JP2004263962A - Carriage type tunnel furnace - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a carriage type tunnel furnace generating no clearance between carriages in a baking method in which a carriage train stays in the furnace over a long time. <P>SOLUTION: This carriage type tunnel furnace has a furnace body having an inlet of the carriage 18 loaded with a baking object on one end, and an outlet of this carriage on the other end, and having at least a preheating zone and a baking zone, a carriage transfer passage laid by penetrating through this furnace body, and a plurality of carriages housed as the carriage train on the transfer passage in the furnace body, and heats-bakes the baking object, and is characterized by having a carriage engaging member 50 for holding so as not to generate the clearance between the carriages when stopping the carriage train. This carriage engaging member is composed of a chain 52 with a roller for pressing the carriage train, and a claw part 55 for hooking-fastening the movement of the carriage train. A press can be a pusher for push-moving the carriage. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a truck type tunnel furnace.
[0002]
[Prior art]
Generally, a tunnel furnace is a long furnace body having an inlet at one end and an outlet at the other end, and includes a pre-tropical zone, a sintering zone, and a cooling zone from the inlet to the outlet. A heating device such as a burner was provided in the high-temperature part and the sintering zone of the pre-tropical zone, and a large number of trucks (hereinafter simply referred to as trolleys or trolley trains) loaded with objects to be fired were laid on the furnace floor. It moves on a transition path (hereinafter also referred to as a rail) from the entrance to the exit. During this time, the object to be fired is preheated in a pre-tropical zone, fired to a predetermined temperature in a firing zone, cooled in a cooling zone, and discharged from an outlet. The carriage is moved by a pusher provided at the entrance.
[0003]
In the bogie type tunnel furnace, there are two types of bogie feeding methods: continuous bogie feeding and intermittent bogie feeding depending on the material to be fired. Usually, it is a continuous bogie feed, and the bogie is moved in the furnace at a constant speed for most of the time, except for a short time for changing bogies.
[0004]
On the other hand, the intermittent truck feed is a method of sending one truck at a time at a short time when changing the truck, and the truck is stopped in the furnace most of the time until the next truck is sent, and the truck is intermittently sent. It is.
[0005]
For example, if the interval (delivery time) between the carriage A and the next carriage B is 60 minutes, in continuous carriage feeding, the distance of one carriage is moved at a constant speed for 60 minutes. Is completed, the pusher is returned to the original position to feed the next bogie B, and the bogie B is furnace-injected and fed at a constant speed. That is, the bogie train in the furnace moves at a constant speed in the furnace except that the pusher stops for a short time when the pusher returns to the original position.
[0006]
However, in the case of the intermittent carriage feed, the carriage A is put into the furnace, and the distance for one car is sent at a stretch in a short time, for example, 30 seconds. For 60 minutes), the bogie train is stopped in the furnace. For example, when firing refractory bricks or red bricks, when the material is index-stacked on a trolley, or when firing a product having a smoking process of smoking without cooling after firing, such as smoked roof tiles In many cases, intermittent carriage feed is used.
[0007]
FIG. 11 is a schematic side view of a partly omitted side view of a bogie type tunnel furnace 10 for firing smoked roof tiles. Reference numeral 11 denotes a furnace main body, which has an entrance 12 and an exit 13 for a truck, and is configured to heat and calcine a material to be calcined in a pre-tropical zone 14 and a calcining zone 15. Here, 16 is a burner provided in the firing zone 15.
[0008]
On the floor of the furnace body 11, a rail 17 for running the truck is laid so as to penetrate the furnace body 11. Here, by moving the plurality of firing carts 18 in the furnace body 11 as a row of carts connected in the traveling direction (the direction of arrow A), the objects to be fired 19 loaded on the firing carts 18 are fired. ing. At the entrance of the tunnel furnace 10, a pusher 20 is provided, and the pusher 20 presses the projection 21 of the last firing cart 18 a, so that the front end edge of each firing cart 18 is connected to the front firing cart 18. The pressing force is sequentially transmitted by contacting the trailing edge.
[0009]
As shown in FIGS. 6 and 7, the trolley for firing has a car top portion 33 made of a refractory brick or a fire-resistant heat insulating material on the upper surface side of a steel trolley frame 32 provided with wheels 31 at a lower portion. A superstructure 34 made of a refractory material is placed on a car top 33, and an object to be fired (for example, a tile) 19 is loaded on the superstructure 34 and can be moved.
[0010]
A first abutment portion 37 made of a heat-resistant seal such as glass wool or asbestos is provided at one edge of the truck directly below the car top 33, and a first abutment portion of another truck is provided at the opposite edge. The convex second contact portions 38 that are in contact with the one contact portion are provided over the entire width of the bogie, respectively. When the contact portions are in close contact with each other, hot air in the furnace flows into the lower portion of the bogie. It is designed to prevent that. FIG. 8 is an enlarged schematic cross-sectional view of the first contact portion 37. The first contact portion has a shape in which a concave portion 34 is formed at an edge portion by a steel angle or the like and a sealing material 35 such as asbestos is attached. is there. FIG. 9 is an enlarged schematic cross-sectional view of the second contact portion 38, in which a rod 36 is fixed to an edge portion to form a convex second contact portion. FIG. 10 shows a contact state between the first contact portion and the second contact portion. The convex second contact portion is in contact with the deformable first contact portion, deforms and fits the sealing material by a pressing force, and has a structure in which a heat flow in a vertical direction of the bogie is blocked.
[0011]
Further, around the bogie frame, a receiving portion 39 of the smoked capsule is provided in a frame shape and inclined forward and backward. The receiving portion 39 of the capsule is filled with a sealing material 40 made of asbestos or the like in order to prevent outside air from entering the capsule when the capsule is covered.
[0012]
At both left and right side edges of the truck 18, shielding plates 41 are provided directly below the car top 33 over the entire length of the truck. On the other hand, in the tunnel furnace main body 11, receiving troughs 42 extend from the inlet to the outlet on both left and right sides of the furnace wall 22, and the receiving trough 42 is filled with a seal sand 43. When the truck 18 is inserted into the tunnel furnace body 11, the tip of the shield plate 41 sinks into the seal sand 43 and moves in the furnace. It can be prevented from flowing into the lower part of the bogie from the part.
[0013]
Projections 21, 21 'are attached to the lower center of the bogie frame 32. The front protrusion 21 'is a pulling portion of the puller when the bogie is to be discharged from the furnace, and the rear protruding portion 21 is a pressing portion for entering the furnace and pressing with the pusher.
[0014]
The upper part of the bogie is a high-temperature portion of the firing zone, and in the case of a roof tile, the temperature becomes 1150 to 1200 ° C. On the other hand, as shown in FIGS. 1 and 2, air is injected into the center of the hearth at the lower part of the bogie to cool the bogie to 150 ° C. to 200 ° C. As shown in FIG. 1, air is blown from a blower (not shown) through a main pipe 23 and a branch pipe 24 branched at an appropriate distance from the main pipe 23, and is blown from a blowout port 25 provided in the hearth almost in parallel with the hearth. It is blown off as indicated by arrow C to cool the lower part of the truck.
[0015]
In the bogie type tunnel furnace configured as described above, continuous bogie feeding is performed in the following procedure.
[0016]
First, the exit door 13 'is opened, the truck 18d at the most exit portion is pulled by a puller (not shown), and the furnace is fired, and the exit door 13' is closed. Next, the pusher 20 at the entrance is returned, the entrance door 12 'is opened, and a new bogie (not shown) is fed into the furnace. The entrance door 12 'is closed, and the bogie newly inserted into the furnace is pressed by a pusher and moved at a predetermined speed in the direction of the outlet.
[0017]
In the case of intermittent carriage feed, the following procedure is performed. If there is no bogie in the furnace Z at the entrance, the entrance door 12 'is opened and a new bogie is charged into the furnace. Next, the exit door 13 'is opened, and the newly loaded cart is quickly sent by the pusher 20 toward the exit by one car. Since the bogie train moves by one car in the exit direction, the bogie 18d at the most exit portion is pushed out of the furnace. The extruded cart 18d at the outermost exit is pulled by a puller to completely discharge the furnace. Then, the exit door 13 'is closed, the pusher 20 at the entrance is returned to the predetermined position, and the bogie train in the furnace is kept stopped for a predetermined time.
[0018]
However, in this intermittent bogie feed, when the bogie row is being pushed by the pusher, the bogie rows are in contact with each other at the leading edge and the trailing edge, but when the pusher is returned, the bogie row is pushed. Since the pressure is released, each truck moves slightly, and a gap is generated between the trucks. Since the temperature inside the furnace on the trolley is close to 1200 ° C., heat enters the lower part through the gap between the trolleys and melts the steel bogie frame, or the cooling air below the trolley flows into the furnace. There is a problem that the thermal efficiency of firing is reduced and the quality of the object to be fired is adversely affected. However, there is no known truck type tunnel furnace that solves such a problem.
[0019]
[Problems to be solved by the invention]
The present invention is an invention relating to an improvement of a bogie type tunnel furnace made in view of the above circumstances. An object of the present invention is to provide a bogie type tunnel furnace in which no gaps are formed between bogies in a firing method in which bogie trains stop and stay in the furnace for a long time.
[0020]
[Means for Solving the Problems]
In order to solve the above problems, the present inventors have come to the conclusion that while the train of trucks is stopped in the furnace for a long time, it is sufficient to apply a pressing force to the train of trucks so that the train of trucks does not move.
[0021]
That is, the bogie type tunnel furnace of the present invention comprises a furnace body having at least one pre-tropical zone and a baking zone, having at one end an inlet of the bogie loaded with the object to be fired, and at the other end having an outlet of the bogie. In a bogie type tunnel furnace for heating and firing an object to be fired having a bogie-type transition path of a bogie penetrated therethrough and a plurality of bogies housed as a bogie row on the transition path in the furnace body, stopping the bogie row It is characterized by having a trolley contact means for holding the trolley so that no gap is sometimes generated between the trolleys.
[0022]
The carriage contacting means is constituted by a pressing means for pressing the carriage row and a restraining means for restraining the movement of the carriage row, and the pressing means may be a pusher for pushing and moving the carriage.
[0023]
Further, the restraining means of the present invention is a means for restraining the movement of the bogie train by engaging an engaging member fixed to the floor of the furnace main body with an engaged portion fixed to each bogie. It is desirable that The engaged portion fixed for each truck can be a protrusion attached to the rear of the truck that the tip pressing portion of the pusher abuts.
[0024]
[Action]
The bogie type tunnel furnace of the present invention is configured such that the bogie at the most entrance portion of the bogie row is pressed by a pusher, and an engaging member is fixed near the outlet on the floor surface of the furnace main body, so that the bogie row at the most outermost portion is formed. By engaging the bogie row so as not to move to the exit side by engaging with the engaged portion of the bogie, a force can always be applied between the pusher and the engaging member. Therefore, the first abutment portion and the second abutment portion of each truck come into contact with each other and come into close contact with each other, so that no gap is generated between the trucks. Therefore, heat enters the lower part of the trolley through the gap between the trolleys and melts the steel trolley frame, cooling air under the trolley flows into the furnace, lowering the thermal efficiency, or the quality of the material to be fired. Can be prevented.
[0025]
【Example】
Hereinafter, an embodiment of the present invention will be described with reference to FIGS.
[0026]
FIG. 1 is an explanatory partial side view showing an example of the restraining means of the present invention, and shows an exit side of a tunnel furnace 10. FIG. 2 is a schematic plan view of FIG. Parts similar to those in FIG. 11, such as the furnace body 11 and the bogie 18, are denoted by the same reference numerals and description thereof is omitted.
[0027]
Here, the bogie train is pressed in the direction of arrow A by a pusher (not shown). The bogie 18 (e) is the bogie closest to the outlet 13 of the furnace body 11, and the engaged portion 21 engages with an engaging member 50 fixedly provided on the floor of the furnace to restrict the movement of the bogie train. Stopped.
[0028]
FIG. 3 is a partially cut-away side view schematically illustrating the relationship between the engaged portion 21 of the carriage 18 and the engaging member 50. In FIG. 3, the engagement member 50 is raised by the engagement / detachment device 51 and is in an engaged state with the carriage 18. The engagement / detachment device 51 has a configuration in which a lifting roller 53 is fixed to a roller chain 52. When the chain 52 is moved in the direction of the arrow X, the push-up roller 53 is also moved in the direction of the arrow X and no longer supports the engaging member 50. Can be disengaged from the engaged portion 21. On the other hand, when engaging with the engaged portion 21 of the bogie 18 from the disengaged state, the chain 52 is moved in the arrow Y direction, and the push-up roller 53 is moved to the slope 56 of the claw 55 of the engagement member 50. The engaging member 50 is raised to a predetermined position by moving the engaging member 50 along the moving direction. Thus, for example, after the cart 18 (e) of FIG. 1 is removed from the furnace, the engaging member 50 can be engaged with the engaged portion 21 of the cart 18 (f).
[0029]
FIG. 4 is a front view illustrating the shape of the chain 52 with rollers, and FIG. 5 is a front view illustrating the shape of the push-up rollers 53.
[0030]
The chain 52 is housed in a channel 60 laid on the floor of the furnace main body 11 and is integrally continuous via gears 61 and 61 '. The gear 61 is connected via a shaft portion 63 to a driving device 62 installed at a distance from the furnace main body 11. The driving device 62 is an air cylinder in the present embodiment, and converts the reciprocating motion of the cylinder rod into the rotating motion of the gear 61 connected to the shaft portion 63 as shown by an arrow D, thereby pushing up on the chain 52. The rollers 53 can be moved.
[0031]
In the truck tunnel furnace of the present invention configured as described above, the truck can be sent intermittently by the following procedure.
[0032]
If there is no bogie in the furnace at the entrance (space Z in FIG. 11), a new bogie is put into the furnace. Return the pusher 20 to the home position. The engaging member 50 engaging the outermost carriage (for example, 18e in FIG. 1) is released (the push-up roller 53 is moved to the X direction). The exit door 13 'is opened. The bogie newly entering the furnace by the pusher 20 is rapidly sent by one bogie. Since the entire bogie train moves to the exit side by one bogie, the bogie 18e almost exits the furnace. By operating the engaging member 50 (by moving the chain 52 in the Y direction), the pusher 20 presses the train of bogies so as to engage the next bogie next to the outermost exit (for example, the bogie 18f in FIG. 1). The engaged portion 21 of the truck 18f engages with the claw portion 55 of the engaging member 50, and the bogie train stops. The pusher 20 maintains the pressed state. At this time, the pressing force of the pusher may be reduced to such an extent that there is no gap between the carts in the cart row. The trolley 18e that has gone outside is completely fired with a puller and the exit door 13 'is closed.
[0033]
When the smoked roof tile was fired by the truck type tunnel furnace of the present example, the temperature of the truck frame was 340 ° C. Further, the bogie frame was hardly damaged. On the other hand, in the firing in the conventional method under the same firing conditions, the temperature of the bogie frame rose to 620 ° C. That is, it can be seen that the close contact means of the present invention greatly contributes to the temperature reduction of the bogie frame. The temperature was measured at a point P in FIG. 6 immediately below the contact portion at the edge of the bogie.
[0034]
The present invention is not limited to the above-described embodiment. For example, various modifications can be made to the shape and fixing method of the engaging member and the method of engaging with the bogie. It is needless to say that the present invention can be appropriately changed and implemented without departing from the scope of the present invention.
[0035]
【The invention's effect】
The bogie type tunnel furnace of the present invention is provided with an engaging member on the hearth near the exit so that the bogie row does not move to the exit side by engaging with the engaged portion of the bogie at the most exit portion of the bogie row. Since the force can always be applied between the pusher and the engaging member while being locked, no gap is generated between the bogies. Therefore, heat enters the lower part from the gap between the front and rear edges of the bogie to melt down the steel bogie frame, or the cooling air under the bogie flows into the furnace to reduce the thermal efficiency of the furnace, or In addition, it is possible to prevent the occurrence of a problem such as adversely affecting the quality of the object to be fired. Therefore, the bogie type tunnel furnace of the present invention has a great effect on improving the thermal efficiency of the furnace, improving the product yield, and further reducing the repair cost of the bogie.
[Brief description of the drawings]
FIG. 1 is a partial side view for explaining a main part of a bogie type tunnel furnace of the present invention.
FIG. 2 is a schematic plan view illustrating a main part of the bogie type tunnel furnace of the present invention.
FIG. 3 is a partially cut-away side view schematically illustrating a relationship between an engaged portion and an engaging member of a truck.
FIG. 4 is an explanatory front view showing the shape of a chain with rollers.
FIG. 5 is an explanatory front view showing the shape of a push-up roller.
FIG. 6 is a schematic side view showing a shape of a truck.
FIG. 7 is a schematic front view showing the shape of a cart.
FIG. 8 is a schematic sectional view showing an outline of a first contact portion of the bogie.
FIG. 9 is a schematic cross-sectional view illustrating an outline of a second contact portion of the bogie.
FIG. 10 is a schematic sectional view showing a contact state between a first contact portion and a second contact portion.
FIG. 11 is a partially omitted schematic side view showing an example of a bogie type tunnel furnace.
[Explanation of symbols]
10: Bogie type tunnel furnace 11: Furnace body 12: Inlet 13: Outlet 14: Pre-tropical 15: Firing zone 16: Burner 17: Transition path (rail) 18: Bogie 19: Workpiece 20: Pusher 21: Projection 23 : Main pipe (blowing) 25: Air outlet 32: Bogie frame 33: Car top 34: Superstructure 37: First contact portion 38: Second contact portion 39 Seal frame of capsule 41: Shielding plate 42: Receiving trough 43: Seal sand 50: Engaging member 52: Chain with roller 53: Push-up roller 61: Gear 62: Drive unit (air cylinder) 63: Shaft

Claims (5)

A furnace body having at least one pre-tropical zone and a sintering zone having an entrance of the bogie loaded with the object to be fired at one end and an exit of the bogie at the other end
A transition path for the bogie laid through the furnace body;
A plurality of bogies housed as a bogie row on the transition path in the furnace body,
A bogie type tunnel furnace for heating and firing the object to be fired,
A bogie type tunnel furnace characterized by having bogie contact means for holding the bogie row so that no gap is formed between the bogies when the bogie train is stopped. The bogie type tunnel furnace according to claim 1, wherein the bogie contact means comprises a pressing means for pressing the bogie row and a restraining means for restraining movement of the bogie row. The bogie type tunnel furnace according to claim 1 or 2, wherein the pressing means is a pusher that presses and moves the bogie. The restraining means is means for restraining the movement of the bogie train by engaging an engaging member fixedly provided on a floor portion of the furnace main body with an engaged portion provided for each bogie. The bogie type tunnel furnace according to claim 2. The bogie type tunnel furnace according to claim 4, wherein the engaged portion is a protruding portion that presses the bogie with the pusher.

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