JP3799663B2 - Vending machine abnormality detection device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an abnormality detection device for a vending machine having a motor for a product carry-out mechanism.
[0002]
[Prior art]
As a vending machine that sells paper-packed beverages, there is a vending machine that alternately discharges the same product from a pair of parallel product storage columns.
FIG. 3 is a diagram illustrating a merchandise carry-out mechanism of the vending machine, in which FIG. 3 (a) is a view from the side, and FIG. 3 (b) is a view from the bottom. In FIG. 3, 20 is a cam plate, 21 and 22 are flappers, 23 and 24 are support shafts of the flappers 21 and 22, 25 is a drive shaft, 26 is a stopper, and C1 to Cn are products such as paper pack beverages.
[0003]
The flappers 21 and 22 are pivotable up and down about the support shafts 23 and 24 so as to be opened and closed. The opening and closing operations thereof are performed by the cam plate 20. The cam plate 20 is rotated by a drive shaft 25 and a column motor (not shown) provided at the upper end thereof. FIG. 3 shows a state in which the cam plate 20 is rotated and one flapper 22 is supported from below and held in a closed state, and the other flapper 21 is not supported and is opened downward. Since the flapper 21 is open in this manner, the lowermost product C1 of the right product storage column falls and is transported to the product outlet by a product transport conveyor (not shown) below the product C1. However, product C ₃ above it does not fall is held while being pressed against the wall surface of the commodity storage column by a stopper 26. The products C2 to Cm stored in the left product storage column are supported by the closed flapper 22 and held in the product storage column.
[0004]
In this state, when the next product sales command is issued, the column motor starts operation, and the drive shaft 25 and the cam plate 20 start to rotate so as to make a half rotation. When the cam plate 20 is rotated to a position where it is removed from the left flapper 22, the flapper 22 opens downward by its own weight, and the product C2 falls. At that time, the stopper 26 also rotates to hold the product on the product C2. On the other hand, in the right product storage column, the stopper 26 is removed, but the flapper 21 is lifted to the horizontal position by the rotating cam plate 20, and the product is held as it is.
[0005]
By repeating such an operation, the products in the left and right product storage columns are alternately carried out. While performing such an operation, when the flapper 21 or 22 opened downward is lifted up, The product may get caught in the fallen product and be locked. When this happens, the cam plate 20 stops moving, and the column motor that drives the drive shaft 25 becomes overloaded, causing overcurrent to flow and overheating. Further, since the column motor is driven with a high torque, there is a possibility that the mechanism portions such as the cam plate 20 and the flapper 21 or 22 are deformed.
[0006]
Therefore, conventionally, the current of the column motor is always detected, and when the current exceeds a reference value, the motor is stopped and an alarm lamp notifies the occurrence of an abnormality.
[0007]
[Problems to be solved by the invention]
However, since the motor operating current varies depending on the type of motor and the sales mechanism, in the conventional technology described above, the reference value for determining whether or not the current is abnormal is the value of the motor type or the sales mechanism. Depending on the difference, there was a problem that it was necessary to set each time and it took time and effort. In addition, even in the same model, the motor current varies somewhat for each individual vending machine, but the conventional technique has a problem that such variation cannot be dealt with.
[0008]
The present invention solves such a problem, makes it possible to set an abnormal current detection reference value for various types of motors and sales mechanisms without trouble, and for each individual vending machine. It is an object to set an optimal reference value for each.
[0009]
[Means for Solving the Problems]
In order to solve the above problems, in the abnormality detection device for a vending machine according to the present invention, current detection means for detecting a current of a motor for operating a merchandise sales mechanism, and a motor current at normal time are taken in from the current detector and stored. Normal current storage means, and operating current storage means for taking in and storing the motor current at the time of product sales from the current detector as needed, and the operating current storage means for the current value stored in the normal current storage means An abnormality is detected based on the fact that the ratio of the current values stored in is higher than a predetermined value.
[0010]
When the ratio of the current value stored in the operating current storage means to the current value stored in the normal current storage means is equal to or greater than a first predetermined value, a first abnormality signal is output, The second abnormality signal is output when the second predetermined value is greater than or equal to the first predetermined value.
Further, the abnormality is determined on the condition that the ratio of the current value stored in the operating current storage means to the current value stored in the normal current storage means has exceeded a predetermined value for a predetermined time or longer. Detected.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a block diagram of the control device. The control device 1 has a CPU (Central Processing Unit), thereby a product transport mechanism (not shown) including a column motor 2 for operating the cam plate 20 (FIG. 3), a product carry-out conveyor, and the like. ) Is controlled. The carrier switch 5 is provided to face a cam (not shown) attached to the upper portion of the drive shaft 25 (FIG. 3), and detects the rotational position of the drive shaft 25 every 90 degrees.
[0012]
The motor current detector 3 is provided in the power supply circuit of the column motor 2 and detects the motor current. The normal current storage unit 11 captures and stores the normal motor current from the motor current detector 3. The operating current storage unit 12 takes in the motor current at the time of sale from the motor current detector 3 and stores it. The operating time counting unit 13 starts measuring time when the ratio of the current value stored in the operating current storage unit 12 to the current value stored in the normal current storage unit 11 becomes equal to or greater than a predetermined value. When the measured time reaches a predetermined value, the control device 1 notifies the occurrence of an abnormality by the alarm lamp 6. At that time, the administrator of the vending machine can know the content of the abnormality by displaying a failure code on the display (same as above) by pressing a predetermined key (not shown). The operation time counting unit 13 notifies the occurrence of an abnormality after counting the predetermined time after the ratio of the current values becomes equal to or higher than the predetermined value, when the motor is activated or the product is locked for a moment. This is to prevent malfunction due to an excessive current that flows when a state is reached.
[0013]
Next, the operation of this abnormality detection device will be described.
FIG. 2 is a flowchart of the abnormality detection process.
Step 1: It is determined whether or not there is a sale.
Step 2: If there is, it is determined whether or not it is a test sale for detecting a normal current.
[0014]
Step 3 ... If it is a test sale, the current value flowing through the column motor 2 at that time is detected by the motor current detector 3.
Step 4: The detected current value I _N is stored in the normal current storage unit 11 as a normal reference current value.
[0015]
Step 5... If step 2 is not a test sale, the motor current detector 3 detects the current value flowing through the column motor 2 at that time.
Step 6: The detected current value I _C is stored in the operating current storage unit 12.
Step 7: A ratio of the current value I _{C to} the current value I _N is calculated and obtained.
Step 8: It is determined whether or not the ratio of the current value I _C to the current value I _N is greater than a predetermined value K greater than 1.
[0016]
Step 9... Is greater than the predetermined value K, the operation time of the column motor 2 is counted by the operation time counter 13.
Step 10: It is determined whether or not the operation time counted by the operation time counting unit 13 has exceeded a predetermined time.
Step 11: When the predetermined time has elapsed, it is determined that an abnormality has occurred in the apparatus, the column motor 2 is stopped, and the alarm lamp 6 is lit to notify that a failure has occurred.
[0017]
In the above embodiment, when the ratio of the current value I _C to the current value I _N is greater than the predetermined value K and continues for a certain period of time, the occurrence of abnormality is displayed immediately. Another predetermined value smaller than the predetermined value K may be provided, and when the predetermined value is exceeded for a certain period of time, a notice of occurrence of abnormality may be displayed. By doing so, it becomes possible to predict the column motor 2 before it is completely locked.
[0018]
【The invention's effect】
As described above, according to the abnormality detection device of the vending machine of the present invention, the abnormality is detected based on the current value actually measured at the time of normality. However, the vending machine can automatically set the reference value even if the motor current varies among individual vending machines of the same model.
[0019]
Further, if a first predetermined value and a second predetermined value larger than the first predetermined value are provided and the abnormality detection signal is output by the second predetermined value, the abnormality warning signal is output by the first predetermined value. It becomes possible to foresee the motor before it is fully locked. Furthermore, if an abnormality is detected on the condition that the excessive current has continued for a predetermined time or more, erroneous detection due to the excessive current flowing when the motor is started or when the product is locked for a moment is prevented. can do.
[Brief description of the drawings]
[Fig. 1] Block diagram of control device [Fig. 2] Flow chart of abnormality detection processing [Fig.
DESCRIPTION OF SYMBOLS 1 Control apparatus 2 Column motor 3 Motor current detector 4 Conveyance motor 5 Carrier switch 11 Normal current memory | storage part 12 Operation | movement current memory | storage part 13 Operation | movement time counting part 20 Cam board 21, 22 Flapper 23, 24 Support shaft 25 Drive shaft 26 Stopper

Claims (3)

Current detection means for detecting the current of the motor for operating the merchandise sales mechanism, normal current storage means for taking in and storing the motor current at the normal time from the current detector, and the current detector for the motor current at the time of merchandise sales as needed Operating current storage means for capturing and storing from
A vending machine for detecting an abnormality based on a ratio of a current value stored in the operating current storage means to a current value stored in the normal current storage means becoming a predetermined value or more. Anomaly detection device. When the ratio of the current value stored in the operating current storage means to the current value stored in the normal current storage means exceeds a first predetermined value, a first abnormality signal is output, and the first abnormality signal is output. 2. The abnormality detection device for a vending machine according to claim 1, wherein a second abnormality signal is output when the second abnormality value is greater than or equal to a predetermined value greater than the predetermined value. Abnormality is detected on condition that the ratio of the current value stored in the operating current storage means to the current value stored in the normal current storage means has exceeded a predetermined value for a predetermined time or longer. The abnormality detection device for a vending machine according to claim 1 or 2.

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