JPH05168392A - Tunnel oven for making confectionery and bread - Google Patents

Abstract

PURPOSE:To facilitate baking operation by igniting the upper burner and lower burner by igniting control means to preheat the inside of an oven and then extinguishing burners other than selected burners. CONSTITUTION:A material to be baked fed from an inlet table 3 to an oven 2 is carried by a conveyer 5a and taken out to an outlet table 4. The upper burner 6 and the lower burner 6 are arranged respectively above and below the conveyer 5a. All burners are ignited by igniting the upper burner and lower burner in order by an ignition control means to preheat the inside of oven, and then burners other than those selected for baking are extinguished.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a confectionery / baking tunnel oven, and more particularly to a confectionery / baking tunnel oven for baking an object to be baked with an upper burner and a lower burner.

[0002]

2. Description of the Related Art Generally, in a confectionery / baking production line,
A tunnel oven for confectionery / baking is provided, and an object to be fired (dough such as confectionery and bread) is sent into the tunnel oven for baking.

A tunnel oven for confectionery / baking is, for example, a device having a total length of more than 10 m, and roughly speaking, a tunnel oven main body composed of a plurality of baking zones, and an object to be baked are conveyed in the tunnel oven main body. It is configured by a conveyor, a plurality of burners arranged in each firing zone so as to sandwich the conveyor to perform firing of an object to be fired, other various air supply / exhaust devices, safety devices, operation panels, and the like.

The conventional confectionery / baking tunnel oven is operated by a so-called manual operation. Therefore, when activating the confectionery / baking tunnel oven having the above configuration, the operator manually ignites each of the plurality of burners one by one and visually confirms the ignition, and also when the operation is stopped. It was practiced to manually extinguish each burner and visually confirm this.

On the other hand, in recent years, various confectioneries, breads and the like have been baked in one confectionery / baking tunnel oven to meet the needs of customers. Further, when the type of the object to be fired is changed, the firing method (burner selection, etc.) must be changed according to the object to be fired. Conventionally, the firing corresponding to the type of the object to be fired has been performed depending on the experience and intuition of the operator.

[0006]

As described above, in the conventional confectionery / baking tunnel oven, since the operations such as ignition and extinguishing of the burner are manually performed, a plurality of (in the scale of the tunnel oven also It depends on 15-40 units)
Since it was necessary to check ignition, extinguishing, and ignition and extinguishing of the burner, there was a problem that the work was very troublesome.

Further, since the ignition and extinguishing work for each burner is troublesome as described above, it is difficult to manage each burner individually. For example, in the case of preheat treatment performed immediately after the start of operation of the tunnel oven. In this case, the preheating was performed by igniting only the burners corresponding to the kind of the material to be fired without igniting all the burners. As described above, when the burners are selectively ignited and preheated, the temperature inside the furnace of the tunnel oven becomes uneven, and it is known that it takes time to start up, but all the burners are ignited. Considering the complexity of the matter, preheating was performed using only the predetermined burner as described above.

The present invention has been made in view of the above points, and an object of the present invention is to provide a confectionery / baking tunnel oven which is easy to operate.

[0009]

In order to solve the above problems, according to the present invention, a plurality of upper burners and lower burners arranged above and below the carrying device while carrying the material to be fired by the carrying device. In a confectionery / baking tunnel oven configured to bake an object to be baked, an ignition device capable of independently igniting and extinguishing the plurality of upper burners and lower burners, and the plurality of upper burners and lower burners. Among them, the burner selection device that selects the burner to be burned when firing the object to be burned, and at the time of ignition, all burners are ignited and preheated by igniting the upper burner and the lower burner in a predetermined order. And an ignition control means for extinguishing a burner other than the burner selected by the burner selection device at the time of subsequent firing of the object to be fired. A.

[0010]

In the confectionery / baking tunnel oven configured as described above, since a plurality of burners can be automatically ignited and automatically extinguished by an igniter, it is not necessary to manually ignite and extinguish each burner. ..

Further, the ignition control means is configured to preheat the inside of the tunnel oven by igniting all the burners by sequentially igniting the upper burner and the lower burner at the time of ignition. The temperature in the oven can be uniformly preheated.

Further, at the time of ignition, the upper burner and the lower burner are ignited in order, so that the change of the gas flow in the tunnel oven can be moderated, which also makes it possible to reduce the change in gas flow in the furnace. The temperature can be uniformly preheated.

Further, when the preheating is completed, the ignition control means automatically extinguishes all but the predetermined burner selected by the burner setting device, and only the burner corresponding to the object to be burned burns, so that the object to be burned is burned. The firing operation can be easily performed.

[0014]

Embodiments of the present invention will now be described with reference to the drawings. FIG. 1 is a configuration diagram of a confectionery / baking tunnel oven 1 (hereinafter simply referred to as a tunnel oven) according to an embodiment of the present invention, and FIG. 2 is an external view of the tunnel oven 1.

First, a schematic structure of the tunnel oven 1 will be described with reference to FIG. In the figure, 2 is an oven main body, and in this embodiment, the oven main body 2 is composed of four baking zones 2-1, 2-2, 2-3, 2-4. Each of the firing zones 2-1, 2-2, 2-3 and 2-4 has a structure in which the temperature can be set independently, so that the firing conditions of the object to be fired can be set with a degree of freedom. Therefore, it is possible to perform firing suitable for the type of the article to be fired. In addition, an inlet table 3 for feeding the material to be baked into the oven body 2 and an outlet table 4 for taking out the baked material are arranged on the side of the oven body 2.

On the other hand, the tunnel oven 1 has a conveyor 5
a (which is driven by the conveyor driving device 5) is provided, and the conveyor 5a is configured to feed the material to be fired to the entrance table 3
Is conveyed from the oven through the oven body 2 toward the exit table 4. The operator places the material to be baked on the conveyor 5a on the entrance table 3, the material to be baked is baked in the process of passing through the oven main body 2, and the baked material to be baked is exited. It is taken out from the conveyor 5a on the table 4. In addition, what is indicated by a chain double-dashed line in the figure is the position of the conveyor 5 a in the oven main body 2. The material to be fired is conveyed in the direction of the arrow in the figure.

Further, the oven body 2 is provided with a plurality of burners 6 for firing an object to be fired. The burners 6 are arranged at predetermined upper and lower positions with the conveyor 5a sandwiched therebetween. The number and the position of the burners 6 are appropriately selected depending on the size of the tunnel oven 1 and the like.

The structure of the burner 6 will be described in detail with reference to FIG. The burner 6 has a cylindrical rod shape as shown in the figure, and is fixed by supporting both sides of the burner 6 by the oven main body 2. Further, gas is supplied from the gas supply means 14 to the connecting portion 6a formed at one end of the burner 6, and ribbon burner portions 7 are formed on both sides. Further, an ignition device 8 for igniting the gas discharged from the ribbon burner portion 7 is arranged on one side portion facing the ribbon burner portion 7, and the other side portion facing the ribbon burner portion 7 is arranged on the other side portion. Is provided with an ignition confirmation sensor 9 (the ignition device 8 and the ignition confirmation sensor 9 are not shown in FIG. 3B) for confirming that the ribbon burner portion 7 has been ignited.

Therefore, the burner 6 can be automatically ignited by driving the ignition device 8, and the ignition confirmation sensor 9 can confirm whether or not the burner 6 has been ignited reliably. Burner 6 as above
A plurality of burners 6 are provided in the oven main body 2. A plurality of burners 6 are numbered, and one burner 6 is specified by designating these numbers.

Returning to FIG. 2 again, the explanation of the tunnel oven 1 will be continued. The burner 6 configured as described above is the oven main body 2
A ceramic far-infrared radiation plate (not shown) is provided inside the burner 6 at a position opposite to the position facing the object to be fired. This ceramic far-infrared radiation plate is arranged at an appropriate distance from the material to be fired conveyed by the conveyor 5a.

By disposing the ceramic far-infrared radiation plate as described above, when the burner 6 is ignited, far-infrared radiation is emitted from the ceramic far-infrared radiation plate. Since heat conduction by far infrared rays is radiative heat conduction, the heat permeates into the inside of the material to be baked and directly heats it. The baked product can be evenly baked. Further, the surface of the object to be fired is not only fired by far infrared rays but also burned by the flame of the burner 6, so that the surface of the object to be fired can be given an appropriate burning color. Regarding the ceramic far-infrared radiation plate, Japanese Patent Application Laid-Open No. 62-
See Japanese Patent No. 239937.

In addition to the above-mentioned devices and devices, the tunnel oven 1 is provided with a damper for opening and closing the oven body 2 provided in the middle of each zone of the air supply / exhaust device 10 for exhausting the inside of the oven body 2 and the oven body 2. Damper drive device 1
1)), an abnormality detection device 12 for detecting an abnormality that occurs in the tunnel oven 1, a safety device 13 that operates when the abnormality detection device 12 detects an abnormality, etc. Is performed, and safety is improved.

The tunnel oven 1 according to the present invention is characterized in that the above-mentioned devices and apparatuses are collectively controlled by the firing control device 15. The firing control device 15 will be described with reference to FIG.

FIG. 1 is a block diagram showing the control system of the tunnel oven 1. The firing control device 15 is composed of a microcomputer. The microcomputer includes a central processing circuit (CPU), a read only memory (R).
OM), a random access memory (RAM), an interface (I / O) for connecting the microcomputer to an external device, a bus for carrying data in the microcomputer, and the like.

The firing control device 15 having the above-mentioned configuration includes the ignition device 8, the ignition confirmation sensor 9, the air supply / exhaust device 10, the damper drive device 11, the abnormality detection device 12, and the safety device 1 described above.
3, gas supply device 14 and the like are connected. In addition to this, the firing control device 15 has a keyboard 16 for inputting various data, a display 17 for displaying a processing state of the firing control device 15 and occurrence of an abnormality, a floppy disk device for storing data, and the like. External storage device 1
8 is connected.

In the tunnel oven 1 having the above structure,
The ignition control means is configured as a software program of the firing control device 15. The ignition control operation performed by the firing control device 15 will be described below with reference to FIGS. 4 to 6.

When the tunnel oven 1 is operated,
It has a configuration that allows selection of three types of operation modes: automatic operation mode, manual operation mode, and personal computer operation mode. Here, the automatic operation mode is a mode in which an object to be fired is automatically fired by an automatic operation program stored in the ROM of the firing control device 15.
Further, the manual operation mode is a mode in which the burner is ignited by the push button operation and the firing process is manually performed. Furthermore, the personal computer operating mode is especially the tunnel oven 1
This is a mode used for remote control or maintenance using a telephone line.

FIG. 4 is a flow chart showing the processing for selecting the operation mode. The operation mode is selected using the keyboard 16. In step 100 (hereinafter step is abbreviated as S) in the figure, a desired operation mode is selected from the keyboard 16. The firing control device 15 determines whether the operation mode selected in S105 is the automatic operation mode, and if it is the automatic operation mode, switches the operation mode to the automatic operation mode in S110. If it is determined in S105 that the operation mode is not the automatic operation mode, it is determined whether the operation mode selected in S115 is the manual operation mode. If the operation mode is the manual operation mode, the operation mode is switched to the manual operation mode in S120. S1 if not in manual operation mode
At 25, the operation mode is switched to the personal computer operation mode.
Since the present invention has a feature in the automatic operation mode, the following description will be continued assuming that the automatic operation mode is selected.

FIG. 5 is a flowchart showing the processing operation of the firing control device 15 when the automatic operation mode is selected.

When the automatic operation processing shown in the figure is started, the firing control device 15 causes the tunnel oven 1 in S200.
It is determined whether the start switch (main switch) of is turned on. This start switch is a main switch that supplies power to each of the devices and apparatuses that make up the tunnel oven 1. Therefore, if the start switch is not turned on, the baking process cannot be performed, and the process ends.

When it is determined in S200 that the start switch has been turned on, the process proceeds to S205, and it is determined whether or not any abnormality has occurred in each of the devices and apparatuses that make up the tunnel oven 1. This abnormality detection is performed using the abnormality detection device 12 described above. Specific items for detecting abnormalities include abnormality detection of the conveyor drive device 5, the air supply / exhaust device 10, the damper drive device 11, the gas supply device 14, etc., pressure check in each pipe, and leak checker of each valve device. Various abnormalities are detected.

When an abnormality is detected in S205, the firing control device 15 does not perform the firing process after S210, displays the location of the abnormality on the display 17 in S285, and ends the process. In this way, the safety of the tunnel oven 1 is improved by performing the abnormality detection before the baking process. It should be noted that the abnormality detection device 12 is operating even during the firing process, and even when an abnormality occurs during the firing process, the firing control device 15
Is configured to drive the safety device 13 to perform safety processing.

If no abnormality is detected in S205,
The process proceeds to S210, and various data necessary for firing the object to be fired are input. The data input here include, for example, the firing temperature of each firing zone 2-1 to 2-4, the preheating temperature, the convey speed of the conveyor 5a, the burner used, the opening degree of the damper, the brand of the article to be fired, etc. is there. These data are input through the keyboard 16 while looking at the display 17.

FIG. 7 shows the display contents of the display 17 when the above data is input. In the figure,
(A) shows the screen before the data input processing, and (B) shows the screen after the data input processing. As shown in the figure, data can be input easily because it is written in the required position at the specified position in the schematic diagram of the tunnel oven displayed on the screen. You can The screen shown in FIG. 7 is a screen when the number of burners is 17 and the number of firing zones is 3.

The data input as described above can be registered as brand data. When firing the same object to be fired again, if only the brand is input, data input such as firing temperature can be omitted. You can This data input method is called a brand data input method, and the details of this brand data input method will be described later.

When predetermined data is input in S210,
In subsequent S215, it is determined whether or not the burner to be used during firing has been selected. If the burner has already been selected in S210, the process proceeds to S225. If no burner has been selected, the burner is selected in S220 and then the process proceeds to S225.

In S225, the air supply / exhaust device 10 is started,
In subsequent S230, the gas supply device is activated to prepare for firing. Further, in S235, the variable N used to ignite the plurality of burners 6 in a predetermined order is set to 1.

In S240, the burner 6 having the number corresponding to the number of the variable N (the initial number is 1 in S235) is ignited. The ignition of the burner 6 is performed by the firing control device 15
Is performed by driving the ignition device 8 arranged in the burner 6 whose number corresponds to the number of variables N.

As described above, a number is given to each of the plurality of burners 6, and the order of ignition and the number of this burner 6 are configured to correspond to each other. In order to evenly preheat the inside of the oven body 2, first the upper burner of the first firing zone 2-1 is ignited, then the lower burner of the first firing zone 2-1 is ignited, and then the It is known that the upper burner of the second firing zone 2-2 is ignited, the lower burner of the second firing zone 2-2 is then ignited, and the same ignition is sequentially performed in each subsequent firing zone. ing. The number of the plurality of burners 6 is selected so as to correspond to the order in which this preheating can be efficiently performed (see FIG. 7). Therefore, by igniting the burners 6 in the order of the numbers given in advance, it is possible to uniformly preheat the inside of the oven main body 2.

When the burner 6 having a predetermined number is ignited in S240, the ignition confirmation sensor 9 is used in S245 to confirm whether or not the burner 6 is actually ignited.
When it is determined that the burner 6 is not ignited, the subsequent ignition process is not performed, the gas supply device 14 is stopped in S290, and the gas supply is stopped.
At, the display 17 indicates that the burner 6 has not ignited, and the process ends. Therefore, it is not necessary to manually check the ignition failure of the burner 6, and when the ignition failure occurs, the gas supply device 14 is automatically stopped so that the safety can be improved.

If it is determined in S245 that the ignition is normally performed, the process proceeds to S250, where the variable N is the oven body 2
Whether a burner number N ₀ that is arranged is determined within the case of N ≠ N ₀ treatment is incremented by 1 the variable N in S255 is returned to S240. S240 ~ S
By the processing of 255, the burners 6 are ignited in the order of the numbers given in advance, so that the oven main body 2 can be uniformly preheated as described above.

In subsequent S260, the state where all the burners 6 are ignited is continued up to a predetermined preheating upper limit temperature.
Thus, the reason why all the burners 6 are ignited up to the predetermined upper limit temperature for preheating is to ensure preheating.

When the predetermined preheating upper limit temperature set by the process of S260 is reached, in S265, burners other than the burner preselected in S210 are extinguished in accordance with the type of the object to be fired. As a result, the oven main body 2 is brought into a state in which a baking process according to the type of the object to be baked can be performed.
In subsequent S270, the conveyor driving device 5 is adjusted to adjust the speed of the conveyor 5a, and in S275, the damper driving device 11 is adjusted to bring the object to be baked into the oven body 2. When the above firing preparation process is completed, the firing process of the object to be fired is started in S280.

As described above, in the automatic operation mode, only the predetermined data is input in S205, and thereafter the firing controller 15 performs the processes of automatic ignition, automatic preheating, and automatic firing. .. Therefore, since each of the plurality of burners 6 can be automatically ignited and automatically extinguished, the work of manually igniting and extinguishing each burner becomes unnecessary, and labor saving and improvement of work efficiency of the firing work can be achieved. In addition, since each burner ignites in a predetermined order at the time of ignition, it is possible to uniformly preheat the inside of the oven main body 2 and to gently change the gas flow inside the oven main body 2. .. Further, when the preheating is completed, excluding the predetermined burner selected in S210, the fire is automatically extinguished, and only the burner corresponding to the object to be burned burns, so that the object to be fired can be easily burned.

Next, the brand data input method described in S210 will be described. As described above, the tunnel oven 1 according to the present invention can save labor and improve efficiency by setting the automatic operation mode.
It is necessary to perform the work of inputting data on the object to be fired 210. There are various data to be input in S210, such as the firing temperature of each firing zone 2-1 to 2-4, the preheating temperature, the conveying speed of the conveyor 5a, etc., and this input operation is quite troublesome.

On the other hand, in a confectionery / baking line, the same baking object is often baked repeatedly, and the same baking object has the same data necessary for baking. Therefore, the data can be registered (stored) collectively using the brand of the product to be burned as an address, and the data can be entered automatically by simply designating the brand during firing. Can be done on a regular basis. The issue data input method is a method that realizes this.

FIG. 6A shows the processing at the time of brand data registration. In S300, input processing of data required for firing corresponding to the article to be fired is performed. The input process performed here is the same as the input process of S210 shown in FIG. 5, and the data is not input again. Continued S30
In 5, the firing control device 15 causes the operator to select whether the entered data is registered as brand data or not registered. This operator specifies whether to register with the keyboard 16.

When it is specified in S305 that the brand data is registered, the firing control device 15 stores the data input in S310 in the external storage device 18 using the brand (“Castella” in the case of FIG. 7) as an address. In the subsequent S315, the RAM of the firing control device 15 configured with the same data as a microcomputer
Store in. On the other hand, if it is specified in S305 that the brand data is not registered, the process of S310 is not performed and the process of S315 is directly performed.

The firing process of the tunnel oven 1 is RAM
The CPU sequentially reads the data stored in the CPU and performs firing control. However, the data stored in the RAM is erased by stopping the power supply to the firing control device 15. On the other hand, the external storage device 1
The data stored in 8 maintains the stored state even after the power supply to the firing control device 15 is stopped. Therefore, even when the firing control device 15 is activated again after the power supply to the firing control device 15 is stopped, the data input in S300 can be read from the external storage device 18.

FIG. 7B shows the processing when calling the brand data. The process shown in the figure is S2 of FIG.
This is a process executed instead of 10. When calling the brand data, it is first determined in S400 whether or not the brand has been selected. The processing of S400 is executed only when the brand data is registered, and when it is not registered, the normal processing of S210 in FIG. 5 is executed.

When the brand is selected in S400, in the subsequent S405, the firing control device 15 causes the external storage device 1 to operate.
From S8, read the data corresponding to the issue, S41
This read data at 0
It is stored in the RAM. Therefore, when the brand is registered, all the data necessary for firing the material to be fired of the relevant brand is input to the firing control device 15 simply by inputting the brand, so that the data input process is facilitated. I can do it. If there is no stock selection in S400, S
The processing ends without performing the processing of 405 and S410.

[0052]

As described above, according to the present invention, since a plurality of burners can be automatically ignited and automatically extinguished by an igniter, it is not necessary to manually ignite and extinguish each burner, and labor can be saved. In addition, since the ignition control means ignites the upper burner and the lower burner in sequence at the time of ignition, it is possible to uniformly preheat the temperature inside the tunnel oven, and to change the gas flow in the tunnel oven. When the preheating is completed, the ignition control means automatically extinguishes all but the specified burner selected by the burner setting device, and only the burner corresponding to the object to be burned burns, so It has features such as easy firing operation of the fired product.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a confectionery / baking tunnel oven that is an embodiment of the present invention.

FIG. 2 is an external view of a confectionery / baking tunnel oven that is an embodiment of the present invention.

FIG. 3 is an enlarged view showing a burner used in the present invention.

FIG. 4 is a flowchart showing a process of selecting an operation mode.

FIG. 5 is a flowchart showing a process in an automatic operation mode.

FIG. 6 is a flowchart for explaining a brand data input method.

FIG. 7 is a diagram showing a display on a display when data is input.

[Explanation of symbols]

 1 Tornel Oven 2 Oven Body 2-1 to 2-4 Firing Zone 3 Entrance Table 4 Exit Table 5 Conveyor Drive 5a Conveyor 6 Burner 7 Ribbon Burner 8 Ignition Device 9 Ignition Confirmation Sensor 10 Air Supply / Exhaust Device 11 Damper Drive Device 12 Abnormality detection device 13 Safety device 14 Gas supply device 15 Firing control device 16 Keyboard 17 Display 18 External storage device

Claims (1)

[Claims] 1. While conveying an object to be fired by a conveying device,
In a confectionery / baking tunnel oven configured to bake the object to be baked by a plurality of upper burners and a lower burner arranged above and below the transfer device, the plurality of upper burners and the lower burners are respectively provided. An ignition device capable of independently igniting and extinguishing, a burner selecting device for selecting a burner to be burned when firing the object to be fired among the plurality of upper burners and lower burners, and an upper burner and a lower burner at the time of ignition. Ignition to ignite all burners by igniting in a predetermined order to preheat, and to extinguish burners other than the burners selected by the burner selection device during subsequent firing of the object to be fired. Tunnel oven for confectionery and bread making, characterized by having a control means.