JP2502189B2 - Elevator adjustment device - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to an elevator adjusting device for facilitating elevator installation work, particularly balancing weight weight adjustment work.

[Conventional technology]

As is known in Japanese Patent Laid-Open No. 2-204290, a cage type elevator has a car connected to one end of a main rope hung on a sheave and a counterweight connected to the other end. In this configuration, the weight of the counterweight is such that the weight on the car side (the weight of the car body and the passengers) and the weight on the counterweight side are balanced when approximately half the passengers in the car are in the car. Is set. This is to make the capacity and power consumption of the electric motor that drives the elevator and the control device that drives the electric motor efficient and economical.

The weight of the counterweight is adjusted when the elevator is installed. For this adjustment, the electric currents of the motors when the elevator is raised and lowered are measured, and the difference between the mutual current values approaches 0. The weight was increased or decreased.

[Problems to be Solved by the Invention]

As described above, the conventional elevator device increases or decreases the counterweight when adjusting the weight of the counterweight, and raises or lowers the elevator each time to reduce the difference in the motor current value during each operation to zero. It is checked whether or not it is approaching, and when the value deviates from zero, the increase and decrease of the weight and the raising and lowering of the elevator will be repeated again, which requires time and labor for the work, and it causes dangerous work. There was a point. Further, in recent years, induction motors have been used as elevator driving motors, and in the case of a low current frequency, there is a drawback that the lower limit of the frequency characteristics of the ammeter is exceeded and an accurate current value cannot be measured.

The present invention has been made in order to solve the above problems, and an elevator adjustment device that does not require an ammeter, is extremely safe, and can calculate an appropriate weight weight in a short time. The purpose is to get.

[Means for solving the problem]

An elevator adjusting apparatus according to the present invention includes an electric motor for driving an elevator car, a sheave connected to the electric motor for driving the car, and a basket and a counterweight suspended from the sheave via a main rope in a slipping manner. In an elevator system consisting of
A constant speed detection circuit for detecting the constant speed traveling of the elevator car, a current detector for detecting the current flowing to the electric motor, a direction detection means for detecting the traveling direction of the elevator car, and a car during the operation of the constant speed detection circuit. A current value storage means for storing the electric current value of the electric motor according to the traveling direction, and a weight calculation means for calculating the weight difference between the car and the counterweight from the difference between the stored current values during the car ascending operation and the car descending operation. And a control circuit having.

[Action]

The control circuit according to the present invention stores the electric current values of the respective motors during the elevator ascending operation and the elevator descending operation, calculates the weight difference between the cage and the counterweight from the difference between the stored current values, and calculates this weight difference. The weight of the counterweight is calculated in order to increase or decrease the current counterweight to eliminate it.

〔Example〕

An embodiment of the present invention will be described with reference to FIGS.

FIG. 1 is a block diagram showing a system outline of an embodiment of the present invention. In the figure, (1) is a drive induction motor, (2) is a sheave, (3) is a deflector, and (4) is a main rope. , (5) is a basket,
(6) is a counterweight, (7) is a speed detector such as a rotary encoder, (7a) is a speed detection signal which is its output, (8)
Is a current detector (8a) is the output current detection signal,
(9) is a control circuit, and (9a) is a voltage command which is its output,
(9b) is the weight signal which is also the output of the control circuit, (10)
Is a power converter such as an inverter, and (11) is a display such as a handy type computer.

FIG. 2 is a block diagram showing the configuration of the control circuit (9), in which (12) is a central processing unit (hereinafter referred to as CPU), (13).
Is a read-only memory (referred to as ROM), (14) is a readable / writable memory (hereinafter referred to as RAM), and (15) is analog /
Digital converter (denoted as A / D), (16) is a counter,
(17) is a digital / analog converter (hereinafter referred to as D / A), (18) is an interface (hereinafter referred to as I / F), (1
9) It's a bus.

FIG. 3 is a flow chart showing the operation of the control circuit (9) (S1).
~ (S6) is the procedure.

 Next, the operation will be described.

When the elevator is operated, a current flows through the electric motor (1) and the current detector (8) inputs the current detection signal (8a), that is, I _in to the control circuit (9) (procedure (S1)). Then, in steps (S2) to (S4), I
_UP or I _DN is set, and the torque current It _UP or It _DN
Is calculated. Here, the value of the torque current is obtained by I ₁ ² = I ₀ ² + It ² based on the vector control theory of the induction motor. Incidentally, I ₁ is the primary current of the electric motor (1), I ₀ is the exciting current, and It is the torque current.

In step (S5), the weight difference between the car (5) and the counterweight (6) is calculated from the difference between the torque currents It _UP and It _DN in the ascending and descending directions calculated as described above to eliminate the weight difference. Then, the weight Wu of the weight to be added to the counterweight (6) or reduced from the counterweight (6) is obtained.

In step (S5), Kt is a torque constant ([Kgm / A]) determined by the characteristics of the electric motor (1), and KL is a roping ratio of the main rope (4) (1: 1 in this embodiment, that is, "1"). Yes, KG is the reduction ratio between the electric motor (1) and the sheave (2) (in the present embodiment, there is no reduction gear, so it is "1"), and D is the diameter [m] of the sheave (2). .

The weight Wu calculated as described above is output to the display (11) in step (S6). That is, the load (equilibrium load) predetermined in the car (5) according to its rated load.
When loading and ascending / descending operation, the weight Wu of the weight to be added to the balance weight (6) or reduced from the balance weight (6) is displayed on the display (11). The unbalanced load can be known by looking at the displayed value.

〔The invention's effect〕

As described above, according to the present invention, the difference between the weight of the car and the weight of the counterweight is calculated based on the difference between the electric motor current values detected during the elevator ascending operation and the elevator descending operation. By increasing or decreasing the weight of the existing counterweight according to the difference in order to eliminate the problem, there is an effect that the counterweight can be easily adjusted to an appropriate weight in a short time.

[Brief description of drawings]

FIG. 1 is a system configuration diagram of an embodiment of the present invention, FIG. 2 is a block diagram showing a configuration of a control circuit (9), and FIG. 3 is a flow chart showing an operation of the control circuit (9). (1) is an electric motor, (2) is a sheave, (3) is a deflector,
(4) is the main rope, (5) is the cage, (6) is the counterweight, (7)
Is a speed detector, (8) is a current detector, and (9) is a control circuit. In the drawings, the same reference numerals indicate the same or corresponding parts.

Claims (1)

(57) [Claims] 1. An elevator system comprising an electric motor for driving an elevator car, a sheave connected to the electric motor for driving the car, and a cage and a counterweight suspended in a slipping manner on the sheave via main ropes. In, a constant speed detection circuit for detecting a constant speed traveling of the elevator car, a current detector for detecting a current flowing to the electric motor, a direction detection means for detecting a traveling direction of the elevator car, and an operation of the constant speed detection circuit A current value storage means that sometimes stores a motor current value according to the car traveling direction, and a weight that calculates the weight difference between the car and the counterweight from the difference between the current memory values during car up operation and car down operation An elevator adjusting apparatus, comprising: a control circuit having a calculating means.