JPH09215370A - Controller of battery powered ceiling running truck - Google Patents

Abstract

PROBLEM TO BE SOLVED: To continue the operation of a battery powered ceiling running trucks which has the ceiling running truck main part which runs along a rail, a loader which is hung from the main part with a belt and a motor by which the belt is supplied and taken up in order to make the loader ascend and descend with out an error stop even if a whole work weight including the loader exceeds a rated weight limit. SOLUTION: At the time of loading, a motor current for supplying/taking up a belt is detected (step S1 ). The average value of the detected current is converted into a work weight (step S2 ). Then it is judged whether the work weight (α) exceeds a rated weight or not (step S3 ). If the work weight (α) is smaller than the rated weight, the motor is controlled in a constant speed mode (step S4 ). If the work weight (α) is larger than the rated weight, the motor is controlled in a constant current mode (step S5 ).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a battery-operated overhead traveling vehicle control device for controlling the lifting and lowering of a transfer machine suspended by a belt on a main body of an overhead traveling vehicle traveling along a rail.

[0002]

2. Description of the Related Art Generally, a battery-operated overhead traveling carriage is shown in FIG.
It is configured as follows. In FIG. 2, reference numeral 1 denotes a rail 2 provided with a traveling drive motor and provided near the ceiling in the building.
It is a main body of an overhead traveling carriage that travels along. A transfer machine 4 for suspending a conveyed product is suspended from the main body 1 via a belt 3. The up-and-down drive of the transfer machine 4 is performed by unwinding a belt provided in the main body 1, a motor and an unwinding motor for winding up, and winding up or winding up the belt 3 by a winding reel (not shown).

In the current battery-type overhead traveling carriage, the transfer machine 4 is moved up and down by speed control when transferring. If the workpiece is transferred over the rating, the target speed will not be reached, and the motor current value will exceed the allowable value.

[0004]

In a battery-operated overhead traveling carriage, when a work having a weight exceeding the rating is transferred, an error stop occurs because the motor current for feeding the belt and winding exceeds the allowable value when the transfer machine rises. Will end up. Alternatively, even if the current is below the limit, if the set speed is too fast, speed control cannot be performed, resulting in a situation where the speed decreases.

The present invention has been made in view of the above points, and an object thereof is to continuously operate without moving even if the weight of a work including a transfer machine exceeds a rated limit when transferring the work. Another object of the present invention is to provide a control device for a battery-operated overhead traveling carriage.

[0006]

According to the present invention, there is provided a main body of an overhead traveling carriage which travels along a rail, a transfer machine suspended from the main body via a belt, and a feeding-out of the belt.
In a control device for a battery-operated overhead traveling carriage equipped with a motor for hoisting and raising and lowering a transfer machine, (1) a current detection unit for detecting a current flowing through the motor and a detection current for the current detection unit as a work. When the weight conversion unit for converting to weight and the work weight converted by the weight conversion unit is less than a predetermined set weight, a constant speed control of the motor is performed, and the converted work weight is a predetermined set weight or more. And a control unit for performing constant current control of the motor, (2) the weight conversion unit performs conversion using an average value of the detected currents of the current detection unit. (3) The predetermined set weight is set to a rated weight.

(4) The weight conversion unit calculates the work weight from the motor current. If the work weight is less than the rated weight, the motor is subjected to normal constant speed control. If the work weight is more than the rated weight, the motor control is switched to the constant current control. Therefore, the motor current does not exceed the allowable value, and the error stop does not occur. This can prevent the line from being stopped.

[0008]

Embodiments of the present invention will be described below. The present invention is directed to a current detection unit that detects a current flowing through a motor that winds and winds a transfer device lifting and lowering belt, a weight conversion unit that converts the detection current of the detection unit into a work weight, and a conversion unit. A constant speed control of the motor when the calculated work weight is less than a predetermined set weight, and a constant current control of the motor when the converted work weight is a predetermined set weight or more; Was set up.

That is, according to the present invention, the current value of the motor for winding the belt and winding it at the time of transfer is detected by using the A / D, and the current value is converted into the weight of the workpiece being transferred (this weight is the transfer machine). Weight including 4). At this time, an average value is used as the current value. From this work weight, the original speed control is stopped when the rated weight is exceeded, and the current is switched to the constant current control for controlling the speed so as to be constant at a certain current value.

[0010]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a flow chart for implementing the present invention. At the time of transfer, first, the motor current for feeding the belt 3 and winding the belt 3 is detected (step S ₁ ). Next, using the average value of the detected current, it is converted into the work weight (step S ₂ ). Next, it is determined whether the converted work weight (α) is equal to or more than the rated weight (step S ₃ ). If the work weight (α) is less than the rated weight, the control of the motor is set to a constant speed control (step S ₄ ), and if the work weight (α) is the rated weight or more, the control of the motor is set to a constant current. Control (step S ₅ ). The above operation is performed periodically.

[0011]

As described above, according to the present invention, the current detecting section for detecting the current flowing through the motor for feeding and winding the belt for raising and lowering the transfer machine, and the detected current of the current detecting section are used as the work weight. When the work weight converted by the weight conversion unit and the work weight converted by the weight conversion unit is less than a predetermined set weight, constant speed control of the motor is performed, and the converted work weight is a predetermined set weight or more. In some cases, since the control unit for controlling the constant current of the motor is provided, the following excellent effects can be obtained.

(1) It is possible to reduce the line stop even if the work with the rated value is transferred. (2) The work weight can be roughly calculated, and control at the time of rating and control at the time of rating over can be separated.

[Brief description of drawings]

FIG. 1 is a flowchart showing an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a configuration of an overhead traveling carriage.

[Explanation of symbols]

 1 ... Main body of overhead traveling carriage 2 ... Rail 3 ... Belt 4 ... Transfer machine

Claims (3)

[Claims] 1. A main body of an overhead traveling carriage that travels along a rail, a transfer machine suspended from the main body via a belt, and a motor for raising and lowering the transfer machine by feeding and winding the belt. In a control device for a battery-operated overhead traveling carriage comprising: a current detection unit that detects a current flowing through the motor; a weight conversion unit that converts a detection current of the current detection unit into a work weight; and a weight conversion unit. When the converted work weight is less than a predetermined set weight, a constant speed control of the motor is performed, and when the converted work weight is a predetermined set weight or more, a constant current control of the motor is performed. A control device for a battery-operated overhead traveling vehicle, comprising: 2. The control device for a battery-operated overhead traveling vehicle according to claim 1, wherein the weight conversion unit performs conversion by using an average value of detected currents of the current detection unit. 3. The control device for a battery-operated overhead traveling vehicle according to claim 1, wherein the predetermined set weight is set to a rated weight.