JPH0136860Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an improvement of a control device for a winding drum type elevator.

In recent years, it has been proposed to use a drum-type elevator for a small, low-speed elevator with a short vertical stroke. This is shown in FIG.

In the figure, 1 is a three-phase induction motor, 2 is a worm driven by the motor 1, 3 is a worm gear that meshes with the worm 2, 4 is a winding drum connected to the worm gear 3, and 5 is a winding drum that is wound on the winding drum 4. 6 is a pulley pivotally connected to the ceiling 7 of the hoistway and around which the main rope 5 is wound; 8 is a car connected to one end of the main rope 5; 9, 10; This is a position detector attached to the cage 8 for commanding the start of deceleration.
9 is a position detector for ascending operation, and 10 is a position detector for descending operation. 11 and 12 are the first and second floors, respectively; 13 and 14 are cams that operate the position detectors 9 and 10, respectively; The cam 1 is placed in a position that activates the position detector 9 for upward operation when the cam 1 reaches the position.
Reference numerals 4 and 4 are respectively mounted at positions that activate position detectors 10 for descending operation when the car 8 comes to a position a predetermined distance A above the floor 11 on the first floor.

In such a configuration, when the brake (not shown) is released and the electric motor 1 is started during ascending operation, the winding drum 4 rotates via the worm 2 and the worm gear 3, and the main rope 5 is wound up. with this,
Car 8 runs in the upward direction. Then, when the car 8 travels in the upward direction from the first floor and reaches the position A in front of the floor 12 on the second floor, the position detector 9 for upward operation is detected.
operates to issue a deceleration command, power supply to the electric motor 1 is cut off, and the brake is activated to decelerate the car 8 and stop it on the second floor 12. Furthermore, when the electric motor 1 is started in the reverse direction during descending operation, the winding drum 4 also rotates in the reverse direction, the main rope 5 wound around the winding drum 4 is rewound, and the car 8 runs in the down direction. In addition, the car 8 runs in the downward direction from the second floor, and the first floor
When the car 8 reaches position A in front of the car, the position detector 10 for descending operation operates to issue a deceleration command, the power supply to the electric motor 1 is cut off, the brake is activated, the car 8 decelerates, and the car 8 decelerates to the first floor. It will stop on floor 11.

However, according to the above configuration, the load on the electric motor 1 during the upward operation and during the downward operation is different, and the load on the electric motor 1 is larger during the upward operation. That is, FIG. 2 shows the deceleration characteristics during ascending operation and descending operation. In the figure, V _U and V _D are the speed curves during ascending and descending operations, respectively, time T _O is the time point when the deceleration command is generated, and S _U and S _D are the area of the shaded area during ascending and descending operations, respectively. , that is, the travel distance until the car 8 stops after the deceleration command is issued. Therefore, the travel distance of the car 8 from when the car 8 starts decelerating in response to a deceleration command until it stops is shorter in the upward operation S _U than in the downward operation S _D. For this reason, if the brake torque is set so that the brake will land exactly on floor 12 during ascending operation, then during descending operation
On the other hand, if the brake torque is set so that the vehicle will land exactly on floor 11 during descending operation, it will stop before reaching floor 12 during upper floor operation. It was hot.

This invention is an attempt to eliminate the above-mentioned drawbacks and to provide a control device for a drum-type elevator in which the difference in deceleration and landing characteristics during ascending and descending operations is small.

An embodiment of this invention will be explained below with reference to FIG. In the figure, the same symbols as in FIG. 1 indicate the same parts.
In FIG. 3, the raising operation cam 13 is connected to the car 8
When the car 8 reaches a predetermined distance B below the floor 12 on the second floor, the cam 14 for the descending operation is placed in a position where the position detector 9 for the ascending operation is activated.
1, the position detector 10 for the downward operation is activated when the position detector 10 reaches a position above the predetermined distance C of 1. Note that distances B and C are the distances that the car 8 travels until it stops after the deceleration command is issued during ascending and descending operations, respectively, that is, S _{U and C} in FIG.
The distance is set to correspond to S _D , and there is a relationship of B<C. Therefore, it is possible to accurately land on the floors 11 and 12 both during the ascending operation and during the descending operation.

In addition, in FIGS. 1 to 3, the deceleration of the electric motor 1,
We have explained the case where stopping is simply done by cutting off the power supply to motor 1 and activating the brake, but when a pole number switching motor is used and the car is first switched to low speed in response to a deceleration command, when the car reaches a predetermined point near the floor. Even when the power supply to the motor is cut off and the brake is activated, the distance from the position where the deceleration command is generated to the floor where the stop is to be made is shorter during ascending operation than during descending operation. It is possible to prevent abnormally long low-speed running times during over-speed stopping and upward operation. In addition, when controlling the applied voltage and frequency of the electric motor 1 to control its deceleration and stop, and even when performing speed feedback control, deceleration and stoppage due to the difference in motor load between ascending and descending operations may occur. It goes without saying that differences in landing characteristics can be absorbed by changing the deceleration command generation position as described above.

As explained above, this invention has a winding drum driven by an induction motor, and the car is operated by winding or unwinding the main rope on this winding drum. Since the distance from the operating point of the position detector for deceleration start command to the stop floor is set shorter than that during descending operation, the difference in deceleration and landing characteristics during ascending operation and descending operation is minimized and the distance is always The extremely excellent effect of being able to obtain stable operating characteristics is obtained.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the configuration of a conventional control device for a winding drum elevator, FIG. 2 is an explanatory diagram of its operation, and FIG. 3 is a diagram showing an embodiment of the control device for a winding drum elevator according to the present invention. It is a figure equivalent figure. 1... Three-phase induction motor, 2... Worm, 3...
... Worm gear, 4 ... Winding barrel, 5 ... Main rope, 6 ...
...pulley, 7...ceiling, 8...basket, 9,10...
Position detector, 11, 12... Floor, 13, 14...
…cam. In addition, the same parts or corresponding parts in the figures are indicated by the same reference numerals.

Claims (1)

[Scope of utility model registration request] A hoisting drum driven by an induction motor is provided, and during ascending operation, the car is operated by winding the main rope onto the hoisting drum, and during descending operation, the main rope is wound back from the hoisting drum to operate the car. In a control device for a drum-type elevator, the distance from the deceleration start command position point to the stop floor during upward operation is the distance from the deceleration start command position point to the stop floor during downward operation. A control device for a winding drum type elevator, characterized in that the length is set to be shorter than .