JPH0212560Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to a push rod for a pusher device that conveys a fired product placed on a pusher type tunnel furnace by pressing a base plate. .

(Prior Art) In this type of tunnel furnace, for example, as shown in FIG. A large number of base plates 5 are arranged on the top surface from the entrance side to the exit side of the tunnel furnace, and on each base plate 5, a sagger 6 containing a workpiece is placed. As shown in FIG. 5, the sagger 6 placed on the base plate 5 is moved along with the base plate 5 by sliding on the hearth plate 4 by a pusher device installed on the inlet side of the furnace. is sequentially pushed toward the outlet side of the furnace. This pusher device includes a drive cylinder 8 in which a piston rod 7 reciprocates within a stroke L, a pusher head 9 on the proximal end side is connected to the piston rod 7, and a push rod 10 on the distal end side is connected to the base plate 5. It is designed so that it comes into contact with the

In this case, in the conventional pusher device, a push rod made of a long metal rod made of stainless steel or the like is attached to the tip of the metal pusher head.

(Problem to be solved by the invention) However, in cases where high-temperature firing is required, the above-mentioned stainless steel rods, etc. can only achieve heat resistance up to about 1100°C, and heat-resistant materials such as special heat-resistant alloys and new ceramics cannot be used. is very expensive to use. In addition, it is difficult to mold the commonly used firebricks, and if they are made long and large, they tend to break easily and have problems in terms of strength against loads, spalling, etc.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a pusher rod for a pusher device that is inexpensive, capable of rapid heating and cooling, and capable of withstanding high temperatures.

(Means for Solving the Problems) The gist of the present invention is to removably connect a plurality of push plates made of refractory material into short plate shapes by means of pins also made of refractory material. This is a push rod for a pusher device for a tunnel furnace, which is an elongated push rod, and has a pusher head provided on the proximal end side of the push rod connected to a piston rod of a drive cylinder, and the forward end side of the push rod presses a conveying tool.

(Embodiment) An embodiment of the present invention will be described below based on the drawings. FIG. 1 is an overall plan view of the push rod 10;
The figure is the same side view, and FIG. 3 is a cross-sectional view taken from FIG. 1. The push rod 10 has each push plate 11 whose tip side that presses the base plate 5 is made of a refractory material such as quartz or alumina.
A, 11B, 11C, 12A, 12B, and 12C, and the base end side where the pusher head 9 connected to the piston rod 7 is provided is constituted by a metal pusher plate 13 made of a stainless steel plate or the like.

In this case, each of the above-mentioned refractory push plates is formed to have the same size and shape as the base plate 5, and the refractory push plates are stacked in two layers, upper and lower, with different levels, and holes are formed in each refractory push plate. Pins 14 and 15 made of a refractory material such as alumina are loosely fitted into the through holes to connect them to each other.

In this embodiment, the upper and lower two-layer push plates 11A and 12
When connecting A to each other, through holes are formed in both push plates, and pins 14 and 15 are loosely fitted into the through holes.

Next, the metal push plate 13 described above is provided with a recess that fits into the protruding upper layer push plate 12C, and
A through hole is bored perpendicular to the recessed portion, and a metal pin 16 is inserted between this through hole and the through hole of the push plate 12C to connect them. Although not shown in the drawings, a fifth
As in the case shown in the figure, a plunger head 9 is provided, and the plunger head 9 is connected to the piston rod 7 and configured to be able to reciprocate within the range of the stroke L by the drive cylinder 8, as is conventional. The same is true.

In this embodiment, in order to facilitate connection with the piston rod 7, the base end of the push rod that moves back and forth outside the furnace was constructed with a metal push plate 14, but this could be replaced with a push plate made of refractory material. The entire push rod may be made of refractory material.

In addition, in this embodiment, in order to prevent the pressing load from each base plate 5 and each sagger 6 storing a workpiece from being applied to each pin 14, 15 when moving the push rod forward, in this embodiment, especially between each pin and the through hole. A gap is provided between the two and it is loosely fitted. Furthermore, the pushing plate made of refractory material may be constructed of a single layer of pushing plates 17 and 18 as shown in FIG.

(Effects of the invention) As is clear from the above embodiments, the following effects can be expected from the push rod in the pusher device according to the invention.

High heat resistance can be obtained by using refractories such as quartz and alumina.

Since the above-mentioned refractories are used for the lining material and base plate of tunnel furnaces, the selection of new materials based on the furnace atmosphere, temperature, etc. can be omitted, and they are easy to obtain and inexpensive.

Due to the removable pin joint structure, the length can be freely adjusted as necessary, and part of it can be reassembled to the desired refractory material depending on the fire resistance, and the part can be replaced even if it is damaged. can be exchanged.

Because of the combined structure of each divided pusher plate, it is easier to mold than an integrally molded refractory, and it also has more strength against loads, spalling, etc.

[Brief explanation of the drawing]

Fig. 1 is a plan view of a push rod according to an embodiment of the present invention, Fig. 2 is a side view of the same, and Fig. 3 is a -
4 is a longitudinal sectional view of the tunnel furnace, FIG. 5 is a side view of the same essential parts, and FIG. 6 is a view of another embodiment showing the joint portion of the push plate. Explanation of symbols, 10...Push rod, 11A, 11
B, 11C, 12A, 12B, 12C... Push plate (made of refractory), 14... Metal push plate, 14,1
5...Pin, 16...Metal pin.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A hearth plate on the rear end side of a base plate on which a sagger containing a workpiece is placed, including a plurality of short plate-shaped push plates each made of refractory material. For a tunnel furnace, the push plates are placed in series along the conveying direction, and each of the push plates is configured to form a long push rod by removably connecting the ends of the adjacent push plates. A push rod in a pusher device. (2) The connecting ends of each of the push plates are overlapped in the shape of a matching joint, and a through hole that communicates with the top and bottom is bored in this overlapping part, and a pin made of refractory material is inserted into the through hole. 2. A push rod in a pusher device for a tunnel furnace according to claim 1, wherein adjacent push plates are removably connected.