JP2014140340A - Conveyor-type food heating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily change a heating state of the upper and lower surfaces of a food with a simple configuration in a conveyor-type food heating device.SOLUTION: A conveyor type food heating device includes: a heating chamber 11 for heating a food F; a conveyor 20 which penetrates through the heating chamber 11, and conveys the food placed on an upper surface thereof; a plurality of upper electric heaters UH1, UH2 and UH3 arranged above the upper surface of the conveyor 20, in the heating chamber 11; and a plurality of lower electric heaters LH1, LH2 and LH3 arranged below the upper surface of the conveyor 20, in the heating chamber 11. First and second switches are provided, and by a combined operation of the first and second switches, the upper electric heaters UH1, UH2 and UH3, and the lower electric heaters LH1, LH2 and LH3, are selectively activated.

Description

  The present invention relates to a conveyor-type food heating apparatus that heats food while being conveyed by a conveyor, and more particularly, to a conveyor-type food heating apparatus that allows selection of the degree of heating of the upper and lower surfaces of food.

  Conventionally, for example, as shown in Patent Documents 1 and 2 below, a heating chamber that heats food, a conveyor that extends horizontally and passes through the heating chamber, and a heating chamber There is known a conveyor type food heating apparatus provided with an upper electric heater and a lower electric heater respectively disposed above and below the conveyor. In this conveyor-type food heating device, when food is placed on a running conveyor, the food is carried into the heating chamber from the carry-in entrance, and the upper and lower surfaces of the food by the upper electric heater and the lower electric heater in the heating chamber. Are heated at the same time, and the heat-treated food is carried out from the carry-out port.

  Such a conveyor type food heating apparatus can be used for various types of food processing because it can heat the food with a certain quality simply by placing the food on the conveyor. However, foods are not always a single one under certain conditions, and in addition to the problem that skill is required to set heating conditions, there are problems such as taking time for setup. As one of such problems, there is a problem that food is burnt or heat is not transmitted to the inside when it is a cold food just taken out of the refrigerator. In order to solve this problem, Patent Document 1 below discloses that a superheated steam ejector for ejecting superheated steam toward the upper surface of the conveyor is provided above the upstream side of the conveyor in the heating chamber.

  Moreover, as another problem, baking conditions, such as fish, confectionery, and bread, may differ. In order to solve this problem, in Patent Document 2 below, a plurality of electric heaters are provided above and below the conveyor, and a plurality of temperature detection elements for detecting the temperatures in the vicinity of the plurality of electric heaters are provided, respectively. It is shown that the reference temperature information in the vicinity of the plurality of electric heaters is stored in advance for each type, and the voltage applied to the plurality of electric heaters is adjusted based on the stored information and the detected temperature. ing.

JP 2010-41995 A JP-A-5-3747

  However, in the conveyor type food heating apparatus described in Patent Document 1, although the temperature of the food stored at a low temperature can be raised in a short time by the superheated steam ejector, the heating state of the upper and lower surfaces of the food is changed. Has no direct effect. Moreover, in the conveyor type food heating apparatus described in Patent Document 2, a plurality of temperature detection elements are required, and a voltage adjustment circuit for adjusting the voltage applied to the electric heater is required. It becomes complicated.

  The present invention has been made to cope with the above-described problems, and it is an object of the present invention to provide a conveyor type food heating apparatus that can easily change the heating state of the upper and lower surfaces of food with a simple configuration. Here, to explain a little about the heating of the upper and lower surfaces of the food, for example, toast cooking of bread is baked so that the upper and lower surfaces are uniform, and the degree of baking between the upper surface and the lower surface at that time The ratio is about 1: 1, for example. In the case of gratin, the surface (upper surface) is baked so as to be scorched with a strong fire, and the ratio of the degree of firing between the upper surface and the lower surface at that time is, for example, about 2: 1. In addition, when grilling open salted fish, open fish, etc., the fish should be placed on the conveyor with the skin side down, and the skin side (bottom surface) will be burned with high heat and the body side (top surface) with low heat. It is known that baked fish is completed, and the ratio of the degree of firing between the upper surface and the lower surface at that time is, for example, about 1: 2.

  Note that, in the configuration of the present invention described below, the reference numerals corresponding to the embodiments are exemplarily shown in parentheses, but this does not limit the configuration of the present invention.

  In order to achieve the above object, the present invention is characterized by a heating chamber (11) for heating the food (F), and a conveyor for passing the food placed through the heating chamber and placed on the upper surface (20a). (20), a plurality of upper electric heaters (UH1, UH2, UH3, UH4) disposed above the upper surface of the conveyor in the heating chamber, and a plurality of members disposed below the upper surface of the conveyor in the heating chamber. In a conveyor type food heating apparatus including lower electric heaters (LH1, LH2, LH3, LH4), at least two upper electric heaters among a plurality of upper electric heaters are energized and controlled simultaneously by an ON operation. In addition, a first lower electric heater that is less energized than the upper electric heater to be energized among a plurality of lower electric heaters is energized simultaneously with the at least two upper electric heaters. The switch means (36, 37, 45, 51, 52, 55, 56) and an ON operation simultaneously control energization of at least two or more lower electric heaters among the plurality of lower electric heaters, Second switch means (38, 39, 46,...) For controlling the energization of a lower number of upper electric heaters of the upper electric heaters simultaneously with the at least two lower electric heaters. 53, 54, 57, 58), and the energization of all of the plurality of upper electric heaters and the plurality of lower electric heaters is controlled by simultaneously turning on the first switch means and the second switch means. It is in.

  In this case, for example, the number of the plurality of upper electric heaters and the number of the lower electric heaters may be the same. Also, a plurality of upper electric heaters and a plurality of lower electric heaters may be arranged to face each other across the upper surface of the conveyor. Further, the plurality of upper electric heaters may be arranged at equal intervals in the movement direction of the upper surface of the conveyor, and the plurality of lower electric heaters may be arranged at equal intervals in the movement direction of the upper surface of the conveyor.

  In the conveyor type food heating apparatus having the features of the present invention, when the first switch means is turned on, at least two of the plurality of upper electric heaters are simultaneously energized and controlled. Of the lower electric heaters, the lower electric heaters, which are fewer than the upper electric heaters controlled to be energized, are energized and controlled simultaneously with the at least two upper electric heaters. If the second switch means is turned on, at least two or more lower electric heaters of the plurality of lower electric heaters are energized at the same time, and the energization control of the upper electric heaters is performed. A smaller number of upper electric heaters than the side electric heaters are energized simultaneously with the at least two lower electric heaters. If the first switch means and the second switch means are simultaneously turned on, all of the plurality of upper electric heaters and the plurality of lower electric heaters are energized and controlled.

  Accordingly, when it is desired to set the heating degree of the upper surface of the food and the heating degree of the lower surface of the food to a predetermined ratio (for example, approximately 1: 1), the first and second switch means may be turned on simultaneously. Further, when it is desired to make the heating degree of the upper surface of the food higher than the heating degree of the lower surface of the food on the basis of the predetermined ratio, only the first switch means needs to be turned on. Further, when it is desired to make the degree of heating of the lower surface of the food higher than the degree of heating of the upper surface of the food on the basis of the predetermined ratio, only the second switch means needs to be turned on. As a result, according to the feature of the present invention, the three heating degrees for the upper and lower surfaces of the food can be selected by a simple operation. Moreover, since only the first and second switch means need be provided for selecting the three heating degrees, a conveyor type food heating apparatus capable of selecting the three heating degrees can be easily configured.

  Another feature of the present invention is that the upper electric heater controlled by the first switch means is different from the upper electric heater controlled by the second switch means, and is controlled by the first switch means. The side electric heater is different from the lower electric heater which is energized and controlled by the second switch means.

  As described above, in this conveyor type food heating apparatus, the operation mode in which the first and second switch means are turned on, the operation mode in which only the first switch means is turned on, and only the second switch means are turned on. The food is heat-treated by selectively using the operation mode. In the conveyor type food heating apparatus having another feature of the present invention, in the operation mode in which the first and second switch means are simultaneously turned on, all the upper and lower electric heaters are energized and controlled. In the operation mode in which only the means is turned on and the operation mode in which only the second switch means is turned on, the different upper and lower electric heaters are energized and controlled. Thereby, when selectively using the operation mode in which only the first switch means is turned on and the operation mode in which only the second switch means is turned on, the same electric heater is not always energized and controlled. The tendency for the upper and lower electric heaters to operate equally increases. As a result, according to the other feature of the present invention, it is possible to avoid extremely increasing the frequency of use of a specific electric heater as compared with other electric heaters. Furthermore, when all the upper and lower electric heaters are composed of the same electric heater, the usage frequency is based on the operation mode in which only the first switch means is turned on, and the usage frequency is based on the operation mode in which only the second switch means is turned on. Is appropriate, there will be no significant difference in the usage time of all the upper and lower electric heaters, and even if all the upper and lower electric heaters are replaced at the same time depending on the service life of the electric heater, There is no waste.

  Another feature of the present invention is that each of the plurality of lower electric heaters is provided with a protective cover for avoiding adhesion of falling objects from food between the upper surface of the conveyor, and the plurality of upper electric heaters. The distance from the electric heater to the upper surface of the conveyor is larger than the distance from the plurality of lower electric heaters to the upper surface of the conveyor. This is because the heating capacity of the heater is made equal.

  In the conveyor type food heating apparatus having the other features of the present invention, even if there is a fallen object from the food such as a small piece of food or a seasoning liquid applied to the food by the protective cover, this fallen object Although the adhesion to the lower electric heater can be avoided, the protective cover lowers the degree of heating of the lower electric heater with respect to the food than the degree of heating of the upper electric heater with respect to the food. However, according to the other feature of the present invention, the distance from the plurality of upper electric heaters to the upper surface of the conveyor is made larger than the distance from the plurality of lower electric heaters to the upper surface of the conveyor, and is conveyed by the conveyor. Since the heating capability of the plurality of upper electric heaters for food and the heating capability of the plurality of lower electric heaters are made equal, the upper electric heater and the lower electric heater can contribute equally to the food. For example, if the number of upper and lower electric heaters is the same, the upper and lower surfaces of the food can be heated equally.

  Furthermore, another feature of the present invention is that the number of the plurality of upper electric heaters and the number of the lower electric heaters is three each, and the first switch means is one of the three upper electric heaters by an ON operation. Energization control of the two upper electric heaters on both sides sandwiching the upper electric heater at the center position, and the energization control of the lower electric heater at the central position among the three lower electric heaters, the second switch means is turned on The operation controls the energization of the two lower electric heaters on both sides of the lower electric heater at the center position among the three lower electric heaters, and the upper electric heater at the central position among the three upper electric heaters. This is because the energization is controlled.

  In the conveyor type food heating apparatus having other features of the present invention, as described above, in the operation mode in which the first and second switch means are turned on, all the upper and lower electric heaters are energized and controlled. In the operation mode in which only the first switch means is turned on and the operation mode in which only the second switch means is turned on, different upper and lower electric heaters are energized and controlled. As a result, according to another feature of the present invention, when the operation mode in which only the first switch means is turned on and the operation mode in which only the second switch means is turned on are selectively used, a specific electric heater The frequency of use can be avoided from being extremely increased compared to other electric heaters, and when all upper and lower electric heaters are composed of the same electric heater, the first switch means is used in an on mode. If the frequency and the frequency of use in the operation mode in which only the second switch means is turned on are appropriate, there will be no significant difference in the usage time of all the upper and lower electric heaters, depending on the service life of the electric heaters Even if all the upper and lower electric heaters are replaced at the same time, no great waste occurs. According to another aspect of the present invention, the above effect can be achieved with a simple configuration including three upper and lower electric heaters.

  Further, in this case, among the three upper and lower electric heaters, the three electric heaters that are energized and controlled by turning on the first switch means, and the energization control that is controlled by turning on the second switch means 3 If the two electric heaters are connected in a delta connection, application to a three-phase AC power supply becomes simple.

  Furthermore, as described above, if the heating capacity of the three upper electric heaters and the heating capacity of the three lower electric heaters for food are equal to each other, in the operation mode in which the first and second switch means are turned on, The ratio of the heating degree of the upper and lower surfaces of the food is approximately 1: 1, and the upper and lower surfaces of the food can be heated equally. On the other hand, in the operation mode in which only the first switch means is turned on, the ratio of the heating degree of the upper and lower surfaces of the food is approximately 2 to 1, and in the operation mode in which only the second switch means is turned on, the upper and lower surfaces of the food are The ratio of the degree of heating is approximately 1: 2. As a result, the selection of the degree of heating of the upper and lower surfaces of the food is simple and easy to understand, and even an amateur can easily handle the conveyor type food heating apparatus that allows the selection of the three operation modes.

1 is an overall schematic front view of a conveyor type food heating apparatus according to an embodiment of the present invention. It is a sectional side view of the conveyor type food heating apparatus seen along line 2-2 in FIG. It is a plane sectional view of the conveyor type food heating device seen along line 3-3 in FIG. It is a block diagram of the electric circuit apparatus of the said conveyor type food heating apparatus. It is explanatory drawing for demonstrating the operation state of the electric heater in the 1st operation mode of the said conveyor type food heating apparatus. It is explanatory drawing for demonstrating the operation state of the electric heater in the 2nd operation mode of the said conveyor type food heating apparatus. It is explanatory drawing for demonstrating the operation state of the electric heater in the 3rd operation mode of the said conveyor type food heating apparatus. It is a block diagram of the electric circuit apparatus of the conveyor type food heating apparatus which concerns on a modification. It is a block diagram of the electric circuit apparatus of the conveyor type food heating apparatus which concerns on another modification. Furthermore, it is a block diagram of the electric circuit apparatus of the conveyor type food heating apparatus which concerns on another modification. Furthermore, it is a block diagram of the electric circuit apparatus of the conveyor type food heating apparatus which concerns on another modification.

  Hereinafter, an embodiment of a conveyor type food heating apparatus according to the present invention will be described with reference to the drawings. FIG. 1 is an overall schematic front view of the conveyor type food heating apparatus according to an embodiment of the present invention. FIG. 2 is a side sectional view of the conveyor type food heating apparatus viewed along line 2-2 in FIG. FIG. 3 is a cross-sectional plan view of the conveyor type food heating apparatus viewed along line 3-3 in FIG.

  This conveyor type food heating apparatus has a conveyor oven body 10 having a heating chamber 11 for heating the food F, and an upper surface 20a extending in the horizontal direction and penetrating the heating chamber 11, and placed on the upper surface 20a. And a mesh-like conveyor 20 for transporting the food F. The conveyor oven body 10 includes a control box 12 on the right side, a drive box 13 on the left side, a lower box 14 on the lower side, and an upper box 15 on the upper side with respect to the heating chamber 11 when viewed from the front. The control box 12, the drive box 13, the lower box 14, and the upper box 15 are each formed of a metal plate material such as stainless steel, and are integrally connected and fixed with their outer wall surfaces aligned. The inner space surrounded by the control box 12, the drive box 13, the lower box 14, and the upper box 15 is the heating chamber 11.

  The heating chamber 11 is provided with a carry-in port 11a for carrying the food F placed on the upper surface 20a of the conveyor 20 into the heating chamber 11 on the front side, and cooking is performed in the heating chamber 11 on the rear side. A carry-out port 11b for carrying out the cooked food F is provided. In the heating chamber 11, upper electric heaters UH1, UH2, UH3 and lower electric heaters LH1, LH2, LH3 for cooking food F are provided. The upper electric heaters UH1, UH2, UH3 and the lower electric heaters LH1, LH2, LH3 are long and cylindrical glass tube heaters in which a carbon filament is enclosed in a quartz glass tube together with an inert gas (for example, argon gas). The far-infrared heater emits far-infrared rays and radiant heat by energizing the carbon filament. The upper electric heaters UH1, UH2, UH3 and the lower electric heaters LH1, LH2, LH3 are all configured identically, and their axial lengths are substantially the same as the width direction length of the conveyor 20. is there.

  The upper electric heaters UH1, UH2, UH3 extend in the heating chamber 11 above the upper surface 20a of the conveyor 20 in a direction orthogonal to the moving direction of the upper surface 20a of the conveyor 20 (the left-right direction in FIGS. 2 and 3). And arranged parallel to the upper surface 20a of the conveyor 20, that is, horizontally, at predetermined equal intervals along the moving direction of the upper surface 20a of the conveyor 20. The lower electric heaters LH1, LH2, and LH3 are disposed in the heating chamber 11 below the upper surface 20a of the conveyor 20 in a direction orthogonal to the moving direction of the upper surface 20a of the conveyor 20 (the left-right direction in FIGS. 2 and 3). It extends and is arranged along the moving direction of the upper surface 20a of the conveyor 20 at the predetermined equal intervals in parallel or horizontally with respect to the upper surface 20a of the conveyor 20. The upper electric heater UH1 and the lower electric heater LH1, the upper electric heater UH2 and the lower electric heater LH2, and the upper electric heater UH3 and the lower electric heater LH3 are respectively at the same position in the moving direction of the upper surface 20a of the conveyor 20, that is, the conveyor. It arrange | positions so that it may oppose on both sides of 20 upper surface 20a.

  Above the upper electric heaters UH1, UH2, and UH3, a reflector 16 is disposed for reflecting downward the radiant heat radiated upward. Protective covers 17-1, 17-2, and 17-3 are located below the upper surface 20a of the conveyor 20 and above the lower electric heaters LH1, LH2, and LH3, respectively, and the lower electric heaters LH1, LH2, and LH2, respectively. The lower electric heaters LH1, LH2, and LH3 are arranged close to each other so as to cover the upper portion of LH3. The protective covers 17-1, 17-2, and 17-3 are made of a highly heat-resistant and light-transmitting material such as quartz glass and are formed in an elongated shape having a semicircular cross section. As a result, even if a small piece of food F placed on the upper surface 20a of the conveyor 20 or a seasoning liquid applied to the food F falls, it adheres to the tube surfaces of the lower electric heaters LH1, LH2, and LH3. Is prevented.

  Here, the vertical positions of the upper electric heaters UH1, UH2, UH3 and the lower electric heaters LH1, LH2, LH3 will be described. Some of the far infrared rays and radiant heat radiated from the lower electric heaters LH1, LH2, and LH3 and reaching the food placed on the conveyor 20 are part of the protective covers 17-1, 17-2, 17-3 and the mesh It is shielded by the conveyor 20. Therefore, in order to equalize the heating capacity for the upper surface of the food F by the upper electric heaters UH1, UH2, UH3 and the heating capability for the lower surface of the food F by the lower electric heaters LH1, LH2, LH3, The vertical distance Lup between UH2 and UH3 and the upper surface 20a of the conveyor 20 is made longer than the vertical distance Ldw between the lower electric heaters LH1, LH2 and LH3 and the upper surface 20a of the conveyor 20. The ratio between the distance Lup and the distance Ldw should be confirmed and set by experiment. In this embodiment, the distance Lup is about three times the distance Ldw.

  As a result, when all of the upper electric heaters UH1, UH2, UH3 and the lower electric heaters LH1, LH2, LH3 are simultaneously operated, the degree of heating of the upper and lower surfaces of the food F becomes substantially equal. In addition, when two electric heaters of the upper electric heaters UH1, UH2, UH3 and one electric heater of the lower electric heaters LH1, LH2, LH3 are operated simultaneously, the upper surface of the food F The ratio between the degree of heating and the degree of heating of the lower surface is approximately 2 to 1. Further, when one electric heater of the upper electric heaters UH1, UH2, UH3 and two electric heaters of the lower electric heaters LH1, LH2, LH3 are operated simultaneously, the upper surface of the food F The ratio between the degree of heating and the degree of heating of the lower surface is approximately 1: 2.

  Further, in the heating chamber 11, there is provided a tray 18 that stores falling pieces such as small pieces of food F placed on the upper surface 20 a of the conveyor 20 and seasoning liquid applied to the food F.

  In the control box 12, an electric control device 30 (to be described later) for controlling the operating conditions of the conveyor type food heating device and a cooling fan FM for cooling the inside of the control box 12 are accommodated. In the drive box 13, the drive mechanism (not shown) of the conveyor 20 containing the transmission chain for rotating the conveyor 20 is accommodated. A drive motor GM is accommodated in the lower box 14, and the rotation of the drive motor GM is transmitted to the conveyor 20 via the transmission chain. The upper box 15 is provided with an exhaust port 15a communicating with the outside. Vents (not shown) are provided in the joint between the control box 12 and the lower box 14, the joint between the lower box 14 and the drive box 13, and the joint between the drive box 13 and the upper box 15, respectively. The control box 12, the lower box 14, the drive box 13, and the upper box 15 communicate with each other. Therefore, when the cooling fan FM is operated, outside air is sucked into the control box 12 to cool the electric control device 30 in the control box 12, and then flows into the lower box 14 to cool the drive motor GM. Thereafter, it flows into the drive box 13 to cool the transmission chain, and finally is discharged from the exhaust port 15a of the upper box 15 to the outside.

  Support frames 21 that extend horizontally and parallel to each other so as to penetrate the heating chamber 11 between the upper box 15 and the lower box 14 on the wall surface of the control box 12 and the drive box 13 on the heating chamber 11 side, 22 is fixed. Note that the support frames 21 and 22 have the same length, and at the same time, project from the front side and the back side (the left-right direction in FIGS. 2 and 3) of the conveyor oven body 10, They are facing each other. A columnar rotating rod 23 is rotatably supported at both ends of the front ends of the support frames 21 and 22 (right ends of FIGS. 2 and 3). A columnar rotating rod 24 is rotatably supported at both ends of the rear ends of the support frames 21 and 22 (left ends of FIGS. 2 and 3). A plurality of driven rollers 23a and 24a are fixed on the outer peripheral surfaces of the rotating rods 23 and 24, respectively. Also, in the vicinity of the center position in the front-rear direction (left-right direction in FIGS. 2 and 3) in the lower part of the heating chamber 11, a drive roller 25 connected to the drive motor GM via a transmission chain so as to be able to transmit power is rotatable. Is provided.

  The conveyor 20 is wound around a plurality of driven rollers 23a and 24a and a driving roller 25, and the support frames 21 and 22 support left and right ends (upper and lower ends of FIG. 3) of the conveyor 20 so as to be slidable. Note that the support widths of the left and right ends of the conveyor 20 of the support frames 21 and 22 are so small that they do not interfere with the heat radiation from the lower electric heaters LH1, LH2, and LH3 (for example, about 20 mm). Thereby, when the drive roller 25 is rotationally driven by the operation of the drive motor GM, the conveyor 20 has its upper surface 20a side from the front side to the back side of the conveyor oven body 10 (in the left direction in FIGS. 2 and 3). While moving, it rotates so that the lower surface 20b side may be moved from the back surface side of the conveyor oven main body 10 to the front side (right direction of FIG.2 and FIG.3). In this case, the upper surface 20a side of the conveyor 20 is located between the upper electric heaters UH1, UH2, UH3 and the lower electric heaters LH1, LH2, LH3, and the lower surface 20b side of the conveyor 20 is the lower electric heaters LH1, LH2, LH3. And the tray 18.

  Next, the electric control device 30 housed in the control box 12 will be described. As shown in FIG. 4, the electric control device 30 includes three power supply lines PW1, PW2, and PW3 connected to the commercial three-phase AC power supply line, as well as the commercial three-phase AC power supply line and the power supply line PW1, A main power switch 31 for opening and closing the PW2 and PW3 is provided. Between the power supply lines PW2 and PW3, an operation switch 32, a temperature fuse 33, an overheat prevention thermostat 34, and an exciting coil 35a of the main electromagnetic contactor 35 are connected in series.

  The operation switch 32 is turned on when the conveyor type food heating apparatus is operated, and opens and closes the main electromagnetic contactor 35 by the on / off operation. When the excitation coil 35a is not energized, the main electromagnetic contactor 35 turns off the relay switches 35b, 35c, and 35d interposed in the power supply lines PW1, PW2, and PW3, and the relay switch is energized by energization of the excitation coil 35a. 35b, 35c, and 35d are turned on. The thermal fuse 33 is cut when the temperature in the control box 12 becomes extremely high, and energization of the exciting coil 35a is prohibited. The overheat prevention thermostat 34 prohibits the energization of the excitation coil 35a when the temperature in the control box 12 becomes equal to or higher than the predetermined temperature, and when the temperature in the control box 12 becomes lower than the predetermined temperature, Remove the prohibition of energization. The predetermined temperature is lower than the temperature at which the thermal fuse 33 is cut, and the overheat prevention thermostat 34 is for avoiding unstable operation of the electric control device 30 and failure of the electric control device 30.

  The power supply lines PW1, PW2, and PW3 are connected to the power supply lines PW1a, PW2a, and PW3a for supplying power to the upper electric heaters UH1 and UH3 and the lower electric heater LH2 on the output side of the main electromagnetic contactor 35, and the upper electric heaters. The power supply lines PW1b, PW2b, and PW3b for supplying power to the heater UH2 and the lower electric heaters LH1 and LH3 are branched. Upper electric heaters UH1 and UH3 and lower electric heater LH2 are delta connected to three-phase power supply lines PW1a, PW2a and PW3a. Upper electric heater UH2 and lower electric heaters LH1, LH3 are delta connected to three-phase power supply lines PW1b, PW2b, PW3b. In this case, the electric heaters UH1, UH2, UH3, LH1, LH2, and LH3 are configured identically, and the applied voltage balance to the electric heaters UH1, UH2, UH3, LH1, LH2, and LH3 is achieved by the delta connection. Is to be maintained.

  A first switch 36 for selecting an operation mode and an exciting coil 37a of the electromagnetic contactor 37 are connected in series between the power supply lines PW2a and PW3a. The first switch 36 is turned on to operate the upper electric heaters UH1 and UH3 and the lower electric heater LH2, and opens and closes the electromagnetic contactor 37 by the on / off operation. When the exciting coil 37a is not energized, the electromagnetic contactor 37 turns off the relay switches 37b, 37c, and 37d interposed in the power supply lines PW1a, PW2a, and PW3a, and the relay switch is energized by energizing the exciting coil 37a. 37b, 37c, and 37d are turned on. Between the power supply lines PW2b and PW3b, a second switch 38 for selecting an operation mode and an exciting coil 39a of the electromagnetic contactor 39 are connected in series. The second switch 38 is turned on to operate the upper electric heater UH2 and the lower electric heaters LH1, LH3, and opens and closes the electromagnetic contactor 39 by the on / off operation. When the excitation coil 39a is not energized, the electromagnetic contactor 39 turns off the relay switches 39b, 39c, and 39d interposed in the power supply lines PW1b, PW2b, and PW3b, and the relay switch 39 is energized by energizing the excitation coil 39a. 39b, 39c, 39d are turned on.

  A cooling fan FM is connected between the power supply lines PW2 and PW3 on the output side of the main electromagnetic contactor 35. A drive motor GM and a speed controller circuit SC are connected between the power supply lines PW1 and PW3 on the output side of the main electromagnetic contactor 35. The speed controller circuit SC variably controls the rotational speed of the drive motor GM, that is, variably controls the moving speed of the conveyor 20 in accordance with the operation of the volume VR. The rotation speed of the drive motor GM is controlled steplessly from stop to high speed by operating the volume VR.

  Next, operation | movement of the conveyor type food heating apparatus comprised as mentioned above is demonstrated. The worker first turns on the main power switch 31 when starting to use the conveyor type food heating apparatus. When the main power switch 31 is turned on, the power supply lines PW1, PW2, and PW3 are supplied with power. Thereafter, the operator turns on the operation switch 32. When the operation switch 32 is turned on, the exciting coil 35 a of the main electromagnetic contactor 35 is energized through the temperature fuse 33 and the overheat prevention thermostat 34. Since the present invention is not directly related to the abnormality of the conveyor type food heating apparatus including the electric control device 30 in the control box 12, in the following description, the temperature fuse 33 and the overheat prevention thermostat 34 are always in a conductive state. Shall.

  By energizing the exciting coil 35a, the relay switches 35b, 35c, and 35d are turned on, and the cooling fan FM, the speed controller circuit SC, and the drive motor GM start to operate. By the operation of the cooling fan FM, outside air is sucked into the control box 12, and the sucked outside air flows to the control box 12, the lower box 14, the drive box 13 and the upper box 15, and the exhaust port 15 a of the upper box 15. Is discharged to the outside. Thereby, the electric control device 30 in the control box 12, the drive motor GM in the lower box 14, the transmission chain in the drive box 13, and the like start to be cooled. The drive motor GM is controlled by the speed controller circuit SC and starts to rotate at a speed set by the volume VR. The rotation of the drive motor GM is transmitted to the drive roller 25 through a transmission chain, and the conveyor 20 is also rotated by the rotation of the drive roller 25, and the upper surface 20a side of the conveyor 20 is changed from the front side to the back side of the conveyor type food heating device. Start moving to the side (from right to left in FIGS. 2 and 3). In this case, the worker adjusts the moving speed of the conveyor 20 to an appropriate speed by adjusting the volume VR in consideration of the type and size of the food F, the degree of baking finish, and the like.

  Next, the operator selectively turns on the first and second switches 36 and 38 according to the type of the food F, so that the upper electric heaters UH1, UH2, UH3 and the lower electric heaters LH1, LH2, The food is heat-treated by operating the LH3 in any of the following first to third operation modes. Hereinafter, the food heating process by the upper electric heaters UH1, UH2, UH3 and the lower electric heaters LH1, LH2, LH3 for each of the first to third operation modes will be described in detail.

  First, the first operation mode will be described. In the cooking of food F such as bread toast cooking, pizza, grilled chicken, roasted fish, roasted meat, and eggplant roasted food, the upper and lower surfaces of the food F are generally baked uniformly. In this case, the operator turns on the first and second switches 36 and 38 simultaneously. By simultaneously turning on the first and second switches 36 and 38, the exciting coil 37a of the electromagnetic contactor 37 and the exciting coil 39a of the electromagnetic contactor 39 are energized, and the relay switches 37b, 37c and 37d and the relay switches 39b and 39c are energized. , 39d are turned on. Thus, the upper electric heaters UH1 and UH3 and the lower electric heater LH2 are fed via the power supply lines PW1a, PW2a and PW3a, and the upper electric heater UH2 and the lower electric heaters LH1 and LH3 are supplied with the power supply lines PW1b, Power is supplied through PW2b and PW3b. The upper electric heaters UH1 and UH3 and the lower electric heater LH2 start to generate heat, and the upper electric heater UH2 and the lower electric heaters LH1 and LH3 also start to generate heat. FIG. 5 shows the states of the upper electric heaters UH1, UH2, UH3 and the lower electric heaters LH1, LH2, LH3 in the first operation mode. The upper electric heaters UH1, UH2, UH3 and the lower side in the heat generation state are shown in FIG. The electric heaters LH1, LH2, and LH3 are indicated by hatching.

  Next, the worker places food F such as bread, pizza, poultry, fish, beef, pork, eggplant, etc. one after another on the conveyor 20 before the carry-in entrance 11a. In this case, since the upper surface 20a side of the conveyor 20 is moving from the front side to the back side, that is, from the right side to the left side in FIGS. 2 and 3, the food F placed on the upper surface 20a of the conveyor 20 is the upper side. It is heated by the electric heaters UH1, UH2, UH3 and the lower electric heaters LH1, LH2, LH3, and is successively carried out from the carry-out port 11b. Thereafter, the operator picks up the food F carried out from the carry-out port 11b one after another from the upper surface 20a of the conveyor 20. In the first operation mode, the upper electric heaters UH1, UH2, and UH3 and the lower electric heaters LH1, LH2, and LH3 have the same heating capacity for the food F, so that the upper surface and the lower surface of the food F are almost uniformly baked. Is done. That is, the ratio of the heating degree of the upper surface and the lower surface of the food F is approximately 1: 1.

  Next, the second operation mode will be described. When the food F such as gratin is cooked by heating, the upper surface side is colored to be a finished product. In this case, the operator turns on only the first switch 36 of the first and second switches 36 and 38. By turning on only the first switch 36, only the exciting coil 37a of the magnetic contactor 37 is energized, and only the relay switches 37b, 37c, and 37d are turned on. Thus, the upper electric heaters UH1 and UH3 and the lower electric heater LH2 are supplied with power via the power supply lines PW1a, PW2a and PW3a, but the upper electric heater UH2 and the lower electric heaters LH1 and LH3 are not supplied with power. Only the electric heaters UH1, UH3 and the lower electric heater LH2 start to generate heat. FIG. 6 shows the state of the upper electric heaters UH1, UH2, UH3 and the lower electric heaters LH1, LH2, LH3 in the second operation mode, and the upper electric heaters UH1, UH3 and the lower electric heaters in the heat generation state. LH2 is hatched.

  Next, the operator places the food F such as the gratin on the upper surface 20a of the conveyor 20 one after another before the carry-in port 11a. Also in this case, since the upper surface 20a side of the conveyor 20 is moving from the front side to the back side, that is, from the right side to the left side in FIGS. 2 and 3, the food F placed on the upper surface 20a of the conveyor 20 is It is heated by the upper electric heaters UH1, UH3 and the lower electric heater LH2, and is successively carried out from the carry-out port 11b. Thereafter, the operator picks up the food F carried out from the carry-out port 11 b one after another from the upper surface 20 a of the conveyor 20. In the second operation mode, the heating capacity of the upper electric heaters UH1 and UH3 and the lower electric heater LH2 for the food F is the same, so the ratio of the heating degree of the upper surface and the lower surface of the food F is approximately 2 to 1. Become.

  Further, the third operation mode will be described. When cooking food F such as open-boiled fish (salt-dried fish), open-fish (eel, eel, etc.), place it on the upper surface 20a of the conveyor 20 with the skin side of the food F facing down, Bake the lower side of the skin with low heat and high heat. In this case, the operator turns on only the second switch 38 of the first and second switches 36 and 38. By turning on only the second switch 38, only the exciting coil 39a of the magnetic contactor 39 is energized, and only the relay switches 39b, 39c, 39d are turned on. Thus, the upper electric heater UH2 and the lower electric heaters LH1 and LH3 are supplied with power through the power supply lines PW1b, PW2b and PW3b, but the upper electric heaters UH1 and UH3 and the lower electric heater LH2 are not supplied with power. Only the electric heater UH2 and the lower electric heaters LH1, LH3 start to generate heat. FIG. 7 shows the states of the upper electric heaters UH1, UH2, UH3 and the lower electric heaters LH1, LH2, LH3 in the third operation mode. The upper electric heater UH2 and the lower electric heater LH1, which are in the heat generation state, are shown. LH3 is hatched.

  Next, the worker places the food F such as the open-boiled fish (salt-dried fish), open fish (eel, eel, etc.) on the upper surface 20a of the conveyor 20 one after another before the carry-in port 11a. Also in this case, since the upper surface 20a side of the conveyor 20 is moving from the front side to the back side, that is, from the right side to the left side in FIGS. 2 and 3, the food F placed on the upper surface 20a of the conveyor 20 is It is heated by the upper electric heater UH2 and the lower electric heaters LH1, LH3, and is successively carried out from the carry-out port 11b. Thereafter, the operator picks up the food F carried out from the carry-out port 11 b one after another from the upper surface 20 a of the conveyor 20. In the third operation mode, the heating capacity of the upper electric heater UH2 and the lower electric heaters LH1 and LH3 for the food F are all the same, so the ratio of the heating degree of the upper surface and the lower surface of the food F is approximately 1 to 2. Become.

  When the heat treatment of the food F in the first to third operation modes is completed, the worker returns the first and / or second switches 36 and 38 in the on state to the off state, and the operation switch 32 is also turned on. Return to the off state. As a result, the energization of the exciting coils 37a, 39a is released, and the relay switches 37b, 37c, 37d, 39b, 39c, 39d are also turned off, and the upper electric heaters UH1, UH2, UH3 and the lower electric heaters LH1, LH2 , Power supply via the power supply lines PW1a, PW2a, PW3a, PW1b, PW2b, PW3b to LH3 is stopped, and heat generation of the upper electric heaters UH1, UH2, UH3 and lower electric heaters LH1, LH2, LH3 is stopped. . Further, the energization of the exciting coil 35a is also released, the relay switches 35b, 35c, and 35d are turned off, and the power supply lines PW1, PW2, and PW3 to the cooling fan FM, the speed controller circuit SC, and the drive motor GM are used. Power supply is also stopped, and the operations of the cooling fan FM, the speed controller circuit SC, and the drive motor GM are also stopped. Further, the main power switch 31 is also returned to the off state as necessary. As a result, the operation of the conveyor type food heating device is completed.

  In the above-described embodiment that operates as described above, when the heating degree of the upper surface and the lower surface of the food F is desired to be equal (that is, 1: 1), the first and second switches 36 and 38 are simultaneously turned on. Good. In addition, when the degree of heating of the upper surface of the food F is desired to be higher (that is, 2 to 1) than that of the lower surface, only the first switch 36 of the first and second switches 36 and 38 is turned on. What is necessary is just to make the heating degree of the upper surface of the food F lower than the heating degree of the lower surface (that is, 1 to 2, in other words, the heating degree of the lower surface of the food F is higher than the heating degree of the upper surface of the food F). Only the second switch 38 of the first and second switches 36 and 38 needs to be turned on. As a result, according to the above-described embodiment, the heating degree of the upper surface and the lower surface of the three types of food F can be selected by a simple operation, and the first and first heating degrees can be selected for selecting the three heating degrees. Since only two switches 36 and 38 and electromagnetic contactors 37 and 39 need be provided, a conveyor type food heating apparatus capable of selecting the above three heating degrees can be easily configured.

  In the above embodiment, the upper electric heaters UH1, UH2, UH3 and the lower electric heaters LH1, LH2, LH3 are energized and controlled in the first operation mode, and the upper electric heaters UH1, UH3, and The lower electric heater LH2 is energized and the upper electric heater UH2 and the lower electric heaters LH1 and LH3 are energized in the third operation mode. Thus, when the second operation mode and the third operation mode are selectively used, the same electric heater is not always energized and the upper electric heaters UH1, UH2, UH3 and the lower electric heater LH1, are not controlled. The tendency for LH2 and LH3 to operate equally increases. As a result, according to the said embodiment, it can avoid raising the frequency of use of a specific electric heater extremely compared with another electric heater. If the use frequency in the second operation mode and the use frequency in the third operation mode are appropriate, the use time of all the upper electric heaters UH1, UH2, UH3 and the lower electric heaters LH1, LH2, LH3 is large. A difference will not occur, and even if the upper electric heaters UH1, UH2, UH3 and the lower electric heaters LH1, LH2, LH3 are exchanged at the same time, no great waste will occur.

  In particular, in the above-described embodiment, the upper electric heaters UH1, UH2, UH3 and the lower electric heaters LH1, LH2, LH3 are provided three by three, and the electric heaters used in the second and third operation modes are overlapped. Since this is avoided, the above effect can be achieved with a simple configuration. In addition, since the three electric heaters composed of the upper electric heaters UH1, UH3 and the lower electric heater LH2 and the three electric heaters composed of the upper electric heater UH2 and the lower electric heaters LH1, LH3 are delta-connected, Application to a three-phase AC power supply is simplified.

  In the above embodiment, the upper electric heaters LH1, LH2, and LH3 are provided with protective covers 17-1, 17-2, and 17-3 for avoiding falling objects from the food F. The distance Lup from the electric heaters UH1, UH2, UH3 to the upper surface 20a of the conveyor 20 is made larger than the distance Ldw from the lower electric heaters LH1, LH2, LH3 to the upper surface 20a of the conveyor 20, and is conveyed by the conveyor 20. The heating capacity of the upper electric heaters UH1, UH2, and UH3 and the heating capacity of the lower electric heaters LH1, LH2, and LH3 for the food F are equalized, so that the upper electric heaters UH1, UH2, UH3 and the lower electric heater LH1, LH2 and LH3 can contribute to food F equally.

  The implementation of the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the object of the present invention.

a. 1st modification In the said embodiment, although the conveyor type food heating apparatus using three-phase alternating current power was demonstrated, it is also possible to change this conveyor type food heating apparatus so that two phase alternating current power may be used. . The conveyor type food heating apparatus according to the first modification of the embodiment using the two-phase AC power will be described. FIG. 8 relates to the first modification, and is accommodated in the control box 12 of the embodiment. 2 is a block diagram of the electric control device 40. In addition, in the conveyor type food heating apparatus according to the first modification, the electric control device 40 part is different from the conveyor type food heating apparatus according to the above embodiment, and other parts are the same as in the above embodiment. About the same part, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  The electric control device 40 includes two power supply lines L1 and L2 connected to a commercial two-phase AC power supply line, and a main power supply that opens and closes the commercial two-phase AC power supply line and the power supply lines L1 and L2. A switch 41 is provided. On the output side of the main power switch 41, an operation switch 42 is provided for switching the power supply lines L1 and L2 between the energized state and the non-energized state. The power supply line L2 is provided with a temperature fuse 33 and an overheat prevention thermostat 34 similar to those in the above embodiment. Further, a cooling fan FM, a drive motor GM, and a speed controller circuit SC similar to those in the above embodiment are also provided between the power supply lines L1 and L2.

  The power supply lines L1 and L2 are connected to the power supply lines L1a and L2a for supplying power to the upper electric heaters UH1 and UH3 and the lower electric heater LH2, and the upper electric heater UH2 and the lower electric heat. The power supply lines L1b and L2b for supplying power to the heaters LH1 and LH3 are branched. The upper electric heaters UH1, UH2, UH3 and the lower electric heaters LH1, LH2, LH3 are also configured in the same manner as in the above embodiment, but the upper electric heaters UH1, UH3 and the lower electric heater LH2 are two-phase power supply lines. Connected between L1a and L2a, the upper electric heater UH2 and the lower electric heaters LH1 and LH3 are connected between the two-phase power supply lines L1b and L2b.

  Further, in the electric control device 40 of the conveyor type food heating apparatus according to the first modification, the first switch 45 corresponding to the first switch 36 of the above embodiment is interposed in the power supply lines L1a and L2a and is turned off. In the state, the power supply to the upper electric heaters UH1, UH3 and the lower electric heater LH2 is stopped, and the upper electric heaters UH1, UH3 and the lower electric heater LH2 are supplied with an ON operation. The second switch 46 corresponding to the second switch 38 of the above embodiment is interposed in the power supply lines L1b, L2b, and stops power supply to the upper electric heater UH2 and the lower electric heaters LH1, LH3 in the off state, Power is supplied to the upper electric heater UH2 and the lower electric heaters LH1 and LH3 by the ON operation.

  Also in the conveyor type food heating apparatus according to the first modification configured as described above, the operation of the apparatus is started by turning on the main power switch 41 and the operation switch 42. If the first and second switches 45 and 46 are simultaneously turned on, the upper electric heaters UH1 and UH3 and the lower electric heater LH2 are supplied with power through the power supply lines L1a and L2a, and the upper electric heater UH2 and The lower electric heaters LH1 and LH3 are fed via power supply lines L1b and L2b, and the upper electric heaters UH1 and UH3 and the lower electric heater LH2 generate heat, and the upper electric heater UH2 and the lower electric heaters LH1 and LH3. Even fever. Therefore, the first operation mode in the above embodiment is realized by simultaneously turning on the first and second switches 45 and 46.

  If only the first switch 45 of the first and second switches 45 and 46 is turned on, the upper electric heaters UH1 and UH3 and the lower electric heater LH2 are supplied with power through the power supply lines L1a and L2a. However, the upper electric heater UH2 and the lower electric heaters LH1, LH3 are not supplied with power, and only the upper electric heaters UH1, UH3 and the lower electric heater LH2 generate heat. Therefore, the second operation mode in the above embodiment is realized by turning on only the first switch 45. Further, if only the second switch 46 of the first and second switches 45 and 46 is turned on, the upper electric heater UH2 and the lower electric heaters LH1 and LH3 are supplied with power through the power supply lines L1b and L2b. However, the upper electric heaters UH1 and UH3 and the lower electric heater LH2 are not supplied with power, and only the upper electric heater UH2 and the lower electric heaters LH1 and LH3 generate heat. Therefore, the third operation mode in the above embodiment is realized by turning on only the second switch 46.

  Thus, also in the said 1st modification, it replaces with a three-phase alternating current, and operate | moves similarly to the said embodiment except the point using a two-phase alternating current. Therefore, also according to the first modification, the same effects as those in the above embodiment are expected except for matters relating to the three-phase alternating current.

b. Second Modification In the above embodiment and the first modification, three upper electric heaters UH1, UH2, UH3 and three lower electric heaters LH1, LH2, LH3 are provided. UH3 and lower electric heater LH3 may be omitted, and two upper electric heaters UH1 and UH2 and lower electric heaters LH1 and LH2 may be provided. The conveyor-type food heating apparatus according to the second modified example thus modified will be described. FIG. 9 relates to the second modified example, and the electricity housed in the control box 12 of the embodiment and the first modified example. 2 is a block diagram of a control device 40. FIG. In this case, the first and second switches 51 and 53 corresponding to the first and second switches 45 and 46 in the first modification of FIG. 8 and the upper electric heaters UH1 and UH2 and the lower electric heaters LH1 and LH2 are used. The power supply lines L1a, L2a, L1b, and L2b may be connected differently. The power supply lines L1a and L2a and the power supply lines L1b and L2b are power supply lines branched from the power supply lines L1 and L2 connected to the commercial two-phase AC power supply line, respectively. It should be noted that the horizontal intervals along the moving direction of the upper surface 20a of the conveyor 20 of the upper electric heaters UH1 and UH2 and the lower electric heaters LH1 and LH2 may be appropriately set by reducing the number of electric heaters. Other configurations are the same as those of the first modification.

  In the second modification, as shown in FIG. 9, the first switch 51 and the exciting coil 52a of the electromagnetic contactor 52 are connected in series between the power supply lines L1a and L2a. The first switch 51 is turned on in the first and second operation modes, and opens and closes the electromagnetic contactor 52 by the on / off operation. The electromagnetic contactor 52 turns off the relay switches 52b, 52c, 52d, and 52e when the exciting coil 52a is not energized, and turns on the relay switches 52b, 52c, 52d, and 52e when the exciting coil 52a is energized. One end of each of the relay switches 52b, 52c, 52d is connected to the power supply line L1a, and the other end of each of the relay switches 52b, 52c, 52d is connected to one end of each of the upper electric heaters UH1, UH2 and the lower electric heater LH1. Yes. One end of the relay switch 52e is connected to the power supply line L2a, and the other end of the relay switch 52e is connected to the other ends of the upper electric heaters UH1 and UH2 and the lower electric heaters LH1 and LH2.

  The second switch 53 and the exciting coil 54a of the electromagnetic contactor 54 are connected in series between the power supply lines L1b and L2b. The second switch 53 is turned on in the first and third operation modes, and opens and closes the electromagnetic contactor 54 by the on / off operation. The electromagnetic contactor 54 turns off the relay switches 54b, 54c, 54d, and 54e when the exciting coil 54a is not energized, and turns on the relay switches 54b, 54c, 54d, and 54e when the exciting coil 54a is energized. One end of each of the relay switches 54b, 54c, 54d is connected to the power supply line L1b, and the other end of each of the relay switches 54b, 54c, 54d is connected to one end of each of the upper electric heater UH1 and the lower electric heaters LH1, LH2. Yes. One end of the relay switch 54e is connected to the power supply line L2b, and the other end of the relay switch 54e is connected to the other ends of the upper electric heaters UH1 and UH2 and the lower electric heaters LH1 and LH2.

  In the second modified example configured as described above, similarly to the first modified example, if the first and second switches 51 and 53 are simultaneously turned on in a state where the operation of the apparatus is started, the exciting coil 52a. , 54a are energized, and relay switches 52b, 52c, 52d, 52e and relay switches 54b, 54c, 54d, 54e are turned on. Thus, the upper electric heaters UH1 and UH2 and the lower electric heaters LH1 and LH2 are supplied with power via the power supply lines L1a, L2a, L1b and L2b, and the upper electric heaters UH1 and UH2 and the lower electric heaters LH1 and LH2 are Fever. Therefore, when the first and second switches 51 and 53 are simultaneously turned on, the upper and lower surfaces of the food F are heated at substantially the same ratio (one to one).

  Further, if only the first switch 51 of the first and second switches 51, 53 is turned on, the upper electric heaters UH1, UH2 and the lower electric heater LH1 are connected to the power supply lines L1a, L1 by energization of the exciting coil 52a. Power is supplied through L2a, but the lower electric heater LH2 is not supplied with power, and only the upper electric heaters UH1 and UH2 and the lower electric heater LH1 generate heat. Therefore, the upper surface and the lower surface of the food F are heated at a ratio of approximately 2: 1 by turning on only the first switch 51. Further, if only the second switch 53 of the first and second switches 51, 53 is turned on, the upper electric heater UH1 and the lower electric heaters LH1, LH2 are supplied with power via the power supply lines L1b, L2b. However, the upper electric heater UH2 is not supplied with power, and only the upper electric heater UH1 and the lower electric heaters LH1 and LH2 generate heat. Therefore, the upper surface and the lower surface of the food F are heated at a ratio of approximately 1: 2 by turning on only the second switch 53.

  As a result, also in the second modified example, the heating ratio of the upper surface and the lower surface of the food F is selected to be approximately 1 to 1, 2 to 1, or 1 to 2 by the selection operation of the first and second switches 51 and 53. Therefore, the same degree of heating can be set as in the first to third operation modes of the embodiment and the first modification, and the same effect as in the case of the embodiment and the first modification can be expected. The However, in this case, in the first to third operation modes, the upper electric heater UH1 and the lower electric heater LH1 are always energized and generate heat. However, the upper electric heater UH2 is energized and generates heat only in the first and second operation modes, and the lower electric heater LH2 is energized and generates heat only in the first and third operation modes. Therefore, in the second modification, the upper electric heater UH1 and the lower electric heater LH1 tend to be used more frequently than the upper electric heater UH2 and the lower electric heater LH2, and the upper electric heaters UH1 and UH2 The usage times of the side electric heaters LH1 and LH2 are not equal as in the case of the above embodiment and the first modification.

c. Third Modification Next, in the first modification of FIG. 8, the number of the upper electric heaters and the lower electric heaters is increased by one, and four upper electric heaters UH1, UH2, UH3, UH4 and lower A third modification example in which the side electric heaters LH1, LH2, LH3, and LH4 are provided will be described. The upper electric heaters UH1, UH2, UH3, UH4 and the lower electric heaters LH1, LH2, LH3, LH4 are respectively arranged at equal intervals in the horizontal direction above and below the upper surface 20a of the conveyor 20. It is arranged along the moving direction of 20a.

  The conveyor type food heating apparatus according to the third modification will be described. FIG. 10 is a block diagram of the electric control apparatus 40 accommodated in the control box 12 of the above embodiment according to the third modification. In the third modification, upper electric heaters UH1, UH2, UH4 and a lower electric heater LH3 are connected between the power supply lines L1a, L2a on the output side of the first switch 45. Further, an upper electric heater UH3 and lower electric heaters LH1, LH2, and LH4 are connected between the power supply lines L1b and L2b on the output side of the second switch 46. Other configurations are the same as those of the first modification of FIG.

  In the conveyor type food heating apparatus according to the third modified example configured as described above, the first and second switches 45 and 46 are simultaneously turned on while the operation of the apparatus is started, as in the first modified example. When operated, the upper electric heaters UH1, UH2, UH4 and the lower electric heater LH3 are supplied with power through the power supply lines L1a, L2a, and the upper electric heater UH3 and the lower electric heaters LH1, LH2, LH4 are supplied with electric power. Power is supplied through the lines L1b and L2b, and all the electric heaters of the upper electric heaters UH1, UH2, UH3 and UH4 and the lower electric heaters LH1, LH2, LH3 and LH4 generate heat. Therefore, when the first and second switches 45 and 46 are simultaneously turned on, the upper surface and the lower surface of the food F are heated at substantially the same ratio (approximately 1: 1).

  If only the first switch 45 of the first and second switches 45, 46 is turned on, the upper electric heaters UH1, UH2, UH4 and the lower electric heater LH3 are fed via the power supply lines L1a, L2a. However, the upper electric heater UH3 and the lower electric heaters LH1, LH2, and LH4 are not supplied with power, and only the upper electric heaters UH1, UH2, UH4, and the lower electric heater LH3 generate heat. Accordingly, by turning on only the first switch 45, the upper and lower surfaces of the food F are heated at a ratio of approximately 3 to 1. If only the second switch 46 of the first and second switches 45, 46 is turned on, the upper electric heater UH3 and the lower electric heaters LH1, LH2, LH4 are fed via the power supply lines L1b, L2b. However, the upper electric heaters UH1, UH2, UH4 and the lower electric heater LH3 are not supplied with power, and only the upper electric heater UH3 and the lower electric heaters LH1, LH2, LH4 generate heat. Therefore, the upper surface and the lower surface of the food F are heated at a ratio of about 1: 3 by turning on only the second switch 46.

  As a result, also in the third modified example, the heating ratio of the upper surface and the lower surface of the food F is selectively set to a different predetermined ratio by the selection operation of the first and second switches 45 and 46. The heating degree similar to the first to third operation modes of the form and the first modification can be set, and the same effect as in the case of the above embodiment and the first modification is expected. However, in this case, unlike the case of the above embodiment and the first modification, the heating ratio of the upper surface and the lower surface of the food F in the first to third operation modes is approximately 1: 1, 3: 1 and 1 pair. It becomes 3. In the third modification, the upper electric heaters UH1, UH2, UH4 and the lower electric heater LH3 are energized to generate heat in the second operation mode, and the upper side different from the second operation mode in the third operation mode. Since the electric heater UH3 and the lower electric heaters LH1, LH2, and LH4 are energized to generate heat, the upper electric heaters UH1, UH2, UH3, UH4 and the lower electric heaters LH1, LH2, LH3, and LH4 are used as described above. As in the case of the form and the first modification, they tend to be equal to each other.

d. Fourth Modified Example Next, as in the third modified example, a conveyor type food heating apparatus provided with four upper electric heaters UH1, UH2, UH3, UH4 and lower electric heaters LH1, LH2, LH3, LH4. In the first to third operation modes, the heating ratio between the upper surface and the lower surface of the food F is approximately 1: 1, 2: 1, and 1 as in the case of the above-described embodiment and the first and second modifications. A description will be given of a fourth modification example in which the pair 2 is provided.

  FIG. 11 is a block diagram of the electric control device 40 of the conveyor type food heating apparatus according to the fourth modification. Also in the fourth modified example, the first switch 55 and the exciting coil 56a of the electromagnetic contactor 56 are connected in series between the power supply lines L1a and L2a, as in the second modified example of FIG. ing. The first switch 55 is turned on in the first and second operation modes, and opens and closes the electromagnetic contactor 56 by the on / off operation. The electromagnetic contactor 56 turns off the relay switches 56b, 56c, 56d, 56e, 56f, 56g, and 56h when the exciting coil 56a is not energized, and the relay switches 56b, 56c, 56d, and so on are energized by the exciting coil 52a. 56e, 56f, 56g, and 56h are turned on. One end of each of the relay switches 56b, 56c, 56d, 56e, 56f, and 56g is connected to the power supply line L1a, and the other end of each of the relay switches 56b, 56c, 56d, 56e, 56f, and 56g is connected to the upper electric heaters UH1, UH2, UH3 and UH4 are connected to one ends of lower electric heaters LH1 and LH3, respectively. One end of the relay switch 56h is connected to the power supply line L2a, and the other end of the relay switch 56h is connected to the other ends of the upper electric heaters UH1, UH2, UH3, UH4 and the lower electric heaters LH1, LH2, LH3, LH4, respectively. Has been.

  The second switch 57 and the exciting coil 58a of the electromagnetic contactor 58 are connected in series between the power supply lines L1b and L2b. The second switch 57 is turned on in the first and third operation modes, and opens and closes the electromagnetic contactor 58 by the on / off operation. The electromagnetic contactor 58 turns off the relay switches 58b, 58c, 58d, 58e, 58f, 58g, and 58h when the exciting coil 58a is not energized, and the relay switches 58b, 58c, 58d, and so on are energized by the exciting coil 58a. 58e, 58f, 58g and 58h are turned on. One end of each of the relay switches 58b, 58c, 58d, 58e, 58f, and 58g is connected to the power supply line L1b, and the other end of each of the relay switches 58b, 58c, 58d, 58e, 58f, and 58g is connected to the upper electric heaters UH1, UH3, and The lower electric heaters LH1, LH2, LH3, and LH4 are respectively connected to one ends. One end of the relay switch 58h is connected to the power supply line L2b, and the other end of the relay switch 58h is connected to the other ends of the upper electric heaters UH1, UH2, UH3, UH4 and the lower electric heaters LH1, LH2, LH3, LH4, respectively. Has been.

  In the fourth modified example configured as described above, similarly to the second modified example, if the first and second switches 55 and 56 are simultaneously turned on in the state where the operation of the apparatus is started, the exciting coil 56a. , 58a are energized, and the relay switches 56b, 56c, 56d, 56e, 56f, 56g, 56h and the relay switches 58b, 58c, 58d, 58e, 58f, 58g, 58h are turned on. Thus, the upper electric heaters UH1, UH2, UH3, UH4 and the lower electric heaters LH1, LH2, LH3, LH4 are supplied with power via the power supply lines L1a, L2a, L1b, L2b, and the upper electric heaters UH1, UH2, UH3, UH4 and lower electric heaters LH1, LH2, LH3, LH4 generate heat. Therefore, when the first and second switches 51 and 53 are simultaneously turned on, the upper surface and the lower surface of the food F are heated at substantially the same ratio (approximately one to one).

  If only the first switch 55 of the first and second switches 55, 57 is turned on, the upper electric heaters UH1, UH2, UH3, UH4 and the lower electric heaters LH1, LH3 are energized by energization of the exciting coil 56a. Is supplied through the power supply lines L1a and L2a, but the lower electric heaters LH2 and LH4 are not supplied with power, and only the upper electric heaters UH1, UH2, UH3 and UH4 and the lower electric heaters LH1 and LH3 generate heat. Therefore, the upper surface and the lower surface of the food F are heated at a ratio of approximately 2: 1 by turning on only the first switch 55. Further, if only the second switch 57 of the first and second switches 55, 57 is turned on, the upper electric heaters UH1, UH3 and the lower electric heaters LH1, LH2, LH3, LH4 are supplied to the power supply lines L1b, L2b. However, the upper electric heaters UH2 and UH4 are not supplied with power, and only the upper electric heaters UH1 and UH3 and the lower electric heaters LH1, LH2, LH3 and LH4 generate heat. Therefore, the upper surface and the lower surface of the food F are heated at a ratio of approximately 1: 2 by turning on only the second switch 57.

  As a result, also in the fourth modification, the heating ratio of the upper surface and the lower surface of the food F is selected to be approximately 1: 1, 2: 1, or 1: 2 by the selection operation of the first and second switches 55, 57. Therefore, it is possible to set the same degree of heating as in the first to third operation modes of the above embodiment, the first and second modifications, and the case of the above embodiment, the first and second modifications. A similar effect is expected. However, in this case, in the first to third operation modes, the upper electric heaters UH1, UH3 and the lower electric heaters LH1, LH3 are always energized to generate heat. However, the upper electric heaters UH2 and UH4 are energized and generate heat only in the first and second operation modes, and the lower electric heaters LH2 and LH4 are energized and generate heat only in the first and third operation modes. Accordingly, the upper electric heaters UH1, UH3 and the lower electric heaters LH1, LH3 tend to be used more frequently than the upper electric heaters UH2, UH4 and the lower electric heaters LH2, UH4, and the upper electric heaters UH1, UH2, The usage time of UH3, UH4 and lower electric heaters LH1, LH2, LH3, LH4 is not equal as in the case of the above-described embodiment, the first and third modifications.

e. Other Modifications In the above-described embodiment and the above-described various modifications, the example in which the upper electric heater and the lower electric heater are provided in two, three, and four respectively has been described. An upper electric heater and a lower electric heater may be provided one by one.

  Moreover, in the said embodiment and the said various modifications, although the glass tube type far-infrared heater which enclosed the carbon filament in the quartz glass tube with the inert gas was used as an electric heater, the heater with the high radiation amount of far infrared rays was used. If it is, it can use without being limited to this. Further, since the far infrared heater is used as the electric heater, the rise time of the electric heater is short and the time to reach the maximum temperature is short. However, if this time is not a problem, other electric heaters may be used. For example, various heaters such as a sheathed heater, a ceramic heater, and a halogen heater can be used.

  Moreover, in the said embodiment and various modifications, the upper surface 20a of the conveyor 20 was extended in the horizontal direction. However, the upper surface 20a may be inclined with respect to the horizontal so that the food F placed on the upper surface 20a does not fall naturally. Furthermore, if a preventive measure for preventing the natural fall of the food F placed on the upper surface 20a is applied, for example, a stopper member, a fixing member, or the like for preventing the natural fall of the food F is provided on the upper surface of the conveyor 20. The upper surface 20a may be further inclined with respect to the horizontal.

  Moreover, also in the conveyor type food heating apparatus according to the embodiment and various modifications, as described in Patent Document 1 cited in the section of the background art, the chilled food just taken out from the refrigerator is heat-treated. For this purpose, a superheated steam ejector may be provided.

  Furthermore, the present invention is not limited to cooking of food F, and can be applied to an apparatus for performing heat drying of food as long as the food F is heat-treated. For example, food (foodstuffs) such as agricultural vegetables, mushrooms, fruits and marine seaweeds, round fish, etc., on the upper surface side and lower surface side of the food as in the first operation mode of the above embodiment and various modifications. When heated almost uniformly, a nearly uniform dry food is produced.

  In addition, a pulverized product of grain, an aqueous chiller liquid, or the like is placed in a metal container and placed on the upper surface 20a of the conveyor 20, and the upper surface side as in the second operation mode of the above embodiment and various modified examples. When the heating degree is made larger than the heating degree on the lower surface side and heating is performed while suppressing the temperature rise of the container, a substantially uniform dry food can be obtained without scorching.

  Moreover, in the case of food (foodstuff) such as open fish, the food (fish) is placed on the upper surface 20a of the conveyor 20 with the skin side facing down, and the third operation mode of the above-described embodiment and various modifications is performed. As described above, when the degree of heating on the lower surface side of the food is larger than that on the upper surface side and the skin side where heat does not easily enter is heated strongly, a substantially uniform dried dried fish can be obtained. In addition, when applied to blanched cut vegetables, when the cut vegetables are placed in a wire mesh container and placed on the upper surface 20a of the conveyor 20, the heated natural convection of heated air from the lower side causes the wire mesh to flow. The moisture removal of cut vegetables can be performed smoothly by passing. This is because light and radiant heat from below are blocked by the wire mesh container, and therefore it is suitable for uniform drying to increase the amount of heat on the lower side than on the upper side.

  Thus, if dry food is manufactured by the 1st thru / or 3rd operation modes as mentioned above using the conveyor type food heating device concerning the above-mentioned embodiment and various modifications, internal heating (surface of food) with far infrared rays 1-10 mm from the side), it is possible to produce a dry food that is suppressed in solidification and shrinkage on the surface, easily rehydrated, and has little change in the form of the food.

DESCRIPTION OF SYMBOLS 10 ... Conveyor oven main body, 11 ... Heating chamber, 17-1, 17-2, 17-3 ... Protective cover, 20 ... Conveyor, 20a ... Upper surface, 25 ... Drive roller, 30, 40 ... Electric control apparatus, 32, 42 ... Operation switch, 35, 37, 39, 52, 54, 56, 58 ... Electromagnetic contactor, 36, 45, 51, 55 ... First switch, 38, 46, 53, 57 ... Second switch, UH1, UH2, UH3, UH4 ... Upper electric heater, LH1, LH2, LH3, LH4 ... Lower electric heater, GM ... Drive motor

Claims (7)

A heating chamber for heating the food;
A conveyor for passing through the heating chamber and conveying the food placed on the upper surface;
A plurality of upper electric heaters disposed above the upper surface of the conveyor in the heating chamber;
In the conveyor type food heating apparatus provided with a plurality of lower electric heaters disposed below the upper surface of the conveyor in the heating chamber,
By turning on, at least two or more upper electric heaters among the plurality of upper electric heaters are energized at the same time, and the number of the lower electric heaters among the plurality of lower electric heaters is smaller than the number of the upper electric heaters controlled to be energized. First switch means for controlling energization of the lower electric heater simultaneously with the at least two upper electric heaters;
The on operation simultaneously controls energization of at least two or more lower electric heaters of the plurality of lower electric heaters, and more than the lower electric heaters of which the energization is controlled among the plurality of upper electric heaters. A second switch means for controlling energization of a small number of upper electric heaters simultaneously with the at least two lower electric heaters;
Conveyor type food heating, wherein all of the plurality of upper electric heaters and the plurality of lower electric heaters are energized and controlled by simultaneously turning on the first switch means and the second switch means. apparatus.   The upper electric heater controlled by the first switch means is different from the upper electric heater controlled by the second switch means, and the lower electric heater controlled by the first switch means is the two switches. 2. The conveyor type food heating apparatus according to claim 1, wherein the conveyor type food heating apparatus is different from the lower electric heater controlled to be energized by the means. Each of the plurality of lower electric heaters is provided with a protective cover for avoiding adhesion of falling objects from food between the upper surface of the conveyor,
The plurality of upper electric heaters for food conveyed by the conveyor, the distance from the plurality of upper electric heaters to the upper surface of the conveyor being larger than the distance from the plurality of lower electric heaters to the upper surface of the conveyor 3. The conveyor type food heating apparatus according to claim 1 or 2, wherein the heating capacity by the plurality of lower electric heaters is equalized.   The conveyor type food heating apparatus according to any one of claims 1 to 3, wherein the number of the plurality of upper electric heaters and the number of the lower electric heaters are the same.   5. The conveyor type food heating apparatus according to claim 4, wherein the plurality of upper electric heaters and the plurality of lower electric heaters are arranged to face each other across the upper surface of the conveyor.   The plurality of upper electric heaters are arranged at equal intervals in the movement direction of the upper surface of the conveyor, and the lower electric heaters are arranged at equal intervals in the movement direction of the upper surface of the conveyor. The conveyor type food heating apparatus described in any one of 1 to 5. The number of the plurality of upper electric heaters and the number of the lower electric heaters is three each,
The first switch means controls the energization of the two upper electric heaters on both sides sandwiching the upper electric heater at the center position among the three upper electric heaters by turning on, and the three lower electric heaters The lower electric heater at the center position is energized and controlled.
The second switch means controls the energization of the two lower electric heaters on both sides of the lower electric heater at the center position among the three lower electric heaters by turning on, and the three upper electric heaters. The food heating apparatus according to any one of claims 1 to 6, wherein the upper electric heater at the center position among the heaters is energized and controlled.

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