JP3744307B2 - Beverage can discrimination method and can beverage induction heating device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an induction heating device for a can beverage of a vending machine that sells a can beverage such as coffee by electromagnetic induction heating.
[0002]
[Prior art]
As this type of conventional device, there is known a vending machine equipped with an induction heating device for a can beverage that inductively heats a can containing a beverage so that the beverage has a desired temperature in a short time. However, a beverage can is formed by forming a metal plate into a cylindrical shape and welding a seam or bonding with an adhesive. The can welded to the seam is a welded can, and the bonded can is an adhesive can. When such an adhesive can is induction-heated, it is known that a potential difference may be generated between the metals joined by the adhesive to generate an arc, or the can may be damaged by local heating.
[0003]
Therefore, there is a device disclosed in Japanese Patent Laid-Open No. 10-334336 as a conventional device that detects the type of can, that is, an adhesive can and performs appropriate induction heating control. In the invention disclosed in this publication, two search coils are arranged on both sides of an induction heated can, a parallel capacitor is connected to each search coil, and a resonance circuit is formed by the search coil and the parallel capacitor. A means for connecting the excitation circuit, resonating the search coil and the parallel capacitor, detecting the resonance frequency, and comparing the resonance frequencies of the two search coils is provided. If a difference occurs in the resonance frequency using the fact that the inductance of the search coil changes and the resonance frequency changes at a position facing the search coil, the can is determined to be an adhesive can, and the detection result Based on the type of can, induction heating control is performed.
[0004]
In addition, according to the publication, when induction heating the adhesive can, a method of heating the can in a forward and reverse direction so that the bonded portion is located away from the induction coil, and the rotation of the can in a fixed direction. A method is proposed in which the input of the induction coil is limited so that the bonded portion is heated slowly so as not to overheat locally.
[0005]
[Problems to be solved by the invention]
By the way, in the conventional configuration, there is a problem that the cost increases because the search coil, the excitation circuit, and the resonance frequency comparison means are used to detect the adhesive can. In the method of limiting the input of the induction coil, heating takes time. There's a problem.
The present invention has been made to solve the above-mentioned problems. The first object is to easily and reliably determine the type of beverage can, and the second object is equipment necessary for determining the type of can. An object of the present invention is to provide an induction heating apparatus for can beverages that can reduce the cost and the heating time.
[0006]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, an invention according to claim 1 is directed to an induction coil that induction-heats a beverage-containing can, an inverter that supplies electric power to the induction coil, a motor that rotationally drives a roller in contact with the can, and a can A can surface temperature sensor for measuring the surface temperature of the motor and an output of the can surface temperature sensor as inputs, and the inverter and a control means for controlling the rotation of the motor. The motor is driven by the control means. While rotating the can, the output of the inverter is set to a low output, the can is heated for a predetermined time, the output of the can surface temperature sensor is sampled within the time, the surface temperature of the can is measured, and the maximum value of the temperature is determined. The temperature difference with the average temperature is calculated, the temperature difference is compared with predetermined data, and based on the comparison result, it is determined whether it is an adhesive can or a can other than an adhesive can. To do.
[0007]
In order to heat the can uniformly when the can is heated by induction heating, and to improve the heat transfer from the can to the beverage, the can is rotated to uniformly heat the can. At the same time, it is effective to improve the heat transfer by stirring the beverage inside. As a method of rotating the can, generally, the can is rotated by putting the can sideways on the roller and rotating the roller. The induction coil is wound in a race track shape along the can body. However, when the can with the racetrack-shaped induction coil is heated with an adhesive, the eddy current flowing through the can is moved along the bond as shown in FIG. Then, the adhesive part indicated by the flow mesh is divided and heated up and down. When the bonded portion is moved away from the position facing the induction coil, the eddy current of the can flows along the surface of the can facing the induction coil, and heating that concentrates on the local portion does not occur. Therefore, when induction heating is performed while rotating the can, the temperature becomes high at the bonded portion as shown in FIG.
[0008]
From this, when heating the can with the above configuration, by heating to a level that does not damage even if the adhesive portion is locally overheated with low input, the adhesive can detects the high temperature portion and the low temperature portion, and the temperature difference is detected. It is possible to determine that the can is an adhesive can if it exceeds the value determined in advance as an adhesive can, and if the temperature difference does not exceed the value determined as an adhesive can, a welding can It becomes possible to judge that.
[0009]
In addition, as in the invention of claim 2, an induction coil for induction heating a can containing beverage, an inverter for supplying electric power to the induction coil, a motor for rotationally driving a roller in contact with the can, and a surface temperature of the can A can surface temperature sensor for measuring the output of the can and an output of the can surface temperature sensor as inputs, and the inverter and control means for controlling the rotation of the motor. The control means drives the motor to rotate the can. The inverter output is set to a low output, the can is heated for a predetermined time, the output of the can surface temperature sensor is sampled within the time, the surface temperature of the can is measured, and the maximum value and the average temperature of the temperature are calculated. The temperature difference is calculated, and the temperature difference is compared with predetermined data. Based on the comparison result, it is determined whether the can is an adhesive can or a can other than the adhesive can, and according to the type of the can. Cans with heating pattern It can be heated to the desired temperature.
[0010]
According to invention of Claim 2, it can heat appropriately according to the kind of drink can discriminated by using the discriminating method of Claim 1.
Further, as in the invention according to claim 3, in the induction heating apparatus for can beverage according to claim 2, the heating pattern after discrimination of the can determined to be an adhesive can is a vortex along the adhesion part of the can. During the period in which the current is concentrated, the inverter can be controlled to a low output, and the other parts can be formed by a combination of a high and low output that controls to a predetermined high output.
[0011]
With the above configuration, when the bonding portion of the bonding can passes through the position corresponding to the induction coil, the induction coil input is kept low so that the bonding portion does not overheat so that the bonding portion moves away from the position facing the induction coil. Therefore, it is possible to heat the portion 51 heated by the rotation of the can substantially uniformly without damaging the adhesive can.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a flowchart showing the heating procedure of the main part of the embodiment of the present invention, FIG. 2 is a block diagram of the apparatus of the present invention, FIG. 3 is a side view of FIG. 2, and FIG. The figure is shown. In FIG. 1 to FIG. 4, 1 is an induction coil that is arranged along a part of the body of a can 50 containing a beverage 5 and induction-heats the can 50, 2 is a roller that rotates the can 50, and 3 presses the can 50. Presser roller, 4 is a drive motor for the roller 2, 6 is an inverter for supplying power to the induction coil 1, 7 is a can surface temperature sensor for measuring the can surface temperature, and 8 is a shield for leakage of magnetic flux on the back surface of the induction coil 1. Ferrite core, 20 is a central control unit for automatically operating this apparatus, 21 receives the output signal of the can surface temperature sensor 7, detects the maximum temperature, calculates the average temperature, and calculates the maximum temperature and the average temperature. The difference is calculated and compared with the data of the discrimination database 24 inputted in advance, the type of the can is discriminated, and a comparison discriminating unit for detecting that the can has reached the desired temperature, 22 is a heating time with low input ,and A timer that backs up the heating time, 41 is a drive unit that performs variable speed drive of the motor 4, 42 is a control unit that sends a command to the drive unit 41, and 43 is a rotation number storage unit that stores the rotation number of the can 50. .
[0013]
As shown in FIGS. 2 and 3, the configuration of the induction heating device in this embodiment is such that the can 50 containing the beverage 5 is placed on the roller 2 driven by the drive motor 4 while being laid down sideways. 1 is wound in the shape of a race track along the body of the can and is supplied with a high-frequency current from the inverter 6 to induce an eddy current in the can to heat the can. During this heating, power is transmitted from the roller 2 to the can 50, the can 50 is rotating, and the can 50 is pressed by the presser roller 3 in order to eliminate slippage between the can 50 and the roller 2. The temperature of the can 50 during heating is detected by the can surface temperature sensor 7. Thus, by rotating the can 50 during heating, the heat input from the induction coil 1 to the can 50 can be made uniform.
[0014]
A heating procedure for heating the can 50 with the above configuration will be described with reference to the flowchart of FIG. 1 and the control block diagram of FIG. First, in step S1, the motor 4 is set to a low speed to rotate the can at a low speed, and in step S2, the output of the inverter 6 is set to a low output to input heat from the induction coil 1 to the can 50 with a low input. After the low input operation is continued for a predetermined time set by the timer 22, the temperature of the can is measured over the entire circumference by the can surface temperature sensor 7 in step S3, and 1 of the can 50 is measured by the comparison discrimination unit 21 in step S4. Sensing two or more points around the circumference, calculating the average temperature Tabe ° C and the maximum temperature Tmax ° C among them, obtaining Tmax ° C-Tabe ° C = Tdiff ° C, and comparing it with the data from the can discrimination database 24 in step S5 To do. Here, the can discrimination database 24 stores data a predetermined by experiment, and this data a is determined as an adhesive can when a <Tdiff ° C., and other than an adhesive can when a> Tdiff ° C. In step S5, it is determined whether the can 50 is an adhesive can or something else. Next, when it is determined that the can 50 is a welding can, in step S6, the central control unit 20 instructs the motor control unit 42 to operate at high speed rotation, and the motor 4 is rotated at high speed through the motor drive unit 41. In step S7, a command is issued to the inverter control unit 62 so that the output is high, and the inverter 6 is operated at a high output via the inverter driving unit 61, and the beverage temperature T1 in step S8 is operated until the desired temperature is reached. In step S9, the inverter 6 is stopped, and in step S10, the motor is turned off to complete the heating.
[0015]
On the other hand, if it is determined in step S5 that Tdiff ° C.> a (data from the can determination database 24), it is determined that the can 50 is an adhesive can. In that case, the process proceeds to the NO side of step S5, and the central controller 20 calculates the timing at which the bonding portion passes the position facing the induction coil and the timing at which it is removed from the induction coil at step S11, and at the timing at step S12. In step S13, the corresponding output high / low pattern of the inverter is calculated, the number of revolutions of the motor 4 is increased, and in step S14, the inverter 6 is turned on to control the output of the inverter 6 according to the output pattern. The inverter is continuously operated until the can of S8 reaches a desired temperature, the inverter 6 is stopped in step S9, and the motor 4 is stopped in step S10 to complete the heating.
Note that the experimentally obtained data for the high and low speeds are stored in advance in the rotational speed storage unit 43, and the data is called to the motor control unit to determine the rotational speed of the motor.
[0016]
【The invention's effect】
As described above, according to the first aspect of the present invention, it is possible to reliably discriminate a can whose joint is electrically insulated, such as an adhesive can. Further, according to the invention described in claim 2, it is possible to take an appropriate measure to prevent an accident such as burning of a can and leakage of a content beverage caused by local overheating of the adhesive portion, and claim 3. According to the invention described, not only can the adhesive can be heated by a low input when heating the bonded portion, and other parts can be heated by heating with a high input, There is an effect that the can can be heated to a desired temperature without extending the heating time too much.
[Brief description of the drawings]
FIG. 1 is a flowchart showing a heating procedure of a main part of an embodiment of the present invention. FIG. 2 is a block diagram of an apparatus according to the present invention. FIG. 3 is a side view of FIG. [Fig. 6] A diagram showing a portion where eddy currents and heating are concentrated when the bonding portion of the bonding can is opposed to the induction coil. [Fig. 6] In the circumferential direction of the can when the bonding can is induction-heated with a constant input. Surface temperature distribution chart [Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Induction coil 2 Roller 3 Presser roller 4 Drive motor 5 Beverage 6 Inverter 7 Can surface temperature sensor 8 Ferrite core 20 Central control part 21 Comparison discrimination | determination part 22 Timer 24 Can discrimination | determination database 41 Motor drive part 42 Motor control part 43 Rotation speed memory | storage part 61 Inverter drive unit 62 Inverter control unit

Claims (3)

Induction coil for induction heating of a can containing beverage, inverter for supplying electric power to the induction coil, motor for rotationally driving a roller in contact with the can, can surface temperature sensor for measuring the surface temperature of the can, and the surface temperature of the can The output of the sensor is provided as an input, and the inverter and the control means for controlling the rotation of the motor are provided. The motor is driven by the control means to rotate the can, and the output of the inverter is set to the low output. Is heated for a predetermined time, the output of the can surface temperature sensor is sampled within the time, the surface temperature of the can is measured, the temperature difference between the maximum value and the average temperature is calculated, and the temperature difference is calculated in advance. An induction heating apparatus for a beverage can characterized by comparing with predetermined data and determining whether it is an adhesive can or a can other than an adhesive can based on the comparison result. Induction coil for induction heating of a can containing beverage, inverter for supplying electric power to the induction coil, motor for rotationally driving a roller in contact with the can, can surface temperature sensor for measuring the surface temperature of the can, and the surface temperature of the can The output of the sensor is provided as an input, and the inverter and the control means for controlling the rotation of the motor are provided. The motor is driven by the control means to rotate the can, and the output of the inverter is set to the low output. Is heated for a predetermined time, the output of the can surface temperature sensor is sampled within the time, the surface temperature of the can is measured, the temperature difference between the maximum value and the average temperature is calculated, and the temperature difference is calculated in advance. Compare with the set data, determine whether it is a bonded can or a can other than a bonded can based on this comparison result, and heat the can to a desired temperature with a heating pattern according to the type of can With features Induction heating apparatus of beverage cans that. The induction heating apparatus for can beverage according to claim 2, wherein the heating pattern of the can determined to be an adhesive can is such that the inverter is controlled to a low output during a period when eddy currents concentrate along the adhesion part of the can. The part is formed by a combination of high and low outputs that are controlled to a predetermined high output.

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