JP3657175B2 - Tunnel oven - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a tunnel oven, and more particularly to a tunnel oven in which a baking process is performed in a process in which an object to be fired moves in a conveyor.
[0002]
[Prior art]
Generally, a confectionery / breadmaking production line is provided with a tunnel oven for confectionery / breadmaking, and a baking object (dough such as confectionery or bread) is fed into the tunnel oven for baking.
[0003]
The confectionery / baking tunnel oven is, for example, an apparatus having a total length of more than 10 m, roughly speaking, an oven main body constituted by a plurality of baking zones, a conveyor for conveying an object to be baked in the oven main body, and this conveyance It is composed of a heating device for heating and baking the object to be fired in the process of being conveyed by the conveyor, various other control devices, a safety device, an operation panel, and the like.
[0004]
Further, the heating device is composed of a lower heating device disposed in the lower part of the conveying path of the object to be fired and an upper heating device disposed in the upper part. And the to-be-baked material was set as the structure by which a baking process is performed by each heating apparatus arrange | positioned up and down the conveyance path | route. Conventionally, both of the lower heating device and the upper heating device are constituted by a gas burner.
[0005]
[Problems to be solved by the invention]
However, when both the lower heating device and the upper heating device are constituted by a gas burner, the gas burner cannot be directly washed with water because of the necessity of maintaining the accuracy of the gas injection holes high. For this reason, when the residue which generate | occur | produced from to-be-baked material adheres to a gas burner, it was difficult to wash off this and there existed a problem that sanitary property fell.
[0006]
This problem is particularly noticeable in the lower heating device. That is, the residue generated from the object to be fired usually falls downward from the transport path of the object to be fired. For this reason, most of the residue generated from the object to be fired adheres to the lower heating device (lower gas burner). Therefore, the sanitary fall especially in a lower heating apparatus becomes a big problem.
[0007]
On the other hand, in the conventional configuration in which both the lower heating device and the upper heating device burn the gas to fire the object to be fired, a large amount of carbon dioxide is discharged during firing. In recent years, global warming has become a problem, and efforts are being made to reduce carbon dioxide emissions in industrial equipment in all fields. Therefore, it is necessary to reduce carbon dioxide even in a commercial confectionery / bakery tunnel oven.
[0008]
Furthermore, in recent years, there has been a demand for promotion of energy saving measures based on the Energy Use Rationalization Law (so-called Energy Saving Law). However, in the conventional configuration in which the object to be fired is simply fired by a gas burner, the heat efficiency of the heating device is poor. However, there was a problem that the above-mentioned request could not be met.
[0009]
This invention is made | formed in view of said point, and it aims at providing the tunnel oven which can aim at the response | compatibility to global warming collectively, aiming at the improvement of hygiene and energy saving.
[0010]
[Means for Solving the Problems]
In order to solve the above-described problems, the present invention is characterized by the following measures.
[0012]
  Also,Claim 1The described invention
  In the tunnel oven configured to be baked by a heating device arranged along the transfer path of the object to be baked in the process in which the object to be baked is transferred through the transfer path in the oven body by the transfer device,
  The heating device comprises hot air generating means for generating hot air, and a heating duct disposed along a conveyance path of the object to be fired,
  The hot air circulated between the hot air generating means and the heating duct so that the hot air generated by the hot air generating means returns to the hot air generating means again through the heating duct,
  In addition, an outward path and a return path as the hot air passage are formed in the heating duct, and both the forward path and the return path are provided side by side in the surface direction of the heating duct so as to face the transport path. It is characterized by.
[0013]
  Also,Claim 2The described invention
Claim 1In the described tunnel oven,
  The hot air generating means includes an electric heater.
[0014]
Each means described above operates as follows.
[0017]
  Claim 1According to the described invention,
  A forward path and a return path as hot air passages are provided in the heating duct, and the forward path and the return path are provided side by side in the surface direction of the heating duct. Become. If the forward path and the return path are configured to overlap in the vertical direction, only one hot air passage located in the upper part contributes to the firing, resulting in a decrease in thermal efficiency.
  On the other hand, when the forward path and the return path are provided in the direction of the surface of the heating duct, both hot air flowing in both the forward path and the return path contribute to the firing of the object to be fired, and the thermal efficiency is improved and the tunnel oven is improved. Energy saving can be achieved.
[0018]
  Also,Claim 2According to the described invention,
  Since the electric heater is configured to generate hot air with the electric heater provided in the hot air generating means, the electric heater does not emit carbon dioxide like the gas heater, and thus environmental problems such as global warming that have become a problem in recent years. Can deal with.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described with reference to the drawings.
[0021]
1 and 2 show the overall configuration of a tunnel oven 10 according to an embodiment of the present invention. FIG. 1 is a plan view and a front view of the tunnel oven 10, and FIG. 3 is a longitudinal sectional view of the tunnel oven 10.
[0022]
The tunnel oven 10 generally includes an oven main body 11, a transport device 12, a heating device 13, a firing temperature detection device 14, and the like. In the tunnel oven 10, the object to be fired 1 such as bread dough is placed on the transport device 12, and the material to be fired 1 is fired by the heating device 13 in the process of transporting the inside of the oven body 11 by the transport device 12. It is configured.
[0023]
Further, the tunnel oven 10 of this embodiment is configured to correspond to the HACCP (hasep = hazard analysis important control point) method. The HACCP method analyzes (HA) hazards such as microbial contamination that may occur during the processing of certain foods, and finds important control points (CCP) that need special measures to deal with them. This is a method of strengthening the monitoring there to ensure safety.
[0024]
In the HACCP method applied to the confectionery and bread making processes carried out using the tunnel oven 10, the material to be baked placed on the conveyor 25 is used for analysis (HA) of hazards such as microbial contamination. The temperature sensor 70 is inserted into 1 (see FIG. 7), the temperature change of the object to be fired 1 is measured at the time of firing. It is attempted to ensure For this reason, the tunnel oven 10 according to the present embodiment is configured to include the firing temperature detection device 14.
[0025]
Hereinafter, each configuration of the tunnel oven 10 will be described.
[0026]
First, the oven body 11 will be described.
[0027]
As shown in FIGS. 1 and 2, the oven body 11 has a tunnel structure, and the object to be fired 1 is transported in the oven body 11 from the right to the left in the drawing. In the present embodiment, the oven body 11 is composed of two blocks, a first block 21 and a second block 22, and the firing conditions can be set for each of the blocks 21 and 22. Note that the block of the oven body 11 is not limited to two blocks as in this embodiment, and can be set as appropriate according to the firing conditions of the article to be fired 1.
[0028]
An inlet table 23 into which the object to be fired 1 is placed is provided at the right end of the oven main body 11 in the drawing, and the fired fired object 1 is taken out at the left end of the oven main body 11 in the drawing. An exit table 24 is provided. Further, a viewing hole 32 for confirming the firing state of the object to be fired 1 and an exhaust damper hole 33 for exhausting are formed on the side surface of the oven body 11, and further, at the upper center position of the oven body 11. An exhaust device 34 is provided for exhausting exhaust gas generated by firing. In addition, the conveying apparatus 12, the heating apparatus 13, and the calcination temperature detection apparatus 14 are arrange | positioned at the oven main body 11 comprised as mentioned above.
[0029]
Next, the transport device 12 will be described.
[0030]
The transport device 12 includes a transport conveyor 25, conveyor pulleys 26 and 27, a conveyor motor 28, and the like. The conveyor 25 is stretched between a conveyor pulley 26 disposed on the inlet table 23 and a conveyor pulley 27 disposed on the outlet table 24.
[0031]
Conveyor rollers 93 are disposed on both sides of the conveyor 25 (see FIG. 7), and the conveyor rollers 93 roll on a conveyor guide rail 92 provided in the oven body 11 to thereby convey the conveyor. 25 moves. The conveyor motor 28 is disposed on the outlet table 24 (see FIG. 2), and a belt 29 is stretched between the conveyor motor 28 and the conveyor pulley 27. Therefore, the driving force of the conveyor motor 28 is transmitted to the conveyor pulley 27 via the belt 29, whereby the conveyor 25 moves.
[0032]
The object to be fired 1 is placed in the tray 2 (see FIG. 7) and then mounted on the conveyor 25 on the entrance table 23. And the to-be-baked object 1 is conveyed in the oven main body 11 by the conveyance conveyor 25 driving, a baking process is performed by the heating apparatus 13 mentioned later in the conveyance process, and the to-be-baked object 1 which the baking process complete | finished is exit. The table 24 is taken out from the conveyor 25.
[0033]
Next, the heating device 13 will be described.
[0034]
The heating device 13 is provided in each of the first block 21 and the second block 22 in this embodiment. As shown in FIGS. 2 to 4, the heating device 13 is roughly composed of a lower heating device 30 disposed in the lower part of the conveyance path of the article 1 and an upper heating apparatus disposed in the upper part of the conveyance path. 31.
[0035]
The upper heating device 31 uses a gas burner in this embodiment. From the viewpoint of dealing with environmental problems such as global warming described later, a gas burner that discharges carbon dioxide is not desirable. However, when it is necessary to burn the surface of the article to be fired 1, the heating power is weak, and a heating device other than a gas burner cannot be burned sufficiently. For this reason, in this embodiment, a gas burner is used as the upper heating device 31 in this embodiment. Depending on the firing conditions of the article to be fired 1, it is desirable to use an upper heating device 31 that does not generate carbon dioxide such as an electric heater.
[0036]
The lower heating device 30 includes a heating furnace 35, a fan 36, a fan motor 37, a supply duct 38, a discharge duct 39, a heating duct 40, and the like. The heating furnace 35 has a function of generating hot air for firing the article 1 to be fired. First to third partition walls 41 to 43 are disposed inside the heating furnace 55, whereby a first chamber 47, a second chamber 48, and a third chamber 49 are formed inside the heating furnace 35. Has been.
[0037]
Specifically, a first chamber 47 is formed between the first partition wall 41 and the second partition wall 42, a second chamber 48 is formed between the second partition wall 42 and the side wall 45, and A third chamber 49 is formed between the third partition wall 43 and the upper wall 44, and a heating chamber 50 is formed between the first partition wall 41 and the side wall 46.
[0038]
The fan motor 37 is disposed on the side wall 45. The rotation shaft of the fan motor 37 passes through the side wall 45 and protrudes into the second chamber 48, and the fan 36 is attached to the protruding portion. Therefore, when the fan motor 37 is driven, the fan 36 is directly rotated.
[0039]
Further, an inflow opening 56 is formed in the second partition wall 42 so as to face the fan 36. Therefore, when the fan motor 37 is driven and the fan 36 rotates, the air in the first chamber 47 flows into the second chamber 48 through the inflow opening 56. A plurality of blowing holes 57 are formed in the third partition wall 43 that defines the third chamber 49 and the heating chamber 50. Further, an electric heater 51 is disposed in the heating chamber 50, and the electric heater 51 is disposed at a position facing the blowing hole 57.
[0040]
The supply duct 38 and the discharge duct 39 are disposed on both sides of the heating furnace 35 described above. The supply duct 38 and the discharge duct 39 are disposed so as to extend upward from the heating furnace 35. Further, lower openings 52 and 53 are formed in the lower portions of the ducts 38 and 39, and upper openings 54 and 55 are formed in the upper portions of the ducts 38 and 39.
[0041]
The lower opening 53 formed in the supply duct 38 is configured to open to the lower part of the heating chamber 50. Specifically, it is configured to open at a lower position of the electric heater 51 disposed in the heating chamber 50. The lower opening 52 formed in the discharge duct 39 is configured to open to the first chamber 47 described above. The upper openings 54 and 55 formed in the ducts 38 and 39 are in communication with the heating duct 40.
[0042]
The heating duct 40 is a duct having a hollow flat box shape, and is disposed in the lower part of the conveyance path of the article 1 to be fired. That is, the heating duct 40 is disposed at a lower position of the transport conveyor 25 that transports the object to be fired 1. The hot air generated in the heating furnace 55 is supplied to the heating duct 40 through the supply duct 38 and heats the heating duct 40. The object to be fired 1 is fired by the radiant heat of the heated heating duct 40.
[0043]
Further, the hot air supplied to the heating duct 40 and fired the object to be fired 1 is again returned to the heating furnace 55 via the discharge duct 39. That is, in the present embodiment, the hot air for performing the baking treatment of the object to be fired 1 is configured to circulate in the order of the heating furnace 55 → the supply duct 38 → the heating duct 40 → the discharge duct 39 → the upper opening 55. Hereinafter, the functions of the above-described components will be described in detail in the order in which the hot air flows.
[0044]
The hot air heated in the heating furnace 55 flows into the lower opening 53 of the supply duct 38. The hot air flowing into the lower opening 53 moves up in the supply duct 38 and is supplied into the heating duct 40 from 55.
[0045]
FIG. 4 shows the heating duct 40 in an enlarged manner. 4A is a cross-sectional view of the heating duct 40, and FIG. 4B is a front view of the heating duct 40. FIG. As shown in FIG. 4A, a central partition wall 60 is formed in the center of the inside of the heating duct 40, and side partition walls 61 are formed on both sides of the central partition wall 60, respectively. As a result, hot air passages including the forward path 63 and the return path 64 are formed at both side positions of the central partition wall 60. At this time, in this embodiment, the forward path 63 and the return path 64 are configured to be provided side by side in the surface direction of the heating duct 40 (see FIG. 4B) having a flat box shape.
[0046]
The hot air supplied from the supply duct 38 into the heating duct 40 is guided by the central partition wall 60 and flows into the forward path 63 (the flow of hot air is indicated by a broken line in FIG. 4A). The hot air flowing through the forward path 63 is changed in the flow direction by the outer wall of the heating duct 40 and proceeds into the backward path 64. The hot air flowing in the return path 64 is discharged into the discharge duct 39 from the upper opening 54.
[0047]
As described above, in the present embodiment, since the forward path 63 and the backward path 64 are provided side by side in the surface direction of the heating duct 40, both the forward path 63 and the backward path 64 are opposed to the conveyance path of the article 1 to be fired. It becomes the composition to do. Assuming a configuration in which the forward path and the backward path are overlapped in the vertical direction (vertical direction), only one hot air passage located in the upper part is opposed to the conveying path of the object to be fired and contributes to firing, while the other located in the lower part. This hot air passage does not contribute to the firing, resulting in a decrease in thermal efficiency.
[0048]
On the other hand, in this embodiment, since the forward path 63 and the return path 64 are provided side by side in the surface direction of the heating duct 40, any of the hot air flowing through both the forward path 63 and the return path 64 contributes to the firing of the object 1 to be fired. Will be. As a result, the thermal efficiency is improved, and thus energy saving of the tunnel oven 10 can be achieved.
[0049]
On the other hand, the hot air discharged into the discharge duct 39 from the upper opening 54 moves down in the discharge duct 39 and is discharged from the lower opening 52 to the first chamber 47 of the heating furnace 55 (hereinafter, passing through the heating duct 40). The hot air returned to the heating furnace 55 is called circulating hot air). Although this circulating hot air passes through the inside of the heating duct 40, the temperature is lower than the temperature when it is supplied to the heating duct 40 from the upper opening 55, but it becomes a higher temperature than the normal temperature. ing.
[0050]
The second partition 42, which is one wall constituting the first chamber 47, is formed with the inflow opening 56 as described above, and this inflow opening 56 is configured to face the fan 36. . The fan 36 driven by the fan motor 37 sucks the circulating hot air flowing into the first chamber 47 into the second chamber 48. Further, the circulating hot air hot air sucked by the fan 36 subsequently flows into the third chamber 49.
[0051]
As described above, the third partition wall 43 constituting the third chamber 49 has a plurality of blowing holes 57 formed therein. Therefore, the circulating hot air flowing into the third chamber 49 flows into the heating chamber 50 through the blowout hole 57. At this time, since the electric heater 51 is disposed at a position facing the blowout hole 57 in the heating chamber 50, the circulating hot air blown from the blowout hole 57 is heated by the electric heater 51 and is again fired. Hot air having a temperature sufficient for firing is generated. The hot air generated in this way flows again into the lower opening 53 and is sent out toward the heating duct 40.
[0052]
As described above, in this embodiment, the hot air circulates between the heating furnace 55 that generates the hot air and the heating duct 40 that performs the baking treatment of the object to be fired 1. With this configuration, energy saving of the tunnel oven 10 can be achieved.
[0053]
That is, in this embodiment, the circulating hot air that has returned from the heating duct 40 to the heating furnace 55 is heated. Although the temperature of the circulating hot air is lowered by the firing treatment of the object to be fired 1 as described above, it still has a higher temperature than the room temperature. Therefore, when raising the temperature to the temperature required for firing the object to be fired 1, the temperature of the circulating hot air is higher than that of a configuration in which external ambient temperature air is newly introduced to raise the temperature. The temperature can be raised with less energy. Therefore, energy saving of the tunnel oven 10 can be achieved by adopting the configuration of the present embodiment.
[0054]
Further, in the present embodiment, when the hot air is generated in the heating furnace 55, the electric heater 51 generates hot air. Therefore, the electric heater 51 does not discharge carbon dioxide like the gas heater, and thus in recent years. It can also deal with environmental problems such as global warming.
[0055]
Further, in the present embodiment, since a flat box-shaped heating duct 40 is used to fire the lower part of the article 1 to be fired, unlike the burner (upper heating device 31) that cannot be directly washed, direct washing ( Washing with water). Since the residue generated from the object to be fired 1 usually falls downward from the conveyance path of the object to be fired 1, most of the residue adheres to the lower heating device 30.
[0056]
In particular, in the configuration in which the heating duct 40 is provided in the lower part of the conveyance path of the article to be fired 1 and the firing process is performed by this, most of the residues adhere to the heating duct 40. However, since the heating duct 40 can be directly cleaned as described above, the dropped residue can be reliably cleaned, and thus the tunnel oven 10 in a sanitary baking environment can be realized.
[0057]
Next, the firing temperature detection device 14 will be described.
[0058]
As described above, in order to make the tunnel oven 10 compatible with the HACCP method, it is necessary to attach the temperature sensor 70 to the object 1 and detect the temperature change of the object 1 during the baking process. For this purpose, the tunnel oven 10 is provided with a firing temperature detector 14.
[0059]
5 to 9 are diagrams for explaining the baking temperature detection device 14. The firing temperature detection device 14 is generally composed of a temperature sensor 70, a cable 71, a moving table 72, a guide rail 73, a temperature detection processing device 74, a feeding / winding mechanism 75, a temperature recorder 76, and the like.
[0060]
As shown in FIG. 7, the temperature sensor 70 is attached by being directly inserted into the object to be fired 1, and thus has a pen-like shape. One end of a cable 71 is connected to the temperature sensor 70, and the temperature of the object 1 detected by the temperature sensor 70 is transmitted as a temperature signal via the cable 71.
[0061]
The cable 71 is a cable having a heat-resistant structure, and is configured to be fed into the oven main body 11 via the feeding / winding mechanism 75 when the workpiece 1 is transported by the transport conveyor 25. . The other end of the cable 71 opposite to the side connected to the temperature sensor 70 is configured to be drawn out of the oven body 11. And the edge part of the cable 71 pulled out from this oven main body 11 is connected to the temperature recorder 76 (refer FIG. 6).
[0062]
The temperature recorder 76 calculates and records the temperature of the article 1 based on the temperature signal transmitted from the temperature sensor 70. Further, the temperature data obtained by the temperature recorder 76 is transmitted to the temperature detection processing device 74. As shown in FIG. 6, the temperature detection processing device 74 is provided on the side of the oven main body 11 and includes a display device, a printer, and the like. The temperature data transmitted from the temperature recorder 76 is displayed on a display device provided in the temperature detection processing device 74, and is output from the printer as necessary.
[0063]
As described above, in the present embodiment, since the temperature sensor 70 is directly inserted into the object to be fired 1 and is conveyed along with the object to be fired 1, it is possible to detect a temperature change of the object to be fired 1 during the firing process. Further, since the cable 71 connected to the temperature sensor 70 as described above is pulled out of the oven body 11 and connected to the temperature recorder 76, the temperature signal sent from the temperature sensor 70 is transmitted by the temperature recorder 76. Can be processed immediately. This makes it possible to detect in real time the temperature at which the object to be fired 1 is being fired in real time, and to directly adjust the firing conditions with respect to the current firing state.
[0064]
By the way, in order for the temperature sensor 70 to properly detect the temperature of the object to be fired 1, the temperature sensor 70 is not separated from the object to be fired 1 (so that it is not dropped out) in the process of transporting the object to be fired 1. There is a need. Specifically, the object to be fired 1 is conveyed in the direction indicated by the arrow X1 in FIG. 5, and thus the temperature sensor 70 also moves in the direction of the arrow X1 in the figure, so that a force in the direction of the arrow X2 in the figure acts on the cable 71. It must be configured not to.
[0065]
For this purpose, in this embodiment, the oven main body 11 is provided with a moving table 72 and a feeding / winding mechanism 75. The moving table 72 and the feeding / winding mechanism 75 have a function of feeding the cable 71 in synchronization with the conveyance speed of the article 1 to be fired.
[0066]
First, the moving table 72 will be described. The movable table 72 is configured to include a base 80, a roller 81, an extending arm 82, and an attachment 83 as shown in an enlarged view in FIGS. 7 and 8. The base 80 is a rectangular plate-like body, is mounted on the guide rail 73, and is configured to move by being guided by the guide rail 73 (consisting of the upper rail 90 and the lower rail 91).
[0067]
A roller 81 is disposed on the lower surface of the base 80, and the roller 72 moves on the lower rail 91, so that the moving base 72 can move in the guide rail 73. As shown in FIG. 5, the guide rail 73 is disposed so as to penetrate the oven body 11 from the entrance table 23 to the exit table 24.
[0068]
On the other hand, a fixing member 87 for fixing the cable 71 is provided on the upper surface of the base 80. A predetermined position in the vicinity of the temperature sensor 70 of the cable 71 is fixed to the base 80 by a fixing member 87 through a holder 88 for preventing damage. A sensor holder 89 for holding the temperature sensor 70 when not in use is provided at a predetermined position of the base 80. Therefore, the temperature sensor 70 does not get in the way during the baking process that is not compatible with HACCP.
[0069]
An extension arm 82 is disposed at the center position of the base 80. As shown in FIG. 8, the extending arm 82 extends toward the conveyor 25 from a gap formed between the upper rail 90 and the lower rail 91, and a detachable mechanism 86 is provided at the lower end of the extending arm 82. Is arranged. The attachment / detachment mechanism 86 is configured to attach the attachment 83 in a detachable manner.
[0070]
The attachment 83 includes a rod-shaped arm portion 84 and a magnet portion 85 disposed at the lower end portion of the arm portion 84. The attachment 83 is attached to the extension arm 82 by attaching the upper end portion of the arm portion 84 to the attachment / detachment mechanism 86.
[0071]
In this attached state, the magnet portion 85 provided at the lower end portion of the arm portion 84 is configured to be magnetically joined to the transport conveyor 25. In this embodiment, since the conveyor 25 is made of a magnetic material, the magnet unit 85 can be directly joined to the conveyor 25. However, when the conveyor 25 is made of a non-magnetic material, the magnet It is necessary to dispose a metal plate or the like made of a magnetic material at a position where the portion 85 is joined.
[0072]
When the magnet conveyor 85 is joined to the conveyor 25 as described above, when the conveyor 25 moves, the moving platform 72 moves in the guide rail 73 with the driving force of the conveyor 25 being reduced. At this time, since the moving table 72 is directly joined to the transport conveyor 25 via the extension arm 82, the attaching / detaching mechanism 86, and the attachment 83, the movement of the moving table 72 and the movement of the transport conveyor 25 are synchronized with high accuracy. Can be made. That is, the moving direction and moving speed of the moving table 72 coincide with the moving direction and moving speed of the article to be fired 1 with high accuracy.
[0073]
Thereby, the length of the cable 71 between the temperature sensor 70 and the fixing member 87 is always constant, and the temperature sensor 70 is detached from the baking object 1 between the baking object 1 and the fixing member 87. It is possible to prevent a force from acting on the cable 71. Thereby, even if the to-be-fired thing 1 is conveyed, the temperature sensor 70 does not detach | leave from the to-be-fired object 1, and can improve the reliability of the temperature detection of the to-be-fired object 1.
[0074]
By the way, even if the moving table 72 moves in synchronization with the object to be fired 1, if the cable 71 is not sent into the oven main body 11 in response to the movement of the moving table 72, the temperature sensor 70 is still the object to be fired. There is a possibility of leaving from 1. That is, when the feeding amount of the cable 71 is small with respect to the moving speed of the moving table 72, the moving table 72 is pulled by the cable 71, and the moving speed of the moving table 72 is higher than the conveying speed of the object to be fired 1. May be slow. In this case, the temperature sensor 70 is also detached from the object to be fired 1.
[0075]
The feeding / winding mechanism 75 has a function of preventing the temperature sensor 70 from being detached from the object to be fired 1 by smoothly feeding the cable 71 into the oven body 11 as the moving table 72 moves. In addition to this function, the feed / winding mechanism 75 also has a function of rewinding the cable 71 fed into the oven body 11 after the temperature detection process for the article to be fired 1 is completed.
[0076]
As shown in FIGS. 5 and 6, the feed / winding mechanism 75 includes a winding pulley 95, a clutch device 96, a winding motor 97, a rotary connector 98, and first to third limit switches 100 to 102, and the like. It is configured.
[0077]
The take-up pulley 95 is a pulley that takes up the cable 71 and is disposed on the side surface of the inlet table 23 in this embodiment. As described above, the cable 71 fixed to the moving base 72 is configured to be wound around the winding pulley 95 via each pulley 99. A take-up motor 97 is connected to the spindle of the take-up pulley 95 via a clutch device 96.
[0078]
The clutch device 96 is an electromagnetic clutch and is connected to the temperature detection processing device 74. And according to the instruction | indication of the temperature detection processing apparatus 74, the clutch apparatus 96 is set as the structure which carries out ON / OFF operation | movement. In a state where the clutch device 96 is ON, the take-up pulley 95 is connected to the take-up motor 97, and the take-up pulley 95 is rotated by the driving force of the take-up motor 97. On the other hand, when the clutch device 96 is turned off, the take-up pulley 95 is disconnected from the take-up motor 97, so that the take-up motor 97 becomes rotatable.
[0079]
The take-up motor 97 is a motor that urges the take-up pulley 95 in the direction to take up the cable 71, and is configured to start and stop driving by a drive signal from the temperature detection processing device 74.
[0080]
Further, the cable 71 wound around the take-up pulley 95 and the external cable 77 (connected to the temperature recorder 76, see FIG. 6) are connected by a rotary connector 98. The rotary connector 98 is configured to be electrically connected without rotating the external cable 77 even when the take-up pulley 95 rotates. Therefore, by using the rotary connector 98, the cables 71 and 77 are not twisted even when the take-up pulley 95 rotates, and the cable 71 and the external cable 77 wound around the take-up pulley 95 It is possible to prevent a connection failure from occurring during the operation.
[0081]
The first to third limit switches 100 to 102 are switches for detecting the position of the moving table 72 and are arranged in the vicinity of the guide rail 73 so as to be able to engage with the moving table 72. As shown in FIG. 5, the first limit switch 100 and the third limit switch 102 are disposed on the inlet table 23 side, and the second limit switch 101 is disposed on the outlet table 24 side. . Further, the third limit switch 102 is arranged on the right side (the arrow X1 direction side in the figure) of the first limit switch 100 with respect to the third limit switch 102 in the figure. Each of the limit switches 100 to 102 is connected to a temperature detection processing device 74.
[0082]
Next, the operation of the feeding / winding mechanism 75 will be described. As described above, the take-up motor 97 and the take-up pulley 95 are configured to be connected / disconnected by the clutch device 96, and the load of the take-up motor 97 is applied to the take-up pulley 95 in the released state. The structure is not transmitted. The temperature detection processing device 74 turns off the clutch device 96 when temperature is detected (that is, during firing).
[0083]
Thereby, at the time of temperature detection, the load of the winding motor 97 is not applied to the winding pulley 95. Therefore, even if the moving base 72 moves along with the conveyance of the article 1 to be fired, the movement follows the movement. The cable 71 is smoothly drawn out from the take-up pulley 95. Thereby, the movement of the moving table 72 is not hindered by the cable 71, and thus the temperature sensor 70 can be prevented from being detached from the article 1 to be fired.
[0084]
On the other hand, when the firing process is finished, the object to be fired 1 and the moving table 72 move to the outlet table 24. As a result, the moving table 72 comes into contact with the second limit switch 101, and the temperature detection processing device 74 detects that the baking process has ended. When the end of the firing process is detected, the temperature detection processing device 74 sends a stop signal to the temperature recorder 76, so that the temperature recorder 76 finishes the temperature calculation process and the temperature recording process of the article 1 to be fired. Let
[0085]
In addition, when the firing process is completed, it is necessary to return the moving table 72 that has been advanced to the outlet table 24 to the entrance table 23 and to rewind the fed cable 71 in order to prepare for the next firing process. At this time, since the cable 71 is fixed to the moving table 72, the moving table 72 is automatically returned to the entrance table 23 by winding the cable 71. That is, in the configuration of the present embodiment, the process of returning the movable table 72 can be performed at the same time by winding the cable 71.
[0086]
In order to start the winding process of the cable 71, the temperature sensor 70 is set on the sensor holder 89 of the moving table 72, and the attachment 83 is detached from the moving table 72 by operating the attaching / detaching mechanism 86. Thereby, the movable stand 72 becomes a structure which can move the inside of the guide rail 73 freely.
[0087]
Subsequently, the operator operates a rewind switch (not shown) provided in the temperature detection processing device 74. By this operation, the temperature detection processing device 74 turns on the clutch device 96 to connect the take-up pulley 95 and the take-up motor 97 and activate the take-up motor 97. Thereby, the take-up pulley 95 is rotated by the take-up motor 97, and the cable 71 is taken up by the take-up pulley 95, and the moving table 72 is also moved toward the inlet table 23.
[0088]
The entrance table 23 is provided with a first limit switch 100, and when the movable table 72 operates the first limit switch 100 as the cable 71 is wound, the temperature detection processing device 74 winds the cable 71. Further, it is determined that the movable table 72 has returned to the predetermined position, and the winding motor 97 is stopped. As described above, in this embodiment, the cable 71 is automatically wound up after the firing is completed, and the moving base 72 is automatically returned to the position before the movement start. Processing can be facilitated.
[0089]
In the above-described embodiment, the moving table 72 is moved together with the transfer conveyor 25. However, as long as the moving table 72 can be synchronized with the movement of the transfer conveyor 25, the moving table 72 may be moved in other configurations. It is also possible to provide a unique moving means on the moving table 72.
[0090]
【The invention's effect】
  As described above, according to the present invention, various effects described below can be realized.
  According to the invention described in claim 1, by arranging the forward path and the return path in the surface direction of the heating duct, both hot air flowing in both the forward path and the return path contribute to the firing of the object to be fired, and the thermal efficiency is This can improve the energy saving of the tunnel oven.
[0093]
  Also,Claim 2According to the invention, since the carbon dioxide is not discharged like the gas heater by using the electric heater, it is possible to cope with environmental problems such as global warming which have been a problem in recent years.
[Brief description of the drawings]
FIGS. 1A and 1B show an overall configuration of a tunnel oven according to an embodiment of the present invention, in which FIG. 1A is a plan view and FIG.
FIG. 2 is a cross-sectional view of a tunnel oven that is an embodiment of the present invention.
FIG. 3 is an enlarged cross-sectional view showing a main part of a lower heating device provided in a tunnel oven according to an embodiment of the present invention.
4A and 4B are diagrams for explaining a heating duct provided in a tunnel oven according to an embodiment of the present invention, in which FIG. 4A is a cross-sectional view, and FIG. 4B is a front view.
FIG. 5 is an enlarged plan view showing the vicinity of the entrance table and the vicinity of the exit table of the tunnel oven according to the embodiment of the present invention.
FIG. 6 is an enlarged front view showing the vicinity of the entrance table and the vicinity of the exit table of the tunnel oven according to the embodiment of the present invention.
FIG. 7 is an enlarged perspective view showing a moving table provided in a tunnel oven according to an embodiment of the present invention.
FIG. 8 is a cross-sectional view showing a state in which a moving table is mounted on a conveyor.
FIG. 9 is an enlarged perspective view showing a guide rail.
[Explanation of symbols]
1 Product to be fired
2 trays
10 Tunnel oven
11 Oven body
12 Conveying device
13 Heating device
14 Firing temperature detector
23 Entrance table
24 Exit table
25 Conveyor
28 Conveyor motor
30 Lower heating device
31 Upper heating device
35 Heating furnace
36 fans
37 fan motor
38 Supply duct
39 Exhaust duct
40 Heating duct
50 Heating chamber
51 Electric heater
52, 53 Lower opening
54,55 Upper opening
56 Inlet opening
57 Outlet
60 Central bulkhead
61 Side bulkhead
63 Outbound
64 Return
70 Temperature sensor
71 cable
72 Moving platform
73 Guide rail
74 Temperature detection processing device
75 Feeding / winding mechanism
76 Temperature recorder
82 Extension arm
83 Attachment
85 Magnet part
86 Detachable mechanism
87 Fixing member
88 holder
89 Sensor holder
95 Winding pulley
96 Clutch device
97 Winding motor
98 Rotating connector
100 First limit switch
101 Second limit switch
102 Third limit switch

Claims (2)

In the tunnel oven configured to be baked by a heating device arranged along the transfer path of the object to be baked in the process in which the object to be baked is transferred through the transfer path in the oven body by the transfer device,
The heating device comprises hot air generating means for generating hot air, and a heating duct disposed along a conveyance path of the object to be fired,
The hot air circulated between the hot air generating means and the heating duct so that the hot air generated by the hot air generating means returns to the hot air generating means again through the heating duct,
In addition, a forward path and a return path as the hot air passage are formed in the heating duct, and both the forward path and the return path are provided side by side in the surface direction of the heating duct so as to face the transport path. A tunnel oven characterized by The tunnel oven according to claim 1 ,
The tunnel oven according to claim 1, wherein the hot air generating means includes an electric heater.

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