m of a traction wheel, and measures the average angular acceleration of the front 2s after the brake is released when the lift car and the counterweight are at the same level. And calculating the balance coefficient of the equipment according to a formula, and correctly analyzing the performance of the elevator.
Example 2: the permanent magnet synchronous main machine has the elevator rated load of 1000kg, the traction ratio of 2: 1 and the traction sheave radius r =0.2m, and measures the average angular acceleration of the front 2s after the brake is released when the lift car and the counterweight are at the same level.
The correctness of the formulas 1 to 5 is verified below, because the sizes of the traction sheave specifications of different elevators are too different, the rotational inertia value of the system cannot be estimated or calculated in consideration of the existence of various masses and frictional forces of the system, so that a fixed unknown quantity needs to be eliminated when the formula is calculated, and the correctness of the formula can be verified by the following three methods:
1. the balance coefficient of an elevator is known, and when k =0.4, the meaning is that the difference of the total mass of the counterweight minus the total mass of the empty car is 0.4 times of the rated load mass of the elevator. As is well known, when the pulling forces on both sides of the traction sheave are the same, the traction sheave does not rotate, i.e., the angular acceleration of the traction sheave is 0, and now taking an elevator with a rated load of 1000kg as an example, when the mass of the car added for the second time is 400kg, the weight on both sides of the actual traction sheave is the same, i.e., a balanced state is achieved, the angular acceleration ω is equal 2 Is 0, after substituting the formula, k = m is obtained 0 *g/G Rated value Exactly 400/1000=0.4, the formula is validated.
2. If the real balance coefficient is 0, the angular acceleration omega of the traction wheel after releasing the brake when the car is unloaded for the first time 1 And is 0, and no matter what value the angular acceleration of the second time is, the balance coefficient obtained from the formula is 0, and the formula can also be verified.
It should be noted that the protection scope of the present invention is not limited to the above specific examples, and the object of the present invention can be achieved by substantially the same structure according to the basic technical concept of the present invention, and embodiments that can be imagined by those skilled in the art without creative efforts belong to the protection scope of the present invention.
Claims (2)
1. A method for detecting the balance coefficient of the elevator with a synchronous main machine in a machine room is characterized by comprising the following steps,
A. the flexible coupling is connected with the angular speed tester;
B. when the elevator car and the counterweight are at the same horizontal position, the power supply of the elevator is disconnected, and the brake is opened;
C. measuring and recording the average angular acceleration of the traction sheave in the initial short time, repeating the process after the lift car is added with a certain load, and measuring and recording the average angular acceleration of the traction sheave for the second time;
D. calculating a balance coefficient;
the balance coefficient is
ris the radius of the traction sheave;
g is a gravitational acceleration constant;
G rated value Is the weight force to which the nominal load capacity of the elevator is subjected.
2. The method for detecting the balance coefficient of the synchronous main frame elevator according to claim 1, wherein the flexible coupling is fixed on an axle center outside the ferromagnetic traction sheave through a permanent magnet and a bracket;
when the elevator has star-sealing protection, the star-sealing protection contactor is disconnected, the brake is opened, and star-sealing protection action is avoided.
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| CN202111191969.8A CN113830637B (en) | 2021-10-13 | 2021-10-13 | Method for detecting balance coefficient of synchronous main machine elevator |
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| CN101226096A (en) * | 2008-02-02 | 2008-07-23 | 王健 | Method for measuring torsion of elevator balancing coefficient as well as test device thereof |
| US9963323B2 (en) * | 2012-05-22 | 2018-05-08 | Tianjin Haoya Technology Development Co., Ltd. | Elevator balance coefficient detection method and device |
| CN103145015B (en) * | 2013-01-30 | 2015-09-30 | 深圳市海浦蒙特科技有限公司 | The method of inspection of balance coefficient of elevator |
| CN105565101B (en) * | 2016-02-29 | 2017-10-13 | 大连光程光电科技有限公司 | A kind of balance coefficient of elevator detection means and method |
| CN107673150A (en) * | 2017-09-30 | 2018-02-09 | 苏州博量电梯科技有限公司 | Balance coefficient of elevator detection means and method |
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