JPS5814488B2 - Automatic control method for material charging and rolling machine of pusher-type billet heating furnace - Google Patents

Description

Detailed Description of the Invention The present invention accurately detects the position of the steel billet in the heating furnace and transfers the steel billet to the fork of the extractor in an optimal condition, thereby improving the fork itself and the extraction machine. The present invention relates to a method for automatically controlling the material charging and extraction machine of a steel billet heating furnace in which the structural size of the side table is made as small as possible.

Conventionally, in billet heating furnaces, in order to transfer the billet to the extraction fork, a position control device has often been attached to the charging machine itself, which has the drawback of increasing equipment costs.

The present invention focuses on these conventional drawbacks, and by accurately determining the position of the steel pieces in the heating furnace and transferring them to the extractor fork in an optimal condition, the structural improvements of the extractor fork and exit table are improved. This invention is designed to minimize its size.Next, this invention will be described in detail with reference to the drawings showing one embodiment thereof.

In the drawing, steel billets Sn that are sequentially fed into an entry roller table 1 are charged into a billet heating furnace 3 by a charging machine 2 when a charging command is applied.

The charged steel billet Sn is already in the skid 4 in the heating furnace 3.
It comes into contact with the steel pieces S1, S2, etc. charged above and moves them forward.

When the front end steel billet S1 in the furnace comes to the position of the billet detector 5 installed on the exit side of the furnace, the tip of the billet is detected by the detector 5, a stop command is issued, and the charging machine 2 starts. Stop.

At this time, the distance from when the stop command is issued until the steel billet advances a little due to inertia and stops, that is, the stop error value PS, is counted by the charging machine side pulse generator 6, and the extraction machine 7 on the heating furnace output side is stopped. Command as error value.

On the other hand, the tip of the fork 7' of the extractor 7 should be stopped at a distance L (standard value is a distance of 150 mm) from the rear end of the steel piece, that is, L (150 mm).
If more than 65% of the width of the billet is placed on the fork, stable movement can be achieved, and if the tip of the fork enters the furnace due to the width of the billet that is continuously charged, it will move to the next billet. This is to prevent the tip of the fork from coming into contact with each other and cause an obstacle during extraction, and to shorten the distance the extractor travels forward and backward.
Therefore, cycle time is shortened.

Using this distance L as a reference value of 150 m7IL, the extractor 7 is set as a stop position and the pulse generator 8 on the extractor side commands the forward distance of the extractor.

On the output side of the heating furnace, a calculator 8' calculates the distance D between the tip of the extractor 7 and the billet stop position, the billet width b set by the computer, and the stop error value P from the billet stop position.
From S, extractor forward distance = {(D-L) + (b-PS)
} (However, if b>1500, b2 is set to 1500.

), the extractor 7 is advanced while counting the forward distance by the extractor-side pulse generator 8, and when it reaches a predetermined position, a forward stop command is issued and the extractor 7 is stopped.

Subsequently, the extractor fork 7' is automatically moved two-dimensionally as shown in FIG. 3 to complete the extraction of the steel pieces.

In addition, in the figure, 9 is an exit roller table for placing and sending out the steel pieces extracted by the extractor 7, and 10 is a running rail for making the extractor 7 run.

In this way, conventional equipment can be used without attaching a position control device to the charging machine, the size of the extractor outlet equipment can be minimized, and the charging amount of the extractor fork can be optimized. due to overcharging.

That is, it is possible to prevent fatigue due to thermal effects and shorten cycle time.

Further, the present invention can be easily applied to a pusher set or a chute type extractor.

As described above, according to the method for automatically controlling the material charging and extraction machine of a steel billet heating furnace of the present invention, the position of the steel billets in the heating furnace is accurately determined and transferred to the extraction machine fork in an optimal condition. This provides the various effects mentioned above, such as the ability to minimize the structural size of the extractor fork and the outlet table.

[Brief explanation of drawings]

FIG. 1 is a schematic side view of an example of an apparatus for carrying out the automatic control method for material charging and extractor of a steel billet heating furnace according to the present invention, FIG. 2 is a partial plan view of FIG. 1, and FIG. 2 is an explanatory diagram of the operation of the extractor fork shown in FIG. 1. FIG. S, S1...Sn is a steel billet, 2 is a charging machine, 3 is a heating furnace,
5 is a billet detector, 6 is a charging machine side pulse generator, 7
is an extractor, 8 is a pulse generator on the extractor side, and 8' is an arithmetic unit.

Claims (1)

[Claims] 1. Charge the steel billets using the charging machine installed on the inlet side of the billet heating furnace, detect the front end of the billet in the furnace with the billet tip detector installed on the outlet side of the furnace, and use the detection command to detect the front end of the billet in the furnace. The charging machine is stopped, and the pulse generator on the charging machine side counts and detects the stop error value until the billet stops after the stop command is given, and the extractor installed on the heating furnace outlet side moves forward by the stop error value. The extractor is moved forward under count control by a pulse generator on the extractor side, and the extractor fork is automatically moved two-dimensionally at the stop position of the extractor to extract the steel pieces. A method for automatically controlling the material charging and extraction machine of a pusher set steel billet heating furnace characterized by the following.