JP5873649B2 - Electromagnetic induction heating type food baking machine - Google Patents

Description

  The present invention relates to a food baking machine that performs electromagnetic induction heating in large quantities and uniformly while automatically transferring rice crackers, cookies, cakes, and the like.

  As a device for electromagnetic induction heating of foods or other heated objects automatically or intermittently, either one or both of the front and back sides (upper and lower sides) are disclosed in Patent Documents 1 and 2 below. Also, the steel belt that handles and conveys the object to be heated is heated by an electromagnetic induction heating coil.

JP 2002-373770 A Japanese Patent Laid-Open No. 2003-9756 JP 2011-18511 A

  However, in the electromagnetic induction heating apparatus disclosed in Patent Document 1, a pair of facing endless conveyor belts (2) and (2) heated by the dielectric heating plates (5) and (5), and the dielectric itself are dielectric. Since the object to be heated (B) is sandwiched and transferred by a pair of steel belts facing each other, it is difficult to apply to a flexible object such as food, and the object is restricted.

  Moreover, in the food heating apparatus disclosed in Patent Document 2, the food to be heated (5) is loaded and transferred onto the upper surface of the steel belt (3) heated by the induction heating coil (4). As with the heating device of the above-mentioned Patent Document 1, it is not possible to mold and solidify the object to be heated (5) from the dough (material) because it does not have a firing mold for the object to be heated (A). is there.

  In this regard, a firing mold electromagnetic induction heater capable of forming and solidifying food to be heated is disclosed in Patent Document 3 described above, but this induction heating coil (C) is a single whole. Therefore, in addition to requiring a large-capacity and expensive inverter as a high-frequency power source for excitation, there is a problem that it is difficult to cope with a change in size and shape in a food baking mold and a uniform heating state cannot be obtained as a whole.

SUMMARY OF THE INVENTION The present invention aims to improve such a problem, and in order to achieve the object, in claim 1, a mold carrier that is automatically and circulated around a horizontal axis using a geared motor as a driving source, and ,

A number of food baking molds that open and close the food molding recesses by being pivotally pivoted to the mold carrier,

In the forward movement zone of the mold by the mold carrier, a plurality of the same first electromagnetic inductions that simultaneously heat the molds in which the food molding recesses are filled with the object to be fired in a closed state simultaneously from the vertical direction. A heater,

Similarly, in the return zone of the mold by the mold carrier, a number of second electromagnetic inductions that preheat or keep warm from at least the upper side of the mold that is in a developed state after the baking object whose food molding recess has been baked is taken out. With a heater,

Each of the molds is formed into a rectangular planar contour shape with flat upper and lower surfaces, and a plurality of food molding recesses arranged in parallel along the long side are on the short side parallel to the mold transport direction by the mold transport body. While it is determined to open and close around the horizontal hinge axis,

And said first and second electromagnetic induction heater of any substantially one by one into a square spiral state wound conductive magnetic induction heating coil of the corresponding size as the food molding recess of the mold, securing responsible for this As a unit body consisting of a coil support frame attached to a common base and a vertical ferrite core that is penetrated to the center of the heating coil so as to be adjustable up and down, a plurality of units are provided for each of the molds. Are installed in parallel,

Electrically connecting and wiring the plurality of heating coils in the first and second electromagnetic induction heaters with the corresponding plurality of heating inverters,

By controlling the output power of the inverter individually, the mutual induction phenomenon of the adjacent heating coils does not occur, and it is determined that a large number of molds are heated to an overall uniform temperature distribution. And

Further, in claim 2, a non-contact type temperature sensor is installed in the vicinity of the forward end point of the mold by the mold carrier, and the mold is in a closed state immediately before taking out the object to be baked in which the food molding recess is baked. The heating temperature is detected by the temperature sensor,

Based on the detected output signal, while controlling the output power of the corresponding heating inverter supplied to the heating coil of the first electromagnetic induction heater so that the heating temperature of the mold becomes the target set temperature,

Similarly, a non-contact type temperature sensor is also installed near the starting point of the forward movement of the mold by the mold carrier, and the heat retention or preheating temperature of the mold in which the food molding concave portion is in the unfolded state immediately before filling the baking object, Detected by the temperature sensor,

Based on the detected output signal, the output power of the corresponding inverter for heating supplied to the heating coil of the second electromagnetic induction heater is controlled so that the heat retaining or preheating temperature of the mold becomes the target set temperature. It is characterized by that.

According to the configuration of the first aspect, a large number of food baking molds pivotally attached to an automatic intermittent mold carrier so as to be freely openable and closable are closed in the forward movement band, and a number of first electromagnetics are closed. The induction heater simultaneously heats up and down at the same time, and in the backward movement zone, it is preheated or kept warm at least from above by a number of second electromagnetic induction heaters in a deployed state. The heating coil of the electromagnetic induction heater can be heated to an overall uniform temperature distribution that does not cause the mutual induction phenomenon by controlling the power of the inverter for heating. There is a possible effect.

In addition, since the heating coils of the first and second electromagnetic induction heaters and the inverters for heating are arranged correspondingly for each mold, the size and shape of the mold change depending on the type of food. However, by using a combination of a large number of low-capacity inverters with a small capacity, it is possible to immediately respond to changes in the mold, and the convenience is remarkably excellent.

In that case, if the configuration of claim 2 is adopted, the heating temperature of the mold, which is regarded as the baking temperature of food, can be maintained at the target set temperature, and the overall uniformity can be ensured. Useful.

It is a schematic side view of the electromagnetic induction heating type food baking machine according to the present invention. FIG. 2 is a schematic plan view of FIG. 1. It is an expanded sectional view which follows the 3-3 line of FIG. FIG. 4 is a cross-sectional view taken along line 4-4 of FIG. It is an expanded sectional view which follows the 5-5 line of FIG. It is the elements on larger scale of FIG. 2, Comprising: The grid | lattice arrangement | sequence state of the electromagnetic induction heater is shown. It is a top view corresponding to FIG. 6 which shows the zigzag arrangement | sequence state of an electromagnetic induction heater. It is a perspective view which extracts and shows three electromagnetic induction heaters located corresponding to one mold. It is a top view of FIG. It is a top view of the state which installed many electromagnetic induction heaters in parallel. It is a block diagram which shows the connection state of a several electromagnetic induction heater and its corresponding heating inverter.

Hereinafter, the embodiment of the present invention will be described in detail with reference to the drawings. FIGS. 1 and 2 show an outline of an electromagnetic induction heating type food baking machine suitable for a production line for rice crackers, cookies, cakes, etc. in a factory. Doughs (materials) such as rice crackers and cookies form the object to be fired (1).

The food baking machine circulates a number of food baking molds (M) for baking (molding and solidifying) the object to be baked (1) and the mold (M) around a horizontal axis. A rigid machine frame (C) and a number of first and second electromagnetic induction heaters (H1) and (H2), which are also heat sources for the mold (M), are used as main components. Equipped in 2).

First, the mold carrier (C) is a conveyor spur drive geared motor (3) installed and fixed to the machine frame (2), and a drive sprocket connected to this via a transmission chain (4) and the like. (5) and a driven sprocket (6) and a chain conveyor (roller chain) (7) wound around the front and rear of both sprockets (5) and (6). The chain conveyor (7) A large number of molds (M) mounted at a necessary minimum interval (d) are automatically and intermittently conveyed in the direction of the arrow (A) in FIG. In that case, the stop time of the mold (M) is set to be significantly longer than the moving time.

As shown in FIGS. 3 to 5, the mold (M) includes a mold body (9) and a lid (which are pivotally connected so as to be able to open and close up and down in a vertical direction via a horizontal hinge portion (8). 10), and the target baking object (1) (dough such as cookies) filled in the food molding recess (11) of the mold body (9) is covered with the lid (10) from above. It has become so.

Moreover, the lower surface (rear surface) of the mold body (9) and the upper surface (front surface) of the lid (10) in a state of covering the fired object (1) are both simple flat surfaces. The mold body (9) and the lid (10) are made of magnetic metal (preferably iron) having substantially the same thickness (t) and material, and the object to be fired (1) is moved from the vertical direction (both front and back sides) to each other. It sets so that it can heat uniformly by the same 1st electromagnetic induction heater (H1).

The mold (M) in the illustrated embodiment has a substantially rectangular planar contour shape, and the hinge part (8) is arranged on the short side (x) parallel to the conveyance direction (front-rear direction) by the mold conveyance body (C). The three food molding recesses (11) are arranged in parallel along the long side (y) of the mold body (9). However, the number of such food molding recesses (11) may be plural.

In the illustrated embodiment, the mold (M) has a mold body (9) having a food molding recess (11) and a lid (10) having no food molding recess (11). Although it consists of 1 set, you may employ | adopt the mold (M) of the half-divided form which can be used upside down (front-and-back) reversal by the same food shaping | molding recessed part (11) facing each other.

In any case, the mold (M) is moved to the food molding recess (11) from above until it is closed from the unfolded state at the forward movement start point (mold closing part) (a) in FIG. In the zone (F) where the object to be baked (cookie dough) (1) is automatically and quantitatively filled and moved forward (A) in FIG. Electromagnetic induction heating is performed simultaneously from the up and down direction (both front and back sides) by a number of first electromagnetic induction heaters (H1). The target heating temperature of the mold (M) (target firing temperature of the object to be fired) is about 175 ° C. as an example.

Then, the mold (M) reaches the forward movement end point (mold development part) (b) in FIG. At least the mold body (9) of the mold (M) in which the baked product (the cookie) (1) is taken out automatically or manually, and is being moved backward in FIG. ) Is warmed or preheated from above (back side) by a number of second electromagnetic induction heaters (H2) existing in the return zone (R).

It is desirable that the hanging lid body (10) developed from the mold body (9) is also kept warm or preheated by a number of electromagnetic induction heaters (not shown) corresponding to the lid body (10). This is because the heating temperature of the mold (M), which is regarded as the firing temperature of the object to be fired (1), can be quickly increased to the target set temperature without loss.

In that case, a large number of the above-mentioned molds (M), each one of which is a plurality (three in the illustrated embodiment) of the corresponding first and second electromagnetic induction heaters (H1) (H2), and these A large number of corresponding resonant inverters (high frequency power supplies) (12) that independently control the power supplied to the inverter (frequency, phase, voltage, etc.) are heated to an overall uniform temperature. .

That is, the number of the first and second electromagnetic induction heaters (H1) and (H2) and the resonant inverter for heating (12) is the number of the food molding recesses (11) formed in each mold (M). Regardless of this, it is always installed as a plurality. Moreover, as the heating inverter (12), an inexpensive one having an output of 1.2 Kw or less, particularly about 500 w is preferable. In FIG. 6, a large number of first and second electromagnetic induction heaters (H1) and (H2) are arranged in parallel in the overall lattice state, but these may be installed in a so-called staggered arrangement state as shown in FIG. There is no problem.

As shown in FIGS. 3 to 5, the first and second electromagnetic induction heaters (H1) and (H2) are wound in a substantially square shape having a size corresponding to the food molding recess (11) of each mold (M). The same electromagnetic induction heating coil (work coil) (13) and a non-magnetic body (stainless steel, aluminum, etc.) coil support frame (S) for stably handling and fixing the heating coil (13), It is a unit body comprising a ferromagnetic ferrite core (14) penetrating through the center of the heating coil (13).

The coil support frame (S) includes a substantially square support plate (15), one core receiving bolt (16) fastened to the support plate (15) so as to be adjustable up and down, and a plurality of coil receiving bending bolts (17). ), And each of the coil support frames (S) is attached to a common frame (18), whereby three illustrated first and second electromagnetic induction heaters (H1) and (H2) are illustrated. Are in parallel with the machine casing (2). (19) shows a heat insulating material interposed between the heating coil (13) and the ferrite core (14) of the first and second electromagnetic induction heaters (H1) and (H2) and the mold (M) facing each other. However, an electrical insulating sheet for protecting the heating coil (13) from electric leakage and electric shock is not shown.

Further, the heating coil (13) of the first and second electromagnetic induction heaters (H1) and (H2) is a copper wire (Litz wire) having a constant thickness (diameter) or preferably a substantially square spiral from a rectangular copper wire. A connection terminal (20) that is one piece wound in a state and is separated from both ends is connected and wired to the output terminal of the heating inverter (high frequency power supply) (12), and is required from the inverter (12) In the food baking machine of the present invention, there are a plurality of heating coils (13) of the first and second electromagnetic induction heaters (H1) (H2) for heating the mold (M), As shown in the block diagram of FIG. 11, the power is controlled by one of the corresponding inverters (12) one by one, and the adverse effect of the mutual induction phenomenon by the adjacent heating coil (13) (circulation current between inverters, Heating coil boundary It is adapted to avoid uneven etc.) of the temperature distribution in the.

That is, even if a plurality of electromagnetic induction heating coils (13) and a corresponding plurality of heating inverters (high frequency power supplies) (12) are adopted, the output power (frequency, phase, voltage, etc.) of the inverter (12) ) Individually at a high speed, as if a single heating coil was used, a plurality of molds (M) arranged in parallel and the whole object to be fired (1) were heated to a uniform temperature. It can be heated to a distributed state.

Furthermore, a non-contact type temperature sensor (temperature measurement unit) (21) such as a thermopile or a radiation thermometer is installed near the forward end point (mold development unit) (b) of the mold (M). Thus, the heating temperature of the mold (M) in the closed state immediately before taking out the object to be fired is detected as the firing temperature of the object to be fired (1) and detected based on the detected output signal. The output power of the corresponding inverter (12) supplied to the heating coil (13) of the first electromagnetic induction heater (H1) that heats the mold (M) in the closed state in (F) is used as the mold. It is preferable to control so that the heating temperature of (M) is maintained as the target set temperature.

In addition, a non-contact temperature sensor (temperature measuring unit) (22) such as a radiation thermometer is also installed in the vicinity of the forward movement starting point (mold closing unit) (a) of the mold (M), Thereby, the preheating (warming) temperature of the mold (M) in the unfolded state immediately before filling the object to be fired is detected, and the mold in the unfolded state in the return zone (R) based on the detection output signal ( In order to adjust the heating temperature of the second electromagnetic induction heater (H2) that preheats or keeps M), the output power of the corresponding inverter (12) is controlled so that the mold (M It is desirable to prevent the material from being naturally cooled or being overcooled by filling the material to be fired (1) again. What is necessary is just to set the preheating (heat retention) temperature of the metal mold | die (M) in the expansion | deployment state substantially equivalent to the target baking temperature (about 175 degreeC illustrated previously) of to-be-fired thing (1).

The operation of the food baking machine according to the present invention will be described using the cookie dough (material) exemplified above as an object to be baked (1). A mold that is automatically and intermittently conveyed in the direction of arrow (A) in FIG. In the forward movement starting point (mould closing part) (a) of (M), the object (1) to be baked from above into the food molding recess (11) of the mold (M) in the unfolded state immediately before being closed. ) Is automatically and quantitatively filled.

The mold (M) filled with the object to be fired (1) is moved to the front (A) in the closed state (F), and the first electromagnetic induction heater (H1) corresponding to the zone (F). ) Is simultaneously heated from the vertical direction (both front and back sides).

Eventually, when the mold (M) reaches the forward movement end point (mold development part) (b) in FIG. 1, the mold (M) is developed from the closed state until then, and the food molding recess ( The object to be fired (1) formed and solidified (fired) from 11) is taken out automatically or mechanically or manually.

Then, the mold (M) that has been emptied after the removal is moved backward from the mold main body (9) to the reverse side with the lid (10) hanging from the mold body (9). The die main body (9) is preheated or kept warm from above (back side) by the heating coil (13) of the second electromagnetic induction heater (H2) positioned corresponding to the mold main body (9) in the return zone (R). Returning to the initial forward movement start point (mold closing part) (a) and repeating such one cycle, a number of molds (M) are heated by electromagnetic induction to produce a large amount of objects to be fired. (1) can be fired.

In that case, the heating coils (13) of the first and second electromagnetic induction heaters (H1) and (H2) respectively corresponding to the forward movement band (F) and the backward movement band (R) of the mold (M) are: Each of the molds has a substantially square spiral state, and a plurality of (three in the illustrated embodiment) are arranged in parallel for each of the molds (M), and the plurality of corresponding heating units are used. By individually controlling the power of the inverter (high frequency power source) (12) so that the mutual induction phenomenon between the heating coils (13) does not occur and adjusting the heating action of the heating coil (13), the mold ( The temperature distribution of M) and the firing state of the object to be fired (1) can be ensured uniformly.

As a result, the heating coils (13) of the first and second electromagnetic induction heaters (H1) and (H2) can be arranged close to each other, and a ferrite core ( 14), which is penetrated so as to be adjustable in elevation, is useful for mass production of food in a uniform baked state.

Even if the size and shape of the mold (M) for molding / solidifying (baking) the material to be fired (food or its dough) (1) changes, many first and second electromagnetic inductions By using a combination of heaters (H1) (H2) and a number of preferably low-cost inverters (high frequency power supplies) (12) that supply power to their heating coils (13), preferably with a small capacity (eg about 500w output) , Can respond to the changes, and is excellent in flexibility and convenience.

(1) ・ Substrate (2) ・ Machine frame (3) ・ Gard motor (4) ・ Transmission chain (5) ・ Drive sprocket (6) ・ Drive sprocket (7) ・ Chain conveyor (8) ・ Hinge (9) · Mold body (10) · Lid (11) · Food molding recess (12) · Inverter (high frequency power supply)
(13) · Electromagnetic induction heating coil (14) · Ferrite core (15) · Support plate (16) · Core receiving bolt (17) · Coil receiving bending bolt (18) · Mounting base (19) · Thermal insulation (20) · Connection terminal (21) (22) · Temperature sensor (C) · Mold carrier (H1) (H2) · First and second electromagnetic induction heaters (M) · Mold (F) · Forward travel zone (R)・ Return band (a) ・ Forward start point (mold closing part)
(B) · the forward motion the end point (mold expansion unit)

Claims (2)

A mold carrier (C) that automatically and continuously circulates around a horizontal axis using a geared motor (3) as a drive source;
A number of food baking molds (M) that open and close the food molding recess (11) by being pivotally pivoted to the mold carrier (C),
Mold (M) in which the food molding recess (11) is in a closed state filled with the object to be fired (1) in the forward movement zone (F) of the mold (M) by the mold carrier (C). A plurality of the same first electromagnetic induction heaters (H1) that uniformly heat from the vertical direction at the same time,
Similarly, in the return zone (R) of the mold (M) by the mold carrier (C), the mold (11) that is in the unfolded state after taking out the baked object (1) in which the food molding recess (11) is baked. M) including a plurality of second electromagnetic induction heaters (H2) for preheating or keeping warm at least from above,
Each of the molds (M) is formed into a rectangular planar contour shape with flat upper and lower surfaces, and a plurality of food molding recesses (11) juxtaposed along the long side (y) are formed on the mold carrier (C ) In the short side (x) parallel to the mold conveying direction, and so as to open and close around the axis of the horizontal hinge part (8),
Each of the first and second electromagnetic induction heaters (H1) and (H2) was wound one by one in a substantially square spiral state having a size corresponding to the food molding recess (11) of each mold (M) . a conductive magnetic induction heating coil (13), lifting adjustably through a coil support frame attached to a common frame (18) to secure responsible for this (S), similarly to the center of the heating coil (13) As a unit body composed of a vertical ferrite core (14) formed, a plurality of units per one of the molds (M) are installed in parallel,
Electrically connecting and wiring the plurality of heating coils (13) in the first and second electromagnetic induction heaters (H1) and (H2) with the corresponding plurality of heating inverters (12),
By individually controlling the output power of the inverter (12), the mutual induction phenomenon of the adjacent heating coil (13) does not occur, and a large number of molds (M) have an overall uniform temperature distribution. An electromagnetic induction heating type food baking machine characterized in that it is determined to be heated. A non-contact temperature sensor (21) is installed near the forward end point (b) of the mold (M) by the mold carrier (C), and the food molding recess (11) is baked. The heating temperature of the mold (M) in the closed state immediately before removal is detected by the temperature sensor (21),
Based on the detected output signal, the output power of the corresponding heating inverter (12) supplied to the heating coil (13) of the first electromagnetic induction heater (H1) is determined by the heating temperature of the mold (M). While controlling to the target set temperature,
Similarly, a non-contact temperature sensor (22) is also installed near the forward movement start point (a) of the mold (M) by the mold carrier (C), and the food molding recess (11) is filled with the object to be fired The temperature sensor (22) detects the heat retaining or preheating temperature of the mold (M) in the immediately previous unfolded state,
Based on the detected output signal, the output power of the corresponding inverter for heating (12) supplied to the heating coil (13) of the second electromagnetic induction heater (H2) is used to keep the mold (M) warm or preheat. 2. The electromagnetic induction heating type food baking machine according to claim 1, wherein the temperature is controlled to be a target set temperature .

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