JP2005060074A - Automatic load factor control system for elevator and its method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To automatically correct load detection and eliminate control work by a maintenance person in an elevator which performs preliminary excitation to balance loads of a cage and a counterweight before releasing a brake at the startup of the elevator operation. <P>SOLUTION: The automatic load factor control system is provided with a load detecting section 11 for detecting a cage load, an initial-shock detecting portion 12 for detecting an initial shock, e.g. amount of the cage movement, caused in an interval from the brake release to the elevator operation started in response to a command from a speed command section 16; a load factor correction value computing portion 13 for obtaining the load factor correction value based on the magnitude of the initial shock detected by the initial shock detecting section 12; an adding section 13a for adding the output of the computing portion13 to the output of the load detecting section 11; a preliminary excitation torque amount computing section 14 for computing the amount of the preliminary excitation torque based on the output of adding portion 13a ( the amount of detected load which is corrected by the load factor correction value). <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an elevator load factor automatic adjustment device and a load factor automatic adjustment method in which suspension control is performed by pre-exciting an elevator driving motor at the start of elevator travel in order to balance the car and the counterweight. .

  In general, for example, in a slewing type (traction type) elevator as shown in FIG. 3, suspension control for balancing the car 1 and the counterweight 2 is performed. In FIG. 3, the rope 3 includes pulleys 1 a and 1 b attached to the lower end of the car 1, sheaves 4 a and 4 b provided at the upper part of the hoistway, a drive sheave 5 provided in the lowermost floor pit, and a counterweight 2. The sheaves 4c attached to the upper end are respectively hung in a sliding manner, and both ends are fixed to the upper part of the hoistway.

  A load cell 6 is attached to the dead end hitch of the rope 3 and performs load detection. Reference numeral 7 denotes a traveling cable as an electrical communication line between a control panel (not shown) and the car 1.

  The drive sheave 5 is connected to an elevator driving motor (not shown), and the car 1 moves up and down while being weight-balanced with the counterweight 2 by driving the motor.

  In the apparatus configured as described above, since a balanced state is normally obtained when a load of 50% is loaded in the car 1, when the car 1 is not loaded, the drive sheave 5 At the left and right (points A and B), the left side becomes lighter, so that the car 1 is pulled up to the right side when the brake is released to start running, and the car 1 instantaneously moves up (start shock).

  In order to prevent such an operation, pre-excitation is performed by supplying a current (bias torque) to the motor connected to the drive sheave 5 before releasing the brake. At this time, the pre-excitation is performed by calculating the torque applied to the motor shaft, which varies depending on the detected loading load in the car 1, thereby reducing the start shock when the brake is released.

Usually, when the load in the car is 50%, the load applied to both sides of the motor shaft is balanced, and the difference from 50% is used as the pre-excitation torque with the difference from the imbalance. That is, the amount of pre-excitation torque is
Pre-excitation torque amount = α × (detection load−balance load) (1)
Is required.

  Here, α in the equation (1) is a constant determined by settings such as the type of machine and the load capacity, and the balance load is usually 50% of the load capacity.

  From the above, in order to determine the amount of pre-excitation torque when the brake is released, it is important to correctly detect the load in the car.

In the elevator apparatus, in order to reduce the load adjustment work by the maintenance coordinator, for example, the invention described in Patent Document 1 below has been proposed.
JP 2000-26032 A

  However, since the load in the car is detected by a load cell attached to the under floor of the car or the hitch part of the rope, there is a difference in detection due to the season and aging. Further, when the pre-excitation torque amount of the equation (1) is calculated only from the detected load in the car, a start shock may occur due to imbalance due to a rope or traveling cable depending on the stop position.

  For example, in the elevator of FIG. 3, the load is detected by the load cell 6 attached to the dead end hitch of the rope 3. For this reason, the load applied to the load cell 6 changes by the weight of the rope 3 and the traveling cable 7 when the lowermost floor is stopped (broken line) and when the uppermost floor is stopped (solid line).

  In high-speed models, load detection is performed with a load cell attached to the bottom of the car, but the competition rope (balanced rope) is hitch under the car. The frame under the car may be distorted and the detected load may be smaller than the actual load.

  As an actual problem, the load detection value may change by 20 to 30% depending on the stop position of the car. In such a case, since the imbalance amount used for the preliminary excitation described above also changes, it becomes a shock at the start and the ride comfort is deteriorated.

  If a start shock that is uncomfortable in this way occurs, a callback (request for response from the customer to the failure, etc.) occurs, or maintenance personnel bring test weights to the site and readjust the load. End up.

  The present invention solves the above-described problems, and provides an elevator load factor automatic adjustment device and a load factor automatic adjustment method that can automatically correct load detection and do not require adjustment work by maintenance personnel. With the goal.

  In order to achieve the above object, an elevator load factor automatic adjusting device according to the present invention is an elevator that performs pre-excitation for balancing the load of a car and a counterweight before releasing a brake at the start of elevator travel. Load detecting means for detecting the load of the pre-excitation, pre-excitation torque amount calculating means for calculating the pre-excitation torque amount of the pre-excitation based on the load detected by the load detection means, speed command after releasing the brake A start shock detecting means for detecting a car start shock that occurs in a period until the start of traveling by the vehicle, a load factor correction value is obtained based on the magnitude of the start shock detected by the start shock detecting means, and the correction Load factor correction means for correcting the load detection amount by value It is characterized by a door.

  Further, the start shock detecting means detects the start shock based on a moving amount of the car.

  Further, the start shock detecting means detects the start shock based on the acceleration of the car.

  Further, the present invention is characterized by comprising warning means for issuing a warning when the load factor correction value obtained by the load factor correction means exceeds a predetermined value.

  Also, the elevator load factor automatic adjustment method of the present invention detects the load of the car in an elevator that performs pre-excitation for balancing the load of the car and the counterweight before releasing the brake at the start of the elevator travel. A step of calculating a pre-excitation torque amount of the pre-excitation based on the detected load, and a car start shock that occurs during a period from when the brake is released to when the speed command is started. A step of detecting, a step of calculating a load factor correction value based on the magnitude of the detected start shock, and a step of correcting the load detection amount of the car by the calculated load factor correction value. It is characterized by that.

  Further, the present invention is characterized in that a step of issuing a warning when the calculated load factor correction value exceeds a predetermined value is provided.

  When the elevator starts to run, the balance of the car and the counterweight is balanced, so that the elevator driving motor is pre-excited and the suspension control is performed before the brake is released.

  The pre-excitation torque amount is calculated and determined based on the load detected by the load detecting means. Therefore, if the load detection amount is correct, the car does not move up or down due to the suspension with the counterweight when the brake is released.

  However, the detection load when the same weight is loaded changes due to seasonal conditions and aging, or the weight of the rope and traveling cable changes when the top floor is stopped and when the bottom floor is stopped. If it changes, the above-mentioned suspension cannot be taken when the brake is released, and the car moves up or down during the period until the start of traveling by the speed command, and a start shock occurs.

  That is, for example, when the load in the car is 50% or less, the pre-excitation is insufficient when the car moves upward, and conversely, the pre-excitation is excessive when the car moves downward.

  In the present invention, the start shock detecting means detects the magnitude of the start shock, for example, the moving amount of the car, the moving speed of the car, or the acceleration of the car. Then, the load factor correction means obtains a load factor correction value based on the magnitude of the start shock, and corrects the load detection amount by the correction value.

  That is, for example, when the load in the car is 50% or less, in the case of a start shock in which the car moves upward, correction for reducing the load detection amount is performed. For this reason, the amount of pre-excitation torque calculated is also corrected to an amount that compensates for the shortage, and subsequent pre-excitation is performed appropriately, and the occurrence of a start shock can be prevented.

  Further, for example, when the load in the car is 50% or less, in the case of a start shock in which the car moves downward, correction is performed to increase the load detection amount. For this reason, the amount of pre-excitation torque calculated is also corrected to an amount that reduces the excess, and subsequent pre-excitation is performed appropriately, and the occurrence of a start shock can be prevented.

  As a result, it is possible to prevent the ride comfort from being reduced, and it is not necessary for the maintenance personnel to bring test weights to the site and readjust the load.

  Further, when the calculated load factor correction value exceeds a predetermined value, a warning is issued to ensure the safety of the system.

(1) According to the inventions described in claims 1 to 6, since the load factor necessary for the pre-excitation can be automatically corrected, it is possible to prevent the ride comfort of the elevator and prevent the callback from occurring. And maintenance personnel need not bring test weights to the site and readjust the load.
(2) According to the inventions of claims 4 and 6, a warning is issued when the calculated load factor correction value exceeds a predetermined value, so that the safety of the system is ensured.

  Hereinafter, an embodiment of an elevator load factor automatic adjusting apparatus according to the present invention will be described in detail with reference to the drawings. FIG. 1 shows an embodiment in which the present invention is applied to the elevator apparatus shown in FIG.

  In FIG. 1, reference numeral 10 denotes a position / speed detection unit that detects the position and traveling speed of the car 1, and its output signal is introduced into the start shock detection unit 12 and the speed command unit 16.

  A load detection unit 11 detects the load of the car 1. For example, a load cell 6 attached to the dead end hitch of the rope 3 in FIG. 3 or the lower part of the car 1 is used.

  12 detects a start shock that occurs when the brake is released, that is, the amount of movement and acceleration of the car 1 from when the brake is released to when the vehicle starts running according to the speed command, based on signals from the position / speed detector 10. This is a start shock detector.

  The start shock detection unit 12 uses the detection signal because the control software of the control device of the elevator apparatus constantly monitors the current position of the car 1 by, for example, the position / speed detection unit 10 (PVT encoder or the like). The amount of movement of the car 1 is detected.

  A load factor correction value calculator 13 calculates a load factor correction value for correcting the load detection amount of the load detector 11 based on the magnitude of the start shock detected by the start shock detector 12. is there.

  Reference numeral 14 denotes a preliminary excitation torque amount calculation unit that calculates the above-described equation (1) based on the load detection amount of the load detection unit 11 to obtain the preliminary excitation torque amount.

  Since the balance load of the equation (1) is determined on the drive device side as 50%, for example, in the present invention, the detected start shock is detected in order to correct the detected load (load detection amount) of the equation (1). The load factor correction value based on the magnitude (the output of the load factor correction value calculation unit 13) is added to the output of the load detection unit 11 by the addition unit 13a.

  For example, when the start shock detection unit 12 detects a start shock in which the car 1 has moved upward (a state in which pre-excitation is insufficient), the load factor correction value calculation unit 13 reduces the detected load. A value (for example, a negative polarity correction value) is calculated and output.

  For this reason, the detection load output from the load detection unit 11 is subtracted in the addition unit 13a, whereby the preliminary excitation torque amount calculation unit 14 calculates the equation (1) and outputs a larger preliminary excitation torque.

  Conversely, when the start shock detection unit 12 detects a start shock in which the car 1 has moved downward (a state in which pre-excitation is excessive), the load factor correction value calculation unit 13 increases the detection load. A correction value (for example, a positive polarity correction value) is calculated and output.

  For this reason, in the addition unit 13a, the detection load output from the load detection unit 11 is increased, whereby the preliminary excitation torque amount calculation unit 14 calculates the equation (1) and outputs a smaller preliminary excitation torque.

  15 drives and controls the motor M for driving the elevator (motor connected to the drive sheave 5 in FIG. 3) according to the preliminary excitation torque amount of the preliminary excitation torque amount calculation unit 14 before releasing the brake at the start of the elevator travel. The motor control unit drives and controls the motor M by a speed command signal from the speed command unit 16 after the brake is released.

When the start shock detection unit 12 detects the amount of movement S of the car from when the brake is released until the speed command is no longer 0 (until traveling by the speed command is started), for the preliminary excitation calculation obtained by the correction Load data (detection load of the above equation (1)) L is:
L = L _D + β · S (2)
It becomes. Here, L _D is detection data of the load detection unit 11, and β is a coefficient that varies depending on the status of each elevator (machine type, load capacity, etc.).

Further, when the start shock detection unit 12 detects the acceleration A of the car from when the brake is released until the speed command is not zero (until traveling by the speed command is started), the load data L is
L = L _D + γ · A (3)
It is good. Here, γ is a coefficient that varies depending on the status of each elevator (machine type, load capacity, etc.). In such a case, the start shock can be reliably detected by providing an acceleration sensor in the car without using a normal position / speed detection device.

  Each calculation of the load factor correction value calculation unit 13, the addition unit 13a, and the pre-excitation torque amount calculation unit 14 is performed by, for example, a computer (not shown) of an elevator control device.

Next, the operation of the apparatus configured as described above will be described with reference to the flowchart of FIG. First, in step S _1, to determine the coefficient of the load detection during the adjustment. In step S _2, to determine the detection load of the door of the car 1 is fully closed.

In step S _3, that imbalance amount calculating a pre-excitation torque amount from (difference between the detected load and balance load) (wherein (1) calculating the equation). In step S _4, after opening the brake while performing the pre-excitation in the computed pre-excitation torque amount, and starts running by the speed command.

In step S _5, it determines to detect whether the start shock period from opening the brake to travel by the speed command is started (the machine begins to rotate) has occurred. As a result, in the case of no start shock returns to the step S _2.

In step S ₆ in the case of there start shock, calculated imbalance excess or deficiency (i.e. load factor correction value corresponding to the magnitude of the start shock) at a load factor correction value calculation unit 13 of FIG. 1,該荷heavy Factor after correcting the load factor by adding the correction value to the addition unit 13a, the flow returns to step S _2.

  During normal running as described above, for example, if a load of 20% is detected in the car 1, the balance is generally achieved with a load of 50%. When the torque amount calculation unit 14 calculates the equation (1), 30% of pre-excitation is applied to the car 1 side when the brake is released.

  However, if the detected load changes when the same load is loaded due to seasonal conditions or changes over time, or if the detected load changes even when the same load is loaded up and down the hoistway due to roping, etc., the balance will be reduced when the brake is released. Instead, the car 1 moves up or down.

For example, when the car 1 is moved upward in a state in which pre-excitation is not enough, and adjust the factor for detecting the load in step S ₆ in this case 2, the detection load in if it was the same detection value Lower than 20%, a large pre-excitation torque is output.

When Matakago 1 has moved downward in a state pre-excitation is too large, by adjusting the factor for detecting the load in step S ₆ in this case 2, the detection load in if it was the same detection value It is higher than the 20%, and a small pre-excitation torque is output.

  As for the start shock when the brake is released, it is possible to estimate the excess or deficiency of the excitation torque to some extent even if only the car movement amount is considered as in the previous embodiment, but this is not restrictive, and the movement speed and acceleration of the car can be estimated. You can monitor in more detail by looking.

  Further, a warning may be issued when the correction amount (load factor correction value) exceeds a predetermined value. In such a configuration, the safety of the system is ensured.

  As described above, according to the present embodiment, after the start shock is detected, the detected load amount necessary for obtaining the pre-excitation torque amount is automatically corrected, and thereafter, the pre-excitation torque amount is appropriately corrected. Excitation can be performed.

  This eliminates the need for maintenance personnel to readjust the load using test weights.

  Further, as an embodiment of the elevator load factor automatic adjustment method of the present invention, the following processing is executed as in the sequence of FIG. That is, the step of detecting the load of the car 1 by, for example, the load cell 6, the step of calculating the amount of pre-excitation torque based on the detected load, for example, by the equation (1), and releasing the brake, The step of detecting the start shock of the car 1 generated during the period until the start of the speed command starts, for example, by monitoring the amount of movement of the car, and the load factor correction value based on the magnitude of the detected start shock. And a step of correcting the load detection amount of the car 1 by the calculated load factor correction value.

  A step of issuing a warning when the calculated load factor correction value exceeds a predetermined value is executed.

  As described above, according to the present embodiment, after the start shock is detected, the detected load amount necessary for obtaining the pre-excitation torque amount is automatically corrected, and thereafter, the pre-excitation torque amount is appropriately corrected. Excitation can be performed.

  This eliminates the need for maintenance personnel to readjust the load using test weights.

  The present invention is not limited to the elevator apparatus shown in FIG. 3, but can be applied to other elevator apparatuses in which preliminary excitation is performed.

The principal part block diagram of one Example of this invention. The flowchart showing one Example of this invention and showing the sequence at the time of normal driving | running | working. The block diagram which shows an example of the elevator apparatus with which this invention is applied.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Car 2 ... Counterweight 3 ... Rope 4a, 4b, 4c ... Sheave 5 ... Drive sheave 6 ... Load cell 7 ... Traveling cable 10 ... Position / speed detection part 11 ... Load detection part 12 ... Start shock detection part 13 ... Load factor Correction value calculation unit 13a ... Addition unit 14 ... Pre-excitation torque amount calculation unit 15 ... Motor control unit 16 ... Speed command unit M ... Motor

Claims (6)

In the elevator that performs pre-excitation to balance the load of the car and the counterweight before releasing the brake when the elevator starts running,
Load detecting means for detecting the load of the car;
Preliminary excitation torque amount calculation means for calculating the preliminary excitation torque amount of the preliminary excitation based on the load detected by the load detection means;
Start shock detecting means for detecting a start shock of a car that occurs in a period from when the brake is released to when traveling by a speed command is started;
An elevator comprising: a load factor correction value that obtains a load factor correction value based on a magnitude of the start shock detected by the start shock detection means, and corrects the load detection amount based on the correction value. Load factor automatic adjustment device.   2. The elevator load factor automatic adjusting device according to claim 1, wherein the start shock detecting means detects the start shock based on a moving amount of a car.   2. The elevator load factor automatic adjusting device according to claim 1, wherein the start shock detecting means detects the start shock based on an acceleration of a car.   The elevator load factor automatic adjustment device according to claim 1, further comprising warning means for issuing a warning when the load factor correction value obtained by the load factor correction means exceeds a predetermined value. In the elevator that performs pre-excitation to balance the load of the car and the counterweight before releasing the brake when the elevator starts running,
Detecting the load of the car;
Calculating a pre-excitation torque amount of the pre-excitation based on the detected load;
A step of detecting a car start shock that occurs during a period from when the brake is released to when the speed command starts running;
Calculating a load factor correction value based on the magnitude of the detected start shock;
An elevator load factor automatic adjustment method comprising: a step of correcting a load detection amount of the car with the calculated load factor correction value. 6. The elevator load factor automatic adjustment method according to claim 5, further comprising a step of issuing a warning when the calculated load factor correction value exceeds a predetermined value.

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