JP2012130275A - Electromagnetic induction heating type food baking machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electromagnetic induction heating type food baking machine, capable of baking a large quantity of food at high thermal efficiency inside a tunnel oven while automatically and intermittently conveying baking molds filled with the food dough.SOLUTION: Inside of the tunnel oven (1), through which the baking molds (M) attached to a conveyor (13) pass, is heated and constantly kept at atmospheric temperature higher than a target temperature for baking the food by electromagnetic induction heating coils (2a)-(2d) wound around the tunnel oven. The heating temperature of the baking molds (M) is detected by noncontact type mold temperature sensors (4a) and (4b), and hot air is directly blown to the baking molds (M) by rotating a blower fan (5) set inside the tunnel oven (1) based on detection output signals of the sensors (4a) and (4b).

Description

  The present invention relates to a machine for baking a large amount of various foods such as rice crackers, cookies and cakes by electromagnetic induction heating.

  2. Description of the Related Art As described in Patent Documents 1 and 2, tunnel ovens that heat and bake foods such as confectionery and bread from the top and bottom in the course of conveyance on a conveyor are conventionally known.

Japanese Patent Laid-Open No. 2002-166 JP 2004-194564 A

  However, in the tunnel oven disclosed in Patent Document 1, a gas burner is employed as the upper heating device (31) of the object to be fired (1), which causes a deterioration of the working environment and a precise heating power. In addition to being difficult to make adjustments, it is essential to work on ventilation equipment to handle large amounts of high-temperature exhaust gas.

  Similarly, the lower heating device (30) of the object to be fired (1) includes a heating furnace (55) in which hot air is generated by an electric heater (51), a fan (36), a fan motor (37), a supply duct (38). ), A discharge duct (39), a heating duct (40), etc., and therefore, complicated installation work for circulating the hot air is required, and further, due to the radiant heat of the heated heating duct (40) with hot air Since the object to be fired (1) is fired, there is a problem that the heating rate is slow and the adjustment control of the heating temperature cannot be easily performed.

  On the other hand, in the tunnel oven disclosed in Patent Document 2, the food dough on the baking plate (4) is heated by the upper heater (7) and the lower heater (8), and baked by the radiant heat of the electric heater. Therefore, not only is the heating rate slow, but also there is a problem that it is difficult to precisely adjust and control the heating temperature and the thermal efficiency is poor.

  The present invention aims to drastically solve such problems, and in order to achieve the object, according to claim 1, one or a plurality of electromagnetic induction heating is provided around a tunnel pot made of a magnetic metal. A tunnel oven with a coil wrapped around it,

  A large number of openable and closable baking molds having food dough receiving recesses;

  The endless chain conveyor with the firing molds mounted in parallel is automatically and intermittently circulated so that the endless chain conveyor can pass through the inside of the tunnel pot by the drive motor;

  As a state of directing the firing mold on the mold carrier, the required number of blower fans installed inside the tunnel pot,

  Similarly, as a state in which the firing mold on the mold carrier is oriented, a non-contact mold temperature detection sensor that detects the heating temperature of the firing mold from the outside of the tunnel pot,

  The inside of the tunnel kettle is heated by electromagnetic induction to maintain an atmospheric temperature that is always higher than the target baking temperature of the food,

  When the heating temperature of the baking mold inside the tunnel pot is detected by the mold temperature detection sensor and the heating temperature is lower than the target baking temperature of the food, the air is blown based on the detection output signal of the sensor. The fan is rotated and set so that hot air is blown onto the firing mold by the blower fan.

  Further, in claim 2, the required number of water spray nozzles, which replace or add to the blower fan, is set inside the tunnel pot as a state directed to the firing mold on the mold carrier,

  When the heating temperature of the baking mold is lower than the target baking temperature of the food, water is injected from the water injection nozzle to the baking mold based on the output signal of the mold temperature detection sensor that detects this. Thus, it is set to generate superheated steam.

  According to the said structure of Claim 1, the air (atmosphere) temperature in the inside of a tunnel pot is always kept at the heating temperature higher than the baking temperature made into the target of food, and the present heating temperature of a baking metal mold | die is set on it. When detected (measured) and the heating temperature is lower than the target baking temperature of the food, the blower fan is driven to rotate, and the hot air is blown directly onto the baking mold to heat (heat up). Therefore, it is possible to compensate for the difficulty of easily changing (heating) the internal temperature (atmosphere temperature) of the tunnel pot in a short time by heating with hot air directly blown to the firing mold, There is an effect that the temperature control can be controlled easily and precisely.

  In addition, since the electromagnetic induction heating coil is wound around the tunnel hook, electrical insulation and heat insulation to protect it are easy, and there are no electrical components inside the tunnel hook. There is an effect that it is possible to install water pipes, etc. that are necessary for cleaning of water.

  Furthermore, the electromagnetic induction heating coil does not directly heat the firing mold, but the firing mold is transported by the chain conveyor of the mold carrier in the tunnel pot around which the heating coil is wound. The gap between the firing mold and the tunnel kettle can be secured freely and without the need for advanced technology and abundant experience in manufacturing and processing them, and the maximum production effect is expected. To get.

  If the structure of Claim 2 is employ | adopted, water will be directly injected to a baking metal mold from the water injection nozzle installed in the inside of the tunnel pot, and by the strong drying power and high condensation heat transfer property of the generated superheated steam The firing mold can be heated (temperature rise), and if the above blower fan and water injection nozzle are used in combination, the firing mold can be heated (temperature rise) more rapidly and efficiently. .

1 is an overall schematic side view of an electromagnetic induction heating type food baking machine according to the present invention. It is a slope view which extracts and shows the tunnel oven of the food baking machine. FIG. 3 is a perspective view showing a state in which a part of FIG. It is an expanded sectional view which extracts and shows the tunnel oven of FIG. It is a control circuit diagram of the electromagnetic induction heating type food baking machine according to the present invention. It is sectional drawing of the state which open | released the cover body of the baking metal mold | die. FIG. 7 is an enlarged cross-sectional view taken along line 7-7 in FIG. 4. It is the 8-8 line expanded sectional view of FIG. FIG. 9 is a cross-sectional view taken along line 9-9 in FIG. 7. FIG. 10 is an enlarged sectional view taken along line 10-10 in FIG. It is a perspective view which shows 1st modified embodiment of a tunnel oven. It is sectional drawing corresponding to FIG. 4 which shows 2nd modified embodiment of a tunnel oven. It is sectional drawing corresponding to FIG. 8 which shows 3rd deformation | transformation embodiment of a tunnel oven.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 shows an overall outline of an electromagnetic induction heating type food (for example, cookies) baking machine according to the present invention. ) Supported as a main component, a tunnel oven (T), a mold carrier (C), and a large number of firing molds (M).

  First, the tunnel oven (T) has a fixed length (L) tunnel kettle (1) made of iron, nickel, manganese, alloys thereof, and other magnetic metals, and a circumference thereof. It consists of a plurality of electromagnetic induction heating coils (2a), (2b), (2c), and (2d) that are wound at a constant interval (D), and the separated ends of each of the heating coils (2a) to (2d) are The wiring is connected to the output terminals of the excitation high-frequency power source (heating inverter) (3a) (3b) (3c) (3d) via a connection terminal (not shown).

  And if the high frequency current is supplied from the high frequency power sources (3a) to (3d) to the corresponding electromagnetic induction heating coils (2a) to (2d) to generate a magnetic flux interlinking with the tunnel pot (1), An eddy current flows through the tunnel kettle (1), the tunnel kettle (1) generates heat due to Joule heat, and the inside of the tunnel kettle (1) is heated to a temperature higher than the target baking temperature (for example, about 180 ° C.) For example, it can be heated to about 300 ° C.).

  (4a) (4b) is a required number (1) for detecting (measuring) the current heating temperature of the firing mold (M) from the outside of the tunnel pot (1) during the transfer in the tunnel pot (1). Or a plurality of non-contact type mold temperature detection sensors (preferably radiation thermometers) between the adjacent electromagnetic induction heating coils (2a) to (2d) on the wall surface of the tunnel pot (1). By forming a heat-resistant glass window (not shown) on the surface, the heating temperature of the firing mold (M) can be detected (measured) through the glass window.

  (5) and (6) are based on the detection output signals of the mold temperature detection sensors (4a) and (4b), and the required number of rotations when the temperature of the firing mold (M) is lowered (one or A plurality of blower fans and a fan motor for driving the blower fan, and as a positional relationship facing the adjacent ones of the electromagnetic induction heating coils (2a) to (2d), the wall surface of the tunnel pot (1) (preferably Are installed at the bottom and sides. Directly blowing hot air onto the firing mold (M) being transported in the tunnel pot (1) by the rotating action of the blower fan (5) to heat (heat up) the firing mold (M). Thus, it is possible to adjust the firing temperature as a target of food (cookies).

  That is, the electromagnetic induction heating coils (2a) to (2d) are dedicated to heating the air (atmosphere) inside the tunnel kettle (1), and the baking molds by the food (cookies) dough taking heat away. The temperature drop of (M) is prevented by the hot air of the blower fan (5), so to speak, the food (cookies) is baked efficiently in a short time so as to receive the hot air from the fan while in the sauna bath. It has come to gain.

  According to this, the point that the internal temperature (atmosphere temperature) of the tunnel pot (1) cannot be easily changed (heated up) in a short time can be supplemented by heating the firing mold (M) with hot air, and the temperature There is an advantage that the adjustment control can be easily performed. If the electromagnetic induction heating coils (2a) to (2d) are separated from each other so that mutual induction failure does not occur or a magnetic shield is interposed, the heating temperature between the adjacent electromagnetic induction heating coils (2a) to (2d). In this case, a blower fan (5) that blows hot air directly on the firing mold (M) is interposed, and the electromagnetic induction heating coils (2a) to (2) of the tunnel pot (1). 2d) does not heat the food to the target baking temperature (for example, about 180 ° C.), and the air (atmosphere) in the tunnel (1) in the tunnel kettle (1) is much higher than the baking temperature of the food. Since the heating is maintained up to a high temperature (for example, about 300 ° C.), the time required for the firing mold (M) to pass through the tunnel kettle (1) is, for example, a short time of about 2 minutes. Because it ’s not too much, Serial local decrease in the heating temperature generated between mutually adjacent electromagnetic induction heating coil (2a) ~ (2d) with each other, there is also a high precision not lead to such difficulties of adjustment control effect of the temperature.

  In the tunnel oven (T) shown in FIGS. 1 to 4, a plurality of electromagnetic induction heating coils (2a) to (2d) are wound around the tunnel pot (1) at regular intervals (D), and the heating power Is adjusted by individual control of the corresponding high-frequency power sources (3a) to (3d), and the air (atmosphere) temperature of the entire interior of the tunnel hook (1) is maintained, but FIG. 11 corresponding to FIG. As shown in the first modified embodiment of the present invention, one long electromagnetic induction heating coil (2) is wound around the entire circumference of the tunnel hook (1), and the both ends thereof are separated by a corresponding high frequency power source. Connection wiring may be used in (3). (7) is a heat insulating layer covering and protecting the periphery of the electromagnetic induction heating coils (2a) to (2d), and is made of glass fiber or synthetic resin.

  FIG. 12 shows a second modified embodiment of the tunnel oven (T), in which the tunnel hook (1) is not formed as a single long object as shown in FIG. A plurality of tunnel shuttle segments (1a) (1b) (1c) (1d) thus divided are assembled to the required constant length (L).

  That is, the end tunnel hook segments (1a) (1a) and the intermediate tunnel hook segments (1d) (1d) around which the electromagnetic induction heating coils (2a) (2d) are wound, and the electromagnetic induction heating coils (2a) to ( 2d) is not wound, in other words, a non-contact mold temperature detection sensor (4a) (4b) or / and a blower fan (5) and a fan motor (6) for driving the rotation are installed instead. Prepare and prepare intermediate tunnel shuttle segments (1b), (1b) and (1c), preferably in an alternating series as shown in FIG. 12, and connect the mounting flanges (8) so as to be detachable and replaceable. Thus, it is assembled and integrated into a tunnel hook (1) having a fixed length (L) as shown in FIG.

  The tunnel kettle (1) having such a configuration can also be adopted, and then the tunnel kettle segments (1a) to (1d) can be reassembled and added to have a length suitable for baking various foods. There is an effect that a tunnel oven (T) can be easily obtained. In addition, it cannot be overemphasized that the heat insulation layer (7) which protects the electromagnetic induction heating coils (2a)-(2d) is coat | covered around the said tunnel hook segments (1a)-(1d).

  Further, FIG. 13 shows a third modified embodiment of the tunnel oven (T) corresponding to FIG. 8, in which the electromagnetic induction heating coils (2a) to (2d) in the tunnel pot (1) are adjacent to each other. As a positional relationship facing each other, the required number (one or more) of water injection nozzles (9) are installed on the wall surface (preferably the upper and lower parts) of the tunnel pot (1). Water is directly sprayed onto the firing mold (M) that is being transported inside to generate superheated steam, and the heating (heating) efficiency of the fired mold (M) is improved by the superheated steam.

  The water jet nozzle (8) that generates such superheated steam and the blower fan (5) that blows the hot air may be employed separately, but are particularly preferably used in combination. This is because the fired mold (M) can be efficiently heated in a shorter time, and the heating temperature can be adjusted without any trouble.

  Next, the mold carrier (C) includes a chain conveyor rotational drive geared motor (10) fixedly installed on the machine frame (F), a drive sprocket (11) and a driven sprocket (10) connected to the gear conveyor (C). 12) and an endless chain conveyor (roller chain) (13) wound around the sprockets (11) and (12) in a flexible manner, and spaced apart from the chain conveyor (13) at regular intervals. A large number of firing molds (M) attached to the can be passed through the tunnel hook (1) while being automatically and intermittently conveyed in the directions of arrows (A) and (B) in FIG. It has become.

  Each piece of the firing mold (M) is composed of a mold body (15) and a lid body (16) that are pivotally connected to each other through a horizontal hinge portion (14) so as to be opened and closed in the vertical direction. The dough receiving recess (17) of the mold body (15) is filled with the dough (18) of the target food (cookies).

  In the illustrated embodiment, a pair of left and right (two) fabric receiving recesses (17) are arranged in parallel on the mold body (15), but may be formed as only one or three or more. Further, the firing mold (M) of the illustrated embodiment is composed of a pair of upper and lower parts of the mold body (15) and its lid (16), but is divided in half so that the same dough receiving recesses (17) face each other. Of course, the firing mold (M) may be adopted.

  In any case, on the entrance side of the tunnel pot (1) in the automatic intermittent transfer line of the chain conveyor (13), the desired food (cookies) dough (18) is placed in the baking mold (M). The dough receiving recess (17) is automatically and quantitatively filled from above, and enters the inside of the tunnel pot (1) as the chain conveyor (13) circulates. It is fired in response to heating of air (atmosphere) by the heating coils (2a) to (2d) and, if necessary, hot air from the blower fan (5). The baked food of the dough (18) is automatically or mechanically removed from the firing mold (M) on the exit side of the tunnel pot (1).

  In that case, although not shown in detail, the baking mold (M) is filled with the food dough (18) into the dough receiving recess (17) that opens upward on the entrance side of the tunnel pot (1). And gradually move in the direction of the arrow (A) in FIG. 1 under the fully covered state, and gradually open on the outlet side of the tunnel hook (1). The food that has been baked from the dough receiving recess (17) facing downward and the dough (18) is dropped onto the belt conveyor (19), which is located almost directly below. While being carried out by the belt conveyor (19), the baking mold (M) from which the food is taken out remains in the open state and moves backward in the reverse arrow direction (B) in FIG. It will reach the entrance side of the tunnel pot (1) by turning upwards It has become.

  In baking the food (cookies) using the food baking machine having the above-described configuration, the dough (18) of the food is burned on the entrance side of the tunnel pot (1) in the tunnel oven (T). The dough receiving recess (17) of the mold (M) may be automatically and mechanically filled from above.

  Then, the fired mold (M) is placed on the tunnel pot (1) by the chain conveyor (13) of the mold carrier (C) with the dough receiving recess (17) covered. The food dough (18) is indirectly received by entering the inside and receiving the internal atmosphere (air) temperature heated by the electromagnetic induction heating coils (2a) to (2d) of the tunnel pot (1). It will be fired.

  In that case, the heating temperature of the firing mold (M) is detected (measured) by a non-contact mold temperature detection sensor (radiation thermometer) (4a) (4b) inside the tunnel pot (1). In the unlikely event that the target baking temperature of the food has not yet been reached, the fan motor (6) receiving the detection output signal from the sensors (4a) and (4b) is directed to the baking mold (M). The blower fan (5) is rotated, and hot air is directly blown onto the firing mold (M), thereby heating (heating).

  In this respect, in the third modified embodiment of the tunnel oven (T) shown in FIG. 13, the heating temperature of the firing mold (M) inside the tunnel pot (1) is also the above-described mold temperature detection sensor (radiation temperature). (4) When detected (measured) by (4a) and (4b), and has not yet reached the target baking temperature of the food, a detection output signal from the sensor (4a) (4b) is received. A nozzle opening / closing valve (not shown) opens the water injection nozzle (9) directed to the firing mold (M) and directly injects water from the water injection nozzle (9) into the firing mold (M). Due to the high condensation heat transfer property and strong drying power of the generated superheated steam, the firing mold (M) is efficiently heated (heated up) in a shorter time than the hot air of the blower fan (5). Yes.

  In any case, the food after the baking of the dough (18) is performed from the dough receiving recess (17) of the baking mold (M) that is turned over on the exit side that has passed through the tunnel pot (1). The belt is dropped onto the belt conveyor (19) located almost directly below, and is transferred from the belt conveyor (19) to a collecting container (not shown).

  Such a food baking method is substantially the same even when the first to third modified embodiments of the tunnel oven (T) shown in FIGS. In any case, the tunnel oven (T) constituting the food baking machine of the present invention adjusts the air (atmosphere) temperature inside the tunnel pot (1) according to the target baking temperature of the food. By doing so, the food is not directly baked.

  The air (atmosphere) temperature inside the tunnel pot (1) is maintained at a temperature much higher than the target baking temperature of the food, which means that the type of food and the target baking temperature. Although it changes, it is always constant. After that, the current heating temperature of the firing mold (M) inside the tunnel pot (1) is detected (measured), and the blower fan (5) is driven to rotate only when necessary so that hot air is blown into the firing mold. By directly spraying the mold (M) and heating (heating) the mold (M), the baking temperature of the target food is adjusted.

  As a result, the heating temperature of the baking mold and the target baking temperature of the food can be adjusted and controlled easily and with high accuracy, and there is an effect that can be widely applied to baking of various foods.

  Moreover, it is possible to ensure a wide gap between the tunnel hook (1) around which the electromagnetic induction heating coils (2a) to (2d) are wound and the firing mold (M) conveyed by the chain conveyor (13). This makes it possible to maximize the effects of mass production without the need for advanced machine manufacturing techniques and processing.

  Furthermore, since the electromagnetic induction heating coils (2a) to (2d) are wound around the periphery (outer peripheral surface) of the tunnel hook (1), the electric insulation and heat insulation can be performed relatively easily. Since there is no electrical component in 1), there is an effect that a water pipe necessary for cleaning the tunnel kettle (1) can be installed after completion of the firing operation.

Compared to the tunnel oven that uses the gas burner mentioned at the beginning as a heating source, there is no exhaust heat / combustion exhaust (smoke soot, CO ₂ ), clean and cool work environment and high heating rate (rapid heating). In addition to being obtained, there is an effect that does not require skill of workers involved in food baking or high lining costs.

  On the other hand, compared with tunnel ovens that use sheathed heaters or other electric heaters as the heating source, the air (atmosphere) in the interior (baking chamber) is indirectly rapidly heated by electromagnetic induction heating of the tunnel kettle. The heating temperature can be easily maintained and controlled.

(1)-Tunnel hook (1a) (1b) (1c) (1d)-Tunnel hook segment (2) (2a) (2b) (2c) (2d)-Electromagnetic induction heating coil (3) (3a) (3b ) (3c) (3d) ・ High frequency power supply (inverter)
(4a) (4b) · Mold temperature sensor (5) · Blower fan (6) · Fan motor (7) · Heat insulation layer (8) · Mounting flange (9) · Water injection nozzle (10) · Geared motor ( 11) · Drive sprocket (12) · Driven sprocket (13) · Chain conveyor (14) · Hinge (15) · Mold body (16) · Lid (17) · Dough receiving recess (18) · Food dough (19) ・ Belt conveyor (C) ・ Mold carrier (F) ・ Machine frame (M) ・ Firing mold (D) ・ Constant interval (L) ・ Constant length

Claims (2)

A tunnel oven in which one or a plurality of electromagnetic induction heating coils are wound around a tunnel pot made of a magnetic metal;
A large number of openable and closable baking molds having food dough receiving recesses;
The endless chain conveyor with the firing molds mounted in parallel is automatically and intermittently circulated so that the endless chain conveyor can pass through the inside of the tunnel pot by the drive motor;
As a state of directing the firing mold on the mold carrier, the required number of blower fans installed inside the tunnel pot,
Similarly, as a state in which the firing mold on the mold carrier is oriented, a non-contact mold temperature detection sensor that detects the heating temperature of the firing mold from the outside of the tunnel pot,
The inside of the tunnel kettle is heated by electromagnetic induction to maintain an atmospheric temperature that is always higher than the target baking temperature of the food,
When the heating temperature of the baking mold inside the tunnel pot is detected by the mold temperature detection sensor and the heating temperature is lower than the target baking temperature of the food, the air is blown based on the detection output signal of the sensor. An electromagnetic induction heating type food baking machine characterized in that the fan is rotated and hot air is blown onto the baking mold by the blower fan. Install the required number of water injection nozzles in place of or in addition to the blower fan inside the tunnel kettle as a state of directing the firing mold on the mold carrier,
When the heating temperature of the baking mold is lower than the target baking temperature of the food, water is injected from the water injection nozzle to the baking mold based on the output signal of the mold temperature detection sensor that detects this. The electromagnetic induction heating type food baking machine according to claim 1, which is set to generate superheated steam.

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