JPH0555795B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a cart-type tunnel furnace, and in particular to a cart-type tunnel furnace in which the output of a heating means is adjusted according to the required amount of heat of an object to be fired. Regarding furnaces.

(Prior Art) Conventionally, a cart-type tunnel furnace has been known as a continuous kiln with good production efficiency, in which operations such as charging, preheating, firing, cooling, and unloading from the kiln are performed continuously in one tunnel furnace. Generally, tunnel furnaces are operated continuously day and night and for long periods of time. As a result, the workload has been adjusted by reducing the amount of kiln filling at night and on holidays due to the number of workers. Furthermore, when the number of objects (products) of the same type to be fired is small, the type and number of objects to be fired loaded on each trolley are changed for firing.

In the firing area of such a trolley-type tunnel furnace, heating means such as burners are arranged on the side wall in the longitudinal direction of the furnace, and the output of the burners is adjusted according to the firing heat schedule to set the firing conditions. .

(Problem to be Solved by the Invention) The amount of heat required to fire the object to be fired placed on a trolley in a tunnel furnace varies depending on the weight of the object to be fired, including the trolley, shelf assembly, etc. If the shape and quantity of the objects to be fired are always constant, the burner opening degree is set constant according to the set heat schedule.

However, according to the conventional trolley-type tunnel furnace, the output of the heating means that heats the object to be fired in the firing area of the tunnel furnace is set based on a preset heat schedule, and the output of the heating means that heats the object to be fired in the firing area of the tunnel furnace is set based on a preset heat schedule, and the output of the heating means that heats the object to be fired in the firing area of the tunnel furnace is set based on a preset heat schedule. Fine adjustments were made by workers manually adjusting the burner control valve or control valve. As a result, firing tends to continue under certain conditions, especially when there is a shortage of manpower such as at night or on holidays, and it is difficult to satisfactorily adjust the flame temperature to suit the quantity and shape of the objects to be fired. When the amount of objects to be fired is small or the product is thin, the object to be fired may be over-fired, and conversely, if the amount of objects to be fired is large or the product is thick, under-firing may occur. As a result, there was a problem that the quality of the product as the object to be fired became non-uniform.

The present invention has been made to solve these problems, and provides a trolley-type tunnel furnace that automatically adjusts the output of heating means for the object to be fired depending on the weight of the object to be fired. The purpose is to

(Means for Solving the Problems) To achieve this, the cart-type tunnel furnace of the present invention includes a heating means for heating a furnace chamber, a cart for carrying an object to be fired and moving within the furnace chamber, and a weight of the object to be fired. a weight detection means for detecting the weight of the trolley, a carrying means provided at the furnace entrance for transporting the carriage into the furnace chamber, and a feed detection means for detecting the position of the carriage carried into the furnace chamber by the carrying means; a control means for controlling the output of the heating means based on a detected weight signal of the weight detecting means and a detected trolley position signal of the feed detecting means; and a control valve for adjusting the output of the heating means in accordance with a command from the control means. ,
It is characterized by having the following.

(Function) According to the cart-type tunnel furnace of the present invention, when the object to be fired, which is placed on the cart pushed from the entrance of the tunnel furnace by a carrying means such as a pusher, comes to the firing area, the weight of the object to be fired is adjusted according to the weight of the object to be fired. Since the amount of heat is applied, the degree of firing of the object to be fired can be adjusted appropriately, so there is no over-firing or under-firing, preventing cracking and uneven coloring of the product, and achieving uniform high quality. It is possible to obtain objects (products) to be fired.

(Example) Hereinafter, an example of the present invention will be described based on the drawings.

In the tunnel furnace according to the embodiment of the present invention, as shown in FIG. 3, the furnace body 1 is composed of a preheating zone 1a, a firing zone 1b, and a cooling zone 1c, and has a passage 7 extending linearly inside the furnace. A cart 10 passes through this passage 7.

A rail 9 is laid on the floor surface 8 of the passage 7 formed inside the furnace body 1, and a cart 10 runs on this rail 9.
are continuously moved from the furnace inlet part 1d toward the furnace outlet part 1e. A to-be-fired object 12 to be fired is placed on the cart 10 . The time required for the carriage 10 to pass through the passage 7 is set depending on the type of object to be fired and the length of the kiln, and is, for example, 15 to 60 hours. On the side wall of the furnace body 1 in the firing area, a large number of burners 3, 4, 5, 6, etc. as heating means are arranged in the furnace length direction.

As shown in FIG. 1, a pusher 14 is provided at the entrance portion 1d of the furnace body 1 as a carry-in means for pushing out the cart 10. On the pusher 14, there is a device for detecting the position of the cart 10. A feed detection means 15 is provided. The feed detection means 15 is
For example, it consists of a limit switch, and this limit switch serves as a position detection means for the rod 14a of the pusher 14.

In the middle of the fuel gas supply passages 20, 21, 22 that supply fuel and air to the burners 3, 4, 5,
Solenoid valves 23, 24, 25 are provided for switching on/off of the burners 3, 4, 5, and the opening and closing of these solenoid valves 23, 24, 25 is controlled by a control means 16.
This is done under the direction of. In addition, the output of the burners 3, 4, 5 is determined by the settings of the output control valves 29, 30, 3 by the valve opening setting devices 26, 27, 28.
1 adjusts.

The control means 16 calculates the time taken for the cart 10 to pass through the burners 3, 4, and 5 after being carried into the furnace based on the cart position signal from the feed detection means 15, and also calculates the time taken for the cart 10 to pass through the burners 3, 4, and 5 after being carried into the furnace. The flame level and temperature of burners 3, 4, 5, etc. are controlled accordingly.

Next, the operation will be explained.

The position of the carriage 10 passing through the passage 7 of the tunnel furnace is detected by the control means 16 based on a signal from the feed detection means 15. Further, the weight of the object to be fired 12 placed on the trolley 10 is determined in advance by the weight measuring means 35.
The measured weight signal is measured by the control means 1.
Sent to 6.

The burners 3, 4, and 5 are turned on and off by electromagnetic valves 23, 24, and 25 depending on the weight of the object to be fired that comes to the burners 3, 4, and 5 in the firing area.
The switching of the solenoid valves 23, 24, 25 is performed by the control means 1.
The solenoid valves 23, 24, and 25 perform this operation according to the signal from 6.

For example, if the weight of the object to be fired that has arrived at the burners 3, 4, and 5 is relatively light, as shown in FIG. Open and turn on burners 3 and 5. Further, when the weight of the object to be fired is relatively large, the outputs of the burners 3, 4, and 5 are all turned on so that the output corresponds to the amount of heat required by the object to be fired.
Further, the output of the burners 3, 4, and 5 can be manually adjusted using valve opening setting devices 26, 27, and 28.

In this way, in this embodiment, the combustion output can be adjusted according to the weight of the object to be fired that has come to a position near the burner, so the degree of firing of the object to be fired can be adjusted appropriately. It is possible to prevent unevenness and make the quality of the product uniform. The burner may be installed anywhere, such as on the side wall or ceiling of the furnace body.

Further, in the embodiment described above, the output of the burners 3, 4, and 5 was switched in two stages, on and off, but in the present invention, the output control valve is automatically controlled by a command from the control means according to the weight of the object to be fired. It may be adjusted.

(Effects of the Invention) As explained above, according to the present invention, the combustion output in the firing zone is adjusted according to the weight of each object to be fired that is placed on a plurality of carts that successively pass through a tunnel furnace. This allows for proper firing according to the weight of the object to be fired, eliminates over-firing and under-firing, prevents product cracking and color unevenness, and provides a homogeneous product with little variation in baked quality. There is an effect that it can be done.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram showing an embodiment of the present invention, FIG. 2 is a schematic vertical cross-sectional view showing a furnace body of a bogie type tunnel furnace according to an embodiment of the present invention, and FIG. 3 is a bogie-type tunnel furnace according to an embodiment of the present invention. 1 is a schematic cross-sectional view showing a furnace body of a type tunnel furnace. 1d... Furnace inlet, 3, 4, 5... Burner (heating means), 7... Passage (furnace chamber), 10... Cart, 1
2...Object to be fired, 14...Putsha (carrying means),
15... Feed detection means, 16... Control means, 2
3, 24, 25... Solenoid valve (control valve), 35...
Weight measurement means (weight detection means).

Claims (1)

[Scope of Claims] 1. A heating means for heating a furnace chamber, a trolley on which an object to be fired is placed and moved within the furnace chamber, a weight detecting means for detecting the weight of the object to be fired, and a means for moving the trolley into the furnace chamber. a carrying means provided at the furnace entrance for conveyance; a feeding detecting means for detecting the position of the trolley carried into the furnace chamber by the carrying means; and a detected weight signal of the weight detecting means and a detection weight signal of the feeding detecting means. A trolley-type tunnel furnace comprising: a control means for controlling the output of the heating means based on a detected trolley position signal; and a control valve for adjusting the output of the heating means according to a command from the control means.