JPH116017A - Side pusher for side rolling type continuous heating furnace - Google Patents

Abstract

PROBLEM TO BE SOLVED: To execute the positional correction of both of 4 m tube and 5 m tube in the same stroke of a pushing rod. SOLUTION: On the pushing rod 15 for correcting the position by pushing the end surfaces of the cast iron tubes 1a, 1b, a first and a second pushing plates 19, 24 for executing the correcting action, are arranged. The first pushing plate 19 is the one for correcting the position by pushing the 4 m tube 1a, and to the 5 m tube 1b, this plate is turned and retracted by abutting on the side surface, and it gives no trouble to shifting the 5 m tube 1b. Since the second pushing plate 24 is separated from the first pushing plate 19 by the difference between the lengths of both tubes 1a, 1b, this plate pushes the end part of the 5 m tube to execute the positional correction. In such a way, the positional correction of both tubes 1a, 1b can be executed in the same stroke of the pushing rod 15.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a side pusher used for correcting the position of a cast iron pipe in a roll-over type continuous heating annealing furnace for a ductile cast iron pipe.

[0002]

2. Description of the Related Art For example, a ductile cast iron pipe (straight pipe) manufactured by centrifugal casting is commercialized through an annealing process under predetermined conditions after casting. In the annealing, usually, in a rollover type continuous heating annealing furnace, cast iron pipes are arranged in parallel at a constant pitch on a plurality of skid rails laid with a gentle ascending gradient in the transport direction, and the receiving end face is furnace wall. In a state where they are aligned on a line keeping a predetermined distance from, while pressing and rolling two places of each tube with claws protruding at a fixed pitch from an endless double conveyor parallel to the skid rail, at a predetermined speed It is carried out by passing through an annealing furnace (see Examples described later).

At this time, the cast iron pipe is transported while rotating on the skid rail. However, the cast iron pipe in an as-cast state is not always a perfect circle and has a slight bending in the length direction. During this, the end of the cast iron pipe comes in and out, and a so-called meandering state appears.

If this meandering state is left, the tube end collides with the furnace wall, damaging the furnace wall, or the tube coming off the claw of the conveyor, so that the tube cannot be conveyed to a so-called dumpling state, and the annealing furnace cannot be used. It could lead to an accident that could result in For this reason, side pushers are installed at several places on both sides of the furnace, and the press rods are used to press the end face (receiving side or insertion side) of the cast iron pipe to correct the position.

[0005]

By the way, the length of a cast iron pipe is specified by a standard.
4m for 5mm pipe and 100mm diameter pipe, 150m diameter
m is 5m, and the diameter is 100mm for gas pipe.
The above is 5 m. If these 4m pipes and 5m pipes are separately annealed in a single lot, there is no problem. However, if it corresponds to each product supplied from a plurality of casting machines, and if the annealing furnace is used effectively, Annealing of mixed lots of 4m pipe and 5m pipe is inevitable.

In the case where the 4m pipe and the 5m pipe are mixed, if the receiving ends are aligned, 1m enters and exits at the insertion end, but conventionally, it is necessary to correct the position of either pipe having the same stroke and a pipe length difference of 1m. There is no effective side pusher that can be applied, and the worker pushes or pulls the pipe with a hook or the like while visually checking the position of the receiving end from the manhole provided on the furnace wall, By correcting the position, the meandering phenomenon is prevented.

This annealing furnace is under a high temperature, and the position correction of the cast iron pipe by the operator under the high temperature is a severe operation.
Improvement is desired.

Here, a length detecting means for a cast iron pipe is provided,
A side pusher mechanism that detects the length of each tube and selects and presses a stroke according to the detected length is conceivable, but it requires operation of a large-scale facility and a furnace exposed to high temperatures. However, there is also a problem in terms of maintenance.

In view of the above, the present invention provides a roll-type continuous heating furnace in which a plurality of pipes having different lengths, such as a 4 m pipe and a 5 m pipe, are conveyed in a mixed manner, without using a length detecting means. It is an object of the present invention to provide a side pusher that can accurately correct the position of any tube with the same stroke.

[0010]

In order to solve the above-mentioned problems, the present invention focuses on the fact that the shortest pipe requires the longest pressing stroke, and the progress of the side pusher pressing rod is determined. The shortest tube is pressed to correct the stroke, and a fixed stroke is applied.A plate for pressing each end of the tube with a different length is attached to the pressing rod, and the pressing plate is applied to the tube end only for the tube in charge of itself. They came in contact with each other and moved out of the moving area.

The advance of the pressing rod may be performed for all the tubes moving in parallel, or may be performed only for the tubes whose tube ends are shifted. The shift detection may be performed by a person or a sensor. In the course of the pressing rod, each pressing plate corrects the position by pressing the pipe end only for the pipe of the length that it is responsible for. For this reason, even if tubes of different lengths are moving together, the position of the tubes corresponding to them is corrected by one stroke of the pressing rod.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The above-mentioned embodiment of mounting each pressing plate on a pressing rod is such that each pressing plate is positioned at a different length interval of a pipe having a different length in the axial direction of the pressing rod. When the rod advances the above-mentioned constant stroke, a pressing plate abutting on the side surface of each pipe moving in parallel is attached to the pressing rod so as to be rotatable around its axis. It is possible to adopt a configuration in which, when it is in contact with the end and is in contact with the tube side surface, it is pushed to rotate and retreat.

According to this structure, each pressing plate rotates and retreats in accordance with the movement of the tube by contacting the tube not in charge of itself with the side of the tube, so that there is no obstacle to the movement of the tube.
If the pipe has passed, it returns to a state where its own weight can press its own pipe end. The retreat of the pressing plate by this configuration is mechanical, the structure is simple, and there are few failures.

[0014]

FIG. 1 is a schematic plan view of a roll-over type continuous heating and annealing furnace A, FIG. 2 is an enlarged view of a main part thereof, and FIG. 3 is a cut-away side view of FIG. A new side pusher P is provided in the heating furnace A. The roll-over type continuous heating and annealing furnace A is for a diameter of 75 to 150 mm, the inner width of the furnace is 6200 mm, and the reference position of the cast iron tube 1 that rolls in parallel is a position where the receiving end face is 450 mm away from the furnace wall 10. (See FIG. 2).

In this embodiment, a T-shaped tube having a diameter of 75 mm, a 4 m tube 4a having a total length of 4108 mm, and a G-shaped tube having a diameter of 100 mm are used.
Anneal a 5 m tube 1b with a total length of 5125 mm using an MII tube.
The distance between the tube axes of these tubes 1a and 1b (general symbol: 1) is determined by the pitch of the claws 11a of the conveyor 11 (200 m).
m), which in this case is 200 mm, but with a caliber of 1
In the case of a 50 mm tube, the distance is 4
00 mm.

The cast iron pipe 1 in the furnace A has a gentle upward gradient (1/30) between the claws 11a of the transport conveyor 11.
0) The refractory skid rail 12 laid on the bottom of the furnace
It is placed on the upper side, and is transported while being rolled by being pushed from one side of the tube 1 by the claws 11 a by the driving of the two conveyors 11 and 11.

The side pushers P ₁ for the receiving port, which are disposed at two locations on the receiving side (reference position side) of the cast iron tube 1, have a stroke of the pressing rod 13 of 550 mm, and the main body is outside the furnace. The pressing rod 13 is fed into the furnace through a hole in the furnace wall 10, and the pressing surface at the tip of the pressing rod is 10
Stand by at the position of 0 mm. Therefore, the effective stroke in the furnace A is 450 mm, that is, the reference distance from the furnace wall 10 to the receiving end face.

The furnace wall 10 on the side of the insertion port of the cast iron tube 1 has a structure shown in FIG.
A side pusher P _2, which may push back the order of four at a time as shown in the side pusher P is provided according to the present invention. The former side pusher P ₂ is conventionally provided, and the stroke of the pressing rod 14 is 500 mm.
It stands by at a position protruding 200 mm from the furnace wall 10.

The latter is a side pusher P according to the present invention. As shown in FIGS. 5 and 6, a pressing rod 15 projects from the furnace wall 10, and the pressing rod 15 is attached to a moving frame 17 on a rail 16. After being fixed, it is advanced and retracted into the furnace A by the air cylinder 18 at a stroke of 500 mm.

The pressing rod 15 is a 100A steel pipe (100A
The schedule 160) has a water-cooled structure through which water passes, and maintains a distance L of 80 mm between the center axis of the pressing rod 15 and the outermost minimum point of the cast iron pipe 1 (see FIGS. 8 and 9). The tube 1 and the pressing rod 15 do not interfere.

The first pressing plate 19 attached to the tip of the pressing rod 15 is made of a heat-resistant steel (SU) having a thickness of 20 mm as shown in FIG.
S310S), which is formed in an elongated fan shape, has a hole having an inner diameter of 74 mm substantially at the center, and a cylinder 19a made of heat-resistant steel and having the same inner diameter as this hole is fixed to the back by welding. The weight member 20 is fixed to the lower back surface of the pressing plate 19.

The first pressing plate 19 loosely fits the bush 21 into a cylinder 19a connected to the hole of the pressing plate 19, and
5 is fixed to the mounting portion 23 at the tip end with a set screw 22. At this time, since there is play between the bush 21 and the cylinder 19a, the pressing plate 19 is self-standing with the fan-shaped spread portion having the center of gravity downward in the attached state, but if a force is applied from the lateral direction. Rotates in the pressed direction without resistance. At the time of self-standing, the front end of the pressing surface of the first pressing plate 19 protrudes from the pressing rod 15, engages the insertion side of the cast iron pipe 1 by 80 mm, and pushes the pipe insertion end by the advancement of the pressing rod 15.

A flange-shaped second pressing plate 24 having a thickness of 20 mm is fixed to the outer periphery of the pressing rod 15 at a position 1000 mm away from the first pressing plate 19 by welding. In the figure, 2 is a staircase, 3 is a manhole, and 4 is a work passage.

In this side pusher P, the tip of the pressing rod 15 stands by at a distance of 500 mm from the insertion reference position of the 4 mm pipe 1a, and at this time, the second pressing plate 24 is inserted into the 5 mm pipe insertion port. It is located 500 mm away from the reference position (see FIG. 5). In this state, when the cast iron pipe 1 is conveyed on the axis of the side pusher P, the air cylinder 18 is operated, and the pressing rod 1 is moved with a stroke of 500 mm.
5 is sent out toward the insertion end. The operation of the side pusher P may be performed for all the tubes 1,
This may be performed only for the sensor or visual “shift tube 1”.

At this time, the transported pipe 1 is a 4 m pipe 1
In the case of "a", as shown in FIG. 8, the pressing surface of the first pressing plate 19 presses the insertion end and returns to the reference position. On the other hand, in the case of the 5 m pipe 1b, as shown in FIG. 9, the first pressing plate 19 is pushed down on the side surface by the movement of the pipe 1b and rotates, and
Does not hinder the movement of b. For this reason, the second pressing plate 24 pushes the insertion end and pushes it back to the insertion reference position of the 5 m pipe 1b. In this manner, the side pusher P corrects the insertion position by the same movement (with the same stroke) regardless of whether the conveyed pipe 1 is the 4-m pipe 1a or the 5-m pipe 1b.

In this embodiment, there are two types of tube lengths. If there are three or more types, the pressing plates 19 and 24 are attached to the pressing rod 15 at different length intervals, and the foremost pressing plate is provided. The position of the tube of each length can be corrected with a fixed stroke of the pressing rod 15 by fixing the fixing member 24 and making the other rotatable like the pressing plate 19. Further, in the embodiment, the first pressing plate 19 abuts on the 5 m pipe 1b even during standby, but if the space is loosened, the pressing rod 15 may be retracted so as not to abut. At this time, the traveling stroke becomes longer.

The present invention is not limited to annealing, but can be applied to furnaces for various heat treatments such as normalizing, and can be applied to pipes other than cast iron pipes.

[0028]

As described above, according to the present invention, the position of pipes having different lengths such as a 4m pipe and a 5m pipe can be corrected by a single operation irrespective of the pipe length. There is no need to manually correct the position while monitoring,
Labor saving by full automation can be achieved. Further, the worker can be released from the high-temperature work, and the working environment can be improved. Furthermore, it is not necessary to always open the manhole, thereby preventing heat radiation and stably maintaining the furnace temperature.

[Brief description of the drawings]

FIG. 1 is a schematic plan view of a rollover type continuous heating and annealing furnace employing one embodiment.

FIG. 2 is an enlarged view of the main part.

FIG. 3 is a cutaway side view of FIG. 2;

FIG. 4 is a front view of a main part of the cutting in FIG. 2;

FIG. 5 is a cut-away plan view of one embodiment of the side pusher according to the present invention.

FIG. 6 is a cutaway front view of the embodiment.

FIG. 7 is an enlarged view of a main part of the embodiment, in which (a) is a cut front view, and (b) is a right side view.

FIG. 8 is an operation explanatory view, in which (a) is a cut front view,
(B) is a right side view of the same.

FIGS. 9A and 9B are operation explanatory views, wherein FIG.
(B) is a right side view of the same.

[Explanation of symbols]

A side roll type continuous heating and annealing furnace P, P ₁ , P ₂ side pusher 1 cast iron pipe 1a 4m pipe 1b 5m pipe 10 furnace wall 11 transfer conveyor 11a transfer claw 12 skid rail 13, 14, 15 pressing rod 18 air cylinder 19th One pressing plate 24 Second pressing plate

Claims (2)

[Claims] 1. A plurality of tubes 1 having different lengths, such as cast iron tubes.
a, 1b are provided in a furnace A which is continuously heated while being rolled in the parallel direction.
5 into and out of the furnace.
a side pusher for a roll-over type continuous heating furnace that pushes back the ends of 1a and 1b and corrects the parallel position, wherein the advance of the pressing rod 15 is a constant stroke for pressing the shortest tube 1a to correct the position, On the pressing rod 15,
Plates 19 and 24 for pressing the pipe ends of different lengths respectively
A side pusher for a roll-over type continuous heating furnace in which the pressing plate 19 abuts on the tube end only of the tube 1a in charge of itself and withdraws from the moving area for the other tubes 1b. 2. The pressing plates 19 and 24 are located at different distances between the tubes 1a and 1b having different lengths in the axial direction of the pressing rod 15, and the pressing rod 15 performs the predetermined stroke. A pressing plate 19 that abuts against the side surface of each of the tubes 1b that move in parallel when it advances proceeds is rotatably mounted on the pressing rod 15 around its axis, and its tip always abuts on the tube end by its own weight. 2. The side pusher for a roll-over type continuous heating furnace according to claim 1, wherein the pusher is rotated when it comes into contact with the side surface of the tube and retreats.